GB2151542A - Cutting tools - Google Patents

Abstract

A tool is for use on a casement- receiving rebate of a wooden window frame or a door-receiving rebate of a wooden door frame to cut away one rebate surface and simultaneously to cut a groove which extends around the rebate which is a continuation of said cut- away surface and which is for receiving a sealing member which overlies the cut-away surface. The tool comprises a rotatable cutter 17 and two pairs of guides 20, 21, the first pair of guides being for engaging two window frame surfaces in advance of the cutter, in the direction of travel thereof, to locate the cutter correctly to perform said cuts, and a second pair of guides for engaging two frame surfaces after the cutter, in cutter correctly to perform said cuts. The tool can be manually said direction of travel, to locate the movable to locate one or other of said pairs of guides in contact with the frame surfaces. In this way, the cuts can be continued right into and past all corners of the frame. <IMAGE>

Description

SPECIFICATION Cutting tools The invention relates to cutting tools.

According to the invention, there is provided a tool for use on a casement-receiving rebate of a wooden window frame or doorreceiving rebate of a wooden door frame to cut away one rebate surface and simultaneously to cut a groove which extends around the rebate which is a continuation of said cutaway surface and which is for receiving a sealing member which overlies the cut-away surface, the tool comprising a rotatable cutter and two pairs of guides, the first pair of guides being for engaging two frame surfaces in advance of the cutter, in the direction of travel thereof, to locate the cutter correctly to perform said cuts, and a second pair of guides for engaging two frame surfaces after the cutter, in said direction of travel, to locate the cutter correctly to perform said cuts, the tool being manually movable to locate one or other of said pairs of guides in contact with the frame surfaces.

Preferably the surfaces contacted by the guides are the two rebate surfaces.

In this case, the guides of each pair which contact the surface of the rebate which is not cut away, are formed by two flat surfaces lying in respective mutually inclined planes which are parallel to the axis of rotation of the cutter.

The angle between the planes of said guide surfaces may be 90= or substantially 90 .

The guides of each pair which contact the rebate surface which is cut away. are preferably formed by two flat surfaces which lie in planes which are mutually parallel and which are spaced by a distance equal to or substantially equal to the depth to which the cutter cuts away said surface.

Each pair of guides may be provided by two surfaces of an elongate block, the angle between said surfaces being equal or substantially equal to the angle of the rebate.

The cutter may be mounted on a front plate of the tool having two inclined edges meeting at an apex, the cutter projecting beyond both edges and the apex, and one of the pair of guides being associated with one edge and the other of the pair of guides being associated with the other edge, so that the tool can be turned to cut with one or other of the pairs of guides in contact with the rebate and with the cutter either leading or following the guide in contact with the frame.

The front plate may co-operate with a housing member to form a cavity which contains the cutter, a dust extraction outlet being provided leading from said cavity.

Where the tool is for use in a wooden window frame having a surface parallel to but spaced from the rebate surface which is cut away, the tool may be provided with a further guide for engaging said parallel surface to guide further the tool.

Where, in the window or door frame, said two parallel surfaces are connected by a flat connecting surface, a guide may be provided for bearing on said connecting surface.

The spacing between said front plate and said further guide may be adjustable for accommodating various spacings between said parallel frame surfaces.

The front plate is preferably generally triangular with the two edges having an inclination of 90 or substantially 90 and a handle being connected to the other edge.

A retractable eyelid is preferably provided for shielding the cutter when the cutter leads the guides.

The following is a more detailed description of one embodiment of the invention, by way of example, reference being made to the accompanying drawings in which: Figure 1 is a side elevation of a cutting tool in position on a casement-receiving rebate of a wooden window frame or a door-receiving rebate of a wooden door frame, Figure 2 is a perspective view of a part of the tool of Figure 1 showing a cutter, a front plate and guides, Figure 3 is a view from beneath of the part of the cutter shown in Figure 2, and Figure 4 is a diagrammatic view showing two operating positions of the tool of Figures 1 to 3.

Referring first to Figures 1 to 4, the tool comprises three generally triangular plates: a front plate 10. an intermediate plate 11 and a back plate 12, which are generally in register with one another and are connected together by parallel rods 13 (which are shown in Figure 1 but which are omitted for clarity in Figures 2 and 3). A flexible drive 14 passes through the back plate 12 and the intermediate plate 11 to connect to a shaft 15 which is mounted in bearings on the front and intermediate plates and which carries a rotatable cutter 17 located adjacent the front plate 10.

The flexible drive can be connected to any convenient power source to rotate the cutter at high speed. Alternatively, the power source (a compressor air or an electric motor) can be mounted on the tool itself.

A housing 16 is connected to the front plate 10 and forms, with the front plate, a cavity which partially surrounds the cutter and from which a dust outlet leads and is continued as a pipe passing through the other two plates 11, 12 for connection to a source of vacuum. An eyelid partially covers the cutter and is provided with a curved spring member at its leading edge.

The front plate 10 has two inclined edges 18, 19, meeting at a rounded apex. The cutter 17 projects beyond both edges and the apex, as best seen in Figure 2. A handle 19 is connected to the other edge of the front plate (see Figure 4).

The front plate 10 carries two guide blocks 20, 21. One guide block 20 is arranged adjacent one edge 18 of the front plate while the other guide block 21 is arranged adjacent the other edge 19. Each guide block 20, 21 has two guide surfaces 20a, 20b, 21a, 21b which are inclined relatively to one other at an angle determined by the configuration of the frame which they are to cut; in general, however, this angle will be a right angle. Each guide block has one surface 20a, 21a, which lies in a plane generally parallel to the axis of rotation of the cutter 17 with the planes of these two surfaces intersecting at right angles.

The other surfaces 20b, 21 b of the guide blocks 20, 21 lie in planes normal to the axis of the cutter 17 with the planes being spaced by a distance substantially equal to the width of the cutter 17 (and thus substantially equal to the width of the cut made by the cutter).

Thus the guide block 20 is narrower than the other guide block 21.

As best seen in Figure 3, the cutter shaft 15 is surrounded by a cylindrical guide 22 which is on a free running bearing and which is shaped for a purpose to be described in more detail below. The guide 22 is split to allow its removal from around the shaft 15 for replacement of the cutter to allow the typebf cutter used to be matched to the configuration of the frame being cut.

The intermediate plate 11 carries a guide plate 23 having a side surface generally parallel to the surfaces 20b, 21 b on the guide blocks 20, 21. The position of the intermediate plate 11 is adjustable on the rods 13 to allow adjustment of the guide plate 23. This adjustment may be by a rack-and-pinion type arrangement or by a simple lock screw.

Referring next to Figures 1 and 4, the tool is for use on a casement-receiving rebate 24 of a wooden window frame or a door-receiving rebate 24 of a wooden door frame. The rebate has two surfaces 25, 26 inclined at right angles and the cutter cuts away one rebate surface 25 as well as forming a groove 27 which extends around the rebate. The groove 27 is for receiving a sealing member (not shown) having a flange foot which extends into the groove and a sealing portion overlying the cut-away surface so that the depth occupied by the remainder of the frame and the sealing portion, when compressed by the casement or door does not exceed the depth of the frame before cutting of the rebate surface. The frame also has a side surface 28 parallel to the cut-away rebate surface and connected thereto by a flat connecting surface 29.In general, the frame will be rectangular with four corners, and the groove and rebate cut-away will extend all around the rectangular frame.

The difficulty to be overcome is to cut the groove and rebate continuously around the frame, including the corners.

The tool is brought to the frame and is placed on the frame with the front plate 10 and the guide plate 23 spanning the frame between the rebate surface 25 to be cut away and the side surface 28, with adjustment of the postiion of the intermediate plate 11 as necessary. The cylindrical guide 22 is brought into position in contact with the flat connecting surface 29 as cutting commences. The narrow guide block 20 is positioned in contact with the rebate surfaces 25, 26 so that the tool is position as shown in the right-hand side of Figure 4. The drive and the vacuum are then started and the cutter 17 rotated and the tool moved along the rebate 10 cuts away the rebate surface and to cut the groove. The sawdust and chips so created enter the cavity and are removed therefrom by the extraction system.

With the tool in this orientation, it is possible to cut the rebate surface and the groove up to and into one corner of the frame only.

In order to cut into the other corner, the tool is turned through 90 to the position shown in the left-hand side of Figure 4. In this position the wider guide block 21 contacts the already-cut rebate surface and since the difference between the two guide blocks 20, 21 is equal to the depth of the cut of the cutter 17, the tool remains correctly positioned and can cut into the other corner.

In this way a continuous cut can be made around the window or door frame prior to insertion of the sealing member. The cut can be made from within the property conerned without the need for removal of the windows and/or doors. Because of the extraction system, the cut can be made without dust or wood chips making a mess in the property.

Claims (14)

1. A tool for use on a closure-receiving rebate of a wooden window or door frame to cut a groove which extends continuously around the rebate and which is for receiving a sealing member, the tool comprising a rotatable cutter and two pairs of guides for respective engagement with the frame to guide the cutter in a required groove-cutting path around the rebate, one pair being inclined relatively to the other pair, so that the cutter can lead one pair of guides, which are in engagement with the frame to guide the cutter to cut a groove into a corner of a frame, the other pair of guides being out of engagement with the frame, the cutter then being pivotable so that the other pair of guides are engaged with the frame in advance of the cutter and the first-mentioned pair of guides are out of engagement with the frame to allow the cutter to continue the groove along the frame from the corner.

2. A tool according to claim 1, wherein the surfaces contacted by the guides of each pair are the rebate surfaces which are mutually at right angles.

3. A tool according to claim 2, wherein one guide of each pair is formed by a flat surface, and wherein said surfaces of the two pairs lie in respective planes which are mutually inclined relative to one another and which are parallel to the axis of rotation of the cutter.

4. A tool according to claim 3, wherein the angle between the said planes is 90 or substantially 90

5. A tool according to any one of claims 2 to 4 in which the cutter is for cutting away one rebate surface, the other guides of each pair contact said cut away rebate surface and formed by two flat surfaces which lie in planes which are mutually parallel and which are spaced by a distance equal to or substantially equal to the depth to which the cutter cuts away said surface.

6. A tool according to any one of claims 2 to 5, wherein each pair of guides are provided by two surfaces of an elongate block, the angle between said surfaces being equal or substantially equal to the angle of the rebate.

7. A tool according to any one of claims 1 to 6, wherein the cutter is mounted on a front plate of the tool having two inclined edges meeting at an apex, the cutter projecting beyond both edges and the apex at the apex, and one of the pair of guides being associated with one edge and the other of the pair of guides being associated with the other edge of the front plate, so that the tool can be turned to cut with one or other of the pairs of guides in contact with the rebate and with the cutter either leading or following the pair of guides in contact with the frame.

8. A tool according to claim 7, wherein the front plate co-operates with a housing member to form a cavity which contains the cutter, a dust extraction outlet being provided leading from said cavity.

9. A tool according to claim 7 or claim 8, wherein the front plate is generally triangular with the two edges having an inclination 90 or substantially 90 , and a handle being connected to the other edge.

10. A tool according to any one of claims 1 to 9 and for use in a wooden window frame having a frame surface lying in a plane parallel to the plane of the frame and parallel to but spaced from a rebate surface, the tool including a further guide for engaging said parallel surface to guide further said tool.

11. A tool according to claim 10, wherein the spacing between said front plate and said further guide is adjustable for accommodating various spacings between said parallel frame surfaces.

12. A tool according to any one of claims 1 to 11 and for use in a frame having a frame surface lying in a plane parallel to the plane of the frame and parallel to but spaced from a rebate surface, said two surfaces being connected by a flat connecting surface, the tool including a guide for bearing on said connecting surface.

13. A tool according to any one of claims 1 to 12, wherein a retractable eyelid is provided for shielding the cutter when the cutter leaves the guides.

14. A tool substantially as hereinbefore described with reference to the accompanying drawings.