Torque and speed measuring instrument

Claim 1

APPARATUS FOR SIMULTANEOUSLY INDICATING TORQUE AND SPEED COMPRISING A TORQUE GENERATOR CONSTITUTED BY A THREE PHASE ELECTRIC MOTOR HAVING THREE STATOR WINDINGS AND A ROTOR MOUNTED ON A DOUBLE ENDED SHAFT EXTENDING FROM BOTH ENDS OF SAID MOTOR, SAID WINDINGS BEING CONNECTED TO A THREE-PHASE POWER SOURCE HAVING VOLTAGE ADJUSTING MEANS WHEREBY SAID SHAFT ROTATES IN ACCORDANCE WITH THE POWER SUPPLIED BY SAID SOURCE, MEANS MECHANICALLY TO COUPLE ONE END OF SAID SHAFT TO A LOAD TO BE TESTED, RECTIFIER AND FILTER MEANS RESPONSIVE TO THE ALTERNATING CURRENT DRAWN BY SAID WINDINGS TO PRODUCE A DIRECT CURRENT AS A FUNCTION OF MOTOR TORQUE, A DIRECT-CURRENT METER TO READ SAID DIRECT CURRENT TO PROVIDE A TORQUE INDICATION, A LIGHT CHOPPER DISC MOUNTED ON THE OTHER END OF SAID SHAFT AND INCLUDING RADIAL SLOTS AT ONE DEGREE INTERVALS THEREON, A LIGHT SOURCE ARRANGED TO PROJECT LIGHT THROUGH SAID SLOTS, A PHOTO DETECTOR TO INTERCEPT SAID LIGHT PROJECTED THROUGH SAID DISC, MEANS COUPLED TO SAID DETECTOR AND RESPONSIVE TO THE REPETITION RATE OF THE PULSES PRODUCED THEREIN TO PRODUCE A DIRECT CURRENT WHOSE INTENSITY IS IN ACCORDANCE WITH SAID RATE, AND A DIRECT CURRENT METER RESPONSIVE TO SAID DIRECT CURRENT TO PRODUCE A SPEED INDICATION.