Bushing assembly

Claim 1

A RESILIENT PIVOTAL BUSHING ASSEMBLY COMPRISING A PAIR OF BUSHING MEMBERS ARRANGED ONE CONCENTRIC ABOUT THE OTHER, SAID MEMBERS HAVING OPPOSED BEARING SURFACES EXTENDING AXIALLY OF THE BUSHING ASSEMBLY UPON WHICH SURFACES SAID BUSHING MEMBERS ARE ROTATABLE RELATIVE TO EACH OTHER IN SAID CONCENTRIC ARRANGEMENT, THE BEARING SURFACES OF EACH OF SAID MEMBERS BEING IN THE FORM OF A RIB DISPOSED HELICALLY ALONG THE RESPECTIVE BUSHING MEMBERS, THE HELICAL RIB OF ONE BUSHING MEMBER INTERMESHING WITH THE HELICAL RIB OF THE OTHER BUSHING MEMBER, AT LEAST ONE OF SAID RIBS BEING OF RESILIENT RUBBER, AN ANNULAR RESILIENT RUBBER BODY ON ONE END OF ONE BUSHING MEMBER, A BEARING SURFACE FORMED ON SAID RUBBER BODY AND DISPOSED GENERALLY TRANSVERSELY OF THE BUSHING ASSEMBLY AND ROTATABLY ENGAGED WITH A MATING TRANSVERSE BEARING SURFACE ON SAID OTHER BUSHING MEMBER, SAID TRANSVERSE BEARING SURFACES BEING PRESSED AGAINST EACH OTHER IN ROTARY ENGAGEMENT IN RESPONSE TO AXIAL THRUST LOADS ON THE BUSHING ASSEMBLY, AND SEALING MEANS AT THE END OF SAID BUSHING ASSEMBLY OPPOSITE SAID TRANSVERSE BEARING SURFACES, SAID SEALING MEANS INCLUDING AN ANNULAR RIB ON ONE BUSHING MEMBER AND AN ANNULAR CHANNEL IN THE OTHER BUSHING MEMBER WIDER THAN SAID RIB INTO WHICH SAID RIB PROJECTS WHEREBY SAID BUSHING MEMBERS ARE ADAPTED FOR LIMITED UNRESTRICTED RELATIVE ROTATION IN REVERSE DIRECTIONS FROM A NEUTRAL CENTRAL ASSEMBLED POSITION OF SAID INTERMESHED HELICAL RIBS.