Mining machines
US4106815A · kind A · utility
3Cited by
8References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 5, 1976 |
| Grant date | Aug 15, 1978 |
| Priority date | — |
| Expiry date | Nov 5, 1996 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21C27/22
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A mining machine adapted to be driven forwardly towards a working face comprises one or more cutting booms projecting forwardly from the machine, a cutting tool mounted on the forward end of the or each boom, and a drive mechanism for rotating the cutting tool relative to the boom, the said mechanism including a multi-speed gearbox whereby the cutting tool may be selectively driven at two or more different cutting speeds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.