Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1974-04-25
1976-02-17
Schaefer, Robert K.
Electricity: circuit makers and breakers
Liquid contact
Time delay
200 76, H01h 1326
Patent
active
039393186
ABSTRACT:
An electrical push-button switch in which the push button has a shank extending through a passage in the switch housing for engaging an electrical contact set. The passage through which the shank extends has a series of notches around the periphery for receiving one end of a pair of springs, the other end of each spring is attached to the shank. The springs have an N-shaped configuration with an extension at one end of the N. A pair of complimentary stationary portions of the switch housing extend in the path of and engage the extended portions of the springs after the push button is depressed. The initial depression of the push button causes the shank to move against the tension of the springs until a changeover point is reached, thereafter the push button movement is assisted by the springs for a further period of travel. Upon additional movement, the extensions on the springs then contact the complimentary extending portions of the housing so that further movement of the shank is now opposed by the action of the springs. The switch is designed so that the shank then comes in contact with and depresses the set of electrical contacts. The contact restoring springs operate to return the button to its initial rest position and are assisted by the tension created in the aforementioned push-button springs in cooperation with said extended portions of the housing.
REFERENCES:
patent: 2967218 (1961-01-01), Dorjee
patent: 3402374 (1968-09-01), Gaines et al.
patent: 3764761 (1973-10-01), Poltorak et al.
Brown John Graham
Stocker John Peter
International Standard Electric Corporation
Lombardi, Jr. Menotti J.
Menelly Richard A.
O'Halloran John T.
Schaefer Robert K.
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