Abstract

In order to form a largely oval circulatory path, in particular a pedal (1a), a crank drive (1) is described which periodically changes the effective lever length of a crank (2). In this case, gear levers (4' or 7) are mounted on a crank (2) at both ends (2 a, 2b) which rotate in opposite directions with respect to one another and thus form two further movement axes within the pedal path and are thus adapted to the natural human leg movement in a force-saving and ergonomic manner.

IPC Classes  ?

• B62M 3/06 - Construction of cranks operated by hand or foot with elliptical or other non-circular rotary movement
• B62M 3/04 - Construction of cranks operated by hand or foot of adjustable length automatically adjusting