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|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||416/91 ; 416/119 ; 415/914|
|발명자 / 주소|
|인용정보||피인용 횟수 : 22 인용 특허 : 0|
A variable pitch propeller mechanism includes a plurality of airfoil-shaped blades on three spaced apart blade arms. The airfoil-shaped blades are pivotally connected to the blade arms and are interconnected to each other by rigid connecting rods so these blades move in unison in response to changing wind conditions. Air flow across the airfoil-shaped blades is also controlled to improve the efficiency of the device.
In a vertical axis windmill, a variable pitch propeller mechanism comprising: A) a hub having a hollow housing that includes a base, a closed top end, a cylindrical wall connecting said base and said closed end, and a longitudinal axis extending between said base and said closed end, bearing means on said base, and power generator means connected to said housing; B) three blade arms connected to said housing wall and extending radially outward from said housing wall, said blade arms being spaced apart from each other at equal angular spacings about said ...