| 摘要 |
PURPOSE: An assembly stairway is intended to provide the horizontal section of the upward and downward joints of a stairway unit in a non-circular shape not to make relative rotation. CONSTITUTION: An assembly stairway comprises a stairway unit, a bolt, and a foot rest. The stairway unit is formed as a plurality of stages by interlocking an upward joint and a downward joint. The upward and downward joints are installed to be protruded perpendicularly to the base and leading end of a horizontal plate. The horizontal sections of the upper and lower joints are formed in a non-circular shape not to make relative rotation. A bolt is coupled to the nut portion of the downward joint from the vertical hole of the upward joint to tighten the upward and downward joints. |
