Electricity: power supply or regulation systems – Remote sensing
Patent
1977-12-05
1979-07-17
Pellinen, A. D.
Electricity: power supply or regulation systems
Remote sensing
200 819M, 323 39, 335205, 335207, 361180, H01H 3538, G05D 706
Patent
active
041616855
ABSTRACT:
A magnetic proximity sensing apparatus for sensing ferro-magnetic objects is especially well adapted for use with fluid cylinders having pistons formed from magnetically attracted material. The apparatus includes a magnetic actuator responsive to the proximity of the fluid cylinder piston or other ferro-magnetic object which closes a switch and enables electrical circuitry for controlling fluid valves or other apparatus. A reed switch mounted within a hollow, cylindrical, permanent magnet has a separate pole piece secured at one end of the reed switch. The proximity of a ferro-magnetic object changes the flux within the magnet, closing the reed switch. The circuitry is solid state and includes a silicon controlled rectifier acting as a gated switch for completing the circuit.
REFERENCES:
patent: 3305805 (1967-02-01), Tann
patent: 3363073 (1968-01-01), Bouguet
patent: 3368140 (1968-02-01), Tobey
patent: 3504235 (1970-03-01), Lee
patent: 3560846 (1971-02-01), Bessko
patent: 3629678 (1971-12-01), Tyler
patent: 3919629 (1975-11-01), Scruggs
patent: 3967224 (1976-06-01), Seeley
patent: 4038926 (1977-08-01), Holberry
GE SCR Manual, 3rd Edition, 1964, pp. 38, 257, 258.
Burdick et al., "Reed Switch Contact Block", IBMTDB, vol. 9, No. 5, Oct. 1966, p. 512.
Conley et al., "Magnetic Object Sensor", IBMTDB, vol. 5, No. 8, Jan. 1963, pp. 44, 45.
Publication J. R. Tepco Inc., "Self Contained Proximity Switches", 300 Series Ferrous Metal AC Proximity Switches, (date not known).
Ibec Industries, Inc.
Pellinen A. D.
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