DE7313918U - Wrench - Google Patents

Description

P 1458

Gebr. Böhler & Co, Aktiengesellschaft, Vienna Wrench

The invention relates to a wrench with torque limitation, in particular for hexagon socket screws, which has a lever arm consisting of two parts that can be bent with one another and a metered pre-tensioned helical spring to limit the tightening force. For the operation of space-saving hexagon socket screws standardized and non-standardized design standardized wrenches are increasingly used, which consist of a Right-angled pieces of hexagonal steel are made. Generally speaking, the wrenches are standardized in terms of Their dimensions and the quality of the chairs are dimensioned in such a way that di9 standardized, matching screws are not overloaded when tightening can be

However, there are a number of use cases in which with such wrenches screws are actuated, which in turn, e.g. via angle levers or eccentric arrangements, the Aohsialkraft the screw resulting from the rotation transfer other elements, which under certain circumstances may not be loaded with the full operating force that comes with the standardized screwdriver. It is therefore the

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would give a torque limit for such hexagon socket screws before. There are a number of commercially available torque wrenches on the market for this purpose. However, these are expensive Space-consuming and sensitive and prone to failure when operated repeatedly.

The invention is based on the stated disadvantages avoid and create a particularly simple and cheap wrench with torque limiting, which can easily be adapted to the respective conditions and does not require more space than the standardized, none Embodiment resulting in torque limitation. According to the invention, this is the initially given in the case of a wrench mentioned type achieved in that the helical spring is pushed onto the two parts of the lever arm.

Further details of the key according to the invention can be found in the following description of an exemplary embodiment out, which is reproduced by the drawing in a schematic representation. Fig. 1 shows a hexagonal key for actuating hexagon socket screws in view, FIG. 2 in plan view, partly in section.

The two-part lever arm of the key made of hexagonal steel consists of a right-angled insert part 1 and a straight handle part 1a. These two parts 1 and 1a are pretensioned by means of a preload attached to them having coil spring 3 connected to one another in a non-positive manner. The coil spring 3 is with a cover 4 from a elastic material, preferably made of plastic. The same represents a finger protection and results in an increase

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the break-off force of the lever arm. As soon as the torque when tightening a hexagon socket screw (into which the insert part 1 with its end inserted) a certain value in the area of the joint 2 present between the two parts 1 and 1a has reached, the helical spring 3 is bent by a relatively small angle 5 there. It has been proven that from This "softening point" the operator immediately that with his The torque applied by the fingers is reduced, whereby the overload protection is guaranteed.

The wrench according to the invention can, for example, also be used to tighten nuts or screws with an external hexagon, if on the one facing away from its handle End a hexagon socket suitable for them is provided.

Claims (2)

P 1458 e φχι s ρ r U c h e 1. Torque limiting wrench, in particular for hexagon socket screws, the lever arm consisting of two parts that can be bent to one another, as well as has a dosed pre-tensioned helical spring to limit the tightening force, characterized in that that the coil spring (3) is pushed onto the two parts (1, 1a) of the lever arm. 2. Wrench according to claim 1, characterized in that the helical spring (3) is provided with a coating (4) made of elastic material, preferably made of plastic. Gebr.Böhler & Co Aktiengesellschaft Patent office