Device for electromagnetically maintaining oscillating movement

Claim 1

IN A TIMEPIECE COMPRISING AN OSCILLATING REGULATING MEMBER AND A DEVICE FOR ELECTROMAGNETICALLY MAINTAINING THE OSCILLATING MOVEMENT OF SAID REGULATING MEMBER, SAID DEVICE COMPRISING A MAGNETIC FLUX GENERATOR AND A COIL, ONE OF WHICH TWO MEMBERS MOVES INTEGRALLY WITH SAID REGULATING MEMBER, WHILE THE OTHER IS STATIONARY, SO THAT THE INTERACTION OF THE MAGNETIC FLUX AND OF THE CURRENT FLOWING THROUGH SAID COIL SETS UP AN ELECTROMAGNETIC FORCE MAINTAINING THE MOVEMENT OF SAID REGULATING MEMBER OF THE TIMEPIECE, AN ELECTRIC CIRCUIT IN WHICH SAID COIL IS CONNECTED IN SERIES, A DIRECT-VOLTAGE SOURCE IN SAID CIRCUIT, AND BISTABLE MEANS IN SAID CIRCUIT, HAVING A NEGATIVE RESISTANCE FOR CERTAIN VALUES OF THE VOLTAGE OF SAID SOURCE, SAID BISTABLE MEANS BEING SO RESPONSIVE TO SUBTRACTION OF THE VOLTAGE INDUCED IN SAID COIL AS A RESULT OF VARIATIONS OF THE FLUX PASSING THROUGH THE COIL FROM THE VOLTAGE OF SAID SOURCE THAT CHANGE-OVER OF SAID BISTABLE MEANS OCCURS FROM ITS STABLE STATE DETERMINED BY ITS MAXIMUM RESISTANCE TO ITS STABLE STATE DETERMINED BY ITS MINIMUM RESISTANCE, WHILE ADDITION OF THE VOLTAGE INDUCED IN THE COIL TO THAT OF THE SOURCE PRODUCES CHANGE-OVER OF SAID BISTABLE MEANS FROM ITS STABLE STATE DETERMINED BY ITS MINIMUM RESISTANCE TO ITS STABLE STATE DETERMINED BY ITS MAXIMUM RESISTANCE.