DE218622C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

-JVI 218622- CLASS Te. GROUP

KRAFT & CO. in HOHENLIMBURG i.Westf.

Method and device for the production of shoe oarlocks.

Patented in the German Empire on September 6, 1908.

So far, shoe oarlocks, which serve as a replacement for shoe nails and are used in particular in military, work and mountain shoes, have been made from shaping or profile wire that has been cut and bent to the desired length. The profile wires are made by drawing. The production of the wires according to the known drawing process offers extraordinary difficulties in that the thin, peculiarly shaped profile is very difficult to work into the drawing iron, which can easily be seen when looking at the finished piece of wire, as shown in FIG. It seems appropriate to go into more detail here on how the profile is worked into the drawing dies. For this purpose, after a narrow slot has been worked into the piece of steel in question, steel punches of the shape that the finished piece of wire should have afterwards. Of course, a number of copies are required for this, starting from one copy that is kept slim to the last one, which gives the final profile. On the one hand, the punctures are very difficult to produce for the present profile, because during hardening, tearing very easily takes place at the central incision point. Furthermore, the copies warp extremely easily during hardening. If, now, which happens very easily, one of the punches used for driving breaks while the profile has not yet been completely completed, then the making of a puncture, which is exactly like the one previously used, in the. Groove that has already been created must fit, extremely difficult and subtleties must be observed when making the penetration, as they hardly occur with other profiles. The new penetration used for further reworking of the profile should only ^{connect to the wall of the pre-machined hole at one} point not exactly to 1 Z ₁₀₀ mm, so the penetration or the created drawing form can no longer be used. The reasons for this cannot be explained in detail without becoming prolific, but they are sufficiently known to every person skilled in the art. When drawing itself, the peculiar profile of the wire creates great difficulties, as can be seen from the shape of the piece of wire. The use of divided drawing dies for the present profile is forbidden by itself, because with the extraordinary pressing and processing of the wire piece at the joints of the drawing dies, even with the most precise processing of the same, a fine degree would set, which when processed by the following drawing dies would destroy the material would lead. It was just noted that the wire cannot of course be produced in a single drawing process, rather it has to go through several drawing forms one after the other. When the prepared wire has set degrees, it will jam in the following shape and destroy the wire. Attempts have been made to produce the profile by rolling, namely by disc rolling. The manufacture of the rollers is of crucial importance here. Since the wire has to be cold-rolled, the roller,

Claims (2)

which consists of a disk, are hardened. It is known that the hardening of disk-shaped bodies presents extraordinary difficulties in that, during hardening, a more or less severe warping of the piece regularly takes place. This distortion occurs in particular with disc rollers for the present purpose because they are extremely narrow with a relatively large diameter. In addition, so-called hairline cracks easily develop during the hardening of these roller disks, which make the disks unusable. This explains why a finished disc is extremely expensive to manufacture because each has several unusable predecessors. It can also be explained that the sharp edges of the disc rollers wear out very quickly or even break out in small particles, making the discs unusable. This makes the production of the wires extremely expensive, so that it is not possible to successfully use disk rollers to produce the doll wires. This exhausts the known means for making the doll wires. These means could of course be used and are still used today, but due to the nature of the wire profile, they cause such high costs that the shoe oarlocks have so far not been able to be successfully introduced due to their high price. According to the present method, it is initially foregone to give the wire a profile which corresponds to the required profile; rather, the profile shown in FIG. To explain the further process, it is interposed here that the shoe oarlocks made of pieces of wire, which are cut to the appropriate length by a machine, are bent and finished on the same machine over a mandrel. Since this machine is already there, it can be easily used without. a significantly increased work performance would be required of the machine by means of a punch, which is moved up and down by the machine, to press the groove b into the wire according to FIG. 1, each time for the length which is for one oarlock becomes necessary. Since the previously used machine cuts and bends, it is equipped with an up and down working step. The aforementioned stamp, which is easy to manufacture and replace, only needs to be attached to this at a suitable point in order to give the piece of wire its final profile. Since the length of a single oarlock is also only short, a substantial force for pressing the groove is out of the question. For example, the procedure can follow in-. the way to be executed. In front of the machine, which takes care of cutting the wire to the prescribed length, a suitably shaped punch 0 Profile bar c represents. Instead of one groove b, several could also be incorporated. The main advantage that is achieved by the method according to the invention, as already mentioned, is that the force used to produce the groove, because the groove is only worked into a short piece of wire each time, is very low, which means that the Production of oarlocks significantly cheaper. As soon as the punch has pressed in the groove, the piece of wire automatically pushes itself further by mechanisms known for this purpose, is cut to length and closed. the oarlock d shown in Fig. 3 is bent. The oarlocks are driven in a known manner with the sharp edge in the shoe soles and heels during use, the leather engages over the groove b and this holds the oarlocks in place. Godfather nt-A ν sr rüciie: 1. A process for the production of so-called shoe oarlocks, characterized in that, instead of the oarlocks made of pre-drawn profile wires, of which the Should the necessary pieces be cut off, make them from wires, which is useful in cross-section the shape of a one-sided. sharpened rectangle '(Fig. 1) have, by pressing the groove ■ to a length, as for the production of a Oarlock is needed to be made. 2. Device for carrying out the method according to claim 1, characterized in that that in front of the machine, which causes the cutting of the wire ends in a known manner, a punch is arranged ■ is who the groove in the profile wire before further processing. 1 sheet of drawings.