Hydraulic power steering apparatus

Claim 1

IN HYDRAULIC POWER STEERING APPARATUS INCLUDING A BEARING MEMBER RECIPROCABLY RECEIVING A PISTON ROD HAVING AN ENLARGED RECESS CONCENTRIC WITH SAID ROD, SAID RECESS OPENING INTO ONE END OF SAID BEARING MEMBER AND INCLUDING AN INTERNALLY THREADED PORTION THEREAT, AN ANNULAR, RESILIENT SEAL CIRCUMPOSED ABOUT SAID ROD AND SEATED IN SAID RECESS INWARDLY OF SAID INTERNALLY THREADED PORTION, A BUSHING NUT HAVING AN EXTERNALLY THREADED SHANK REMOVABLY RECEIVED IN SAID INTERNALLY THREADED PORTION AND TERMINALLY ENGAGING SAID RESILIENT SEAL AND EXPANDING IT RADIALLY INWARDLY INTO SEALED ENGAGEMENT ABOUT SAID ROD, SAID BUSHING NUT INCLUDING AN AXIAL BORE INCLUDING A FIRST PORTION HAVING A UNIFORM DIAMETER RECIPROCABLY RECEIVING SAID ROD AND PROVIDING A BEARING FOR SAID ROD AND A SECOND PORTION HAVING A UNIFORM DIAMETER GREATER THAN THAT OF SAID FIRST PORTION IMMEDIATELY ADJACENT SAID FIRST PORTION AND OPENING INTO THE OUTER SURFACE OF SAID BUSHING NUT, AND A SCRAPER ASSEMBLY FRICTIONALLY RETAINED IN SAID SECOND PORTION AND COMPRISING AN ANNULAR RECEPTACLE INCLUDING OPPOSED RADIAL FLANGES HAVING DISPOSED IN CLAMPED RELATION THEREBETWEEN, IN ORDER, A RESILIENT WIPER IMMEDIATELY ADJACENT SAID FIRST PORTION AND INCLUDING A BEVELED WIPING EDGE ENGAGED ABOUT SAID PISTON ROD AND DIRECTED TOWARD THE OUTER SURFACE OF SAID NUT, A FIRST METAL RING, A METAL SCRAPER INCLUDING A RESILIENT, AXIALLY PROJECTING TRUNCATED CONICAL PORTION FRICTIONALLY ENGAGED ABOUT SAID ROD AND TERMINATING BEYOND THE OUTER SURFACE OF SAID NUT FOR SCRAPING THE MAJOR PORTION OF FOREIGN MATTER FROM SAID ROD, AND A SECOND RING ENGAGED BY THE OUTERMOST RADIAL FLANGE OF SAID RECEPTACLE, THE BEVELED WIPING EDGE OF SAID RESILIENT WIPER AND SAID TRUNCATED CONICAL PORTION PREVENTING SUBSTANTIALLY ALL FOREIGN MATTER FROM CONTACTING SAID FIRST PORTION AND SAID RESILIENT SEAL, AND THE RADIAL EXPANSION OF SAID RESILIENT SEAL BEING ADJUSTED BY THE AXIAL ADJUSTMENT OF SAID BUSHING NUT IN THE THREADED PORTION OF SAID BEARING MEMBER RECESS.