| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide spiral stairs capable of easily absorbing an installation error in an outside plate. <P>SOLUTION: This invention aims at the spiral stairs installed so as to butt an end surface of a sideways turning outside plate 61a arranged in the horizontal direction against an end part inner surface of a vertically turning outside plate 51a arranged in the vertical direction among two step board support outside plates 51a and 61a mutually orthogonally arranged in a corner part. An installation recessed part 57a is arranged on the end part inner surface of the vertically turning outside plate 51a, and an installation projection part 80 corresponding to the installation recessed part 57a is arranged on an end surface of the sideways turning outside plate 61a. A width T of the installation projection part 80 is set smaller than a width W of the installation recessed part 57a. An end part of the sideways turning outside plate 61a is movably constituted in the width direction (the vertical direction) of the installation projection part 80 to the vertically turning outside plate 51a in a state of fitting the installation projection part 80 in the installation recessed part 57a. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
