| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a novel step unit which can be attached and detached only by operation from one surface side of an elevation object.SOLUTION: A step unit 1 comprises: a bolt 10 for step which is inserted into a support hole 101 of an elevation object 100 and locked; an attitude holding washer 20 including an insertion hole; and a nut 30 which is threaded to a male screw part of the bolt for step. The bolt for step includes: a first portion 11 receiving a load; a second portion 12 spliced onto one surface 100a of the elevation object 100; a third portion 13 inserted into the support hole; and a fourth portion 14 spliced onto another surface 100b of the elevation object. The attitude holding washer includes a recess into which at least a part of the second portion is fitted when spliced onto one surface of the elevation object while inserting the first portion of the bolt for step through the insertion hole. When the nut is threaded to the male screw part of the first portion and fastened, the attitude holding washer is press-contacted and fixed onto one surface of the elevation object.</p> |
