Internal obturators for pipes
US4442867A · kind A · utility
6Cited by
7References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 15, 1983 |
| Grant date | Apr 17, 1984 |
| Priority date | — |
| Expiry date | Apr 15, 2003 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L55/1283
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The invention relates to an internal obturator for a pipe for use in separating two spaces inside a pipe. The obturator comprises a rigid hollow body comprising two end plates connected by a cylinder having a lesser diameter than the end plates between which an annular inflatable bladder of a jack is provided extending around the cylinder. The jack is inflated to apply a cylindrical wall against the inner surface of the wall of the pipe. The wall which is independent of the bladder of the jack may be connected by its ends to the end plates or may simply be inserted therebetween.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.