Patent Publication Number: US-2021177222-A1

Title: Vacuum cleaner having flexible vent members

Description:
BACKGROUND 
     Field of the Invention 
     This invention generally relates to a vacuum cleaner. More specifically, the present invention relates to a vacuum cleaner having flexible vent members. 
     Background Information 
     Vacuum cleaners typically use a suction nozzle that is movable across a surface to be cleaned. The suction created at an inlet in the nozzle results in the removal of free dirt particles accumulated on the surface. However, ground-in dirt is frequently encountered when cleaning carpets or other textured surfaces, and reliance on suction for removal of such ground-in dirt has proven to be unsatisfactory. 
     Vacuum cleaners are provided with devices that agitate the carpet surface to dislodge ingrained dirt particles. For example, mechanical beaters physically strike the carpet surface to loosen dirt particles. Such agitators are often located on the vacuum cleaner nozzle head, so that dirt can be dislodged and instantly removed by moving the nozzle head across a soiled carpet surface. An example of a mechanical beater is a cylindrical rotatable beater brush having a plurality of extending resilient bristles and prongs that physically beat the carpet as the nozzle head is moved. 
     A recent trend in carpet manufacturing is soft carpets, which are made of softer yarns. Denier quantifies the softness of the yarn, and is the weight in grams of 9,000 meters of the yarn. The larger the denier, the thicker the yarn. Denier per filament (DPF) represents the size of an individual filament of the yarn. The lower the DPF, the softer the fiber. Traditional home carpets have a DPF of between approximately 12 to 18 DPF. The new soft carpet trend has resulted in carpets having a DPF between approximately 3.5 to 4.5 DPF. These soft yarns can have three to four times as many filaments as in the traditional home carpets. Traditional strands of yarn have approximately 120 filaments. The soft strands of yarn can have approximately 700 or more filaments. 
     SUMMARY 
     Generally, the present disclosure is directed to various features of a vacuum cleaner in one feature, a vacuum cleaner is provided having; flexible vent members. 
     In view of the state of the know technology and in accordance with a first aspect of the present disclosure, a vacuum cleaner is basically provided with a base, a motor, first and second inlets, and first and second flexible members. The motor is configured to create flow through a suction path. The first inlet and the second inlet are disposed in the base in fluid communication with the suction path. The first flexible member and the second flexible member are connected to the base to cover the second inlet. The first and second flexible members are movable between first positions in which the second inlet is substantially covered to substantially prevent fluid from flowing through the second inlet and second positions in which fluid is allowed to flow through the second inlet. 
     In accordance with a second aspect of the present invention, the vacuum cleaner according to the first aspect is configured such that each of the first and second flexible members has a fixed end and a free end, and the free ends of the first and second flexible members contacting each other in the first positions. 
     In accordance with a third aspect of the present invention, the vacuum cleaner according to the second aspect is configured such that the first and second flexible members are movable to the second positions upon a suction force being exerted on the first and second flexible members causing movement thereof. 
     In accordance with a fourth aspect of the present invention, the vacuum cleaner according to the first aspect is configured such that the first and second flexible members are made of a material selected from the group consisting of silicone, rubber, neoprene and polyurethane. 
     In accordance with a fifth aspect of the present invention, the vacuum cleaner according to the first aspect is configured such that each of the first and second flexible members has a Shore A durometer between approximately 10 and approximately 90. 
     In accordance with a sixth aspect of the present invention, the vacuum cleaner according to the first aspect is configured such that the first and second flexible members are substantially identical. 
     In accordance with a seventh aspect of the present invention, the vacuum cleaner according to the first aspect is configured such that a third inlet is disposed in the base in fluid communication with the suction path, and a third flexible member and a fourth flexible member are connected to the base to cover the third inlet, the third and fourth flexible members being movable between first positions in which the third inlet is substantially covered to substantially prevent fluid from flowing through the third inlet and second positions in which fluid is allowed to flow through the third inlet. 
     In accordance with an eighth aspect of the present invention, the vacuum cleaner according to the seventh aspect is configured such that the first, second, third and fourth flexible members are substantially identical. 
     In accordance with a ninth aspect of the present invention, the vacuum cleaner according to the second aspect is configured such that a surface agitator is rotatably disposed in the base. 
     In accordance with a tenth aspect of the present invention, the vacuum cleaner according to the ninth aspect is configured such that the first and second flexible members are disposed forward of the surface agitator in a longitudinal direction of the base. 
     In view of the state of the known technology and in accordance with an eleventh aspect of the present disclosure, a vacuum cleaner is basically provided with a housing, a suction path, a base, a motor, first and second inlets, and first and second flexible members. The suction path is in fluid communication with the housing. The motor is configured to create flow through the suction path. The first inlet and the second inlet are disposed in the base in fluid communication with the suction path. The second inlet is disposed forward of the first inlet in a longitudinal direction of the base. The first flexible member and the second flexible member are connected to the base to cover the second inlet. The first and second flexible members are movable between first positions in which the second inlet is substantially covered to substantially prevent fluid from flowing through the second inlet and second positions in which fluid is allowed to flow through the second inlet. 
     In accordance with a twelfth aspect of the present invention, the vacuum cleaner according to the eleventh aspect is configured such that the first and second flexible members are movable to the second positions upon a suction force being exerted on the first and second flexible members causing movement thereof. 
     In accordance with a thirteenth aspect of the present invention, the vacuum cleaner according to the eleventh aspect is configured such that the base includes a frame and a cover plate connected to the frame, the second inlet being defined between the cover plate and the frame. 
     In accordance with a fourteenth aspect of the invention, the vacuum cleaner according to the thirteenth aspect is configured such that no portion of the frame is disposed directly beneath the second inlet. 
     In accordance with a fifteenth aspect of the invention, the vacuum cleaner according to the thirteenth aspect is configured such that the first flexible member is connected to the frame, and the second flexible member is connected to the cover plate. 
     In accordance with a sixteenth aspect of the invention, the vacuum cleaner according to the eleventh aspect is configured such that each of the first and second flexible members has a fixed end and a free end, the free ends of the first and second flexible members contacting each other in the first positions. 
     In accordance with a seventeenth aspect of the present invention, the vacuum cleaner according to the eleventh aspect is configured such that the first and second flexible members are made of a material selected from the group consisting of silicone, rubber, neoprene and polyurethane. 
     In accordance with an eighteenth aspect of the present invention, the vacuum cleaner according to the eleventh aspect is configured such that each of the first and second flexible members has a Shore A durometer between approximately 10 and approximately 90. 
     In accordance with a nineteenth aspect of the present invention, the vacuum cleaner according to the eleventh aspect is configured such that the first flexible member is configured to pivot in a first pivot direction and the second flexible member is configured to pivot in a second pivot direction, the second pivot direction being opposite the first pivot direction. 
     In accordance with a twentieth aspect of the present invention, the vacuum cleaner according to the eleventh aspect is configured such that the first flexible member contacts the second flexible member when the first and second flexible members are in the first positions. 
     Also, other objects, features, aspects and advantages of the disclosed vacuum cleaner will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses exemplary embodiments of the vacuum cleaner. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Referring now to the attached drawings which form a part of this original disclosure: 
         FIG. 1  is a perspective view of a vacuum cleaner in accordance with an exemplary embodiment of the present invention; 
         FIG. 2  is a perspective view of a base of the vacuum cleaner of  FIG. 1  with first and second flexible members in a closed position; 
         FIG. 3  is a side elevational view in cross section of the base of the vacuum cleaner of  FIG. 2 ; 
         FIG. 4  is a perspective view of the base of the vacuum cleaner of  FIG. 1  with the first and second flexible members in a partially opened position; 
         FIG. 5  is a side elevational view in cross section of the base of the vacuum cleaner of  FIG. 4 ; 
         FIG. 6  is a perspective view of the base of the vacuum cleaner of  FIG. 1  with the flexible members in a fully opened position; 
         FIG. 7  is a side elevational view in cross section of the base of the vacuum cleaner of  FIG. 6 ; 
         FIG. 8  is a lower perspective view of the base of the vacuum cleaner of  FIG. 1 ; and 
         FIG. 9  is an exploded assembly view of the base of the vacuum cleaner of  FIG. 1 . 
     
    
    
     Throughout the drawing figures, like reference numerals will be understood to refer to like parts, components and structures. 
     DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     Selected exemplary embodiments will now be explained with reference to the drawings. It will be apparent to those skilled in the art from this disclosure that the following descriptions of the exemplary embodiments are provided for illustration only and not for the purpose of limiting the invention as defined by the appended claims and their equivalents. 
     As shown in  FIG. 1 , a vacuum cleaner  10  in accordance with an exemplary embodiment of the present invention includes a suction head or base  12 , a housing  14  for receiving debris, a handle  16 , and a power cord  18  for connecting the vacuum cleaner  10  to a source of electrical power. The housing  14  can be, for example, a bag housing or any other suitable apparatus for receiving dirt, dust and other debris collected during operation of the vacuum cleaner  10 . The vacuum cleaner  10  can be any suitable type of vacuum cleaner, such as, but not limited to, a direct air and bypass air upright vacuum cleaner, a canister vacuum cleaner, a stick vacuum cleaner, and a multi-surface vacuum cleaner. The various components and interactions of the vacuum cleaner  10  would be understood by one of ordinary skill in the art. 
     The base  12  includes a top surface  20  and a lower surface  22 . The top surface  20  includes a front portion  24 , which may be curved as best shown in the exemplary embodiment of  FIGS. 1 to 9 . A set of front wheels  26  and a set of rear wheels  28  are rotatably connected to the base  12 . The front wheels  26  are rotatable about a first rotation axis R 1  and the rear wheels  28  are rotatable about a second rotation axis R 2 , as shown in  FIG. 3 . The first and second rotation axes R 1  and R 2  extend in a lateral (left-to-right) direction of the vacuum cleaner  10 . The first and second rotation axes R 1  and R 2  are substantially parallel to one another. The first and second rotation axes R 1  and R 2  extend substantially perpendicularly to a longitudinal (front-to-back) direction of the vacuum cleaner  10 . The front and rear wheels  26  and  28  facilitate pushing and pulling the vacuum cleaner  10  during operation. In an exemplary embodiment, as shown in  FIG. 8 , the front wheels  26  have an increased width and the rear wheels  28  have an increased diameter, respective to each other, to help reduce friction and to allow the vacuum cleaner  10  to be used with a variety of carpet types. 
     The base  12  includes a frame  31  and a cover plate  30  connected to the frame  31 . The cover plate  30  is connected to a lower surface of the frame  31 , as shown in  FIGS. 1-9 . The cover plate  30  has a plurality of fastener openings  34  to receive fasteners connecting the cover plate  30  to the frame  12 . The front wheels  26  can be connected to the cover plate  30 , as shown in  FIG. 8 , or directly to the frame  12 . As shown in  FIG. 8 , the cover plate  30  preferably includes bearing housings  36  for receiving the front wheels  26 . 
     A surface agitator, such as a brush roll  32 , is connected to the lower surface  22  of the frame  31 , as shown in  FIGS. 8 and 9 . The surface agitator, such as the brush roll  32 , is movably disposed in the base  12 . In an exemplary embodiment, the cover plate  30  secures the brush roll  32  to the base  12 . The cover plate  30  also includes an opening  38  for receiving the brush roll  32 . A plurality of support members  40  extend across the opening  38  to facilitate supporting the brush roll  32 . The support members  40  preferably extend in a direction parallel to a longitudinal, or front-to-rear, direction of the vacuum cleaner. The brush roll  32  is a rotating cylinder  42  having a helical bristle  44  extending from the cylinder. Different types of brush rolls  32  or other carpet agitators may be used in place of, or in addition to, the cover plate  30 . 
     As best shown in  FIG. 5 , the opening  38  in the cover plate  30  acts as a first inlet, or suction, inlet  46 . Depending on the cover plate  30 , the base  12 , and the intended use of the vacuum cleaner  10 , more air flow inlets may also be provided, including various apertures or slots. 
     The vacuum cleaner  10  includes a second inlet, or vent,  48 . The second inlet  48  acts as a second air inlet in addition to the air inlet provided in the first inlet  46 . The second inlet  48  is positioned in the base  12 , as shown in  FIGS. 1-9 . As shown in  FIGS. 3, 5 and 7 , the second inlet  48  is preferably substantially perpendicular to the first inlet  46 . As shown in  FIG. 9 , the second inlet  48  is preferably defined between the cover plate  30  and the frame  31 . A recess  33  is formed in the cover plate  30 , as shown in  FIG. 9 . The second inlet  48  is preferably defined by the recess  33  and the lower surface of the frame  31 . As shown in  FIGS. 3 and 9 , for example, no portion of the frame  31  is disposed directly below the second inlet  48 . 
     First and second flexible vent members, or flexible members,  50  and  51  are movably disposed in the second inlet  48 , as shown in  FIGS. 3, 5 and 7 , to control the flow of fluid through the second inlet  48 . The first and second flexible vent members  50  and  51  are fixedly connected to the base  12 , as shown in  FIG. 9 . The first and second flexible vent members  50  and  51  have fixed ends  52  and  53 , respectively, connected to the base  12  and free ends  54  and  55  disposed outwardly from the fixed ends  52  and  53 . The free ends  54  and  55  of the first and second flexible vent members  50  and  51  contact each oilier when the first and second flexible members  50  and  51  are in the first, or closed, positions, as shown in  FIG. 3 . 
     The first and second flexible vent members  50  are  51  are movable between the first, or closed, positions, as shown in  FIGS. 2 and 3 , and a second, or opened, positions, as shown in  FIGS. 4-7 .  FIGS. 6 and 7  illustrate the first and second flexible members  50  and  51  in fully opened positions.  FIGS. 4 and 5  illustrate the first and second flexible vent members  50  and  51  in partially opened positions between the closed positions of  FIGS. 2 and 3  and the fully opened positions of  FIGS. 6 and 7 . 
     The fixed end  52  of the first flexible vent member  50  is fixedly connected to the lower surface of the frame  31  of the base  12 , as shown in  FIGS. 3 and 9 . The fixed end  53  of the second flexible vent member  51  is fixedly connected to the recess  33  of the cover plate  30 . The fixed ends  52  and  53  of the first and second flexible vent members  50  and  51  are connected to the base  12  in any suitable manner, such as with a fastener or adhesive. Alternatively, the flexible vent members  50  and  51  can be slid into a slot or other suitable receiving member in the frame  12  and the cover plate  30 , such that the flexible vent members  50  can be easily installed and replaced. The first flexible vent member  50  extends toward the second flexible member  51  in the first position, as shown in  FIG. 3 . As shown in  FIGS. 3 and 9 , the free ends  54  and  55  contact each other when the first and second flexible vent members  50  and  51  are in the first positions to substantially cover the second inlet  48  to substantially prevent fluid from flowing therethrough. Alternatively, the free end of one of the flexible vent members  50  and  51  can overlap the free end of the other flexible vent member such that the second inlet  48  is closed to prevent fluid from flowing, therethrough. Alternatively, a slight gap can be formed between the free ends  54  and  55  of the first and second flexible vent members  50  and  51 . 
     The first and second flexible members  50  and  51  are preferably substantially rectangular, as shown in  FIG. 9 . The first and second flexible members  50  and  51  can be longer than the second inlet  48 , such that the lateral ends of the first and second flexible members  50  and  51  extend beyond the lateral ends of the second inlet  48 . Alternatively, the lateral ends of the first and second flexible members  50  and  51  contact the lateral ends of the second inlet  48  when the first and second flexible members  50  and  51  are in the closed positions. The first and second flexible members  50  and  51  are preferably substantially identically shaped. 
     The first flexible member  50  is configured to move in a first movement direction M 1  and the second flexible member  51  is configured to move in a second movement direction M 2 , as shown in  FIG. 9 . The second movement direction M 2  is opposite the first movement direction M 1 . As shown in  FIG. 9 , the first flexible member  50  moves in a counter-clockwise direction (M 1 ) about the fixed end  52  from the first position ( FIG. 3 ) to the second position ( FIGS. 5 and 7 ). As shown in  FIG. 9 , the second flexible member  51  moves in a clockwise direction (M 2 ) about the fixed end  53  from the first position ( FIG. 3 ) to the second position ( FIGS. 5 and 7 ). The second movement direction M 2  is preferably opposite the first movement direction M 1 . 
     When the first and second flexible members  50  and  51  are in the first position, as shown in  FIGS. 2 and 3 , the second inlet  48  is substantially covered to substantially prevent fluid from flowing through the second inlet  48 . The first position corresponds to the first and second flexible members  50  and  51  being in the fully closed position. 
     When the first and second flexible members  50  and  51  are in the second positions, as shown in  FIGS. 4 to 7 , fluid is allowed to flow through the second inlet  48 . The second position corresponds to a position in which the first and second flexible members  50  and  51  are moved to allow fluid to flow through the second inlet  48 . As shown in  FIGS. 4 and 5 , the first and second flexible members are moved about the fixed ends  52  and  53 , respectively, to partially opened positions. As shown in  FIGS. 6 and 7 , the first and second flexible members  50  and  51  are moved about the fixed ends  52  and  53  to fully opened positions. As shown in  FIGS. 3, 5 and 7 , free ends  54  and  55  of the first and second flexible members  50  and  51  are disposed rearwardly in the second position with respect to the free ends  54  and  55  of the first and second flexible members  50  and  51  in the first position. The first and second flexible members  50  and  51  are positionable in at least one position between the closed positions ( FIGS. 2 and 3 ) and the fully opened positions ( FIGS. 6 and 7 ), such as the partially opened positions shown in  FIGS. 4 and 5 . 
     As best shown in  FIGS. 3, 5 and 7 , the first and second flexible members  50  and  51  are variably positionable to increase the amount of airflow through the second inlet  48 . The first and second flexible members  50  and  51  are movable between closed positions shown in  FIGS. 2 and 3 , fully opened positions shown in  FIGS. 6 and 7 , intermediate positions shown in  FIGS. 4 and 5 , and various other positions therebetween. In an exemplary embodiment, the first and second flexible members  50  and  51  are movable between the first positions in which the first and second flexible members  50  and  51  substantially cover the second inlet  48  to substantially prevent fluid from flowing therethrough and the second positions in which fluid is allowed to flow through the second inlet  48 . The first positions, therefore, do not need to fully close the second inlet  48 . 
     Softer carpets have an increased surface area of the fibers, which increases the drag across a surface with the vacuum cleaner. Additionally, the increased surface area increases the difficulty of pulling air through the carpet, which slows down or stops the mechanical beaters, such as the brush roll  32 , of the vacuum cleaner. Soft yarn strands also lack the stiffness of traditional carpets, such that vacuum cleaners tend to sink in the soft carpets. The soft yarn strands tend to form a more complete seal around the vacuum cleaner base, thereby increasing suction at the point of contact with the soft carpet surface. The more the vacuum cleaner base sinks into the soft carpet, the greater the suction and the difficulty of operating the vacuum cleaner. Being able to automatically adjust the airflow through the second inlet  48  allows a user to compensate for the issues raised with softer carpets, while also allowing the vacuum cleaner to automatically adjust to different types of carpeted surfaces. 
     The first and second flexible members  50  and  51  are positioned in the closed positions, as shown in  FIGS. 2 and 3 . When there is difficulty in drawing air through the first inlet  46 , such as when soft yarn strands seal the first inlet  46  as described above, suction is increased in the second inlet  48 . When the suction exerted on the first and second flexible members  50  and  51  becomes larger than a predetermined value, the first and second flexible members  50  and  51  are movably drawn to the second positions ( FIGS. 4 to 7 ), thereby allowing fluid to flow through the second inlet  48 . The amount of suction exerted on the first and second flexible members  50  and  51  determines the movement amount of the first and second flexible members  50  and  51  such that the greater the suction exerted on the first and second flexible members  50  and  51 , the larger the movement amount of the first and second flexible members  50  and  51 . The relief of suction to the second inlet  48  clears the seal at the first inlet  46  due to the carpet. As suction is returned to the first inlet  46 , the suction at the second inlet  48  is reduced. When the suction at the second inlet  48  becomes less than the predetermined value, the first and second flexible vent members  50  and  51  movably return to the first positions. The hardness of the flexible vent members  50  and  51  can be selected to control the amount of suction required to move the first and second flexible members  50  and  51  during operation of the vacuum cleaner  10 . The hardness of the first and second flexible members  50  and  51  can be selected to be larger such that the first and second flexible members  50  and  51  only move when a blockage occurs at the first inlet  46 , and the first and second flexible vent members  50  and  51  movably return to the fully closed positions when the blockage is cleared. 
     When the first and second flexible vent members  50  and  51  are in the fully closed positions, as shown in  FIG. 3 , such that substantially no fluid flows through the second inlet  48 , the entire fluid flow substantially passes through the first inlet  46  in the lower surface  22  of the base  12 . When the first and second flexible vent members  50  and  51  are automatically moved to the second positions, as shown in  FIGS. 5 and 7 , fluid flow is generated through the second inlet  48 , thereby relieving suction through the first inlet  46 . By relieving the suction through the first inlet  46 , the vacuum cleaner  10  becomes easier to push and pull such that the mobility of the vacuum cleaner will be easier for the user. Additionally, slowing down or stopping the brush roll  32  is relieved or eliminated. The additional air path through the second inlet  48  prevents the soft carpet strands from forming a complete seal with the first inlet  46  that can stop operation of the vacuum cleaner  10 . By drawing air in through both the first inlet  46  and the second inlet  48 , the vacuum cleaner  10  continuously operates when cleaning soft carpets. The second inlet  48  is preferably disposed above the free ends of the carpet strands of the carpet being cleaned, such that the carpet strands do not interfere with the airflow through the second inlet  48 . 
     As best shown in  FIGS. 3, 5 and 7 , the second inlet  48  directs airflow to the base  12 , for example, a bottom region of the base  12  proximate the brush roll  32 , for example, in front of the brush roll  32  and the first inlet  46 . The second inlet  48  is positioned to receive air from in front of the of the base  12 , for example, approximately perpendicular to the longitudinal axis of the brush roll  32  or approximately perpendicular to the airflow of the first inlet  46  or substantially perpendicular to a mean vector of the airflow through the first inlet  46 . Depending on the cover plate  30  and the brush roll  32 , the flow of fluid through the second inlet  48  may be substantially perpendicular to the airflow through the first inlet  46 , as shown in  FIGS. 5 and 7 . In alternative embodiments, the second inlet  48  can be positioned to provide airflow at other locations of the base  12  or a suction path  78 . The second inlet  48  is positioned in the base  12  as close to the surface to be cleaned as possible. This allows for less venting, achieving sufficient suction to perform a cleaning operation on a carpet while still permitting mobility in softer carpets. For example, the second inlet  48  is positioned in the base  12 , adjacent the lower surface  22 , or positioned in the cover plate  30  positioned below the lower surface  22 . In an exemplary embodiment the second inlet  48  is positioned approximately within five inches of a surface to be cleaned. In another exemplary embodiment, the second inlet  48  is positioned approximately within one inch of a surface to be cleaned. As shown in  FIGS. 3, 5 and 7 , the second inlet  48  is disposed below an uppermost part of the surface agitator, such as the brush roll  32 . The second inlet  48  is preferably disposed in front of the surface agitator, such as the brush roll  32 , in a lengthwise direction of the base  12  of the vacuum cleaner  10 . 
     A suction motor  80  is disposed in the base  12  of the vacuum cleaner  10 , as shown in  FIGS. 3, 5 and 7 . Alternatively, the suction motor  80  can be disposed elsewhere, for example in the body of the vacuum cleaner  10  or in any other suitable location. The suction motor  80  generates a suction force, as shown in  FIGS. 3, 5, 7 and 8 , at the first inlet  46  and the second inlet  48  in the base  12 , and through a suction path  78 . The motor  80  also drives the brush roll  32 . Alternatively, a separate motor can be used to drive the brush roll  32 . 
     When powered during operation of the vacuum cleaner  10  and the first and second flexible members  50  and  51  are disposed in the closed positions shown in  FIG. 3 , air is drawn into the suction path  78  through the first inlet  46  in the lower surface  22  of the base  12 . When the first and second flexible vent members  50  and  51  are moved to the second positions, as shown in  FIGS. 5 and 7 , air is drawn into the suction path  78  through the first inlet  46  and through the second inlet  48 . The suction path  78  continues to the filter bag (not shown) to collect dirt and debris. The filter bag can be disposed in the housing  14 . 
     The first and second flexible vent members  50  and  51  are preferably made of silicone, rubber, neoprene or polyurethane, although any suitable material can be used. The flexible vent members  50  and  51  preferably have a Shore A durometer between approximately 10 and approximately 90. The first and second vent members  50  and  51  are preferably substantially identical, although the first and second vent members  50  and  51  can be different materials or have different hardnesses to control and adjust a venting operation of the second inlet  48 . 
     As shown in  FIG. 3 , for example, each of the first and second flexible vent members  50  and  51  has a height approximately half of the height of the second inlet  48 , thereby reducing the overall height of the flexible vent member compared to using only a single cover member to cover the second inlet. As shown in  FIG. 9 , the height of the second inlet  48  is the distance from the lower surface of the frame  31  of the base  12  to a lower surface of the recess  33  in the cover plate  30  of the base  12 . Using upper and lower flexible vent members to cover the second inlet  48 , the movement distance of the free ends  54  and  55  of the flexible vent members  50  and  51  into the second inlet  48  is reduced. This configuration allows the surface agitator  32  to be disposed closer to a front interior edge of the suction base  12  because of the reduced height of the first and second flexible vent members  50  and  51 . The first and second flexible vent members  50  and  51  do not require mechanical structure, such as a hinge or a spring, to move between the first and second positions, such that there is no mechanical failure associated with the movement of the first and second flexible vent members  50  and  51 . Additionally, this reduces the manufacturing cost associated with the first and second flexible vent members  50  and  51 . 
     As shown in  FIGS. 1, 8 and 9 , a third inlet  49  can be disposed laterally adjacent the second inlet  48 . The third inlet  49  is in fluid communication with the suction path  78 . The third inlet  49  is preferably substantially identical to the second inlet  48 . The third inlet  49  is preferably defined by a recess  35  in the cover plate  30  and the lower surface of the frame  31  As shown in  FIG. 9 , for example, no portion of the frame  31  is disposed directly below the third inlet  49 . 
     Third and fourth flexible vent members  58  and  59  are connected to the base  12  to cover the third inlet  49 . The third and fourth flexible vent members  58  and  59  are movable between first positions in which the third inlet  49  is substantially covered to substantially prevent fluid from flowing through the third inlet  49  and second positions in which fluid is allowed to flow through the third inlet  49 . The third and fourth flexible vent members  58  and  59  are substantially identical in structure and operation to the first and second flexible vent members  50  and  51 . 
     The foregoing detailed description of the certain exemplary embodiments has been provided for the purpose of explaining the principles of the invention and its practical application, thereby enabling others skilled in the art to understand the invention for various exemplary embodiments and with various modifications as are suited to the particular use contemplated. This description is not necessarily intended to be exhaustive or to limit the invention to the exemplary embodiments disclosed. Any of the exemplary embodiments and/or elements disclosed herein may be combined with one another to form various additional embodiments not specifically disclosed. Accordingly, additional embodiments are possible and are intended to be encompassed within this specification and the scope of the appended claims. The specification describes specific examples to accomplish a more general goal that may be accomplished in another way. 
     In understanding the scope of the present invention, the term “comprising” and its derivatives, as used herein, are intended to be open ended terms that specify the presence of the stated features, elements, components, groups, integers, and/or steps, but do not exclude the presence of other unstated features, elements, components, groups, integers and/or steps. The foregoing also applies to words having similar meanings such as the terms, “including”, “having” and their derivatives. Also, the terms “part,” “section,” “portion,” “member” or “element” when used in the singular can have the dual meaning of a single part or a plurality of parts unless otherwise stated. 
     As used herein, the following directional terms “forward”, “rearward”, “front”, “rear”, “up”, “down”, “above”, “upper”, “below”, “lower”. “upward”, “upwardly”, “downward”, “downwardly”, “top”, “bottom”, “side”, “vertical”, “horizontal”, “perpendicular” and “transverse” as well as any other similar directional terms refer to those directions of a vacuum cleaner in an upright position for use. Accordingly, these directional terms, as utilized to describe the vacuum cleaner should be interpreted relative to a vacuum cleaner in an upright position on a horizontal surface. The terms “left” and “right” are used to indicate the “right” when referencing from the right side as viewed from the rear of the vacuum cleaner, and the “left” when referencing from the left side as viewed from the rear of the vacuum cleaner. 
     Also, it will be understood that although the terms “first” and “second” may be used herein to describe various components, these components should not be limited by these terms. These terms are only used to distinguish one component from another. Thus, for example, a first component discussed above could be termed a second component and vice versa without departing from the teachings of the present invention. The term “attached” or “attaching”, as used herein, encompasses configurations in which an element is directly secured to another element by affixing the element directly to the other element; configurations in which the element is indirectly secured to the other element by affixing the element to the intermediate members) which in turn are affixed to the other element; and configurations in which one element is integral with another element, i.e. one element is essentially part of the other element. This definition also applies to words of similar meaning, for example, “joined”, “connected”, “coupled”, “mounted”, “bonded”, “fixed” and their derivatives. Finally, terms of degree such as “substantially”, “about” and “approximately” as used herein mean an amount of deviation of the modified term such that the end result is not significantly changed. 
     While only selected embodiments have been chosen to illustrate the present invention, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made herein without departing from the scope of the invention as defined in the appended claims. For example, unless specifically stated otherwise, the size, shape, location or orientation of the various components can be changed as needed and/or desired so long as the changes do not substantially affect their intended function. Unless specifically stated otherwise, components that are shown directly connected or contacting each other can have intermediate structures disposed between them so long as the changes do not substantially affect their intended function. The functions of one element can be performed by two, and vice versa unless specifically stated otherwise. The structures and functions of one embodiment can be adopted in another embodiment. It is not necessary for all advantages to be present in a particular embodiment at the same time. Every feature which is unique from the prior art, alone or in combination with other features, also should be considered a separate description of further inventions by the applicant, including the structural and/or functional concepts embodied by such feature(s). Thus, the foregoing descriptions of the exemplary embodiments according to the present invention are provided for illustration only, and not for the purpose of limiting the invention as defined by the appended claims and their equivalents.