Roof support for underground excavations such as coal mines

Details Roof support for underground excavations such as coal mines Roof support for underground excavations such as coal mines

1991-09-26

1993-01-12

Reese, Randolph A.

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

405291, 405299, 248548, E21D 1544

Patent

active

051784947

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.

REFERENCES:
patent: 4140430 (1979-02-01), Blumenthal et al.
patent: 4915540 (1990-04-01), Kennedy et al.

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