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    • 1. 发明授权
    • Ladder and method of construction therefor
    • 梯子及其施工方法
    • US4177879A
    • 1979-12-11
    • US818590
    • 1977-07-25
    • William H. Frank
    • William H. Frank
    • E06C7/08E06C7/50
    • E06C7/087
    • A ladder with elongated side rails each with a web with two broad surfaces, and rungs supported by and extending between the webs of the side rails at spaced locations, has rung brackets molded into and embracing the webs, each of the rung brackets having a rung receiving boss and a base part on one broad surface of the web and a pad part on the other broad surface, and tying members, integral with the base and pad parts, connecting the parts and extending into the web. In making the ladder, holes are formed in the webs at the rung locations and the rung brackets are molded in place in and through those holes.
    • 具有细长侧轨的梯子,每个梯子具有带有两个宽表面的腹板,并且在间隔位置处由侧轨的腹板支撑和延伸的梯级具有模制成并包围腹板的梯形支架,每个梯架支架具有梯级 接收凸台和基部部分在幅材的一个宽表面上以及在另一宽表面上的垫部分,以及与基部和垫部分成一体的捆扎部件,连接部件并延伸到卷材中。 在制作梯子时,在梯级位置处的腹板中形成孔,并且将梯形支架模制在该孔中并通过这些孔。