Expansion bolt for fitting in wall has drive member movable axially by turning in threaded boring

摘要

The bolt has a shell (1) bounding a central boring with rear threaded sector and front conical sector (13). It has slots in the front end, forming deformable claws (12). A ball (2) is inside the conical boring. There is a drive member (3) in the boring, with an outer thread to engage with that of the shell. The drive member can thus be turned to move it axially in the threaded boring in order to drive the ball axially towards the front end to deform the claws outward.