| 摘要 |
PROBLEM TO BE SOLVED: To improve work efficiency by a method wherein the pitch angle of a bent screw part is changed so that a cut groove is closed by a forced bent part. SOLUTION: By screwing a bolt on a market through the thread part 6 of a nut 3 and fastening the bolt, the more fastening is increased after an object adhesion surface 5 is collided with an object to be fastened, the more the object adhesion surface is pressurized. In this case, a forced bent part 1 is bent toward the groove side, a cut groove 2 is narrowed or eliminated and deformation occurs to the pitch of a screw part 6, and a lock nut is prevented from unfastening by a work similar to a method to fasten a single ordinary nut. Further, by inserting a spring washer on a market in the tip of the nut 3, a fastening effect is further improved. Further, in a case the nut 3 is unfastened by all means, by changing the thickness of the forced bent part 1 and the depth of a groove bottom 4, the degree of unfastening is changed. Further, light unfastening is practicable by opening the cut groove 2 by a tool as rotation is effected in the unfastening direction of the nut 3.
|
