| 摘要 |
An improved hinge construction for spectacles, wherein two components are secured to the frontpiece and respectively the side arms of the spectacles' frame, the said components comprising cam means and spring-biased cam follower means for providing an elastic resistance to widening apart of the side arms, outside of a given service position, and planar faces complementary arranged for abutting on each other when a given excess-wide position is attained, providing a positive stop to further widening apart. |
