Dose counter for dispensers

A dose counter for use with an inhaler comprising a container for medicament equipped with a reciprocal actuator to dispense a dose of medicament therefrom, the dose counter comprising:

• a fixed ratchet member,
• a trigger member constructed and arranged to undergo reciprocal movement co-ordinated with the reciprocal movement between the actuator and the container, said reciprocal movement comprising an outward stroke and a return stroke,
• a counter member in the form of a ring comprising inclined surfaces in the form of at least one set of teeth constructed and arranged to undergo a predetermined counting movement each time a dose is dispensed, the counter member being biased in one direction towards the ratchet and trigger members and being capable of counting motion in a direction generally orthogonal to the direction of reciprocal movement of the trigger, the counter member comprising:
• a first region for interaction with the trigger which comprises at least one inclined surface which is engaged by the trigger during its outward stroke causing the counter member to undergo counting motion,
• a second region for interaction with the ratchet member which comprises at least one inclined surface which is engaged by the ratchet member during the return stroke of the trigger causing the counter member to undergo further counting motion to complete said predetermined counting movement.