Traveling sign controlled by logic circuitry and providing a plurality of digital display effects

Claim 1

A cover member for separating the illumination effects of adjacent lamps on an electrical display sign containing lamps arranged in columns and rows and for providing cooling of the lamps by natural convection comprising a front cover plate member, a back cover plate member arranged in parallel spaced-apart relationship to said front member, said front and back members each provided with a plurality of apertures arranged in columns and rows, the apertures equal in number and aligned with the lamps on the sign which protrude into the space between said front and back members, a plurality of intervening plate members positioned in parallel arrangement along the height of the cover member and perpendicular to said front and back members, said front and back members further provided with a plurality of slots arranged in columns aligned with said intervening plate members, said intervening plate members provided with a corresponding plurality of extending members aligned with the slots whereby upon assembly of the cover member the extending members pass through the slots and are thence twisted to provide a rigid cover member assembly, said extending members being retained after assembly of the cover member to function as cooling fins or being ground off to provide smooth surfaces on the front and back cover plate member and a plurality of tubes of length less than the distance between said front and back members, said tubes equal in number and aligned with the lamps on the sign, first ends of said tubes connected to the edges of the apertures in said front member and positioned between said front and back members and perpendicular thereto whereby the tubes separate the illumination effects of adjacent lamps, the spaces between the nonconnected second ends of the tubes and said back member forming channels for cooling the lamps by natural convection therethrough.