Mine roof supports
US4062194A · kind A · utility
1Cited by
3References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 13, 1976 |
| Grant date | Dec 13, 1977 |
| Priority date | — |
| Expiry date | Feb 13, 1996 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D23/06
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A roof-engaging assembly for a mine roof support having prop or jack means to engage and support the roof-engaging assembly, comprises a rigid part to engage said prop or jack means, and a roof-engaging part positioned over and resiliently urged away from the rigid part. Preferably the rigid part has a roof-engaging face and a relatively stepped or recessed face below the roof-engaging face, the roof-engaging part being positioned over and resiliently urged away from the stepped or recessed face and towards positions above the roof-engaging face of the rigid part.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.