| 摘要 |
In the hub shell of a bicycle or the like a gear shifting mechanism mounted to be axially moveable is such that when the pedal is reversely rotated it is transferred in the axial direction and expands the brake shoes to forcibly press the same against the inner walls of the hub shell, thereby braking the rotation of the bicycle wheel. Thus by transferring the gear shifting mechanism for the braking purpose, it is possible at any time when necessary to secure the most reliable braking effect, in whatever speed changing condition the gear shifting mechanism may be or even if any parts thereof are damaged and even if the wire rope thereof has been extended in protracted use. |
