Mine roof supports
Patent
·
OSTI ID:6517150
A mine roof support has a main roof bar which is pivotably connected to an auxiliary forwardly-extendible bar. A piston and cylinder unit serves to swing the auxiliary bar about the main bar to bring the auxiliary bar into a roof-contacting position aligned with the main bar or into a stowed position beneath the main bar or into some intermediate position. Pivotable guide members connect between the main and auxiliary bars respectively and a pivot joint linked to the piston and cylinder unit. The guide members can take the form of simple straps or levers but an additional piston and cylinder unit can also be used as one of the guide members.
- Assignee:
- Gewerkschaft Eisenhutte Westfalia (Germany, Federal Republic of)
- Patent Number(s):
- US 4347021
- OSTI ID:
- 6517150
- Country of Publication:
- United States
- Language:
- English
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