| 摘要 |
A miniature pushbutton switch capable of being made compact as well as being given a sufficient contacting pressure for reliable switch operation. The switch comprises a housing with first and second contacts, and an electrically conductive torsion coil spring composed of a coil portion and a pair of first and second arms integrally extending therefrom. The coil spring is assembled in the housing with the first arm constantly engaged electrically with the first contact and with the second contact in engageable relation with the second contact. A pushbutton is supported by the housing to be movable between an inoperative position and an operative position respectively of breaking and making the electrical connection between the second arm and the second contact. The first and second arms extend in opposite directions from the coil portion. The pushbutton is held in direct engagement with the coil portion to displace it when the pushbutton is pushed to the operative position, whereby the second arms is caused to resiliently deform to make or break the electrical connection with the second contact. As the coil portion is displaced by a force applied from the pushbutton, the second arm as well as the first arm are resiliently deformed to thereby develop sufficient contacting pressures even at the beginning of engaging the second arm with the second contact. Consequently, the switch can be easily designed to have sufficient contacting pressures for reliable switch operation, even with the use of the coil spring of reduced axial length.
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