Deformed ring pipe joint

Claim 1

A COMPRESSION FITTING ADAPTED SEALINGLY TO ENGAGE A PIPE HAVING A CLOSED PERIPHERAL SURFACE, SAID FITTING COMPRISING A RING OF RELATIVELY HARD BUT DEFORMABLE MATERIAL SURROUNDING SAID PIPE AND HAVING AN ANNULAR SURFACE JUXTAPOSED WITH THE PERIPHERAL SURFACE OF SAID PIPE AND HAVING A PAIR OF BEVELED END FACES; A PAIR OF THREADEDLY INTERCONNECTED CLAMPING MEMBERS SURROUNDING SAID PIPE AND HAVING RESPECTIVE ANNULAR ABUTMENT FACES ADAPTED TO BEAR AGAINST SAID BEVELED END FACES WHEN SAID MEMBERS ARE THREADEDLY DRAWN TOGETHER, EACH OF SAID ABUTMENT FACES BEING FORMED AS A PAIR OF ANGULARLY ADJOINING FRUSTOCONICAL SURFACES LYING AT DIFFERENT ANGLES WITH RESPECT TO THE LONGITUDINAL AXIS OF SAID PIPE SO AS TO FORM A RESPECTIVE ANNULAR EDGE OF OBTUSELY ANGULAR CROSS-SECTION AT THE JUNCTION BETWEEN THE FRUSTOCONICAL SURFACES OF EACH ABUTMENT FACE, THE FRUSTOCONICAL SURFACES OF EACH ABUTMENT FACE INCLUDING A FIRST CONICAL SURFACE OVERLYING SAID PACKING RING AND LYING AT AN ANGLE WITH RESPECT TO SAID PIPE AXIS LESS THAN THAT OF THE RESPECTIVE BEVELED END FACE AND A SECOND FRUSTOCONICAL SURFACE EXTENDING AXIALLY INWARDLY FROM SAID FIRST FRUSTOCONICAL SURFACE AND LYING A AN ANGLE WITH RESPECT TO SAID PIPE AXIS LARGER THAN THAT OF THE RESPECTIVE BEVELED END FACE, SAID PACKING RING HAVING ITS MAJOR PORTION FORMED OF A SOFTER MATERIAL THAN SAID CLAMPING MEMBERS, SAID PACKING RING BEING FORMED WITH RELATIVELY CLOSELY AXIALLY SPACED ANNULAR INWARDLY DIRECTED CUTTING TEETH ALONG SAID ANNULAR SURFACE FOR PENETRATING SAID PERIPHERAL SURFACE UPON THREADED INTERCONNECTION OF SAID MEMBERS WHEREBY SAID ANNULAR EDGES BITE INTO SAID BEVELED END FACE AS SAID MEMBERS ARE ROTATED RELATIVELY AND FORCE MATERIAL OF SAID PACKING RING BETWEEN SAID FIRST AND SECOND FRUSTOCONICAL SURFACES AND SAID PIPE UNTIL SAID SECOND FRUSTOCONICAL SURFACES ARE BROUGHT IN TO EXTENDED SURFACE CONTACT WITH SAID PACKING RING.