ALEXANDRIA, Va., July 30 -- United States Patent no. 12,370,609, issued on July 29, was assigned to SHIN-YAIN INDUSTRIAL Co. LTD. (Taichung, Taiwan).
"Tool holder assembly easy to assemble and disassemble" was invented by Pen Hung Chen (Taichung, Taiwan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A tool holder assembly easy to assemble and disassemble has a chuck and a clamping unit. The chuck has a base portion, a nut positioning portion, and an annular groove between the above two portions. An arc surface is formed on a periphery of the nut positioning portion by cutting. The clamping nut is hollow, surrounds an interior space, and has an inner protruding edge to form an eccentric circle in the interior...