| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a bolt loosening stop structure which does not cause complication in manufacturing, and can secure loosening stop performance.SOLUTION: A cap 20 having a cylindrical inner-shape is pressure-inserted into a hole 31 of a member 30 to be fastened, a head 10A having a cylindrical external-shape of a bolt 10 is rotatably loosely fit to the cap 20, fit-in recesses 10C, 20C are formed at an outside face of the bolt head or at an inside face of the hole of member to be fastened, bottom faces 10C-1, 20C-1 of the fit-in recesses are formed so as to be gradually shallow toward a progressing side of a bolt fastening direction, rolling stoppers 11 are accommodated in the fit-in recesses, and springs 12 for energizing the stoppers to a progressing side of the bolt fastening direction are arranged in the fit-in recesses. The stoppers permit the rotation of the bolt head part to the fastening direction, and prohibit the rotation of the bolt head part to the loosening direction.</p> |
