Automatic closing and opening umbrella with fixed type of plural sections of middle rod in variable dynamic process and ratio

摘要

This invention is an umbrella in automatic opening and closing manner with its rod in the middle, which has multiple sections, and it is in variable dynamic process including the umbrella's skeleton mechanism, spring, locating device, shuttle arrow, control mechanism, handle, change- over device and pulling rig. Its main novelty is that within the middle rod of the umbrella's skeleton, a contrivance to change is installed. At the ends of the pulling rope in the contrivance to make changes, they respectively reach the lower nest and shuttle arrow. The control mechanism is manipulated by the pressing of of the button to release the umbrella's skeleton in particular position for closing and folding and the reserve energy of the spring. In coordination with both pulling ropes, each section of skeleton is tracted to extend and make the upward movement of the lower next to open the umbrella. The locating device fastens the middle rod at the fixed position to resist against wind. It can release the traction force between sections of the skeleton under the firm control of of shuttle arrow. The spring between branch skeletons in the umbrella is to close the umbrella and to change the place to return to the original point.