ALEXANDRIA, Va., June 6 -- United States Patent no. 12,280,287, issued on April 22.
"Locking mechanism for weight plate and dumbbell using same" was invented by Huiguan Chen (Zhejiang, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A dumbbell comprises a dumbbell body and a weight plate set, wherein the weight plate set comprises a weight plate and a locking mechanism; the locking mechanism comprises an accommodating disk, a limiting device and a limiting disk; the limiting device comprises a limiting block and a transmission block; the limiting block has a locking position and a releasing position; a limiting rail groove is arranged on the limiting disk; the limiting rail groove has a locking section ...