Spring-biased push-button switch having a spring-loaded tactile

Details Spring-biased push-button switch having a spring-loaded tactile Spring-biased push-button switch having a spring-loaded tactile

1989-03-03

1990-05-22

Luebke, Renee S.

Electricity: circuit makers and breakers

Solid contact

Membrane type

2002761, 200430, 200457, 200521, H01H 1328

Patent

active

049279904

ABSTRACT:
A push-button switch comprises a fixed electrode; a movable electrode disposed opposite to the fixed electrode; a key housing having a tubular spring retainer, and an annular guide wall surrounding the tubular spring retainer and having a stopping flange, a coil spring received in the tubular spring retainer, and a key for operating the movable electrode through the coil spring. The coil spring has a large coil section, a middle extension coil section, and a small compression coil section having a projecting part. The tubular spring retainer is provided with a protrusion on the inner circumference thereof. When the key is depressed to close the switch, the projecting part of the coil spring is forced to move down over the protrusion in a snap motion, and the projecting part is forced to move up over the protrusion by the contractive force of the middle extension coil section and the recoiling force of the small compression coil section of the coil spring when the key is released. Thus, the operation of the switch can be detected by the sense of touch.

REFERENCES:
patent: 4034177 (1977-07-01), Sims, Jr.
patent: 4136569 (1979-01-01), Hollweck
patent: 4529848 (1985-07-01), Cherry
patent: 4540865 (1985-09-01), Calder
patent: 4751355 (1988-06-01), Wisskirchen et al.
patent: 4755645 (1988-07-01), Naoki et al.

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