| 摘要 |
<p>The hinge has an elongated box-like body (11) with an open receptacle inside which a cylindrical helical spring and a hinge articulation unit (16) are inserted. The articulation unit (16) slides and is pivoted to another hinge articulation unit (17) for fixing to eyeglasses. Length of the spring, when inactive, is equal to a distance between bottom of axial holes end part and end of a longitudinal milling.</p> |
