DE383154C - Device for electrical heating of rivets or the like. - Google Patents

Description

Device for electrical heating of rivets or the like. Addition to Patent 364453. Patent 364453 deals with a device for heating rivets, in which the workpiece in electrically conductive clamping jaws with conical clamping surfaces is clamped at right angles to the workpiece axis. This device relates on rivets with dimensions within the usual limits, the length of the conical Clamping surfaces is limited. In contrast, there is the essence of the present invention in it, the workpiece is first in the axial direction by actuating the one movably arranged clamping jaw under relatively light pressure is taken, this pressure resistance is the reason for switching on the Working current and then after closing the working circuit the actual The workpiece is clamped by means of the transformer armature.

The Fig. I of the drawing illustrates a schematically shown Exemplary embodiment of the subject matter of the invention in side view, Fig. 2 the same in front view.

The designation in detail is as follows: transformer in housing form i, fixed current-conducting clamping jaw: 2 as the pole of the secondary winding, second clamping jaw 3 movably arranged in the axial direction to the workpiece, switching contact pair -., Switching contact bridge 5 slidable on linkage 6, compression spring 7 to keep the contacts apart .4 and 5, hand lever 8 for moving the clamping jaws 3 and for actuating the switching device, 4, 5, 6, 7, lever 9 for exerting the clamping pressure at right angles to the workpiece axis, bearing blocks io for lever 9, linkage ii and spring 12 for transmitting the Driving force in lever g. Lever 13 of the transformer part designed as an actuating magnet, workpiece 14.

Linkage 6 is at the end of lever 8 with a slot for guidance in the pivot pin of the lever 8 and to give way when the spring 7 is tensioned, which corresponds to the switching contact path. The same slot is also in the linkage i i provided for the purpose of applying any pressure to the spring on the lever 9 let it take effect. The arrangement of the lever 9 is such that in the rest position between these and the clamping jaws 2, 3 there is neither space nor pressure is.

The mode of operation is as follows: The clamping jaws are through the hand lever 8 2, 3 so far apart that the workpiece is convenient in any length can be introduced. When bringing the clamping jaws 2, 3 together by means of levers 8, the movement of the jaws 3 is limited because they are conical The clamping surfaces lie against the lever 9, which is under spring pressure. Are located the contacts .t, 5 in the on position, then the spring 7 acts with a very specific Pressure on the workpiece, and the actual clamping pressure on the part of the lever 13 has meanwhile started automatically. What is very important here is the way Tier lever 9 is almost zero and the path of the lever 13 is very minimal and always the same is great. Furthermore, a considerable advantage is to be sought in that workpieces in Shape of rivets or the like. of significant difference in length and diameter application can find. In order to achieve very short conical clamping surfaces of the clamping jaws 2, 3, two or more clamping surfaces arranged next to one another can be provided in the latter be.

The physical strength required to operate the device described Strictly speaking, therefore only extends to that for switching on the working current necessary performance, which is of course in relation to that especially with large workpieces not insignificant, otherwise usually caused by foot or hand lever clamping work is very minimal.

Claims (2)

PATENT CLAIMS: i. Device for electrical heating of rivets o. The like. According to patent 364453, which means that the workpiece is clamped transversely to the axis is, characterized in that the workpiece through first in the axial direction Actuation of one movable Kleminbaeke under relatively light pressure taken, this pressure resistance causes the working circuit to close and the actual clamping of the workpiece transversely to the longitudinal axis by means of the transformer magnet armature takes place automatically. 2. Apparatus and claim i, characterized in that the clamping jaws consist of brackets cast in one piece, which at achsialetn Able to yield pressure on the workpiece transversely to the workpiece axis.