| 摘要 |
PROBLEM TO BE SOLVED: To provide an opening/closing structure quickly opening/closing an opening/closing body in a limited space in the opening/closing structure comprising the opening/closing body tightly closing the hollow cylinder body. SOLUTION: This opening/closing structure comprising a hollow cylinder body 9 and an opening/closing body 21 tightly closing an opening part 24 of the hollow cylinder body 9 is so constituted that the cross section of the opening/closing body 21 is set to an approximately U shape, and the curvature of the internal circumferential face of the opening/closing body 21 is set approximately equal to the curvature of the cross section of the opening part 24 of the hollow cylinder body 9, so that the opening/closing body 21 is prevented from obstructing the cross section of the opening part 24 with the opening/closing body 21 in the full opened state.
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