Fatigue-resistant threaded component for a tubular threaded joint
US7513534B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Mar 4, 2002 |
| Grant date | Apr 7, 2009 |
| Priority date | — |
| Expiry date | Mar 4, 2022 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L15/004
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A fatigue-resistant threaded element for a threaded tubular connection. A portion of threads of the threaded element have a helical groove opening into the threaded crest. A groove is formed in all or a portion of the threads of one or both end zones, namely the first engaged thread zone and the last engaged thread zone, and it is optionally formed in the threads of the medial thread zone. The groove reduces stiffness of threads carrying a groove in the end zone or zones compared with the stiffness of the threads in the medial thread zone. The threaded tubular connection obtained after making up the threaded element with a mating threaded element is much more resistant to cyclic tensile stress and/or axial compressive stresses and/or flexion stresses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.