EP2889232B1 - Hinged closure device with first-opening indicator - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION

The invention relates to a closure device, according to the preamble of claim 1, at least two parts, comprising a base having a function of attachment to a container neck and / or a pourer function, and a cap hinged to this base.

STATE OF THE PRIOR ART

Knuckles are known in one, two or three plastic parts, commonly called sports caps, allowing a consumer to directly drink the contents of a container and close it. In the document WO 2004/007313 is illustrated a plug of this type made in two parts, with a first piece constituting both a mounting base on a container neck and a pourer allowing a plug in the mouth, and a second piece forming a cap to cover and seal the pourer, the second piece further comprising a fixing ring and a flexible hinge strap connecting the fastening ring to the cap. An advantage of this type of cap is that it can be manufactured in closed position, that is to say without closing operation by pivoting the cap on its joint, the assembly of the two parts being made by a simple movement of translation, during which the ring is inserted by its lower part in a fixing groove provided for this purpose in the base. The ring is also provided in its upper part with one or more indentations each receiving a first opening indicator linked on the one hand to the bottom of the notch and on the other hand to a rim of the cap. The desired effect is to achieve, upon opening, a rupture of the first opening indicator in two parts, one connected to the cap and the other to the ring, and, by a displacement or a deformation of the at least one of these two parts, to make the opening detectable by the consumer. In practice, however, it proves difficult, on small plugs, to obtain a displacement or deformation detectable by the consumer. This is the reason why for its marketing, this plug has been provided with a breakable tongue acting as a first opening witness. Care must be taken to ensure that this breakable tongue does not separate from the plug after opening, which would be detrimental from the point of view of respect for the environment.

In the document EP 1 892 194 has been proposed a sports cap in two parts, namely a first part forming a base and a cap hinged to the base by a hinge, and a second piece constituting a pourer inserted into the base. This plug can also be manufactured in closed position, by axial assembly of the two parts. An annular dead volume is preserved between the two assembled parts, which volume is used to house, after opening, a first opening indicator which separates from a peripheral wall of the cap. For a good assembly preserving this annular dead volume, it is necessary to provide abutments protruding axially from the bottom of the base and against which is positioned the pourer. This again results in significant axial space. In addition, the disappearance of the first opening witness does not necessarily allow a consumer unfamiliar with the plug in question, to visually recognize if it has already been opened. Finally, the fact that the base and the cap belong to the same room limits the variations in color and material for the visible portion externally, except to manufacture this piece by bi-injection, which increases the cost.

In the document WO2007 / 006892 is described a plug comprising a first piece and a second piece, rigidly associated with each other. The first piece forms a peripheral base and a pouring means. It also includes first peripheral attachment means for the second part. The second part forms a cover, means for pivoting the cover and second peripheral means of attachment complementary to the first attachment means, these second means being constituted by a ring. The cap thus comprises two parts, one that can be described as fixed - in that it is fixed rigidly on the neck of the container - and the other that can be described as mobile, associated with the to one another by the pivoting means. The fixed part comprises the first part and the ring, while the movable part is formed of the only cover. The cap also comprises external means ensuring the inviolability before a first opening, interposed between the fixed part and the movable part. These means are made in the form of frangible bridges, connecting a lower free edge of the bonnet skirt to an adjacent upper edge of the ring. Frangible bridges are designed to be broken when, when the hood is first opened, the user pulls axially up on the hood opposite the pivoting means. According to another embodiment, the frangible bridges can be replaced by a line or a zone of lower resistance. In practice, the change of state of the inviolability means is not very visible when the cover, after first opening, is brought back to the closed position. The consumer must therefore rely on the resistance of the cap before the first opening to detect the condition of the cap.

STATEMENT OF THE INVENTION

The invention aims to remedy all or part of the disadvantages of the state of the art identified above.

To do this is proposed according to a first aspect of the invention a closure device to be secured to a container neck, the closure device comprising: a first piece forming a base for attachment to the container neck and having a peripheral fixing groove ; and a second cap member, an attachment ring defining a reference geometric axis, and a hinge connecting the attachment ring to the cap for guiding the cap relative to the ring between a closed position and an open position, fixing ring being engaged by snapping into the fastening groove of the first part. The second part also forms a first opening indicator and a breakable connection between the first opening indicator and a peripheral rim of the cap, a free space being preserved in the axial direction between the ring and the first opening indicator in the closed position before first opening, the first opening indicator being retained by at least one attachment zone of the first part so as to be separated from the cap and fall into the free space during the first opening.

The closure device thus defined can be manufactured in closed position by axial assembly, and offers a very good visibility of the first opening indicator, while avoiding that the first opening indicator is separated from the closure device following the opening.

The two pieces, which in practice are made of plastic material, can be made, if necessary, with different materials, for example more flexible for the base and more rigid for the cap. It is also possible to choose different colors for the two pieces, which facilitates the display of the first opening indicator and, by providing several color combinations, makes it possible to identify different drinks of a given range, each by a given pair of colors. . One of the two pieces can be transparent.

The peripheral groove is preferably annular and the ring closed, so as to maximize the contact surfaces between the ring and groove, and thus promote good snap fastening, without requiring dimensional tolerances and expensive assembly to be complied with in industrial conditions. .

Preferably, the first piece is shaped so as to make visible in the closed position before first opening the first opening indicator and the free space. Thus the first opening indicator is visible before and after the first opening, so that the consumer, even if he is not familiar with the closure device, can not be mistaken about its condition. More specifically, the first-opening indicator has a face turned radially outward, visible before first opening and remaining fully visible after first opening. No other surface of the first aperture indicator turned radially outward and which would be invisible before first opening, will not appear after the first opening. It is thus essentially the release and the displacement of the first opening witness that make it possible to identify that the first opening has taken place.

According to one embodiment, the first part comprises at least two attachment zones and at least one visual notch separating the two attachment zones, making visible in the closed position before first opening the first opening indicator and the space free.

According to one embodiment, the attachment zones are in number greater than two, are distributed preferably over the entire periphery of the first part, preferably regularly spaced and are separated in pairs by notches, at least one of which is a notch of visualization making visible the witness of first opening and the free space, before first opening. This eliminates an angular indexing stress of the first part relative to the second part during assembly. Preferably, the indentations have arc length greater than the attachment zones that they separate, for a good visualization of the first opening indicator

Preferably, the attachment zone or zones oppose extraction of the first opening control from the free space after first opening, which avoids any risk of ingestion of the first opening control by a child, and all risk of pollution.

According to one embodiment, the first-opening indicator has an arcuate shape around the reference axis. The angle covered by this arc can be important, which is favorable for good visualization. According to one embodiment, the circular arc runs over an angular sector greater than 45 °, preferably greater than 60 °, and preferably less than 180 °, for example of the order of 60 °, 90 ° or 120 °. According to another embodiment, the circular arc runs over an angular sector greater than 180 °, preferably from a first lateral edge of the hinge to a second opposite lateral edge of the hinge. Naturally, angles smaller than 45 ° are also possible, for example of the order of 30 °, and especially if the shape, size and / or color of the witness allows a good visualization of the change of position.

Preferably, the hinge is a reactive hinge, stable at least in the open position, which facilitates use in the open position, in particular for drinking directly to the container, but also for pouring the contents of the container without the risk of the cap closing up. . Preferably, the hinge has at least two stable positions, respectively corresponding to the open position and the closed position of the cap, which also promotes good closure of the cap.

According to one embodiment, the hinge comprises a strip of material connected by an upper end to a coupling zone of the cap and by a lower end to the ring, and opposite side edges facing corresponding lateral edges of the cap. Preferably, the hinge in the closed position is not protruding from a peripheral wall of the cap. Because it is not protruding from the cap in the closed position, the hinge can not be damaged by handling shocks. In addition, it does not offer a plug to dust or other pollution during storage.

The cap preferably has a protruding tongue radially outwardly, radially opposite the hinge, to facilitate opening. Preferably, this tongue remains inside a cylinder tangential to an outer periphery of the ring, to prevent it receives shocks during handling and storage. Preferably, this tongue is disposed in an upper zone located in closed position opposite the ring relative to a plane perpendicular to the reference axis and not cutting the hinge.

The cap has a top wall preferably flat and a height measured in the closed position between a lower peripheral rim of the cap and the top wall, the height preferably being smaller than the outer diameter of the ring, preferably less than 2/3 of the outer diameter of the ring.

According to a preferred embodiment, the first part forms an axially projecting spout relative to the attachment groove, the spout preferably having an outer surface having a symmetry of revolution about the reference axis. In this case, the cap preferably has an inner sealing skirt, which comes into elastic interference with an inner or outer face of the spout.

Preferably, the closure device consists only of the two parts defined above, although it may be envisaged alternatively a third part, for example a resilient valve disposed in an opening of the base or its pourer , or a pourer reported. Where appropriate, there is provided on the base a witness to identify an attempt to separate the base and the neck of the container.

BRIEF DESCRIPTION OF THE FIGURES

• la figure 1, une vue isométrique d'un dispositif de bouchage en deux pièces, après assemblage et en position fermée avant une première ouverture, selon un premier mode de réalisation de l'invention;
• la figure 2, une vue isométrique du dispositif de bouchage de la figure 1, en position ouverture;
• la figure 3, une vue de derrière des deux pièces du dispositif de bouchage de la figure 1, avant assemblage;
• la figure 4, une vue de côté des deux pièces du dispositif de bouchage de la figure 1, avant assemblage;
• la figure 5, une vue en coupe d'un détail du dispositif de bouchage de la figure 1, en position fermée avant première ouverture;
• la figure 6, une vue en coupe d'un détail du dispositif de bouchage de la figure 1, en position fermée avant première ouverture;
• la figure 7, une vue dans le plan de coupe de la figure 5 d'un détail du dispositif de bouchage de la figure 1, en position refermée après première ouverture;
• la figure 8, une vue dans le plan de coupe de la figure 6 d'un détail du dispositif de bouchage de la figure 1, en position refermée après première ouverture;
• la figure 9, une vue isométrique d'un dispositif de bouchage en deux pièces selon un deuxième mode de réalisation de l'invention, avant assemblage en position fermée;
• la figure 10, une vue isométrique du dispositif de bouchage de la figure 9, après assemblage, en position fermée, avant première ouverture;
• la figure 11, une vue isométrique du dispositif de bouchage de la figure 9, en position ouverte;
• la figure 12, une en coupe d'un détail du dispositif de bouchage de la figure 9, en position fermée avant première ouverture;
• la figure 13, une vue en coupe d'un détail du dispositif de bouchage de la figure 9, en position fermée avant première ouverture;
• la figure 14, une vue en coupe d'un détail du dispositif de bouchage de la figure 9, en position fermée avant première ouverture;
• la figure 15, une vue dans le plan de coupe de la figure 12 d'un détail du dispositif de bouchage de la figure 9, en position refermée après première ouverture;
• la figure 16, une vue dans le plan de coupe de la figure 13 d'un détail du dispositif de bouchage de la figure 9, en position refermée après première ouverture;
• la figure 17, une vue dans le plan de coupe de la figure 14 d'un détail du dispositif de bouchage de la figure 9, en position refermée après première ouverture;

Other characteristics and advantages of the invention will emerge on reading the description which follows, with reference to the appended figures, which illustrate:

• the figure 1 an isometric view of a closure device in two parts, after assembly and in closed position before a first opening, according to a first embodiment of the invention;
• the figure 2 , an isometric view of the closure device of the figure 1 , in the open position;
• the figure 3 , a view from behind of the two parts of the closure device of the figure 1 before assembly;
• the figure 4 , a side view of the two parts of the closure device of the figure 1 before assembly;
• the figure 5 , a sectional view of a detail of the closure device of the figure 1 , in the closed position before first opening;
• the figure 6 , a sectional view of a detail of the closure device of the figure 1 , in the closed position before first opening;
• the figure 7 , a view in the section plane of the figure 5 a detail of the closure device of the figure 1 , in the closed position after first opening;
• the figure 8 , a view in the section plane of the figure 6 a detail of the closure device of the figure 1 , in the closed position after first opening;
• the figure 9 , an isometric view of a two-piece closure device according to a second embodiment of the invention, before assembly in the closed position;
• the figure 10 , an isometric view of the closure device of the figure 9 , after assembly, in the closed position, before first opening;
• the figure 11 , an isometric view of the closure device of the figure 9 , in the open position;
• the figure 12 , a section of a detail of the closure device of the figure 9 , in the closed position before first opening;
• the figure 13 , a sectional view of a detail of the closure device of the figure 9 , in the closed position before first opening;
• the figure 14 , a sectional view of a detail of the closure device of the figure 9 , in the closed position before first opening;
• the figure 15 , a view in the section plane of the figure 12 a detail of the closure device of the figure 9 , in the closed position after first opening;
• the figure 16 , a view in the section plane of the figure 13 a detail of the closure device of the figure 9 , in the closed position after first opening;
• the figure 17 , a view in the section plane of the figure 14 a detail of the closure device of the figure 9 , in the closed position after first opening;

For the sake of clarity, identical or similar elements are marked with identical reference signs throughout the figures.

DETAILED DESCRIPTION OF AN EMBODIMENT

The closure device 10 shown on the Figures 1 to 8 consists of two pieces 12, 14 made of plastic material and assembled to one another.

The first piece 12 comprises a base 16 provided with a relief (not shown) for attachment to a container, which may be constituted for example, and in known manner, one or more threads for screwing the base to a collar of container. This base 16 may optionally, in a manner also known, be equipped at its lower end with a tamper evident ring cooperating with the collar of the container to make visible any attempt to separate the first part and the neck of the container. The first piece 12 further comprises a pourer 18 protruding axially with respect to the base 16, this pourer here having an outer surface having a symmetry of revolution about a reference axis 100 of the first piece 12, and a central opening 19.

The first piece 12 furthermore has an annular peripheral fixing groove 20 visible on the Figures 5 to 8 , formed in the base and surrounding the pourer 18. This groove 20 is partially closed by an annular attachment relief 22 projecting radially inwardly of the groove 20 and to the pourer 18.

The first piece 12 further has retaining tabs 24, here six in number, separated in pairs by notches 26, and protruding from the base 12 in the axial direction facing and at a short distance from a cylindrical wall 28 of the pourer 18. Each of the retaining tongues 24 forms a hooking area with a hook 30 projecting radially inwards and towards the pourer 18.

The second piece 14 forms a cap 32, a closed fixing ring 34 defining a reference axis 200 and a hinge 36 connecting the fixing ring 34 to the cap 32 to guide the cap 32 relative to the ring 34 between a position closed illustrated on the figure 1 , and an open position illustrated on the figure 2 , by rotation about an orthoradial axis 300 with respect to the reference axis 200. The cap 32 has a preferably planar top wall 38 and a peripheral wall 40. The inner face of the top wall can be provided with known, a sealing skirt (not shown), coming into axial contact or preferably radial with an inner or outer wall of the opening 19. The cap 32 has a height H, measured in the closed position between a peripheral rim lower 42 of the peripheral wall 40 and the top wall 38, which in this embodiment is smaller than the outer diameter D of the ring 34, and in this case less than 2/3 of the outer diameter of the ring . The top wall forms a tongue 44 projecting radially outwards, radially opposite the hinge 36. This tongue 44 is preferably located inside a cylinder tangential to an outer periphery of the ring. 34, from preferably in an upper zone located in closed position opposite the ring and the hinge 36 with respect to a plane perpendicular to the reference axis 200.

The hinge 36 comprises a strip of material connected by an upper end to a connecting zone of the cap 32 and by a lower end to the ring 34, and opposite lateral edges 46, 48 facing corresponding lateral flanges of the cap 32. In at least one region located axially between on the one hand a first plane perpendicular to the reference axis 200 and cutting the upper end of the strip and on the other hand a second plane perpendicular to the reference axis 200 and cutting the lower end of the strip, and extending angularly around the reference axis at 60 ° on either side of the side edges of the strip, the hinge and the cap in the closed position have a common outer envelope, which is to say that the hinge is not protruding from the adjacent surface of the peripheral wall of the cap.

It is possible to define a geometrical plane P perpendicular to the reference axis 200 situated between the top wall 38 and the ring 34, and below which the peripheral wall 40 has a spherical outer envelope or more generally constituted by a surface of revolution. around the reference axis 200, in particular a surface of revolution having a generatrix having a concavity turned towards the axis of revolution 200. This plane P is preferably located above the hinge 36, between the latter and the wall top plate 38. Preferably, the peripheral wall 40 of the cap, at its lower end, is tangent or substantially tangential to a cylinder of revolution about the reference axis 200.

The second piece 14 also comprises a first opening indicator 50 in the form of a circular arc extending substantially over an angular sector greater than 180 ° around the reference axis 200, preferably from a first lateral edge 46 of the hinge 36 to a second opposite lateral edge 48 of the hinge, without being connected thereto. The first opening indicator 50 is connected to the peripheral rim 42 of the peripheral wall 40 of the cap by breakable bridges 52, and is positioned axially between the peripheral rim 42 and the fixing ring 34. As illustrated in particular on the Figures 3 and 4 , a free space 54 is preserved in the axial direction between the ring 34 and the first opening indicator 50 in the closed position before first opening.

The two parts 12, 14 are assembled to form the closure device, by making the reference axes 100, 200 coincide in the position illustrated in FIGS. Figures 3 and 4 , then bringing the two parts 12, 14 closer to one another by axial translation. It should be noted that it is not necessary to provide an angular indexing of the parts around the axes of rotation 100, 200 because of the symmetry of revolution of the first part. The fixing ring 34, which is provided with a fastening relief 56 projecting radially outwardly, is elastically deformed when the fixing relief 22 passes through the groove 20, and then irreversibly engages in the fixing groove 20, the attachment reliefs 22 and 56 opposing the separation of the two parts. The first opening indicator 50 has a hooking relief 58 which, after elastic deformation at the passage of the hooks 30, snaps under the hooks 30 of the retaining tongues 24, as shown in FIGS. Figures 5 and 6 .

At the first opening of the cap 32, the first opening indicator 50 is retained by the hooks 30 of the tongues 24, and the bridges 52 are torn off, separating the first opening indicator 50 from the cap 32. The first opening indicator 50 then falls by gravity in the free space 54 and abuts against the ring 34. This position is maintained when the cap 32 is closed, as shown in FIGS. Figures 7 and 8 .

The fall of the first opening indicator 50 reveals a space 58 ( Figure 8 ) between the cap 32 and the first opening indicator 50, which space is perfectly visible from all angles and indicates to the consumer that the closure device 10 has been opened. Remarkably, this space runs all around the hood, from one side edge of the hinge to the other. Also remarkably, there is neither appearance nor disappearance of the first opening witness 50, but simply displacement of the latter. Even if it is not familiar with the closure device 10, the consumer noting the positioning of the first opening indicator 50 on the closed closure device can easily check whether or not there has been opening by shaking or inverting the container. and observing whether or not there is movement of the first-open witness, or listening to the sound of the first-opening indicator moving relative to the first coin.

Note also that since the first opening indicator 50 remains trapped by the tabs 24, the release into the environment of a plastic part that could be a source of pollution or a danger if swallowed by a child.

The open position illustrated on the figure 2 is preferably a stable position, and the hinge 36 is preferably a reactive hinge in the sense that, after breaking the bridges 52, the hinge 36 itself tends to drive the cap 32 to the open position. If necessary, the hinge is reactive only after exceeding an angular position of neutral position about the axis 300. One can then speak of bistable hinge, in the sense that according to the angular positioning of the cap 32 of a either side of the dead point, the hinge 36 recalls the cap 32 to the closed position or the open position.

A second embodiment of the invention will now be described in connection with the Figures 9 to 17 . This closure device is largely similar to that of Figures 1 to 8 and, to avoid repetition, reference is made to the foregoing description for the common points.

As illustrated in the figures, the first piece 12 of the closure device 10 according to the second embodiment has only a notch 26 extending over an angle of less than 180 °, and preferably about 60 to 120 ° , preferably diametrically opposite the hinge 36. On either side of this notch 26 is formed a groove 20 which runs in the peripheral direction from one edge of the notch 26 to the other, so on an angular sector of more than 180 °, complementary to that of the notch 26. The groove 20 is provided with a fixing relief 22, projecting radially inwards and towards a cylindrical wall 28 of the pourer 18.

The second piece 14 comprises a cap 32 whose peripheral wall 40 has a notch 41 to at least partially accommodate a first opening indicator 50 which is connected to the peripheral wall 40 by breakable bridges 52 located at this notch 41. L The fixing ring 34 of the second piece 14 has a segment 35 of reduced height at the level of the first-opening indicator 50, to leave between the first-opening indicator 50 and the fixing ring 34 a sufficient space 54 visible to the user. Notch 26. On either side of the segment 35, the fixing ring 34 has a greater height and is provided with a fixing relief 56 projecting radially outwards, which runs substantially to the edge. corresponding side 46, 48 of the hinge 36. The first opening indicator 50 has in the circumferential direction a length slightly greater than the notch 26 and has at its ends emitted two attachment reliefs 58, located in the extension of the fixing reliefs 56 of the fastening ring 34. The ends of the fastening groove 20 are thus arranged opposite the two hooking reliefs 58, and constitute two zones hooking for the first opening indicator 50. Outside these two attachment zones, the fixing groove 20 accommodates and retains the fixing ring 34.

At the assembly, the reference axes 100, 200 of the two parts 12, 14 are aligned and angularly positioned relative to one another, before bringing them together. The ring 34 snaps into the groove 20, and the attachment reliefs 58 snap into the attachment zones at both ends of the groove 20.

At the first opening, the first opening indicator 50 is blocked at the attachment zones, the bridges 52 are torn off and the cap 32 is opened while the first opening indicator 50 falls by gravity into the free space 54 in contact with the thinned segment 35 of the fixing ring 34, as illustrated in FIGS. figures 11 and 15 to 17 . This position is maintained during a subsequent closure of the cap 32, so as to inform the consumer of the opening of the container.

Of course, many variations are possible. To limit the bending deformation of the first opening indicator 50 when tearing off the bridges 52, it may be advantageous to position these only in the vicinity of the ends of the first opening indicator and the attachment reliefs 58.

The shape of the hinge 36 and that of the cap 32, which in the embodiments shown have been chosen to give good mechanical strength to the second part 14 and to minimize the consumption of material, may however vary according to particular aesthetic considerations. The pourer 18 may be of any type and is not necessarily centered on the reference axis 200 of the second part.

In a variant of the first embodiment, it can be provided that the annular attachment relief 22 provided on the first piece 12 for fixing the ring 34 is projecting radially outwardly from the cylindrical wall 28 of the pourer. Similarly, the hooks 30 can be placed on the cylindrical wall 28 of the pourer, and oriented radially outwardly. The retaining tabs 24 then only have a function of retaining the ring 34 and the first-opening indicator 50. This remark is similarly valid for the second embodiment.

Naturally, the invention, as defined by the claims, is applicable to capping devices having various external forms.

Claims (9)

1. A closure device (10) to be fastened to a container neck, with the closure device (10) comprising:

   - a first part (12) forming a base (16) for fixing to the container neck and having at least one fixing peripheral groove (20);

   - a second part (14) forming a cap (32), with a fixing ring (34) defining a reference geometrical axis (200), and a hinge (36) connecting the holding ring (34) to the cap (32) for guiding the cap (32) relative to the fixing ring (34) between a closed position and an open position, with the fixing ring (34) being snap-fitted into the fixing groove (20) of the first part;

   characterized in that the second part (14) further forms a first opening indicator (50) and a frangible connection (52) between the first opening indicator (50) and a peripheral rim (42) of the cap, with a free space (54) being preserved in the axial direction between the fixing ring (34) and the first opening indicator (50) in the closed position prior to the first opening, with the first opening indicator (50) being held by at least one latching area (30) of the first part so as to be separated from the cap (32) and fall into the gap (54) upon first opening.
2. A closure device according to the preceding claim, characterized in that the first part (12) comprises at least two areas (30) for latching the first opening indicator (50), and at least a visual control cut (26) separating the two latching areas (30) and making visible, in the closed position prior to the first opening, the first opening indicator (50) and the free space (56).
3. A closure device according to the preceding claim, characterized in that said latching areas (30) are more than two in number, preferably distributed over the entire periphery of the first part (12) and are separated two by two by cuts (26), at least one of which is a visual control cut making visible, in the closed position prior to the first opening, the first opening indicator (50) and the free space (56).
4. A closure device according to any one of the preceding claims, characterized in that the area(s) (30) for latching the first part cooperate (s) with the first opening indicator (50) so as to oppose the extraction of the first opening indicator (50) after the first opening.
5. A closure device according to any one of the preceding claims, characterized in that the first opening indicator (50) has the shape of an arc of circle about the reference axis (200).
6. A closure device according to the preceding claim, characterized in that the arc of circle runs over an angular sector greater than 45° about the reference axis, and preferably less than 180°, for example of the order of 60°, 90° or 120°.
7. A closure device according to the preceding claim, characterized in that the arc of circle runs over an angular sector greater than 180° about the reference axis, preferably from a first side edge (46) of the hinge up to a second opposite side edge (48) of the hinge.
8. A closure device according to any one of the preceding claims, characterized in that the hinge (36) comprises a strip of material connected through an upper end to a connecting area of the cap (32) and through a lower end to the fixing ring (34), and opposite side edges (46, 48) facing matching side rims of the cap (32).
9. A closure device according to the preceding claim, characterized in that, in the closed position, the hinge (36) does not protrude with respect to a peripheral wall of the cap.

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