Improved installation tool for tangless helically coiled insert

摘要

The insertion tool (10) for a helically coiled wire insert (16) of the type used for tapped holes in parent material that is generally softer than a fastener being screwed into the tapped hole has a pivotal pawl (70) engaging a cut out portion formed in the insert (16) in order that the insert (16) may be screwed onto the tapped hole. The driving face of the pivotal pawl (70) has a cavity (76) formed therein to capture the lead coil of the insert (16) and prevent its axial movement during installation.