Crank drive, particularly hand or pedal crank drive for bicycle, drive shaft of traction mechanism gear is fastened to fixed crank arm and pedal is arranged at its free end
摘要
<p>The crank drive a drive shaft (3) of a traction mechanism gear (2) is fastened to a fixed crank arm (5) and a pedal (6) is arranged at its free end. The crank arm length is adjusted continuously. The crank arm length is adjusted mechanically in operation. The crank arm has a threaded spindle.</p>
