Electricity: circuit makers and breakers – Fluid pressure – Piston
Patent
1987-05-21
1988-07-05
Tolin, G. P.
Electricity: circuit makers and breakers
Fluid pressure
Piston
200 82C, 200 83J, 73745, H01H 3538
Patent
active
047556382
ABSTRACT:
There is provided a hydraulic pressure operated electrical switch having a spring biased piston which is movable by the force of the hydraulic pressure of the fluid to be sensed to activate a microswitch. The pressure required to move the piston can be altered by adjusting the force produced by the spring acting on the piston. An operating pressure differential is provided by a diaphragm which operates to move the piston by reason of the hydraulic pressure exerted thereon. The diaphragm has a spring rate and produces a force in conjunction with the spring bias against the piston when the piston is moved as a result of the hydraulic pressure overcoming the spring bias. The spring rate of the diaphragm is affected by the amount of hydraulic pressure exerted thereon so that, as a result of adjusting the operating pressure of the switch, the operating differential pressure is altered.
REFERENCES:
patent: 2808484 (1957-10-01), Beck
patent: 3516279 (1970-06-01), Maziarka
patent: 3848517 (1974-11-01), Hawke
patent: 4184809 (1980-01-01), Kelley
patent: 4317971 (1982-03-01), Roth
patent: 4438305 (1984-03-01), Johnson
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