Flap gate
AssigneeHitachi Zosen Corporation
InventorsYuichiro Kimura, Kunie Miyamoto, Kyoichi Nakayasu, Toshiaki Morii
Life of this patent
Estimating the term…
Abstract
A flap gate includes a door body and a flap ancillary part. When the door body is in its down position, a movable end portion of the door body is located forward of a supported end portion. The door body changes its position between the down position and a maximum up position. The flap ancillary part applies tilt-up moment to the door body only when the door body is located in a position between the down position and a first position. The flap ancillary part also applies tilt-down moment to the door body only when the door body is located in a position between the maximum up position and a second position.
Claims10
A flap gate provided in an opening and configured to tilt up to block said opening when water flows in from said opening, the flap gate comprising:
- a door body whose movable end portion is located forward of a supported end portion, the movable end portion being on a side from which water flows in, when said door body is in a down position, and the door body being configured to change position between said down position and a maximum up position by turning on said supported end portion serving as a support;
- and
- a flap ancillary part that applies tilt-up moment to said door body only when said door body is located in a position between said down position and a first position that is between said down position and said maximum up position, and applies tilt-down moment to said door body only when said door body is located in a position between said maximum up position and a second position that is between said first position and said maximum up position,
- wherein when said door body is located in a position between said first position and said second position, tilt-up moment produced by the water and not any portion of the flap ancillary part, and tilt-down moment produced by the weight of said door body act on said door body.
A flap gate provided in an opening and configured to tilt up to block said opening when water flows in from said opening, the flap gate comprising:
- a door body whose movable end portion is located forward of a supported end portion when said door body is in a down position, and the door body being configured to change position between said down position and a maximum up position by turning on said supported end portion serving as a support;
- and
- a tilt-down ancillary part that applies tilt-down moment to said door body only when said door body is located in a position between said maximum up position and a second position that is between said down position and said maximum up position,
- wherein said tilt-down ancillary part is disposed on a lower side of an upper surface of said door body that is in said down position,
- said tilt-down ancillary part includes:
- a tilt-down elastic member that is a string- or band-like elastomeric resin member having opposite end portions fixed respectively to a floor surface and said door body, and that is expandable and contractible in a longitudinal direction;
- and
- a tilt-up limit member that is a string or band-like member having opposite end portions fixed respectively to said floor surface and said door body,
- said tilt-down elastic member is expanded when said door body is located in a position between said second position and said maximum up position, and
- said tilt-up limit member extends linearly when said door body is in said maximum up position.
A flap gate provided in an opening and configured to tilt up to block said opening when water flows in from said opening, the flap gate comprising:
- a door body whose movable end portion is located forward of a supported end portion, the movable end portion being on a side from which water flows in, when said door body is in a down position, and the door body being configured to change position between said down position and a maximum up position by turning on said supported end portion serving as a support;
- and
- a flap ancillary part configured to apply tilt-up moment to said door body only when said door body is located in a position between said down position and a first position that is between said down position and said maximum up position, applies tilt-down moment to said door body only when said door body is located in a position between said maximum up position and a second position that is between said first position and said maximum up position,
- wherein the flap ancillary part does not apply any tilt-up moment or tilt-down moment when said door body is located in a position between said first position and said second position.
Dependencies are inferred from the claim text.