Railway switches and signals – Block-signal systems – Automatic
Patent
1978-01-19
1979-05-29
Blix, Trygve M.
Railway switches and signals
Block-signal systems
Automatic
246247, 246249, B61L 116
Patent
active
RE0300128
ABSTRACT:
A variable permeability magnetic object detection device including an electromagnetic sensing coil; a core disposed in the electromagnetic sensing coil having a first permeability when the core is magnetically saturated and a second different permeability when the core is magnetically unsaturated; a magnetic member proximate the electromagnetic sensing coil for providing a magnetic field in the core for operating the core in a magnetically saturated state without a magnetic object to be detected present in the area proximate the electromagnetic sensing coil, interacting with the magnetic field, and for operating the core in a magnetically unsaturated state with the magnetic object to be detected present in the area proximate the magnetic sensing coil, interacting with the field; and a detector responsive to said electromagnetic sensing coil to detect the presence of a magnetic object.
REFERENCES:
patent: 3015725 (1962-01-01), Hofstetter
patent: 3058059 (1962-10-01), Bockemuehl
patent: 3509469 (1970-04-01), Strange
patent: 3792241 (1974-02-01), Sullivan
patent: 3941338 (1976-03-01), Knudsen
Kapsambelis Christos B.
Reynolds Christopher C.
Tuhro Richard H.
Wilkas Joseph R.
Blix Trygve M.
Computer Identics Corporation
Eisenzopf Reinhard J.
Iandiorio Joseph S.
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