ALEXANDRIA, Va., Aug. 12 -- United States Patent no. 12,385,529, issued on Aug. 12.
"Complex clutch apparatus" was invented by Eun Sook Chang (Goyangsi, South Korea).
According to the abstract* released by the U.S. Patent & Trademark Office: "Proposed is a complex clutch apparatus which includes a rotating block provided with a central shaft extending upward and an upward inclined protrusion part which surrounds a lower portion of the central shaft and is spaced apart by a predetermined distance from the central shaft, a C-shaped plate spring which surrounds an outer circumferential surface of the upward inclined protrusion part and is in elastically close contact with the outer side surface of the upward inclined protrusion part, a clutc...