Method for sealingly closing a bottle and associated sealingly closed bottle

A method for sealingly closing a bottle, the method comprising:

• providing a cage, a closing stopper, and a capsule, wherein:
• said cage is substantially cup-shaped and comprises a first side wall with an inner surface comprising an annular relief in the vicinity of a first free edge of the first side wall, the annular relief projecting radially inward at all times;
• and an outer surface comprising an upper annular spur and a lower annular spur, wherein the upper annular spur is in the vicinity of a closed base, the lower spur is substantially opposite to the annular relief,
• said capsule is cup-shaped and comprises a second side wall which terminates in a second free edge of the capsule, wherein said second side wall of the capsule comprises a first annular projection, a second annular projection, and an annular cavity, the first annular projection being adjacent and above the annular cavity, and the second annular projection being spaced from and at a height above the first annular projection, and
• the cage comprises an elastic retaining element for retaining the closing stopper in position, the elastic retaining element including one or more flexible, radially inward projecting retaining teeth;
• joining the stopper to the cage, and the cage to the capsule, thus obtaining a preassembled closing assembly, wherein said joining comprises having the upper annular spur received in the annular cavity so that the cage is only partially inserted inside the capsule;
• aligning the preassembled closing assembly on a mouth of the bottle and exerting a pressure so as to sealingly close the bottle, wherein the preassembled closing assembly is fitted onto the bottle in such a way that the annular relief of the cage presses elastically against a side surface of a collar of the bottle, and wherein the annular relief of the cage comes into contact with the side surface of the collar of the bottle before the stopper comes into contact with the bottle;
• and
• exercising a pressure directed downwards on the preassembled closing assembly such that the annular relief of the cage engages with the bottom surface of the collar, the annular cavity engages with the lower annular spur, the upper annular spur of the cage is above and adjacent to the second annular projection of the capsule, and the closing assembly remains locked to the bottle.