Dose counting device for a distributor of doses of fluid products, especially for pharmaceutical use

Claim 1

Dose counting device for a distributor of doses of fluid products, especially for pharmaceutical use, said distributor comprising a container of liquid product provided with a mouth, means for the distribution of doses of fluid from said container through said mouth, a ring nut for fastening said distributor means onto said mouth of the container, a translatable operating member for the operation of said distribution means, characterized in that it comprises elastic means suitable for transforming the translatory motion of said operating member with respect to the ring nut in a rotatory and axially reciprocating motion of a rotating and axially translatable element provided with progressive numerical indices which can be positioned in succession with every dose distributed in a pre-set observation position, said elastic means comprising a succession of small flexible circumferentially distanced legs having an upper part suitable for reacting with a first set of one-directional teeth of the operating member, a lower part suitable for reacting with a second set of one-directional teeth of the ring nut and an intermediate part fastened to the rotating element, so that when said first set of one-directional teeth approaches said second set of one-directional teeth under the action of said operating member, the upper part of said small legs disengages from the corresponding tooth of the first set of teeth to be inserted in an immediately adjacent tooth and thus drives in rotation and axial forward movement said intermediate part of the small leg and when said first set of teeth is moved away from said second set of teeth when the action of said operating member ceases the lower part of said small legs disengages from the corresponding tooth of the second set of teeth, to be inserted in an immediately adjacent tooth and thus drives in rotation and axial backward movement said intermediate part of the small leg.