Dose counter for inhalers

A device for counting doses of substance issued by a dispenser for fluids or powders, the device comprising a first count wheel (10;

• 110) and a second count wheel (20;
• 120), both of said count wheels being mounted to rotate about a fixed axis of rotation (3;
• 103), said first count wheel comprising a set of teeth (11;
• 111) extending circumferentially about said fixed axis of rotation and co-operating with a drive member (30;
• 130) for rotating said first count wheel about said fixed axis of rotation on each use of the dispenser, said first count wheel further including a drive tongue (14;
• 114) movable between a rest position in which it does not co-operate with said second count wheel, and a drive position in which it does co-operate with said second count wheel to cause it to rotate about said fixed axis of rotation, said drive tongue being forced into its drive position by cam means (8;
• 108), a first locking device (6;
• 106) acting on the first count wheel to prevent it from returning in the direction opposite to the direction of rotation imposed by said drive element, and a second locking device (23, 51;
• 123, 151) acting on said second count wheel to prevent it from rotating in either direction when said drive tongue of said first count wheel is in its rest position, wherein said second count wheel co-operates, after issuing a predetermined number of doses, with fixed abutment means (52;
• 152) which prevent any subsequent rotation of said second count wheel.