US Patent Issued to Trader Harbor on July 29 for "Caulking gun with multi-gear and adjustable thrust ratio" (Chinese Inventor)

ALEXANDRIA, Va., July 30 -- United States Patent no. 12,370,572, issued on July 29, was assigned to Trader Harbor Co. Ltd. (Shanghai).

"Caulking gun with multi-gear and adjustable thrust ratio" was invented by Yaozhong Zhang (Shanghai).

According to the abstract* released by the U.S. Patent & Trademark Office: "A caulking gun with multi-gear and adjustable thrust ratio is provided. In the caulking gun, the rotating trigger is pivotally connected to the fixed handle through a gear adjustment mechanism, which consists of a segmented circular limiting hole, a sliding groove and a segmented cylinder fixed pin. The sliding groove consists of groove openings respectively on the two sides of the connection part of the rotating trigger, and the s...