| 摘要 |
<p>PROBLEM TO BE SOLVED: To propose movable tiered bleachers capable of decreasing design restriction.SOLUTION: A step floor 2 comprises a seat body 11 and a backrest 12 placed at a position in front of the seat body 11 on the step floor 2. The seat body 11 is movably supported between a lower position where the seat body 11 is along the step floor 2 and an upper position having a space upward from the step floor 2. The backrest 12 is movably supported around a rotation axis 17, which is set at a part in front of the step floor 12, between a front position and a rear position. The backrest 12 and the seat body 11 on a step floor immediately below the backrest 12 cooperate to function as a chair with the seat body 11 and the backrest 12.</p> |
