Untitled record

Additional device for a motor-driven hand saw For motor-driven hand saws with a foot plate and a saw blade working transversely thereto, as they are used to carry out various kinds of work in the processing of wood, etc. used very often, it is not uncommon that a greater depth of cut is needed than by means of the normal saw blade and the given stroke can be achieved, for example, in the production of taps and the like. On lumber.

The innovation relates to an additional device for a motor-driven hand saw of the aforementioned type, which device, after replacement of the original saw blade of limited normal length by a special sheet of possibly multiple times, while maintaining the normal working depth to exceed the normal depth of cut by a multiple. It is characterized by a connectable with the handsaw branch legged support arm, one leg of which has alignment and fastening means to its releasable connection with the hand saw, and the other leg directed towards the free end of the long saw blade, adjustable support means carries the same.

The drawing illustrates an embodiment of the innovation, in which Fig. 1 illustrates a perspective side view of a normal handsaw alone.

Fig. 2 is a side view of the device and the means for its attachment to the normal saw shown in Fig. 1, and the lower end thereof to which it is connected, the upper part of the view of the section line 11-11 in Fig. 4 follows.

Fig. 3 shows the same arrangement as Fig. 2 in the front view and Fig. 4 in plan view, without the mechanical part of the hand saw. The illustrated in Fig. 1 normal handsaw has a foot plate 1, which served as a support against the material to be processed and perpendicular to the support surface eLn by the built-in handle designed as a motor housing 2 engine rectilinearly driven saw blade third The length of the toothed part of this saw blade corresponds to the maximum thickness of the normally processed material for which the handsaw is determined, ie the material thickness will in practice be slightly below the fixed lifting height of the saw blade. If the machine is occasionally used for a greater depth of cut, for example for cutting mortise and tenon lumber in Stäken, which exceed the working stroke of the machine, this can be achieved according to the innovation, the first the normal blade 3 by a special sheet is replaced by the multiple length of the sheet 3. For this purpose, the shafts of the two leaves are designed identically, so that the replacement of the leaves can be done easily.

Of course, the length of the special sheet 4 does not permit flying commissioning similar to the standard sheet according to FIG. 1; its free end 4 'must be supported against the pressure of work. For this purpose, a two-armed support arm 5 projecting towards the free end of the saw blade is provided on the machine, with a leg 5t extending parallel to the saw blade and a leg 5 "directed transversely thereto, in order to give the workpiece as much free passage as possible. At the end of the leg 5 ", a support roller 6 abutting against the back of the saw blade 4 is rotatably arranged, which receives the working pressure of the saw and stabilizes the passage of the saw 6. The roller 6 is rotatably mounted on a support 7, which is connected with a screw 8 Leg 5 is adjustably connected.

For the attachment of the support arms 5 on a normal handsaw, a holding plate 9 is provided as a carrier of the additional device. It is firmly connected to the leg 5 'of the support arm 5, for example by screws 10 (FIG. 4). As can be seen in Fig. 4, the holding plate 9 has a similar shape as the foot plate 1 of the normal hand saw (Fig. 1), only it is much longer and also wider than the latter, against which it rests in operation. Thus, the two plate-shaped parts 1 and 9 align themselves automatically when assembling and at the same time to fasten them together, special means are provided on the support plate 9. At the rear end of the retaining plate namely on each of two sides a material flap 11 is bent at right angles, such that they together form a guide for receiving the foot plate 1 Near the front end are also on both sides, symmetrically to its longitudinal central axis, two stop pins 12 with protruding head on attached to the holding plate 9, for example by riveting * Finally, the holding plate 9 carries at its rear end a clamping strap 13 and clamping screw 14, for which a threaded hole 15 is cut in the support arm 5.

When attaching the described additional device to a normal liandsäge, the latter needs to be placed only on the support plate 9 of the device so that the rear end of the foot plate 1 comes to rest in the above-described by the lateral straightening 11 guide after the clamping strap 13 was rotated by a quarter turn to the loosened clamping screw 14 free. Then the holding plate 9 is pushed back until the oblique edges of the two horns lot on the front part of the foot plate 1 under the protruding heads of the two pins 12 reach and are aligned and held in such a way. Then the clamping strap 13 is rotated back into its working position, ie 'strikes' her more distant end against the stop 16, after which the screw 14 is tightened. Then on the leg 5 "the carrier 7 is advanced with the support roller 6 to its contact with the back of the saw blade 4 and then secured by tightening the screw 8. Now the handsaw with the additional device is ready.