Block and tackle balance with integral, non-rotating pulley system
    1.
    发明授权
    Block and tackle balance with integral, non-rotating pulley system 失效
    用整体滑轮系统阻挡和平衡

    公开(公告)号:US5737877A

    公开(公告)日:1998-04-14

    申请号:US687684

    申请日:1996-07-26

    Abstract: A block and tackle balance disposed between a jambliner and a window sash includes a spring and a non-rotating pulley system. A head block is disposed on a rod for attaching the balance to the jambliner and securing one end of the spring, and a slide block is disposed at about the midpoint of the rod for securing the other end of the spring. The slide block acts in combination with a base block and a pulley cord, to create the non-rotating pulley system. The slide block and the base block each have at least one cord-receiving channel formed in a raised u-shaped member, for slidably receiving the pulley cord. The base block further includes a bore for securing an end of the pulley cord, and is coupled via the pulley cord to a shoe, which moves in response to movement of the window sash. As the shoe moves, the cord slides within the channels, and the slide block moves toward the base block. The displacement of the slide block relative to the fixed head block, results in a change in the length of the spring such that the spring supports the new position of the window sash.

    Abstract translation: 布置在帆布板和窗扇之间的块和铲平台包括弹簧和非旋转滑轮系统。 头块设置在杆上,用于将平衡板附接到帆布板并固定弹簧的一端,并且滑块在杆的中点处设置以固定弹簧的另一端。 滑动块与基座和滑轮绳组合起来,以产生非旋转滑轮系统。 滑动块和基座各自具有形成在凸起的U形构件中的至少一个帘线容纳通道,用于可滑动地接收滑轮绳。 基座块还包括用于固定皮带轮绳索的端部的孔,并且经由皮带轮绳索耦合到鞋子,靴子响应于窗扇的移动而移动。 当鞋移动时,绳索在通道内滑动,并且滑块朝向基座移动。 滑块相对于固定头块的位移导致弹簧长度的变化,使得弹簧支撑窗框的新位置。

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