Patent ID: 7478995

Claim:
A device for locking a holding structure for securing a foldable blade of a rotorcraft rotor to the hub of said rotor, said holding structure being hinged in pitch and in drag relative to the hub, the rotor also comprising respective locking means associated with each of the blade-holding structures and arranged to be capable of causing the pitch hinge of the blade-holding structure to be locked relative to the hub, and also arranged to be capable of locking the drag hinge of the blade-holding structure relative to the hub, the locking means being suitable for being driven by a rotary electric actuator and a drive mechanism, the device further comprising brake means for the rotary electric actuator or the drive mechanism to prevent said actuator and the drive mechanism from turning under the effect of rotor vibration, in the absence of any electricity being fed to the motor, while allowing the actuator and the drive mechanism to rotate when the actuator is powered, and the drive mechanism of the locking means by the actuator being irreversible.