Hydromechanical change-speed and reversing transmission

Claim 1

A CHANGE-SPEED AND REVERSING TRANSMISSION COMPRISING: A DRIVING MEMBER, A GROUP OF INDIVIDUALLY OPERABLE FOTTINGER CIRCUITS INCLUDING A FIRST HYDRODYNAMIC DEVICE FORMING A FLUID TORQUE CONVERTER CAPABLE OF SUBSTANTIALLY INCREASING TORQUE, AND AT LEAST ONE SECOND HYDRODYNAMIC DEVICE, EACH OF SAID HUDRORYNAMIC DEVICES HAVING INPUT MEANS AND OUTPUT MEANS, SAID INPUT MEANS BEING INTERCONNECTED AND OPERATIVELY CONNECTED TO SAID DRIVING MEMBER FOR DRIVE THEREBY, A SPEED-CHANGING GEAR HAVING AN INPUT GEAR AND AN OUTPUT GEAR. SAID INPUT GEAR BEING CONNECTED TO SAID OUTPUT MEANS OF SAID HYDRODYNAMIC DEVICES FOR DRIVE THEREBY. SAID HYDRORYNAMIC DEVICES BEING INDIVIDUALLY OPERABLE FOR SELECTIVELY DRIVING SAID INPUT GEAR OF SAID SPEEDCHANGING GEAR EITHER BY THE FIRST HYDRODYNAMIC DEVICE AT A RELATIVELY LOW SPEED RANGE OR BY THE SECOND HYDRODYNAMIC DEVICE AT A RELATIVELY HIGH SPEED RANGE. A REVERSING GEAR HAVING TWO INPUT GEARS AND AN OUTPUT GEAR. MEANS FOR SELECTIVELY OPERATIVELY CONNECTING SAID INPUT GEAR OR SAID OUTPUT GEAR OF SAID SPEED-CHANGING GEAR TO A SELECTED ONE OF SAID INPUT GEARS OF SAID REVERSING GEAR FOR DRIVING EITHER ONE OR THE OTHER OF SAID INPUT GEARS OF SAID REVERSING GEAR BY EITHER THE INPUT OR THE OUTPUT GEAR OF SAID SPEED-CHANGING GEAR FOR DRIVING SAID OUTPUT GEAR OF SAID REVERSING GEAR AT A SELECTED DIRECTION OF ROTATION AND AT A SELECTED SPEED WITHIN THE SPEED RANGE DEFINED BY THE HYDRODYNAMIC DEVICE WHICH IS IN OPERATION.