A motion toy includes a toy body having an upper part and a lower part pivotally connected together, and a power drive coupled between the upper part and the lower part of the toy body. The power drive is controlled to tilt the upper part and the lower part of the toy body alternatively inward and outward...http://www.google.fr/patents/US6200191?utm_source=gb-gplus-shareBrevet US6200191 - Structure of motion toy
