# US 2014/0193202 A1 · Door structure for floating flap gate

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- Number: US 2014/0193202 A1
- Document ID: US20140193202A1
- Status: Published application
- Kind: A1
- Application number: 14/239,239
- Filed: 2012-06-05
- Published: 2014-07-10
- Earliest claimed: 2011-08-24
- Assignees: Hitachi Zosen Corporation
- Inventors: Hiroaki Arai; Hideyuki Niizato; Koji Kitamura; Jun Okada; Satoshi Ashida; Kyouichi Nakayasu; Yoshito Yamakawa
- Web page: https://patentgrep.com/patent/US20140193202A1

## CPC

- E02B 7/40: Swinging or turning gates
- E06B 5/003: {Storm doors; Combination-screen-and-storm-doors}
- E02B 3/102: {Permanently installed raisable dykes}
- E06B 3/38: with a horizontal axis of rotation at the top or bottom of the opening {(E06B3/5036 takes precedence)}
- E06B 2009/007: {Flood panels}
- E02B: HYDRAULIC ENGINEERING (ship-lifting E02C; dredging E02F)
- E06B: FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES (shades or blinds for greenhouses A01G9/22; curtains A47H; lids for car boots or bonnets B62D25/10; skylights E04B7/18; sunshades, awnings E04F10/00)

## Abstract

To make it possible to raise a door body even if it is damaged by an impact of vehicle traffic or falling objects when it is in a lowered state, and to keep the door body in a raised state even if it is damaged by a water pressure of a tsunami or a high tide when it is in a raised state. A door body 2 of a floating flap gate 1 is disposed at an opening or at an access way. When water flows in, a forward end 2b of which swings upwards, in a direction in which the water flows in and within a plane in a height direction, around a base end 2a thereof which serves as a center of rotation, to block the opening or the access way. The door body 2 is formed from a hard polyurethane foam 4 in the form of a sheet.

## Claims

### Claim 1

A door structure for a floating flap gate comprising
a door body of a floating flap gate which is disposed at an opening or at an access way, the door body having a forward end which swings upwards, in a direction in which the water flows in and within a plane in a height direction, around a base end thereof which serves as a center of rotation, so as to block the opening or the access way when water flows in,
wherein the door body is formed from a hard polyurethane foam in the form of a sheet.

### Claim 2 (depends on 1)

The door structure for a floating flap gate according to claim 1, wherein a density of the hard polyurethane foam in the form of a sheet is 0.15-0.4 g/cm3

### Claim 3 (depends on 1)

The door structure for a floating flap gate according to claim 1, wherein a metal plate is attached to both sides or to either the front or the back of the hard polyurethane foam in the form of a sheet.

### Claim 4 (depends on 1)

The door structure for a floating flap gate according to claim 1, wherein a metal plate is attached to the entire surface of the hard polyurethane foam in the form of a sheet, or a metal box into which is inserted the hard polyurethane foam in the form of a sheet is covered with a metal cover.

### Claim 5 (depends on 1)

The door structure for a floating flap gate according to claim 1, wherein a metal frame is attached with a bolt to both sides of the hard polyurethane foam in the form of a sheet.

### Claim 6 (depends on 3)

The door structure for a floating flap gate according to claim 3, wherein a metal frame is attached with a bolt to both sides of the hard polyurethane foam in the form of a sheet.

### Claim 7 (depends on 4)

The door structure for a floating flap gate according to claim 4, wherein a metal frame is attached with a bolt to both sides of the hard polyurethane foam in the form of a sheet.

### Claim 8 (depends on 1)

The door structure for a floating flap gate according to claim 1, wherein a metal frame is attached with a rod to both sides of the hard polyurethane foam in the form of a sheet.

### Claim 9 (depends on 3)

The door structure for a floating flap gate according to claim 3, wherein a metal frame is attached with a rod to both sides of the hard polyurethane foam in the form of a sheet.

### Claim 10 (depends on 4)

The door structure for a floating flap gate according to claim 4, wherein a metal frame is attached with a rod to both sides of the hard polyurethane foam in the form of a sheet.