Vertical axis windmill and wind turbine system for generating electricity from wind energy
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United States of America Patent
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Jul 19, 2011
Grant Date -
Sep 4, 2008
app pub date -
Jul 17, 2007
filing date -
Jan 10, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
A lift-type wind turbine having a substantially vertical rotating shaft and a plurality of substantially vertical blades secured to the shaft. Each blade includes a front portion, a rear portion, and a pivot axis pivotally securing the rear and front portions. The rear portion pivots relative the front portion. The blades additionally include bottom and top edges positioned on each of the front portions. Each bottom edge is arranged substantially equidistant from the shaft proximate a first circumference extending substantially horizontally about the shaft, whereas each top edge is arranged substantially equidistant from the shaft proximate a second circumference extending substantially horizontally about the shaft. The blades are angled relative to the rotating shaft. The blades have an open, drag means position as well as a closed, lift means position, and passively switch between the positions based on wind speed for efficient rotation.
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