| 摘要 |
Markovic lca STEP LADDER FOR STAIRS A step ladder for stairs has a rear support member for providing a climbing structure, a front support member for retaining the rear support member in a substantially erect position, the front support member being hinged connected to the rear support member and including an upper portion with a bottom end and a lower portion, and a hinge assembly for hinged connecting the upper and lower portions together. The hinge assembly permits folding of the front support member so that the bottom end of the upper portion can rest on a first surface which is raised above a second surface whereupon the rear support member rests. The hinge assembly may have a first locking assembly to secure the upper and lower portions in an unfolded position and a second locking assembly to secure the upper and lower portions in a folded position. |
