Spherical -Bar Linkage Mechanism

for sitting operators.
Input: two pedals of coaxial horizontal rotary axes (in pink and violet).
Output: vertical shaft.
The mechanism converts the input angular oscillation into the output continuous rotation.
The mechanism has two dead positions.
The output inertia helps the mechanism overcome the dead points.
Yellow disk cam and spring slider (in green) don’t allow the mechanism to stop at its dead points to ease its staring.
In case without the cam, turn the output a little when starting, if needed.
The gear system ensures opposite rotation directions of the two pedals.

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