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improvement in structures extending in particular towers to work in luochi high and similar
improvement in structures extending in particular towers to work in luochi high and similar
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机译:改进了特别是塔楼的结构,以在洛池高地及类似地区工作
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摘要
A self-erecting tower structure, for example, for overhead inspection and for supporting lights, aerials, antennas, and cameras. The structure includes an extensible member comprising a number of superimposed frames and self-erecting legs interconnecting the frames and erecting means, such as endless chains or a screw-threaded column, arranged to raise each of the frames in succession through a distance at least equal to the length of the legs.
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