Mine roof supports
US4792261A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 27, 1987 |
| Grant date | Dec 20, 1988 |
| Priority date | — |
| Expiry date | Mar 27, 2007 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D23/0427
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A self-advancing mine roof support comprising a floor engaging base 11, a roof engaging canopy 12, hydraulic jacks 19a, 19b to urge the base and canopy apart, and a linkage system located towards the rear of the support. The linkage system comprises an inclined shield member 22 pivotally connected to the canopy 12, and at least two links 23, 24 interconnecting the shield and the base. The jacks 19a, 19b, are located substantially halfway along the length of the base and extend substantially vertically from the base. There is a hydraulic jack 18 operable between the roof engaging canopy 12 and the linkage system to effectively counterbalance the projection on the canopy 12 which extends forwardly of the jacks 19a, 19b.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.