Pressure sensitive switch

Electricity: circuit makers and breakers – Fluid pressure – Diaphragm

Patent

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Details

N01H 3538

Patent

active

041601394

ABSTRACT:
A pressure sensitive switch for indicating when a fluid pressure reaches a predetermined limit includes a housing having a top wall and a dielectric substrate within the housing spaced from the top wall. A metal diaphragm is hermetically bonded to the substrate to form a cavity between the top wall and the diaphragm. The diaphragm includes a major resilient portion which deforms responsive to varying fluid pressures within the cavity. A first contact is fixedly mounted relative to the substrate and a second contact, arranged for movement with the deformable diaphragm, is spaced from the first contact in juxtaposition thereto. When the fluid pressure within the cavity reaches a predetermined limit, the second contact engages the first contact to close the switch. When the fluid pressure is below the predetermined limit, the second contact moves with the diaphragm away from the first contact to open the switch.
Also disclosed is a barometric version wherein the inside of the diaphragm is partially evacuated and atmospheric pressure outside the cavity works against the diaphragm to open and close the switch.

REFERENCES:
patent: 2131264 (1938-09-01), Benjamin
patent: 2270608 (1942-01-01), Sandberg
patent: 2967944 (1961-01-01), Lusted
patent: 3562456 (1971-02-01), Rogers
patent: 3743801 (1973-07-01), Brobeck
patent: 3814877 (1974-06-01), Alverez
patent: 4038506 (1977-07-01), Filip

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