Screwing device including a screw with a special head and a socket adapted to this head

摘要

The screwdriver chuck is designed to engage with screw heads that have stepped layers (4, 8), one with teeth and a smaller smooth one to receive the tips (22) of the chuck's jaws (17). The chuck consists of a socket (10) with a hexagonal shank (12) and two cavities (13, 14) for the screw head and jaws to receive the screw head. A third cavity (15) contains an axial core that presses against the end face of the screw head.