Lighting system for roadside signs

Electric lamp and discharge devices: systems – With radiant energy sensitive control means – Electric switch controlled by the radiant energy responsive...

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Details

315 82, 362802, B60Q 102, H05B 4136

Patent

active

050217151

ABSTRACT:
A system including a telescopic switch and method of operation is disclosed for intermittently illuminating a roadside sign in response to a vehicle passing along a selected portion of the road, the system including a lighting element for illuminating the sign and a telescopic switch including a circuit for transmitting the control signal to the lighting element, a photocell for initiating the control signal and a telescopic lens for focusing the photocell on the selected road portion whereby the photocell is capable of sensing lights on a vehicle passing along the selected road portion in order to initiate the control signal and cause the lighting element to illuminate the sign.

REFERENCES:
patent: 2986689 (1961-05-01), Hofer
patent: 3720913 (1973-03-01), Bradford
patent: 4249160 (1981-02-01), Chilvers
patent: 4384317 (1983-05-01), Stackpole

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