Mixing stopper

Mixing cap which couples to the neck of an externally threaded package and which bears the product to be mixed with the content of the package, comprising:

• a capsule for anchoring to the neck of the package, in the form of a cup with the bottom perforated and fitted with a central through opening;
• a receptacle containing the product to be mixed with the content of the package, which is housed axially in the capsule, partially passing through the central opening of its bottom and it is open through the base introduced by way of the bottom of the capsule and closed by the opposing base;
• a lid for closing the open base of the receptacle which is provided with a double concentric wall by way of the innermost wall of which it is coupled to the open base of the receptacle for its closing;
• a helical spring which is fitted in a compressed manner between the bottom of the capsule and the receptacle;
• the capsule of which is provided externally with lateral pins for anchoring to the neck of the package which project externally from the wall thereof and axial pins which project from the bottom in a position adjacent to the edge of the central opening of the same, on which the lid for closing the receptacle is coupled by way of its external wall, while internally the capsule is provided on its wall with axial rails leading from the receptacle which bear retaining stops for said receptacle and project from the open base of the capsule, being breakable by means of the complete threading of the closing cap of the package;
• the receptacle of which is provided externally, proceeding from the closed base, with axial guide columns and radial projections matching said columns, the guide columns of which run along the wall of the receptacle, separated from the same, are coupled to the rails of the capsule and pass through the base of said capsule by way of opposable passages and the radial projections of which are positionable below the retaining stops of the capsule;
• the spring of which is located between the guide columns and the wall of the receptacle, incorporated between the base of the guide columns and the bottom of the capsule;
• the receptacle being displaceable axially inside the capsule between a position of maximum coupling, in which the open base of said receptacle is coupled and closed via the closing lid and a position of minimum penetration in which said open base is separated from the capsule.