ALEXANDRIA, Va., Feb. 3 -- United States Patent no. 12,540,658, issued on Feb. 3, was assigned to NSK LTD. (Tokyo).
"Ball screw device and method for manufacturing same" was invented by Ryo Segawa (Fujisawa, Japan) and Yuta Nakabayashi (Fujisawa, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A fitting shaft portion has an inner-diameter side engaging portion on an outer peripheral surface with external teeth arranged in a circumferential direction; a fitting member has an outer-diameter side engaging portion on an inner peripheral surface with internal teeth arranged in the circumferential direction and engaging with the inner-diameter side engaging portion; an engaging portion between the inner-diame...