Keying contact assembly

Details Keying contact assembly Keying contact assembly

1974-04-10

1976-06-01

Hohauser, Herman

Electricity: circuit makers and breakers

Liquid contact

Time delay

H01H 312

Patent

active

039611477

ABSTRACT:
A keying contact assembly, for providing a valid indication of contact closure after effectuating the closure of a contact pair, includes a resilient bulb coupled to one end thereof adjacent to the contact pair. The resilient bulb has negative force displacement characteristics. Upon actuation of the keying contact assembly, the resilient bulb is moved to engage and close the contact pair. After the contact pair has been closed and a subsequent predetermined key force is reached, the resilient bulb utilizes its negative force displacement characteristics to provide tactile feedback through the keying contact assembly to indicate contact closure. The resilient bulb also damps the closed contact pair to prevent bounce and premature opening of the contact pair.

REFERENCES:
patent: 3603756 (1971-09-01), Carpentier
patent: 3668356 (1972-06-01), Kekas
patent: 3773998 (1973-11-01), Seegar et al.
patent: 3829632 (1974-08-01), Klehm, Jr.
Mathewson et al., IBM Tech. Disc. Bull., vol. 15, No. 10, Mar. 1973, pp. 3162-3163.
Jarvis et al., IBM Tech. Disc. Bull., vol. 13, No. 7, Dec. 1970, p. 1755.

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