Multiple detent membrane switch

Details Multiple detent membrane switch Multiple detent membrane switch

1997-06-26

1998-10-20

Friedhofer, Michael A.

Electricity: circuit makers and breakers

Multiple circuit control

Sequential operations

200 5A, 200513, H01H 1314

Patent

active

058249788

ABSTRACT:
An improved membrane switch includes multiple detents. A pair of electric circuits are completed by the membrane switch. The switch includes the pair of open electric circuits, three flexing areas, and two membrane contacts. Normally the flexing areas bias the membrane contacts out of contact with the electric circuits. When a first actuation force is applied to the membrane, the intermediate flexing area flexes allowing the first circuit to be complete by the first membrane contacts. When a second actuation force is applied to the membrane, the center and outer flexing areas flex allowing the second circuit to be completed by the second membrane contacts. The inventive membrane switch provides the operator with a clear indication and a detent feel for each of the two circuits.

REFERENCES:
patent: 3996429 (1976-12-01), Chu et al.
patent: 4376238 (1983-03-01), Martin
patent: 4668843 (1987-05-01), Watanabe et al.
patent: 5313027 (1994-05-01), Inoue et al.
patent: 5350890 (1994-09-01), Fairbrother et al.
patent: 5510584 (1996-04-01), Norris
patent: 5559311 (1996-09-01), Gorbatoff
United States Patent Application, Multiple Detent Membrane Switch, AG-1357 IC-EM, Ser. No.: 08/680,623, Filed: Jul. 17, 1996 Inventor: Jonathan Dahlstrom.

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