| 摘要 |
PROBLEM TO BE SOLVED: To repeatedly use a mechanism to prevent threadedly fastened condition of a bolt and a nut from loosening, by relatively structuring the bolt and the nut, without using any other part, and by using elastic deformation rather than plastic deformation. SOLUTION: If a lock nut male screw part 2a of a lock nut 2 is screwed in a bolt screw part 1b of a bolt body 1 penetrating through a through-hole 3a of a body 3 to be fastened, an expanded inner wall part 2c of the lock nut at a taper tip opening part 2b pressingly abuts on an expanded outer wall part 1e of the bolt at a taper tip part 1c. In addition, if the lock nut 2 is threadedly advanced by increasing torque, the expanded inner wall part 2c of the lock nut goes over the expanded outer wall part 1e of the bolt based on elastic deformation and advances to a taper run off 1d, in order to form a fastened condition. Thereby, as long as inversely rotating external force having a considerably big torque is added, no loosening will be produced in the fastening condition of the lock nut 2.
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