Display device with orbitally movable plates
AssigneeEverbrite Electric Signs, Inc.
InventorCharles E. Trame
Life of this patent
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Abstract
An opaque face plate has arrays of openings which are each arranged to form numerals when light is transmitted through a predetermined selection of openings. A plurality of opaque back plates are movably mounted behind the face plate, each back plate having an array of openings positioned to coact with face plate openings to form different numerals depending upon the position of movement of the back plate. Each back plate is driven in an orbital path in a plane parallel to the plane of the face plate by means which includes a slot in the back plate, and cam means coacting with said slot.
Claims7
In a display device having an opaque face plate, at least one array of openings formed in said face plate, said openings being arranged to form indicia when light is transmitted through a predetermined group of said openings, an opaque back plate movably mounted adjacent to said face plate, an array of openings formed in said back plate and positioned to coact with the openings in said face plate to form said indicia, and means for orbitally moving said back plate with respect to said face plate, the improvement wherein said means includes a first gear wheel rotatably mounted adjacent to said back plate, a second gear wheel rotatably mounted adjacent to said back plate in mesh with said first gear wheel, first eccentric drive means between said first gear wheel and one portion of said back plate, second eccentric drive means between said second gear wheel and another portion of said back plate which is spaced from said first eccentric drive means, and means for rotating one of said gear wheels to move said back plate in an orbital path.
Dependencies are inferred from the claim text.