| 摘要 |
PROBLEM TO BE SOLVED: To enable traveling with a power saving kick pressure by responding the crank performance to the requests of strong legs to the acceleration and the number of rotation in the hill climbing as the gear ratio comes close to the maximum or minimum, though the condition response at traveling is done by the operation of the combination of the gear ratio of the large and small sprocket of 3 to 24 steps mounted exclusively to rear wheel axle and the chain ring as a transmission device in the conventional technique in the crank of the primary input device of bicycle traveling. SOLUTION: The crank is mounted to the side of the rotating main shaft and detours the crank arm fore and aft to extend the distance between the rotating main shaft and the pedal shaft. The crank arm in between is bent at the middle point to the rear side of the rotation by 90 degrees, the corner angle is reinforced and intersected with the standard circulation track arcuately curved. The design is made as swan type crank from the shape. COPYRIGHT: (C)2004,JPO&NCIPI
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