GB2204528A

GB2204528A - Guide shoe for electric tools

Info

Publication number: GB2204528A
Application number: GB08808851A
Authority: GB
Inventors: Hermann Frey; Klaus Meyer
Original assignee: Karl M Reich Maschinenfabrik GmbH
Current assignee: Karl M Reich Maschinenfabrik GmbH
Priority date: 1987-05-11
Filing date: 1988-04-14
Publication date: 1988-11-16
Anticipated expiration: 2008-04-14
Also published as: FR2615139B3; GB8808851D0; GB2204528B; FR2615139A3

Abstract

Guide shoe 6 for electric tools 2, includes at least one bore 10 for receiving therein a retaining bar 4 of the tool 2 and a guide channel 7 into which engages a guide rib 8 of a guide rail 9 which can be placed on the workpiece 3 along which the tool is guided to work on the workpiece, characterised in that the shoe 6 has-a second guide channel 13 parallel with the first channel 7. The tool 2 slides on the rail 9. The shoe can be reversed to allow channel 13 instead to engage the rib 8 while the tool 2 slides directly on the workpiece 3. The channels 7, 13 are mutually off set. The shoe 6 may alternatively include a single channel and mutually off set bores to receive bars 4 whereby the tool slides on the rail or on the workpiece depending upon which bores are used. The shoe may threadedly receive a depth adjusting compass insert, and circular grooves can be cut. The shoe can be connected to a cam abutment to guide cutter 1 along outer contours of workpiece. The rail includes stops lockable in position on the rib 8. <IMAGE>

Description

Guide Shoe for Electric Tools The is ention relates to a guide shoe for electric tools.

Where electric tools are concerned, particularly in the case of routing machines, it is known to fix on the retaining rods for the longitudinal abutment a guide shoe which has a guide channel into which engages a guide rib of a guide rail which can be placed on the workpiece. The routing machine is displaced on the guide rail and it is possible to cut straight grooves.

There is a relatively large gap between guide rib and milling cutter so that there is no reliable guidance of the routing machine and it is possible adversely to affect the straight run of the milled groove.

Therefore, the object of the present innovation is to provide a guide shoe which does ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ guarantee reliable guidance and with which it is possible to perform other operations than just rectilinear displacement.

According to the innovation, we provide a guide shoe for electric tools, having at least one receiving bore into which it is possible to insert a retaining bar of the electric tool and having a guide channel into which engages a guide rib of a guide rail which can be placed on the workpiece, characterised in that the guide shoe is provided with a second guide channel parallel with the first guide channel.

In the case of the embodiment according to the innovation, which has two guide channels or mutually offset receiving bores, it is possible to use the routing machine not only in such a way that it slides on the guide rail, in which case a relatively large gap is present between the milling cutter and the guide rib Instead, the guide shoe can also be so reversed that the routing machine can be displaced while resting directly on the workpiece, the gap between milling cutter and guide rib being considerably reduced. Thus there is a reliable guidance of the routing machine which is further improved in that the entire base plate of the routing machine rests on the workpiece.

Connecting the guide shoe to a cam abutment or to a compass insert, in accordance with the sub-claims, provides the widening of the range of application of the guide shoe since, in conjunction with the routing machine, it makes it possible to cut workpieces having an arcuate outer contour, or circular grooves.

The guide shoe according to the innovation can also be advantageously used with padsaws and other electric tools.

Examples of embodiment of the innovation are described in greater detail hereinafter with reference to the accompanying drawings5 in which: Fig. 1 shows the guide shoe in a first application.

Section taken on the line I - I in Fig. 3.

Fig. 2 shows the guide shoe in a second application, viewed from the front.

Fig. 3 shows the guide shoe from the side.

Fig. 4 shows the guide shoe from the side, with a cam abutment.

Fig. 5 shows the guide shoe from above, with a cam abutment.

Fig. 6 shows the guide shoe with a compass insert, in median section.

Fig. 7 shows a second example of embodiment of the guide shoe, from the front.

Fig. 8 shows a further example of embodiment of the guide shoe and Fig. 9 shows a section taken on the line A-A in Fig. 8.

In the case of the first example of application shown in Fig. 1, it is intended to use the milling cutter 1 of a routing machine 2 to cut a straight slot in a workpiece 3. For this purpose, there is pushed onto the two retaining rods 4 which are adjustably mounted on the base plate 5, a guide shoe 6 the first guide channel 7 of which is engaged by a guide rib 3. This guide rib 8 is part of a guide rail 9 which rests in known manner on the workpiece 3. Upon displacement of the routing machine 2, its base plate 5 slides on the guide rail 9 and is guided on the guide rib 8 via the guide shoe 6.

As Fig. 3 also shows, the guide shoe 2 has receiving bores 10 which are open at the top on both their sides, their middle portion being bridged by a web 11. Disposed in this web 11 is a fixing screw 12 by which the guide shoe 6 can be clamped securely on the retaining bars 4.

In the case of a second example of application of the innovation, according to Fig. 2, a second guide channel 13 in conjunction with the guide rib 8 serves to guide the routing machine. However, the routing tool is directly alongside the guide rib 8 and its base plate 5 slides directly on the surface of the workpiece 3. Thus, the gap between the milling cutter 1 and the guide rib 8 will be substantially reduced, which will result in improved guidance of the routing machine 2.

The guide shoe 6 has two bottom surfaces 14 and 15 which are offset at right angles to each other so that they have a parallel step 16. Correspondingly, the two guide channels 7 and 13 are offset to each other at right angles to the bottom surfaces 14, 15. Where this example of application is concerned, the bottom surface 14 of the guide shoe 6 slides directly on the surface of the workpiece 3, while the bottom surface 15 rests on the surface of the guide rail.9.

With this example of embodiment, the retaining bars 4 likewise extend through the receiving bores 10, but only as far as the guide rib 8 and are again secured by fixing screws 12.

As a further example of application, Figs. 4 and 5 show the connection of the guide shoe 6 to a cam abutment 17.

For this, there is disposed above the centre of the guide shoe 6 a screw threaded plate 13 which is connected by webs 19 to the bottom plate 20 of the guide shoe. Under the threaded plate 18 there is in the bottom plate 20 an aperture 21 and the threaded plate 18 is provided with a downwardly directed depression 22.

The cam abutment 17 comprises two fixing eyes 23 which engage the guide channel 13. A further fixing eye 24 with a threaded insert 25 engages the depression 22. By screwing a fixing screw into the threaded insert 25, the cam abutment 17 is securely connected to the guide shoe 6. The cam abutment 17 has in known manner two contact faces 27 by which the milling cutter 1 can be guided along the curved outer contour 28 of the workpiece.

In the case of a further example of application of the innovation, according to Fig. 6, there is screwed into the threaded plate 18 of guide shoe 6 a compass insert 29, of which the compass tip 30 is intended to be applied against the workpiece 3. The compass insert 29 can be adjusted to the required depth by being rotated. It can then be locked by a counter nut 31. The routing machine 2 can again be connected to the guide shoe 6 by means of its retaining bars 4 and after the compass tip 30 has been applied to the workpiece 3, circular grooves can be cut. For accurate application of the compass point 30, this latter can be seen from above through the aperture 21.

Fig. 7 shows a second example of embodiment of the innovation.

In this case, the guide shoe 32 is provided with only one guide channel 33. However, it does have at least two oppositely disposed receiving bores 34 and 35 which serve to accommodate the retaining bars 4.

If, now, according to the first example of application, the routing machine is to slide on the guide rail, then the retaining bars are fitted into the rightwardly directed receiving bores 34 and again clamped securely by fixing screws 12.

In the case of the second application, the retaining bars 4 are fitted into receiving bore 35 and the bottom plate 5 thus slides directly on the surface of the workpiece 3. This guide shoe 32, also, can comprise a step 36.

In the case of a further example of embodiment according to Figs. 8 and 9, the guide rail 9 is provided with stirrup-shaped stops 37 which are displaceable and lockable in position on the guide rib 8. The stirrup-shaped stops 37 engage around the guide rib 8 and can be clamped securely by means of a wing nut 38.

If, now, the guide shoe 6 is placed on the guide rail 9 between the stirrup-shaped stops 37, then these latter serve as an abutment for the guide shoe 6 and it is possible to use the routing machine 2 for producing for instance stopped slots in pieces of furniture.

To generate the exact dimensions of these slots, the guide rib 8 can be provided on top with a measuring scale 39 so that the stops 37 can be adjusted to the desired dimension.

Claims

CLAIMS:

1. Guide shoe for electric tools, having at least one receiving bore into which it is possible to insert a retaining bar of the electric tool and having a guide chunnel into which engages a guide rib of a guide rail which can be placed on the workpiece, characterised in that the guide shoe (6) is provided with a second guide channel (13) parallel with the first guide channel (7).

2. Guide shoe according to Claim 1, characterised in that the guide channels (7, 13) are staggered in respect of each other and are at right angles to the bottom surface (14, 15).

3. Guide shoe according to Claim 2, characterised in that the bottom surface (14, 15) has a step (16) parallel with the direction of displacement.

4. Guide shoe for electric tools comprising at least one receiving bore into which it is possible to insert a retaining bar of the electric tool and which comprises a guide channel into which engages a guide rib on a guide rail which can be placed on the workpiece, characterised in that the guide shoe (32) has at least two receiving bores (34, 35) which are offset to each other, on opposite sides of the guide rail (32).

5. Guide shoe according to one of Claims 1 to 4, characterised in that the guide shoe (6) can be connected to a cam abutment (17) which has two spaced apart contact faces (27).

6. Guide shoe according to Claim 5, characterised in that the cam abutment (17) is provided with fixing eyes (23, 24) which engage into depressions (13, 22) in the guide shoe (6).

7. Guide shoe according to one of Claims 1 to 6, characterised in that the guide shoe (6) can be connected to a compass insert (29).

8. Guide shoe according to Claim 7, characterised in that the compass insert (29) can be screwed into and then locked in the guide shoe (6).

9. Guide shoe according to Claim 7 or 8, characterised in that the guide shoe (6) comprises an aperture iZ1) through which it is possible to see the compass point (30) from above.

10. Guide shoe according to one of Claims 1 to 4, characterised in that the guide rail (9) is provided with stirrup-shaped stops (37) which are mounted for displacement and can be locked in position on the guide rib (3).

11. Guide shoe according to Claim 10, characterised in that a measuring scale (39) is provided on the top of the guide rib (S).