Abstract: A bicycle equipped with two, oscillatingly mounted on a joint axis (1), rear-facing levers (2) with pedals (3) and a rotary-return mechanism comprising a hub (9), bearing-placed on an axis (8), on which fixed are two freewheels (6) cooperating with levers (2) and a third chainwheel (10) transmitting the drive through the chain (13) and sprocket (14) onto the bicycle's drive wheel (15). To each of the levers (2) attached is rotatively on an axis (5) one end of one of the two chains (7) which connect these levers (2) with one of the two freewheels (6), and the other ends of these chains (7) are mutually joined with a chain (11) run on a reversible chainwheel (12). The lever (2) together with a part of the chain (7) in the upper extreme position of the pedal (3) is tangent to one of the two freewheels (6), and the second lever (2) in the bottom extreme position of the second pedal (3) is in a near-vertical position.

Abstract: A bicycle equipped with two, oscillatingly mounted on a joint axis (1), rear-facing levers (2) with pedals (3) and a rotary-return mechanism comprising a hub (9), bearing-placed on an axis (8), on which fixed are two freewheels (6) cooperating with levers (2) and a third chainwheel (10) transmitting the drive through the chain (13) and sprocket (14) onto the bicycle's drive wheel (15). To each of the levers (2) attached is rotatively on an axis (5) one end of one of the two chains (7) which connect these levers (2) with one of the two freewheels (6), and the other ends of these chains (7) are mutually joined with a chain (11) run on a reversible chainwheel (12). The lever (2) together with a part of the chain (7) in the upper extreme position of the pedal (3) is tangent to one of the two freewheels (6), and the second lever (2) in the bottom extreme position of the second pedal (3) is in a near-vertical position.