Gimpel's set parts and assemblies for transformation of treadle lever rocking movement into rotary movement of bicycle drive shaft

A removable device for a bicycle, comprising:

• a chain mechanism connecting an axis for pedal rotation of the bicycle and an axis of a back wheel of the bicycle,
• a first and a second shaft, the first and second shafts being positioned on opposite sides of a bicycle frame,
• the first and second shafts being hingedly connected to each other on upper ends and lowers ends of each shaft,
• an upper end connection between said first and second shafts, said upper end connection comprising a reverse mechanism, said reverse mechanism moving the second shaft in an opposite direction of movement relative to the first shaft, the reverse mechanism being attached to an upper part of the bicycle frame,
• a lower end connection between said first and second shafts, said lower end connection comprising individual connections to corresponding first and second pedal levers, said pedal levers being connected to pedals of the bicycle via corresponding parts,
• the pedal levers being connected to the axis of pedal rotation of the bicycle,
• the pedal levers also being connected to corresponding shafts.