Opening/closing device
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United States of America Patent
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Apr 15, 2014
Grant Date -
Dec 1, 2011
app pub date -
Feb 2, 2010
filing date -
Feb 4, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
An opening/closing device 1 according to the present invention includes a gate 10 that receives a flow of a sewage W in an upright state, and can fall toward a downstream side of the flow and a first spring 52a that generates a force for bringing the gate 10 into an upright state, wherein the first spring 52 generates a force insufficient for bringing the gate 10 into the upright state if the gate 10 is in a fallen state, and generates a force sufficient for bringing the gate into the upright state if the gate 10 is tilted by an angle equal to or less than a predetermined angle.
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