Drill boom arrangement
US4232848A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 10, 1979 |
| Grant date | Nov 11, 1980 |
| Priority date | — |
| Expiry date | Apr 10, 1999 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16D55/38
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
In a drill boom arrangement, a feed beam for a rock drill is turnable by means of a hydraulic turning device (34) about an axis (45) that is normally parallel with the axis of drilling during drifting. When not actuated, the turning device (34) is at least partially relieved of torque by means of a friction coupling (52) which is coupled in parallel with the turning device and is normally engaged. The coupling is automatically released when the turning device is actuated. A slip-coupling (67) is coupled in parallel with the first coupling (52) and in series with the turning device in order to avoid overloading of the turning device which is hydraulically self-braking.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.