Surface cleaning apparatus

Abstract

A surface cleaning apparatus has a dirt collection chamber that is external to a cyclone chamber. The dirt collection chamber has a sidewall having a first sidewall portion that extends outwardly away from the cyclone chamber sidewall and a second sidewall portion that extends from the first sidewall portion towards a distal end of the dirt collection chamber. The cyclone chamber has a dirt outlet that faces the cyclone chamber sidewall.

Claims

1. A surface cleaning apparatus comprising: (a) a cyclone chamber having a longitudinal axis defining a longitudinal direction, a first end having a first end wall, a longitudinally spaced apart second end having a second opposed end wall, a cyclone chamber sidewall extending between the first and second end walls, a cyclone air inlet, a cyclone air outlet and a dirt outlet, wherein, at a location of the dirt outlet, the cyclone chamber has a cyclone chamber width in a direction transverse to the longitudinal axis; (b) a dirt collection chamber having a first end wall positioned proximate the second opposed end wall of the cyclone chamber, a second opposed end wall that is longitudinally spaced apart from the first end wall of the dirt collection chamber and a dirt collection chamber sidewall; and, (c) a suction motor in fluid communication with the cyclone chamber, wherein the dirt collection chamber sidewall has a first sidewall portion and a second sidewall portion, wherein the cyclone chamber sidewall has a first location and an axially spaced apart second location and the first sidewall portion extends outwardly from the first location on the cyclone chamber sidewall to a distal end of the first sidewall portion, the distal end is spaced radially outwardly from the second location of the cyclone chamber sidewall, wherein the second sidewall portion extends from the distal end towards the second opposed end wall of the dirt collection chamber, wherein a plane that is transverse to the longitudinal axis extends through the dirt outlet and the second sidewall portion, and wherein the second sidewall portion has a width in a direction transverse to the longitudinal axis that is greater than the width of the cyclone chamber.

2. The surface cleaning apparatus of claim 1 wherein the distal end of the first sidewall portion is positioned between the first end wall of the cyclone chamber and the dirt outlet.

3. The surface cleaning apparatus of claim 1 wherein the second sidewall portion extends longitudinally.

4. The surface cleaning apparatus of claim 1 wherein the dirt outlet comprises a gap provided between the cyclone chamber sidewall and the second opposed end wall of the cyclone chamber.

5. The surface cleaning apparatus of claim 4 wherein the dirt outlet comprises a slot.

6. The surface cleaning apparatus of claim 5 wherein the slot extends part way around the cyclone chamber sidewall.

7. The surface cleaning apparatus of claim 1 wherein the dirt outlet comprises a gap provided between the cyclone chamber sidewall and the second opposed end wall of the cyclone chamber.

8. The surface cleaning apparatus of claim 7 wherein the dirt outlet comprises a slot.

9. The surface cleaning apparatus of claim 8 wherein the slot extends part way around the cyclone chamber sidewall.

10. The surface cleaning apparatus of claim 1 wherein the dirt collection chamber extends longitudinally away from the cyclone chamber.

11. The surface cleaning apparatus of claim 1 wherein the longitudinal axis extends through the dirt collection chamber.

12. The surface cleaning apparatus of claim 1 wherein, when the surface cleaning apparatus is positioned on a horizontal surface, the first end wall of the cyclone chamber is located above the second opposed end wall of the cyclone chamber and the dirt collection chamber is positioned below the cyclone chamber.

13. The surface cleaning apparatus of claim 1 wherein the cyclone air inlet and the cyclone air outlet are located at the first end of the cyclone chamber.

14. The surface cleaning apparatus of claim 13 wherein the dirt outlet is located at the second end of the cyclone chamber.

15. The surface cleaning apparatus of claim 14 wherein the dirt outlet faces the second sidewall portion.

16. The surface cleaning apparatus of claim 15 wherein the second sidewall portion extends longitudinally.

17. The surface cleaning apparatus of claim 14 wherein the longitudinal axis extends through the dirt collection chamber.

18. The surface cleaning apparatus of claim 15 wherein the longitudinal axis extends through the dirt collection chamber.

19. The surface cleaning apparatus of claim 14 wherein the distal end of the first sidewall portion is positioned between the first end wall of the cyclone chamber and the dirt outlet.

20. A surface cleaning apparatus comprising: (a) a cyclone chamber having a longitudinal axis defining a longitudinal direction, a first end having a first end wall, a longitudinally spaced apart second end having a second opposed end wall, a cyclone chamber sidewall, a cyclone air inlet, a cyclone air outlet and a dirt outlet, wherein, at a location of the dirt outlet, the cyclone chamber has a cyclone chamber width in a direction transverse to the longitudinal axis; (b) a dirt collection chamber having a first end wall positioned proximate the second opposed end wall of the cyclone chamber, a second opposed end wall that is longitudinally spaced apart from the first end wall of the dirt collection chamber and a dirt collection chamber sidewall; and, (c) a suction motor in fluid communication with the cyclone chamber, wherein the dirt collection chamber sidewall has a first sidewall portion and a second sidewall portion, wherein the first sidewall portion extends outwardly from a first portion of the cyclone chamber sidewall that is located between first and second opposed ends of the cyclone chamber sidewall, the first sidewall portion has a distal end that is spaced outwardly from a second portion of the cyclone chamber sidewall that is axially spaced from the first portion of the cyclone chamber sidewall, wherein the second sidewall portion extends from the distal end towards the second opposed end wall of the dirt collection chamber, wherein the dirt outlet faces towards the dirt collection chamber sidewall, and wherein the second sidewall portion has a width in a direction transverse to the longitudinal axis that is greater than the width of the cyclone chamber, and wherein a plane that is transverse to the longitudinal axis extends through the distal end of the first sidewall portion and the cyclone chamber sidewall.

Description

DRAWINGS

(1) Reference is made in the detailed description to the accompanying drawings, in which:

(2) FIG. 1 is a perspective view of an embodiment of a surface cleaning apparatus;

(3) FIG. 2 is a perspective view of a cyclone bin assembly useable with the surface cleaning apparatus of FIG. 1;

(4) FIG. 3 is a section view of the cyclone bin assembly of FIG. 2, taken along line 3-3 in FIG. 2 with part of the mesh removed;

(5) FIG. 4 is a top perspective view of the cyclone bin assembly of FIG. 2, with its lid open;

(6) FIG. 5 is the perspective view of FIG. 4, with the screen removed and with the mesh removed;

(7) FIG. 6 is the perspective view of the cyclone bin assembly of FIG. 2, with an alternate screen removed;

(8) FIG. 7 is a section view of the cyclone bin assembly of FIG. 6, taken along line 7-7 in FIG. 6 with the mesh removed from the screen;

(9) FIG. 8 is a perspective view of an alternate screen with the mesh removed from the screen;

(10) FIG. 9 is a perspective view of another side of the screen of FIG. 8 with the mesh removed from the screen;

(11) FIG. 10 is a perspective view of a further alternate screen with the mesh removed from the screen;

(12) FIG. 11 is a section view of the cyclone bin assembly of FIG. 6, taken along line 7-7 in FIG. 6 and incorporating the screen of FIG. 10;

(13) FIG. 12 is a perspective view of a further alternate screen with the mesh removed from the screen;

(14) FIG. 13 is a section view of the cyclone bin assembly of FIG. 6, taken along line 7-7 in FIG. 6 and incorporating the screen of FIG. 12;

(15) FIG. 14 is a perspective view of a further alternate screen with the mesh removed from the screen;

(16) FIG. 15 is a section view of the cyclone bin assembly of FIG. 6, taken along line 7-7 in FIG. 6 and incorporating the screen of FIG. 14;

(17) FIG. 16 is a perspective view of a further alternate screen with the mesh removed from the screen;

(18) FIG. 17 is a section view of the cyclone bin assembly of FIG. 6, taken along line 7-7 in FIG. 6 and incorporating the screen of FIG. 16;

(19) FIG. 18 is a perspective view of a further alternate screen with the mesh removed from the screen; and,

(20) FIG. 19 is a section view of the cyclone bin assembly of FIG. 6, taken along line 7-7 in FIG. 6 and incorporating the screen of FIG. 18.

DETAILED DESCRIPTION

(21) Referring to FIG. 1, an embodiment of a surface cleaning apparatus 100 is shown. In the embodiment illustrated, the surface cleaning apparatus 100 is a full size upright vacuum cleaner. In alternate embodiments, the surface cleaning apparatus may be another suitable type of surface cleaning apparatus, including, for example, a hand vacuum cleaner, a canister vacuum cleaner, a stick vac, a wet-dry vacuum cleaner and a carpet extractor.

(22) The surface cleaning apparatus 100 may comprise an electrical cord to connect to an external power source, including, for example, a standard electrical outlet. Alternatively, or in addition to being connectable to an external power source, the surface cleaning apparatus 100 may comprise an onboard power source, including, for example one or more batteries. Optionally, the on board battery may be rechargeable, preferably while mounted to the surface cleaning apparatus 100.

(23) As exemplified in FIG. 1, the surface cleaning apparatus 100 includes a surface cleaning head 102 and an upper section 104. The surface cleaning head 102 preferably includes a pair of rear wheels 106 and a pair of front wheels (not shown) for rolling across a surface and a dirty air inlet 108 towards the front. The upper section 104 is moveably connected to the surface cleaning head 102 (e.g., pivotally mounted) between an upright storage position and an inclined in use position. It will be appreciated that the cleaning head and upright section may be of any design known in the art.

(24) An air flow passage extends from the dirty air inlet 108 to a clean air outlet 110, which is preferably provided on the upper section 104. A handle 116, which is preferably connected to the upper section 104, is provided for manipulating the surface cleaning apparatus 100.

(25) Preferably, as exemplified, the upper section 104 comprises an air treatment housing 112 and a suction motor housing 114. The air treatment housing 112 houses an air treatment member, which is positioned in the air flow passage downstream from the dirty air inlet 108, to remove dirt particles and other debris from the air flowing through the air flow passage. In the illustrated example, the air treatment member comprises a cyclone bin assembly 118 comprising a cyclone chamber 120 and a dirt collection chamber 122. The air treatment member may also comprise one or other air treatment members such as one or more cyclones or filters

(26) The suction motor housing 114 is configured to house a suction motor (not shown). Preferably, as exemplified, the suction motor is in air flow communication with the air flow passage, downstream from the cyclone bin assembly 118. Air exiting the cyclone bin assembly 118 may flow into a suction motor and exit the surface cleaning apparatus via the clean air outlet 110. The suction motor is preferably provided below the cyclone air outlet.

(27) As exemplified in FIGS. 2-5, the cyclone bin assembly 118 comprises a cyclonic chamber 120 and a separate dirt collection chamber 122 exterior to the cyclone chamber. The cyclone chamber and the dirt collection chamber may be of any configuration and may be in any orientation.

(28) Air circulating within the cyclone chamber 120 enters via a cyclone or tangential air inlet 130 (which has an inlet end 130a and an outlet end 130b) and exits via a cyclone air outlet. As exemplified, cyclone chamber 120 is an upright cyclone chamber (e.g., the air enters and exits at the upper end of the cyclone chamber and the separated dirt exits at the lower end). In an alternate embodiment, the cyclone may be an inverted cyclone chamber (e.g., the air enters and exits at the lower end of the cyclone chamber and the separated dirt exits at the upper end). It will be appreciated that the air inlets and air outlets may be of various known designs.

(29) As exemplified, the cyclone chamber 120 comprises a sidewall 124, a first (e.g., upper) end wall 126, an opposed second (lower) end wall or floor 128 and a longitudinal axis 138. A tangential or cyclone air inlet 130, in air flow communication with the dirty air inlet 108, is provided, preferably in the sidewall 124 for receiving a particle laden fluid stream, represented by arrow 132. As the fluid stream 132 circulates within the cyclone chamber 120, dirt particles and other debris may be disentrained from the fluid stream 132. Dirt particles and other debris separated from the fluid stream 132 may exit the cyclone chamber 120 through a dirt outlet 134, and are collected in the dirt collection chamber 122. The cyclone chamber 120 is exemplified in an upright configuration (e.g., e.g., the cyclone axis 138 extends generally vertically). However, it will be appreciated that the cyclone chamber may be provided in various orientations.

(30) Preferably, the dirt outlet 134 comprises a gap provided between the sidewall 124 of the cyclone chamber 120 and the second (lower) end wall 128. The gap may extend part way or all the way around sidewall 124. Preferably, as exemplified, the dirt outlet comprises a slot 136 that extends part way around sidewall 122 between the end of sidewall 124 facing second end wall 128 and the second end wall 128. Debris separated from the air flow in the cyclone chamber 120 may travel from the cyclone chamber 120, through the dirt outlet 158 to the dirt collection chamber 122. Alternately, for example, the dirt outlet may be an opening in the second end wall or floor 128 and a plate may be provided at or facing the opening.

(31) As exemplified, the dirt collection chamber 122 is separate from and positioned below the cyclone chamber 120. It will be appreciated that, in alternate designs, the dirt collection chamber may be internal to the cyclone chamber (e.g., it may comprise the bottom section of a cyclone chamber) or it may be positioned beside the cyclone chamber.

(32) As exemplified, the dirt collection chamber 122 comprises a sidewall 140, a first end wall 144 and an opposed second end wall or floor 144. The dirt collection chamber may be emptyable by any means known in the art. For example an end wall may be openable (e.g., moveable to an open position or removably mounted). Preferably, the floor 144 is pivotally connected to the dirt collection chamber 122, such as by hinges 146, and may be rotated between a closed position (FIG. 2) and an open position (not shown). The floor 144 can be held in the closed position by any means known in the art, such as a releasable latch 148, or other suitable closure mechanism.

(33) The cyclone chamber may be openable concurrently with the dirt collection chamber. As exemplified, the floor 128 of the cyclone chamber may be movable with the floor of the dirt collection chamber 144 to allow dirt retained in the cyclone chamber 120 to be emptied when the dirt collection chamber 122 is opened. In the illustrated example, the floor 128 of the cyclone chamber 120 is supported above the floor 144 of the dirt collection chamber 122 on a support member 150.

(34) As exemplified in FIG. 5, the cyclone air outlet comprises an opening 152 in the first end wall 126 of cyclone chamber 160 which has a thickness 160. Screen 168 is positioned to cover opening 152. Opening 152 is in airflow communication with, preferably, a pair of external outlet down ducts 154. In the illustrated example, the passage 152 and down ducts 154 are in airflow communication by an air outlet chamber or plenum 156 that is located between the first end wall 126 of the cyclone chamber 120 and the inner surface 190 of the lid 158. The downstream ends of the down ducts 154 are in fluid communication with the suction motor. It will be appreciated that the passage from the cyclone outlet to the clean air outlet may be of various configurations and may include one or more filters as is known in the art.

(35) In one aspect of this disclosure, the cyclone air outlet has an absence of a vortex finder. Accordingly, the cyclone air outlet is defined by opening 152 in the first end wall 126 that is covered by screen 168. Preferably, as exemplified, the screen 168 has an interior volume 192 that is fully open. As such, the screen does not have a conduit or other structure that extends from end wall 126 downwardly into interior volume 192 of screen 168. Air with enters the interior volume 192 may flow unimpeded through opening 152.

(36) Referring to FIGS. 3 and 5, the opening 152 defines a passage 164 that has a passage height 160, measured parallel to the cyclone chamber axis 138. Conventional cyclone chamber designs include a generally elongate outlet passage that may extend into the interior of the cyclone chamber to a position substantially below the lower extent of the cyclone air inlet. Such air outlet passages have a solid, fluid impermeable wall, and are commonly referred to as vortex finders.

(37) In accordance with another aspect of this disclosure, unlike conventional cyclone chamber designs, the height 160 of the air outlet passage 164 may be selected so that the walls of the outlet passage 164 do not substantially extend into the interior of the cyclone chamber 120. Preferably, the height 160 of outlet passage 164 may be selected to be less than the height 162 of the cyclone air inlet 130 and is preferably less than half the height 162 and more preferably less than a third of the height. As such, if a conduit extends into the screen 168 to define a longer passage 164, it may comprise a collar depending downwardly from inner surface 166 of first end wall 126.

(38) More preferably, a collar is not provided so that outlet passage 164 does not extend beyond the inner surface 166 of the first end wall 126 (i.e., it does not extend into the interior volume 192 of screen 168). In the illustrated example, the height 160 is less than height 162, and is generally equal to the thickness 168 of the end wall 126. Reducing the height 160 of the outlet passage 164 may help reduce energy losses as air exits the cyclone chamber 120, which may help increase the efficiency of the surface cleaning apparatus 100.

(39) The screen 168 may help prevent elongate material such as hair and larger dirt particles from exiting the cyclone chamber 120 via the opening 152. Screen 168 may be a shroud (e.g., a molded plastic member having a plurality of openings or perforations therein. Alternately, screen 168 may comprise a mesh material. The mesh material may be self-supporting (e.g., a metal mesh). If the mesh material is not self-supporting, then a frame may be provided. Any screen known in the art may be used.

(40) It has been discovered that for example, that for certain air flows, having certain flow properties, the fluid permeable screen 168 can be used in place of a traditional, non-permeable vortex finder to help facilitate the cyclonic air flow pattern within the cyclone chamber 120. For example, it has been discovered that if the surface cleaning apparatus 100 operates with a given combination of operating power and air flow rate, positioning the screen 168 within the cyclone chamber 120 may be sufficient to facilitate cyclonic flow of the air, without passing directly to exit the cyclone chamber 120 via the outlet passage 152 and therefore bypassing the cyclonic cleaning stage.

(41) For example, the use of a screen 168, as opposed to a traditional non-permeable vortex finder, is sufficient to facilitate operation of the surface cleaning apparatus 110 when the surface cleaning apparatus 100 produces approximately 50 air watts of power (or less), preferably 40 air watts of power or less and optionally 30 air watts of power or less and/or operates an air flow rate of approximately 1.3 cubic meters per minute or less, preferably 1.2 cubic meters per minute or less and optionally 1.1 cubic meters per minute or less. The suction motor used in such a surface cleaning apparatus 100 may have a power requirement of 500 watts or less, and preferably has a power requirement of less than 200 watts.

(42) As exemplified, screen 168 comprises on or more fluid permeable regions 170 that are covered with a fluid permeable material 180 (e.g., a mesh material) extending between non-permeable frame members 172. The permeable material 180 comprises a plurality of openings 182 to allow air to flow therethrough and may be a synthetic material (e.g., plastic). The permeability of the fluid permeable regions, and the corresponding flow resistance of the screen 168, may be varied by varying the properties of the permeable material 180, including, for example the size and/or shape of the openings 182. For example, the openings 182 can be configured to have a diameter or maximum height that is less than 8 mm in size, preferably less than 6 mm, more preferably less than 4 mm and may be less than 2 mm.

(43) Preferably, the screen 168 has a height 186 that is greater than the height 162 of the outlet 130b of the air inlet 130. Optionally, the screen 168 can be configured so that the height 186 is between about 0.5 and 4 times larger than height 162. Preferably, the height 186 is between about 1 and about 3 times the height 162 of the outlet 130b of the air inlet 130, and more preferably is about 2 times the height 162 of the outlet 130b of the air inlet 130.

(44) Referring to the screen exemplified in FIGS. 8 and 9, screen 168 is positioned in the cyclone chamber 120 upstream of the cyclone air outlet. Screen 168 has an outlet end 194 and a distal end 196 spaced from and facing the outlet end 194. The outlet end of the screen is open and defines an airflow passage which is at least the same size as an airflow passage defined by the opening 152. For example, if the screen 168 and the outlet 152 are circular, then open end 194 may have a diameter proximate the diameter of opening 152. Therefore, the outlet end 194 of the screen 168 may be positioned adjacent the end wall 126.

(45) Preferably, screen 168 comprises a solid wall 198 that faces the outlet 130b of cyclone air inlet 130. Solid wall 198 may assist in preventing air bypassing cyclone chamber 120 by travelling directly to opening 152 and may assist in creating cyclonic flow in cyclone chamber 120 by defining an annular air flow passage at the upper end of cyclone chamber 120. Preferably, the solid wall 198 has a height 200 that is greater than the height 162 of the outlet 130b of cyclone air inlet 130.

(46) In some embodiments, solid wall 198 may have a uniform height (see for example FIGS. 6, 7 and 12-19. In such cases, the height 200 of solid wall is preferable greater than the height of outlet 130b of cyclone air inlet 130. In some embodiments, solid wall 198 may extend all the way around screen 198 (see for example FIGS. 6, 7 and 16-19). In other cases, solid wall may extend only part way around screen 168 (see for example FIGS. 12-15).

(47) In other cases, (see for example FIGS. 8-11) the height 200 of the solid wall may be variable and preferably decreases in the direction of rotation 202 of the air in cyclone chamber 120. In such a case, the height 200 of the portion of solid wall 198 facing outlet 130b of cyclone air inlet 130 is preferable greater than the height of outlet 130b of cyclone air inlet 130. For example, the height 200 of upstream end 206 of solid wall 198 is preferable greater than the height of outlet 130b of cyclone air inlet 130. As the air rotates in direction 202 in cyclone chamber 120, the air will move downwardly towards lower end 128 of cyclone chamber 120. Accordingly, the height of the solid wall 198 may decrease as there may not be cyclonic flow around a portion of the upper end of screen 168. For example, at a position about of of the distance around screen 168 from outlet 130b, there may be no cyclonic flow around the upper portion of screen 168. Accordingly, solid wall 198 is not required to prevent bypass of cyclone chamber 120. Preferably, the air rotating in the direction 202 adjacent the screen has a height and the height 200 of the solid wall is greater than the height of the air. As exemplified in FIGS. 8 and 9, the height 200 of solid wall 168 decreases to 0 or essentially 0 at a position 208 which is about of the distance around screen 168 from outlet 130b. An advantage of this design is that mesh 180 may be provided in an region that would otherwise be occupied by solid wall 198, thereby increasing the mesh surface area and therefore increasing the surface area available for air to mass through to opening 198.

(48) Accordingly, solid wall 198 may have a distal end 204 that is spaced from end wall 126 of the cyclone chamber 120 by a first distance or height 200 and the outlet 130b of the cyclone air inlet 130 may have a distal end 210 spaced from an end wall of the cyclone chamber 126 by a second distance or height 162 and the first distance is greater than the second distance.

(49) The distal end 196 of screen 168 may be closed (e.g., a solid surface) but it is preferably open (e.g., covered by mesh 180).

(50) Optionally, the lid 158 of the cyclone bin assembly 118 is openable to allow a user to remove the screen 168. In the illustrated example, the lid 158 is hinged and can pivot open to allow access to the removable of the screen 168. Alternatively, the lid 158 can be detachable or openable by any other means.

(51) If screen 168 is removable and if solid wall 198 does not extend all around screen 168 or if it only has a portion with a height 200 greater than the height 162 of outlet 130b, then one or more alignment members may be provided to assist a user to reinsert screen in the correct orientation (e.g., with the portion of screen 168 that has a height 200 greater than the height 162 of outlet 130b facing outlet 130b). For example, as exemplified in FIGS. 16-19, alignment notches 212 may be provided in rim 174 of screen 168. These alignment notches 212 may mate with protrusions provided on the outer surface of end wall 126 on which rim 174 seats. In a particularly preferred embodiment, the notches 212 may be angularly spaced so that screen 168 may only be reinserted in the correct position. Any other alignment means or inter-engagement members may be sued.

(52) Screen 168 may be of various shapes. In the illustrated example, outlet 152 and the screen 168 have generally round cross sectional shapes, and the screen 168 is received in the outlet 152. Optionally, the screen 168 may be configured to have a cylindrical shape (see FIGS. 4-11 and 14-17), a lower portion that is generally frusto-conical in shape (see FIGS. 12, 13, 18 and 19) or any other suitable shape.

(53) The screen 168 may comprise an annular rim 174. When screen 168 is positioned in cyclone chamber 120, the rim 174 may be positioned above, and preferably rests on the upper wall 126 such that the screen 168 is suspended from the rim 174. A gasket 175 or other sealing member may be provided between the rim 174 and the upper wall 126 to help seal the rim 174 against the upper wall 126.

(54) Optionally, if the screen 168 is removable, a member to secure the screen in portion may be provided. For example, as exemplified, the lid 158 may include one or more engagement member that can secure the screen 168 in position when the lid 158 is closed. In the illustrated example, the engagement member comprises four securing legs 176 extending from the inner surface 190 of lid 158. When the lid 158 is closed, the securing legs 176 rest on the rim 174 and press the rim 174 against the upper wall 126. Providing securing legs 176 to hold the rim 174 in place may eliminate the need to use additional fasteners or attachment members to hold the screen 168 in position. The legs 176 are preferably spaced apart from each other around the perimeter of the rim 174. Spacing the legs 176 apart from each other may help to provide a distributed holding force and may help facilitate airflow between the legs 176, from the outlet passage 152 to the outlet conduits 154. Optionally, a different number of legs 176, other type of holding structure, including for example a bayonet mount, male and female engagement members provided on screen 168 and end wall 126, or other type of fastening members can be used to hold the screen 168 in place.

(55) In the illustrated example, the screen 168 may be received in the outlet 152 in a plurality of rotational alignment positions, and need not be oriented in a predetermined direction or alignment relative to the upper wall 126 of the cyclone chamber 120.

(56) Optionally, some or all of the upper wall 126 of the cyclone chamber 120 may be removable with the screen 168. Removing a portion of the upper wall 126 may allow a user to access the interior of the cyclone chamber 120. Optionally, the removable portion of the upper wall 126 may be an annular band 178 that surrounds the outlet 152. Removing some or all of the upper wall 126 while the floors 128 and 144 are open may allow simultaneous access to both ends of the cyclone bin assembly 118, which may help a user to clean the interior of the cyclone bin assembly 118.

(57) What has been described above has been intended to be illustrative of the invention and non-limiting and it will be understood by persons skilled in the art that other variants and modifications may be made without departing from the scope of the invention as defined in the claims appended hereto.