Applicator for liquid products with cap and screw advancement

Claim 1

An applicator for liquid products comprising: a casing or flask, with a first end thereof defining a bottom and a second end thereof, opposite said bottom, for receiving a permeable plug that has a collar resting against a shoulder provided at an inner wall of said casing in an area of said second end, said casing having an outer threaded portion and an axially extending outer groove; an envelope enclosing said casing in a longitudinal direction thereof, with said casing being axially displaceable inside said envelope when a cap, covering said second end with said permeable plug and engaging said envelope, is removed from said envelope, said envelope having an inner threaded portion engaging said outer threaded portion of said casing; said cap being provided with a sealing skirt having an inner and an outer wall surface, with said inner wall surface of said sealing skirt contacting directly said permeable plug and with said outer wall surface of said sealing skirt resting against said inner wall of said casing when covering said second end, thereby sealing said plug against leakage; and a knob having a sleeve portion extending toward said second end between said envelope and said casing, said sleeve portion having an end that is facing away from said bottom, said end having a key connected thereto, and having, in the vicinity of said bottom, a retainer ring for connecting said knob to said envelope, with said key engaging said axially extending outer groove provided at said casing to provide a rotationally fixed but axially slidable connection between said knob and said casing for rotating said casing inside said envelope.