Variable inductor

Claim 1

A GANGED VARIABLE CONDUCTOR SUITED FOR MINIATURIZATION AND MASS-PRODUCIBLE, WHICH COMPRISES, IN COMBINATION, A SHAFT; A LOWER PLATE CONCENTRICALLY FASTENED TO SAID SHAFT; AN UPPER PLATE DISPOSED CONCENTRICALLY ABOUT SAID SHAFT AND ROTATABLE RELATIVE TO, AND IN INTIMATE CONTACT WITH, SAID LOWER PLATE; BOTH SAID PLATES BEING MADE OF A MAGNETIC MATERIAL AND HAVING CONTACT SURFACES WHICH ARE LAP-FINISHED TO AN OPTICALLY FLAT PLANE; MECHANICAL ELASTIC FORCE MEANS IMPARTED FROM THE EXTERIOR OF SAID PLATES TO THE EXTENT THAT SAID CONTACT SURFACES OF SAID PLATES ARE PLACED AT A DISTANCE AT WHICH SAID PLATES ARE MUTUALLY DRAWN TOGETHER BY MOLECULAR ATTRACTION; SAID LOWER PLATE HAVING AT LEAST TWO CARVED-OUT PORTIONS IN PERPENDICULAR DIRECTION TO THE PLANE OF ROTATION THUS PROVIDING PROTRUDING CORES SEPARATED FROM SAID SHAFT AND LYING IN THE SAME PLANE THEREWITH; A COIL WOUND ABOUT EACH OF SAID CORES, A CLOSED MAGNETIC CIRCUIT BEING FORMED WHEN SAID UPPER PLATE CONTACTS SAID CORES; SAID UPPER PLATE HAVING ONE INCLINED SURFACE CONTACTING SAID LOWER PLATE PER EACH SAID CORE; SAID INCLINED SURFACES BEING OF SECTOR SHAPE IN PLAN VIEW, STARTING FROM THE THINNEST PORTION OF SAID UPPER PLATE WHICH IS THE PORTION HAVING THE MAXIMUM GAP WITH RESPECT TO ITS CORRESPONDING PROTRUDING CORE, SAID SECTOR BEING CUT OUT TO FORM A REGION WHEREIN THE EFFECTIVE GAP VALUE APPROACHES INFINITY; SAID INCLINED SURFACES HAVING A RADIUS SUBSTANTIALLY EXTENDING FROM THE AXIS OF ROTATION TO THE CENTER OF THE CORRESPONDING CORE IN CIRCUMFERENTIAL DIRECTION SO THAT THE GAP FORMED BETWEEN SAID UPPER PLATE AND SAID PROTUDING CORES OF SAID LOWER PLATE IS VARIED BY THE ROTATION OF SAID UPPER PLATE RELATIVE TO SAID LOWER PLATE, SAID VARIATION BEING ABLE TO EXCEED 120 DEGREES, THE PORTIONS OF SAID UPPER PLATE WITHOUT INCLINATION MAKING CLOSE BEING VARIED BY THE ROTATION OF SAID UPPER PLATE ABOUT SAID LOWER PLATE.