Coil spring for key switch

Details Coil spring for key switch Coil spring for key switch

1986-11-24

1988-03-22

Recla, Henry J.

Electricity: circuit makers and breakers

Electric switch details

Actuators

200159B, 200276, H01H 312

Patent

active

047330368

ABSTRACT:
A key switch is disclosed which employs a coil spring formed of a spring element and which has a smaller-diameter portion, a conical portion joined to one end of the smaller-diameter portion, and a larger-diameter portion joined to the other end of the smaller-diameter portion. The smaller-diameter portion has the spring element coiled at a relatively small diameter. The conical portion has the spring element extending coiled so as to increase its diameter progressively toward an open end thereof. The larger-diameter portion has a diameter larger than the diameter of the smaller-diameter portion. The conical portion is maintained under compression and the small-diameter portion is maintained in proximity to a contact area by elements of the key switch to provide a linearly increasing depression force for the key switch.

REFERENCES:
patent: 3721784 (1973-03-01), Viracola
patent: 4468542 (1984-08-01), Pounds
patent: 4529848 (1985-07-01), Cherry

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