Display device with sliding back plates

Details Display device with sliding back plates Display device with sliding back plates

1976-05-03

1977-09-13

Pitrelli, John F.

Card, picture, or sign exhibiting

Check, label, or tag

Reinforced

40 36, G09F 930, G09F 1129

Patent

active

040473147

ABSTRACT:
An opaque face plate has arrays of openings which are arranged to depict numerals when light is transmitted through predetermined openings. A plurality of back plates are slideably mounted behind the face plate, each back plate having an array of light passages, some of which are elongated slots, and said light passages being arranged to coact with face plate openings to form numerals. Some of the face plate openings are arranged in upright line formation, and the slots are inclined at a relatively small acute angle with respect to said upright lines. Each back plate is slideable in a direction defined by the direction of the inclined slots, and is moved back and forth in intermittent steps along its path of movement to cause the numerals to change in accordance with the time of day.

REFERENCES:
patent: 1114267 (1914-10-01), Jones
patent: 1172360 (1916-02-01), Hildburgh
patent: 1594703 (1926-08-01), Ballerini
patent: 3399475 (1968-09-01), Rinder
patent: 3742631 (1973-07-01), Hasala
patent: 3783539 (1974-01-01), Trame
patent: 3961434 (1976-06-01), Sampon

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