Cold forming tool for recessing screw heads - uses sliding punch pin with tip shaped to produce required cross shape

摘要

A cold forming tool (60) for forming a recess in the head of a screw has a tip (68) shaped to make a cross shaped recess. This tool slides in a holder (30) and consists of shaft (62) and an enlarged diameter part (64). The holder itself slides in a body (16) containing a piston (40) and fitted with a bushing (32). The holder (30) slides in the bushing against the force of spring (46) and has an arresting pin (34) worki ng in conjunction with a flattened part (36) of the holder (30) to keep the holder from being pushed out from the bushing. The rear face (48) of the holder (3) comes to rest against the corresponding face of the impact block (42) when the tool is pressed home on the screw head.