Non-directional smoke control damper having chain gear type blade advancing/retreating device
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United States of America Patent
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Sep 27, 2016
Grant Date -
Mar 6, 2014
app pub date -
Feb 14, 2013
filing date -
Feb 16, 2012
priority date (Note) -
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Abstract
A non-directional smoke control damper includes a central blade (11), a plurality of outer blades (12) and a blade advancing/retreating device; an outer edge of the central blade (11) overlaps with an opening edge of the plurality of outer blades (12); a support shaft (110) is disposed to pass through the overlapping portion of the edges; a rear end of the support shaft (110) is coupled through a shaft coupling plate (230); and if the central blade (11) advances forwards, the plurality of outer blades (12) advance forwards in order so that a gap is formed at each edge between the central blade (11) and an adjacent outer blade and between a prior-order outer blade and a posterior outer blade to form a blowing passage, thereby allowing an air current to flow into the vestibule through the blowing passage.
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