1975-08-12
1976-08-03
O'Dea, William F.
E21F 114
Patent
active
039722724
ABSTRACT:
A mine brattice for closing a mine tunnel against the passage of gas including a yieldable framework of lap jointed plate-like beam members having a peripheral configuration corresponding roughly to the peripheral surface configuration of the tunnel to be closed and a sheet metal barrier secured to the framework and extending peripherally beyond the framework into gas sealing engagement with the tunnel surfaces. The barrier is formed of malleable sheet metal such as aluminum by which it may be bent into precise sealing configuration with the rock surfaces of the tunnel. The framework may be supported by anchorage brackets secured directly in the roof, rib and floor surfaces of the tunnel or alternatively on telescopic posts having yieldable shear pin retention means by which telescopic foreshortening of the posts in increments corresponding to spacing of shear pins is permitted to accommodate floor-roof squeeze.
REFERENCES:
patent: 1478303 (1923-12-01), Snyder
patent: 1594921 (1926-08-01), Barnett
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patent: 2357819 (1944-09-01), Greer
patent: 2621725 (1952-12-01), Shacikoski
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patent: 2729065 (1956-01-01), Craggs et al.
patent: 3863554 (1975-02-01), Boyd
Bagby Brattices, Inc.
Joyce Harold
O'Dea William F.
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