Electronic vibration analyzing apparatus

Claim 1

IN ELECTRONIC VIBRATION ANALYZING APPARATUS, THE COMBINATION OF AN ELECTROMAGNETIC TRANSDUCER OPERATIVELY CONNECTED TO A ROTATING BODY TO BE BALANCED AND ADAPTED TO PRODUCE A DISPLACEMENT SIGNAL HAVING AN AMPLITUDE AND PHASE DEPENDENT UPON THE AMOUNT AND LOCATION OF UNBALANCE IN A ROTATING BODY, MEANS FOR PRODUCING A PULSE ONCE DURING EACH REVOLUTION OF THE ROTATING BODY, CIRCUIT MEANS RESPONSIVE TO SAID PULSE FOR PRODUCING TWO SINE WAVE SIGNALS EACH HAVING A FREQUENCY EQUAL TO THE SPEED OF ROTATION OF THE ROTATING BODY AND DISPLACED 90* IN PHASE WITH RESPECT TO EACH OTHER, A PAIR OF CIRCUIT DEVICES EACH RESPONSIVE TO SAID DISPLACEMENT SIGNAL AND AN ASSOCIATED ONE OF SAID SINE WAVE SIGNALS FOR PRODUCING A DIRECT CURRENT VOLTAGE, MEANS FOR INDICATING THE PHASE OF THE DISPLACEMENT SIGNAL WITH RESPECT TO THE SINE WAVE SIGNALS AND COMPRISING A POINTER MAGNETIZED TO PRODUCE NORTH AND SOUTH MAGNETIC POLES AT ITS OPPOSITE ENDS AND ROTATABLE ABOUT AN AXIS EXTENDING PERPENDICULAR TO A LINE DRAWN BETWEEN THE POLES, A PAIR OF INDUCTION COILS DISPOSED AT RIGHT ANGLES TO EACH OTHER IN A PLANE EXTENDING PARALLAL TO THE PLANE OF ROTATION OF SAID POINTER, THE AXES OF THE INDUCTION COILS INTERSECTING THE AXIS OF ROTATION OF THE POINTER, ANE MEANS CONNECTING THE INDUCTION COILS IN SERIES BETWEEN THE OUTPUTS OF SAID CIRCUIT DEVICES FOR PRODUCING DIRECT CURRENT VOLTAGES WHEREBY THE POINTER WILL ASSUME A POSITION ABOUT A COMPLETE 360* ARC INDICATIVE OF THE PHASE RELATIONSHIP BETWEEN THE DISPLACEMENT SIGNAL AND THE SINE WAVE SIGNALS.