Auxiliary load circuitry for load responsive devices

Claim 1

IN A LOAD WEIGHING SYSTEM HAVING A LOAD RECEIVING TRANSDUCING ELEMENT GENERATING A VOLTAGE RESPONSIVE AND PROPORTIONAL TO THE APPLICATION OF A LOAD THERETO, A COUNTERBALANCING VOLTAGE CIRCUIT GENERATING A VOLTAGE IN PHASE OPPOSITION TO THAT OF SAID TRANSDUCING ELEMENT AND INCLUDING A POTENTIOMETER HAVING A POSITIONABLE ARM DRIVEN BY A SERVOMOTOR PROVIDING A VOLTAGE TO SAID COUNTERBALANCING CIRCUIT IN ACCORDANCE WITH THE SETTING OF THE ARM, AND A MULTITAPPED SYSTEM CAPACITY CHANGING RESISTOR HAVING A TAP SELECTING SLIDER DRIVEB BY A SECOND MOTOR PROVIDING ANY OF A PLURALITY OF MAGNITUDES OF VOLTAGES TO SAID COUNTERBALANCING CIRCUIT IN ACCORDANCE WITH THE TAP SETTING OF THE SLIDER, AN ERROR DETECTING AMPLIFIER OPERATIVELY CONNECTED IN CIRCUIT WITH SAID TRANSDUCING ELEMENT AND SAID COUNTERBALANCING CIRCUIT AND OPERABLE TO DRIVE SAID SERVOMOTOR IN EITHER OF TWO DIRECTIONS IN RESPONSE TO THE PHASE OF THE DETECTED ERROR SIGNAL, AND A PHASE SENSITIVE CONTROL CIRCUIT FOR SAID SECOND MOTOR COMPRISING, POTENTIOMETER TERMINAL INDICATING MEANS OPERABLE IN RESPONSE TO SAID POTENTIOMETER ARM APPROACHING THE TERMINAL POSITIONS OF SAID POTENTIOMETER, ACTIVATING MEANS FOR SAID SECOND MOTOR RESPONSIVE TO SAID TERMINAL INDICATING MEANS INDICATING THAT SAID POTENTIOMETER ARM IS APPROACHING A TERMINAL THEREOF TO CHANGE THE TAP SETTING OF SAID MULTITAPPED RESISTOR AND THEREBY PROVIDE THE APPROPRIATE COUNTERBALANCING VOLTAGE TO OPPOSE SAID VOLTAGE FROM SAID TRANSDUCING ELEMENT, SAID ERROR DETECTING AMPLIFIER GENERATING AN ERROR SIGNAL OF A GIVEN PHASE IN RESPONSE TO SAID COUNTERBALANCING VOLTAGE CIRCUIT PROVIDING A SIGNAL OF IMPROPER BALANCING RANGE RELATIVE TO SAID TRANSDUCING ELEMENT VOLTAGE AND GENERATING AN ERROR SIGNAL OF AN OPPOSITE PHASE UPON SAID VOLTAGE PROVIDED BY SAID COUNTERBALANCING CIRCUIT BEING WITHIN A PROPER BALANCEABLE RANGE, PHASE SENSITIVE MEANS PREVENTING FURTHER CHANGES IN THE TAP SETTING OF SAID MULTITAPPED RESISTOR UPON SENSING A CHANGE IN PHASE OF SAID ERROR SIGNAL, AND LOAD INDICATING MEANS INDICATING THE MAGNITUDE OF THE APPLIED LOAD.