ALEXANDRIA, Va., July 9 -- United States Patent no. 12,350,540, issued on July 8, was assigned to Wuyi Boda industry and trade Co. LTD. (Jinhua, China).
"Automatic plate-changing integrated dumbbell" was invented by Youben Chen (Hangzhou, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "An automatic plate-changing integrated dumbbell includes a dumbbell and a base to limit and place the dumbbell; where the dumbbell includes: a grip rod; two retractable rods are telescopically mounted inside the grip rod to support the plurality of weight plates at the ends of the dumbbell; a spiral driving groove is formed inside the grip rod to drive the retractable rod to expand retract; an outer periphery of the retra...