KR20230147207A - cleaner head - Google Patents

Abstract

A cleaner head (20) for a vacuum cleaner (2), said cleaner head being configured to apply suction to a horizontal surface (S) to be cleaned, said cleaner head being configured to apply suction to a horizontal surface (S) to be cleaned, said cleaner head (20) comprising: a first cleaner head (20) mounted for rotation about respective axes (R1, R2); A stirrer element and a second stirrer element 22, 24, each stirrer element comprising a free end first end 26a, 26b and a second end 28a, 28b, each stirrer element having a rotation axis. The first agitator element and the second agitator element are cantilevered from opposite sides of the hub portion 30 of the cleaner head at each second end. wherein each stirrer element is arranged such that the position of the axis at the first end of each stirrer element is more forward than the position of the axis at the second end of each stirrer element.

Description

cleaner head

The present invention relates to a cleaner head for a vacuum cleaner. The invention also relates to a vacuum cleaner comprising a cleaner head.

A vacuum cleaner generally includes a body containing dust and dust separation devices, a cleaner head connected to the body and having an inlet, and a motor-driven fan unit that draws air containing dust into the vacuum cleaner body through the inlet and the cleaner head. do. The suction port is directed downward towards the floor surface to be cleaned. Air containing dust can be passed to a separation device to separate dust and foreign matter from the air before it is discharged into the atmosphere. The separation device may include one or more of a filter, filter bag, and cyclone arrangement.

The driven agitator may be mounted to rotate within the intake port of the cleaner head. The rotation of the agitator may be driven by an electric motor driven by a power supply derived from the vacuum cleaner body. The agitator sweeps dust backwards through the suction port of the cleaner head.

The object of the present invention is to provide an improved cleaner head for a vacuum cleaner.

According to one aspect of the present invention, a cleaner head for a vacuum cleaner is provided. The vacuum head is configured to apply suction to a horizontal surface to be vacuumed. The cleaner head includes a first agitator element and a second agitator element, each agitator element being mounted to rotate about its respective axis. Each agitator element includes a first end and a second end, which are free ends. Each stirrer element has a shape that tapers to a first end in one direction along the axis of rotation. The first and second agitator elements are cantilevered from opposite sides of the hub portion of the cleaner head at their respective second ends. Each stirrer element is arranged such that the position of the axis at the first end of each stirrer element is more forward than the position of the axis at the second end of each stirrer element.

In embodiments, each agitator element is positioned so that the axis of the first end of each agitator element is located further forward than the axis of the second end of each agitator element, so that the agitator element is substantially forward and in front of the cleaner head. It is tilted towards and away from the rear of the cleaner head where the outlet is located. The front and rear of many vacuum cleaner heads are clearly defined, and the forward direction can be understood in this context. For example, the forward direction may correspond to the direction in which a forward stroke is performed when using a vacuum cleaner with a cleaner head attached. The forward direction may alternatively or additionally be defined as the direction that becomes apparent when considering that the area to which suction is applied is generally behind the agitator element. The forward direction may alternatively or additionally be defined as the direction apparent when considering that the agitator element of the invention generally moves dirt and debris in a backward direction from the horizontal surface to be cleaned. The forward direction can be defined in relation to the orientation of the cleaner head when cleaning a horizontal surface. The forward direction may be parallel to this horizontal plane. In one embodiment, the axis of the stirrer element may be considered to be tilted forward.

The angle at which the outer surface of each agitator element is tapered may be equal to the angle at which the axis of the agitator element is tilted forward (optionally within +/- 20% or within +/- 10%). The forward tilt angle of the axis of the stirrer element may be less than 45 degrees and may range from 10 to 30 degrees.

In embodiments where the axis of the stirrer element is tilted forward as described above, the tapering profile of the stirrer element, which may be generally truncated conical, is at least partially corrected. Accordingly, when the cleaner head is pushed against an obstacle such as a wall or skirting board, the un-agitated area of the surface to be cleaned near the first end of the agitator element may be reduced or eliminated. When the cleaner head is pushed up against an obstacle that is located directly in front of the cleaner head and has a flat vertical surface facing the cleaner head (e.g. when the agitator elements are of symmetrical shape and arranged symmetrically, the second end of each agitator element is vertical) equidistant from the surface), it is desirable to have a single contact/agitation area between the vertical surface and the two agitator elements (i.e. no gap exists between each area agitated by the two agitator elements of the cleaner head). .

In one embodiment, when the cleaner head applies suction, the leading portions of the outer surfaces of both agitator elements lie in a single plane perpendicular to the horizontal surface. In this way, by pushing the cleaner head against an obstacle such as a wall or skirting board, un-agitated areas of the surface near the first end of the agitator element can be removed.

In an embodiment, the cleaner head further includes a sole plate on which a suction opening is formed. The leading portions of the outer surfaces of both agitator elements may lie in a single plane perpendicular to the plane of the sole plate. The cleaner head may be configured such that when in use, the sole plate is generally held parallel to the surface to be cleaned.

In an embodiment, the most anterior portions of the second ends of the agitator elements are directly adjacent to each other and the most posterior portions of the second ends of the agitator elements are spaced apart.

In an embodiment, the exterior surface of the agitator element includes a felt-like covering. Felt-like coverings may consist of an array of several fine fluffs and may, for example, have a fluffy texture or shape.

In an embodiment, the outer surface of the agitator element includes bristles, for example upright bristles arranged around the agitator element, which may be in the form of a spiral bristle strip.

In embodiments, the outer surface of the agitator element includes an absorbent material, such as a sponge. These agitator elements can be arranged to absorb liquid spills or act as mop pads to perform wet cleaning of hard floor surfaces.

The stirrer elements may have the same overall shape. The stirrer element may be of symmetrical shape. The stirrer elements may be arranged symmetrically.

In an embodiment, the cleaner head further includes a drive for driving rotation of the agitator element.

The drive may include a first motor and a second motor, where the first motor may be arranged to drive rotation of the first agitator element and the second motor may be arranged to drive rotation of the second agitator element.

In embodiments, each motor is disposed at least partially within the core of each agitator element. In this way, compact arrangements are possible.

In an embodiment, the first and second motors are arranged back-to-back and counter-rotate so that in use the first and second agitator elements rotate in the same direction.

In an embodiment, the drive further includes first and second gears (e.g., reduction gears) arranged to change (e.g., reduce) output speeds of the first and second motors, respectively, The second gear is disposed within the cores of the first and second agitator elements, respectively.

In an embodiment, the drive includes a single motor arranged to drive rotation of the first and second agitator elements through respective first and second transmissions. Such a transmission may each dispose a first and a second agitator element at least partially within the core.

In an embodiment, the agitator element is positioned such that when the cleaner head applies suction to a horizontal surface, the position of the axis at the first end of the element is closer to the surface than the position of the axis at the second end of the element.

In embodiments, the agitator elements are arranged such that the position of the axis at the first end (the free end) of each element is closer to the surface to be cleaned than the position of the axis at the second end (e.g., the opposing end) of each element. Thereby, the agitator element is angled substantially downward, towards the surface to be cleaned by the vacuum cleaner and away from the upper housing part of the cleaner head. In this way, the tapered profile of the stirrer element, which may generally be truncated conical, is at least partially corrected. Accordingly, more of the outer surface of each stirrer element is in contact with the surface during use. Additionally, tilting the tapered stirrer element downward in this way reduces the gap that may exist between the lowermost portions of the two stirrer elements at the second end. This means that a larger area of the surface between the agitator elements is agitated by the cleaner head, preferably with a single contact/agitated area between the surface to be cleaned and the two agitator elements (e.g. by the two agitator elements of the cleaner head). no gaps exist between each stirred zone). In one embodiment, the axis of the stirrer element may be considered to be tilted downward.

In one embodiment, when the cleaner head applies suction, the lowermost portion of the outer surface of each agitator element is parallel to a horizontal surface. This ensures that when using the bottom surface, each agitator element is in full contact with the surface to be cleaned over its entire length. The angle at which the outer surface of each agitator element is tapered may be equal to the angle at which the axis of the agitator element is tilted downward (optionally within +/- 20% or within +/- 10%). The angle at which the outer surface of each agitator element is tapered may be less than 45 degrees and may range from 10 to 30 degrees. The downward tilt angle of the axis of the stirrer element may be less than 45 degrees and may range from 10 to 30 degrees.

According to a second aspect of the present invention, a vacuum cleaner comprising a cleaner head according to the first aspect is provided.

It should be understood that features described in relation to one aspect of the invention may be incorporated into other aspects of the invention.

Now, embodiments of the present invention will be described by way of example only with reference to the attached schematic drawings:
1 is a perspective view of a handheld vacuum cleaner.
FIG. 2 is a perspective view of the cleaner head of the vacuum cleaner shown in FIG. 1.
FIG. 3 is a front view of the cleaner head shown in FIG. 2.
FIGS. 4A and 4B compare the cantilevered non-tapered agitator and the cantilevered agitator of the cleaner head shown in FIG. 2.
FIG. 5 is a bottom view of the cleaner head shown in FIG. 2.
Figures 6a, 6b are simplified top views of a cleaner head with a cantilevered agitator with and without a forward angle of the agitator element.
FIG. 7 is a side view of the cleaner head shown in FIG. 2.
Figure 8 is a front view of the cleaner head with the agitator element protruding through the side opening of the cleaner head housing.
FIGS. 9A and 9B are cutaway views of the bottom of the cleaner head shown in FIG. 2.

1 shows a handheld vacuum cleaner (2) according to an embodiment of the present invention, comprising a body (4), a wand (6) and a cleaner head (20). The body 4 includes a separation system 10 in the form of a cyclone separator, a motor and impeller (not shown) arranged to suck air through the separation system 10, and a power supply in the form of a battery to power the motor. Includes (12). The main body 4 includes a handle 14 for the user to hold and a purified air outlet 16 through which air passing through the separation system 10 is discharged. One end of the wand 6 is attached to the main body 4, and the other end is attached to the cleaner head 20. Wand 6 provides fluid communication between cleaner head 20 and separation system 10 and supports cleaner head 20 during use.

Figure 2 shows a cleaner head 20 according to an embodiment of the present invention. The cleaner head 20 includes a first agitator element 22 and a second agitator element 24. The first and second stirrer elements 22 and 24 are respectively mounted for rotation about respective axes R1 and R2. Each agitator element 22, 24 includes a first, free end 26a, 26b and a second end 28a, 28b, which are mounted on the cleaner head 20. Each stirrer element has a shape that tapers to a first end in one direction along the rotation axis (R1, R2). In the depicted embodiment, the agitator elements 22, 24 are generally truncated cones. However, it should be understood that a portion of one or both agitator elements 22, 24 may not be tapered. For example, the shape of one or both of the stirrer elements 22, 24 may consist of a cylindrical portion combined with a truncated conical portion. The first and second agitator elements 22, 24 are cantilevered from opposite sides of the hub portion 30 of the cleaner head 20 at their respective second ends 28a, 28b. In the illustrated embodiment, the hub portion 30 is in a laterally central position relative to the entire cleaner head 20, but this may not always be the case. For example, if the first agitator elements 22, 24 and the second agitator elements 22, 24 are of different lengths, the hub portion 30 may be laterally offset relative to the side center portion of the cleaner head 20. You can. The cleaner head 20 has a housing 32 that at least partially defines a suction chamber including an outlet 34 for expelling air and debris towards the vacuum cleaner 2 . The suction chamber is bounded at the front by agitator elements 22, 24. Housing 32 includes side openings 36 adjacent first ends 26a, 26b of each agitator element 22, 24. The function of this side opening 36 is described below. The outer surface of the agitator element is comprised of a felt-like covering and, in some embodiments, strips of upright helical bristles.

As shown most clearly in Figure 3, which is a front view of the cleaner head 20, each agitator element 22, 24 moves when the cleaner head 20 applies suction to the horizontal surface to be cleaned (e.g., hard flooring). , the position of the axes R1, R2 at the first ends 26a, 26b of each agitator element 22, 24 is relative to the axis R2 at the second end 28a, 28b of each agitator element 22, 24. ) is placed closer to the surface (S) than the location of ). Accordingly, the agitator elements 22 , 24 are substantially inclined downwards (eg bent downwards) towards the surface S to be cleaned by the vacuum cleaner 2 . In Figure 3, the axes R1, R2 of the two stirrer elements 22, 24 are tilted downward by the same angle α. In this way, the tapering profile of the stirrer elements 22, 24, which is truncated in the embodiment shown, is at least partially compensated, such that the surfaces S proximate the first ends 26a, 26b of the stirrer elements 22, 24. ) area is stirred. Additionally, by tilting the tapered agitator elements 22, 24 downward, the lowermost portions of the two agitator elements 22, 24 (i.e., indicated as "P" in FIG. 3) at each second end 28a, 28b. The gap that may exist between the two agitator elements 22, 24 is reduced, allowing a larger area of the surface S between the two agitator elements 22, 24 to be effectively agitated by the cleaner head 20.

In the illustrated embodiment, the downward angle of the agitator elements 22, 24 is such that the lowermost portion of the outer surface of each agitator element 22, 24 is parallel to the horizontal surface S when the cleaner head 20 applies suction. Make it possible. Additionally, there is substantially no gap between the lowermost portions of the second ends 28a, 28b of the agitator elements 22, 24, i.e. the lowermost portions of the agitator elements 22, 24 are adjacent to the second ends 28a, 28b. are in contact with This means that there is little or no unstirred area of the surface S between the two stirrer elements 22, 24 (i.e. the area marked "P" in Figure 3). In this embodiment, each area of the floor being agitated by the two agitator elements is in contact with each other, so that there is one single (elastic) area of the floor being agitated by the cleaner head at any given time. In general, this condition (with the lowermost part of the agitator element being parallel to the floor) causes the agitator elements 22, 24 to be tilted downward by an angle α equal to half the cone angle of the truncated conical agitator elements 22, 24. It is achieved when you lose. The tapering angle of the outer surface cone of each stirrer element has a tapering angle equal to half the cone angle, which is therefore equal to the angle α at which the axis of the stirrer element is tilted downward in the illustrated embodiment. In this example, angle α is approximately 15 degrees. Given that the outer surface of each agitator element may have some elasticity/deformability, and that in practice the surface to be cleaned is rarely perfectly flat, the agitator element may have a substantially It will be appreciated that in order to cause agitation of the surface to be cleaned along its entire length, the lowermost part need not be exactly parallel to the horizontal surface in a strict mathematical sense.

4A and 4B show reducing the gap between the lowermost portions 28a, 28b at the second ends 28a, 28b of the agitator elements 22, 24 (i.e., the area marked “P” in FIG. 3). . Figure 4a shows a front view of a cleaner head consisting of a pair of cylindrical (i.e. non-tapered) agitator elements 22', 24' cantilevered at a hub 30'. Due to the presence of the hub 30', there is a region P of the surface S beneath the hub 30' that is not agitated by either of the agitator elements 22', 24'. Figure 4b is a simplified version of Figure 3, showing a front view of a cleaner head 20 (i.e. with a tapered agitator element) according to an embodiment of the invention. Due to the tapered shape of the stirrer elements 22, 24 and the downward angle of the elements 22, 24 by angle α, there is a much smaller area P of the non-stirred surface S below the hub 30. It should be noted that it exists. In reality, there may be no unstirred area at all.

Figure 5 is a bottom view of the cleaner head 20, in embodiments each agitator element 22, 24 is positioned on an axis R1, R2 at the first end 26a, 26b of each agitator element 22, 24. It is shown how the positions of are arranged so that they are located further forward than the positions of the axes R1, R2 at the second ends 28a, 28b of each stirrer element 22, 24. Accordingly, the agitator elements 22, 24 are moved substantially forward, towards the front of the cleaner head 20 and away from the outlet 34, i.e. with the vacuum cleaner 2 to which the cleaner head 20 is attached. It is angled in the direction corresponding to the forward cleaning stroke. In this way, the tapered profile of the stirrer elements 22, 24, which in the illustrated embodiment are truncated cones, is at least partially corrected, as described below.

5, the axes R1, R2 of both agitator elements 22, 24 are such that when the cleaner head 20 applies suction, the most forward portions of the outer surfaces of both agitator elements 22, 24 are horizontal surfaces. It is tilted forward by the same angle β so that it lies in a single plane perpendicular to (S). In this way, pushing the cleaner head 20 against an object such as a wall or skirting board will reduce the unstirred area of the surface S near the first ends 26a, 26b of the agitator elements 22, 24. You can. In certain embodiments, unstirred areas of surface S near first ends 26a, 26b of stirrer elements 22, 24 may be minimized. This particular condition is achieved when the stirrer elements 22, 24 are tilted forward by an angle β corresponding to half the cone angle of the truncated conical stirrer elements 22, 24. Due to this, the free ends (first ends) 26a, 26b of the truncated conical agitator elements 22, 24 are all positioned as close as possible to the wall, so that very little unstirred area of the surface S is left near the wall. there is. This arrangement may be useful where agitation of a vertical surface is required, for example when cleaning stairs, where a line of contact with the vertical surface runs from the free end 26a of one element to the free end 26b of the other agitator element. This is because it may not stop. The conical tapering of the outer surface of each stirrer element has a tapering angle equal to the angle β at which the axis of the stirrer element tilts forward. In this example, angle β is approximately 15 degrees.

This effect is explained more clearly with reference to Figures 6a and 6b. Figure 6a, a simplified top view of the cleaner head 20, shows that in embodiments each agitator element 22, 24 is positioned on an axis R1, R2 at a first end 26a, 26b of each agitator element 22, 24. ) is arranged so that the positions of the axes R1, R2 are no further forward than the positions of the axes R1, R2 at the second ends 28a, 28b of each stirrer element 22, 24. In this way, when the cleaner head is moved upward relative to an object W, such as a wall or skirting board, the foremost portions of the agitator elements 22, 24 contact the object W, thereby tilting the cleaner head at different angles, e.g. For example, gaps (G1, G2) are left on both sides where the surface (S) cannot be agitated without repositioning to approach at a different angle from the forward direction (F) perpendicular to the plane of the object (W). FIG. 6B is a simplified top view of the cleaner head 20 shown in FIG. 5 in which the axes R1 and R2 of both agitator elements 22 and 24 are tilted forward by the same angle β, so that the cleaner head 20 When applying suction, the most advanced parts of the outer surfaces of both agitator elements 22, 24 lie in a single plane perpendicular to the horizontal surface S. Accordingly, when the cleaner head 20 is pushed up against the object W, the unstirred regions G1, G2 of the surface S near the first ends 26a, 26b of the agitator elements 22, 24. This is minimized. Given that the outer surface of each agitator element may have some elasticity/deformability and that walls, skirting boards, etc. are rarely perfectly flat and vertical, the agitator element must be close enough to the wall or skirting board to allow It will be appreciated that the leading portions of the outer surfaces of the two stirrer elements need not be exactly straight or lie entirely within a single plane in a strict mathematical sense to provide an advantage.

It should be understood that in some embodiments, the agitator element may be inclined downward but not forward, while in other embodiments the agitator element may be tilted forward but not downward. Additionally, the agitator element does not necessarily have to be tilted downward by an angle equal to half the cone angle of the agitator element, and the agitator element does not necessarily have to be tilted forward by an angle equal to half the cone angle of the agitator element. You must understand. In embodiments, the stirrer elements may have different lengths and/or different cone angles. Accordingly, the first and second agitator elements may be tilted forward and/or downward at different angles. In some embodiments, the cleaner head 20 includes a sole plate on which a suction opening is formed. The lowermost portion of the outer surface of each agitator element may be parallel to the sole plate and/or the most anterior portions of the outer surface of both agitator elements may lie in a single plane perpendicular to the plane of the sole plate.

A cleaner head 20 according to an embodiment of the invention has a cleaner head housing 32 that includes a side opening 36 adjacent a first end 26a, 26b of each agitator element 22, 24. These side openings 36 can be seen in Figures 2, 3, 5 and 7. The side opening 36 serves two functions. Firstly, in an embodiment, they provide a suction path from the first ends 26a, 26b of the agitator elements 22, 24 towards the cleaner head outlet 34. In this way, the vacuum cleaner 2 can pick up foreign substances, such as hair, that have moved to the first ends 26a, 26b of the tapered agitator elements 22, 24 and are likely to fall off the first ends. Second, in embodiments, the first ends 26a, 26b of the stirrer elements 22, 24 may protrude into or through the side openings 36. This allows the first ends 26a, 26b of the agitator elements 22, 24 to protrude beyond the footprint of the cleaner head housing 32, widening the agitation width and enabling edge-to-edge cleaning. 8 shows the first ends 26a, 26b of the agitator elements 22, 24 protruding through the side openings 36, such that the first end of each agitator element protrudes beyond the footprint of the cleaner head housing 32. A front view of the vacuum cleaner head 20 is schematically shown.

It should be understood that in embodiments, side opening 36 may serve only one of these two functions. For example, the side opening 36 may provide a suction path in the manner described, but the first ends 26a, 26b of the agitator element may not protrude into or through the side opening 36. . Alternatively, the first ends 26a, 26b of the agitator elements 22, 24 may protrude into or through the side openings 36, although the first ends 26a, 26b are protruded from the side openings 36. ) may be sized to substantially fill the suction chamber. In this way, no such intake path is provided. It should also be appreciated that in some embodiments of the cleaner head, only one agitator element may be provided while still taking advantage of the advantages provided by the side openings 36 of the cleaner head housing 32.

9A and 9B, which show the cleaner head 20 from below, the cleaner head 20 further includes a drive for driving the rotation of the agitator elements 22, 24. 9A , the drive includes a first motor 38 arranged to drive rotation of the first agitator element 22 and a second motor 40 arranged to drive rotation of the second agitator element 24. Includes. Each motor is disposed (at least partially) within the core of its corresponding stirrer element 22, 24. It should be understood that the motor may be fully contained within the stirrer core or may protrude slightly outward towards the hub 30 area between the two cantilevered stirrer elements 22, 24. The first and second motors 38, 40 are arranged back-to-back and thus rotate counterclockwise (i.e., the output shaft of one motor rotates clockwise and the output shaft of the other motor rotates clockwise). are arranged to rotate in opposite directions, so that in use the first and second agitator elements 22, 24 rotate in the same direction. In the depicted embodiment, the drive has first and second gears 42, 44 (e.g. , reduction gear) is further included. Like motors 38 and 40, gears 42 and 44 are disposed (at least partially) within the core of each agitator element 22 and 24. 9B, the drive includes a single motor 46 arranged to drive rotation of the first and second agitator elements 22, 24 through respective first and second transmissions 48, 50. do.

Wherever in the foregoing description integers or elements are mentioned for which known, obvious or predictable equivalents are known, such equivalents are incorporated into the specification as if individually indicated. Reference should be made to the claims to determine the true scope of the invention, and the claims should be construed to include such equivalents. Additionally, it will be understood that integers or features described as preferred, advantageous, convenient, etc. in the present invention are optional and do not limit the scope of the independent claims. Moreover, it should be understood that while these optional integers or features may be of possible advantage in some embodiments of the invention, they may be undesirable and therefore absent in other embodiments.

Claims (14)

As a cleaner head for a vacuum cleaner,
The cleaner head is configured to apply suction to a horizontal surface to be vacuumed and includes a first agitator element and a second agitator element mounted for rotation about a respective axis;
Each agitator element includes a first end and a second end that are free ends,
Each agitator element has a shape that tapers toward the first end in one direction along the axis of rotation,
the first agitator element and the second agitator element are cantilevered from opposite sides of the hub portion of the cleaner head at each second end;
Each stirrer element is arranged such that the position of the axis at the first end of each stirrer element is more forward than the position of the axis at the second end of each stirrer element.
Vacuum cleaner head. According to claim 1,
When the cleaner head applies suction, the leading portions of the outer surfaces of both agitator elements lie in a single plane perpendicular to the horizontal surface.
Vacuum cleaner head. The method of claim 1 or 2,
The cleaner head further comprises a sole plate on which a suction opening is formed, wherein the foremost portions of the outer surfaces of both agitator elements lie in a single plane perpendicular to the plane of the sole plate.
Vacuum cleaner head. The method according to any one of claims 1 to 3,
wherein the most anterior portions of the second ends of the agitator elements are directly adjacent to each other and the most posterior portions of the second ends of the agitator elements are spaced apart.
Vacuum cleaner head. The method according to any one of claims 1 to 4,
wherein the outer surface of the agitator element includes a felt-like covering,
Vacuum cleaner head. The method according to any one of claims 1 to 5,
wherein the outer surface of the agitator element comprises strips of bristles.
Vacuum cleaner head. The method according to any one of claims 1 to 6,
further comprising a drive for driving rotation of the agitator element,
Vacuum cleaner head. According to claim 7,
The drive includes a first motor and a second motor, the first motor arranged to drive rotation of the first agitator element, and the second motor arranged to drive rotation of the second agitator element.
Vacuum cleaner head. According to claim 8,
each motor being at least partially disposed within the core of each agitator element,
Vacuum cleaner head. According to claim 8 or 9,
The first motor and the second motor are arranged back-to-back and rotate in reverse, such that in use the first agitator element and the second agitator element rotate in the same direction,
Vacuum cleaner head. The method according to any one of claims 8 to 10,
The drive further includes a first gear and a second gear arranged to change output speeds of the first motor and the second motor, respectively, wherein the first gear and the second gear are respectively configured to change the output speed of the first agitator element and the second motor. disposed within the core of the second agitator element,
Vacuum cleaner head. According to claim 7,
the drive comprising a single motor arranged to drive rotation of both the first and second agitator elements through respective first and second transmissions,
Vacuum cleaner head. The method according to any one of claims 1 to 12,
Each agitator element is further arranged such that when the cleaner head applies suction to the horizontal surface, the position of the axis at the first end of the element is closer to the surface than the position of the axis at the second end of the element.
Vacuum cleaner head. Comprising a cleaner head according to any one of claims 1 to 13,
Vacuum cleaner.