Mine roof support assembly
US4217067A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 14, 1979 |
| Grant date | Aug 12, 1980 |
| Priority date | — |
| Expiry date | Feb 14, 1999 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D23/0481
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The invention relates to a mine roof support assembly for use in winning mineral material from a mineral mining working having a mineral face. The assembly comprises three roof support units positioned side-by-side along the face, and a goaf shield common to the three units. Each of the roof support units has a roof shield supported on a floor sill. The goaf shield is adjustable in height so as to extend from the floor to the roof of the working. Advance means are provided for advancing the roof support units towards the face, and further advance means are provided for advancing the goaf shield to follow up the advance of the roof support units. The further advance means acts between the goaf shield and the roof support units, and is such as to advance the goaf shield by a distance greater than the distance through which the advance means advances the roof support units.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.