A 340-word composition on the invention of automatic umbrella

Automatic umbrella patent application date:1990.1.19 (patent right) An automatic umbrella of Dembach Management Investment Co., Ltd. has at least two folding ribs and at least two telescopic rods, on which there is a movable main sliding sleeve hinged with the lower ribs of the umbrella, and there is also a lifting slide. In order to reduce the force required to pull down the main sliding sleeve and the sliding friction of the spring on the rod, the bottom end F' of the driving spring F is supported on the solid support W of the rod 1, and the spring is pressed and loosened by the top cover 20. At this time, the top cover can be freely hung on the rod end 1b, or guided to move in the rod end due to the tension of the spring and the upper supporting bone 30.