| 摘要 |
A rocker type electric switch includes a first centrally mounted electrical terminal positioned so that an elongate bridging contact may pivot thereabout to and fro to engage and disengage a second fixed terminal to selectively make electrical contact therewith. The second fixed terminal has separate make, hold and break surfaces. The bridging contact is adapted to snap into initial electrical contact with the make surface of the second fixed terminal, thereafter slide up into abutting relationship with the hold surface of the second fixed terminal, wiping the initial make and hold surfaces clean of any electric arc contamination thereon. In the break cycle, the bridging contact initially slides away from the butt connection of the second fixed terminal, while retaining electrical contact with the terminal. The contact surface of the bridging contact slides away from the hold surface of the second fixed terminal and along a separate break surface thereof until the force moment caused by the plunger member reduces sufficiently to effect a slow break between the bridging contact and fixed terminal. Electric arc generated during the break causes the deposition of contamination upon these separate break surfaces of the bridging contact and second fixed terminal, which surfaces are remote from the make and hold surfaces of the components. In this manner, electric arc contamination is not deposited on the initial make and hold surfaces during the break cycle of the switch.
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