Apparatus for use in under-ground long wall mine workings
US4298231A · kind A · utility
Inventors
Key dates
| Filing date | Jan 14, 1980 |
| Grant date | Nov 3, 1981 |
| Priority date | — |
| Expiry date | Jan 14, 2000 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21C29/10
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The invention is concerned with underground mining equipment, primarily but not exclusively for the mining of coal by the system known as the "long wall system". Where a coal cutting machine is driven along the wall face by the use of a haulage chain anchored at opposite ends of the face, to avoid the problems associated with the establishment of slack chain behind the machine, take-up means is provided at at least the end of the working from which the machine undergoes a working traverse to remove material from the face. Control means is provided to render said take-up means operative, to take up the slack produced in the chain, during such a working traverse of the cutting machine, and to render the take-up means inoperative, to provide a substantially fixed anchorage on a return traverse of the machine. Preferably such take-up means is provided at both ends of the working.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.