Crank drive with periodic change of effective lever length
OwnerDavid Schmidtinventor
Life of this patent
Estimating the term…
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.
Claims15
A crank drive with periodic change in an effective lever length for an oval path of a pedal or an element of force-application, with at least one crank with an outer end and an inner end,
- a gear lever being arranged on the crank at both the inner end and the outer end, respectively, wherein the gear levers are comprised of three externally toothed spur gears, wherein one of the spur gears is coupled to the crank with its rotational spur gear axis, and another spur gear is non-rotatably connected with a frame or the pedal, as well as that one of the two gear levers performs an opposite self-rotation relative to a rotational direction of the crank.
A crank drive with periodic change in an effective lever length, for an oval path of a pedal or an element of force-application, with at least one crank with an outer end and an inner end and a chainwheel, wherein a gear lever is designed as a multistage gearbox with a first stage and a reversing stage, the first stage and the reversing stage both having a crank-sided spur gear, a chainwheel-sided spur gear and an intermediate spur gear between the chainwheel-sided spur gear and the crank-sided spur gear, wherein the crank-sided spur gear of the reversing stage is non-rotatably connected with the crank-sided spur gear of the first stage, and that the chainwheel-sided spur gear of the reversing stage is supported on a tubular extension of the chainwheel-sided spur gear of the first stage and is coupled to the chainwheel.
Dependencies are inferred from the claim text.