Crank device for use in bicycle, has control arm lying against supporting point on control disk, where supporting point is shifted transverse to longitudinal extension of crank arm to counteract torsion of crank arm

摘要

The device (10) has a crank arm (16) exhibiting arm elements (22, 24) along a longitudinal extension (20), where elements are shifted relative to each other, such that a lever length (30) of the crank arm is changed. A cooperation of a control disk (18) and control element is formed to change the lever length, during a rotation of the crank arm. The control arm lies against a supporting point on the control disk. The supporting point is shifted transverse to the longitudinal extension of the crank arm to counteract torsion of the crank arm.