Flood protection for underground air vents
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United States of America Patent
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Sep 5, 2017
Grant Date -
Apr 7, 2016
app pub date -
Oct 6, 2014
filing date -
Oct 6, 2013
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Apparatus for allowing ventilation as usual for underground tunnels through a ventilation shaft opening to atmosphere yet preventing underground flooding from surface waters pouring through the grate, comprises an assembly that fits within the ventilation shaft and includes one or more panels held in an upright home position that allows ventilation as usual but is releasable to rotationally gravitate to a lower sealing position closing a passage between the ventilation shaft and atmosphere to prevent water from entering the underground tunnels. A panel position indicator moves from a hidden position to a visible position with lowering of the panels to visually signify that the panels are lowered and that flooding protection is activated.
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