US Patent Issued to THK on Oct. 20 for "Ball screw" (Japanese Inventors)

ALEXANDRIA, Va., Oct. 21 -- United States Patent no. 12,768,433, issued on Oct. 20, was assigned to THK Co. LTD. (Tokyo).

"Ball screw" was invented by Yohei Amemiya (Tokyo) and Yuki Hayashi (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "Provided is a ball screw where a three-dimensionally formed recirculation trajectory of a recirculation groove can be connected to a helical trajectory in such a manner that the tangential directions thereof are substantially continuous. A ball screw (1) includes: a ball screw shaft (2) including a helical groove (2a); a ball nut (3) including a helical groove; and a plurality of balls (4) placed between the helical groove (2a) of the ball screw shaft (2) and the helic...