| 摘要 |
A bicycle is provided to easily climb up a slope without gear change with little force by installing a crank rotating by 180 degrees using the leverage principle. A bicycle includes a rotational shaft(20), a wheel shaft(50), a first crank(30), a first foot plate(41), a first chain, a drive chain sprocket(90), a second crank(31), and a second foot plate(42). The first crank includes a first chain sprocket fixed to one side of the rotational shaft and a first crank bearing case provided on one side of the first chain sprocket to rotate the rotational shaft. The first foot plate includes first and second crank arms and is connected to the first crank arm by a pin. The second crank is located on one side of the drive chain sprocket and has a second crank bearing case rotating the rotational shaft. The second foot plate includes third and fourth crank arms and is connected to the third crank arm by a pin. |
