Mine roof bolt
US4334803A · kind A · utility
4Cited by
12References
3Claims
0Family size
Inventors
Key dates
| Filing date | Nov 23, 1979 |
| Grant date | Jun 15, 1982 |
| Priority date | — |
| Expiry date | Nov 23, 1999 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D21/0026
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A mine roof bolt of the type used in supporting the ceiling or roofs of underground mine passages is disclosed. The mine bolt includes an elongated shaft, threaded on one end with a stop member in the form of a hemispherical head provided at the other end. A bolt head is force fitted onto the shaft into abutment with the outer stop member. Similarly, a washer is also force fitted onto the shaft and into abutment with the bolt head. An inner stop in the form of an annular bead is formed on the shaft adjacent the underside of the washer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.