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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)
B PERFORMING OPERATIONS; TRANSPORTING
29
WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
C
SHAPING OR JOINING OF PLASTICS; SHAPING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; AFTER- TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
65
Joining of preformed parts; Apparatus therefor
02
by heating, with or without pressure
34
using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
16
ENGINEERING ELEMENTS OR UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
L
PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
47
Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
02
Welded joints; Adhesive joints
03
Welded joints with an electrical resistance incorporated in the joint
H ELECTRICITY
05
ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
B
ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
3
Ohmic-resistance heating
10
Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
18
the conductor being embedded in an insulating material
Applicants:
Inventors:
Priority Data:
4344/7821.04.1978CH
Title (EN) WELDING SLEEVE OF THERMOPLASTIC MATERIAL
(FR) MANCHON A SOUDER EN MATIERE THERMOPLASTIQUE
Abstract:
(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)
Also published as:
US4349219