| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a tread attaching structure of dog-leg spiral stairs, capable of efficiently and accurately attaching two corner part treads including an L-shaped notch at an inner side end to the dog-leg spiral stairs using three inner spiral side plates. <P>SOLUTION: For an engaging groove 11a with which an L-shaped notch 52a of a lower stage corner part tread 52 in a first inner spiral side plate 11 is engaged, a part on the side of a downward stair part 50b is turned to a through-groove part 11a' passing through the front and back of the first inner spiral side plate 11. In the state of putting one inner side end face 52a' of the L-shaped notch 52a of the lower stage corner part tread 52 along the engaging groove 11a of a lower stage and locking the L-shaped notch 52a, while inserting the proximal end part of the other inner side end face 52a" of the L-shaped notch 52a of the lower stage corner part tread 52 to the through-groove part 11a', the first inner spiral side plate 11 can be slid and moved along a side face 51a on the side of a dog-leg intermediate art 50a of a support column 51 in the range of the length of the through-groove part 11a'. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
