Fluid blending apparatus using digital computing means

Claim 1

MATERIAL BLENDING APPARATUS FOR BLENDING TWO MATERIALS IN PREDETERMINED PROPORTIONS COMPRISING: A PAIR OF TURBINE FLOW METERS FOR DEVELOPING SEPARATE DIGITAL ELECTRIC SIGNALS THE NUMBER OF PULSES OF WHICH ARE PROPORTIONAL TO THE QUANTITY OF THE SEPARATE MATERIALS BLENDED, A PAIR OF COMPUTING TOTALIZERS FOR DIVIDING THE SEPARATE DIGITAL SIGNALS BY FACTORS OPERABLE TO PRODUCE AN IDENTICAL NUMBER OF SIGNAL PULSES FROM THE COMPUTING TOTALIZERS WHEN THE MATERIALS ARE BLENDED IN THE PREDETERMINED PROPORTIONS, EACH OF SAID COMPUTING TOTALIZERS COMPRISING THREE BINARY CODED DECIMAL COUNTING STAGES AND AN "AND" GATE CONNECTED TO THE DECIMAL COUNTING STAGES BY FACTOR SWITCHES FOR PROVIDING AN OUTPUT PULSE FORM THE "AND" GATE AFTER ANY PREDETERMINED NUMBER OF PULSES ARE RECEIVED BY THE COMPUTING TOTALIZERS WHICH PREDETERMINED NUMBER IS SELECTED BY SETTING OF THE FACTOR SWITCHES, A POTENTIOMETER INCLUDING A ROTATABLY MOUNTED COIL, A VARIABLE POSITION ARM AND A CENTER TAP, A SOURCE OF UNIDIRECTIONAL ELECTRICAL ENERGY IN SERIES WITH THE COIL, MOTOR MEANS CONNECTED TO THE POTENTIOMETER COIL FOR PRODUCING ROTATION THEREOF IN OPPOSITE DIRECTIONS AND MEANS FOR APPLYING THE DIGITAL SIGNALS FROM THE COMPUTING TOTALIZERS TO SAID MOTOR MEANS FOR PRODUCING ROTATION OF THE COIL IN A DIRECTION AND OF A MAGNITUDE CONTROLLED BY THE NUMBER OF PULSES APPLIED THERETO FROM THE COMPUTING TOTALIZERS AND A SERVO VALVE CONNECTED BETWEEN THE CENTER TAP OF THE POTENTIOMETER AND THE VARIALBE POSITION ARM THEREOF RESPONSIVE TO ROTATION OF THE POTENTIOMETER COIL AND THE RESULTING DIRECTION OF MOVEMENT OF THE ARM FROM THE CENTER CAP FOR VARYING THE RELATIVE QUANTITY OF THE MATERIALS BLENDED TO MAINTAIN THE PREDETERMINED PROPORTIONS OF THE BLENDED MATERIALS.