Disclosed herein is a bicycle comprising a frame, a pair of wheels supporting the frame, a sprocket fixed to one of the wheels, a drive member rotatably carried by the frame, a pair of pedals connected to the drive member, a plurality of links carried by the drive member for common rotation therewith...http://www.google.com/patents/US4164153?utm_source=gb-gplus-sharePatent US4164153 - Device for use in mechanical power transmission system
