US Patent Issued to NSK on March 4 for "Multi-row ball screw" (Japanese Inventor)

ALEXANDRIA, Va., March 5 -- United States Patent no. 12,241,527, issued on March 4, was assigned to NSK LTD. (Tokyo).

"Multi-row ball screw" was invented by Takayuki Yabe (Kanagawa, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A multi-row ball screw includes a nut having a plurality of spiral grooves on an inner peripheral surface thereof, a screw shaft having a plurality of spiral grooves on an outer peripheral surface thereof, and a plurality of balls disposed so as to be rollable on rolling paths constituted by the plurality of spiral grooves of the nut and the plurality of spiral grooves of the screw shaft. The spiral groove of the nut includes a U-shaped first spiral groove having left and right...