| 摘要 |
Tiered seating is constructed from two supports (10,11) which are stably supported on the ground. Each support comprises at its upper end , two parallel cylindrical guide pins which project vertically. Seats (13) have holes at their side ends. The guide pins and the holes have dimensions such that the end of each floor can be engaged by its holes on the guide pins and also allow their pivoting on the pin. Supports of a given height form the tier (2) of the first row. Second supports (11) of greater height and panels (12), which can be fixed on these supports, having cylindrical guide pins form the second (3) and third (4) tiers.
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