Thread joint and threaded components for percussive drilling components
US6767156B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 27, 2000 |
| Grant date | Jul 27, 2004 |
| Priority date | — |
| Expiry date | Nov 27, 2020 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/0426
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Two components used in a percussive drill string include a spigot and a sleeve, respectively. The spigot includes a male thread connected to a female thread of the sleeve to form a thread joint. The male and female threads are dimensioned such that axially inner and outer end areas of the female thread are in non-engagement with the male thread when the thread joint is in a tightened state. The spigot includes axially inner and outer conical guiding surfaces facing toward respective axially outer and inner conical guiding surfaces, respectively. Each conical guiding surface forms an angle with a centerline of the sleeve, the angle lying in the range 1 to 20 degrees, to prevent the spigot and the sleeve from being welded together by frictional heat during a drilling operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.