Changeable display unit for use in a sign device

Details Changeable display unit for use in a sign device Changeable display unit for use in a sign device

1987-06-19

1989-04-25

Caldwell, Sr., John W.

Communications: electrical

Visual indication

Movable

340763, 340783, 3408151, 40449, G09G 334

Patent

active

048252050

ABSTRACT:
A changeable display unit for use in a sign device which comprises a case containing an electromagnet disposed therein and extending along the opposite sides thereof, the case including a case aperture disposed at the front side thereof, a fixed plate containing a plate aperture disposed at the center thereof, the fixed plate being bent at its center to form wing portions which extend therefrom, the fixed plate being attached to the case so that their respective apertures coincide, a movable plate rotably attached to the fixed plate at the center thereof, the movable plate containing a circular permanent magnet disposed therewithin whereby when the electromagnet is activated, the movable plate is selectively moved between the wing portions of the fixed plate whereby the opposite sides of the movable plate containing desired images are selectively displayed.

REFERENCES:
patent: 3648281 (1972-03-01), Dahms et al.
patent: 4000476 (1977-02-01), Romney
patent: 4128825 (1978-12-01), Madsen
patent: 4176345 (1979-11-01), Micheron et al.

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