Bolt centralizer
US6598309B1 · kind B1 · utility
18Cited by
9References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 30, 2002 |
| Grant date | Jul 29, 2003 |
| Priority date | — |
| Expiry date | Apr 30, 2022 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D20/006
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A bolt centralizer for a rock bolter, which advances a bolt along a work axis, has a hand pivotably mounted on an arm so as to pivot between first and second hand positions. A pair of fingers is pivotably attached to the hand. When the fingers are in a closed position, they form a centralizer passage which is aligned with the work axis when the hand is in the first hand position. The hand is pivoted to the second hand position to remove the fingers from the bolt to allow a bolt plate and bolt driver to be advanced past the hand.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.