EP3653527B1 - Bottle closure for axial placing on a bottle and a bottle - Google Patents

Description

I. Field of application

The present invention relates to a bottle cap for axially slipping onto a mouth area of a bottle and to a bottle with a mouth area for axially slipping a bottle cap. The bottle cap and the bottle are used in particular in connection with non-alcoholic or alcoholic beverages such as wine.

II. Technical background

It is known, in particular, to fill beverage bottles with the respective beverage in automated bottling plants. If the bottles are to be closed with a screw cap, it is necessary to provide a screw head in the bottling plant which screws the screw cap onto the mouth area of the bottle after the respective bottle has been filled. For this purpose, a rotary drive is to be provided, which can apply a rotary movement to the screw head. The need to provide a rotary-driven screw head makes the filling system complex and therefore comparatively expensive.

WO 2018/055429 A1 discloses a bottle closure according to the preamble of claim 1 and a bottle according to the preamble of claim 2.

III. Presentation of the invention a) Technical task

It is therefore the object of the present invention to create a bottle cap and a bottle that make a rotary-driven screw head in the bottling plant unnecessary and at the same time ensure that a user of the bottle has the sensation of a screw cap when opening and closing the bottle.

b) Solution of the task

This object is achieved with a bottle closure having the features of claim 1 and with a bottle having the features of claim 2 . Further refinements of the present invention result from the dependent claims.

During the axial fitting of the bottle cap onto the mouth area of the bottle, the catch means on the closure side and the counter catch means on the bottle side can be exactly aligned with one another in the push-on direction. In this case, the catching means and the counter-catching means catch each other without a rotational movement of the bottle closure taking place relative to the mouth area of the bottle. However, a relative position between the catch means and the counter catch means that is exactly aligned in the direction of insertion should only rarely occur, since when the bottle closure is axially pushed onto the finish area of the bottle in the bottling plant, the relative rotational position between the bottle closure and the finish area should not be taken into account.

In most cases, such a relative rotational position between the bottle closure and the mouth area of the bottle will occur in the bottling plant, in which the catch means are not exactly aligned with the counter catch means in the push-on direction. In this case, the catching means and the counter-catching means work together according to the invention in such a way that they only change over after a limited rotary movement of the bottle closure relative to the mouth area engage a certain closing angle of rotation. The catching means and the counter-catching means work together in the sense of forced guidance, so that the limited rotational movement when the bottle cap is pushed onto the mouth area around the closing angle of rotation is generated forcibly. This limited rotational movement is tolerable within the bottling plant in which, when the bottle is first closed, a closure head pushes the bottle closure onto the mouth area of the bottle in the push-on direction. For this purpose, the bolt head only has to be mounted in such a way that it can rotate passively within the scope of the limited rotary movement. The forcibly guided, limited rotational movement of the bottle cap is then effected by its axial movement in the direction of attachment.

According to the invention, at least that partial area of the inner wall of the side area of the bottle cap can be expanded elastically, in which the catch means are arranged. However, it is also conceivable that the wall forming the side area of the bottle cap is designed to be elastically expandable overall, so that the elastic widening of the side area that occurs temporarily when the bottle cap is pushed onto the mouth area can be seen or ascertained in a side view of the bottle cap. This is not the case if an elastic material is chosen only for the inner wall of the side area.

The present invention makes it possible in an advantageous manner that no actively rotary-driven screw head has to be provided in the bottling plant. At the same time, when opening and closing the bottle, the user will always find that a limited rotational movement of the bottle cap relative to the mouth area is always required for opening and almost always for closing.

The opening rotation angle through which the bottle cap must be rotated when opening the bottle is always the same and depends on the geometric design of the catching means and the counter-catching means. The closing angle of rotation by which the bottle cap is twisted when the bottle is closed is not always the same and depends not only on the geometry of the catching means and the counter-catching means, but also on the relative rotational position of the bottle closure is placed with its catch means on the muzzle area with its counter catch means. Ultimately, the closing angle of rotation is always smaller than the opening angle of rotation, since when the bottle cap is placed on the mouth area, the catching means usually do not hit the counter-catching means in such a relative rotational position that they cause the rotary movement limited according to the invention within the scope of the constant opening angle of rotation. If the catch means are exactly aligned with the counter catch means in the direction of attachment, then there is no closing rotation movement at all and the closing rotation angle is accordingly 0°.

As a result, the present invention has the effect that the expense of a rotary-driven screw head in the bottling plant is avoided, that the user of the bottle always has to rotate the bottle cap to the extent of a constant opening angle of rotation when opening the bottle cap and that the user of the bottle has to rotate when closing the bottle cap of the bottle cap is required within the scope of a closing angle of rotation that is smaller than the opening angle of rotation.

The catching means and the counter-catching means preferably correspond to one another geometrically in terms of a shape and counter-shape. The catching or counter-catching means designed as a projection then fills out essentially completely when it engages in the counter-catching or counter-catching means designed as a depression. However, it is also conceivable that the catching means and the counter-catching means do not correspond to one another geometrically, but merely catch one another within the meaning of the present invention and can slide relative to one another during the rotary movement between the bottle closure and the mouth area. This does not require a geometric correspondence between the shapes of the catch means and the counter catch means.

The catching means on the closure side can be designed as catching depressions which are made in the inner wall of the side area. In this case, the counter-catching means on the bottle side are designed as catching projections which protrude in a raised manner from an outer wall of the mouth area of the bottle. In this configuration, the catching projections in the radial direction have the furthest protruding from the estuary peaks on a summit circle with a specified outside diameter. The inner wall of the side portion has a predetermined inner diameter. The outside diameter of the summit circle is larger than the inside diameter of the side area. In this way it is achieved that the peaks on the bottle side elastically press open or widen the inner wall of the side area before they are caught by the catch depressions on the closure side due to the elastic restoring force or engage in them.

Alternatively, it is conceivable to design the catching means on the closure side as catching projections which protrude from the inner wall of the side area. The counter-catching means on the bottle side are then designed as catching depressions which are made in an outer wall of the mouth area of the bottle. In this case, the catch projections have crests that protrude furthest inward from the inner wall in the radial direction and lie on a crest circle with an inner diameter. This inner diameter is smaller than the outer diameter of the outer wall of the mouth area in which the catching indentations are formed. The effect of this is that the catch projections on the closure side are supported on the outer wall when the bottle closure is placed on the mouth area and thereby widen or press open the inner wall of the side area before the catch projections are caught by the catch depressions or engage in them.

Irrespective of whether the catch projections are arranged on the bottle side on the mouth area or on the closure side on the side area, they can protrude to different extents from the outer wall of the mouth area or to different distances from the inner wall of the side area. This creates summit circles with different diameters.

In the case of bottle-side catch projections, the diameter of the summit circle that runs through the summit point or those summit points that is furthest from the outer wall is used for the aforementioned geometric condition that the outer diameter of the summit circle is larger than the inner diameter of the side area of the muzzle area stands out or stand out.

In the case of catching projections on the closure side, the diameter of the summit circle that runs through the summit point or those summit points that extends furthest is used as the inner diameter for the aforementioned geometric condition that the inside diameter of the summit circle is smaller than the outside diameter of the outer wall of the mouth area protrudes from the inner wall of the side portion.

Catching projections that protrude less far in certain peripheral sections of the outer wall of the mouth area or in certain peripheral sections of the side area can be advantageous for manufacturing reasons, in particular when the bottle or the bottle cap is produced using molds. With catching projections that protrude to different extents and thus engage into the catching depressions at different depths, the magnitude of the initial opening force that a user of the bottle must initially apply in order to twist the bottle cap off the mouth area can also be influenced.

The limited rotational movement preferably extends over an opening angle of rotation of 5° to 30°, more preferably over an opening angle of rotation of 10° to 20°.

The catch means are advantageously arranged and spaced within a peripheral band of the inner wall on the closure side in such a way that every imaginary cylinder-generating straight line running on the inner wall in the attachment direction runs through or intersects at least one of the catch means. In this way, it can be ensured that the catching means and the counter-catching means can at least partially engage with one another in any desired rotational position of the bottle closure relative to the mouth area. When the bottle cap is attached to the mouth area, no counter-catching means can pass through the catching means without coming into contact with the latter.

The peripheral band with the catch means arranged in it preferably runs in a half of the side area facing away from the closing area of the bottle cap. It is advantageous if the peripheral band has a width which is 30% or less of the height of the side portion of the bottle cap. The width of the peripheral band corresponds to the extent of the catch means in the push-on direction.

The catch means, which are preferably formed by a large number of catch elements, are arranged at equal distances from one another inside the peripheral band on the closure side. The individual catch elements accordingly have the same spacing from one another in the circumferential direction. The counter-catching means within a bottle-side peripheral band of the outer wall of the mouth area can be arranged and spaced apart in such a way that one or more sections of the peripheral band remain free of counter-catching means. In this way it can be determined how many catches and counter catches engage with one another. This in turn influences in particular the size of the initial opening force that a user of the bottle must initially apply in order to twist the bottle cap off the mouth area.

The catch means and/or the counter catch means have an elongate geometry. Preferably, it is a non-curved, elongate geometry with a straight longitudinal axis. Advantageously, the straight longitudinal axis forms an angle of 30° to 60°, in particular an angle of 40° to 50°, with the attachment direction. The angle can be the same for all existing catches and/or counter catches. However, it is also conceivable to arrange catches and/or counter catches at different angles to the push-on direction and in this way to influence the initial opening force that a user of the bottle must initially apply in order to twist the bottle cap off the mouth area.

The catch depressions each have a first end facing the closing area and a second end facing away from the closing area.

At least the second end is closed in such a way that the catch recesses and the catch projections engage in one another in a form-fitting manner. Thereby they hold the bottle cap on the mouth area of the bottle.

The catch depressions each have a first end facing the mouth opening and a second end facing away from the mouth opening.

At least the first end is closed in such a way that the catch recesses and the catch projections engage in one another in a form-fitting manner. Thereby they hold the bottle cap at the mouth area.

Depending on whether the catch depressions are arranged on the closure side or on the bottle side, they can each have a depression end side wall in the area of their second end or in the area of their first end, which at least in sections has a constant or changing inclination relative to the inner wall or to the outer wall runs so that it can slide along a geometrically corresponding projection end side wall of the catch projections. The associated wedging action between the recessed end side wall and the projected end side wall facilitates a temporary, at least partial, radially outward expansion of the inner wall or side region when the bottle cap is released from the mouth region.

In an embodiment which is not part of the invention, the catch depressions each have a first end facing the closing area and a second end facing away from the closing area,
at least the second end being open. This second end lies in a plane which is spanned by an edge of the side area which faces away from the closing area and on which a tear-off ring can be located when the bottle cap is first fitted onto the mouth area in the bottling plant. The effect of this is that the catch projections cannot positively hold the bottle cap on the mouth area when it engages in the catch depressions. For this purpose, separate latching means are therefore present on the bottle cap for the form-fitting latching of the bottle cap on the mouth area. In the context of the present invention, the catching depressions and catching projections that work together cause only the radial expansion of the inner wall or the side area in this variant as well as the limited rotational movement of the bottle cap during its opening process by the opening rotation angle.

In the event that elongate catching indentations are provided in the mouth area of the bottle, for example along a raised annular bead formed on it, in one embodiment which is not part of the invention, the catching indentations can have a first end facing the mouth opening and a first end away from the mouth opening have a remote second end, wherein at least the first end is open. As a result, the catch projections on the closure side cannot hold the bottle closure in a form-fitting manner on the mouth area when it engages in the catch depressions. For this purpose, separate counter-locking means for positive locking of the bottle cap on the mouth area are therefore present at the mouth area of the bottle. The catching recesses and catching projections working together in the sense of the present invention cause only the radial widening of the inner wall or the side area as well as the limited rotary movement of the bottle cap during its opening process by the opening angle of rotation.

In one embodiment, which is not part of the invention, catching depressions of any shape are provided in the bottle cap and thus catching projections of any shape are provided on the mouth area of the bottle, with the side area of the bottle cap having a tear-off ring with protruding locking elements at its end remote from the closing area of the tear-off ring may have at the mouth area.

These latching elements are designed in such a way that when the bottle cap is first placed on the finish area, they are caught in the spaces between the catch projections on the bottle side and cause the bottle cap to rotate relative to the finish area in such a way that the catch depressions on the closure side exactly match those on the bottle side in the push-on direction Catch projections are aligned before the catch depressions and the catch projections engage with each other. When the bottle cap is first attached to the mouth area, which takes place in the bottling plant, the tear-off ring with its protruding locking elements thus causes a rotary movement of the bottle cap, which precedes the locking of the catching depressions and catching projections, which are aligned with one another after the end of the aforementioned rotary movement.

The radially inwardly protruding latching elements on the tear-off ring consequently have a dual function. The first function is to cause the bottle cap to rotate relative to the finish in such a way that the catching indentations are exactly aligned with the catching projections. The second function consists in locking the bottle cap in a form-fitting manner on the mouth area of the bottle and thereby holding it.

c) exemplary embodiments

Fig. 1:

eine Seitenansicht auf ein erstes Ausführungsbeispiel eines erfindungsgemäßen Flaschenverschlusses;

Fig. 2:

eine perspektivische Ansicht auf bzw. in den Flaschenverschluss gemäß Fig. 1 von schräg unten;

Fig. 3:

eine Schnittansicht gemäß Schnitt B-B in Fig. 1;

Fig. 4:

das in Fig. 3 gekennzeichnete Detail A in vergrößerter Darstellung;

Fig. 5:

eine Schnittansicht gemäß Schnitt C-C in Fig. 4, wobei der gekrümmte Verlauf des Seitenbereichs des Flaschenverschlusses gedanklich in eine Ebene abgewickelt wurde;

Fig. 6:

eine perspektivische Ansicht des oberen Teils eines Ausführungsbeispiels einer erfindungsgemäßen Flasche;

Fig. 7:

das in Fig. 6 gekennzeichnete Detail B in vergrößerter Darstellung;

Fig. 8:

das in Fig. 6 gekennzeichnete Detail C in vergrößerter Darstellung;

Fig. 9:

eine Seitenansicht des in Fig. 6 gezeigten Ausführungsbeispiels von links vorne;

Fig. 10:

eine Seitenansicht des in Fig. 9 gezeigten Teils der Flasche von rechts;

Fig. 11a-11e:

verschiedene Axialstellungen des ersten Ausführungsbeispiels des Flaschenverschlusses relativ zu dem Mündungsbereich der Flasche beim Aufstecken des Flaschenverschlusses auf den Mündungsbereich in der Art einer Schnittdarstellung;

Fig. 12a1 und 12a2 - Fig. 12e:

verschiedene Axial- und Drehstellungen des ersten Ausführungsbeispiels des Flaschenverschlusses relativ zu dem Mündungsbereich der Flasche beim Aufstecken des Flaschenverschlusses auf den Mündungsbereich in der Art einer Seitenansicht, wobei die Buchstaben a-e Zeichnungen von Stellungen des Flaschenverschlusses kennzeichnen, die den Stellungen gemäß der Fig. 11a-11e mit jeweils korrespondierender Buchstabenkennzeichnung entsprechen;

Fig. 13a-13c:

verschiedene Axialstellungen eines zweiten Ausführungsbeispiels des Flaschenverschlusses relativ zu dem Mündungsbereich der Flasche beim Aufstecken des Flaschenverschlusses auf den Mündungsbereich in der Art einer Schnittdarstellung;

Fig. 14a-14c:

verschiedene Axialstellungen des zweiten Ausführungsbeispiels des Flaschenverschlusses relativ zu dem Mündungsbereich der Flasche beim Aufstecken des Flaschenverschlusses auf den Mündungsbereich in der Art einer Seitenansicht, wobei die verschlussseitigen Fangvertiefungen und die flaschenseitigen Fangvorsprünge gezeigt sind und bereits beim anfänglichen Aufsetzen des Flaschenverschlusses auf den Mündungsbereich in Aufsteckrichtung zueinander fluchten, und wobei die Buchstaben a-c Zeichnungen von Stellungen des Flaschenverschlusses kennzeichnen, die den Stellungen gemäß der Fig. 13a-13c mit jeweils korrespondierender Buchstabenkennzeichnung entsprechen;

Fig. 15a-15e:

verschiedene Axialstellungen des zweiten Ausführungsbeispiels des Flaschenverschlusses relativ zu dem Mündungsbereich der Flasche beim Aufstecken des Flaschenverschlusses auf den Mündungsbereich in der Art einer Schnittdarstellung; und

Fig. 16a-16e:

verschiedene Axial- und Drehstellungen des zweiten Ausführungsbeispiels des Flaschenverschlusses relativ zu dem Mündungsbereich der Flasche beim Aufstecken des Flaschenverschlusses auf den Mündungsbereich in der Art einer Seitenansicht, wobei die verschlussseitigen Fangvertiefungen und die flaschenseitigen Fangvorsprünge beim anfänglichen Aufsetzen des Flaschenverschlusses auf den Mündungsbereich nicht in Aufsteckrichtung zueinander fluchten, und wobei die Buchstaben a-e Zeichnungen von Stellungen des Flaschenverschlusses kennzeichnen, die den Stellungen gemäß der Fig. 15a-15e mit jeweils korrespondierender Buchstabenkennzeichnung entsprechen.

Exemplary embodiments of the present invention are described below by way of example with reference to the accompanying drawings. Show it:

Figure 1:

a side view of a first embodiment of a bottle closure according to the invention;

Figure 2:

a perspective view of or into the bottle cap according to FIG 1 from diagonally below;

Figure 3:

a sectional view according to section BB in 1 ;

Figure 4:

this in 3 Marked detail A in an enlarged view;

Figure 5:

a sectional view according to section CC in 4 , wherein the curved course of the side area of the bottle cap has been developed into one plane;

Figure 6:

a perspective view of the upper part of an embodiment of a bottle according to the invention;

Figure 7:

this in 6 Marked detail B in an enlarged view;

Figure 8:

this in 6 Marked detail C in an enlarged view;

Figure 9:

a side view of the in 6 shown embodiment from the front left;

Figure 10:

a side view of the in 9 shown part of the bottle from the right;

Figures 11a-11e:

different axial positions of the first exemplary embodiment of the bottle cap relative to the mouth area of the bottle when the bottle cap is pushed onto the mouth area, in the form of a sectional representation;

Fig. 12a1 and 12a2 - Fig. 12e:

various axial and rotational positions of the first embodiment of the bottle cap relative to the neck area of the bottle when fitting the bottle cap onto the neck area in the manner of a side view, the letters ae denoting drawings of positions of the bottle cap corresponding to the positions according to Figures 11a-11e with the corresponding letter designation;

Figures 13a-13c:

different axial positions of a second exemplary embodiment of the bottle cap relative to the mouth area of the bottle when the bottle cap is pushed onto the mouth area, in the form of a sectional view;

Figures 14a-14c:

different axial positions of the second exemplary embodiment of the bottle cap relative to the mouth area of the bottle when the bottle cap is placed on the mouth area in the manner of a side view, with the cap-side catch recesses and the bottle-side catch projections being shown and already aligned with one another in the push-on direction when the bottle cap is initially placed on the mouth area , and where the letters ac denote drawings of positions of the bottle cap corresponding to the positions according to Figures 13a-13c with the corresponding letter designation;

Figures 15a-15e:

different axial positions of the second exemplary embodiment of the bottle cap relative to the mouth area of the bottle when the bottle cap is pushed onto the mouth area, in the form of a sectional view; and

Figures 16a-16e:

different axial and rotational positions of the second exemplary embodiment of the bottle cap relative to the mouth area of the bottle when the bottle cap is placed on the mouth area in the manner of a side view, the catch depressions on the cap side and the catch projections on the bottle side not being aligned with one another in the push-on direction when the bottle cap is initially placed on the mouth area , and where the letters ae denote drawings of positions of the bottle cap corresponding to the positions according to Figures 15a-15e with the corresponding letter designation.

1 shows a side view of a first exemplary embodiment of a bottle closure 1 according to the invention Closing a mouth opening of a bottle. at his in 1 At the lower end, the bottle cap 1 has a so-called tear-off ring 13, which detaches from the side area 4 in a predetermined breaking plane 19 when the bottle cap 1 is opened for the first time and remains attached to the mouth area of the bottle. The tear-off ring 13 and the predetermined breaking plane 19 thus form originality features of the bottle cap 1 which are known per se and which can be used to identify whether the bottle cap 1 has already been opened for the first time. On the second and each subsequent opening of the bottle closure 1, only the side area 4 and the closing area 5, which form a one-piece plastic unit in the exemplary embodiment shown, are removed from the mouth area of the bottle.

In 2 is a perspective view of FIG 1 shown bottle cap 1 shown obliquely from below. In an inner wall 7 of the side area 4 is a plurality - in the embodiment shown a total of 24 pieces - formed of elongate, rectilinearly extending catch recesses 8, which act as catch means. Depending on requirements, more or fewer than 24 catch recesses 8 can be provided. The tear-off ring 13 has latching elements 14 protruding radially inwards on its inner circumference.

3 shows the sectional view according to section BB in 1 and 4 shows that in 3 Marked detail A in an enlarged view. In the embodiment shown, the side area 4 has a 3 upper, slightly frustoconical section and an in 3 lower, cylindrical section. The inner wall 7 of the side area 4 that is relevant here is the inner wall 7 of its lower cylindrical section.

It can be seen that the catch depressions 8 are arranged in an imaginary circumferential band VUB on the closure side, which runs closed on the inner wall 7 of the side area 4, ie over an angular extent of 360°. The catch depressions 8 are arranged in this circumferential band VUB at equal intervals. The latching elements 14 of the tear-off ring 13 are also arranged at equal intervals around its inner circumference by 360°.

The inner wall 7 of the lower, cylindrical section of the side area 4 has an inner diameter D _i . Accordingly, the low points of two diametrically opposite catch depressions 8 are at a distance from one another that is greater than this inner diameter D _i . As in 3 As can be seen, the peripheral band VUB with the catch depressions 8 is in the lower half of the side area 4 which faces away from the closing area 5 . The width B of the peripheral band VUB characterizes the extent by which the catch indentations 8 in 3 shown attachment direction AR, in which the bottle cap 1 is attached to the mouth area of a bottle. In the embodiment shown, the width B is approximately 22% of the total height H of the side area 4 of the bottle cap 1. The width B of the peripheral band VUB should preferably be equal to or less than 30% of the total height H of the side area 4.

As in 4 As can be seen, each of the catch depressions 8 has a longitudinal axis 10 . In the exemplary embodiment shown, the angle α between the longitudinal axis 10 of each catch recess 8 and the attachment direction AR is 45°. The angle α is preferably in the range from 30° to 60°, even more preferably in the range from 40° to 50°.

figure 5 shows the in 4 marked section CC along the longitudinal axis 10 of a catch depression 8. The in 4 The enlarged part of the peripheral band VUB is conceptually developed in one plane, so that the course of the catch recess 8, which is slightly curved in the direction of the longitudinal axis 10, in figure 5 been neglected. The oblong geometry of the catch recess 8 molded into the inner wall 7 can be seen. It has a first end 11 in the Figures 3 to 5 forms the upper end of the catching recess 8 and faces the closing portion 5 . The catch recess 8 also has a second end 12 in the Figures 3 to 5 forms the lower end of the catch depression 8 and faces away from the closing area 5, ie at the same time faces the lower edge 16 of the side area 4. In particular in the area of its second end 12, the catch recess 8 has a figure 5 characterized indentation end side wall 18, which has an inclination β to the plane of the imaginary inner wall 7 developed within the scope of the present invention. je larger the angle of inclination β is chosen, the larger will be the forces required to release the bottle cap 1 from the mouth area.

6 shows the upper part of an exemplary embodiment of a bottle 3 according to the invention. To close the mouth opening 6, the bottle cap 1 is pushed onto the mouth area 2 in the push-on direction AR. When the bottle cap is fully attached, its closing area 5 closes the mouth opening 6 and its side area 4 encompasses the mouth area 2 of the bottle 3.

In the Figures 7 and 8 the details B and C are off 6 shown enlarged. It can be seen that the mouth region 2 comprises an upper, slightly frustoconical section facing the mouth opening 6, a lower cylindrical section facing away from the mouth opening 6 and a closed circumferential tear-off ring retaining bead 21. The cylindrical, lower section of the mouth area 2 forms an outer wall 17 of the mouth area 2, which is relevant here.

As can be seen, the cylindrical outer wall 17 is formed almost entirely by an imaginary, bottle-side peripheral band FUB, in which a large number - in the illustrated embodiment a total of 18 pieces - of catch projections 9 protrude from the outer wall 17, which act as counter-catching means. Depending on requirements, more or fewer than 18 catch projections 9 can be provided. Each of the elongate catching projections 9 extending in a straight line can thus in each case essentially completely fill out an associated catching depression 8 . This geometric correspondence of the geometries of the catching projections 9 and the catching depressions 8 in the embodiment shown is not mandatory. There are also different geometries for the catching projections 9 and the catching depressions 8 on the other hand conceivable within the scope of the present invention, for example an elongate catching depression as shown in combination with a catching projection consisting of two or more point or pin-like elevations, which are arranged in a straight line in a row.

In 7 it can also be seen that the bottle-side peripheral band FUB is not completely covered with elongate catch projections 9 . In the exemplary embodiment shown, the peripheral band FUB or the outer wall 17, which is somewhat wider in the attachment direction AR, has two diametrically opposite peripheral sections (only one in 7 visible), in which no catch projections 9 are present. In this way, the number of engagement pairs of catching projections 9 and catching depressions 8 and thus the opening force required to remove the bottle closure 1 from the mouth area 2 can be influenced. In principle, however, it is also conceivable for there to be as many evenly spaced catch projections 9 on the bottle side as there are catch depressions 8 in the inner wall 7 of the bottle closure 1.

As best in 8 As can be seen, each catch projection 9 has a summit line consisting of a plurality of summit points 22, which is characterized in that it is formed by summit points 22 that protrude furthest from the outer wall 17 in the radial direction.

the Figures 9 and 10 show different side views of the in 6 shown, upper part of the bottle 3. The viewing direction of the 9 is directly on the free of catch projections 9 and in 6 visible peripheral section of the bottle-side peripheral band FUB directed. The direction of the 10 is rotated by 90°, ie it is looking at the in from the right 9 shown bottle 3. The peaks 22 of all catch projections 9 are in the embodiment shown on an outer diameter D _a , the 9 is marked. This outer diameter D _a of the peaks 22 of the catching projections 9 is larger than the inner diameter D _i of the inner wall 7 of the side area 4 of the bottle closure 1. Due to this diameter ratio D _a /D _i > 1, the bottle-side catching projections 9 can catch the inner wall 7 or the side area 4 of the Expand the bottle cap 1 elastically when it is attached to the mouth area 2 . The elastic widening of the inner wall 7 or of the side area 4 only decreases again when the catching projections 9 engage completely in the catching depressions 8 . It is advantageous if the elastic expansion does not go back completely, but the catch depressions 8 are still pressed radially inward against the catch projections 9 with a certain residual restoring force. This prevents the bottle cap 1 from being seated loosely and with play on the mouth area 2 .

As in 8 As can be seen, the catching projections 9 have a projection end side wall 23 at their lower end facing away from the mouth opening 6, the inclination of which to the imaginary outer wall 17 being developed is the same as that in FIG figure 5 marked inclination angle β of the depression end side wall 18 relative to the unwound imaginary inner wall 7. When detaching the bottle cap 1 from the mouth area 2, the respective depression end side wall 18 can slide off the respective projection end side wall 23, so that the inner wall 7 or the side area 4 is elastically widened again. The wedge effect created between the depression end side wall 18 and the projection end side wall 23 thus supports the user of the bottle 3 when opening the bottle closure 1.

Alternatively, but not according to the invention, it is conceivable to design the catch depressions 8 open at their respective second end 12 . This means that in figure 5 the well end side wall 18 is not present at all and the wedging effect discussed above does not occur. The respective catch projection 9 can then not be held positively in the catch depression 8 by the second end 12 . Instead, only static friction forces, which hold the catching projection 9 in the catching depression 8 by friction, act between the elongated, abutting flanks of the catching projection 9 and the catching depression 8 . These static friction forces can be sufficient to securely hold the catch projection 9 in the catch depression 8 . However, if they are overcome, the catch projection 9 in figure 5 slide down and out of the catch depression 8 to the right. For this reason, in this variant, additional locking means can be provided on the side area 4 if necessary for the positive locking of the bottle cap 1 on the mouth area 2 .

In 10 the longitudinal axis 10 of a catch projection 9 is marked. The angle α between the attachment direction AR and the longitudinal axis 10 is 8 in the exemplary embodiment shown, as is the case with the catch recesses 8 on the closure side 45°. The bottle-side angle α becomes identical to the cap-side angle α according to FIG 4 chosen and is preferably 30 ° to 60 °, particularly preferably 40 ° to 50 °.

In 8 Interstices 15 located between the catch projections 9 are marked. The latching elements 14 present on the tear-off ring 13 of the bottle cap 1 are dimensioned in such a way that they can slide along the gaps 15 . This means that the latching elements 14 can perform a dual function. On the one hand, they hold the tear-off ring 13 in a manner known per se on the tear-off ring retaining bead 21 on the bottle side and, on the other hand, before the catch projections 9 finally engage in the catch depressions 8, they perform a guiding function according to the invention, during which the bottle cap 1 is pre-rotated and the catch depressions 8 and the catch projections 9 are aligned with one another in the insertion direction AR.

The following is based on the Figures 11a to 11e as well as the Figures 12a1, 12a2 to 12e describes how the bottle cap 1 according to the first exemplary embodiment is attached to the mouth area 2 in the direction AR and which relative movements take place between the bottle cap 1 and the mouth area 2 of the bottle 3 . For reasons of clarity, reference numbers have essentially only been used in FIGS Figures 11a and 12a2 intended. The other figures always show the same bottle cap 1 and the same mouth area 2 as those Figures 11a and 12a2 in other positions relative to one another, so that the individual elements of the bottle closure 1 and the mouth area 2 are the same in the other figures as in FIGS Figures 11a and 12a2 .

When the bottle 3 is closed for the first time after it has been filled in the bottling plant, the bottle closure 1 is adjusted accordingly Figure 11a automatically placed by a suitable handling unit in the bottling plant in the insertion direction AR on the mouth area 2. In the Figures 12a1 and 12a2 two different relative rotational positions of the bottle cap 1 relative to the mouth area 2 are shown as an example, which the bottle cap 1 can assume randomly at this point in time. In Figure 12a1 are they running Latching elements 14 more or less directly into the gaps 15 between the catch projections 9 on the bottle side. In Figure 12a2 meet the locking elements 14 of the tear-off ring 13 during the movement in the insertion direction AR more or less directly on the upper ends of the bottle-side catch projections 9 12a1, 12a2 and 12b to 12d The rotary indicator DI drawn in in the form of a vertical dashed line indicates the respective relative rotary position of the bottle cap 1 relative to the mouth area 2 . In addition to the two in the Figures 12a1 and 12a2 Relative rotational positions shown can of course also occur in the bottling plant any other relative rotational positions.

In the Figures 11b and 12b the bottle cap 1 has already moved a little further down in the attachment direction AR. Based on the relative rotational position according to Figure 12a1 has it also twisted a bit according to the rotation indicator DI (in view of the Figure 12b clockwise from top). This rotation is brought about by the latching elements 14 which slide along the upper flanks of the inclined catch projections 9 . Accordingly, the latching elements 14 act like guide lugs, which are guided by the catch projections 9 in the intermediate spaces 15 . In the process, the tear-off ring 13 and, as a result, the entire bottle cap 1 is forced to rotate in a clockwise direction.

Based on the relative rotational position according to Figure 12a2 the bottle cap has 1 on its way into the in Figure 12b shown position executed exclusively a linear axial movement in the attachment direction AR, as can be seen from the rotation indicator DI. The latching elements 14 have moved over the beveled upper ends of the catch projections 9 and thus the Figure 12b position shown.

In the Figures 11c and 12c the bottle cap 1 has in turn moved a little further in the attachment direction AR. The latching elements 14 have now completely passed through the gaps 15 between the catch projections 9 and the bottle cap 1 has rotated further in the clockwise direction, as can be seen from the rotation indicator DI. It can be seen that the catching recesses 8 on the closure side and the catching projections 9 on the bottle side are now in the push-on direction AR are exactly aligned with each other. In 11c It can be seen how the catch projections 9 in the exemplary embodiment shown begin to expand the side area 4 of the bottle cap 1 elastically outwards in the radial direction RR.

In the Figures 11d and 12d the bottle cap 1 has moved a further distance down in the attachment direction AR. The rotation indicator DI shows that it has changed compared to its in Figure 12c shown position has not twisted. A purely axial movement took place in the attachment direction AR.

After a further, purely axial movement in the insertion direction AR, the bottle cap 1 finally reaches the Figures 11e and 12e shown, final closed position in which it closes the mouth opening 6 of the bottle 3. The catch projections 9 on the bottle side have caught the catch recesses 8 on the closure side and are fully engaged or snapped into the catch recesses 8, as shown in FIG Figure 11e can be seen. The elastic restoring force, which acts against the in 11c shown radial direction RR strives to press the side area 4 of the bottle cap 1 against the mouth area 2 of the bottle. This elastic restoring force results from the intrinsic elasticity of the material from which the bottle cap 1 is made. In this context, for example, plastics or metals such as aluminum are suitable. In Figure 12e the catch depressions 8 and the catch projections 9 are thus congruent on top of each other and can no longer be distinguished from one another in the graphic representation.

In the final closed position of the bottle cap 1 according to Figures 11e and 12e the latching elements 14 of the tear-off ring 13 engage behind the tear-off ring retaining bead 21 running annularly around the mouth area 2, as shown in FIG Figure 11e is shown. Furthermore, the catch projections 9 are firmly seated in the catch recesses 8.

If a user wants to open the bottle 3 for the first time, he cannot do this with a pure axial movement of the bottle cap 1 upwards counter to the push-on direction AR. The interlocking catch recesses 8 and catch projections 9, in the 3 and 9 shown diameters D _i and D _a , the in the 4 and 10 marked angle α as well as the in figure 5 The angles of inclination β are designed in such a way that the usual forces of a human user of the bottle 3 are not sufficient to open the bottle cap 1 in Figure 12e be pulled off upwards in a pure, straight-line axial movement in such a way that the in Figure 12d shown position of the bottle cap 1 would be achieved.

Rather, the user must the bottle cap 1 in supervision of the Figure 12e viewed from above in a counterclockwise direction with a slight rotary movement relative to the mouth area 2 . This slides the in figure 5 shown depression end side wall 18 of a catch depression 8 along the in 8 indicated projection end side wall 23 of the respectively associated catch projection 9. The wedge effect occurring when these walls slide against one another supports the user of the bottle in the catch recess 8 in the region of its in figure 5 second end 12 shown to be lifted off the catch projection 9 in the radial direction.

With continued rotation, the slides in figure 5 shown second end 12 of the respective catch depression 8 along the in 8 Drawn peaks 22 of the respective catch projection 9 upwards. During this sliding movement, an ever smaller, in 8 upper area of the respective catching projection 9 still enters the respective catching depression 8 since the elastic restoring force presses the side area 4 radially inwards onto the mouth area 2 . Eventually that reaches in figure 5 shown, second end 12 of the catch recess 8 in 8 upper end of the respective catching projection 9, so that the catching projection 9 has moved completely out of the catching depression 8 and accordingly there is no forced rotational guidance of the bottle cap 1 at the mouth region 2 any longer. The bottle cap 1 can then be pulled off further upwards by means of a purely axial movement counter to the push-on direction AR.

During the rotary movement of the bottle cap 1 when opening the same, the tear-off ring 13 is also pulled upwards. Since it is positively held by the locking elements 14 on the tear-off ring retaining bead 21 in the opposite direction to the insertion direction AR, it is released when the bottle cap 1 is opened for the first time due to the axial forces acting against the push-on direction in the predetermined breaking plane 19 from the lower edge 16 of the side area 4.

When the bottle cap 1 is closed and each time it is opened again, the tear-off ring 13 remains on the mouth area 2 of the bottle 3 . The bottle cap 1 is then only formed by its closing area and its side area 4 . He lost the demolition ring 13, so to speak.

As described above, the opening of the bottle cap 1 is only possible in connection with a limited rotary movement of the bottle cap 1 by a predetermined, constant opening angle of rotation. The size of the opening rotation angle is measured in the circumferential direction of the bottle-side circumferential band FUB distance of the in 8 lower end of a catch projection 9 from the in 8 upper end of the same catch projection 9 set. In the exemplary embodiment shown, the opening angle of rotation is approximately 15°. The opening angle of rotation is preferably selected in the range from 5° to 30°, more preferably in the range from 10° to 20°.

Below is the initial attachment of a second embodiment of a bottle cap 1 on the mouth area 2 of the bottle 3 in connection with the Figures 13a to 13c, 14a to 14c , 15a to 15e and 16a to 16e described.

The second exemplary embodiment of the bottle closure 1 differs from the first exemplary embodiment in that its tear-off ring 13 has no latching elements 14 that can enter the spaces 15 between the catch projections 9 on the bottle side. In the Figures 13a to 13c 15a to 15e of the second exemplary embodiment of the bottle closure 1 can be designed so wide, for example, that they simply run over the catch projections 9 on the bottle side. In contrast to the first exemplary embodiment, they therefore do not cause any forced rotary movement of the bottle cap 1 when the tear-off ring 13 with its latching elements runs over the bottle-side peripheral band FUB with its catch projections 9 .

The movement sequences described below when the bottle cap 1 is closed for the first time according to the second exemplary embodiment can also be carried out in the same way when closing the bottle cap 1 again according to the first exemplary embodiment (cf. Figure 12e , Re-closing the bottle cap 1 without tear-off ring 13) and when re-closing the bottle cap 1 according to the second embodiment (also without tear-off ring 13).

There were only in the Figures 13a and 14a references inserted. the Figures 13b, 13c and 14b, 14c show the same bottle cap 1 and the same mouth area 2 as those shown in FIG Figures 13a and 14a , only in different relative positions to each other. For reasons of clarity, therefore, no reference numerals in the Figures 13b, 13c and 14b, 14c inserted.

the Figures 13a and 14a show a relatively rare situation in which the bottle cap 1 can be placed on the mouth area 2 for the first time in the bottling plant or when the bottle 3 is closed again by a user. As in 14a As can be seen, this constellation is characterized in that the catch recesses 8 and the catch projections 9 are exactly aligned with one another in the push-on direction AR when the bottle cap 1 is initially pushed onto the mouth region 2 . In 14a accordingly, the catch depressions 8 are located exactly above the catch projections 9.

In the Figures 13b and 14b the bottle cap 1 has already moved further down in the insertion direction AR. The tear-off ring 13 ran over the catch projections 9 on the bottle side in a straight line, so that there was no relative rotary movement between the bottle cap 1 and the mouth opening 2, but only a straight axial movement of the bottle cap 1 downwards. The state of motion according to Figure 14b corresponds to that in connection with Figure 12d described state of motion.

the Figures 13c and 14c show the final closed state of the bottle cap 1, which corresponds to that in Figure 12e corresponds to the state of motion shown. He is from the in Figure 14b shown state of motion by a further, purely axial movement in the attachment direction AR. The catch projections 9 engage In this state, they completely enter the catch depressions 8 and can therefore no longer be shown in the drawing so that they can be distinguished from one another. Opening the in Figure 14c shown bottle cap 1 by removing it from the mouth area 2 takes place in the same way as described above in connection with the first exemplary embodiment of the bottle cap 1, ie initially by means of a combined axial and rotary movement, the rotary movement taking place through a relatively small opening angle of rotation .

the Figures 15a and 16a show a further constellation of an initial relative rotational position between the bottle closure 1 and the mouth area 2, which by its nature should occur much more frequently when the bottle is closed for the first time in the bottling plant or when the bottle is closed again by a user than in 14a relative rotational position shown with precisely aligned catch recesses 8 and catch projections 9. Since the Figures 15b to 15e and 16b to 16e the same bottle cap 1 and the same mouth area 2 as the Figures 15a and 16a show only in other relative positions, for reasons of clarity only in the Figures 15a and 16a Reference numbers used.

In the Figures 15a and 16a the bottle cap 1 can be seen with an initial angle of rotation offset between the cap-side peripheral band VUB with the catching depressions 8 and the bottle-side peripheral band FUB with the catching projections 9 . Based on the in the Figures 16a to 16d In the form of a broken line drawn rotation indicator DI it can be seen that the offset in terms of the angle of rotation here corresponds to approximately half the extension of the catch depressions 8 or the catch projections 9 in the circumferential direction.

In the Figures 15b and 16b 1 shows a state of movement in which the bottle cap 1 has moved downwards by means of a purely linear, axial movement in the attachment direction AR, which can be read using the rotary indicator DI. The tear-off ring 13 has run over the bottle-side peripheral band FUB with the catch projections 9 in a straight line and accordingly has not caused the bottle cap 1 to rotate. As in Figure 15b can be seen, the catch projections 9 begin to widen the side area 4 elastically in the radial direction RR.

In the Figures 15c and 16c a state of motion is shown in which the catching depressions 8 and the catching projections 9 have come closer together. The bottle cap 1 has reached this state of movement by a further linear axial movement in the insertion direction AR, as can be seen from the rotary indicator DI.

In the Figures 15d and 16d the bottle cap 1 has finally reached a state of movement in which the catch depressions 8 on the closure side and the catch projections 9 on the bottle side partially overlap one another. According to the rotation indicator DI, this state was also achieved by a purely straight-line axial movement in the attachment direction AR. Because of the elastic restoring force acting radially inward on the side area 4, the catch projections 9 snap into place in the overlapping area with the catch depressions 8 in the latter. Accordingly, the catching projections 9 partially engage in the catching depressions 8 both in the circumferential direction (relating to the longitudinal extension of the immersion of the catching projections 9 in the catching depressions 8) and in the radial direction (relating to the depth of the immersion of the catching projections 9 in the catching depressions 8).

This partial engagement results in a sliding guide of the bottle cap 1 on the mouth region 2, which forces the bottle cap 1 to rotate downwards in the push-on direction AR when the bottle cap 1 is pressed further. As the movement of the bottle cap continues, 1 in Figure 16d down the slides in figure 5 shown second end 12 of a respective catch recess 8 on the in 8 peaks 22 shown in the lower area of a respective catch projection 9 increasingly downwards. The degree of partial engagement of the catch projections 9 in the catch recesses 8 increases more and more. The aforementioned sliding movement continues until the in figure 5 shown depression end side wall 18 of a respective catch depression 8 finally at the in 8 indicated projection end side wall 23 of a respective catch projection 9 is applied and the catch projections 9 fully engage in the catch recesses 8, so that in the Figures 15e and 16e illustrated, final closed position of the bottle cap 1 is reached.

The in the Figures 15e and 16e The closed position shown corresponds to the closed positions according to FIG Figures 11e and 12e and 13c and 14c. The catch projections 9 sit completely and firmly in the catch depressions 8. A graphic distinction between the catch depressions 8 and the catch projections 9 is shown in Figure 16e therefore no longer possible.

A loosening of the in Figure 16e shown bottle cap 1 from the mouth area 2 in the same way as has already been described in connection with the first embodiment of the bottle cap 1, ie by means of a combined axial and rotary movement and a subsequent pure axial movement against the insertion direction AR. The rotary movement takes place around a relatively small opening angle of rotation.

While the opening angle of rotation is always constant depending on the geometry of the catch projections 9 (ie depending on the length of their extension in the circumferential direction). Figures 16a to 16e It is clear that the closing angle of rotation through which the bottle cap 1 must be rotated when closing the bottle 3 depends on the initial angle of rotation offset between the catch recesses 8 and the catch projections 9 (cf. 16a ). The greater the above-mentioned angle of rotation offset, the greater the closing angle of rotation. The maximum closing angle of rotation approximately reaches the constant opening angle of rotation, but is usually smaller than the opening angle of rotation due to the low probability that the initial angle of rotation offset happens to just cause the maximum closing angle of rotation.

REFERENCE LIST

1

bottle cap

2

mouth area

3

Bottle

4

Side area of the bottle closure

5

Closing area of the bottle cap

6

muzzle opening

7

inner wall of the side area

8th

catch means of the bottle cap; catch depressions

9

bottle antidote; catch projections

10

Longitudinal axis of the catch means and/or the counter catch means

11

First end of catch depression 8

12

Second end of catch recess 8

13

tear ring

14

Locking elements of the tear-off ring 13

15

Spaces between the catch projections 9

16

Edge of side panel 4

17

outer wall of the mouth area

18

well end sidewall

19

breaking point

20

bottleneck

21

tear-off ring retaining bead

22

Pinnacles of catch projections 9

23

boss end sidewall

AR

Placement direction of the bottle cap 1 onto the mouth area 2

B

Width of the peripheral band UB

Tue

Inside diameter of the side area 4

There

Outer diameter of the crest circle of the catch projections 9

TUE

rotation indicator

FUB

Circumferential band on the bottle side on the outer wall 17

H

Side panel height 4

RR

radial direction

VUB

Closure-side perimeter band on the inner wall 7

a

Angle between longitudinal axis 10 and insertion direction AR

β

Angle of inclination of the depression end side wall 18 relative to the developed imaginary inner wall 7

Claims (10)

1. Bottle cap (1) for axially fitting onto a mouth region (2) of a bottle (3) having a mouth opening (6) in a fitting direction (AR), the bottle cap (1) having a lateral region (4) for enclosing the mouth region (2) and a closing region (5) for closing the mouth opening (6),
   the lateral region (4) having an inner wall (7) with catching means (8) which are used to catch mating catching means (9) on the mouth region (2) of the bottle (3), with at least the inner wall (7) being elastically expandable in the radial direction at least partially by means of the mating catching means (9) or the catching means (8) during the fitting of the bottle cap (1) onto the mouth region (2), the catching means (8) and the mating catching means (9) interacting in such a way that the bottle cap (1) can be pulled off from the mouth region (2) counter to the fitting direction (AR) only by means of a limited rotary movement of the bottle cap (1) relative to the mouth region (2) about an opening angle of rotation, the catching means (8) and/or the mating catching means (9) having an elongate geometry, and the mating catching means being catching projections, characterised in that the catching means are catching depressions (8) and the inner wall (7) has an inner diameter (D_i), the catching projections (9) having apexes (22) that protrude furthest from the mouth region (2) in the radial direction and lie on an apex circle having an outer diameter (D_a) which is greater than the inner diameter (D_i), the catching depressions (8) each having a first end (11) facing the closing region (5) and a second end (12) facing away from the closing region (5), and at least the second end (12) being closed so that the catching depressions (8) and the catching projections (9) engage in one another in a form-fitting manner and can thus hold the bottle cap (1) on the mouth region (2).
2. Bottle (3) comprising a mouth region (2) and a mouth opening (6), with it being possible for a bottle cap (1) having a lateral region (4) for enclosing the mouth region (2) and a closing region (5) for closing the mouth opening (6) to be axially fitted onto the mouth region (2) in a fitting direction (AR),
   the mouth region (2) having an outer wall (17) with mating catching means (9) which are used to catch catching means (8) on an inner wall (7) of the lateral region (4) of the bottle cap (1), and, by means of the mating catching means (9) or the catching means (8), at least the inner wall (7) being at least partially elastically expandable during the fitting of the bottle cap (1) onto the mouth region (2), and the mating catching means (9) and the catching means (8) interacting in such a way that the bottle cap (1) can be pulled off from the mouth region (2) counter to the fitting direction (AR) only by means of a limited rotary movement of the bottle cap (1) relative to the mouth region (2) about an opening angle of rotation, the catching means (8) and/or the mating catching means (9) having an elongate geometry, the catching means being catching projections, characterized in that the mating catching means are catching depressions which are arranged in an outer wall (17) of the mouth region (2), the outer wall (17) having an outer diameter, the catching projections having apexes that protrude furthest from the inner wall (7) in the radial direction and lie on a apex circle having an inner diameter which is smaller than the outer diameter, the catching depressions each having a first end facing the mouth opening (6) and a second end facing away from the mouth opening (6), and at least the first end being closed so that the catching depressions and the catching projections engage in one another in a form-fitting manner and can thus hold the bottle cap (1) on the mouth region (2).
3. Bottle cap or bottle according to either of the preceding claims,
   characterised in that
   the opening angle of rotation is in the range of from 5° to 30°, in particular in the range of from 10° to 20°.
4. Bottle cap according to any of claims 1 or 3,
   characterised in that
   the catching means (8) are arranged and spaced within a circumferential band (VUB) of the inner wall (7) in such a way that every theoretical cylinder-generating straight line that extends on the inner wall (7) in the fitting direction (AR) passes through at least one of the catching means (8), so that the catching means (8) and the mating catching means (9) can at least partially engage with one another in any desired rotational position of the bottle cap (1) relative to the mouth region (2).
5. Bottle cap according to claim 4,
   characterised in that
   the circumferential band (VUB) extends in a half of the lateral region (4) facing away from the closing region (5).
6. Bottle cap according to either claim 4 or claim 5,
   characterised in that
   the circumferential band (VUB) has a width (B) which is 30% or less of a height (H) of the lateral region (4).
7. Method according to either claim 2 or claim 3,
   characterised in that
   the mating catching means (9) are arranged and spaced within a circumferential band (FUB) of the outer wall (17) in such a way that one or more portions of the circumferential band (FUB) remain free of mating catching means (9).
8. Bottle cap or bottle according to any of the preceding claims,
   characterised in that
   the elongate geometry has a rectilinear longitudinal axis (10).
9. Bottle cap or bottle according to any of the preceding claims,
   characterised in that
   the catching depressions (8) each have, in the region of their second end (12) or their first end, a depression-end side wall (18) which at least partly extends with a constant or changing inclination relative to the inner wall (7) or the outer wall (17) in such a way that it can slide along a geometrically corresponding projection-end side wall (23) of the catching projections (9), with the wedge effect associated therewith facilitating a temporary, at least partial widening of the inner wall (7) in the radial direction when the bottle cap (1) is detached from the mouth region (2).
10. Bottle cap according to any of claims 1, 3 to 6, 8 or 9,
    characterised in that
    the lateral region (4) has, at its end facing away from the closing region (5), a tear-off ring (13) having protruding latching elements (14) for securing the tear-off ring (13) to the mouth region (2), which are also designed in such a way that, when the bottle cap (1) is first fitted onto the mouth region (2), they are caught in gaps (15) between the catching projections (9) and cause the bottle cap (1) to rotate relative to the mouth region (2) in such a way that the catching depressions (8) are aligned with the catching projections (9) in the fitting direction (AR) before the catching depressions (8) and the catching projections (9) engage with one another.

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