Switch with conical spring actuator

Details Switch with conical spring actuator Switch with conical spring actuator

1983-08-22

1985-07-16

Scott, J. R.

Electricity: circuit makers and breakers

Multiple circuit control

Multiple switch

200DIG1, 200159B, 200340, 361288, H01H 1370, H01G 501

Patent

active

045298483

ABSTRACT:
A capacitive or a membrane switch is provided with a coil spring which has a conical base and a top cylindrical portion. The spring biases a switch key to its rest position. When the key is pressed, the conical base is compressed to provide an exponentially increasing counter-force and to actuate the switch at a predetermined actuation point. After the switch is actuated, the key continues to move and compresses the cylindrical portion of the spring to provide a linearly increasing counter-force which indicates overtravel operation of the switch.

REFERENCES:
patent: 3707609 (1972-12-01), Dapot et al.
patent: 3806673 (1974-04-01), Boulanger
patent: 3842230 (1974-10-01), Kushio
patent: 4417115 (1983-11-01), Desmarais et al.
patent: 4458293 (1984-07-01), Cherry
patent: 4466046 (1984-08-01), Cherry
IBM Technical Disclosure Bulletin, vol. 24, No. 8, (Jan., 1982).

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