VARIABLE MULTISPEED DRIVE FOR BICYCLE Russian patent published in 1995 - IPC

FIELD: bicycles. SUBSTANCE: drive has driving variable radius wheel, driven sprocket wrapped around by chain, chain tension adjuster installed on frame and change-speed control lever secured on handlebar Novelty in design of drive is that variable-radius driving wheel consisting of radially movable sectors with round sprockets secured on ends of sectors and wrapped around by chains and fixed to prevent rotation when pedalling by locks and movable relative to axle when changing the gears. Such an arrangement provides gear ratio within 2 and 4. Drive has also change-over disk with curvilinear slots of arc length equal to quarter of turn of driving wheel and driving wheel movable sector carriers fitted in stops and fixed by radial slots of fixing disk preventing circumferential displacement relative to slots when pedalling. Fixing disk is free to displace relative to curvilinear slots of change-over disk in process speed changing. EFFECT: enlarged operating capabilities. 5 cl, 5 dwg