ALEXANDRIA, Va., Feb. 11 -- United States Patent no. 12,545,561, issued on Feb. 10.
"Hand-held jack" was invented by Chung Li Chen (Taichung, Taiwan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A hand-held jack has a main body, including a frame on a grip, the frame having a shaft hole passing through a first chamber and a second chamber therein, a jacking member being fixed to a front end of the frame; and a slow-down device. The slow-down device includes a swing seat pushed by the first spring and mounted in the second chamber; at least one shaft clamp and at least one restricting plate urged by a third spring that are disposed in a first accommodating groove and a second accommodating groove of the swin...