Reinforced tubular joint for improved sealing-tightness after plastic expansion
US7581766B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 11, 2003 |
| Grant date | Sep 1, 2009 |
| Priority date | — |
| Expiry date | Aug 4, 2023 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L15/08
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The invention relates to a high-performance threaded tubular joint comprising a first, male tubular element (11) and a second, female tubular element (12) made up together by screwing. One of the tubular elements (11; 12) has a non-threaded lip (38; 5) extending between its thread and its free end and having a sealing surface (40; 7) in sealing-tight contact with the opposite surface (41; 8) of the other element after screwing together, diametric expansion, and then generation of springback forces of the first and second tubular elements. The joint has a tubular sleeve (34; 36) threaded over the second element (12) before screwing together and positioned to extend axially substantially opposite to the lip (3; 5) and, after diametric expansion, generating a springback force which is added to that of the second element in order to counteract the springback force of the first element, thus effecting at least the shrink-fitting of the tubular sleeve over the second element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.