| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a folding door type navigation gate, in which a lower part of a door protrudes from a U-shaped gate frame when the gate is opened, and the lower part is brought into contact with a lake bottom or a dam bottom when the gate is used at the time of a low water level, thereby preventing the door from being related to damage. <P>SOLUTION: An upper stage door 1a, a middle stage door 1b, and a lower stage door 1c, which are vertically separated into three portions, are rotatably connected by hinges 2, 4, 5, respectively, to a U-shaped gate frame D supported by a float C in half-submerged state. The upper stage door 1a, the middle stage door 1b, and the lower stage door 1c, which are vertically separated into three portions, are vertically foldable. This is not a type of one door vertically moving to open and close a gate, therefore the gate can be opened even at the time of a low water level. <P>COPYRIGHT: (C)2012,JPO&INPIT |
