| 摘要 |
A step or rung ladder is disclosed, which can be folded together into a compact unit under transport. The step or rung ladder includes two step frame sections ( 1, 2 ) connected by lockable hinges ( 3, 3 '), and two support frame sections ( 9, 6 ) also connected by lockable hinges ( 8, 8 '). The step frame is connected to the support frame in its upper end by hinges ( 15, 15 '). A support or safety rail is connected to the upper end of the step frame, either rigidly or by a third set of lockable hinges ( 10, 10 ').
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