Electric switch construction

H - Electricity – 01 – H

Patent

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306/328

H01H 13/52 (2006.01) H01H 3/16 (2006.01) H01H 13/06 (2006.01) H01H 13/20 (2006.01)

Patent

CA 1285593

ELECTRIC SWITCH CONSTRUCTION Abstract An electric switch construction having a housing with electric terminals, two concentric springs disposed in the housing and respectively connected with the ter- minals, and a movable contactor cup adapted to establish continuity between the terminals and a conductive, bar- rel portion of the housing. The outer spring biases the cup to a circuit-closing position wherein both terminals are connected to the barrel portion of the housing. A manually-engageable plunger is arranged to engage the cup. When the plunger is actuated, first one terminal is disconnected from the barrel portion of the switch, and subsequently, upon further movement of the plunger, the remaining terminal is disconnected therefrom. The plung- er carries an O-ring which forms a partial seal along the bore of the housing, so as to minimize the accumula- tion of dirt or moisture from the surfaces where electri- cal contact is made or broken. The advantage of the pres- ent invention over the devices of the prior art is that as the switch is operated, the plunger tends to rotate the cup in small increments, such that different contact points on the cup are presented to the cooperable sur- face against which the cup is seated. As a result, im- proved conductivity is had over extended periods of use. In addition, the seal of the switch minimizes problems that normally occur in harsh environments such as are encountered in the automotive field.

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