PROBLEM TO BE SOLVED: To provide a bicycle drive device by straight pedaling that has a simple structure, lightweight and high reliability.SOLUTION: In a bicycle straight pedaling crank, a main crank (1) and a sub-crank (2) have the same length and are connected by a rotation shaft (7); a sprocket B (4) is attached to the sub-crank (2) by the rotation shaft (7); a sprocket A (3) having twice as many teeth as the sprocket B (4) is fixed to a hanger pipe (11) of a bicycle frame; and both sprockets are connected by a chain (5). In this mechanism, a pedal (15) reciprocates along a straight line that passes through a crankshaft.SELECTED DRAWING: Figure 2

    【課題】 構造がシンプルで軽くかつ信頼性の高い、ストレートペダリングによる自転車用駆動装置を提供する。【解決手段】 長さの同じメインクランク(1)とサブクランク(2)を回転軸(7)で結合し、スプロケットB(4)を回転軸(7)によりサブクランク(2)に取り付ける。スプロケットB(4)の2倍の歯数を持つスプロケットA(3)を、自転車フレームのハンガーパイプ(11)に固定し、両スプロケットをチェーン(5)で結ぶ。この機構で、ペダル(15)はクランク軸を通る直線上を往復運動する。【選択図】図2


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    Title :

    BICYCLE STRAIGHT PEDALING CRANK


    Additional title:

    自転車のストレートペダリング・クランク


    Contributors:

    Publication date :

    2017-11-24


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B62M RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES , Antrieb von Radfahrzeugen oder Schlitten durch den Fahrer



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