Electricity: circuit makers and breakers – Fluid pressure – Diaphragm
Patent
1978-07-24
1980-03-25
Tolin, Gerald P.
Electricity: circuit makers and breakers
Fluid pressure
Diaphragm
200 83J, H01H 3534
Patent
active
041952090
ABSTRACT:
A pressure responsive switch for changing electrical state in response to a fluid pressure which equals or exceeds a desired pressure threshold level includes a cylindrical conductive casing. The casing defines a central, generally cylindrical cavity and at least one upper fluid inlet orifice. The casing further defines a lower opening communicating with the cavity. A non-conductive elastic membrane extends across the upper portion of the cavity beneath the fluid inlet orifice and is sealingly attached at its periphery to the interior of the casing. A conductive, pressure actuatable plunger in the upper portion of the cavity includes a pressure receiving surface directly beneath the membrane. An electrical connector is mounted by a bushing means centrally in the cavity. The connector is held out of electrical contact with a casing and has a first end extending out of the cavity through the lower opening in the conductive casing and a second end which is positioned in the cavity. A conductive spring means in the cavity provides an electrical path between the conductive casing and the plunger and applies a predetermined upward force to the plunger, urging the plunger out of contact with the second end of the connector. When the fluid admitted by the fluid inlet orifice reaches the desired pressure threshold level, the plunger will be moved downward by the fluid pressure against the force of the spring means, such that the plunger will contact the second end of the connector and provide an electrical path between the connector and the casing. The second end of the connector and the plunger thus define first and second switch contact means.
REFERENCES:
patent: 3786210 (1974-01-01), Byam
patent: 4038506 (1977-07-01), Filip
Emerson Electric Co.
Tolin Gerald P.
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