Capsule containing a mixer substance for bottles containing pressurised liquids

A capsule containing a mixer substance for bottles containing pressurized liquids, comprising:

• a lower cap (4) provided with a first security strip (12) and also provided with means for connecting which enable a removable insertion of the capsule onto a mouth (2) of a bottle (1), the means for connecting comprising a screw-coupling between the lower cap (4) and the mouth (2) of the bottle, an upper part of the lower cap (4) being open externalwise and provided with a neck (4a);
• an upper cap (5) that couples externally of the neck (4a) with freedom to displace in an axial direction, the upper cap (5) being provided with a second security strip (13);
• the lower cap (4) further comprising an internal annular hoop (18), made internally of the lower cap (4) below the neck (4a), and constructed so as to insert sealingly internally of the mouth (2) of the bottle when the lower cap (4) is inserted on the bottle;
• a reservoir (8) provided internally of the upper cap (5), to internally contain a substance in the reservoir (8), said substance to be inserted into the bottle when the reservoir (8) is broken;
• wherein the capsule (3) comprises means for coupling to enable an axial movement of the upper cap (5) with respect to the neck (4a) in a downwards direction with respect to the bottle;
• wherein said means for coupling prevents a rising axial movement of the upper cap (5) with respect to the neck (4a) and comprises an external thread (10) arranged on an external part of the neck (4a) that screw-couples with an internal thread (11) arranged internally of the upper cap (5);
• wherein the reservoir includes a bottom (8a) that is breakable;
• wherein the upper cap (5) further comprises a cutter (9) located internally of the upper cap (5);
• wherein the reservoir (8) is inserted solidly and sealingly in the neck (4a) of the lower cap (4);
• the capsule further comprising:
• an external ring (16), solidly constrained to the reservoir (8) and arranged on an external upper part thereof, a section of which has a downwards-facing hook-shape;
• a first internal annular projection (17), arranged on an internal surface of the upper cap (5) in proximity of an internal bottom of the upper cap (5) so as to insert below the external ring (16) following a first downwards translation of the upper cap (5) with respect to the neck (4a) of the lower cap (4);
• means for hooking being provided to realize a solid anchoring between the reservoir (8) and the neck (4a) of the lower cap (4) when the reservoir (8) is inserted on the neck (4a), wherein said means for hooking comprises a second internal annular projection (14), arranged internally of the neck (4a) of the lower cap (4), below which an external annular projection (15) inserts, which external annular projection (15) is arranged on an external surface of the reservoir (8) when the reservoir (8) is inserted on the neck (4a).