Compact tamper-proof closure

1. A compact closure for containers with a neck and mouth, comprising:

a body comprising a threaded pourer, said threaded pourer being designed to be firmly fastened onto the mouth of said container;

a threaded cap designed to screw-engage with said threaded pourer,

wherein said threaded pourer comprises an upper structure which has a substantially U-shaped cross-section, with an outer portion and an inner portion which are substantially cylindrical and coaxial, and an upper portion which transversally joins together said outer portion and inner portion,

and wherein an upper surface of said upper portion is convex in cross-section, and from inside outward, said upper surface has a first ascending section and a second descending section; and

a drip-stop lip formed directly on the outer end of said upper portion without any cylindrical part projecting upwards so that said drip-stop lip projects radially outwards as a continuation of said upper portion, such that an upper surface of said drip-stop lip corresponds to at least a portion of said upper surface of said upper portion,

wherein an outer part of said second descending section coincides with said upper surface of said drip-stop lip such that the drip-stop lip extends below said upper surface of the upper portion.

2. The closure according to claim 1 , in which the cross-section of said upper portion is substantially convex.

3. The closure according to claim 1 , in which the valleys of the threads of said pourer have an inner diameter D 5 which is substantially the same as the outer diameter D 4 of said drip-stop lip.

4. The closure according to claim 1 , in which said threaded pourer comprises a section joining together said drip-stop lip and the threaded portion, said joining section having an outer diameter D 3 smaller than D 4 .

5. The closure according to claim 1 , in which said drip-stop lip has an outer diameter D 4 , said cap comprises a threaded undercap comprising a longitudinal upper section with an inner diameter D 3 and said outer diameter D 4 is substantially the same as or slightly smaller than D 3 .

6. The closure according to claim 1 , in which said cap comprises an overcap and a threaded undercap which are fastened together.

7. The closure according to claim 1 comprising an anti-refilling device, comprising at least one of a valve, a ball valve or a siphon.

8. The closure according to claim 1 , having longitudinal extension less than 0.5 diameters and/or less than 15 mm.

9. The closure according to claim 1 , in which said pourer comprises an anti-rotation device which engages with the mouth of said container.

10. The closure according to claim 1 , in which said body comprises a threaded portion, formed in the vicinity of a bottom end of the outer portion of said body.

11. The closure according to claim 1 , in which said pourer is firmly fastened to the mouth of said container via a substantially annular inner tooth which engages in a corresponding outer groove formed on said mouth.

12. The closure according to claim 1 , in which said pourer is made of a rigid polymer material.

13. The closure according to claim 12 , in which said threaded pourer is made of HIPS (high-impact polystyrene), PP (polypropylene) or PC (polycarbonate).

14. The closure according to claim 1 , in which crests of the threads of said cap have an inner diameter D 2 which is substantially the same as or slightly larger than an outer diameter D 4 of said drip-stop lip.

15. The closure according to claim 1 , wherein:

said threaded pourer has a threaded portion and a connecting section joining together said drip-stop lip and said threaded portion,

said connecting section has an outer diameter D 3 ,

said drip-stop lip projects outside said connecting section and has a maximum diameter D 4 greater than said outer diameter D 3 ,

said maximum diameter D 4 of said drip-stop lip is linked to said outer diameter D 3 of the connecting section by means of a substantially horizontal surface.

16. The closure according to claim 15 , wherein said substantially horizontal surface is aligned with a lower surface of said upper portion.

17. The closure according to claim 16 , wherein said connecting section joins together said threaded portion and said upper portion on which said drip-stop lip is formed directly.

18. The closure according to claim 15 , wherein said connecting section joins together said threaded portion and said upper portion on which said drip-stop lip is formed directly.

19. The closure according to claim 1 , wherein said drip-stop lip is delimited upwardly by said second descending portion.

20. The closure according to claim 1 , wherein said drip-stop lip is delimited upwardly by the upper surface of said second descending portion.