Roof bolt drill support
US4932481A · kind A · utility
13Cited by
5References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 2, 1988 |
| Grant date | Jun 12, 1990 |
| Priority date | — |
| Expiry date | Sep 2, 2008 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B19/081
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A mining roof bolt drill feed mechanism whereby the drill is supported on a horizontal pylon extending from an elongate slot in a vertical box section inner strut. The inner strut telescopes within an outer box section strut with an aligned elongate slot, and the pylon is supported on the nut of a dual concentric worm and nut drive system located within the telescopic struts. Elastomeric seals are provided over the elongate slots to prevent the ingress of dust from the mining operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.