| 摘要 |
PURPOSE:To construct a staircase free from the generation of swing by fitting the upward joint body of a lower stage side unit onto the downward joint body of an upper stage side unit and allowing one between the upper stage side unit and the lower stage side unit to vertically move and turn. CONSTITUTION:The upward joint body 2 of a lower stage side unit is fitted from an undersurface opened port part onto the downward joint body 3 of an upper stage side unit. The arrangement angle is adjusted by the vertical movement and turn in a horizontal plane of a lower stage side unit 7 around the downward joint body 3 of the unit on the upper stage side. Then, a lock bolt 11 is screwed into the screw hole 4 of the upward joint body 2 of the lower stage side unit, and tightened onto the downward joint body 3 of the upper stage side unit. Then, a lock bolt 12 is screwed into the screw hole 5 of the downward joint body 3 of the upper stage side unit, and tightened onto the outer wall surface of the upward joint body 2 of the lower stage side unit. Therefore, a staircase free from the distortion due to load can be constructed. |
