Card – picture – or sign exhibiting – Changing exhibitor – With electric circuit control
Patent
1978-10-11
1980-09-30
Pitrelli, John F.
Card, picture, or sign exhibiting
Changing exhibitor
With electric circuit control
40507, 3403781, G09F 900
Patent
active
042247527
ABSTRACT:
An indicating device including an indicator having a plurality of information bearing surfaces adapted to be movable from a first position to a plurality of second positions. The indicating device includes an armature member coupled to the indicator and adapted to pivot about an axis with the armature member having a plurality of radially extending armature pole pieces disposed at its opposite ends. A stator member having a plurality of pole pieces disposed adjacent each armature pole piece and in a spaced apart relation therefrom such that when the armature member pivots about is axis, one of the armature pole pieces rotates toward one of the stator pole pieces, and the other of the armature pole pieces rotates away from the other of the stator pole pieces. A plurality of windings disposed about the stator are adapted to generate magnetic fields which are coupled through the stator pole pieces to the armature pole pieces thereby attracting one armature pole piece and simultaneously repelling the other armature pole piece causing the armature member to pivot about its axis and the indicator to move from a first position to a second position.
REFERENCES:
patent: Re24943 (1961-02-01), Skrobisch
patent: 994992 (1911-06-01), Fisher
patent: 1298871 (1919-04-01), Bobroff
patent: 1308658 (1919-07-01), Carr
patent: 2588183 (1952-03-01), Vigon
patent: 2779016 (1957-01-01), Snell
patent: 3309696 (1967-03-01), Alster et al.
patent: 3616555 (1971-11-01), Campbell
patent: 3950031 (1966-05-01), Bowman
Page Engineering Company (Sunbury-on-Thames), Ltd.
Pitrelli John F.
Skillington G. Lee
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