Balanced ventilation doors
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United States of America Patent
Stats
-
Mar 26, 2002
Grant Date -
Jul 12, 2001
app pub date -
Feb 20, 2001
filing date -
Jan 15, 1999
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A pair of door-sections make up a mine ventilation door. The door-sections are hinged to the side-walls of the passage. One of the door-sections opens upstream and the other downstream, so one is blown open, and the other blown closed, by winds passing through the passage. A linkage couples the door-sections, and harnesses the blow-open force and balances it against the blow-closed force, whereby only a small actuation force is needed to open and close the doors. The linkage ensures that the arcuate travels of the two door-sections are equal, or otherwise correspond.
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