| 摘要 |
A scaffold stair unit 10 comprises a plurality of substantially mutually equidistant and parallel treads 20 pivotally secured to first and second stringers 12,14 at a first side of each tread and third and fourth stringers 16, 18 attached at a second side of each tread. This permits the height of the unit to be adjusted whilst maintaining the equidistant spacing and parallelism of the treads. Preferably, the unit comprises a locking means in the form of a strap assembly 72 which extends from a stringer on a first side of the unit and includes an elongate slot, the strap engaging with a clamping device secured to the other stringer to selectively clamp the strap in a desired position, as shown in Figure 8. |
