| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide spiral stairs having a light-weight structure and capable of giving light impression and achieving high efficiency of production and construction. <P>SOLUTION: On these spiral stairs provided with a central support column 10 erected in the vertical direction and a plurality of treads 20 arranged spirally around the central support column 10, the tread 20 is supported on a supporting member 30 overhanging from the central support column 10, the supporting member 30 is provided with a frame member 31 overhanging from the central support column 10 and outer peripheral nodal point members 33, 34 connected with a tip of the frame member 31, insertion holes are formed on the outer peripheral nodal point members 33, 34 along the vertical direction, and the supporting members 30, 30 being adjacent to each other in the direction of height are mutually connected by utilizing the insertion holes. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
