BICYCLE WITH ERGONOMIC FIT AND PEDALLING Russian patent published in 2020 - IPC B62K3/00 B62M9/04 

FIELD: machine building.

SUBSTANCE: invention relates to machine building, particularly, to bicycles. Bicycle comprises triangular frame. Bicycle has ergonomic fit consisting of high rudder, seat with backrest. Bicycle is equipped with two-stage chain transmission with two tension sprockets. Driving sprocket of the first stage is connected by a chain to the driven sprocket of the intermediate shaft installed in bearings of the spacer beam of the frame. Number of teeth of drive sprocket is more than number of teeth of driven sprocket in two times. On the other end of the intermediate shaft the driving eccentric sprocket of the second stage is rigidly fixed, which is connected by a chain to the driven sprocket of the drive rear wheel equipped with a free running clutch. To pull the lower branch of the chain of the second stage below the axis of rotation of the rear wheel there is a hinged lever with a tension sprocket and a spring at the end. To prevent displacement of bicycles in lateral sides seat is equipped with two rubberized and length-adjustable couplers.

EFFECT: reduced cyclist fatigue during prolonged driving.

1 cl, 7 dwg