| 摘要 |
PROBLEM TO BE SOLVED: To secure smoothly raising and lowering of a shutter curtain without damaging a guide rail and avoiding an excessive increase in the diameter of the roll during winding in a structure for preventing the falling off of the curtain of building shutter which is compared so as to guide to raise or lower the curtain being a plurality of slats continuously sewed through interlock portions by guide rails erected at the right and left. SOLUTION: Projected stripes are formed in a vertical direction at the indoor side of an interior wall face of a guide rail, and locking recess portions located on the same vertical line and locked to the projected stripes are formed at the indoor side both ends of the interlock portions of each slat constituting the shutter curtain.
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