Drill rod for percussion drilling
US5064004A · kind A · utility
149Cited by
9References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 25, 1989 |
| Grant date | Nov 12, 1991 |
| Priority date | — |
| Expiry date | Jul 25, 2009 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/0426
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The present invention relates to a drill rod for percussion drilling machine comprising a rod or a sleeve-shaped element that is provided with a threaded portion for engagement with another correspondingly threaded drill rod element. In order to reduce the risk for pitting damage, the threaded portion is provided with a wear lining that is metallurgically bonded to the rod. The lining is made of a metallic material that is softer than the material of the element, the latter usually being steel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.