The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 26, 2013
Filed:
Feb. 02, 2010
Hiroshi Komatsu, Chiba, JP;
Motonobu Ito, Saitama, JP;
Kazuhiro Yamanouchi, Chiba, JP;
Kenji Hasegawa, Tokyo, JP;
Iwao Ito, Kanagawa, JP;
Hiroshi Komatsu, Chiba, JP;
Motonobu Ito, Saitama, JP;
Kazuhiro Yamanouchi, Chiba, JP;
Kenji Hasegawa, Tokyo, JP;
Iwao Ito, Kanagawa, JP;
Nippon Koei Co., Ltd., Tokyo, JP;
Tokyo Metropolitan Sewerage Service Corporation, Tokyo, JP;
Kansei Company, Tokyo, JP;
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.