Rotary sealing devices

Claim 1

A SEALING RING ASSEMBLY COMPRISING TWO RELATIVELY MOVABLE MEMBERS OF WHICH ONE IS PROVIDED WITH AN ANNULAR SEAL-RECEIVING RECESS HAVING A CYLINDRICAL ING SURFACE LYING BETWEEN OPPOSITE END SURFACES, AND OF WHICH THE OTHER HAS A CYLINDRICAL SEATING SURFACE SPACED CONCENTRICALLY BY A GIVEN DISTANCE FROM THE CYLINDRICAL BASE SEATING SURFACE, AND A RESILIENT SEALING RING DISPOSED IN THE RECESS WITH AXIAL CLEARANCE BETWEEN THE END SURFACES THEREOF BUT OF A SIZE TO FIT WITH RADIAL COMPRESSION BETWEEN THE CONCENTRICALLY SPACED SEATING SURFACES OF THE TWO MEMBERS, SAID SEALING RING HAVING A CROSS-SECTION WHICH IS SYMMETRICAL ABOUT A PLANE TRANSVERSE TO THE CENTRAL AXIS OF THE RING, AND SAID CROSS-SECTION BEING DEFINED AT LEAST IN PART BY TWO END SURFACES OF THE RING WHICH CONVERGE ON OPPOSITE SIDES OF THE PLANE OF SYMMETRY, AT AN INCLUDED ANGLE WHICH IS SOMEWHAT LESS THAN A RING ANGLE, TO FORM A DYNAMIC SEALING LIP HAVING A NORROW SEALING EDGE LYING SUBSTANTIALLY AT THE INTERSECTION OF SAID END SURFACES, AND BY A THIRD SURFACE WHICH HAS AN ANNULAR GROOVE IN THE PLANE OF SYMMETRY AND WHICH HAS AN ANNULAR SAID CONVERGENT END SURFACES TWO STATIC SEALING LIPS RESPECTIVELY DISPOSED ON OPPOSITE SIDES OF THE GROOVE AGAINST THE