GB1575838A

GB1575838A - Multiple angle saw guide

Info

Publication number: GB1575838A
Application number: GB875877A
Authority: GB
Original assignee: Individual
Current assignee: Individual
Priority date: 1978-05-25
Filing date: 1978-05-25
Publication date: 1980-10-01

Description

(54) A MULTIPLE ANGLE SAW GUIDE (71) I, EDWARD FREEMAN, a British subject of The Croft, 5 The Drive, Greatham, Hartlepool, Cleveland, do hereby declare the invention, for which I pray that a patent may be granted to me, and the method by which it is to be performed to be particularly described in and by the following statement-: This invention relates to a multiple angle saw guide.

Known saw guides rely on templates which are cut to the required angles or which, at best, are adjustable to a series of angles but in one direction only. The known saw guides can only be adjusted horizontally but as a natural course they always cut vertically. Even although the saw cuts are done with the aid of a template, the finish of the cut depends largely upon the skill of the operator.

A further major disadvantage in using a template arises from the fact that saw teeth are set such that the saw blade is narrower than the set of the teeth. The template must therefore be made wide enough to accommodate the teeth and, consequently, when the saw is in the groove of the template, it tends to wobble. With use, the template grooves get bigger and substantial inaccuracies in saw cuts can soon result.

Nylon lined templates have been proposed but friction occurs between the nylon lining and the templates and the templates do not give particularly well finished saw cuts.

It is an aim of the present invention to provide a multiple angle saw guide which is not subject to the above mentioned disadvantages of the known saw guides.

Accordingly, this invention provides a multiple angle saw guide comprising a base, a first member which is upstanding with respect to the base and which can pivot in a multiplicity of directions with respect to the base, locking means for locking the first member in a fixed angular position with respect to the base, a second member which is slidably fixed to the first member such that the second member can move backwards and forwards across and along the first member, and means for attaching a saw to the second member.

Preferably, the first member pivots with respect to the base by means of a ball and socket joint. However, if desired, other pivotting arrangements may be employed such for example as a universal joint. With a ball and socket joint, the first member can advantageously terminate in the ball and the base can then be provided with the socket. Obviously the reverse arrangement could be employed in which the socket is on the first member and the ball is on the base.

Various types of locking means can be employed for locking the first member in its desired angular position. By way of example, it is mentioned that a screw clamp device may be employed. With a ball and socket joint, the locking means, for example the screw clamp, can be attached to the socket part of the joint to tighten the socket on the ball when it is desired to prevent relative movement between the ball and the socket.

The first member may be an elongate member having a closed longitudinal slot along its length. The second member may also be an elongate member having a closed longitudinal slot along its length.

The second member can then be slidably fixed to the first member by means of a reciprocatable connecting arrangement.

The means for attaching the saw to the second member may comprise a pair of spaced apart lugs that depend from the second member and that have recesses for receiving the upper part of the saw. The saw can be held in the recesses by screws, nuts and bolts or other fixing means as desired.

Preferably the base is provided with a cutting fence.

The saw guide of the invention can be made from various materials. Thus, for example, the base can be made in two parts with a thin metal base plate having a thicker wooden platform positioned thereon. The first and second members can be made of wood, metal or a rigid plastics material. The locking means can be made of metal or a plastics material.

An embodiment of the invention will now be described solely by way of example with reference to the accompanying drawings in which: Figure 1 is a perspective view of a multiple angle saw guide in accordance with the invention; Figure 2 is an end view of the top part of the saw guide shown in Figure 1; and Figure 3 is an exploded view showing the reciprocatable connecting arrangement of the saw guide shown in Figure 1.

Referring to the drawings, there is shown a multiple angle saw guide 2 comprising a base 4 made of a thin steel plate 6 having a thicker wood platform 8 positioned on top of it. The platform 8 is provided with a cutting fence 10 as shown.

A first elongate member 12 is upstanding from the base 4, the member 12 having a closed elongate slot 14 and a shank 16 of reduced thickness. The shank 16 is joined to a ball 18 which fits in a socket 20 provided on the plate 6, the ball 18 and the socket 20 forming a ball and socket joint which enables the member 12 to pivot in substantially all directions with regard to the base 4.

The socket 20 is provided with locking means in the form of a screw clamp 22 for locking the socket 20 onto the ball 18 to hold the member 12 in any desired angular position. The screw clamp 22 comprises two lugs 24, 26 which are formed as extensions of the socket 20 and which are adapted to be drawn together to clamp the socket 20 about the ball 18 by means of a screw 28 which is rotated by a handle 30.

A second elongate member 32 having a closed elongate slot 33 is slidably fixed to the first elongate member 12 such that the member 32 can move backwards and forwards across the member 12 in the direction of the arrows 34, 36, and can also move up and down along the member 12 in the direction of the arrows 38, 40.

Combinations of movement in the direction of the arrows 34, 36, 38, 40 can also be achieved.

The movement of the members 12, 32 with respect to each other is enabled by a reciprocatable connecting arrangement 42.

The reciprocatable connecting arrangement 42 comprises a block 44 which is positioned in the slot 14 and a block 46 which is positioned in the slot 33. The blocks 44, 46 are held in position by a bolt 48 having a head 50 and two lock nuts 52, 54. A bush 56 is provided on the bolt 48 and this bush 56 keeps the members 12, 32 spaced apart as desired. A washer 58 is positioned between the nut 52 and the member 12 and a washer 60 is positioned between the bolt head 50 and the member 32. The assembled reciprocatable connecting arrangement 42 allows the above mentioned movement in the direction of the arrows, 34, 36 and 38, 40.

The member 32 is provided with a pair of depending lugs 64, 66. As shown in Figure 1, the lugs 64, 66 are each in two parts having a first lug part 68, 70 formed integrally with the member 32 and a second lug part 72, 74 which is mortised and tenonned to the first lug part 68, 70 as shown most clearly in Figure 2. The joint between the lug parts 68, 72 and 70, 74 is then held in position by nut and bolt arrangements 75, 77. The second lug parts 72, 74 are provided with recesses 76, 78 respectively for receiving the top portion 80 of a saw 82 having a blade 84 and a handle 86. The top portion 80 of the saw 82 is secured in position in the recesses 76, 80 by means of screws 88, 90.

A cut can be made at a desired angle in a piece of wood or other material placed on the base 4. The member 12 is first set to the desired angle and then sawing can be commenced with the saw 82 going generally backwards and forwards in the direction of the arrows 34, 36. The usual "see-saw" motion often necessary when sawing can be achieved because the block 44 allows up and down movement in the direction of the arrows 38, 40 and the saw 82 can also pivot about the shaft 54.

Although not shown, the blocks 44, 46 are advantageously provided with bearings, for example ball or roller bearings, to promote easy running in the slots 14, 33. The saw guide 2 can also be used to cut double angles in one setting and there are no restrictive guides as in templates.

It is to be appreciated that the embodiment of the invention described above has been given by way of example only and that modifications may be effected. Thus, for example, the block 44 could be shaped differently than is shown in Figure 3 and it could run in a guide path on the outside of the member 12.

Similarly, the slot 33 in the member 32 could be replaced by a guide path on the outside of the member 32. Further, if desired, the saw guide 2 could be provided with an angle degree scale, for example a curved scale positioned on the base 4 and adapted to be read using the bottom part of the member 12 as an indicator.

WHAT I CLAIM IS: 1. A multiple angle saw guide comprising a base, a first member which is upstanding with respect to the base and which can pivot in a multiplicity of directions with respect to the base, locking means for locking the first member in a fixed angular position with respect to the base, a second member which is slidably fixed to the first

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. of metal or a plastics material. An embodiment of the invention will now be described solely by way of example with reference to the accompanying drawings in which: Figure 1 is a perspective view of a multiple angle saw guide in accordance with the invention; Figure 2 is an end view of the top part of the saw guide shown in Figure 1; and Figure 3 is an exploded view showing the reciprocatable connecting arrangement of the saw guide shown in Figure 1. Referring to the drawings, there is shown a multiple angle saw guide 2 comprising a base 4 made of a thin steel plate 6 having a thicker wood platform 8 positioned on top of it. The platform 8 is provided with a cutting fence 10 as shown. A first elongate member 12 is upstanding from the base 4, the member 12 having a closed elongate slot 14 and a shank 16 of reduced thickness. The shank 16 is joined to a ball 18 which fits in a socket 20 provided on the plate 6, the ball 18 and the socket 20 forming a ball and socket joint which enables the member 12 to pivot in substantially all directions with regard to the base 4. The socket 20 is provided with locking means in the form of a screw clamp 22 for locking the socket 20 onto the ball 18 to hold the member 12 in any desired angular position. The screw clamp 22 comprises two lugs 24, 26 which are formed as extensions of the socket 20 and which are adapted to be drawn together to clamp the socket 20 about the ball 18 by means of a screw 28 which is rotated by a handle 30. A second elongate member 32 having a closed elongate slot 33 is slidably fixed to the first elongate member 12 such that the member 32 can move backwards and forwards across the member 12 in the direction of the arrows 34, 36, and can also move up and down along the member 12 in the direction of the arrows 38, 40. Combinations of movement in the direction of the arrows 34, 36, 38, 40 can also be achieved. The movement of the members 12, 32 with respect to each other is enabled by a reciprocatable connecting arrangement 42. The reciprocatable connecting arrangement 42 comprises a block 44 which is positioned in the slot 14 and a block 46 which is positioned in the slot 33. The blocks 44, 46 are held in position by a bolt 48 having a head 50 and two lock nuts 52, 54. A bush 56 is provided on the bolt 48 and this bush 56 keeps the members 12, 32 spaced apart as desired. A washer 58 is positioned between the nut 52 and the member 12 and a washer 60 is positioned between the bolt head 50 and the member 32. The assembled reciprocatable connecting arrangement 42 allows the above mentioned movement in the direction of the arrows, 34, 36 and 38, 40. The member 32 is provided with a pair of depending lugs 64, 66. As shown in Figure 1, the lugs 64, 66 are each in two parts having a first lug part 68, 70 formed integrally with the member 32 and a second lug part 72, 74 which is mortised and tenonned to the first lug part 68, 70 as shown most clearly in Figure 2. The joint between the lug parts 68, 72 and 70, 74 is then held in position by nut and bolt arrangements 75, 77. The second lug parts 72, 74 are provided with recesses 76, 78 respectively for receiving the top portion 80 of a saw 82 having a blade 84 and a handle 86. The top portion 80 of the saw 82 is secured in position in the recesses 76, 80 by means of screws 88, 90. A cut can be made at a desired angle in a piece of wood or other material placed on the base 4. The member 12 is first set to the desired angle and then sawing can be commenced with the saw 82 going generally backwards and forwards in the direction of the arrows 34, 36. The usual "see-saw" motion often necessary when sawing can be achieved because the block 44 allows up and down movement in the direction of the arrows 38, 40 and the saw 82 can also pivot about the shaft 54. Although not shown, the blocks 44, 46 are advantageously provided with bearings, for example ball or roller bearings, to promote easy running in the slots 14, 33. The saw guide 2 can also be used to cut double angles in one setting and there are no restrictive guides as in templates. It is to be appreciated that the embodiment of the invention described above has been given by way of example only and that modifications may be effected. Thus, for example, the block 44 could be shaped differently than is shown in Figure 3 and it could run in a guide path on the outside of the member 12. Similarly, the slot 33 in the member 32 could be replaced by a guide path on the outside of the member 32. Further, if desired, the saw guide 2 could be provided with an angle degree scale, for example a curved scale positioned on the base 4 and adapted to be read using the bottom part of the member 12 as an indicator. WHAT I CLAIM IS:

1. A multiple angle saw guide comprising a base, a first member which is upstanding with respect to the base and which can pivot in a multiplicity of directions with respect to the base, locking means for locking the first member in a fixed angular position with respect to the base, a second member which is slidably fixed to the first

member such that the second member can move backwards and forwards across and along the first member, and means for attaching a saw to the second member.

2. A saw guide according to claim 1 in which the first member pivots with respect to the base by means of a ball and socket joint.

3. A saw guide according to claim 1 or claim 2 in which the locking means is a screw clamp device.

4. A saw guide according to any one of the preceding claims in which the first member is an elongate member having a closed longitudinal slot along its length.

5. A saw guide according to any one of the preceding claims in which the second member is an elongate member having a closed longitudinal slot along its length.

6. A saw guide according to claims 4 and 5 in which the second member is slid ably fixed to the first member by means of a reciprocatable connecting arrangement.

7. A saw guide according to any one of the preceding claims in which the means for attaching the saw to the second member comprises a pair of spaced apart lugs that depend from the second member and that have recesses for receiving the upper part of the saw.

8. A saw guide according to any one of the preceding claims in which the base is provided with a cutting fence.

9. A multiple angle saw guide substantially as herein described with reference to the accompanying drawings.