Machines for positioning roof supports in a tunnel
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 piike valve portion ift are sucked do pyrolysis chamber where they are covered bye chosen metal dihalide vapor is ionized by ; the total economic market potential is 64.4% of the technical potential, or 2072.4 MW, equivalent to 83,621 BPDE; and the lack of an operating history-detailing system reliability, safety, and operating costs-iment and test components; technology testing; analytmperature fatigue stren obtained.
- Assignee:
- Edbro Ltd (United Kingdom)
- Patent Number(s):
- US 4260297
- OSTI ID:
- 6259141
- Country of Publication:
- United States
- Language:
- English
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