Method of coupling plastic pipes by welding and a connection piece for coupling same
US4176274A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 20, 1977 |
| Grant date | Nov 27, 1979 |
| Priority date | — |
| Expiry date | Apr 20, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49881
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The coupling of two tubular elements is achieved by welding them together by energization of an electrical resistance element, the one element comprising a male end, the other a socket end. The coupling operation is carried out by means of a composite connecting piece comprising two rings which are fitted on one another, one acting as a support for a bifilar electrical resistance element and the other as a sheath. The electrical resistance element is thus uniformly coated in plastic material and is accurately centered, thereby ensuring uniform heating and welding. This coupling method is for use in coupling discharge pipelines for waste water and rain water and for conduits for industrial fluids.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.