| 摘要 |
PROBLEM TO BE SOLVED: To provide a fastening force detecting method for a bolt-nut fastener with low detecting error and simple structure. SOLUTION: This bolt-nut fastener 1 clamps a fastener to be fastened by inserting a bolt 2 into an insertion hole h of the fastener being fastened and screwing a nut 5 to a male screw part 3 of the bolt 2 passing through the insertion hole h, and the male screw part 3 of the bolt 2 projecting from the top is extended to the top surface of the nut 5, a changing point of a spring constant Cb of the bolt is detected, and tensile force at the changing point is defined as fastening force F. COPYRIGHT: (C)2003,JPO
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