Mine roof supports
US3991580A · kind A · utility
4Cited by
5References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 28, 1975 |
| Grant date | Nov 16, 1976 |
| Priority date | — |
| Expiry date | Aug 28, 1995 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D23/085
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A self-advancing mine roof support of which the ground-engaging structure comprises a pair of spaced apart skids in the spacing between which the relay bar structure of the advancing mechanism is housed, such structure being powered by a pair of pressure-fluid operated rams disposed one adjacent each of said two skids.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.