| 摘要 |
PROBLEM TO BE SOLVED: To provide a simple structure that prevents generation of fricative sounds caused by a decorated side board even when a tread board trembles. SOLUTION: A metal tread board bed member 3 fixed onto a metal side girder 2 locate on the outer side of the wall 1 and a wood tread board 4 is fixed onto the tread board bed member 3. The bottom part of a wood decorated side board 5 is adhered to the end side part of the tread board 4. A horizontal piece 8 of the strip member 7 of which cross section has an inverted L shape, is fixed on top of a sash bar 6 that supports the strip member fixed onto the wall 1. The width of a clearance 10 fore slidable insertion to be formed between a vertical piece 9 of the strip member 7 of which cross section has inverted L shape and the outside face of the sash bar 6 that supports the strip member will be slightly wider than the width of the top end part of the decorated side board 5. The top end part of the decorated side board 5 is slidably inserted into the clearance 10.
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