| 摘要 |
<p>A hinge for spectacles consists of two parts one of which one has a cam surface while the other part comprises a blind cylindrical housing in which are arranged at least one spring and one ball bearing, with the spring pushing the ball bearing against the cam surface. To avoid excessive wear of the cam surface and to facilitate the dismantling of the hinge, the hinge includes an intermediate part located in the housing between the ball bearing and the spring. The intermediate part provides less friction with the ball bearing than the friction between that ball bearing and the cam surface. The housing is provided with devices for retaining its contents which devices reduce the open cross section of the opening of the housing.</p> |
