Support and positioner for rock drill
US4190117A · kind A · utility
5Cited by
13References
9Claims
0Family size
Inventor
Key dates
| Filing date | Sep 12, 1978 |
| Grant date | Feb 26, 1980 |
| Priority date | — |
| Expiry date | Sep 12, 1998 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B7/022
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A support and positioner for a rock drill has an extendable and retractable feed boom pivoting about a pivotal support arranged laterally below the axis of the feed boom, so that when the boom is swung downwardly to maintain a desired line of advance of the drill, the boom rocks forwardly so as to increase axial drilling thrust and the extent of forward movement of the drill, and reduce the bending stresses imposed on the drill steel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.