US Patent 9199105 Safety hook

A safety hook includes a hook member, a latch member, and a switch, wherein the both the latch member and the switch are pivoted on the hook member, and the latch member is moved between a lock position and an unlock position by pressing the switch. The hook member is covered by a insulating member, and the insulating member includes two insulating layers with different colors to warn the user by the color change if the outer insulating layer is worn. The latch member and the switch are covered by insulating members as well to avoid electric shock.