Fail-safe magnetic sensing arrangement

Details Fail-safe magnetic sensing arrangement Fail-safe magnetic sensing arrangement

1980-12-22

1983-01-18

Robinson, Thomas A.

Railway switches and signals

Block-signal systems

Automatic

340 47, B61L 116, B61L 2100

Patent

active

043688624

ABSTRACT:
A fail-safe magnetic sensing arrangement including a first and a second object relatively movable in relationship to each other. The first object includes a magnetic structure having a permanent magnet and a pair of pole pieces to develop a magnetic field. The second object includes an a.c. oscillator which is coupled to an amplifier by a saturable reactor transformer and the amplifier feeds a negative d.c. maker which normally energizes a relay except when the saturable reactor transformer is saturated by the magnetic structure which signifies that the second object is in the vicinity of the first object.

REFERENCES:
patent: 2966582 (1960-12-01), Wachtel
patent: 3108771 (1963-10-01), Pelino et al.
patent: 3396271 (1968-08-01), Gallagher
patent: 3408493 (1968-10-01), Westover et al.
patent: 3588686 (1971-06-01), Lingmann et al.
patent: 3964703 (1976-06-01), Wilkas et al.

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