US Patent 7921644 Power transmission for a thermal elastic wire

A power transmission for a thermal elastic wire including a frame for supporting a pair of anchor posts which stretch said wire there between. One of the posts being pivoted in the frame and having an extension arm projecting therefrom towards the other post. A spring biased rotator drum is rotatably supported in the frame proximate to the end of the extension arm. A flexible connection interconnects the periphery of the rotator drum with the end of the extension arm of the pivoted anchor post. A power takeoff connection on the rotator drum is provided for the attachment of a connecting link there to whereby as the thermal elastic wire changes phase, a smooth power stroke can be extracted from the transition at the power takeoff connection and stored in a spring.