Patent ID: 8207463

Claim:
A miniature switch comprising: a switch operating unit including a holder and an operational button fixed to the holder, the operational button having bottom protrusions respectively located on left and right sides of the operational button; a switch mechanism unit including a printed circuit board, a connector, and switch elements arranged in a case, and coil springs which engage between the switch elements and the holder; and three switch elements arranged on the printed circuit board, including two switch elements respectively arranged on left and right sides and operated by the swinging motion of the operational button, and a central switch element operated by pressing of a central portion of the operational button; and wherein the switch operating unit and the switch mechanism unit are coupled to each other by a packing made of a resilient material, and the switch mechanism unit and the switch operating unit are disposed in a housing; and wherein, by lowering the operated side of the operational button owing to the swinging motion of the operational button, a bottom protrusion of the operational button moves away from an inner step of the housing and descends along an inner surface of the housing, while the bottom protrusion of the operational button on the non-operated side of the operational button is supported by an inner step of the housing on the non-operated side of the operational button so as to serve as a fulcrum of the swinging motion of the operational button, and wherein, by operating the central portion of the operational button, the bottom protrusions on the left and right sides of the operational button move away from the inner steps of the housing and descend along the inner surface of the housing, such that only the central switch element is pressed down to operate.