Electrical heatable muff and process for its manufacture
US4147926A · kind A · utility
28Cited by
9References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 15, 1976 |
| Grant date | Apr 3, 1979 |
| Priority date | — |
| Expiry date | Dec 15, 1996 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C66/1142
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An electrically heatable welding muff for connecting plastic pipes has a heating wire winding disposed in a helical groove in its interior wall. To position the pipes to be connected snugly and accurately, longitudinal grooves are cut in the interior wall of the muff so that the material forced out of the grooves projects inwardly, forming resilient retaining tabs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.