초록 ▼

A method and apparatus are disclosed for a thermoplastic profile wall pipe joint or weld assembly without the use of a coupler to provide for a leak free pipe joint with substantially flush interior and exterior surfaces. The pipe joint consists of configuring the two pipe ends to be joined by remov

A method and apparatus are disclosed for a thermoplastic profile wall pipe joint or weld assembly without the use of a coupler to provide for a leak free pipe joint with substantially flush interior and exterior surfaces. The pipe joint consists of configuring the two pipe ends to be joined by removing substantially all of a first wall and the helical rib from the first pipe end, removing a portion of the helical rib from the second pipe end, coupling the pipe ends together and heating the weld assembly couple to fusion weld the pipe ends together. An electrical resistance element is provided for and placed within the pipe joint to provide the required heat. Also disclosed is the use of a thermoplastic sheet with the electrical resistance element to allow the end margins of the electrical resistance element to overlap without shorting by separating the end margins radially from one another and to allow for a more uniform fusion welded pipe joint. The resulting joint is a leak free joint with no interior flow obstructions or exterior collars or protrusions without the need for a coupler.

대표청구항 ▼

[ What is claimed is:] [1.] A coupling for uniting thermoplastic pipes, the coupling comprising:first and second thermoplastic pipes, each pipe having first and second concentric, radially spaced cylindrical walls and a helical rib joining the first and second walls;the first walls of both the first

[ What is claimed is:] [1.] A coupling for uniting thermoplastic pipes, the coupling comprising:first and second thermoplastic pipes, each pipe having first and second concentric, radially spaced cylindrical walls and a helical rib joining the first and second walls;the first walls of both the first and second pipes being one of interior and exterior walls of the first and second pipes and the second walls of both the first and second pipes being the other of the interior and exterior walls of the first and second pipes;an end on the first pipe being devoid of substantially all of the helical rib and substantially all of the first wall for an axial distance at the end of the first pipe; andan end on the second pipe being devoid of a portion of the helical rib for an axial distance at the end of the second pipe, the second wall of the end of the second pipe being deflectable radially toward the first wall of the end of the second pipe to a position where the end of the first pipe can be telescopically coupled with the end of the second pipe with the second wall of the end of the first pipe positioned overlapping and engaging with the second wall of the end of the second pipe.