Coupling for lined pipe
US4277091A · kind A · utility
Inventor
Key dates
| Filing date | Jun 11, 1979 |
| Grant date | Jul 7, 1981 |
| Priority date | — |
| Expiry date | Jun 11, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49945
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
Disclosed are coupling joints for interconnecting the ends of metal conduit sections having plastic liners to form a continuously lined conduit and methods for making such joints. The opposed open ends of lined pipe are fitted with flanged end face collars which cover the end faces of the pipe and the open ends are then joined in an abutting relationship within a coupling sleeve by interference fit coupling. The coupling sleeve carries an internal sealing band which mates with the outer edges of the opposed collars to fully seal the joint and the ends of the coupling sleeve are radially crimped into a corresponding groove in the pipe to mechanically interlock the joint. Fully lined couplings are also formed by fitting an end face collar in the pin end of one lined conduit and interference fitting the pin end into an unlined bell on a lined conduit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.