A toy bubble-blowing lawn mower is disclosed having a wheel driven impeller coupled to a propeller for generating a stream of air. The impeller is also intermittently coupled to a bubble disk in either direction of rotation of the impeller for successively moving apertures in the disk covered by a bubble-forming...http://www.google.fr/patents/USRE32973?utm_source=gb-gplus-shareBrevet USRE32973 - Toy bubble-blowing lawn mower
