Electricity: circuit makers and breakers – Solid contact – Push button operated
Patent
1988-06-09
1990-04-10
Cusick, Ernest G.
Electricity: circuit makers and breakers
Solid contact
Push button operated
74110, 200531, 200536, 200539, 200565, 200571, H01H 342
Patent
active
049162764
ABSTRACT:
A push lock mechanism including a heart-shaped cam groove, a driving pin adapted to trace in the heart-shaped cam groove, and an axially reciprocatable operation shaft adapted to be locked in a depressed position thereof by cooperation of the heart-shaped cam groove and the driving pin. The improvement comprising a slider having the heart-shaped cam groove on its peripheral surface and arranged around the operation shaft, a first return spring for biasing the slider in a reverse direction of the operation shaft, a driving member provided so as to project therefrom for transmitting power between the operation shaft and the slider, and a second return spring for biasing the driving member in such a direction as to urge the same against the slider, which second return spring has a spring force set to be smaller than a spring force of the first return spring, wherein when the operation shaft under a locked condition of the slider is moved in the reverse direction, the driving member is moved away from the slider to release abutment of the driving member against the slider.
REFERENCES:
patent: 3639714 (1972-02-01), Fujimoto et al.
patent: 3704353 (1972-11-01), Halla
patent: 4071720 (1978-01-01), Krujci et al.
patent: 4449022 (1984-05-01), Uno et al.
patent: 4467159 (1984-08-01), Ota et al.
patent: 4528545 (1985-07-01), Lang
patent: 4616116 (1986-10-01), Sato
patent: 4636601 (1987-01-01), Tanabe
Alps Electric Co.
Cusick Ernest G.
Shoup Guy W.
Winters Paul J.
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