EP0490792B1 - Closure and container having a neck provided with a tamper-evident lid - Google Patents

Abstract

The invention relates to a closure and container assembly having a neck, comprising complementary snap-fit means, characterised in that the neck has two successive snap-fit means having between them an annular groove carrying, set back, several embossings (20), which are uneven in number or a multiple of an uneven number, each having at least on one and the same side, to the left or to the right, a lateral bearing edge (21, 22) with one and the same tilt relative to the axis of the neck, the inside of the said closure having embossings (13) which snap fit into the said groove and, after possible rotation of the said closure, interact simultaneously with the said bearing edges (21, 22) of the embossings (20) of the said groove, giving rise to a downward translational movement of the said closure and its definitive snap-fitting. The invention applies to any closure fixed in a tamper-evident manner onto the neck of a container, in particular capsules with a shaft or "service capsules". <IMAGE>

Description

The invention relates to the field of closures inviolably fixed to the neck of a container according to the preamble of claim 1.

Document EP-A-0214095 generally discloses a set of plugs and a necked container, said plugging and said container comprising latching means and below a second latching means consisting of a rod stop having an annular groove between them, the interior of said stopper having local reliefs which snap into said groove and also below said stop ring, said stopper being thus fixed in a tamper-proof manner on the neck and capable of freely rotate around said neck.

The first click defines a guarantee position, and the second click, below the stop ring, defines a position of use, this being reached by means of a blow or a push. The closure is in particular an opening capsule, the base or stump of which is thus snapped onto the neck and is provided with a means of breaking and driving in a cover fixed on the neck.

We also know, from patents EP-B-192011 and EP-B-0119145 of the applicant, a cap comprising means of axial fitting by force of a tamper-evident seal which overcomes the neck of a container. These interlocking means are radial fins of longitudinal notching made of plastic material harder than that of said cover, or fins of longitudinal relief reliefs of the cover.

The second latching described by EP-A-0214095 is usually carried out by the user of the container and it requires a relatively large effort.

The Applicant has sought to develop a set of plugs and a neck container thus giving rise to two successive snaps, but with which the second snap is made easier for a user.

It was concerned with the application of the corresponding means in the case of an opening capsule and a neck with a tamper-evident seal.

STATEMENT OF THE INVENTION

The subject of the invention is an assembly of a stopper and a neck container, as generally known by EP-A-0214095, characterized in that the annular groove recesses several local reliefs of greater or equal number to 3 each having at least one and the same side to the left or to the right a lateral bearing edge of the same inclination relative to the axis of said neck, and in that from the interior of said blocking said local reliefs the interior cooperate after a possible rotation of said plugging with said bearing edges of the reliefs of said groove, causing a downward movement of said plugging which facilitates the latching of its said local reliefs below the stop ring.

The operation of driving in the plug and fixing it in two stages can be explained as follows: the latching means of the inside of the plug, typically a skirt, are its local reliefs which also play a role in driving in plugging beyond the stop ring. At the first click, each of these reliefs is housed at random in the throat of the neck, either against a portion of local relief of the neck itself recessed in this groove, or in an interval between local reliefs. To push the stopper further towards its delivery position for a contained product, it suffices for a slight rotation of this stopper, in any case less than 120 °, in a marked direction if it is local reliefs with edges support only on the right or on the left, so that the descent of the stopper and its snapping under the stop ring occur under two effects: sudden simultaneous sliding of the local reliefs of the stopper against the local reliefs of the neck initiating the crossing of the rush stop, this crossing then being carried out with very little support, the balanced guidance of the preceding sliding and a slight deformation of the skirt or crown of the blocking facilitating this crossing. The position thus obtained is highly inviolable, it applies to various closures fixed on the neck of a container, whether they are associated with a separate sealing means or not, and to cut, pierce or open for the delivery of the content product. For the success of the easy descent of the stopper during its final snap-on, it is important that the local reliefs cooperate by sliding simultaneously, which implies in practice and preferably that they are regularly spaced, these conditions ensuring good maintenance plugging along the axis of the neck. The number greater than or equal to 3 and preferably odd of the local reliefs of the neck allows a good balancing or maintenance of the blockage in any descent position. The odd numbers greater than or equal to 3 thus preferred indeed provide better axial stability than the even numbers, thanks to the constant diametrical asymmetry of their bearing zones. (no small tilting effect).

Preferably, the local reliefs of the neck have bearing edges on the left and on the right, said local reliefs of the plug cooperating either with said bearing edges on the left, or with said bearing edges on the right according to the direction of rotation. clogging.

More specifically, the bearing edges of said local reliefs of the annular groove of the container and of the interior of the stopper are preferably respectively perpendicular to their surfaces. These are then small abrupt lateral edges of these respective local reliefs of the throat of the container and of the internal surface of the stopper, the contacting of which causes a downward reaction which lowers the stopper. The local reliefs of each surface are spaced around the longitudinal axis of the neck and of the stopper, their respective bearing edges being at the same level relative to this axis so as to simultaneously fulfill their role of driving down the capping. The practical rule for the number of local reliefs of the neck is actually addressed to the number of its support edges acting in a depression of the stopper: thus three local reliefs each having a support edge on the left and a support edge at right may, if the local reliefs of the interior of the stopper have corresponding bearing edges, allow a depression of the stopper according to the invention either by slight rotation to the right, or by slight rotation to the left.

The bearing edges of the local reliefs of the neck, preferably regularly spaced as already indicated and whether they are on the left or on the right, have an inclination preferably between 30 and 60 ° and more preferably between 42 and 48 ° by relative to the axis of the neck, the support reliefs of the closure having edges cooperating with said support edges of the neck and of the same inclination as these support edges, said local reliefs of the closure also being spaced and being in number equal or submultiple of the number of said local reliefs of the neck, therefore "equal" in the case where the number of these reliefs of the neck is a prime odd.

For the ease and efficiency of successive snap-ins, it is preferred that the stop ring has an outside diameter 0.2 to 0.6 mm larger than the outside diameter of the first latching means, and that the local reliefs carried by said groove are set back from 0.2 to 0 , 5 mm in radius from the stop ring and set back 0.1 to 0.3 mm from said first latching means. The stop ring can be continuous or have discontinuities preventing a rise in the internal reliefs of the plugging by sliding.

In practice, the portion of the stopper comprising its so-called local reliefs, which cooperate with local reliefs in the throat of the neck to produce the descent of the stopper, is an annular crown 0.6 to 1 mm thick in plastic material, so to be sufficiently deformable to facilitate the two snaps of its local reliefs.

According to a particularly advantageous modality, the stop ring is discontinuous and comprises pairs of sectors or portions allowing the passage down between these sectors of the local reliefs of the blockage, this passage being made with a local forcing on one of these sectors, the descent of the blockage is thus greatly facilitated (driving torque divided by 2 to 3). A provision which allows such a result and further prohibits any rise in the local reliefs of the interior of the stopper is as follows: the sectors of each pair of the stop ring respectively have opposite an edge substantially parallel to the edge of lateral support which surmounts it and one end thinned by an oblique edge, typically also substantially parallel to said lateral support edge, the distance between the lower ends of these edges of the two sectors being less than the minimum overall width of a said relief corresponding to the blockage. The local forcing of this relief to descend through the insufficient gap between these two sectors takes place by elastic deformation downwards of the raised part of said thinned end and by local overlapping of this thin deformed part. Even a little chipped, this thinned end returns in place and completely prevents, with the other sectors acting in the same way with respect to other local reliefs of the blockage, any rise in the blockage above the stop ring. This process is improved when the plastic material of the capsule is harder than that of the neck, a condition known in the case where the capping fits the lid by means of notching fins (see below).

To ensure even better the guiding of the stopper and to prevent fraudulent attempts to remove this stopper from below, it is good in the case where the neck of the container is extended by a shoulder to provide this shoulder with a discontinuous annular crown ( guide only) or continuous (anti-fraud security), this ring fitting inside the stopper from its first click with a small clearance, less than 1 mm in diameter.

All of the foregoing provisions apply in particular to the case in which the closure is an opening capsule provided with a base or strain, this strain comprising said latching means which are reliefs cooperating with the reliefs of the throat of the neck , this neck being surmounted by a tamper-evident seal, the opening part of the capsule comprising means acting on said seal for its cutting or breaking and its insertion into the neck during the downward translation and the latching of said strain under said stop ring.

When this opening capsule as well as the neck and its cover are made of plastic, said means acting on the cover preferably force fit the cover, so that the cover remains fixed in the capsule during its opening and payment of the product contained. These means for force-fitting the cover are then typically either longitudinal fins inside the capsule fitting between longitudinal reliefs of the cover, or else longitudinal radial fins for notching the cover, as known by the two documents cited at the beginning of this description. The plastic material of the capsule is harder than that of the cover to allow the notching, and preferably also in the case of nesting fins / reliefs to obtain a permanent tightening.

In the case of an encasement of the cover by notching fins, it is desirable that the first snap-fastening of the strain of the capsule occurs after the start of the notching at full section of the cover, so as to reduce the maximum driving force.

In this same case, it is advantageous, to facilitate the insertion of the capsule and further reduce the corresponding effort, that the cover carries longitudinal reliefs 2 to 4 times more numerous than the notching fins of the cover and below these longitudinal reliefs a smooth notching portion of lower height than that of said reliefs. The beginning of the insertion of the fins is done easily and without indexing, randomly striating the narrow longitudinal reliefs of the cover, then the notching crossing the smooth portion which secures the cover and the capsule is of duration and effort relatively weak. Below this smooth portion, the cover has a recessed portion preceding an annular cup which serves as a stop for the filling of the neck with said torn cover and then retained in the opening part of the capsule.

In all cases of fitting of the cover by the capsule, the position just snapped on (first click) is preferably the delivery position, the seal by the cover being preserved by its non-breaking.

For opening, the capsule must be rotated by a variable angle but always less than 120 °, in a marked direction or in any direction, and when the capsule is pushed in by the mechanism already described the cover is torn by shearing and it sinks into the neck. If the rotation triggering the insertion is too low to completely tear the cover, the low rotation which accompanies the descent of the capsule by cooperation of the local reliefs of the invention and this descent itself leads to complete tearing and depression of this seal.

When the neck and its cover are made of aluminum or aluminum alloy, the means of the capsule acting on this cover are means of progressive knockdown of folding of this cover inside the neck. The capsule is then preferably made of a harder material than this cover, for example of suitable plastic. Its opening part can be opened in the delivery condition without breaking the seal.

ADVANTAGES OF THE INVENTION

• The delivery fastener is tamper-proof and has increased security. It is obtained essentially by a first snap-fastening, then by a rotation of angle less than 120 ° resulting in the second safer snap-fastening. These procedures are simple for both the manufacturer and the user.
• In the case of capsules with opening on a sealed neck, the final depression effected by said rotation produces at the same time the rupture of the seal and its retention, the opening of the capsule being then released and allowing the product to be used immediately. content.
• It provides anti-burglary means accompanying the insertion, which is very simple for use.

EXAMPLES

FIG. 1 represents an assembly according to the invention in the position of first click-in, in axial section.

Figure 2 is a diagram of local reliefs of the same assembly cooperating in the invention.

Figure 3 is a diagram of the portions of said assembly cooperating for the insertion and latching, in axial section.

Figure 4 shows the same assembly in the final driving position, in axial section.

FIG. 5 represents a second assembly, the neck and the cover of which are made of low-alloy aluminum, in axial section.

FIG. 6 is a diagram of the local reliefs and of the discontinuous stop ring of a third assembly.

FIG. 7 is an enlargement of this diagram, the blocking having just undergone the second snap-fastening.

FIG. 8 shows the neck of the third assembly and part of its capsule, in axial half-section.

The sectional representations of Figures 1,3 and 4 are limited to the plan cutting for clarity.

1. Description of the first set

In Figure 1, we see a tube 1 with neck 2 in HDPE (high density polyethylene) surmounted by an opening capsule 3 in PP (polypropylene) comprising a stump or base 4 and an opening part or cover 5 which can pivot by a hinge at 6 with respect to this base 4. The neck 2 whose end orifice 7 has a diameter of 7.5 mm is surmounted by a tight seal 8 connected to the inside of the neck by a narrow tear-away portion 9 0.2 mm thick. Above this connection 9, the cover successively comprises an externally curved annular skirt 10 with an outer sealing diameter greater than 0.2 mm than the diameter of the orifice 7, then an annular cup 11 with an outer diameter 10 , 5 mm serving as a stop for the future insertion of the cover 8 into the orifice 7, and also serving as a safety stop for mounting the cover in the cover 5, then finally a cylindrical portion 12 of height 5 mm and with an overall diameter of 8.8 mm, having longitudinal reliefs 24 around its periphery.

The neck 2 carries 4 mm below its orifice 7, at the lower end of an inclined outer surface 14 of increasing diameter, a snap-in relief 15 in the form of a rib 15 with an outer diameter of 14 mm and a horizontal annular underside 16 surmounting a recessed cylindrical portion 17 with a diameter of 12 mm and a height of 2.5 mm. This recessed portion 17 is followed by a stop ring. 18 with a diameter of 14.4 mm greater than that of the snap-fit relief 15. The annular reliefs 15 and 18 and the recessed portion 17 delimit an annular groove 19 with a depth of 1 mm (Figures 1 and 2). Inside this groove 19, there are three local reliefs 20 spaced 120 ° in relief of 0.8 mm relative to the bottom 17 of the groove 19, each of these local reliefs 20 being of trapezoidal contour of height 2 , 3 mm with two lateral sides 21 and 22 inclined at 45 ° relative to the direction of the longitudinal axis 23, these sides 21 and 22 corresponding to sharp edges looking respectively to the right and to the left (Figures 1 to 3).

Below the retaining ring 18, there is another annular groove 25 of height 2.7 mm intended for the latching of the local internal reliefs 13 of the strain 4 of the capsule 3 at the end of insertion (local reliefs 13 described below).

The opening part or cover 5 of the capsule 3 comprises a central tube 26 open at its two ends, its inner surface 27 of diameter 8.9 mm carrying radial fins 28 interlocking with forcing between the longitudinal reliefs 24 of the cover 8. It also comprises an intermediate tube 29 which snaps into place with little effort in the stump or base 4.

This strain or base 4 comprises a central cylindrical portion 31 internally carrying the three local snap-on reliefs 13 of thickness 0.8 mm, height 2.3 mm and inside diameter of the envelope at rest 13 mm, each of these local reliefs 13 being of reverse trapezoidal shape with respect to the trapezoidal reliefs 20 of the groove 19, with lateral edges 32 and 33 inclined at 45 ° relative to the axis 23, and being able to be opposite respectively to edges such as 22 and 21. The lower portion 34 of the central portion 31 improves the centering of the insertion operations of the capsule 3, it is deformable transversely to facilitate the crossing of the annular snap reliefs 15 and 18 by the local reliefs 13 that it carries. Its thickness here is 0.7 mm, and in the general case from 0.6 to 1 mm. The strain 4 also comprises an oblique intermediate portion 35 comprising a zone 36 for latching the tubing 29 of the opening part 5 and a rigid outer skirt 39 fitting together with a clearance of 0.5 mm in diameter an annular crown 37 carried by the 'shoulder 38 of the container, this from the first click (crossing of the relief 15).

2. Insertion of the capsule of the first set

The first snap-fastening of the three local reliefs 13 of the strain 4 in the groove 19 is easily obtained, thanks to the conical entry 14 of the neck 2 and to the deformability of the annular crown 34 (Fig. 3) carrying these reliefs 13. The FIG. 3 makes it possible to distinguish the important points for the penetration, the portions concerned of the neck 2 and of the strain 4 being shown apart for greater clarity. Simultaneously, the reliefs 24 and the fins 28 of the cover 8 and the opening part 5 of the capsule 3 have begun to interpenetrate, the cover 8 being immobilized in rotation relative to this capsule 3. The outer skirt 39 already fits the annular crown 37 of the shoulder 38 of the container, preventing a possible tilting of the capsule 3 during the delivery operations.

• les reliefs locaux 13 de la couronne 34 de la souche 4 sont encliquetés dans la gorge 25 avec un jeu assez faible (0,4 mm sur la hauteur) de façon à assurer une immobilisation verticale satisfaisante de la souche 4;
• l'opercule 8 a été déchiré par la rotation de la capsule 3, et sa jupe annulaire 10 a été enfoncée dans l'orifice 7 du goulot 2, permettant un stockage et des rebouchages étanches;
• la jupe extérieure 39 est enfoncée autour de la couronne annulaire 37, empêchant encore mieux les basculements ou soulèvements de la souche 4;
• la capsule 3 peut toujours tourner autour du goulot 2, ce qui est pratique, et l'ouverture de la partie ouvrante 5 entraîne l'opercule 8 maintenant emboîté à force dans cette partie 5. L'utilisateur peut positionner la capsule et sa charnière où il le souhaite pour une utilisation facile.

To then open, the capsule is rotated on itself in one direction or the other and quickly there is a depression and a snap-fastening below the stop ring 18 by the mechanism already described. As seen in Figure 4:

• the local reliefs 13 of the crown 34 of the strain 4 are snapped into the groove 25 with a fairly small clearance (0.4 mm in height) so as to ensure satisfactory vertical immobilization of the strain 4;
• the cover 8 has been torn by the rotation of the capsule 3, and its annular skirt 10 has been pressed into the orifice 7 of the neck 2, allowing storage and tight plugs;
• the outer skirt 39 is pressed around the annular ring 37, preventing even better the tilting or lifting of the strain 4;
• the capsule 3 can always rotate around the neck 2, which is practical, and the opening of the opening part 5 causes the cover 8 now forcibly fitted into this part 5. The user can position the capsule and its hinge where he wants it for easy use.

3. Second set (Figure 5)

The container is a tube 40 made of 99.5% purity aluminum comprising the characteristics of the invention, the local reliefs being obtained by traditional shaping operations. The cover 41 has its circumference 42 thinned to facilitate cutting. The insertion of the hard plastic capsule between the initial locking of the local reliefs 13 below the relief 15 and the final latching of these reliefs 13 below the annular stop relief 18 and in the groove 25 is accompanied by a knockout of the cover 41 and a drawdown of a at least part of this cover 41 inside the neck 2. For this, the opening part 5 of the capsule has an edge inclined at an edge 42 and a bearing edge 43 operating the folding down of the cut part. The local reliefs of the neck are also spaced like the local reliefs 13 of the capsule.

4. Third set (Figures 6 to 8)

The third assembly comprises, like the first, a tube 45 in HDPE and an opening capsule in PP of which only a local relief 13 snapping successively into the annular grooves 19 and 25 appears in FIGS. 6 and 7.
As can be seen in FIG. 6, which is an external unrolled view of the annular groove 19 and of the interrupted stop ring 180 which delimits this groove, said local relief 13 from the inside of the stump or base of the capsule y being shown after it clicks into the groove 19 for the purposes of the explanation, the stop ring 180 comprises spaced sectors 181, 182 and 183.
The pair of sectors 181 and 182 has vis-à-vis an edge 220 parallel to the edge 22 of the local relief 20 of the tube 45 and an end 184 thinned in point by an oblique edge 185 substantially parallel to this same edge 22. The thickness or height of the interrupted rod 180 along the axis of the tube is 0.7 mm and its radial width is, as for tube 1, 1.2 mm. The distance "d" between the lower end 221 of the edge 220 and the lower end 186 of the oblique edge 185 is 2 mm, it is less than the minimum overall width "l" of the local relief 13, which is here the length of its upper edge 130. This relief 13 cannot therefore cross sectors 181 and 182 of the retaining ring 180 in the opposite direction once it has been snapped into the lower groove 25 (FIG. 7). This principle also makes it possible to obtain a partial engagement in raising the local reliefs 13 of the capsule without it being possible to cross the sectors of the stop ring.

In Figure 7, there is shown the elastic deformation of a portion 187 of sector 182 including its thinned end 184, this portion 187 being lying and overlapped by a part of the local relief 13 harder. This relief 13 having crossed the stop ring by sliding along the edge 220 and over the portion 187, this portion 187 straightens up as indicated by arrow 188 and it will prevent with the other sectors any rise in the blockage.

Several driving torque measurements were made to compare this arrangement with discontinuous stop ring 180 and that of the tube with continuous stop ring 18. The opening and driving torque is divided by 2 to 2.3 with the discontinuous layout.

In FIG. 8, it can be seen that the cover 8 in PE-HD carries 36 small reliefs or longitudinal teeth 80, 1.8 mm high, laterally, easy to cut by the 12 longitudinal notching fins 240 carried by the central tube 26 of the opening part 5 of the capsule 3. Below the reliefs 80, there is a smooth portion 81 of height 1.2 mm and of the same overall diameter 8 mm as the longitudinal reliefs 80. The fins 240 are in the process to easily score the reliefs 80 or sometimes to be inserted therein, which produces an anti-rotation fixing of the capsule 3 on the cover 8 and a centering of the depression. Then they will cut in a short time the full and smooth portion 81, which provides a tear-resistant fixing of the cover 8 in the opening part 5 and their stopping in the delivery position of the assembly is facilitated by the outlet of these fins 240 in a recessed portion 82 preceding the annular cup 11, the role of which has already been seen in connection with the tube 1 (first assembly);

The set of means 80, 81 and 82 located above the cup 11 gives a much easier start to depress the capsule.

By adding to this arrangement the discontinuous structure of the stop ring 180 described for this third assembly, one obtains a great facility of the total insertion of the capsule going until the opening of the tube by complete snap-fastening of the capsule, causing rupture of the TE ("Tamper Evidence") and tight sealing of the tube by its cover. The opening torque of the tube of the 3rd assembly, not differing from that of the 1st together only by the features described here, is divided by 2.5 to 3 and is typically from 0.4 to 0.5 Nm

INDUSTRIAL APPLICATIONS

The invention applies to closures attached to the neck of a container and in particular to stub capsules called service capsules, the neck being provided with a tamper-evident seal.

Claims (14)

1. An assembly of a stopper (3) and a receptacle (1; 40) with a neck (2), said stopper (3) and said receptacle (1; 40) comprising complementary catch means (13 and 15, 18), said neck (2) comprising a first catch means (15) and below it a second catch means (18, 180) consisting of a retaining ring, said first catch means (15) and said retaining ring (18, 180) having an annular groove (19) between them, the inside (31) of said stopper (3) having local relief portions (13) which catch in said groove (19) and also under said retaining ring, said stopper (3) being thus fixed inviolably to the neck (2) and being able to rotate freely about said neck (2), characterised in that the annular groove (19) has a plurality of set-back local relief portions (20), three or more in number, each of which has at least one lateral supporting edge (21, 22) on one and the same side, either to the right or the left, the supporting edge(s) being inclined to equal extents in relation to the axis (23) of said neck (2), and in that said local relief portions (13) on the inside (31) of said stopper (3) cooperate simultaneously, after possible rotation of said stopper (3), with said supporting edges (21, 22) of the relief portions (20) of said groove (13), causing said stopper (3) to move downwardly, thereby helping said local relief portions (13) to catch under the retaining ring (18, 180).
2. An assembly according to Claim 1, in which said local relief portions (20) of the neck (2) comprise left-hand supporting edges (21) and right-hand supporting edges (22), said local relief portions (13) of the stopper (3) cooperating either with said left-hand supporting edges (21) or with said right-hand supporting edges (22) in the direction of rotation of the stopper (3).
3. An assembly according to any one of Claims 1 or 2, in which said supporting edges (21; 22) of said local relief portion (20) of the neck (2) are equally spaced apart and are inclined between 30 and 60° in relation to the axis (23), said local relief portions (13) of the stopper (3) having edges (33; 32) which cooperate with said supporting edges (21; 22) of the neck (2) and which have the same inclination as said supporting edges (21; 22), said local relief portions (13) of the stopper (3) being equally spaced apart and being equal in number to, or a submultiple of, the number of said relief portions (20) of the neck (2).
4. An assembly according to Claim 3, in whicn said inclination of the supporting edges (21; 22) (32; 33) of the local relief portions of the neck (2) and of the local relief portions (13) of the stopper (3) is between 42 and 48°.
5. An assembly according to any one of Claims 1 to 4, in which said retaining ring (18, 180) has an external diameter which is 0.2 to 0.6 mm greater than the external diameter of said first catch means (15), said relief portions (20) provided on said groove (19) being set back by between 0.2 and 0.5 mm of the radius in relation to said retaining ring (18, 180) and set back by between 0.1 and 0.3 mm from said first catch means (15).
6. An assembly according to Claim 5, in which said retaining ring (180) is discontinuous and comprises pairs of sectors (181, 182) which enable said local relief portions (13) to pass downwardly between them (181 and 182) inside the stopper (3), the passage being made with local forcing on one (182) of said sectors, descent of the stopper (3) into its final position thus being facilitated.
7. An assembly according to Claim 6, in which the sectors (181, 182) of each of said pair have mutually opposite edges (220) substantially parallel to said lateral supporting edge (22) of the relief portion (20) which surmounts it and an end (184) whose thickness is reduced by an oblique edge (185), the spacing (d) between the bottom ends of said sectors (181, 182) and of said edges (220 and 184) being less than the overall minimum width (1) of a said corresponding relief portion (13) on the inside of the stopper (3), said local forcing on the sector (182) meaning that said end (183) of reduced thickness is elastically deformed, and any ascent of the local relief portions (13) thus being prevented.
8. An assembly according to any one of Claims 1 to 7, in which the portion (34) of the stopper (3) comprising said local relief portions (13) cooperating with the local relief portions (20) of said groove (19) of the neck (2) is an annular rim (34) of 0.6 to 1 mm in thickness and is made of a plastics material, said rim (34) being thus deformable to facilitate the two catching operations with said local relief portions (13).
9. An assembly according to any one of Claims 1 to 4, in which the neck (2) of said receptacle (1) is extended by a shoulder (38), said shoulder (38) comprising a continuous or discontinuous annular rim (37) fitting in the inside (39) of the stopper (3) as soon as the first catching operation has taken place with clearance less than 1 mm at the diameter.
10. An assembly according to any one of Claims 1 to 9, in which said stopper (3) is a cap for opening (3) provided with a base or a stem (4), said stem (4) comprising said catch means (13) consisting of said local relief portions (13) cooperating with the local relief portions (20) of the groove (19) of the neck (2), said neck (2) being surmounted by a cover (8; 41) which cannot be violated, the opening part (5) of the cap (3) comprising means (24; 42, 43) which act on said cover (8; 41) to cut it off or break it and to push it into the neck (2) during the downward movement and catching operation of said stem (4) under said retaining ring (18).
11. An assembly according to Claim 10, in which said cap (3), said cover (8) and said neck (2) are made of plastics material, said means (24) acting on said cover (8), forcibly clamping said cover (8).
12. An assembly according to Claim 11, in which said means (24) for the opening part (5) of the cap (3) which act on said cover (8) are in the form of longitudinal scoring vanes (24) of the cover (8), said cover (8) bearing 2 to 4 times more longitudinal relief portions (80) than said vanes (240) and below said relief portions (80) a smooth portion (81) for being scored which is not as high as the relief portions (80).
13. An assembly according to Claim 12, in which said cover (8), under said smooth portion (81), has an offset portion (82) and then an annular cup-shaped portion (11), said cup-shaped portion acting as an abutment when said neck (2) is being re-stoppered by said cover (8) which has been taken off and kept in said opening part (5) of the cap (3).
14. An assembly according to Claim 10, in which said cover (41) and said neck (2) are made of aluminium or alloy, the means (42, 43) of the cap (3) acting on said cover (41), acting by gradually staving in and folding back inside the neck (2).

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