Railway switches and signals – Block-signal systems – Automatic
Patent
1976-11-29
1978-02-21
Kunin, Stephen G.
Railway switches and signals
Block-signal systems
Automatic
246 34CT, B61L 2106
Patent
active
040748790
ABSTRACT:
A track circuit signalling system for an electrified rapid transit system using significantly fewer components is provided. Instead of a transmitter and receiver at each track circuit boundary, alternate boundaries have transmitters only; and the intermediate boundaries have two receivers. The coupling units for the two receivers are more economical than the prior art coupling unit for coupling the transmitter-receiver combination. The transmitters on each side of a receiver pair transmit signals on different carrier frequencies. Each transmitter transmits in both directions from its location. Of the two receivers at a given boundary, one is tuned to respond to signals from the transmitter on one side, while the other receiver of the pair is tuned to respond to signals from the transmitter on the other side. For special applications using overlapping track circuits, selected transmitters may be omitted and a single receiver used on each side of the omitted transmitter.
REFERENCES:
patent: 1710499 (1929-04-01), Lewis
patent: 3046392 (1962-07-01), Luft
patent: 3529150 (1970-09-01), Coupin
patent: 3794833 (1974-02-01), Blazek
Clark Gary E.
Frielinghaus Klaus H.
Smith Barry L.
Eisenzopf Reinhard J.
General Signal Corporation
Killian George W.
Kleinman Milton E.
Kunin Stephen G.
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