Abstract: A disengaging member for releasing a link between a motor and a shaft rotated by the motor, the disengaging member including first and second elements capable of fitting together in a direction substantially parallel to the shaft, one element being capable of being connected to the motor by a link that enables the element to be rotated by the motor, and the other element being capable of being attached to the shaft. The first element includes at least one recess at the fitting interface between the two elements, the second element includes at least one resilient member exerting a radial force on the fitting interface via an insertion member capable of being inserted into the recess, keeping the two elements secured to one another for rotation therewith up until a predefined transmission torque between the insertion member and the first element.