Push button switch using dome spring and switch element thereof

Details Push button switch using dome spring and switch element thereof Push button switch using dome spring and switch element thereof

1986-10-16

1989-02-07

Luebke, Renee S.

Electricity: circuit makers and breakers

Snap

Double snap

200533, 200345, H01H 518

Patent

active

048033162

ABSTRACT:
A push button switch employing a dome spring switch element mounted in a vertical orientation relative to a generally horizontal orientation of a bottom support plate, and a key top and associated plunger which are mounted for limited, reciprocating vertical movement. An actuator, comprising a coil spring and a pivotally mounted lever, interconnects the plunger and the spring dome and is responsive to and converts vertical downward movement of the plunger to a horizontally directed depressing force on the dome spring for inverting the dome spring in a snap action and completing an electrical connection between inner and outer contacts mounted within the switch element and underlying the dome spring. A dome spring of rectangualr shape affords improved force versus displacement and snap action characteristics, and a contact frame providing flexible support of the inner contacts reduces impact shock and wear produced by the snap action. A locking structure provides for locked interengagement of the key top and plunger and a stepped, flexible stop absorbs shock and reduces impact noise in stopping the return movement of the plunger from a depressed to a normal condition. A direct drive connection between the plunger and the lever reduces the amount of plunger movement and depression force required to actuate the switch under abnormal load conditions. A process for fabrication of the switch element by stamping and molding steps reduces costs and improves reliability of the switch element.

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IBM Technical Disclosure Bulletin, vol. 21, No. 7, Dec. 1978, pp. 2949-2950; C. E. Norell et al.: "High Reliability Keyboard Button".
European Search Report, Berlin, 12-01-1987, Examiner Ruppert W. European Search Report, Berline, 02-03-1981, Examiner Ruppert.

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