Method of connecting thermoplastic pipe sections and the like

Claim 1

A METHOD OF FORMING A JOINT BETWEEN TWO ELONGATED TUBULAR PIPE SECTIONS OF UNIFORM WALL THICKNESS MADE OF RIGID BUT ELASTICALLY DEFORMABLE SYNTHETIC RESIN, ONE OF SAID SECTIONS HAVING AN INNER DIAMETER SLIGHTLY SMALLER THAN THE OUTER DIAMETER OF THE OTHER FO SAID SECTIONS, WHICH COMPRISES THE STEPS OF PERMANENTLY DEFORMING EACH OF SAID SECTIONS AT A LOCATION CLOSE TO BUT SPACED FROM ONE OF ITS ENDS WITH AN OUTWARDLY CONVEX TRANSVERSE ANNULAR CORRUGATION OF THE SAME WALL THICKNESS AS THE REMAINDER OF THE SECTION, ALIGNING SAID SECTIONS WITH THE SAID ENDS THEREOF IN CONFRONTING RELATIONSHIP, AND DRIVING SAID OTHER OF SAID SECTIONS BY REPEATED AXIAL BLOWS INTO SAID ONE OF SAID SECTIONS UNTIL THE CORRUGATIONS THEREOF INTERENGAGE AND SAID SECTIONS ARE IN FRICTIONAL CONTACT UNDER RADIAL COMPRESSION OVER AN AXIAL EXTENT AT LEAST EQUAL TO THAT OF THE CORRUGATION.

Claim 2

A METHOD OF FORMING A JOINT BETWEEN TWO ELONGATED TUBULAR PIPE SECTIONS OF UNIFORM WALL THICKNESS MADE OF RIGID BUT ELASTICALLY DEFORMABLE SYNTHETIC RESIN, ONE OF SAID SECTIONS HAVING AN INNER DIAMETER SLIGHTLY SMALLER THAN THE OUTER DIAMETER OF THE OTHER FO SAID SECTIONS, WHICH COMPRISES THE STEPS OF PERMANENTLY DEFORMING EACH OF SAID SECTIONS AT A LOCATION CLOSE TO BUT SPACED FROM ONE OF ITS ENDS WITH AN OUTWARDLY CONVEX TRANSVERSE ANNULAR CORRUGATION OF THE SAME WALL THICKNESS AS THE REMAINDER OF THE SECTION, ALIGNING SAID SECTIONS WITH THE SAID ENDS THEREOF IN CONFRONTING RELATIONSHIP, AND DRIVING SAID OTHER OF SAID SECTIONS BY REPEATED AXIAL BLOWS INTO SAID ONE OF SAID SECTIONS UNTIL THE CORRUGATIONS THEREOF INTERENGAGE AND SAID SECTIONS ARE IN FRICTIONAL CONTACT UNDER RADIAL COMPRESSION OVER AN AXIAL EXTENT AT LEAST EQUAL TO THAT OF THE CORRUGATION.