Railway switches and signals – Block-signal systems – Automatic
Patent
1989-10-06
1992-03-10
Spar, Robert J.
Railway switches and signals
Block-signal systems
Automatic
246 34R, B61L 2108
Patent
active
050944134
ABSTRACT:
A device for protecting track relays from electrical disturbances originating from a train's traction current. The device has: a control signal generator; a signal inverter, to invert periodically the polarity of the signal emitted; and a receiver for the control signal. A distinguishing circuit is provided downstream from the receiver for assessing the frequencies forming the receive signal and switching the track relay to the "line clear" position only after recognition of the frequencies forming the periodically inverted control signal.
REFERENCES:
patent: 3715669 (1973-02-01), LaForest
patent: 3927851 (1975-12-01), Wilcox
patent: 3958781 (1976-05-01), Woods et al.
patent: 3970271 (1976-07-01), Auer et al.
patent: 3986691 (1976-10-01), Ehrlich et al.
patent: 4065081 (1977-12-01), Huffman et al.
patent: 4089495 (1978-05-01), Knight
patent: 4188002 (1980-02-01), Gilcher
patent: 4349170 (1982-09-01), Bilet et al.
patent: 4417229 (1983-11-01), Wilson
patent: 4432517 (1984-02-01), Ripamonti
patent: 4442988 (1984-04-01), Laurent et al.
patent: 4494717 (1985-01-01), Corrie et al.
patent: 4535959 (1985-08-01), Gilcher
patent: 4582279 (1986-04-01), Pontier
Bailey Esacontrol S.p.A.
Burns Robert E.
Lobato Emanuel J.
Lowe Scott L.
Spar Robert J.
LandOfFree
Device for the protection of track relays from electrical distur 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 the protection of track relays from electrical distur, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for the protection of track relays from electrical distur will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2280847