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We guarantee the ladder function remain the same,and design again for the ladder on the basis of the original. We have the ladder reasonably divided into several sections,and each section ACTS as a module, which is connected with the chain,with the method of superposition of fixed between modules and modules,which can make it in a normal free conversion between the ladder and rope ladder, and expand its length to the greatest extent.When fire or other accidents happen in the top levels, persons are trapped and can't go out, they can use the ladder to get to the floor below and escape.
Xiaowei Wu，Caixiang Ding，Rufeng Dai，Ziyun Yan，Dunqi Lu，Wenjie Zhang，Dawei Pan，Huanghao Jin，Qionglei Zhu