Drive Mechanism

A medicament dispenser for use with at least one medicament carrier carrying multiple distinct medicament dose portions, the medicament dispenser comprising:

• (a) a dispensing mechanism actuable for dispensing the dose portions carried by the at least one medicament carrier;
• (b) a mouthpiece;
• and
• (c) a cover for the mouthpiece, the cover being movably mounted to the dispenser for sequential movement from a closed position in which the mouthpiece is covered, to a part-open position in which the mouthpiece is partially uncovered, to a second position in which the mouthpiece is fully uncovered, such that the part-open position is between the second position and the closed position;
• wherein the cover is adapted to couple with the dispensing mechanism such that:
• movement of the cover from the closed position to the second position results in full actuation of the dispensing mechanism;
• and
• wherein the cover is adapted to couple with the dispensing mechanism such that:
• movement of the cover from the closed position to the part-open position results in partial actuation of the dispensing mechanism;
• return movement of the cover from the part-open position towards the closed position does not result in actuation of the dispensing mechanism;
• and subsequent movement of the cover towards the second position to a distance equal to the distance between the closed and second positions less the distance between the closed and first positions results in full actuation of the dispensing mechanism, but any further movement of the cover to the second position does not result in actuation of the dispensing mechanism;
• the dispensing mechanism comprising a single direction ratchet mechanism.