FIELD: machine building.
SUBSTANCE: invention relates to bicycles. Bicycle includes frame, in which front wheel with rudder, rear wheel with driven sprocket and con-rod drive with pedals are installed. Piston drive comprises two piston rods and drive sprocket. Con-rods are made with possibility of their length increase at creation of torque on driving sprocket at working stroke. Bicycle is equipped with piston rope length regulator. Every con-rod is made telescopic and consists of tube and rod with head for pedal attachment. Tube has a through closed longitudinal slot. Finger is fixed on rod passing through slot in tube and entering annular guide groove of appropriate jaw. Annular guide groove in each of jaws is formed by conjugated to each other arc-like section of idling for connecting rod and arched section of working stroke for connecting rod of maximum length. Convex part of working stroke for connecting rod is located at greater distance relative to axis of carriage, than arc-shaped section of idle stroke for connecting rod.
EFFECT: improved operating conditions of bicycle due to automation of change of piston length during working stroke and during idling.
4 cl, 4 dwg
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