| 摘要 |
PROBLEM TO BE SOLVED: To provide a power pedal capable of solving the problem that a transmission must be used for changing torque and driving force. SOLUTION: A coil spring is built in a gear crank or formed of a flexible material. Thus, the rotational torque is increased, and the acceleration and the uphill ride can be facilitated. COPYRIGHT: (C)2008,JPO&INPIT
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