Rotary seal

Claim 1

IN COMBINATION WITH A TRACK ROLLER ASSEMBLY JOURNALLED FOR ROTATION ABOUT A FIXED ROLLER SHAFT, SAID ASSEMBLY COMPRISING TWO BEARINGS DISPOSED AT AXIALLY SPACED LOCATIONS ON SAID SHAFT, A FLUID SEAL DISPOSED ADJACENT EACH BEARING COMPRISING A FIRST ANNULAR SEALING RING, A SECOND ANNULAR SEALING RING, SAID SEALING RINGS BEING CONCENTRICALLY DISPOSED ABOUT SAID SHAFT, ONE SIDE OF EACH SEALING RING HAVING FORMED THEREIN AN ANNULAR SEALING SURFACE, SAID SEALING SURFACE BEING DISPOSED IN JUXTAPOSED SEALING ENGAGEMENT, AN ANNULAR RECESS OF RECTANGULAR CROSS SECTION FORMED ON THE OTHER SIDE OF EACH SEALING RING, AN ANNULAR SHOULDER FORMED ON SAID SHAFT ADJACENT ONE SEALING RING, A RESILIENT MEANS DISPOSED IN THE ANNULAR RECESS OF SAID ONE SEALING RING AND ENGAGEABLE WITH SAID SHOULDER, AN ADAPTOR CARRIED BY SAID ROLLER INCLUDING A PORTION EXTENDING RADIALLY INWARD ADJACENT THE OTHER SEALING RING, AND A SECOND RESILIENT MEANS SITUATED IN THE ANNULAR RECESS FOR SAID OTHER SEALING RING AND ENGAGEABLE WITH SAID RADIALLY INWARD PORTION, SAID RESILIENT MEANS URGING SAID SEALING RING TOGETHER INTO RELATIVE SEALING RELATIONSHIP WHEREBY LUBRICANT IS RETAINED WITHIN SAID ROLLER, THE ANNULAR SEALING SURFACE FOR EACH SEALING RING BEING SITUATED AT THE RADIALLY INWARD EXTREMITY THEREOF, SAID SHAFT AND SAID FLUID SEALS FORMING A PART OF SAID ROLLER ASSEMBLY AND DEFINING THEREWITH A COMPOSITE, SELF-CONTAINED UNIT.