Fluid reaction surfaces (i.e. – impellers) – Radially extensible or retractible rotor working member – Having pitch adjustment
Patent
1988-12-02
1990-03-20
Powell, Jr., Everette A.
Fluid reaction surfaces (i.e., impellers)
Radially extensible or retractible rotor working member
Having pitch adjustment
416136, 416140, F03D 704
Patent
active
049097032
ABSTRACT:
A multi-blade, variable pitch wind driven propeller in which a shock absorber is connected with each blade to dampen movement in both the radially inward and radially outward movements of the blade. Tension springs are connected with the blades to move them inwardly against centrifugal force, and in a preferred form of the invention, the tension spring has a variable rate so that it exerts greater resistance near its limit of outward travel. A coil compression spring may also be connected with each blade to absorb loads at the inner limit of travel of the blade and to impart an initial impetus to outward movement of the blade. In addition, retrofit lock nut means is provided for attachment to the ball stud connected to the butt end of each blade to extend along substantially the entire length of the stud and achieve a ratio of ball stud diameter, in inches, to rotor radius, in feet, of least as much as 0.100, thereby minimizing the risk of failure of the stud.
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