Mine roof support assembly
US5100263A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 29, 1990 |
| Grant date | Mar 31, 1992 |
| Priority date | — |
| Expiry date | Oct 29, 2010 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D23/0436
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A mine roof support includes a ground engaging base section, a roof engageable canopy, and hydraulic props for raising and lowering the canopy relative to the base section. An advancing mechanism is provided for advancing the roof support towards the mine face, and a base lifting mechanism is provided for raising one end of the roof support prior to advancing the support towards the mine face. The base lifting mechanism includes a lifting ram mounted with respect to the base section for slidable movement between an upper operative position in which the ram can be extended to lift the one end of the roof support clear of the ground and a lower position in which the canopy can assume a position relative to the base section lower than would be possible with the lifting ram in its upper operative position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.