ALEXANDRIA, Va., Dec. 31 -- United States Patent no. 12,510,139, issued on Dec. 30, was assigned to LIN GWO TSAIR ENTERPRISE Co. LTD. (Tainan, Taiwan).
"Manual screw shaft driving device" was invented by Yu-Hao Lin (Tainan, Taiwan).
According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed is a manual screw shaft driving device, comprising: a screw shaft, a driving member, a front one-way bearing, a rear one-way bearing, a front teeth member, a rear teeth member, a gripping member and a driving direction switching member, wherein while the driving direction switching member is switched to a first switching position, the driving member is not rotatable in a second rotation direction and is rotatable in the first...