| 摘要 |
PROBLEM TO BE SOLVED: To provide a derricking gate which makes costs low by dispensing with the use of a high-strength rubber material, a high-performance compressor, etc. by devising a shape of a bag body so as to increase an area of contact with a door body. SOLUTION: The bag body 4 for turning the door body 3 is constituted by bonding face portions 4B and 4C at both ends, which almost flatly close openings 4b and 4c at both ends in the expanded state of a central body portion 4A, to the central body portion 4A which is expanded in an approximately cylindrical shape long in the width direction of the door body 3. This enables the bag body 4 to be three-dimensionally formed by a so-called three-dimensional cutting method. Thus, both the ends are turned into an approximately flat shape even if the bag body 4 is expanded by the supply of air. This brings the bag body 4 into contact with the door body 3 in such a manner that the width of the door body 3 is almost equal to that of the bag body 3, when the bag body 4 almost equal in width to the door body 3 is installed. Consequently, the area (pressurization area) of the contact of the bag body 4 with the door body 3 is increased. COPYRIGHT: (C)2008,JPO&INPIT
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