Railway switches and signals – Electric actuation – Car-actuated circuit controllers
Patent
1981-11-19
1984-09-04
Groody, James J.
Railway switches and signals
Electric actuation
Car-actuated circuit controllers
246 28K, 246 34CT, 246122R, 246125, B61L 1108, B61L 1304
Patent
active
044692986
ABSTRACT:
A sensor arrangement is disclosed for detecting the presence of an axle of a rail vehicle in a short length of a track. The arrangement includes a bridge coupled to and including resistances of the rail upon which the vehicle travels. This bridge is unbalanced by wheels of an axle shunting resistance of the bridge with the bridge unbalance producing an output indicative of the presence of the axle. Two such arrangements displaced relative to each other will enable detecting the direction of movement of the vehicle. This sensor arrangement contains no electric components on the rail and is insensitive to interference from rail currents and electromagnetic rail brakes.
REFERENCES:
patent: 2892078 (1959-06-01), Orthuber
patent: 2993116 (1961-07-01), Utt
patent: 3752426 (1973-08-01), Pal
patent: 4200855 (1980-04-01), Gilcher
patent: 4392626 (1983-07-01), Pascoe
Groody James J.
Hill Alfred C.
International Standard Electric Corporation
O'Halloran John T.
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