Yielding head for mine support
US5791823A · kind A · utility
20Cited by
6References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 6, 1996 |
| Grant date | Aug 11, 1998 |
| Priority date | — |
| Expiry date | Dec 6, 2016 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D21/0026
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A yielding head for reducing the need to recondition a rock mass. The yielding head includes a mine hole cradle and a longitudinally movable bar therein. The bar, which is connected to an extension bolt, is registered with a collapsible bubble serrated yielding element circumscribing the bar. As the rock mass is displaced the bar is drawn into the mine hole. The yielding element absorbs the stress on the bar in a controlled manner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.