Abstract:
A closure system for a baby bottle including a lower closure ring screwed onto an external thread of a bottle, an upper closure ring for connecting to a screw ring for fastening a drinking teat, locking elements which rotatably and releasably lock together the lower closure ring and the upper closure ring, a circular lip seal made of a soft elastic material concentric to a lower peripheral part being arranged on the first upper face, with at least one axially oriented sealing lip and at least one circular seal geometry engaging with the lip seal and concentric to an upper peripheral part being arranged on a second lower face or vice versa and by rotating the upper closure ring relative to the lower closure ring the upper throughflow hole may optionally be brought into overlapping and non-overlapping positions relative to a lower throughflow hole.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    Not applicable. 
       STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH 
       [0002]    Not applicable. 
       BACKGROUND OF THE INVENTION 
       [0003]    The invention relates to a closure system for a leakproof baby feeding bottle. 
         [0004]    In known baby feeding bottles, the teat at the lower edge has a peripheral teat flange which is secured sealingly to the edge of a bottle opening by means of a screw ring screwed onto an external thread of the bottle. In order to prevent leakage of liquid during breaks from drinking, a lid is placed between the teat flange and the flange edge and secured by means of the screw ring. 
         [0005]    A more user-friendly leakproof baby feeding bottle is disclosed in DE 101 57 071 C1. Said bottle has a lower closure ring which is screwed onto the external thread of the bottle and which has a first seat surface with at least one first throughflow hole. 
         [0006]    An upper closure ring has a second seat surface with at least one second throughflow hole. The two closure rings are able to be rotated relative to one another and releasably locked together via locking elements. By rotating the upper closure ring, the first and second throughflow holes are able to be brought into overlapping and non-overlapping positions. A drinking teat is screwed by means of a screw ring to an external thread of the upper closure ring. If the throughflow holes overlap one another, baby food is able to be taken through the drinking teat. If the throughflow holes do not overlap one another, the removal of baby food through the drinking teat is blocked. 
         [0007]    In the exemplary embodiment, the closure rings comprise conical seat surfaces. Moreover, sealing rings are present on the lower face of the lower closure ring and on the upper face of the first seat surface. The lower closure ring comprises a locking projection protruding inwardly from the lower conical seat surface and the upper closure ring has snap tongues protruding from the lower second conical seat surface and which engage behind the locking projection. 
         [0008]    The manufacture and usage of the leakproof bottle is, to a certain extent, still complicated. Due to the complex spatial shape, dirt is able to collect on the closure rings. The snap tongues come into contact with the baby food and have to be handled for dismantling. The cleaning of the closure rings is complicated. 
         [0009]    WO 2007/042117 A1 discloses a leakproof baby feeding bottle which simplifies the manufacture and usage. One variant comprises a closure system with a lower closure ring, which has a substantially cylindrical first peripheral part with a first internal thread which is screwed onto an external thread of a bottle, and which comprises a first central part connected to the upper edge of the first peripheral part, with a first seat surface rotationally symmetrical about a longitudinal axis and facing away from the bottle interior, at least one first throughflow hole which opens, on the one hand, in the first seat surface and, on the other hand, in one side of the first central part facing the bottle interior and a soft elastic sealing material made of plastics material, injection-moulded onto the first seat surface at least around the edge of the throughflow hole and onto a sealing surface of the first central part sealingly positioned on the upper bottle edge and which extends from the first seat surface through the first throughflow hole along the side facing the bottle interior as far as the sealing surface of the first central part. Moreover, the closure system comprises an upper closure ring which has a substantially cylindrical second peripheral part with a second external thread, on which a drinking teat of a screw ring with an internal thread is fixed and which comprises a second central part connected to the second peripheral part, with a second seat surface rotationally symmetrical about the longitudinal axis and sealingly located on the first seat surface, and at least one second throughflow hole which opens, on the one hand, in the second seat surface and, on the other hand, in one side of the second central part remote therefrom, and which by rotating the upper closure ring relative to the lower closure ring may be brought into overlapping and non-overlapping positions relative to the first throughflow hole. Moreover, locking elements are present which rotatably and releasably connect together the lower closure ring and the upper closure ring relative to one another. 
         [0010]    According to the exemplary embodiment, the soft elastic sealing material is injection-moulded on the lower closure ring and covers a circular portion surrounding the throughflow holes on the first seat surface. Moreover, on the inner periphery of the throughflow holes in each case the sealing material has a strip-shaped portion. On the lower face of the first central part, coming from the strip-shaped portions, further strip-shaped portions of the soft elastic sealing material are present, which extend down the inner face of a cylindrical portion of the first peripheral part and are connected at the bottom to an annular peripheral sealing surface made of the same material, which is arranged on the inner face of a step of the first peripheral part. The sealing material is, for example, a thermoplastic elastomer. 
         [0011]    In the known closure system, the seal is created between the lower closure ring and the upper closure ring between the circular disc-shaped soft elastic sealing material of the first seat surface of the lower closure ring and the substantially planar second seat surface of the upper closure ring, located thereon. Here, it may lead to leakages, in particular when the seat surfaces do not bear exactly against one another with a specific contact pressure. Moreover, the friction between the first seat surface made of soft elastic sealing material and the second seat surface, may hinder the rotation of the upper closure ring relative to the lower closure ring. 
         [0012]    Against this background, the object of the invention is to provide a closure system for a leakproof baby feeding bottle with improved usage properties. 
       BRIEF SUMMARY OF THE INVENTION 
       [0013]    The closure system according to the invention for a leakproof baby feeding bottle comprises
   a lower closure ring which has a substantially cylindrical lower peripheral part with an internal thread, which may be screwed onto an external thread of a bottle and comprises a lower partition connected to the lower peripheral part on the edge above the internal thread and blocking its cross section, with a first upper face and a first lower face, and at least one lower throughflow hole which opens, on the one hand, in the first upper face and, on the other hand, in the first lower face,   an upper closure ring which comprises a substantially cylindrical upper peripheral part with an external thread for connecting to a screw ring for fastening a drinking teat to the upper peripheral part and an upper partition connected to the upper peripheral part on the edge and blocking its cross section, with a second upper face and a second lower face located sealingly on the first upper face and at least one upper throughflow hole which opens, on the one hand, in the second lower face and, on the other hand, in the second upper face,   locking elements which rotatably and releasably lock together the lower closure ring and the upper closure ring relative to one another,   a circular lip seal made of a soft elastic material concentric to the lower peripheral part being arranged on the first upper face, with at least one axially oriented sealing lip and at least one circular seal geometry engaging with the lip seal and concentric to the upper peripheral part being arranged on the second lower face or vice versa and by rotating the upper closure ring relative to the lower closure ring the upper throughflow hole may be brought into overlapping and non-overlapping positions relative to the lower throughflow hole.   
 
         [0018]    The closure system according to the invention is able to be screwed by the internal thread of the lower closure ring to a leakproof baby feeding bottle. Moreover, a drinking teat is able to be screwed onto the external thread of the upper closure ring by means of a screw ring. In this case, the lower closure ring may be located sealingly on the upper edge of the bottle and the drinking teat may be located sealingly on the upper edge of the upper peripheral part of the upper closure ring. 
         [0019]    The closure rings are connected together rotatably and releasably relative to one another via the locking elements. The closure rings have one lower and at least one upper throughflow hole which, by rotating the upper closure ring relative to the lower closure ring, may be brought into overlapping and non-overlapping positions. If the at least one lower and the at least one upper throughflow hole overlap, baby food is able to be taken. If they do not overlap, the closure system blocks the removal of liquid baby food. The lower closure ring and the upper closure ring bear with the first upper face and the second lower face flat against one another, so that in principle baby food is not able to flow out between the two closure rings to the side. 
         [0020]    At least one circular lip seal and at least one circular seal geometry engaging therewith are present as an additional lateral seal of the contact region between the first upper face and the second lower face. In this case, either the lower closure ring has the at least one circular lip seal and the upper closure ring has the at least one circular seal geometry or the lower closure ring has the at least one circular seal geometry and the upper closure ring the at least one circular lip seal. It is also possible that both the upper closure ring and the lower closure ring have at least one circular lip seal and at least one circular seal geometry. The at least one circular lip seal and the at least one circular seal geometry are arranged such that they surround the lower and the upper throughflow holes. They are arranged concentrically to the lower peripheral part and the upper peripheral part, so that they do not hinder the rotation of the upper closure ring relative to the lower closure ring. By the at least one circular lip seal and the at least one circular seal geometry, the seal between the lower and upper closure rings is improved and the escape of liquid baby food to the side is prevented even more effectively. In this case, it is particularly advantageous that the axially oriented sealing lip and a corresponding seal geometry in the axial direction of the cylindrical peripheral parts engage in one another so that the lower closure ring and the upper closure ring may be easily joined together and separated from one another. 
         [0021]    The closure system according to the invention for a leakproof baby feeding bottle comprises
   a lower closure ring which has a substantially cylindrical lower peripheral part with an internal thread, which may be screwed onto an external thread of a bottle and comprises a lower partition connected to the lower peripheral part on the edge above the internal thread and blocking its cross section, with a first upper face and a first lower face and at least one lower throughflow hole which opens, on the one hand, in the first upper face and, on the other hand, in the first lower face,   an upper closure ring which comprises a substantially cylindrical upper peripheral part with an external thread for connecting to a screw ring for fastening a drinking teat to the upper peripheral part and an upper partition connected to the upper peripheral part on the edge and blocking its cross section, with a second upper face and a second lower face located sealingly on the first upper face and at least one upper throughflow hole which opens, on the one hand, in the second lower face and, on the other hand, in the second upper face,   locking elements which rotatably and releasably lock together the lower closure ring and the upper closure ring relative to one another,   at least one cake slice-shaped sealing cushion made of a soft elastic material being arranged on the first upper face of the lower partition and at least one upper throughflow hole with a sealing seat on the edge complementary to the cake-slice shape being arranged in the second lower face of the upper partition or vice versa and optionally the upper throughflow hole being able to be brought by rotating the upper closure ring relative to the lower closure ring into an overlapping position relative to the lower throughflow hole and the sealing seat into the sealed position relative to the sealing cushion.   
 
         [0026]    The closure system according to the invention is able to be screwed by the internal thread of the lower closure ring onto a leakproof baby feeding bottle. Moreover, a drinking teat is able to be screwed by means of a screw ring onto the external thread of the upper closure ring. In this case, the lower closure ring is able to be located sealingly on the upper edge of the bottle and the drinking teat is able to be located sealingly on the upper edge of the upper peripheral part of the upper closure ring. 
         [0027]    The closure rings are connected together rotatably and releasably relative to one another via the locking elements. The closure rings have one lower and at least one upper throughflow hole which, by rotating the upper closure ring relative to the lower closure ring, may be brought into overlapping and non-overlapping positions. If the at least one lower and the at least one upper throughflow hole overlap, baby food is able to be removed. If they do not overlap, the closure system blocks the removal of liquid baby food. The lower closure ring and the upper closure ring bear with the first upper face and the second lower face flat against one another so that, in principle, baby food is not able to flow out to the side between the two closure rings. 
         [0028]    If the upper closure ring is rotated relative to the lower closure ring such that it is arranged with the one sealing seat in a sealed position relative to the at least one sealing cushion, the throughflow of liquid baby food is prevented through the at least one lower throughflow hole and the at least one upper throughflow hole. At the same time, therefore, it is prevented that liquid baby food escapes to the side through the contact region between the first upper face of the lower partition and the second lower face of the upper partition. The at least one sealing cushion is arranged either on the first upper face of the lower partition and the at least one sealing seat is arranged on the second lower face of the upper partition or the at least one sealing cushion is arranged on the second lower face of the upper partition and the at least one sealing seat is arranged on the first upper face of the lower partition. Moreover, the invention incorporates possible embodiments in which the lower partition comprises at least one cake slice-shaped sealing cushion and at least one cake slice-shaped sealing seat and the upper partition at least one sealing cushion complementary thereto and at least one sealing seat complementary to the at least one cake slice-shaped sealing cushion of the lower partition. 
         [0029]    The cake-slice shape of the sealing cushion and the sealing seat complementary thereto promote a particularly advantageous shape of the throughflow holes for the removal of liquid baby food and a particularly sealed seal of said throughflow holes. According to a preferred embodiment, the sealing seat is a peripheral edge about the at least one upper throughflow hole, against which the sealing cushion sealingly bears on the edge, when the sealing seat is brought into the sealed position relative to the sealing cushion. The edge is able to be produced with a particularly dimensionally stable or respectively smooth surface. Preferably, it is a chamfer or respectively bevel on the edge of the throughflow hole, into which the sealing cushion is pressed, said sealing cushion bearing sealingly with its edge against the chamfer or bevel. 
         [0030]    According to an embodiment of the invention, the outflow of liquid food to the side between the upper and lower closure part is also reliably prevented, when the lower and upper throughflow holes overlap one another. 
         [0031]    According to a preferred embodiment which further improves the seal on the edge, the lip seal is a double lip seal. 
         [0032]    According to a further embodiment which improves the removal of liquid food and the seal of the closure rings, the lower closure ring and the upper closure ring in each case comprise two diametrically opposing throughflow holes and/or the lower closure ring comprises two diametrically opposing cake slice-shaped sealing cushions and the upper closure ring comprises two diametrically opposing throughflow holes with a sealing seat on the edge or vice versa. 
         [0033]    The locking elements may be designed in different ways. According to a preferred embodiment, they are parts of a bayonet closure. A bayonet closure permits a simple connection of the closure ring and the upper closure ring with one another and also allows the user the easy separation of the lower and upper closure ring. 
         [0034]    According to a further embodiment, the lower closure ring above the internal thread comprises a circular peripheral sealing element made of a soft elastic material for sealing to the upper edge of a bottle. As a result, the sealing seat of the closure system on the bottle is assisted. In principle, however, it is also possible to insert a specific sealing ring between the closure system and the bottle. 
         [0035]    According to a preferred embodiment, the sealing element is circular disc-shaped. 
         [0036]    According to a further embodiment, the lip seal and the sealing element consist of a soft elastic material which extends from the lip seal over the first upper face of the lower partition and through the lower through-holes as far as the sealing element. The sealing elements may then be injection-moulded continuously on the lower closure ring. This is advantageous in terms of production technology. 
         [0037]    According to one embodiment, the lower and/or upper closure ring comprising the lip seal and/or the sealing cushion and/or the sealing element is produced in a two-component injection-moulding process from a soft elastic plastics component for the lip seal and/or the sealing cushion and/or the sealing element and also from a hard elastic plastics component. The two-component-injection moulding process may be, in particular, a core retraction process or a transfer process. 
         [0038]    According to a further embodiment, the lip seal and/or the sealing cushion and/or the sealing element consist of thermoplastic elastomer. The production from thermoplastic elastomer promotes, in particular, the material connection between the lip seal and/or sealing cushion and/or sealing element with the remaining parts of the lower and/or upper closure ring. Basically, it is also possible to connect the lip seal and/or the sealing cushion and/or the sealing element positively and/or non-positively to the remaining parts of the lower and/or closure ring. This applies both to the embodiments of these seals made of thermoplastic elastomer and to possible embodiments of these seals made of a different sealing material, such as for example rubber or silicone. 
         [0039]    According to a preferred embodiment, the first upper face is planar and the second lower face is planar. It is further preferred if the first lower face and the second upper face are planar. 
         [0040]    According to a further embodiment, the lower closure ring is screwed onto a baby feeding bottle. 
         [0041]    According to a further embodiment a drinking teat is held by means of a screw ring on the upper closure ring. 
     
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
         [0042]    The invention is described in more detail hereinafter with reference to the accompanying drawings of an exemplary embodiment. In the drawings: 
           [0043]      FIG. 1  shows a closure system screwed onto a baby feeding bottle with a screwed-on drinking teat in a vertical section; 
           [0044]      FIGS. 2   a  to  e  show the same closure system in side view ( FIG. 2   a ), in a view from the left-hand side ( FIG. 2   b ), in a view from the right-hand side ( FIG. 2   c ), in a view from below ( FIG. 2   d ) and in plan view ( FIG. 2   e ); 
           [0045]      FIGS. 3   a  to  g  show the lower closure ring of the same closure system in front view ( FIG. 3   a ), in a view from the right-hand side ( FIG. 3   b ), in plan view ( FIG. 3   c ), in a view from below ( FIG. 3   d ), in a section along the line A-A of  FIG. 3   b  ( FIG. 3   e ), in a section along the line B-B of  FIG. 3   a  ( FIG. 3   f ) and in a perspective view obliquely from above and from the side ( FIG. 3   g ); 
           [0046]      FIGS. 4   a  to  f  show the upper closure ring of the same closure system in front view ( FIG. 4   a ), in a view from the right-hand side ( FIG. 4   b ), in plan view ( FIG. 4   c ), in a view from below ( FIG. 4   d ), in a section along the line B-B of  FIG. 4   a  ( FIG. 4   e ), in a section along the line C-C of  FIG. 4   a  ( FIG. 4   f ) and in a perspective view obliquely from above and from the side ( FIG. 4   g ). 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0047]    While this invention may be embodied in many different forms, there are described in detail herein a specific preferred embodiment of the invention. This description is an exemplification of the principles of the invention and is not intended to limit the invention to the particular embodiment illustrated. 
         [0048]    In the present application, the terms “top” and “bottom” refer to the alignment of the closure system if said closure system is screwed onto a bottle and is screwed to a drinking teat, the bottle being vertically aligned and being positioned with the base on a surface and the drinking teat being arranged above the bottle. 
         [0049]    According to  FIG. 1  a closure system  20  comprising a lower closure ring  30  and an upper closure ring  60  is screwed onto a baby feeding bottle  10 , and a drinking teat  100  is screwed onto the closure system  20  by means of a screw ring  90 . 
         [0050]    The bottle  10  has a cylindrical, waisted bottle body  11  which comprises a base  12  at the lower end and a neck  13  at the upper end. The neck  13  is designed as a wide neck but has a smaller diameter than the region of the bottle body  11  located therebelow. The neck  13  has a single-flight external bottle thread  14  and at the top has a bottle opening  15 . The bottle opening  15  is surrounded by an upper bottle edge  16 . The bottle  10  has a longitudinal centre axis  17 . 
         [0051]    As visible in particular from  FIGS. 2 and 3 , the lower closure ring  30  has a substantially cylindrical lower peripheral part  31  which comprises a plurality of portions. The first lower peripheral part portion  32  of substantially cylindrical shape has an internal thread  33  on the internal periphery, which according to  FIG. 1  is screwed onto the external bottle thread  14 . A second lower peripheral part portion  34  protrudes radially outwards and downwards from the periphery of the first lower peripheral part portion  32 , and which covers the bottle neck  13  to the side. 
         [0052]    Moreover, the lower peripheral part  31  has a third lower peripheral part portion  35  protruding radially inwards from the upper edge of the first lower peripheral part portion  22 , which is substantially circular disc-shaped. A substantially cylindrical fourth lower peripheral part portion  36  protrudes axially upwards from the inside of the third lower peripheral part portion  35 . 
         [0053]    A lower partition  37  is connected to the upper edge of the fourth upper peripheral part portion  36 , and which substantially blocks the cross section of the lower closure ring  30 . 
         [0054]    Said circular disc-shaped partition  37  has a substantially planar first upper face  38  and a substantially planar first lower face  39 . Moreover, it comprises diametrically opposing lower cake slice-shaped throughflow holes  40 ,  41  which extend from the first upper face  38  as far as the first lower face  39 . 
         [0055]    The first upper face  38  is surrounded by a circular double lip seal  42 , the sealing lips  43 ,  44  thereof extending upwards perpendicular to the first upper face  38 . The double lip seal may also be denoted as a “double-lamella seal”. Moreover, two diametrically opposing cake slice-shaped sealing cushions  45 ,  46  are arranged on the first upper face  38 , said diametrically opposing cake slice-shaped sealing cushions being arranged on the angle bisector between the two lower cake slice-shaped lower throughflow holes  40 ,  41 . 
         [0056]    The cake slice-shaped throughflow holes  40 ,  41  and the cake slice-shaped sealing cushions  45 ,  46  widen at an increasing distance from the centre of the circular disc-shaped partition  37 . 
         [0057]    Moreover, the closure ring on the lower face of the second lower peripheral part portion has a circular disc-shaped sealing element  47 . 
         [0058]    Moreover, the lower closure ring  30  on the outer periphery of the first lower peripheral part portion  32  has two opposing longitudinal grooves  48 ,  49  which in each case are connected to an annular groove  50 ,  51 , which at the bottom is defined by the second lower peripheral part portion  34 . Adjacent to each longitudinal groove  48 ,  49  in the respective adjacent annular groove  50 ,  51  a latching projection  52 ,  53  is present in each case. The latching projections  52 ,  53  have in each case a chamfer toward the longitudinal sides  48 ,  49  and/or the annular grooves  50 ,  51 . The annular grooves  50 ,  51  are in each case defined on the opposing ends by stops  54 ,  55 , which at the same time separate the annular grooves  50 ,  51  from the adjacent longitudinal grooves  48 ,  49 . 
         [0059]    On the second lower peripheral part portion externally on diametrically opposing peripheral regions, in each case are two semi-circular lower raised portions  56 ,  57  with the printed text “press open”. By pressing against the semi-circular lower raised portion  56 ,  57 , it is possible to displace the latching projections  52 ,  53 , arranged adjacent thereto, slightly inwards. 
         [0060]    The lower closure ring  30  is, in principle, produced from a hard elastic plastics material, for example from polypropylene (PP). A soft elastic sealing material is injection-moulded on the lower closure ring  30  which forms the double lip seal  42 , the sealing cushions  45 ,  46  and the sealing element  47 . The sealing material is injection-moulded such that it connects all the aforementioned seals  42 ,  45 ,  46 ,  47  together. For example, it is a thermoplastic elastomer (TPE). 
         [0061]    According to  FIGS. 2 and 4 , the upper closure ring  60  has an upper peripheral part  61  with a plurality of portions. The substantially cylindrical first upper peripheral part portion  62  has an external thread  63  on the external periphery. The first upper peripheral part portion  62  is connected on the lower edge to a second upper peripheral part portion  64  protruding radially outwards. The second upper peripheral part portion  64  is connected in turn on the external periphery to a third upper peripheral part portion  65  protruding axially downwards. The third upper peripheral part portion  65  has on the inner periphery two protruding claws  66 ,  67  which diametrically oppose one another. On the outside, the third upper peripheral part portion  65  has two semi-circular upper raised portions  68 ,  69  protruding radially outwards, which also diametrically oppose one another. The upper raised portions  68 ,  69  are offset by 90° relative to the claws  66 ,  67 . 
         [0062]    
       5 
     
         [0063]    Moreover, the upper closure ring  60  comprises a circular disc-shaped upper partition  70  which, slightly below the upper edge of the first upper peripheral part portion  62 , is connected thereto and blocks the cross section of the upper peripheral part  61 . The upper partition  70  has a substantially planar second upper face  71  and a substantially planar second lower face  72 . Moreover, it has diametrically opposing cake slice-shaped upper through-holes  73 ,  74 , which in each case open into the second upper face  71  and into the second lower face  72 . The upper through holes  73 ,  74  diametrically oppose one another. 
         [0064]    On the second lower face  72 , the upper partition  70  has a circular seal geometry  75  complementary to the double lip seal. This seal geometry  75  has two circular peripheral sealing grooves  76 ,  77 , into which the sealing lips  43 ,  44  of the double lip seal  42  are able to engage. The seal geometry  75  is arranged concentrically to the first upper peripheral part  61  and to the circular disc-shaped upper partition  70 . 
         [0065]    The upper closure ring is, for example, produced from PP. 
         [0066]    The upper closure ring  60  is able to be inserted with the claws  66 ,  67  into the longitudinal grooves  48 ,  49  of the lower closure ring  30 , until the claws  66 ,  67  strike against the second lower peripheral part portion  34 . In this case, the double lip seal  42  engages in the sealing grooves  76 ,  77  of the seal geometry  75 . By rotating the upper closure ring  60  by approximately 15° the claws  66 ,  67  of the upper closure ring  60  spring over the latching projections  52 ,  53  of the lower closure ring  30  so that the lower and the upper closure ring  30 ,  60  are captively connected together. If the claws  66 ,  67  have sprung over the latching projections  52 ,  53 , the lower and upper through-holes  40 ,  41  and  73 ,  74  are in an overlapping position in which liquid is able to pass through the closure system  20 . This position is shown in  FIG. 1 . 
         [0067]    By further rotation of the upper closure ring  60  relative to the lower closure ring  30  until the claws  66 ,  67  strike against the stops  55 ,  56 , the upper throughflow holes  73 ,  74  are sealed by the sealing cushions  45 ,  46  of the lower closure ring  30 . In this case, the sealing cushions  45 ,  46  bear sealingly on the edge against chamfers or respectively bevels on the edge of the throughflow holes  73 ,  74 , which form sealing seats. The closure system  20  is then closed and liquid is not able to pass through the through-holes  40 ,  41 ,  73 ,  74 . At the moment of closure, the closure system  20  emits an acoustic clicking noise. 
         [0068]    The closure system  20  is opened again by the upper closure ring  60  being rotated in the opposing direction until it reaches the position in which the claws strike against the latching projections  55 ,  56 . This stop position can only be overcome when the lower closure ring is deformed by compressing the two semi-circular lower raised portions  56 ,  57 . The lower closure ring  30  may only be deformed when the closure system  20  has been screwed off the bottle  10 . The upper raised portions  68 ,  69  on the upper closure ring  60  simplify the rotation of the upper closure ring  60  relative to the lower closure ring  30 . Moreover, with a suitable arrangement of specific positions, they may display, for example, the position in which the claws  66 ,  67  engage in the longitudinal grooves  48 ,  49 . 
         [0069]    According to  FIG. 1 , the screw ring  90  has a circular cylindrical annular portion  91  with an internal screw ring thread  92  on the inner periphery and an annular flange  93  protruding radially inwards from the upper edge, with a screw ring-annular groove  94  on the lower face. The screw ring  90  is screwed to the external thread  63 . The annular flange  93  is pressed against the upper edge of the second closure ring. 
         [0070]    The screw ring may comprise on the outer periphery a coating  95  made of a soft elastic plastics material. It is, for example, injection-moulded from PP and the soft elastic material is, for example, injection-moulded TPE. 
         [0071]    According to  FIG. 1  the drinking teat  100  has a mouthpiece  101  with a slotted valve  102  and a teat  103  with a drinking hole  104  and/or drinking slot at the end and a spout  105  carrying the mouthpiece  101 . On the lower edge of the spout  105  it has an outwardly oriented teat flange  106  with an upwardly protruding sealing bead  107 . The drinking teat  100  is, for example, produced from rubber and/or latex or silicone rubber. 
         [0072]    According to  FIG. 1 , the drinking teat  100  is clamped on the teat flange  106  between the upper edge of the upper closure ring  60  and screw ring  90 . The sealing bead  107  is fixed in the screw ring-annular groove  94  to the lower face of the annular flange  93 . 
         [0073]    The screw ring  90  in the closed or open state of the closure system  20  may be screwed onto the closure system or respectively screwed off said closure system. 
         [0074]    The novel closure system  20  may be moved by means of rotational movement from the closed state into the open state and vice versa. No individual parts have to be removed in order to bring the closure system  20  into the operative state. Also there is no direct contact with the user and with the food when opening and closing the closure system  20 . The risk of contamination of the food is thus considerably reduced. Moreover, it is not possible to lose any individual parts. The closure system  20  can be used for bottles  10  and other containers. 
         [0075]    This completes the description of the preferred and alternate embodiments of the invention. Those skilled in the art may recognize other equivalents to the specific embodiment described herein which equivalents are intended to be encompassed by the claims attached hereto.