Vital wheel detector

Details Vital wheel detector Vital wheel detector

1995-12-12

1997-05-13

Le, Mark T.

Railway switches and signals

Electric actuation

Car-actuated circuit controllers

246122R, 324179, 340941, B61L 100

Patent

active

056284799

ABSTRACT:
A vital wheel detector for railways injects an oscillating electrical current into a short rail segment and produces a monitor signal in response the magnetic field around the rail. A high Q pickup coil is employed which, when a car wheel is present on the rail segment, sharply decreases in Q and significantly reduces the level of the monitor signal. Any failure of the detector apparatus is in a safe mode, as a loss of rail current results in a loss of the monitor signal whether through an electrical or a mechanical failure. Also, internal mechanical or electrical failures either interrupt the current to the rail or interrupt transmission of the monitor signal to the processing logic.

REFERENCES:
patent: 4200856 (1980-04-01), Gilcher
patent: 4351504 (1982-09-01), Frielinghaus
patent: 4469298 (1984-09-01), Uebel
patent: 5129606 (1992-07-01), Rodems et al.
patent: 5333820 (1994-08-01), Gilcher
patent: 5395078 (1995-03-01), Gellender

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