Machines for positioning roof supports in a tunnel
US4260297A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 26, 1978 |
| Grant date | Apr 7, 1981 |
| Priority date | — |
| Expiry date | Sep 26, 1998 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D11/40
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The present invention is directed to a machine for positioning roof supports in a tunnel. The machine includes a body unit having a track engaging assembly by which the body unit may be suspended from an overhead track extending along the length of the tunnel. A drive motor is provided for impelling the body unit along the track. An arm assembly support member is mounted on the body unit for pivotal movement about a vertical axis under the control of a slewing actuator. In addition, an arm assembly is pivotally connected at one end thereof to the arm assembly support member for pivotal movement about a horizontal axis under the control of a lifting actuator. A yoke holder is mounted at the opposite end of the arm assembly so as to maintain a constant attitude during the raising and lowering of the arm assembly between a lowered position and a raised position of the arm assembly. Lastly, a yoke is provided for supporting a roof support and pivotally mounted to the yoke holder for pivotal movement about a vertical axis under the control of a pivoting actuator and control member to control actuation of the pivoting actuator and the slewing actuator so that movement of the arm assembly…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.