Edge lighted sign

Details Edge lighted sign Edge lighted sign

1981-06-22

1984-03-06

Lechert, Jr., Stephen J.

Illumination

Automatic substitution of power supply or light source

362 31, 362184, 362190, 362200, 362208, 362227, 362249, 362251, 362252, 362276, 362375, 362802, 362806, 362812, 40574, F21V 1904

Patent

active

044357435

ABSTRACT:
A lighted exit sign comprising a light transmitting plate having a viewing side and upper and lower edges onto which light can be projected for transmission into the plate for viewing from the viewing side. Upper and lower printed circuit boards are supported close to the upper and lower edges of the plate. A plurality of small incandescent light bulbs are secured to the upper and lower circuit boards for producing light when energized for projection onto the upper and lower edges for transmission into the plate for viewing from the viewing side. A white, light reflecting layer is formed on the side of the plate opposite the viewing side. The letters EXIT are formed on the viewing side in two layers. The first layer is white in color and is secured directly to the viewing side. The second layer is preferably red in color and is secured to the first layer. A transformer is employed for converting an A C voltage to a level below the rated voltage of the bulbs and to a level above the rated voltage of the bulbs. The A C voltage below the rated voltage of the bulbs is employed for normally energizing said bulbs. The A C voltage above the rated voltage of the bulbs is rectified and applied to maintain batteries charged. In the event that the A C power fails, a switching system connects the batteries to the bulbs to energize them with a voltage greater than their rated voltage.

REFERENCES:
patent: 2994148 (1961-08-01), Endelson
patent: 4201005 (1980-05-01), Hunt
patent: 4272901 (1981-06-01), Matthews

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