Sign construction for photographic transparencies

Details Sign construction for photographic transparencies Sign construction for photographic transparencies

1986-11-21

1988-04-26

Hirsch, Paul J.

Card, picture, or sign exhibiting

Signs

Stretched or tensioned

40564, 40624, G09F 1700

Patent

active

047395680

ABSTRACT:
A sealed backlit sign frame having a photographic transparency as the viewing face of the frame is provided. Lights are provided behind the transparency for illumination. A partial vacuum or negative pressure is created in the frame and bows the transparency inwardly. This bowing action stabilizes the transparency and prevents wind induced undulations. Exhaust blowers and air vent dampers are provided to maintain the negative pressure in the frame. The blowers, dampers and lights are preferably controlled by a suitable control system.

REFERENCES:
patent: 2637132 (1953-05-01), Helms et al.
patent: 3934365 (1976-01-01), Stein et al.
patent: 3977111 (1976-08-01), Fritts
patent: 3998522 (1976-12-01), Holzel
patent: 4022522 (1977-05-01), Rain
patent: 4185408 (1980-01-01), Tracy
patent: 4362591 (1982-12-01), Tracy
patent: 4368587 (1983-01-01), Childs
patent: 4372071 (1983-02-01), Vicino

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