Drill boom arrangement
US4232850A · kind A · utility
4Cited by
9References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 10, 1979 |
| Grant date | Nov 11, 1980 |
| Priority date | — |
| Expiry date | Apr 10, 1999 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B7/025
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A hydraulic drill boom arrangement for drifting and tunnelling comprises a boom proper (10) that is universally pivotably carried by a support plate (13) and carries a feed beam (40) for a rock drill (41) at its outer end. Two hydraulic cylinders (16, 17) are coupled between the support plate and the boom and located on each side of the boom so that both cylinders are loaded by the weight of the boom, which makes the boom very stable in all positions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.