Earth drilling device for extracting earth samples
US4336849A · kind A · utility
19Cited by
8References
6Claims
0Family size
Inventor
Key dates
| Filing date | Jul 3, 1980 |
| Grant date | Jun 29, 1982 |
| Priority date | — |
| Expiry date | Jul 3, 2000 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B25/02
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An earth drilling device for extracting earth samples including a rotatable drill tube and means for rotating said drill tube, a drill bit supported by said rotatable drill tube, said drill bit and said drill tube defining an inner shoulder, a hollow probe movably disposed within said drill tube and adapted to be supported by said inner shoulder, an exchangeable plastic sleeve disposed within said hollow probe, and means for extracting said hollow probe and associated plastic sleeve containing an earth sample without removing the drill tube from the earth.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.