Automatically controlled mixer discharge system

Claim 1

IN COMBINATION, A MIXER FOR CONDITIONING BULK MATERIAL AND THE LIKE COMPRISING A MIXING CHAMBER HAVING A DISCHARGE OPENING, A MIXING HEAD IN SAID CHANBER FOR MIXING SAID MATERIAL, MOTOR MEANS FOR DRIVING SAID MIXING HEAD, A DISCHARGE DOOR OPERATIVELY ASSOCIATED WITH SAID OPENING FOR REGULATING THE DISCHARGE OF MATERIAL FROM SAID CHAMBER, SAID DOOR BEING MOVABLE IN ONE DIRECTION TOWARD SAID DISCHARGE OPENING TOWARD A CLOSED POSITION AND IN AN OPPOSITE DIRECTION THROUGH AN INTERMEDIATE RANGE TOWARD AN OPEN POSITION, FLUID ACTUATED OPERATOR MEANS FOR MOVING SAID DOOR IN OPPOSITE DIRECTIONS, FLUID CONDUIT MEANS FOR SUPPLYING FLUID TO OPPOSITE ENDS OF SAID OPERATOR MEANS, FIRST AND SECOND VALVE MEANS IN SAID CONDUIT MEANS FOR DIRECTING THE FLOW OF FLUID TOWARD AND AWAY FROM RESPECTIVE OPPOSITE ENDS OF SAID OPERATOR MEANS FOR OPENING AND CLOSING SAID DOOR, CONTROL MEANS INCLUDING MEANS FOR MEASURING THE POWER OF SAID MOTOR MEANS INTERCONNECTED WITH SAID FIRST AND SECOND VALVE MEANS WHEREBY SAID FIRST VALVE MEANS IS ACTUATED FOR CLOSING THE DOOR IN RESPONSE TO A SELECTED LOW POWER LEVEL AND SAID SECOND VALVE MEANS IS ACTUATED FOR OPENING SAID DOOR IN RESPONSE TO A SELECTED HIGH POWER LEVEL, AND THROTTLE VALVE MEANS IN SAID CONDUIT MEANS FOR SELECTIVELY ADJUSTING THE FLOW RATE OF FLUID TOWARD AND AWAY FROM THE RESPECTIVE OPPOSITE ENDS OF SAID OPERATOR MEANS WHEREBY THE RATE OF OPENING AND CLOSING OF SAID DOOR IS SELECTIVELY CONTROLLED.