Electromagnetic display device

Claim 1

AN ELECTROMAGNETIC DISPLAY DEVICE FOR DISPLAYING ALTERNATE VISUAL SIGNALS COMPRISING, AN ELECTROMAGNET INCLUDING FERRO-MAGNETIC POLE PIECES HAVING LIKE POLARITY, A CORE, A ROCKABLE DISPLAY MEMBER HAVING A PERMANENT MAGNET POSITIONED ADJACENT TO ONE END OF SAID CORE AND BETWEEN SAID POLE PIECES, SAID MAGNET HAVING TWO NORTH POLES AND TWO SOUTH POLES, EACH OF SAID MAGNET POLES LYING SUBSTANTIALLY EQUI-DISTANT FROM THE AXIS OF ROTATION, A LEVER SECURED TO THE MAGNET AND ROCKED BY IT, SAID LEVER FORMED WITH A GEAR SEGMENT ON ONE END THEREOF, A ROCKABLE SIGNAL MEANS HAVING INDICIA ON ITS OUTER SURFACE WHICH CAN BE VIEWED BY AN OBSERVER, SAID SIGNAL DEVICE INCLUDING A GEAR WHEEL WHOSE TEETH MESH WITH THE GEAR SEGMENT ON SAID LEVER COIL WINDINGS ON SAID CORE, TWO PAIRS OF INPUT TERMINALS FOR APPLYING ELECTRICAL OPERATING PULSES TO SAID COIL WINDINGS TO ROCK SAID DISPLAY MEMBER, TWO PAIRS OF CONTACTS MOUNTED ADJACENT TO SAID LEVER FOR ACTIVATING THE WINDINGS ON THE CORE, CONNECTING MEANS FOR FORMING TWO CIRCUITS, EACH INCLUDING TWO TERMINALS, A PAIR OF CONTACTS, AND ONE OF THE WINDINGS CONNECTED IN SERIES, AND MECHANICAL COUPLING MEANS BETWEEN SAID LEVER AND SAID PAIRS OF CONTACTS FOR OPENING ONE PAIR AND CLOSING THE OTHER PAIR WHEN THE LEVER IS ROCKED.