| 摘要 |
PURPOSE:To strengthen the rigidity of the supporting structure of a stair and suppress the cost increase. CONSTITUTION:Each of tread fixing tools 3 of a stair fixing the treads F1, F2, F3 to bridge boards (stair frames) 2a is integrally formed with a fitting section 4 fitted with one tread, e.g. F1, and a riser section 5 shielding the gap between one tread F1 and another tread F2 located below one tread F1 by one step. Both end sections of the riser section 5 are fixed to the bridge boards 2a. |
