Measuring and testing – Fluid pressure gauge – Diaphragm
Patent
1985-03-18
1986-04-15
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
Diaphragm
73115, 200 83J, 336 30, 338 32H, G01L 910
Patent
active
045819416
ABSTRACT:
A pressure switch and transducer arrangement combines into a single unit both a power contact switch for providing power to an automobile fuel pump in response to a predetermined minimum oil pressure and a magnet/Hall effect sensor for providing an analog signal indicative of the oil pressure for use by the automobile on-board microcomputer. The arrangement includes an actuator rod movable by a diaphragm in response to oil pressure. The end of the rod remote from the diaphragm is coupled to a contact washer for providing the power switching function and also to a magnet which cooperates with a fixed Hall effect sensor, which sensor provides an output corresponding to the air gap between the magnet and the sensor. The magnet and the washer are coupled to the actuator rod in such a manner that even after the washer makes contact with the power switching terminals, the actuator rod and magnet are free to continue moving as the oil pressure continues to increase.
REFERENCES:
patent: 4192191 (1980-03-01), Nelson
patent: 4326419 (1982-04-01), Herden
patent: 4343180 (1982-08-01), Herden et al.
patent: 4430900 (1984-02-01), Valbjorn
patent: 4484173 (1984-11-01), Everett
Lee Lui M.
Obermann George
Bell Edward L.
Controls Company of America
Davis David L.
Smith Robert E.
Woodiel Donald O.
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