A variable speed transmission transmits power between an input and output in which a pinion gear, a rotor and a cam are mounted for relative rotation therebetween. First and second gear rack pairs have opposite facing toothed gear racks which are spaced apart sufficiently to receive the pinion gear and...http://www.google.es/patents/US5099706?utm_source=gb-gplus-sharePatente US5099706 - Variable speed transmission
