Patent ID: 7931440
Filing Date: 2011-04-26
Classification: F03D,F05B,Y02E

Abstract:
1. A vertical axis wind turbine comprising: a rotatable vertical shaft; a first horizontal shaft rotatably attached to the vertical shaft, and extending on either side of the vertical shaft, the first horizontal shaft having a first side on one side of the vertical shaft, and having a second side on an opposite side of the vertical shaft; a first wind turbine blade fixedly attached to the first horizontal shaft on the first side, the first wind turbine extending in a generally perpendicular direction from the first horizontal shaft; a second wind turbine blade fixedly attached to the first horizontal shaft on the second side, the second wind turbine blade extending in a generally perpendicular direction from the first horizontal shaft, the second wind turbine blade fixed at an operational angle with respect to the first wind turbine blade; a first motion limiting means attached to the vertical shaft, and adjacent to the first side of the of the first horizontal shaft, where the first motion limiting means extends into the rotational travel of the first turbine blade; a second motion limiting means attached to the vertical shaft, and adjacent to the second side of the first horizontal shaft, where the first motion limiting means extends into the rotational travel of the second turbine blade; a second horizontal shaft rotatably attached to the vertical shaft, and extending on either side of the vertical shaft, the second horizontal shaft having a first side on one side of the vertical shaft, and having a second side on an opposite side of the vertical shaft; a third wind turbine blade fixedly attached to the first horizontal shaft on the first side, the third wind turbine extending in a generally perpendicular direction from the second horizontal shaft; a fourth wind turbine blade fixedly attached to the second horizontal shaft on the second side, the fourth wind turbine blade extending in a generally perpendicular direction from the second horizontal shaft, the fourth wind turbine blade fixed at an operational angle with respect to the third wind turbine blade; a third motion limiting means attached to the vertical shaft, and adjacent to the first side of the of the second horizontal shaft, where the third motion limiting means extends into the rotational travel of the third turbine blade; a fourth motion limiting means attached to the vertical shaft, and adjacent to the second side of the second horizontal shaft, where the fourth motion limiting means extends into the rotational travel of the fourth turbine blade; a third horizontal shaft rotatably attached to the vertical shaft, and extending on either side of the vertical shaft, the third horizontal shaft having a first side on one side of the vertical shaft, and having a second side on an opposite side of the vertical shaft; a fifth wind turbine blade fixedly attached to the third horizontal shaft on the first side, the fifth wind turbine blade extending in a generally perpendicular direction from the third horizontal shaft; a sixth wind turbine blade fixedly attached to the third horizontal shaft on the second side, the sixth wind turbine blade extending in a generally perpendicular direction from the third horizontal shaft, the sixth wind turbine blade fixed at an operational angle with respect to the fifth wind turbine blade; a fifth motion limiting means attached to the vertical shaft, and adjacent to the first side of the of the third horizontal shaft, where the fifth motion limiting means extends into the rotational travel of the fifth turbine blade; and a sixth motion limiting means attached to the vertical shaft, and adjacent to the second side of the third horizontal shaft, where the sixth motion limiting means extends into the rotational travel of the sixth turbine blade.