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US 3,951,364 AGranted
Track circuit
AssigneeGeneral Signal Corporation
InventorHenry C. Sibley
Life of this patent
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AssigneeGeneral Signal Corporation
InventorHenry C. Sibley
Estimating the term…
There is described a track circuit for use with a track section which may or may not include a switch. The system detects the presence of a railroad vehicle within the track section as it constitutes a shunt across the track. The track section is divided into a plurality of segments with each segment having a common boundary with at least one other segment. Alternating current signals are induced into each track segment and a sensor is provided for sensing and responding to the induced a.c. signals. A modulator is provided for intermittently affecting the sensed signal and a detector is provided for detecting and responding to the changing signal. The detected signals are gated through a logic circuit which provides first and second outputs indicating: the changes are as might be anticipated as a result of the modulation introduced; or, the changes are other than might be anticipated as a result of the modulation, respectively. The shunting effect of a railroad vehicle in any segment will cause the production of the second type of output signal and, therefore, the second type of output signal is an indication of a railroad vehicle within the track section.
A railroad track circuit for detecting the presence of a railroad vehicle shunt across the rails and within the limits of a track section, said track section having ends defined by shorting bonds across the rails and comprising in combination:
A railroad track circuit for detecting the presence of a railroad vehicle shunt across the rails and within the limits of a track section, said track section having ends defined by shorting bonds across the rails and comprising in combination;
Dependencies are inferred from the claim text.