Fluid reaction surfaces (i.e. – impellers) – With control means responsive to non-cyclic condition... – Impeller rotation speed responsive
Reexamination Certificate
2007-03-06
2007-03-06
Verdier, Christopher (Department: 3745)
Fluid reaction surfaces (i.e., impellers)
With control means responsive to non-cyclic condition...
Impeller rotation speed responsive
C416S087000, C416S089000, C416S117000, C416S118000, C415S004300, C415S004500, C290S00100C, C290S055000
Reexamination Certificate
active
10165080
ABSTRACT:
A wind energy conversion device includes a propeller in which each of the propeller blades includes a proximal (radially inward) non-airfoil mounting section, a medial section and a distal tip section mounted to pivot relative to the medial section about a pitch axis running lengthwise of the blade. At low wind speeds, each tip section and its associated medial section cooperate to provide a single airfoil. When the propeller rpm exceeds a predetermined threshold, each of the tip sections begins to pivot toward a full governing position, which tends to reduce the propeller rpm. To permit wind tracking, the device is mounted to pivot on a vertical axis. The propeller blades are downwind of the vertical axis, and slightly inclined to define a cone diverging in the downwind direction. The electrical power generating components are located upwind of the propeller and centered about the propeller axis, and have a radius less than the length of the proximal blade sections. Forming the airfoil component of the blade in several sections (medial section, tip section and further sections as desired) facilitates fabrication by injection molding.
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International Search Report dated Apr. 5, 2004; International Application No. PCT/US03/17908, filed Jun. 6, 2003, entitled Wind Energy Conversion Device.
Birdwell & Janke, LLP
Verdier Christopher
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