| 摘要 |
A staircase 10 comprises a plurality of treads 12, and strings 14. The treads 12 extend between the strings 14 to form a stairway. Each tread 12 is attached to the strings 14 by pivotal arrangements providing a pivot axis 36. Each tread 12 can pivot relative to the strings 14 through an arc 42. This allows the staircase to be reconfigured by the treads moving between a use position in which the treads and strings together form a stairway, and a stowed position, in which the treads are parallel with the strings. The pivotal attachment arrangements also allow the staircase to be installed with a range of different pitches for the stairway. The strings may be in two parts (14a 14b Fig. 7) and be hinged together (52 Fig. 7). A riser 22 may be provided between each tread and may be pivotally adjustable about a pivot 26. |
