CRANK SHAFT VARYING APPARATUS FOR DRIVE OF BICYCLE

摘要

PURPOSE: A crank shaft varying apparatus for the drive of bicycle is provided to be used with compatibility by installing a driving apparatus conveniently and easily on a bicycle manufactured previously. CONSTITUTION: The crank shaft comprises:a first crank rod(11) having a fixation hole(12) formed to fix a drive shaft(2); a second crank rod(13) installed in parallel and crosswise with the first crank rod while installing a pedal shaft(16) on the bottom to rotate, and fixed by being interlocked by serration to connect and fix a pedal(17) by both sides of the pedal shaft and an eccentric cam(18) without being rotated; and a couple of links(14a)(14b) fixed by a shaft pin(15) to make the two crank rods to be folded simultaneously.