Seal assembly

Claim 1

A SEALING UNIT TO BE SUPPORTED FOR ENGAGEMENT WITH AN ANNULAR SEALING FACE ON A ROTATING MEMBER COMPRISING IN COMBINATION A CARRIER RING HAVING A BODY PORTION AND A HEAD PORTION WITH A SEALING RING MOUNTED ON THE HEAD PORTION HAVING AN ANNULAR SEALING FACE FOR ENGAGEMENT WITH THE ROTATING SEALING FACE, A CASING RING SURROUNDING THE CARRIER RING, A HOUSING HAVING AN ANNULAR INNER SURFACE SUPPORTINGLY ENGAGING THE CASING RING AND BEING OF UNIFORM DIAMETER AT A TAIL END SPACED FROM A SHOULDER OF THE CARRIER RING FOR AXIALLY REMOVING THE CARRIER RING FROM THE HOUSING, THE SHOULDER ON THE CARRIER RING FORMED BY SAID HEAD PORTION PROJECTING RADIALLY OUTWARDLY FROM THE BODY PORTION, SPRING MEANS BETWEEN THE CASING RING AND SAID SHOULDER, A SLIDING SEAL BETWEEN THE BODY PORTION OF THE CARRIER RING AND THE CASING RING, SAID BODY PORTION OF THE CARRIER RING EXTENDING AXIALLY BEYOND THE CASING RING IN A DIRECTION AWAY FROM SAID SEALING FACES, A HOLDING WASHER SECURED TO SAID TAIL END OF THE HOUSING AND HAVING AN INNER DIAMETER LARGER THAN THE INNER DIAMETER OF THE CASING RING, AND A SNAP RING IN A GROOVE ON THE BODY PORTION OF THE CARRIER RING POSITIONED TO BE ENGAGED BY THE CASING RING WITH EXPANSION OF SAID SPRING MEANS TO LIMIT RELATIVE AXIAL MOVEMENT OF SAID CARRIER AND SAID CASING RINGS AND HAVING AN OUTER DIAMETER GREATER THAN THE INNER DIAMETER OF THE CASING RING BUT LESS THAN THE INNER DIAMETER OF THE WASHER TO SEAT AGAINST THE CASING RING RADIALLY WITHIN SAID WASHER WITH AXIAL MOVEMENT OF THE CARRIER RING.