System and method for mine roof counter bore and cable bolt head securement therein
US8052353B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 27, 2008 |
| Grant date | Nov 8, 2011 |
| Priority date | — |
| Expiry date | Mar 22, 2029 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D21/0086
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A mine roof support includes a plate having a raised portion with an opening, and a mine and roof bolt, e.g. a barrel having a drive end and an opposite second end, and wedge assembly. The plate mates with a recess in a mine roof. In one embodiment, the second end of the barrel extends through the opening in the dome into a bore hole in the mine roof. In another embodiment, a second end of the mine bolt is contoured to match and fill the inner contour of the dome. A drill bit tool used to shape the recess includes a first bit, a second bit, and a third bit between the first and second bits to drill a bore hole, enlarge the end of the bore hole to receive the second end of the mine bolt, and to drill the recess.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.