| 摘要 |
<p>A crank mechanism for a bicycle includes a crank axle (8), a crank arm (5) rotatable with the crank axle (8), a pedal shaft (6) attached to the crank arm, and a pedal (7) rotatably supported by the pedal shaft (6). The pedal (7) is also movable to and fro relative to and in directions perpendicular to the pedal shaft (6). <IMAGE></p> |
