Railroad flat wheel detectors

Railway switches and signals – Cab signal or train control – Train defect

Patent

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Details

246247, B61L 100

Patent

active

051335212

ABSTRACT:
A railroad flat wheel detector having a housing anchored to one side of a railroad rail enclosing an arrayed plurality of light source-photodetector pairs whose respective optic axes are tangent to the locus of the lower rim edge of passing wheels rolling along the track. The photodetector outputs are operatively connected to trigger a flat wheel alarm when the increased wheel flange rim overlap with the supporting rail, caused by a flat sector of a passing wheel, obscures a portion of the light and thereby briefly reduces the light intensity sensed by one or more of the plurality of photodetectors.

REFERENCES:
patent: 2429266 (1947-10-01), Gieskieng
patent: 3086109 (1963-04-01), Kaehms
patent: 3504173 (1970-03-01), Brinker
patent: 3558875 (1971-01-01), Gieskieng
patent: 3844513 (1974-10-01), Bernhardson et al.
patent: 3972021 (1976-07-01), Leitz et al.
patent: 4058279 (1977-11-01), Frielinghaus
patent: 4129276 (1978-12-01), Svet
patent: 4283031 (1981-08-01), Finch
patent: 4407072 (1983-10-01), Hoskins, Jr.
patent: 4524932 (1985-06-01), Bodziak
patent: 4696446 (1987-09-01), Mochizuki et al.
patent: 4701866 (1987-10-01), Harrison et al.
patent: 4781060 (1988-11-01), Berndt
patent: 4936529 (1990-06-01), Maine
"Bad Wheels Spotted in Motion", Railway Age, Dec. 16, 1963, pp. 23 and 30.

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