Electric switch construction

Electricity: circuit makers and breakers – Multiple circuit control – Reciprocating contact

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Details

174 51, 200 1B, 200 6176, 200159R, 200276, H01H 316, H01H 1364, H01H 1506, H01H 902

Patent

active

046509364

ABSTRACT:
An electric switch construction having a housing with electric terminals, two concentric springs disposed in the housing and respectively connected with the terminals, and a movable contactor cup adapted to establish continuity between the terminals and a conductive, barrel 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 plunger carries an O-ring which forms a partial seal along the bore of the housing, so as to minimize the accumulation of dirt or moisture from the surfaces where electrical contact is made or broken. 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 surface against which the cup is seated. As a result, improved 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.

REFERENCES:
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patent: 2317727 (1943-04-01), Bonanno
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patent: 3710048 (1973-01-01), Schumacher
patent: 3792219 (1974-02-01), Rowley
patent: 4022999 (1977-05-01), Brown
patent: 4308440 (1981-12-01), Buttner
patent: 4319106 (1982-03-01), Armitage
patent: 4476359 (1984-10-01), Bienwald

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