Proportional speed floating controller

Claim 1

A PROPORTIONAL SPEED FLOATING CONTROLLER COMPRISING (A) A FINAL CONTROL MEMBER MOVABLE IN OPPOSITE DIRECTIONS TO VARY A CONDITION IN REVERSE SENSES; (B) OPERATING MEANS CAPABLE OF BEING ENERGIZED IN OPPOSITE SENSES FOR MOVING THE FINAL CONTROL MEMBER IN SAID OPPOSITE DIRECTIONS; (C) CONTROLLING MEANS, HAVING A MEMBER MOVABLE IN OPPOSITE DIRECTIONS FROM A NEUTRAL POSITION, FOR ENERGIZING THE OPERATING MEANS IN SAID OPPOSITE SENSES, THE RATE AT WHICH THE OPERATING MEANS MOVES THE FINAL CONTROL MEMBER BEING DEPENDENT UPON THE DISTANCE THE MOVABLE MEMBER OF THE CONTROLLING MEANS IS SHIFTED FROM ITS NEUTRAL POSITION; (D) AN ERROR-DETECTING CIRCUIT; (E) MEANS IN SAID CIRCUIT FOR ESTABLISHING A REFERENCE VOLTAGE; (F) MEANS IN SAID CIRCUIT AND RESPONSIVE TO SAID CONDITION FOR ESTABLISHING A SECOND VOLTAGE PROPORTIONAL TO THE MAGNITUDE OF THE CONDITION; (G) MEANS IN SAID CIRCUIT AND RESPONSIVE TO MOVEMENT OF THE MOVABLE MEMBER OF THE CONTROLLING MEANS FOR ESTABLISHING A THIRD VOLTAGE VARIABLE IN MAGNITUDE WITH THE POSITION OF SAID MOVABLE MEMBER AND IN POLARITY WITH THE DIRECTION IN WHICH THAT MEMBER MOVES FROM SAID NEUTRAL POSITION; (H) MEANS ASSOCIATED WITH SAID LAST MENTIONED MEANS FOR VARYING THE RATE OF CHANGE OF MAGNITUDE OF THE THIRD VOLTAGE IN RESPONSE TO MOVEMENT OF THE MOVABLE MEMBER OF THE CONTROLLING MEANS; (I) A REVERSIBLE ELECTRIC MOTOR CONNECTED TO DRIVE THE MOVABLE MEMBER OF THE CONTROLLING MEANS; (J) A MOTOR ACTUATING CIRCUIT CONNECTED WITH THE MOTOR AND INCLUDING SWITCHING MEANS HAVING ONE CONDITION IN WHICH IT CAUSES THE MOTOR TO MOVE IN ONE DIRECTION, AND ANOTHER CONDITION IN WHICH IT CAUSES THE MOTOR TO MOVE IN TTHE OPPOSITE DIRECTION; AND (K) ERROR DETECTING MEANS IN SAID EROR DETECTING CIRCUIT AND CONNECTED WITH SAID SWITCHING MEANS, THE ERROR-DETECTING MEANS BEING RESPONSIVE TO THE DIFFERENCE BETWEEN THE REFERENCE VOLTAGE AND THE ALGEBRAIC SUM OF THE SECOND AND THIRD VOLTAGES FOR CAUSING THE SWITCHING MEANS TO ASSUME THAT CONDITION WHICH WILL ELIMINATE SAID DIFFERENCE.