Communications: electrical – Selective – Having indication or alarm
Patent
1976-05-03
1978-09-19
Caldwell, Sr., John W.
Communications: electrical
Selective
Having indication or alarm
246186, 246 29R, 340539, 343711, 343841, G08G 100, H04B 726
Patent
active
041157575
ABSTRACT:
A warning system suitable for use with lift trucks, or the like, which routinely transverse hazardous, blind or otherwise dangerous intersections. The system includes a transmitter, which is mounted atop the roll cage of the lift truck, and a receiver which is fixedly mounted within the corresponding zone of the intersection. The transmitter derives its primary power from the vehicle via the vehicle seat switch and radiates a suitable carrier signal through an antenna network which is integral with the transmitter housing. The carrier signal is suitably modulated or encoded by means of a secure modulation format such as FSK. The receiver is disposed at the approximate center of the intersection and includes a carrier and a modulation decoder. The decoded output of the receiver is used to control a visual indicator such as a strobe light. The output of the transmitter is adjusted by way of its antenna network and the receiver sensitivity is further adjusted to establish the desired range limits.
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Caldwell Sr. John W.
Groody James J.
Michals William J.
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