| 摘要 |
PROBLEM TO BE SOLVED: To provide a simple structured locking nut with high productivity, excellent in tightening efficiency and repeated use, capable of preventing screwing force from being lowered, when external force is applied to a member to be tightened and a bolt or the like capable of semi-permanently maintaining high tightening force and remarkably increasing safety of a tightened part of the member to be tightened. SOLUTION: The locking nut is the nut to fasten the fastened member by screwing with a male screw such as a bolt, and it is equipped with a nut body, an extended part coaxially extended to the upper surface of the nut body, a main female screw part formed on the inner peripheral wall of the nut body, an annular groove part formed on the inner peripheral wall of the nut body side of the extended part, and a sub female screw part, formed on the inner peripheral wall of the extended part, whose phase with respect to the male screw being displaced by 12°through 100°, preferably 24°through 90°, or further preferably 24°through 72°. COPYRIGHT: (C)2004,JPO
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