Tool core for screwdriver

摘要

The core (1) has a counterbore (2) which receives a carrier (4) with a polygonal cross-section. The carrier is joined to the core via a flange (14). A holding cap (10) fits over the carrier and meshes with an inclined surface (15) on the carrier via a sprung section (18). The cap has an axial opening (17) smaller than the flange. The sprung section is preferably a tongue in a groove (19) in the cap, which it may be integrally formed with.