Patent ID: 8272840

Claim:
A blade support limb for a vertical axis wind turbine having a vertical shaft and blades, comprising fixed support limbs, each having a first end that is connected to the vertical shaft and a second end; rotatable support limbs, each corresponding to one of the fixed support limbs, and each of the rotatable support limbs having a third end that is connected to the second end of the corresponding fixed support limb and a fourth end that is connected to one of the blades; gyration center axes, each disposed between the second end of the fixed support limbs and the third end of the corresponding rotatable support limbs; and multiple control devices, each arranged between the rotatable support limb and an adjacent fixed support limb, and each of the control devices having a fifth end that is connected to the fourth end of the rotatable support limb and a sixth end that is connected to the second end of the adjacent fixed support limb, wherein the rotatable support limbs are capable of rotating around the corresponding gyration center axes and rotatable around the second end of the corresponding fixed support limbs; and said control devices are elastic components and control rotation angle (β) of the corresponding rotatable support limbs around the corresponding gyration center axes.