Fast make-up fatigue resistant rotary shouldered connection
US7455329B2 · kind B2 · utility
17Cited by
29References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 9, 2005 |
| Grant date | Nov 25, 2008 |
| Priority date | — |
| Expiry date | Jan 30, 2027 |
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 may be cut on multiple cutting radii having displaced centers. At least two of the root surfaces formed by cutting radii may have lengths that are greater than the root truncation. The threads may be 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.