Railway switches and signals – Block-signal systems – Automatic
Patent
1976-12-06
1977-10-11
Kunin, Stephen G.
Railway switches and signals
Block-signal systems
Automatic
246 37, 246 63C, B61L 2322
Patent
active
040531287
ABSTRACT:
A stretch of railway track, has a high frequency track circuit transmitter and receiver and a cab signal transmitter coupled across track rails at each of several locations marking the ends of track sections along a stretch of railway track. Each location has an impedance bond having a primary winding connected across the track rails and having toroid secondary windings tuned to assigned distinctive high frequencies for coupling a track transmitter and a track receiver to the track rails. A loop circuit is also provided at each location, including a tuned loop, for inductively coupling a cab signal code transmitter to the track rails independent of the impedance bond. The tuned toroid coils and the loop circuit are connected in series to one end of a two wire line circuit, which, at its other end, is connected to a track circuit high frequency transmitteer, a track circuit receiver, and a cab signal transmitter connected in multiple.
REFERENCES:
patent: 3501629 (1970-03-01), Aiken
patent: 3524054 (1970-08-01), Smith
patent: 3794833 (1974-02-01), Blazek et al.
patent: 3949959 (1976-04-01), Rhoton et al.
Frielinghaus Klaus H.
Wilcox Clinton S.
General Signal Corporation
Kleinman Milton E.
Kunin Stephen G.
Wynn Harold S.
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