Patent Publication Number: US-10314450-B2

Title: Vacuum cleaner envelope

Description:
FIELD OF THE INVENTION 
     The present invention relates to vacuum cleaner envelopes, and to related methods of use of vacuum cleaner envelopes. 
     BACKGROUND TO THE INVENTION 
     Vacuum cleaners are typically used for domestic and industrial cleaning of dirt. Solid and/or liquid dirt is aspirated by the vacuum cleaner such that the dirt is communicated via a fluid path from a nozzle to a collection chamber. The fluid path for a vacuum cleaner includes the nozzle, a conduit and the material collection chamber of the vacuum cleaner. If the dirt is wet and/or is fine (for example dry wall material or dust from a sander), or is hazardous (for example bodily fluid), dirt residue may remain in the vacuum cleaner resulting in bacterial growth, odour problems and environmental health risks. Emptying and cleaning the fluid path to avoid these problems is dirty, unhygienic and potentially dangerous to a user. 
     US 2008/127832 A1 discloses an envelope for use with a vacuum cleaner according to the preamble of claim 1. 
     Example embodiments of the present invention aim to address at least one of the issues identified above, or related issued. 
     SUMMARY OF THE INVENTION 
     An envelope for use with a vacuum cleaner is provided. The envelope comprising flexible material arranged to provide a fluid path there-through, and further comprising a coupling arranged to couple the envelope to a structural member for in use maintaining the fluid path open by supporting the envelope against external pressure; wherein: the envelope is arranged in use to isolate, from the fluid path, the structural member that supports the envelope. 
     Furthermore, an envelope assembly for use with a vacuum cleaner is provided. The envelope assembly comprising: 
     an envelope for use with a vacuum cleaner and comprising flexible material arranged to provide a fluid path there-through, and further comprising a coupling arranged to couple the envelope to a structural member for in use maintaining the fluid path open by supporting the envelope against external pressure; and 
     the structural member that is coupled to the coupling and that supports the envelope, wherein: 
     the envelope isolates, from the fluid path, the structural member. 
     In one example embodiment, the coupling is arranged to receive a plurality of structural members. In one example embodiment, a plurality of said couplings are provided. 
     In one example embodiment, the envelope comprises one or more of a flexible polymer; a flexible plastic; a flexible rubber; a flexible textile. The envelope comprises an impermeable material, such as a material that inhibits passage of liquids there-through, for example a waterproof material, or a solvent-resistant material. In this way, the envelope provides a fluid path, for example a path for liquid and/or gas and/or dispersion and/or a suspension of solids in a liquid and/or gas. In this way, the envelope provides a barrier between the fluidic path internally and its surroundings externally. 
     In one example embodiment, the envelope is arranged to in use receive dirt, in solid or liquid form. In one example embodiment, the envelope is arranged to in use retain dirt, in solid or liquid form, therein. In one example embodiment, the envelope comprises a collection chamber for dirt, in solid or liquid form. In one example embodiment, the envelope comprises a collection chamber for dirt, in solid or liquid form that receives and retains dirt therein. In this way, the envelope may be used to receive and retain, for example, wet and dry spillages, industrial spillages, builders&#39; debris, hospital waste, and/or animal excrement. 
     In one example embodiment, the envelope comprises one or more of a biodegradable material; a compostable material; a recyclable material; a burnable material. In one example embodiment, the envelope comprises material having portions of different gauges, for example different thicknesses. In one example embodiment, the envelope comprises a transparent material. In this way, fitment and usage of the envelope may be facilitated. In one example embodiment, the envelope is provided with a distinguishing mark, for example a coloured portion. In this way, different types of envelope suitable for various categories of waste may be denoted according to their intended use. 
     In one example embodiment, the envelope provides a fluid path with a single inlet and a single outlet. That is, in one example embodiment the envelope provides a fluid path between an inlet and an outlet, said fluid path not comprising additional inlets and/or outlets and/or holes and/or perforations therein. 
     In one example embodiment, the envelope provides an elongate fluid path therethrough. In one embodiment, the envelope is arranged to, in use, form a generally circular cross-section. In one example embodiment, the envelope is arranged to, in use, form a constant cross-section along its length. In example embodiments, the envelope comprises one or more of: a tubular shape, a cylindrical shape, a conical shape, a spherical shape, a pyramidal shape. 
     In one example embodiment, the envelope is packable, for example by rolling and/or by folding. For example, the envelope may be flattened such that the fluid path there-through is collapsed, such as by bringing a portion of an internal surface of the fluid path proximal to an opposing portion of the internal surface of the fluid path. In this way, for example, an envelope may be packed into a roll, for example, or a dispensing canister or cassette, either as an individual unit or in association or combination with further such envelopes. 
     In one example embodiment, the envelope is associated with a second such envelope. For example, the envelope may be arranged with a second such envelope to be cut and/or tom or otherwise detached from said second envelope. In this way, two, three or more generally a plurality of such envelopes may be manufactured and supplied, for example, on a roll or in a dispensing canister or cassette. 
     The coupling is arranged to receive a structural member in coupling the envelope thereto. The coupling comprises a conduit and/or channel and/or cavity and/or seam and/or support fixture arranged to couple a structural member thereto. In one example embodiment, the coupling comprises a plurality of conduits and/or channels and/or cavities and/or seams and/or support fixtures arranged to couple a structural member thereto, for example by receiving a structural member and/or a plurality of structural members in one or more thereof. In one example embodiment, the coupling is arranged to receive a structural member within the material of, such as within a wall portion of the envelope. The coupling may be arranged to partly or wholly receive a structural member therein. 
     In one example embodiment, the coupling is arranged to couple a structural member to the envelope proximal a surface of the envelope, for example, an outer surface and/or an inner surface of the envelope. The envelope is arranged to isolate a structural member from the fluid path in use. In this way, a structural member is in use not in fluid communication with fluid in the fluidic path so the structural member does not become contaminated by dirt in the fluid path. 
     In one example embodiment, the coupling is arranged to in use couple a structural member to the envelope in a manner by which the structural member does not obstruct movement along the fluid path. 
     In one example embodiment, the envelope comprises an inlet adapted to in use cooperate with a cleaning nozzle of a vacuum cleaner. In this way, dirt may in use enter the envelope, passing into the fluid path. 
     In one example embodiment, the envelope comprises an outlet adapted to in use cooperate with a suction unit of a vacuum cleaner. In this way, air may exit the envelope into, passing out of the fluid path and into a suction unit of a vacuum cleaner. 
     In one example embodiment, the envelope comprises a first chamber to, in use receive incoming fluid, and/or in use to collect dirt. In one example embodiment, the first chamber is located proximate an inlet of the envelope. In one example embodiment, the envelope comprises a second chamber, the second chamber located proximate to an outlet of the envelope. In one example embodiment there is provided a divider in the fluid path, the divider arranged between first and second chambers in the fluid path. In one example embodiment, the divider comprises a partial obstruction in the fluid path. In one example embodiment the first chamber comprises a collection chamber for dirt. 
     In one example embodiment, the envelope comprises a flow diverter, such as provided by a flow member. In one example embodiment, the flow diverter is arranged to, in use, deflect and/or divert fluid in the fluid pathway. In one example embodiment, a flow diverter comprises a flow member arranged to in use provide a partial obstruction in the fluid path. 
     In one example embodiment, the flow diverter comprises a rigid flow deflector. In one example embodiment, the flow diverter comprises a tongue that extends into the fluid pathway. In this way, dirt may be deflected into, for example, a collection chamber of the envelope. 
     In one example embodiment, the envelope in use comprises a non-linear fluid path. In one example embodiment, an inlet and an outlet of the envelope are arranged on a same lateral side of the envelope chamber, with the flow diverter arranged axially there-between. In one example embodiment, the envelope comprises a flow diverter in the form of a baffle and/or partial barrier arranged in use between an inlet and an outlet of the fluid pathway. 
     In one example embodiment, the envelope comprises a flow member arranged to, in use, slow fluid in the fluid pathway. In one example embodiment, the envelope comprises a flow member arranged to, in use, slow fluid in the fluid pathway whereby the dirt entrained therein is retained in, for example by falling into a collection chamber of the envelope. 
     In one example embodiment, the envelope comprises an inlet in fluid communication with a collection chamber and a flow member arranged in the fluid pathway such that in use air and dirt enters the envelope at the inlet, is deflected by the flow member into the collection chamber, the dirt is slowed and/or falls into the collection and air exits the collection chamber to then pass from the envelope through an outlet of the envelope. 
     In one example embodiment, the envelope comprises reinforcement. In one example embodiment, the envelope comprises reinforcement arranged to reinforce and/or support the flow diverter. 
     In one example embodiment, the coupling is arranged to receive a structural member by insertion and/or pushing and/or pulling and/or clipping into and/or onto the envelope. In one example embodiment, the coupling is arranged to receive the structural member by insertion and/or pushing and/or pulling and/or clipping into and/or onto the coupling. For example, a structural member may be inserted into a wall portion of the envelope. 
     In one example embodiment, the coupling is arranged for removal of a structural member in which the structural member is retracted and/or removed and/or pushed and/or pulled and/or unclipped from and/or out thereof. For example, a structural member may be pulled from within a wall portion of the envelope. 
     In one example embodiment, a structural member is arrangeable to extend along an axis of the envelope. For example, a structural member comprises a rod to span the envelope along its axis. In one example embodiment, a structural member may in use be arranged to extend across a diameter of the envelope. In one example embodiment, a structural member may in use be arranged to extend around a diameter of the envelope. For example, a structural member may comprise a ring. In one example embodiment, a structural member may in use be arranged to extend along an axis of the envelope and around a diameter of the envelope. For example, a structural member may in use be arranged as a helical support for the envelope. In one example embodiment, the structural member may comprise a rod arranged to be inserted into a conduit provided by or in the envelope. For example, a straight rod (e.g. a flexible straight rod) may be inserted into a helical conduit, or a helical rod may be inserted into a helical conduit. 
     In one example embodiment, a structural member may comprise a conduit extending along a bore thereof. In this way, a fluid, for example a gas, such as air, may be communicated along the structural member. In one example embodiment, a structural member may be partly inserted into a conduit in an envelope and a fluid, for example a gas, may be communicated along the structural member. In this way, a conduit in an envelope arranged to receive a structural member may be inflated to facilitate insertion of the structural member into the conduit. 
     In one example embodiment, a structural member is arranged to support the envelope so as to, in use, maintain the fluid path provided by the envelope. That is, the structural member tends to maintain a volume enclosed by the envelope. For example, a structural member may resist the envelope, in use, from collapsing when the envelope is used with a vacuum cleaner, for example, when pressure inside the envelope is less than pressure outside the envelope. 
     In one example embodiment, the coupling is arranged to couple the envelope to a plurality of structural members, for example, two or more structural members. In one example embodiment, the envelope is arranged to receive a plurality of similar structural members, for example, two or more structural members in which the structural members are the same shape and/or size and/or type and/or stiffness and/or rigidity. In one example embodiment, the envelope is arranged to receive a plurality of dissimilar structural members, for example, two or more structural members in which the structural members are of different shape and/or size and/or type and/or stiffness and/or rigidity. 
     In one example embodiment, the envelope assembly comprises a plurality of structural members, for example, two or more structural members, in which the structural members are similar. In one example embodiment, the envelope assembly comprises a plurality of structural members, for example, two or more structural members, in which the structural members are dissimilar. 
     In one example embodiment, the envelope comprises a closure feature. In one example embodiment, the envelope comprises a plurality of closure features. In one example embodiment, the closure features are arranged to be closable, for example tied and/or sealed and/or bonded to close the envelope, for example, at one end and/or both ends of the envelope. In one example embodiment, the envelope comprises closure features, such as a tie and/or seal at one end or both ends. In this way, an envelope containing dirt may be closed so as to facilitate hygienic disposal of the envelope with the dirt therein. 
     In one example embodiment, the coupling is arranged to couple the envelope to one or more of structural members such that the envelope is, in use, stressed by the structural member(s). For example, a tensile stress may be induced by the structural member in wall portions of the envelope. In use, a structural member may be rotated and/or translated and/or stressed itself, to provide a means by which the envelope is put under stress e.g. tension. 
     In one example embodiment, the envelope comprises a fixing arranged to fix the envelope to the vacuum cleaner. In one example embodiment, the envelope may comprise one or more fixings at the inlet and/or outlet of the fluid path so that the envelope may in use be fixed to one or more parts of a vacuum cleaner. 
     In one example embodiment, the fixings may comprise a fixing member e.g. a ring connector at an end of the envelope to in use fix the envelope to an outlet or fan or motor or a nozzle or a suction chamber of a vacuum cleaner. 
     In one example embodiment, the envelope comprises a filter and/or filter membrane. For example, the envelope may comprise a HEPA filter. For example, the fixing member e.g. ring connector may comprise a biodegradable and/or disposable filter membrane. In one example embodiment, the envelope comprises a fixing that includes or cooperates with a filter and/or filter membrane of the envelope. 
     A further example embodiment provides a vacuum cleaner system comprising:
         a vacuum cleaner;   an envelope assembly substantially as described herein, with particular reference to the example embodiments set out above.       

     A still further example embodiment provides a kit of parts including:
         an envelope substantially as described herein, with particular reference to the example embodiments set out above; and   a structural member arrangeable in use to support the envelope.       

     An example embodiment provides a method of using an envelope with a vacuum cleaner, wherein the envelope is substantially as described herein, with particular reference to the example embodiments set out above, the method comprising:
         supporting the envelope with a structural member;   fixing the envelope to the vacuum cleaner;   operating the vacuum cleaner to collect dirt in the envelope.       

     In one example embodiment, the method comprises receiving the structural member into the envelope. In one example embodiment, the method comprises fixing an end of the envelope to the vacuum cleaner. In one example embodiment, the method comprises a subsequent step of removing the envelope from the vacuum cleaner. In one example embodiment, the method comprises closing the envelope. In one example embodiment, the method comprises removing the structural member from the envelope. In one example embodiment, the method comprises disposing of the envelope. 
     In one example embodiment, the envelope may be fixed to the vacuum cleaner and subsequently, a structural member may be provided to support the envelope. For example, the envelope may be attached to a vacuum cleaner and subsequently, a structural member may be inserted into the envelope. 
     According to the present invention there is provided an apparatus and method as set forth in the any appended claims. Other features of the invention will be apparent from any dependent claims, and the description which follows. 
    
    
     
       BRIEF INTRODUCTION TO THE DRAWINGS 
       For a better understanding of the invention, and to show how embodiments of the same may be carried into effect, reference will now be made, by way of example, to the accompanying diagrammatic drawings in which: 
         FIG. 1  shows a schematic side elevation of an envelope according to an example embodiment; 
         FIG. 2  shows a schematic cross sectional view of the envelope of  FIG. 1 ; 
         FIG. 3  shows a schematic cross sectional view of the envelope of  FIG. 1 , in use; 
         FIG. 4 a    shows a schematic elevation of a flow diverter according to an example embodiment. 
         FIG. 4 b    shows a schematic plan view of the example embodiment of  FIG. 4   a;    
         FIG. 5  shows a schematic cross sectional view of an envelope according to another example embodiment; 
         FIG. 6  shows a schematic cross sectional view of an envelope according to yet another example embodiment; 
         FIG. 7  shows a schematic plan view of an envelope according to an example embodiment, said envelope being related to the envelope of  FIG. 1 ; 
         FIG. 8  shows a schematic plan view of an envelope according to an example embodiment, said envelope being related to the envelope of  FIG. 1 ; 
         FIG. 9  shows a schematic side elevation of an envelope according to still yet another example embodiment; 
         FIG. 10  shows a schematic cross sectional view of the example embodiment of  FIG. 9 ; 
         FIG. 11  shows yet another schematic cross sectional view of the example embodiment of  FIG. 9 ; 
         FIG. 12  shows a schematic cross sectional view of an envelope according to still yet another example embodiment; 
         FIG. 13  shows a schematic cross sectional view of an envelope according to still yet another example embodiment; 
         FIG. 14  shows a schematic plan view of the example embodiment of  FIG. 12 ; 
         FIG. 15  shows a schematic plan view of an embodiment related to the example embodiment of  FIG. 13 ; 
         FIG. 16  shows a schematic plan view of the example embodiment of  FIG. 13 ; 
         FIG. 17  shows a schematic cross sectional view of the example embodiment of  FIG. 13 ; 
         FIG. 18  shows a schematic cross sectional view of an envelope according to still yet another example embodiment; 
         FIG. 19  shows a schematic cross sectional view of an envelope according to still yet another example embodiment, in use; 
         FIG. 20  shows a schematic cross sectional view of a vacuum cleaner according to an example embodiment; 
         FIG. 21  shows a schematic cross sectional view of an envelope according to still yet another example embodiment; 
         FIG. 22  shows a schematic perspective view of an envelope according to still yet another example embodiment; 
         FIG. 23  shows a schematic perspective view of an envelope according to still yet another example embodiment; 
         FIG. 24  shows a schematic perspective view of a structural member according to an example embodiment; 
         FIG. 25  shows a schematic plan view of the example embodiment of  FIG. 23 ; 
         FIG. 26 a    shows a schematic elevation of a locator member assembly according to an example embodiment; 
         FIG. 26 b    shows a schematic exploded perspective elevation of the locator member assembly according to the example embodiment of  FIG. 26   a;    
         FIG. 27  shows a schematic elevation of a locator member assembly according to another example embodiment; 
         FIG. 28  shows a schematic elevation of dispensing canister according to an example embodiment; 
         FIG. 29  shows a schematic cross sectional view of the dispensing canister of  FIG. 28 ; 
         FIG. 30  shows a schematic cross sectional view of an envelope according to still yet another example embodiment; and 
         FIG. 31  shows a method of using an envelope according to an example embodiment. 
     
    
    
     DESCRIPTION OF EXAMPLE EMBODIMENTS 
     With reference to the drawings, similar reference numerals denote corresponding features unless described otherwise. 
       FIGS. 1 and 2  show an envelope  10  according to an example embodiment. Envelope  10  is arranged to receive a structural member (not shown) such that in use, a shape of envelope  10  is maintained. The envelope  10  comprises a tube  20  and a generally cylindrical collection chamber  30 , in which a longitudinal axis of tube  20  is arranged parallel to a longitudinal axis of collection chamber  30  and an outer portion of tube  20  is coupled to an outer portion of the collection chamber  30 . The envelope  10  comprises an inlet  16  at one end of tube  20  and an outlet  18  at the other end of tube  20 . The tube  20  comprises an inlet end  22 , corresponding to the inlet  16  of the envelope  10  and an outlet end  24 . The collection chamber  30  comprises first chamber, in the form of an inlet chamber  32  and a second chamber in the form of an outlet chamber  34 . Inlet end  22  of tube  20  is in fluid communication with inlet chamber  32  of collection chamber  30  through opening  26 . Outlet end  24  of tube  20  is in fluid communication with outlet chamber  34  of collection chamber  30  through opening  28 . The envelope  10  also comprises a flow diverter  40 , coupled to a wall of tube  20  and extending into cylinder  30 , normal to a wall of tube  20  and collection chamber  30 , through an opening  26 ,  28  in a wall of tube  20  into cylinder  30 . The flow diverter  40  partitions the inlet end  22  from the outlet end  24  of tube  20  and partially partitions the inlet chamber  32  from the outlet chamber  34  in the collection chamber  30 . In this way, a fluid path comprises inlet  16 , tube inlet end  22 , tube inlet opening  26 , inlet chamber  32 , outlet chamber  34 , tube outlet opening  28 , tube outlet end  24  and outlet  18 . 
     The envelope is formed of flexible material, in which the flexible material may be impervious and/or biodegradable and/or comprise a plastic. The tube  20  and collection chamber  30  are formed together such that envelope  10  is impervious and non-porous along its length between the inlet  16  and the outlet  18 . The tube  20  in use can operate as the nozzle, or fixed to the nozzle of a vacuum cleaner and the collection chamber  30  can collect dirt, inhibiting the passage of dirt into the suction chamber of the vacuum cleaner via the outlet  18 , the outlet being fixed to the vacuum produced by the vacuum cleaner. 
     The envelope  10  may comprise material of a gauge (for example, thicknesses of plastic) to handle heavier industrial cleaning tasks. The envelope  10  is in this example embodiment generally transparent to aid fitment to a vacuum cleaner, with a coloured portion provided to denote the particular category of waste that the envelope  10  is intended to be used for. 
       FIG. 3  shows the envelope  10  in use. The envelope  10  is arranged to receive a structural member (not shown) such that in use, a shape of envelope  10  is maintained despite suction being applied to the fluid pathway by the vacuum cleaner in use. Fluid  50  (for example, air comprising particles of dirt  52  enters envelope  10  at inlet  16  and is deflected by flow diverter  40  as the air and particles of dirt  52  move into the collection chamber  30 . Particles of dirt  52  are slowed by the flow diverter  40  and fall into inlet chamber  32 , where they collect. Air exits the cylinder  30  at the tube outlet  28  and then passes from the outlet  18 . The envelope  10  is reinforced, where dirt  52  hits the flow diverter  40 . 
       FIGS. 4 a  and 4 b    show a flow diverter  440 ′ for use with another example embodiment, in which the flow diverter  440 ′ comprises a polymeric semi-circular hollow extrusion and an attachment means arranged on a curved outer surface at an end. The flow diverter  440 ′ may reinforce and/or support an envelope according to an example embodiment, in which the envelope isolates the flow diverter  440 ′ from the fluidic path. 
       FIG. 5  shows an envelope  510  according to another example embodiment, comprising a tube  520  in fluid communication with a cylindrical collection chamber  530  and further comprising flow diverter cover  540 , arranged on, and normal to, an inner surface of the envelope  510  to, in use, deflect a fluid into the collection chamber  530 . The flow diverter cover  540  is arranged to receive a flow diverter, such as flow diverter  440 ′. In this way, the flow diverter  440 ′ may provide structural reinforcement for flow diverter cover  540 , without the flow diverter  440 ′ being contaminated by dirt. The envelope  510  is also arranged to receive a structural member (not shown) such that in use, a shape of envelope  510  is maintained. 
       FIG. 6  shows an envelope  610  according to yet another example embodiment, comprising a tube  620  in fluid communication with a cylindrical collection chamber  630  and further comprising a flow diverter  640  of yet another example embodiment, related to the embodiments of  FIGS. 4 and 5  by way of function. The flow diverter  640  comprises a planar member arranged on, and normal to, an inner surface of the envelope  610  to, in use, deflect a fluid into the collection chamber  630 . The envelope  610  is also arranged to receive a structural member (not shown) such that in use, a shape of the envelope  610  is maintained. 
       FIG. 7  shows an envelope  710  comprising a tube  720  in fluid communication with a cylindrical collection chamber  730  and further comprising a flow diverter  740  arranged at a fluid interface between the tube  720  and collection chamber  730 . The flow diverter  740  extends across a portion of the tube  720  and substantially across a cross-section of collection chamber  730 , thereby partly dividing collection chamber  720  into two parts, in which the two parts are in fluid communication through a circular opening  742 . The envelope  710  is also arranged to receive a structural member (not shown) such that in use, a shape of envelope  710  is maintained. 
       FIG. 8  shows an envelope  810  comprising a tube  820  and in fluid communication with a cylindrical collection chamber  830  and further comprising a flow diverter  840  arranged at a fluid interface between the tube  820  and collection chamber  830 . The flow diverter  840  extends across a cross-section of tube  820  and substantially across a cross-section of cylinder  830 , thereby partly dividing collection chamber  720  into two parts, in which the two parts are in fluid communication through an opening  842 . Envelope  810  is arranged to receive a structural member (not shown) such that in use, a shape of envelope  810  is maintained. 
       FIGS. 9 and 10  show an envelope  910  according to still yet another example embodiment, comprising a tube  920  in fluid communication with a cylindrical collection chamber  930  and a flow diverter  940 , arranged at a fluid interface between tube  920  and collection chamber  930 . The tube  920  is arranged concentrically with collection chamber  930 . Flow diverter  940  is arranged proximal an outlet end  918  of tube  920  extends across a diameter of tube  920  and extends across a radius of cylinder  930 . The envelope  910  is also arranged to receive a structural member (not shown) such that in use, a shape of envelope  910  is maintained. 
       FIG. 11  shows an envelope  1110  according to still yet another example embodiment. Flow diverter  1140  is arranged proximal the outlet end  1118 , extends across a diameter of tube  1120  and extends partly across a radius of cylinder  1130 , so as to form a baffle to disrupt a flow of air through the envelope. The envelope  1110  is also arranged to receive a structural member (not shown) such that in use, a shape of envelope  1110  is maintained. 
       FIGS. 12 and 14  show an envelope  1210  according to still yet another example embodiment. Tube  1220  comprises a first part  1220   a  proximal the inlet  1216  and a second part  1220   b  proximal the outlet  1218 . The flow diverter  1240  comprises a truncated cone and is arranged partly across a diameter of cylinder envelope  1230 . The envelope  1210  is arranged to receive a structural member (not shown) such that in use, a shape of envelope  1210  is maintained. 
       FIGS. 13 and 15  show an envelope  1310  according to still yet another example embodiment. Flow diverter  1340  comprises a truncated cone and is arranged partly across a diameter of cylinder  1330 .  FIG. 16  shows a related embodiment of a flow diverter  1640 . The envelope  1310  is also arranged to receive a structural member (not shown) such that in use, a shape of envelope  1310  is maintained. 
       FIG. 16  shows an envelope  1610  according to still yet another example embodiment. Tube  1620  comprises a first part  1620   a  (not shown) proximal the inlet  1216  (not shown) and a second part  1620   b  (not shown) proximal the outlet  1618 . Flow diverter  1640  comprises a plane arranged partly across a diameter of cylinder envelope  1630 . Envelope  1610  is arranged to receive a structural member (not shown) such that in use, a shape of envelope  1610  is maintained. 
       FIG. 17  shows an envelope  1710  according to still yet another example embodiment. Tube  1720  comprises a double-walled plastic bag arranged to receive a first structural member  1760 , in which the first structural member  1760  comprises a helical rod. Cylinder  1730  comprises a double-walled plastic bag arranged to receive a second structural member  1770 , in which the second structural member  1770  comprises a helical rod. Tube  1720  and cylinder  1730  may be formed to match a shape and a position of the first structural member  1760  and second structural member  1770  respectively and to comprise a flow deflector  1740 , by manufacturing and/or fusing and/or heat sealing and/or gluing a double-walled plastic bag. Openings  1726  &amp;  1728  are formed in the tube  1720  between consecutive helical turns of the first structural member  1760 . 
       FIG. 18  shows a schematic cross sectional view of an envelope  1810  according to still yet another example embodiment, in which tube  1820  is arranged to receive a first structural member  1860   a  and a second structural member  1860   b  in a helical conduit formed in a wall of the envelope  1810 . First structural member  1860   a  and second structural member  1860   b  comprise helical rods that may be inserted into the helical conduit in the envelope  1810 . By displacing first structural member  1860   a  relative to second structural member  1860   b , the envelope  1810  may be stressed, thereby supporting a shape of the envelope  1810 . 
     While some examples of the structural member have been described, the structural member should not be considered limited to these descriptions and other examples of structural members may be provided e.g. an umbrella-style structural member in which a biased (i.e. sprung or tensioned or compressive) member supports the envelope. 
       FIG. 19  shows a schematic cross sectional view of an envelope  1910  according to still yet another example embodiment, in use. Envelope  1910  comprises a tube  1920  arranged to receive and comprises a structural member  1960 . The cylinder  1930  is arranged to receive and comprises a structural member (not shown). Fluid  1950  (for example, air and/or dirt) enters envelope  1910  at inlet  1916  and is deflected by flow diverter  1940 . Dirt  1952  is slowed by flow diverter  1940  and falls into cylinder inlet chamber  1932 , where the dirt  1954  collects. Air  1956  exits the cylinder  1930  at tube outlet  1928  and hence outlet  1918 . 
       FIG. 20  shows a schematic cross sectional view of a vacuum cleaner  2001  according to an example embodiment. Vacuum cleaner  2001  comprises a retractable handle  2080 , a fill point &amp; stopper  2081 , a water tank  2083 , a water pipe to envelope  2084 , a battery  2085 , a circuitry and/or water valve and/or spray  2086 , an electric motor  2087 , a downwards vent  2088 , a fan  2089 , an optional HEPA filter  2090 , an envelope holder  2091  (e.g. male locator member  2680 , as described below), structural member storage and deployment mechanism and an optional water nozzle  2092 . 
     Vacuum/fan of vacuum cleaner  2001  has suck and blow functions and comprises an IC unit. There may be a moisture monitor at or near the fan and the IC may shut down the motor/close access to the motor/fan at pre-determined moisture levels. Motor  2087  may be DC, AC and/or BLOC (brushless). A level sensor in this embodiment provided as a spirit level is arranged to monitor the horizontal position of the vacuum cleaner and warn the user and/or shut down the device/close access to the motor/fan if the vacuum is tilted beyond a certain angle. A moisture monitor may be replaced by a flotation valve in other embodiments. A fluid storage tank and spray/pump may be fitted to allow fluid to be dispensed into the material collection chamber through the outlet; and prior to usage and/or after usage of the envelope to spray a spoilage area. Fluid may comprise water and may further comprise: an anti-bacterial agent and/or a surfactant; and/or a detergent; and/or a scent. 
     Vacuum cleaner  2001  and envelope  10  may be of small portable design, for example a handheld portable unit with handle extender placing the vent of the fan near ground level and away from the user for hygienic vacuuming of pet excrement, or a garden vacuum cleaner (e.g. a leaf blower that also comprises a vacuum cleaner function) or a pool vacuum cleaner (e.g. for catching and containing floating or sunken effluent or debris), or may be scaled up for larger industrial wheeled units with appropriate industrial specifications. The motor and fan may be scaled up or down to suit the intended cleaning task. Whilst some examples of a type of vacuum cleaner and application of the vacuum cleaner have been described, these examples are not to be considered limiting to the type of vacuum cleaner and other examples may be provided of other types of vacuum cleaners and applications. 
     A number of envelopes  10  may be stored and attached to the vacuum cleaner  2001  with all envelopes  10  having aligned open fluid path holes and staggered structural member holes, each of which is close ended. Each envelope  10  could be attached to the following envelope  10  with perforations to aid removal. Turning the envelope  10  and fixing member or the structural member moves the structural member to the next unused envelope. Envelopes  10  may be held within a removable dispensing canister at or near the fan such that each new envelope may be pushed from the canister. Alternatively the envelope  10  may be individually inserted and removed possibly with its own attached filter mounted on a fixing member such as a ring. The vacuum cleaner  2001  may be used on an extending arm with the fan(s) venting downwards, away from the user. 
     The optional use of a small, disposable filter and addition of water in the envelope to aid dirt capture means that larger filters that reduce the power of conventional vacuum cleaners are not necessarily required. If outside there would be no need for further filters, however indoors a HEPA filter could be fitted either before and/or after the fan(s). A surfactant may be added to the water to decrease surface tension and aid dirt capture. 
     Sensors may connect with an IC to monitor angle of tilt/moisture levels and ensure cut-off/closure of a valve preventing damage to the motor. The IC may manually or automatically cycle through a number of phases e.g. fan in low reverse to push air through hollow structural members to inflate envelope  10  and allow easier insertion of structural member, structural member may be automatically pushed by motor into the envelope  10 . Then, after vacuuming, inflation into a structural member may aid retraction of structural member from the envelope  10 . 
     Vacuum cleaner  2001  may be small and easily portable with an extending arm, limited battery life, power and volume to hygienically vacuum small pet excrement or scalable to larger animals or other purposes such as industrial applications including hospital cleaning and capturing of saw dust. Vacuum cleaner  2001  may in other embodiments have wheels, be hand held, be of a canister vacuum cleaner, a back pack vacuum cleaner or be configured to collect liquids or be centrally fitted. 
     For outside portable use as animal excrement remover, the vacuum cleaner  2001  need only have sufficient battery life for a few short bursts of usage, for example 3 to 5 minutes total, a small collection chamber size for a small amount of excrement, a smaller motor and short inlet tube placing device as close as possible to the ground, a biodegradable envelope  10  and filter so envelope  10  may be sealed and disposed of easily and hygienically. The only part of the vacuum cleaner  2001  that may experience any contamination is after the filter (fan and outside vent). If envelope  10  perforates and/or is damaged, a structural member may be washed/fully immersed in solution to clean. The fixing member may be made comprise cardboard and/or plastic; the membrane making up the envelope may comprise a polymer e.g. polylactide. 
       FIG. 21  shows a schematic cross-sectional view of an envelope according to still yet another example embodiment, further comprising a wheel  2199 , to facilitate transportation of envelope  2110  as part of a vacuum cleaning system. 
       FIG. 22  shows a schematic perspective view of an envelope  2210  according to still yet another example embodiment. Tube  2220  comprises openings  2226  and  2228 . Flow deflector  2240  extends across a cross section of tube  2220  and extends substantially across a cross section of cylinder envelope  2230 . Cylinder  2230  is arranged to receive a first circular structural member  2272   a , for example a hoop, in a double-walled pocket of envelope  2210  arranged around a circumference of the cylinder envelope  2230  at one end of the cylinder envelope  2230  and a second circular structural member  2272   b , for example a hoop, in a double-walled pocket of envelope  2210  arranged around a circumference of the cylinder envelope  2230  at the other end of the cylinder envelope  2230 . Cylinder  2230  is also arranged to receive a longitudinal structural member  2274 , fixing structural members  2272   a  and  2272   b , extending from one end of the cylinder  2230  to the other end of the cylinder  2230 . In this way, a structural member may be inserted into a pocket of envelope  2210  so as to, in use, maintain a shape of envelope  2210 . 
       FIG. 23  shows a schematic perspective view of an envelope  2310  according to still yet another example embodiment. Tube  2320  comprises openings  2326  and  2328 . Flow deflector  2340  extends across a cross section of tube  2220  and extends substantially across a cross section of cylinder envelope  2330 . Cylinder  2330  is also arranged to receive a plurality of structural members  2374  extending from one end of the cylinder  2330  to the other end of the cylinder envelope. Envelope  2310  comprises a plurality of structural members  2374  in use. Tube  2320  is also arranged to receive a structural member (not shown). 
       FIG. 24  shows a schematic perspective view of two structural members  2374  according to an example embodiment, for use, for example with the example embodiment of  FIG. 23 . For example, structural member  2374  may be inserted into and/or retracted from the cylinder  2330  of the envelope  2310 . Structural member  2374  comprises a rod comprising two parts: a longitudinal part  2374   a  coupled at one end to a curved part  2374   b , in which curved part  2374   b  extends along substantially half a circumference in a plane orthogonal to longitudinal part  2374   a.    
       FIG. 25  shows a schematic plan view of an envelope  2310 . Envelope  2310  is arranged to receive longitudinal part  2374   a  in a longitudinal cavity of cylinder  2330  and is further arranged to receive curved part  2374   b  in a pocket in an end of cylinder  2330 . In use, a longitudinal part  2374   a  is rotated about its longitudinal axis, thereby tending to rotate a coupled curved part  2374   b , thereby tensioning cylinder  2330 . 
     In a further embodiment of  FIG. 25 , envelope  2310  is arranged to receive longitudinal part  2374   a  in a longitudinal cavity of cylinder  2330  supported by curved part  2374   b  at the outlet  2324  end of cylinder  2330 . In use, a longitudinal part  2374   a  is extended into a conduit within envelope  2310  then rotated about its longitudinal axis by rotating the coupled curved part  2374   b , thereby tensioning cylinder  2330 . 
       FIG. 26 a    shows a schematic elevation of a male locator member  2680  according to an example embodiment. Male locator member  2680  may be arranged to couple an envelope, for example envelope  910 , to a vacuum cleaner. Male locator member  2680  comprises a ring, comprising plastic and/or cardboard, to receive an envelope and one or more structural members. A male locator member  2680  may be arranged to receive an envelope, for example envelope  910 , in which envelope  910  may be coupled (e.g. bonded during manufacturing for supply to a user in a bonded form) to the male locator member  2680  so as to provide a relative alignment of male locator member  2680  and envelope  910 . Alternatively, a pair of male locator members  2680  may be arranged to receive the envelope  910 , in which envelope  910  is be arranged between the pair of male locator members  2680  (i.e. sandwiched between the pair of male locator members  2680 ) so as to provide a relative alignment of the pair of male locator members  2680  and envelope  910 . The male locator member  2680  or pair of male locator members  2680  are coupled to cylinder  930  proximal outlet  918 . For example, the male locator members  2680  may be received by a mating coupling (not shown) provided by a vacuum cleaner or by mating coupling (not shown) that comprises a push-fit type attachment suitable for attachment to a vacuum cleaner hose. This mating coupling arrangement allows the user to reliably and easily fit the envelope  910  to the vacuum cleaner, without for example the user being required to sandwich the envelope  910 . A bore of male locator member  2680  is arranged to receive a fluidic path provided by outlet  924  of envelope  910 . Five equidistant circular openings  2684   a  are arranged on a locus of male locator member  2680 , wherein each opening  2684   a  is arranged to receive a structural member  2374   a . A semi-circular perforated tear line  2684   b  is arranged on an outer diameter of male locator member  2680  and around an opening  2684   a . Five equidistant semi-circular openings  2682   a  are arranged on an outer diameter of male locator member  2680  and between openings  2684   a . A further circular opening  2690  is arranged at a radius of male locator member  2680 , to receive another structural member (e.g. helical structural member  1760 ). By coupling the male locator member  2680  to the envelope  910 , a relative alignment of male locator member  2680  and envelope  910  may be provided. Particularly, the relative alignment of the circular opening  2684   a , arranged to receive structural members  2374   a , and the relative alignment of the circular opening  2690 , arranged to receive a structural member (e.g. helical structural member  1760 ) and the outlet end  918  of envelope  910  may be provided. For example, structural members  2374   a  may be inserted e.g. pushed into the envelope  910  in tandem with rotation of the helical structural member  1760 , unwrapping a compacted envelope  910  until at full tension/extension and then (as shown in  FIG. 25 ), the structural members  2374   a  rotate outwards tearing away from the male locator member  2680  along tear line  2684   b  and unwrapping the envelope  910 , locking at full deployment of the cylinder  930 . 
       FIG. 26 a    also shows a schematic elevation of a female locator member  2688 , arranged to receive male locator member  2680  and arranged to be coupleable to a vacuum cleaner. For example, female locator member  2688  may couple e.g. push-fit, screw onto a vacuum cleaner or may be integrated with a vacuum cleaner. Female locator member  2688  may be arranged to be coupleable to male locator member  2680 , wherein male locator member  2680  may be coupled to female locator member  2688  by, for example, rotating and releasably securing male locator member  2680  to female locator member  2688 , thereby providing a relative alignment of the fluid path and circular opening  2684   a  and circular opening  2690  and a conduit of envelope  910 .  FIG. 26 a    also shows a schematic elevation of the male locator member  2680  coupled to the female locator member  2688 , as a locator member assembly  2695 . In use, male locator member  2680  may be arranged to couple an envelope to a vacuum cleaner and or/vacuum pump. Male locator member  2680  is received by a female locator member  2688 , in which female locator member  2688  is coupled to a vacuum cleaner, in which an envelope  910  is coupled to the male locator member  2680 , as described above. Openings  2682   a  of male locator member  2680  are aligned with protrusions  2682   b  of female locator member  2688 . Male locator member  2680  may be pressed and/or pushed towards female locator member  2688  and male locator member  2680  then rotated relative to female locator member  2688 , thereby locking male locator member  2680  and female locator member  2688  and securing an envelope coupled to male locator member  2680 . A structural member  2374  may be inserted into opening  2684   a  and hence into a conduit of envelope  910  and rotated about its longitudinal axis, thereby tensioning an envelope. In use, male locator member  2680  may tear along a tear line  2684   b  while structural members  2374   a  are inserted into opening  2684   a  and hence into a conduit of envelope  910 , pushed then rotated about its longitudinal axis, thereby tensioning an envelope. Another structural member (e.g. helical structural member  1760 ) may be inserted 
     (e.g. at the same time, before or after) into opening  2690  and hence into a conduit of envelope  910  and rotated about its longitudinal axis, thereby supporting an inner tube of an envelope, as described previously. Particularly, where male locator member  2680  comprises one circular opening  2684   a , a structural member  2374   a  may be inserted, as described previously. Further, locator member assembly  2695  may comprise retracted structural members  2374  and/or circular openings  2684   a  and/or retracted helical structural member  1760  and/or circular opening  2690  in a tube, e.g. tube  1920  as described previously, comprising a mechanism to retract, store and deploy the retracted structural members. The tube  1920  would allow the structural members  2374  to rotate outwards from  2688 . 
     In more detail,  FIG. 26 b    shows a schematic exploded perspective elevation of the locator member assembly  2695  according to the example embodiment of  FIG. 26 a   . The outlet end  918  of the envelope  910  is bonded between a pair of male locator members  2680   a  and  2680   b , forming assembly  2699 , such that circular openings  2684   a  of male locator member  2680   a  and semi-circular openings  2682   a  of male locator member  2680   b  are aligned appropriately for female locator member  2688 , as described above. 
     In this way, male locator member  2680  may be manufactured and bonded in two or more parts while to a user, male locator member  2680  allows easy and consistent alignment of the conduits (e.g. a conduit of envelope  910  arranged to couple a structural member) with the structural members (e.g. structural member  2374   a ). In use, male locator member  2680  does not separate at any time except for a number of small tear off semi-circular strips along tear line  2684   b , which allows the liner  910  of the material collection chamber to spread outwards as the structural members (e.g. structural member  2374   a ) fan out whilst male locator member  2680  itself remains secured to female locator member  2688 . Female locator member  2688  may further comprise stored structural members (e.g. structural member  2374  and/or structural member  1760 ) and a mechanism to deploy and retract these structural members. 
       FIG. 27  shows a schematic elevation of a male locator member  2780  according to another example embodiment, related to the embodiment of  FIG. 26 . The male locator member  2780  may be arranged to couple an envelope to a vacuum cleaner, as described with reference to the male locator member  2680 . Male locator member  2780  comprises a ring, comprising plastic and/or cardboard, to receive an envelope and a structural member. A bore of male locator member  2780  is arranged to receive a fluidic path provided by an envelope. A circular opening  2784   a  is arranged on a locus of male locator member  2780 , wherein an opening  2784   a  is arranged to receive a structural member. Five equidistant semi-circular openings  2782   a  are arranged on an outer diameter of male locator member  2780 . A further circular opening  2790  is arranged at a radius of male locator member  2780 , to receive another structural member. 
     In use, male locator member  2780  may be arranged to couple an envelope to a vacuum cleaner. Male locator member  2780  is received by a female locator member  2788 , in which female locator member  2788  is coupled to a vacuum cleaner, in which an envelope is coupled to male locator member  2780 , as described above. Openings  2782   a  of male locator member  2780  are aligned with protrusions  2782   b  of female locator member  2788 . Male locator member  2780  may be pressed and/or pushed towards female locator member  2788  and male locator member  2780  then rotated relative to female locator member  2788 , thereby locking male locator member  2780  and female locator member  2788  and securing an envelope coupled to male locator member  2780 . A helical structural member  1760  (not shown) may be inserted into opening  2784   a  and hence into a conduit of envelope  910  and rotated about its longitudinal axis, thereby tensioning an envelope. Another helical structural member  1760  (not shown) may be inserted into opening  2790  and hence into another conduit of envelope  910  and rotated about its longitudinal axis, thereby supporting an inner tube of an envelope. Female locator member  2788  may comprise retracted helical structural members  1760  and a mechanism to deploy the retracted structural members  1760 . 
       FIG. 28  shows a schematic elevation of dispensing canister  2800  according to an example embodiment. Dispensing canister  2800  may be arranged to receive a plurality of envelopes for example 2, 3 4, 5, 6, or more envelopes, for example, an envelope  2810 . Envelope  2810  comprises a pair of fixing members, for example male locator members  2680 , arranged as described with reference to  FIG. 26 . An envelope  2810  mayor may not be releasably coupled to another envelope  2810 . Envelope  2810  comprises a conduit  2884   a ′ arranged to receive a structural member. Envelope  2810  comprises another conduit  2890 ′ arranged to receive another structural member. An envelope  2810  is rotated about a longitudinal axis of dispensing canister  2800  with respect to another envelope  2810 . For example, an envelope  2810  is rotated 60° about a longitudinal axis of dispensing canister  2800  with respect to another envelope  2810 , in which dispensing canister  2800  is arranged to receive a plurality of envelopes for example 2, 3 4, 5, 6, or more envelopes  2810 . In use, a structural member is inserted into conduit  2884   a ′ and hence into a conduit of envelope  910  and another structural member is inserted into conduit  2890 ′ and hence into another conduit of envelope  910 . After using the vacuum cleaner, the structural members are removed and the envelope  2810  sealed for disposal. Dispensing canister  2800  is rotated 60° about a longitudinal axis of dispensing canister  2800  to present another envelope  2810 . 
       FIG. 29  shows a schematic cross-sectional view of the dispensing canister of  FIG. 28 , arranged to receive a plurality of envelopes for example 2, 3 4, 5, 6, or more envelopes (not shown). 
       FIG. 30  shows a schematic cross-sectional view of an envelope  3010  according to still yet another example embodiment, comprising a tubular collection chamber  3030  and a plurality of flow diverters  3040 . The envelope  3010  is arranged to receive a structural member (not shown), such as the structural member  1760 , such that in use, a shape of envelope  3010  is maintained. The flow diverters  3040  comprise a plurality of members arranged on, and inclined to, an inner surface of the envelope  3010  to, in use, deflect a fluid into one or more regions formed between the tubular collection chamber  3030  and the flow diverters  3040 . Alternatively, the flow diverter  3040  comprises a helical member arranged on, and inclined to, an inner surface of the envelope  3010  to, in use, deflect a fluid into one or more regions formed between the tubular collection chamber  3030  and the flow diverter  3040 . In this way, the structural member may be withdrawn in use (i.e. with the vacuum cleaner operating) and the fluid deflected into the one or more regions formed between the tubular collection chamber  3030  and the flow diverters  3040  is retained. Further, an end of the envelope  3010  may be closed (e.g. tied shut) or both ends of the envelope  3010  may be closed, thereby isolating the fluid in the envelope  3010 . 
       FIG. 31  shows a method of using an envelope according to an example embodiment. At S 10 , a structural member is coupled to the envelope to support the envelope, such as in this embodiment by being received into a wall portion of the envelope. At S 20 , the envelope is coupled to a vacuum source, for example, a vacuum cleaner. At S 30 , the vacuum cleaner is used to vacuum debris whereby debris is collected in the envelope. 
     Optionally, the method further comprises uncoupling an end of the envelope, for example a fixing member, from a vacuum cleaner. Optionally, the method further comprises closing an end of the envelope. Optionally, the method further comprises removing a structural member from the envelope. Optionally, the method further comprises disposing of the envelope. 
     As set out above, envelopes and assemblies according to the example embodiments provide a removable and readily replaceable part that can inhibit dirt from passing into a vacuum cleaner. Further, the envelope may provide complete coverage of the fluid path from an inlet to an outlet and hence provide end-to-end coverage for the portions exposed to dirt when the vacuum cleaner is used. In this way, the envelope may be a barrier between wet and/or dry dirt that is vacuumed up by a vacuum cleaner. The envelope receives dirt for safe and hygienic disposal, facilitated by the ends of the envelope being sealed before the envelope is uncoupled from the vacuum cleaner. 
     The features described herein are suitable for inclusion in a vacuum cleaner at time of first manufacture, or can be retrofitted to existing vacuum cleaners in situ as appropriate. 
     Although a few preferred embodiments have been shown and described, it will be appreciated by those skilled in the art that various changes and modifications might be made without departing from the scope of the invention, as defined in any appended claims. 
     Attention is directed to all papers and documents which are filed concurrently with or previous to this specification in connection with this application and which are open to public inspection with this specification, and the contents of all such papers and documents are incorporated herein by reference. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and/or all of the steps of any method or process so disclosed, may be combined in any combination, except combinations where at least some of such features and/or steps are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Thus, unless expressly stated otherwise, each feature disclosed is one example only of a generic series of equivalent or similar features. 
     The invention is not restricted to the details of the foregoing embodiment(s). The invention extends to any novel one, or any novel combination, of the features disclosed in this specification (including any accompanying claims, abstract and drawings), or to any novel one, or any novel combination, of the steps of any method or process so disclosed.