ALEXANDRIA, Va., Jan. 13 -- United States Patent no. 12,521,834, issued on Jan. 13, was assigned to Duro Industries LLC (Dover, Del.).
"Adjustable speed belt-disc sander" was invented by Haiquan Wang (Qingdao, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A speed-adjustable belt-disc sander is provided. The speed-adjustable belt-disc sander includes an electric motor, a first pitch adjustable pulley driven by the electric motor, a second pitch adjustable pulley driven by the first pitch adjustable pulley, a v-belt connecting the first pitch adjustable pulley and the second pitch adjustable pulley, a first pulley driven by the second pitch adjustable pulley, a second pulley driven by the first pulley, ...