Multiple speed ratio power transmission mechanism and automatic control system

Claim 1

IN A POWER TRANSMISSION MECHANISM FOR DELIVERING POWER FROM A DRIVEN CONTROLLED ENGINE TO A DRIVEN SHAFT, TWO FLUID PRESSURE OPERATED SERVO MEANS FOR CONTROLLING THE RELATIVE MOTION OF TORQUE DELIVERY ELEMENTS OF SAID MECHANISM, A FLUID PRESSURE SOURCE, CONDUIT STRUCTURE INCLUDING SEPARATE PORTIONS EXTENDING FROM SAID SOURCE TO EACH SERVO MEANS, SEPARATE FLUID PRESSURE DISTRIBUTOR VALVE MEANS DISPOSED IN AND PARTLY DEFINING EACH CONDUIT STRUCTURE PORTION, GOVERNOR VALVE MEANS FOR PRODUCTING A FIRST PRESSURE SIGNAL THAT IS PROPORTIONAL IN MAGNITUDE TO DRIVEN SHAFT SPEED, THROTTLE VALVE MEANS FOR PRODUCING A SECOND PRESSURE SIGNAL THAT IS PROPORTIONAL IN MAGNITUDE TO AN ENGINE POWER FACTOR, BRANCH PASSAGE MEANS FOR SUBJECTING MOVABLE PORTIONS OF SAID DISTRIBUTOR VALVE MEANS TO SAID SIGNALS FOR ACTUATING THEM, ONE DISTRIBUTOR VALVE MEANS AND THE OTHER DISTRIBUTOR, VALVE MEANS RESPONDING TO INCREASING DRIVEN SHAFT SPEED FOR ANY GIVEN DRIVER DEMAND FOR ENGINE TORQUE TO CONDITION SAID SERVOS FOR SPEED RATIO SHIFTS FROM A LOW SPEED RATIO TO AN INTERMEDIATE SPEED RATIO AND FROM SAID INTERMEDIATE SPEED RATIO TO A HIGH SPEED RATIO RESPECTIVELY, REGULATOR VALVE MEANS FOR MAINTAINING A PREDETERMINED OPERATING PRESSURE LEVEL FOR SAID SERVOS, SAND ONE DISTRIBUTOR VALVE MEANS BEING IN FLUID COMMUNICATION WITH PORTIONS OF SAID REGULATOR VALVE MEANS AND ADAPTED TO CONTROL DIS-