| 摘要 |
PROBLEM TO BE SOLVED: To provide a fastening structure which improves anti-loosening effects even in the case where a fastened member is iteratively rotated to any arbitrary stop position.SOLUTION: The fastening structure includes: a rim lock side top 3a to which a temple side top 2a is fitted; and a fastening screw 4 including a hinge part 6 and a screw part 7. The hinge part 6 includes a resin sleeve 6b that covers a screw thread 7a of the screw part 7 for two or more pitches, and the resin sleeve 6b covering the screw thread for one or more pitches of the screw thread is positioned within a female screw part 3ab that is provided in the rim lock side top 3a. Thus, a body of the resin sleeve 6b of the hinge part 6 can be expanded and at the same time, the resin sleeve 6b can be embedded in a gap between the screw part 7 and the female screw part 3ab of the rim lock side top 3a. Even if the temple side top 2a is iteratively rotated to any arbitrary stop position, the temple side top can be held at the arbitrary stop position, further, the fastening screw 4 is prevented from being loosened, and the fastening structure with the high anti-loosening effects can be provided. |
