Abstract: A device for bicycles or other pedal-powered vehicles is fitted with at least one crank that has a pedal at one end and a crank box on the other. The crank box is fitted with a flute and contiguous to a fixed structure fitted with a pin. The movement of the crank is limited by the pin's movement in the flute. The crank box has a torsion spring nested within it. The device is fitted with a braking mechanism of the crankshaft's sprockets, in that these sprockets engage with sprockets of a transmission box, connecting the transmission box to the toothed shaft's box. The sprockets of the transmission box, in turn, transmit their movement to the outer shaft.

Abstract: The present invention concerns a device (1) for bicycles or other pedal-powered vehicles, fitted with at least one crank (3) that has a pedal at one end (2) and a box on the other (4), with said box (4) being fitted with a flute and contiguous to a fixed structure fitted with a pin, characterized in that the movement of the crank is limited by the pin's movement in said flute, in that the box (4) nests a torsion spring within it, in that the device is fitted with a braking mechanism of the crankshaft's (24) sprockets, in that these sprockets (24) engage in the sprockets of the transmission box, connecting this box to the toothed shaft's box (63) and in that the sprockets of the transmission box, in turn, transmit their movement to the outer shaft.