Electrical transmission or interconnection systems – Plural load circuit systems – Selectively connected or controlled load circuits
Patent
1978-06-09
1979-07-17
Pellinen, A. D.
Electrical transmission or interconnection systems
Plural load circuit systems
Selectively connected or controlled load circuits
200 819M, 323 19, 323 24, 323 39, 335205, 335207, 361180, H01H 3538, G05D 706
Patent
active
041616596
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: 3417255 (1968-12-01), Kuecken
patent: 3496380 (1970-02-01), Jones
patent: 3504235 (1970-03-01), Lee
patent: 3560846 (1971-02-01), Bessko
patent: 3568037 (1971-03-01), Williams et al.
patent: 3629678 (1971-12-01), Tyler
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patent: 4038926 (1977-08-01), Holberry
patent: 4071725 (1978-01-01), Smith et al.
GE SCR Manual, 3rd edition, 1964, pp. 106, 107.
Conley et al., "Magnetic Object Sensor", IBMTDB, vol. 5, No. 8, Jan. 1963, pp. 44, 45.
Burdick et al., "Reed Switch Contact Block", IBMTDB, vol. 9, No. 5, Oct. 1966, p. 512.
Pellinen A. D.
Scovill Manufacturing Company
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