ALEXANDRIA, Va., July 16 -- United States Patent no. 12,357,866, issued on July 15, was assigned to Wuyi Boda industry and trade Co. LTD. (Jinhua, China).
"Weight-adjustable dumbbell" was invented by Zige Wu (Jinhua, China) and Mingkai Wu (Jinhua, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A weight-adjustable dumbbell includes a plurality of dumbbell plates; abase for holding the dumbbell plates; a positioning shaft; a handle movably sleeved on the positioning shaft; a plurality of cam structures disposed on two ends of the handle respectively; and a driving plate disposed between the handle and the cam structures, where the handle drives the plurality of cam structures to rotate on the positioning...