Threaded connection with improved root thread profile
US9375798B2 · kind B2 · utility
2Cited by
23References
30Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 17, 2014 |
| Grant date | Jun 28, 2016 |
| Priority date | — |
| Expiry date | Jan 25, 2035 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T408/03
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A threaded connection design having a double ellipse in the thread root for reducing stress fatigue is illustrated in this disclosure. The root groove includes a first portion comprising a first elliptical surface being part of a first ellipse. The root groove further includes a second portion comprising a second elliptical surface, being part of a second ellipse, and the second elliptical surface being joined tangentially at a first end to the first elliptical surface at a junction point that defines the bottom of the root groove. The second elliptical surface is joined tangentially at a second end to the load flank.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.