Electricity: circuit makers and breakers – Fluid pressure – Diaphragm
Patent
1982-06-22
1984-09-25
Scott, J. R.
Electricity: circuit makers and breakers
Fluid pressure
Diaphragm
200 83B, 200 83J, 200 83P, 200 83A, H01H 3534
Patent
active
044737297
ABSTRACT:
A sealed pressure-responsive switch is manually resettable and trip-free. The switch has a separate snap-acting, bistable, dished metal disc or disc element disposed between a sealed snap-acting pressure-responsive diaphragm and a spring-biased switch arm. The disc moves to an inverted dished configuration with snap action to move the switch arm to a trip position against the arm bias when the diaphragm moves in response to application of a selected fluid pressure. The disc remains in its inverted shape to releasably hold the arm in tripped position until the switch is manually reset even when the diaphragm returns to its original position after removal of the selected fluid pressure from the diaphragm. A push button or push button means is selectively movable to apply a force to the disc sufficient to restore the disc to its original disc configuration after the fluid pressure is removed from the diaphragm, thereby to permit the switch arm to reset in response to its spring bias and provide trip-free manual reset switch operation.
REFERENCES:
patent: 2230770 (1941-02-01), Van Almelo
patent: 2331826 (1943-10-01), Davenport
patent: 3052777 (1962-09-01), Meisenheimer, Jr. et al.
patent: 3436503 (1969-04-01), Moody
patent: 3584168 (1971-06-01), Halpert et al.
patent: 3781744 (1973-12-01), Olson
Kummer Stanley F.
Strasser Werner
Ting Youn H.
Haug John A.
McAndrews James P.
Scott J. R.
Sharp Melvin
Texas Instruments Incorporated
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