Locking slip joint and method of use
US4178020A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 15, 1977 |
| Grant date | Dec 11, 1979 |
| Priority date | — |
| Expiry date | Dec 15, 1997 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L37/002
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A locking slip joint has primary utility in the making up of a tie-in in pipeline laying and repair operations. In a preferred embodiment the slip joint comprises an inner sleeve telescopically received within an outer sleeve. Means for locking the sleeves together is disposed in an annulus between the sleeves and comprises a seal ring having annular teeth in communication with both sleeves. A pair of opposed tapered annular pistons engage mating recesses in the seal ring and are hydraulically actuated to deform the seal ring outwardly thereby embedding the teeth into both sleeves. The embedment provides an irreversible metal-to-metal seal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.