| 摘要 |
A two-stage suspension assembly having a driven wheel rotatably mounted thereon, for use on cycle frame having a pedal assembly mounted thereon, the suspension assembly being pivotally mounted on the frame, there being an endless flexible driving linkage between the pedal assembly and the driven wheel, the suspension assembly comprising: a first stage resiliently linked to the main frame so as to allow a first degree of driven wheel travel whereby the driven wheel may be displaced upwardly relative to the surface it is travelling over without substantially increasing the distance between the driven wheel and the pedal assembly, and a second stage resiliently linked to the main frame and pivotally linked to the first stage so as to allow a second degree of driven wheel travel whereby the driven wheel may be displaced a further distance upwardly relative to the surface it is riding over and whereby the distance between the axis of rotation of the driven wheel and the pedal assembly may be increased wherein, in operation, when no pedalling force is applied to the pedal assembly, both the first and second stages are active, and when pedalling force is applied to the pedal assembly, the second stage is substantially inactivated due to the tension in the flexible linkage between the rear wheel and the pedal assembly.
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