Multiple speed transmission

Claim 1

IN A POWER TRANSMISSION MECHANISM A HYDROKINETIC UNIT COMPRISING A BLADED TURBINE AND A BLADED IMPELLER DISPOSED IN TOROIDAL FLUID FLOW RELATIONSHIP, A POWER INPUT MEMBER CONNECTED TO SAID IMPELLER, A PLANETARY GEAR UNIT COMPRISING TWO SIMPLE PLANETARY GEAR SETS, EACH SET COMPRISING A SUN GEAR, A RING GEAR, PLANET GEARS ENGAGEABLE WITH SAID SUN AND RING GEARS AND A CARRIER ROTATABLY SUPPORTING SAID PLANET GEARS, THE SUN GEARS OF EACH SET BEING CONNECTED TOGETHER, A DRIVEN MEMBER, THE CARRIER OF THE FIRST GEAR SET BEING CONNECTED TO SAID DRIVEN MEMBER, THE RING GEAR OF THE SECOND GEAR SET BEING CONNECTED TO SAID DRIVEN MEMBER, MEANS FOR INHIBITING ROTATION OF THE CARRIER OF THE SECOND GEAR SET AGAINST ROTATION IN ONE DIRECTION THEREBY ACCOMMODATING DRIVING TORQUE REACTION DURING OPERATION OF SAID GEAR UNIT IN THE LOWEST SPEED RATIO, BRAKE MEANS FOR SELECTIVELY BRAKING THE COMMON SUN GEARS OF SAID GEAR SETS DURING OPERATION OF SAID GEAR UNIT IN AN INTERMEDIATE SPEED RATIO, FIRST CLUTCH MEANS FOR CONNECTING SELECTIVELY SAID TURBINE TO THE RING GEAR OF SAID FIRST GEAR SET, SECOND CLUTCH MEANS ENGAGEABLE SIMULTANEOUSLY WITH SAID FIRST CLUTCH MEANS TO ESTABLISH A DIRECT DRIVE RATIO IN SAID GEAR UNIT, A FLUID PRESSURE SOURCE, FLUID PRESSURE OPERATED SERVOS FOR ACTUATING EACH CLUTCH MEANS AND SAID BRAKE MEANS, CONDUIT STRUCTURE INCLUDING FLUID PRESSURE DISTRIBUTOR VALVE MEANS FOR SELECTIVELY DISTRIBUTING PRESSURE FROM SAID SOURCE TO SAID SERVOS, A SOURCE OF A FIRST FLUID PRESSURE SIGNAL THAT IS PROPORTIONAL APPROXIMATELY IN MAGNITUDE TO DRIVING TORQUE, A SECOND PRESSURE SIGNAL THAT IS PROPORTIONAL SUBSTANTIALLY IN MAGNITUDE TO THE DRIVEN SPEED OF SAID DRIVEN MEMBER, SAID DISTRIBUTOR VALVE MEANS BEING SENSITIVE TO EACH SIGNAL TO CONTROL DISTRIBUTION OF PRESSURE SELECTIVELY TO SAID SERVOS, AND VALVE MEANS DISPOSED IN AND PARTLY DEFINING SAID CONDUIT STRUCTURE FOR MODIFYING THE EFFECTIVE PRESSURE MADE AVAILABLE BY SAID SOURCE TO SAID SECOND CLUTCH MEANS AND SAID BRAKE MEANS IN RESPONSE TO VARIATIONS IN SAID FIRST SIGNAL DURING A SPEED RATIO CHANGE FROM AN INTERMEDIATE SPEED RATIO TO A DIRECT DRIVE RATIO, SAID LAST-NAMED VALVE MEANS BEING IN FLUID COMMUNICATION WITH SAID FIRST FLUID PRESSURE SIGNAL SOURCE AND WITH THE SERVO FOR SAID SECOND CLUTCH MEANS AND BEING RESPONSIVE TO A PRESSURE BUILD-UP IN SAID LASTNAMED SERVO TO EFFECT SUCH MODIFICATION WHEN SAID FIRST PRESSURE SIGNAL IS REDUCED.