Title of Invention

FLOOR SWEEPING APPARATUS

Abstract

A floor sweeping apparatus of the type having a rotary brush member, which in use is driven to rotate about a generally horizontal axis, the brush member having bristle elements that, as the member rotates, extend during part of their range of movement through an aperture in a base plate of a housing in which the rotary brush member is rotatably journalled, wherein there is at least one bristle element, hereinafter called an end-most bristle element, arranged immediately adjacent to each end of said brush member, and characterised in that a deflector member is provided at each end of the aperture to co-operate with said end-most bristle element at the respective end of the brush member and deflect said end-most bristle element axially outwardly as said end- most bristle element extends through the aperture during the rotation of the brush member.

Full Text

Description of Invention This invention relates to floor sweeping apparatus of the type having a rotary brush member, which in use is driven to rotate about a generally horizontal axis, the brush member having bristle elements that, as the member rotates, extend during part of their range of movement through an aperture in a baseplate of a housing in which the member is rotatablyjoumalled. Such apparatus may typically form part of a vacuimi cleaner, and in that case suction will noimally be applied to the housing to draw collected dirt and debris away form the brush member to a suitable collecting chamber which is disposed remotely from the housing. However, the apparatus may also from part of a mechanical floor sweeper of the kind in which tiie housing itself is provided with a receptacle which serves to collect dht and debris thrown from the brush member as it rotates. . In such apparatus there has been a long-standing problem in that the sweeping action can only take place within the confines of the housing, and more particularly within the confines of the aperture through which the bristle elements come into contact with tlie surface being swept. Conventionally, the brush member is mounted in the housing by means of bearings at the ends thereof, so tliat each end of the brush member is spaced inwaidly from the side face of the Iiousing by a distance sufficient to accommodate the bearing. This effectively makes it impossible for the user to clean fully to the edge of a floor, thus leaving an unswept strip at the junction between the floor or floor covering and the wall or skirting at the base of the wall. In an attempt to reduce the width of such unswept strip in some cases the bmsh member has been designed to be supported by bearings that are disposed at positions spaced inwardly of the ends of tlie brush member and thus disposed away from the side faces of the housing, so that the aperture can extend fully up to tlie side walls of the housing and bristle elements can correspondingly be provided immediately adjacent to the sides of the housing. Whilst this represents an improvement in that it reduces the width of the unswept strip, it does not eliminate the unswept strip entirely, and it has also been proposed to provide, at positions adjacent to the sides of the housing, additional rotary bi"ushes which are arranged for rotation about substantially vertical axes so that bristles thereof extend beyond the side faces of the housing during part of their range of movement. However such an arrangement involves substantial additional complication in the construction of the apparatus and is accordingly costly to implement. According to the present invention there is provided floor sweeping apparatus of the type having a rotary brush member, which in use is driven to rotate about a generally horizontal axis, the brush member having bristle elements that, as the member rotates, extend during part of their range of movement through an apeiture in a base plate of a housing in which the rotary brush member is rotatably joumalled, wherein there is at least one bristle element, hereinafter called an end-most bristle element, arranged immediately adjacent to each end of said brush member, and wherein a deflector member is provided at each end of the apeiture to co-operate with said end-most bristle element at the respective end of the brush member and deflect said end-most bristle element axially outwardly as said end-most bristle element extends through the aperture during the rotation of the brush member. To facilitate such deflection of the end-most bristle element, the lower edge of a side wall of the housing may be fomied with a recess in register with the end of the aperture, and preferably the aiiangement is such that the end-most bristle element projects outwardly beyond the end of the aperture. The deflector member may comprise a guide wire of appropriate form which is airanged to extend across the apertme adjacent the end thereof Typically the guide wire may be of generally smoothly curved shape so that as, or immediately after, the end-most bristle element first extends through the aperture it contacts the guide wire and is smoothly deflected outwardly to reach maximum deflection at or slightly before its lowest point, and is then allowed to return in a manner controlled by the remainder of the guide wire. However, it will be appreciated that other arrangements are possible. For example, the guide wire may be formed with a generally straight middle section and curved or angled end portions so that the end-most bristle element is maintained at substantially maximum deflection over most of its travel while extending through the aperture. Moreover, it may be desirable to contour tiie guide wire such that the end-most biistle does not contact the surface being swept while it is moving outwardly, so as to avoid any tendency to throw dust away from the apeituve, but only engages the suiface during its return inward movement, thus throwing any dust towards the apeiture for collection. The deflector member may alternatively be formed integrally with the base plate of the housing, and in some cases may not extend across the entire width of the apeiture. If required, the housing may include a guide adjacent the edge of the aperture at which the end-most bristle element passes back into the housing so as positively to return the bristle element axially inwardly. The rotary brush member may be supported by bearings which engage it externally at positions spaced inwardly from its opposite ends, or by internal bearings carried by stub axles which extend from the side walls of the housing and into end portions of the brush member, the an-angement in either case being such that the brush member is enabled to extend fiilly up to, but preferably not into direct contact with, the adjacent side wall. Accordingly the present invention provides a floor sweeping apparatus of the type having a rotary brush member, which in use is driven to rotate about a generally horizontal axis, the brush member having bristle elements that, as the member rotates, extend during part of their range of movement through an aperture in a base plate of a housing in which the rotary brush member is rotatably joumalled, wherein there is at least one bristle element, hereinafter called an end-most bristle element, arranged immediately adjacent to each end of said brush member, and characterised in that a deflector member is provided at each end of the aperture to co-operate with said end-most bristle element at the respective end of the brush member and deflect said end-most bristle element axially outwardly as said end-most bristle element extends through the aperture during the rotation of the brush member. These and other features of the invention will now be described witfi reference to the accompanying drawings wherein: Figure 1 is a fragmentary end view of a first embodiment of floor sweeper in accordance with the invention; Figure 2 is a fragmentary underneath plan view of the embodiment of Figure 1; Figure 3 is a fragmentary end view of a second embodiment of floor sweeper in accordance with the invention; Figure 4 is a fragmentaiy underneath plan view of the embodiment of Figure 3, and Figures 5 and 6 are fraginentaiy end views of alternative forms of deflector member. Referring to Figures 1 and 1, a floor sweeper 9 in accordance with die invention includes a housing 10 having side walls II (only one of which is illustrated) and at its underside a base plate 12. . A rotary brush member 20 is mounted in the housing 10 for rotation about an axis which, when the sweeper 9 is in use, extends generally horizontally above the surface being cleaned. The member 20 comprises a generally cylindrical body 21 from which spaced bristle elements 22 project radially. In this embodimem, eacli bristle eleinent 22 comprises a group of bristles an-anged in a tuft, but it will be appreciated that other aiiangements are possible. The base plate 12 is fonned with an aperture 13 which extends fully between the side walls 11 of the housing 10, so as to allow the bristle elements 22 to project thiough the base plate 12 and into engagement with the surface being cleaned as the brush member 22 is rotated. In this embodiment, the aperture 13 is bridged at positions inset from the side walls 11 by cross members 14 which cany bearings (not shown) which support the cylindrical body 21 by external engagement with reduced diameter portions 23 thereof. In this way, the cylindrical body 21 can extend fully up to the side walls 11 of the housing, but preferably with sufficient clearance to avoid direct contact with the internal faces thereof. However, as shown in Figures 3 and 4 (in which like parts carry like references), it is possible as an alternative for the cylindrical body to be supported internally at the ends tliereof. As illustrated, a modified brush member 30 includes a cylindrical body 31 which has end portions 32 of relatively increased diameter. The end portions 32 carry bristle elements and the end faces thereof are formed with a respective recess 33 in which is located an outwardly projecting stub axle 34. A respective part-circular recess 16 is formed in tlie modified side walls II, and each recess 16 serves to locate an end cap 35 of generally dished shape, so as to enter the recess 33, with a central outwardly extending hollow bearing cup 36 in which the corresponding stub axle 34 is received. In this way the cylindrical body 31 is supported at its end while still being able to extend up to the side walls 11. In accordance with the invention, at each end of the cylindrical body 21,31. there is provided at least one bristle element 25 which is disposed immediately adjacent to the end of the cylindrical body, for example there may be two such end-most bristle elements at diametrally opposed positions. Deflector members 26 are provided at opposite ends of the brush member 20, 30 to engage said end-most bristle elements 25 and deflect fliem axially outwai-dlyas they travel through the aperture 13 as the brush member 20, 30 rotates. In the embodiments illusti"ated in figures 1 to 4, the deflector member 26 comprises a curved wire which is secured to the underside of the base plate 12, but it will be appreciated that the deflector member could be formed integrally with the base plate if desired. The arrangement is such that as the end-most bristle element 25 emerges from the aperture 13 it engages the laterally outer surface of tiie deflector member 26 and is thereby progressively deflected laterally outwardly so as to extend beneath, and preferably beyond, the adjacent side wall 11 as illustrated in Figures 2 and 4, To facilitate such deflection, the underside of the side wall 11 may be foimed with a recess 15 in register witli the end of tlie aperture 13, as shown most clearly in Figui-es 1 and 3. With the deflector member 26 as illustrated, the end-most bristle element 25 reaches its position of maximum deflection when it is in its lowest position during its rotary movement and then it is allowed to retract inwardly as the movement continues. During inward movement the end-most bristle element positively throws dust into the aperture 13. However, the deflector member may take other forms, and for example as illustrated in Figure 5 tlie deflector member 26a includes a straight central portion which maintains maximum deflection of the end-most bristle element 25 over a substantial portion of its travel across the aperture 13. in a further alternative airangement as shown in Figure 6, the deflector member 26b is of generally shallow V-shape, with unequal limbs, such that the end-most brisfle element is deflected more sliai-ply on its outward movement than on its return movement, with the consequence tiiat it engages the surface only during its inwai"d movement. In this way any tendency to throw dust outwardly is avoided. Wliilst the deflector member preferably extends fully across the width of the aperture 13, it will be understood that if desired it could terminate short of the edge of the aperture 13 at which the end-most bristle element 25 returns into the interior of the housing 10. Also, if desired, the housing could include a deflector element wliich serves positively to return the end-most brisfle element, as may be appropriate in the case of a bristle element consisting of relatively soft fibres with little inherent elasticity. The bristle elements may comprise groups of relatively rigid bristles which are sufficiently flexible and resilient to follow the shape of the deflector member, or groups of relatively softer and non-resilient fibres, or individual spikes of an appropriately flexible material, for example synthetic rubber. In the present specification "comprises" means "includes or consists of and "comprising" means "including or consisting of. The features disclosed in the foregoing description, or the following claims, or the accompanying drawings, expressed in their specific forms or in terms of a means for performing the disclosed function, or a method or process for attaining the disclosed result, as appropriate, may, separately, or in any combination of such features, be utilised for realising the invention in diverse forms thereof WE CLAIM: 1. A floor sweeping apparatus of the type having a rotary brush member, which in use is driven to rotate about a generally horizontal axis, the brush member having bristle elements that, as the member rotates, extend during part of their range of movement through an aperture in a base plate of a housing in which the rotary brush member is rotatably joumalled, wherein there is at least one bristle element, hereinafter called an end-most bristle element, arranged immediately adjacent to each end of said brush member, and characterised in that a deflector member is provided at each end of the aperture to co-operate with said end-most bristle element at the respective end of the brush member and deflect said end-most bristle element axially outwardly as said end-most bristle element extends through the aperture during the rotation of the brush member. 2.The floor sweeping apparatus according to claim 1 wherein_the lower edge of each side wall of the housing is formed with a recess in register with the end of the aperture. 3. The floor sweeping apparatus according to claim 1 wherein each deflector member comprises a guide wire of appropriate form which is arranged to extend across the respective aperture adjacent the end thereof 4. The floor sweeping apparatus according to claim 3 wherein each guide wire is of generally smoothly curved shape so that as, or immediately after, the respective end-most bristle element first extends through the respective aperture it contacts the guide wire and is smoothly deflected outwardly to reach maximum deflection at or slightly before its lowest point, and is then allowed to return in a manner controlled by the remainder of the guide wire. 5. The floor sweeping apparatus according to claim 3 wherein each guide wire is formed with a generally straight middle section and curved or angled end portions so that the respective end-most bristle element is maintained at substantially maximum deflection over most of its travel while extending through the aperture. 6. The floor sweeping apparatus according to claim 3 wherein each guide wire is V-shaped, with unequal limbs, such that the end-most bristle element is deflected more sharply on its outward movement than on its return movement 7. The floor sweeping apparatus according to claims 1 or 2 wherein the deflector member is formed integrally with the base plate of the housing. 8. Floor sweeping apparatus according to claims 1 or 2 wherein the deflector member does not extend across the entire width of the aperture. 9. Floor sweeping apparatus according to anyone of the preceding claims wherein the housing further includes a guide adjacent each edge of the aperture at which the end-most bristle elements pass back into the housing so as positively to return the bristle elements axially inwardly. 10. The floor sweeping apparatus according to anyone of the preceding claims wherein the rotary brush member is supported by bearings which engage it externally at positions spaced inwardly form its opposite ends. 11. The floor sweqiing apparatus according to claim 10 wherein the aperture is bridged at positions inset from the side walls by cross members which carry the bearings. 12. Floor sweeping ^paratus according to anyone of claims 1 to 9 wherein the rotary brush member is supported by intemal stub axles at the ends thereof received in bearing cups mounted in the side walls of the housing.

Documents:

in-pct-2002-0655-che claims.pdf

in-pct-2002-0655-che correspondence-others.pdf

in-pct-2002-0655-che correspondence-po.pdf

in-pct-2002-0655-che description (complete).pdf

in-pct-2002-0655-che drawings.pdf

in-pct-2002-0655-che form-1.pdf

in-pct-2002-0655-che form-19.pdf

in-pct-2002-0655-che form-26.pdf

in-pct-2002-0655-che form-3.pdf

in-pct-2002-0655-che form-4.pdf

in-pct-2002-0655-che form-5.pdf

in-pct-2002-0655-che pct.pdf

in-pct-2002-655-che-claims granted.tif

in-pct-2002-655-che-description (complete)granted.tif

in-pct-2002-655-che-drawings granted.tif