Opening/closing device
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Nov 26, 2013
Grant Date -
Dec 8, 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 includes a gate that receives a flow of a sewage, and can fall toward a downstream side of the flow, a fall prevention unit that prevents the gate from falling by supporting the gate, a support release unit that releases the support for the gate by the fall prevention unit, a first float that is arranged on the upstream side of the gate, and is smaller in specific gravity than the sewage, a surfacing prevention unit that prevents the first float from surfacing, a second float that is arranged on the upstream side of the gate, above the first float, and is smaller in specific gravity than the fluid, and a surfacing-prevention release unit that releases, resulting from surfacing of the second float, the prevention of the surfacing of the first float by the surfacing prevention unit. Further, the support release unit is activated resulting from surfacing of the first float.
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