A starter device for an internal combustion engine which includes a starter motor, a pinion shaft rotated by the starter motor, a movable cylindrical member fitted on the pinion shaft and coupled thereto by a helical spline coupling, a pinion gear fitted for free rotation on the pinion shaft, a unidirectional...http://www.google.es/patents/US4325265?utm_source=gb-gplus-sharePatente US4325265 - Starter device for internal combustion engine
