Electromagnetic device for maintaining the oscillatory movement of a balance wheel comprising a hair spring

Claim 1

IN AN ELECTRIC DEVICE FOR MAINTAINING OSCILLATING MOVEMENT, SAID DEVICE COMPRISING A BALANCE WHEEL HAVING A HAIR SPRING, THREE MAGNETIC ELEMENTS ON SAID BALANCE WHEEL, OF WHICH AT LEAST ONE IS A PERMANENT MAGNET, SAID PERMANENT MAGNET BEING POLARIZED ON AN AXIS PARALLEL TO THE AXIS OF SAID BALANCE WHEEL AND SAID THREE ELEMENTS BEING SO DISPOSED THAT THE DIRECTION OF FLUX THROUGH AN INTERMEDIATE ONE OF THE THREE ELEMENTS IS OPPOSITE TO THAT OF THE OUTER TWO ELEMENTS, A TRANSISTOR AND A DIRECT-VOLTAGE SOURCE CONNECTED TO SAID TRANSISTOR, AND TWO MAGNETICALLY CORELESS WINDINGS DISPOSED OPPOSITE EACH OTHER, EACH IN A PLANE PERPENDICULAR TO THE AXIS OF SAID BALANCE WHEEL AND SO CONNECTED WITH SAID TRANSISTOR THAT IN MOVEMENT OF SAID MAGNETIC ELEMENTS RELATIVE TO SAID WINDINGS, FOR EACH HALF-CYCLE OF OSCILLATION OF THE BALANCE WHEEL, EACH OF TWO PULSES OF LIKE POLARITKY COMPRISED IN VOLTAGE INDUCED IN ONE OF SAID TWO WINDINGS AS THE RESULT OF FLUX VARIATIONS THROUGH SAID WINDING PROMPTED BY DIFFERENT RELATIVE POSITIONS OF SAID MAGNETIC ELEMENTS TO SAID WINDING, IS AMPLIFIED IN THE OTHER OF SAID WINDINGS CAUSING A CURRENT IMPULSE AND AN ACCOMPANYING LAPLACE EFFECT ENDOWING THE BALANCE WHEEL WITH A MECHANICAL IMPULSE IN THE DIRECTION THAT THE WHEEL IS MOVING IN THE CORRESPONDING HALF-CYCLE OF OSCILLATORY MOVEMENT.