| 摘要 |
A compact, double-throw double-pole push-button electric switch is comprised of: a base; four electric terminals fixed to the base; a lower spring retainer pivoted on the base; a push-button key slidingly disposed and captively retain within a housing connected to the base; an upper retainer pivotally disposed within the push-button key and carrying a shorting bar between the opposing pairs of terminals; a coil compression spring captively retained at one end by the lower spring retainer and captively retained at its opposing end by the upper spring retainer; and a pair of double lobe cams connected to the lower spring. As the push-button is depressed, the camming surface within the push-button key comes into sliding contact with one of the two lobes of each of the cams. The cams rotate on the base and bring a fixed lever arm extending from the cam into contact with the shorting bar. The shorting bar is lifted from a contact with the electric terminals and rotated with the upper spring retainer across the gap between the terminals. Simultaneously, the coil spring becomes compressed and straighten. At that point where the cam has rotated sufficiently far so that the coil spring is flexed in the opposing direction, the coil spring will expand thereby snapping the shorting bar across the terminal gap.
|
