Seal between a pair of relatively rotatably, radially extending surfaces

Claim 1

IN A MACHINE HAVING A FIRST MEMBER RELATIVELY ROTATABLY MOUNTED WITH RESPECT TO A SECOND MEMBER TO DEFINE THEREBETWEEN A GAP HAVING AN ELONGATED RALIAL DIMENSION AND A RELATIVLY SHORT AXIAL DIMENSION, SAID GAP BEING BOUNDED BY A GENERALLY RADIALLY EXTENDING ANNULAR SURFACE ON SUCH FIRST MEMBER AND BOTH A GENERALLY RADIALLY EXTENDING ANNULAR SURFACE AND A GENERALLY AXIALLY EXTENDING ANNULAR SURFACE ON THE SECOND: AN ANNULAR SEAL RING HAVING INNER AND OUTER PERIPHERIES AND INTERFERINGLY AND SEALINGLY MOUNTED AT ONE SAID PERIPHERY ON SAID AXIALLY EXTENDING SURFACE IN NONROTATABLE RELATIONSHIP THEREWITH, SAID SEAL RING IN RELAXED POSITION HAVING THE GENERAL FORM OF A FRUSTOCONICAL SHELL WITH AN AXIAL HEIGHT GREATER THAN THE AXIAL DIMENSION OF THE GAP, A THICKNESS LESS THAN SUCH GAP AXIAL DIMENSION, AND A SLANT HEIGHT BETWEEN SAID PERIPHERIES ELONGATED IN COMPARISON WITH BOTH ITS AXIAL HEIGHT AND THICKNESS BUT LESS THAN THE RADIAL DIMENSION OF THE GAP, SAID SEAL RING BEING ELASTICALLY AXIALLY FLATTENABLE TO REDUCE ITS AXIAL HEIGHT SAID SEAL RING HAVING A PAIR OF AXIALLY OPPOSITELY FACING ANNULAR SURFACES ADJACENT ITS INNER AND OUTER PERIPHERAL PORTIONS, ONE OF WHICH SEALINGLY ENGAGES THE PORTION OF THE RADIALLY EXTENDING SURFACE ON THE SECOND MEMBER ADJACENT THE AXIALLY EXTENDING SURFACE THEREOF, AND THE OTHER OF WHICH SEALINGLY AND SLIDINGLY ENGAGES THE RADIALLY EXTENDING SURFACE OF THE FIRST MEMBER, SUCH ANGAGEMENT RESULTING FROM A PARTIAL FLATTENING OF SAID SEAL RING BETWEEN AND BY THE RADIALLY EXTENDING SURFACES OF SUCH MEMBERS, SAID SEAL RING BEING FREE OF ENGAGEMENT WITH SAID MEMBERS EXCEPT FOR SAID INTERFERENCE FIT AND SAID FLATTENING.