| 摘要 |
PROBLEM TO BE SOLVED: To provide an airtight device, in which the front end of a locking bar is not damaged even when the front end collides with an airtight material in the case of the closing of a folding door, in the airtight device preventing an opening between an upper frame and the folding door when the folding door is fitted and installed to a frame body. SOLUTION: A rotating arm 22, on which an airtight material 21 is mounted, is supported pivotally to an upper frame, a pin 32 pushing up the weight 24 of the rotating arm 22 is fitted at the upper end of a folding door, a bendable fin 26 is formed to the airtight material 21, a projection 29 is formed at the front end of the rotating arm, and the front end of the fin 26 can be pressed by the projection 29 in the case of closing.
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