Railway switches and signals – Block-signal systems – Automatic
Patent
1977-01-12
1978-04-25
Kunin, Stephen G.
Railway switches and signals
Block-signal systems
Automatic
104149, 246 74, 246182B, 246187B, B61L 108
Patent
active
040859134
ABSTRACT:
A device for preventing collision of trains includes two units, a stationary signal sending unit mounted on the wayside and a moving control unit mounted on the locomotive. The signal sending unit including the traffic light system transmits a D. C. voltage, zero, positive, or negative value, representing red, yellow, or green traffic light, to the control unit through two contacts, one mounted on the wayside and one mounted on the locomotive. The control unit includes an electro-responsive valve, the air brake system of the train, and four speed-switches. The electro-responsive valve is connected by a pipe to the air brake system of the train. Openings of the electro-responsive valve will cause brake applications. The so organized device will cause the train to stop if the train runs through a red traffic light, and will cause the train to restrict its run under a pre-set low speed limit after passing the red traffic light. It will also cause the train to slow down if the train's speed is higher than the pre-set speed limit when passing a yellow traffic light. A green traffic light will cause the device to reset itself to a non-activated state.
REFERENCES:
patent: 1648527 (1927-11-01), Wyant
patent: 1686434 (1928-10-01), Bushnell
patent: 1865278 (1932-09-01), Rosenthal
patent: 1877555 (1932-09-01), Bushnell
patent: 2291372 (1942-07-01), Bushnell
patent: 2554056 (1951-05-01), Peter et al.
patent: 3253143 (1966-05-01), Hughson
patent: 3272980 (1966-08-01), Freeman
patent: 3410996 (1968-12-01), Carrino
patent: 3700886 (1972-10-01), Birkin
patent: 3710100 (1973-01-01), Perry
patent: 3790780 (1974-02-01), Helmcke et al.
LandOfFree
Device for preventing collision of trains does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device for preventing collision of trains, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for preventing collision of trains will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2419019