Title: Switch apparatus

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Abstract: A switch apparatus comprises at least one contact block which is adapted to be connected with other contact blocks similar thereto in multiple stages quickly and easily. Each contact block includes a casing, a connector for causing the contact block to mechanically engage the casing of another contact block similar in shape or a lamp transformer block, at least one electrical contact contained in the casing, and a contact actuator member for actuating the contact. The contact actuator member is supported movably between a first position where the contact is unactuated and a second position where it is actuated. The contact actuator member is normally urged to the first position by bias means such as springs. In assemblying the contact blocks, the contact actuator member may be selected from a group consisting of plural contact actuator members in various forms so as to actuate the contact blocks in upper and lower stages in either the same or different operation mode. The casing of each contact block may be electrically separately embedded with a pair of conductors or provided with a hollow pillar portion at the center thereof, so that the conductors may connect an indication lamp disposed on the top of the contact block to the output terminals of the lowest-stage transformer block or so that a lead-out member of the lowest-stage transformer block leading to an indication lamp may be inserted through the hollow portion of the casing to provide a simple indication lamp.


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