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US 5,755,635 AGranted
Crank device for the transmission of energy with elimination of dead centers, particularly suited for bicycles and the like
AssigneeDraco
InventorDomenico Scaramozzino
Life of this patent
Estimating the term…
Abstract
The pedal cranks (32, 34) on the propulsion group of a bicycle or similar rotate independently with respect to one another around axis (a), which is parallel and spaced at a distance (d) from axis (b) of a chain drive sprocket wheel (28). Each pedal crank is constrained to rotate together with the sprocket wheel but is free to travel over the same. An adjustment for the position of the sprocket wheel, around the axis of the pedal cranks, is provided for.
Claims8
A crank device for transmission of energy, including:
- a drive wheel rotatable around a wheel axis;
- a pair of cranks rotatable around a crank axis which is not coincident with the wheel axis;
- a support containing said crank axis, each of said cranks being free to rotate with respect to the other around said crank axis, one of said cranks being integral with an auxiliary crank extending on the same side as the other crank, said auxiliary crank and said other crank being slidable over said wheel;
- means for engaging said drive wheel and said cranks to rotate said drive wheel around said wheel axis when said cranks are rotated around the crank axis;
- and
- a disc member defining said wheel axis, said drive wheel being rotatable on said disc member, said disc member being mounted on said support.
3 more elements
Dependencies are inferred from the claim text.