Tokyo Metropolitan Sewerage Service Corporation

Nippon Koei Co., Ltd.

Kansei Company

Motonobu Ito

Kenji Hasegawa

Hiroshi Komatsu

Iwao Ito

Kazuhiro Yamanouchi

Takaaki Odate

Tamotsu Kikuchi

Osamu Igawa

Takato Aoyama

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.

Opening/closing device

An opening/closing deviceaccording to the present invention includes a gatethat receives a flow of a sewage W in an upright state, and can fall toward a downstream side of the flow and a first springthat generates a force for bringing the gateinto an upright state, wherein the first springgenerates a force insufficient for bringing the gateinto the upright state if the gateis in a fallen state, and generates a force sufficient for bringing the gate into the upright state if the gateis tilted by an angle equal to or less than a predetermined angle.

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.

Growing community of inventors

Saitama, Japan

Motonobu Ito