Semi-rigid pedal and crank mechanism for cycles

摘要

A bottom bracket for bicycles comprises a crank (1) rigidly secured to at least two stops (2) each driving at least one elastic member (3) in rotation which in turn drive one or more chainwheels (4, 5) freely rotating on the bottom bracket spindle (11) via at least two arms (41). The semi-rigid bottom bracket according to the invention is intended specifically for use on a bicycle.