ALEXANDRIA, Va., Jan. 29 -- United States Patent no. 12,209,613, issued on Jan. 28, was assigned to NSK LTD. (Tokyo).
"Crown-shaped retainer for ball bearing and ball bearing" was invented by Yasuhiro Iwanaga (Fujisawa, Japan) and Yoshimune Shimokawa (Fujisawa, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A bar portion is formed so that an outer circumferential surface on a tip portion side is located on an inner diameter side with respect to an outer circumferential surface of a main portion. On an inner diameter side of a cage, lightened portions obtained by notching in an axial direction from an axial side surface of the main portion are formed separately at positions of the respective bar portion...