Anchor and fluid seal for conduit liner

Claim 1

A JOINT FOR LINED PIPE SECTIONS COMPRISING SEPARATE COUPLING MEMBERS SURROUNDING ADJACENT END PORTIONS OF SAID SECTIONS, MEANS CONNECTING SAID SEPARATE COUPLING MEMBERS TO SAID ADJACENT SECTIONS, AN ANNULAR RECESS IN EACH OF SAID COUPLING MEMBERS DEFINED BY OPPOSING RADIALLY INWARDLY AND AXIALLY OUTWARDLY OPENING COAXIAL COUNTERBORES FORMED IN THE OPPOSING END PORTIONS OF EACH OF SAID MEMBERS, MEANS FOR INDEPENDENTLY ADJUSTING SAID COUPLING MEMBERS ON SAID SECTIONS TO THEREBY VARY THE AXIAL SPACING BETWEEN SAID RECESSES BY REGULATING THE DISTANCE BETWEEN SAID SEPARATE COUPLING MEMBERS, RESILIENT SEAL MEANS DISPOSED WITHIN EACH OF SAID COUNTERBORES, THE COMBINED AXIAL EXTENT OF SAID OPPOSING SEAL MEANS BEING GREATER THAN THE SUM OF THE MAXIMUM AXIAL EXTENT OF SAID RECESSES, A THIN-WALLED, FLEXIBLE, NON-METALLIC LINER IN EACH OF SAID SECTIONS, THE ADJACENT END PORTIONS OF SAID LINER EXTENDING BEYOND THE RESPECTIVE ENDS OF SAID SECTIONS TO A POSITION RADIALLY INWARDLY OPPOSED TO SAID SEAL MEANS, A BACKING RING HAVING A GREATER EXTERNAL DIAMETER THAN THE NORMAL INTERNAL DIAMETER OF SAID SEAL MEANS DISPOSED WITHIN THE END PORTION OF SAID LINER AT A POINT RADIALLY OPPOSITE SAID SEAL MEANS AND FORCING SAID LINER INTO FLUID-TIGHT ENGAGEMENT WITH SAID SEAL MEANS, AND MEANS FOR LOCKING SAID COUPLING MEMBERS IN OPPOSED RELATIONSHIP WITH SAID SEAL MEANS IN FLUID-TIGHT AXIAL ABUTMENT.