Patent ID: 8696303
Filing Date: 2014-04-15
Classification: B64C,F04D

Abstract:
1. A feathering device for the fan blades of a turboprop engine comprising at least one set of fan blades with adjustable orientation, the feathering device comprising: an actuator centered on a longitudinal axis and including a rod; a control ring attached to the rod and centered on the longitudinal axis; and a rotating cowling centered on the longitudinal axis and connected mechanically to a turbine rotor, wherein the rotating cowling houses the control ring, wherein each blade-root support of each fan blade is pivotably mounted on the rotating cowling, and each blade-root support of each fan blade is coupled to the control ring to adjust the orientation of each fan blade, the control ring being movable longitudinally between first and second positions in which the first position corresponds to feathering of the blades, wherein a plurality of extendable mechanical parts are each mounted between the control ring and a seat secure to the rotating cowling inside the rotating cowling, the plurality of extendable mechanical parts being substantially parallel to the longitudinal axis and positioned facing the control ring, and the plurality of extendable mechanical parts expanding and extending elastically from a compressed position at a threshold temperature so as to exert a thrust force on the control ring to put the control ring in the first position to feather the blades when the plurality of expandable mechanical parts expands, and wherein a temperature increasing device is provided to increase the temperature of the plurality of expandable mechanical parts to the threshold temperature so as to expand the plurality of expandable mechanical parts.