Advance mechanism for a mine roof support assembly
US4390308A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 10, 1981 |
| Grant date | Jun 28, 1983 |
| Priority date | — |
| Expiry date | Sep 10, 2001 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D23/0409
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A roof support assembly is constituted by a plurality of roof support units and a plurality of advance mechanisms. The units are positioned side-by-side along a longwall face of a mineral mining working. Each advance mechanism comprises a pair of generally parallel hydraulic advance rams and a guide rod system constituted by a pair of resilient generally parallel guide rods. Each guide rod system is attached, at one end, to a conveyor extending along the longwall face. The other end of each guide rod of each advance mechanism is attached to a respective slide piece which is slidably guided on a respective guide rail which is attached to a respective floor girder of a roof support unit. The slide pieces are attached to the piston rods of the hydraulic advance rams. The cylinders of the hydraulic advance rams are attached to one of the adjacent floor girders, and the slide piece attached to the piston rod of hydraulic advance ram is attached to the guide rod system. The slide piece attached to the piston rod of the hydraulic advance ram is attached to the other floor girder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.