DE309839C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

Vr 309839 CLASS 68 a. GROUP

Patented in the German Empire on July 15, 1916.

The invention relates to a method for the simplified production of keys with a curvature, after which the beard is made of one piece in a manner known per se Strip steel punched key provided by milling with any curvature and the key tube intended for guiding the flat key by simply pulling it open a slotted tube on the flat

ο bridge is made, with the bridge connecting the beard and the rhombus lengthways borrowed part (shaft) is to be understood.

In themselves, flat, punched keys with a lobed beard are used for security locks known. The identified invention aims, however, the usual production of keys cast with pipe and flare by a far simpler and Cheaper process to replace, since the production of cast keys out of hand larger facilities for casting require a lot of time and effort for processing the blanks.

The effort here is a relief

To create something or simplification has to be done beforehand led to various known manufacturing processes, but compared to the present subject matter of the invention have considerable disadvantages. With the majority of these known key, the solution to this problem is attempted that the main Parts of the key can each be manufactured and processed separately.

For example, keys are known at which is a short, solid, round, grooved tenon in one of the rhombuses Sleeve is attached and forms the key shaft together with her, or there are keys known, which consist of two nested sleeves, one of which to connect 4 <> Bring the rhombus, the other is used to attach the beard, with the Vierteilüng of the key, the intention of the separation in the processing of the individual parts especially is sharply expressed, and finally * 5 keys are no longer new to which Beard and shaft consist of a single piece of sheet metal, which is bent together to form a sleeve will. With the latter type of key, the curvature is attached to the 5 < > Beard not possible as with the present subject matter of the invention, while the two aforementioned Embodiments in production through the diverse work of assembling and attaching the individual parts to one another are even more complicated and expensive than cast keys.

The key manufactured according to the present invention differs from this in that that with him, first of all, in a manner known per se, that of the beard, shaft and Rhombus existing key body made from a piece of strip steel and in a single operation is produced, because only such a flat key body is to be attached suitable for the curvature by pressing.

Claims (2)

To enable it in turn to be used in locks of the usual type and to be able to use it as a full replacement for cast keys with curvature and tube, this is done by sheathing the flat key shaft with a commercially available tube, which makes these new keys with greater resistance due to the Flat key shank stiffened tube in weight ίο makes it lighter than the previously common, cast key. The drawing illustrates a key produced according to the present invention in the different, successive processing stages, namely: Fig. Ι the flat, punched key in a side view, Fig. 2 the same as in Fig. 1, but curved, from above seen, Fig. 3 two example executed curvatures in profile with the finished key in the front view, Fig. 4 the curly and encased key seen from below. The production of a key of the type indicated is done in the following way: The still flat key (Fig. 1), punched from a piece of steel strip with beard a, web b and diamond c, receives the desired curvature of his beard under the press. Then a slotted tube f - steel tube is most advantageous - is pulled over the web b, the gap of which leaves the lower, narrow side of the web b and thus a corresponding opening for the passage of the beard α free and which with two clipped flaps g over the approach the key diamond overlaps (Fig 4). Around the rear, which was previously blunted on both narrow sides or prepared in some other way - that is, next to the key bit. At the end of the key (suppository d) the tube f is pressed in, for example by means of a head cutter, so that it is secured against further displacement in the direction of attachment. At the other end of the key - on the key diamond c - it is fixed by means of a dovetail-like undercut attachment e or the like that has remained on its back. Thus, the slotted tube f sits immovably on the actual key body a, b, c, and is secured against twisting about the longitudinal axis of the shaft by the fact that the latter reaches with its lower edge into the gap formed by the two longitudinal sides of the slotted tube. In the manner indicated, any - including pressed - embodiment of the key diamond and any desired curvature and dimensions of the beard can be produced without restriction of the shaft length. Keys, the curve of which bends at the same height on two different sides at the same time, are produced by simply bending back the key bit (Fig. 3 right). Instead of the slotted tube f, which leaves the lower narrow side of the flat key body free, a slotted tube can also be used, which is bent over the key body and its gap after being bent down to the specially made outlet openings for the beard and the rhombus is completely closed. > Pat τ claims: 1. A method for the simplified production of keys with a curve, characterized in that the flat key body stamped in one piece from steel strip with a beard [a), web (b) and diamond (c) is provided with a curve by pressing and in connection with this by attaching a slotted tube (f), which is, for example, on the one open side by pressing over the uvula end (d) of the key body, on the other by means of a dovetail-like undercut ¹ approach (e) of the latter o The like. is fixed and particularly strongly stiffened by the flat shank of the key passing through in the direction of its longitudinal axis, and the rounding required for guidance is obtained. 2. Embodiment of the key according to claim r, characterized in that an only partially slotted and possibly with an exit opening for the key bit provided pipe is used. 1 sheet of drawings.