In an embodiment of the design, the central pole1contains a fastener that will fix the position of the umbrella and deter any rotation or sliding of the umbrella up or down the central pole1. The fastener may be in the form of a clamp ...
Operating the winding mechanism opens and closes the umbrella canopy, and moving the sliding member up or down the main pole adjusts the angle of the canopy with respect to the main pole. U.S. Pat. No. 8,360,080, issued Jan. 29, 2013, to Kai Liu and Zhonglin Wang, relates to an...