Communications: electrical – External condition vehicle-mounted indicator or alarm – Transmitter in another vehicle
Patent
1993-11-09
2000-12-05
Hofsass, Jeffery A.
Communications: electrical
External condition vehicle-mounted indicator or alarm
Transmitter in another vehicle
340904, 340907, 246293, 246294, G08G 116
Patent
active
061573221
ABSTRACT:
An automated railroad crossing warning system includes a housing mounted at the intersection of a railroad track and a roadway with directional horns oriented in opposite directions to direct horn blasts along the roadway. A light is mounted on the housing for viewing by a railroad engineer. A control unit detects the presence of a train approaching the intersection and transmits a signal to the horns to activate the horns. A horn detector transmits a signal to the control unit upon activation of the horns at a predetermined decibel level. The control unit then activates the light such that the railroad engineer can visually determine that the horns at the intersection are being activated. The control unit includes an electronic circuit which causes the horns to produce blasts in a predetermined sequence which matches the conventional signal produced by a train engine upon approaching such a crossing.
REFERENCES:
patent: 3758775 (1973-09-01), Hopkins
patent: 3838271 (1974-09-01), Ackard et al.
patent: 3867719 (1975-02-01), Perrin
patent: 4090685 (1978-05-01), Pappas
patent: 4108405 (1978-08-01), Gibson
patent: 4942395 (1990-07-01), Ferarri et al.
Hofsass Jeffery A.
Holloway Russell
La Anh V.
Warren, Jr. Sanford E.
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