Roof support for underground excavations such as coal mines
AssigneeVoest-Alpine Bergtechnik Gesellschaft m.b.H.
InventorsAlfred Zitz, Karl Lerchbaum, Heinrich Suessenbeck
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Abstract
A roof support for the ceilings of excavated spaces underground and particularly for supporting caving edges for pillar recovery in coal mines is described. The roof support has a roof bar connected to a base frame by hydraulically extendable props and by a lemniscate mechanism. The props are articulated to the base frame and to the roof bar. A link of the lemniscate mechanism has a predetermined bending point. Since this link fails when overloaded before the remainder of the apparatus, it is the only element that need be replaced when the apparatus is overloaded. Thus, the device may be economically repaired.
Claims8
A support for supporting the roof and shielding the caving area in underground excavations, and particularly for waste-edge support in pillar extraction in coal mines, said support comprising:
- a base frame;
- a roof bar braced against said base frame by means of hydraulically extendable props and a lemniscate mechanism, the props being articulated to the base frame and the roof bar;
- wherein at least one link of the lemniscate mechanism is provided with a predetermined bending point.
Dependencies are inferred from the claim text.