Shutter type digital clocks

Details Shutter type digital clocks Shutter type digital clocks

1977-11-21

1979-12-18

Dobeck, B.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

58 50R, 58 23R, 340764, G04C 1702

Patent

active

041787528

ABSTRACT:
The clock comprises a display substrate having hour, ten minutes and minute display members each constituted by a plurality of display digit openings which are arranged in the form of a letter 8, a light diffusion plate situated on the back of the display substrate and formed with a plurality of shutter guide openings corresponding to respective display members, a lamp house block positioned to the rear of the light diffusion plate and provided with a plurality of lamp openings corresponding to respective display members, a plurality of lamps received in the lamp openings, a frame for supporting the display substrate, the light diffusion plate and the lamp house block, a plurality of shutter units positioned to the rear of the lamp house block and extending to the front surface of the light diffusion plate, each shutter unit including a plurality of shutter members cooperating with the display digit openings for selectively opening and closing the same, and a plurality of cam control mechanisms associated with a synchronized digit shift mechanism for controlling the positions of respective shutter members of the shutter units.

REFERENCES:
patent: 3683523 (1972-08-01), Boyles
patent: 3683524 (1972-08-01), Polonsky
patent: 3721087 (1973-03-01), Boyles
patent: 3965668 (1976-06-01), Tomokazu

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