| 摘要 |
PURPOSE: To return an end part of a shutter curtain slipping out of a guide rail when a load exceeding a predetermined value acts on the shutter curtain into the guide rail easily. CONSTITUTION: In a sheet shutter in which a guide block 13 slips out of a guide rail 5 when a load exceeding a predetermined value acts on a shutter curtain 4, the guide block 13 is provided with a rear part facing the direction in which it leaves an opening part of a building, the rear part extends in the vertical direction and has a tapered protruding cross sectional shape, and the guide block 13 is pressed into the guide rail 5 through the rear part when the guide block 13 comes off the guide rail 5.
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