The claw is fixed to a pivot axle (3). The pivot axle is inserted through the bottom window frame. A threaded bar (4) is screwed from inside onto the pivot axle and fixed to the window frame (1). The key (5) with welded-on pressure plate is mounted on the pivot axle. The key is movable and the pivot axle with tightening claw (2) can be operated with the key which is flapped over the pressure screw (6) against the threaded bar.
