| 摘要 |
PROBLEM TO BE SOLVED: To provide a shutter mechanism for a building simple in structure, hardly having trouble, smooth in action and manufactured at a low cost. SOLUTION: Two front and rear shutter bodies 15, 16 are connected by a wire 14 passing through two front and rear guide rollers 12, 13 provided at a ceiling. Both shutter bodies 15, 16 have almost the same weight. Both shutter bodies 15, 16 are synchronously moved in such a manner that when one shutter body is moved up, the other shutter body is moved down.
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