Variable displacement piston pump

Claim 1

A VARIABLE DISPLACEMENT PISTON PUMP COMPRISING A DRIVE SHAFT HAVING AN AXIAL RECESS AT ONE END, A TILT BOX JOURNALED ON AN AXIS EXTENDING AT RIGHT ANGLES TO THE AXIS OF THE DRIVE SHAFT, A DRIVING FLANGE LOCATED ADJACENT SAID SHAFT END AND ROTATABLY MOUNTED ON SAID TILT BOX FOR ROTATION ABOUT AN AXIS AT RIGHT ANGLES TO SAID JOURNAL AXIS, AND A DRIVING CONNECTION BETWEEN SAID DRIVE SHAFT AND SAID DRIVING FLANGE INCLUDING A CONNECTING SHAFT EXTENDING BETWEEN SAID DRIVE SHAFT AND SAID DRIVING FLANGE AND A UNIVERSAL JOINT CONNECTING SAID DRIVE SHAFT AND SAID CONNECTING SHAFT, SAID JOURNAL AXIS FOR SAID TILT BOX BEING LOCATED AT A POSITION SPACED FROM SAID UNIVERSAL JOINT SO THAT UPON ROTATION OF SAID TILT BOX AND SAID DRIVING FLANGE ABOUT SAID TILT BOX JOURNAL AXIS SAID CONNECTING SHAFT MOVES AXIALLY WITH RESPECT TO SAID DRIVE SHAFT, SAID UNIVERSAL JOINT INCLUDING A PLURALITY OF AXIALLY EXTENDING RIBS FORMED ON THE INTERIOR OF SAID SHAFT RECESS AND HAVING THEIR CRESTS DISPOSED ON A CYLINDRICAL SURFACE CONCENTRICL WITH THE DRIVE SHAFT AXIS, AN INNER MEMBER FIXED WITH RESPECT TO SAID CONNECTING SHAFT AND HAVING AN EQUAL NUMBER OF AXIALLY EXTENDING EXTERNAL RIBS HAVING THEIR CRESTS CONVEXLY CURVED IN A DIRECTION AXIALLY OF SAID CONNECTING SHAFT AND DISPOSED IN SUBSTANTIALLY RADIAL ALIGNMENT WITH ADJACENT CREATS ON SAID INTERNAL RIBS, SAID SHAFT RECESS AND SAID INNER MEMBER HAVING RADIALLY ALIGNED MATING GROOVES FORMED THEREIN ON OPPOSITE SIDES OF SAID RIBS, AND DRIVING BALLS LOCATED IN THE SPACES BETWEEN ADJACENT INTERNAL AND EXTERNAL RIBS.