| 摘要 |
An adjustable crank mechanism comprises a sun gear rigidly attached to a main frame of the device and the sun gear meshed with an adjacent planetary gear of half diameter. A planetary crank arm rigidly projecting from the planetary gear generates an alternative movement of a corresponding linkage arm. A drive member constituted by a planetary crank arm jointed with a planet gear and a linkage arm jointed to the sliding pedal crank on a crank assembly makes the pedal crank extend to the maximum and return to the minimum rotating distance at each halves of cycle. Thus, the pedal on this pedal crank mechanism will move on a Gemini pedal trace to simulate the foot trace of human running or walking.
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