Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1978-04-21
1979-05-29
Pitts, Harold I.
Communications: electrical
Audible indication
Percussion-type sound producer
3403782, 340166R, G08B 522
Patent
active
041568729
ABSTRACT:
A drive is provided for a rotatably mounted display element which is distinctively colored on opposite sides and having a magnet rotatable therewith defining a magnetic axis transverse to the axis of rotation, a pole piece of reversible permanently magnetizable material, designed so that the reversible field of said pole piece will produce opposite orientations of said display element, a coil for energizing said pole piece. There is provided means for determining from the characteristics of current resulting from voltage applied to said coil whether or not the polarity of said pole piece is being reversed.
REFERENCES:
patent: 4069480 (1978-01-01), Helwig
Ferranti-Packard Limited
Pitts Harold I.
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