Preparation of an end of a thermoplastics tube manufactured...

F - Mech Eng,Light,Heat,Weapons – 16 – L

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Details

F16L 9/18 (2006.01) B29C 53/80 (2006.01) B29C 57/00 (2006.01) F16L 9/16 (2006.01) F16L 47/02 (2006.01)

Patent

CA 2368889

The invention concerns a method for preparing an end of a thermoplastics tube (1) manufactured by spirally winding and welding together of a hollow profile (1a) having a substantially rectangular cross section, and is characterized by the steps as follow: cutting the end of the tube by a planar transversal section; extruding a second hollow profile (2) having a rectangular cross section and an outer shape essentially similar to that of the hollow profile (1a) from which the tube (1) is manufactured; spirally winding the extruded second hollow profile (2) around a drum having a diameter corresponding to inner diameter of the tube (1); cutting a loop (2a) from the second hollow profile (2) in a length corresponding to circumference of the tube end; joining the ends of the loop (2a) to each other, whereby a ring (2b) is achieved having same inner and outer diameters as the spirally wound tube (1); placing the ring (2b) against the cut tube end; and welding the ring (2b) to the tube end.

L'invention concerne un procédé de préparation d'une extrémité d'un tube thermoplastique (1) par enroulement en spirale et soudage d'un profilé creux (1a) présentant une section sensiblement rectangulaire. Ledit procédé consiste principalement à: couper l'extrémité du tube en section transversale plane; extruder un deuxième profilé creux (2) présentant une section rectangulaire et une forme extérieure sensiblement similaire à celle du profilé creux (1a) à partir duquel le tube (19) est fabriqué; enrouler en spirale le second profilé creux extrudé (2) autour d'un tambour possédant un diamètre correspondant au diamètre intérieur du tube (1) ; couper une boucle (2a) dans le deuxième profilé creux (2), à une longueur correspondant à la circonférence de l'extrémité de tube ; joindre les extrémités de la boucle (2a), un anneau (2b) présentant les mêmes diamètres intérieur et extérieur que ceux du tube spiralé étant ainsi formé; placer l'anneau (2b) contre l'extrémité de tube coupée, et, souder l'anneau (2b) à l'extrémité de tube.

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