Rotatable pipe joint

Claim 1

A PIPE JOINT COMPRISING, A PAIR OF PIPES EACH HAVING MEANS DEFINING A BORE AND A COUNTERBORE, SAID PIPES BEING AXIALLY ALIGNED WITH SAID COUNTERBORES IN OPPOSED RELATION, A CYLINDRICAL SLEEVE, FABRICATED FROM A SYNTHETIC RESIN HAVING COLD FLOW AND LUBRICATING PROPERTIES INSERTED IN EACH OF SAID COUNTERBORES, SAID SLEEVE BEING IN ENGAGEMENT WITH SHOULDERS FORMED BETWEEN SAID BORE AND COUNTERBORE JUNCTIONS, SAID SLEEVE BEING RADIALLY, OUTWARDLY EXPANDED AT SUBSTANTIALLY ITS MIDSECTION TO FORM AT LEAST ONE INTEGRAL RADIALLY OUTWARDLY OUTWARDLY PROJECTING, SYMMETRICAL, ANNULAR BELLOWSLIKE MEMBER, THE OPPOSED RADIAL FACES OF EACH OF THE PIPE WALLS BEING CONTOURED TO ENGAGE SAID BELLOWS MEMBER AT AT LEAST THE POINT OF JUNCTURE OF SAID EXPANDED PORTION AND SAID CLINDRICAL PORTION, SAID COUNTERBORES EXTENDING INWARDLY FROM SAID PIPE TERMINAL ENDS NO FURTHER THAN A DISTANCE APPROXIMATELY EQUAL TO THE DIAMETER OF SAID BORE, BUT TO A DISTANCE GREATER THAN THE AXIAL LENGTH OF THE BELLOWS, AND MEANS TO RETAIN AND DRAW SAID PIPE ENDS TOWARD EACH OTHER AND TO FORCE THE ENDS OF SAID SLEEVE INTO ENGAGEMENT WITH SAID SHOULDERS.