Head and method for mounting a dispensing member on the neck of a container

A mounting head for mounting a dispenser member, such as a pump or a valve, on a neck of a fluid reservoir so as to constitute a fluid dispenser, the mounting head comprising a mounting member for imparting an axial mounting movement to the dispenser member, which movement brings it from an axial arrangement placed on the neck into a leaktight final mounted position on the neck, the mounting member incorporating axial centering means for bringing the dispenser member into an axial arrangement on the neck of the reservoir if it has been placed in an offset manner on the neck;

• the mounting head comprises a plurality of mounting tabs that are movable axially so as to bring the dispenser member from the axial arrangement towards the final position, and that are movable radially inwards so as to return the dispenser member into an axial arrangement if it has been placed in an offset manner on the neck, the mounting head further comprising an outer clamping collar for simultaneously moving the mounting tabs radially inwards from a spaced-apart rest position.