Patent Publication Number: US-11026550-B2

Title: Surface cleaning apparatus, cyclonic air treatment member and surface cleaning apparatus including the same

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation-in-part of U.S. patent application Ser. No. 16/447,308, filed on Jun. 20, 2019, which itself is a continuation-in-part of U.S. patent application Ser. No. 16/254,918, filed on Jan. 23, 2019, the entirety of which is incorporated herein by reference. 
    
    
     FIELD 
     This application relates to the field of cyclonic air treatment members and surface cleaning apparatus including the same. 
     INTRODUCTION 
     The following is not an admission that anything discussed below is part of the prior art or part of the common general knowledge of a person skilled in the art. 
     Various types of surface cleaning apparatus are known, including upright surface cleaning apparatus, canister surface cleaning apparatus, stick surface cleaning apparatus, central vacuum systems, and hand carriable surface cleaning apparatus such as hand vacuums. Further, various designs for cyclonic hand vacuum cleaners, including battery operated cyclonic hand vacuum cleaners, are known in the art. 
     SUMMARY 
     This summary is intended to introduce the reader to the more detailed description that follows and not to limit or define any claimed or as yet unclaimed invention. One or more inventions may reside in any combination or sub-combination of the elements or process steps disclosed in any part of this document including its claims and figures. 
     In accordance with one broad aspect of this disclosure, which may be used by itself or any other aspect set out herein, a moveable member may be positioned in the air treatment chamber, such as a cyclone. The moveable member may comprise a porous member (such as a screen or shroud) and/or a cleaning member, wherein the cleaning member is positioned between a longitudinally extending outer sidewall of the air treatment chamber and a sidewall of the porous member. A handle may be drivingly connected to the moveable member by a driving linkage wherein part of the driving linkage extends through a longitudinally extending slot in the longitudinally extending outer sidewall. In this configuration, the moveable member is longitudinally translatable through at least a portion of the chamber by a handle that is positioned exterior to the air treatment chamber. Accordingly, a screen or other porous air outlet member may be cleaned without a user inserting their hand into the air treatment member. 
     In accordance with this broad aspect, there is provided a surface cleaning apparatus comprising:
         (a) an air flow path extending from a dirty air inlet to a clean air outlet;   (b) an air treatment member having an air treatment chamber positioned in the air flow path, the air treatment chamber comprising an air treatment chamber air inlet, an air treatment chamber air outlet, an openable first end, a longitudinally spaced apart second end having the air treatment chamber air outlet_ and a longitudinally extending sidewall, the sidewall having a longitudinally extending slot, wherein the air treatment chamber air outlet comprises a longitudinally extending porous member having a longitudinally extending porous sidewall;   (c) a suction motor positioned in the air flow path upstream of the clean air outlet;   (d) a moveable member positioned in the air treatment chamber, the moveable member comprising at least one of the porous member and a cleaning member positioned in the air treatment chamber between the sidewall of the air treatment chamber and the porous sidewall; and,   (e) a handle that is drivingly connected to the moveable member by a driving linkage and part of the driving linkage extends through the slot whereby the moveable member is longitudinally translatable through at least a portion of the chamber.       

     In some embodiments, the moveable member may be moveable from an operating position in which the moveable member is positioned towards the second end and a cleaned position in which the moveable member is translated longitudinally away from the second end. 
     In some embodiments, in the cleaned position, at least a portion of the moveable member is exterior of the air treatment chamber. 
     In some embodiments, the moveable member comprises the cleaning member and the cleaning member may be moveable from an operating position in which the cleaning member abuts the second end and a cleaned position in which the moveable member is translated longitudinally away from the second end. 
     In some embodiments, the cleaning member may comprise an annular member. 
     In some embodiments, the air treatment member may comprise a cyclone having a centrally positioned cyclone axis of rotation. 
     In some embodiments, the porous member may be tapered towards the openable first end. 
     In some embodiments, the surface cleaning apparatus may further comprise a dirt collection chamber external to the air treatment member chamber and the air treatment member chamber has a dirt outlet in communication with the dirt collection chamber, wherein air rotates in a direction of rotation in the air treatment chamber and the slot may be positioned in the sidewall in the direction of rotation downstream from the dirt outlet. 
     In some embodiments, the slot may be positioned in the sidewall in the direction of rotation up to 90° downstream from the dirt outlet. 
     In some embodiments, the first end may be openable in response to the moveable member being longitudinally translatable through the chamber. 
     In some embodiments, the surface cleaning apparatus may further comprise an openable lock operable between a locked position in which the first end is secured in a closed position and an open position in which the first end is moveable to an open position and the lock may be moveable from the locked position to the open position in response to the moveable member being longitudinally translatable through the chamber. 
     In some embodiments, the driving linkage may operably engage the lock to move the lock from the locked position to the open position as the moveable member is longitudinally translated through the chamber. 
     In some embodiments, the driving linkage may comprise a longitudinally extending drive rod. 
     In some embodiments, the driving linkage may operably engage the first end to open the first end as the moveable member is longitudinally translated through the chamber. 
     In some embodiments, the moveable member may operably engage the lock to move the lock from the locked position to the open position as the moveable member is longitudinally translated through the chamber. 
     In some embodiments, the slot may have a first longitudinally extending side and a second longitudinally extending side that is spaced from and faces the first longitudinally extending side, wherein the driving linkage may have a portion that travels longitudinally through the slot between the first and second longitudinally extending sides, wherein the first longitudinally extending side meets an inner surface of the sidewall of the air treatment chamber at a first juncture and the first juncture is angled or chamfered. 
     In some embodiments, the slot has a first longitudinally extending side and a second longitudinally extending side that is spaced from and faces the first longitudinally extending side, wherein the driving linkage has a portion that travels longitudinally through the slot between the first and second longitudinally extending sides, wherein a sealing member is positioned between the first and second longitudinally extending sides. Alternately, or in addition, the sealing member may be placed exterior to the air treatment chamber adjacent the slot (e.g., on an outer wall of the air treatment member adjacent the slot). The sealing member may comprise a deformable member that may be provided on at least one of the first and second longitudinally extending sides or on an outer wall of the air treatment member. 
     In some embodiments, the air treatment member may be removably mounted to the surface cleaning apparatus and the sealing member may be provided on the surface cleaning apparatus and is removably received in the slot when the air treatment member is mounted on the surface cleaning apparatus. For example, the sealing member comprises a spline. 
     In accordance with another broad aspect of this disclosure, which may be used by itself or any other aspect set out herein, a moveable member is positioned in an air treatment chamber, and a handle may be drivingly connected to the moveable member by a driving linkage wherein part of the driving linkage extends through an opening in an end wall of the air treatment member. In this configuration, the moveable member is longitudinally translatable axially through at least a portion of the air treatment chamber be using the handle to move the driving linkage axially through the end wall of the air treatment chamber. Accordingly, an end of the air treatment chamber opposed to the end wall may be openable and the axial movement of the handle may push dirt out the open end. 
     In accordance with this broad aspect, there is provided a surface cleaning apparatus comprising:
         (a) an air flow path extending from a dirty air inlet to a clean air outlet;   (b) an air treatment member having an air treatment chamber positioned in the air flow path, the air treatment chamber comprising an air treatment chamber air inlet, an air treatment chamber air outlet, an openable first end, a longitudinally spaced apart second end having the air treatment chamber air outlet and a longitudinally extending sidewall, wherein the air treatment chamber air outlet comprises a longitudinally extending porous member having a longitudinally extending porous sidewall;   (c) a suction motor positioned in the air flow path upstream of the clean air outlet;   (d) a moveable member positioned in the air treatment chamber, the moveable member comprising at least one of the porous member and a cleaning member positioned in the air treatment chamber between the sidewall of the air treatment chamber and the porous sidewall; and,   (e) a handle that is drivingly connected to the moveable member by a driving linkage and part of the driving linkage extends through the opening in the second end whereby the moveable member is longitudinally translatable through at least a portion of the chamber.       

     In some embodiments, the moveable member may be moveable from an operating position in which the moveable member is positioned towards the second end and a cleaned position in which the moveable member is translated longitudinally away from the second end. 
     In some embodiments, in the cleaned position, at least a portion of the moveable member may be exterior of the air treatment chamber. 
     In some embodiments, the moveable member may comprise the cleaning member and the cleaning member may be moveable from an operating position in which the cleaning member abuts the second end and a cleaned position in which the moveable member is translated longitudinally away from the second end. 
     In some embodiments, the cleaning member may comprise an annular member. 
     In some embodiments, the air treatment member may comprise a cyclone having a centrally positioned cyclone axis of rotation. 
     In some embodiments, the porous member may be tapered towards the openable first end. 
     In some embodiments, the surface cleaning apparatus may further comprise a dirt collection chamber external to the air treatment member chamber and the air treatment member chamber may have a dirt outlet in communication with the dirt collection chamber. 
     In some embodiments, the first end may be openable in response to the moveable member being longitudinally translatable through the chamber. 
     In some embodiments, the surface cleaning apparatus may further comprise an openable lock operable between a locked position in which the first end is secured in a closed position and an open position in which the first end is moveable to an open position and the lock may be moveable from the locked position to the open position in response to the moveable member being longitudinally translatable through the chamber. 
     In some embodiments, the driving linkage may operably engage the lock to move the lock from the locked position to the open position as the moveable member is longitudinally translated through the chamber. 
     In some embodiments, the driving linkage may comprise a longitudinally extending drive rod. 
     In some embodiments, the driving linkage may operably engage the first end to open the first end as the moveable member is longitudinally translated through the chamber. 
     In some embodiments, the moveable member may operably engage the lock to move the lock from the locked position to the open position as the moveable member is longitudinally translated through the chamber. 
     In some embodiments, the driving linkage may have a portion that travels longitudinally through the opening, wherein a sealing member is associated with the opening. The sealing member may comprises a deformable member provided in or adjacent the opening. 
     In accordance with another broad aspect of this disclosure, which may be used by itself or any other aspect set out herein, a moveable member (e.g., a cleaning member or a porous air outlet member) is positioned in an air treatment chamber, and a driving assembly, comprising a handle and a driving linkage, is drivingly connected to the moveable member. The driving assembly is reconfigurable between a stored position, and an operable position. In the operating position, the driving assembly is operable to longitudinally translate the moveable member through at least a portion of the air treatment member. When not in use, the driving assembly, e.g., the handle, may be moved to the stored position in which a portion of the driving assembly, e.g., the handle, is positioned to avoid being hit by a user or furniture during use of the surface cleaning apparatus. Therefore, this reduces the likelihood of the driving assembly being damaged when the surface cleaning apparatus is used to clean a surface. 
     In accordance with this broad aspect, there is provided a surface cleaning apparatus comprising:
         (a) an air flow path extending from a dirty air inlet to a clean air outlet;   (b) an air treatment member having an air treatment chamber positioned in the air flow path, the air treatment chamber comprising an air treatment chamber air inlet, an air treatment chamber air outlet, an openable first end, a longitudinally spaced apart second end having the air treatment chamber air outlet and a longitudinally extending sidewall, wherein the air treatment chamber air outlet comprises a longitudinally extending porous member having a longitudinally extending porous sidewall;   (c) a suction motor positioned in the air flow path upstream of the clean air outlet;   (d) a moveable member positioned in the air treatment chamber, the moveable member comprising at least one of the porous member and a cleaning member positioned in the air treatment chamber between the sidewall of the air treatment chamber and the porous sidewall; and,   (e) a driving assembly comprising a handle and a driving linkage wherein the driving assembly is reconfigurable between a stored position and an operable position in which the driving assembly is operable to longitudinally translate the moveable member through at least a portion of the chamber.       

     In some embodiments, the driving linkage may comprise an extendable member wherein, in the stored position, the extendable member is in a contracted configuration and, in the operable position, the extendable member is in an extended configuration in which the handle is operable to longitudinally translate the moveable member through at least a portion of the chamber. 
     In some embodiments, driving linkage may be drivingly connected to the moveable member when the extendable member is in the contracted configuration. 
     In some embodiments, the extendable member may comprise a telescoping drive rod. 
     In some embodiments, the extendable member may comprise a rotatably mounted drive rod, the rotatably mounted drive rod has a longitudinal axis and the rotatably mounted drive rod may be rotatably mounted about an axis that extends in a plane that is transverse to the longitudinal axis of the drive rod. 
     In some embodiments, the driving linkage may comprise a longitudinally translatable drive rod and the rotatably mounted drive rod may be rotatably mounted to the longitudinally translatable drive rod. 
     In some embodiments, a portion of the driving linkage may be exterior to the air treatment chamber and in the stored position, the portion of the driving linkage may be recessed against a portion of the surface cleaning apparatus. 
     In some embodiments, in the stored position, the portion of the driving linkage may be coextensive with a portion of the air treatment member. 
     In some embodiments, the extendable member may be exterior to the air treatment chamber and in the contracted configuration, the extendable member may be recessed against a portion of the surface cleaning apparatus. 
     In some embodiments, in the contracted configuration, the extendable member may be coextensive with a portion of the air treatment member. 
     In some embodiments, the extendable member may have the handle and, in the extended configuration, the handle may be longitudinally spaced from the first and second ends of the air treatment chamber. 
     In some embodiments, the handle may be rotatably mounted and in the stored position, the handle may be recessed against a portion of the surface cleaning apparatus and in the operable position the may be is positioned away from the portion of the surface cleaning apparatus. 
     In some embodiments, in the stored position, the handle may abut the portion of the surface cleaning apparatus. 
     In some embodiments, the driving linkage may comprise a longitudinally extending drive rod having a drive rod axis and the handle may be rotatable about the drive rod axis. 
     In some embodiments, the surface cleaning apparatus may further comprise a stop member operably engageable with the driving assembly to inhibit the driving assembly moving to the operable position. 
     In some embodiments, the moveable member may be moveable from an operating position in which the moveable member is positioned towards the second end and a cleaned position in which the moveable member is translated longitudinally away from the second end. 
     In some embodiments, in the cleaned position, at least a portion of the moveable member may be exterior of the air treatment chamber. 
     In some embodiments, the moveable member may comprise the cleaning member and the cleaning member may be moveable from an operating position in which the cleaning member abuts the second end and a cleaned position in which the moveable member is translated longitudinally away from the second end. 
     In some embodiments, the cleaning member may comprise an annular member. 
     In some embodiments, the air treatment member may comprise a cyclone having a centrally positioned cyclone axis of rotation. 
     In accordance with another broad aspect of this disclosure, which may be used by itself or any other aspect set out herein, a moveable member (e.g., a cleaning member or a porous air outlet member) is positioned in an air treatment chamber, and a driving assembly comprising a handle and a driving linkage is connected to the moveable member. The driving assembly is operable between a stored position, in which the surface cleaning apparatus is operable to clean a surface, and a cleaned position, in which the moveable member has been translated through at least a portion of the chamber. In the stored position, a portion of the driving assembly comprising the handle is longitudinally spaced from the first and second ends of the air treatment chamber and is located adjacent another portion of the surface cleaning apparatus, such as a dirt chamber or motor housing. This reduces the likelihood of the driving assembly being damaged when the surface cleaning apparatus is used to clean a surface. 
     In accordance with this broad aspect, there is provided a surface cleaning apparatus comprising:
         (a) an air flow path extending from a dirty air inlet to a clean air outlet;   (b) a first air treatment member having an air treatment chamber positioned in the air flow path, the air treatment chamber comprising an air treatment chamber air inlet, an air treatment chamber air outlet, an openable first end, a longitudinally spaced apart second end having the air treatment chamber air outlet and a longitudinally extending sidewall, wherein the air treatment chamber air outlet comprises a longitudinally extending porous member having a longitudinally extending porous sidewall;   (c) a suction motor positioned in the air flow path upstream of the clean air outlet;   (d) a moveable member positioned in the air treatment chamber, the moveable member comprising at least one of the porous member and a cleaning member positioned in the air treatment chamber between the sidewall of the air treatment chamber and the porous sidewall; and,   (e) a driving assembly comprising a handle and a driving linkage wherein the driving assembly is operable between a stored position in which the surface cleaning apparatus is operable to clean a surface and a cleaned position in which the moveable member has been translated through at least a portion of the chamber, wherein, in the stored position, a portion of the driving assembly comprising the handle is longitudinally spaced from the first and second ends of the air treatment chamber.       

     In some embodiments, the driving linkage may comprise a drive rod and, in the stored position, at least a portion of the drive rod may extend along another portion of the surface cleaning apparatus. 
     In some embodiments, the surface cleaning apparatus may further comprise a dirt collection chamber exterior to the air treatment chamber, the air treatment chamber may further comprise a dirt outlet in communication with the portion of the drive rod that is coextensive with a portion of the dirt collection chamber that is longitudinally spaced from the first and second ends of the air treatment chamber. 
     In some embodiments, the surface cleaning apparatus may further comprise a second stage air treatment member downstream from the first air treatment member and another portion of the surface cleaning apparatus may comprise the second stage air treatment member. 
     In some embodiments, the first air treatment member may be a first cyclonic stage and the surface cleaning apparatus may further comprise a second cyclonic stage downstream from the first cyclonic stage and the another portion of the surface cleaning apparatus may comprise the second cyclonic stage. 
     In some embodiments, the surface cleaning apparatus may further comprise a suction motor housing and another portion of the surface cleaning apparatus may comprise the suction motor housing. 
     In some embodiments, the driving linkage may have a fixed longitudinal length. 
     In some embodiments, the driving assembly may be reconfigurable between the stored position in which the handle is recessed against a portion of the surface cleaning apparatus and an operable position in which the handle has been rotated away from the portion of the surface cleaning apparatus and the driving assembly is operable to longitudinally translate the moveable member through at least a portion of the chamber. 
     In some embodiments, the stored position, the handle may abut the portion of the surface cleaning apparatus. 
     In some embodiments, the driving linkage may comprise a longitudinally extending drive rod having a drive rod axis and the handle is rotatable about the drive rod axis. 
     In some embodiments, the surface cleaning apparatus may further comprise a stop member operably engageable with the driving assembly to inhibit the handle rotating away from the stored position. 
     In some embodiments, the driving linkage may comprise an extendable member wherein, in the stored position, the extendable member is in a contracted configuration and, in the operable position, the extendable member is in an extended configuration in which the handle is operable to longitudinally translate the moveable member through at least a portion of the chamber. 
     In some embodiments, the driving linkage may be drivingly connected to the moveable member when the extendable member is in the contracted configuration. 
     In some embodiments, the extendable member may comprise a telescoping drive rod. 
     In some embodiments, the moveable member may be moveable from an operating position in which the moveable member is positioned towards the second end and a cleaned position in which the moveable member is translated longitudinally away from the second end. 
     In some embodiments, in the cleaned position, at least a portion of the moveable member may be exterior of the air treatment chamber. 
     In some embodiments, the moveable member may comprise the cleaning member and the cleaning member may be moveable from an operating position in which the cleaning member abuts the second end and a cleaned position in which the moveable member is translated longitudinally away from the second end. 
     In some embodiments, the cleaning member may comprise an annular member. 
     In some embodiments, the air treatment member may comprise a cyclone having a centrally positioned cyclone axis of rotation. 
     In accordance with another broad aspect of this disclosure, which may be used by itself or any other aspect set out herein, a moveable member (e.g., a cleaning member or a porous air outlet member) is positioned in an air treatment chamber, and a handle is drivingly connected to the moveable member. The moveable member is longitudinally translatable through at least a portion of the chamber and the first end of the air treatment member is openable in response to the moveable member being longitudinally translatable through at least the portion of the chamber. Accordingly, the air treatment member may be automatically opened when, e.g., a cleaning member, is used to clean an outlet screen of the air treatment chamber. 
     In accordance with this broad aspect, there is provided a surface cleaning apparatus comprising:
         (a) an air flow path extending from a dirty air inlet to a clean air outlet;   (b) an air treatment member having an air treatment chamber positioned in the air flow path, the air treatment chamber comprising an air treatment chamber air inlet, an air treatment chamber air outlet, an openable first end, a longitudinally spaced apart second end having the air treatment chamber air outlet and a longitudinally extending sidewall, wherein the air treatment chamber air outlet comprises a longitudinally extending porous member having a longitudinally extending porous sidewall;   (c) a suction motor positioned in the air flow path upstream of the clean air outlet;   (d) a moveable member positioned in the air treatment chamber, the moveable member comprising at least one of the porous member and a cleaning member positioned in the air treatment chamber between the sidewall of the air treatment chamber and the porous sidewall, wherein the moveable member is moveable from an operating position in which the moveable member is positioned towards the second end and a cleaned position in which the moveable member is translated longitudinally away from the second end; and,   (e) a handle drivingly connected to the moveable member whereby the moveable member is longitudinally translatable through at least a portion of the chamber,   wherein the first end is openable in response to the moveable member being longitudinally translatable through at least the portion of the chamber.       

     In some embodiments, the surface cleaning apparatus may further comprise an openable lock operable between a locked position in which the first end is secured in a closed position and an open position in which the first end is moveable to an open position, and the lock may be moveable from the locked position to the open position in response to the moveable member being longitudinally translatable through at least the portion of the chamber. 
     In some embodiments, the driving linkage may operably engage the lock to move the lock from the locked position to the open position as the moveable member is longitudinally translated through at least the portion of the chamber. 
     In some embodiments, the driving linkage may comprise a longitudinally extending drive rod. 
     In some embodiments, the driving linkage may operably engage the first end to open the first end as the moveable member is longitudinally translated through the chamber. 
     In some embodiments, the driving linkage may operably engage the first end to open the first end as the moveable member is longitudinally translated through at least the portion of the chamber. 
     In some embodiments, the moveable member may comprise the cleaning member and the cleaning member may operably engage the first end to open the first end as the cleaning member is longitudinally translated through at least the portion of the chamber. 
     In some embodiments, the moveable member may comprise the porous member and the porous member may operably engage the first end to open the first end as the porous member is longitudinally translated through at least the portion of the chamber. 
     In some embodiments, the moveable member may comprise the cleaning member and the cleaning member may operably engage the lock to move the lock from the locked position to the open position as the cleaning member is longitudinally translated through at least the portion of the chamber. 
     In some embodiments, the cleaning member may operably engage the first end to open the first end as the cleaning member is longitudinally translated through at least the portion of the chamber. 
     In some embodiments, the moveable member may comprise the porous member and the porous member may operably engage the lock to move the lock from the locked position to the open position as the porous member is longitudinally translated through at least the portion of the chamber. 
     In some embodiments, the porous member may operably engage the first end to open the first end as the porous member is longitudinally translated through at least the portion of the chamber. 
     In some embodiments, in the cleaned position, at least a portion of the moveable member may be exterior of the air treatment chamber. 
     In some embodiments, the moveable member may comprise the cleaning member and the cleaning member may be moveable from an operating position in which the cleaning member abuts the second end and a cleaned position in which the moveable member is translated longitudinally away from the second end. 
     In some embodiments, the cleaning member may comprise an annular member. Optionally the annular member may have a plurality of finger members depending longitudinally therefrom. Optionally, the finger members may depend from a radially outward portion of the annular member. 
     In some embodiments, the air treatment member may comprise a cyclone having a centrally positioned cyclone axis of rotation. 
     In some embodiments, the porous member may be tapered towards the openable first end. 
     It will be appreciated by a person skilled in the art that an apparatus or method disclosed herein may embody any one or more of the features contained herein and that the features may be used in any particular combination or sub-combination. 
     These and other aspects and features of various embodiments will be described in greater detail below. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       For a better understanding of the described embodiments and to show more clearly how they may be carried into effect, reference will now be made, by way of example, to the accompanying drawings in which: 
         FIG. 1  is a perspective view of a surface cleaning apparatus in accordance with an embodiment; 
         FIG. 2  is a cross-sectional view taken along line  2 - 2  in  FIG. 1 ; 
         FIG. 3  is a perspective view of a surface cleaning apparatus in accordance with an embodiment; 
         FIG. 4  is a cross-sectional view taken along line  4 - 4  in  FIG. 3 ; 
         FIG. 5  is a perspective view of an air treatment member in an open position, in accordance with an embodiment; 
         FIG. 6  is a cross-sectional view taken along line  6 - 6  in  FIG. 5 ; 
         FIG. 7  is a cross-sectional view taken along line  6 - 6  in  FIG. 5 , in accordance with another embodiment; 
         FIG. 8  is a cross-sectional view taken along line  6 - 6  in  FIG. 5 , in accordance with another embodiment; 
         FIG. 9  is a cross-sectional view taken along line  6 - 6  in  FIG. 5 , in accordance with another embodiment; 
         FIG. 10  is a cross-sectional view of an air treatment member, in a closed position, in accordance with another embodiment; 
         FIG. 11  is a cross-sectional view of the air treatment member of  FIG. 10 , in an open position; 
         FIG. 12  is a cross-sectional view of the air treatment member of  FIG. 10 , in an open position, with a cyclone outlet passage removed in accordance with an embodiment; 
         FIG. 13  is a cross-sectional view of the air treatment member of  FIG. 10 , in an open position, with the cyclone outlet passage translated in accordance with an embodiment; 
         FIG. 14  is a perspective view of an air treatment member in an open position, in accordance with an embodiment; 
         FIG. 15  is a perspective view of an air treatment member in an open position and with the cyclone outlet passage rotated out of a cyclone chamber, in accordance with an embodiment; 
         FIG. 16  is a perspective view of an air treatment member in an open position with the cyclone outlet passage rotated out of the cyclone chamber and an open end door in accordance with an embodiment; 
         FIG. 17  is a perspective view of the air treatment member of  FIG. 16  with a closed sidewall and an open end door in accordance with an embodiment; 
         FIG. 18  is a perspective view of an air treatment member in an open position with an open end door in accordance with an embodiment; 
         FIG. 19  is a perspective view of an air treatment member with a sidewall portion opened slightly; 
         FIG. 20  is a perspective view of the air treatment member of  FIG. 19  with the sidewall portion opened fully; 
         FIG. 21  is a perspective view of the air treatment member of  FIG. 19  with the sidewall portion opened fully and an axially extending member rotated; 
         FIG. 22  is a perspective view of an air treatment member in an open position in accordance with an embodiment; 
         FIG. 23  is a perspective view of an air treatment member in an open position and with an open end door in accordance with an embodiment; 
         FIG. 24  is a perspective view of the air treatment member of  FIG. 22  in the open position and with open end doors; 
         FIG. 25  is a perspective view of an air treatment member in an open position in accordance with an embodiment; 
         FIG. 26  is a perspective view of the air treatment member of  FIG. 25  in the open position with the cyclone outlet passage rotated out of the cyclone chamber; 
         FIGS. 27-30  are perspective views of the air treatment member transitioning from a closed position in  FIG. 27  to an open position in  FIG. 30 , in accordance with an embodiment; 
         FIG. 31  is a perspective view of an air treatment member with an axially translatable sidewall portion, in an open position, in accordance with an embodiment; 
         FIG. 32  is a perspective view of the air treatment member of  FIG. 31  with the sidewall portion in a closed position and an open end wall; 
         FIG. 33  is a perspective view of the air treatment member of  FIG. 31  in an open position with the cyclone outlet passage rotated out of the cyclone chamber in accordance with an embodiment; 
         FIG. 34  is a perspective view of an air treatment member in an open position in accordance with an embodiment; 
         FIG. 35  is a perspective view of an air treatment member in accordance with an embodiment; 
         FIG. 36  is a cross-sectional view of the air treatment member of  FIG. 35  taken along the section line  36 - 36 ′ in  FIG. 35 ; 
         FIG. 37  is a cross-sectional view of the air treatment member of  FIG. 35  taken along the section line  37 - 37 ′ in  FIG. 35 , in accordance with some embodiments; 
         FIG. 38  is a cross-sectional view of the air treatment member of  FIG. 35  along the section line  36 - 36 ′, in accordance with another embodiment; 
         FIG. 39  is a perspective cross-sectional view of the air treatment member of  FIG. 35  taken along section line  37 - 37 ′ in  FIG. 35 , in accordance with the embodiment of  FIG. 38 ; 
         FIG. 40  is a perspective view of the air treatment member of  FIG. 38  with an open end wall, in accordance with some embodiments; 
         FIG. 41  is a perspective cross-sectional view of the air treatment member of  FIG. 40  taken along the section line  41 - 41 ′ in  FIG. 40 ; 
         FIG. 42  is a cross-sectional view of the air treatment member of  FIG. 39  taken along the section line  42 - 42 ′, according to some embodiments; 
         FIG. 43  is a sectional perspective of view of the air treatment member of  FIG. 35  taken along the section line  43 - 43 ′ of  FIG. 35 ; 
         FIGS. 44A-44H  are cross-sectional views of the air treatment member of  FIG. 39  taken along the section line  42 - 42 ′ in  FIG. 39 , according to various different embodiments; 
         FIG. 45  is a cross-sectional view of the air treatment member of  FIG. 35  taken along the section line  36 - 36 ′ in  FIG. 35 , in accordance with another embodiment; 
         FIG. 46  is a cross-sectional view of the air treatment member of  FIG. 35  taken along the section line  36 - 36 ′ in  FIG. 35 , in accordance with another embodiment; 
         FIG. 47  is a cross-sectional view of the air treatment member of  FIG. 35  taken along the section line  36 - 36 ′ in  FIG. 35 , in accordance with another embodiment; 
         FIG. 48  is a perspective cross-sectional view of the air treatment member of  FIG. 37  taken along the section line  36 - 36 ′ in  FIG. 35  showing an opened end wall; 
         FIG. 49  is a cross-sectional view of the air treatment member of  FIG. 35  taken along the section line  37 - 37 ′ in  FIG. 35 , in accordance with an embodiment; 
         FIG. 50  is a cross-sectional view of the air treatment member of  FIG. 35  taken along the section line  37 - 37 ′ in  FIG. 35 , in accordance with another embodiment; 
         FIG. 51  is a cross-sectional view of the air treatment member of  FIG. 35  taken along the section line  36 - 36 ′ in  FIG. 35 , in accordance with an embodiment; 
         FIGS. 52-57  are cross-sectional views of the air treatment member of  FIG. 51  taken along the section line  52 - 52 ′ in  FIG. 51 , in accordance with various different embodiments; 
         FIG. 58  is a perspective cross-sectional view of the air treatment member of  FIG. 35  taken along the section line  36 - 36 ′ in  FIG. 35 , in accordance with some embodiments; 
         FIG. 59  is a cross-sectional view of the air treatment member of  FIG. 49  taken along the section line  59 - 59 ′; 
         FIG. 60  is a perspective cross-sectional view of the air treatment member of  FIG. 35  taken along the section line  37 - 37 ′ in  FIG. 35 , according to some embodiments; 
         FIG. 61  is a perspective cross-sectional view of the air treatment member of  FIG. 35  taken along the section line  37 - 37 ′ in  FIG. 35 , according to some embodiments; 
         FIG. 62  is a cross-sectional view of the air treatment member of  FIG. 35  taken along the section line  37 - 37 ′ in  FIG. 35 , according to some embodiments; 
         FIG. 63  is a cross-sectional view of the air treatment member of  FIG. 35  taken along the sectional line  36 - 36 ′ in  FIG. 35  showing an opened end wall, in accordance with some embodiments; 
         FIGS. 64-67  are perspective views of vertical screens, according to various different embodiments; 
         FIG. 68A  is a perspective view of a vertical screen, according to another embodiment; 
         FIG. 68B  is a top-down view of the vertical screen of  FIG. 68A ; 
         FIG. 68C  is a side-view of the vertical screen of  FIG. 68A ; 
         FIG. 69A  is a perspective view of a vertical screen, according to another embodiment; 
         FIG. 69B  is a top-down view of the vertical screen of  FIG. 69A ; 
         FIG. 69C  is a side-view of the vertical screen of  FIG. 69A ; 
         FIG. 70A  is a perspective view of a vertical screen, according to another embodiment; 
         FIG. 70B  is a top-down view of the vertical screen of  FIG. 70A ; 
         FIG. 70C  is a side-view of the vertical screen of  FIG. 70A ; 
         FIG. 71A  is a perspective view of a vertical screen, according to another embodiment; 
         FIG. 71B  is a top-down view of the vertical screen of  FIG. 71A ; 
         FIG. 71C  is a side-view of the vertical screen of  FIG. 71A ; 
         FIG. 72A  is a perspective view of vertical screens, according to another embodiment; 
         FIG. 72B  is a top-down view of the vertical screens of  FIG. 72A ; 
         FIG. 72C  is a side-view of the vertical screens of  FIG. 72A ; 
         FIG. 73A  is a perspective view of vertical screens, according to another embodiment; 
         FIG. 73B  is a top-down view of the vertical screens of  FIG. 73B ; 
         FIG. 73C  is a side-view of the vertical screens of  FIG. 73C ; 
         FIG. 74A  is a perspective view of a vertical screen, according to another embodiment; 
         FIG. 74B  is a top-down view of the vertical screen of  FIG. 74A ; 
         FIG. 74C  is a side-view of the vertical screen of  FIG. 74A ; 
         FIG. 75A  is a perspective view of vertical screens, according to another embodiment; 
         FIG. 75B  is a top-down view of the vertical screens of  FIG. 75A ; 
         FIG. 75C  is a side-view of the vertical screens of  FIG. 75A ; 
         FIG. 76A  is a perspective view of a vertical screen, according to another embodiment; 
         FIG. 76B  is a top-down view of the vertical screen of  FIG. 76A ; 
         FIG. 76C  is a side-view of the vertical screen of  FIG. 76A ; 
         FIG. 77A  is a perspective view of a vertical screen, according to another embodiment; 
         FIG. 77B  is a top-down view of the vertical screen of  FIG. 77A ; 
         FIG. 77C  is a side-view of the vertical screen of  FIG. 77A ; 
         FIG. 78A  is a perspective view of a vertical screen, according to another embodiment; 
         FIG. 78B  is a top-down view of the vertical screen of  FIG. 78A ; 
         FIG. 78C  is a side-view of the vertical screen of  FIG. 78A ; 
         FIG. 79  is a cross-sectional view of the air treatment member of  FIG. 35  taken along the section line  79 - 79 ′ in  FIG. 35 , in accordance with some embodiments; 
         FIG. 80  is the cross-sectional view of the air treatment member of  FIG. 79  with an opened end wall; 
         FIG. 81  is the cross-sectional view of the air treatment member of  FIG. 79 , in accordance with some other embodiments; 
         FIG. 82  is the cross-sectional view of the air treatment member of  FIG. 81  with an opened end wall; 
         FIG. 83  is the cross-sectional view of the air treatment member of  FIG. 79 , in accordance with another embodiment; 
         FIG. 84  is a perspective view of a surface cleaning apparatus in accordance with an embodiment; 
         FIG. 85A  is a perspective cross-sectional view of an air treatment member of the surface cleaning apparatus of  FIG. 84  taken along sectional line  85 - 85 ′ of  FIG. 84  showing a cleaning member in a storage configuration; 
         FIG. 85B  is a perspective cross-sectional view of the air treatment member of  FIG. 85A  showing the cleaning member in an in-use configuration; 
         FIG. 86  is a cross-sectional view of the air treatment member of  FIG. 85A  taken along the section line  86 - 86 ′ in  FIG. 85 , according to some embodiments; 
         FIGS. 87A-87E  are perspective cross-sectional views of the air treatment member of  FIG. 84  taken along the section line  85 - 85 ′ in  FIG. 84 , showing a cleaning member and handle assembly transitioning from a storage configuration to an in-use or emptying configuration, and then back to a storage configuration, in accordance with an embodiment; 
         FIG. 88  is a perspective cross-sectional view of the air treatment member of  FIG. 84  taken along the section line  85 - 85 ′ showing the cleaning member and handle assembly in an in-use configuration, in accordance with some embodiments; 
         FIGS. 89A-89C  are perspective cross-sectional views of the air treatment member of  FIG. 84  taken along the section line  85 - 85 ′ in  FIG. 84  in accordance with another embodiment, showing the cleaning member and handle assembly transitioning from a storage configuration to an emptying configuration; 
         FIG. 90A  is a perspective cross-sectional view of the air treatment member of  FIG. 84  taken along the section line  85 - 85 ′ in  FIG. 84  showing a multi-inlet cyclone, in accordance with some embodiments; 
         FIG. 90B  is a side perspective view of a cleaning member, in accordance with some embodiments; 
         FIG. 90C  is a bottom-side perspective view of the cleaning member of  FIG. 90B ; 
         FIG. 91  is a perspective cross-sectional view of the air treatment member of  FIG. 90A  showing the cleaning member in a cleaning configuration; 
         FIG. 92A  is a perspective view of an air treatment member, in accordance with an embodiment; 
         FIG. 92B  is a perspective view of the air treatment member of  FIG. 92A  showing a perspective cross-sectional view of a track for a handle assembly which is taken along section line  92 B- 92 B′ of  FIG. 92A ; 
         FIG. 92C  is a perspective cross-sectional view of the air treatment member of  FIG. 92A , taken along the section line  92 C- 92 C′ of  FIG. 92B , showing the cleaning member and handle assembly in a storage configuration; 
         FIG. 93A  is a perspective view of the air treatment member of  FIG. 92A  showing an opened end wall; 
         FIG. 93B  is a perspective view of the air treatment member of  FIG. 93  showing a perspective cross-sectional view of the track for the handle assembly taken along the section line  93 B- 93 B′ of  FIG. 93A ; 
         FIG. 93C  is a perspective cross-sectional view of the air treatment member of  FIG. 93A , taken along the section line  93 C- 93 C′ of  FIG. 93B , showing an opened end wall; 
         FIG. 94A  is the perspective cross-sectional view of the air treatment member of  FIG. 92C , showing a handle of the handle assembly in a storage position; 
         FIG. 94B  is an enlarged perspective view of a portion of the air treatment member of  FIG. 94A , showing the handle in the storage position; 
         FIG. 95A  is the perspective cross-sectional view of the air treatment member of  FIG. 92C , showing a handle of the handle assembly in an in-use position; 
         FIG. 95B  is an enlarged perspective view of a portion of the air treatment member of  FIG. 95B , showing the handle in the in-use position; 
         FIG. 96  is a perspective view of an external dirt chamber of an air treatment member, according to some embodiments; 
         FIG. 97  is a perspective view of the external dirt chamber of the air treatment member of  FIG. 96 , showing a partially opened end wall; 
         FIG. 98  is a perspective view of the external dirt chamber of the air treatment member of  FIG. 96 , showing an opened end wall; 
         FIG. 99  is a perspective cross-sectional view of the external dirt chamber of the air treatment member of  FIG. 96  taken along section line  99 - 99 ′ of  FIG. 96 , in accordance with some other embodiments; 
         FIG. 100  is a perspective cross-sectional view of the external dirt chamber of  FIG. 99 , showing a partially opened end wall; 
         FIG. 101  is a perspective cross-sectional view of the external dirt chamber of  FIG. 99 , showing an opened end wall; 
         FIG. 102A  is a perspective cross-sectional view of the air treatment member of  FIG. 84 , taken along the section line  85 - 85 ′ of  FIG. 84 , showing the cleaning member in a storage position, in accordance with some embodiments; 
         FIG. 102B  is a perspective cross-sectional view of the air treatment member of  FIG. 84 , taken along the section line  85 - 85 ′ of  FIG. 84 , showing the cleaning member in a cleaned position, in accordance with some embodiments; 
         FIG. 102C  is a cross-sectional view of the air treatment member of  FIG. 102A , taken along the section line  102 C- 102 C′ of  FIG. 102A ; 
         FIGS. 103A-103E  are enlarged cross-sectional views of a telescoping elongate rod, used in a driving assembly in an air treatment member, taken along section line  85 - 85 ′ of  FIG. 84 , showing the elongate rod extended from a retracted storage position to an extended use position; 
         FIG. 104A  is a perspective view of an air treatment member with a driving assembly extending through a first cyclone end; 
         FIG. 104B  is an enlarged perspective view of a portion of the air treatment member of  FIG. 104A ; 
         FIG. 105  is a perspective cross-sectional view of the air treatment member of  FIG. 104A , taken along the section line  105 - 105 ′ of  FIG. 104A ; 
         FIGS. 106A-106E  are perspective cross-sectional views of the air treatment member of  FIG. 104A , taken along the section line  105 - 105 ′ of  FIG. 104A , showing the cleaning member translated from a storage position to various cleaned positions; 
         FIG. 107A  is an enlarged perspective cross-sectional view of a portion of the air treatment member of  FIG. 104A , taken along the section line  105 - 105 ′ of  FIG. 104A , showing a door locking mechanism in a locked configuration; 
         FIG. 107B  is an enlarged perspective cross-sectional view of a portion of the air treatment member of  FIG. 104A , taken along the section line  105 - 105 ′ of  FIG. 104A , showing the door locking mechanism is an unlocked configuration; 
         FIGS. 108A-108C  are perspective cross-sectional views of the air treatment member of  FIG. 104A , taken along the section line  105 - 105 ′ of  FIG. 104A , showing the cleaning member and shroud translated from a storage position to various cleaned positions; 
         FIG. 109A  is a perspective view of an alternate embodiment of the air treatment member of  FIG. 104A , wherein the driving assembly is in a retracted storage position; 
         FIG. 109B  is a perspective view of the air treatment member of  FIG. 109A , showing the driving assembly in an extended use position; 
         FIG. 110A  is a perspective view of an alternate embodiment of the air treatment member of  FIG. 104A , wherein the driving assembly is in a retracted storage position; 
         FIG. 110B  is a perspective view of the air treatment member of  FIG. 110A , showing the driving assembly in an extended use position; 
         FIG. 111A  is a perspective view of an air treatment member having a driving assembly extending through a second cyclone end; 
         FIG. 111B  is a perspective cross-sectional view of the air treatment member of  FIG. 111A , taken along the section line  111 B- 111 B′ of  FIG. 111A ; 
         FIG. 111C  is a bottom-up, inverted perspective view of the air treatment member of  FIG. 111A ; 
         FIGS. 112A-112F  are perspective cross-sectional views of the air treatment member of  FIG. 111A , taken along the section line  111 B- 111 B′ of  FIG. 111A , showing the cleaning member translated to various cleaned positions; 
         FIGS. 113A-113C  are perspective cross-sectional views of the air treatment member of  FIG. 111A , taken along the section line  111 B- 111 B′ of  FIG. 111A , showing the cleaning member and shroud translated to various cleaned positions; 
         FIG. 114  is a perspective view of an alternate embodiment of a surface cleaning apparatus; 
         FIG. 115  is a perspective cross-sectional view of the surface cleaning apparatus of  FIG. 114 , taken along the section line  115 - 115 ′ of  FIG. 114 ; 
         FIG. 116A  is a partial perspective view of the surface cleaning apparatus of  FIG. 114 , showing an air treatment member mounted to an upright section of the surface cleaning apparatus; 
         FIG. 116B  is a perspective cross-sectional view of  FIG. 116A , taken along the section line  116 B- 116 B′ of  FIG. 116A ; 
         FIG. 116C  is a perspective cross-sectional view of  FIG. 116A , taken along the section line  116 C- 116 C′ of  FIG. 116B ; 
         FIG. 117A  is a perspective cross-sectional view, taken along section line  116 B- 116 B′ of  FIG. 116A , showing the air treatment member of  FIG. 116A  being dismounted from the surface cleaning apparatus; 
         FIG. 117B  is a perspective view of the air treatment member of  FIG. 116A , showing the air treatment member dismounted from the surface cleaning apparatus; 
         FIG. 117C  is a perspective view of the air treatment member of  FIG. 116A  when dismounted from the surface cleaning apparatus; 
         FIG. 118A  is a perspective view of an alternate air treatment member; 
         FIG. 118B  is a perspective cross-sectional view of the air treatment member of  FIG. 118A , taken along the section line  118 B- 118 B′ of  FIG. 118A ; 
         FIG. 118C  a perspective cross-sectional view of the air treatment member of  FIG. 118A , taken along the section line  118 C- 118 C′ of  FIG. 118A ; 
         FIG. 118D  a cross-sectional view of the air treatment member of  FIG. 118A , taken along the section line  118 D- 118 D′ of  FIG. 118A ; 
         FIGS. 119A-119F  are cross-sectional views of various embodiments of the air treatment member of  FIG. 118A , taken along the section line  119 - 119 ′ of  FIG. 118A ; 
         FIG. 120A  is a perspective view of the air treatment member of  FIG. 118A , showing the air treatment member mounted to an upright section of the surface cleaning apparatus of  FIG. 114 ; 
         FIG. 120B  is a perspective cross-sectional view, taken along the section line  120 B- 120 B′ of  FIG. 120A ; 
         FIG. 120C  is a perspective cross-sectional view taken along the section line  120 C- 120 C′ of  FIG. 120A , showing the air treatment member being dismounted from the upright section of the surface cleaning apparatus of  FIG. 114 ; 
         FIGS. 121A-121C  are cross-sectional views of an embodiment of the air treatment member of  FIG. 117C , taken along the section line  121 A- 121 A′ of  FIG. 117C , showing the cleaning member translated to various cleaned positions; 
         FIG. 122A  is an enlarged view of a portion of the cross-sectional view of  FIG. 121A  showing a door locking mechanism in a locked position; 
         FIG. 122B  is an enlarged view of a portion of the cross-sectional view of  FIG. 121B  showing the door locking mechanism in an unlocked position; 
         FIG. 123A  is a perspective view of an alternate embodiment of an air treatment member; 
         FIG. 123B  is a perspective cross-sectional view of the air treatment member of  FIG. 123A , taken along the section line  123 B- 123 B′ of  FIG. 123A  showing a door locking mechanism in a locked position; 
         FIG. 123C  is a perspective cross-sectional view of the air treatment member of  FIG. 123A , taken along the section line  123 B- 123 B′ of  FIG. 123A  showing the door locking mechanism in an unlocked position; 
         FIG. 124A  is a perspective view of an alternate air treatment member; 
         FIG. 124B  is a perspective cross-sectional view of the air treatment member of  FIG. 124A , taken along the section line  124 B- 124 B′ of  FIG. 124A  showing a door locking mechanism in a locked position; 
         FIG. 124C  is a perspective cross-sectional view of the air treatment member of  FIG. 124A , taken along the section line  124 B- 124 B′ of  FIG. 124A  showing the door locking mechanism in an unlocked position; 
         FIG. 125A  is a perspective view of an alternate air treatment member; 
         FIG. 125B  is a perspective cross-sectional view of the air treatment member of  FIG. 125A , taken along the section line  125 B- 125 B′ of  FIG. 125A  showing the cleaning member in a storage position; 
         FIG. 125C  is a perspective cross-sectional view of the air treatment member of  FIG. 125A , taken along the section line  125 B- 125 B′ of  FIG. 125A  showing the cleaning member in a cleaned position; 
         FIGS. 126A-126D  are perspective cross-sectional views of an embodiment of the air treatment member of  FIG. 117C , taken along the section line  121 A- 121 A′ of  FIG. 117C , showing the cleaning member translated from a storage position to various cleaned positions; 
         FIGS. 127A-127E  are perspective cross-sectional views of an embodiment of the air treatment member of  FIG. 117C , taken along the section line  121 A- 121 A′ of  FIG. 117C , showing the cleaning member and shroud translated from a storage position to various cleaned positions; 
         FIG. 128  is an enlarged perspective cross-sectional view of a portion of the air treatment member of  FIG. 117C , according to another embodiment, taken along the section line  121 A- 121 A′ of  FIG. 117C , showing the cleaning member and shroud in a storage position; 
         FIGS. 129A-129D  are perspective cross-sectional views of the air treatment member of  FIG. 128 , taken along the section line  121 A- 121 A′ of  FIG. 117C , showing the cleaning member and shroud translated to various cleaned positions; 
         FIG. 130  is an enlarged perspective cross-sectional view of a portion of the air treatment member of  FIG. 117C , according to still another embodiment, taken along the section line  121 A- 121 A′ of  FIG. 117C , showing the cleaning member in a storage position; 
         FIGS. 131A-131D  are perspective cross-sectional views of the air treatment member of  FIG. 130 , taken along the section line  121 A- 121 A′ of  FIG. 117C , showing the cleaning member translated to various cleaned positions; 
         FIG. 132  is a perspective view of an alternate air treatment member; 
         FIG. 133A  is a perspective cross-sectional view of the air treatment member of  FIG. 132 , taken along the section line  133 A- 133 A′ of  FIG. 132 , showing the cleaning member in a storage position; 
         FIG. 133B  is an enlarged perspective cross-sectional view of a portion of the air treatment member of  FIG. 132 , taken along the section line  133 A- 133 A′ of  FIG. 132 ; 
         FIGS. 134A-134E  are perspective cross-sectional views of the air treatment member of  FIG. 132 , taken along the section line  133 A- 133 A′ of  FIG. 132 , showing the cleaning member translated to various cleaned positions; 
         FIG. 135A  is a perspective view of an alternate air treatment member; 
         FIG. 135B  is a perspective cross-sectional view of the air treatment member of  FIG. 135A , taken along the section line  135 B- 135 B′ of  FIG. 135A , showing the cleaning member in a storage position; 
         FIGS. 136A-136E  are perspective cross-sectional views of the air treatment member of  FIG. 135A , taken along the section line  135 B- 135 B′ of  FIG. 135A , showing the cleaning member translated to various cleaned positions; 
         FIG. 137A  is a perspective view of an alternate air treatment member; 
         FIG. 137B  is a side elevation view of the air treatment member of  FIG. 137A ; 
         FIG. 137C  is a perspective cross-sectional view of the air treatment member of  FIG. 137A , taken along the section line  137 C- 137 C′ of  FIG. 137A , showing the cleaning member in a storage position; 
         FIG. 138A  is a side elevation view of the air treatment member of  FIG. 137A , showing the cleaning member translated to a cleaned position; 
         FIG. 138B  is a perspective cross-sectional view of the air treatment member of  FIG. 138A , taken along the section line  137 C- 137 C′ of  FIG. 137A ; 
         FIG. 139A  is a side elevation view of the air treatment member of  FIG. 137A , showing the cleaning member translated further into a cleaned position; 
         FIG. 139B  is a perspective cross-sectional view of the air treatment member of  FIG. 138A , taken along the section line  137 C- 137 C′ of  FIG. 137A ; 
         FIG. 140A  is a perspective view of an alternate air treatment member; 
         FIG. 140B  is a perspective cross-sectional view of the air treatment member of  FIG. 140A , taken along the section line  140 B- 140 B′ of  FIG. 140A , showing the cleaning member in a storage position; 
         FIGS. 141A-141E  are perspective cross-sectional views of the air treatment member of  FIG. 140A , taken along the section line  140 B- 140 B′ of  FIG. 140A , showing the cleaning member translated to various cleaned positions; 
         FIG. 142A  is a perspective view of an alternate air treatment member; 
         FIG. 142B  is a perspective cross-sectional view of the air treatment member of  FIG. 142A , taken along the section line  142 B- 142 B′ of  FIG. 142A , showing the cleaning member in a storage position; 
         FIG. 142C  is a side elevation view of the air treatment member of  FIG. 142A , showing the cleaning member translated into a cleaned position; 
         FIGS. 143A-143D  show perspective cross-sectional views of the air treatment member of  FIG. 142A , taken along the section line  142 B- 142 B′ of  FIG. 142A , showing the cleaning member translated to various cleaned positions; 
         FIG. 144  is a perspective view of an alternate air treatment member; 
         FIG. 145A  is a side elevation view of the air treatment member of  FIG. 144 ; 
         FIG. 145B  is a perspective cross-sectional view of the air treatment member of  FIG. 144 , taken along the section line  145 B- 145 B′ of  FIG. 144 , showing the cleaning member in a storage position; 
         FIG. 146A  is a side elevation view of the air treatment member of  FIG. 144 , showing the cleaning member translated into a cleaned position; 
         FIG. 146B  is a perspective cross-sectional view of the air treatment member of  FIG. 146A , taken along the section line  145 B- 145 B′ of  FIG. 144 ; 
         FIG. 147A  is a side elevation view of the air treatment member of  FIG. 144 , showing the cleaning member translated further into a cleaned position; 
         FIG. 147B  is a perspective cross-sectional view of the air treatment member of  FIG. 147A , taken along the section line  145 B- 145 B′ of  FIG. 144 ; 
         FIG. 148A  is a perspective view of an alternate air treatment member; 
         FIG. 148B  is a perspective cross-sectional view of the air treatment member of  FIG. 148A , taken along the section line  148 B- 148 B′ of  FIG. 148A , showing the cleaning member in a storage position; 
         FIG. 148C  is an enlarged view of a portion of the perspective cross-sectional view of  FIG. 148B ; 
         FIGS. 149A-149E  are perspective cross-sectional views of the air treatment member of  FIG. 148A , taken along the section line  148 B- 148 B′ of  FIG. 148A , showing the cleaning member translated to various cleaned positions; 
         FIG. 150  is a perspective view of an alternate air treatment member; 
         FIGS. 151A-151C  are perspective cross-sectional views of the air treatment member of  FIG. 150 , taken along the section line  151 - 151 ′ of  FIG. 150 , showing the cleaning member translated from a storage position to various cleaned positions; 
         FIG. 152  is a perspective view of an alternate air treatment member; 
         FIGS. 153A-153C  are perspective cross-sectional views of the air treatment member of  FIG. 152 , taken along the section line  153 - 153 ′ of  FIG. 152 , showing the cleaning member translated from a storage position to various cleaned positions; 
         FIG. 154A  is a perspective view of an alternate air treatment member; 
         FIG. 154B  is a perspective cross-sectional view of the air treatment member of  FIG. 154A , taken along the section line  154 B- 154 B′ of  FIG. 154A , showing the shroud in a storage position; 
         FIG. 154C  is an enlarged view of a portion of the cross-sectional view of  FIG. 154B ; 
         FIG. 155A  is a perspective view of the air treatment member of  FIG. 154A , with the shroud translated into a cleaned position; 
         FIG. 155B  is a perspective cross-sectional view of the air treatment member of  FIG. 155A , taken along the section line  155 B- 155 B′ of  FIG. 155A ; 
         FIG. 156A  is a perspective view of the air treatment member of  FIG. 154A , with the shroud translated further into a cleaned position; 
         FIG. 156B  is a perspective cross-sectional view of the air treatment member of  FIG. 155A , taken along the section line  156 B- 156 B′ of  FIG. 156A ; 
         FIG. 157A  is a perspective view of an alternate air treatment member; 
         FIG. 157B  is a perspective cross-sectional view of the air treatment member of  FIG. 157A , taken along the section line  157 B- 157 B′ of  FIG. 157A ; 
         FIGS. 158A-158E  are perspective cross-sectional views of the air treatment member of  FIG. 157A , taken along the section line  157 B- 157 B′ of  FIG. 157A , showing the cleaning member translated from a storage position to various cleaned positions; 
         FIG. 159A  is a perspective view of an alternate air treatment member; 
         FIG. 159B  is a perspective cross-sectional view of the air treatment member of  FIG. 159A , taken along the section line  159 B- 159 B′ of  FIG. 159A ; 
         FIGS. 160A-160E  are perspective cross-sectional views of the air treatment member of  FIG. 159A , taken along the section line  159 B- 159 B′ of  FIG. 159A , showing the cleaning member translated from a storage position to various cleaned positions; 
         FIG. 161A  is a perspective view of an alternate air treatment member; 
         FIG. 161B  is a perspective cross-sectional view of the air treatment member of  FIG. 161A , taken along section line  161 B- 161 B′ of  FIG. 161A , showing the driving assembly in a retracted storage position; 
         FIG. 161C  is a perspective cross-sectional view of the air treatment member of  FIG. 161A , taken along section line  161 B- 161 B′ of  FIG. 161A , showing the driving assembly in an expanded or telescoped use position; 
         FIG. 161D  is a perspective cross-sectional view of the air treatment member of  FIG. 161A , taken along section line  161 B- 161 B′ of  FIG. 161A , showing the shroud translated into a cleaned position; 
         FIG. 162A  is a perspective view of an air treatment member, according to an embodiment, showing the driving assembly in a storage position; 
         FIG. 162B  is a perspective cross-sectional view of the air treatment member of  FIG. 162A , taken along the section line  162 B- 162 B′ of  FIG. 162A ; 
         FIG. 163A  is a perspective view of the air treatment member of  FIG. 162A , showing the driving assembly rotated into a use position; 
         FIG. 163B  is a perspective cross-sectional view of the air treatment member of  FIG. 162A , taken along the section line  162 B- 162 B′ of  FIG. 162A , showing the shroud translated into a cleaned position; 
         FIG. 163C  is a perspective cross-sectional view of the air treatment member of  FIG. 162A , taken along the section line  162 B- 162 B′ of  FIG. 162A , showing the shroud translated further into a cleaned position; 
         FIG. 163D  is a perspective view of the air treatment member of  FIG. 163A , and showing the driving assembly rotated into a locked position; 
         FIG. 164A  is a perspective view of an alternate air treatment member; 
         FIG. 164B  is a perspective cross-sectional view of the air treatment member of  FIG. 164A , taken along section line  164 B- 164 B′ of  FIG. 164A , showing the shroud in a storage position; 
         FIG. 164C  is a perspective cross-sectional view of the air treatment member of  FIG. 164A , taken along section line  164 B- 164 B′ of  FIG. 164A , showing the shroud in a cleaned position; 
         FIG. 165A  is a perspective cross-sectional view of another embodiment of the air treatment member of  FIG. 164A , taken along section line  164 B- 164 B′ of  FIG. 164A , showing the shroud in a storage position; 
         FIG. 165B  is a perspective cross-sectional view of the embodiment of the air treatment member shown in  FIG. 165A , taken along section line  164 B- 164 B′ of  FIG. 164A , showing the shroud in a cleaned position; 
         FIG. 166A  is a perspective view of an alternate air treatment member; 
         FIG. 166B  is a cross-sectional perspective view of the air treatment member of  FIG. 166A , taken along the section line  166 B- 166 B′ of  FIG. 166A , showing the shroud in a storage position; and, 
         FIG. 166C  is a perspective view of the air treatment member of  FIG. 166A , and showing the shroud in a cleaned position. 
     
    
    
     DESCRIPTION OF EXAMPLE EMBODIMENTS 
     Numerous embodiments are described in this application, and are presented for illustrative purposes only. The described embodiments are not intended to be limiting in any sense. The invention is widely applicable to numerous embodiments, as is readily apparent from the disclosure herein. Those skilled in the art will recognize that the present invention may be practiced with modification and alteration without departing from the teachings disclosed herein. Although particular features of the present invention may be described with reference to one or more particular embodiments or figures, it should be understood that such features are not limited to usage in the one or more particular embodiments or figures with reference to which they are described. 
     The terms “an embodiment,” “embodiment,” “embodiments,” “the embodiment,” “the embodiments,” “one or more embodiments,” “some embodiments,” and “one embodiment” mean “one or more (but not all) embodiments of the present invention(s),” unless expressly specified otherwise. 
     The terms “including,” “comprising” and variations thereof mean “including but not limited to,” unless expressly specified otherwise. A listing of items does not imply that any or all of the items are mutually exclusive, unless expressly specified otherwise. The terms “a,” “an” and “the” mean “one or more,” unless expressly specified otherwise. 
     As used herein and in the claims, two or more parts are said to be “coupled”, “connected”, “attached”, “joined”, “affixed”, or “fastened” where the parts are joined or operate together either directly or indirectly (i.e., through one or more intermediate parts), so long as a link occurs. As used herein and in the claims, two or more parts are said to be “directly coupled”, “directly connected”, “directly attached”, “directly joined”, “directly affixed”, or “directly fastened” where the parts are connected in physical contact with each other. As used herein, two or more parts are said to be “rigidly coupled”, “rigidly connected”, “rigidly attached”, “rigidly joined”, “rigidly affixed”, or “rigidly fastened” where the parts are coupled so as to move as one while maintaining a constant orientation relative to each other. None of the terms “coupled”, “connected”, “attached”, “joined”, “affixed”, and “fastened” distinguish the manner in which two or more parts are joined together. 
     Further, although method steps may be described (in the disclosure and/or in the claims) in a sequential order, such methods may be configured to work in alternate orders. In other words, any sequence or order of steps that may be described does not necessarily indicate a requirement that the steps be performed in that order. The steps of methods described herein may be performed in any order that is practical. Further, some steps may be performed simultaneously. 
     As used herein and in the claims, two elements are said to be “parallel” where those elements are parallel and spaced apart, or where those elements are collinear. 
     Some elements herein may be identified by a part number, which is composed of a base number followed by an alphabetical or subscript-numerical suffix (e.g.  112   a , or  112   1 ). Multiple elements herein may be identified by part numbers that share a base number in common and that differ by their suffixes (e.g.  112   1 ,  112   2 , and  112   3 ). All elements with a common base number may be referred to collectively or generically using the base number without a suffix (e.g.  112 ). 
     General Description of a Hand Vacuum Cleaner 
     Referring to  FIGS. 1-4 , the following is a general discussion of embodiments of an apparatus  100 , which provides a basis for understanding several of the features that are discussed herein. As discussed subsequently, each of the features may be used individually or in any particular combination or sub-combination in these or in other embodiments disclosed herein. 
     Embodiments described herein include an improved cyclonic air treatment member  116 , and a surface cleaning apparatus  100  including the same. Surface cleaning apparatus  100  may be any type of surface cleaning apparatus, including for example a hand vacuum cleaner as shown in  FIG. 1-2 , a stick vacuum cleaner, an upright vacuum cleaner as shown in  FIG. 3-4 , a canister vacuum cleaner, an extractor, or a wet/dry type vacuum cleaner. 
     In  FIGS. 1-2 , surface cleaning apparatus  100  is illustrated as a hand vacuum cleaner, which may also be referred to also as a “handvac” or “hand-held vacuum cleaner”. As used herein, a hand vacuum cleaner is a vacuum cleaner that can be operated to clean a surface generally one-handedly. That is, the entire weight of the vacuum may be held by the same one hand used to direct a dirty air inlet of the vacuum cleaner with respect to a surface to be cleaned. For example, handle  104  and dirty air inlet  108  may be rigidly coupled to each other (directly or indirectly), such as being integrally formed or separately molded and then non-removably secured together (e.g. adhesive or welding), so as to move as one while maintaining a constant orientation relative to each other. This is to be contrasted with canister and upright vacuum cleaners, whose weight is typically supported by a surface (e.g. a floor) during use. When a canister vacuum cleaner is operated, or when an upright vacuum cleaner is operated in a ‘lift-away’ configuration, a second hand is typically required to direct the dirty air inlet at the end of a flexible hose. 
     In the example of  FIGS. 3-4 , upright vacuum cleaner  100  is shown including an upright section  120 . Handle  104  is connected to an upper end  124  of upright section  120 , and a surface cleaning head  128  (also referred to as a ‘floor cleaning head’) is movably (e.g. pivotally) connected to a lower end  132  of upright section  120 . Upright section  120  may be movable (e.g. pivotable) relative to surface cleaning head  128  between a storage position (shown) and a rearwardly reclined floor cleaning position. 
     Referring to  FIGS. 1-4 , surface cleaning apparatus  100  includes an air treatment member  116  (which may be permanently affixed to the main body or may be removable in part or in whole therefrom for emptying), a dirty air inlet  108 , a clean air outlet  112 , and an air flow path  136  extending between the dirty air inlet  108  and the clean air outlet  112 . 
     Surface cleaning apparatus  100  has a front end  140 , a rear end  144 , an upper end (also referred to as the top)  148 , and a lower end (also referred to as the bottom)  152 . In the embodiment of  FIGS. 1-2 , dirty air inlet  108  is at a lower portion of apparatus front end  140  and clean air outlet  112  is at a rearward portion of apparatus  100  proximate apparatus rear end  144 . 
     It will be appreciated that dirty air inlet  108  and clean air outlet  112  may be positioned in different locations of apparatus  100 . For example,  FIGS. 3-4  show an example in which dirty air inlet  108  is located at a lower end  156  of surface cleaning head  128 , and clean air outlet  112  is located on apparatus front end  140 . 
     Referring again to  FIGS. 1-4 , a suction motor  160  is provided to generate vacuum suction through air flow path  136 , and is positioned within a motor housing  164 . Suction motor  160  may be a fan-motor assembly including an electric motor and impeller blade(s). In the illustrated embodiment, suction motor  160  is positioned in the air flow path  136  downstream of air treatment member  116 . In this configuration, suction motor  160  may be referred to as a “clean air motor”. Alternatively, suction motor  160  may be positioned upstream of air treatment member  116 , and referred to as a “dirty air motor”. 
     In the illustrated embodiments, apparatus  100  is shown having two cyclonic cleaning stages  168   1  and  168   2  arranged in series with each other. It will be appreciated that air treatment member  116  may include a single cleaning stage (e.g., first cyclonic cleaning stage  168   1  or second cyclonic cleaning stage  168   2 ) or two or more cyclonic cleaning stages (e.g., both first and second cleaning stages  168   1  and  168   2 ). Each cyclonic cleaning stage  168  may include one cyclone  170  as shown, or many cyclones arranged in parallel with each other, and may include one dirt collection chamber  172  or many dirt collection chambers  172 , of any suitable configuration. For example,  FIG. 2  exemplifies an embodiment wherein second cyclonic cleaning stage  168   2  includes a cyclone chamber  176  having a dirt outlet  178  to an external dirt collection chamber  172 . Each cyclone  170  may have its own dirt collection chamber as shown. Alternatively or in addition, two or more cyclones  170  may share a common dirt collection chamber. Alternately, as also exemplified in  FIG. 2 , a cyclone  168   1  may have a dirt collection region in a portion of the cyclone chamber (e.g., a lower end of a cyclone chamber or an end of the cyclone chamber distal to the air outlet end of the cyclone chamber). 
     Air treatment member  116  is configured to remove particles of dirt and other debris from the air flow. In the illustrated example, air treatment member  116  includes a cyclone assembly (also referred to as a “cyclone bin assembly”) having at least a first cyclonic cleaning stage  168   1  with a cyclone  170  and a dirt collection chamber  172  (also referred to as a “dirt collection region”, “dirt collection bin”, “dirt bin”, or “dirt chamber”). Cyclone  170  has a cyclone chamber  176 . As exemplified, dirt collection chamber  172  may be external to the cyclone chamber  176  (i.e. dirt collection chamber  172  may have a discrete volume from that of cyclone chamber  176 ), or dirt collection chamber  172  may be a dirt collection region located partially or entirely within a volume of cyclone chamber  176 . 
       FIG. 118B  exemplifies an embodiment of a dirt collection chamber  172  located exterior to the volume of the cyclone chamber  176 . In the exemplified embodiment, a deflector or arrestor plate  810  is positioned proximal one end of the cyclone chamber  176  (e.g., a second cyclone end  244 , opposite the cyclone end having the cyclone air inlet  204 ), and is spaced from the cyclone end  244 . The dirt chamber  172  defines the area between the cyclone end  244 , and the arrestor plate  810 . In the exemplified embodiment, the dirt chamber is in communication with the cyclone chamber via a dirt outlet  178  that is formed as a slot in the cyclone sidewall  236 . Other dirt outlets known in the art may be used. Optionally, as exemplified, the arrestor plate  810  can be supported, e.g., by a support member  812 , that is mounted to an openable door  352  (e.g., defined by the second cyclone end  244 ). As explained in further detail herein, door  352  can be opened to empty the majority of loose dirt and debris contained in cyclone chamber  176  as well as in the dirt chamber  172 . As exemplified, by supporting the arrestor plate  810  on the door  352 , this can allow the arrestor plate  810  to open concurrently with the openable door  352 . Alternatively, in other embodiment, the arrestor plate  810  may be mounted to the sidewall  236  (or other portion of the surface cleaning apparatus  100 ). It will be appreciated that, in other embodiments, cyclone  170  and dirt collection chamber  172  may be of any other configuration suitable for separating dirt from an air stream and collecting the separated dirt respectively. 
     Referring to  FIGS. 2 and 4 , surface cleaning apparatus  100  may include a pre-motor filter  180  provided in the air flow path  136  downstream of air treatment member  116  and upstream of suction motor  160 . Pre-motor filter  180  may be formed from any suitable physical, porous filter media. For example, pre-motor filter  180  may be one or more of a foam filter, felt filter, HEPA filter, or other physical filter media. In some embodiments, pre-motor filter  180  may include an electrostatic filter, or the like. As shown, pre-motor filter  180  may be located in a pre-motor filter housing  184  that is external to the air treatment member  116 . 
     As shown in  FIG. 2 , dirty air inlet  108  may be the inlet end  188  of an air inlet conduit  192 . Optionally, inlet end  188  of air inlet conduit  192  can be used as a nozzle to directly clean a surface. Alternatively, or in addition to functioning as a nozzle, air inlet conduit  192  may be connected (e.g. directly connected) to the downstream end of any suitable accessory tool such as a rigid air flow conduit (e.g., an above floor cleaning wand), a crevice tool, a mini brush, and the like. As shown, dirty air inlet  108  may be positioned forward of air treatment member  116 , although this need not be the case. 
     In the embodiments of  FIGS. 2 and 4 , the air treatment member  116  comprises one or more cyclonic cleaning stages  168 , the air treatment air inlet is a cyclone air inlet  196  (e.g. a tangential air inlet of first stage  168   1 ), and the air treatment member air outlet is a cyclone air outlet  204  (e.g. of second stage  168   2 ). The cyclone air inlet  196  may have a length (or height)  196   a  in the direction of the cyclone axis  232  (see e.g.,  FIGS. 45-47 ). In operation, after activating suction motor  160 , dirty air enters apparatus  100  through dirty air inlet  108  and is directed along air inlet conduit  192  to the cyclone air inlet  196  of first stage  168   1 . As shown, cyclone air inlet  196  may direct the dirty air flow to enter cyclone chamber  176  in a tangential direction so as to promote cyclonic action. Dirt particles and other debris may be disentrained (i.e. separated) from the dirty air flow as the dirty air flow travels through first cyclonic stage  168   1 —from the respective cyclone air inlet  196  to cyclone air outlet  204 . The disentrained dirt particles and debris may collect in dirt collection chamber or region  172  of first stage  168   1 , where the dirt particles and debris may be stored until the dirt collection region is emptied. From cyclone air outlet  204 , the air may flow downstream through second stage  168   2 —from the respective cyclone air inlet(s)  196  to cyclone air outlet  204 , whereby separated dirt particles may discharge through dirt outlet  178  into dirt collection chamber  172 . 
     Air exiting a cyclone chamber  176  may pass through an outlet passage  208  located upstream of the cyclone air outlet  204 . Cyclone chamber outlet passage  208  may also act as a vortex finder to promote cyclonic flow within cyclone chamber  176 . In some embodiments, cyclone outlet passage  208  may include a porous member, such as a screen or shroud  212  (e.g. a fine mesh screen) in the air flow path  136  to remove large dirt particles and debris, such as hair, remaining in the exiting air flow. The screen or shroud  212  may have any configurations known in the art. For example, the shroud  212  may be cylindrical (e.g.,  FIGS. 1-31, 49-50 ), conical or frusto-concial (see e.g.,  FIGS. 45-48 ). The shroud  212  may also have any suitable axial length  502 . For example, the axial length  502  of the shroud  212  may be approximately ⅕ th  of the cyclone height  320  (see e.g.,  FIG. 46 ), ⅖ th  of the cyclone height (e.g.,  FIG. 47 ), ⅗ th  of the cyclone height (e.g.,  FIG. 45 ), or ⅘ th  of the cyclone height. In other cases, the axial height  502  of the shroud  212  may be expressed as a proportion of the cyclone inlet height  196   a . For example, the axial height  502  of the shroud  212  may be in a range of 0.25-40, 0.50-20, 0.50-20, 1-5, or 1.5 to 3 times the cyclone inlet height  196   a.    
     From cyclone air outlet  204  of second stage  168   2 , the air flow may be directed into pre-motor filter housing  184  at an upstream side  216  of pre-motor filter  180 . The air flow may pass through pre-motor filter  180 , and then exit through pre-motor filter housing air outlet  220  into motor housing  164 . At motor housing  164 , the clean air flow may be drawn into suction motor  160  and then discharged from apparatus  100  through clean air outlet  112 . Prior to exiting the clean air outlet  112 , the treated air may pass through a post-motor filter  224 , which may include one or more layers of filter media. 
     Power may be supplied to suction motor  160  and other electrical components of apparatus  100  from an onboard energy storage member  228  ( FIG. 2 ) which may include, for example, one or more batteries or other energy storage device. The energy storage member  228  may be operable in either a low power mode or a high power mode. In the low power mode, the energy storage member  228  may operate the suction motor  160  at a low power level. For example, the low power mode may be used to extend the run time of the energy storage member  228 . In contrast, in the high power mode, the energy storage member  228  may operate the suction motor  160  at a high power level. In various cases, the high power mode may be used to increase the cleaning performance of the apparatus  100 , which may result in a shorter run time. In the example of  FIG. 2 , apparatus  100  includes a battery pack  228 . Battery pack  228  may be permanently connected to apparatus  100  and rechargeable in-situ, or removable from apparatus  100 . In the example shown, battery pack  228  is located below handle  104 . Alternatively or in addition to battery pack  228 , power may be supplied to apparatus  100  by an electrical cord (not shown) connected to apparatus  100  that can be electrically connected to mains power by at a standard wall electrical outlet. 
     Cyclone with an Openable Sidewall 
     The following is a discussion of a cyclone with an openable sidewall, which may be may be used by itself or with one or more of the moveable screen, the dual end walls, the medial cyclone air inlet, the exterior dirt collection chamber the axially extending member (vertically extending screen), and the dirt ejection mechanism. 
     A cyclone separates dirt and debris from an air stream that is moved through a cyclone chamber. Separated dirt and debris may be collected in a dirt collection chamber that is external to the cyclone chamber (e.g., via a cyclone chamber dirt outlet) or separated dirt and debris may be collected in a dirt collection region that is interior of the cyclone as exemplified by cyclone  168   1  of  FIG. 2 . A cyclone may be emptyable through an openable end door. However, some separated dirt and debris may collect on other interior surfaces of the cyclone, which may not be easily removed through the openable end door. For example, dirt and debris may accumulate or become entangled on the screen of a vortex finder of the cyclone. If not removed, this dirt and debris will occupy space inside the cyclone thereby reducing the volume available for cyclonic flow, which may reduce the dirt separation efficiency of the air treatment member. According to this aspect, a cyclone chamber is openable other than by merely opening the end of the cyclone chamber. 
       FIGS. 5-6  exemplify a cyclone, which may be referred to as a cyclonic air treatment member  116 , in accordance with an embodiment. As shown, cyclone bin assembly includes a cyclone  170  with a cyclone chamber  176 , a cyclone air inlet  196 , a cyclone air outlet  204 , and a cyclone axis of rotation  232  (also referred to as cyclone axis  232 ). The cyclone chamber  176  has a cyclone chamber sidewall  236  that extends axially between the chamber first end  240  and the chamber second end  244 . In the exemplified embodiment, the cyclone  170  is configured as a generally vertical, upright cyclone, wherein the cyclone air outlet  204  is positioned at the first cyclone end  240 , and the first cyclone end  240  is positioned above the second cyclone end  244 . In other embodiments, the cyclone  170  can be configured as a generally vertical, inverted cyclone, wherein the cyclone air outlet  204  is positioned at the second cyclone end  244 , with the first cyclone end  240  is positioned above the second cyclone end  244  (see for example  FIGS. 111-113 ). Other cyclone designs known in the art may also be used. 
     As exemplified, in accordance with this aspect, cyclone chamber sidewall  236  comprises a first portion  248  and a second portion  252  which are moveably mounted with respect to each other so as to provide an area to access the interior of the cyclone chamber that is larger than the cross sectional area of the end wall of the cyclone at second end  244 . As exemplified, first portion  248  is moveable relative to sidewall second portion  252  between a closed position ( FIG. 1 ) and an open position ( FIGS. 5-6 ). In the closed position ( FIG. 1 ), sidewall first portion  248  may meet (e.g. seal to) sidewall second portion  252  at first and second junctures  254   1  and  254   2 . This closes cyclone chamber  176  so that cyclone  170  can function to separate dirt and debris from air flow moving through cyclone chamber  176 . In the open position, sidewall first portion  248  is at least partially separated (e.g. spaced apart from) sidewall second portion  252  to define opening(s)  256  into cyclone chamber  176 . Dirt and debris collected, accumulated, or tangled within cyclone chamber  176  can be easily removed through cyclone chamber opening(s)  256 . As exemplified in  FIGS. 124A-124C , in some embodiments, the cyclone air inlet  196  may be provided along the sidewall first portion  248  (e.g., an openable bottom wall or an openable bottom portion as exemplified), and accordingly, may be moveable with the sidewall portion  248  to the open position (see for example  FIG. 124C ). 
     Referring to  FIGS. 1, 5, and 6 , each juncture  254  may be defined where an edge of sidewall first portion  248  meets an edge of sidewall second portion  252  in the closed position. As shown, first portion  248  may include first edge  260   1 , second portion  252  may include first edge  260   2 , and edges  260  may abut each other in the closed position to define first juncture  254   1 . Similarly, first portion  248  may include second edge  264   1 , second portion  252  may include second edge  264   2 , and edges  264  may abut each other in the closed position to define second juncture  254   2 . In the open position ( FIGS. 5-6 ), both edges  260 ,  264  may be moved apart to create an opening  256  into cyclone chamber  176  for emptying dirt and debris contained inside or, as exemplified in  FIG. 14 , one of the edges  260 ,  264  may be moved apart to create an opening  256  into cyclone chamber  176 . 
     Edges  260 ,  264  may be the plastic edges of the cyclone chamber side wall that abut each other or, alternately, a gasket or the like may be provided to assist in providing a seal along the juncture. The edges may be planar or an alternate shape to assist in providing a seal, such as tongue and groove. 
     One or both of junctures  254  may extend at a (non-zero) angle  270  to a plane  268  that is transverse to cyclone axis  232 . For example, as exemplified in  FIG. 5 , the juncture may extend axially (perpendicular to plane  268 ) or at an angle between 0° and 90° exclusive, as exemplified in  FIGS. 10 and 117-120 . 
     A sidewall first portion  248  that opens along junctures  254  angled in this way can provide an opening  256  into cyclone chamber  176 , which has an axial dimension and which has a greater cross-sectional area than opening the end wall of a cyclone, thereby providing better access to dirt and debris contained inside cyclone chamber  176 . In contrast, an cyclonic air treatment member having only an end wall door, may require the user to reach their hand and arm through the open end wall door into the cyclone chamber to clear dirt and debris (e.g. accumulated or tangled on a vortex finder), which may be unpleasant for the user. 
     Sidewall first portion  248  may be moveably mounted with respect to sidewall second portion  252 , sidewall second portion  252  may be moveably mounted with respect to sidewall first portion  248  or both sidewall portions  248 ,  252  may be moveable with respect to each other. 
     In the illustrated example, junctures  254   1  and  254   2  extend axially parallel to cyclone axis  232 . When sidewall first portion  248  is moved relative to sidewall second portion  252  to separate sidewall first portion  248  from sidewall second portion  252  along junctures  254 , the resulting cyclone chamber opening  256  extends axially (i.e. along an axial length of cyclone chamber  176 ). An advantage of this design is that the axial dimension of cyclone chamber opening  256  provides a large opening  256  and thereby improves user-access to dirt and debris that may be located throughout cyclone chamber  176 . For example, when sidewall first portion  248  is moved to the open position, cyclone chamber opening  256  may allow user access to debris at both cyclone chamber ends  240 ,  244  without having to unpleasantly reach a length of their arm into the dirty and dusty cyclone chamber  176 . 
     Sidewall first portion  248  may be movably mounted with respect to sidewall second portion  252  in any manner that allows sidewall first portion  248  to move between a closed position ( FIG. 1 ) and an open position ( FIGS. 5-6 ). For example, sidewall first portion  248  may be rotatable (e.g., as exemplified in  FIGS. 27-30 ), pivotable (as exemplified in  FIGS. 5 and 14 ), translatable (as exemplified in  FIG. 31 ), or any combination thereof, relative to sidewall second portion  252 . 
     Referring to  FIGS. 5-6 , sidewall first portion  248  is pivotable relative to sidewall second portion  252 . As exemplified, sidewall first portion  248  is connected to cyclone  170  by a hinge  272  that defines a rotation axis  276  (sometimes referred to as a ‘pivot axis’). 
     Rotation axis  276  may have any position suitable to allow sidewall first portion  248  to pivot relative to sidewall second portion  252  between the closed and open positions. For example, rotation axis  276  may be positioned external to cyclone chamber  176  as shown, or rotation axis  276  may extend through cyclone chamber  176 . As shown, positioning rotation axis  276  external cyclone chamber  176  can allow hinge  272  to be located outside of cyclone chamber  176 , such that hinge  272  does not interfere with air flow through cyclone chamber  176  and does not occupy space within cyclone chamber  176 . Rotation axis  276  may also be located at any location along the axial length of the cyclone. For example, axis  276  may be located at one end of the cyclone chamber as exemplified in  FIG. 5 , or at an intermediate location along the length of the cyclone sidewall. 
     Rotation axis  276  may have any orientation suitable to allow sidewall first portion  248  to pivot relative to sidewall second portion  252  between the closed and open positions. For example, rotation axis  276  may be oriented transverse to cyclone axis  232  (see, e.g.,  FIG. 5 ), or rotation axis  276  may extend axially (e.g. parallel to cyclone axis  232 , see e.g.,  FIG. 14 ). An advantage of the design of  FIG. 5  is that the end of sidewall first portion  248  distal to axis  276  may rotate farther away from sidewall second portion  252  in the open position per degree of rotation. Accordingly, rotation axis  276  positioned and oriented as shown may provide greater user access to a lower end of the interior of cyclone chamber  176  to remove the contained dirt and debris. 
     Hinge  272  may be any device suitable to (directly or indirectly) connect sidewall first portion  248  to sidewall second portion  252  and allow sidewall first portion  248  to rotate relative to sidewall second portion  252  between the closed and open positions. For example, hinge  272  may have a multi-part design as shown, or hinge  272  may be a single-part living hinge. As compared to a single-part living hinge  272 , a multi-part hinge  272  typically provides greater strength and working life (e.g. number of rotations before failure). A single-part living hinge  272  allows chamber first end  240  to be integrally formed with cyclone  170 , which reduces the number of components, which in turn can reduce manufacturing and assembly costs. 
     Referring to  FIGS. 1, 5, and 6 , a cyclone chamber opening  256  may have an area  280  that is larger than an opening provided by an openable door at cyclone end wall  244 . For example, opening area  280  may be greater than a cross-sectional area  284  measured on a plane  268  that is perpendicular to cyclone axis  232 . The comparatively larger opening area  280  provides greater user access to remove dirt and debris from an interior of cyclone chamber  176  as compared to an end wall door. In some embodiments, opening area  280  may be at least 120% (e.g. 120% to 500%) of chamber cross-sectional area  284 . In the illustrated example, the opening area  280  of each cyclone chamber opening  256  is at least 200% of chamber cross-sectional area  284 . 
     Referring to  FIGS. 5-6 , one or more parts of cyclone chamber  176  or dirt collection chamber  172  may be movable with sidewall first portion  248  to the open position. This can allow those part(s) to be reoriented in the open position in a way that provides greater user access to dirt and debris collected on those part(s), and/or that allows dirt and debris collected on those part(s) to fall out of chamber(s)  172 ,  176  by gravity (e.g. into a waste bin below). In general, the more dirt and debris that falls out of chamber(s)  172 ,  176  by gravity alone, results in less unpleasant user-contact with dirt and debris to clean out chamber(s)  172 ,  176 . 
     In the illustrated example, cyclone chamber second end wall  244  is connected to sidewall first portion  248  so that cyclone chamber second end wall  244  rotates with sidewall first portion  248  to the open position. This tilts the surface of cyclone chamber second end wall  244  towards an axial (e.g. vertical) orientation, which can allow dirt and debris collected on cyclone chamber second end wall  244  to fall out of chambers  172 ,  176  by gravity. This also removes cyclone chamber second end wall  244  from sidewall second portion  252  so that dirt and debris associated with sidewall second portion  252  can fall out of chambers  172 ,  176  by gravity instead of forming a pile on cyclone chamber second end wall  244  at the bottom end. 
     In an alternative embodiment, cyclone chamber second end wall  244  may remain with sidewall second portion  252  when sidewall first portion  248  is moved to the open position. 
     In any embodiment, cyclone chamber second end wall  244  may be openable, e.g., it may be pivotally mounted to one of the sidewall portions  248 ,  252 . 
     As mentioned previously,  FIGS. 10-11 and 117-120  exemplify an embodiment wherein the juncture extends at an angle between 0° and 90° exclusive to transverse plane  268 . The sidewall portions  248 ,  252  meet along a sidewall juncture  254  in the closed position ( FIGS. 10, 117 and 119 ) and may be pivoted away from each other to the open position ( FIGS. 11, 118 and 120 ). In the open position, edges  260  of sidewall portions  248 ,  252  are spaced apart, and each sidewall portion  248 ,  252  has a cyclone chamber opening  256 . 
     In accordance with this embodiment, sidewall juncture  254  forms (non-zero) angles to both cyclone axis  232  and transverse plane  268 . Accordingly, sidewall juncture  254  has an axial extent or dimension that creates comparatively large area chamber openings  256  in the open position, but that does not extend axially parallel to cyclone axis  232 . As compared to a sidewall juncture that is parallel to cyclone axis  232 , the illustrated sidewall juncture  254  has a shorter linear length, which may result in less cost, less complexity, and greater reliability in maintaining an air tight seal along sidewall juncture  254  in the closed position. 
     Sidewall juncture  254  may be located anywhere between cyclone chamber ends  240 ,  244 . Preferably, sidewall juncture  254  is spaced apart from cyclone chamber end  240 ,  244 . This positions sidewall juncture  254  more centrally between cyclone chamber ends  240 ,  244  whereby in the open position, the maximum distance from cyclone chamber openings  256  to an interior surface of cyclone chamber  176  is reduced. For example, sidewall juncture  254  may be spaced from cyclone chamber first end  240  by a distance  336 , spaced from cyclone chamber second end  244  by a distance  340 , and each of distances  336  and  340  may be at least 10%, 20%, 30%, 40% or 50% (e.g. 10% to 50%, 20% to 40%) of cyclone chamber height  320 . 
     Still referring to  FIGS. 10-11 , sidewall juncture  254  has a first end  344  having a first axial position, a second end  348  having a second axial position, and some or all of screen  212  has an axial position located between the axial positions of the sidewall juncture ends  344 ,  348 . As shown in  FIG. 11 , this can allow some or all of screen  212  to extend out of a cyclone chamber opening  256  when the cyclone is in the open position, which can provide easy user-access to surfaces of screen  212  for cleaning. 
     As with the embodiment of  FIGS. 5 and 6 , cyclone second end  244  may be a movable (e.g. pivotable, translatable, and/or removable) end wall  352 . As exemplified, cyclone second end  244  includes an openable door  352 . Door  352  can be opened to empty the majority of loose dirt and debris contained in cyclone chamber  176 . This can mitigate loose dirt and debris spilling uncontrollably when moving sidewall first portion  248  to the open position. An openable door  352  may be provided at one or both ends of the cyclone and, e.g., may be pivotally connected to one or both of sidewall portions  248 ,  252 . In the illustrated example, openable door  352  is pivotally connected by a hinge  356  to sidewall first portion  248 , and a latch  360  is provided to removably secure openable door  352  closed. 
     As mentioned previously,  FIG. 14  exemplifies an axially extending pivot axis  276 . An advantage of this design is that in the open position, each sidewall portion is opened and the cyclone chamber openings  256  may extend the full axial length of cyclone chamber  176 . This provides easy user-access to dirt and debris located anywhere inside of cyclone chamber  176 . It will be appreciated that the hinge may extend along only part of the axial length of the sidewall. 
     Sidewall portions  248 ,  252  can have any circumferential angular extent. For example, sidewall first portion  248  may have a circumferential angular extent of between 25° and 335°. More preferably, the circumferential angular extent may be more balanced as between sidewall portions  248 ,  252  so that each sidewall portion  248 ,  252  has a conveniently large cyclone chamber opening  256  in the open position. For example, the circumferential angular extent of sidewall first portion  248  may be between 135° and 225°. In the illustrated example, both sidewall portions  248  have an angular extent of about 180°. This provides each sidewall portion  248 ,  252  with a similarly large cyclone chamber opening  256 . 
     Sidewall first portion  248  may be pivotally mounted about an axial rotation axis  276 . This allows cyclone  170  to have a relatively smaller footprint when in the open position so that all of cyclone  170  can be underlied by a standard sized waste bin that is collecting dirt and debris falling from cyclone  170 . In the illustrated example, rotation axis  276  is parallel to cyclone axis  232 . In some embodiments, sidewall hinge  272  is a piano hinge that is provided on an exterior of the sidewall and extends axially along sidewall portions  248 ,  252 . 
     Hinge  272  may extend from one end of the cyclone chamber to the other end of the cyclone chamber as exemplified in  FIG. 14 , or it may extend along only part of the axial length. For example, it may extend from one end of the cyclone chamber towards the other end or it may extend along only part of an intermediate section of the sidewall between the first and second axially opposed cyclone ends. In such a case, the sidewall portion that opens may define a door having upper and lower ends that mate with the other sidewall portion along upper and lower edges that extend around a portion of the perimeter of the sidewall. 
       FIGS. 19-21  exemplify an alternate embodiment wherein the axis  276  extends in the direction of the cyclone axis of rotation  232  but wherein the axis  276  extends through the cyclone chamber. Optionally, as exemplified, rotation axis  276  is coaxial or collinear with cyclone axis  232 . Sidewall first portion  248  is rotatable about axis  276  relative to sidewall second portion  252  from a closed position to an open position ( FIG. 20 ) in which sidewall portions  248 ,  252  are partially or completely nested with one another. For example, sidewall first portion  248  may nest within sidewall second portion  252  as shown, or vice versa. An advantage of this design is that it may provide even greater exposure to interior surfaces of cyclone chamber  176 . Further, this design may reduce the time and effort required to clean out cyclone chamber  176  because the act of nesting one sidewall portion into the other may empty the outer sidewall portion into the inner sidewall portion or out of cyclone chamber  176 . Thus, the user may have only to attend to emptying dirt and debris associated with the inner sidewall portion. Also, an open position in which sidewall portions  248 ,  252  are nested may reduce the footprint of cyclone chamber  176 , which may make it possible or easier to empty cyclone chamber  176  into a waste bin below without spilling. 
     Each sidewall portion  248 ,  252  is exemplified as an axial cylindrical segment. In the example shown, each sidewall portion  248 ,  252  has a circumferential angular extent of approximately 180°. This allows the sidewall portions  248 ,  252  to completely nest with each other in the open position ( FIG. 20 ). In other embodiments, the circumferential angular extent of each sidewall portion  248 ,  252  may differ from 180°. For example, the inner sidewall portion  248  may have an angular extent of greater than or less than 180°. 
     It will be appreciated that cyclone chamber sidewall  236  may include any number of sidewall portions, which are mounted so that they can move relative to each other between a closed position and an open position. Accordingly, while  FIGS. 20-21  show an embodiment in which cyclone chamber sidewall  236  includes two sidewall portion  248 ,  252  that are each an axial cylindrical segment, and which are nested in the open position ( FIG. 21 ), a larger number of segments may be provided. This may permit cyclone chamber  176  to have an open position that provides even greater user-access to the interior volume, surfaces, and contents of cyclone chamber  176 . In turn, this may make it easier for the user to clean cyclone chamber  176  of dirt and debris. 
     For example,  FIGS. 27-30  show an example including three sidewall portions  248 ,  252 ,  388 , each of which is an axial cylindrical segment, and which are nested in the open position ( FIG. 30 ). Sidewall portions  248 ,  252 ,  388  may have the same circumferential angular extent as shown (e.g. approximately 120°), or one or more (or all) of sidewall portions  248 ,  252 ,  388  may have a different circumferential angular extent as compared to each other sidewall portion  248 ,  252 ,  388 . As shown, the larger number of sidewall portions  248 ,  252 ,  388  may result in a larger portion of cyclone outlet passage  208  being located outside of cyclone chamber  176  when in the open position, even where cyclone outlet passage  208  is not movably mounted (i.e. where cyclone outlet passage  208  is rigidly connected to cyclone  170 ). In the illustrated example, cyclone chamber  176  spans approximately 120° in the open position such that approximately 240° (i.e. about two thirds) of cyclone outlet passage  208  is positioned outside of cyclone chamber  176 . 
     As mentioned previously,  FIGS. 31-32  exemplify an embodiment in which sidewall first portion  248  is axially translatable to the open position as shown. Depending on the manner in which cyclonic air treatment member  116  is connected to the surface cleaning apparatus, this design may prevent cyclone chamber  176  from being opened while connected to the surface cleaning apparatus. As shown, sidewall portions  248 ,  252  may meet (e.g. be sealed) at first and second junctures  254 . First juncture  254   1  may be parallel to second juncture  254   2  and angularly spaced around cyclone chamber  176  from second juncture  254   2 . In the example shown, both junctures  254  extend axially (e.g. parallel to cyclone axis  232 ). 
       FIG. 34  exemplifies an embodiment in which sidewall first portion  248  is an axial cylindrical segment, which is pivotally mounted to cyclone  170  so that it can rotate about a rotation axis  276 , which is transverse (e.g. perpendicular) to cyclone axis  232 . 
     Moveable Screen 
     The following is a discussion of a moveable screen, which may be may be used by itself or with one or more of the cyclone with an openable sidewall, the dual end walls, the medial cyclone air inlet, the exterior dirt collection chamber the axially extending member (vertically extending screen), and the dirt ejection mechanism. 
     As exemplified in  FIGS. 5-6 , cyclone  170  may include a cyclone outlet passage (e.g. vortex finder)  208  including a porous member, which may be referred to as a screen or shroud  212 , that may collect larger dirt particles and debris (e.g. hair) which remains entrained in the air flow exiting the cyclone  170 . When sidewall first portion  248  is in an open position, a portion of screen  212  may remain in close proximity to one of sidewall portions  248 ,  252 , and that proximity may make user access to clean that portion of screen  212  difficult (e.g. the clearance may be too small for a user&#39;s fingers). In some embodiments, cyclone outlet passage  208  may be movably mounted with respect to one or both of the sidewall portions  248 ,  252 . This can allow the user better access to clean surfaces of screen  212 . 
     In accordance with this aspect, the cyclone outlet passage (e.g. vortex finder)  208  is moveable so as to permit easier access to more of the perimeter of the outlet passage and, optionally, all of the perimeter of the outlet passage. 
     Cyclone outlet passage  208  may be movably mounted with respect to one or both sidewall portions  248 ,  252  in any manner suitable to improve user-access to some or all of the outer surface of screen  212 . For example, cyclone outlet passage  208  may be removable from cyclone  170 , or cyclone outlet passage  208  may be rotatable, translatable, or both while remaining connected to cyclone  170 . 
     As exemplified in  FIGS. 5-6 and 7-9 , cyclone outlet passage  208  is movably mounted with respect to both sidewall portions  248 ,  252 . As shown, when sidewall first portion  248  is moved to the open position, cyclone outlet passage  208  is movable away from sidewall portion  252 , concurrently, or subsequently, outlet passage  208  may be moved away from sidewall portion  248 . This increases the clearances between screen  212  and both sidewall portions  248 ,  252 , which can greatly improve user-access to clean surfaces of screen  212 . 
     In the illustrated example, cyclone outlet passage  208  is pivotable about a rotation axis  288  relative to sidewall portion  248 . As shown, this allows cyclone outlet passage  208  to rotate away from sidewall portion  248  when in the open position. Accordingly, when the sidewall portions are pivoted open and the screen is pivoted to the open position shown in  FIG. 6 , clearances  292 ,  296  between screen  212  and sidewall portions  248 ,  252  respectively increase to provide greater user-access to the outer surface of screen  212  for cleaning. See also  FIG. 33 . 
     In the example shown, cyclone outlet passage  208  is pivotally connected to sidewall first portion  248 . Alternatively, cyclone outlet passage  208  may be pivotally connected to sidewall second portion  252  or to another portion of cyclone  170 . 
       FIG. 12  exemplifies an alternate embodiment wherein cyclone outlet passage  208 , including screen  212 , is removable from cyclone  170  after sidewall first portion  248  is moved to the open position. This can allow cyclone outlet passage  208  to be most easily cleaned, and optionally replaced if it is a consumable item or damaged. 
       FIG. 13  exemplifies an embodiment in which cyclone outlet passage  208 , including screen  212 , is translatable relative to sidewall portions  248 ,  252 . As shown, cyclone outlet passage  208  may be translatably connected to one of the sidewall portions, e.g., sidewall portion  252 , whereby cyclone outlet passage  208  can move along track  364  through cyclone chamber opening  256 . This moves screen  212  out of cyclone chamber  176  so that it can be easily cleaned of dirt and debris by the user. 
     As exemplified in  FIGS. 14-16 , cyclone outlet passage  208  (including screen  212 ) may be pivotable about an axial screen rotation axis  372 . As shown, this design allows cyclone outlet passage  208  to be rotated out of the cyclone chamber to provide easy user-access to surfaces of screen  212  for cleaning. In this example, screen rotation axis  372  is shown as parallel to cyclone axis  232 . In other embodiments, screen rotation axis  372  may be oriented at a (non-zero) angle to cyclone axis  232 . A similar design is useable in the embodiment of  FIG. 26 . 
     Dual End Walls 
     The following is a discussion of dual end walls, which may be may be used by itself or with one or more of the cyclone with an openable sidewall, the moveable screen, the medial cyclone air inlet, the exterior dirt collection chamber the axially extending member (vertically extending screen), and the dirt ejection mechanism. 
     An advantage of this design is that each openable sidewall portion may have part of the end wall  244 . This can facilitate sealing the cyclone chamber when the sidewall portions are in the closed position. 
     As exemplified in  FIG. 14 , half of the end wall  244  may be fixedly mounted to each sidewall portion  248 ,  252 . 
     Alternately, as exemplified in  FIGS. 16-17 , each end wall portion may be openable. As exemplified therein, cyclone chamber  176  may include an openable end wall  352  at chamber second end  244 . As shown, openable end wall  352  may include a first wall portion  376  movably (e.g. pivotally) connected to sidewall first portion  248  and a second wall portion  380  movably (e.g. pivotally) connected to sidewall second portion  252  as shown. An advantage of this design is that upon opening end wall  352  to empty dirt and debris from cyclone chamber  176  into a waste bin below, the end wall portions  376 ,  380  may tend to funnel the falling dirt and debris into a waste bin below. This may mitigate the dirt and debris spilling laterally outside of the waste bin upon opening end wall  352 . 
       FIGS. 19-21  exemplify the use of two end wall segments in a rotational opening design. As shown, in the open position ( FIG. 20 ), end wall portion  376  may overlie end wall portion  380 . As compared with an end wall  352  that remains whole (e.g. if the design of end wall  352  of  FIG. 18  were used and end wall  352  was mounted in a fixed position to a sidewall portion), this design may reduce the effective surface area of end wall  352  in the open position so that dirt and debris can fall out of cyclone chamber  176  more easily. Furthermore, this design may make cleaning cyclone chamber  176  easier in that the act of moving wall second portion  380  under wall first portion  376  may automatically push dirt and debris collected on wall second portion  380  out of cyclone chamber  176 . 
       FIG. 24  exemplifies the use of two end wall segments in a rotational opening design wherein door portions  376 ,  380  are separately openable. 
     Medial Cyclone Air Inlet 
     The following is a discussion of a cyclone with a medial cyclone air inlet, which may be may be used by itself or with one or more of the cyclone with an openable sidewall, the moveable screen, the dual end walls, the exterior dirt collection chamber the axially extending member (vertically extending screen), and the dirt ejection mechanism. 
     Optionally, the cyclone air inlet may be located in a medial position between the first cyclone end and the second cyclone end, and may be provided on the cyclone sidewall (e.g., the cyclone inlet may be a tangential air inlet terminating at a port in the sidewall). Accordingly, dirty air may enter the medial inlet, and may flow inside of the cyclone chamber in two directions: (a) axially toward the first cyclone end, and (b) axially toward the second cyclone end. An advantage of this configuration is that cyclonic action is promoted in both the upper and lower portions of the cyclone unit, which may tend to improve the dirt separation efficiency of the cyclone unit. 
     Optionally, a flange may extend at least part way around the inner surface of the cyclone sidewall to overlie or underlie the medial cyclone air inlet. In various cases, the flange may control (e.g., limit) the volume of air flowing axially (e.g., upwardly or downwardly if the first cyclone end is positioned over the second cyclone end) inside of the cyclone chamber. The flange may be placed at an axial end of the cyclone inlet, or it may be spaced therefrom. 
     In the drawings, the cyclone is oriented with the first cyclone end positioned over the second cyclone end. Accordingly, the cyclone is oriented vertically and the portions of the cyclone may consequentially be referred to as upward or above or downward or below and the flow of the air may consequentially be referred to as upwardly or downwardly. It will be appreciated that the cyclone may be oriented, and used, in various orientations. 
     Referring now to  FIG. 38 , as exemplified, the first cyclone end  240  may be positioned over the second cyclone end  244 . In this configuration, the axial height  320  of the cyclone unit  170  may be divided into three portions: an upper portion  320   a , a lower portion  320   b , and a medial portion  320   c  located between the upper and lower portions  320   a ,  320   b.    
     The upper and lower portions  320   a ,  320   b  may comprise any relative proportions of the axial height  320  of the cyclone unit  170 . For example, each of the upper and lower portions may comprise 10%, 15%, 20%, or 25% of the total axial height  320  of the cyclone unit  170 . Accordingly, the medial portion may comprise 80%, 70%, 60% or 50% of the remaining axial height  320  of the cyclone unit  170 , respectively. 
     As exemplified in  FIGS. 36 to 41 , the cyclone air inlet  196  may be located laterally (e.g., it may be a tangential air inlet) on the side wall  236  of the medial portion  320   c . Accordingly as best exemplified by  FIG. 38 , air entering the cyclone chamber  176  via the medial inlet  196  flows (e.g., travels) in two directions: (a) axially upwardly toward the first cyclone end  240 , and (b) axially downwardly toward the second cyclone end  244 . In this manner, rotational upflow cyclone action (or inverted cyclone action) is induced in the upper cyclone portion  320   a , and rotational down flow cyclone action is induced in the lower cyclone portion  320   b . In various cases, this may help to increase the dirt separation efficiency of the cyclone unit. For example, finer or less dense particles of dust and dirt may travel upwardly into the upper cyclone portion  320   a  to be ejected into the external dirt chamber  172   b , while coarser or denser particles of dust and dirt may travel downwardly into the lower cyclone portion  320   b  to aggregate inside of the lower end of the cyclone chamber, e.g., an internal dirt collection chamber  172   a.    
     The cyclone air inlet, which in this aspect may be referred to as a medial air inlet or medial inlet  196 , may be provided at any location within the medial portion  320   c . For instance, the medial inlet  196  may be provided in an axially upper portion of the medial portion  320   c  (see e.g.,  FIG. 38 ), a middle portion of the medial portion  320   c  (e.g.,  FIG. 80 ), or a lower portion of the medial portion  320   c  (see e.g.,  FIG. 45 ). 
     Optionally, the medial inlet  196  is located below a location at which air may exit the cyclone chamber. Accordingly, the upper end of the medial inlet  196  may be positioned below the cyclone outlet passage  208  and/or the shroud  212 , or at least adjacent an axially inward end  212   a  of the shroud  212 . If the axial inward end  212   a  is solid (e.g., i.e., no air flow passes therethrough), then the medial inlet  196  may be positioned adjacent or below the porous portion of the screen  212 . 
     It will be appreciated that while only a single medial inlet  196  has been illustrated in the exemplified embodiments, in other embodiments, more than one medial inlet  196  may be provided inside of the cyclone chamber  170 . For example, two or more medial inlets  196  may be vertically spaced along the cyclone sidewall  236 . Alternatively, or in addition, two or more medial inlets  196  may be spaced along the perimeter of the cyclone sidewall  236 . 
     Optionally, as best exemplified in  FIGS. 39, 42 and 44 , a flange  392  may extend around at least a portion of the inner surface of the cyclone sidewall  236 , and may extend inwardly, and optionally radially inwardly into the cyclone chamber  176 . The flange  392  may be formed of any suitable material, including resilient material. For example, the flange may be made of the same material as the cyclone sidewall and may be molded as part thereof, 
     In the exemplified embodiments, the flange  392  is positioned axially above the medial inlet  196 , and preferably, axially below the cyclone outlet  208  and/or the shroud  212 . Without being limited by theory, in this configuration, the flange  392  blocks or inhibits some of the upward air flow into the cyclone chamber  196  from the medial inlet  196 . In other words, the flange  392  may control the volume of air entering the upper cyclone portion  320   a . An advantage of this configuration is that, by limiting the upward air flow, the flange  392  may assist in a larger portion of the air travelling into the lower cyclone portion  320   b  and/or block larger dirt particles from being drawn upwardly into the upper portion  320   a . Accordingly, the flange  392  may increase the dirt separation efficiency of the cyclone unit  170 . 
     Alternatively, or in addition, a flange may be located axially below the medial inlet  196  (not shown). In this configuration, the flange may inhibit (e.g., block) the downward flow of air into the lower cyclone portion  320   b.    
     As exemplified, the flange  392  may extend by any suitable distance around the inner perimeter of the cyclone side wall  236 . For example, the flange  392  may extend entirely around the inner surface of the cyclone sidewall  236  to define a central opening (e.g.,  FIGS. 44C, 44D, 44G, 44H ). In other cases, the flange  392  may extend around only a portion of the inner surface of the cyclone side wall  236  (e.g.,  FIGS. 44A, 44B, 44E, 44F ). For instance, the flange  392  may extend around only a third or a half of the way around the inner perimeter of the cyclone sidewall. 
     The flange  392  may also extend radially inwardly into the cyclone chamber  176  by any variable distance. For example, the flange  392  may have a maximum radial width  394  of 3 mm (see e.g.,  FIGS. 44C and 44D ) or 6 mm (see e.g.,  FIGS. 44G and 44H ). An advantage of a flange  392  having a greater radial width  394  is that the flange  394  may block a greater volume of air from entering the upper cyclone portion  320   a . In contrast, an advantage of a flange  392  having a smaller radial width  394  is that a smaller volume of air is blocked from flowing into the upper cyclone portion  320   a . In particular, as more air is permitted to flow upwardly into the upper cyclone portion  320   a , a lower volume of air reciprocally flows downwardly, into the lower cyclone portion  320   b.    
     As exemplified, the flange  392  may have a constant (e.g., uniform) radial width  394  (e.g.,  FIGS. 44C, 44D, 44G, 44H ), or may have a variable radial width  394  along different portions of the flange  392  (see e.g.,  FIGS. 44A, 44B, 44E, 44F ). 
     The radial width  394  of the flange  392  may also be fixed or adjustable. For instance, the radial width of the flange may be adjustable to be greater or smaller. For instance, the flange  392  may function similar to a rotatable iris diaphragm, such that the flange  392  may be rotated inwardly to increase the radial width  394 , and rotated outwardly to decrease the radial width  394 . Alternatively, or in addition, the flange  392  may be translated inwardly and outwardly of the cyclone chamber  176  to increase and decrease the radial width  394 , respectively. An advantage of an adjustable flange configuration is that the radial width may be changed to vary the air flow rate into the upper and lower cyclone portions, respectively. In some cases, an adjusting mechanism can be provided outside of the cyclone chamber  176  to facilitate adjusting of the radial width of the flange  392 . 
     In various embodiments, the flange  392  may also be configured to be planar or flat. 
     Alternately, or in addition, the flange may extend into the cyclone chamber in a plane that is transverse to the cyclone axis. In other embodiments, the flange may extend into the cyclone chamber at an angle to a plane that is transverse to the cyclone axis. 
     In other embodiments, the flange  392  may be in the form of a spiral of the like extending around part or all of the circumference of the cyclone sidewall. In embodiments where the flange  392  twists or rotates, the flange may spiral in the direction of cyclonic air flow, or counter the direction of cyclonic air flow. 
     Exterior Dirt Collection Chamber 
     The following is a discussion of an exterior dirt collection chamber, which may be may be used by itself or with one or more of the cyclone with an openable sidewall, the moveable screen, the dual end walls, the medial cyclone air inlet, the axially extending member (vertically extending screen), and the dirt ejection mechanism. 
     Optionally, a dirt collection chamber may be provided external to the cyclone unit chamber. Dust and dirt particles ejected into the external dirt chamber may be separated from the cyclonic air flow in the cyclone chamber and, accordingly, may be prevented from being re-entrained into the flow of air. This, in turn, may increase the dirt separation efficiency of the cyclone unit. In various cases, the external dirt chamber may collect finer particles of dust and dirt, while an internal cyclone dirt chamber may collect coarser particles of dust and dirt. 
     Referring now to  FIGS. 35-41, 48, 51, and 79-83 , as exemplified, the air treatment member  116  may include a dirt collection chamber  172   b  located external to the cyclone chamber  176 . The external dirt chamber  172   b  may collect finer particles of dust and dirt, which would not otherwise aggregate inside of the cyclone&#39;s internal dirt chamber  172   a.    
     As exemplified, the external dirt chamber  172   b  may be in fluid communication with the cyclone chamber  176  via one or more dirt outlets  178 . For instance, the dirt chamber  172   b  may communicate with the cyclone chamber  176  via one dirt outlet  178  (e.g.,  FIGS. 36-41 ), or two dirt outlets  178   a ,  178   b  spaced apart (e.g.,  FIGS. 79-83 ). 
     The dirt outlets  178  may be located in any position along the cyclone unit  170 . For instance, the dirt outlets  178  may be laterally positioned along the cyclone side wall  236 —e.g., between the first and second cyclone ends  240 ,  244 —to communicate with a laterally positioned dirt collection chamber  172   b . In this configuration, the dirt outlets  178  comprise slots which have any suitable axial height and which extend around at least a portion of the perimeter of the cyclone side wall  236 . In the exemplified embodiments, the dirt outlets  178  are positioned toward the first cyclone end  240 , and axially above the medial inlet  196 . An advantage of this configuration is that the dirt outlets  178  are positioned to receive finer particles of dust and dirt carried upwardly by the upflow of air from the medial inlet  196 . In other cases, the dirt outlet  178  can also be positioned at any other location along the axial height  320  of the cyclone unit  170 , including at the mid-point of the cyclone unit. 
     As exemplified, the external dirt chamber  172   b  may be laterally positioned relative to the cyclone sidewall  236 . In this configuration, when the first cyclone end  240  is positioned over the second cyclone end  244 , the dirt chamber  172   b  can be sized so as to not increase the axial height of the cyclone unit  170 . Alternately, some of the dirt chamber  172   b  may be provided above or below the cyclone unit  170 . 
     The dirt chamber  172   b  may partially or fully surround the lateral side of the cyclone chamber  176 . For example, the dirt chamber may be located on the side of the cyclone chamber, which is provided with the dirt outlet. If more than one cyclone dirt outlet is provided, then the dirt outlets may be in communication with a common external dirt chamber or they may each be in communication with a single external dirt chamber. 
     As exemplified, the external dirt chamber  172   b  may extend between a first end  172   b   1  and an axially spaced apart second end  172   b   2 . The axial distance between the first and second ends may define the axial height (e.g., depth)  402  of the dirt chamber  172   b . Preferably, the dirt chamber  172   b  extends axially along an axis, which is substantially parallel to the cyclone axis  232 . In other cases, however, the dirt chamber  172   b  may extend along any other suitable axis. 
     The height or depth  402  of the dirt chamber  172  may be variably configured. For example, the dirt chamber  172   b  may have an axial height  402  which is approximately ⅓ rd  of the cyclone height  320  (e.g.,  FIG. 37 ), ½ of the cyclone height (e.g.,  FIG. 83 ), ⅔ rd  the cyclone height (e.g.,  FIG. 35 ), or substantially equal to the cyclone axial height (e.g.,  FIGS. 79-81 ). As stated previously, an advantage of a dirt chamber  172   b  having an axial height which is less than or equal to the cyclone height  320  is to limit the extent to which the depth (e.g., height) of the cyclone unit is increased. In other cases, however, the dirt chamber  172   b  may have an axial height which is greater than the cyclone unit height. For instance,  FIGS. 111-113  exemplify an embodiment where the axial height of the external dirt chamber  172   b  is greater than the cyclone unit  170 . As exemplified, when first cyclone end  240  is positioned above the second cyclone end  244 , the dirt chamber  172   b  extends to a position below the cyclone chamber. In still yet other cases, different portions of the external dirt chamber  172   b  may have different axial heights. 
     As exemplified, the dirt chamber ends  172   b   1  and  172   b   2  may be positioned in any location relative to the cyclone chambers ends  240 ,  244 . For instance, in some cases, the first dirt chamber end  172   b   1  may be substantially flush with the first cyclone end  240  (e.g.,  FIGS. 36, and 111A ). An advantage of this configuration is that the first cyclone end  240  may be concurrently openable with the first dirt chamber end  172   b   1 , as explained in further detail herein. For example, the first cyclone end  240  and the first dirt chamber end  172   b   1  may be a common member (e.g., a single openable end wall). In other embodiments, the first dirt chamber end  172   b   1  may be axially offset from the first cyclone end  240 . In either case, preferably, the first dirt chamber end  172   b   1  is positioned at, or proximal to, the dirt outlet  178 . In this manner, dirt is ejected into the top of the dirt chamber  172   b , and can fall downwardly to the second dirt chamber end  172   b   2  (assuming the first chamber end  172   b   1  is positioned above the second chamber end  172   b   2 ). 
     Similarly, the second chamber end  172   b   2  can be substantially flush with the second cyclone end  244  (e.g.,  FIG. 79 ), slightly axially offset from the second cyclone end (e.g.,  FIG. 81 ), or substantially axially offset from the second cyclone end (e.g.,  FIG. 37 , and  FIG. 111A ). In cases where the second dirt chamber end  172   b   2  is substantially flush with the second cyclone end  244 , or slight axially offset, the second cyclone end  244  may be concurrently openable with the first dirt chamber end  172   b   2 . For example, the second cyclone end  244  and the first dirt chamber end  172   b   2  may be a common member (e.g., a single openable end wall). 
     As discussed previously, optionally, one or both of the dirt chamber ends  172   b   1 ,  172   b   2  is openable to allow cleaning and emptying of the dirt collection chamber  172   b . Optionally, the dirt chamber ends  172   b   1 ,  172   b   2  are concurrently openable with a respective first or second cyclone end  240 ,  244  to allow concurrent cleaning and emptying of the cyclone chamber and the dirt collection chamber. 
     For instance, as exemplified in  FIG. 48 , the first chamber end  172   b   1  may be flush with the first cyclone end  240 , and the two chambers may be concurrently openable via a single openable top lid  390 . Similarly, the second dirt chamber end  172   b   2  may be concurrently openable with the second cyclone end  244 . For instance, as exemplified in  FIGS. 79-82 , the second chamber end  172   b   1  may be located in the same plane as the second cyclone end  244  (e.g.,  FIGS. 79 and 80 ), or slightly axially offset (e.g.,  FIGS. 81 and 82 ), and may share a common door  352 . Opening a single door (e.g., door  352 ) may allow concurrent cleaning and emptying of both the external dirt chamber  172   b  and the internal cyclone dirt chamber  172   a . In other cases, as exemplified in  FIGS. 37-40 , the dirt collection chamber  172  may have a separate door  352   b  for independently emptying and cleaning the dirt chamber  172   b . For example, this configuration may be more suitable where the second dirt chamber end  172   b   2  is substantially axially offset from the second cyclone end  244  (e.g.,  FIGS. 37-40 ). 
     While only a single dirt chamber  172   b  has been exemplified in the illustrated embodiments, it will be appreciated that the air treatment member  116  may also include more than one external dirt chamber  172   b . For example, two or more dirt chambers  172   b  may be in communication with the cyclone chamber  176 . The two or more dirt chambers may be positioned, for example, on different lateral sides of the cyclone unit  170 , or on the same lateral side of the cyclone unit  170  (e.g., vertically stacked). The two or more dirt chambers may communicate with the cyclone chamber  176  via separate dirt outlets  178 , or via a single common dirt outlet. Where the cyclone unit  170  includes more than one cyclone stage (e.g.,  168   1  and  168   2  in  FIG. 89 ), each cyclone stage may also communicate with a separate external dirt chamber, or the cyclone stages may communicate with a single external dirt chamber (e.g., via separate dirt outlets). 
     Axially Extending Member (or Axially Extending Screen) 
     The following is a discussion of an axially extending member (which may be an axially extending screen), which may be may be used by itself or with one or more of the cyclone with an openable sidewall, the moveable screen, the dual end walls, the medial cyclone air inlet, the exterior dirt collection chamber, and the dirt ejection mechanism. 
     In accordance with this aspect, the cyclone chamber and/or the external dirt chamber may be provided with an axially extending member  304  which may be planar and which may be porous. The axially extending member  304  may be provided inside the cyclone chamber  176  (e.g. the dirt collection region  172   a  of the cyclone chamber  176 ) (see e.g.,  FIGS. 1-95B ), and/or can be provided inside of the external dirt collection chamber  172   b  (see e.g.,  FIGS. 96-100 ). The axially extending member may also be referred to herein as a “vertically extending member” (or a “vertical screen” if the vertically extending member is porous) when the first cyclone end  240  is positioned over the second cyclone end  244 , or when the first external dirt chamber end  172   b   1  is positioned over the second external dirt chamber end  172   b   2 . 
     Axially extending member  304  may help to dis-entrain dirt and debris from the air flow. Alternatively or in addition, axially extending member  304  may help to prevent dirt and debris being re-entrained into the air flow inside the cyclone chamber  176  (e.g. inside the dirt collection region  172   a  of the cyclone chamber  176 ), and/or the external dirt chamber  172   b.    
     Axially extending member  304  can have any configuration suitable for providing one or both of these functions. For example, axially extending member  304  may include a thin panel (e.g., a plate) which may be solid, or at least partially provided with a plurality of small apertures. The axially extending member  304  may also comprise a coarse or fine screen, or any other suitable high air permeability physical filter media that can allow the air flow to continue circulating while providing some obstruction to dirt and debris and/or providing collecting surfaces for dirt and debris. 
     In the exemplified embodiments, the axially extending member  304  comprises a thin panel (e.g., plate) with a plurality of small apertures  306 . The axially extending member  304  may have any suitable number of apertures. For example, the axially extending member  304  may include at least 50 apertures, such as for example 50 to 5,000 apertures. The apertures  306  may have any suitable shape or configuration. For instance, the apertures may be circular or round (e.g.,  FIG. 64 ), oval (e.g.,  FIG. 65 ), rectangular (e.g.,  FIG. 66 ), triangular, square, and/or any combination of the aforementioned shapes (e.g.,  FIG. 67 ). In embodiments where the apertures are circular, the circular apertures may have a diameter of between 0.01″-0.5″, 0.04″-0.25″, or 0.06-0.125″. 
     The axially extending member  304  may have any variably configured axial height  308 , transverse width  312 , and thickness  316 . For example, in the exemplified embodiments, each of the axial height  308  and transverse width  312 , is far greater than its thickness  316 . An advantage of this design is that it provides axially extending member  304  with a large surface area (defined by height  308  and width  312 ) for obstructing and/or collecting dirt and debris, and a small volume so as to occupy only a small portion of cyclone chamber  176 . For example, each of height  308  and width  312  may be at least 500% (e.g. 500% to 100,000%) of the thickness  316 . As shown, height  308  may be 25% or more of cyclone chamber height  320  or the dirt chamber height  402  (e.g. 25% to 75% of cyclone chamber height  320 ), and width  312  may be 25% or more of cyclone chamber width  324  or the dirt chamber width ( FIG. 1 , e.g. 25% to 100% of cyclone chamber width  312 ). 
     The axially extending member  304  may be connected to one or more sidewall or end wall portions of the cyclone chamber  176  and/or the external dirt chamber  172   b . For example,  FIGS. 20-24, 32-34, 36-41  exemplify an embodiment where a vertical screen  304   a  is connected to the second cyclone end wall  352   a  (also referred to herein as a “vertical ‘end’ screen”  304   a , if the axially extending member that is attached to an end wall is porous). Similarly,  FIGS. 96-100  exemplify an embodiment where the vertical end screen  304   a  is connected to the second dirt chamber end wall  352   b .  FIGS. 37-39 and 48-51  exemplify an embodiment wherein the axially extending member  304  is connected to a sidewall. Accordingly, axially extending member  304  may be also referred to herein as a “vertical ‘side’ screen”  304   b , if the axially extending member that is attached to a sidewall is porous. 
     If the axially extending member is connected to the second cyclone end wall  352   a  and/or the second dirt chamber end wall  352   b , then the vertical end screen  304   a  may be removable from the cyclone chamber/dirt chamber when the second cyclone end wall  352   a  and/or the second dirt chamber end wall  352   b  is opened (see e.g.,  FIGS. 32, 40 and 41, 97-98, and 100-101 ). Alternately, if the vertical screen is attached to the inner surface of the cyclone sidewall  236  or dirt chamber sidewall rather than end wall  352   a  and/or  352   b , the vertical side screen  304   b  remains in position even when the second cyclone end  352  is openable. 
     As exemplified, any number of vertical side screens  304   b  may be provided inside of the cyclone chamber  176  and/or the dirt chamber. For example, there may be one vertical side screen (e.g.,  FIG. 52 ), two vertical side screens (e.g.,  FIGS. 37, 39, 41, 48, 53 ), three vertical side screens (e.g.,  FIGS. 54 and 55 ), four vertical side screens (e.g.,  FIG. 55 ), or five vertical side screens (e.g.,  FIG. 56 ). 
     Similarly, any number of vertical end screens  304   a  may be provided inside of the cyclone chamber  176  and/or the dirt chamber  172   b . For example, there may be one vertical end screen (e.g.,  FIGS. 64-71 ), two vertical end screens (e.g.,  FIG. 72 ), three vertical end screens (e.g.,  FIG. 75 ), or four vertical end screens (e.g.,  FIG. 73 ). In cases where more than one vertical end screen  340   a  is located inside of the cyclone unit  170  or external dirt chamber  172   b , the vertical end screens  340   a  may be spaced from each other (e.g.,  FIG. 72 ), or otherwise, connected or integrally molded to each other (e.g.,  FIGS. 73 and 75 ). Further, they may be the same or different. 
     Where more than one vertical side screen  304   b  is provided, the vertical side screens may be spaced in any manner inside of the cyclone chamber  176 . For instance, the vertical side screens  304   b  may be evenly spaced around the entire inner circumference of the cyclone side wall  236  (e.g.,  FIGS. 52, 54 and 55 ). In other cases, the vertical side screens  304   b  may be evenly spaced around only a portion of the inner circumference of the side wall  236  (e.g.,  FIGS. 56 and 57 ). In still other cases, the vertical side screens  304   b  may unevenly spaced around the inner circumference of the sidewall. In still yet other cases, rather than being spaced around the inner circumference of the sidewall, the vertical screens may be vertically (e.g., axially) stacked, and may be along a common plane. 
     Similarly, as exemplified, the vertical end screens  304   a  may be positioned at any location along the cyclone end wall  352   a  and/or the dirt chamber end wall  352   b . For example, the vertical end screens  304   a  may be positioned radially inwardly from the cyclone side wall  236  (e.g.,  FIG. 73-75 ) or dirt chamber side wall, or otherwise, proximal the cyclone side wall  236  (see e.g.,  FIGS. 69-71 ) or dirt chamber side wall. Similarly, they may be evenly spaced apart along the end wall of they may be provided on only a sector of the end wall. 
     The vertical side screens  304   b  may have any suitable shape or design. For example, the vertical side screen  304   b  may comprise an axially extending rectangular member (e.g.,  FIGS. 49 and 51 ), a trapezoidal member (e.g.,  FIG. 50 ), or a “shark fin” shaped member (e.g.,  FIG. 8 ). In some cases, the vertical screen  304   b  may have at least a portion which is slanted (e.g., angularly offset) (see e.g.,  FIG. 60 ). The slanted portion may be slanted, for example, in the direction of cyclonic air flow, or in a direction counter the direction of cyclone air flow. In still other embodiments, at least a portion of the vertical screen  304   b  may be arcuate or twisted or spiraled (e.g.,  FIG. 61 ). The twisted portion may have an angular twist in a range of 1°-720°, 10°-360°, or 30°-270°. The twisted portion may also twist in the direction of cyclonic air flow, or counter the direction of cyclonic air flow. 
     The vertical side screens  304   b  may be positioned at various axial elevations within the cyclone chamber  176 . For example, as exemplified in  FIGS. 49 and 51 , the vertical side screen  304   b  may be offset from the second cyclone end  244  by an axial offset distance  482   a . The offset distance  482  may be, for example, 0-35 times, 0.25-25 times, 1-15 times, or 2-5 times the axial height  196   a  of the cyclone inlet  196 . The axial elevation of the vertical screen  304   b  may also be expressed relative to the position of the shroud  212  (see e.g.,  FIGS. 49 and 51 ). For instance, the vertical side screen  304   b  may be axially offset from the axially inner end  212   a  of the shroud  212  by a distance  482   b  of 0-40 times, 0.5-25 times, 1-5 times, or 1-3 times the cyclone inlet height  196   a . In embodiments where more than one vertical screen  304   b  is located inside of the chamber  176 , the vertical side screens  304   b  may be positioned at the same axial elevation (see e.g.,  FIG. 51 ), or at different axial elevations. Preferably, in either case, the vertical side screens  304   b  are positioned at an axial elevation located below the cyclone air inlet  196 . 
     The side vertical screens  304   b  may radially extend into the cyclone chamber  176  by any variable distance. For instance, as exemplified in  FIGS. 44 and 49 , the vertical side screen  304   b  may have a radial extension  312   b  which spans substantially across the entire cyclone chamber  176 . In other cases, as exemplified in  FIGS. 52-57 , each vertical screen  304   b  may only partially extend into the cyclone chamber  176 . In cases where more than one vertical side screen  304   b  is provided, each vertical side screens  304   b  may have the same radial extension  312   b , or different radial extensions. 
     The vertical end screen  304   a  may have any suitable shape or design. Optionally, if the axially extending member is connected to the second cyclone end wall  352   a  and/or the second dirt chamber end wall  352   b , then the vertical end screen  304   a  may be configured such that when the second cyclone end wall  352   a ,  376 ,  380  is opened, or when the second external dirt chamber end wall  352   b  is opened, the vertical end screen  304   a  may be concurrently movable with the openable end wall  352   a ,  352   b ,  376 ,  380  to an open position (see e.g.,  FIGS. 32, 40 and 41, 97-98, and 100-101 ). In this manner, the vertical end screen  304   a  may be accessible for cleaning, and dirt and debris may be removed from the vertical end screen. In other cases, the vertical end screen  304   a  may not be concurrently moveable with an openable second cyclone or dirt chamber end wall, and may remain in-position when part or all of end wall  352 ,  376 ,  380  is opened (see e.g.,  FIGS. 23-24 ). 
     For example, as exemplified, if the end wall is pivotally mounted to the cyclone unit, then a portion of the vertical end screen may contact a part of the cyclone chamber sidewall and/or dirt chamber sidewall when the end wall is pivoted open. Accordingly, the side of the vertical end screen that is spaced furthest from the pivot axis of an openable end wall may be recessed sufficiently radially inwardly towards the side with the pivot axis such that the vertical end screen may be removed from the chamber without contacting the sidewall of the chamber. For example, the vertical end screen may be thin (see, e.g.,  FIGS. 71 a -71 c   ) and/or positioned offset radially inwardly towards the side of the end wall with the pivot axis (see, e.g.,  FIGS. 69 a -69 c , 70 a -70 c , 71 a -71 c , 72 a -72 c   ) and/or the side of the vertical end screen furthest from the side of the chamber with the pivot axis may be shaped to avoid contact with the chamber sidewall as the end wall is opened and the vertical end screen is withdrawn from the chamber (see, e.g.,  FIGS. 63-67, 68   a - 68   c ,  69   a - 69   c ,  70   a - 70   c ). 
       FIGS. 32-34 and 63-67  exemplify an embodiment wherein the side of the vertical end screen furthest from the side of the chamber with the pivot axis is shaped to avoid contact with the chamber sidewall as the end wall is opened and the vertical end screen is withdrawn from the chamber. In these embodiments, the vertical end screen  304   a  comprises a “shark fin” design. As best exemplified in  FIG. 63 , the screen  304   a  curves downwardly between a first side  310   a  (e.g., proximal the hinge  356 ), and a distally opposed second side  310   b . The downward curvature of the screen  304   a  prevents the screen  304   a  from colliding (e.g., interfering) with the cyclone sidewall  236  (or dirt chamber side wall) when the door  352   a  is being opened (see e.g.,  FIGS. 32 and 63 ). 
       FIGS. 64-67  exemplify an embodiment of a shark fin design wherein the bottom edge  310   c  of the screen  304   a  is flush with the second cyclone end wall  352  (e.g., it may be secured to the end wall).  FIGS. 68 a -68 c  and 69 a -69 c    exemplify another embodiment of a shark fin design wherein a portion of the bottom edge  310   c —proximal the second vertical screen side  310   b —is axially offset from the end wall  352  by an offset distance  314  (e.g., the shark fin design comprises a generally right-angular design).  FIGS. 70 a -70 c    exemplify another embodiment of a shark fin design wherein the bottom edge  310   c —proximal the first vertical screen side  310   a —is axially offset from the second cyclone end wall  352  by offset distance  314 . By spacing the vertical end screen a distance  314  from the end wall by a vertical support member and to the side of the end wall closest to the hinge  356 , the degree of curvature of the vertical end screen may be reduced. 
     It will be appreciated that in other embodiments, the vertical end screen  304   a  may not necessarily curve downwardly between the first side  310   a  and second side  310   b , but may otherwise have a first side  310   a  which is axially elevated relative to the second side  310   a . For example, the vertical screen  304   a  may slant downwardly at an angle to the vertical from an axially elevated first side  310   a  to an axially depressed second side  310   b  (e.g., it may be generally triangular in shape). This configuration may also ensure that that the vertical end screen  304   a  does not collide (e.g., interfere) with the cyclone sidewall  236  or dirt chamber side wall when the cyclone or dirt chamber end wall  352   a ,  352   b  is openable. 
     In still other embodiments, the vertical end screen  304   a  may have other suitable shapes, including a rectangular shape (e.g.,  FIGS. 71 to 75 ), a slanted trapezoidal shape (e.g.,  FIG. 76 ), a generally triangular shape (e.g.,  FIG. 77 ), or an arcuate or a curved shape (e.g.,  FIG. 78 ). 
     It will be appreciated that while the vertical end screen may be rigid (e.g., made of a rigid plastic and may be made of the same material as the sidewall or the end wall), the vertical end member, and optionally the vertical side screen, may be made of a resilient material. This may assist opening the end wall if the vertical end screen is secured to the end wall as the vertical screen member may deflect or bend if it contacts the chamber sidewall as the end wall is opened and the vertical screen member is withdrawn from the chamber. 
     In some embodiments, a single vertical end screen  340   a  may comprise two or more separable parts. For instance, as exemplified in  FIG. 16 , the vertical end screen  304   a  may comprise two separable parts  368   1  and  368   2 , connected to the first end wall portion  380  and second end wall portion  376 , respectively, of the second cyclone end  352 . Accordingly, the separable vertical screen parts  368   1 ,  368   2  may be moveable with their respective openable end wall portions (see e.g.,  FIG. 16 ). 
     The vertical end screen  304   a  may be either fixably mounted to the cyclone or dirt chamber end walls  352  (see e.g.,  FIGS. 18, 32, 40 and 41 ), or otherwise, moveably mounted to the cyclone or dirt chamber end walls  352 . For example,  FIGS. 20 and 21  exemplify an embodiment where the vertical end screen  304  is moveably mounted to the second end wall portion  376 . In this embodiment, the vertical end screen  304  may be rotated out of the cyclone chamber when the first sidewall portion  248  is removed (e.g., opened). This may facilitate cleaning of the vertical end screen  304   a.    
     The vertical end screen  304   a  may also be permanently or removably mounted to the second cyclone chamber end wall  352   a  or dirt chamber end wall  352   b . An advantage of a removably mounted screen is that the vertical end screen  304   a  may be removed for cleaning or replacement when the second end wall  352  of the cyclone chamber or dirt chamber (or first cyclone sidewall portion  238 ) is opened. 
     The vertical side screen  304   b  may be fixedly or moveably mounted to the inner cyclone side wall  236 . For example, in various cases, the vertical side screen  304   b  may be movable (e.g. pivotally, translatably, and/or removably) connected to one or more sidewall portions. This can allow surfaces of axially extending member  304  to move away from sidewall portion(s)  248 ,  252  where there is greater clearance and therefore better access for the user to clean those surfaces. For instance, as exemplified in  FIG. 8  axially extending member  304  is pivotally connected to a sidewall portion  248 ,  252 . In  FIG. 8 , axially extending member  304  is pivotally connected to the sidewall portion that remains in position. The pivoting connection may be formed by a hinge  328  that defines a rotation axis  332 . As shown, rotation axis  332  may extend through cyclone chamber  176 . In the example shown, rotation axis  332  is transverse to (e.g. perpendicular to) cyclone axis  232 . 
     As exemplified in  FIGS. 5-6 , in embodiments where the cyclone unit  170  has an openable sidewall portion  248 , the vertical side screen  304   b  may remain connected to the sidewall portion that does not have the end wall  244  attached thereto. Therefore, as exemplified, axially extending member  304  remains connected to sidewall second portion  252  when sidewall first portion  248  is moved to the open position. This allows dirt and debris that falls by gravity from axially extending member  304  (naturally or by the user brushing axially extending member  304 ) to fall out of cyclone chamber  176  without interference by cyclone second end wall  244 , which in this example remains connected to sidewall first portion  248 . 
     In still other embodiments, as exemplified in  FIG. 7 , rather than being exclusively connected to either the cyclone end wall or sidewall, the vertical screen  304  may be connected to both the inner surface of the cyclone sidewall  236  and the second cyclone end  244  (see e.g.,  FIG. 7 ). In these embodiments, as exemplified in  FIG. 7 , the axially extending member  304  may remain connected to a sidewall first portion  248  (the sidewall portion with end wall  244  attached thereto) when the sidewall first portion  248  is openable. 
     Dirt Ejection Mechanism 
     The following is a discussion of a dirt ejection mechanism, which may be may be used by itself or with one or more of the cyclone with an openable sidewall, the moveable screen, the dual end walls, the medial cyclone air inlet, the exterior dirt collection chamber, and the axially extending member (vertically extending screen). 
     Optionally, a dirt ejection mechanism may be provided inside of the cyclone chamber. The dirt ejection mechanism may comprise a cleaning member that is configurable to translate axially inside of the cyclone chamber. Preferably, the cleaning member may axially translate inside of the cyclone chamber using a handle assembly which is driving connected to the cleaning member, and which is located external to the cyclone chamber. The cleaning member may be used to remove dirt which aggregates on the shroud  212  (e.g., hair which may be wrapped around shroud  212 ). 
     Referring now to  FIGS. 84-95 , as exemplified, the cyclone unit  170  may include a cleaning member  420  located inside of the cyclone chamber  176 . The cleaning member may be of various shapes. For example, cleaning member  420  may be an annular member that extends around the circumference of the shroud  212 . In the exemplified embodiments, the cleaning member  420  comprises an annular member having a radial outer surface  420   a  and a radial inner surface  420   b  defining a central opening (e.g.,  FIGS. 86, 85   b  and  90   c ). Alternately, cleaning member  420  may extend only part way around the shroud  212 . For example, the cleaning member  420  may comprise a semi-annular member which only partially surrounds and engages the shroud  212  when at an axial elevation of the shroud  212 . 
     The radial inner surface, e.g., surface  420   a , may at least partially engage (i.e., contact) the outer surface of the shroud  212  when the annular member is at an axial elevation of the shroud  212  (see e.g.,  FIGS. 88 and 89A ). Optionally, all of the radial inner surface may engage the shroud  212 . 
     While the cleaning member  420  is exemplified as an annular (or semi-annular) member, it will be appreciated that the annular shape of the cleaning member is only a function of the cylindrical shape and design of the cyclone chamber  176 . Accordingly, in other cases, the cleaning member  420  may have any other suitable shape or design which is suited for the shape or design of the cyclone chamber and the shroud. For instance, the cleaning member  420  may have a square-shape, and may have a square-shaped central opening to surround a rectangular shaped shroud. 
     It will be appreciated that, if the shroud  212  is cylindrical, then the radial inner surface  420   a  may contact the shroud  212  along the entire length of the shroud  212  as the cleaning member  420  is translated axially along the length of the shroud  212 . Accordingly, the cleaning member may have a radial inner surface  420   a  that has a constant diameter. For example, the cleaning member  420  may be made of a rigid material, such as plastic. Optionally, a resilient member, e.g., a resilient gasket may be provided to abut the shroud  212  as the cleaning member is translated axially along the shroud  212 . 
     Alternately, if the shroud is conical, then the radial inner surface  420   a  may contact the shroud  212  along only a portion of the length of the shroud  212  (e.g., the upper portion if the cyclone is oriented vertically as exemplified) as the cleaning member  420  is translated axially along the length of the shroud  212 . 
     In some embodiments, the cleaning member  420  may also have an adjustable central opening (not shown). The adjustable opening may accommodate shrouds which have changing diameters along their axial length (e.g., a tapered or frusto-conical shroud, as exemplified in  FIG. 61 ). For example, the cleaning member  420  may be reconfigurable to maintain contact with the shroud  212  as the cleaning member  420  is translated long at least a portion of, and optionally all of, the axial length of the shroud  212 . 
     For example, the cleaning member may be made of an elastomeric member or the cleaning member  420  may include an elastomeric member (or membrane) attached to the radial inner surface  420   b  that extends radially inward as the diameter of the shroud  212  against which it abuts is reduced. As the cleaning member  420  is returned to its storage position at the top of the cyclone chamber, the radial inner surface  420   a  may be deformed radially outwardly by the outer wall of the shroud  212 . Accordingly, the elastomeric member may increase and decrease in size so as to accommodate the changing diameter of the shroud, and to otherwise clean the shroud at all points along the shroud&#39;s axial length. In other cases, the cleaning member  420  may include an adjustable mechanical aperture which dilates and contracts to accommodate the changing diameter of a tapered shroud. 
     As exemplified, the cleaning member  420  may be either detached (e.g., separated) or attached (e.g., connected) to the shroud  212 . 
       FIGS. 85-88  exemplify an embodiment where the cleaning member  420  is detached from the shroud  212 . In this embodiment, the shroud  212  is fixed inside of the cyclone chamber  176 , and the cleaning member  420  is axially translatable, along cyclone axis  232 , inside of the cyclone chamber  176 . For example, the cleaning member  420  may translate between an initial storage or operating position, wherein the cleaning member  420  is located proximal (e.g. abuts) the first cyclone end  240  (e.g.,  FIG. 86 a   ), to a “cleaned position” wherein the cleaning member  420  has been translated by any suitable distance towards or to the second cyclone end  244 . The storage or operating position may define the position of the cleaning member  420  during storage of the air treatment member  116  and/or operational use of the air treatment member  116 . In some cases, the cleaning member  420  may travel toward the second cyclone end by only the extent of the axial length of the shroud  212  (e.g., downwardly as exemplified in  FIGS. 87 and 88 ). In other cases, the cleaning member  420  may translate beyond the axial length of the shroud  212  (see e.g.,  FIG. 91 ). In still other cases, the second cyclone end  244  may be openable, and the cleaning member  420  may axially translate to outside of the cyclone chamber  176 . Similarly, as exemplified in  FIGS. 111-112 , in an inverted cyclone configuration, the cleaning member  420  may be translated from an initial storage or operating position, in which the cleaning member  420  is positioned proximal (e.g., abuts) the second cyclone end  244  ( FIG. 111B ), to one or more “cleaned positions” in which the cleaning member  420  has been upwardly translated towards the first cyclone end  240  ( FIGS. 112A-112E ), and optionally, beyond an openable first cyclone end  240  to partially or fully extended out of the cyclone chamber  176  ( FIG. 112F ). 
     An advantage of the detached annular member configuration is that the cleaning member  420  may be used for scraping dust and dirt from the exterior of the shroud  212 . For example, the radial inner surface  420   b  of the annular member may engage and wipe dirt or draw hair wrapped around the shroud  212  from the exterior of the shroud  212  as the annular member is axially translated from the first cyclone end towards the second cyclone end. The wiped dust and dirt may then collapse and aggregate inside of the cyclone&#39;s internal dirt chamber  172   a . In some cases, the second cyclone end wall  352  may be opened, and the cleaning member  420  may also axially translate beyond the outside of the cyclone chamber  176 . This may allow the member to be used to push debris (e.g., hair balls) entirely outside of the cyclone chamber  176 . Accordingly, it will be appreciated that the cleaning member  420  can facilitate cleaning of the shroud  212  from dirt and debris without otherwise requiring the shroud  212  to be removed from inside of the cyclone chamber  176 . 
     To enhance wiping and cleaning of dirt from the shroud  212 , the radial inner surface  420   b  of the cleaning member  420  may be variable configured. For example, the radial inner surface  420   b  may be textured (e.g., roughly textured) to facilitate wiping of dirt from the shroud. The radial inner surface  420   b  may also include one or more scrapers (e.g., prongs) to scrape dirt from the exterior of the shroud  212  (e.g., similar to prongs  462  exemplified in  FIG. 90B ). 
       FIGS. 89A-89C  exemplify another embodiment of the cleaning member  420 . In this embodiment, the radial inner surface  420   b  of the cleaning member  420  is attached to the shroud  212 . For example, the radial inner surface  420   b  may be permanently connected (e.g., integrally molded), or otherwise detachably connected to a non-permeable portion of the shroud  212 .  FIGS. 108 and 113  exemplify a configuration in which an annular plate  560  is attached (e.g., integrally molded, or detachably connected) around an axial outer end  212   b  of shroud  212 . In this configuration, as exemplified, the cleaning member  420  is attached, at one surface, to the plate  560 , to connect to the shroud  212 . 
     In this configuration, the cleaning member  420  and the shroud  212  are concurrently moveably along all or a portion of the axial length of the cyclone chamber  176 . Accordingly, as exemplified in  FIGS. 89B and 89C  and  FIG. 108 , the cleaning member  420  and the shroud  212  may be translated from the first cyclone end  240  (i.e., the storage or operating position) towards, to or past an opened second cyclone end  244  (i.e., a cleaned position), and optionally partially or fully extended outside of the cyclone chamber  176 . Alternatively, as exemplified in  FIGS. 113A-113C , using an inverted cyclone configuration, the cleaning member  420  and the shroud  212  may be translated from the second cyclone end  244  (i.e., the storage or operating position) towards, to or past the first cyclone end  240  (i.e., a cleaned position), and optionally, partially or fully extended outside of the cyclone chamber  176 . An advantage of this configuration is that a user may access the shroud  212  from the opened first cyclone end  240  or second cyclone end  244 , as the case may be, to clean the shroud  212  from dirt and debris. Where the shroud  212  is detachably connected to cleaning member  420 , the user may further detach the shroud from the cleaning member  420  to more easily clean the shroud, or otherwise, to entirely replace the shroud  212 . In other cases, rather than translating the annular member and shroud outside of the cyclone chamber, the user may axially vibrate the annular member and shroud inside of the cyclone chamber to debride the shroud from dirt and debris. 
     In still other embodiments, a cleaning member  420  may not be provided, and the shroud  212  may be moveable between an initial storage or operating position, to one or more positions in which the shroud may be cleaned by a user. For example, as exemplified in  FIGS. 162-163 , in an upright cyclone configuration, the shroud  212  may be moveable from the first cyclone end  240  (i.e., an initial storage or storage position) ( FIG. 162B ), towards, to or past an opened second cyclone end  244  ( FIGS. 163B and 163C ). In which positions, it will be easier for a user to access the screen and clean the screen. Accordingly such positions may be referred to as cleaning positions (i.e., the user may clean the screen) or cleaned positions (i.e., the user has cleaned the screen). It will be appreciated that a screen moveable without a cleaning member may also be used in an inverted cyclone configuration. 
     Optionally, in embodiments in which a cleaning member  420  is provided, and irrespective of whether the cleaning member  420  is detached or attached to the shroud  212 , the radial outer surface  420   a  of the cleaning member  420  may also at least partially engage the inner cyclone sidewall  236 . Accordingly, axial movement of the cleaning member  420  may also wipe (e.g., scrape) dirt from the inner surface of cyclone sidewall  236 . The radial outer surface  420   a  may have any configuration to facilitate wiping of dirt from the inner cyclone sidewall  236 . For example, the radial outer surface  420   a  may be flat or textured. Alternatively, or in addition, as exemplified in  FIG. 90 , the radial outer surface  420   a  may include one or more axially extending prongs (e.g., ribs)  462  which facilitate scraping of dirt from the cyclone side wall. 
     It will be appreciated that the radial inner or outer surface which contacts the shroud or sidewall may be made of a material that causes less friction as the cleaning member is moved (e.g., nylon). Alternately or in addition, the radial inner and/or outer surface may be dimensioned so as to be positioned proximate but not to contact the shroud or sidewall. 
     Optionally the cleaning member may be actuatable from a position exterior to the cyclone chamber. For example, if the cleaning unit includes a drive motor, then an actuation member may be provided exterior to the cyclone unit, e.g., on an outer wall of the cyclone chamber. Alternately, a handle assembly may be provided, at least partially, outside the cyclone chamber (also referred to herein as a driving assembly, or a driving linkage). The handle assembly may be operable between a storage position (in which the assembly is retracted when the surface cleaning apparatus is in use), an extended position in which the assembly is driving connected to the cleaning member and/or shroud and the cleaning member and/or shroud are in the storage position (for when the surface cleaning apparatus is used for cleaning) and a cleaned position in which the cleaning member and/or shroud have been translated inside the cyclone chamber to clean the shroud  212 . 
     Driving Assembly 
       FIGS. 85-95 and 102-166  exemplify various configurations for a driving assembly which drivingly engage the cleaning member  420  and/or shroud  212 . The driving assembly can be used to translate the cleaning member and/or shroud between an initial storage or operating position, and one or more cleaned positions. In the exemplified embodiments, the drivingly assembly  436  may either extend (e.g., penetrate) through a wall of the cyclone (e.g., an end wall of sidewall  236 ) to physically connect with the cleaning member and/or shroud (see for example  FIGS. 85-95, 102-113, 116-163 ), or alternately, can apply an external driving force without extending through a wall of the cyclone (see for example  FIGS. 130-131 ). 
     A. Driving Assembly Extending Through Cyclone Sidewall 
       FIGS. 85-95, 102-113 and 116-163  exemplify driving assemblies which extend, at least partially, through a wall of the cyclone to drivingly engage the cleaning member  420  and/or shroud  212 . In particular, as exemplified, the driving assembly  436  may extend through: (a) the first cyclone end  240  (see for example  FIGS. 104-110  and  FIG. 161 ), (b) the second cyclone end  244  (see for example  FIGS. 111-113 ); or (c) an axial gap  444  provided along the cyclone sidewall  236  (see for example  FIGS. 85-95, 102, 116-160 and 162-163 ). 
     (a) Driving Assembly Extending Through First or Second Cyclone End 
       FIGS. 104-113 and 161  exemplify an embodiment of the driving assembly  436  which extends, at least partially, into the cyclone chamber  176 , through either the first cyclone end  240  ( FIGS. 104-110 and 161 ) or the second cyclone end ( FIGS. 111-113 ), to drivingly engage the cleaning member  420  and/or shroud  212 . Optionally, as exemplified, the driving assembly  436  extends through the cyclone end wall which has the cyclone air outlet. This enables a cleaning member to be positioned in the cyclone chamber such that, when it is desired to clean the screen, the cleaning member is positioned ready to travel axially through the cyclone chamber along the screen towards, e.g., an openable end of the cyclone chamber. Accordingly, the first cyclone end  240  when the cyclone  170  is configured as an upright cyclone, and extends through the second cyclone end  244  when cyclone  170  is configured as an inverted cyclone. 
     In the exemplified embodiments, and as best exemplified in  FIGS. 105 and 111 , the driving assembly  436  comprises an elongate member  438  (also referred to herein as a longitudinally extending driving rod, a driving rod or an elongate rod). The elongate rod  438  extends, along axis  428 , between a first end  438   a  and an axially spaced apart second end  438   b  ( FIGS. 105 and 111B ). As exemplified, axis  428  may be generally parallel to cyclone axis  232 . 
     In the exemplified embodiments, the elongate rod  438  can extend through the first cyclone end  240  ( FIG. 105 ), or the second cyclone end ( FIG. 111 ). In embodiments in which the elongate rod  438  extends through the first cyclone end  240  ( FIG. 105 ), rod  438  can extend through an opening  802   a  provided at the first end  240 . Alternatively, in embodiments in which the elongate rod  438  extends through the second cyclone end  244  ( FIG. 111C ), rod  438  can extend through an opening  802   b  provided at the second end  244 . As exemplified in  FIG. 161B , in other embodiments, elongate rod  438  can also extend directly through the cyclone air outlet  204 . 
     Optionally, as exemplified in  FIGS. 104A and 111C , if rod  438  extends through an opening  802  located on the cyclone end wall, a seal (e.g., a sealing gasket or the like) may be associated with an opening  802  to seal the openings  802 . For example, a seal  804   a  may be provided on an inner surface of an end wall adjacent an opening  802   a , on an outer surface of the end wall adjacent an opening  802   a  inside the opening  802   a  (i.e., the portion of the wall defining the opening extending through the end wall between the inner and outer surface of the end wall), at the first cyclone end  240  ( FIG. 104A ). Similarly, a seal  804   b  may be associated with the opening  802   b , at the second cyclone end  244  ( FIG. 111C ). An advantage of this configuration is that the seal members  804  can seal the openings  802  during operation of the air treatment member  116 , and otherwise prevent air flow leakage through openings  802 . Seals  804  may be formed from any suitable material to facilitate sealing of openings  802 , as well as to facilitate smooth axial movement of elongate rod  802  through the openings  802 . For example, seals  804  can be formed from one or more of felt, microfiber, polytetrafluoroethylene (PTFE), ultra-high-molecular-weight polyethylene (UHMWPE, UHMW), high-density polyethylene (HDPE), or other low friction and/or deformable materials. 
     As exemplified, irrespective of whether the rod  438  extends through the first or second cyclone end, the second end  438   b  of the elongate member  438  may be attached to the cleaning member  420 . For instance, as exemplified in  FIG. 105 , the second end  438   b  may be attached to a surface (e.g., face) of the cleaning member  420  that faces towards the first cyclone end  240 . Alternatively, as exemplified in  FIG. 111B , the second end  438   b  of rod  438  may be attached to a surface (e.g., face) of the cleaning member  420 , that faces towards the second cyclone end  244 . 
     The second end  438   b , of rod  438 , can attach to the cleaning member  420  in any manner known in the art. For example, the second end  438   b  may be integrally formed with the cleaning member  420 . Alternatively, the second end  438   b  may be removably attached (e.g., detachably connected) to the cleaning member  420 . 
     As exemplified in  FIGS. 106A-106E and 112A-112E , the elongate rod  438  may translate axially inwardly, into the cyclone chamber  176  (e.g., along axis  428 ), to translate the cleaning member  420  between an initial storage or operational position ( FIG. 105 or 111B ), and one or more cleaned positions ( FIGS. 106A-106E  or  FIGS. 112A-112E ). Accordingly, the elongate member  438  drives movement of the cleaning member  420 , inside the cyclone chamber  176 , in a manner analogous to a plunger. 
     In some embodiments, as exemplified in  FIGS. 108A-108C and 113A-113E , rather than drivingly engaging only the cleaning member  420 , the rod  438  can also drive movement of the cleaning member  420  and shroud  212 , concurrently. For example, as exemplified, the shroud  212  may be attached to the cleaning member  420 , and the shroud  212  can translate concurrently with the cleaning member  420 . 
     In still other embodiments, as exemplified in  FIGS. 161A-161D  a cleaning member  420  may not be provided inside the cyclone  170 , and accordingly, the elongate rod  438  may be provided to drivingly engage a moveable shroud  212 . For instance, as exemplified, the elongate rod  438  may be attached to an axially inward end  212   a  of shroud  212 , so it may translate the shroud  212  between a storage position ( FIG. 161B ) and a cleaned position ( FIG. 161D ). In other cases, the elongate member  438  may be attached to the moveable shroud  212  at any other suitable location. 
     Optionally, as exemplified in  FIGS. 104A and 111C , the elongate rod  438  can include a handle  440  (e.g., a grip). The handle or grip  440  may be provided, for example, at the first end  438   a  of the elongate rod  438 , and can be used to facilitate axial movement of the rod  438  by a user. 
     (b) Driving Assembly Extending Through an Axial Sidewall Gap 
       FIGS. 85-95, 102-103, 114-160 and 162-163  exemplify an alternate configuration for drivingly engaging a driving assembly  436  to a cleaning member  420  and/or shroud  212  via a gap or opening provided in a sidewall of an air treatment member, such as a cyclone. 
     As exemplified, an axial gap  444  is provided along the cyclone sidewall  236  ( FIG. 117C ) to allow at least a portion of the driving assembly  436  to extend into the cyclone chamber  176 , and to drivingly engage the cleaning member  420  and/or shroud  212 . In this manner, the driving assembly  436  can be used to translate the cleaning member  420  and/or shroud  212  between a storage or operating position, and one or more cleaned positions. 
     As best exemplified by  FIG. 117C , the axial gap  444  may extend, e.g., axially between a first gap end  444   a , and an axially spaced apart second gap end  444   b . Optionally, the axial gap  444  extends along an axis parallel to the cyclone axis  232 . Optionally, the first gap end  444   a  is positioned proximate the first cyclone end  240 , and the second gap end  444   b  is positioned proximate the second cyclone end  244 . The axial gap  444  may extend by any distance between the first gap end  444   a , and the second gap end  444   b . For example, as exemplified in  FIG. 117C , the axial gap  444  can extend substantially between the first and second cyclone ends  240 ,  244 . As explained herein, an advantage of this configuration is that the axial gap  444  may allow the driving assembly  436  to engage, and translate the cleaning member  420  and/or shroud  212  completely between the first cyclone end and the second cyclone end. In other embodiments, the axial gap  444  may extend only partially between the first and second cyclone ends ( FIG. 162 ). 
     In the exemplified embodiment of  FIG. 117C , the second gap end  444   b  is an open end, and is otherwise flush with the second cyclone end  244 . This configuration, as exemplified herein, may allow the cleaning member  420  and/or shroud  212  to be removed, e.g., the driving assembly  436  may be able to continue to slide axially and be removed from the cyclone chamber  176  along with the cleaning member and/or shroud. 
     The axial gap  444  may be positioned at any location around the cyclone sidewall  236  from the dirt outlet  178 . For instance, as exemplified in  FIG. 118C , the axial gap  444  may be provided downstream from the dirt outlet  178 , in the direction of air rotation. In the exemplified embodiment, the axial gap  444  is provided 180° around the cyclone sidewall downstream from the dirt outlet  178 . In other embodiments, the axial gap  444  can be provided, for example, 10°, 20°, 30°, 45°, 90° or 135° degrees downstream from the dirt outlet  178 . 
     The axial gap  444  may be sealed in any manner known in the art to prevent air leakage, through the axial gap  444 , when the air treatment member  116  is in operational use. 
       FIGS. 114-117 and 120  exemplify a first configuration for sealing the axial gap  444  wherein a sealing rib (or spline) is used to seal the axial gap  444 . In particular, as best exemplified in  FIGS. 116 and 120 , when it is desired to operate the air treatment member  116  the air treatment member  116  is mounted to an upright section  120  of the surface cleaning apparatus  100  ( FIGS. 114 and 115 ). As exemplified, the air treatment member  116  is oriented vertically upright, and mounted to the apparatus  100  with the axial gap  444  facing the upright section  120  ( FIG. 116C ). As best exemplified in  FIGS. 116A-116B, 117A-117B and 120B , in the mounted position, the axial gap  444  is sealed by a spline (or rib)  518 , which axially extends, along a portion of the upright section  120 , and is receivable inside the axial gap  444  to seal the axial gap  444  during operation of the air treatment member  116  ( FIGS. 116C and 120B ). As exemplified, rib  518  can extend across the entire depth  448  of the axial gap  444  ( FIG. 116C ), or across only a portion of the depth  448  of axial gap  444  ( FIG. 120B ). Rib  518  may have a depth such that the outer extent of rib  518  seats flush with the inner surface of the cyclone sidewall. 
     Preferably, the spline  518  is configured to have an axial length, and lateral width, which are substantially equal to the axial length and lateral width of axial gap  444 . In this manner, spline  518  can completely seal the axial gap  444 , and otherwise prevent air flow leakage through gap  444 . In embodiments where a driving assembly  436  is provided, and extends through gap  444  ( FIG. 116B ), the spline  518  can have an axial length which is slightly less than the axial length of gap  444  so as to accommodate the driving assembly  436  extending through the gap  444 . For instance, as exemplified in  FIG. 116B , spline  518  can extend to a position, e.g., below or slightly below the handle  440 , so as to not contact the handle  440  when the air treatment member  116  is mounted to the upright section  120 . Optionally, a cavity  514  is provided, above spline  518 , to receive a handle  440  when the cleaning member  420  is in the storage position. As exemplified, a lateral surface  504  may also be provided, inside the cavity  514 , to rest the handle  440 . A gasket or other sealing member may optionally be provided between spline  518  and the wall defining the gap  444 . 
     The air treatment member  116  can be mounted in any suitable manner to the cleaning apparatus  100 , so as to secure the air treatment member  116  to the cleaning apparatus  100 . For instance, in the configuration exemplified in  FIGS. 116B, 117B and 120C , a mounting structure is provided to mount the air treatment member  116  to upright section  120 . As exemplified, the mounting structure can comprise one or more retention members  522 , extending laterally from the upright section  120 , below spline  518 . Each retention member  522  can comprise a distal hook-shaped end. The hook-shaped ends engage legs  526 , which depend from a bottom openable door  352  (or second cyclone end  244 ) of the air treatment member  116 . Optionally, each leg  526  is hollowed to receive the hook-shaped ends. As exemplified, the retention members  522  support the air treatment member  116 , to the upright section  120 , and in engagement with spline  518 . Any locking member known in the vacuum cleaner arts may be used to secure the air treatment member  116  is position. 
     As best exemplified in  FIGS. 119A-119F , the axial gap  444  is formed between a first sidewall edge  516   a  and a second spaced apart sidewall edge  516   b  of the cyclone sidewall  236 . Each sidewall edge  516  extends laterally between an outer surface  463   a  of the cyclone sidewall  236  and an inner surface  463   b  of the cyclone sidewall  236  (e.g., inside the cyclone chamber  176 ), to define the axial gap depth  448 . 
     The sidewall edges  516   a ,  516   b  can be configured with any suitable design. For instance, as exemplified, in some embodiments, each sidewall edge  516   a ,  516   b  can be configured to be substantially straight or linear ( FIG. 119A ), i.e., orthogonal to the inner and outer surface of the cyclone sidewall. In other cases, at least one of the sidewall edges  516  may be chamfered, or beveled (e.g., angled). For example, one of the sidewall edges  516  can be chamfered or beveled ( FIGS. 119B and 119E ), or both sidewall edges can be chamfered or beveled ( FIGS. 119C-119D and 119F ). In cases where both sidewall edges are chamfered, the sidewall edges can be chamfered at the same angle ( FIG. 119C ), or at different angles ( FIGS. 119D and 119E ). In the exemplified embodiments, the edges  516  are chamfered such that the axial gap  444  is wider inside the cyclone chamber  176  than outside the cyclone chamber  176 . An advantage of using a chamfered sidewall edge is that it can minimize air flow turbulence, around the axial gap  444 , during operation of the cyclone  170 . 
     While the exemplified embodiments illustrate the entire sidewall edge  516  as being chamfered or beveled, it will be appreciated that, in other embodiments, only a portion of the sidewall edge can be chamfered or beveled. For example, only a radial inner portion of the sidewall edge (e.g., proximal the cyclone chamber  176 ) may be chamfered, while a radial outer portion may not be chamfered (e.g., it may be straight or linear), or vice-versa. In some cases, the portion of the sidewall edge that is chamfered may comprise 20%, 30%, 40%, 50%, 60%, or 70% of the total radially extending area of sidewall edge  516 . 
     In embodiments in which an axial sidewall gap  444  is provided, a driving assembly  436  can extend, at least partially, through the axial gap  444 , to drivingly engage the cleaning member  420  and/or shroud  212 . In this manner, the driving assembly  436  is operable to translate the cleaning member  420  and/or shroud  212  axially while the driving assembly travels axially along axial gap  444  between an initial storage or operating position, and one or more cleaned positions. 
       FIGS. 85-95, 102, 121-129, 132-160 and 162-163  exemplify various configurations for driving assemblies which drivingly engage the cleaning member  420  and/or shroud  212  through axial gap  444 . In particular, in the exemplified embodiments, the driving assembly  436  can comprise: (i) an external handle ( FIGS. 121-124, 126-129 and 162-163 ), (ii) an elongate rod ( FIGS. 85-95, 102 and 125 ); or (iii) a handle and/or elongate rod in conjunction with an intermediate driving mechanism ( FIGS. 132-160 ). 
     (i) External Driving Handle: 
       FIGS. 117-125, 126-129 and 162-163  exemplify a first embodiment of a driving assembly  436 , which is drivingly engaged to the cleaning member  420  and/or shroud  212  through the axial gap  444  wherein the driving assembly  436  uses a driving handle  440  whose radial inner end extends through the gap to directly contact the cleaning member  420  and/or shroud  212 . 
     As exemplified, the handle  440  comprises a linearly extending member that extends through the gap  444  and engages the cleaning member  420  and/or shroud  212 . The radial outer end of handle  440  (the portion outside the cyclone which may be gripped by a user) may be of any configuration. As exemplified, handle  440  is a linearly extending member which may be relatively short (e.g.,  FIG. 117A ) such that the radial outer end is positioned proximate the sidewall or relatively longer (e.g.,  FIG. 125 ) such that the radial outer end is positioned spaced from the sidewall. 
     The handle  440  can drivingly engage the cleaning member and/or shroud in any suitable manner. For example,  FIGS. 117C and 121  exemplify an embodiment where the handle  440  is integrally formed with the cleaning member  420 . In particular, as exemplified, the handle  440  comprises a lateral portion  422 , of the cleaning member  420 , which extends laterally or radially through axial gap  444 . In this configuration, the handle  440  is in driving engagement with the cleaning member  420  ( FIG. 121 ), or the cleaning member  420  and shroud  212  ( FIG. 127 ) (e.g., wherein the shroud  212  is attached to the cleaning member  420 ). In other embodiments, in which no cleaning member  420  is provided, handle  440  may be integrally formed (or otherwise, drivingly engaged) to a moveable shroud  212  ( FIG. 162 ). For instance, handle  440  may be integrally formed with a plate  562  that may be attached to and surround an axial outward end  212   b  of shroud  212 . In other embodiments, handle  440  may not be integrally formed with the cleaning member  420  and/or shroud  212 , but may comprise a separate member portion. The separate member portion may drivingly engage the cleaning member  420  and/or shroud  212  using any suitable attachment mechanism (e.g., a bolt or a rivet or an adhesive or the like). 
     As exemplified in  FIGS. 121A-121C, 123A-123C, 124A-124C and 126A-126D , in embodiments where the handle  440  is drivingly engaged to the cleaning member  420 , the handle  440  can translate along axial gap  444  to translate the cleaning member  420  from an initial storage or operating position ( FIGS. 121A, 124B and 126A ), to one more cleaned positions ( FIGS. 121B-121C, 123B-123C, 124C and 126B-126D ). In other cases, where the shroud  212  is attached to the cleaning member  420  (e.g., integrally formed or detachably attached), as exemplified in  FIGS. 127A-127E , handle  440  can translate the cleaning member  420  and shroud  212  concurrently from a storage or operating position ( FIG. 127A ) to one or more cleaned positions ( FIGS. 127B-127E ). As exemplified in  FIGS. 162-163 , handle  440  can also translate only a moveable shroud  212  from a storage or operating position ( FIG. 162B ) to one or more cleaned positions ( FIGS. 163B and 163C ). 
     Optionally, as exemplified in  FIG. 118 , an external track  430  may be provided to guide axial movement of the handle  440  along axial gap  444 . For instance, as best exemplified in  FIGS. 118C and 118D , the hollow track  430  can be provided externally and adjacent to the cyclone sidewall  236  (e.g., on the radial outer side of the cyclone sidewall  236 ) and may surround or overlie the axial gap  444 . As exemplified, track  430  can extend axially along axis  428  between a first end  432  and an axially spaced apart second end  434  ( FIG. 118A ). 
     The track  430  may have any suitable axial length (e.g., height)  424 , which may be the same as the height of gap  444 . For instance, as exemplified in  FIG. 118B , the track  430  may have an axial height  424  that is substantially equal to the axial height  320  of cyclone  170 . Accordingly, the first end  432  of track  430  can be located proximal the first cyclone end  240 , and the second track end  434  can be located proximal the second cyclone end  244 . An advantage of this configuration is that the track  430  can guide axial motion of the driving assembly  436  (e.g., handle  440 ) along substantially the entire axial length of cyclone  170 . In other embodiments, track  430  may extend along only a portion of the axial length of cyclone  170 , or may extend beyond the axial length of the cyclone  170 . Optionally, the second track end  434  may be open ended to allow handle  444  to remove the cleaning member  420  and/or shroud  212  from an opened second cyclone end  240  (e.g.,  FIG. 127E ). In various cases, this may allow a user to access the cleaning member  420  and/or shroud  212  for cleaning or replacement. 
     As best exemplified in  FIGS. 118C-118D , track  430  comprises a first track segmented  431   a , formed on one lateral side of axial gap  444 , and a second track segment  431   b , formed on an opposed lateral side of axial gap  444  (radially spaced around the cyclone sidewall). In some cases, the track segments  431  may be integrally formed with the cyclone sidewall  236 . Each segment forms a cavity defining a lateral portion of the track. An axial gap  447  is formed between the two track segments  431 , opposite axial gap  444 , to accommodate the handle  440  ( FIG. 118D ). As exemplified in  FIG. 118D , handle  440  can include a linearly extending portion  445 , which extends through the axial gap  447 , track  430  and axial gap  444 . Preferably, as exemplified in  FIG. 118D , portion  445 , itself, comprises two lateral extending portions or wings  446   a ,  446   b , which are recievable into cavities formed inside track segments  431   a  and  432   b , respectively. Accordingly, track  430  guides axial movement of handle  440  by guiding the lateral portions  446 . 
     Optionally, as exemplified in  FIGS. 118C and 118D , at least a portion of the track  430  can be lined with a sealing member. In particular, as exemplified in  FIG. 118C , a first sealing member  690   a  may line the inside of first track segment  431   a , and a second sealing member  690   b  may line the inside of the second track segment  431   b . Optionally, as exemplified in  FIG. 118C , the longitudinal edges of the sealing members  690   a ,  690   b  can abut each other around the axial gap  447 , to seal the gap  447 . 
     An advantage of the sealing members  690  is that they may at least partially seal the axial gap  444  during operation of the air treatment member  116 . For instance, as exemplified in  FIG. 120B , when rib  518  is inserted into axial gap  444  (i.e., when the air treatment member  116  is mounted to the surface cleaning apparatus  100 ), seal  690  can provide an additional layer of sealing protection, around the rib  518 , to further prevent air flow leakage. Another advantage of the sealing member  690  is that can reduce friction between the handle  440  and track  430  (e.g., handle portions  446  and track segments  431 ) during movement of the handle  440  across the track  430 . 
     The sealing member  690  may be formed from any suitable material to facilitate sealing of axial gap  444 , as well as to facilitate axial movement of handle  440 . Sealing member  690  is optionally flexible and may be made of any material used to form a gasket. For example, the sealing member  690  can be formed from one or more of felt, microfiber, Polytetrafluoroethylene (PTFE), Ultra-high-molecular-weight polyethylene (UHMWPE, UHMW), High-density polyethylene (HDPE), or other low friction and/or deformable seals. 
     (ii) Elongate Driving Rod: 
       FIGS. 85-95 and 102  exemplify an alternative configuration for a driving assembly  436 , which drivingly engages the cleaning member  420  and/or shroud  212  through axial gap  444  wherein the driving assembly  436  comprises an elongate axially extending driving rod  438 . Driving rod  438  may be connected to the cleaning member  420  and/or shroud  212  in a similar manner as discussed with respect to handle  440 . 
     In the exemplified embodiment, and as best exemplified in  FIG. 85 , the elongate rod  438  is disposed external to the cyclone chamber  176 , and extends along an axis  428 , between a first end  438   a  and a second end  438   b . Axis  428  extends generally parallel to cyclone axis  232 . 
     As exemplified, a portion of the elongate member  438  may drivingly engage the cleaning member  420  through axial gap  444 . For instance, as exemplified in  FIG. 86 , elongate rod  438  can drivingly engage the cleaning member  420  using one or more connecting members  460  (e.g., bolts or rivets) which extends through axial gap  444 .  FIGS. 87 and 158  exemplify another configuration, where the cleaning member  420  includes a lateral portion  422 , which may be integrally formed as part of rod  438 , which extends through axial gap  444  to attach to the elongate rod  438 . 
     Any portion of the elongate rod  438  can drivingly engage the cleaning member  420  and/or shroud  212 . For example,  FIGS. 87 and 158  exemplify an embodiment where the second end  438   b , of the elongate member  438 , drivingly engages the cleaning member  420 . Alternatively, in other cases, a mid-portion of the elongate member  438  can drivingly engage the cleaning member  420  ( FIGS. 89-90, and 102 ). As discussed with respect to handle  440 , as exemplified in  FIG. 87-89 , the elongate member  438  can be used to translate the cleaning member  420  between an initial storage or operating position ( FIG. 87A ) and one or more cleaned position ( FIGS. 87C and 88 ). In cases where the shroud  212  is attached to the cleaning member ( FIGS. 89A-89C ), the elongate member  438  can also translate both the cleaning member  420  and shroud  212 , concurrently. In still other cases, where no cleaning member  420  is provided, the elongate rod  438  may drivingly engage and translate a moveable shroud  212 . 
     Optionally, as discussed with respect to handle  440  and as best exemplified in  FIG. 102 , an external hollow track  430  may be provided adjacent to the cyclone sidewall  236 , outside of the cyclone chamber  176 . 
     in embodiments wherein the air treatment member  116  comprises two or more cyclonic cleaning stages  168   1  and  168   2  arranged in series (e.g.,  FIG. 89 ), the track  430  may have an axial length  424  that is the substantially equal to the combined axial height of both cyclonic stages. In still other embodiments, track  430  may extend along only a portion of the axial height of the cyclone  170 , or may have a height  424  that is greater than the axial height  320  of the cyclone chamber. It will be appreciated that an advantage of providing track  430  is that it may guide axial motion of the elongate member  438 . Accordingly, a longer track may guide axial movement of the elongate member  438  over a greater distance. 
     Optionally, the elongate member  438  can include a handle  440  (e.g., a hand grip portion) to facilitate axial movement of the elongate member  438  by a user. As exemplified in  FIG. 102 , the handle  440  may be provided at the first end  438   a  of the elongate member  438 . The handle  440  may be, for example, integrally formed with the elongate member  438 , or may be a separate member portion attached to the elongate member  438  (e.g., via bolt or rivet  440   a , as exemplified in  FIG. 94B ). 
     While the exemplified embodiments have illustrated the driving rod  438  being used to engage and translate a cleaning member  420 , or a cleaning member  420  and/or shroud  212 , in other cases, the same configuration can be sued to translate a moveable shroud  212  into one or more cleaned positions. 
     (iii) Handle and/or Driving Rod in Conjunction with an Intermediate Driving Mechanism 
       FIG. 132-160  exemplify embodiments for a driving assembly  436  drivingly engaged to the cleaning ember  420  and/or shroud  212  through axial gap  444  wherein the driving assembly  436  comprises a handle  440  and/or a driving rod  438 , which is drivingly engaged to the cleaning member  420  and/or shroud  212  through axial gap  444  using an intermediary driving mechanism. As exemplified, any suitable intermediary mechanism may be used to drivingly engage a handle or driving rod to the cleaning member  420  and/or shroud  212 . In the exemplified embodiments, the intermediary mechanism comprises one or more of a pulley mechanism ( FIGS. 132-141 ), a gear mechanism ( FIGS. 142-149 ), a hydraulic or pneumatic mechanism ( FIGS. 150-156 ) or a Bowden cable mechanism ( FIGS. 157-160 ). 
     Intermediary Pulley Mechanism 
       FIGS. 132-141  exemplify different configurations for a pulley mechanism, which can function as an intermediary driving mechanism to drivingly engage a handle  440  and/or elongate rod  438 , to a cleaning member  420  and/or shroud  212 , through axial sidewall gap  444 . 
       FIGS. 132-134  exemplify a first configuration for the pulley mechanism. In the exemplified configuration, the pulley mechanism comprises a cord (e.g., a string)  606 , which drivingly connects handle  440  to cleaning member  420 . In particular, and as exemplified, the first end  606   a  of cord  606  optionally is attached to handle  440 , and the second end  606   b  of cord  606  is attached to cleaning member  420 . As exemplified in  FIG. 133B , the second end  606   b  of cord  606  may extend through axial gap  444  to attach to cleaning member  420  (e.g., a lateral portion  422  of cleaning member  420 ). Optionally, an opening  602  (e.g., aperture) is provided at the lateral portion  422  to attach cord  606  to cleaning member  420 . 
     As exemplified in  FIGS. 132 and 133A , a rotating pulley  610  is provided outside the cyclone  170 . In the exemplified embodiment, pulley  610  is rotatably secured to one or more longitudinal walls  620   a  and  620   b , which depend laterally from cyclone sidewall  236 . Alternatively, pulley  610  can be secured outside of the cyclone  170  in any other suitable manner. Preferably, pulley  610  is positioned proximal the second cyclone end  244 . As exemplified, cord  606  winds around the pulley  610  to connect handle  440  to cleaning member  420 . 
     As exemplified in  FIGS. 134A-134E , to translate the cleaning member  420  to a cleaned position, handle  440  is “pulled” to allow cord  606  to rotate pulley  610  in a clockwise direction. Preferably, cord  606  is kept taut to allow cord  606  to rotate the pulley  610 . For example, a friction grip, between a taut cord  606  and the pulley  610 , may cause cord  606  to rotate pulley  610  as cord  606  is pulled. While cord  606  can be pulled in any direction, in the exemplified embodiment, cord  606  is pulled axially upwardly, along translation axis  428 . As exemplified in  FIGS. 134A-134E , as the cord  606  is pulled, the second end of cord  606   b  applies an axial downward force to cleaning member  420  (e.g., provided the cyclone  170  is in an upright position wherein the first cyclone end  240  is positioned over the second cyclone end  244 ). This, in turn, translates the cleaning member  420  from a storage or operating position ( FIG. 133A ) to one or more cleaned positions ( FIGS. 134A-134E ). 
     In some cases, as exemplified in  FIG. 133B , a lateral surface  622  may depend from the cyclone sidewall  236 , and can be used as a resting surface for the handle  440 . Preferably, the lateral resting surface  622  is located proximal the first cyclone end  240 , and is used to rest handle  440  when cleaning member  420  is in the storage position. As exemplified, lateral surface  622  may include an opening  624  to receive the cord  606 . 
       FIGS. 135-136  exemplify an alternative configuration for an intermediary pulley mechanism wherein the pulley mechanism comprises two rotating pulleys  610   a  and  610   b , positioned outside the cyclone  170 . The rotating pulleys  610   a ,  610   b  may be rotatably secured to one or more depending walls  620   a ,  620   b . Preferably, as exemplified, the first pulley  610   a  is positioned proximal the first cyclone end  240 , while the second pulley  610   b  is positioned proximal the second cyclone end  244 . Optionally, pulleys  610   a ,  610   b  are aligned along a common axis (e.g., translation axis  428 ) when cyclone  170  is in the upright position ( FIG. 135B ). As best exemplified in  FIG. 135B , cord  606  winds around the first pulley  610   a , before winding around the second pulley  610   b . In the exemplified configuration, handle  440  is positioned proximal the second cyclone end  244 . 
     As exemplified in  FIG. 136 , with the first cyclone end  240  positioned over the second cyclone end  244 , handle  440  is pulled axially downwardly, along translation axis  428 , to pull cord  606 . As cord  606  is pulled, cord  606  rotates pulleys  610   a ,  610   b  in opposing directions. For example, cord  606  rotates pulley  610   a  in a counter-clockwise direction, while rotating pulley  610   b  in a clockwise direction. As the cord  606  is pulled, the cord  606  applies an axial downward force to the cleaning member  420  and translates the cleaning member  420  from an initial storage or operating position ( FIG. 135B ), to one or more cleaned position ( FIGS. 136A-136E ). 
       FIGS. 137-139  exemplify still another configuration for an intermediary pulley mechanism using a plurality of pulleys. Similar to the configuration exemplified in  FIGS. 135-136 , the configuration in  FIGS. 137-139  also includes two pulleys  610   a ,  610   b , spaced apart along axis  428 . In the exemplified configuration, however, cord  606  first winds around pulley  610   b , which is positioned proximal the second cyclone end  244 , before winding around pulley  610   a , which is positioned proximal the first cyclone end  240 . As exemplified, pulleys  610  may be rotatably mounted, at one end, to the cyclone sidewall  236  ( FIGS. 137A and 137C ). 
     As best exemplified in  FIG. 137B , a portion of cord  606 , disposed between pulleys  610   a  and  610   b , can be attached, e.g., to the cleaning member  420  (e.g., lateral portion  422  of cleaning member  420 , via aperture  602 ). 
     Optionally, as exemplified, an elongate member rod is provided, which extends along axis  428 , between a first end  438   a  and second end  438   b . Cord  606  may attach, at a first end  606   a , to the second end  438   b  of elongate rod  438 . Optionally, the first end  438   a  of elongate rod  438  includes a handle  440 . In various cases, the elongate rod  438  can reduce the length of cord  606  required to drive the pulley mechanism. 
     As exemplified in  FIGS. 138-139 , with the first cyclone end  240  positioned over the second cyclone end  244 , the cleaning member  420  is translated by pulling handle  440  and/or elongate rod  438 , axially upwardly, along translation axis  428  (or in any other suitable direction). This, in turn, causes pulleys  610  to rotate. For example, pulley  610   a  may rotate in a counter-clockwise direction, while pulley  610   b  may rotate in a clockwise direction. As the cord  606  is pulled, an axial force is applied to cleaning member  420  to translate the cleaning member  420  between a storage or operating position ( FIG. 137C ) and one or more cleaned positions ( FIGS. 138B and 139B ). 
     As exemplified in  FIG. 138 , a biasing mechanism may be provided to return the cleaning member  420  to the storage position after cleaning. In the exemplified embodiment, the biasing mechanism comprises a biased spring  587 . The biasing spring  587 , is attached at a first end  587   a  to the second end  606   b  of cord  606 . A second end  587   b  of the biasing spring  587  may be secured, for example, to the cyclone sidewall  236 . As exemplified in  FIG. 137B , the biased spring  137   b  is biased to a compressed position when the cleaning member  420  is in the storage position. As the cleaning member  420  is translated to a cleaned position ( FIGS. 138A and 139A ), spring  587  is extended. Once handle  440  and/or elongate member  438  is released, the spring  587  can retract to return the cleaning member  420  back into the storage position. 
     It will be appreciated that, while an elongate rod  438  has only been provided in the configuration exemplified in  FIG. 138-139 , the elongate member  438  can also be provided with any of the configurations previously exemplified in  FIGS. 132-136 . For example, in the previously exemplified configurations, rather than attaching a handle  440  to the first end of cord  606 , the first end of cord  606  may attach to an elongate rod  438  as exemplified in  FIGS. 137-139 . 
       FIGS. 140-141  exemplify still yet another configuration for an intermediary pulley mechanism which uses a continuous loop belt system. As exemplified, handle  440  is attached to a flexible belt  628 . Flexible belt  628  loops (e.g., winds) around, e.g., a first pulley  610   a  and a second pulley  610   b . Preferably, as exemplified, the first pulley  610   a  is located proximal the first cyclone end  240  and the second pulley  610   b  is located proximal the second cyclone end  244 . Optionally, the pulleys  610   a ,  610   b  are aligned along a common axis (e.g., translation axis  428 ). As exemplified, the pulleys  610  may be supported to one or more depending longitudinal walls  620   a ,  620   b.    
     In the exemplified embodiment, a portion of belt  628  is attached to a portion of cleaning member  420  (e.g., lateral portion  422 ), through axial gap  444  ( FIG. 140B ). In some embodiments, belt  628  may be a single “continuous” member, which extends “through” each of the handle  440  and the cleaning member  420 . In other embodiments, belt  628  can comprise one or more “discontinuous” members. For instance, as exemplified, belt  628  may comprise a first belt segment  628   a , connecting the cleaning member  420  to handle  440 , and a second belt segment  628   b , connecting the handle  440  to the cleaning member  420  ( FIG. 140B ). 
     As best exemplified in  FIG. 140B , when the cleaning member  420  is in the storage or operating position, handle  440  is disposed proximal the second pulley  610   b  (e.g., proximal the second cyclone end  244 ). As exemplified in  FIGS. 141A-141E , when the cyclone is in the upright position (e.g., the first cyclone end  240  is positioned over the second cyclone end  244 ), handle  440  is translated axially upwardly, along translation axis  428 . This, in turn, causes belt  628  to engage and rotate pulleys  610   a ,  610   b . In the exemplified configuration, pulleys  610  are rotated in the same direction (e.g., clockwise) by belt  628 . As the belt  628  is rotated, the belt  628  translates the cleaning member  420  from a storage or operating position ( FIG. 140B ), to one or more cleaned positions ( FIGS. 141A-141E ). To return the cleaning members  420  back to the storage position, handle  440  is translated in the reverse direction, and axially downwardly. 
     While the exemplified embodiments illustrate the pulley mechanisms as drivingly engaging only the cleaning member  420 , it will appreciated that the same pulley mechanisms can also drivingly engage the cleaning member  420  and shroud  212 , concurrently (i.e., in cases where the shroud  212  is attached to the cleaning member  420 ), or alternatively, only a moveable shroud  212 . 
     Further, while the exemplified embodiments illustrate the pulley mechanism as having either a single pulley ( FIGS. 132-134 ), or two pulleys ( FIGS. 135-141 ), in other embodiments, any number of pulleys may be provided. For example, cord  606  or belt  628  may wind around three, four or five pulleys. 
     Still further, while the exemplified embodiments illustrate a “pulley” in conjunction with a “cord” or “belt”, in other embodiments, any suitable pulley-type mechanism can be used to drivingly engage the cleaning member  420  and/or shroud  212 . For example, a chain and sprocket mechanism can be used in place of the cord or belt and pulley system. In particular, an advantage of the chain and sprocket mechanism is that there is reduced “slip” between the chain and the sprocket, thereby allowing the chain  606  to more fully engage and rotate the sprocket  610 . 
     In still yet other embodiments, members  610  may not comprise rotating pulley members (e.g., rotating pulleys or sprockets), but may comprise stationary members. For example, members  610  can comprise stationary knobs, and cord  606  or belt  628  can loop around the knobs  610 . In this configuration, the cord or belt simply “slides” over the surface of the knob  610  and, in turn, translates the cleaning member  420  and/or shroud  212  from the storage position to one or more cleaned position. Optionally, in this configuration, the cord or belt, and knob  610  are formed from low-friction material to facilitate “slipping” of the surfaces over each other. 
     Intermediary Gear Mechanism 
       FIGS. 142-149  exemplify still further embodiments for an intermediary mechanism which can drivingly engage a handle  440  and/or elongate rod  438  to a cleaning member  420  and/or shroud  212 , through an axial sidewall gap  444  wherein the intermediary mechanism comprises an intermediary gear mechanism. 
       FIGS. 142-143  exemplify a first configuration for the intermediary gear mechanism. As exemplified, an elongate rod  438  is provided, and extends between a first end  438   a  and an axially opposed second end  438   b , along axis  428 . The second end  438   b  attaches to the cleaning member  420  (e.g., a lateral portion  422  of the cleaning member  420 , which extends through axial gap  444 ). In other cases, any other portion of the elongate member  438  may attach to the cleaning member  420 . Optionally, a handle  440  is provided at the first end  438   a  of the elongate member  438 . Optionally, elongate rod may concurrently move the shroud and the cleaning member or only the shroud. 
     As exemplified in  FIGS. 142A and 142C , elongate member  438  includes laterally opposed faces  642   a ,  642   b , which are, at least partially, axially lined with “teeth”. The axial teeth are configured to mate (i.e., in threaded engagement) with teeth disposed on rotating gears  632   a ,  632   b . As exemplified, gears  632  are provided outside cyclone  170 , and on either side of rod  438 . In the exemplified embodiment, gears  632   a ,  632   b , are provided proximal the first cyclone end  240 . In other cases, gears  632  may be provided at any other location along, or beyond, the axial length of cyclone  170 . As exemplified, gears  632  may be rotationally supported on cyclone sidewall  236 . Preferably, in the upright cyclone position (e.g., the first cyclone end  240  is positioned over the second cyclone end  244 ), gears  632  are aligned along the same horizontal axis. 
     As exemplified in  FIGS. 143A-143E , the elongate rod  438  is translated, along axis  428 , toward the second cyclone end  244 , to translate the cleaning member  420  into a cleaned position. As the elongate rod  438  is translated, teeth disposed along lateral faces  642  of the elongate rod  438  engage gears  632 . This, in turn, causes gears  632  to rotate in opposing directions. In the exemplified embodiment, gear  632   a  rotates in a clock-wise direction, while gear  632   b  rotates in a counter-clockwise direction ( FIG. 142C ). 
     As the elongate member  438  is translated toward the second cyclone end  244 , the elongate member  438  axially translates the cleaning member  420  from the storage or operating position ( FIG. 142B ), to one or more cleaned positions ( FIGS. 143A-143D ). To return the cleaning member  420  to the storage or operating position, the elongate rod  438  is translated, in reverse, axially away from the second cyclone end  244 . 
     It will be appreciated that an advantage of the exemplified gear configuration is that the friction fit between teeth disposed on rod  438  and gears  632  allows the cleaning member  420  to be secured at various intermediate cleaned positions. In other words, the friction fit between teeth on rod  438  and gears  632  may prevent the cleaning member  420  from collapsing, under the influence of gravity, inside of the cyclone chamber  176 , at different cleaned positions. 
     While two gears  632  have been exemplified in  FIGS. 142-143 , it will be appreciated that any number of gears may be provided to engage teeth along the elongate rod  438  (e.g., one, two, three, or four gears). The gears  632  may be positioned at any location along, or beyond, the axial length of the cyclone  170 . 
       FIGS. 144-147  exemplify another configuration for an intermediate gear mechanism. In the exemplified configuration, two elongate members  438   1 ,  438   2  are provided, each extending axially between a respective first end  438   a   1 ,  438   a   2  and a respective second end  438   b   1 ,  438   b   2 , along axis  428 . The second end  438   b   2 , of the second elongate member  438   2 , is attached to a lateral portion  422  of cleaning member  420 , extending through axial gap  444  ( FIGS. 144 and 145A ). Alternatively, any other portion of the second elongate member  438   2  may attach to the cleaning member  420 . Optionally, the first end  438   a   1 , of elongate member  438 , include a grip handle  440 . 
     As exemplified, each elongate member  438  includes a respective lateral face  642   1  and  642   2 , which is axially lined with teeth. A rotating gear  632  is disposed between the elongate members  438 , and includes teeth which are in threaded engagement with teeth disposed on each elongate member  438 . As exemplified, gear  632  may be supported to cyclone sidewall  236 , and may be positioned proximal the first cyclone end  240 . While only a single gear is exemplified, in other cases, any number of gears may be provided and positioned between the first and second elongate members  438 . The gears may also be positioned at any point along, or beyond, the axial length of cyclone  170 . 
     As exemplified, in the storage or operating position ( FIG. 145B ), the first end  438   a   1 , of the first elongate member  438   1 , is located more proximal to the first cyclone end  240 , than the first end  438   a   2  of the second elongate member  438   2 . 
     As exemplified in  FIGS. 146-147 , to translate the cleaning member  420  to a cleaned position (e.g., with the cyclone in the upright position), the first elongate member  438   1  is pulled axially upwardly. This, in turn, causes teeth disposed on the lateral face  642   1  of the first elongate member  438   1  to engage and rotate gear  632  (i.e., translating the linear axial movement of the elongate member, into rotational gear movement). As the gear  632  rotates, threaded engagement between gear  632  and teeth on the second elongate member  438   2  causes the second elongate member  438   2  to translate axially downwardly (i.e., translating rotational gear movement back into linear axial movement of the elongate member). Accordingly, the second elongate member  438   2  is translated downwardly, and translates the cleaning member  420  from the storage or operating position ( FIG. 145B ) to one or more cleaned position ( FIGS. 146B and 147B ). 
     As exemplified in  FIG. 147A , in the cleaned position, the first end  438   a   1  of the elongate member is located more distally from the first cyclone end  240  than the first end  438   a   2  of the second elongate member. 
     To return the cleaning member  420  back into the storage position, the first elongate member  438   1  may be translated, in reverse, axially downwardly. 
     While the exemplified configurations illustrate the gear mechanism as driving the cleaning member  420  through an axial sidewall gap  444 , in other embodiments, the gear mechanism can also drivingly engage the cleaning member  420  through an opening in the first or second cyclone ends, such as in a similar as previously discussed with respect to the driving assembly extending through first or second cyclone end.  FIGS. 148-149  exemplify a configuration for an intermediate gear mechanism which drivingly engages the cleaning member  420  through the first cyclone end. 
     As best exemplified in  FIG. 148 , in this configuration, the elongate rod  438  extends into the cyclone chamber  176 , through the cyclone air outlet  204 . Optionally, as exemplified, shroud  212  can extend along the axial length of cyclone  170 . As exemplified, when cleaning member  420  is in the storage position ( FIG. 148B ), the second end  438   b  of rod  438  engages (e.g., abuts) an axially inward end  212   a  of shroud  212 . In other cases, rod  438  can be shorter than shroud  212 , and may not abut the inward end  212   a  of shroud  212 . In still other cases, shroud  212  may have a shorter length and may not extend along the axial length of cyclone  170  (e.g., it may engage the shroud proximate end  212   b  od shroud  212 ). 
     As exemplified, elongate rod  438  includes lateral faces  642   a ,  642   b . Each lateral face  642  is at least partially axially lined with teeth. Teeth on lateral faces  642  are in threaded engagement with teeth on rotating gears  632   a ,  632   b . In the exemplified embodiment, gears  632  are rotationally mounted inside cyclone  170 . For example, gears  632  are rotationally mounted inside shroud  212  (e.g., a non-permeable portion of shroud  212 ). In the upright cyclone position (e.g., the first cyclone end  240  is positioned over the second cyclone end  244 ), gears  632  are preferably aligned along a common horizontal axis. In other cases, gears  632  may be laterally offset, i.e., along different horizontal axis, or may be positioned at any other location along the axial length of cyclone  170 . It will be appreciate that, in other embodiments, the gears may be located elsewhere. 
     As exemplified, a hollowed stem  648  is attached, at one end, to the cleaning member  420 . Hollowed stem  648  extends axially upwardly from the first cyclone end  240 , along cyclone axis  232 . In the exemplified embodiment, hollowed stem  648  at least partially surrounds the elongate rod  438 . As exemplified in  FIG. 148C , the inner surface of hollowed stem  648 , is axially lined with teeth  652   a ,  652   b . Teeth  652  engage an outer edge of gears  632   a ,  632   b , opposite the edge engaging lateral faces  642  of elongate rod  438 . Accordingly, each gear  632  is positioned between the elongate rod  438 , and an inner surface of the hollowed stem  648  lined with teeth. It will be appreciate that, in other embodiments, a hollowed stem  648  may not be provided. In such a case, the elongate rod may be connected to the cleaning member via an axial gap in the shroud. 
     As exemplified in  FIGS. 149A-149E , in the upright cyclone position, the cleaning member  420  is translated into a cleaned position by pulling the elongate rod  438 , axially upwardly. This, in turn, causes teeth, disposed on the elongate rod  438  (i.e., lateral faces  642 ), to engage gears  632 , and to cause rotation of gears  632 . For example, gear  632   a  is rotated in a counter-clockwise direction, while gear  632   b  is rotated in a clockwise direction. Gears  632 , in turn, engage teeth  652 , lining the inner surface of hollow stem  648 . As gears  632  rotate, and engage teeth  652  along hollow stem  648 , the gears&#39; rotational motion is translated into linear motion of the hollow stem  648 . In particular, the hollow stems  648  is translated axially downwardly, into the cyclone chamber  176 , such as to move the cleaning member  420  from a storage or operating position ( FIG. 148B ), to one or more cleaned positions ( FIGS. 149A-149E ). 
     To return the cleaning member  420  back into the storage position, the elongate rod  438  can be translated, in reverse, axially downwardly. This, in turn, reverses rotation of gears  632 , and accordingly, translates the hollow stem  648  and cleaning member  420  back into the storage position. 
     It will be appreciated that while the configuration exemplified in  FIGS. 148-149  has been exemplified with an upright cyclone, the same configuration can be applied to an inverted cyclone, where the air outlet  204  is provided at the second cyclone end  244 . 
     Further, while the illustrated embodiments exemplify the gear system as translating only the cleaning member  420 , in other cases, the gear system can translate the cleaning member  420  and shroud  212 , concurrently. For example, this can occur where the shroud  212  is attached to the cleaning member  420 . In other cases, where a cleaning member  420  is not provided, the gear system can drivingly engage only a moveable shroud  212 . 
     Further, in other embodiments, the elongate rod  438  may extend through an opening in the end wall of the cyclone chamber. 
     Intermediary Pneumatic or Hydraulic Mechanism 
       FIGS. 150-156  exemplify still another embodiment for an intermediary mechanism which drivingly engages a handle  440  and/or elongate rod  438  to a cleaning member  420  and/or shroud  212  wherein the intermediary mechanism comprises a pneumatic or hydraulic mechanism. 
       FIGS. 150-151  exemplify a first configuration for an upright hydraulic or pneumatic mechanism in which the hydraulic or pneumatic system includes a first elongate member  438   1  and a second elongate member  438   2 . The first elongate member  438   1  is slidably received inside of a first cylinder  658   1 . The second elongate member  438   2  is slidably received inside of a second cylinder  658   2 . In the exemplified embodiment, the elongate members  438  and cylinders  658  are configured with a circular cross-section. Preferably, the ‘cross-sectional diameter’ of the elongate members  438  is substantially equal to the ‘cross-sectional diameter’ of cylinders  658 , to provide for a “sealed” sliding engagement between the two components. In other embodiments, the elongate members  438  and cylinders  658  may have any other suitable cross-sectional design (e.g., a rectangular cross-section, or a triangular cross-section, etc.) 
     As exemplified in  FIG. 150 , each cylinder  658  axially extends between a respective first end  658   a   1 ,  658   a   2 , and an axially spaced apart second end  658   b   1 ,  658   b   2 . The first elongate member  438   1  is slidably received through an opening at the first end  658   a   1 , of the first cylinder  658   1 . Similarly, the second elongate member  438   2  is slidably received through an opening at the second end  658   b   2  of the second cylinder  658   2 . As exemplified, the second end  438   b   2 , of the second elongate member  438   2 , is drivingly engaged to the cleaning member  420  (e.g., portion  422 , which may laterally extend from cleaning member  420  through axial sidewall gap  444 ) ( FIG. 151A ). 
     As exemplified in  FIG. 151 , the first cylinder  658   1  is in fluid communication with the second cylinder  658   2  through an intermediate tube  658   3 . Tube  658   3  connects an opening, provided at the second end  658   b   1  of the first cylinder  658   1 , to an opening provided at the first end  658   a   2  of the second cylinder  658   2 . The internal volume of cylinders  658   1 ,  658   2  and tube  658   3  is filled with a compressible fluid (e.g., a hydraulic system) or a pressurized gas medium (e.g., a pneumatic system). 
     Optionally, the second end  658   b   2  of the second cylinder  658   2  is secured to a lateral portion  622 , which depends from the cyclone sidewall  236  ( FIG. 150 ), proximal the first cyclone end  240 . 
     In the storage position ( FIG. 151A ), the first elongate member  438   1  at least partially extends out of the first cylinder  658   1 , while the second elongate member  438   2  is at least partially received inside of the second cylinder  658   2 . 
     As exemplified in  FIGS. 151B-151C , in the upright cyclone position, the cleaning member  420  is translated into the cleaned position by compressing (e.g., sliding axially inwardly) the first elongate member  438   1  into the first cylinder  658   1 . This, in turn, applies a positive compressive pressure to the fluid or gas medium inside the connected system (i.e., cylinders and tube system  658 ). The positive compressive pressure, in turn, forces (i.e., pushes) the second elongate member  438   2 , axially outwardly of the second cylinder  658   2  ( FIGS. 151B and 151C ). In this manner, the second elongate member  438   2  axially translates the cleaning member  420  from the initial storage or operating position ( FIG. 151A ), to one or more cleaned positions ( FIGS. 151C and 151C ). 
     When it is desired to return the cleaning member  420  back to the storage position, the first elongate member  438   1  is reversed, and extended (i.e., pulled) out of the first cylinder  438   1 . This, in turn, results in a build-up of negative pressure inside of the connected system, and drives the second elongate member  438   2  to retract into the second cylinder  658   2  (e.g., to translate the cleaning member  420  back into the storage position). 
       FIGS. 152-153  exemplify an alternative configuration for an intermediary pneumatic or hydraulic mechanism which operates inversely to the configuration exemplified in  FIGS. 150-151 . In particular, in the storage position ( FIG. 153A ), the first elongate member  438   1  is substantially received inside of the first cylinder  658   1 . Further, the second elongate member  438   2  is substantially extended out of the second cylinder  658   2 . In the exemplified embodiment, the second cylinder  658   2  is secured, at one end, to a depending lateral wall  622   b , located proximal the second cyclone end  244  ( FIG. 152 ). 
     As exemplified in  FIGS. 153B-153C , in the upright cyclone position, the cleaning member  420  is translated by extending (i.e., pulling) the first elongate member  438   1  out of the first cylinder  658   1 . This, in turn, generates a build-up of negative pressure inside the connected system (i.e., cylinders and tube  658 ). The build-up of negative pressure draws the second elongate rod  438   2  into the second cylinder  658   2 . As the second elongate rod  438   2  is drawn into cylinder  658   2 , the second elongate rod  438   2  translates the cleaning member  420  from the storage or operating position ( FIG. 153A ) to one or more cleaned positions ( FIGS. 153B and 153C ). 
     To return the cleaning member  420  back into the storage position, the first elongate member  438   1  is inserted (i.e., slidably translated) into the first cylinder  658   1 . This generates a build-up of positive pressure which drives the second elongate member  438   2  to slide out of the second cylinder  658   2 , and to translate the cleaning member  420  back into the storage position. 
     While the exemplified configurations ( FIG. 150-153 ) illustrate a pneumatic or hydraulic system drivingly engaging a cleaning member  420 , it will be appreciated that, in other embodiments, the pneumatic or hydraulic system can also drivingly engage both the cleaning member  420  and shroud  212  (e.g., in cases where shroud  212  is attached to cleaning member  420 ). Alternatively, where no cleaning member  420  is provided, the pneumatic or hydraulic system can drivingly engage only a moveable shroud  212 . 
       FIGS. 154-156  exemplify a configuration for an intermediary pneumatic or hydraulic mechanism which drivingly engages only a moveable shroud  212 . In the exemplified configuration, a single cylinder  658   1  is connected, at one end  658   b   1 , to a connecting tube  658   3  ( FIGS. 154A and 154B ). Connecting tube  658   3  is connected, at an opposite end, to cyclone  170 , and is in fluid communication with a passage  650 , located inside the cyclone  170 . As exemplified, passage  650  may be located along the first cyclone end  240 , above the shroud  212 . 
     As exemplified in  FIG. 154C , passage  650  feeds into a first pipe member  656  which extends, at least part way, inside of shroud  212 , when shroud  212  is in the storage position. In the storage position, a second pipe member  657  is nested inside the first pipe member  656 . Each of the first and second pipe members  656 ,  657  extend, along axis  232 , between a respective first end  656   a ,  657   a  and a respective second end  656   b ,  657   b . The first end  656   a , of pipe member  656 , is in fluid communication with passage  650 . The second end  657   b , of second pipe member  657 , is attached to an axial inner end  212   a  of shroud  212 . 
     As exemplified in  FIGS. 154B and 154C , in the storage position, the second pipe member  657  is nested, at least partially, within the first pipe member  656 . Further, the elongate member  438  is substantially removed from the cylinder  658   1 . 
     As exemplified in  FIGS. 155-156 , when the cyclone  170  is in the upright position, the moveable shroud  212  is translated into a cleaned position by compressing (e.g., sliding) the elongate member  438 , into cylinder  658   1 , to generate positive pressure inside the connected system. The positive pressure causes pressurized gas or liquid to flow from tube  658   3  into cyclone passage  650 . From the cyclone passage  650 , the pressurized medium flows into the second pipe member  657 , and forces the second pipe member  657  to telescope out of the first pipe member  656 . In this manner, the shroud  212  is axially translated from the storage position ( FIG. 154B ), to one or more cleaned positions ( FIGS. 155-156 ). In some cases, a friction fit engagement between the outer surface of the second pipe member  657 , and the inside surface of the first pipe member  656 , prevents the second pipe member  657  from collapsing (e.g., sliding) out of the first pipe member  656 . In other cases, any other retention structure or mechanism can be used to secure the second pipe member  657  inside the first pipe member  656  in a telescoping arrangement, as, for example, explained in further detail herein with reference to  FIG. 103 . 
     It will be appreciated that while the exemplified pneumatic or hydraulic designs are shown as drivingly engaged to the cleaning member  420  and/or shroud  212  through an axial sidewall gap  444 , in other cases, the exemplified pneumatic or hydraulic systems can also be used where the elongate member  438  extends, for example, through the first cyclone end  240  or second cyclone end  244 , as previously exemplified. For example, the second elongate member  438   2 , exemplified in  FIGS. 150-153 , can extend through an opening  802  in the first cyclone end (e.g.,  FIGS. 150-151 ), or the second cyclone end (e.g.,  FIGS. 152-153 ), to drivingly engage the cleaning member  420  and/or shroud  212 . 
     Intermediary Bowden Cable Mechanism 
       FIGS. 157-160  exemplify another embodiments for an intermediary mechanism, which drivingly engaging a handle  440  and/or elongate member  438  to a cleaning member  420  and/or shroud  212  wherein the intermediary mechanism comprises a Bowden cable system. 
       FIGS. 157-158  exemplify a first configuration for the Bowden cable system. As exemplified, the system includes a flexible elongate member (or flexible cable)  438 , which extends between a first end  438   a  and a second end  438   b . The second end  438   b  of may attach to the cleaning member  420  (e.g., to a lateral portion  422  of cleaning member  420 , which may extend through axial gap  444 ). In other cases, any other portion of the flexible member  438  may attach to the cleaning member  420 . 
     As exemplified, the flexible member  438  travels, at least partially, through a hollow flexible sleeve  626 . The sleeve  626  may have a first open end  626   a , to receive the flexible member  438 , and a second open end  626   b , through which the flexible member  438  exits the sleeve  626 . In the exemplified embodiment, the second end  626   b  is secured to a depending lateral portion  622   a  of cyclone sidewall  236 . 
     In the exemplified configuration, and as best exemplified in  FIGS. 158A-158E , mechanical force, or energy, is translated to the cleaning member  420  by movement of the flexible member  438  relative to the outer sleeve  626 . In particular, this allows translation of the cleaning member from a storage or operating position ( FIG. 158A ) to one or more cleaned positions ( FIGS. 158B-158E ). 
     Optionally, a portion of the flexible member  438  may comprise a spring member. For example, as exemplified in  FIG. 157B , the flexible member  438  may comprise at least two solid portions  604   a  and  604   c , located proximal the first and second ends  438   a ,  438   b , respectively. Further, a middle portion  604   b , disposed between portions  604   a  and  604   c , may comprise a spring member. 
     Optionally, a spring may be provided between handle  440  and sleeve end  262   a  to bias the handle  440  to the operating position shown in  FIG. 157B . 
       FIGS. 159-160  exemplify another configuration of the Bowden cable design which does not include an outer sleeve  626 , and only includes the flexible member  438 . 
     While the exemplified embodiments illustrate the Bowden cable design as drivingly engaging only the cleaning member  420 , the Bowden cable design can also be used to translate the cleaning member  420  and shroud  212 , concurrently, or otherwise to translate only a moveable shroud  212 . 
     Further, it will be appreciated that while the exemplified Bowden cable design is exemplified as being drivingly engaged to the cleaning member  420  and/or shroud  212  through an axial sidewall gap  444 , the Bowden cable design can also be used where the elongate member  438  extends through the first cyclone end  240  or second cyclone end  244 , as previously exemplified. For example, the elongate member  438  can extend through an opening  802  in the first or second cyclone end to drivingly engage the cleaning member  420  and/or shroud  212 . 
     B. Driving Assembly Engaging Cleaning Member and/or Shroud without Extending Through Cyclone Sidewall 
     As exemplified in  FIGS. 130-131 , a driving assembly  436  may drivingly engage the cleaning member  420  and/or shroud  212  without extending (e.g., penetrating) through the cyclone sidewall  236 . 
     In the exemplified configuration, the driving assembly  436  comprises an external handle  440  (e.g., disposed outside cyclone  170 ), which drivingly engages the cleaning member  420  through magnetic coupling. As exemplified, a magnet pair is provided which includes a first magnet  584   a , disposed, e.g., on an inner surface  441   a  of handle  440 , facing the cleaning member  420 . A second magnet  584   b  is disposed, e.g., on a radial outer surface  420   a  of the cleaning member  420  and directed towards the handle  440 . The magnets  584   a ,  584   b  are configured with opposite polarities to induce a magnetic attractive coupling force. When the cyclone is in the upright position (e.g., the first cyclone end  240  is positioned over the second cyclone end  244 ), magnets  584   a  and  584   b  are aligned along a common vertical and horizontal axis. As exemplified in  FIGS. 131A-131D , the magnetic coupling between magnets  584  allows the external handle  440  to axially translate cleaning member  420  between an initial storage or operating position ( FIG. 130 ) and one or more cleaned positions ( FIGS. 131A-131D ). 
     While the exemplified embodiment illustrates a portion of handle  440  extending through sidewall gap  444 , it will be appreciated that the exemplified magnetic coupling design can operate without any gap or opening in the cyclone sidewall  236 . This is because coupling between magnets  584  can operate through the cyclone sidewall. An advantage of this configuration is that it avoids the need to seal an opening or gap in the cyclone sidewall  236 , during operation of the air treatment member  116 . 
     Additionally, while the exemplified embodiments illustrate a single magnet pair coupling handle  440  to cleaning member  420 , in other embodiments, any number of magnets (or magnet pairs) can be provided on handle  440  or cleaning member  420 , to generate a magnet coupling force. 
     Still further, it will be appreciated that magnetic coupling may be achieved without disposing a magnet on each of the handle  440  and cleaning member  420 . For example, magnetic coupling can still be achieved by disposing one magnet on handle  440  or cleaning member  420 , and disposing a magnetically attractable material (e.g., a ferromagnetic material) on the opposing surface. For example, the cleaning member could be made of such a material. 
     While the exemplified embodiment illustrate the handle  440  as drivingly engaging only the cleaning member  420 , in other cases, the handle  440  may drivingly engage both the cleaning member  420  and shroud  212  (e.g., where the shroud  212  is attached to the cleaning member  420 ). Alternative, where no cleaning member  420  is provided, the handle  440  may drivingly engage only the shroud  212 . 
     The magnetic coupling configuration, exemplified in  FIGS. 130-131  can be applied to any of the previously exemplified configurations which comprise a driving assembly  436 . In particular, magnetic coupling can allow coupling of the driving assembly  436  to the cleaning member  420  and/or shroud  212  without an axial gap  444  in the cyclone sidewall  236 . 
     Stop for Limiting Axial Translation of Cleaning Member and/or Shroud 
     Optionally, irrespective of the driving assembly used to translate the cleaning member  420  and/or shroud  212  from a storage (or operating) position, to one or more cleaned positions, a stopping mechanism may be provided to limit axial movement of the shroud  212  and/or cleaning member  420 . 
       FIGS. 128-129  exemplify a configuration for limiting axial movement of the shroud  212  wherein each of the shroud and the cleaning member may be moved concurrently and, optionally, wherein the cleaning member may be moved separately from the shroud. In order to enable the shroud and the cleaning member to move concurrently and, subsequently, for the cleaning member to move independent of the shroud, the cleaning member is removably attachable to the shroud or a member attached to the shroud (e.g., a plate  562 ). Cleaning member may be removably attachable to the shroud or a member attached to the shroud by magnets or mechanical inter-engagement members that are releasably connected together. 
     In the exemplified configuration, the driving assembly  436  comprises a handle  440  in driving engagement with the cleaning member  420 , through axial gap  444 . As best exemplified in  FIG. 129 , a plate  562  surrounds and is attached to an axial outer end  212   b  of shroud  212 . As exemplified, a stop structure  565  depends laterally from the plate  562  (e.g., from a radial outer edge of plate  562 ), and extends across axial sidewall gap  444 . 
     In the storage or operating position ( FIG. 128 ), the plate  562  is positioned axially above the cleaning member  420  (e.g., assuming the cyclone  170  is in an upright position), and the stop structure  565  overlies the handle  440 . 
     From the initial storage or operating position, the shroud  212  and cleaning member  420  (which as exemplified is attached to the plate by magnetic coupling between plate  562  and the cleaning member  420 ) are concurrently translated, part or all the way along the axial length of the cyclone chamber  176 , into a cleaned position ( FIG. 129A ) by handle  440 . 
     As exemplified in  FIG. 129A , the plate  562  may include one or more magnets  569 . Magnets  569  on plate  562  are attracted to plate  560 , disposed on an axial upper surface of the cleaning member  420 . Plate  560 , may be at least partially, comprised of magnetically attractable material (e.g., a magnet of an opposite polarity to magnets  569 , or otherwise, a ferromagnetic material). Alternatively, rather than proving a plate  560 , the cleaning member  420  may be formed of a magnetically attractable material (or at least a portion of the cleaning member  420  directed to plate  562 ). In still other cases, plate  560  or cleaning member  420  may be formed of a magnetic material, and elements  569  may comprise a ferromagnetic material. The cleaning member  420  and shroud  212  may also be detachable connected to each other in any other suitable manner known in the art. 
     As exemplified, magnetic coupling between plates  560  and  562  allows the shroud  212  to concurrently translate with the cleaning member  420 , as handle  440  is axially translated. 
     As exemplified in  FIG. 128 , a grooved (e.g., indented portion)  578  can be formed along a depending wall  620 , which laterally depends from cyclone sidewall  236 . As exemplified in  FIG. 129B , when the shroud  212  is translated downwardly to the axial height of grooved portion  578 , the stopping structure  565  engages (e.g. abuts) the grooved portion  578 , and the grooved portion  578  delimits further downward axial movement of the shroud  212 . 
     Handle  440  of cleaning member has a narrower portion that extends through the gap  444  than stopping structure  565 . Accordingly, as further exemplified  FIG. 129B , upon engagement of the stopping structure  565  with the grooved portion  578 , cleaning member  420  magnetically de-couples from magnets  569  on plate  562 . The cleaning member  420  may be accordingly further translated into a cleaned position ( FIGS. 129C and 129D ) via handle  440 , while the shroud  212  is retained in an intermediate cleaned position. 
     An advantage of this configuration is that the shroud  212  can be translated part-way into the cleaned position, so as to allow access to shroud  212  when door  352  is opened. Further, while the shroud  212  is retained in the intermediate cleaned position, the cleaning member  420  can continue de-briding the exterior of the shroud  212  from dirt and debris, by translating axially along the shroud surface ( FIGS. 129C-129D ). 
     In other embodiments, rather than limiting axial movement of only the shroud  212 , the stopping mechanism can delimit axial movement of both the cleaning member  420  and shroud  212 . For example, in embodiments where the cleaning member  420  and shroud  212  are not detachably connected, the shroud  212  and cleaning member  420  can translate concurrently. Stopping structure  565  can then engage grooved portion  578  to limit axial movement of the cleaning member  420  and shroud  212 . Alternately, the portion of handle  440  that extends through the gap  444  may engage stopping structure  565 . Alternately, a second stopping structure may be provided axially spaced from stopping structure  565  to limit the axial movement of cleaning member  420  after cleaning member has detached from shroud  212 . 
     While the exemplified embodiments illustrate the stopping mechanism being used in conjunction with a handle  440 , which extends through axial sidewall gap  444 , it will be appreciated that, in other cases, the stopping mechanism can be applied to any of the previously exemplified driving assemblies. For example, where the handle assembly  436  does not extend through axial gap  444 , the stopping structure  565  can be located inside the cyclone chamber  176 , and can engage a grooved portion formed on the inner surface of the cyclone sidewall  236 . For example, the driving assembly  436  can comprise a rod  438 , which extends through the first or second cyclone ends. The rod can drivingly engage the cleaning member  420 . In particular, the rod  438  can pass through shroud plate  562  (e.g., an opening in the shroud plate  562 ) to drivingly engage the cleaning member  420 . In this configuration, the rod  438  can translate the shroud  212  and cleaning member  420 , part way along the chamber&#39;s axial length. Once stopping structure  565  engages a grooved portion of sidewall  236 , rod  438  can continue translating only the cleaning member  420 . 
     Biasing Mechanism for Securing Cleaning Member and/or Shroud in Cyclone “Use” or Storage Position: 
     Optionally, irrespective of the driving assembly  436  used to translate the cleaning member  420  and/or shroud  212  from a storage position to one or more cleaned positions, a biasing mechanism can be provided to bias one or more of the cleaning member  420  and shroud  212  in a storage or cyclone “in-use” position. An advantage of the biasing mechanism is to prevent the cleaning member  420  and/or shroud  212  from collapsing inside the cyclone chamber  176 , e.g., under gravitational force, during storage or cyclone use. 
       FIGS. 126-127  exemplify a first configuration for the biasing mechanism which uses magnets. In the exemplified configuration, one or more magnets  564  are disposed at the first cyclone end  240 . As exemplified, magnets  564  may be secured inside retention members  568  (retention members  568  secure magnets  564  in position). As further exemplified, a plate  560  may be disposed over at least a portion of the cleaning member  420  which is directed to the first cyclone end  240 . In the exemplified embodiment, plate  560  is formed, at least partially, from a magnetically attractable material (e.g., another magnet or a ferromagnetic material), which is attractable to magnets  564 . In other embodiments, rather than providing a plate  560 , all or a portion of the cleaning member  420 , which is directed to the first cyclone end  240 , and aligned with magnets  564 , may be formed of magnetically attractable material. 
     As exemplified in  FIG. 126A , the magnetic attraction between magnets  564  and plate  560  retains the cleaning member  420  in the storage or cyclone use position. When it is desired to translate the cleaning member  420  to one or more cleaned positions, an axial force is applied (e.g., by driving assembly  436 ) to de-couple magnets  564  from plate  560 , and to allow translation of the cleaning member  420  to one or more cleaned positions ( FIGS. 126B-126D ).  FIGS. 127A-127D  exemplify a similar configuration where the shroud  212  is concurrently moveable with the cleaning member  420 . In other cases, magnet biasing can also be used to bias only a moveable shroud  212 , in the storage or cyclone use position. 
     It will be appreciated that, in other embodiments, rather than using magnets  564 , a ferromagnetic material can be disposed at the first cyclone end  240 , and plate  560  (or a portion of the cleaning member  420 ) may comprise a magnetic material. For example, magnets  564  may be provided on the cleaning member  420  or a plate  560  and the end wall of the cyclone chamber may be made of or provided with a magnetically attractable material. 
       FIGS. 133-134  exemplify another configuration for a biasing mechanism which comprise a spring. In the exemplified configuration, the biasing mechanism comprises a biasing spring  586 , which is biased to a compressed position ( FIG. 133B ). As exemplified, spring  586  can be received within a hollow interior of a spring retention member  592 , provided at the first cyclone end  240 . In this configuration, spring  586  may be secured in position such as by being attached at a first end to a closed end  593  of retention member  592 , and may be attached at a second end to the cleaning member  420 . As exemplified in  FIGS. 134A-134E , as the cleaning member  420  is translated to a cleaned position, the spring  586  expands. Once handle  440  is released, the biased spring  586  retracts so as to automatically translate the cleaning member  420  back into the storage position. An advantage of this configuration is that the user is not required to manually return the cleaning member  420 , back to the storage position, after cleaning. 
     It will be appreciated that, in other embodiments, the configuration exemplified in  FIGS. 133-134  can also be used to bias a moveable cleaning member  420  and shroud  212 , or a moveable shroud  212 , into the storage or cyclone use position. 
       FIGS. 162-163  exemplify still another configuration for a biasing spring. In the exemplified configuration, a spring  682 , which is biased in the compressed position ( FIG. 162B ), is provided inside the cyclone chamber  176  and extends between the first cyclone end  240  and a plate  562 , attached around an axial outer end  212   b  of shroud  212 . As exemplified in  FIGS. 163B-163C , as the shroud  212  is translated to a cleaned position, the spring  682  expands. Once handle  440  is released, the biased spring  682  may retract so as to automatically translate the shroud  212  back into the storage position. 
     It will be appreciated that, in other embodiments, the exemplified configuration in  FIGS. 162-163  can also be used to bias a moveable cleaning member  420 , or the combination of a cleaning member  420  and shroud  212 , into the storage or cyclone use position. 
     Driving Assembly Re-Configurable Between Storage Position and Use Position: 
     Optionally, the driving assembly  436  can be re-configurable between a storage position, and a use or operating position, wherein in the use position, the driving assembly is drivingly connected to the cleaning member and/or shroud, and the cleaning member and/or shroud are in the storage position (for when the surface cleaning apparatus is used for cleaning). The driving assembly or handle may be pivotally moveable, telescopically moveable, translatably moveable or rotatably moveable between the use and storage positions. Alternately, or in addition, the driving assembly may be flexible so as to enable the assembly to be moved into a storage position. 
       FIGS. 109-110  exemplify a first embodiment for a re-configurable driving assembly  436  wherein the driving assembly comprises two pivotally connected portions. In the exemplified configuration of  FIG. 109 , the driving assembly  436  comprises an elongate member  438  which includes a first member portion  438   1  that is pivotally connected to a second member portion  438   2  by hinge  490 . As exemplified, when the cleaning member  420  and/or shroud  212  are in the storage position (e.g.,  FIG. 105 ), the first portion  438   1  can pivot relative to the section portion  438   2 , about pivot axis  491 , between a storage position ( FIG. 109A ) and an extended use position ( FIG. 109B ). As exemplified, in the storage position, the first portion  438   1  is recessed towards the cyclone sidewall  236 . In various cases, this allows the air treatment member  116  to be stowed away for storage in small or tight compartments, e.g., when the surface cleaning apparatus is in use or in placed in a closet for storage. 
       FIG. 110  exemplifies an alternative configuration in which the first member portion  438   1  is pivotally connected to the second member portion  438   2  by two hinges  490   a ,  490   b . As exemplified, the hinges  490  may be interposed by a third member portion  438   3 . An advantage of this configuration is that, in the storage position ( FIG. 110A ), the first member portion  438   1  is co-extensive with, may be located along side or spaced from and adjacent) the cyclone sidewall  236 . Accordingly, and in contrast to the configuration of  FIG. 109A , in which where the first member portion  438   1  is angled away from the cyclone sidewall  236 , the configuration of  FIG. 110A  allows the air treatment member  116  to occupy less storage area when stowed away in small or tight compartments. This configuration also inhibits damage to the elongate member  438  when stowed away for storage by preventing the first member portion  438   1  from colliding with surrounding objects (e.g., because the member is not angled away from the cyclone chamber). 
       FIGS. 87-88 and 103  exemplify still another embodiment for a re-configurable driving assembly  436  which uses a telescoping member. Any telescoping structure may be used. Accordingly, the driving assembly may be reconfigured (telescoped) from a position in which a handle of the driving assembly is located at or proximate a surface of the surface cleaning apparatus (a storage position) to a position in which that driving assembly is operable to move the cleaning member and/or shroud (the operating position). An advantage of this design is that the driving member is less likely to be damaged when the surface cleaning apparatus is in use as the driving assembly (e.g., the handle) is retracted. This design may be used with any axially extending driving assembly disclosed herein. 
     In the exemplified embodiment ( FIGS. 87 and 88 ), the driving assembly  436  comprises an elongate member  438  which has a telescoping configuration to allow rod  438  to expand from a storage position to an extended use position. 
     In particular, as exemplified, the rod  438  can comprise a first portion  438   1  which telescopes over a second portion  438   2  ( FIG. 87 ), or a first portion  438   1  which telescopes inside a second portion  438   2  ( FIG. 103 ) The first portion  438   1  may collapse over or into the second portion  438   2  to reduce the axial height  450  of the elongate member (e.g.,  FIGS. 87A and 87E ) when the surface cleaning apparatus is in use. This may allow the air treatment member  116  to be stowed away for storage in small or tight compartments. The first portion  438   1  may also expand from the second portion  438   2  to increase the axial height  450  of the elongate member (e.g.,  FIGS. 87B-87D and 88 ). This may allow the elongate member  438  to move the cleaning member  420  inside of the cyclone chamber over greater axial distances. 
     As exemplified, when the cleaning member  420  and/or shroud  212  are in the storage position ( FIG. 87A ), the elongate member  438  may start from an initial retracted storage position. The elongate member  438  may then be expanded to an in-use position ( FIG. 87B ), and used to translate the cleaning member  420  and/or shroud  212  to one or more cleaned position ( FIGS. 87C and 88 ). When it is desired to return the elongate member  438  back into the retracted storage position, the cleaning member  420  is first returned to the storage position ( FIG. 87D ), and the elongate member  438  is then retracted back into the retracted storage position ( FIG. 87E ). 
     In some cases, an activation mechanism (e.g., a button) can be provided to expand or retract the member  438 . The activation mechanism can be provided, for example, on the first end  438   a  of the elongate member  438 . 
     As exemplified in  FIG. 103 , the activation mechanism may comprise a rod  704 , which extends inside the hollowed interior of the first elongate member  438   1 . The rod  704  can include a depressible button  702 , at a first end  704   a , and a catch member  706 , at a second  704   b , wherein the catch member  706  is configured as an ‘inverted fork’. 
     To expand the elongate member  438 , button  702  is depressed downwardly, along translation axis  428  ( FIG. 103B ). This allows catch fork  706  to engage an oblong lock structure  708 . The oblong lock structure  708  comprises two rib members  708   a ,  708   b , joined at their distal ends. The oblong structure  708  is compressible, and is biased into an expanded position ( FIG. 103A ). 
     As exemplified in  FIG. 103A , pegs  710   a ,  710   b  extend outwardly from each rib  708 . In the storage position ( FIG. 103A ), pegs  710  are inserted into openings, located along the first elongate member  438   1  and second elongate member  438   2 . More specifically, a pair of openings  712   a ,  712   b  are formed along the first member  438   1  to receive pegs  710 . A second pair of openings  714   a ,  714   b  are formed along the second member  438   2 , to also receive pegs  710 . In the storage position, openings  712  and  714  are aligned along a common axis. In particular, this allows pegs  710   a ,  710   b  to insert into both openings  712   a ,  714   a  and  712   b ,  714   b , respectively, and to lock relative movement of the first elongate member  438   1  to the second elongate member  438   2 . 
     As exemplified in  FIG. 103B , once the oblong lock  708  is compressed by fork  706 , pegs  710  are displaced, at least, from openings  714  (e.g., formed on the second elongate member  438   2 ). This permits relative movement of first member  438   1  to the second member  438   2 . The first member  438   1  may then extend until openings  712  and  714  are misaligned ( FIG. 103C ). Once openings  712 ,  714  are misaligned, button  702  may be released ( FIG. 103D ), to disengage fork  706  from lock structure  708 , and to allow the oblong structure  708  to re-expand. 
     As exemplified in  FIG. 103E , the first member  438   1  is extended until openings  712 , of the first member  438   1 , re-align with a secondary set of openings  716 , provided on the second member  438   2 . Once openings  712  and  716  align, the oblong structure  708  automatically re-expands to force pegs  710  through secondary openings  716 . Accordingly, this generates a locking engagement between members  438   1 ,  438   2  in the expanded use position ( FIG. 87B ). 
     If it is desired to re-retract the handle assembly  436  ( FIG. 87E ), the button  702  is again depressed to engage fork  706  with oblong structure  708 , and re-compress the oblong structure  708 . This, in turn, displaces pegs  710  from openings  716 , and allows for relative movement of member  438   1  to member  438   2 . The elongate member  438  can then be retracted into the storage position. 
     It will be appreciated that while two pegs  710  have been exemplified, the oblong member  708  may include any number of pegs, and the elongate members  438  may include any number of corresponding openings ( 712 ,  714  and  716 ) to receive pegs  710 . 
     Optionally, a biasing mechanism is provided to bias the activation mechanism  702  (e.g., button  702 ) in the un-depressed state (e.g.,  FIGS. 103A, 103D-103E ). As exemplified, the biasing mechanism can comprise a biasing spring  718 . The spring  718  is provided inside of a chamber  720 , located within the first member  438   1  (e.g., proximal the first end  438   a  of the elongate member  438 ). An interior wall  722 , of chamber  720 , includes an opening  724  to accommodate rod  704 . As exemplified, spring  718  is biased in the expanded position ( FIG. 103A ). In this configuration, an axial force is required to depress the button  702 , and compress the spring  718 . Once the button  702  is depressed and then released, the spring  718  automatically expands to push the button  702  axially upwardly into the initial un-depressed position. In this manner, a user is not required to manually extract the button after the button has been depressed inwardly. 
     It will be appreciated that other telescoping locking systems may be used which do not require the use of a button  702 . Any telescoping locking system known in the art may be used. 
       FIGS. 161A-161D  exemplify for the use of a telescoping driving assembly  436  for moving a shroud. In the exemplified embodiment, the driving assembly  436  comprises a telescoping elongate member  438 . The elongate member  438  is re-configurable between a retracted storage position ( FIG. 161B ) and an expanded use position ( FIG. 161C ). In particular, as exemplified, in the storage position, a second elongate member  438   2  is nested within a first elongate member  438   1 . A portion of the first elongate member  438   1  extends outside the cyclone chamber  176 . The second end  438   b   2 , of the second elongate member  438   2 , is attached to shroud  212 . As exemplified in  FIG. 161C , the first member  438   1  may telescope, axially outwardly (e.g., along translation axis  232 ) into a use position. Optionally, a lock structure  708  is provided to limit the axial extension of the first member  438   1  relative to the second member  438   2 . The lock structure  708  may operate similar to the oblong structure  708  exemplified in  FIG. 103 . As exemplified in  FIG. 161D , in the expanded position, the elongate member  438  can be used to translate shroud  212  into a cleaned position. 
     As exemplified in  FIGS. 157-160  a re-configurable handle assembly  436  which uses a flexible Bowden cable. As previously discussed, the driving assembly  436  comprises a flexible (or partially flexible material) elongate member  438 . As exemplified, the handle assembly  436  may bend between a storage position ( FIGS. 157 and 159 ), where the elongate member  438  is positioned adjacent the cyclone sidewall  236 , and an expanded use position ( FIGS. 158 and 160 ). In the storage position, the air treatment member  116  can be stowed away in small or tight compartments. In some cases, the member can be biased to the extended use position. 
       FIGS. 162-163  exemplify a further embodiment for a re-configurable handle assembly  436  wherein the handle  440  is translatable. In the exemplified embodiment, the driving assembly  436  comprises a handle  440 , drivingly engaged to a moveable shroud  212 , through an axial gap  444 . The axial gap  444  comprises a first lateral portion  692   a , proximal the first gap end  444   a , and a second laterally extending portion  692   b , proximal the second gap end  444   b . The first and second lateral portions  692  are separate, for example, by a portion of the cyclone sidewall  236 . 
     In the storage position, the handle  440  is disposed inside the first lateral gap  692   a  ( FIG. 162A ). The handle  440  is translated into a “use” position by laterally or radially translating the handle  440 , out of the lateral gap  692   a , and into the axial gap  444  ( FIG. 163A ). In various cases, this can also cause the shroud  212  to rotate inside the chamber  176  (i.e., as the handle  440  is translated laterally). Optionally, as exemplified in  FIG. 163D , once the shroud  212  is in the cleaned position, the handle  440  can again be translated into the second lateral gap  692   b , to retain the shroud  212  in the cleaned position. It will be appreciated that only one lateral gap  692   a , lateral gap  692   b , may be provided. 
     In other embodiments, rather than being drivingly engaged to shroud  212 , the handle  440  can be drivingly engaged to a cleaning member  420 , or the combination of a cleaning member  420  and an attached shroud  212 . 
     In a further optional embodiment, the handle  440  may be rotatable to a storage position. For example, as discussed in more detail subsequently, rod  438  shown in  FIGS. 87A-87E  may be rotatable about is longitudinal axis so as to enable handle  440  to be rotated between an in use and a storage position (see for example  FIG. 94B ). In the storage position, the handle  440  may be positioned adjacent a portion, e.g., of the cyclone assembly and, optionally may be prevented from moving axially by seating on resting member  504 . The handle may be rotated away from the storage position to an in use position (see  FIG. 95B ) in which the handle is no longer seated on resting member  504  and is axially moveable. 
     Handle Assembly Extending Along a Portion of Air Treatment Member 
     Optionally, the driving assembly  436  can extend along (adjacent) a portion of the air treatment member  116 . An advantage of this configuration is that the driving assembly  436  does not need to be re-configured from an in-use position to a storage position in-order to stow away the air treatment member  116  for storage. Further, this configuration can also prevent damage to the handle assembly  436  during storage or use, as the driving assembly  436  is protected by a portion of the treatment member  116 . 
       FIGS. 89A-89B  exemplify a first configuration for a driving assembly  436  which extends along a portion of the air treatment member  116 . As exemplified, the air treatment member  116  comprises a first cyclonic stage  168   1  positioned over a second cyclonic stage  168   2 . The driving assembly  436  comprises an elongate member  438  drivingly engaged to a cleaning member  420  and/or shroud  212  inside the second cyclonic stage  168   2 . As exemplified, the elongate member  438  extends parallel to each of the first and second cyclonic stage  168  (e.g., the rod  438  is co-extensive with the cyclonic stages). Accordingly, in this configuration, the elongate member  438  can translate the cleaning member  420  and/or shroud  212  between the storage position ( FIG. 89A ) and one or more cleaned positions ( FIG. 89B ), without deployment (e.g., re-configuring the elongate member  438  from a storage position to an extended use position). 
       FIG. 111  exemplifies another configuration for a handle assembly  436  which extends along a portion of the air treatment member  116 . In the exemplified configuration, the driving assembly  436  comprises an elongate member  438 , and the elongate member  438  extends parallel to, and is co-extensive with, the external dirt chamber  172 . In the exemplified embodiment, the external dirt chamber  172  has an axial length which is greater than the cyclone chamber  176 . Optionally, as exemplified, the external chamber  172  has an axial length which is substantially equal to the axial length of the elongate rod  438 , when the rod  438  is configured in the storage position. 
     In various cases, as exemplified in  FIG. 94 , where the driving assembly  436  extends along a portion of the air treatment member  116 , a handle  440  of the driving assembly  436  may be configurable to move (e.g., rotate) between a storage position (e.g.,  FIG. 94 ) and an in-use position (e.g.,  FIG. 95 ), about translation axis  428 . In the storage position, the handle  440  is recessed toward the cyclone unit  170 . Optionally, a resting member  504  is located on a track  430  to receive (e.g., rest) the handle  440  in the storage position. Preferably, the resting member  504  is positioned such that when the handle  440  is rested thereon, the cleaning member  420  is also positioned in the storage position (e.g., proximal the first cyclone end). The resting member may protect the handle from being accidentally actuated while the surface cleaning apparatus is in use. The handle may accordingly be moved outwardly into an in-use position (e.g.,  FIG. 95 ), whereby the handle  440  is usable to axially move the handle assembly. In various cases, where the handle assembly  436  comprises an elongate member  438  which travels through a track  430 , an axial gap may extend axially along the track  430  to accommodate axial movement of the handle  430  (e.g., axial gap  447  in  FIG. 118D ). 
     While the exemplified embodiments have illustrated the driving assembly  436  is extending along one or more cyclonic stages, or an external dirt chamber, it will be appreciated that, in other embodiments, the driving assembly  436  may extend along, and be co-extensive with, any other portion of the air treatment member  116  or a surface cleaning apparatus. For example, in other cases, the driving assembly  436  may be co-extensive with the suction motor housing  164 . 
     Alternative Cleaning Mechanisms 
       FIGS. 164-166  exemplify other embodiments for cleaning, at least, the shroud  212 . In these embodiments, the shroud is remove via the outlet end of the cyclone chamber to enable the shroud to be cleaned. 
     As exemplified, shroud  212  is attached (e.g., integrally or detachably) to a lid  562 . As exemplified, lid  562  can surround the axial outer end  212   b  of the shroud  212 . The lid  562  is located axially above the first cyclone end  240  (e.g., assuming the cyclone  170  is in an upright position), which the air outlet end of the cyclone chamber. As exemplified, in this configuration, the lid  560  can be used to pull the shroud  212  from a storage or use position ( FIGS. 164B, 165A and 166B ), in which the shroud  212  is located inside the cyclone chamber, to a cleaned position ( FIGS. 164C, 165B and 166C ), in which the shroud  212  is disposed outside the cyclone chamber  176 . 
     Optionally, as exemplified in  FIG. 166 , a handle  440  can be attached (e.g., integrally molded or detachably connected) to lid  562 , to facilitate pulling the shroud  212  out of the cyclone chamber. Optionally, an elongate member  438  may depend from the handle  440 , and can be receivable inside an external track  430 , located adjacent the cyclone  170 . In various cases, insertion of the elongate member  438  inside the track  430  can help secure the shroud  212  inside the cyclone  170  in the storage or use position. 
     Optionally, as exemplified in  FIGS. 164-165 , a biasing mechanism can be provided to bias the shroud  212  into the cleaned position. In the exemplified embodiment, the biasing mechanism comprises a spring  682 , which is biased in an expanded state (e.g., a compression spring). As exemplified, the lid  562  may be spaced from the first cyclone end  240 , and a sidewall  563  may depend axially from the lid  562 , and extend to the first cyclone end  240  when the lid  562  is in the closed position. The biasing spring  682  may be provided between the lid  562  and the first cyclone end  240 . As exemplified, a latch  674  can secure the lid  562  in the closed position ( FIGS. 164B and 165A ), and hold the spring  682  in the compressed position. Latch  674  may be rotatably secured to the cyclone sidewall  236  by a hinge  814 . When the latch  674  is rotated away (e.g., about pivot axis  814   a ), the spring  682  may automatically expand to push the shroud  212  into the cleaned position ( FIGS. 164C and 165B ). 
     Door Lock Mechanism 
     Optionally, in any of the embodiments discussed herein, a door locking mechanism may be provided to lock or unlock a bottom openable door  352  of the cyclone  170 . The door lock may secure the door  352  in the closed position during storage or use of the air treatment member  116 . The door lock may also be unlocked to enable a door (e.g., an end wall of the cyclone) to open to thereby permit the dirt collection chamber  172  and/or cyclone chamber  176  to be emptied, as well as to provide access to the cleaning member  420  and/or shroud  212 . The door locking mechanism may be actuated (e.g., moved to the unlocked position) by movement of the handle  440  or the driving assembly to a cleaned position. 
       FIGS. 121-122  exemplify an embodiment of a door locking mechanism  486  which is positioned axially spaced from and aligned with a driving rod  438  that forms part of the driving assembly so as to be engageable by the driving rod  438 . As exemplified, the driving rod  438  may depend axially from the handle  440 . 
     As exemplified, the locking mechanism  486  comprises a first lock member  530  and a second lock member  534 . As best exemplified in  FIG. 122A , each lock member includes a respective first end  530   a ,  534   b  and a respective opposed second end  530   b ,  534   b.    
     Optionally, the first end  530   a , of the first lock member  530 , can comprise a concave surface (e.g., a cup shaped surface). The concave surface engages the second end  438   b  of the elongate member  438  when the elongate member  438  is translated axially downwardly toward the second cyclone end  244  (e.g., assuming the cyclone is in an upright position). 
     As exemplified, the second end  530   b , of the first lock member  530 , is pivotally joined to the second lock member  534  (e.g., the first end  534   a  of the second lock member  534 ). In the exemplified embodiment, the first lock member  530  is configured as a “V” shaped member, which pivots about pivot point  536 . 
     The second end  534   b , of the second lock member  534 , is slidably received inside of slot  542 , disposed on a first depending portion  540  of door  352 . Second end  534   b  is also slidably received inside slot  538 , disposed on a second depending portion  236   a  of cyclone sidewall  236 . 
     In the locked position ( FIG. 122A ), slots  538 ,  542  are substantially axially aligned, and the second lock member  534  extends through each slot  538 ,  542 . In this configuration, the second lock member  534  prevents opening of door  352 . 
     When it is desired to open door  352 , the second end  438   b , of the elongate member  438 , engages (i.e., applies an axial downward force) to the cup-shaped end  530   a , of the first lock member  530 . This, in turn, pivots the first lock member  530  about pivot point  536 . As the first lock member  530  pivots, it urges the second lock member  534  upwardly (e.g., through a pivotal connection). In particular, as the second lock member  534  is urged axially upwardly, second lock member  534  is slidably removed (e.g., radially inwardly) from slot  538  (on cyclone sidewall  236   a ), and unlocks door  352 . In this manner, the door  352  is able to rotate into the open position ( FIG. 122B ). 
       FIGS. 123-124  exemplify another embodiment for a door locking mechanism  486  which is also engagable by a driving rod  438  that forms part of the driving assembly. 
     In the exemplified embodiment, the cyclone  170  comprises an openable first sidewall portion  248 . As exemplified, the unlocking mechanism  486  comprises a flexible member  612 , which depends from the first sidewall portion  248 . The flexible member  612  comprises a first end  612   a  and a second end  612   b , wherein the second end  612   b  is disposed axially above the first end  612   a  (e.g., assuming the air treatment member  116  is in the upright position). In the exemplified embodiment, the first end  612   a  is attached (e.g., integrally molded) to the first sidewall portion  248 . The second end  612   b  comprises a hook-shaped formation, formed from a first lateral surface  614 , and a second slanted lateral surface  616 , wherein the second lateral surface  616  is located axially above the first surface  614 . 
     In the locked position ( FIGS. 123B and 124B ), the first lateral surface  614  rests on a flange  618  (e.g., rib or peg), which extends outwardly from the second cyclone sidewall portion  252 . Accordingly, sidewall portion  248  is held in the closed position by engagement of the lateral surface  614  on the flange  618 . 
     To unlock the lock mechanism  486 , the second end  438   b , of the elongate member  438 , is translated toward the second cyclone end  244 , and applies an axial downward force to the slanted surface  616 . This, in turn, compresses (i.e., forces downwardly) the slanted surface  616 , and causes the lateral surface  614  to displace from the flange  618 . Accordingly, this allows the first sidewall portion  248  to rotate with respect to the second sidewall portion  252 . The elongate rod  438  may unlock the locking mechanism  486 , and further push the sidewall portion  248  into the open position by continuing to applying an axial force to the slanted surface  616 . 
     While the lock mechanism  486  in  FIGS. 123-124  has been exemplified with respect to a sidewall  236  having an openable sidewall portion, it will be appreciated that the same lock configuration can be applied to secure, e.g., a bottom openable door  352  in the closed position. For example, the first end  612   a  of the flexible member  612  may be attached (e.g., integrally molded) to a portion of door  352 , and the flange  618  may extend from the cyclone sidewall  236 . 
     In other embodiments, the driving rod  328  may not actuate a door locking mechanism  486 , but rather, may simply push the bottom door  352  into the open position. For instance, as exemplified in  FIGS. 93A-93C , the door  352  may extend to at least partially underlie the driving rod  438  (or track  430 ). In this configuration, the driving rod  438  is translated toward the second cyclone end  244 , and the second end  438   b , of the elongate rod  438 , engages the door  352 , and pushes the door  352  into the open position. Such a design may be used, e.g., with a manually openable door. 
       FIGS. 106-108  exemplify still another configuration for a door locking mechanism  486  in which the cleaning member  420  and/or the screen  212  may be used for unlocking the openable door  352 . 
     In the exemplified embodiment, and as best exemplified in  FIG. 107 , the openable door  352  is retained in the closed position by a lock member  498 . The lock member  498  includes a first end  498   a  and an axially opposed second end  498   b . The second end  498   b  holds the door in the locked position by extending through opening  542  on depending portion  540 , and opening  538 , on depending sidewall portion  236   a.    
     As exemplified, a peg  806  is disposed on a lower surface (e.g., face), of the cleaning member  420 , which faces the second cyclone end  244 . As exemplified in  FIG. 107A , upon translating cleaning member  240  toward the second cyclone end  244 , peg  806  is receivable inside of a small opening  808 , formed through the second cyclone end  244 , and engages an optional flexible seal member  488 . Upon engagement, the peg  806  deforms the seal member  488 , and causes the seal member  488  to engage an activation mechanism  492 . In the exemplified embodiment, the activation mechanism  492  comprises an electronic sensor (e.g., a pressure sensor), which is activated when engaged by the flexible seal  488 . Once activated, the electrical sensor  492  transmits an electrical signal, via wire  496 , to a motor unit  494 . The activated motor unit  494  pulls (e.g., draws) the locking member  498  out of the opening  538 , to unlock the door  352 . When it is desired to re-lock the door  352 , the locking member  498  may be, for example, manually re-inserted into openings  538 ,  542  while the door  352  is in the closed position. It will be appreciated that peg  806  may alternately mechanically engage and actuate the locking mechanism. 
       FIG. 108  exemplifies a similar configuration where door  352  is unlocked by screen  212 . In the exemplified configuration, the cleaning member  420  and screen  212  are translated concurrently through the cyclone chamber  176 . As exemplified, the screen  212  includes a peg  806 , disposed on an axial inward surface  212   a  of the screen  212 . When the screen  212  is translated to the second cyclone end  244 , peg  806  extends through the opening  808 , and activates the activation mechanism  492  to unlock door  352 . In other cases, peg  806  may be provided at different locations along the screen  212 . For example, peg  806  may be located (or formed) on cleaning prongs  462 , which axially depend from screen  212  ( FIG. 90C ). In these cases, the prongs  462  can have a greater axial length than shroud  212  to engage the locking mechanism before shroud  212  engages the second cyclone end  244 . 
     It will be appreciated that the configuration exemplified in  FIG. 108  can also be used where a cleaning member  420  is not provided, and the cyclone comprises only a moveable shroud  212 . It will also be appreciated that, in other embodiments, the driving rod  438  can extend beyond the cleaning member  420  and/or shroud  212 , and the peg  806  can be disposed at an axially inward end  438   b  of the driving rod  438 . For example, the cleaning member  420  and/or shroud  212  may attach to a mid-portion of the driving rod, rather than to the second end  438   b  (as exemplified), such that the driving rod  438  can extend beyond the cleaning member  420  and/or shroud  212 . In particular, in this configuration, the driving rod  438  can be used to unlock the lock mechanism  436  from inside the cyclone chamber  176 . 
       FIG. 164  exemplifies another embodiment for a door locking mechanism wherein the actuator is not part of the handle  440  or the driving mechanism. 
     As exemplified in  FIG. 164 , a first latch  672  is provided to secure the door  352  in the closed position. In the exemplified embodiment, latch  672  is rotatably secured to the cyclone sidewall  236 , proximal the second cyclone end  244 , by hinge  812 . As exemplified in  FIG. 164B , latch  672  includes a slot  672   a , which receives a flange  816  extending from door  352 . A second latch  674  is also provided, proximal the first cyclone end  240 , and is used to secure the lid  562 . The first and second latches  672 ,  674  are connected to each other by a retraction rod  684 . 
     As exemplified in  FIG. 164C , when the second latch  674  is rotated away from the cyclone  170  to release lid  562 , the retraction rod  684  causes the first latch  672  to also rotate away, along rotation axis  812   a . In this manner, the door  352  is opened concurrently with release of the top lid  562 . 
     It will be appreciated that while the exemplified locking mechanisms have been illustrated with respect to an openable door  352 , provided at the second cyclone end  244 , similar locking mechanisms can be used to lock a top openable door  390 , provided at the first cyclone end  240  (e.g., in cases where the cyclone  170  is an inverted cyclone). 
     It will also be appreciated that any locking mechanism known in the vacuum cleaner arts may be used and that the locking mechanism may be directly engagable and actuatable by the handle  440  itself, the driving mechanism, the cleaning member and/or the shroud. 
     While the above description provides examples of the embodiments, it will be appreciated that some features and/or functions of the described embodiments are susceptible to modification without departing from the spirit and principles of operation of the described embodiments. Accordingly, what has been described above has been intended to be illustrative of the invention and non-limiting and it will be understood by persons skilled in the art that other variants and modifications may be made without departing from the scope of the invention as defined in the claims appended hereto. The scope of the claims should not be limited by the preferred embodiments and examples, but should be given the broadest interpretation consistent with the description as a whole.