Railroad switch point position indicator

Details Railroad switch point position indicator Railroad switch point position indicator

1998-09-03

2000-11-21

Le, Mark T.

Railway switches and signals

Electric actuation

Switch signals

246253, 246476, B61L 500

Patent

active

061491063

ABSTRACT:
A fixed rail mounted railroad switch point indicator is provided, wherein proximity detectors are mounted to the fixed stock rail to sense the position of the switch relative to those stock rails. Preferably, eddy current sensors are used as the proximity sensors to indicate the distance of the switch points relative to the fixed rails. A microprocessor converts a current reading from the proximity detectors into the distance measurement, such as by indicating an "on/off" state of the sensor. Additionally, the microprocessor provides information as to the operation of the sensors to provide the reliability of the signals received.

REFERENCES:
patent: 4005839 (1977-02-01), Frank
patent: 5116006 (1992-05-01), Ocampo
patent: 5192038 (1993-03-01), Ocampo
patent: 5253830 (1993-10-01), Nayer et al.
patent: 5598992 (1997-02-01), Chew
patent: 5622340 (1997-04-01), Turner et al.
patent: 5806809 (1998-09-01), Danner
patent: 6062514 (2000-05-01), McQuistian

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