Mine roof supporting truss system
US4596496A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 22, 1984 |
| Grant date | Jun 24, 1986 |
| Priority date | — |
| Expiry date | Aug 22, 2004 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D21/0086
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A truss system is disclosed for use in supporting the roof of a mine. The system comprises an assemblage of elements which permit more rapid and efficient installation than prior art truss systems which have generally been installed as a secondary operation, after the standard, required bolting pattern is in place. The present system, on the other hand, may be installed concurrently with and in fact may become part of, the standard bolting system. The system includes a pair of roof bolts installed in conventional fashion in drill holes extending at divergent angles into the mine roof on opposite sides of the mine opening. The bolts each extend through aligned openings in a bearing support plate and a separate angle block having a curved outer surface. The closed ends of a U-bolt, having a curvature corresponding to the surface of the angle block, extend around the two blocks with the open, threaded ends of the U-bolts facing one another. A pair of blocks having three parallel openings therethrough are placed on the two U-bolts, the open ends thereof extending through the outer openings, and secured with nuts. A rod threaded at both ends, or a plurality of such rods joined by a thre…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.