Piston for power steering system

Claim 1

IN COMBINATION, A HOUSING HAVING INTERSECTING BORES THEREIN WITH THEIR AXES IN PLANES AT RIGHT ANGLES TO EACH OTHER, A PISTON AND AN OUTPUT SHAFT RESPECTIVELY IN SAID BORES, A PINION ON THE OUTPUT SHAFT, A RACK ON THE PISTON MESHING WITH THE PINION, SAID HOUSING HAVING AN INLET PORT DIAMETRICALLY OPPOSITE THE PINION AND RACK AND LEADING TO A RESTRICTED BORE COAXIAL WITH THE AXIS OF THE INLET PORT, SAID PISTON HAVING THEREIN AN ELONGATED DISTRIBUTING SLOT PARALLEL TO THE AXIS OF THE PISTON AND OF A WIDTH EQUAL TO AND COMMUNICATING WITH SAID RESTRICTED BORE, WHEREBY TO MINIMIZE PRESSURE ON THE PISTON AT THE RACK SIDE, IN WHICH COMBINATION THE PISTON HAS A PASSAGEWAY PARALLEL TO AND COMMUNICATING WITH SAID SLOT, A BALL VALVE SPRING PRESSED TO ITS SEAT AT EACH END OF THE PASSAGEWAY, AND A LONGITUDINAL ADJUSTABLE, SLENDER PLUNGER AT EACH END OF THE HOUSING TO ENGAGE THE PROXIMATE BALL AND TO FORCE IT OFF ITS SEAT AGAINST THE PRESSURE OF ITS SPRING AND THE PRESSURE OF THE FLUID WITHIN THE PASSAGEWAY AS THE PISTON MOVES WITHIN A CHOSEN DISTANCE FROM EITHER END OF THE PISTON BORE IN THE HOUSING.