FR2822810A1 - CAPPING DEVICE FOR A CONTAINER, PROVIDED WITH HOLDING AND LOCKING MEANS OF A CAST OR MOLD JOINT, AND METHOD FOR PRODUCING THE SAME - Google Patents

Abstract

The invention concerns a closure device for a carboy designed for a liquid dispenser of the water fountain type. The device comprises a cap (3) including a transverse wall (5) wherefrom projects an outer skirt (6). The transverse wall has, on its inner surface (29), an annular groove (30) coaxial with the cap, delimited by two ribs (31, 32) projecting from the transverse wall. The groove is designed to receive a cast or moulded joint (34), and to prevent the displacement thereof parallel to the transverse wall. The groove can also include on its inner surface means for catching said joint.

Description

<Desc / Clms Page number 1>

The invention relates to a closure device for a cylinder comprising a neck provided with a bead external to its free end and intended for a liquid dispenser of the water fountain type.

The distribution of water by generally refrigerated fountains is a very common system in countries such as the United States of America and certain Asian countries. The water to be distributed is delivered in cylinders with a capacity of five gallons (19/20 liters) which are placed upside down on the distributor, the latter making it possible to distribute the water in smaller volumes, for example in glasses.

The invention relates more particularly to plugging devices commonly called non-spill, that is to say which allow, thanks to an internal valve system which releases the passage of water out of the cylinder only when the latter is located in place on the dispenser, put the bottle on the dispenser and remove it from the dispenser, even before it is empty, without risk of spillage of the contents of the bottle.

Such closure devices are known, in particular from document FR-A-2 769 004 issued by the applicant.

Such a device generally comprises a plastic capsule comprising a transverse end wall from which protrude in the same direction, on the one hand a substantially cylindrical outer skirt, provided with an internal bead for attachment behind the bead of the neck of the cylinder and, on the other hand, a substantially cylindrical interior chimney intended to receive a withdrawal cannula provided on the dispenser to fit into the chimney from the transverse end wall of the capsule, when putting in place of the cylinder on the dispenser.

In addition, the device may include a tamper-evident seal molded in one piece with the capsule and located at the start of the chimney, on the side of the transverse wall, so as to close off the chimney, the said seal being

<Desc / Clms Page number 2>

 intended to be irretrievably and visibly destroyed during the fitting of the withdrawal cannula into the chimney In order to ensure a good seal between the neck of the bottle and the closure device mounted on said neck, a seal is generally placed against the inner face of the transverse wall of the capsule, between the outer skirt and the chimney. The seal is intended to be compressed axially between the rim of the neck of the cylinder and the transverse wall of the capsule, when the closure device is mounted on said neck. Most often, it is a foam joint, flat and discoidal, in the center of which is a hole allowing the passage of the chimney.

Such a device is for example described in document US Pat. No. 5,662,231.

Certain devices of the prior art provide a projection on the internal face of the transverse wall of the capsule, the said projection being intended to penetrate into the seal when the closure device is mounted on the neck and that the seal is compressed. Such a projection is in particular intended to prevent the relative displacement of the seal relative to the transverse wall of the capsule. Reference will be made in particular to documents US 5,687,865, US 4,874,023 and US 5,392,939.

However, such devices have a certain number of drawbacks: - on the one hand, the projection does not always allow good retention of the seal against the transverse wall of the capsule, the seal being able in particular to detach from said wall by being moving axially inward of the capsule; - on the other hand, there is a significant shear force at the level of the contact zone between the projection and the seal, which can lead to cracking or rupture of the seal, and consequently to a loss of sealing . This problem is all the more frequent as the cylinders are stacked on top of each other on pallets, the pallets themselves being stacked, so that the cylinders are subjected to significant efforts.

<Desc / Clms Page number 3>

 This results in a deterioration of the state of the seal during storage and transport of the cylinders.

The invention aims to solve these problems.

To this end, and according to a first aspect, the invention relates to a closure device for a cylinder comprising a neck provided with a bead external to its free end and intended for a liquid dispenser of the water fountain type, the so-called device comprising a plastic capsule comprising a transverse end wall from which protrudes a substantially cylindrical outer skirt, provided with an internal bead for attachment behind the bead of the neck of the cylinder, in which the transverse wall has, on its inner face, an annular groove with an axis substantially coincident with the axis of said capsule, delimited by two ribs projecting substantially perpendicular to said transverse wall, said groove being located, when the device is mounted on the neck of the cylinder, opposite the edge of said neck, and being intended to receive a cast or molded joint and to prevent displacement nt thereof parallel to the transverse wall.

According to a more elaborate version, the plugging device further comprises a substantially cylindrical inner chimney, projecting from the transverse end wall in the same direction as the outer skirt so that the groove is located between the skirt and the chimney , said chimney being intended to receive a withdrawal cannula provided on the distributor to come to fit into the chimney from the transverse end wall of the capsule, during the positioning of the cylinder on the distributor, as well as '' a tamper-evident seal molded in one piece with the capsule and located at the start of the chimney, on the side of the transverse wall so as to close off the chimney, the said seal being intended to be irreparably and visibly destroyed during the fitting of the withdrawal cannula into the chimney.

According to other characteristics, the axial height of the ribs is less than the thickness of the joint when it is not compressed. The ends of the two ribs are axially offset from each other. A first

<Desc / Clms Page number 4>

 rib is located axially, relative to the axis of the capsule, approximately two-thirds of the diameter of said capsule, a second rib being located substantially the same distance from the axis of the capsule as the inner end of the bead inside of the skirt.

In addition, the groove comprises, on its inner face, at least one means for attaching the seal, thus preventing the displacement of said seal out of the groove.

In this way, the seal, put in place by casting or molding, is held against the transverse wall both by a physicochemical adhesion force, and by the mechanical attachment means or means. In addition, the groove maintains the joint in all directions parallel to the transverse wall of the capsule.

The process for producing the joint (by casting or by molding) allows the mechanical attachment means to penetrate into the material of which the said joint is made before it solidifies. Thus, any risk of rupture of the joint following the force exerted by the fastening means is eliminated.

According to a first version of the invention, the groove comprises, on its inner face, at least one projection forming hooking means for said seal.

According to a first embodiment, at least one rib comprises a projection extending substantially radially towards the inside of the groove.

The axial height of the projection decreases from the rib to the end of said projection, so as to form a point capable of penetrating into the joint. The projection is located towards the free end of the rib.

For example, each of the two ribs comprises a projection extending substantially radially towards the inside of the groove.

<Desc / Clms Page number 5>

 According to a second embodiment, the bottom of the groove comprises at least one projection extending substantially axially towards the inside of the capsule.

The projection comprises at least one face inclined at an acute angle relative to the axis of the capsule so that, when the seal is placed in the groove, at least one area of said seal is included in a catching area located axially between the bottom of the groove and part of said projection.

The projection has, in axial section, the shape of at least one trapezium whose large base is located towards the free end of said projection. Said trapezium has an axis of symmetry substantially parallel to the axis of the capsule.

The axial height of the projection is less than the axial height of the ribs.

In one possible embodiment, the projection is annular, the axis of said projection being substantially coincident with the axis of the capsule.

According to a second version of the invention, the inner face of the groove includes localized reliefs such as ridges, roughness, or the like, forming a hooking means for the joint.

According to a second aspect, the invention relates to an assembly comprising a closure device as previously described and a seal placed in the groove of the transverse wall of said capsule, the seal having been put in place by casting or by molding.

According to a third aspect, the invention relates to an assembly comprising a closure device as previously described, a seal placed in the groove of the transverse wall of said capsule, the seal having been put in place by casting or by molding, and a cylinder, said cylinder being empty or at least partially filled with a certain content.

<Desc / Clms Page number 6>

When the capsule is mounted on the neck of the bottle, the groove is located opposite the edge of said neck, the seal being compressed, in the groove, between the transverse wall of the capsule and the edge of the neck of the bottle.

Finally, according to a fourth aspect, the invention relates to a method for producing a capsule-seal assembly. According to a first variant, the seal is poured into the groove of the capsule, said capsule having been previously molded by injection. According to a second variant, the capsule and the seal are produced by bi-injection molding.

The other characteristics of the invention result from the following description of embodiments, description made with reference to the appended figures in which: - Figure 1 is an elevational view of a closure device according to the invention, comprising a capsule and mounted on a bottle neck; - Figure 2 is a top view of the device of Figure 1; - Figure 3 is a partial axial sectional view of the device of Figure 1, showing a seal cast in a groove present inside the capsule; - Figure 4 is a view of detail A of Figure 3, according to a first embodiment; - Figure 5 is a view of detail A of Figure 3, according to a second embodiment; - Figure 6 is a sectional view of the device mounted on the neck of the cylinder, along line B-B of Figure 2; - Figure 7 is a sectional view similar to Figure 6, showing the closure device after placement of the cylinder on a dispenser; - Figures 8 and 9 schematically illustrate a variant of the method of producing a capsule provided with a seal, said capsule being shown in partial axial section.

The capping device as illustrated by the appended figures, is intended for capping the neck 1 of cylinders for a water dispenser of the fountain type, cylinders which generally have a capacity of five gallons (19/20 liters) and which are made for example of polycarbonate.

<Desc / Clms Page number 7>

 As shown in Figures 6 and 7, the neck 1 has, at its free end, an outer bead 2 for attachment.

The closure device comprises a capsule 3 of axis 4, comprising a transverse end wall 5 from which project in the same direction on the one hand an outer skirt 6 which is essentially cylindrical and on the other hand an inner chimney 7 also of essentially cylindrical in shape, the axial height of the chimney 7 here being less than the axial height of the skirt 6.

The skirt 6 has an inner bead 8, for example interrupted in several sectors, intended to cooperate with the outer bead 2 of the neck 1 in order to maintain the capsule 3 on the neck 1, by mutual clipping.

The chimney 7 comprises, on its inner face, two annular reliefs 9, 10 the function of which will be detailed later.

A plug 11 in the form of a cup is fitted into the free end 12, that is to say opposite the transverse wall 5, of the chimney 7. The plug 11 essentially comprises a bottom 13, located towards the free end 16 of the chimney 7, a substantially cylindrical wall 14, projecting relative to the bottom 13, and an outer annular rim 15 provided towards the bottom 12 to come to bear against the free end 16 of the chimney 7 during the fitting of the plug 11 in the chimney 7 (see Figures 3 and 6).

The plug 11 further comprises: - on the outer face of its cylindrical wall 14, a first annular projection 17, intended to cooperate with the first annular relief 9 of the chimney 7 when the cylinder is not placed on the distributor ; - On the outer face of its cylindrical wall 14, a second annular projection 18 or a shoulder 18 'intended to cooperate with the second annular relief 10 of the chimney 7 when the cylinder is not placed on the dispenser;

<Desc / Clms Page number 8>

- vers l'extrémité libre de sa paroi cylindrique 14, un rebord intérieur 19, dont la fonction apparaîtra à la description de la figure 7.

- towards the free end of its cylindrical wall 14, an inner rim 19, the function of which will appear in the description of FIG. 7.

At the birth of the chimney 7, on the side of the transverse wall 5, the chimney 7 is closed by a cover 20 which is molded in one piece with the capsule 3, in the form of a rupture diaphragm constituted by eight petals 21 in the form of sectors of a circle, connected together by tear lines 22 in the form of rays. Preferably, the cover 20 has a slightly conical shape, the tip of the cone being turned towards the plug 11.

The diameter and the axial height of the chimney 7 are chosen so that when the plug 11 is fully fitted into the chimney 7, its outer rim 15 being in contact with the free end 16 of the chimney 7, the inner rim 19 at the free end of the cylindrical wall 14 of the plug 11 is distant from the cover 20 by a distance corresponding at least to the radius of the chimney 7, therefore substantially to the length of the petals 21.

The skirt 6 has internally a tear line 23 (weakening line) which extends from the free end of the skirt 6, through the internal bead 8 interrupted at this point, to between the bead 8 of the skirt 6 and the transverse wall 5, substantially to the right of the top of the outer bead 2 of the neck 1 of the cylinder. A gripping tab 24 provided on the skirt 6 makes it possible to tear off the latter, that is to say to tear the capsule 3 along the tear line 23, which means that the remaining capsule no longer holds on the neck 1 from the cylinder.

We will now describe the installation of the cylinder with the capsule 3 on a dispenser, with reference to FIG. 7, as well as the withdrawal of the cylinder from the distributor and the filling of the said cylinder.

FIG. 7 represents the bottle filled with water, closed by the capsule 3, after its installation in the inverted position on a dispenser of which only the withdrawal cannula 25 has been shown since it is the only part of the

<Desc / Clms Page number 9>

 dispenser which cooperates with the closure device which is the subject of the present invention. The withdrawal cannula 25 has a substantially cylindrical body comprising at least one withdrawal hole 26 intended for the passage of the liquid from the interior of the cylinder towards the exterior of the dispenser.

When placing the bottle on the dispenser, in the inverted position, the head 27 (upper end) of the withdrawal cannula 25 first causes the rupture of the seal 20 at the tear lines 22, c that is to say a subdivision of the cover 20 into eight petals 21 which, remaining attached by their base to the chimney 7, are folded up by the head 27 of the cannula 25. The head 27 of the cannula 25 then enters the plug 11 whose inner rim 19 snaps into a groove 28 formed between the head 27 and the body of the cannula 25. Then the cannula 25 driving the plug 11 pushes the latter up out of the chimney 7, releasing the first annular projection 17 from the first annular relief 9 and the second annular projection 18-or the shoulder 18'-from the second annular relief 10. The water contained in the carboy can thus flow through the holes of withdrawal 26 into the cannula 25, and supplying the dist ributeur.

When the bottle is lifted to be removed from the dispenser, whether it is empty or whether it still contains water, the withdrawal cannula 25 on which the cap 11 remains engaged snaps the cap 11 back into the free end of the chimney 7, until the outer rim 15 abuts against the free end 16 of the chimney 7, the projections 17, 18 also cooperating with the reliefs 9, 10. Thus, the plug 11 fitted fully into the chimney 7 is detached from the cannula 25, again ensuring the sealed closure of the cylinder.

plus maintenue sur le col 1 de la bonbonne. Après re-remplissage de la To refill the cylinder at the original source, the skirt 6 is torn off along the tear line 23 of the capsule 3 by a pull exerted on the tab 24, the capsule 3 can then be removed by hand without effort, not being

more maintained on the neck 1 of the cylinder. After refilling the

<Desc / Clms Page number 10>

 cylinder, a new closure device is placed on the neck 1, the cover 20 and the skirt 6 of which are intact, which is a guarantee of the origin of the content of the cylinder (double tamper-evident function).

According to an embodiment not shown, the closure device according to the invention can be provided with a third tamper-evident means consisting of a circumferential tamper-evident ring or band connected to the free end of the skirt by frangible means, for example a weakening line or discrete bridges, the ring being engaged behind a second external bead provided on the neck 1 of the cylinder, at a distance below the upper bead 2. The inviolability or guarantee ring may be any type, or constituted by a heat-shrinkable ring, the retraction of which is produced during the fitting of the capsule 3, after filling. This guarantee ring completes the two means of inviolability or of guarantee constituted by the cover 20 and the removable skirt 6.

It should be noted that the closure device according to the invention can be used without a stopper 11. In fact, the seal 20, as long as it is not destroyed by the withdrawal cannula 25, not only constitutes a means of guaranteed or inviolable, but also ensures a tight sealing of the capsule 3.

Of course, in the absence of a cap 11, the capsule 3 does not prevent the flow of water out of the cylinder which would be withdrawn from the dispenser before being completely empty.

We will now describe, with reference to FIGS. 3 to 5, the sealing means provided in the capsule 3.

The inner face 29 of the transverse wall 5 has an annular groove 30, of axis substantially coincident with the axis 4 of the capsule 3.

The groove 30 is delimited by a first rib 31, located axially, with respect to the axis 4 of the capsule 3, substantially at two-thirds of the diameter of said capsule 3, ie substantially midway between the chimney 7 and the outer skirt 6, and by a second rib 32, located towards the periphery of the

<Desc / Clms Page number 11>

 transverse wall 5, substantially at the same distance from the axis 4 of the capsule 3 as the inner end of the inner bead 8 of the skirt 6, the said ribs 31, 32 projecting substantially perpendicular to the transverse wall 5.

Thus, the groove 28 is located, when the capsule 3 is mounted on the neck 1 of the cylinder, opposite the rim 33 of the neck 1.

The groove 30 is intended to receive an O-ring 34, put in place by pouring or by molding, as shown in FIG. 3. When the capsule 3 is mounted on the neck 1 of the cylinder, the seal is compressed in the groove 30, between the rim 33 of the neck 1 and the transverse wall 5 of the capsule 3.

The axial height of the ribs 31, 32 is less than the thickness of the seal 34 when it is not compressed, but is sufficient to maintain the seal 34 inside the groove 30. It is understood that the height axial of the ribs 31, 32 is adjusted to allow the seal 34 to ensure a very good seal between the capsule 3 and the neck 1, when the capsule 3 is mounted on the neck 1 of the cylinder.

In one possible embodiment, the ends of the two ribs 31, 32 are offset axially with respect to each other.

The groove 30 makes it possible to prevent movements of the seal 34 parallel to the transverse wall 5, the seal 34 being held between the ribs 31, 32.

In order to improve the retention of the seal 34 in the groove 30, and in particular to prevent it from escaping from said groove 30 by an axial movement moving away from the transverse wall 5, the groove 30 is provided protrusions intended to penetrate into the material of the seal 34, when the latter is cast or molded, so as to form a means of hooking said seal 34. The protrusions have come from manufacture, by molding, with the capsule 3.

<Desc / Clms Page number 12>

According to a first embodiment, illustrated by FIG. 4, each of the two ribs 31, 32 comprises an annular projection 35, of axis substantially coincident with the axis 4 of the capsule 3, extending radially inward of the groove 30. The invention also provides an embodiment in which the projections 35 form an acute angle with the ribs 31, 32. The projections 35 are each located towards the free end portion of a rib 31, 32.

The axial height of each of the projections 35 decreases from the rib 31, 32 to the end of the projection 35, so as to form a point capable of penetrating into the joint 34.

According to a second embodiment, illustrated by FIG. 5, the bottom 36 of the groove 30, substantially coincident with the transverse wall 5 of the capsule 3, has a projection 37 directed towards the inside of the groove 30, substantially axially.

The projection 37 has, in axial section, the shape of a trapezoid, or rather of two trapezoids symmetrical with respect to the axis 4 of the capsule 3.

saillie 37. Le trapèze possède un axe de symétrie 40 sensiblement parallèle à l'axe 4 de la capsule 3. The small base 38 of the trapezoid is substantially coincident with the bottom 36 of the groove 30, the large base 39 of the trapezium constituting the free end of the

projection 37. The trapezium has an axis of symmetry 40 substantially parallel to the axis 4 of the capsule 3.

The distinct trapezoid faces of the bases 38, 39 are inclined with respect to the bottom 36 of the groove 30 at an acute angle, for example between 40 and 80, in particular close to 60. The axial height of the projection 37 is less than that of the ribs 31, 32.

According to an embodiment not shown, the projection 37 has, in axial section, the shape of a trapezium whose large base is substantially coincident with the bottom 36 of the groove 30, the small base of the trapezium constituting the free end of the projection 37. The small base can be very small in length, so that the trapezoid is like a triangle.

<Desc / Clms Page number 13>

Au moins une face du trapèze, distincte des bases, est inclinée par rapport au fond 36 de la gorge 30 d'un angle aigu, par exemple compris entre 40'eut 80', notamment voisin de 600.

At least one face of the trapezoid, distinct from the bases, is inclined relative to the bottom 36 of the groove 30 at an acute angle, for example between 40'eut 80 ', in particular close to 600.

According to another possible embodiment of the invention, the internal face of the groove 30 is provided with localized reliefs forming mechanical attachment means for the seal 34.

For example, the inner face of the groove 30 has ridges, scales, asperities formed by electroerosion, or the like. The invention also provides for creating inside the groove 30 a rough or granite surface state.

In the case of casting, the establishment of the seal 34 is done by depositing a certain volume of material at the bottom of the groove 30, the capsule 3 having been previously molded by injection. This deposit can be made from an extruder or a hot melt gun). The material of the seal 34, hot and liquid, or at least pasty, spreads over the bottom 36 of the groove 30, coats and covers the projections 35, 37.

The joint 34 is generally allowed to take its natural geometric shape, which leads to a curved surface, as illustrated in FIG. 3.

The configuration of the projection 35,37 is such that there is a zone 41-said attachment zone-comprised axially between the bottom 36 of the groove 30 and the said projection 35,37. A part of the material deposited at the bottom of the stopper and flowing against the bottom 36 of the groove 30 is placed in the attachment zone 27.

Thus, in addition to the physicochemical bonding of the seal 34 poured onto the bottom 36 of the groove wall 30, there is, due to the presence of the projections 35, 37 or the reliefs of the inner face of the groove 30, an attachment. mechanical of said seal 34, once solidified, which prevents it from detaching from said groove 30.

<Desc / Clms Page number 14>

 Consequently, despite the stacking of the cylinders on each other and the efforts which result therefrom at the joint 34, the latter is held in position against the transverse wall 5, both parallel and perpendicular thereto, thanks to at the groove 30 and the projections 35, 37, without risk of rupture of the seal 34.

Referring now to Figures 8 and 9 which illustrate a second alternative embodiment of the 3-joint capsule assembly 34, by bi-injection molding. It should be noted that the figures are simplified, the ribs 31, 32 and the projections 35, 37 do not appear.

The seal 34 is first injected, between a first mold part 42 and a core 43 which define the shape of said seal 34 (Figure 8). The junction between the first mold part 42 and the core 43 is sealed.

After the seal 34 has cooled down, the capsule 3 is injected between a second mold part 44 and the core 43, so as to overmold the seal 34 (FIG. 9). The protrusions 35, 37 are thus molded inside the seal 34, which ensures good attachment of said seal 34. The capsule 3 is for example made of high density polyethylene (HDPE).

After a cooling time, the 3-seal capsule assembly 34 is ejected from the mold.

In an alternative embodiment, the first and second parts 42, 44 of the mold have the same internal profile, so that, after the cooling of the seal 34 previously cast, it suffices, without opening the mold, to move the said first or second part 42, 44 relative to the core 43, so as to define a housing in which the capsule 3 will be cast.

The invention finally provides a simplified closure device (not shown), provided with the groove 30 and a seal 34 cast or molded, in which the capsule 3 comprises neither chimney 7, nor plug 11, nor cover 20, but only a skirt 6 provided with a tear line 23, one end of which is located between

<Desc / Clms Page number 15>

 the bead 8 and the transverse wall 5, so as to allow a user to remove the capsule from the neck of the cylinder by action on the tab 24. This simplified version of cylinder can be placed on a dispenser without cannula, very quickly, so as to avoid any water spraying. On the other hand, if the cylinder is removed from the dispenser before being completely empty, the seal is no longer ensured.

Claims (23)

 CLAIMS 1. Clogging device for a cylinder comprising a neck (1) provided with an external bead (2) at its free end and intended for a liquid dispenser of the water fountain type, the said device comprising a capsule (3 ) made of plastic comprising a transverse end wall (5) from which a substantially cylindrical outer skirt (6) projects, provided with an internal bead (8) for attachment behind the bead (2) of the neck (1 ) of the cylinder, characterized in that the transverse wall (5) has, on its inner face (29), an annular groove (30) of axis substantially coincident with the axis (4) of said capsule (3) , delimited by two ribs (31,32) projecting substantially perpendicular to said transverse wall (5), said groove (30) being located, when the device is mounted on the neck (1) of the cylinder, facing the rim (33) of said neck (1), and being intended to receive a joi nt (34) cast or molded and to prevent the displacement thereof parallel to the transverse wall (5). 2. Clogging device according to claim 1, characterized in that it further comprises an inner chimney (7) substantially cylindrical, projecting from the transverse end wall (5) in the same direction as the outer skirt (6 ) so that the groove (30) is located between the skirt (6) and the chimney (7), said chimney (7) being intended to receive a withdrawal cannula (25) provided on the distributor to come fit into the chimney (7) from the transverse end wall (5) of the capsule (3), when the bottle is placed on the dispenser, and in that it comprises a tamper-evident seal ( 20) molded in one piece with the capsule (3) and located at the start of the chimney (7), on the side of the transverse wall (5), so as to close off the chimney (7), the so-called cover ( 20) being intended to be irreparably and visibly destroyed during the fitting of the withdrawal cannula (25) in the chimney (7). 3. Clogging device according to claim 1 or 2, characterized in that the axial height of the ribs (31,32) is less than the thickness of the seal (34) when it is not compressed. <Desc / Clms Page number 17> 4. Clogging device according to any one of claims 1 to 3, characterized in that the ends of the two ribs (31, 32) are offset axially with respect to each other. 5. Clogging device according to any one of claims 1 to 4, characterized in that a first rib (31) is located axially, relative to the axis of the capsule (3), substantially two thirds of the diameter of said capsule (3), a second rib (32) being located substantially the same distance from the axis (4) of the capsule (3) as the inner end of the inner bead (8) of the skirt (6 ). 6. Clogging device according to any one of claims 1 to 5, characterized in that the groove (30) comprises, on its inner face, at least one means for hooking said seal (34), thus preventing displacement of the seal (34) out of the groove (30). 7. Clogging device according to claim 6, characterized in that the groove (30) comprises, on its inner face, at least one projection (35,37) forming hooking means for said seal (34). 8. A closure device according to claim 7, characterized in that at least one rib (31,32) comprises a projection (35) extending substantially radially towards the inside of the groove (30). 9. Clogging device according to claim 8, characterized in that the axial height of the projection (35) decreases from the rib (31,32) to the end of said projection (35), so to form a point capable of penetrating into the seal (34). 10. A closure device according to any one of claims 7 to 9, characterized in that the projection (35) is located towards the free end of the rib (31,32). <Desc / Clms Page number 18> 11. A closure device according to any one of claims 7 to 10, characterized in that each of the two ribs (31, 32) comprises a projection (35) extending substantially radially towards the inside of the groove (30) . 12. Clogging device according to claim 7, characterized in that the bottom (36) of the groove (30) comprises at least one projection (37) extending substantially axially towards the inside of the capsule (3). 13. A closure device according to claim 12, characterized in that the projection (37) comprises at least one face inclined at an acute angle relative to the axis (4) of the capsule (3) so that, when the seal (34) is placed in the groove (30), at least one area of said seal (34) is included in a hooking area (41) located, axially, between the bottom (36) of the groove (30 ) and part of said projection (37). 14. Corking device according to claim 12 or 13, characterized in that the projection (37) has, in axial section, the shape of at least one trapezium whose large base is located towards the free end of said projection (37). 15. Corking device according to claim 14, characterized in that said trapezium has an axis of symmetry (40) substantially parallel to the axis (4) of the capsule (3). 16. A closure device according to any one of claims 12 to 15, characterized in that the axial height of the projection (37) is less than the axial height of the ribs (31,32). 17. Clogging device according to any one of claims 7 to 16, characterized in that the projection (35,37) is annular, the axis of said projection (35,37) being substantially coincident with the axis ( 4) of the capsule (3). 18. Clogging device according to claim 6, characterized in that the internal face of the groove (30) comprises localized reliefs such as <Desc / Clms Page number 19>  striations, roughness, or equivalent, forming a hooking means for said joint (34). 19. Assembly comprising a closure device according to any one of claims 1 to 18 and a seal (34) placed in the groove (30) of the transverse wall (5) of said capsule (3), the seal (34 ) having been put in place by casting or by molding. 20. An assembly comprising a closure device according to any one of claims 1 to 18, a seal (34) placed in the groove (30) of the transverse wall (5) of said capsule (3), the seal (34 ) having been put in place by casting or by molding, and a carboy, the said carboy being empty or at least partially filled with a certain content. 21. The assembly of claim 20, characterized in that, when the capsule (3) is mounted on the neck (1) of the cylinder, the groove (30) is located opposite the flange (33) of said neck (1 ), the seal (34) being compressed, in the groove (30), between the transverse wall (5) of the capsule (3) and the rim (33) of the neck (1) of the cylinder. 22. A method of producing an assembly according to claim 19, characterized in that the seal (34) flows into the groove (30) of the capsule (3), said capsule (3) having been previously molded by injection. 23. A method of producing an assembly according to claim 19, characterized in that the capsule (3) and the seal (34) are produced by bi-injection molding.