Sealing structure for pipe joints

Claim 1

IN A PIPE JOINT BETWEEN THE BELL OF ONE PIPE SECTION AND THE COLLARED SPIGOT OF AN ADJOINING PIPE SECTION, AN ANNULAR LINING SECURED WITHIN THE BELL OF SAID ONE PIPE SECTION FOR RECEIVING THE COLLARED SPIGOT OF SAID ADJOINING PIPE SECTION, SAID LINING COMPRISING A GASKET OF ELASTOMERIC MATERIAL HAVING A PLURALITY OF ANNULAR RESILIENTLY YIELDABLE RIBS EXTENDING RADIALLY INWARDLY THEREOF TO ENGAGE SAID COLLARED SPIGOT END, EACH OF SAID RIBS HAVING A FIRST SIDE INCLINED AWAY FROM THE ENTRANCE TO SAID BELL AT AN ANGLE ON THE ORDER OF ABOUT 40* TO 50* TO THE AXIS OF SAID PIPE AND AN OPPOSITE SECOND SIDE DISPOSED AT AN ANGLE ON THE ORDER OF ABOUT 85* TO 95* TO SAID AXIS, AND AN ANCHORING RING OF MOLDABLE SETTABLE MATERIAL HAVING A HARDNESS AND RIGIDITY GREATER THAN THAT OF SAID GASKET SURROUNDING AND INTERLOCKED WITH SAID GASKET AND HOLDING SAID GASKET IN SAID BELL CONCENTRIC WITH SAID AXIS AND SPACED FROM THE WALL OF SAID BELL, THE OUTER SURFACE OF THE COLLARED SPIGOT INSERTABLE IN SAID GASKET PROVIDING A REFERENCE SUBSTANTIALLY CYLINDRICAL SHAPE CONCENTRIC WITH SAID AXIS, THE SAID GASKET HAVING A PLURALITY OF GROOVES EACH ADJACENT A SAID RIB A SIDE OF EACH SAID GROOVE BEING SUBSTANTIALLY IN THE PLANE OF A SAID FIRST SIDE OF AN ADJACENT RIB, SAID RIBS AND GROOVES HAVING CROSS-SECTIONAL AREAS ON OPPOSITE RADIALLY DIRECTED SIDES OF SAID REFERENCE CYLINDRICAL SHAPE SO PROPORTIONED THAT EACH RIB SUBSTANTIALLY FILLS AN ADJACENT GROOVE ON SAID FIRST SIDE OF THE RIB UPON SAID RIBS BEING FLEXED AWAY FROM THE ENTRANCE OF SAID BELL BY A SAID COLLARED SPIGOT INSERTED IN SAID BELL, THE SAID FLEXED RIBS IN SAID GROOVES FLOWING CIRCUMFERENTIALLY IN THE RESPECTIVE GROOVES FROM THE SIDE OF THE JOINT BEARING THE MAXIMUM RADIAL LOAD TOWARD THE SIDE OF THE JOINT BEARING MINIMUM RADIAL LOAD, SAID ANCHORING RING HAVING AN OUTER END PORTION ADJACENT THE ENTRANCE OF SAID BELL AND AN INNER END PORTION ADJACENT THE BOTTOM OF THE BELL, SAID OUTER END PORTION AND INNER END PORTION HAVING INNER BORES SUBSTANTIALLY UNIFORMLY SPACED FROM SAID REFERENCE CYLINDRICAL SHAPE, THE WALLS OF SAID BORES PROVIDING BEARING SURFACES ENGAGEABLE BY SAID COLLARED SPIGOT UPON TILTING OF THE SAME RELATIVE TO THE AXIS OF SAID BELL.