Device for drilling, in particular percussion drilling or rotary percussion drilling, boreholes
US6722454B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Aug 23, 2002 |
| Grant date | Apr 20, 2004 |
| Priority date | — |
| Expiry date | Aug 23, 2022 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B7/208
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A device for drilling holes, including a drill bit with a drilling or breaking surface, a drill rod for introducing a rotary or percussive force and for introducing a rinsing or cooling fluid into the drill bit and a sheath pipe which defines a hollow space between the drill rod and the inside of the sheath pipe and which is supported on the drill rod or which can be connected to the drill bit. In a drilling position, the sheath pipe is situated at a distance from the rear side of the drill bit facing away from the breaking surface and the drill bit can be introduced into a rinsing position for the hollow space between the sheath pipe and the drill rod with its rear side resting on the front end of the sheath pipe facing towards the drill bit or can be connected to the front end of the sheath pipe.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.