EP2628689B1 - Push-pull closure for a beverage container - Google Patents

Description

The invention relates to a push-pull closure for a drinking container, in particular for a drinking bottle or a drinking cup.

A push-pull closure (push-pull closure) has an externally accessible mouthpiece, which is arranged to be axially displaceable on a mouthpiece holder that can be connected to the drinking container. The mouthpiece is reciprocable with the teeth or by hand between an open and a closed position. In most cases, the closure is closed by pushing the mouthpiece deeper into the mouthpiece holder (push) and opening it by pulling the mouthpiece further out of the mouthpiece holder (pull). Such push-pull closures are characterized in that the hands are generally not required for the opening and closing of the closure. Therefore, they are in particular in the field of sports, such as bottles for cycling, widely used. Because of the ease of use, push-pull closures are also popular with many recreational activities and drinking containers for children.

The FR 2 731 680 A describes a push-pull closure according to the preamble of claim 1, which has a closure cap for snapping onto a drinking bottle. A mouthpiece is movably disposed within a collar and capable of assuming a closed position, a maximum open position and a middle open position. Further, the closure has means to temporarily block the mouthpiece with respect to the collar in a desired position. These means are arranged on the outside of the mouthpiece and are suitable for coming into contact with the inner wall of the closure cap. The means for blocking comprise cams projecting from the circumference of the mouthpiece, which in the maximum opening position come into contact with a flat upper abutment surface on the underside of the closure cap. The cams point to the Bottom of a bevel on to facilitate the insertion of the mouthpiece in the collar. Disassembly of the mouthpiece requires a pull under very high force with severe deformation or destruction of the cam.

The DE 10 2008 023 904 B4 describes a push-pull closure for a drinking container with a mouthpiece holder designated as a body element, which has a passage opening and a fastening device, with which it can be sealingly and detachably connected to an opening of the drinking container. The closure comprises a mouthpiece with a passage opening for a drink, which is axially displaceable in the through hole of the mouthpiece holder and which has at least one locking portion which can engage behind the through hole of the mouthpiece holder. In addition, a locking element is provided which is detachably attachable to the inside of the mouthpiece holder facing the drinking container. The locking element is arranged so that it at least partially protrudes into the passage opening of the mouthpiece. A gap between the locking member and mouthpiece is sized so that the locking portion of the mouthpiece can not assume a position in which it does not engage behind the through hole of the mouthpiece holder when the mouthpiece is inserted into the through hole and the locking member is attached to the inside of the mouthpiece holder. The closure is easy to clean and prevents inadvertent, complete withdrawal of the mouthpiece. This is to prevent in particular that the mouthpiece is pulled out and swallowed by a small child. Due to its composition of a mouthpiece holder, a mouthpiece and a locking element its manufacture and its assembly and disassembly into parts are relatively expensive.

Based on this, the present invention seeks to provide a push-pull closure that effectively prevents unintentional, complete withdrawal of the mouthpiece, less expensive to produce and easier to assemble and disassemble.

• einen Mundstückhalter, der eine Durchgangsöffnung und Mittel zum Halten aufweist, mit denen er abdichtend und lösbar am Rand einer Öffnung des Trinkbehälters befestigbar ist,
• einen Zapfen, der in die Durchgangsöffnung des Mundstückhalters hineinsteht, wobei zwischen dem Zapfen und der Durchgangsöffnung des Mundstückhalters ein umlaufender Spalt vorhanden ist,
• mehrere parallel zum Zapfen um den Zapfen herum angeordnete Stege, die oben mit dem Mundstückhalter und unten mit dem Zapfen verbunden sind,
• ein Mundstück mit einer weiteren Durchgangsöffnung für ein Getränk, das axial verschieblich, am Außenumfang gegenüber der Durchgangsöffnung abdichtend und den Zapfen in der weiteren Durchgangsöffnung aufnehmend in den umlaufenden Spalt einsetzbar ist,
• mindestens ein umlaufendes Dichtelement zwischen dem Zapfen und der weiteren Durchgangsöffnung, das in einer Schließstellung des Mundstückes im Mundstückhalter den Durchgang von Flüssigkeit durch die weitere Durchgangsöffnung versperrt und in einer Öffnungsstellung des Mundstückes im Mundstückhalter den Durchgang von Flüssigkeit durch die weitere Durchgangsöffnung freigibt, und
• mehrere unten auf dem Umfang des Mundstückes axial erstreckte Rippen aus einem weichelastischen Material, zwischen denen axial erstreckte Freiräume vorhanden sind, wobei das Mundstück in den Mundstückhalter einsetzbar ist, sodass die Stege in die Freiräume eingreifen und die Rippen in Aussparungen zwischen den Stegen eingreifen, am oberen Rand der Rippen vorhandene Anschlagflächen in einer oberen Stellung des Mundstückes an der Unterseite des Mundstückhalters anliegen und bei einem Drehen des Mundstückes bezüglich des Mundstückhalters die Stege benachbarte Rippen in die Freiräume umbiegen und das Mundstück unter verringerter Auszugskraft aus der Durchgangsöffnung herausziehbar ist.

The push-pull closure according to the invention for a drinking container has

• a mouthpiece holder having a passage opening and means for holding, with which it can be fastened sealingly and detachably on the edge of an opening of the drinking container,
• a pin which projects into the passage opening of the mouthpiece holder, wherein there is a circumferential gap between the pin and the passage opening of the mouthpiece holder,
• a plurality of webs arranged around the pin parallel to the pin, which are connected at the top to the mouthpiece holder and at the bottom to the pin,
• a mouthpiece with a further passage opening for a drink, which is axially displaceable, sealingly insertable on the outer circumference in relation to the passage opening and receiving the pin in the further passage opening,
• at least one circumferential sealing element between the pin and the further passage opening, which in a closed position of the mouthpiece in the mouthpiece holder obstructs the passage of liquid through the further passage opening and releases the passage of liquid through the further passage opening in an opening position of the mouthpiece in the mouthpiece holder, and
• a plurality of ribs, which extend axially downwards on the circumference of the mouthpiece and are made of a soft-elastic material, between which axially extended free spaces are provided, the mouthpiece being insertable into the mouthpiece holder, so that the webs engage in the free spaces and the ribs engage in recesses between the webs, abut the upper edge of the ribs existing abutment surfaces in an upper position of the mouthpiece on the underside of the mouthpiece holder and upon rotation of the mouthpiece with respect to the mouthpiece holder, the webs adjacent ribs in bend the free spaces and the mouthpiece is pulled out of the passage opening under reduced pull-out force.

In the push-pull closure according to the invention, the mouthpiece is sealed on the outer circumference with respect to the passage opening in the mouthpiece holder. Further, the mouthpiece is axially displaceable in a closed position in which seals at least one circumferential sealing element between the pin and the further passage opening, so that liquid can not pass through the further passage opening, ie the push-pull closure does not pass liquid. Further, the mouthpiece is axially displaceable in an opening position in the mouthpiece holder, in which the sealing element releases the further passage opening and liquid can be removed from a drinking container by the push-pull closure. Preferably, the closed position is a lower position of the mouthpiece and the open position is an upper position of the mouthpiece in the mouthpiece holder. Further, the mouthpiece is secured in the mouthpiece holder by abutment surfaces formed at the upper edge of the ribs. Namely, these abutment surfaces are in an upper position of the mouthpiece in the mouthpiece holder on the underside of the mouthpiece holder and prevent the ribs from passing through the through-opening. Preferably, the stop surfaces are surfaces which are aligned perpendicular to the central axis of the passage opening or the mouthpiece. The abutment surfaces are anyway designed so that a high pull-out force is applied to pull the mouthpiece out of the mouthpiece holder. Preferred is this one Extracting force of at least 65 Newtons. With a sufficiently high pull-out strength ensures that the mouthpiece can not be inadvertently pulled out and swallowed especially by small children. Nevertheless, the closure is easily removable for cleaning purposes. For this purpose, the webs engage in the free spaces between the ribs and the ribs in the recesses between the webs. As a result, upon rotation of the mouthpiece in the mouthpiece holder, the lands press adjacent ribs into adjacent clearances. Then the ribs are closer to the mouthpiece, so that the mouthpiece with reduced pull-out force can be pulled out through the through hole. It is advantageous if the mouthpiece is rotated when pulling out on a screw, so that the ribs are created by superimposed bending by means of the webs and pulling it into the through hole flat to the mouthpiece. Thus, the push-pull closure by intentionally superimposed twisting and pulling apart mouthpiece and mouthpiece holder can be dismantled into its individual parts. Unintentional pulling out of the mouthpiece or pulling out by a small child is thereby avoided. When the soft-elastic ribs are pulled out of the passage opening of the mouthpiece holder, they return to their undeformed starting position.

According to one embodiment, the mouthpiece holder has a sleeve-shaped section, through which the passage opening extends. The sleeve-shaped portion advantageously forms a guide for the mouthpiece and an area for sealingly holding the mouthpiece in the mouthpiece holder.

The passage opening is preferably arranged centrally in the mouthpiece holder. But it is also possible to arrange the passage opening eccentrically in the mouthpiece holder.

According to a further embodiment, the spigot has a lower spigot portion with an enlarged diameter and / or the mouthpiece at the top an upper opening portion of the further passage opening with a reduced diameter and is in the closed position the mouthpiece with a lower opening portion of the further passage opening sealingly on the lower spigot portion and / or the pin is sealingly connected to an upper pin portion at the upper opening portion of the further passage opening. As a result, the further passage opening is effectively sealed. Preferably, both seals between lower pin portion and lower portion of the through hole as well as between upper portion of the through hole and upper pin portion are used.

According to a further embodiment, the pin has on the outside further axially extending ribs of a soft elastic material, between which further axially extending free spaces are present. The other ribs favor high pull-out forces for axial extraction of the mouthpiece from the mouthpiece holder and a reduction in forces for assembly and disassembly by superimposed unscrewing and pulling the mouthpiece out of the mouthpiece holder. The pull-out forces are particularly high when the other ribs are arranged directly inserted radially below the ribs with inserted mouthpiece, so that they support the ribs inside. To facilitate assembly, the ribs can be pushed over the other spaces between the other ribs, so that they are not supported on the inside and can deform radially inward. Furthermore, during disassembly, the ribs are easier to bend over the other free spaces because there the mouthpiece is not supported from the inside.

According to a further embodiment, the cross section of the pin gradually increases from top to bottom. As a result, the sealing of the mouthpiece in the mouthpiece holder is further improved.

According to a further embodiment, the pin of a disc is high and the webs are connected to the circumference of the disc. The disc is preferably an annular disc. This structure is particularly advantageous for producing the mouthpiece holder by injection molding.

According to a further embodiment, the mouthpiece has a bead on the outside at the upper end and / or the mouthpiece has at least one peripheral sealing projection between the upper and the lower end on the outer circumference, which rests against the passage opening when the mouthpiece is inserted into the passage opening. The bead facilitates the opening of the closure with the teeth and the sealing projection causes a good seal of the mouthpiece in the through hole.

Preferably, the mouthpiece is provided below the bead with a further circumferential sealing projection which seals in the closed position of the mouthpiece in the mouthpiece holder at the upper edge of the passage opening. As a result, an additional seal is achieved in the closed position.

Preferably, the sealing projections are made of a soft elastic material.

According to a further embodiment, two circumferential sealing projections are provided at an axial distance from each other on the outer circumference of the mouthpiece. Preferably, the two sealing projections are so on the circumference of the mouthpiece arranged that in a cleaning position of the mouthpiece within the mouthpiece holder only a sealing projection sealingly abuts the through hole and a cleaning medium can be introduced from both sides through a gap between the mouthpiece and through hole.

According to a further embodiment, the passage opening at the upper end has an upper insertion bevel and / or the axial ribs have a height which decreases toward their lower end. As a result, the insertion of the mouthpiece is facilitated in the mouthpiece holder.

According to a further embodiment, the height of the axial ribs is at least as large as its width. This facilitates the targeted bending of the axial ribs in the free spaces to pull the mouthpiece out of the through hole of the mouthpiece holder.

According to a further embodiment, the number of axially extending ribs is an integer multiple of the number of ribs. This ensures that the ribs are always placeable between the webs. For this purpose, ribs are preferably evenly distributed over the circumference of the mouthpiece and the webs distributed uniformly around the pin.

According to a further embodiment, the mouthpiece 9 to 18, preferably 12 axially extending ribs and / or the mouthpiece holder 3 to 6, preferably 3 webs.

According to a further embodiment, the axially extending ribs on the two outer longitudinal edges and / or the webs on the two inner longitudinal edges bevels on. The chamfers becomes one Self-centering of the mouthpiece on the bars achieved during assembly. In addition, the bending of the ribs in the free spaces and thus the targeted release of the mouthpiece is facilitated by the mouthpiece holder.

According to a further embodiment, the spacing of the chamfers of the axially extended ribs decreases from the base of the axially extended ribs to the lower end of the ribs. This facilitates the gradual bending of the ribs from the lower end to the upper end of the ribs.

According to a further embodiment, the axially extending ribs at the lower end a directed perpendicular to the central axis of the passage opening lower insertion bevel. The insertion bevel facilitates the installation of the mouthpiece in the mouthpiece holder.

According to a further embodiment, the mouthpiece and / or the mouthpiece holder each consist overall of a soft-elastic material. Preferably, the mouthpiece and / or the mouthpiece holder are each made of silicone rubber. Alternatively, the mouthpiece and / or the mouthpiece holder are made of a thermoplastic elastomer. Preferably, the mouthpiece and / or the mouthpiece holder are each in one piece. Further preferably, the mouthpiece and / or the mouthpiece holder are produced by injection molding.

Fig. 1a-h

einen Push-Pull-Verschluss in Schließstellung in Seitenansicht (Fig. 1a), in einer um 45° gegenüber Fig. 1a gedrehten Seitenansicht (Fig. 1b), in einem Schnitt entlang der Linie C-C von Fig. 1b (Fig. 1c), in einer Draufsicht (Fig. 1d), in einer Unteransicht (Fig. 1e), in einer Perspektivansicht schräg von oben und von der Seite (Fig. 1f), in einem Schnitt entlang der Linie H-H von Fig. 1d (Fig. 1g) und in einem vergrößerten Schnitt entlang der Linie I-I von Fig. 1g (Fig. 1h);

Fig. 2a-f

denselben Push-Pull-Verschluss in Öffnungsstellung in einer Ansicht entgegengesetzt zu der Ansicht von Fig. 1b (Fig. 2a), in einem Schnitt entlang der Linie B-B von Fig. 2a (Fig. 2b), in einem Schnitt entlang der Linie J-J von Fig. 2b (Fig. 2c), in einem vergrößerten Ausschnitt G von Fig. 2b (Fig. 2d), in einer Perspektivansicht schräg von unten und von der Seite (Fig. 2e) und in einem vergrößerten Ausschnitt E von Fig. 2e (Fig. 2f);

Fig. 3a-b

denselben Push-Pull-Verschluss in einer Reinigungsstellung in einer Ansicht gemäß Fig. 2 (Fig. 3a) und in einem Schnitt entlang der Linie K-K von Fig. 3a (Fig. 3b);

Fig. 4

Diagramm mit den für das rein axiale Herausziehen des Mundstückes aus dem Mundstückhalter aufzuwendenden Auszugskräften auf der Ordinate und der Anzahl der Auszüge auf der Abszisse bei Versuchen mit mehreren gleichen Push-Pull-Verschlüssen.

The invention will be explained in more detail with reference to the accompanying drawings of an embodiment. In the drawings show:

Fig. 1a-h

a push-pull closure in the closed position in side view ( Fig. 1a ), in a 45 ° opposite Fig. 1a twisted Side view ( Fig. 1b ), in a section along the line CC of Fig. 1b (Fig. 1c ), in a plan view ( Fig. 1d ), in a bottom view ( Fig. 1e ), in a perspective view obliquely from above and from the side ( Fig. 1f ), in a section along the line HH of Fig. 1d ( Fig. 1g ) and in an enlarged section along the line II of Fig. 1g (Fig. 1h );

Fig. 2a-f

the same push-pull closure in the open position in a view opposite to the view of Fig. 1b ( Fig. 2a ), in a section along the line BB of Fig. 2a (Fig. 2b ), in a section along the line JJ of Fig. 2b (Fig. 2c ), in an enlarged section G of Fig. 2b (Fig. 2d ), in a perspective view obliquely from below and from the side ( Fig. 2e ) and in an enlarged section E of Fig. 2e (Fig. 2f );

Fig. 3a-b

the same push-pull closure in a cleaning position in a view according to Fig. 2 ( Fig. 3a ) and in a section along the line KK of Fig. 3a (Fig. 3b );

Fig. 4

Diagram showing the extraction forces on the ordinate to be used for the purely axial extraction of the mouthpiece from the mouthpiece holder and the number of separations on the abscissa in experiments with several identical push-pull closures.

In the present application, the statements "top" and "bottom" refer to an arrangement of the push-pull closure on top of a drinking container.

According to Fig. 1 and 2 The push-pull closure 1 according to the invention comprises a mouthpiece holder 2 and a mouthpiece 3.

The mouthpiece holder 2 has a dome-shaped top wall 4 and a peripheral annular flange 5 projecting outwardly from the outer edge of the top wall 4. Further, the mouthpiece holder 2 has a vertical, sleeve-shaped portion 6, which is arranged on the apex of the top wall 4. The sleeve-shaped portion 6 projects far above and below only a small piece on the top wall 4 addition. In the sleeve-shaped portion 6, a circular cylindrical passage opening 7 is present. The passage opening 7 has at the upper end an insertion bevel 8 in which it expands there conically over a short section upwards.

From the bottom of the mouthpiece holder 2 projecting three webs 9, which are distributed parallel to the through hole 7 and evenly around them. The webs 9 are connected to the top of the underside of the top wall 4 projecting part of the sleeve-shaped portion 6 and an adjacent region of the top wall 4. They have a rectangular cross-section. The webs 9 are arranged so that their inner edges are aligned with the through hole 7. Between the webs 5 recesses 10 are present.

At the lower end, the webs are connected to the annular disc 11. From the inner edge of the disc 11 is vertically upwards a pin 12 upwards. Below the pin 12 has a lower pin portion 13 with an enlarged diameter. The lower pin portion 13 has a conical, upwardly slightly tapered shape. Next, the pin 12 has an upper pin portion 14, which also has an upwardly tapering, conical shape. The cone angles of the lower and upper pin sections 13, 14 are very small.

The upper pin portion 14 has adjacent to the lower pin portion 13 on the circumference axially extending further ribs 15, between which axially extended further spaces 16 are present. In the example, twelve further ribs 15 and, accordingly, twelve further, groove-like free spaces 16 are present. The further ribs 15 have a trapezoidal or wave-shaped cross section. Their outer edges fall into an imaginary, upwardly tapering conical surface.

The further ribs 15 terminate at a distance from the upper end of the pin 12, so that the pin 12 at the upper end on the outer circumference is smooth.

The mouthpiece 3 is substantially circular cylindrical. Inside it has another circular cylindrical passage opening 17. The further passage opening 17 has a short upper opening portion 18 with a reduced diameter. In the upper opening portion, a circumferential bead-like inner sealing projection 10 is provided. This is dimensioned so that the upper opening portion 18 is sealingly slidable on the upper end of the upper pin portion 14 can be pushed. The further passage opening 17 has an inner diameter which is dimensioned so that it can be pushed with its lower end sealingly on the lower pin portion 13.

The mouthpiece 3 has at the upper end outside an outwardly projecting bead 20 which is rounded at the outer periphery.

Below the bead 20, the mouthpiece 3 has a short conical sealing projection 21 on the outer circumference.

Approximately in the middle, the mouthpiece 3 on the outside a circumferential, bead-like outer sealing projection 22.

Furthermore, the mouthpiece 3 has approximately in the middle of the lower half outside another circumferential, bead-like outer sealing projection 23rd

Underneath, the mouthpiece 3 has on the outer circumference a plurality of radially outwardly projecting, axially extended ribs 24. The ribs are distributed uniformly over the circumference. Between adjacent ribs 24 each axially extending free spaces 25 are present, which are groove-like in the example. In the example twelve ribs 24 and twelve free spaces 25 are present.

The ribs 24 each have a flat stop surface 26, which is aligned perpendicular to the central axis of the mouthpiece 3.

Below each rib 24 has at its two outer longitudinal edges a bevel 27, 28 (see. Fig. 2f ) on. The chamfers 27, 28 are flat surfaces. The spacing of the chamfers 27, 28 from the base of the ribs 24 decreases toward the lower end of the ribs 24.

Furthermore, each rib 24 has below another insertion bevel 29, which is here formed by a flat surface, which is aligned perpendicular to a plane containing the central axis of the mouthpiece 3. The bevels 27, 28 are arranged on both sides of the further insertion bevel 29.

The maximum height of each rib 24 exceeds its width. Furthermore, the maximum height of each rib 24 corresponds to the width of the adjacent free space 25.

The mouthpiece holder 2 and the mouthpiece 3 are each made in one piece from silicone, preferably by injection molding.

For the assembly of the push-pull closure 1, the lower end of the mouthpiece 3 is inserted into the upper end of the sleeve-shaped section 6. Due to the insertion bevels 8, 29, the mouthpiece 3 can be inserted well into the passage opening 7. Here, the ribs 24 are radially elastically compressed until they emerge from the lower end of the sleeve-shaped portion 6 in the recesses 10 between the webs 9. There they take their original form.

The mouthpiece 3 is rotatable in the mouthpiece holder 2 such that the three webs 9 each engage in a clearance 25 between a pair of adjacent ribs 24.

The closure 1 is sealingly fixable on the opening edge of a container. Here, the annular flange 5 rests on the upper edge of the container opening and is at the top of e.g. a screw ring overlapped. The screw ring is screwed with an internal thread on an external thread of the container. As a result, the annular flange 5 is pressed sealingly on the upper edge of the container.

In the closed position, the mouthpiece 3 is maximally inserted into the mouthpiece holder 2. According to Fig. 1e the sealing projection 22 sealingly abuts against the passage opening 7. The conical sealing projection 21 abuts sealingly against the insertion bevel 8 at the top.

Further, the inner sealing projection 19 sealingly abuts the upper end of the pin 12 and the lower end of the further through hole 17 sealingly abuts the lower pin portion 13.

In this state, liquid can not escape through the shutter 1.

To open the closure 1, the mouthpiece 3 is pulled up until the ribs 24 abut with their stop surfaces 26 at the bottom of the sleeve-shaped portion 6. This is in Fig. 2 shown. Liquid from a container onto which the closure 1 is screwed can pass through the recesses 10 between the three webs 9 to the lower end of the mouthpiece 3. The liquid can flow out between the mouthpiece 3 and the pin 12 along the other free spaces 16 on the pin 12 to the outside and exit through the upper opening portion 18 of the mouthpiece 3. Both sealing projections 22, 23 seal in the through hole 7.

Fig. 3 shows the mouthpiece 3 in an intermediate position between the closed position and the open position in which it can only be partially pulled out of the mouthpiece holder 2. This position is a cleaning position in which liquid can enter the gap between mouthpiece holder 2 and mouthpiece 3, both from above and from below, in order to clean this area. The passage of liquid is prevented only by the upper sealing projection 22.

For a complete cleaning, the shutter 1 can be easily dismantled. For this purpose, the mouthpiece 3 in the open position of Fig. 2 brought. Then mouthpiece 3 and mouthpiece holder 2 are rotated against each other, so that the webs 9 bend adjacent ribs 24 in adjacent spaces 25. At the same time mouthpiece 3 and mouthpiece holder 2 are pulled apart. As a result, the ribs 24 are bent in a helical motion and pulled into the through hole 7. When all the ribs 24 have entered the through hole 7, the mouthpiece 3 can be easily pulled out of the mouthpiece holder 2. The separated parts can be a thorough Purified and reassembled in the manner described above.

Fig. 4 shows that with five identical closures 1, the pull-out force for extracting the mouthpiece 3 from the mouthpiece holder 2 always exceeds a minimum value of 65 Newton. Even if the closures were disassembled twenty times and reassembled, this minimum value was met.

Claims (15)

1. Push-pull closure for a drink container, comprising:

   • a mouthpiece holder (2), which has a through-opening (7) and means for holding (5), by way of which it can be sealingly and detachably fastened on the edge of an opening of the drink container,

   • a pin (12), which projects into the through-opening (7) of the mouthpiece holder (2), wherein a circumferential gap exists between the pin (12) and the through-opening (7) of the mouthpiece holder,

   • several bars (9), parallel to the pin (12) and arranged around the pin (12), which are connected to the mouthpiece holder (2) at the top and to the pin (12) at the bottom,

   • a mouthpiece (3) with a further through-opening (17) for a beverage, which can be inserted into the circumferential gap so as to be axially displaceable and sealing with respect to the mouthpiece (7) on the outer circumference and accommodating the pin (12) in the further through-opening (17),

   • at least one circumferential seal element (13) between the pin (12) and the further through-opening (17), which blocks the passage of liquid through the further through-opening (17) in a closing position of the mouthpiece (3) in the mouthpiece holder (2), and unblocks the passage of liquid through the further through-opening (17) in an opening position of the mouthpiece (3) in the mouthpiece holder (2),
   characterized in that

   • several ribs (24) of a soft elastic material are provided, axially extending on the circumference of the mouthpiece (3) at the bottom, between which there are axially extending free spaces (25), wherein the mouthpiece (3) may be inserted into the mouthpiece holder (2), so that the bars (9) engage into the free spaces (25) and the ribs (24) engage into recesses (10) between the bars (9), stopping surfaces (26) present at the top edge of the ribs (24) bear against the bottom side of the mouthpiece (3) in an upper position of the mouthpiece (3), and the bars (9) bend over neighbouring ribs (24) into the free spaces (25) when the mouthpiece (3) is rotated with respect to the mouthpiece holder (2), and the mouthpiece (3) may be pulled out from the through-opening (7) under reduced extraction force.
2. Push-pull closure according to claim 1, wherein the mouthpiece holder (2) has a sleeve-shaped portion (6) through which the through-opening (7) extends.
3. Push-pull closure according to claim 1 or 2, wherein the pin (12) has an enlarged lower pin portion (13) with increased diameter at its bottom, and/or the mouthpiece (3) has an upper opening portion (18) of the further through-opening (17) with reduced diameter at the top, and in the closing position, the mouthpiece (3) bears sealingly against the lower pin portion (13) with a lower opening portion of the further through-opening (17) and/or the pin (12) bears sealingly against the upper opening portion (18) of the further through-opening (17) with an upper pin portion (14).
4. Push-pull closure according to any one of claims 1 to 3, wherein the pin (12) has further axially extending ribs (15) of a soft elastic material at the outside, between which there are further axially extending free spaces (16).
5. Push-pull closure according to any one of claims 1 to 4, wherein the cross section of the pin (12) gradually enlarges from top to bottom.
6. Push-pull closure according to any one of claims 1 to 5, wherein the pin (12) projects upward from a disc (11) and wherein the bars (9) are connected to the circumference of the disc (11).
7. Push-pull closure according to any one of claims 1 to 6, wherein the mouthpiece (3) has a bead (20) on the upper end at the outside, and/or at least one circumferential sealing shoulder (22, 23) on the outer circumference between the upper and the lower end, which bears against the through-opening (7) when the mouthpiece (3) is inserted into the through-opening (7).
8. Push-pull closure according to any one of claims 1 to 7, wherein the through-opening (7) has an upper lead-in chamfer (8) at the upper end, and/or wherein the ribs (24) have a height which decreases towards their lower end.
9. Push-pull closure according to any one of claims 1 to 8, wherein the height of the ribs (24) is at least as great as their width.
10. Push-pull closure according to any one of claims 1 to 9, wherein the number of the ribs (24) is a whole-number multiple of the number of the bars (9).
11. Push-pull closure according to any one of claims 1 to 10, which has 9 to 18, preferably 12 ribs (24) and/or 3 to 6 bars (9).
12. Push-pull closure according to any one of claims 1 to 11, wherein the ribs (24) have bevels (27, 28) on the two outer long side edges, and/or the bars have bevels (27, 28) on the two inner long side edges.
13. Push-pull closure according to claim 12, wherein the distance of the bevels (27, 28) of the ribs (24) decreases from the base of the ribs (24) towards the lower end of the ribs (24).
14. Push-pull closure according to claim 12 or 13, wherein the ribs (24) have a further lead-in chamfer (29) directed vertically to the centre axis of the through-opening (7) at their lower end.
15. Push-pull closure according to any one of claims 1 to 14, wherein the mouthpiece (3) and/or the mouthpiece holder (2) consist of a soft elastic material, preferably of silicone or a thermoplastic elastomer.

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