Plastic container for the controlled dispensing of powders and/or liquids

Claim 1

A container provided for the controlled dispensing of powders and liquids which comprises, a container body, an externally threaded neck provided on said container body, a cylindrical, tubular extension member axially connected at one end to the externally threaded container neck, said cylindrical, tubular extension member having an inner bore comprising a calibrated protion and terminating at the other end thereof in a divergent frustoconical outlet mouth portion, a rupturable transverse membrane diaphragm sealingly separating the calibrated portion from the outlet mouth portion, a circumferential groove provided on the outer surface of said tubular extension member, in the vinicity of the diaphragm, and a cylindrical capsule acting as a sealing and resealing device, said capsule having at one end thereof an internally threaded portion adapted for screw engagement with the externally threaded neck, an elastic retraining ring circumferentially provided on the inner surface of the cylindrical capsule for spring-engagement with said circumferential groove, and a piercing pin extending axially within said cylindrical capsule, said piercing pin piercing the diaphragm when the cylindrical capsule is screwed down onto said neck causing the restraining ring to exit the circumferential groove of the tubular extension member, wherein the calibrated portion of the inner bore of said tubular extension has a diameter larger than the minimum diameter of the divergent frustum conically shaped outlet mouth portion and as such becomes equal to said minimum diameter by the overlapping of the diaphragm edges generated by the piercing action of the piercing pin of the cylindrical capsule, whereby when the restraining ring is engaged in said circumferential groove, the axial movement of the cylindrical capsule relative to the externally threaded neck is prevented.