Multi-frequency railroad grade crossing termination shunt assemb

Details Multi-frequency railroad grade crossing termination shunt assemb Multi-frequency railroad grade crossing termination shunt assemb

1990-05-14

1991-07-09

Spar, Robert J.

Railway switches and signals

Electric automatic highway signals, mine doors, and gates

Car-actuated controller

246 34R, 333174, 333175, B61L 2922, H03H 700

Patent

active

050297805

ABSTRACT:
A multi-frequency shunt is provided for use between the rails of a railroad track to define the approach distance for a railroad crossing using a constant warning time or motion detection device. The shunt includes a housing with a PC board having rail terminals thereon being mounted in the housing. There are connections from the rail terminals of the PC board, extending outwardly through the housing, to the rails. The PC board includes a plurality of inductive and capacitive elements mounted thereon and connected to header terminals which are mounted on a header board. There are straps for interconnecting the header terminals with the interconnections between the header terminals determining which inductive and capacitive elements are connected between the rails and thus determining the nominal frequency of the shunt. There is a removable cover on the housing which permits access to the header board and the header terminals to provide for changing the nominal frequency of the shunt to correspond to the output frequency of the grade crossing predictor.

REFERENCES:
patent: 2129293 (1938-09-01), Weber
patent: 2506971 (1950-05-01), Robinson
patent: 3566312 (1971-02-01), McDonald
patent: 3752426 (1973-08-01), Pal
patent: 3777139 (1973-12-01), Peel
patent: 3944173 (1976-03-01), Moe et al.
patent: 3952977 (1976-04-01), Yermeulen
patent: 3955785 (1976-05-01), Yermeulen et al.
patent: 3977634 (1976-08-01), Smith
patent: 4324376 (1982-04-01), Kuhn
patent: 4453145 (1984-06-01), Schuster

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