| 摘要 |
PROBLEM TO BE SOLVED: To prevent a lifting cord loosely inserted in a guide ring of the top from unintentionally falling out of the guide ring, and disengage the lifting cord from the guide ring when a load acts on the lifting cord loosely inserted to the guide ring other than the guide ring of the top.SOLUTION: A fitting ring part 21 of a guide ring 20 is fitted in multiple loop rings 11b mounted to a shielding material 11, and a lifting cord 13 is loosely inserted to a loosely inserted ring part 22 integral with the fitting ring part. The loosely inserted ring part has an inner ring part 23 adjacent to the fitting ring part and an outer ring part 24 adjacent to the inner ring part. The lifting cord is loosely inserted in the inner ring part of the guide ring fitted to the loop ring of the top of the shielding material, and the lifting cord is loosely inserted in the outer ring part of the guide ring fitted to the loop ring other than the loop ring of the top. A cord disconnection mechanism 26 capable of disengaging the lifting cord from the outer ring part is provided in the outer ring part.SELECTED DRAWING: Figure 1 |
