PEDAL-AND-CRANK SPROCKET Russian patent published in 2001 - IPC

FIELD: transport engineering; muscular- driven vehicles. SUBSTANCE: proposed sprocket has sections with driven teeth and straight sections arranged along longitudinal axis, and hole in center for fastening sprocket on bicycle. Sections with drive teeth are furnished with conical pilots designed for alignment of drive member and are made in form of arc of semicircumference, being arranged between extreme drive teeth. Straight sections have no teeth, and they are located closer to longitudinal axis than tooth spaces between extreme drive teeth on sections in form of semi-circumference. EFFECT: reduced noise in operation, enhanced manufacturability. 2 dwg