Patent attributes
Dose indicator device for metered dose inhalers having a base, inner wheel, outer wheel, drive, transmission cog and flexible cover. The drive, inner wheel and outer wheel are concentrically, rotatably mounted about a first rotation axis. The cog rotates about a second axis parallel to the first. The inner wheel has inner annular surface primary indexing teeth and one or more outer annular surface secondary indexing teeth. The outer wheel has indexing teeth on an inner annular surface. The cog has gear teeth engageable with outer wheel indexing teeth and engageable by one or more inner wheel secondary indexing teeth. The drive has one or more arms engageable with primary indexing teeth. The flexible cover being flexible downwardly wherein, in use, downward drive movement is accompanied by drive rotation about the first axis, the rotation causing inner wheel rotation by interengagement of the drive and the primary indexing teeth.
