In plant null shaft in order the shaft and that possesses the containment element which is jointed, to joint with

摘要

A screw is inserted with its ball-shaped head (2) into the insertion element (3), touching the spherical inner surface (4, 6) and the matching surface (5) of a pressure element (10) added from above. A round bar (100) is positioned transversally in a u-shaped space in the upper area of the pressure element (10). When the inner screw (20) is joined to the threaded upper area (9) of the insertion element (3) the upper surfaces of the arms of the U (12) act as abutments, preventing a tilting of the screw (20) on the ball-shaped head (2).