Welding muff of thermoplastic material
US4349219A · kind A · utility
21Cited by
5References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 21, 1979 |
| Grant date | Sep 14, 1982 |
| Priority date | — |
| Expiry date | Dec 21, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B3/18
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An electric welding muff for joining thermoplastic line elements comprising a welding sleeve and an electrical resistance heating wire. The sleeve is formed of thermoplastic material. The heating wire is wound in a plurality of turns and embedded in the sleeve adjacent one of its lateral surfaces and has peripherally spaced deformation points diverging from the general course of the turns. During manufacture and welding, the heating wire remains in its predetermined position since expansion of the wire is absorbed at the deformation points.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.