Mine prop
US5314161A · kind A · utility
7Cited by
7References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 29, 1992 |
| Grant date | May 24, 1994 |
| Priority date | — |
| Expiry date | May 29, 2012 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04G2025/042
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A mine prop has a post or column formed by two telescopingly interfitted tubes, one of which has a bottleneck configuration over which the other is spread to provide a resistance to telescoping contraction. At the upper end, a nut is rotatable on the post and can advance the threaded spindle engaged therein to brace the prop between the roof and ceiling of a subterranean structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.