GB2074062A

GB2074062A - Hand operated abrader

Info

Publication number: GB2074062A
Application number: GB8040312A
Authority: GB
Original assignee: Trenchbond Ltd
Current assignee: Trenchbond Ltd
Priority date: 1980-04-11
Filing date: 1980-12-17
Publication date: 1981-10-28

Abstract

A device for holding abrasive material for use in abraiding operations performed by hand. The device comprising a block member (2) and a handle member (4) which are clamped together. Abrasive material is folded around the block member and held by its periphery between the block member and the handle member. The handle member is shaped for holding in the hand and is capable of being clamped in any desired angular position with respect to the block member. <IMAGE>

Description

SPECIFICATION A hand operated abrasion device This invention concerns a device for holding abrasive material.

It is usual practice in abraiding operations performed by hand, using abrasive paper, i.e. Glass Paper, to fold a sheet of the abrasive material around a rectangular block, usually wood, which is dimensioned to permit ease of handling. The block conveniently has a flat surface which serves to support the abrasive material when in use. The paper is retained solely by the grip of the user. Such an arrangement has a disadvantage in that the abrasive material cannot be rigidly and constantly held in place and in that both hands of the user are not completely free to guide and apply weight to the said block. Hence such operation is more tiring and less efficient than is desirable and than is achieved by the preferred embodiment of the present invention.

Previously to this invention a device has been proposed which purports to overcome the said disadvantage, which comprises a plastics handle and a separate shaped and flanged abrasive material which material is resilientlyfitted to the handle. The need to use proprietory shaped and flanged abrasive materials with the handle is undesirable since the cheaper and more readily available sheet materials on the market cannot be used in such a device.

An object of the present invention is to provide a device for holding abrasive material which overcomes the above mentioned disadvantage and which allows the use of abrasive material readily available in standard sheet form.

According to the present invention there is provided a hand operated device for holding abrasive material comprising a block member for supporting the abrasive material, a handle member and clamping means for securing together the handle member and the block member in a chosen angular relation.

Preferably the handle member is made from wood and is shaped for ease of holding having longitudinal grooves along opposing edges.

Conveniently the block member is rectangular having planer faces and, in use, the abrasive material is folded around the block member and is clamped by it's periphery between adjacent faces of the block member and the handle member.

In the prefered embodiment the clamping means comprises a bolt and nut which threadingly interengage to clamp the two members together.

In a particular embodiment, the block member is provided with a pair of projections which engage in corresponding recesses in the handle member. The projection and recesses serve to fix the angular position of the two members with respect to each other. A number of pairs of recesses and conveniently provided in the handle member to facilitate location of the handle member in a number of angular positions.

In a further envisaged embodiment of this invention the abrasive material is secured to the block member by adhesive. Preferably the abrasive material has an adhesive backing.

The present invention will now be described further, by way of example only, with reference to the accompanying drawings, in which Figure lisa perspective assembly view of a prefered embodiment of such a device for holding abrasive material and Figure 2 is a perspective view of the components making up the assembly of Figure 1.

The illustrated embodiment of the device comprises a block member (2) which carries the abrasive material and a handle member (4) which is secured to the block member (2). The block member has planar faces is of rectangular configuration and is conveniently made of wood. It will be appreciated that the faces need not necessarily be planar, the block member need not be rectangular and any other suitable material may be chosen.

A shaft (6) is upstanding from a face (8) disposed opposite to a face (10) which in use supports the abrasive material. Conveniently the shaft (6) is a carriage bolt which is received in a bore (12) formed in the block member (2). A counterbore is formed adjacent to the material supporting surface (10) of the block, which counterbore receives the head of the bolt (6).

A nut and washer (not illustrated) may be threaded onto the shank of the bolt and received in a further counterbore (not illustrated) disposed in the face (8) of the block member. By means of the said nut the bolt (6) may be held axially and angularly fixed.

The handle member (4) may be a simple rectangular block or as illustrated is preferably provided with grooves (22) along its length and with rounded ends.

As an alternative one or both of these grooves may be replaced by recesses for the finger. The handle member has a through bore (18) and a larger diameter counterbore (20) coaxial with the bore (18) which said counterbore is formed in the face (26) remote from the block member (2).

On assembly the shaft (6) is received in the bore (18) and athreaded member (16) is fitted onto the shaft and is received in the counterbore (20) such that the handle member is clamped to the block member (2). Thus the handle member may be secured to the block member at any variable angle within the range 0 to 360".

In the preferred embodiment illustrated a sheet of abrasive material (22) is folded around the block member )2) so that the periphery or at least a part of the periphery of the sheet material is disposed between the face (8) of the block member and the face (27) of the handle member. Tightening of the threaded member secures the handle in the desired position and at the same time secures the abrasive sheet material.

In an alternative envisaged embodiment of this invention the abrasive sheet material is secured to the face (10) of the block member (2) by adhesive and the clamping means in the form of the bolt and threaded member serves to locate the handle in any desired angular position with respect to the block.

The abrasive sheet material may have an adhesive backing or double sided adhesive tape may be used to adhere the abrasive material up the block member.

Whilst the invention has been described with reference to a particular type of clamping means (the bolt and threaded member), it will be appreciated that other equally suitable clamping means may be used. For example a quick cam type arrangement may be used instead of the threaded bolt, or alternatively some form of click fit arrangement may be employed.

As illustrated the corners of the abrasive material are cut to facilitate fitting to the block member. As an alternative the corners may be folded.

Claims

1. A device for holding abrasive material comprising a block member for supporting the abrasive material, a handle member and clamping means for securing together the handle member and block member at any desired relative angular disposition between the said members in general, but not so as to preclude the particular claims No. 7 and No. 8 hereafter claimed.

2. A device as claimed in Claim 1 in which the block member is of rectangular configuration having planar faces and the handle member has at least one planar face which is urged towards a corresponding face of the block member by the clamping means.

3. A device as claimed in Claim 1 or 2 in which the handle member has recesses or grooves so shaped as to permit ease of holding.

4. A device as claimed in any preceding claim in which the clamping means comprises a nut or wing nut and bolt.

5. A device as claimed in any of Claims 1 to 3 in which the clamping means comprises a bolt which is received in a bore in the block member and which threadingly engages through a bore in the handle member in a nut retaining the handle member.

6. A prefered device as claimed in claim 5 in which the bolt head is received in a counterbore in the block face adjacent to the abrasive material and in which the nut is received in a counterbore in the handle face opposite the plane of contact of block member and handle member.

7. A device as claimed in any preceding claim in which the block member or the handle member carries at least one upstanding projection which engages in a corresponding recess formed in the other of the handle or block members, which projection and recess serves to determine the angular relation between the block member and the handle member.

8. A device as claimed in Claim 7 in which a plurality of recesses are provided so that the handle may be secured in a number of prefered angular positions.

9. A device as claimed in any preceding claim in which the abrasive material is folded around the block member and is clamped by corresponding opposite sectors of its periphery between adjacent surfaces of the block member and the handle member for any angular disposition between the said block member and the said handle member.

10. A device as claimed in any preceding claim in which the abrasive material is secured to the block member by adhesive.

11. A device constructed and arranged substantially as hereinbefore described with reference to and as illustrated in the accompanying Drawings and in which the abrasive material is clamped by its entire periphery between the block member and the handle member.

12. A device as claimed in Claim 10 in which the adhesive material has an adhesive backing.

13. A device as claimed in any preceding claim in which the handle and block members can be clamped together or slackened apart only to an extent governed by the unclamped setting of the said clamping means.

14. A device as claimed in Claim 13 in which the handle and the block members can be clamped together or slackened apart to an extent governed by the permitted travel of the nut along the bolt.

15. A device as claimed in any preceding claim in which the nut, subsequent to engagement by the bolt cannot then be removed from the bolt.

16. A device as claimed in any preceding claim in which the abrasive material supported by the block member offers at least three sanding surfaces supported firstly by the major face of the block member opposite to the plane of contact between the block member and the handle member and secondly by the minor faces of the block member perpendiculorto the said major face of the block member.

17. A device as claimed in any of Claims 3 to 16 inclusive in which the block member has one ore more non-planar faces and at least one planar face in planar contact with the planar face of the handle member.

New claims or amendments to claims filed on 7.7.81 Superseded claims 1 to 15 and 17 New or amended claims:

1. Atwo-handed device for holding abrasive material comprising a block member supporting the said material, a handle member and a means clamping the said members and the said abrasive material together in which the abrasive material, so supported, is disposed entirely between the hands of the operator.

2. A device as claimed in Claim 1. in which the equal and opposite leverages exerted by each such aforesaid hand upon the block-member through the handle-member afford mechanical advantage to the operator.

3. A device as claimed in Claims 1 or 2 in which the handle-member has one or more pairs of finger grooves parallel to its longitudinal axis, each groove in such a pair being disposed on opposite sides of the said axis.

4. A device as claimed in any preceding claim in which each part of the surface area of the handlemember not in contact with the block member has a radius of curvature in one dimension or in two dimensions, to facilitate the grip of the operator.

5. A device as claimed in any preceding claim in which, for any particular angular disposition between the aforesaid members, the longitudinal aixs of the handle member does not intersect the plane of contact of the said members.

6. A device as claimed in any preceding claim in which the planar bottom face of the handle member is of substantially greater length than the planar top face of the block member.

7. A device as claimed in Claim 6 in which, for any particular angular disposition between the longitudinal axes of the aforesaid members, the minor faces of the block member are accurately perpendicuiar to the planar bottom face of the handle member.

8. A device as claimed in any preceding claim in which, for any particular aforesaid angular disposition, a substantial proportion of the planar bottom face of the handle member is free to abut the face of a flat workpiece and hence to urge one of the long minor faces of the block member against the edge of the said workpiece, and thereby procure sanding of such edge of such workpiece at right angles to the said face of that workpiece.

9. A device as claimed in any preceding claim in which the abrasive material supported by the block member offers at least three sanding surfaces supported firstly by the major face of the block member opposite to the plane of contact between the block member and the handle member and secondly by the minor faces of the block member perpendicular to the said major face of the block member.