Allen key, comprising lower end to be adjusted in width by insertion of screw with conical head

摘要

The key (10), designed as a hexagonal shaft with a cranked lower end (11) to be used for tightening and loosening screws with a hexagonal recess at the top can be adjusted in order to act effectively on a worn out screw. It is provided with three longitudinally positioned short slots (12) at its head (11) and a central bore (13) with a conical front (131) and a threaded main area. The segments formed by the cuts (12) are spread apart when a screw (20) with a threaded shaft and a conical (21) head is inserted into the bore (13). The tool head (11) is provided with a textured outer surface (14) for a firmer contact.