| 摘要 |
<p>The pedal crank (2) is connected to a switch lever (3) enclosing an angle of 70 deg.. The drive chain (5) is fastened at one end to the oscillating lever, and the other end is connected to a sprocket (12) via a tension spring (13). This arrangement needs less force to transmit the torque from pedal to drive wheel, and the encapsulated oscillating mechanism is protected against dirt.</p> |
