US Patent 11197385 Expansion card holder and hook fixing mechanism

A hook fixing mechanism includes a fixing frame, a first hook, and a second hook. The first hook is rotationally mounted on the fixing frame. A first end of the first hook protrudes from the fixing frame, and a second end of the first hook is movably snapped on the fixing frame. The second hook is rotationally mounted on the fixing frame. A third end of the second hook protrudes from the fixing frame, and a fourth end of the second hook resists against the first hook.