Coupling with rigidly fixed sealing ring

Claim 1

A SEALING COUPLING COMPRISING FIRST AND SECOND ANNULAR PARTS HAVING ANNULAR END SURFACES PRESENTED TOWARD ONE ANOTHER TO BE CONNECTED TOGETHER AND SEALED AGAINST A FLUID UNDER PRESSURE WITHIN SAID PARTS, ONE OF SAID PARTS HAVING AN OUTWARDLY TAPERING SEALING SURFACE ADJACENT THE END SURFACE OF THE PART EXTENDING AT AN ACUTE ANGLE WITH RESPECT TO THE LONGITUDINAL AXIS OF THE PART, THE OTHER OF SAID PARTS HAVING A LONGITUDINALLY EXTENDING ANNULAR SURFACE ADJACENT THE END SURFACE THEREOF, AN ANNULAR SEALING RING OF HARD METAL OR THE LIKE FOR PROVIDING A SEAL BETWEEN THE END SURFACES OF SAID PARTS WHEN THEY ARE DRAWN TOWARD ONE ANOTHER, SAID SEALING RING COMPRISING A RIB PORTION HAVING A SINGLE FLEXIBLE ANNULAR LIP EXTENDING THEREFROM, SAID RIB PORTION INCLUDING A COMPLEMENTARY LONGITUDINALLY EXTENDING ANNULAR SURFACE OF A SIZE NORMALLY SLIGHTLY DIFFERENT THAN THE SIZE OF SAID FIRST MENTIONED LONGITUDINALLY EXTENDING SURFACE, SAID SEALING RING BEING RIGIDLY FIXED ON THE OTHER OF SAID PARTS WITH SAID LONGITUDINALLY EXTENDING SURFACES IN ENGAGEMENT AND ONE SIDE OF SAID RIB PORTION IN ENGAGEMENT WITH THE ADJACENT END SURFACE OF SAID OTHER PART, SAID LIP HAVING HAVING AN EXTERIOR SEALING SURFACE TAPERING OUTWARDLY ARRANGED TO ENGAGE AND BE DEFLECTED BY AND TO SEAL WITH THE SEALING SURFACE OF SAID ONE PART WHEN THE END SURFACES OF SAID PARTS ARE DRAWN TOWARD ONE ANOTHER, THE OPPOSITE SIDE OF SAID RIB PORTION BEING ENGAGEABLE WITH END SURFACE OF SAID ONE PART IN RESPONSE TO THE MOVEMENT OF THE END SURFACES OF SAID PARTS TOWARD ONE ANOTHER TO LIMIT THE DEGREE OF SUCH MOVEMENT, AND MEANS FOR DRAWING THE END SURFACES OF SAID PARTS TOWARD ONE ANOTHER TO SUCH LIMIT TO EFFECT THE SEAL.