Outrigger supports for ladders

作者: Reuben Wilke

DOI:

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摘要: A stabilizing safety attachment for ladders and having an elongate base channel extending across beyond lower end of the legs ladder. The web material is bent upwardly to provide flanges pivotal brace members inwardly therefrom at ladder by a threaded stud through rung device also has pair upturned retainer tabs formed from preventing lateral movement in channel.

参考文章(1)
George R. Hess, Safety support for ladders ,(1959)