Pressure switch apparatus having improved longevity and widened

Details Pressure switch apparatus having improved longevity and widened Pressure switch apparatus having improved longevity and widened

1988-03-18

1989-08-29

Tolin, Gerald P.

Electricity: circuit makers and breakers

Fluid pressure

Diaphragm

H01H 3540

Patent

active

048619531

ABSTRACT:
An automotive transmission control is shown having pressure switches to sense the state of actuation of solenoid valves to provide logic signals to a microprocessor type of transmission control. The pressure switches, which sense the pressure of hydraulic fluid controlled by the solenoid valves, use a dished shaped metallic diaphragm characterized in that the pressure-deflection curve of the center of the diaphragm has minimal hysteresis and reflects that the diaphragm is relatively stiff having a positive coefficient of pressure with increasing deflection up to and above a selected pressure level at which level the center accelerates between d.sub.1 and d.sub.2. The diaphragm is loosely held on a conductor at 0 psig with the fluid pressure when it increases forcing the diaphragm into sealing and electrical engagement with the conductor.

REFERENCES:
patent: 4211901 (1980-07-01), Matsuda
patent: 4220836 (1980-09-01), Hersey
patent: 4386247 (1983-05-01), Couat
patent: 4521651 (1985-06-01), Matsumoto
patent: 4591677 (1986-05-01), Hirota
patent: 4620073 (1986-10-01), Yokota

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