Apparatus and method for re-tensioning a loose roof plate in an underground mine
US8740504B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 7, 2012 |
| Grant date | Jun 3, 2014 |
| Priority date | — |
| Expiry date | Jan 29, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T403/7047
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An apparatus for retensioning a loose roof plate held by a roof bolt, includes a main spacer, a washer, and a nut. The main spacer occupies a space between a head of the roof bolt and the loose roof plate, and the main spacer has a threaded circumferential outer surface and a radially extending slot for inserting a shaft of the roof bolt therein. The washer occupies a space between the main spacer and the loose roof plate, and the washer has a radially extending slot for inserting the shaft of the roof bolt therein. The nut has a threaded hole for passing the head of the roof bolt therethrough, for threading onto the threaded spacer and for tightening onto the threaded spacer until the roof plate is firmly pressed against the roof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.