Driving mechanism for bicycle - has chain wheel with connected ring bodies to carry pedals

摘要

The mechanism has at least one chain wheel (10), connected to a shaft, and two pedals, acting with the chain wheels. The chain wheel (10) is non-turnably connected to a first ring body (16) with larger external diameter. The ring is located coaxial to the chain wheel, and carries a pedal (20). The distance between the pedal and the axis (19) of the shaft (18) is larger than the external diameter of the chain wheel. The other end of the shaft is connected to a second ring or disc, which carries the second pedal. The outer diameter of the first ring corresponds approx. to the length of a conventional crank for a bicycle. ADVANTAGE - More lightweight than conventional cranks.