| 摘要 |
A step ladder assembly has three legs (1, 5, 6) which are pivotably mounted at their upper ends, and which are associated with stop means (8) to define a limit of outward pivoting for the legs. One of the legs (1) has steps (2) mounted thereon. A wedging member (9) is movable upwards between the legs (1, 5, 6) to urge them outwardly against the stop means (8) thereby to define, with the stop means (8), predetermined pivotal positions of the legs (1, 5, 6). The wedging member (9) is coupled to a support rod (10) which is movable up and down with the wedging member (9) and which provides, in an upwards position of the wedging member (9), a support above a working platform (7) of the assembly. The stop means (8) is provided at least partly by edges of rigid sheet material forming the working platform (7) of the assembly, the edges being lower inner edges of the rigid sheet material after it has been folded-under along a rim of the working platform (7). One of the legs (1) is fitted at its lower end with an angularly rotationally adjustable bifurcation providing two feet for the leg. |
