Mechanical transmission device for bicycle, has lever arm equipped with rotating roller placed at its end and moveable slider that is moved and positioned on arm by drive cable actuated by cyclist

摘要

The device has a cam (2) fixed on a pedal actuating a lever arm (3) that is articulated on a frame of a bicycle. The cam includes two lobes that are pushed back twice by turning of the lever arm which is equipped with a rotating roller (4) placed at its end. The lever arm includes a moveable slider (5) that slides on the lever arm and is moved and positioned on the arm by a drive cable (6) that is actuated by a cyclist.