BICYCLE DRIVE Russian patent published in 1998 - IPC

FIELD: transport engineering; sports, road, tourist and freight bicycles. SUBSTANCE: bicycle drive has pedals, pedal arms, each provided with pawl and installed for turning on shaft at upward and downward movement. It has ratchet wheels, each being rigidly installed on shaft for coupling with corresponding pedal arm. Ratchet wheel is coupled through gear, intermediate shaft and train with driving wheel. Bicycle drive is furnished also with springs. Each spring is coupled with corresponding pedal arm and it can expand when pedal arm is moved downwards to bottom dead center. Force is transmitted to one of ratchet wheels by bringing the pawl in engagement with ratchet wheel when spring is compressed. Train has driving sprocket installed on intermediate shaft arranged between axle and driven sprocket coupled by chain with driving sprocket. EFFECT: facilitated pedalling, increased riding speed. 2 dwg