| 摘要 |
A pedal lever type bicycle includes a pedal lever having a front portion and a rear portion, with an intermediate pivot point located substantially above the center of the rear wheel, and to the rear of the front of the rear wheel. The rear portion of the pedal lever has a dog-leg configuration, with the slider, which is attached to the drive chain, being mounted on a straight section of the rear portion of the pedal lever which extends slightly above and to the rear of the rear wheel hub, so that the chain exerts a force to move the slider outwardly on the rear portion of the pedal lever when it is in the lower position, and in the opposite direction with it is raised. Changes of mechanical advantage of 3 or 4 to 1 are available with this configuration of the pedal lever. Further, the rear brake is mounted on the lower rear portion of the frame, to avoid interference with the pedal lever.
|
