FIELD: machine building.
SUBSTANCE: invention relates to production of bicycles. In compliance with first version, bicycle gearshift mechanism comprises gearshift device, guide and tensioner. Gearshift device is made in the form of a bracket, in the lower part of which a rod is fixed parallel to the axis of the rear wheel, which is directed inside the frame. Lock ring and a fork with a roller are installed on the free edge of the rod. On the bracket rod there is a movable bushing, which is enclosed by a rotary ring. Disk spiral spring with outer larger diameter is attached to the bracket at two points, while its inner small diameter is attached to the movable bushing. Frame with guide and tension rollers of one of its tabs is attached to movable bushing. Gear cluster is installed on the rear wheel axle. According to the second version, the gearshift mechanism of the bicycle contains a bracket, in the lower part of which a rod is fixed parallel to the axis of the rear wheel. Rotary plate is installed on the free edge of the rod.
EFFECT: higher bicycle gearshift reliability.
2 cl, 6 dwg
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