Patent ID: 8820552

Claim:
A locking sleeve for fastening a closure stopper on a container opening, the sleeve comprising a sleeve body having an inner circumferential surface for enveloping coverage of an outer circumferential surface of the closure stopper, the inner circumferential surface being provided with a retaining device at least in an area of overlap with the outer circumferential surface of the locating flange of the closure stopper, wherein the retaining device comprises at least three retaining units which are continuously and radially distributed over the circumference of the inner circumferential surface of the locking sleeve, wherein the retaining units are formed by ribbed webs having web notches which are spaced continuously and apart from one another in an axial direction on the circumferential surface on the locking sleeve, wherein each retaining unit comprises at least three linear web units separated by at least two web notches, and the ribbed webs and web notches of the locking sleeve are located, and engage, the locating flange of the closure stopper in the area of overlap with the outer circumferential surface of the closure stopper.