Actuator and cabin seat comprising such an actuator

An actuator comprising a frame, a motor, an output shaft, and a drive train for driving of the output shaft by the motor, the drive train comprising an upstream element, kinematically connected to the rotor of the motor such that the rotor and said upstream element rotate jointly around their respective rotation axes, a downstream element, kinematically connected to the output shaft such that the output shaft and said downstream element rotate jointly around their respective rotation axes, and a coupling device for coupling the upstream element to the downstream element, said coupling device having a first configuration for transmitting all of the torque exerted by one of the upstream element and the downstream element on the coupling device toward the other of the upstream element and the downstream element when said torque is below a threshold torque, and a second configuration for deviating at least part of said torque exerted by one of the upstream element and downstream element on the coupling device toward the frame when said torque is at least equal to the threshold torque, said frame having an annular bearing surface extending around the downstream element;

• said bearing surface being centered on the rotation axis of the downstream element;
• the coupling device comprising at least one coupling member movable between a first position separated from said bearing surface of the frame when the coupling device is in the first configuration, and a second position bearing against said bearing surface when the coupling device is in the second configuration,
• the or each coupling member has a first bearing surface bearing against the upstream element and a second bearing surface bearing against the downstream element
• one of the upstream element and the downstream element constituting a first element, the other one of the upstream element and downstream element constituting a second element, and the first element has, for the or each coupling member, a respective coupling member housing for receiving the coupling member in its first position.