ASSEMBLY COMPRISING A CONTAINER AND A CAPPING DEVICE ATTACHED TO THE CONTAINER

Abstract

The invention relates to an assembly that includes: - a container comprising a neck equipped with a retaining collar, and - a capping device comprising: • a lower ring (9), • a plug (1); • a hinge device (10) connecting the plug (1) to the lower ring (9); and • a locking device configured to lock the plug (1) in the open inclined position, said locking device comprising a slat (23) and a projecting portion (24) axially extending from the lower ring (9); the slat (23) and the projecting portion (24) being configured such that, when the plug (1) is in the open inclined position, the projecting portion (24) is held between the slat (23) and the retaining collar.

Description

The invention relates to an assembly comprising a container and a stoppering device that is equipped with a stopper and allows said stopper to be kept fixed to the neck of a container, thus preventing the stopper from being lost altogether. Technological background In the prior art, stoppering devices are known that allow a stopper to be stored attached to a neck of the container. Such a stoppering device is, for example, described in document EP1406820 or US2018086510. The capping device consists of a lower ring that is intended to be retained over the neck of the container, a plug that is intended to cover the orifice of the container in order to seal it, two elastic sheets that link the plug to the lower ring, and a locking device positioned to lock the plug in an open, tilted position. This type of stopper is not entirely satisfactory. Specifically, it is designed to hook onto the neck of the container and cannot be adapted to other neck shapes. Furthermore, the stopper's movement between the closed and open (tilted) positions is a simple pivoting motion, which limits the height of the stopper and / or neck that can be used. This restricts the applications of this stopper. In particular, it is unsuitable for containers intended for carbonated beverages because the pressure inside these containers would cause the stopper to open unexpectedly. Furthermore, the locking device is not adapted to all types of plugs and does not ensure sufficient reliability to maintain the open tilted position on screw-on plugs, for example. Brief description of the invention One idea based on the invention is to provide an assembly comprising a container and a capping device equipped with a cap fixed to the neck of the container, suitable for screwing onto the neck of the container, which: - allows the plug to be reliably locked in an open, tilted position where it does not interfere with the discharge of the container's contents; and - that it is simple to manufacture. According to one embodiment, the invention provides an assembly that includes: - a container equipped with a neck, the neck comprising a distribution hole, a helical thread rotating about an X-axis provided on the neck, and a clamping collar, - a capping device that includes: - a lower ring axially fixed to the neck and rotatably movable about the neck around said X-axis, said lower ring comprising a first sector comprising fastening elements that project radially into the lower ring and are arranged below the clamping collar to axially retain the lower ring on the neck of the vessel and a second sector, the first and second sectors of the lower ring being hinged to each other so that the second sector rotates with respect to the first sector between a lowered position in which the second sector is arranged below the clamping collar and a raised position in which the second sector is arranged at least partially above the clamping collar, - a plug including a top wall and an external peripheral skirt, the external peripheral skirt having a helical thread intended to cooperate with the helical thread of the neck to allow displacement of the plug between a closed position and a released position in which the helical thread of the plug is no longer engaged with the helical thread of the neck; • an articulation device comprising two plates connecting the outer peripheral skirt and the second sector and configured to allow the plug to pivot between the released position and an open inclined position in which the plug is released from the neck hole; the second sector of the lower ring being suitable to be positioned in the lowered position when the plug is in the open inclined position; The capping device also comprises a locking device configured to lock the cap when it is in the open tilted position, said locking device comprising: • a heel projecting axially from the outer peripheral skirt between the two plates of the articulation device and consisting of a strip projecting radially outwards; and • a projecting portion projecting axially from the second sector of the lower ring between the two plates of the articulation device; • the strip and the protruding portion being configured in such a way that, when the plug Rczonn / cznz / e / YiAi is in the open inclined position and the second section of the lower ring is in the lowered position, the protruding portion is squeezed between the slat and the clamping collar. Thanks to this arrangement, the locking device ensures a robust, wide-angle locking of the cap in its open, tilted position. Furthermore, compared to a locking device consisting of a strip positioned against the neck of the container, the proposed arrangement limits the strip's radial dimension. This is particularly advantageous because a strip with an excessively large radial dimension can compromise the reliability and performance of bottling operations, especially those involving the transport of capping devices on conveyors before being placed on the containers. According to other advantageous modes of implementation, such a set may present one or more of the following characteristics. According to one embodiment, the slat and the protruding portion are configured such that, when the plug is in the open inclined position and the second section of the lower ring is in the lowered position, the slat and the protruding portion are in contact with each other in an area located in the plane of the clamping collar. According to one embodiment, e1> L - e2 with: L: the length of the sheets in an initial state in which the plug is in the closed position; e1: a radial distance between a contact zone of the slat intended to come into contact with the protruding portion when the plug is in the inclined open position and an intersection between a straight line passing through the upper ends of the sheets and a plane of symmetry of the sheets relative to each other; and e2: a radial distance between a contact zone of the protruding portion intended to come into contact with the slat when the plug is in the inclined open position and an intersection between a straight line passing through the lower ends of the sheets and the plane of symmetry P. According to one realization, e1> L - e2 + e3 + e4 with: e3: radial play between the lower ring and the neck according to the radial direction to the X axis and inscribed in the plane of symmetry P; and e4: a radial play between the protruding portion and the retaining collar. According to one embodiment, e1 = L - e2 + e3 + e4 + Δ with Δ between 0.05 and 2 mm. According to one embodiment, the protruding portion projects beyond a lower limit of the outer peripheral skirt. According to one embodiment, the first sector of the lower ring includes a front zone diametrically opposite the second sector and two clamping zones, each positioned between the front zone of the first sector and the second sector. The clamping elements are located only in the two clamping zones to allow radial movement of the lower ring. This movement facilitates the passage of a portion of the second sector to each side of the clamping collar during the movement of the second sector between the lowered and released positions. In this way, the tensile forces exerted on the lower ring to allow the second sector to move between the lowered and raised positions are reduced, thus facilitating the use of the capping device. According to one embodiment, the second sector has no fastening elements. According to one embodiment, the front area of ​​the first sector lacks fastening elements. According to one embodiment, the fastening elements are protrusions that project radially inwards. According to one embodiment, the second sector extends over an angular range between 90 and 180°. According to one embodiment, the front zone of the second sector extends over an angular range between 40 and 150°. According to one embodiment, each of the two clamping zones extends over an angular range of between 10 and 90°. According to one embodiment, the first sector and the second sector are separated from each other by two thinned zones in which the lower ring locally exhibits a decrease in radial thickness in order to allow the articulation of the second sector with respect to the first sector. According to another embodiment, the lower ring has a sufficiently thin thickness to allow the second sector to pivot with respect to the first sector without the first and second sectors being separated from each other by two thinned zones. According to one embodiment, the outer peripheral skirt includes a notched portion, and the elastic sheets are attached to said outer peripheral skirt at said notched portion. Such a configuration allows for elastic sheets of sufficient length while limiting the dimensions of the gaps between the plug and the lower ring, which could allow dust to pass through. According to one embodiment, the lower ring is connected to the outer peripheral skirt by means of frangible bridges. According to one embodiment, the capping device is molded in one piece. According to one embodiment, the plates and the locking device are configured such that, during the pivoting movement of the plug between the released position and the open inclined position, the elastic plates are subjected to a tensile force that increases to an intermediate unstable position and then decreases from that intermediate unstable position to the open inclined position. According to one embodiment, when the plug is in its open inclined position and the second sector of the lower ring is in the lowered position, the opening angle of the plug is greater than 120° and, advantageously, greater than or equal to 145° and, for example, on the order of 180°. Brief description of the figures The invention will be better understood and other purposes, details, features, and advantages thereof will become more evident from the following description of several particular embodiments of the invention, given only by way of illustration and not of limitation, with reference to the accompanying drawings. Figure 1 is a three-quarter perspective rear view of a capping device mounted on the neck of a container. Figure 2 is a cross-sectional view of a container neck intended to receive the capping device of Figure 1. Figure 3 is a side view of the capping device mounted on the neck of the container and depicts the capping device plug in a released position where it is no longer coupled to the neck of the container. Figure 4 is a detailed view of the fastening elements that project radially inwards from the lower ring of the capping device. Figure 5 is a perspective view of the capping device mounted on the neck of the container and depicts the capping device plug in an open, tilted position where the plug is released from the neck hole. Figure 6 is a cross-sectional view of the capping device mounted on the neck of the container and depicts the capping device plug in an open, tilted position where the plug is released from the neck hole. Figure 7 is an enlargement of Figure 1 that illustrates the locking device in detail. Figure 8 is a schematic cross-sectional representation of the plug and the strip. Figure 9 is a schematic cross-sectional representation of the lower ring and the protruding portion. Description of the implementation method In the description and figures, the X-axis corresponds to the axis of rotation of the stopper 1 of the capping device when it is screwed onto the neck 2 of the container. By convention, radial orientation is directed orthogonally to the X-axis, and axial orientation is directed parallel to the X-axis. The terms external and internal are used to define the relative position of one element with respect to another, with reference to the X-axis. An element close to the X-axis is thus described as internal, as opposed to an external element located radially on the periphery. The terms upper and lower are used to define the relative position of one element with respect to another by reference to a position in which the hole 3 of neck 2 is facing upwards and the plug 1 is in the closed position in neck 2 of the container. An element intended to be placed lower is called lower, and an element intended to be placed higher is called upper. The terms front and rear are used to define the relative position of one element with respect to another along a diameter perpendicular to the X-axis. With regard to Figures 1 to 6, the following describes an assembly comprising a capping device, represented in particular in Figure 1, and a container equipped with a neck 2, represented in particular in Figure 2. As shown in Figure 2, the neck 2 of the container has an upper end with an opening 3 that allows the container's contents to be poured. The neck 2 of the container includes a support collar 4 that projects radially outward and a clamping collar 5 that also projects radially outward and is positioned axially between the support collar 4 and the opening 3. A cylindrical portion is formed axially between the support collar 4 and the opening 3. Furthermore, the neck 2 includes, positioned axially between the clamping collar 5 and the opening 3, a helical thread 6 formed by a series of helical ribs, projecting radially outward from an external surface of the neck 2.The helical thread 6 is intended to cooperate with a complementary helical thread 7, represented in particular on figure 5, formed by a series of helical ribs that are formed in the plug 1 of the plugging device. According to one embodiment, the helical thread 6 formed in the neck 2, as well as the helical thread 7 formed in the plug 1, are interrupted. In other words, the adjacent helical ribs are separated by a space that forms a vent and allows, in particular, the evacuation of gas present inside the container while the plug 1 is still fitted into the neck 2. The stopping device includes a lower ring 9 retained in the neck 2 of the container, a stopper 1 designed to cover the orifice 3 of the container to seal it, and a hinge device 10 connecting the stopper 1 to the lower ring 9. The stopper 1 is movable between a closed position, shown in Figure 1, and a released position, shown in Figure 3, in which the stopper 1 is no longer engaged with the neck 2. The stopper 1 is also suitable for tilting from the released position to the open, tilted position, shown in Figures 5 and 6, in which the stopper 1 is withdrawn from the orifice 3 of the neck 2 so as not to obstruct the pouring of the container's contents. The stopping device also includes a locking device positioned to lock the stopper 1 in the open, tilted position. As shown in particular in Figure 1, the plug 1 includes a top wall 13 intended to be substantially orthogonal to the X-axis, opposite the hole 3 of the neck 2 when the plug 1 is in the closed position. The plug 1 further includes an external peripheral skirt 14 intended to surround the neck 2 of the container when the plug 1 is in the closed position. The external peripheral skirt 14 extends downwards, perpendicular to the top wall 13, from the outer periphery of the top wall 13. The helical thread 7 is provided on the inner face of the external peripheral skirt 14. As shown in particular in Figures 5 and 6, the plug 1 also includes an internal skirt 8, which extends perpendicularly downwards from the upper wall 13 of the plug 1 and is sized to fit inside the hole 3 of the neck 2. The plug 1 also includes an annular lip 15 that extends radially from the upper wall 13 between the internal skirt 8 and the external peripheral skirt 14. The internal skirt 8 and the annular lip 15 are sized so that, when the plug 1 is in the closed position in the neck 2 of the container, the internal skirt 8 is in contact with the inner face of the neck 2, while the annular lip 15 is in contact with the outer face of the neck 2. In this way, the internal skirt 8 and the annular lip 15 ensure a leak-proof closure. Advantageously, the lower ring 9 is, before the first opening of the Rczonn / cznz / e / YiAi container, connected to plug 1 by frangible bridges, not visible in the figures, intended to break during the opening of plug 1. These frangible bridges thus constitute tamper-evident seals. The lower ring 9 is held axially on the neck 2 of the container while being able to rotate with respect to it about the X-axis. As shown in Figures 1, 3, and 4, the lower ring 9 includes two parts that are articulated to each other, namely a first sector 16 and a second sector 17 by which the lower ring 9 is connected to the plug 1 by means of the articulation device 10. According to one embodiment, the lower ring 9 includes two narrowed zones, i.e., zones whose radial thickness is less than the radial thickness of the lower ring 9 outside of these narrowed zones. The two narrowed zones delimit the first sector 16 and the second sector 17. The narrowed zones thus form pivots that allow the articulation of the second sector 17 with respect to the first sector 16. According to another embodiment, the lower ring 9 does not have narrowed zones delimiting the first and second sectors 16 and 17. As shown in Figure 3, the second sector 17 is capable of pivoting upwards relative to the first sector 16, between a lowered position in which the second sector 17 is positioned below the clamping collar 5 and a raised position in which the second sector 17 is at least partially positioned above the clamping collar 5. This allows the plug 1 to move upwards relative to the neck 2 of the container, until the helical thread 7 of the plug 1 disengages from the helical thread 6 formed in the neck 2 of the container. In other words, when the plug 1 is unscrewed, the lower ring 9 is dragged in rotation about the X-axis while the second sector 17 of the lower ring 9 rotates relative to the first sector 16 to the raised position, thus allowing axial, upward movement of the plug 1 from the closed position to the released position, as shown in Figure 3.When plug 1 rotates from the released position to the open tilted position, the second sector 17 of the lower ring 9 rotates in the opposite direction with respect to the first sector 16 and then returns to the lowered position. Furthermore, as described in more detail below, the second sector 17 also rotates with respect to the first sector 16 from the lowered position to the raised position when plug 1 rotates from the open tilted position to the released position. The lower ring 9 is held axially in the neck 2 of the container by means of the clamping collar 5. As shown in Figure 2, the clamping collar 5 has a truncated conical outer surface that narrows upwards, i.e., towards the opening 3 of the container. The clamping collar 5 defines, downwards, i.e., in a direction opposite to opening 3, a protrusion. As shown in Figure 4, the first section 16 of the lower ring 9 includes retaining elements 18 that cooperate with the retaining collar 5 formed on the container to axially retain the lower ring 9 to the neck 2 of the container. The retaining elements 18 are protrusions that project radially inward from the first section 16 of the lower ring 9. The retaining elements 18 have a radial dimension that increases from bottom to top, i.e., toward the upper edge of the lower ring 9. During assembly of the capping device on the neck 2 of the container, the retaining elements 18 slide against the truncated conical surface of the retaining collar 5 and are then locked by a spring behind the retaining collar 5. The first sector 16 of the lower ring 9 comprises a front zone 19 that is diametrically opposite the second sector 17 of the lower ring 9 and two clamping zones 20, one of which is shown in Figure 4. These clamping zones are arranged on either side of the front zone 19 and each is positioned between the front zone 19 and the second sector 17 of the lower ring 9. According to one embodiment, the clamping elements 18 are only arranged in the two clamping zones 20, 21. Thus, due to the absence of clamping elements 18 in the front zone of the first sector 16, there is radial play (hereafter designated as e4) between the lower ring 9 and the neck 2, allowing the lower ring 9 to move from front to back and vice versa. The radial play e4 between the lower ring 9 and the neck 2 in the front / back direction is, for example, between 0.5 and 1 mm.This facilitates the passage of a portion of the second sector 17 to each side of the clamping collar 5 during the movement of the second sector 17 between the lowered and raised positions. In other words, the pulling forces exerted on the lower ring 9 to allow the second sector 17 to pass to each side of the clamping collar 5 are reduced. In the embodiment shown, the articulation device 10 includes two plates 11, 12, particularly visible in Figure 4, which join the plug 1 and, more particularly, the outer peripheral skirt 14 of the plug 1 with the lower ring 9, and more particularly, with the second sector 17 of the lower ring 9. The plates 11, 12 are symmetrical to each other with respect to a plane of symmetry P, shown in Figures 8 and 9, which is vertical and passes through the X-axis. Returning to Figure 1, it can be seen that laminae 11 and 12 are joined to the outer peripheral skirt 14 in a toothed portion. Likewise, laminae 11 and 12 are advantageously joined to the second sector 17 of the lower ring 2 in a toothed portion. In other words, the laminae 11, 12 extend substantially above the lower limit of the outer peripheral skirt 9 and extend substantially below the upper limit of the lower ring 3. The locking device includes a heel 22, in particular visible in Figures 1, 5 and 6, which is formed in the outer peripheral skirt 14 of the plug 1. The heel 22 projects axially downwards, i.e., in the direction of the lower ring 9, from the outer peripheral skirt 14 of the plug 1. The heel 22 projects between the two plates 11, 12. The heel 22 consists of a strip 23 that extends circumferentially between the two plates 11, 12 and projects radially outwards from the heel 22. The locking device consists of a protruding portion 24 that projects axially upwards, i.e., towards the outer peripheral skirt 14 of the plug 1, from the second sector 17 of the lower ring 9. The protruding portion 24 also protrudes between the two plates 11, 12. As depicted in Figures 5 and 6, the slat 23 and the protruding portion 24 are arranged so that, when the plug 1 is in the open inclined position, the protruding portion 24 is provided sandwiched between the slat 23 and the clamping collar 5. In other words, when the plug is in the open inclined position, the slat 23 and the protruding portion 24 are in contact with each other in an area located in the plane of the clamping collar 5, and the protruding portion 24 is also in contact with the clamping collar 5. As shown respectively in Figures 8 and 9, the contact zone of the strip 23 with the protruding portion 24 is placed at a radial distance e1 from the intersection between the straight line passing through the upper ends of the sheets 11, 12 and the plane of symmetry P, and the contact zone of the protruding portion 24 with the strip 23 is placed at a radial distance e2 from the intersection between the straight line passing through the lower ends of the sheets 11, 12 and the plane of symmetry P. The dimension e1 is such that e1 > L - e2, where L is the length of the slats 11 and 12 in the initial state, when the plug is in the closed position. This ensures that the slat 23 makes contact with the protruding portion 24 and that the slats 11 and 12 are under tension when the plug 1 is in the open, tilted position. Additionally, e1> L - e2 + e3 + e4 with e3: the radial clearance between the protruding portion 24 and the clamping collar 5 and e4: the radial clearance between the lower ring 9 and the neck 2 along the forward / retract direction, i.e., along a radial direction to the X-axis and inscribed in the plane of symmetry P. Preferably, e1 = L - e2 + e3 + e4 + Δ with Δ between 0.05 and 2 mm, and is determined so that the protruding portion 24 comes into contact against the clamping collar 5 when the plug 1 is in the inclined open position. Furthermore, as shown in Figure 7, when the plug 1 is in the open inclined position, the upper edge of the contact surface of the strip 23 extends axially below the upper end of the sheets 11, 12 by a distance d1, the upper edge of the protruding portion 24 extends axially above the lower end of the sheets 11, 12 by a distance d2, and the upper edge of the retaining collar 5 extends axially above the lower end of the sheets 11, 12 by a distance d3. Advantageously, the distance d1 is less than d2 and d3. The kinematics of plug 1 are as follows. During the first unscrewing, plug 1 leaves the closed position and moves away from the lower ring 9 to the released position, illustrated in Figure 3. The frangible bridges break during this movement. Additionally, during this unscrewing movement of plug 1, the lower ring 9 is dragged in rotation about the X-axis, and the second sector 17 of the lower ring 9 rotates to the raised position as plug 1 moves away from the retaining collar 5. Next, the plug 1 can then be rotated backward in the direction of the open tilted position in which the outer peripheral skirt 14 extends upward from the upper wall 13. During the movement of the plug 1 backward in the direction of its open tilted position, the slat 23 rests against the projecting portion 24 and thereby causes the second sector 17 of the lower ring 9 to pivot from the raised position to the lowered position. The stretching capabilities of the slats 11 and 10, along with the previously mentioned characteristics of the locking device, allow for the creation of a hard point during the tilting of the plug 1 between the released position, shown in Figure 3, and the open tilted position, shown in Figures 4 and 5. In other words, the slats 11 and 12, as well as the locking device, are configured such that, during the initial part of the plug 4's movement from the released position to the open tilted position, the two elastic slats 28 and 29 are subjected to a tensile force, due to the support of the strip 23 on the protruding portion 24. This force increases to an intermediate unstable position and then decreases from that unstable position to the open tilted position. This allows the plug 1 to be locked in the open tilted position. As depicted in Figures 5 and 6, when the second sector 17 of the lower ring 9 is in the lowered position and the plug 1 is in its open inclined position, the slat 23 rests against the protruding portion 24, which is thus sandwiched between said slat 23 and the retaining collar 5. Thus, plug 1 remains in its open inclined position since, due to the aforementioned arrangement, plug 1 cannot rotate to the released position in which plug 1 is facing the distribution hole 3 while the second sector 17 of the lower ring 9 remains in the lowered position. Advantageously, when plug 1 is in its open inclined position and the second sector 17 of the lower ring 9 is in the lowered position, the opening angle of plug 1 is greater than 120° and, advantageously, greater than or equal to 145° and, for example, on the order of 180°. The opening angle corresponds to the projecting angular sector formed at the intersection between a plane parallel to the upper wall 13 of plug 1 and a horizontal plane. To close plug 1 again, the user tilts plug 1 forward to the released position. During this tilting, the contact between the strip 23 and the protruding portion 24 disappears, allowing the second sector 17 of the lower ring 9 to move to the raised position. When the second sector 17 is in the raised position and the plug 1 is in the released position, the plug 1 can then be screwed back onto the neck 2 of the container. During screwing, the lower ring 9 is driven into rotation about the X-axis, and the second sector 17 of the lower ring 9 rotates to the lowered position as the plug 1 approaches the retaining collar 5. Advantageously, the entire capping device is molded as a single piece of synthetic material, such as polyethylene, and advantageously, high-density polyethylene. Advantageously, the capping device is molded in the configuration shown in Figure 1, i.e., in a closed position, a position in which it can be mounted directly onto the neck 2 of the container. Although the invention has been described in relation to several particular embodiments, it is quite clear that it is not limited in any way by them and that it comprises all the technical equivalents of the means described, as well as their combinations if these fall within the scope of the invention as defined by the claims. The use of the verbs "constant de", "comprender" or "incluir" and their conjugated forms does not exclude the presence of other elements or stages other than those established in a claim. In the claims, any reference sign in parentheses shall not be construed as a limitation of the claim.

Claims

1. Assembly comprising: - a container equipped with a neck (2), the neck (2) comprising a distribution hole (3), a helical thread (6) rotating about an X-axis provided on the neck (2), and a clamping collar (5), - a capping device comprising: - a lower ring (9) axially fixed to the neck (2) and rotatably movable on the neck (2) about said X-axis, said lower ring (9) comprising a first sector (16) comprising clamping elements (18) projecting radially into the lower ring (9) and arranged below the clamping collar (5) to axially retain the lower ring (9) on the neck (2) of the container, and a second sector (17),the first sector (16) and the second sector (17) of the lower ring (9) being articulated to each other such that the second sector (17) rotates with respect to the first sector (16) between a lowered position in which the second sector (17) is intended to be disposed below the clamping collar (5) and a raised position in which the second sector (17) is disposed at least partially above the clamping collar (5), - a plug (1) including an upper wall (13) and an external peripheral skirt (14), the external peripheral skirt (14) having a helical thread (7) intended to cooperate with the helical thread (6) of the neck (2) to allow displacement of the plug (1) between a closed position and a released position in which the helical thread (7) of the plug (1) is no longer coupled with the helical thread (6) of the neck (2); • the articulation device (10) consisting of two blades (11,12) connecting the outer peripheral skirt (14) and the second sector (17) and configured to allow the plug (1) to pivot between the released position and an open inclined position in which the plug (1) is released from the hole (3) in the neck (2); the second sector (17) of the lower ring (9) being suitable to be positioned in the lowered position when the plug (1) is in the open inclined position; the plugging device further comprising a locking device configured to lock the plug (1) in the open inclined position, said locking device comprising: • a heel (22) projecting axially from the outer peripheral skirt (14) between the two plates (11, 12) of the articulation device (10) and comprising a strip (23) projecting radially outward; and • a projecting portion (24) projecting axially from the second sector (17) of the lower ring (9) between the two plates (11,12) of the articulation device (10); • the slat (23) and the projecting portion (24) being configured such that, when the plug (1) is in its open inclined position and the second section of the lower ring (9) is in the lowered position, the projecting portion (24) is held between the slat (23) and the retaining collar (5).

2. Assembly according to claim 1, wherein e1> L- e2 with: L: the length of the sheets (11, 12) in an initial state in which the plug (1) is in the closed position; e1: a radial distance between a contact zone of the strip (23) intended to come into contact with the protruding portion (24) when the plug (1) is in the inclined open position and an intersection between a straight line passing through the upper ends of the sheets (11, 12) and a plane of symmetry (P) of the sheets (11, 12) relative to each other; and e2: a radial distance between a contact zone of the protruding portion (24) intended to come into contact with the strip (23) when the plug (1) is in the inclined open position and an intersection between a straight line passing through the lower ends of the sheets (11, 12) and the plane of symmetry (P).

3. Assembly according to claim 2, wherein e1> L - e2 + e3 + e4 with: e3: a radial clearance between the lower ring (9) and the neck (2) in a direction radial to the X axis and inscribed in the plane of symmetry P; and e4: a radial clearance between the protruding portion 24 and the retaining collar (5).

4. Assembly according to claim 3 wherein e1 = L - e2 + e3 + e4 + Δ with Δ between 0.05 and 2 mm.

5. Assembly according to any one of claims 1 to 4, wherein the projecting portion (24) extends beyond a lower limit of the outer peripheral skirt (14).

6. Assembly according to any one of claims 1 to 5, wherein the first sector (16) of the lower ring (9) comprises a front zone that is diametrically opposite the second sector (17) and two clamping zones that are each disposed between the front zone of the first sector (16) and the second sector (17), the clamping elements being disposed only in the two clamping zones to permit radial movement of the lower ring (9) suitable to facilitate the passage of a portion of the second sector (17) to each side of the clamping collar (5) during the movement of the second sector (17) between the lowered position and the released position.

7. Assembly according to any one of claims 1 to 6, wherein the sheets (11, 12) and the locking device are configured such that, during the pivoting movement of the plug (1) between the closed position and the open inclined position, the elastic sheets (11, 12) are subjected to a tensile force that increases to an intermediate unstable position and then decreases from said intermediate unstable position to the open inclined position.

8. Assembly according to any one of claims 1 to 7, wherein the capping device is molded in one piece.

9. Assembly according to any one of claims 1 to 8, wherein the lower ring (9) is connected to the outer peripheral skirt (14) by frangible bridges.

10. Assembly according to any one of claims 1 to 8, wherein when the plug (1) is in its open inclined position and the second sector (17) of the lower ring (9) is in the lowered position, the opening angle of the plug (1) is greater than 120° and.

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