EP3892584B1 - Sealing cap for a container with threaded neck and suitable for use in a closed transfer system - Google Patents

Description

Technical field of the invention

The present invention relates to a cap for a container with a threaded neck. The invention relates more particularly to a stopper intended for use in a closed transfer system for safely transferring the liquid product contained in the container to another container.

Technical background

In a known manner, in the field of agriculture, various phytosanitary products are used for the treatment of plant species. These products are often in liquid form and stored in containers closed with conventional caps, in particular in large-volume plastic canisters.

However, in the case of certain phytosanitary products, to obtain authorization for placing on the market, the manufacturers must prove that the exposure of the user to the product is negligible during the handling of the original container for the spillage of the product. to another container, in particular to a storage chamber of a product dispensing machine.

In order to meet this requirement, closed transfer systems and plugs specific to this system have appeared which make it possible to avoid any contact between the user and the product contained in the container. The closed transfer system is described in the document WO 99/05446 and caps compatible with this system are described in the documents EP 2 019 048 and WO 2018/034567 .

Briefly, the stopper intended for the closed transfer system is composed of a cylindrical body and a shutter. The cylindrical body delimits a flow space through which the product circulates. The obturator is placed inside the cylindrical body to seal this flow space and to prevent the product from flowing out of the container.

As for the closed transfer system, this comprises a piston which moves in translation and it is designed to cooperate with the stopper of the stopper.

To transfer the product from the original container to another container, the user puts the original container upside down on the transfer system and then actuates the system to raise the piston. During its rise, the piston came into engagement with the obturator and carries the obturator in its race. As a result, the shutter is detached from the cylindrical body of the stopper and is moved in the direction of the container. The flow space is thus freed up and the product can flow from the original container to the new container via the closed transfer system.

Thus, to prepare the transfer and throughout the transfer operation, the user does not manipulate the cap and therefore avoids the risk of being in contact with the phytosanitary product.

In addition, a protective cap is put on the body of the stopper in order to prevent dust or other foreign bodies from settling on the shutter. In this way, the shutter remains clean during the time of transport and storage of the product in the original container. Additionally, the protective cap adds a second layer of protection to prevent product leakage in the event the original container is knocked over.

Existing protective caps include a plate closing off the upper opening of the cylindrical body of the cap. The plate is connected to a tamper evident band mounted around the neck of the cylindrical body.

To remove the cap before the very first opening, the user removes the tamper evident band from the collar by grasping a tab placed on this band. By removing the tamper-evident band, the user causes a rupture of the frangible bridges connecting this band to the plate. Once the tamper evident strip is removed, the user removes the plate to free access to the shutter.

However, the removal of the protective cap as described is not practical because it is done in two steps with the tamper evident band detached to be put elsewhere at the end of the first step. In addition, the tab made on the tamper evident band, given its small size, is difficult to grip, especially when the user is wearing gloves. Finally, the connection between the tamper evident band and the plate can be rigid, which allows removal of the entire cap without breaking the tamper evident band. This therefore renders the initially intended function of the tamper evident strip ineffective.

Thus, the object of the invention is to provide a cap for a closed transfer system provided with a protective cap that is simpler to remove, more practical to use while guaranteeing a good tamper-evident function.

Summary of the invention

• un corps principal présentant une forme cylindrique d'axe longitudinal X-X' et comprenant :
  • une première ouverture axiale et une deuxième ouverture axiale faisant face à la première ouverture axiale;
  • une jupe externe et une jupe interne concentriques, s'étendant en direction de la première ouverture axiale et reliées l'une à l'autre, la jupe interne entourant un alésage axial interne ;
  • une paroi cylindrique s'étendant axialement dans une direction opposée à la première ouverture axiale, et comprenant une extrémité libre délimitant la deuxième ouverture axiale;
• un obturateur à section circulaire, centré autour de l'axe longitudinal X-X' et conformé pour coopérer avec la jupe interne du corps principal de manière à couvrir l'alésage axiale interne de façon étanche, l'obturateur étant prévu pour coopérer avec un mécanisme d'ouverture externe appartenant au système de transfert fermé ; et
• un capuchon de protection couvrant la deuxième ouverture axiale.

With these objects in view, the invention provides a cap for a container with a threaded neck and intended for use in a closed transfer system. This cap includes:

• a main body having a cylindrical shape with a longitudinal axis XX' and comprising:
  • a first axial opening and a second axial opening facing the first axial opening;
  • an outer skirt and a concentric inner skirt, extending in the direction of the first axial opening and connected to each other, the inner skirt surrounding an inner axial bore;
  • a cylindrical wall extending axially in a direction opposite to the first axial opening, and comprising a free end delimiting the second axial opening;
• a shutter of circular section, centered around the longitudinal axis XX' and shaped to cooperate with the internal skirt of the main body so as to cover the internal axial bore in a sealed manner, the shutter being provided to cooperate with a mechanism of external opening belonging to the closed transfer system; and
• a protective cap covering the second axial opening.

• un collier de fixation;
• une charnière ;
• un couvercle monté pivotant par rapport au collier de fixation par l'intermédiaire de la charnière.

According to the invention, the protective cap comprises:

• a fixing collar;
• a hinge;
• a cover pivotally mounted relative to the fixing collar via the hinge.

In addition, the fixing collar comprises a thin veil of material shaped to break under the effect of a traction exerted on the fixing collar. Thus, the user can break the thin veil by pulling on the cover after the latter has been tilted towards its open position. The force applied to the cover is then transmitted to the fixing collar via the hinge and has the effect of breaking the thin veil. The radial dimension of the fixing collar is thus increased, which allows the collar to untie from the wall of the cylindrical body. The protective cap can therefore now be removed from the cylindrical body.

The removal of the protective cap is carried out continuously in a single step during which the user tilts the cover then pulls on the cover to break the thin web in order to separate the protective cap from the cylindrical body. There's no longer a separate tamper evident strip to throw away in the middle of the cap removal operation. The proposed cap is therefore easier to remove.

Furthermore, the configuration of the protective cap of the proposed stopper no longer includes the tamper-evident strip to be detached and its tab. The cap is therefore more convenient to use.

Finally, the function of inviolability is ensured by the thin veil of material because by notifying the state of the veil, the user is informed if the cap has already been opened.

• le collier de fixation est formé par un anneau ouvert se terminant d'un côté par une première extrémité et de l'autre côté par une deuxième extrémité; de plus, le voile mince de matière relie les première et deuxième extrémités;
• selon l'alinéa précédent, le collier de fixation comprend une première zone d'amincissement progressif dans une direction radiale jusqu'à la première extrémité et une deuxième zone d'amincissement progressif dans une direction radiale jusqu'à la deuxième extrémité;
• le collier de fixation comprend une collerette tronconique ; les première et deuxième zones d'amincissement progressif et le voile mince de matière s'étendent axialement jusqu'au voisinage d'un bord d'extrémité libre de la collerette tronconique ;
• le voile mince de matière est situé diamétralement opposé à la charnière ;
• la paroi cylindrique du corps principal comprend un épaulement pratiqué sur une face externe de ladite paroi ; d'autre part, le collier de fixation comprend au moins une surface de butée disposée en-dessous de l'épaulement de la paroi cylindrique ;
• selon l'alinéa précédent, le collier de fixation comprend au moins une encoche ouverte en direction du couvercle; en outre, l'encoche comprend un fond s'étendant dans un plan radial et présentant une dimension radiale supérieure à l'épaisseur du collier de fixation, la surface du fond de l'encoche formant la surface de butée ;
• le capuchon de protection comprend un organe de positionnement prenant appui sur une face interne de la paroi cylindrique du corps principal ;
• à titre d'exemple, l'organe de positionnement est formé d'un premier manchon cylindrique interne qui comprend un bourrelet conformé pour être en appui contre la face interne de la paroi cylindrique ;
• l'obturateur comprenant un plateau circulaire et des pattes d'accrochage élastiques s'étendant en direction de la deuxième ouverture axiale ; d'autre part le capuchon de protection comprend un deuxième manchon cylindrique interne s'étendant jusqu'au niveau des pattes d'accrochage élastiques de l'obturateur et agencé de manière à ce que les pattes d'accrochage élastiques s'appuient sur une face externe du deuxième manchon cylindrique interne ;
• le capuchon de protection comprend une languette de préhension s'étendant radialement vers l'extérieur à partir de la périphérique du couvercle et située diamétralement opposée à la charnière ;
• le couvercle et la bague d'inviolabilité sont reliés ensemble au moyen des ponts frangibles conçus pour se rompre lors de la première ouverture du capuchon de protection.

According to other characteristics of the invention:

• the fixing collar is formed by an open ring ending on one side with a first end and on the other side with a second end; moreover, the thin veil of material connects the first and second ends;
• according to the preceding paragraph, the fastening collar comprises a first zone of progressive thinning in a radial direction up to the first end and a second zone of progressive thinning in a radial direction up to the second end;
• the fixing collar comprises a tapered collar; the first and second zones of progressive thinning and the thin veil of material extend axially to the vicinity of a free end edge of the frustoconical collar;
• the thin web of material is located diametrically opposite the hinge;
• the cylindrical wall of the main body comprises a shoulder made on an outer face of said wall; on the other hand, the fixing collar comprises at least one abutment surface arranged below the shoulder of the cylindrical wall;
• according to the preceding paragraph, the fixing collar comprises at least one notch open towards the lid; in addition, the notch comprises a bottom extending in a radial plane and having a radial dimension greater than the thickness of the fixing collar, the surface of the bottom of the notch forming the abutment surface;
• the protective cap comprises a positioning member resting on an internal face of the cylindrical wall of the main body;
• by way of example, the positioning member is formed of a first internal cylindrical sleeve which comprises a bead shaped to bear against the internal face of the cylindrical wall;
• the shutter comprising a circular plate and hooking lugs elastic extending in the direction of the second axial opening; on the other hand, the protective cap comprises a second internal cylindrical sleeve extending as far as the level of the elastic attachment lugs of the shutter and arranged so that the elastic attachment lugs rest on one face external of the second internal cylindrical sleeve;
• the protective cap comprises a grip tab extending radially outwards from the peripheral of the lid and located diametrically opposite the hinge;
• the cover and the tamper evident ring are joined together by means of frangible bridges designed to break when the protective cap is first opened.

Brief description of figures

• [Fig.1] - la figure 1 est une vue en perspective d'un bouchon selon un exemple de réalisation de l'invention ;
• [Fig.2] - la figure 2 est vue en coupe selon un plan vertical passant par la ligne II-II illustrée sur la figure 1 du bouchon sans le capuchon de protection;
• [Fig.3] - la figure 3 est vue en perspective du capuchon de protection faisant partie du bouchon de la figure 1 ;
• [Fig.4] - la figure 4 est une autre vue en perspective du capuchon de protection;
• [Fig.5] - la figure 5 est une vue de face du capuchon de protection;
• [Fig.6] - la figure 6 est une vue détaillée de la zone référencée VI sur la figure 3 et en coupe selon un plan horizontal passant par la ligne V-V illustrée sur la figure 3;
• [Fig.7]- la figure 7 est vue partielle et en coupe selon un plan vertical passant par la ligne VII-VII illustrée sur la figure 1 ; ladite vue montre la partie supérieure du bouchon;
• [Fig.8]- la figure 8 est une vue partielle et en coupe selon un plan vertical passant par la ligne VIII-VIII illustrée sur la figure 3 ; ladite vue montre une encoche pratiquée dans le capuchon de protection;
• [Fig.9]- la figure 9 est une vue partielle et en coupe selon un plan vertical passant par la ligne II-II illustrée sur la figure 1; ladite vue montre la partie supérieure du bouchon de la figure 1 ;
• [Fig.10]- la figure 10 est une vue de côté du bouchon de la figure 1 pendant une première étape d'ouverture du bouchon ;
• [Fig.11]- la figure 11 est la même vue que la figure 10 montrant une deuxième étape d'ouverture du bouchon ;
• [Fig.12]- la figure 12 est la même vue que la figure 10 montrant une troisième étape d'ouverture du bouchon ; et
• [Fig.13]- la figure 13 est la même vue que la figure 10 montrant une quatrième étape d'ouverture du bouchon.

Other characteristics and advantages of the invention will appear during the reading of the detailed description which will follow for the understanding of which reference will be made to the appended drawings in which:

• [ Fig.1 ] - the figure 1 is a perspective view of a stopper according to an exemplary embodiment of the invention;
• [ Fig.2 ] - the figure 2 is seen in section along a vertical plane passing through the line II-II illustrated on the figure 1 of the cork without the protective cap;
• [ Fig.3 ] - the picture 3 is a perspective view of the protective cap forming part of the cap of the figure 1 ;
• [ Fig.4 ] - the figure 4 is another perspective view of the protective cap;
• [ Fig.5 ] - the figure 5 is a front view of the protective cap;
• [ Fig.6 ] - the figure 6 is a detailed view of the area referenced VI on the picture 3 and in section along a horizontal plane passing through the line VV illustrated on the picture 3 ;
• [ Fig.7 ]- the figure 7 is a partial view and in section along a vertical plane passing through the line VII-VII illustrated on the figure 1 ; said view shows the upper part of the stopper;
• [ Fig.8 ]- the figure 8 is a partial sectional view along a vertical plane passing through the line VIII-VIII illustrated on the picture 3 ; said view shows a notch made in the protective cap;
• [ Fig.9 ]- the figure 9 is a partial sectional view along a vertical plane passing through the line II-II illustrated on the figure 1 ; said view shows the upper part of the cap of the figure 1 ;
• [ Fig.10 ]- the figure 10 is a side view of the cap of the figure 1 during a first stopper opening step;
• [ Fig.11 ]- the figure 11 is the same view as the figure 10 showing a second step of opening the cap;
• [ Fig.12 ]- the figure 12 is the same view as the figure 10 showing a third step of opening the cap; and
• [ Fig.13 ]- the figure 13 is the same view as the figure 10 showing a fourth step of opening the cork.

Detailed description of the invention

The figures 1 to 13 illustrate an embodiment of the stopper according to the invention. The cap 1 shown is designed for use in a known closed transfer system. The cap 1 closes a container containing a liquid product, in particular a phytosanitary product.

On the figure 1 and the figure 2 , the cap 1 comprises a main body 2 of longitudinal axis X-X', a shutter 4 installed inside the main body 2 and a protective cap 3 covering an upper opening of the main body 2.

Here, the plug 1 is described in a position where the X-X' axis is vertical. The terms "top", "bottom", "upper", "lower" refer to the X-X' axis. A location close to the X-X' axis is called "inner", as opposed to a location at a distance from the X-X' axis, called "outer".

The main body 2 has a cylindrical shape whose axis of revolution coincides with the longitudinal axis X-X'. The main body 2 is through and comprises two axial openings opposite to each other. Precisely, the main body 2 comprises a first axial opening 21 intended to receive a neck of the container and a second axial opening 22 facing the first opening 21. Here, the first axial opening 21 is at the bottom while the second axial opening 22 is found at the top. Thus, the second axial opening 22 is also called the upper opening.

The main body 2 comprises an outer skirt 23 and an inner skirt 24 concentric which extend in the direction of the first axial opening 21. The outer skirt 23 and the inner skirt 24 are connected to each other so as to form between it a semi-open annular slot 26 which is designed to receive an upper portion of the neck of the container.

The internal skirt 24 surrounds an internal axial bore 27 through which the stored product flows out of the container.

The outer skirt 23 comprises helical ribs 28 shaped to cooperate with complementary ribs of the neck of the container in order to mount the stopper on the neck and to remove the stopper from the neck by screwing. The outer skirt 23 here forms an outer side wall of the main body 2. The main body 2 further comprises a cylindrical wall 25 extending axially in a direction opposite to the first axial opening 21. The cylindrical wall 25 terminates in an end free axial 252 delimiting the second axial opening 22.

Cylindrical wall 25 is also an outer side wall of main body 2.

As illustrated on the figure 2 , the shutter 4 is installed inside the main body 2. The shutter 4 here comprises a plate 41 extending in a horizontal plane and elastic attachment lugs 42 extending vertically in the direction of the second opening axial 22.

The elastic hooking lugs 42 are designed to grip an external opening mechanism, in particular the head of a piston, belonging to the closed transfer system.

The shutter is fixed to the internal skirt 24 of the main body 2 by support.

Specifically, the shutter 4 comprises a lower crown 43 which bears on a lower end 240 of the inner skirt 24. On the other hand, each elastic attachment lug 42 comprises a nose 421 extending radially outwards . One face of the nose 421 rests on a sealing lip 241 of the outer skirt 24.

Thus, the two supports of the obturator 4 on the internal skirt 24 provide leaktight coverage of the internal axial bore 27, which prevents leakage of the product in normal times and in the event of the container overturning.

The figures 3, 4 and 5 show the protective cap 3 from different angles.

According to the invention and as in the example illustrated, the protective cap 3 comprises a fixing collar 31 which is mounted fixed around the cylindrical wall 25 of the main body 2. Here, the fixing collar 31 comprises a cylindrical trunk 317 which ends in a tapered flange 315 flared downwards.

The protective cap 3 further comprises a hinge 33 and a lid 32 pivotally mounted with respect to the fixing collar 31 by means of the hinge 33. The hinge 33 is for example a film hinge.

Here, the cover 32 is formed by a plate entirely covering the upper opening 22 of the main body 2. The cover 32 further comprises a grip tab 34 which extends radially outward and which is located diametrically opposite the hinge 33. The user can therefore easily handle the cover 32 by grasping the grip tab 34.

The flat surface of the cover 32 makes it possible to eliminate the zones for retaining dust or liquid and to keep the cap 1 clean.

Furthermore, the lid 32 is connected to the fixing collar 31 by frangible bridges 37 which break during the first opening of the cap. A special feature of the protective cap 3 lies in the shape of an open ring of the fixing collar 31. Indeed, the fixing collar 31 is an open ring which ends on one side with a first end 311 and on the other side with a second end 312.

Another feature of the cap is that the two ends 311 and 312 are connected to each other by a thin veil of material 35.

Here, the thin veil 35 is located diametrically opposite the hinge 33 and below the grip tab 34 when the cover 32 is in a closed position.

The thin veil 35 is designed to break under a traction exerted on the fixing collar 31. This traction can be manifested by an effort consisting in separating one radial end from the other which is equivalent to an action tending to enlarge the diameter of the mounting collar. This causes the thin veil to break in the axial direction, which unties the two radial ends of the collar and thus forms two circular branches connected on one side and untied on the other side. These two branches are therefore free to move apart from each other in order to increase the radial dimension of the fixing collar, which makes it possible to release the fixing collar from the main body.

Such traction can be applied to the fastening collar via the lid 32. Indeed, when the lid 32 is in an open position, the user can pull on it to move it away from the main body 2 and to cause the rupture of the web 35. This action is illustrated for example on the figure 12 .

According to another characteristic and as illustrated in the figure 6 , the fixing collar 31 comprises a first zone 313 of progressive thinning in a radial direction up to the first end 311 and a second zone of progressive thinning 314 in a radial direction up to the second end 312. In other words, next to each end, the fastening collar comprises a zone whose thickness gradually decreases towards the end in question.

The first and second thinning zones 313 and 314 extend over the entire length of the cylindrical trunk 317 and up to the vicinity of a lower end edge 316 of the tapered collar 315.

It should be noted that on the cylindrical trunk 317, the thickness of the first and second thinning zones 313 and 314 decreases only in the radial direction. On the other hand, on the collar 315, the thickness of the first and second thinning zones 313 and 314 decreases not only in the radial direction but also in the axial direction. The closer one is to the cylindrical trunk, the more the thickness decreases.

Seen from the outside, this gives a triangular shape to the two zones of progressive thinning at the level of the cylindrical trunk 317.

Like the zones of progressive thinning 313 and 315, the thin veil 35 extends from the cylindrical trunk 317 to the vicinity of the lower end edge 316 of the collar 315. The thin veil forms a breakable part of the fastening collar.

Overall, the two areas of thinning 313 and 314 with the thin veil 35 have the appearance of a negative imprint seen from the outside of the cap.

According to a feature of the cap and as illustrated in the figure 1 , 3 to 5 , the fastening collar 31 further comprises notches distributed uniformly in the circumferential direction of the collar. Here, the notches 36 are four in number and all have the same shape.

The notches are open towards the cover 32. Specifically, each notch 36 comprises two parallel axial slices 362 and a bottom 361 connecting these two slices. The bottom 361 of the notch extends in a radial plane perpendicular to the longitudinal axis X-X'.

As illustrated on the figure 7 and on the figure 8 , the bottom 361 has a radial dimension p greater than the thickness e of the fixing collar. This results from the presence of a portion of local extra thickness 363 towards the inside of the fixing collar. This extra thickness portion 363 ends with an upper end edge extending the radial plane. This upper end edge of portion 363 constitutes the bottom 361 of the notch 36.

The extension of the bottom 361 of the notch 36 towards the inside makes it possible to have an abutment surface 360 which is located below a shoulder 250 formed on an outer face 251 of the cylindrical wall 25.

Such an arrangement makes it possible to retain the fixing collar 31 in place during the tilting of the cover 32 towards the open position. On the other hand, once the thin veil 35 is broken, the arms of the fixing collar formed following this break will move away from the wall 25, which radially offsets the abutment surface 360 with respect to the shoulder and allows to the fixing collar 31 to cross this shoulder.

According to another characteristic of the protective cap 3, the latter comprises a positioning member 38 which serves to properly center the cap when it is placed on the main body 2.

Here, the positioning member 38 is formed by a first internal cylindrical sleeve, hereinafter called the first sleeve 38.

As illustrated on the figure 8 and the figure 9 , the first sleeve 38 comprises an annular bead 380 facing outward. When the cap is mounted on the main body 2, the annular bead 328 faces an internal face 252 of the cylindrical wall 25 and bears against the latter.

The protective cap 3 further comprises a second internal cylindrical sleeve 39 located closer to the longitudinal axis X-X' than is the first sleeve 38. The second sleeve 39 extends in the axial direction up to the level of the legs elastic attachment points 42.

In addition, the second sleeve 39 is arranged so that the elastic attachment lugs 42 rest on an outer face 390 of the second sleeve 39. Specifically, the second sleeve 39 here has a diameter slightly smaller than the internal diameter of the shutter 4. Note that the internal diameter of the shutter 4 is measured between two fastening lugs 42 opposed. Thus, when the protective cap 3 is in the mounted position on the main body 2, the hooking lugs 42 cling to the outer face of the second sleeve 39, which makes it possible to firmly hold the obturator 4 in place and to prevent any movement of the obturator towards the center of the stopper.

We will now describe the steps from the opening of the protective cap 3 to the first use of the cap 1 with reference to the figures 10 to 13 .

On the figure 10 , a first opening step is carried out. During this step, the user grasps the grip tab 34 to lift the cover 32 as illustrated by the arrow A. The frangible bridges 37 break following the removal of the cover 32 from the fixing collar 31. Then, at the second opening stage shown in figure 11 , the user pivots the lid 32 around the hinge 33 to bring it to the open position. As explained above, during this tilting, the fixing collar 31 is held in position on the main body thanks to the notches 36 and the shoulder 250.

Then, once the cover 32 is in the open position as illustrated in the figure 12 , the user pulls on the lid 32 in a direction away from the cap body 2 illustrated by the arrow B. This traction causes the rupture of the thin veil 35 to separate the two ends of the fastening collar 31. following this break deviate. The notches 36 are therefore offset radially with respect to the shoulder 250. The fixing collar 31 is now untied from the main body 2.

Finally, on the figure 13 , the user continues to pull on the lid 32 to release the protective cap 3 from the main body 2. The cap 3 can now be used with the transfer system closed.

After the transfer of the product to another container, the protective cap 3 can be put back on the main body 2. The maintenance of the cap on the main body is ensured by the support of the first sleeve 38 against the internal face 252 of the cylindrical wall 25.

For a good understanding of the invention, the opening of the protective cap 3 is divided into several steps described previously. Nevertheless, in practice, the opening of the cap is carried out continuously in a single operation. The cap remains in one piece throughout the opening.

The stopper, and in particular the protective cap, described above has several advantages. The protective cap is convenient to handle and easy to open. In addition, it improves the cleanliness inside the stopper to avoid any contamination of the product contained in the container. Finally, the protective cap guarantees an effective inviolability function by breaking the frangible bridges and the thin veil.

Claims (10)

1. A cap (1) for a threaded neck container and for use in a closed transfer system, said cap comprising:

   - a main body (2) having a cylindrical shape with a longitudinal axis (X-X') and comprising :

   - a first axial opening (21) and a second axial opening (22) facing the first axial opening (21)

   - an outer skirt (23) and an inner skirt (24) concentrically extending toward the first axial opening (21) and connected to each other, the inner skirt (24) surrounding an inner axial bore (27)

   - a cylindrical wall (25) extending axially in a direction opposite to the first axial opening (21), and comprising a free end delimiting the second axial opening (22);

   - an obturator (4) with a circular section, centered around the longitudinal axis (X-X') and shaped to cooperate with the internal skirt (24) of the main body so as to cover the internal axial bore (27) in a sealed manner, the obturator being designed to cooperate with an external opening mechanism belonging to the closed transfer system; and

   - a protective cap (3) covering the second axial opening (22);

   said assembly being characterized in that:

   - the protective cap comprises :

   - a fixing collar (31);

   - a hinge (33)

   - a cover (32) pivotally mounted with respect to the fixing collar (31) by means of the hinge (33);

   - the securing collar (31) includes a thin web of material (35) shaped to break under tension on the securing collar.
2. Cap (1) according to claim 1, characterized in that:

   - the fastening collar (31) is formed by an open ring terminating on one side by a first end (311) and on the other side by a second end (312); and

   - the thin web of material (35) connects the first and second ends.
3. Cap (1) of claim 2, characterized in that the fastening collar (31) comprises a first zone of progressive thinning (313) in a radial direction to the first end (311) and a second zone of progressive thinning (314) in a radial direction to the second end (312).
4. Cap (1) according to claim 2 or according to claim 3, characterized in that:

   - the fastening collar (31) comprises a truncated cone-shaped flange (315);

   - the first and second tapered areas and the thin web of material (35) extend axially to the vicinity of a free end edge (316) of the frustoconical flange.
5. Cap (1) according to any of the preceding claims, characterized in that the thin web of material (35) is located diametrically opposite the hinge (33).
6. Cap (1) according to one of the preceding claims, characterized in that:

   - the cylindrical wall (25) of the main body (2) comprises a shoulder (250) made on an external face of said wall; and

   - the fastening collar (31) comprises at least one stop surface (360) disposed below the shoulder (250) of the cylindrical wall.
7. Cap (1) according to the preceding claim, characterized in that:

   - the fastening collar (31) comprises at least one notch (36) open towards the cover (32) ;

   - the notch (36) comprises a bottom (361) extending in a radial plane and having a radial dimension (p) greater than the thickness (e) of the fastening collar, the surface of the bottom (361) of the notch (36) forming the stop surface (360).
8. Cap (1) according to one of the preceding claims, characterized in that the protective cap (3) comprises a positioning member (38) bearing on an internal face (251) of the cylindrical wall (25) of the main body (2).
9. Cap (1) according to the preceding claim, characterized in that the positioning member is formed by a first internal cylindrical sleeve (38) which comprises a bead (380) shaped to bear against the internal face (251) of the cylindrical wall (25).
10. Plug (1) according to one of the preceding claims, characterized in that :

    - the cap comprising a circular plate (41) and resilient hooking tabs (42) extending towards the second axial opening (22); and

    - the protective cap (3) comprises a second inner cylindrical sleeve (39) extending to the level of the resilient lugs (42) of the closure (4) and arranged so that the resilient lugs (42) rest on an outer face (390) of the second inner cylindrical sleeve (39).

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