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1. (WO1998052634) INHALER MECHANISM
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Claims

1. A dosing device comprising a dispensing means for dispensing a dose material, and a dose actuation mechanism, in which the dose actuation mechanism comprises a readily deflectable member, and a series of at least two movable elements which transmit and magnify movement of the first element in the series to the last element in the series by a cascade effect, wherein the deflectable member is movable by airflow, and its movement is transferred to the first element of the said series so as to actuate the dispensing means.

2. A dosing device according to claim 1, wherein the moveable elements are pivoted.

3. A dosing device according to claim 1, wherein the moveable elements are arranged to inter-communicate sequentially, so as to actuate the dispensing means.

4. A dosing device according to claim 1, or 2 or 3 , wherein the deflectable member is movable in response to inhalation by a patient.

5. A dosing device according to any of the preceding claims, wherein a first biasing means communicates with one moveable element so that as movement is transferred between the moveable elements, energy stored in the first biasing means is released to increase the force associated with the movement.

6. A dosing device according to any of the preceding claims, wherein one moveable element remote from the deflectable member is attached to, or acts on, the dispensing means so as to restrain actuation thereof until the said moveable element is deflected as a result of a cascade action.

7. A dosing device according to any of the preceding claims, wherein the dispensing means is associated with a second biasing means, in which energy is stored in compression, which stored energy is released on movement of a moveable element.

8. A dosing device according to any of the preceding claims, further comprising a lid including at least one cam surface, wherein movement of the lid results in the moveable elements being restored to positions of unstable equilibrium ready to cause actuation of the dispensing means when the cascade is triggered.

9. A dosing device according to any of the preceding claims, wherein the moveable elements are movable into a first position of unstable equilibrium, which movement is translated into stored energy, in the second biasing means, and when triggered, move into a second position of equilibrium, during which movement the stored energy is released from the second biasing means to dispense a dose from the dispensing means.

10. A dosing device according to any preceding claims, wherein the moveable elements each comprise over-centre mechanisms.

11. A dosing device according to any preceding claims, wherein the moveable elements are a first and a second over-centre mechanism, the first over-centre mechanism communicating with first biasing means and the second over-centre mechanism communicating, via the dispensing means, with a second biasing means .

12. A dose actuating mechanism for use in a dosing inhaler, comprising a deflectable member and a cascade of at least two moveable elements, movement of the deflectable member being transferred to and between the moveable elements, in such a manner as to trigger the release of stored energy sufficient to release a dose.

13. A dose actuating mechanism according to claim 12, wherein each moveable element is pivoted and comprises an over-centre mechanism.

14. A dose actuating mechanism according to claim 12 or claim 13, wherein first biasing means and second biasing means communicate with the over-centre mechanisms.