DE39532C - Device and process for the production of the clamps patented under No. 36 196 - Google Patents

Description

IMPERIAL

PATENT OFFICE.

The invention aims at corner connections. Cardboard box serving To manufacture brackets in such a way that their cross-sectional shape corresponds exactly to the conditions which have emerged as indispensable for the usefulness of the brackets.

First of all, it is important to have the metal strips that are processed into staples should be achieved in exactly the same width throughout and along the longitudinal edges this sheet metal strip the acute-angled teeth on both sides in exactly the same length and the same To produce division.

The separation of these strips from the sheet metal and the creation of the teeth on the We have not only combined stripes into one operation, we also gain from it an operation of a sheet of metal at the same time two ready-toothed strips by means of one for machine designed for this purpose, the tools of which are shown in the accompanying drawing Fig. Ι in the front view, Fig. 2 in cross section and FIG. 3 is shown in the top view of the lower part and is as follows are:

Two knives A and B, the cutting edges of which are profiled according to the teeth to be produced on the sheet metal edges, rest on a common plate C and are attached to it in such a way that the distance between their two facing cutting edges is consistently equal to the width of the sheet metal strips to be produced . The surface of the knife A is designed as an inclined plane sloping outwards from the cutting edge, as can be seen in FIG. On the surface of both knives, at right angles to their longitudinal direction, there is the stop bar D on one side, and above the surface of the knife A, parallel to its longitudinal direction, a second stop bar E, the stop edge of which is a certain distance from the cutting edge of the knife A, as shown below Has.

On the associated counter knife F there are two cutting edges, the shape and distance of which is so dimensioned that they must come into contact with the cutting edges of knives A and B at all points when the counter knife moves down parallel to the latter. The counter knife F is attached to a traverse G, which carries horizontally lying pins at both ends. A tie rod engages each of these pins, the other end of which includes a crank pin. Both crank pins have the same position in relation to the crankshaft; therefore the traverse G must also be moved down with the counter knife jF in a constant horizontal position.

In order to obtain the toothed sheet metal strips necessary for the production of staples, a sheet metal sheet is placed so far over the knife B , with its side edge resting against the stop D , that its cutting edge in connection with the corresponding one of the counter knife F only cuts the front edge of the sheet metal sheet. The latter is then always advanced so far that the tips of the resulting row of teeth touch the stop E , as indicated by dotted lines in FIG. .

Claims (1)

Each time the knife F goes down, it makes two cuts at the same time in conjunction with knives A and B, thereby severing two completely similar strips from the sheet metal with acute-angled teeth on both longitudinal edges. One of these strips falls through between knives A and B, while the other slides on the inclined plane of knife A under the stop bar E. On the obtained strips a, FIG. 4, not only are the tips of the two rows of teeth bent at the same time by means of a stamping process, but the strip between the two bent edges is also given a convex shape according to FIG. 5 at the same time. By means of a second embossing process, the strip prepared in this way is bent in the direction of its longitudinal axis in such a way that two of the same result from the one convex surface, which together form an obtuse angle (see FIG. 6). In this form, the clips are ready for the production of corner bandages on boxes made of cardboard with the clip on the outside. For corner bandages with internal brackets, the strips prepared according to FIG. 5 are bent in the direction of their longitudinal axis by means of suitable stamping molds so that the two surfaces thus created form an acute angle with their concave sides (see FIG. 7). For these embossing processes we use both rod-shaped and roller-shaped embossing devices, the working surfaces of which for the preparatory stage according to FIG. 8 and FIG. 9 for the completion to onsen lying brackets according to FIG. 10 respectively. 11 and for the completion of internal brackets according to FIG. 12 respectively. 13 are profiled. These embossing devices can be used not only individually, but also those belonging to the production of one type of clamp combined in one machine to form a system, as is shown, for example, for roller-shaped embossing devices for the production of external clamps in FIG. 14 as a side view. Then the first pair of rollers H J feeds the strip prepared in the same according to FIG. 5 to the second pair of rollers KL, which completely converts the strip into the finished clamp. The straightening device, which is combined with the embossing devices and consists of the rollers M N and O, finally straighten the finished staple strips. Pateντ claims: For the production of the under No. 36196 patented brackets: ι. A device for the simultaneous severing of two metal strips from a metal sheet and forming the teeth on the longitudinal edges of the strips, consisting of the two knives A and B profiled at their cutting edges, the first of which forms an inclined plane on its surface, with the stop strips D and E and the counter knife F. 1. The conversion of these flat strips a (Fig. 4) by means of two embossing processes, first preparatory into the cross-sectional shape according to FIG. 5 and then finishing either into the cross-sectional shape according to FIG. 6 or into that according to FIG 8, 10 and 12 or roller-shaped according to FIGS. 9, 11 and 13 and can be used both individually and combined to form a system (FIG. 14). 1 sheet of drawings.