Driving mechanism for anchor.

摘要

Apparatus in accordance with this invention comprises a first part adapted to be positioned in engagement with an expander of an anchor bolt, a second part adapted to be engaged by a hammer drill, and a coupling between the first and second parts. The coupling includes a guide adapted to engage a bolt of the expander and a release normally connecting the second and first parts. The guide engages the release and holds the release in engagement with the first and second parts during driving operation but disengages the release after the expander has moved a preset distance relative to the bolt.