Fixing system, assembled of two elements to be joined and specifically shaped screw

摘要

The screw (1) has a cylindrical shaft (2) surrounded by a helical thread (4) and an upper area of a conical shape (3). The top is flat and a self-tapping threaded surface (5) surrounds the adjacent conical area (3). The upper layer of the two objects to be joined is provided with an opening with a conical inner surface for the accommodation of the upper area (3) of the screw (1). When the screw (1) is inserted a thread is cut into the conical inner surface, resulting in a particular stable connection.