| 摘要 |
<p>A pedal mechanism (4) for a bicycle comprises a pair of elongate members (5) attachable to the frame (1) of a bicycle on opposite sides thereof. A respective pedal (9) is associated with each of the elongate members and is mounted for reciprocation relative to the frame. A hub/scroll mechanism (6) is associated with a wheel (3) of the bicycle, and a pair of wires (10 are provided. The hub/scroll mechanism (6) comprises a wheel hub (16), a pair of scrolls (7) and a pair of one-way clutches (17), each scroll being associated with a respective elongate member/pedal carrier (5, 8). Each scroll (7) has a curved perimeter, and the scrolls are rotatably mounted on a scroll shaft (14) in such a manner that the radius of curvature of the curved perimeter of each scroll with respect to the axis of the scroll shaft is a minimum at one end (7c) of that curved perimeter and a maximum at the other end (7b) of that curved perimeter. One end of each wire (10) is associated with a respective elongate member (5), the other end of that wire being connected to a respective scroll (7) adjacent to said one end (7c) of that scroll, and an intermediate portion of that wire passes around the curved perimeter of that scroll. A respective one-way clutch (17) is provided between each scroll (7) and the hub ( 16), so that rotation of that scroll in one direction rotates the hub, and rotation of that scroll in the other direction results in that one-way clutch freewheeling</p> |
