Wind turbines
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United States of America Patent
Stats
-
Mar 11, 1986
Grant Date -
N/A
app pub date -
May 22, 1984
filing date -
May 25, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A wind turbine having the tips of the blades pivotable to a position in which they act as brakes to slow the turbine down. The pivoting is caused by relative axial movement of the tip and main blade portions which is caused by the action of a spring. The spring action is normally overcome by a hydraulic actuator 16. When the hydraulic pressure exceeds a threshold value corresponding to a desired limit rotational speed of the turbine a pressure switch 83 causes a pressure release valve 84 to dump the fluid pressure in the hydraulic actuator 16, thus allowing the spring to operate and cause the pivoting of the tip.
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Cited Art Landscape
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