| 摘要 |
PROBLEM TO BE SOLVED: To prevent the exposure of a gap occurring between muntins 3 of a shutter main body 1 so as to store the shutter main body by making it as a single expansion type in the cross direction of opening. SOLUTION: The shutter main body 1 put on a guide rail 10 having an L- shaped plane in an upper hanging state is so constituted that independently opening and shutting expansion unit bodies 2 are connected with hinges 5 to make it possible to store the shutter main body in a storage section 11 crossing with the opening, at the same time, a gap cover 32 curved to one of the muntins 3 is projected to the other of them connected with the hinges 5, and when the shutter is expanded, the gap formed in a V-shaped groove occurring between the muntins 3 caused by the constitution is prevented from being exposed.
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