IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0687640
(1991-04-19)
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발명자
/ 주소 |
- Sultzbaugh John S. (25 Romberger La. Elizabethville PA 17023)
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인용정보 |
피인용 횟수 :
22 인용 특허 :
0 |
초록
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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 changin
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.
대표청구항
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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 o
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 cylindrical wall, each blade arm including two support struts each being connected at a proximal end thereof to said housing wall and extending to a distal end that is spaced radially outward from said wall, said support struts being spaced apart from each other along said housing longitudinal axis, said support struts being parallel with each other, each strut having a longitudinal axis extending between said distal and proximal ends, a plurality of brackets mounted on each strut at locations that are spaced apart from each other along said strut longitudinal axis, a pivot pin mounted on each bracket, an airfoil-shaped blade mounted on each pivot pin, each airfoil-shaped blade including (a) a curved top surface, (b) a curved bottom surface, (c) two ends, (d) a longitudinal axis extending between said airfoil-shaped blade ends, said top and bottom surfaces being curved in the same direction relative to said airfoil-shaped blade longitudinal axis, (e) said top and bottom surfaces being curved around said airfoil-shaped blade longitudinal axis at different curvatures, with said top surface having a greater degree of curvature than said bottom surface, (f) said top and bottom surfaces intersecting each other and defining a leading edge adjacent to said brackets associated with said airfoil-shaped blade, and a trailing edge spaced from said leading edge, and (g) said mounting brackets all being connected to said airfoil-shaped blades adjacent to the leading edge of each airfoil-shaped blade, a first rigid connecting rod connected to one end of each of said airfoil-shaped blades near the trailing edge of each blade, a second rigid connecting rod connected to another end of each of said airfoil-shaped blades near the trailing edge of each blade, said rigid connecting rods connecting all of said airfoil-shaped blades together to move in unison, each blade arm further including a gusset strut connecting one support strut to said housing, said gusset strut being located adjacent to said one strut proximal end and being angled with respect to said one strut, said blade arms all being spaced apart from each other by angles of 120°; boundary layer control means for controlling air flow along said airfoil-shaped blade top surfaces, said boundary layer control means including suction means for drawing air into said airfoil-shaped blades, said suction means including a pump located inside each airfoil-shaped blade, an intake hole defined in said airfoil-shaped blade near said leading edge, an exhaust hole defined in said airfoil-shaped blade near said trailing edge, and means fluidically connecting said pump means to said intake and exhaust holes, said pump being supported on said means fluidically connecting said pump means to said intake and exhaust holes.
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