Closing assembly for a bottle, associated bottle and assembly method

A method for assembling a closure assembly of a bottle to be assembled on a mouth of the bottle, the method comprising:

• providing a cage, a closing stopper, and a ring nut, wherein:
• the cage is substantially cup-shaped and comprises a side wall with an inner surface comprising a bead and a lip spaced to form a seat for a collar of the bottle;
• the closing stopper comprises a head, wherein the head comprises an upper surface and a lower surface;
• the ring nut is cup-shaped and comprises a side wall;
• the inner surface of the side wall of the cage comprises a retaining tooth for retaining in position the head of the closing stopper at the lower surface;
• the retaining tooth projects cantilevered from the inner surface of the side wall of the cage;
• the outer surface of the side wall of the cage comprises an annular cavity;
• the side wall of the ring nut comprises an inner lower projection configured to engage the annular cavity in a preassembly configuration;
• the side wall of the cage comprises a plurality of windows and each of the windows comprises a tongue connected to a portion of a lower edge of the window along a hinge line;
• the lip is formed at a free end of each tongue;
• and
• each tongue is elastically rotatable about the hinge line;
• each tongue comprises a rounded head so that during assembly, engaging tongues can rotate about the hinge line without an outer diameter of the assembly exceeding a maximum diameter of the bottle;
• pushing the head of the sealing stopper towards the base of the cage;
• partially fitting the ring nut on the cage so that the inner lower projection engages the annular cavity;
• assembling the cage on the bottle so that the collar of the bottle abuts between the bead and the lip.