| 摘要 |
A preassembled platform stairway for installation between an upper floor and an adjacent lower floor. The stairway includes a bulkhead, an upper run of stairs, a lower run of stairs, and a landing. The top of the upper run of stairs is pivotally connected to the bulkhead, the bottom of the upper run of stairs is pivotally connected to the landing and the top of the lower run of stairs is pivotally connected to the landing side-by-side with the upper run of stairs. The pivotal connections permit the stairway to collapse in a compact configuration for transport and storage. The stairway may be lifted and then lowered into place for installation. When lifted, the stairway assumes an expanded position with the runs of stairs extending angularly from the landing and bulkhead, and hangers suspend the landing below the bulkhead.
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