Patent ID: 8414266

Claim:
A transverse axis fluid turbine, comprising: a. a base structure; b. a rotor rotatably attached to the base structure, having the axis of the rotor being traverse to the direction of flowing fluid; c. at least three blades, each of which comprising: i. an elongated member having first and second ends; ii. a bearing support mounted to the rotor, rotatably receiving the first end of the elongated member to the rotor, allowing the elongated member to rotate about the longitudinal axis thereof; iii. a blade member attached to the second end of the elongated member, extending radially from the rotor; iv. an helical gear disposed at the first end of the elongated member; v. a corresponding gear to the helical gear; d. an actuating device disposed within the rotor, the actuating device comprising: i. an inner rotor shaft rotatably disposed within the rotor, having its axis being the same as the axis of the rotor; ii. a guiding plate attached to the inner rotor, the guiding plate having a guiding pattern thereon and iii. a corresponding guiding plate attached to the inner rotor, the corresponding guiding place faces with the guiding plate and having a corresponding guiding pattern thereon; and vi. a follower attached to the corresponding gear to follow the guiding pattern and the corresponding guiding pattern, causing the corresponding gear to slide longitudinally along the first end of the elongated member, further causing the corresponding gear to engage with the helical gear and to actuate the elongated member to rotate about the longitudinal axis of the elongated member to control the effective exposed area of the blade accordingly to the direction of flowing fluid; and wherein the guiding pattern and the corresponding guiding pattern are grooves and the follower is a stud operably engaging with the guiding pattern and the corresponding guiding pattern.