| 摘要 |
PROBLEM TO BE SOLVED: To form an entrance of a pipe house as wide as possible. SOLUTION: Horizontal sash bars 5 are disposed in plural upper and lower stages of a square flexible sheet 4, a shaft is disposed on the upper end of the flexible sheet 4, the shaft is rotably disposed on the upper end part of a pipe house entrance 2, a sprocket is fixed to one end of the shaft, a chain 8 hanging down is engaged with the sprocket, and guide members where the sash bars 5 are slidably engaged are vertically disposed on both sides of the entrance 2 of the pipe house.
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