ALEXANDRIA, Va., Dec. 2 -- United States Patent no. 12,486,692, issued on Dec. 2, was assigned to Taiwan Fu Hsing Industrial Co. Ltd. (Kaohsiung, Taiwan).
"Rotary locked structure of door lock" was invented by Yu-Cheng Lin (Kaohsiung, Taiwan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A rotary locked structure of a door lock includes a tubular driving part and connected to a first knob. The driving part includes a restriction portion. An inner tube is received in the driving part and has a positioning portion located corresponding to the restriction portion to restrict rotational movement of the inner tube in the driving part. A restriction unit is formed axially in the inner periphery of the inner tube. ...