The invention relates to a carousel that is supported by a rotary plate controlled by a control mechanism (20). The mechanism (20) comprises: means for restraining said rotary plate (10) which are controlled in two states, a restrained state and a released state, said means being suitable for providing, in said restrained state, a rotational restraint of said rotary plate (10), and for allowing, in said released state, a free rotation of said rotary plate (10), and a device (36) for controlling said restraint means that is suitable for driving, on command, said restraint means into said released state, said restraint means being in the restrained state by default.