Expansion shell assembly
US6742966B2 · kind B2 · utility
14Cited by
66References
34Claims
0Family size
Inventor
Key dates
| Filing date | Jan 11, 2002 |
| Grant date | Jun 1, 2004 |
| Priority date | — |
| Expiry date | Jan 11, 2022 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D21/008
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An expansion shell assembly for mine roof bolts includes an expansion member threaded onto an associated mine roof bolt. A support device is annularly disposed around the associated roof bolt. An expansion shell is annularly disposed around the associated roof bolt between the expansion member and the support device. The expansion shell has a base ring for engaging the support device and fingers for engaging a peripheral edge of the tapered plug. The engagement between the base ring and the support device permits axial traverse movement of the support device relative to the expansion shell for tensioning the roof bolt.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.