Railway switches and signals – Signals – Highway crossing
Patent
1988-11-10
1990-01-23
Kashnikow, Andres
Railway switches and signals
Signals
Highway crossing
246125, 315200A, B61L 512, B41L 904, H05B 4134
Patent
active
048953253
ABSTRACT:
A railroad crossing gate arm electrical lamp system provides two flashing lamps and one continuously operated lamp. Each of the lamps has an internal electrical circuit with the internal electrical circuits being identical for each lamp. This permits the lamps to be interchanged in position with the lamp positions determining the function of the lamp. Each lamp electricl circuit has a three-wire input connection and a three-wire output connection. There are identical and reversible three-wire cables connecting the first flashing lamp with the second flashing lamp and the second flashing lamp with the continuously operated lamp. The input for the first flashing lamp includes two power supply terminals and a third common terminal. The lamps are connected in series across the power supply and a relay alternately shunts the lamps to obtain flashing of two of the lamps. The third lamp is connected across the power supply for steady light.
REFERENCES:
patent: 1989357 (1935-01-01), Griswold
patent: 2137196 (1938-11-01), Sampson
patent: 2203988 (1940-06-01), Griswold
patent: 3139556 (1964-06-01), Grentkowski
patent: 3994457 (1976-11-01), Teasel
patent: 4090685 (1978-05-01), Pappas
patent: 4666108 (1987-05-01), Fox
patent: 4703303 (1987-10-01), Snee
Kashnikow Andres
Newholm Timothy
Safetran Systems Corporation
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