Torque wrench for single-screw tightening having a marker device

摘要

The invention relates to a torque wrench for single-screw tightening, in which after the tightening torque has been reached a marker is automatically issued which documents the correct tightening operation. On repeated assembly of a screw connection, for example for repair reasons, the last documentation in each case is to be clearly recognisable. Moreover, the tightening of all of the screws of a set of screws is to be detectable through the documentation. For this purpose, provision is made, on the torque wrench, of a counting comparator which allows a marker to be issued only when the preset number of tightening operations is reached. The marker device is designed as a remotely operating unrolling device, for a self-adhesive strip or the like, which delivers a defined section thereof as a marker. The counting comparator and the marker device are operatively connected in such a way that the setting of the counting comparator to zero and the delivery of the marker can be triggered only jointly and discretely.