Patent ID: 8585364

Claim:
A vertical axis wind turbine, comprising: a vertically disposed tower having upper and lower ends; a drive shaft rotatably mounted in said tower which has upper and lower ends; a plurality of radially spaced airfoil supports secured to said drive shaft at the upper end thereof which extend outwardly therefrom; a generally vertically disposed airfoil blade pivotally secured, about a vertical axis, to the outer end of each of said airfoil supports; each of said airfoil blades having a leading edge and a trailing edge; a wind vane operatively secured to each of said airfoil blades which causes pivotal movement of the associated airfoil blade relative to the associated airfoil support in response to wind direction; and a mechanism interconnecting each of said airfoil blades to the associated wind vane which causes pivotal displacement of the airfoil blade with respect to the associated wind vane with the said pivotal displacement being of a magnitude and direction to cause a forward thrust to the airfoil blade from wind acting on the airfoil blade; said mechanism comprising a vertically disposed shaft which is fixedly secured to the airfoil blade with the said shaft having a lower end which extends downwardly from said airfoil blade, an externally helically splined member secured to said shaft in a fixed manner for rotation therewith, a cam block, having upper and lower ends; said cam block being operatively secured to the outer end of the associated airfoil support; said cam block having a vertically disposed helically splined central opening formed therein; said helically splined member on said shaft being positioned in said helically splined central opening in said cam block so that the splines thereof are in mesh with the splines of said splined central opening; said cam block having an arcuate cam groove formed in its exterior surface; a cam roller operatively connected to said airfoil support; said cam roller being received by said cam groove, whereby pivotal movement of said wind vane will cause said cam block to be rotated with respect to said cam roller and vertically moved which causes said externally splined member to be rotated thereby causing said shaft and said airfoil blade to be rotated so that said airfoil blade is not exactly aligned with respect to the wind flow to create a lift to said airfoil blade so that said airfoil blade is urged to move faster than the speed of the wind.