| 摘要 |
PROBLEM TO BE SOLVED: To provide an improved structure of a wrench fitting part for preventing the fitting part from slipping to idly turn and preventing the damage of the fitting part when tightening and loosening a bolt and a nut. SOLUTION: A circular arc convex surface 24 of the wrench fitting part 22 is shaped to present a large circular arm form to prevent damage when fitting the circular arc convex surface 24 to the bolt and nut outer side face, and also to prevent the fitting part from slipping to idly turn when tightening and loosening. A basic angle of a storage clearance 23 is designed to present a small circular arc form to disperse stress generated when tightening and loosening the bolt and nut to thereby prevent the damage of the fitting part 22. COPYRIGHT: (C)2005,JPO&NCIPI
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