Card – picture – or sign exhibiting – Changing exhibitor – Alphanumeric device
Patent
1985-11-27
1987-09-22
Swiatek, Robert P.
Card, picture, or sign exhibiting
Changing exhibitor
Alphanumeric device
340764, G09F 900
Patent
active
046945997
ABSTRACT:
An electromagnetic indicator capable of binary indication including a rotatably mounted semicircular flag assembly which can rotate between a first position ("set") and a second position ("fault") upon the receipt by the indicator of an electrical signal. A portion of the flag assembly is permanently magnetized and is magnetically latched in either the "set" or "fault" position by a magnetic latch which is preferably comprised of a bracket and core bar. The bracket has two ends which are positioned so that they are adjacent the magnetized portion of the flag assembly. The core bar is magnetically connected to an electromagnet and is also positioned adjacent a magnetized portion of the flag assembly. When the electromagnet is connected to the appropriate terminal of an electrical power source, the electromagnet generates a magnetic field, magnetizes the two ends of the bracket means and the core bar, and causes the flag assembly to flip from the "set" position to the "fault" position, or vice versa. After the electromagnet is disconnected from source, the flag assembly is magnetically latched in either the "set" or "fault" position by the magnetic attraction between the bracket, and the core bar on the one hand and the magnetized portion of the flag assembly on the other hand.
REFERENCES:
patent: 3295238 (1967-01-01), Winrow
patent: 3422426 (1969-01-01), Bailey et al.
patent: 3624941 (1971-12-01), Chantry
patent: 4259801 (1981-04-01), Ito
Ambrozaitis John J.
Hart Robert D.
Minelco Inc.
Stone Cary E.
Swiatek Robert P.
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