Dead center point controlling device

Claim 1

IN COMBINATION WITH A HYDROSTATIC MOVEMENT CONVERTER COMPRISING A RECIPROCABLE PISTON EQUIPPED DISPLACING DEVICE, AND A ROTARY PISTON EQUIPPED DISPLACING DEVICE, AND ALSO COMPRISING MAIN CONDUIT MEANS ESTABLISHING HYDRAULIC COMMUNICATION BETWEEN SAID ROTARY PISTON EQUIPPED DISPLACING DEVICE AND SAID RECIPROCABLE PISTON EQUIPPED DISPLACING DEVICE, AN ARRANGEMENT FOR CONTROLLING A DESIRED DEAD CENTER POSITION OF THE PISTON OF SAID RECIPROCABLE PISTON EQUIPPED DISPLACING DEVICE, WHICH INCLUDES: A MASTER VALVE HAVING A VALVE BOX WITH A VALVE BORE THEREIN AND ALSO WITH A FEED-IN CONDUIT AND A FEEDOUT CONDUIT COMMUNICATING WITH SAID VALVE BORE AND WITH SAID MAIN CONDUIT AND RESPECTIVELY HAVING INTERPOSED THEREIN A FIRST CHECK VALVE AND A SECOND CHECK VALVE, SAID CHECK VALVES BEING EFFECTIVE IN AN OPPOSITE SENSE WITH REGARD TO EACH OTHER, A PRESSURE ACCUMULATOR, ADDITIONAL CONDUIT MEANS PROVIDED IN SAID VALVE BOX AND COMMUNICATING WITH SAID VALVE BORE AND SAID PRESSURE ACCUMULATOR, A VALVE BODY ADJUSTABLE IN SAID VALVE BORE AND MOVABLE FROM A NEUTRAL POSITION IN WHICH IT INTERRUPTS COMMUNICATION BETWEEN SAID PRESSURE ACCUMULATOR AND BOTH OF SAID FEED-IN AND FEED-OUT CONDUITS INTO A FIRST CONTROL POSI-