Drill steel for drilling mine roofs and associated method of drilling bores
US6598688B2 · kind B2 · utility
7Cited by
13References
16Claims
0Family size
Inventor
Key dates
| Filing date | Jul 16, 2001 |
| Grant date | Jul 29, 2003 |
| Priority date | — |
| Expiry date | Jul 16, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T403/7098
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A drill member, or “drill steel,” is used in a drilling system for installing roof bolts in a mine. The drill member comprises an elongated bar having a central through bore and opposite open ends. The bar has a cross section that defines a circular outside perimeter and a polygonal inside perimeter. The polygonal inside perimeter is configured for coupling of the drill steel to drill bits at one end and to a motorized drill driving device at an opposite end.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.