An improved folding umbrella simila-res linkage.

摘要

An improved folding and similar umbrella linkage, characterized by being formed by a set of three rods fully cylindrical section, the first one subject at one end to the ring is slid along the shank of the umbrella and at the other end to the joint that joins the other two rods, which are slidable on one another to stretch or folded positions minimum and maximum length of both rods, corresponding respectively to the positions of the deployed and folded umbrella.