Patent ID: 6236026
Filing Date: 2001-05-22
Classification: B29C,F16L

Abstract:
A device for welding an accessory comprised of a thermoplastic material to a pipe or to two pipes of thermoplastic material to be connected to one another, the pipe or pipes each having a circumference, wherein the accessory comprises at least two segments which embrace the circumference of the pipe or of the two pipes to be connected to one another, the segments comprising an electrical heating element over at least portions of inner surfaces of the segments contacting the pipe or the two pipes to be connected to one another, wherein the segments are connected to a welding device, the welding device serving as an electrical current source for the heating element via two electrical connecting lines, wherein each of the two connecting lines is connected to one of two connector lines, wherein the two connecting lines and the two connector lines form a line combination for an electrical parallel switching of all heating elements in the accessory, the segments having at outer surfaces thereof two electrical coupling members for supplying and carrying away an electrical current to and from the heating element through the line combination, wherein the line combination carries counter coupling members, and wherein the counter coupling members are contacted with the coupling members of different segments for the accessory, wherein the coupling members and the counter coupling members are different from each other and are not compatible with one another.