ADJUSTABLE PEDAL DRIVING DEVICE OF BICYCLE

摘要

Disclosed is an adjustable pedal driving device of bicycle which can extend, upon running, a distance between a pedal shaft of a chain sprocket, which transmits a rotating force of pedals to a rear wheel, and pedals, to thereby obtain a maximum running energy at the expense of a minimum driving energy consumption. The adjustable pedal driving device includes: a frame in which a chain sprocket on the inside of both flanges thereof is shaft-coupled on a pedal shaft; a rotary body rotary-coupled as a unitary body with the flanges; a rotary disc rotary-coupled as a unitary body with the rotary body and eccentric shaft-coupled with the pedal shaft; first and second guide pipes sliding-coupled on first and second operation bars coupled on the both ends of the pedal shaft and fixed by means of a shaft pin on the rotary body to thereby adjust the distance between the pedal shaft and pedals upon the rotary driving of the pedal shaft for running; and an adjusting part installed between the rotary disc and the frame, for fixing the rotary disc on the frame and adjusting the rotary disc at an arbitrary angle, centering around the pedal shaft.