SUCTION NOZZLE

Abstract

A suction nozzle includes a casing which defines a suction chamber, and an agitator rotatably mounted within the suction chamber. The agitator is supported in the suction chamber by a support member. A drive assembly arranged to rotate the agitator about an axis is mounted to the casing via the support member, and is mounted to the support member via a first soft mounting member. The support member is mounted to the casing via a second soft mounting member.

Claims

1. A suction nozzle comprising a casing which defines a suction chamber, and an agitator rotatably mounted within the suction chamber, wherein: the agitator is supported in the suction chamber by a support member; a drive assembly arranged to rotate the agitator about an axis is mounted to the casing via the support member, and is mounted to the support member via a first soft mounting member; and the support member is mounted to the casing via a second soft mounting member.

2. The suction nozzle of claim 1, wherein the first or second soft mounting member comprises an elastomeric component.

3. The suction nozzle of claim 2, wherein said elastomeric component is positioned to act as an air seal.

4. The suction nozzle of claim 1, wherein the drive assembly comprises an electric motor.

5. The suction nozzle of claim 3, wherein the drive assembly comprises an electric motor and the electric motor is at least partially received inside the agitator.

6. The suction nozzle of claim 1, wherein the drive assembly is at least partially received inside the agitator.

7. The suction nozzle of claim 1, wherein the drive assembly comprises a gearbox.

8. The suction nozzle of claim 7, wherein the gearbox is an epicyclic gearbox.

9. The suction nozzle of claim 8, wherein a sun gear and a carrier of at least one planet gear of the epicyclic gearbox supportably engage one another.

10. The suction nozzle of claim 7, wherein a carrier of the gearbox is supported by a further soft mounting member.

11. The suction nozzle of claim 7, wherein the gearbox is mounted to the support member via a motor, and is mounted to the motor via a third soft mounting member.

12. The suction nozzle of claim 1, wherein the agitator is removable from the suction nozzle.

13. The suction nozzle of claim 1, wherein the drive assembly projects in cantilevered fashion from a portion of the casing to which the support member is mounted.

14. The suction nozzle of claim 1, wherein the support member engages the agitator such that substantially no relative translation therebetween can occur.

15. A vacuum cleaner comprising the suction nozzle of claim 1, a dirt separator, and a vacuum motor configured to draw air into the suction chamber of the suction nozzle and then into the dirt separator.

Description

BRIEF DESCRIPTION OF THE FIGURES

[0095] An embodiment of the present invention will now be described, by way of example only, with reference to the accompanying drawings in which:

[0096] FIG. 1 is a perspective view of a vacuum cleaner according to an embodiment of the invention;

[0097] FIG. 2 is a perspective view of a cleaner head of the vacuum cleaner of FIG. 1;

[0098] FIG. 3 is a perspective view of the cleaner head of FIG. 2, from underneath;

[0099] FIG. 4 is a cut-away view of the cleaner head of FIGS. 2 and 3, viewed generally from the front;

[0100] FIG. 5 is a cut-away view of the cleaner head, viewed generally from the top; and

[0101] FIGS. 6-13 illustrate various aspects of the cleaner head of FIG. 2, according to various embodiments.

DETAILED DESCRIPTION OF THE DISCLOSURE

[0102] Throughout the description and drawings, corresponding reference numerals denote corresponding features.

[0103] FIG. 1 shows a vacuum cleaner 2 according to an embodiment of the invention. The vacuum cleaner 2 of this embodiment is an upright vacuum cleaner. It has a rolling assembly 4 which carries a suction nozzle 6 in the form of a cleaner head, and an upright body 8. The upright body 8 can be reclined relative to the suction nozzle 6, and includes a handle 10 for maneuvering the vacuum cleaner 2 across the floor. In use, a user grasps the handle 10 and reclines the upright body 8 until the handle 10 is disposed at a convenient height. The user can then roll the vacuum cleaner 2 across the floor using the handle 10 in order to pass the suction nozzle 6 over the floor and pick up dust and debris therefrom. The dust and debris is drawn into the suction nozzle 6 by a suction generator in the form of a vacuum motor (not visible) housed on board the vacuum cleaner 2, and is ducted in conventional manner under the fan-generated suction pressure from an outlet duct 12 of the suction nozzle 6 to a cyclonic separating apparatus 14 where dirt is separated from the air. The relatively clean air is then exhausted back to the atmosphere.

[0104] The suction nozzle 6 is shown in isolation in FIGS. 2 and 3. It has a casing 16 made up of an upper casing 16a, lower casing 16b, front casing 16c, rear casing 16d and two end walls 16e, 16f. The upper and lower casings 16a, 16b and the end walls 16e, 16f of the casing 16 co-operatively define a suction chamber 18 which is in fluid communication with the outlet duct 12. The lower casing 16b and end walls 16e, 16f of the casing 16 co-operatively define a sole plate 20 which has a set of wheels 21 and a suction opening 22. An agitator 24 in form of brush bar is positioned inside the suction chamber 18. The brush bar 24 defines a longitudinal axis 26 is rotatable about its longitudinal axis within the suction chamber 18. The brush bar 24 comprises two generally helical arrays of bristles (not shown), each of which is received by and projects from a generally helical groove 27 in the agitator.

[0105] The suction nozzle has a pair of large debris slots 28 in the sole plate 20, and a pair of bleeds 30 which run through the front casing. The large debris slots 28 and bleeds 30 can be opened and closed by a slidable switch 32 provided on the front casing 16c, but the function and structure of these components is not material to the present invention and therefore will not be described in detail.

[0106] In use, a user passes the suction nozzle 6 across a surface to be cleaned. The sole plate 20 engages the surface and air is sucked into the suction chamber 18 through the suction opening 22. The air is then drawn out of the suction chamber 18 and into the rolling assembly 4 through the outlet duct 12. When the suction nozzle 6 is resting on a hard surface such as a laminate floor, the suction nozzle 6 is supported by the wheels 21. However, when the suction nozzle 6 is resting on a carpeted surface, the wheels 21 sink into the pile of the carpet and the suction opening 22 is therefore positioned further down. This allows carpet fibres to protrude through the suction opening 22, whereupon they are disturbed by the rotating agitator 24 so as to loosen dirt and dust therefrom. The mechanism by which the agitator 24 is driven will now be described, with reference to FIGS. 4-11 in combination with FIGS. 1-3.

[0107] The agitator 24 has a substantially tubular part 24a in which the grooves 27 are provided, and a closed end part 24b. A drive assembly 33 arranged to rotate the agitator about the axis 26 is received entirely within the agitator 24. The drive assembly 33 comprises an electric motor 34 which is positioned approximately centrally between the two lateral sides (i.e. sidewalls 16e, 16f) of the suction nozzle, fully within the tubular part 24a or the agitator 24. The motor 34 is of conventional design and therefore will not be described in detail. The drive assembly further comprises a gearbox 36 through which the motor 34 drives the agitator. The gearbox 36 takes the form of an epicyclic gear train which comprises a sun gear 38, three planet gears 40 mounted on a carrier 42, and a ring gear 44. The gearbox 36 is mounted to the support member 72 via the motor 34. The gearbox 36 is mounted to the motor by virtue of the ring gear 44 being mounted to a casing 46 of the motor 34 by a gear adaptor 48. The ring gear 40 is mounted to the gear adaptor 48 via a cover 68, and the gear adaptor 48 is mounted to the casing 46 of the motor.

[0108] The sun gear 38 is fixedly mounted on an output shaft 50 of the motor 34. The carrier 42 is fixedly mounted to a drive dog 54. The drive dog 54 has an external array 56 of teeth which mesh with an internal array of complementary teeth provided on the agitator 24. Accordingly, when the motor 34 is energised, the output shaft 50 and thus the sun gear 38 rotates and the ring gear 44 remains stationary. The planet gears 40 orbit the sun gear 38 and therefore the carrier 42, and thus the drive dog 54 and agitator 24, rotate as well. The gearbox 36 gears down the drive from the motor 34 so that the agitator 24 rotates at a lower speed, but under higher torque, than the output shaft 50 of the motor.

[0109] It is noteworthy that the sun gear 38 and carrier 42 supportably engage one another. More specifically, the output shaft 50 extends through the sun gear 38 and forms a projection 51 thereof which is received within the planet carrier 42. A plain bearing 52 engages the projection 51 and the planet carrier 42, reducing friction therebetween (as the projection rotates inside the planet carrier).

[0110] The gear adaptor 48 extends circumferentially around the motor 34 and ring gear 40, and has a circumferentially-spaced set of arms 60 with gaps 62 therebetween. The gaps 62 extend radially inwards through the gear adaptor and terminate at positions axially aligned with breather holes 64 in the front of the casing 46 of the motor 34. An o-ring 66 is positioned between the gear adaptor 48 and the casing 46 of the motor 34. The axial end of the ring gear 44 opposite to the motor 34 is positioned inside a cover 68. Like the gear adaptor 48, the cover 68 extends circumferentially around the ring gear 44. These features of the gear adaptor 48 and cover 68 are more clearly visible in FIGS. 4-6 and 9.

[0111] The drive assembly 33 is mounted to the casing 16 via a support member 72, and is mounted to the support member 72 by a first soft mounting member 76. More particularly, the motor 34 of the drive assembly 33 is mounted to a motor adaptor 74 which is mounted to the first soft mounting member 76, and the first soft mounting member 76 is mounted to the support member 72. The support member 72 is attached to the casing 16 via a second soft mounting member 82. More particularly, the support member 72 is mounted to a mounting member 78 via a sealing member 80, and the mounting member 78 is attached to the end wall 16e of the casing 16 via the second soft mounting member 82. In this embodiment, the first soft mounting member 76 and the second soft mounting member 82 each take the form of an elastomeric component.

[0112] The drive assembly 33 projects from end wall 16e (the portion of the casing to which the support member 72 is mounted) in cantilevered fashion. In other words, the drive assembly is not supported at the end of the drive assembly opposite to the end mounted on the end wall 16e by the mounting member 72. The drive assembly, more specifically the drive dog 54 of the drive assembly, engages the agitator 24 at the opposite lateral end of the suction nozzle 6 (i.e. the end on which end wall 16f is provided).

[0113] It is noteworthy that the cover 68 is made of elastomeric material, and forms a third soft mounting member. The cover 68 permits relative movement of the ring gear 40 and the motor 34, thereby acting to deaden the propagation of vibration therebetween and accommodating any slight misalignment between the ring gear 40 and the motor 34 (more particularly the output shaft 50 of the motor).

[0114] The motor adaptor 74 is generally cup-shaped, with its open end abutting the casing 46 of the motor 34 so that inside space 84 of the motor adaptor 74 is in communication with breather holes 86 in the rear of the casing 46 of the motor 34. The closed end of the motor adaptor 74 has an aperture 88 in communication with the inside space 84.

[0115] The support member 72 is generally cylindrical, and has a hollow interior which defines an inflow chamber 90, an outflow chamber 92 and a wiring chamber 94. Each of these chambers 90, 92, 94 is open at each axial end of the support member 72. The support member 72 also has a radial aperture 96 in fluid communication with the inflow chamber 90. As discussed below, the support member 72 also supports the agitator 24 in the suction chamber 18.

[0116] The mounting member 78 and second soft mounting member 82 co-operatively define a generally L-shaped channel 98 with a generally radially-extending arm 100 and a generally longitudinally-extending arm 102. Arm 100 has an axially-facing aperture 101 therein. Arm 102 is positioned within a duct 104 defined in the lower casing 16b. The duct 104 runs generally axially and terminates at the outlet 12. The mounting member 78 and second soft mounting member 82 also define an inlet chamber 106 which is separate to the L-shaped channel 98, and which is positioned in fluid communication with a vent 108 in end wall 16e. The mounting member 78 and second soft mounting member 82 also define an aperture 110 in fluid communication with the inlet chamber 106.

[0117] The wiring chamber 94 of the support member 72 is closed (in this case sealed) at one end by first soft mounting member 76, and at its other end by sealing member 80. The wiring chamber 94 is therefore air-tight. Wiring 112 for transmitting electrical power to the motor 34 runs through a wiring chamber 94 of the support member 72, and through a ferrite toroid 114 for suppressing electrical noise that is also positioned inside the wiring chamber.

[0118] The inflow chamber 90 of the support member 72 is sealed closed at one end by first soft mounting member 76, but at its other end is sealed against the aperture 110 in the mounting member 78 and second soft mounting member 82. The inflow chamber 90 is therefore in fluid communication with the inlet chamber 106.

[0119] One end of the outflow chamber 92 is sealed against the aperture 88 of the motor adaptor 74 by a duct 115 of the first soft mounting member 76. The outflow chamber 92 is therefore in fluid communication with the inside space 84 of the motor adaptor 74. The other end of the outflow chamber 92 is sealed against the aperture 101 in the radially-extending arm 100 of the L-shaped channel 98 by sealing member 80. The outflow chamber 92 is therefore also in fluid communication with the duct 104 in the lower casing 16b.

[0120] The suction nozzle 6 also has an inner sleeve 116 and an outer sleeve 118 positioned generally concentrically with respect to one another. The sleeves 116, 118 are received inside the agitator 24, and the drive assembly 33 is received almost entirely within the sleeves (with the exception of the drive dog 54). The sleeves 116, 118 extend circumferentially around the motor 34 and gearbox 36, and are concentrically positioned inside the tubular part 24a or the agitator 24. The inner sleeve 116 is supported on first soft mounting member 76, an o-ring 120 positioned around the motor adaptor 74, an o-ring 122 positioned around the gear adaptor 48, and the cover 68.

[0121] The outer sleeve 118 is supported on a sealing member 124 that is mounted on the support member 72, and an o-ring 126 positioned around the inner sleeve 116. The sleeves 116, define a generally annular gap 128 therebetween which forms part of a coolant flow path through which ambient air is drawn into the cleaner head through a vent 108 in the end wall 16f, over the gearbox 36, through the motor 34 and into the suction chamber 18. This will be described in more detail later. As is also discussed in more detail later, the gap 128 forms a passage of annular cross section (relative to the direction of movement of the air flow therethrough). This passage is positioned circumferentially around the agitator axis 26, and circumferentially around the motor 34 and the gearbox 36.

[0122] The inner sleeve 116 has an inlet aperture 130 at one end, a circumferential array of outlet apertures 132 at the other end, and a circumferential array of longitudinal ridges 134. The inner sleeve 116 also provides additional support for the carrier 42 via a bearing 135 and an elastomeric bearing cover 137. The bearing cover 137 forms a further soft mounting member which supports the planet carrier 42, limiting the propagation of vibration between the planet carrier 42 and the inner sleeve 116, and accommodating a small amount of misalignment therebetween (to the extent that this is permitted by the engagement between the projection 51 of the sun gear 38 and the carrier 42).

[0123] The ridges 134 project radially outwards towards the outer sleeve 118, but are nonetheless radially spaced therefrom. The inlet aperture 130 of the inner sleeve 116 is positioned in alignment with the aperture 96 in the inflow chamber 90 of the support member 72. Accordingly, the gap 128 between the sleeves 116, 118 is in fluid communication with the inflow chamber 90. Each outlet aperture 132 is positioned in alignment one of the gaps 62 in the gear adaptor 48, therefore the gap 128 is also in fluid communication with the breather holes 64 in the front of the casing 46 of the motor 34.

[0124] The suction nozzle 6 defines a coolant path configured to direct an air flow from an inlet, past the motor and subsequently over or through the motor, to an outlet. In this case, the vent 108 in the end wall 16e forms the inlet of the coolant path, the duct 104 in the lower casing 16b forms the outlet, and the coolant path directs the air flow past the motor and subsequently through the motor. The coolant path runs through the vent 108, into the inflow chamber 109 through the inlet chamber 106, and into the gap 128 between the sleeves 116, 118. The air flow is then directed past the motor, axially along the gap 128 between the sleeves. The air then flows out of the gap 128, over the gearbox 36 and through the motor 34 inside of the sleeves 116, 188. It then flows into the outflow chamber 92, through the L-shaped channel 98 and duct 104, and exits the suction nozzle 6 through the outlet 12. This will be described in more detail below.

[0125] When the vacuum cleaner 2 is in use, the vacuum motor reduces the pressure at the outlet 12. This, in turn, reduces the pressure inside the suction chamber 18 so as to draw air into it through the suction opening 22. Since the duct 104 is in fluid communication with the outlet 12, the pressure in the duct is also reduced. This acts to draw an air flow (in this case a separate air flow to the dirt-entraining air entering the suction chamber 18 through the suction opening 22) through the coolant path. The air flow enters the coolant path through the vent 108 and into the inlet chamber 106 that is defined by the mounting member 78 and sealing member 83. The vent 108 is positioned on an external surface of the suction nozzle 6, and therefore the air flow is taken from the relatively clean air outside the suction nozzle. In contrast, if the air flow was taken from the suction chamber 18 then dirt entrained therein would be passed through the coolant path, potentially clogging the coolant path and/or damaging the motor. The vent 108 is also positioned at an upper region of the suction nozzle 6 so as to space it apart from the surface being cleaned and thereby reduce the chances of the air flow entering the vent 108 entraining dirt resting on the surface.

[0126] From the inlet chamber 106, the air flow is drawn into the inflow chamber 90 through the aperture 110, and then into the gap 128 through the radial aperture 96 of the support member 72 and the inlet aperture 130 in the inner sleeve 116. The second soft mounting member 82 acts as an air seal in that it prevents leakage of air out of the inflow chamber around the outside of the mounting member 78. Further, the air flow is prevented from leaking out of the coolant path between the inner sleeve 116 and motor adaptor 74 by the first soft mounting member 76 engaging the inner sleeve. The first soft mounting member 76 is therefore also positioned to act as an air seal. In some situations some of the air flow may leak out between the inner sleeve 116 and the support member 72, however any such air would nonetheless be directed into the gap 128 by sealing member 124.

[0127] Upon entering the gap 128 through the inlet aperture 130 of the inner sleeve 116, the air can flow circumferentially around the gap, between the ridges 134 and the outer sleeve 118. The air flow then flows axially along the gap 128, between the motor 34 and the agitator 24, past the motor while circumferentially distributed around it. As the air flow passes the motor 34, it absorbs some heat therefrom and therefore has a cooling effect on the motor. The air flow also absorbs heat from the agitator 24 as the air flows along the gap 128 (and to a lesser extent as the air flows along the inflow chamber 90), ensuring that the agitator remains cool enough to be touched by the user.

[0128] When the air flow running axially along the gap 128 reaches the outlet apertures 132, it has run along around 70% of the total axial length of the agitator 24 (around 20% of the length of the agitator in the inflow chamber 90, and around 50% if the length of the agitator in the gap 128). This relatively large proportion means that the cooling influence of the air flow is experienced by a larger proportion of the agitator 24. This is particularly true for the proportion of the axial length of the agitator 24 along which the air passes whilst in the gap 128, since the air flow is positioned closer to the agitator while in the gap.

[0129] Once the air flow has reached the outlet apertures 132 of the inner sleeve 116, the air flow runs over the parts of the ring gear 44 that are left exposed by the cover 68 and the arms 60 of the gear adaptor 48, and into the gaps 62 of the gear adaptor. As the air flow passes over the ring gear 44, it absorbs heat therefrom and therefore cools the ring gear 44 (and thus the gearbox 36 as a whole). Air is prevented from leaking out of the coolant path past the outlet apertures 132 in between the sleeves 116, 118 by o-ring 126, and is prevented from leaking out between the inner sleeve 116 and the gear adaptor 48 by o-ring 122. Further, air is prevented from leaking out of the coolant path and into the gearbox 36 between the ring gear 44 and the motor casing 46 by o-ring 66, and is prevented from leaking out between the inner sleeve 116 and ring gear 44 by sealing engagement between the ring gear, elastomeric cover 68 and inner sleeve 116. The cover 68 (the third soft mounting member) is therefore also positioned to act as an air seal.

[0130] Since the air flow runs past the motor 34 between the sleeves 116, 118, as the air flow is directed past the motor it is prevented from contacting the motor. The inner sleeve 116 spaces the air flow apart from the motor 34, therefore the air flow does not absorb as much heat from the motor at this point as it would do if the inner sleeve was absent and the air flow could run over the motor. The air flow is therefore cooler when it reaches the gearbox 36, and is thus more able to cool it. That being said, the inner sleeve 116 conducts heat away from the motor 34 and a significant proportion of this heat is absorbed by the air flow, therefore the air flow nonetheless has a cooling effect on the motor 34 as it is directed past it.

[0131] The outer sleeve 118 (along with the inflow and outflow chambers 90, 92 of the support member 72) is positioned to as to prevent the air flow from contacting the agitator. In contrast, if the outer sleeve 118 was absent and tubular portion 24a of the agitator 24 formed a wall of the coolant flow path, it would be necessary to provide kinetic seals at each end of the tubular portion (e.g. one between the tubular portion 24a and the first soft mounting member 76, and another between the tubular portion and the end of the inner sleeve 116 which supports the carrier 42). Such kinetic seals are generally relatively expensive, require relatively tight tolerances and wear out relatively quickly.

[0132] From the gaps 62 in the gear adaptor 48, the air flow runs into the casing 46 of the motor 34 through the breather holes 64, through the motor, out of the motor through the holes 86 and into the inside space 84 of the motor adaptor 74. As the air flow passes through the motor 34, it absorbs further heat from the motor, thereby providing an additional cooling effect thereto.

[0133] From the inside space 84 of the motor adaptor 74, the air flow runs through the aperture 88 in the motor adaptor, through the duct 115 of the first soft mounting member 76 and into the outflow chamber 92 of the support member 72. Leakage of air out of the coolant path between the motor adaptor 74 and first soft mounting member 76 is prevented by engagement between the first soft mounting member 76 and the inner sleeve 116 and by the o-ring 120.

[0134] The air in the outflow chamber 92 is then drawn through the aperture 101 into radially-extending arm 100 of the L-shaped channel 98 defined by the mounting member 78 and second soft mounting member 82. The air then flows along the L-shaped channel 98, into the duct 104 which forms the outlet from the coolant path. The air flow then merges with dirt-entrained air flowing from the suction chamber 18, and exits the suction nozzle 6 through the outlet 12.

[0135] It is noteworthy that in this embodiment the air flow through the coolant path flows over the gearbox 36 and then through the motor 34. This ensures that the gearbox is cooled sufficiently. If instead the air flow passed through the motor 34 and then over the gearbox 36 (which may appear to be preferable at first glance, so as to avoid wear particles from the gearbox from being drawn into the motor), the air flow may be too hot by the time it reaches the gearbox for the gearbox to be cooled adequately.

[0136] It is also to be noted that in this embodiment the coolant path directs the air flow to enter the agitator 24 at one axial end (through the aperture 110 and the inflow chamber 90), and to exit the agitator at the same axial end (through the outflow chamber 92 and the aperture 101). This enables the opposite end of the agitator and the associated structure to be relatively simple in comparison to an arrangement where the coolant path was required to pass through this end of the agitator as well.

[0137] In this embodiment, the agitator 24 is removable from suction chamber 18 (and from the suction nozzle 6 in its entirety). More particularly, it is removable from around the drive assembly 33. This will be described in more detail below with reference to FIGS. 12 and 13, in combination with FIGS. 1-11. In this embodiment, the agitator 24 is removable by moving it along its axis 26, out through an aperture 136 in the casing 16 at an end thereof, the aperture being selectively closable by an end cap 138. In this case, the end cap 138 provides end wall 16f, a sealing member 139, and a hair ingress flange 140 which projects into an end of the agitator in close radial clearance therewith so as to reduce the possibility of hair working its way further into the agitator 24.

[0138] The agitator is supported for its rotation on two bearings 142, 144. Bearing 142 is positioned in the hair ingress flange 140 of the end cap, and engages a stub 146 of the closed end part 24b of the agitator 24. Bearing 144 is positioned on the support member 72. The support member 72 therefore supports the agitator for rotation inside the suction chamber 18. Bearing 144 is positioned adjacent to another hair ingress flange 148, and engages the inside of the tubular part 24a of the agitator 24 via a support ring 150. The support ring 150 has a circumferential array of spaced-apart fins 152 which slidingly engage the tubular part 24a of the agitator. The fins 152 being spaced apart means that any pressure difference across the support ring 150 (for instance due to a temperature difference) can equalise. Otherwise, this pressure difference could pull dirt into the bearing 144 and clog it. The support ring 150 is substantially rigid, therefore the engagement between the support member 72 and the agitator 24 substantially prevents relative translation between the agitator and the support member (while the bearing 92 allows the agitator to rotate in a fixed position 24 relative to the support member 72).

[0139] The end cap 138 has circumferential array of recesses 154, each recess being bounded by an outwardly-projecting ridge 156. The aperture 136 has a complementary circumferential array of projections in the form of lugs 158. The end cap 138 can be attached to the casing suction nozzle 6 by rotating the end cap about the longitudinal axis 26 of the agitator 24 to a locked position, which positions each lug 158 within a corresponding recess 154. In other words, the ridges 156 are hooked onto the lugs 158. The end cap 138 can be released from the suction nozzle 6 by rotating the end cap 138 to the unlocked position, which positions the lugs 158 outside of the recesses 154.

[0140] The end cap 138 has a pivotable latch member 160 which can secure the end cap in the locked position. This reduces the risk of the end cap 138 being rotated to the unlocked position (thereby potentially opening the aperture 136 and releasing the agitator 24) unintentionally, for instance due to a knock. The latch member 160 is pivotably mounted on the end cap 138, and has a latch tooth (not visible) and a push-button 162. The latch tooth (not visible) engages an abutment surface 164 provided on the lower casing 16b so as to prevent rotation of the end cap 138 to the unlocked position. Further, the latch tooth (not visible) can be lifted out of alignment with the abutment surface by pressing the button 162 and thereby pivoting the latch member 160.

[0141] The agitator 24 slidably engages the bearing 144 via the support ring 150 as noted above. However, the stub 146 of the agitator 24 and the bearing 142 exhibit an interference fit. Accordingly, when a user removes the end cap 138, the agitator is removed along with it. Nonetheless, the agitator 24 and end cap 138 are separable from one another by applying sufficient force to overcome the interference fit between the bearing 142 and the agitator 24.

[0142] It will be appreciated that numerous modifications to the above described embodiments may be made without departing from the scope of invention as defined in the appended claims. For instance, in a modification of the above embodiment the first and second soft mounting members may be two parts of a single elastomeric moulding. For instance they may be two ends of a moulding which covers substantially all of the outer surfaces of the support member and mounting member.

[0143] It is to be noted that although the mounting member has been described as an independent component, it may instead be considered to be part of a two-piece support element. Equally, it may be considered to be part of a two-piece second soft mounting member.