Locking screw is made from electrically non-conductive material, especially plastically deformable material, and has external thread, along which several pointed projections form row

摘要

The locking screw is made from electrically non-conductive material, especially plastically deformable material. It has an external thread (40), along which several pointed projections (46) form a row. An independent claim is included for mains-operated hand tools fitted with the screws.