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:
Sep. 17, 2019
Filed:
Jun. 18, 2015
Nippon Koei Co., Ltd., Tokyo, JP;
Tokyo Metropolitan Sewerage Service Corporation, Tokyo, JP;
Kansei Company, Tokyo, JP;
Motonobu Ito, Saitama, JP;
Tamotsu Kikuchi, Tokyo, JP;
Takato Aoyama, Tochigi, JP;
Takaaki Odate, Saitama, JP;
Kenji Hasegawa, Tokyo, JP;
Osamu Igawa, Tokyo, JP;
NIPPON KOEI CO., LTD., Tokyo, JP;
TOKYO METROPOLITAN SEWERAGE SERVICE CORPORATION, Tokyo, JP;
KANSEI COMPANY, Tokyo, JP;
Abstract
An opening/closing device according to the present invention includes a gate, a fall prevention unit, a support release unit, a first float, a floating prevention unit, a second float, and a floating prevention release unit. The gate receives a flow of fluid, and is able to fall down toward a downstream direction of the flow. The fall prevention unit supports the gate, thereby preventing the gate from falling down. The support release unit releases the support for the gate by the fall prevention unit. The first float is arranged on an upstream side of the gate, is arranged on one of the left side and the right side of the gate viewed from upstream, and is less in the specific gravity than the fluid. The floating prevention unit prevents the first float from floating.