| 摘要 |
PURPOSE:To correct malfunction of tread connection due to welding by utilizing an anti-slip instrument installed on the corner side of a footstep as a linking means for each tread. CONSTITUTION:Fitting ports 21, 22 into which one tread 1 and the other tread 1b that form a footstep can be fitted, are provided on an anti-slip instrument 2. A footstep is formed by fitting the treads 1a, 1b into the fitting ports 21, 22. Since the anti-slip instrument 2 works as a fastening tool for each tread 1a, 1b, no welding is needed to connect the treads 1a and 1b to one another. |
