| 摘要 |
<p>PROBLEM TO BE SOLVED: To extremely reduce a difference from ordinary use, without particularly largely increasing frictional resistance in fastening, without causing co-rotation of a bolt head part or a nut and a holding part body.SOLUTION: An elasticity imparting part 70 is installed so as to add elastic force for pressing an outer surface in the axial direction of a nut 50 inserted into a square hole 21 of a ratchet gear 2. In the square hole 21 and the nut 50 of the ratchet gear 2 installed in a holding part body 1 by the elasticity imparting part 70, the holding part body 1 and the nut 50 normally become an abutting state, and the holding part body 1 is integrated with the nut 50. The elasticity imparting part 70 for applying the elastic force in the axial direction of the nut 50 of the ratchet gear 2, imparts external force for pressing the nut 50 held by the square hole 21 of the ratchet gear 2. The nut 50, in the relation between its female screw and male screw, is in contact with a proceeding flank of the female screw when fastening the female screw, but the elastic force imparted by the elasticity imparting part 70 is to impart the elastic force to these frictional resistance, and enhances the frictional resistance with a mating material.</p> |
