Steering gear for motor vehicles

Claim 1

IN A STEERING GEAR FOR MOTOR VEHICLES, A LIQUID TIGHT CASING, A STEERING SHAFT EXTENDING INTO SAID CASING AT ONE END THEREOF, A CRANK ARM ON SAID STEERING SHAFT WITHIN SAID CASING, SAID CASING INCLUDING A CYLINDRICAL PORTION EXTENDING FROM SAID ONE END, A PISTON SLIDABLY MOUNTED IN SAID CYLINDRICAL PORTION, A CONNECTING ROD CONNECTING SAID PISTON WITH SAID CRANK ARM WHEREBY MOTION OF SAID PISTON WILL OPERATE ON SAID CRANK ARM TO ROTATE SAID STEERING SHAFT, SCREW THREADED NUT MEANS MOUNTED ON THE SIDE OF SAID PISTON REMOTE FROM SAID CONNECTING ROD, AN ANNULAR VALVE CHAMBER FORMED IN SAID CASING BEYOND AND COAXIAL WITH SAID CYLINDRICAL PORTION, SCREW THREADED MEANS ROTATABLY MOUNTED IN SAID CASING EXTENDING COAXIALLY THROUGH SAID VALVE CHAMBER COOPERATIVELY ENGAGING SAID NUT MEANS, STEERING MEANS TO ROTATE SAID SCREW THREADED MEANS TO SELECTIVELY BIAS SAID PISTON ACCORDING TO THE DIRECTION OF ROTATION OF SAID STEERING MEANS, A SUPPLY CONNECTION TO SAID VALVE CHAMBER FOR PROVISION OF HYDRAULIC FLUID UNDER PRESSURE TO SAID VALVE CHAMBER, TWO PAIRS OF SPACED ANNULAR VALVE SEATS COAXIAL WITH SAID STEERING MEANS, ONE AT EACH AXIAL END OF SAID VALVE CHAMBER, A CONNECTING PASSAGE MEANS FROM THE SPACE BETWEEN ONE SAID PAIR OF ANNULAR VALVE SEATS TO SAID CYLINDRICAL PORTION OF SAID CASING ON ONE SIDE OF SAID PISTON, A CONNECTING PASSAGE MEANS FROM THE SPACE BETWEEN THE OTHER SAID PAIR OF ANNULAR VALVE SEATS TO SAID CYLINDRICAL PORTION OF SAID CASING ON THE OTHER SIDE OF SAID PISTON, DISCHARGE PASSAGE MEANS OUTWARDLY OF EACH OF SAID PAIR OF ANNULAR VALVE SEATS, AND TWO ANNULAR VALVE ELEMENTS POSITIONED ON SAID STEERING MEANS ONE BETWEEN EACH OF SAID PAIRS OF VALVE SEATS SPACED AT A FIXED AXIAL DISTANCE SUCH THAT UPON AXIAL MOVEMENT OF SAID STEERING MEANS UNDER THE INFLUENCE OF SAID SCREW THREADED MEANS ROTATING IN SAID SCREW THREADED NUT MEANS EACH OF SAID VALVE ELEMENTS SEATS ON A VALVE SEAT ONE TO CLOSE OFF THE SPACE BETWEEN ITS TWO VALVE SEATS FROM THE HYDRAULIC FLUID SUPPLY CONNECTION AND THE OTHER TO CLOSE OFF THE SPACE BETWEEN ITS TWO VALVE SEATS FROM ITS DISCHARGE PASSAGE MEANS.