Means for maintaining spacing of a magnetic transducer from a rotary magnetic drum

Claim 1

RECORDING AND REPRODUCING APPARATUS COMPRISING IN COMBINATION: A ROTARY MAGNETIC STORAGE DRUM ADAPTED TO ROTATE ABOUT A SHAFT, A MAGNETIC TRANSDUCER MAGNETICALLY COACTING WITH THE SURFACE OF SAID DRUM, SUPPORT MEANS FOR SUPPORTING SAID TRANSDUCER, BIAS MEANS FOR URGING SAID TRANSDUCER AGAINST THE SURFACE OF SAID DRUM, A SPINDLE EXTENDING PARALLEL TO SAID SHAFT, A LEVER HAVING TWO ARMS, SAID ARMS BEING TORSIONALLY PIVOTED ABOUT SAID SPINDLE, A PIN FIXED IN POSITION ADJACENT TO AND BETWEEN ONE OF SAID ARMS AND SAID DRUM, SAID ONE ARM FLOATING ON SAID FLUID MEDIUM WHEN SAID DRUM IS ROTATING AND RESTING AGAINST SAID PIN WHEN THE THICKNESS OF THE FLUID MEDIUM IS REDUCED, THE OTHER OF SAID ARMS ENGAGING SAID SUPPORT MEANS AND RETAINING SAID TRANSDUCER AGAINST THE ACTION OF SAID BIAS MEANS IN A POSITION AWAY FROM THE SURFACE OF SAID DRUM WHEN THE LEVER IS PIVOTED IN RESPONSE TO A DECREASE IN THE THICKNESS OF SAID FLUID MEDIUM, SAID ONE ARM MAINTAINING THE OTHER OF SAID ARMS DISENGAGED FROM SAID TRANSDUCER AND SAID SUPPORT MEANS AND ALLOWING SAID TRANSDUCER TO FLOAT ON A FLUID MEDIUM ADJACENT TO SAID DRUM WHEN THE DRUM IS ROTATING.