Communications: electrical – Selective – Having indication or alarm
Patent
1984-09-21
1986-11-04
Crosland, Donnie L.
Communications: electrical
Selective
Having indication or alarm
340 52H, 340903, 340905, 180271, 180275, B60Q 100, G08G 116
Patent
active
046212523
ABSTRACT:
For indicating whether a vehicle can pass through a bridge, a radio transmitter is positioned adjacent the bridge to generate radio signals which are encoded with information as to the height of the bridge as presented to vehicles. A vehicle is provided with a radio receiver capable of receiving and decoding the signals from the transmitter, and comparing the height information so derived with pre-encoded information as to the height of the vehicle. A warning signal is produced in the event that the comparison indicates a danger that the vehicle cannot safely pass under the bridge. The technique is also applicable to railway crossings where a transmitter is positioned at the crossing to generate ratio signals indicative of approach of a train so that the receiver on the vehicle may provide a warning of such approach of a train on decoding the radio signals.
REFERENCES:
patent: 3419847 (1968-12-01), Bonney
patent: 3689882 (1972-09-01), Dessailly
patent: 3716833 (1973-02-01), Roth
patent: 3824469 (1974-07-01), Ristenbatt
patent: 3899671 (1975-08-01), Stover
patent: 3978447 (1976-08-01), Bankes
patent: 4307375 (1981-12-01), Marshall, Sr.
Braun Manfred E.
Donlon Kieran J.
Johns David G.
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