Train approach detector

Railway switches and signals – Electric automatic highway signals – mine doors – and gates – Normally closed track circuit

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

246 34CT, 246125, 246128, 307260, 324 76R, 330107, B61L 102, B61L 112, B61L 2106

Patent

active

043657770

ABSTRACT:
A train approach detector uses frequencies in the audio spectrum to activate grade crossing protection devices in advance of and during the presence of railroad trains at grade crossings. The detector is completely solid state, and includes one transmitter and one receiver each connected to the tracks so that transmitted and received track signals, which are partially pulse modulated for optimum filtering and signal coupling and minimum third harmonic radiation, appear on opposite sides of the crossing. The section of track between the transmitter and receiver is designated as a crossing island and sections of rail outside of the island are known as approaches. In addition to its basic train movement detection function, the detector contains additional features that are designed to provide operation under a variety of application conditions, including automatic ballast compensation, loss of shunt, low signal/low gain condition, high signal/broken rail condition, delayed pick-up, delayed drop-out and reverse switch override, and bi-directional motion detection.

REFERENCES:
patent: 3246143 (1966-04-01), Steele et al.
patent: 3614418 (1971-10-01), Pell
patent: 3619604 (1971-11-01), Auer et al.
patent: 3706098 (1972-12-01), Geiger
patent: 3740550 (1973-06-01), Geiger
patent: 3777139 (1973-12-01), Peel
patent: 3781541 (1973-12-01), Darrow et al.
patent: 3820100 (1974-06-01), Ballinger et al.
patent: 3838270 (1974-09-01), Ballinger et al.
patent: 3850390 (1974-11-01), Geiger
patent: 3929307 (1975-12-01), Geiger
patent: 3944173 (1976-03-01), Moe et al.
patent: 3974991 (1976-08-01), Geiger
patent: 3977634 (1976-08-01), Smith
patent: 3987989 (1976-10-01), Geiger
patent: 4172576 (1979-10-01), Svet et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Train approach detector does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Train approach detector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Train approach detector will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1333927

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.