Drill steel
US4749051A · kind A · utility
9Cited by
8References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 26, 1985 |
| Grant date | Jun 7, 1988 |
| Priority date | — |
| Expiry date | Sep 26, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T408/907
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A drill steel for percussion drilling has four longitudinally extending grooves for removal of cuttings. The grooves are shaped such that, in comparison with a hexagonal drill steel, there is obtained an enlarged space for cuttings and a less consumption of material with maintenance of the same resistance to bending.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.