Threaded connection for oil country tubular goods and its method of manufacturing
US6237967A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 4, 1999 |
| Grant date | May 29, 2001 |
| Priority date | — |
| Expiry date | Jun 4, 2019 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L15/004
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
[Purpose] To provide a threaded connection capable of preventing deterioration of gas tightness from occurring when a tensile stress acts thereon after a compressive force in the direction of the axis of a pipe is applied. [Means of Solving Problems] (1) A threaded connection for oil country tubular goods wherein a length (15) of a thick walled portion with a diameter defined in the formula (1), is longer than the length (16) from seal contact to the extremist of the pin section, shorter than a half of the length (17) of the pin section, the rest of inside diameter is equal to the inside diameter of pipe proper, having smooth tapered inner wall between thick walled portion and pipe proper. The inside diameter of the box section of torque shoulder section is the same as inside diameter of thick wall. EQU d0>dx.gtoreq.d0-6 mm (1) Where dx(mm)=inside diameter of the thick walled portion of the pin section, and d0(mm)=inside diameter of the pipe proper.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.