Electrical resistors – With switch
Patent
1978-02-21
1979-08-07
Tolin, Gerald P.
Electrical resistors
With switch
200 83P, 200 814, 200 83WM, H01H 3534
Patent
active
041639642
ABSTRACT:
The present invention relates to an improvement in pneumatic or hydraulic pressure sensors with several thresholds of response.
There often is a need for pressure sensors with several thresholds of response to predetermined pressure values. One such case exists with washing machines wherein loads at predetermined levels are required. The pressure sensor must therefore signal on the basis of the hydrostatic pressure the level of leading of the washing tub for the closing of, for example, an electric valve.
According to the present invention, the pressure sensor provides for a "lung" comprising an elastic membrane exposed to pressure, which acts on an element that operates a group of electromechanical switching elements, each of which is sensitive to a preestablished actuating force corresponding in turn to a given response pressure of the pressure sensor.
REFERENCES:
patent: 2302923 (1942-11-01), Zimarik
patent: 3177313 (1965-04-01), Klimak
patent: 3240895 (1966-03-01), Horowitz
patent: 3553402 (1971-01-01), Hire
patent: 3786210 (1974-01-01), Byam
patent: 3890477 (1975-06-01), Saunders
patent: 3973091 (1976-08-01), Kaminski
patent: 3984650 (1976-10-01), Budlane
Haug John A.
McAndrews James P.
Texas Instruments Incorporated
Tolin Gerald P.
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