Extension rod for percussive drilling tool
US4061433A · kind A · utility
3Cited by
7References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 20, 1976 |
| Grant date | Dec 6, 1977 |
| Priority date | — |
| Expiry date | Jul 20, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T403/7035
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A composite extension rod for coupling a drilling tool and a hammer which is located outside of the drill hole and has a central tube surrounded by parallel high strength rods and an outer sheath which has coupling sleeves at its ends.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.