| 摘要 |
<p>A screw (6) extending through the knuckles (1a, 1b, 3a) of the arm hinge of a pair of spectacles and having a threaded end (6a) screwed into one knuckle (1b). The part of the screw (6) that extends beyond said knuckle (1b) has an annular groove receiving a circlip (9) which engages the outer surface (7) of the knuckle (1b) to prevent inadvertent loosening of the screw (6) with its head (6b) held in engagement with knuckle (1a). The size of the annular groove receiving the circlip (9) is such that said groove is partially located within the knuckle (1b). As a result, should the assembly become loose, it can be tightened again by replacing said circlip (9) with another slightly thicker circlip.</p> |
