Railway switches and signals – Block-signal systems – Automatic
Patent
1975-01-09
1976-04-20
Blix, Trygve M.
Railway switches and signals
Block-signal systems
Automatic
246 40, B61L 2106
Patent
active
039513645
ABSTRACT:
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.
REFERENCES:
patent: 3450874 (1969-06-01), Whitten
patent: 3663809 (1972-05-01), Sibley
patent: 3683176 (1972-08-01), Crofts
patent: R27472 (1972-09-01), Thorne-Booth
Blix Trygve M.
Eisenzopf Reinhard J.
General Signal Corporation
Killian George W.
Kleinman Milton E.
LandOfFree
Track circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Track circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Track circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1581317