Tube coupling

Claim 1

A TUBE COUPLING COMPRISING A PAIR OF COMPLEMENTAL COUPLING PARTS; AND MEANS FOR CLAMPING SAID PARTS TOGETHER IN FLUID-TIGHT CONTACT; ONE COUPLING PART HAVING AN INTEGRAL RADIALLY INWARDLY EXTENDING FLEXIBLE LIP; AND THE OTHER COUPLING PART HAVING A CAM SURFACE MEANS ENGAGEABLE WITH THE INNER END OF SAID LIP AND EFFECTIVE, UPON CLAMPING TOGETHER OF SAID PARTS, TO AXIALLY FLEX THE INNER END OF SAID LIP TO ESTABLISH A FLUID-TIGHT SEAL AT THE ZONE OF CONTACT OF SAID CAM SURFACE MEANS WITH SAID LIP; SAID CAM SURFACE MEANS BEING TAPERED TO IMPOSE AXIAL AND RADIALLY OUTWARD FORCES ON THE INNER END OF SAID LIP; SAID ONE COUPLING PART ALSO HAVING A TAPERED SEAT AT A ZONE AXIALLY SPACED FROM SAID LIP AND RADIALLY INWARD THEREOF; SAID OTHER COUPLING PART HAVING AN AXIALLY EXTENDING FLEXIBLE LIP EXTENDING THROUGH SAID RADIAL LIP AND EFFECTIVE, UPON CLAMPING TOGETHER OF SAID PARTS, TO ENGAGE SAID TAPERED SEAT AND THEREBY FLEX RADIALLY INWARDLY TO ESTABLISH ANOTHER FLUID-TIGHT SEAL AT THE ZONE OF CONTACT OF SAID TAPERED SEAT WITH SAID AXIAL LIP; THE TAPER OF SAID SEAT BEING SUFFICIENT TO IMPOSE AXIAL AND RADIALLY INWARD FORCES ON SAID AXIALLY EXTENDING LIP; BOTH OF SAID COUPLING PARTS HAVING STRAIGHT, PARALLEL END FACE MEANS OPERATIVE TO ENGAGE EACH OTHER WHEN BOTH SUCH FLUID-TIGHT SEALS ARE ESTABLISHED TO PRECLUDE FURTHER CLAMPING OF SAID COUPLING PARTS TOGETHER AND THUS PRECLUDE OVER-STRESSING OF SAID FLEXIBLE LIPS.