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Machine translation
1. (WO1979000961) WELDING SLEEVE OF THERMOPLASTIC MATERIAL
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1979/000961    International Application No.:    PCT/CH1979/000054
Publication Date: 15.11.1979 International Filing Date: 19.04.1979
IPC:
B29C 65/34 (2006.01), F16L 47/03 (2006.01), H05B 3/18 (2006.01)
Applicants:
Inventors:
Priority Data:
4344/78 21.04.1978 CH
Title (EN) WELDING SLEEVE OF THERMOPLASTIC MATERIAL
(FR) MANCHON A SOUDER EN MATIERE THERMOPLASTIQUE
Abstract: front page image
(EN)The welding sleeve used for connecting pipes (1, 2) made of thermoplastic material comprises a body (3) provided on its internal wall (14) with a winding formed by a resistance wire (10). The body (3) of the sleeve comprises a center part (4) provided with grooves (8) wherein the resistance wire (10) is wound. Protrusions at the bottom of the grooves cause the formation of points of inflexion in the spirals of the winding. The center part (4) is surrounded by external part (5). During welding of the sleeve, the spirals extend and, in the absence of these points of inflexion (16), they would separate from the internal wall. Owing to these points of inflexion (16), the resistance wire (10) is deformed only at these points and the spirals remain in position. For manufacturing a body of a sleeve in one piece, the resistance wire is wound about a cast piece provided with protrusions, on which the body (3) of the sleeve is cast by injection and from which the body (3) is removed after cooling.
(FR)Le manchon a souder utilise pour relier des tuyaux (1, 2) en matiere thermoplastique comprend un corps (3) muni a sa paroi interieure (14) d"un bobinage fore d"un fil a resistance (10). Le corps (3) du manchon comporte une partie centrale (4) dotee de rainures (8) dans lesquelles est enroule le fil a resistance (10). Des saillies au fond des rainures provoquent la formation de points d"inflexion dans les spires du bobinage. La partie centrale (4) est entouree d"une partie exterieure (5). Lors de la soudure du manchon, les spires (12) s"allongent et, en l"absence de ces points d"inflexion (16), elles se separeraient de la paroi interieure. Grace a ces points d"inflexion (16) le fil a resistance (10) ne se deforme qu"a ces endroits et les spires conservent leur position. Pour la fabrication d"un corps de manchon en une piece on bobine le fil a resistance sur une piece moulee munie de saillies, sur laquelle on moule par injection le corps (3) de manchon et de laquelle le corps (3) est enleve apres refroidissement.
Designated States:
Publication Language: German (DE)
Filing Language: German (DE)