Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1974-07-15
1976-02-03
Pitts, Harold I.
Communications: electrical
Audible indication
Percussion-type sound producer
340378R, G08B 524
Patent
active
039368181
ABSTRACT:
An electromagnetic indicator assembly includes a nonmagnetic angle plate defining a support frame for axially parallel spaced rotors each including a permanent magnet and a nonmagnetic plate circumferentially surrounding a portion of the magnet. The rotors carry symbols for display at window openings in the support frame. Another angle plate made of magnetic metal has stamped laterally spaced integral fingers defining magnetic cores carrying magnetizing coils axially perpendicular to the rotors. Ends of the cores serve as abutments for spaced edges of the rotor plates to stop rotation thereof. Adjacent cores are oppositely magnetized and adjacent rotors are oppositely magnetized to prevent rotation of adjacent rotors when any one rotor is selectively turned to display a symbol. The coils may be energized to hold the rotors latched against rotation in both stationary positions; or may be energized only for the purpose of turning a rotor to display a symbol, with the rotor returning to an original stationary position magnetically when the coil is deenergized.
REFERENCES:
patent: 3543202 (1970-11-01), Naybor
Pitts Harold I.
The Staver Company, Incorporated
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