Yieldable mine roof support fixture
US4378180A · kind A · utility
17Cited by
10References
8Claims
0Family size
Inventor
Key dates
| Filing date | Nov 5, 1980 |
| Grant date | Mar 29, 1983 |
| Priority date | — |
| Expiry date | Nov 5, 2000 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D21/008
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A yieldable mine roof support fixture in which a support member is anchored in a borehole in the geologic mass and is formed with a divergent tapering end adjacent the mine roof which cooperates with a support plate having an opening engaged with the tapering end and yieldable so as to allow the plate to slide or move along the tapering end for imposing resistance to movement of the geologic mass which varies from substantially constant to progressively increasing resistance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.