Abstract:
The invention concerns a closure comprising a base portion and a cap forming portion including a top articulated to a ring through a hinge. The strap enables the cap forming portion to be moulded in closing position of the top, tamperproof means being provided between the ring and the top. When the cover is closed, the sensitive zones of the cap are either located in a sealed closed space, or capable of being in contact with a liquid (in solution or spray) and capable of being treated so as to eliminate said liquid, so as to sanitize the closure. Furthermore, the tamperproof means are deformed and ruptured when the top is first opened such that the resulting free ends are sufficiently spaced apart from each other, thus easily revealing to a user whether it has been tampered with.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS  
       [0001]     This application is a continuation of Application No. PCT/FR2003/002061, filed Jul. 2, 2003, which claims priority to French Application Nos. 02 08849 and 02 08850, both of which were filed Jul. 12, 2002. All of these applications are incorporated by reference herein. 
     
    
     BACKGROUND AND SUMMARY OF THE INVENTION  
       [0002]     The invention concerns a closure of the type comprising on the one hand a base part comprising a top opening and a bottom opening at its axial ends and intended to be mounted on the neck of a receptacle, and on the other hand a part forming a cap itself comprising an annular ring connected to the base part and a cover associated with the ring by a joining and hinging device, the cover being able to be moved, with respect to the ring, between an open position and a closed position.  
         [0003]     The invention concerns more specifically such closures in which the shape and geometry of the joining and hinging device are suitable for allowing moulding of the part forming a cap in the closed position of the cover. This is because, firstly, moulding in the closed position reduces the manufacturing costs of the closure: the mould used is of reduced dimensions, therefore less expensive; it is not necessary to provide an addition operation of closing the closing/opening part after the closure is removed from the mould in order to allow the storage and delivery thereof in the closed position, which avoids extending the cycle time and reducing the production rate. Moreover, moulding in the closed position makes it possible to fairly simply provide tamper-evident means between the ring and the cover by moulding these tamper-evident means in a single piece with the part forming a cap.  
         [0004]     However, closures of this known type poses a certain number of problems. First of all, the known closures do not meet the increasing demand for asepticisation of the closures, by immersion in a bath of asepticising liquid or by spraying such a liquid.  
         [0005]     This is illustrated by means of an example of a closure with a hinge of the prior art depicted in FIGS.  1  to  3 , in the closed position, respectively in a side view, seen in the direction of the arrow A, and seen in axial section. The closure  100  comprises on the one hand a base part  101 , intended to be mounted on the neck of a receptacle, and comprising a funnel  102  provided with a top opening. The closure  100  also comprises a closing/opening part  103  hinged on the base part  101  by a hinge  104 , and able to be moved between a closed position in which the closing/opening part  103  covers the funnel  102  and closes off the top opening thereof, and an open position, in which the top opening of the funnel  102  is left clear. The hinge  104  has the general shape of a butterfly, comprising a top edge  105  in the form of an arc of a circle connected to the closing/opening part  103 , a bottom edge  106  in the form of an arc of a circle connected to the base part  101 , and two lateral edges  107   a,    107   b.    
         [0006]     Asepticisation is carried by immersing the closure in a bath and/or by spraying an asepticising liquid, the closing/opening part being in the closed position. After this operation, it is necessary to rinse the closure in order to eliminate any trace of aseptic liquid. This operation is performed by spraying a rinsing liquid onto the closure. However, when the closing/opening part  103  is in the closed position, it exists a space e of very small dimensions between the hinge  104  and each of the two parts  101 ,  103  of the closure  100  (see  FIG. 1 ). Because of this, it is not possible to rinse the closure  100  suitably, traces of aseptic liquid being liable to remain in the said space e, which is desirable.  
         [0007]     In addition, the structure of this type of hinge—and in particular the small distance separating the top edge  105  from the bottom edge  106 , does not make it possible to produce closures which, when the closing/opening part  103  is in the closed position, provides an excellent seal between the base part  101  and the closing/opening part  103 . This is because, when the closing/opening part  103  is in the closed position, the bottom edge  108  of the closing/opening part  103  and the top edge  109  of the base part  101  are not perfectly contiguous, a clearance j existing between them (see FIGS.  1  to  3 ).  
         [0008]     As a result, when the closure  100  is immersed in a bath for the asepticisation operation, the aseptic liquid can infiltrate through the space e and through the clearance j to the area between the external face of the funnel  102  and the internal face of the closing/opening part  103 . However, this area cannot be suitably rinsed by spraying. This is all the more harmful since the consumer may drink the content of the receptacle provided with the closure directly through the funnel. Though this problem related to the asepticisation of closures has been illustrated with reference to a closure moulded in the open position, the same applies to the known closures moulded closed.  
         [0009]     Moreover, the known closures do not give entire satisfaction with regard to tamper-evidence. This is because, usually, these closures comprise simple breakable bridges, broken into two parts when the cover is first opened. However, when the cover is closed again, the user does not see clearly whether the bridges have been broken, because of the small dimensions of these and the small distance separating the tamper-evident strip from the cover. In addition, the two parts of the bridge are placed exactly facing one another again.  
         [0010]     Other tamper-evident means exist, but have other drawbacks. For example, when a completely detachable tamper-evident strip is provided, the user must take care of the removal of this tamper-evident strip. It is often thrown on the floor, but children may put it in their mouths; there is also a risk that the strip may be put back in the receptacle. The invention aims to mitigate these drawbacks.  
         [0011]     To this end, and according to a first aspect, the invention concerns a closure of the aforementioned type, provided with tamper-evident means between the ring and the cover, in which the joining and hinging device is in the form of at least one strap, a first end of which is connected to the ring and a second end of which is connected to the cover, the arrangement of the strap, the base part and the part forming a cap being such that, when the base part and the part forming a cap are connected to one another, the cover being in the closed position, at least the sensitive zones of the closure are either situated in a sealed closed space or liable to be in contact with a liquid when the closure is immersed in said liquid or when said liquid is sprayed on the closure, and able then to be treated in order to remove the said liquid, so as to allow the asepticisation of the closure.  
         [0012]     “Sensitive areas of the closure” means areas of the closure which are wanted to be free from contamination, in particular because a user is liable to place his mouth there, or because they may constitute a space for the proliferation of pathogenic germs which can be transferred to the content of the receptacle. The function of the particular structure of the closure according to the invention is thus to make the sensitive areas of the closure either enclosed in a impervious space or accessible to contact with an asepticising liquid, and to a rinsing liquid, for example sprayed. “Impervious” means impervious to liquids, when the closure is immersed in a liquid at a pressure less than 3 bar, or when a liquid is sprayed onto the closure. For example, the space between the external face of the cover and the opposite face of the strap is of sufficiently large size to be able to be treated in order to remove said liquid.  
         [0013]     In addition, when the base part comprises an annular wall from which there project, substantially perpendicularly and in opposite directions, firstly an external skirt provided with an internal thread intended to cooperate with a complementary external thread on a receptacle neck, and secondly a funnel intended to be covered by the cover, the closure can be such that, when the cover is in the closed position, the cover and the funnel cooperate sealingly so that, in particular, the space between the funnel and the cover is closed and impervious. The tamper-evident means of a closure provided with such a strap can comprise an element connected on the one hand to the ring and on the other hand to the cover, said element being arranged so as to be deformed and broken when the cover is first opened, the element then being separated into a first part having a first end attached to the ring and a free second end and a second part having a first end attached to the cover and a free second end, the function of the arrangement of said element and said plug being to move the two free ends away from one another so that, when the cover is once again in the closed position, it exists between said two free ends a sufficiently great distance to be easily detected by a user.  
         [0014]     The invention also concerns a closure comprising on the one hand a base part and on the other hand a part forming a cap itself comprising a ring and a cover associated by a joining and hinging device in which the tamper-evident means provided between the ring and the cover comprise at least one element connected on the one hand to the ring and on the other hand to the cover, said element being arranged so as to be deformed and broken when the cover is first opened, the element then being separated into a first part having a first end attached to the ring and a free second end and a second part having a first end attached to the cover and a free second end, the function of the arrangement of the said element and said plug being to move the two free ends away from one another so that, when the cover is once again in the closed position, it exists between said two free ends a sufficiently great distance to be easily detected by a user. For example the ring has, at a distance from the joining and hinging device, at least one recess formed from the top-edge of the ring situated opposite the cover over a height less than the height of said ring, said recess having a width less than one third of the length of the circumference of the ring, the tamper-evident element being intended to be housed in said recess whilst being connected on the one hand at its bottom part to the bottom of the recess and on the other hand at its top part to the cover. Complementary mechanical means can be provided for forcing the deformation of the tamper-evident element when the cover is first opened or when the cover is closed following on from the first opening, so as to move away the free ends of the two parts of the broken tamper-evident element. The joining and hinging device of a closure provided with such tamper-evident means can be in the form of at least one strap, a first end of which is connected to the ring and a second end of which is connected to the cover, the arrangement of the strap, the base part and the part forming a cap being such that, when the base part and the part forming a cap are connected to one another, the cover being in the closed position, at least the sensitive zones of the closure are either situated in a sealed closed space or liable to be in contact with a liquid when the closure is immersed in said liquid or when the said liquid is sprayed on the closure, and able then to be treated in order to remove said liquid, so as to allow the asepticisation of the closure.  
         [0015]     According to the second aspect, the invention concerns an assembly comprising a closure as previously described and a receptacle neck or a receptacle having a neck, said receptacle being empty or at least partially filled with a certain content. Finally, according to a third aspect, the invention relates to a method of producing such a closure which the annular ring, the cover, the strap and the tamper-evident means are moulded in a single piece and in the closed position. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0016]     The other characteristics of the invention result from the following description of embodiments, a description given with reference to the accompanying figures, in which:  
         [0017]      FIG. 4  is a view in axial section of a closure according to the invention, in the closed position;  
         [0018]      FIG. 5  is a side view of the closure, before the cover is first opened;  
         [0019]      FIG. 6  is a side view of the closure, the cover being in the open position;  
         [0020]     FIGS.  7  to  10  are views in rear perspective of closures according to the invention, provided with a joining and hinging element according to respectively first, second, third and fourth embodiments;  
         [0021]      FIG. 11  is a partial view of a closure provided with a joining and hinging element according a fifth embodiment;  
         [0022]      FIG. 12  is a schematic view of the internal face of the joining and hinging element in  FIG. 10  disposed flat;  
         [0023]      FIG. 13  is a perspective view of a closure according to the invention screwed onto a receptacle neck, before the cover is first opened, the closure comprising a tamper-evident element according a first embodiment;  
         [0024]      FIG. 14  is a perspective view of a closure according to the invention, the closure comprising a tamper-evident element according to a second embodiment, before the cover is first opened;  
         [0025]      FIG. 15  is a partial view in axial section of the closure of  FIG. 13 , in the vicinity of the tamper-evident element, before the cover is first opened;  
         [0026]      FIG. 16  is a partial perspective view of the closure of  FIG. 13 , in the vicinity of the tamper-evident element, after the cover is first opened, the cover being in the closed position and the tamper-evident element released;  
         [0027]      FIG. 17  is a partial view in axial section of the closure of  FIG. 13 , in the vicinity of a tamper-evident element after the cover is first opened, the cover being in the closed position;  
         [0028]      FIG. 18  is a perspective front view of part of a closure according to the invention, after the cover is first opened, the closure a comprising a plurality of tamper-evident elements according to a second embodiment;  
         [0029]      FIG. 19  is an enlarged view of detail A in  FIG. 18 ;  
         [0030]      FIG. 20  is an enlarged view of detail A in  FIG. 18 , after the cover is first opened, the cover being in the closed position;  
         [0031]      FIG. 21  is a side view of part of a closure, before the cover is first opened, the closure comprising a tamper-evident element according to a third embodiment;  
         [0032]      FIG. 22  is an enlarged view of detail B in  FIG. 21 ;  
         [0033]      FIG. 23  is an enlarged view of detail B in  FIG. 21 , after the cover is first opened, the cover being in the closed position.  
     
    
     DETAILED DESCRIPTION  
       [0034]     Reference is made first of all to FIGS.  4  to  6 , which depict a closure  1  of axis  2 , provided with a joining and hinging element  3 . The closure  1  is for example produced from plastics material. The closure  1  comprises on the one hand a base part  4 , intended to be mounted on a receptacle neck, and on the other hand a part forming a cap  5  intended to be associated with the base part  4 . The closure  1  is described in a position where the axis  2  is vertical, the part forming a cap  5  being situated above the raised part  4 . The axis  2  defines an elevation direction with respect to which the terms “height”, “top”, “bottom” are defined. A location close to the axis  2  is said to be “internal”, in contradistinction to a location at a distance from the axis  2 , said to be “external”. Naturally, the closure  1  can take other positions in space, in particular when it is used by a consumer.  
         [0035]     The neck with which the closure  1  is intended to be associated has an opening through which the content of the receptacle can pass. The neck comprises on its external face a thread, projections forming attachments means, situated under the thread, and a collar forming a support surface, situated under the projections. The receptacle can be flexible, so that a user, can, by pressing on the said receptacle, assist the discharge of the content. The receptacle can also be rigid.  
         [0036]     The base part  4  of the closure  1  is described first of all. The base part  4 , moulded in a single piece, is produced from a relatively rigid plastics material. The base part  4  comprises first of all an annular wall  10 , of axis  2 , having at its centre a pouring orifice  11  with a relatively large diameter, for example around three quarters of the outside diameter of the annular part  10 .  
         [0037]     The base part  4  also comprises a cylindrical external skirt  12 , projecting substantially perpendicular to the annular wall  10  from the external edge thereof. The external skirt  12  is provided with an internal thread  13  able to cooperate with the external thread on the neck.  
         [0038]     In addition, an annular tamper-evident strip  14  produced in a single piece with the base part  4 , is connected to the free end  15  of the external skirt  12  by breakable bridges  16  or by a line of lesser strength. The tamper-evident strip  14  comprises attachment projections  17 , directed towards the axis  2  of the closure  1 , and intended to cooperate with the projections on the neck of the receptacle to enable the tamper-evident strip  14  to be held on the said neck.  
         [0039]     The base part  4  also comprises a funnel  18 , projecting substantially perpendicularly from the annular wall  10  from the internal edge thereof, around the pouring orifice  11 , in the opposite direction to the external skirt  12 . The funnel  18  comprises first of all a substantially cylindrical bottom portion  19 , connected to the annular wall  10 , and extending over approximately one third of the total height of the funnel  18 . Approximately halfway up the bottom portion  19 , the external face of the funnel  18  comprises a projection  20  the function of which will be described later.  
         [0040]     The funnel  18  also comprises an intermediate portion  21  extending from the top edge of the bottom portion  19  towards to the top of the closure  1  and towards the axis  2 . The intermediate portion  21  has substantially the form of a truncated cone the angle of which at the vertex is less than 90°, for example around 70°. Finally, the funnel  18  comprises a substantially cylindrical top portion  22 , connected to the top edge of the second intermediate portion  22 , extending over approximately one third of the total height of the funnel  18 . The diameter of the top portion  22 , which defines the top opening of the base part  4 , is for example around one half the diameter of the bottom portion  19 .  
         [0041]     In the junction area between the top portion  22  and the intermediate portion  21 , the funnel  18  can comprise an internal element  6  intended to regulate the discharge flow of the content of the receptacle. The element  6  comprises first of all a discoidal part  7  placed substantially perpendicular to the axes  2 , held inside the funnel  18  by friction against the internal wall of the said funnel  18  and by contact with an internal rim  23  on the funnel  18 . The discoidal part  7  is for example produced from polypropylene or high-density polyethylene. The discoidal part  7  has a central stud  8  directed towards the top portion  22  of the funnel  18 , and at least one orifice  9 , situated at a distance from the stud  8 , and passing through said discoidal part  7  so as to make the inside of the receptacle provided with the closure  1  communicate with the top opening of the base part  4  of the closure  1 .  
         [0042]     The element  6  also comprises a flexible membrane  24 , for example made from elastomer, situated in the immediate vicinity of the discoidal part  7 , on the same side as the top portion  22  of the funnel  18 . The flexible membrane  24  has a central opening able to cooperate with the stud  8  and also bears against the internal face of top portion  22  of the funnel  18 .  
         [0043]     This closure  1  is intended to be associated with a flexible receptacle. Under the effect of the pressure exerted by a user on the receptacle, the closure  1  being turned over so that the top opening of the base part  4  of the closure  1  is directed downwards, the flexible membrane  24  is deformed and its central opening is released from the stud  8 . Thus the content of the receptacle can pass through the orifices  9  in the discoidal part  7  and the central opening in the flexible membrane  24 . When no pressure is exerted on the receptacle, the membrane  24  is in the position depicted in  FIG. 8 , and the content of the receptacle cannot emerge towards the top opening of the base part  4  of the closure  1 .  
         [0044]     In addition, the funnel  18  comprises an external rim  27  towards to the top part of the top portion  22 . The function of the external rim  27  is described later. Finally, the funnel  18  has, at its top end part, a fold  25 . In addition, the base part  4  comprises an internal skirt  28  projecting substantially perpendicular from the annular wall  10  in the same direction as the external skirt  12 . The internal skirt  28  is intended to cooperate with the internal face of the receptacle neck, for the purpose of impermeability.  
         [0045]     The part forming the cap  5  of the closure  1  is now described. The part forming the cap  5  is moulded in a single piece and produced from a relatively rigid plastics material. The part forming a cap  5  comprises an annular ring  29  comprising at least one projection  30  on its internal face, said projection  30  being intended to cooperate with the projection  20  on the funnel  18 . The ring  29  can have a continuous projection  30  or several projections  30  regularly spaced apart on its internal face. Thus the ring  29  is kept attached to the base part  4 . In addition the bottom edge of the ring  29  is situated in the immediate vicinity of the annular wall  10  of the base part  4  of the closure  1 .  
         [0046]     The part forming a cap  5  also comprises a cover  31  connected to the ring  29  by a joining and hinging element in the form of a strap  3 . The cover  31  is able to be moved between a closed position, in which the cover  31  covers the funnel  18 , thus closing off the top opening of the base part  4  ( FIGS. 4 and 5 ), and an open position, in which the funnel  18  is left clear, the said top opening not being closed off ( FIG. 6 ).  
         [0047]     The cover  31  comprises a top wall  33 —able to cover the top opening of the base part  4 —from which there project, substantially perpendicular and in the same direction: 
        an external lateral wall  34  able to surround the funnel  18  when the cover  31  is in the closed position, and comprising a front area  34   a,  substantially opposite to the hinge, surmounted by a rim  34   b,  arranged to allow easy opening of the cover  31  by simple action of the thumb;     an external skirt  35 , situated inside the cover  31 , provided with an internal rim  36  able to cooperate with the external rim  27  on the top portion  22  of the funnel  18 , thus allowing closure by snapping the cover  31  onto the base part  4 ;     an internal skirt  37 , with a smaller diameter than that of the external skirt  35 , the said internal skirt  37  being able to cooperate with the fold  25 , for the purpose of sealing.        
 
         [0051]     The various sealing means provided on the one hand between the base part  4  and the neck (internal skirt  28  on the base part  4 ), and on the other between the base part  4  and the part forming a cap  5  (internal skirt  37 ), provide a perfect seal on the receptacle-closure  1  assembly with respect to the liquid contained in the receptacle, even if a user turns the receptacle over when the cover  31  is in the closed position. In addition, the lateral wall  34  has a height such that, when the cover  31  is the in the closed position, the free edge  38  of said lateral wall  34  is situated opposite the bottom portion  19  of the funnel  18 , for example substantially halfway up said bottom portion  19 . Thus the cover  31  and the funnel  18  cooperate sealingly on the one hand close to the free edge  38  of the lateral wall  34  of the cover  31 , and on the other hand in the vicinity of the fold  25  of the funnel  18 , via the internal skirt  37 , so that the space between the external face of funnel  18  and the internal face of the cover  31  is closed and sealed, therefore not being able to be attacked by an asepticising liquid, neither from the inside nor from the outside of the closure.  
         [0052]     Moreover, the height of the ring  29  is such that, when the cover  31  is in the closed position, the top edge  39  of said ring  29  is situated in the immediate vicinity of the free edge  38  of the cover  31 , a very small and relatively invisible space existing between them. Before the cover  31  is first opened, the free edge  38  of the lateral wall  34  of the cover  31  can be connected to the top edge  39  of the ring  29 , in particular by breaking bridges  40 .  
         [0053]     The strap  3  is now described. The strap  3  has a first end  43  connected to the ring  29  and a second end  42  connected to the cover  31 . The strap  3  is for example connected to the ring  29  close to the top edge  39  of said ring  29 , the second end  42  of the strap  3  being connected to the cover  31  at a significant distance from the ring  29 , for example close to halfway up the height of the funnel  18 . In addition, the distance between the external face of the cover  31  and the internal face of the strap  3 —opposite the cover  31 —is relatively great. Thus the space provided between the strap  3  and the cover  31  is relatively great, unlike the prior art, which helps to allow effective rinsing of the closure  1 .  
         [0054]     In the embodiments depicted, the strap  3  is substantially rectangular in shape and is vertically broad. The height of the strap  3  is for example between half and twice its length. The width of the strap  3  can be close to the diameter of the top portion  25  of the funnel  18 .  
         [0055]     The strap  3  is designed to allow moulding in the closed position of the part forming a cap  5  as well as excellent asepticisation of the closure  1 . This is because the strap  3  is “external” to the closure  1  in that it does not require any particular arrangement of the closure  1  (strip  29  and cover  31 ) at the ends  42 ,  43  of the strap  3 . In particular, no aperture is necessary on the ring or cover, and the strap  3  is not “integrated” in the ring or cover, but simply connected to these.  
         [0056]     In addition, the material making up the strap  3  is sufficiently flexible to allow deformation of the said strap  3  in particular close to its ends  42 ,  43  (the strap  3  remaining however sufficiently strong). Thus, as illustrated in  FIG. 6 , the strap  3  enables the cover  31  to be opened between around 130° at a minimum and around 210° at a maximum, and enables the cover  31  to be held in the open position, without it being necessary to have recourse to a standard, more expensive, hinge, for example of the butterfly type. The hinge being produced by single element (the strap  3 ), the use of such a hinge is also simple and inexpensive.  
         [0057]     The strap  3  comprises two transverse hinge areas  47 ,  48  each situated towards one end  42 ,  43  of the strap  3 . Thus the strap  3  has, for example, when the cover  31  is in the closed position: 
        a first substantially horizontal part, connected to the external lateral wall  34  of the cover  31 ;     a second substantially vertical part;     a third substantially horizontal part, connected to the ring  29 .        
 
         [0061]     A hinge area  47 ,  48  may be a weakening line situated at a distance from the corresponding end  42 ,  43  of the strap  3  ( FIG. 9  for example) or situated in the immediate vicinity of this end  42 ,  43  ( FIG. 8  for example). This hinge area  47 ,  48  can be in the form of a localised thinning produced from the internal face of the strap  3 . The hinge areas  47 ,  48  can also be obtained simply by the use of a relatively flexible material for producing the strap  3 , to allow deformation of said strap in particular close to its ends.  
         [0062]     According to one possible embodiment, the strap  3  also comprises at least one—and for example a single—transverse weakening area  44  situated between the two hinge areas  47 ,  48 , for example substantially halfway up the strap  3 . This transverse weakening area  44  can be in the form of a localised thinning. It is intended to assist the movement of the strap  3  towards the open position of the cover  31  and holding it in this position. According to other embodiments, the strap  3  has no such transverse weakening area  44 .  
         [0063]     Various embodiments of straps  3  are shown in FIGS.  7  to  12 . According a first embodiment ( FIG. 7 , the base part  4  not being shown), the strap  3  has, in longitudinal section, the shape of a U the bottom of which is curved towards the outside of the closure  1 , when the cover  31  is in the closed position. The weakening area  44  is delimited by two arcs of a circle  45 ,  46  the concavities of which are directed in opposite directions to one another, said weakening area  44  thus having substantially the shape of a butterfly, with a reduced thickness with respect to the rest of the strap  3 . This thinning is here produced both from the internal and from the external face of the strap  3 .  
         [0064]     According to a second embodiment ( FIG. 8 ), the strap  3  has, in longitudinal section, the shape of a U the bottom of which is directed aslant with respect to its arms, when the cover  31  is in the closed position. The weakening area  44  is here also delimited by two arcs of a circle  45 ,  46  forming a butterfly. According to a third embodiment ( FIG. 9 ), the strap  3  has, in longitudinal section, the shape of a U the bottom of which is curved towards the closure  1 , when the cover  31  is in the closed position. The weakening area  44  is substantially rectilinear. Finally, according to a fourth embodiment ( FIG. 10 ), the strap  3  has a longitudinal section in the shape of an arc of circle when the cover  31  is in the closed position.  
         [0065]     According to a fifth embodiment, the strap  3  is reinforced by the addition of two lateral walls  49   a,    49   b.  The strap  3  thus has a central longitudinal part  50  of thickness e 1 , comprising two transverse thinning areas  47 ,  48  each hinged towards one of the ends  42 ,  43  of the strap  3 , and two lateral longitudinal parts  49   a,    49   b,  situated on each side of the central longitudinal part  50 . These lateral longitudinal parts  49   a,    49   b  have a thickness e 2  less that the thickness e 1  of the central longitudinal part and have no transverse thinning area. The width of each of the lateral longitudinal parts  49   a,    49   b  can be between 5% and 15% of the total width of the strap  3 . By way of example, the thickness e 1  is around 0.7 mm, the thickness of the transverse thinning areas  47 ,  48  around 0.2 mm and the thickness e 2  greater than 0.2 mm. The width of each of the lateral longitudinal part  49   a,    49   b  can be around 1 mm.  
         [0066]     The existence of the lateral longitudinal part  49   a,    49   b  with no transverse thinning areas makes it possible to avoid the creation of a rupture initiation liable to weaken the strap  3 . Thus the minimum tensile strength of the strap  3  is 9 daN (as opposed to approximately 50 N for the straps in FIGS.  7  to  10 ), the rotational strength also being improved, since the strap  3  can be turned about its axis by 180° at a minimum without breaking. However, this structure makes it possible to keep an opening in the cover  31  between 130° and 180°, since the thinning areas  47 ,  48  are maintained.  
         [0067]     The tamper-evident means according to the invention are described with reference to FIGS.  13  to  23 . The ring  29  has, at a distance from the joining and hinging device  3 , at least one recess  51 , formed from the top edge  39  of the ring  29 , over a height less than the height of said ring  29 . The width of the recess  51  is less than one third of the length of the circumference of the ring  29 . A tamper-evident element is intended to be housed in the recess  51  whilst being connected on the one hand at its bottom part to the bottom of the recess  51  and on the other hand at its top part to the cover  31 .  
         [0068]     The presence of this localised recess, at a distance from the strap  3 , affords much better visibility of the tamper-evident element than in the closures of the prior art. The height of the ring  29  is such that, when the cover  31  is in the closed position, the top edge  39  of the said ring  29  is situated in the immediate vicinity of the free edge  38  of the cover  31 , the height of the tamper-evident element being substantially equal to the height of the recess  51 . In addition, the particular deformation of the various tamper-evident elements according to the invention enables a user to see easily, or even immediately, whether the closure has already been opened.  
         [0069]     Reference is made first of all to FIGS.  13  to  17 , which show a first embodiment of the tamper-evident element. The recess  51  is substantially rectangular, with a height for example close to the three quarters of the height of the ring  29 , and comprises a bottom  52  substantially parallel to the top edge  39  of the ring  29 . The recess  51  is preferably diametrically opposed to the strap  3 , for better visibility of the tamper-evident means. The element forming a tamper-evident tell-tale  53  is housed in the scollop  51 . The tamper-evident element  53  has the general shape of a substantially flat half disc delimited by a rectilinear top edge  54  and by a bottom edge  55  in the form of a semicircle, and having an internal face  56  and an external face  57 . Naturally the closure  1  according to the invention can comprise several recesses  51  each associated with a tamper-evident element  53 .  
         [0070]     The bottom edge  55  of the tamper-evident element  53  is connected to the bottom  52  of the recess  51  by a sufficiently flexible connection to allow the pivoting of said tamper-evident element  53  about the bottom  52  of the recess  51 . To this end, the external face  57  of tamper-evident element  53  has, towards the bottom edge  55 , a thinning  58 , for example produced from the external face of the tamper-evident element  53 , the connecting area between the tamper-evident element  53  and the ring  29  being thereby reduced compared with the total thickness of the ring  29 . The height of the tamper-evident element  53  is substantially equal to the height of the recess  51 , so that, before the cover  31  is first opened, the top edge  54  of the tamper-evident element  53  is situated so as to be continuous with the top edge  39  of the ring  29 . Before the cover  31  is first opened, the top edge  54  of the tamper-evident element  53  is connected to the free edge  38  of the lateral wall  34  of the cover  31  by a breakable bridge  59 .  
         [0071]     In addition, the tamper-evident element  53  comprises a protrusion  60  on its internal face  56 , said protrusion  60  being compact with the external face of the bottom portion  19  of funnel  18  before the cover  31  is first opened. The dimensions of the protrusion  60  and the relative positioning of the funnel  18  and tamper-evident element  53  are chosen so that, before the cover  31  is first opened, the tamper-evident element  53  is forced towards the outside of the closure  1 , by pressure of the protrusion  60  against the funnel  18 . For this purpose, firstly, the breakable bridge  59  and the connection between the tamper-evident element  53  and the bottom  52  of the recess  51  are sufficiently strong to enable the tamper-evident element  53  to be held in this position, although the tamper-evident element  53  is subjected on the part of the funnel  18  to a force directed towards the outside. Secondly, the material making up the base part  4  of the closure  1  and the material making up the part forming a cap  5  must be sufficiently rigid for neither the protrusion  60  nor the area of the funnel  18  situated opposite the protrusion  60  to be deformed significantly, and for the contact between the protrusion  60  and the funnel  18  to generate a thrust force towards the outside of the closure  1 .  
         [0072]     The way in which the tamper-evident element  53  enables a consumer to check visibly and unambiguously that the cover  31  has not been opened is now described. Before the cover  31  is first opened ( FIGS. 5, 13  and  15 ), the tamper-evident element  53  is connected to the free edge  38  of the side wall  34  of the cover  31  by the intact breakable bridge  59 . In addition, the protrusion  60  is in contact with the funnel  18 , the tamper-evident element  53  being forced towards the outside of the closure  1 .  
         [0073]     When the cover  31  is first opened, the user acts on the cover  31 , pulling it and moving it, via the strap  3 , to the open position. The breakable bridges  40  connecting the free edge  38  of the lateral wall  34  of the cover  31  to the top edge  39  of the ring  29 , on one hand, and the breakable bridge  59  connecting the tamper-evident element  53  to the free edge  38  of the lateral wall  34  of the cover  31 , on the other hand, are broken.  
         [0074]     The tamper-evident element  53  is then no longer connected to the cover  31 . Because of the forcing of the tamper-evident element  53  towards the outside, via the protrusion  60  cooperating with the funnel  18 , and the flexible connection between the bottom edge  55  of the tamper-evident element  53  and the bottom  52  of the recess  51 , the tamper-evident element  53  is pushed towards the outside of the closure  1  and pivots about said flexible connection. When the cover  31  is once again in the closed position, the tamper-evident element  53  keeps this position ( FIGS. 16 and 17 ).  
         [0075]     The tamper-evident element  53  is then situated in a position such that the thinning  58  is substantially in contact with the bottom  52  of the recess  51 , of the protrusion  60  no longer being in contact with the funnel  18 . Thus the fact that the cover  31  has already been opened is perfectly visible, since the free ends  67 ,  68  of the two parts of the tamper-evident element  53  formed by the breaking of the bridge  59  are distant from one another significantly, following on from the pivoting of said tamper-evident element  53 .  
         [0076]     When the closure  1  is looked at sideways ( FIGS. 6 and 17 ), it can be seen clearly that the tamper-evident element  53  is projecting towards the outside of the closure, rather than housed in the recess  51 , in contact with the funnel  18 . In addition, when the closure  1  is looked at “front on”, that is to say in the direction of the tamper-evident element  53 , a space  61  appears between the free edge  38  of the lateral wall  34  of the cover  31  and the top edge  54  of the tamper-evident element  53  ( FIG. 16 ). Because of the pivoting of the tamper-evident element  53  about the bottom  52  of the recess  51 , this space  61  is relatively large, and in any event with dimensions greater than the space generally existing between a tamper-evident strip and a cover. By way of comparison, the breakage of the bridges  40  between the ring  29  and the cover  31  is not as clearly visible.  
         [0077]     In the variant illustrated in  FIG. 14 , the recess  51  is also substantially rectangular and comprises a bottom  52 , as well as two lateral walls  62 . The lateral walls  62  of the recess  51  extend aslant from the external face of the ring  29  towards the internal face of said ring  29  and towards the tamper-evident element  53 . The structure on the one hand leaves clear the recess  51  for better visibility of the tamper-evident element  53 , and on the other hand facilitates the removal of the part forming a cap  5  from the mould, not creating any undercuts.  
         [0078]     Reference is now made to FIGS.  18  to  20 , which depict a second embodiment of the tamper-evident element. The tamper-evident element  53  is in the form of a rod whose end  63  fixed to the ring  29  and end  64  fixed to the cover  31  are offset with respect to one another along the circumference of the closure  1 . Thus the overall axis  65  of the rod is inclined with respect to the axis  2  of the closure  1 . The axis  65  of the rod is for example inclined by an angle of between 30° and 60° with respect to the axis  2  of the closure  1 .  
         [0079]     The rod is housed in a recess  51 , the end  63  of said rod being connected to the bottom  52  of the recess  51 . The distance between the ends  63 ,  64  of the rod is less than the width of the recess  51 . The rod has a substantially polygonal cross section but could also have a circular cross section. The cross section of the rod is smaller at its substantially middle part  66  than at its ends  63 ,  64 .  
         [0080]     When a user opens the cover  31 , thereby moving away the two ends  63 ,  64  of the rod, the rod extends and its axis  65  tends to be oriented parallel to the axis  2  of the closure  1 . Locally, at the ends  63 ,  64 , the rod pivots. At a certain angle of opening of the cover  31 , the strength limit of the rod is reached. The rod is then broken, at its smallest cross section, that is to say substantially at its middle.  
         [0081]     However, the rod keeps the deformation resulting from the opening movement of the cover  31 , particularly at its ends  63 ,  64 , where the two parts resulting from the breakage of the rod are locally substantially parallel to the axis  2  of the closure  1 . As a result the two free ends  67 ,  68  of the two parts of the rod are separated from one another. Such would not have been the case with a conventional bridge, oriented parallel to the axis  2  of the closure  1 : such a bridge would have been deformed parallel to the axis  2 , and the two free ends resulting from the breakage of this bridge would thereby have been situated opposite one another, substantially in contact, after the closure of the cover  31 . Here, on the other hand, the pivoting of the rod at its ends  63 ,  64  has caused the non-alignment of the two parts of the rod and the moving away of the two free ends  67 ,  68 . This embodiment also has the following advantages: removal from the mould by slides in the mould, not requiring any external reworking; flexibility of the rods when the part forming a cap  5  is assembled on the base part  4 , thereby preventing the deformation or any breakage of the rods.  
         [0082]     The closure  1  can comprise several recesses  51  each provided with a tamper-evident element  53  in the form of a rod. For example, unlike the strap  3 , two rods are provided. These rods are situated at a distance from one another and inclined symmetrically ( FIG. 18 ). The closure  1  can also comprise four recesses  51  regularly distributed at the periphery.  
         [0083]     Finally, reference is made to FIGS.  21  to  23 , which depict a third embodiment of the tamper-evident element. The closure  1  comprises here two recesses  51  the bottom  52  of which has a rounded shape, each recess  51  being provided with a tamper-evident element  53 . The recesses  51  are each situated at 90° from the strap  3 . The tamper-evident element  53  is in the form of a rod the end  69  of which is fixed to the ring  29 , at the bottom  52  of the recess  51 , and the end  70  of which is fixed to the cover  31 , are offset with respect to one another along the circumference of the closure  1 . Thus the overall axis of the rod is inclined with respect of the axis  2  of the closure  1 .  
         [0084]     For example, the rod has a first substantially linear area, extending from its end  69 , fixed to the ring  29  over at least two thirds of the height of the recess  51 . This first area is inclined with respect to the axis  2  of the closure  1  by an angle of between 20° and 50°. The first area is extended by a second slightly curved area, and inclined overall by angle of between 50° and 70°, extending towards and as far as the end  70  of the rod fixed to the cover  31 .  
         [0085]     The rod has for example a circular cross section, and this cross section is smaller in the vicinity of its end  70  connected to the cover  31 . In addition, the cover  31  has an appendage  71  extending towards the ring  29 . The appendage  71  is directed aslant, substantially parallel to the overall axis of the rod. The appendage  71  has for example the shape of a triangle whose base is substantially merged with the free edge  38  of the lateral wall  34  of the cover  31 , the side  72  of which facing the rod is substantially parallel to the rod, and the side  73  of which opposite to the side  72  has a curved shape complementary to the shape of the bottom  52  of the recess  51 . The tip  74  of the appendage  71  is situated in the vicinity of but at a distance from the end  69  of the rod fixed to the ring  29 .  
         [0086]     The first opening of the cover  31  results in the rupture of the rod, at its end  70  connected to the cover (the area with the smallest cross section). When the cover  31  is closed again, the appendage  71  comes into contact with the broken rod, and moves it in order to bend it towards the ring  29 . When the cover  31  is in the closed position, the rod is retained between the bottom  52  of the recess  51  and the side  73  of the facing triangle. Because of this, the free ends  67 ,  68  of the two parts of the rod are formed following the rupture of the rod are distant from each other, the space between them being sufficiently great to be able to be easily detected by a user.  
         [0087]     According to one possible embodiment, the closure  1  comprises two rods the ends  70  of which close to the smallest cross section of the rod are situated at a distance from one another and the other ends  69  of which are substantially adjacent. These rods are inclined substantially symmetrically, so as to form a V, as depicted in  FIG. 22 . The closure  1  comprises two appendages  71  situated outside the V.  
         [0088]     In addition, a projecting area of material  75  is provided on the free edge  38  of the cover  31  in order to extend, between the two rods, towards the ring  29 . This area  25  serves in particular as a means of reinforcing the closure  1 . Naturally, the tamper-evident element  53  can be reversed, the smallest cross section of the rod being able to be close to its end connected to the ring, and the appendage extending from the ring towards the cover. After the first opening of the cover, the rod is bent towards said cover.  
         [0089]     In addition, the very great visibility of the loss of tamper-proofness conferred by the invention can be greatly increased if the base part  4  and part forming a cap  5  of the closure  1  are produced in different colours. This can achieved very simply since the two parts of the closure  1  are moulded separately. Thus the space  61  is the same colour as the base part  4  and stands out clearly from the cover  31  and the ring  29 , both in the same colour different from the colour of the base part  4 . In addition to the many aesthetic possibilities, the production of a closure  1  in two colours affords better visibility of the tamper-evident means, and this in an immediate way.  
         [0090]     The invention has other advantages. In particular, the cover  31  is captive, since it is associated with the base part  4  of the closure  1  via the strap  3  and the ring  29 . The tamper-evident element  53  is also captive, since it remains connected to the ring  29 . This presents in particular additional safety vis-a-vis children, who cannot raise said tamper-evident element  53  to their mouths. Naturally, the various embodiment described can be combined with each other, the invention not being limited to the particular configurations depicted in the drawings.