| 摘要 |
PROBLEM TO BE SOLVED: To provide a leading roller ring to solve a problem of a conventional bicycle causing physical exhausting and tiring movement. SOLUTION: A bottom bracket 1 rotates by turning a crank, and a wire 6 symmetrically connected to directional springs 5 pulls the directional springs 5 for rotation. It is easy to pedal the bicycle so that a small pulley rotates a large pulley. The bottom bracket is formed in a keyway shape to attach a stopper thereon to work the spring for a half rotation. COPYRIGHT: (C)2011,JPO&INPIT
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