A windbreak and air-ventilating folding umbrella includes a frame coupling with a linkage bar. The linkage bar has one end attached to a sleeve which is movable on the frame and another suspended to allow the linkage bar having open or close movement at the suspended end. The sleeve is formed in C-shape....http://www.google.fr/patents/US6601597?utm_source=gb-gplus-shareBrevet US6601597 - Windbreak and air-ventilating folding umbrella
