Abstract: A base member is disposed longitudinally in the direction of wind movement and has a pair of parallel endless carriers on opposite sides thereof. These carriers are arranged to move over an upper arcuate run and along a lower straight return run. The upper ends of a number of sail-type vanes are connected between the two endless carriers, and the lower ends of the vanes are connected to rotatable idlers. In the operation of the mechanism, the upper ends of the vanes are lifted at the arcuate portion of the carriers to form sails and are collapsed in the return run, the upper ends of the vanes moving around the lower ends thereof with the latter ends rotating with the idlers.

Abstract: An elongated base is positioned longitudinally in the direction of the wind and has first and second endless carriers operable longitudinally thereof. A plurality of vanes are operably connected to said carriers such that they are disposed upright for surface engagement by the wind while moving from the rearward end of the base to the forward end and are disposed edgewise to the wind for returning, thus providing a driving force for an output from a shaft of one of the carriers. A plurality of side baffles are provided at a rearwardly inclined angle to direct wind into the vanes from the sides.