ALEXANDRIA, Va., Aug. 6 -- United States Patent no. 12,377,304, issued on Aug. 5.
"Adjustable weight dumbbells" was invented by Xiaorong Tong (Jinhua, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "An adjustable weight dumbbell includes a dumbbell bar, a handle, a dial, a dumbbell rack assembly, weight adjustment assemblies, and weight plates. The dumbbell rack assembly includes inner and outer support frames and a connecting frame fixed with the support frames. The inner support frame is rotatably cooperated with the handle, the outer support frame and the dumbbell bar. The inner support frame includes a locking mechanism for locking a rotation of the inner support frame relative to the dial. The weig...