Electricity: circuit makers and breakers – Fluid pressure – Diaphragm
Patent
1975-08-12
1977-02-08
Tolin, Gerald P.
Electricity: circuit makers and breakers
Fluid pressure
Diaphragm
200 67R, H01H 3534
Patent
active
040073440
ABSTRACT:
A pressure operated electrical switch construction having a housing provided with a pressure responsive actuator and an electrical switch operatively associated with the actuator so that the actuator will operate the switch from one condition thereof to another condition thereof when the sensed pressure reaches a predetermined pressure. A reset device is carried by the housing for resetting the switch from the other condition thereof back to the one condition thereof. A range spring is carried by the housing for acting on the actuator to provide the predetermined pressure. A reset spring, forming part of the reset device, acts on the actuator to reset the switch. The two springs are concentrically disposed with one of the springs being disposed completely inside the other spring to render the switch construction compact even though the switch construction has a fixed reset or a proportional reset. An adjustable cam is carried by the housing and adjusts the range spring when the cam is moved relative to the housing in one direction and operates the reset device when moved in a direction transverse to the one direction thereof.
REFERENCES:
patent: 2620413 (1952-12-01), Johnson
patent: 2919321 (1959-12-01), Lung
patent: 3345480 (1967-10-01), Zeller
Robertshaw Controls Company
Tolin Gerald P.
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