End face seal assembly with installation retention means

Claim 1

IN AN END FACE SEAL ASSEMBLY ADAPTED FOR OPERATIVE MOUNTING BETWEEN RELATIVELY ROTATABLE PARTS, SAID SEAL ASSEMBLY COMPRISING A SEALING RING HAVING A SEALING SURFACE ALONG AN END FACE THEREOF, AND A SECONDARY SEALING MEMBER OF SOLID BLOCK-LIKE GENERALLY PARALLELOGRAM CROSSSECTIONAL CONFIGURATION FORMED FROM DISTORTIVELY COMPRESSIBLE ELASTOMERIC MATERIAL FOR OPERATIVE FORCE LOADING OF SAID SEALING RING AND HAVING OPPOSITE GENERALLY AXIALLY EXTENDING SURFACES DEFINING END PORTIONS THEREOF, ONE END PORTION OF SAID SECONDARY SEALING MEMBER BEING IN FRICTIONALLY RETAINING ENGAGEMENT WITH SAID SEALING RING IN A SEAT FORMED IN SAID SEALING RING REARWARDLY OF THE SEALING SURFACE THEREOF, SAID SECONDARY SEALING MEMBER EXTENDING AXIALLY REARWARDLY FROM SAID SEALING RING AND PROJECTING RADIALLY RELATIVE TO SAID SEALING SURFACE, SAID SECONDARY SEALING MEMBER CONSTITUTING THE SOLE SUPPORT FOR SAID SEALING RING DURING MOUNTING OF SAID SEAL ASSEMBLY ON A PART, THE OPPOSITE END PORTION OF SAID SECONDARY SEALING MEMBER BEING ADAPTED FOR END SURFACE SEALING ENGAGEMENT WITH DIVERGENT SURFACE PORTIONS INCLUDING AN AXIALLY DIRECTED SURFACE PORTION OF A PART UPON OPERATIVE MOUNTING OF SAID SEAL ASSEMBLY, THE IMPROVEMENT COMPRISING AT LEAST SAID OPPOSITE END PORTION OF SAID SECONDARY SEALING MEMBER HAVING FORMED ALONG THE AXIALLY EXTENDING SURFACE THEREOF A RADIALLY DIRECTED LIP-LIKE PROJECTION ADAPTED FOR FRICTIONAL ENGAGEMENT WITH SAID AXIALLY DIRECTED SURFACE PORTION OF SAID PART TO HOLD SAID SEAL ASSEMBLY IN ITS ENTIRETY AGAINST DISPLACEMENT RELATIVE TO SAID PART DURING INSTALLATION OF SAID SEAL ASSEMBLY AND AT LEAST PRIOR TO FINAL INSTALLATIONAL FORCE LOADING THEREOF.