Motive means for electrically controlling distance between a body and object

Claim 1

A DEVICE FOR CONTROLLING THE DISTANCE OF AS OBJECT FROM A REFERENCE BODY COMPRISING A PROBE SUPPORTING SAID OBJECT IN CAPACITIVE RELATIONSHIP WITH SAID BODY, SAID CAPACITIVE RELATIONSHIP DEPENDENT ON SAID DISTANCE, AN OSCILLATOR HAVING A TANK CIRCUIT AND A COIL WITHIN SAID TANK CIRCUIT FORMING THE PRIMARY OF A TRANSFORMER, MEANS FOR REFLECTING THE CAPACITIVE IMPEDANCE OF SAID PROBE ACROSS SAID TANK CIRCUIT, THE RESONANT FREQUENCY OF SAID TANK CIRCUIT BEING DEPENDENT ON THE VALVE OF SAID CAPACITIVE IMPEDANCE, A FREQUENCY DISCRIMINATOR HAVING A RESONANT CIRCUIT AND A PAIR OF BIFILAR WOUND COILS IN SAID RESONANT CIRCUIT, MEANS FOR SIMULTANEOUSLY AND EQUALLY VARYING THE IMPEDANCE OF SAID COILS, ANOTHER COIL FORMING THE SECONDARY OF SAID TRANSFORMER AND SERIES CONNECTED BETWEEN SAID PAIR OF COILS, SAID FREQUENCY DISCRIMINATOR RESONANT CIRCUIT BEING TUNED TO A RESONANT FREQUENCY CORRESPONDING TO A PREDETERMINED DISTANCE OF SAID OBJECT FROM SAID REFERENCE BODY, SAID FREQUENCY DISCRIMINATOR HAVING A D.C. OUTPUT CORRESPONDING TO A VIBRATION FROM SAID PREDETERMINED DISTANCE, AND MOTIVE MEANS FOR RETURNING SAID OBJECT TO SAID PREDETERMINED DISTANCE.