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    Automatic shift control for bicycles and the like
    3.
    发明授权
    Automatic shift control for bicycles and the like 失效
    用于自行车等的自动变速控制

    公开(公告)号：US3929025A

    公开(公告)日：1975-12-30

    申请号：US53250974

    申请日：1974-12-13

    申请人： PERRY ROBERT E

    发明人： PERRY ROBERT E

    IPC分类号： B62M9/123 ,  B62M9/1246 ,  B62M9/1346 ,  B62M9/16 ,  F16H9/00 ,  F16H11/06

    CPC分类号： B62M9/16 ,  B62M9/123

    摘要： An automatic shift control for a vehicle, such as a bicycle, of the type including a frame, at least one wheel, a crank, a chain interconnecting the wheel and the crank, and means for changing the rotation ratio between the wheel and the crank. The automatic shift control operates the ratio changing means by sensing changes in chain tension which result from variations in pedal pressure used to propel the bicycle and includes a control arm mounted for rotation around a fixed point on the frame, the arm being positionable in any one of multiple positions; means interconnecting the control arm and the ratio changing means for selecting one of multiple ratios depending upon the position of the control arm; a chain-engaging idler wheel mounted on the control arm, chain tension tending to cause rotation of the control arm in one direction; and a tension spring connected to the control arm for applying a force thereto tending to cause rotation thereof in an opposite direction. The control arm is in equilibrium for a selected chain tension in all of the multiple positions of the control arm and only a difference between actual chain tension and the selected chain tension causes rotation of the control arm in a direction to eliminate such difference. The control arm senses the above difference at a point in the pedaling cycle where the selected chain tension is consistent and the control arm is limited to moving one position for each rotation of the pedals.

    摘要翻译： 一种用于诸如自行车的车辆的自动变速控制，其包括框架，至少一个车轮，曲柄，互连车轮和曲柄的链条，以及用于改变车轮和曲柄之间的转动比的装置 。 自动变速控制通过感测由于用于推进自行车的踏板压力的变化而产生的链条张力的变化来操作比率改变装置，并且包括安装成围绕框架上的固定点旋转的控制臂，臂可定位在任何一个 的多个职位; 用于将所述控制臂和所述比例改变装置相互连接，用于根据所述控制臂的位置来选择多个比率之一; 安装在控制臂上的链接的惰轮，链张力倾向于使控制臂在一个方向上旋转; 以及连接到控制臂的张力弹簧，用于施加力，倾向于使其沿相反的方向旋转。 控制臂在控制臂的所有多个位置中对于所选择的链张力处于平衡状态，并且只有实际的链条张力与所选择的链条张力之间的差异导致控制臂在消除这种差异的方向上旋转。 控制臂在蹬踏循环中的一个点处感测到上述差异，其中所选择的链条张力一致，并且控制臂被限制为对于踏板的每次旋转移动一个位置。