Pipe coupling of sponge elastomer

Claim 1

A PIPE AND COUPLING ASSEMBLY COMPRISING A HOLLOW, CELLULAR-ELASTOMER COUPLING RING HAVING NORMALLY FRUSTOCONICAL, INNER WALLS TAPERING FROM AN AXIALLY CENTRAL PORTION OF SAID COUPLING RING TO OPPOSITE ENDS THEREOF, SAID CENTRAL PORTION INCLUDING A CELLULAR-ELASTOMER, ANNULAR RIB PROJECTING INTO THE CENTRAL PORTION OF SAID COUPLING RING, A CYLINDRICAL PIPE MOUNTED IN EACH OF SAID OPPOSITE ENDS OF SAID COUPLING WITH THE OUTER WALLS OF SAID PIPES DEFORMING SAID NORMALLY FRUSTO-CONICAL INNER WALLS INTO CYLINDRICAL INNER WALLS, SAID ANNULAR RIB PROJECTING INTO SAID COUPLING RING A DISTANCE NOT SUBSTANTIALLY GREATER THAN THE WALL THICKNESS OF SAID PIPES, SAID CENTRAL PORTION HAVING AN ENCLOSED, ANNULAR CAVITY WITH THE OUTER, RADIAL WALL OF SAID CAVITY LOCATED RADIALLY OUTWARDLY OF THE INNER WALL OF SAID CENTRAL PORTION AND THE INNER, RADIAL WALL LOCATED INSIDE SAID RIB FOR COMPENSATING STRESSES IN SAID COUPLING RING WHEN SAID PIPE ENDS ARE INSERTED IN SAID COUPLING RING, AND A RING CLAMP EXTENDING ABOUT THE OUTER WALL OF SAID CENTRAL PORTION OPPOSITE SAID RIB AND CLAMPING SAID PIPE AND COUPLING ASSEMBLY.