Adjustable stairway for use with an overcast in a mine

Details Adjustable stairway for use with an overcast in a mine Adjustable stairway for use with an overcast in a mine

E - Fixed Constructions

21

F

E21F 17/00 (2006.01) E04F 11/00 (2006.01) E04F 11/025 (2006.01) E04F 11/06 (2006.01) E21F 1/14 (2006.01)

Patent

CA 2322064

An overcast system for a mine is disclosed. The system includes and overcast positioned at an intersection of mine passageways and operable to direct airflow through the passageways in a desired flow pattern at the intersection. Stairways are positioned adjacent opposite sides of the overcast providing a means for people to traverse between the opposite sides of the overcast. The stairways are self adjusting to accommodate overcasts of different heights while providing generally horizontal steps. The stairways are constructed with knockdown assembly means to provide for easy assembly and disassembly in the mine.

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