| 摘要 |
The length of the telescopic crank varies as a function of its position in the pedaling cycle to optimise the transmitted torque. There is a sliding guide (2,3) and a servo based on the incompressibility of fluids. When the casing (1) integral with the chain wheel plates rotates around the fixed cam (7), the liquid held by paddles (6) activates the rod (5) fixed to the pedal.
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