US Patent Issued to NSK on Dec. 2 for "Ball screw device" (Japanese Inventors)

ALEXANDRIA, Va., Dec. 2 -- United States Patent no. 12,486,889, issued on Dec. 2, was assigned to NSK LTD. (Tokyo).

"Ball screw device" was invented by Yusuke Watarai (Kanagawa, Japan), Kyohei Ikeda (Kanagawa, Japan), Yuto Suzuki (Kanagawa, Japan) and Takayuki Yabe (Kanagawa, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A ball screw device includes: a nut having a first track path; an outer circumferential screw shaft having a second track path and a third track path; a plurality of first balls disposed between the first track path and the second track path; an inner circumferential screw shaft having a fourth track path; a plurality of second balls disposed between the third track path and the fourt...