Pivot seal construction

Claim 1

IN A LARGE DIAMETER FLUID SEAL, THE COMBINATION COMPRISING FIRST AND SECOND PAIRS OF INNER AND OUTER ANNULAR MEMBERS ADJOINING ONE ANOTHER, EACH OF THE MEMBERS OF A GIVEN PAIR AXIALLY AND RADIALLY SPACED FROM ONE ANOTHER AND HAVING GROOVES FORMED THEREIN, SAID GROOVES BEING SO ORIENTED AS TO BE FACING ONE ANOTHER ALONG A CONICAL LOCUS, FIRST AND SECOND RESILIENT SEALING RINGS INTERPOSED BETWEEN THE RESPECTIVE PAIRS OF ANNULAR MEMBERS, EACH SAID SEALING RING BEING OF GENERALLY SQUARE CROSS SECTION WITH ROUNDED CORNERS AND SCALLOPED SIDES TO DEFINE LOBES, EACH SAID SEALING RING HAVING DIAGONALLY OPPOSITE LOBES, DISPOSED ON THE CONICAL LOCUS OF AND IN SEALING ENGAGEMENT WITH THE RESPECTIVE PAIR OF ANNULAR MEMBERS, THE ADJACENT INNER ONES OF THE ANNULAR MEMBERS BEING IN BEARING CONTACT WITH ONE ANOTHER FOR RELATIVE ROTATION, SAID GROOVES BEING OF SMOOTHLY CONCAVE SECTION THEREBY TO PERMIT BODILY ROCKING MOVEMENT OF THE ENGAGED LOBES OF EACH SEALING RING WITH RESPECT TO THE GROOVES AS THE INNER AND OUTER ANNULAR MEMBERS ARE MOVED AXIALLY TOWARD ONE ANOTHER INTO RUNNING POSITION, AND MEANS FOR HOLDING THE OUTER ONES OF THE ANNULAR MEMBERS ADVANCED INWARDLY TOWARD ONE ANOTHER SO THAT THE SEALING RINGS ARE DEFORMED INTO GENERALLY DIAMOND-SHAPED CROSS SECTION FOR THE DEVELOPMENT OF HIGH SEALING AND BEARING FORCES OVER THE REGIONS OF ENGAGEMENT.