Shear dolly for long wall mining
US4512706A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 18, 1983 |
| Grant date | Apr 23, 1985 |
| Priority date | — |
| Expiry date | Mar 18, 2003 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21C29/02
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
In the long wall mining of coal, a sectional pan-line is positioned along the working face of the coal seam parallel with the working face. The pan-line sections joined together have parallel rails along which the mining machine travels. At least one of said rails comprises a continuous gear rack at a height above ground with which a power driven gear wheel on the mining machine meshes for propelling the machine back and forth along the face of the coal. This invention is for a wheeled flat bed dolly having two parallel rails, one along each side, that are of height and width matching the rails of the pan-line. There is a support at one end of each of these rails to which the ends of the rails of the pan-line interfit with a temporary connection holding the dolly and pan-line against separation. That rail on the dolly that joins with the gear rack of the pan-line also comprises a gear rack conforming to and matching gear rack on the pan-line, the arrangement enabling the mining machine moving from the pan-line onto the dolly or from the dolly onto the pan-line under its own power. This dispenses with the hours of labor and hazardous work presently required to effect this transition…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.