| 摘要 |
PROBLEM TO BE SOLVED: To provide a chainless bicycle having good rotation transmission efficiency and good riding comfort. SOLUTION: This bicycle 1 is formed to be freely traveled by journaling a center shaft 9 of a rear wheel 8 in a lower part of a saddle 31 at a rear end of a frame 2 for connecting a front wheel 6 side and the rear wheel 8 side, internally providing a gear transmission device 21 of a prescribed rotation transmission ratio in the rear wheel 8, and journaling a pedal 10 on the center shaft 9 of the rear wheel 8 so that the rear wheel 8 may be freely rotated and driven. Especially, a rear wheel supporting frame 7 is disposed on an extension to a lower side of a saddle supporting frame 4 inclined to a rear side by 10-30°, the rear wheel 8 is journaled at the lower end part, an auxiliary wheel 24 is disposed on a slightly rear side of the rear wheel 8, and a rear part of the bicycle 1 is supported. COPYRIGHT: (C)2009,JPO&INPIT
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