Tubular threaded joint with trapezoid threads having convex bulged thread surface
US7331614B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Feb 4, 2002 |
| Grant date | Feb 19, 2008 |
| Priority date | — |
| Expiry date | Feb 4, 2022 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L15/06
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A threaded tubular connection includes two elements, male and female, made up one into the other to a given torque in which, prior to making up, at least one thread face under contact pressure has a convexly rounded shape that is continuous over its width with a radius of curvature in the range 2 to 60 mm and is in point contact with the corresponding face of the mating element. Such a threaded connection has an increased resistance to breakout or to overtorquing. In one embodiment, the convexly rounded face is a male or female thread flank and one of the male or female threads includes a groove opening into the thread crest to render flexible either the convexly rounded flank or the corresponding flank. Such a geometry can accommodate variations in contact between the flanks.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.