The novelty of the design lies in the fact that the principle of air damping is used to convert the potential energy people and things release in gravitational field when dropping into kinetic energy of spiral leaf and to be consumed by air resistance, thus limiting the speed of falling within a reasonable limit to a safe landing. The designed cam and linkage mechanisms are then used to achieve variable transmission ratio, so that gear pair of the different speed ratio work, changing the target rate of falling. This device, which is especially suitable for people of different weight, is safe and reliable. It can be used on high-rise buildings when a fire occures.%采用空气阻尼原理,将人、物在重力场内下降时释放出的位能转变螺旋叶的动能,被空气阻力所消耗,限制落地速度在合理范围之内从而安全落地.再利用设计出的凸轮和连杆机构实现变传动比,使不同传动比的齿轮副工作,改变人下降速度,尤其适用于不同体重的人逃生.安全可靠、可连续重复使用,可用于高层、超高层建筑发生灾害时集体自救逃生.
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