Improvements in hydraulic transmission systems for winches

Claim 1

A HYDRAULIC TRANSMISSION SYSTEM FOR A WINCH, COMPRISING A SUBSTANTIALLY CONSTANT DELIVERING FLUID PUMP HAVING FIRST AND SECOND PUMP CELLS, A FIRST MANUALLY ADJUSTABLE CONTROL VALVE, A FIRST SUPPLY LINE LEADING FROM SAID FIRST PUMP CELL TO THE FIRST MANUALLY ADJUSTABLE CONTROL VALVE, A MOTOR CIRCUIT, A FEED CONDUIT FROM SAID CONTROL VALVE TO SAID MOTOR CIRCUIT, A DISCHARGE CONDUIT FROM SAID MOTOR CIRCUIT TO THE CONTROL VALVE AND A RETURN LINE FROM SAID CONTROL VALVE BACK TO SAID PUMP CELLS, SAID FIRST SUPPLY LINE COMPRISING A FIRST BRANCH CONDUIT AND A SECOND BRANCH CONDUIT LEADING FROM A COMMON JUNCTION TO INDIVIDUAL PORTS IN SAID CONTROL VALVE, SAID FIRST BRANCH CONDUIT LEADING TO A PORT SELECTIVELY CONNECTED WITH SAID FEED CONDUIT IN HOISTING AND STOP POSITIONS OF THE CONTROL VALVE WHILE THE PORT OF THE SECOND BRANCH CONDUIT IS SELECTIVELY CONNECTED TO SAID RETURN LINE IN VARYING SPEED POSITION AND STOP POSITION OF THE CONTROL VALVE, A CHECK VALVE OPENING FOR FLUID FLOW TOWARDS THE MOTOR CIRCUITS AND SITUATED AT A LOCATION INTERMEDIATE SAID JUNCTION AND SAID PORT OF THE FIRST BRANCH CONDUIT, A SECOND MANUALLY ADJUSTABLE CONTROL VALVE, AND A SECOND SUPPLY LINE LEADING FROM SAID SECOND PUMP CELL TO THE SECOND MANUALLY ADJUSTABLE CONTROL VALVE, SAID SECOND CONTROL VALVE BEING ADJUSTABLE TO A FIRST POSITION IN WHICH THE FLUID FROM SAID SECOND SUPPLY LINE IS CONDUCTED TO SAID FIRST BRANCH CONDUIT AND TO A SECOND POSITION IN WHICH THE FLUID FROM SAID SECOND SUPPLY LINE IS CONDUCTED TO SAID SECOND BRANCH CONDUIT AHEAD OF SAID CHECK VALVE.