| 摘要 |
PROBLEM TO BE SOLVED: To provide a roof gate which is proof against damaging of an air tube body, and has a simplified air charging/discharging system. SOLUTION: The roof gate 1 is borne on a bottom 4 of a channel 2, and provided with a door body 6 which is rotatable between an erect position U on an upstream side and a laid position D on a downstream side. The roof gate is comprised of the almost cylindrical air tube body 11 which inflates and extends upward when air is charged therein, and deflates and shrinks downward upon discharge of the air. Thus the door body 6 is erected by using an extending force of the air tube body 11, and it is laid down by a shrinking force of the air tube body 11. COPYRIGHT: (C)2006,JPO&NCIPI
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