Centralizing valve grooves to secure equal reversibility

Claim 1

IN A POWER STEERING DEVICE FOR VEHICLES, THE COMBINATION WITH A CYLINDER, A PISTON SLIDABLE THEREIN AND HAVING INTERNAL GROOVES, A VALVE SLIDABLE WITHIN THE PISTON AND HAVING COOPERATING EXTERNAL GROOVES, AND A PAIR OF SPACED ANNULAR SPRINGS URGING THE VALVE TO MID-POSITION, THE VALVE HAVING PROXIMATE EACH END THEREOF AN ANNULAR SEAT FOR THE PROXIMATE SPRING; OF MEANS FOR CENTRALIZING AN EXTERNAL GROOVE OF THE VALVE IN RELATION TO INTERNAL GROOVES IN THE PISTON TO INSURE EQUAL REVERSIBILITY: SAID MEANS COMPRISING TWO SPACED MEMBERS EACH ADJUSTABLE AXIALLY WITH RESPECT TO THE PISTON AND EACH HAVING AN ANNULAR SPRING SEAT ENGAGING THE OPPOSITE PORTION OF THE PROXIMATE SPRING, AND MEANS FOR INDEPENDENTLY LOCKING EACH OF SAID MEMBERS IN ITS ADJUSTED POSITION, A RING SLIDABLE IN THE PISTON FORMING ONE OF SAID SPACED MEMBERS, AND AN INTERNALLY SPLINED NUT HAVING THREADED ENGAGEMENT WITH THE PISTON HOLDS THE RING IN CONTACT WITH THE PROXIMATE SPRING AND THUS IS PART OF THE CENTRALIZING MEANS.