Roof support for tunnel excavator
US4525104A · kind A · utility
1Cited by
2References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 18, 1982 |
| Grant date | Jun 25, 1985 |
| Priority date | — |
| Expiry date | Nov 18, 2002 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D23/06
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A roof support for coal-mining apparatus or other tunnel-excavating equipment has a shield plate with several rearwardly diverging and deepening longitudinal grooves in its upper surface. The grooves are designed to carry off detritus as the support advances and are spaced closely enough to form ribs therebetween adapted to crush larger chunks of overburden landing thereon.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.