Patent ID: 8371813

Claim:
A blade pitch controlling apparatus, comprising: a centrifugal device; and a blade pitch variable device, which comprises: a control disk, which comprises a plurality of lifting elements and a plurality of constraining elements, which alternate each other; a setting disk, which is arranged under the control disk, the setting disk comprising a plurality of setting sections to respectively receive a plurality of blade shafts, each setting section being arranged between adjacent lifting element and constraining element, the setting disk forming a plurality of through holes for respectively receiving extension of the lifting elements and the constraining elements in a movable manner, each of the blade shafts comprising a pin having opposite first and second ends; a first spring, which is arranged between the control disk and the setting disk, the centrifugal device and the first spring being respectively positioned against opposite surfaces of the control disk; a plurality of second springs, each of which has a first end coupled to the setting disk and a second end coupled to the first end of each of the pins; and a plurality of adjustment elements, each of which is set below and in contact engagement with the first end of each of the pins, whereby when the control disk is raised to a first predetermined height, the lifting elements respectively raise the first ends of the pins, and when the control disk is lowered down to a second predetermined height, the constraining elements respectively depress downward the second ends of the pins.