ES2845226B2 - Capping device intended to be attached to the neck of a container - Google Patents

Description

DESCRIPTION

Capping device intended to be attached to the neck of a container

technical field

The invention relates to an assembly comprising a container and a capping device that is equipped with a cap and allows said cap to be kept fixed to the neck of a container, thus avoiding losing the cap altogether.

technological background

Document ES1232089U discloses a capping device that includes a lower ring intended to be fixed axially on the neck of a container, a cap that includes a thread intended to engage in a complementary thread formed on the neck of the container and a hinge that joins the cap with the bottom ring. The lower ring includes hooking means intended to retain the lower ring with the neck of the container. The section of the diameter of the lower ring in which there are hooking means extends between 25 and 75% of the diameter of the lower ring. The section of the lower ring which is connected to the cap by the hinge device lacks latching means allowing said section to rotate between a lowered position and a raised position, in particular to allow the cap to be unscrewed. Furthermore, the cap includes ratchet means intended to cooperate with the complementary ratchet means formed on the lower ring and therefore allows the cap to be held in a tilted-open position.

This capping device is not completely satisfactory. Indeed, despite the absence of latching means on the lower ring section which is connected to the plug by the hinge, the plug manipulations to allow the lower ring section which is connected to the plug to rotate into a raised position when the cap must move from the tilted open position to the closed position are not easy.

Summary

An underlying idea of the invention consists in proposing a capping device that allows to keep a cap attached to the neck of the container that is reliable, easy to make and use.

According to one embodiment, the invention provides a capping device intended to be attached to the neck of a container that includes a hole and a hooking collar, the capping device including:

- a cap including a top wall and an outer peripheral skirt, the outer peripheral skirt having a helical thread intended to cooperate with a helical thread formed on the neck to allow:

• an unscrewing of the plug from the neck around an axis X to move the plug from a closed position in which the top wall closes the orifice of the neck and the peripheral skirt surrounds said neck towards a released position in which the plug is no longer it is coupled with the neck; Y

• a screwing of the cap on the neck to move the cap from the released position to the closed position;

- a lower ring fixed axially to the neck and movable in rotation on the neck around said axis X, said lower ring including a first sector including engagement elements projecting radially towards the inside of the lower ring and intended to be arranged below of the latching collar to axially retain the lower ring in the neck of the container, the first sector and the second sector of the lower ring are hinged together such that the second sector rotates with respect to the first sector between a lowered position in which the second sector is intended to be disposed below the latching collar and a raised position in which the second sector is intended to be disposed at least partially above the latching collar;

- an articulation device that joins the plug to the second sector of the lower ring and is configured to allow the plug to rotate between the released position and an open tilted position in which the plug disengages from the hole in the neck, the articulation device is extends over a first angular interval that is cut into two equal parts by a bisector plane Pb;

- the lower ring is configured so that the second sector rotates with respect to the first sector from the lowered position to the raised position to allow the cap to move from the closed position to the released position;

- the lower ring can move radially from front to back to facilitate the passage of a part of the second sector on each side of the coupling collar during the movement of the second sector between the lowered position and the released position, the helical thread developing around the axis X according to a first direction and having a lower end and an upper end, the lower end of the helical thread is disposed in a second angular interval that is defined between the bisector plane Pb and a radial plane placed at 160° of the bisector plane Pb according to a second direction opposite to the first direction.

This facilitates engagement of the cap in the neck when moving the cap from the tilted open position towards the closed position.

According to other advantageous embodiments, such a capping device can have one or more of the following characteristics.

According to one embodiment, the lower end of the helical thread is arranged in an angular interval defined between two radial planes, respectively, positioned at 90° and 160° to the bisector plane Pb according to the second direction of rotation.

According to one embodiment, the first sector of the lower ring includes a front zone that is diametrically opposite the second sector and two hooking zones that are each arranged between the front zone of the first sector and the second sector, the hooking elements being arranged only in the two hooking areas to allow the radial movement of the lower ring. In this way, the traction forces that will be exerted on the lower ring to allow the second sector to move between the lowered position and the raised position are less, which facilitates the use of the capping device.

According to one embodiment, the front zone of the second sector extends over an angular range comprised between 90 and 150°.

According to one embodiment, each of the two hooking zones extends over an angular range of between 30 and 90°.

According to one embodiment, the two hooking zones extend over angular sectors that are symmetrical to each other with respect to the bisector plane Pb.

According to one embodiment, the hooking elements are protuberances projecting radially inwards.

According to one embodiment, the second sector extends over an angular range between 90 and 150°.

According to one embodiment, the hooking elements are protuberances projecting radially inwards.

According to one embodiment, the second sector does not have hooking elements.

According to one embodiment, the capping device further includes a locking device configured to lock the cap in the tilted-open position, said locking device including a stop projecting radially outward from the cap and configured to bear against the cap. collar for engaging the neck during movement of the cap from the tilted-open position to the released position to exert on the second sector, a traction force having a component directed radially outwards and a component directed axially upwards to aid movement of the second sector between the lowered position and the raised position. This makes it possible to further facilitate the use of the capping device, in particular when the cap is to be moved from the tilted-open position towards the closed position.

According to one embodiment, the stop is configured so that, during the movement of the cap from the released position towards the tilted open position, the stop rests against an upper end of the second sector of the lower ring to move it from the raised position towards the lowered position. This also makes it easier to use the capping device.

According to one embodiment, the locking device further includes a heel that is formed on the outer peripheral skirt of the cap and extends axially, the heel being configured to bear against a helical rib of the helical thread formed on the neck of the container during movement of the plug from the tilted open position towards the released position to exert on the second sector a tensile force having a radially outward directed component and an axially upward directed component to aid movement of the second sector from the lowered position to the raised position.

According to one embodiment, the stop protrudes radially outwards from the bead.

According to one embodiment, the articulation device includes two sheets and the heel is formed between the two sheets.

According to one embodiment, the articulation device includes two blades and the capping device also includes a device for locking the cap in the tilted-open position, said locking device including a stop that is formed on the outer peripheral skirt, between the two sheets of the articulation device, and which is configured to rest against the neck of the container when the cap is in the tilted-open position, the heel has an internal face on which at least one rib of the helical thread is formed. This makes it possible to improve the pressure resistance of the capping device.

According to one embodiment, the invention also relates to an assembly comprising a container equipped with a neck including a hole, a hooking collar and a helical thread and a capping device mentioned above, the lower ring being fixed axially to the neck and being mobile in rotation on the neck around said axis X.

Brief description of the figures

The invention will be better understood and other purposes, details, characteristics and advantages thereof will become more apparent in the following description of various particular embodiments of the invention, given solely by way of illustration and not limitation, with reference to the drawings. attachments.

Figure 1 is a three-quarter perspective view of a capping device.

Figure 2 is a sectional view of a container neck intended to receive the capping device of Figure 1.

Figure 3 is a side view of the stopper mounted on the container neck and showing the stopper stopper in a released position where it is no longer engaged with the container neck.

Figure 4 is a perspective view of the stopper mounted on the neck of the container and showing the stopper of the stopper in a tilted open position in which the stopper is disengaged from the hole in the neck.

Figure 5 is a side perspective view of the capping device.

Figure 6 is another side perspective view of the capping device.

Figure 7 is a rear perspective view of the capping device.

Figure 8 is a front perspective view of the capping device.

Figure 9 is a sectional view of the stopper mounted on the container neck and showing the stopper of the stopper in a tilted open position in which the stopper is disengaged from the hole in the neck.

Figure 10 is a sectional view of the capping device mounted on the container neck and showing the cap of the capping device in an intermediate position between the released position and the tilted open position.

Figure 11 is a perspective view of the capping device mounted on the container neck and showing the cap of the capping device in the tilted open position.

Detailed description of embodiments

In the description and the figures, the axis X corresponds to the axis of rotation of the cap 1 of the capping device when it is screwed onto the neck 2 of the container. By convention, "radial" orientation is directed orthogonal 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, for example 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 the neck 2 is oriented upwards and the plug 1 is in the closed position. in the neck 2 of the container, an element intended to be placed lower being called lower and an element intended to be placed higher being called upper. The terms "before" and "behind" are used to define the relative position of one element with respect to another along a diameter perpendicular to the X axis.

With reference to Figures 1 to 10, an assembly comprising a capping device, shown in particular in Figure 1, and a container equipped with a neck 2, shown in particular in Figure 1, is described below. two.

As shown in figure 2, the neck 2 of the container has an upper end in which a hole 3 is formed which allows the content of the container to be poured. The container neck 2 includes a radially outwardly projecting support collar 4 and an engagement collar 5 also radially outwardly projecting and which is axially disposed between the support collar 4 and the hole 3. A portion cylindrical is formed axially between the support collar 4 and the hole 3. On the other hand, the neck 2 includes, placed axially between the engagement collar 5 and the hole 3, a helical thread 6 formed by a series of helical ribs, projecting radially outwardly from an external surface of the neck 2. The helical thread 6 is intended to cooperate with a complementary helical thread 7 formed from a series of helical ribs which are formed on the cap 1 of the capping device.

According to one embodiment, the helical thread 6 formed on the neck 2, as well as the helical thread 7 formed on the cap 1, are interrupted. In other words, the adjacent helical ribs are separated by a space that forms a vent and that allows, in particular, to evacuate the gas present inside the container while the stopper 1 is still engaged in the neck 2.

The stopper device includes a lower ring 9 that is retained in the neck 2 of the container, a stopper 1 that is intended to cover the hole 3 of the container in order to close it, a hinge device 10 that joins the stopper 1 with the lower ring 9 and a locking device positioned to lock the cap 1 in a tilted-open position, shown in figures 4, 9 and 11. In the tilted-open position, the cap 1 is disengaged from the hole 3 of the container and does not hinder spilling the contents of the container.

As illustrated in figures 7 and 8, the articulation device 10 extends over an angular interval S1 which is cut into two equal parts by a vertical bisector plane Pb.

Returning to Figure 1, it can be seen that the cap 1 includes an upper wall 13 intended to be arranged substantially and orthogonally to the X axis, opposite the hole 3 of the neck 2 when said cap 1 is in the closed position. The cap 1 further includes an external peripheral skirt 14 intended to surround the neck 2 of the container when the cap 1 is in the closed position. The outer peripheral skirt 14 extends, downwards, perpendicular to the top wall 13, from the outer periphery of said top wall 13.

The external peripheral skirt 14 has, on its internal face, a helical thread 7, visible in figures 2 and 5 to 7, formed by a series of helical ribs that extend around the axis X according to a first direction of rotation. The helical thread 7 is intended to cooperate with the helical thread 6 formed on the external surface of the neck 2. In this way, the cap 1 is able to be screwed onto the neck 2 in order to close the container and to be unscrewed from the neck 2 in order to open the container. The stopper 1 can thus move between a closed position and a released position, represented in figure 3. In said released position, the stopper 1 is no longer coupled with the neck 2. It is therefore able to tilt towards the open tilted position, represented in figures 4, 9 and 11, in which the cap 1 is uncoupled from the hole 3 of the neck 2 so as not to hinder the pouring of the contents of the container.

As shown in particular in figure 9, the stopper 1 also includes an internal skirt 8, which extends perpendicularly downwards from the upper wall 13 of the stopper 1 and is dimensioned to be inserted inside the hole 3 of the neck 2. cap 1 also includes an annular lip 15 which extends, from top wall 13, radially between inner skirt 8 and outer peripheral skirt 14. Inner skirt 8 and annular lip 15 are dimensioned so that when cap 1 is in the closed position, in the neck 2 of the container, the internal skirt 8 is in contact with the internal face of the neck 2 while the annular lip 15 is in contact with the external face of the neck 2. In this way, the skirt internal 8 and the annular lip 15 allow to guarantee the tightness of the closure.

Advantageously, the lower ring 9 is, before the first opening of the container, connected to the cap 1 by frangible bridges, not visible in the figures, intended to break during the opening of the cap 1. These frangible bridges thus constitute inviolability seals.

The lower ring 9 is held axially in the neck 2 of the container while it can rotate with respect to it around the axis X. As shown in figure 3, the lower ring 9 includes two parts that are hinged to each other, i.e. a first sector 16 and a second sector 17 by which the lower ring 9 is connected to the cap 1 by means of the hinge device 10.

According to one embodiment, the lower ring 9 includes two tapered zones, that is, whose radial thickness is less than the radial thickness of the lower ring 9 outside said tapered zones. The two narrowed areas delimit the first sector 16 and the second sector 17. The narrowed areas 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 areas delimiting the first and second sectors 16, 17.

The second sector 17 is able to rotate upwards with respect to the first sector 16, between a lowered position in which the second sector 17 is intended to be arranged below the coupling collar 5 and a raised position, in which the second sector 17 is arranged at least in part above the latching collar 5. This allows the cap 1 to move upwards with respect to the neck 2 of the container, until the helical thread 7 of the cap 1 disengages from the helical thread 6 formed in the neck 2 of the container. In other words, when the cap 1 is unscrewed, the lower ring 9 is dragged in rotation around the axis X while the second sector 17 of the lower ring 9 rotates with respect to the first sector 16 to the raised position to allow axial movement, upwards of the cap 1, from the closed position, to the released position, represented in figure 3. When the cap 1 rotates from the released position towards the tilted open position, the second sector 17 of the lower ring 9 rotates in the direction opposite to the first sector 16 and then returns to the lowered position. On the other hand, 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 the cap 1 rotates from the tilted-open position to the released position.

The lower ring 9 is held axially on the neck 2 of the container by means of the latching collar 5, in particular, visible in figures 5 to 7. The latching collar 5 has a frustoconical external surface that narrows upwards, that is to say , in the direction of hole 3 of the container. The hooking collar 5 delimits, downwards, that is, in a direction opposite to the hole 3, a projection. The first sector 16 of the lower ring 9 includes hooking elements 18 that cooperate with the hooking collar 5 formed in the container in order to axially retain the lower ring 9 to the neck 2 of the container. The hooking elements 18 are protuberances, shown in detail in particular in figures 5 and 6, which protrude radially inwards from the first sector 16 of the lower ring 9. The retaining elements 18 have a radial dimension that increases, from below upwards, that is, in the direction of the upper edge of the lower ring 9. During the assembly of the capping device on the neck 2 of the container, the latching elements 18 slide against the frustoconical surface of the latching collar 5 and then lock by means of an elastic return behind the coupling collar 5.

As shown in figures 5 and 6, the first sector 16 of the lower ring 9 includes a front area 19 that is diametrically opposite the second sector 17 of the lower ring 9 and two engagement areas 20, 21 that are arranged on each side of the front zone 19 and are each arranged between the front zone 19 and the second sector 17 of the lower ring 9. The hooking elements 18 are only arranged in the two hooking zones 20, 21. In this way, due to the absence of hooking elements 18 in the front area of the first sector 16, there is a radial space between the lower ring 9 and the neck 2 that allows the lower ring 9 to move from front to back and vice versa. The radial clearance between the lower ring 9 and the neck 2 in the forward/rear direction is, for example, between 0.5 and 1 mm. This facilitates the passage of a part of the second sector 17 on each side of the engagement collar 5 during the movement of the second sector 17 between the lowered position and the raised position. In other words, the traction forces that will be exerted on the lower ring 9 to allow the second sector 17 to pass on each side of the engagement collar 5 are less.

Advantageously, the second sector 17 extends over an angular range of between 90 and 150°, and for example, of the order of 120°, the front area of the second sector 16 extends over an angular range of between 90 and 150°. , for example, of the order of 120°, while each of the two engagement zones 20, 21 extends over an angular range comprised between 30 and 90°, for example of the order of 60°.

On the other hand, the bisector plane Pb cuts the second sector 17, as well as the front part of the second sector 17, into two equal parts. The angular intervals corresponding to the two coupling zones 20, 21 are therefore symmetrical with each other with respect to the bisector plane Pb.

The articulation device 10 is configured to allow the plug 1 to rotate between the released position, shown in figure 3, in which the outer peripheral skirt 14 is extends downwardly from the top wall 13 of the cap 1, and the tilted-open position, shown in Figures 4, 9 and 11, in which the outer peripheral skirt 14 extends upwardly from the top wall 13 of the cap 1. In In the embodiment shown, the articulation device 10 includes two plates 11, 12, visible in particular in FIG. 4, which join the cap 1 and, more particularly, the outer peripheral skirt 14 of the cap 1 with the lower ring 9, and more particularly, with the second sector 17 of the lower ring 9. The two sheets 11, 12 are symmetrical with respect to the bisector plane Pb.

The locking device includes a bead 22, in particular visible in Figure 1, which is formed on the outer peripheral skirt 14 of the cap 1. The bead 22 is arranged between the two sheets 11, 12. The lower end of the bead 22 it is advantageously located at the same height as the lower end of the outer peripheral skirt 14. The bead 22 includes a stop 23 extending circumferentially about axis X and projecting radially outwardly from the bead 22.

During the movement of the cap 1 from the released position towards the tilted open position, the stop 23 bears against the upper end of the second sector 17 of the lower ring 9 which tends to return said second sector 17 towards the lowered position.

On the other hand, during the movement of the cap 1 from the open tilted position towards the released position, at first, the stop 23 bears against the hooking collar 5, as shown in figure 10, to exert on the second sector 17 of the lower ring 9 a tensile force having a component directed radially outwards and a component directed axially upwards. This allows moving the lower ring 9 from front to back to press the front area 19 of the first sector 16 of the lower ring 9 against the neck 2 of the container in order to facilitate the movement of the second sector 17 towards the raised position. This also makes it possible to assist the movement of the second sector 17 between the lowered position and the raised position.

Then, as shown in figure 10, during the movement of the plug 1 from the open tilted position towards the released position, the outer surface of the bead 22 comes in a second moment, resting against the upper surface of a helical rib of the thread. helical 6 formed in the neck 2 of the container, which also allows exerting on the second sector 17 a traction force having a component directed radially outwards and a component directed upwards to move the second sector 17 towards the raised position.

On the other hand, as shown in Fig. 11, the lower end 24 of the helical thread 7 formed on the inner face of the outer peripheral skirt 14, that is, the beginning of the helical thread 7, is arranged in an angular range S2 which is defined between the bisector plane Pb and a radial plane Pr located at 160° to the bisector plane Pb according to a second direction opposite to the first direction of rotation, that is, in the direction of rotation of the helical thread 7 about the axis X. Thus, a lower front part 25 of the outer peripheral skirt 14 lacks a helical thread 7, which makes it easier to fit the cap 1 to the neck 2 of the container. This arrangement is particularly advantageous when the stopper 1 is capable of being presented in a slightly rearwardly displaced position when it comes into contact with the neck 2 of the container. This is particularly the case, when the latching elements 18 are absent from the front area 19 of the first sector 16 and that, consequently, the lower ring 9 can move radially from front to back with respect to the neck 2 of the container.

Advantageously, the lower end of the helical thread 7 is arranged in an angular interval defined between two radial planes respectively positioned at 90° and 160° to the bisector plane Pb according to a second direction of rotation opposite to the direction of the thread. helical 7 of plug 1.

On the other hand, as schematically shown in Figures 8, 9 and 10, at least one of the ribs of the series of ribs of the helical thread 7 is formed on the inner face of the butt 22. In other words, at least one of the ribs of the helical thread 7 is formed between the two plates 11, 12 of the articulation device 10. The presence of said rib formed on the heel 22 makes it possible to increase the pressure resistance of the helical thread 7 and, therefore, Thus, it prevents the stopper 1 from opening unintentionally due to excessive pressure in the container, in particular, when it is intended to receive carbonated beverages.

The kinematics of cap 1 is as follows. During the first unscrewing, the cap 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. Furthermore, during this unscrewing movement of the cap 1, the lower ring 9 is dragged in rotation about the axis X and the second sector 17 of the lower ring 9 rotates towards the raised position as the cap 1 moves away from the hooking collar 5 .

Subsequently, the cap 1 can then be rotated backwards in the direction of the tilted open position in which the outer peripheral skirt 14 extends upwardly from the top wall 13. During the movement of the cap 1 backwards in the direction of its position tilted open, the stop 23 bears against the upper end of the second sector 17 of the lower ring 9, so that the second sector 17 of the lower ring 9 rotates from the raised position towards the lowered position.

As shown in figure 9, when the second sector 17 of the lower ring 9 is in the lowered position and the cap 1 is in its tilted open position, the stop 23 is supported against the hooking collar 5. In this way, the cap 1 remains in its open tilted position since, due to this support of the stop 23 against the hooking collar 5, the cap 1 cannot rotate towards the released position in which the cap 1 faces the dispensing hole 3 while the second sector 17 of the lower ring 9 remains in the lowered position. This makes it possible to increase the minimum opening angle of the cap 1. In this way, advantageously, when the cap 1 is in its open tilted position and the second sector 17 of the lower ring 9 is in the lowered position, the opening angle of the stopper 1 is greater than 120° and, advantageously, greater than or equal to 145° and, for example, of the order of 180°. The opening angle corresponds to the projecting angular sector that is formed at the intersection between a plane parallel to the upper wall 13 of the cap 1 and a horizontal plane.

To close the cap 1 again, the user tilts the cap 1 forward to the released position. During this tilting, the stop 23 bears against the hooking collar 5 in order to exert on the second sector 17 of the lower ring 9 a traction force having a component directed radially outwards that makes it possible to move the lower ring 9 from the front to the rear. backwards and a component directed axially upwards that allows assisting the movement of the second sector 17 of the lower ring 9 towards the raised position. The outer surface of the bead 22 also bears against a helical rib of the helical thread 6 which also facilitates the movement of the second sector 17 of the lower ring 9 towards the raised position.

When the second sector 17 is in the raised position and the cap 1 is in the released position, said cap 1 can then be screwed back onto the neck 2 of the container. During screwing, the lower ring 9 is driven in rotation about the axis X and the second sector 17 of the lower ring 9 rotates towards the lowered position as the plug 1 is close to the engagement collar 5.

Advantageously, the capping device assembly is molded in one piece of synthetic material, such as polyethylene and advantageously high-density polyethylene. Advantageously, the stopper device is molded in the configuration of Figure 1, ie in a closed position, a position in which it can be mounted directly on the neck 2 of the container.

Although the invention has been described in relation to several particular embodiments, it is more than evident that it is not limited in any way by them and that it includes all the technical equivalents of the means described, as well as their combinations if they come into play. the scope of the invention as defined by the claims.

The use of the verb "consist of", "comprehend" or "include" and its conjugated forms do not exclude the presence of other elements or stages other than those established in a claim.

In the claims, any reference signs in parentheses are not to be construed as limiting the claim.

Claims (12)

I. Capping device intended to be fixed on a neck (2) of a container that includes a hole (3) and a hooking collar (5), including the capping device: - a cap (1) including a top wall (13) and an outer peripheral skirt (14), the outer peripheral skirt (14) having a helical thread (7) intended to cooperate with a helical thread (6) formed in the collar (2) to allow: • an unscrewing of the cap (1) from the neck (2) around an axis X to move the cap (1) from a closed position in which the upper wall (13) closes the hole (3) of the neck (2) and the peripheral skirt surrounds said neck (2) towards a released position in which the plug (1) is no longer engaged with the neck (2); Y • a screwing of the cap (1) in the neck (2) to move the cap (1) from the released position towards the closed position; - a lower ring (9) fixed axially to the neck (2) and movable in rotation on the neck (2) around said axis X, said lower ring (9) including a first sector (16) including hooking elements (18 ) that project radially inwards from the lower ring (9) and are intended to be arranged below the hooking collar (5) to axially retain the lower ring (9) in the neck (2) of the container, the first sector being ( 16) and the second sector (17) of the lower ring (9) articulated with each other so 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 arranged below the hooking collar (5) and a raised position in which the second sector (17) is intended to be arranged at least partially above the hooking collar (5); - an articulation device that joins the cap (1) to the second sector (17) of the lower ring (9) and is configured to allow the cap (1) to rotate between the released position and an open tilted position in which the cap (1) is uncoupled from the hole (3) of the neck (2), the articulation device extends over a first angular interval that is cut into two equal parts by a bisector plane Pb; - the lower ring (9) being configured so that the second sector (17) rotates with respect to the first sector (16) from the lowered position to the raised position to allow the cap (1) to move from the closed position to the released position; - the lower ring (9) being able to move radially from front to back to facilitate the passage of a part of the second sector (17) on each side of the coupling collar (5) during the movement of the second sector (17) between the lowered position and released position, the helical thread (7) developing around the axis X according to a first direction and having a lower end and an upper end, the lower end of the helical thread (7) being disposed in a second angular interval that is defined between the bisector plane Pb and a radial plane placed at 160° to the bisector plane Pb according to a second direction opposite to the first direction. 2. Capping device according to claim 1, in which the lower end of the helical thread (7) is arranged in an angular interval defined between two radial planes, respectively, positioned at 90° and 160° to the bisector plane Pb according to the second direction of rotation. 3. Capping device according to claim 1 or 2, in which the first sector (16) of the lower ring (9) includes a front area (19) that is diametrically opposite the second sector (17) and two hooking areas (20). , 21) that are each arranged between the front area (19) of the first sector (16) and the second sector (17), the hooking elements (18) being arranged only in the two hooking zones (20, 21) to allow radial movement of the lower ring (9). 4. Capping device according to claim 3, in which the front area (19) of the first sector (16) extends over an angular range between 90 and 150°. 5. Capping device according to claim 3 or 4, in which each of the two hooking zones (20, 21) extends over an angular range between 30 and 90°. 6. Capping device according to any one of claims 3 to 5, in which the two hooking zones (20, 21) extend over angular sectors that are symmetrical to each other with respect to the bisector plane Pb. Capping device according to any one of claims 1 to 6, in which the hooking elements (18) are protuberances projecting radially inwards. 8. Capping device according to any one of claims 1 to 7, in which the second sector (17) extends over an angular range between 90 and 150°. 9. Capping device according to any one of claims 1 to 8, wherein the capping device further includes a locking device configured to lock the cap (1) in the tilted-open position, said locking device including a stop ( 23) projecting radially towards the outside of the cap (1) and configured to rest against the hooking collar (5) of the neck (2) during the movement of the cap (1) from the tilted open position towards the released position for exerting on the second sector (17) a traction force having a radially outwardly directed component and an axially upwardly directed component to assist the movement of the second sector (17) between the lowered position towards the raised position. 10. Capping device according to claim 9, in which the stop (23) is configured so that, during the movement of the cap (1) from the released position towards the tilted-open position, the stop (23) abuts against a upper end of the second sector (17) of the lower ring (9) to move it from the raised position to the lowered position. 11. Capping device according to claim 9 or 10, wherein the blocking device further includes a bead (22) which is formed on the outer peripheral skirt (14) of the cap (1) and extends axially, the bead being (22) configured to bear against a helical rib of the helical thread (6) formed in the neck (2) of the container during the movement of the cap (1) from the open tilted position towards the released position to exert on the second sector (17) a traction force having a radially outwardly directed component and an axially upwardly directed component to aid movement of the second sector (17) from the lowered position to the raised position. 12. Assembly comprising a container equipped with a neck (2) including a dispensing orifice (3), a hooking collar (5) and a helical thread (6) and a capping device according to any one of claims 1 to 11, the lower ring (9) being fixed axially to the neck (2) and movable in rotation on the neck (2) around said axis X.