Patent ID: 6708704
Filing Date: 2004-03-23
Classification: A45B

Abstract:
A structure for automatic opening umbrella comprising a shaft having a plurality of tubes, an upper joint connected at a top of the shaft and a handle connected at a bottom end of the shaft; a displaceable runner provided about the shaft; a frame having ribs connected to the upper joint and the runner to form a foldable umbrella; the runner including first and second connectors and a tubular portion extending axially therebetween, the first and second connectors being unequal in radial extent, the ribs of the frame including a main rib having its inner end connected to the upper joint, a longitudinally extending supporting rib having its inner end connected to the first connector of the runner and having its outer end connected to an intermediate point of the main rib, and a longitudinally extending spring having its inner end connected to the second connector and having its outer end connected to the intermediate point of the main rib, the spring being tensioned as the umbrella is folded to provide a recovery force for automatically opening the umbrella, the spring and supporting rib being maintained to extend from the intermediate point of the main rib in laterally spaced manner along substantially their longitudinal lengths one relative to the other both in opened and closed positions of the umbrella.