ALEXANDRIA, Va., May 19 -- United States Patent no. 12,631,241, issued on May 19, was assigned to Jiangsu Winroller Transmission Technology Co. LTD (Jiangsu, China).
"Electric drum" was invented by Pu Wang (Jiangsu, China) and Xinjun Xue (Jiangsu, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to an electric drum, which comprises a dual-gear reduction mechanism that comprises at least one stage of sun dual-gear, N planetary dual-gear sets and a gear ring; the at least one stage of sun dual-gear is coaxially arranged with an output gear shaft of a motor; the N planetary dual-gear sets surround the at least one stage of sun dual-gear, and the structure of each planetary dual...