Prefabricated metal overcast having a crushable lower section
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Oct 10, 2000
Grant Date -
N/A
app pub date -
Jan 26, 1999
filing date -
Jan 26, 1999
priority date (Note) -
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Abstract
A ventilation overcast may comprise a plurality of support columns, each of which has an upper end and a lower end. A plurality of cross beams are connected between the upper ends of each of the plurality of support columns so that the support columns and cross beams define a generally rectangular structure having two opposed side wall portions and a roof portion. A curtain member having a plurality of longitudinal corrugations therein is positioned between the lower ends of adjacent support columns located on the same side wall portion of the ventilation overcast so that a bottom portion of the curtain member contacts the floor of the mine. The longitudinal corrugations allow the curtain member to be crushed when subjected to floor heave.
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