Tool for tightening security nut, tool for releasing security nut, tool for both tightening and releasing security nut, and security nut for exclusive use of these tools

摘要

A tool for tightening a security nut, a tool for releasing the security nut, a tool for both tightening and releasing the security nut, and the security nut for exclusive use of these tools enabling the easy tightening of the security nut and the easy removal, with an exclusive tool, of the security nut which cannot be easily removed with a normal tool. The tool (1A) for tightening the security nut used for tightening the security nut (N) formed in a generally truncated cone shape by screwing onto a bolt comprises a hollow body part (2) storing the outer peripheral tapered surface (n) of the security nut (N), a holding part (3) for rotation projectedly formed at the upper part of the hollow body part (2), a head part female screw part (4) passed to an internal space (21) along the axis of the holding part (3) for rotation and screwed to the bolt (B), and an elastic friction member (5) fixed to an inner wall surface (22), having an inner peripheral tapered surface (52) formed at a generally equal inclination angle according to the outer peripheral tapered surface (n), and having an elasticity.