Drive device and method for advancing an advancing element

A method for discharging a fluid product from a container through an outlet in the container, the method comprising the steps of:

• arranging a plunger remote from the outlet inside the container, wherein a total advancing distance is defined by a maximum distance the plunger can travel within the container in the direction of the outlet;
• arranging a drive device in a housing proximate the plunger, the drive device comprising:
• a spring device for driving an advancing element in an advancing direction, and
• a tensioning element for tensioning the spring device,
• wherein the spring device is tensioned between a counter-element and one of the advancing element and the tensioning element, and the advancing element is movable relative to the counter-element,
• a first tension distance defined between the counter-element and the advancing element or between the counter-element and the tensioning element is set by translational movement of the tensioning element relative to the housing that tensions the spring device, the first tension distance corresponding to a first partial advancing distance of the advancing element,
• the spring device is releasable to drive the advancing element the first partial advancing distance, and
• a second tension distance defined between the counter-element and the advancing element or between the counter-element and the tensioning element is set by an additional translational movement of the tensioning element relative to the housing that tensions the spring device, the second tension distance corresponding to a second partial advancing distance of the advancing element;
• advancing the plunger in the direction of the outlet under the force of the drive device, by each of the first partial advancing distance and the second partial advancing distance which is shorter than the total advancing distance;
• and
• after or during the advance of the advancing element over the first partial advancing distance and the second partial advancing distance, tensioning the spring device by the first and second tension distance set by translational movement of the tensioning element relative to the housing.