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    Stepladder
    4.
    发明授权
    Stepladder 有权

    公开(公告)号：US09689204B2

    公开(公告)日：2017-06-27

    申请号：US14424113

    申请日：2014-01-29

    申请人： Tokuo Aoi ,  Tazuko Aoi

    发明人： Tokuo Aoi ,  Tazuko Aoi

    IPC分类号： E06C1/18 ,  E06C1/20 ,  E06C1/22 ,  E06C7/44

    CPC分类号： E06C1/20 ,  E06C1/18 ,  E06C1/22 ,  E06C7/44

    摘要： A stepladder provided with a coupling frame in the shape of an equilateral triangle, a front support, a rear right support, a rear left support, and spread stoppers for stopping the front support, the rear right support, and the rear left support from spreading. The front support is rotationally attached to a front shaft of the coupling frame, the rear right fixing member is rotationally attached to a right shaft, and the rear left fixing member is rotationally attached to a left shaft. The rear left support and the rear right support are detachably mounted to the rear left fixing member and the rear right fixing member, respectively. The supports of the stepladder are coupled by the spread stoppers, whereby the three supports are restricted from being displaced forward, to the right rear, and to the left rear.