Fast make-up fatigue resistant rotary shouldered connection
US7416374B2 · kind B2 · utility
27Cited by
10References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 29, 2004 |
| Grant date | Aug 26, 2008 |
| Priority date | — |
| Expiry date | Jun 17, 2024 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/042
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A thread form having improved strength and fatigue resistance. The root of the thread is cut on multiple cutting radii having displaced centers. At least two of the root surfaces are formed by cutting radii having lengths that are greater than the root truncation. The threads are used in a double start configuration to increase the connection strength and reduce makeup and breakout rotations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.