Patent ID: 9227723
Filing Date: 2016-01-05
CPC Classification: B64C,B64D,F01D,F05D,Y02T

Claim Text:
1. An adjustment mechanism for adjusting pitch of blades of at least one propeller of a system of contra-rotating propellers for a turbomachine in which each blade is configured to move around a radial axis, comprising: a linear actuator; and a device to convert movement imparted by the linear actuator into rotation of each of the blades in a synchronized manner around their radial axis, the device comprising a bracket of longitudinal axis formed of a central ring, an outer ring, and multiple radial arms rigidly connected to the central ring and to the outer ring, the radial arms traversing a principal annular airstream of the system of contra-rotating propellers, the central ring configured to be subject to actuation of the linear actuator, the central ring and the outer ring being positioned in two separate planes, orthogonal to the longitudinal axis, such that the radial arms are inclined relative to the longitudinal axis, and the bracket being shaped as a truncated cone.