HINGE FOR AUTOMATIC CLOSURE OF SPECTACLE ARMS

摘要

This invention is a new type of articulated joint that is fitted between the tip of the arms and the front of the spectacles, by means of which hinge the arm closes automatically when it has been removed from the head or from any other agent that causes the arm to be open in relation to the front of the spectacles. The original feature of this invention is the fact that it consists of a reel or drum onto which an elastic device is wound (20) that is attached to one end of the hinge (M) and which houses and holds in position the end (21) of the spring (20). The other end (22) of the spring is fixed to the wall (14) of the box (10) that contains it and centres it. This box (10) is fitted to the other end of the hinge (A) that is to be assembled and is internally provided with viscous or antifriction material (30) that gradually makes the elastic device expand as a reaction to closure.