发明名称 Portable escape ladder
摘要 A portable escape ladder comprises a bracket for gripping over a building window ledge, a pair of chains suspended from the bracket and supporting a series of spaced transverse rungs therebetween and optional stand-off devices attached at least to some of the rungs to hold the ladder a fixed distance from the building wall. There is provided a form of connection between the rungs and the chains in which the ends of the rungs are pressed flat and formed with an opening in which the junction of a pair of chain links is captively held. The optional stand-off devices comprise substantially flat frames with upright extensions fitting in bores formed in the respective rungs and fastened in place by snap nuts on the ends of the uprights.
申请公布号 US4143741(A) 申请公布日期 1979.03.13
申请号 US19770865984 申请日期 1977.12.30
申请人 WOODSTREAM CORPORATION 发明人 SOUZA, ANTHONY J.;ASKINS, WILLIAM E.
分类号 E06C1/56;E06C9/14;(IPC1-7):E06C1/36 主分类号 E06C1/56
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