A switch device includes a base, a pair of fixed contacts and terminal post disposed in the base, two movable contacts corresponding to the the both ends disposed on the fixed contacts, between the two ends another end is also provided, the base includes a upper lid which has buttons and return-spring thereon, the base comprises a push rod which contacts with the button on the upper end through the upper lid and has springs and slide bar in two holes on the lower end. The both ends of the slide bar contact with the two movable contacts. On the other end the push rod is provided with a damper and a gear engaged with the gear-rack, a linkage in the hole underside conrresponding to the movable contact on the other end, and a spring disposed between the movable contact and the ends. The advantages are: simple structure, convenient manufacture, reliable performance, good sealing, and long service life.




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