EP0437526A1

EP0437526A1 - Screw top

Info

Publication number: EP0437526A1
Application number: EP89911796A
Authority: EP
Inventors: Jürgen Weiss; Hans Dieter Dubs; Hans Joachim Preuss
Original assignee: Alcoa Deutschland GmbH Verpackungswerke
Current assignee: Alcoa Deutschland GmbH Verpackungswerke
Priority date: 1988-10-05
Filing date: 1989-09-27
Publication date: 1991-07-24
Also published as: ES2029106T3; PT91908B; JPH04501246A; CA2000229A1; EP0364775B1; DE58900762D1; IL91854A0; AU4420389A; EP0364775A1; US5255805A; PT91908A; WO1990003924A1

Abstract

Un bouchon vissé pour récipients filetés, en particulier des bouteilles, des verres etc., est caractérisé par une bague filetée (11) comportant au moins une saillie (15), qui entre en prise avec le filetage (33) du récipient (31) et constitue le filetage du bouchon vissé (1). De préférence, la bague filetée (11) est conçue comme une bague de garantie, c'est-à-dire qu'elle comporte une partie inférieure (23) pourvue de barbes (27) partant d'une section horizontale de la paroi (25). Lorsque l'on ouvre le récipient (31) pour la première fois, les barbes (27) mordent en-dessous des saillies correspondantes sur le récipient et font sauter la partie inférieure (23) de la bague. Grâce aux saillies (15) dont est pourvue la bague filetée (11), il n'est pas nécessaire de fileter le capuchon (3) du bouchon vissé (1).A screw cap for threaded containers, in particular bottles, glasses etc., is characterized by a threaded ring (11) having at least one projection (15), which engages the thread (33) of the container (31). and constitutes the thread of the screw cap (1). Preferably, the threaded ring (11) is designed as a guarantee ring, i.e. it has a lower part (23) provided with barbs (27) starting from a horizontal section of the wall ( 25). When opening the container (31) for the first time, the barbs (27) bite below the corresponding protrusions on the container and pop off the lower part (23) of the ring. Thanks to the projections (15) with which the threaded ring (11) is provided, it is not necessary to thread the cap (3) of the screw cap (1).

Description

Screw cap

description

The invention relates to a screw closure for threaded containers according to the preamble of claim 1.

Screw caps of the type mentioned here are used for containers, for example bottles, jars for liquid, pasteuses or pourable goods. In their mouth area, the containers are provided with a thread, which can also consist, for example, of short thread attachments. Such threads are also referred to as twist-off threads.

The screw closures intended for such containers have a closure cap which is provided with a thread which engages with that of the container. The containers can be provided with a continuous thread or with projections that form the thread. Especially with short thread approaches, it is not necessary that these have an incline. Such threads, which are known, for example, for closing jam and jam jars, are also referred to as twist-off threads. In the case of containers with twist-off threads, the closure cap has projections which interact with the threaded approaches of the container.

In the case of screw closures made of deep-drawing material, for example made of aluminum or steel, the thread of the closure cap which meshes with the thread of the container must be produced by deforming the side walls of the closure cap. In conventional closures, the thread is often produced by a so-called rolling process. For this purpose, a cap blank is placed on the filled container without a thread and the outer wall of the screw cap is pressed in with a suitable device such that a thread in the screw cap matching the thread of the container is created. Damage to the container can occur, in particular in the case of glass containers, parts of the thread attachment can splinter and get into the interior of the container. This can lead to impairment of the _% consumer.

It is therefore an object of the invention to provide a screw closure for threaded containers, in which damage to the container is to be avoided. The thread of the screw closure should moreover be simple and inexpensive to produce, moreover the forces required to open the closure should be safely transmitted to the threaded ring. This object is achieved in a screw closure of the type mentioned with the help of the features mentioned in claim 1. Because the screw closure is provided with a threaded ring which has at least one projection which engages in the thread of the container, it is no longer necessary to provide the screw closure itself, that is to say to provide its closure cap with a thread. Damage to the container is thereby excluded. It is impossible for the consumer to be endangered, for example by broken glass.

In a particularly preferred embodiment of the screw closure, the projection serving as the thread thereof is arranged on a tab which merges into a spacer strip. This is arranged between the closure cap of the screw closure and the container to be closed in such a way that the screw closure is centered securely. This ensures reliable functioning of the projection of the threaded ring which acts as a thread.

In order to particularly ensure the engagement of the projections serving as threads, in a preferred embodiment of the screw closure, a spacer strip is arranged in each case with respect to a projection. This can itself have a projection. With such a design of the screw closure, such high forces can be ensured that a safe opening and closing of the container is ensured by means of the screw closure.

A screw closure in which the threaded ring is designed as a guarantee ring is particularly preferred. This has at least one area that the first opening the container is permanently deformable or destructible. Such a guarantee ring ensures that the consumer can check the first opening of the container. In this way, the consumer can make sure that he has an undamaged container in his hands.

Also preferred is a screw cap that has the features mentioned in claim 10. By dividing the threaded ring into an upper first ring element and a lower second ring element, this can be produced particularly easily in the plastic injection molding process. In particular, it is ensured that the Entfor tion of the ring elements is easily possible. Because of the division of the ring into two, different materials can be selected for the upper and lower ring element. In this case, particular consideration can be given to the respective loads on the elements.

The upper and lower ring elements are preferably connected to one another by friction and / or positive locking, by welding or by gluing. This results in an optimal functional unit from the two ring elements.

A preferred embodiment of the screw closure is characterized in that a positive connection is provided between the ring elements, which causes a hooking between the ring elements when the two elements move relative to one another. This also results in an optimal functional relationship between the two elements. In addition, a screw closure is preferred, in which on one ring element there is a ring wall provided with positive locking means on the inside and on the other ring element a second ring wall provided with positive locking means on the outside. The inside diameter of the first ring wall is matched to the outside diameter of the second ring wall in such a way that their form-locking means interlock. Such a design of the two ring elements results in a particularly large engagement surface between the two elements.

A further embodiment is characterized in that the ring walls of the ring elements are conical and are matched to one another in such a way that the two ring elements are automatically centered when they are mounted in the closure cover.

The form-locking means are particularly easy to manufacture if they have sawtooth-shaped projections. These can preferably be aligned in such a way that when the ring elements are rotated relative to one another, they snap into place, so that optimum transmission of force is ensured.

The ring elements are preferably provided on their outer side with an annular bead which is arranged in an annular groove in the closure cap. A structure of this type can additionally ensure good power transmission between the elements. In such cases, in which only slight forces have to be transmitted, a positive fit between the ring elements can be dispensed with with such a screw closure. It is then sufficient to ensure only a frictional connection. Also preferred is a screw closure in which the guarantee ring is provided on its inside with at least one tab which projects in the direction of the central axis of the guarantee ring and which, when the closure rotates during opening of the container, into a recess on the outer surface of the Engages container. So while the screw cap is rotated, a rotation of the guarantee ring is prevented by the hooking of the tab with the container. As a result, the guarantee is sheared off the threaded ring or the associated ring element, the lower ring element.

Particularly preferred is an embodiment of the screw, wherein the plate intersecting an angle with the origin, through the Mit¬ of the guarantee ring center axis line extending ein¬ closes, wherein the angle ranges between 5 ° to 85 ^Å, preferably from 20 ° to 70 °, in particular in the range from 35 ° to 55 ". On the one hand, such an orientation of the tab ensures secure hooking with the recess on the outer surface of the container. On the other hand, when the screw cap is turned, the tab is tilted, which This has the consequence that the retaining webs between the guaranteeing ring and the threaded ring or the lower ring element forming a predetermined breaking line are not only loaded in the circumferential direction by the hooking of the tab, but also This double loading of the holding webs leads to a particularly rapid and Low-force separation of the predetermined breaking line. The screw closure is preferably designed such that the thickness of the tab is selected so that it acts as a spring element and presses elastically resiliently against the outer surface of the container to be closed. Such a structure optimally compensates for differences in tolerance both of the outer container surface and of the diameter of the closure or guarantee. In any case, it is ensured that the tab rests on the outside of the container under pre-tension and thus engages with certainty in the associated recess.

In a particularly preferred embodiment of the closure, a weakening line or recess is provided in the outer surface of the guarantee ring. The tabs are arranged over a large area of the circumference of the guarantee ring. However, the area with the line of weakness is free of such tabs. This ensures that the guarantee in this weakened area is not pressed outwards by the pretensioned tabs, as a result of which an opening would incorrectly be indicated.

Furthermore, a screw closure is preferred which has the features mentioned in claim 31. It is particularly advantageous that the threaded ring engages with a locking device in the bottom region of the closure cap via the latching projection, so that when the cap is rotated it is ensured that the threaded ring is set in rotation. For this purpose, the locking element is non-rotatably connected to the cap. An embodiment is preferred in which the locking element is designed as a ring running in the transition area between the bottom and side wall of the closure cap. The manufacture of such a locking element is particularly simple and therefore inexpensive.

In a further development of the screw closure, the locking element is designed as part of the seal arranged in the bottom region of the closure cap. Since a seal is provided anyway on the bottom of the container, such a design of the locking element is particularly easy to manufacture.

In addition, an embodiment of the screw closure is preferred, in which the latching projection is designed as a circumferential jacket region which arises from the top of the threaded ring and which engages with the locking element with its upper edge. A closure of this type is distinguished by the fact that a good frictional connection between the threaded ring and the closure cap is ensured, moreover the friction between the closure cap and the container is greatly reduced. In particular if the contents of the container contain sugar, sticking of the screw cap to the container thread is practically excluded.

Finally, an embodiment of the screw closure is preferred, in which the latching projection designed as a continuous ring jacket has at least individual areas provided with teeth, which engage with the locking element. With a screw cap of this type, a special ensures a good frictional connection between the threaded ring and the sealing cap.

Further advantages and configurations result from the remaining subclaims.

The invention is explained in the following with the aid of the figures representing various exemplary embodiments. As an example, a guarantee ring is shown as a threaded ring, which has a ring part that can be opened when the container is opened for the first time. It shows:

1 shows a screw closure with a threaded ring designed as a guarantee ring;

Figure 2 shows a screw cap placed on a container;

FIG. 3 is a top view of a threaded ring designed as a guarantee ring;

FIG. 4 shows a side view of a threaded ring cut along the line IV-IV shown in FIG. 3;

FIG. 5 shows an enlarged partial view of a threaded ring cut along the line V-V shown in FIG. 3;

FIG. 6 shows a further enlarged partial view of the threaded ring along the line VI-VI drawn in FIG. 3;

FIG. 7 shows an enlarged illustration of a further region along the drew line VII-VII cut threaded ring;

FIG. 8 shows a partial section through an undamaged screw closure screwed onto a container;

FIG. 9 shows a partial section through a screw closure without a container;

Figure 10 is a plan view of an upper ring element of the threaded ring of the screw closure;

FIG. 11 shows a section running through the central axis of the upper ring element along the line XI-XI shown in FIG. 10;

FIG. 12 shows a section along the line XII-XII shown in FIG. 11 perpendicular to the central axis of the upper ring element;

FIG. 13 shows a bottom view of a lower ring element of the threaded ring of the screw closure;

FIG. 14 shows a section through the central axis of the lower ring element;

FIG. 15 shows a section along the line XV-XV shown in FIG. 14 through the lower ring element;

Figure 16 is a partial section through a screw cap placed on a container;

FIG. 17 shows a cross section through a threaded ring of a screw closure according to FIG. 16; FIG. 18 shows a cross section through a further exemplary embodiment of a threaded ring of a screw closure according to FIG. 16;

FIG. 19 shows a cross section through a further exemplary embodiment of a screw cap placed on a container and

FIG. 20 shows a cross section through the screw closure according to FIG. 19.

In the screw closure according to the invention, the closure cap can consist of a resistant, dimensionally stable plastic or of thermoformable material, such as aluminum or steel. The threaded ring preferably consists of an elastic material such as plastic.

Figure 1 shows a screw cap 1 in section. It has a metallic closure cap 3, which is essentially cup-shaped. The side wall 5 of the closure cap has on its edge facing away from the bottom 7 of the closure cap an annular bead 9 which at least partially encloses a threaded ring 11. The threaded ring is inserted into an annular groove enclosed by the annular bead 9. The outer edge of the closure cap 3 is flanged so that the threaded ring 11 is held securely in the annular groove of the annular bead 9 by a flanged edge 13.

The threaded ring is here provided in its upper edge region with a projection 15 which projects in the direction of the central axis 17 of the screw closure 1 or of the threaded ring 11. The projection starts from a tab 19, which is in its upper, the bottom 7 the area facing the closure cap 3 merges into a spacing strip 21.

The projection 15 of the threaded ring 11 meshes with a thread provided on a container to be closed or with individual latching or threaded projections. The projection thus serves as the thread of the closure 1, which otherwise has no thread. In particular, the side wall 5 of the closure cap 3 is flat except for the annular bead 9.

In the exemplary embodiment shown in FIG. 1, the threaded ring 11 is designed as a guarantee ring and has a lower ring part 23 which is essentially V-shaped in cross section. From a side wall 25 of the lower ring part, which is essentially aligned with the inner surface of the threaded ring lying in the annular groove 9 formed in the ring groove 9, a barb 27 projecting obliquely inwards and upwards, forming a truncated cone shell, which can engage under a projection or the lower thread projection of the container. The barb can be designed as a continuous wall area, but can also consist of individual segments.

The closure 1 shown in FIG. 1 has a sealing insert 29 in the transition region between the bottom 7 and the side wall 5 of the closure cap 3.

FIG. 2 shows a closure 1 with a threaded ring 11 placed on a container 31. The container can be, for example, a glass bottle or a glass for preserves. The same parts are provided with the same reference symbols. so that their detailed description can be omitted.

From the illustration it is readily apparent that the screw closure 1 screwed onto the container 31 is securely held by the fact that the projection 15 of the threaded ring 11 meshes with the thread 33 of the container 31. The spacer strip 21 lies between the side wall 5 of the closure cap 3 and a thread of the container 31. It serves to center the threaded ring in the threaded area of the container. This ensures a secure engagement of the projections 15 serving as threaded knobs in the thread 33 of the container 31. It does not matter whether the thread 33 is a continuous thread or individual thread attachments or locking projections on the outside in the neck region of the container 31.

The illustration in FIG. 2 also shows that the barb 27 of the lower ring part 23 engages under the lower thread or under a suitable projection or extension provided on the neck of the container 31. The barb is preferably designed to be resilient so that a secure engagement is ensured.

It is readily apparent that the screw cap 1 can be securely screwed onto and unscrewed from the container, although the cap 3, in particular its side wall 5, has no thread. The projection 15 of the threaded ring 11 takes on the function of a thread. When the screw cap 1 is opened for the first time, the barb 27 hooks under the lowest thread of the container 31, so that the lower ring part 23 is torn off or blown open by the threaded ring 11. The lower ring part 23 is connected to the remaining threaded ring 11 via a predetermined breaking line, as will be explained in more detail below.

Figure 3 shows the enlarged threaded ring 11 in plan view, seen from the bottom 5 of the cap 3. The same parts are provided with the same reference numerals, so that their detailed description can be dispensed with.

The upper part of the threaded ring 11, which lies in the annular groove enclosed by the annular bead 9, forms the outer boundary surface of the threaded ring. The projections 15, which are formed on tabs 19 extending from this ring part (see FIGS. 1 and 2), project into the interior of the ring part and can thus engage with a thread on the container.

The exemplary embodiment shown in FIG. 3 is provided with three projections 15 serving as threads. The regions 27a and 27b of the barb 27 of the lower ring part 23 adjoining the projections 15 end in V-shaped incisions in the barb 27. The projections 15 are evenly distributed on the circumference of the threaded ring 11, that is to say at a distance of 120 °. In the area of the projections 15, incisions 35 are provided in the wall area of the lower ring part 23 serving as barb 27. The segments 27a and 27b of the wall area of the lower ring part serving as barb 27 also project into the interior of the threaded ring 11. They are preferably springy formed so that they abut the outer wall of the container 31 and engage securely under the corresponding projection of the container.

On the outer edge of the threaded ring 11 there are recesses 37 which increase the friction between the closure cap 3 and the threaded ring 11, so that a secure positive fit is ensured. It is ensured that when the closure cap 3 is rotated, the threaded ring 11 also moves and the thread function of the screw closure can take over safely.

In FIG. 3, tear-off webs 39 are also indicated, which connect the part of the threaded ring 11 lying in the ring groove and the lower ring part 23, a predetermined breaking line being formed. This will be discussed in more detail with the help of the following figures.

Figure 4 shows a section through the threaded ring 11 along the line IV-IV Figure 1. The same parts are provided with the same reference numerals. In this illustration, the upper ring part of the threaded ring 11, which engages in the annular groove formed by the annular bead 9, can be clearly seen. The illustration shows a projection 15 in section and one in a perspective view. It can be clearly seen that the projection 15, which meshes with the thread of the container, starts from a tab 19, which protrudes upwards into a spacer strip 21. The lower ring part 23 of the threaded ring 11 is connected to the upper ring part of the threaded ring by means of thin tear-off webs 39 arranged at a distance from one another, so that a predetermined breaking line 41 is formed, on which the lower ring part is torn off from the upper ring part can. The illustration in FIG. 4 clearly shows once again the wall regions 27, which emanate from an essentially perpendicular wall 25 of the lower ring part 23 and serve as barbs. In the area of a projection 15, incisions 35 are provided here, ie the wall area of the lower ring part forming the barbs is not continuous. In the area of the incisions 35, the lower ring part 23 is connected via a web to the upper ring part of the threaded ring 11, the width of which corresponds approximately to the width of the tab 19.

The segment 27b of the wall area of the lower ring part 23 serving as barb 27 is followed by a V-shaped cut 43 in plan view according to FIG. 3, which serves as a vertical cut. In this area, the thickness of the perpendicular wall 25 of the lower ring part 23 is thinner than in the other areas. When the screw cap is opened for the first time, the lower ring part 23 can be opened here.

In FIG. 4 it is indicated by a broken line that the projection 15 and the spacer strip 21 can be formed as part of an annular wall R starting from the upper ring part of the threaded ring 11. This gives the threaded ring a particularly high stability. The height of the ring wall is preferably greater than the height of a projection 15 measured in the vertical direction. The area of the ring wall projecting beyond the projection serves, like the ring wall area between the individual projections, as a spacer. The function of this reichs thus corresponds to the function of the spacer strips.

FIG. 5 shows an enlarged section along the line V-V in FIG. 3 through the threaded ring 11. The same parts are provided with the same reference numerals.

In this illustration, a recess 37 can clearly be seen, which is part of a so-called wavy grinding of the threaded ring 11 and ensures a better positive fit between the closure cap and the threaded ring. The upper part of the threaded ring 11 located in the annular groove 9 formed by the annular bead 9 is connected to the lower ring part 23 via the tear-off webs 39, the tear-off webs extending on the inner surface of the upper ring part of the threaded ring 11 and on the upper side of the vertical one running wall sections 25 of the lower ring part 23 open. The threaded ring 11 is preferably produced by injection molding, so that the tear-off webs are formed on the upper and lower ring part. The wall areas of the lower ring part serving as barbs 27 extend from the lower boundary edge of the vertical wall sections 25 of the lower ring part.

The tear-off line 41 is formed by the tear-off webs 39 arranged at a distance.

Figure 6 shows, in enlargement, a extends along the line VI-VI in Figure 3 section through ^'a projection 15 of the threaded ring 11. Identical parts are provided here with the same reference numerals. It can be seen that the projection 15 starts from a tab 19 which arises in the upper inner region of the upper ring part of the threaded ring 11, which lies in the annular groove 9 formed by the annular bead. The tab 19 continues in an upwardly directed spacer strip 21. It was shown with reference to FIG. 4 that the lower ring part 23 is connected in the area of the tab 19 via a web 45, the width of which corresponds to that of the tab 19. In the area of the web 45, the vertical wall area 25 of the lower ring part 23 is designed to be thinner than in the other areas.

FIG. 7 shows an enlarged section through the threaded ring 11 along the line VII-VII in FIG. 3. The section runs through a vertical incision 43, which can also be seen in FIG. The same parts are provided with the same reference numerals.

In the area of the vertical incision 43, the perpendicular wall 25 of the lower ring part 23 is designed to be even thinner than in the area of the web 45. The area of the origin of the wall area serving as barb 27 at the lower edge of the lower ring part 23 is also very thin .

The predetermined breaking line 41 formed by the tear-off webs 39 continues in the area of the vertical incisions 43.

The functions of the screw cap are discussed in more detail below. If the closure cap 3 of the screw closure 1 is made of a thermoformable material, as is indicated on the basis of FIGS. 1 to 2, the upper part of the Threaded ring 11 inserted into the annular bead 9. The bottom edge of the closure cap 3 is then flanged, so that a flanged edge 13 is formed and the threaded ring 11 is firmly connected to the closure cap 13. It is also possible to press the threaded ring into the fully flanged groove and snap it into place. In order to prevent a relative movement between the closure cap 3 and the threaded ring 11, a serrated edge with recesses 37 is provided here, which ensures increased friction. It is also possible, when flanging the flanging edge 13 to pierce it at individual points, so that holes or depressions are formed in the flanging edge 13 here. Due to the burr of the holes or the recesses, a firm positive connection is created with the underside of the threaded ring 11, so that twisting of the threaded ring within the closure cap is prevented.

The closure cap 3 can also consist of a rigid plastic. The connection between the closure cap and the threaded ring can be produced by snapping or stamping the two parts into one another. The inside of the closure cap and the outside of the threaded ring can be provided with rifles so that a mutual rotation, a relative movement of the two parts, is excluded.

The screw cap produced in this way is screwed onto a filled container, a bottle, a preserving jar or the like. Since the threaded ring 11 is made of an elastic material, preferably plastic, the wall areas of the lower ring part 23 serving as hooks 27 are pivoted in the direction of the vertical wall areas 25 without causing an overextension of the lower ring part. After the screw cap 1 has been put on or screwed on, the barbs 27 engage under suitable projections, for example threads, of the container 31 and spring in the direction of the outer wall of the container or in the direction of the longitudinal axis 17 of the screw cap 1.

When the container is closed, the projections 15 of the threaded ring 11 engage in the thread 33 of the container 31.

When the container is opened for the first time, the projections 15 also serve as the thread of the closure 1. When the closure cap 3 is rotated, the closure 1, together with the ring part 11, lifts off the container 31. The barbs 27 hook onto the suitable projections of the container 31. The barbs cause the lower ring part 23 to be overstretched so that it breaks off along the predetermined breaking line or tear line 41 from the upper ring part and in the region of the vertical incisions 43 is blown up. The resulting three segments of the lower ring part 23 are pressed outwards by the barbs 27. The consumer can reliably recognize the first opening of the container by this.

In order to be able to apply the forces required when opening the first time, the projections 15 must mesh with the thread 33 of the container 31. The spacing strips 21 of the tabs 19 serve to center the threaded ring 11 on the neck of the container 31. They lie in the space between the vertical side wall region 5 of the closure cap 3 and the outer surface of the container 31.

According to FIG. 3, it is possible to assign a spacer strip 21 to each projection 15. In the exemplary embodiment shown, three projections and spacer strips are provided as examples.

However, it is also possible to provide a spacer strip in each case opposite a projection 15 so that the projection is held on the thread 33 of the container 31. The spacer strips can in turn be provided with a projection.

In principle, the projections 15 could also start directly from the threaded ring 11. Due to the fact that the projections 15 are connected to the threaded ring 11 via a tab 19, a certain spring action is made possible, so that the mouth or diameter tolerances of the container 31 can be compensated for.

After all, it can be seen that the screw cap 1 is easy to manufacture without the need for a rolling process to produce a thread. Damage to the mouth area of the container to be closed can thereby be excluded. In a simple and therefore inexpensive way, it is possible to create a screw closure with a thread that can not only interact with normal continuous threads of a container, but also with individual thread projections of so-called twist-off containers. In addition, it is possible to design the threaded ring serving as a thread as a guarantee ring, whereby the first opening of a container is certain to be recognizable to the consumer.

FIG. 8 shows a partial section through a screw closure 1 'which is placed on a container 3 ¹ . The figure only shows the upper mouth region of this container, which is provided with a thread on its outside. The thread can consist of continuous helical lines running around the outside of the container or of individual thread attachments 5 '. It is not necessary for the thread attachments to have a pitch. It is sufficient if these, like a bayonet lock, run horizontally and end in a stop. Such thread approaches are provided for example in jam jars, but also in bottles for juices or milk.

The screw cap 1 • has a cap 7 ', which can consist of a resistant plastic or a thermoformable material, for example sheet metal, in particular aluminum. The bottom 9 ^{1 of} the closure cap 7 'is essentially flat and is provided on its inside facing the container 3 * with a seal 11 ¹ , which can be annular.

The side wall 13 of the closure cap ^• merges at its lower end remote the bottom 9 ¹ in a Ring¬ bead 15 'on which includes nut on its inside a Ring¬. The outer diameter of the ring bead is slightly larger than that of the side wall 13 '. The annular bead 15 'encloses a threaded ring which has an upper ring element 17 * and a lower ring element 19'. The upper ring element is provided on its inner side facing the central axis 21 * of the threaded ring with a threaded projection 23 'which comes to rest under the threaded shoulder 5 - when the screw closure 1' is screwed onto the container 3 *. The thread projection 23 'forms the thread of the screw closure 1', in which the closure cap 7 'has no thread in its side wall 13'.

At least one thread projection is provided on the inside of the threaded ring; The exemplary embodiment shown here is provided with three thread projections 23 'distributed uniformly around the circumference of the screw closure 1'.

It can be seen from the illustration that the upper ring element 17 'is provided with an annular bead 25' which lies in the annular groove of the closure cap 7 'which is surrounded by the annular bead 15'. The ring-shaped bead does not need to be continuous; it is also possible to provide some bead segments on the outside of the upper ring element.

The upper ring element 17 'continues in the direction of the bottom 9' of the closure cap 7 'in a spacer lug, which in this embodiment is designed as a continuous spacer ring 27'. It serves to center the screw cap 1 'on the container 3'. Furthermore, it prevents direct contact between the closure cap 7 'and the container 3'. and thereby reduces the frictional forces when screwing the screw cap on and off.

The lower ring element 19 'also has an annular bead 29' which is arranged in the annular groove enclosed by the ring bead 15 * of the closure cap 7 '.

The height of the annular bead 15 * or that of the annular groove is matched to the height of the annular beads of the upper ring element 17 'and the lower ring element 19' in such a way that they are firmly enclosed. The ring-shaped bead 25 'of the upper ring element 17' lies firmly against the upper boundary wall 31 'of the ring groove and the lower boundary wall of the ring-shaped bead of the lower ring element 19 • against the lower boundary wall 33' of the ring groove. The lower boundary wall 33 'can be formed by U flanging the cap 7'. However, it is also possible to preform the ring groove and to snap the threaded ring into this ring groove.

A guarantee ring 35 'is connected to the lower ring element 19', a predetermined breaking line 37 'being provided between these two parts. This can consist of a thin material wall, but also, as in this exemplary embodiment, of individual retaining webs.

Provided on the outside of the container 3 'underneath the guarantee ring 35', seen from the central axis 21 ', is a circumferential safety bead 39', which protects the guarantee ring against unintentional damage but also against manipulation. The guarantee ring 35 'is also protected by the fact that the outer diameter of the ring bead 15 'is substantially larger than that of the guarantee. This also prevents accidental damage.

A plurality of tabs 41 'extend from the inside of the guarantee ring facing the central axis 21' and press elastically against the outside of the container 3 '. In the area of the guarantee ring or these tabs, this is provided on its outside with at least one, preferably a plurality of latching depressions into which the tabs can engage.

Starting from the underside 45 * of the upper ring element 17 'is a first ring wall 47 * which extends obliquely outwards at an angle and which is provided with form-locking means. Correspondingly, a second ring wall 51 'runs obliquely inwards from the upper side 49' of the lower ring element 19 ', which in turn is provided with positive locking means. A reverse design of the ring elements is also possible.

The positive locking means provided on the ring walls 47 'and 51' interlock, so that a relative movement or twisting of the upper ring element 17 'relative to the lower ring element 19' is avoided.

FIG. 9 shows a partially cut screw closure 1 'without a container to be closed. Parts which correspond in FIGS. 8 and 9 are provided with the same reference symbols. This illustration shows the tabs extending from the guarantee ring 35 'and projecting in the direction of the central axis 21' 41 'clearly visible. In this embodiment, the width of the tabs 41 'corresponds in its origin to the height of the guarantee ring 35'. It is clear that the width of the tabs 41 'decreases in the direction of their end opposite the origin. The upper edges of the tabs 41 'are all in one plane. The upper edge of the guarantee ring 35 'also lies in this plane.

FIG. 10 shows a top view of the upper ring element 17 'of the threaded ring. Parts that correspond to those shown in FIGS. 8 and 9 are provided with the same reference numerals.

It can be seen that the exemplary embodiment shown here is provided with three thread projections 23 'which protrude from the inside of the upper ring element 17' and project in the direction of its central axis 21 'and which form the thread of the screw closure 1'.

The inner surface of the upper ring element continues in the spacer ring 27 '. The outer diameter of this ring is smaller than that of the annular bead 25 'of the upper ring element 17'.

The top of the annular bead 27 • is smooth here. However, it can also be provided with projections or depressions in order to improve the frictional connection to the annular bead 15 'of the closure cap 7' of the screw closure 1 '.

FIG. 11 shows a section running through the central axis 21 'of the upper ring element 17'. Parts those which correspond to the previous representations are provided with the same reference numerals.

The illustration shows that the upper ring element 17 'is designed to be relatively stable in the region of the annular bead 25', as a result of which the forces applied by the thread projections 23 'are well absorbed and diverted into the ring bead 15 of the closure cap 7' can be. The shape of the projections 23 'is also clear, which can in principle be of any design, whereby they must be adapted to the thread of the container.

The projections have an essentially rectangular outline and are practically trapezoidal in cross section, their base coinciding with the inner surface of the upper ring element 17 '. In this embodiment, the lateral boundary surfaces of the projections are inclined at an angle of 30 ° with respect to the horizontal. The height of the protrusions measured in the radial direction is approximately half the width measured parallel to the central axis. The extent measured in the circumferential direction is approximately twice as large as the width of the projections measured in the direction of the central axis 21 '.

The ring wall 47 'extending from the underside 45 * of the upper ring element 17' is here inclined at an angle of approximately 30 ° with respect to the vertical. From the illustration it can be seen that depressions are provided in the ring wall 47 'which are intended to result in a form fit with the lower ring element 19. The thickness of the spacer ring 27 'is on the between the cap 7 * and the thread of the Adjusted container 3 'provided space. The height of the spacer ring 27 'depends on the height of the threaded area on the outside of the container 3'.

A section along the line XII-XII drawn in FIG. 11 perpendicular to the central axis 21 'of the upper ring element 17' is shown in more detail in FIG. Parts that correspond to those of the previous representations are provided with the same reference symbols. FIG. 12 shows that on the first ring wall 47 * several projections 53 'are provided as form-locking means, the cross section of which is sawtooth-shaped, so that stop faces 55' directed clockwise or in the direction of rotation are formed. It is also possible that the cross section of the projections 53 ', for example. is triangular. In any case, the transmission of force when screwing in and screwing on is essential.

In this exemplary embodiment, the projections 53 'are only provided in the area of the threaded projections 23'. However, they can also be provided on the entire ring wall 47 'of the upper ring element 17'.

FIG. 13 shows a bottom view of a lower ring element 19 '. Here, too, parts that correspond to such previous representations are provided with the same reference numerals.

It can be seen that the lower boundary surface of the annular bead 29 ', which lies against the lower boundary wall 33' of the annular groove, is flat. However, it is also possible to provide recesses and / or projections here that are suitable for one Ensure positive locking between the sealing cap 7 'and the lower ring element 19'.

It can be seen that the predetermined breaking line 37 'in this embodiment is formed by a plurality of holding webs 57' which are arranged at a distance from one another. The number of retaining webs depends on the material of the lower ring element 19 ', which is preferably made of plastic. The holding webs are provided here on the outside of the guarantee 35 '. They have an essentially triangular cross section, the base of this triangle coinciding with the outside of the guarantee ring. The upper side of the holding webs merges into the lower side of the lower ring part, so that a connection is formed between the guarantee ring 35 'and the lower ring element 19'.

At least one tab 41 * arises from the inside of the guarantee ring, which, with a line intersecting the origin of the tab and the central axis 21 ', forms an angle from 5 "to 85 °, preferably from 20 ° to 70 °, in particular from 35 ° to 55 The length of the tabs is selected such that they lie on the outside of the container 3 to be closed. The material of the guarantee ring or of the lower ring element 19 is selected such that the tabs 41 are pretensioned on the Lie on the outside of the container, ie serve as spring elements, thereby compensating for tolerance differences, that is to say fluctuations in diameter of the container or of the guarantee ring. In the exemplary embodiment shown here, a plurality of tabs 41 'are provided, specifically over a region which corresponds to an arc with an opening angle of 210 °. This angular range can also be between 360 ° and 180 °, preferably between 250 ° and 200 °.

The wall thickness of the guarantee ring is thinner in the area in which the tabs 41 'are provided than where no tabs originate. Approximately in the middle of the area without tabs there is a material weakening, here preferably a recess 59 ', which here runs parallel to the central axis of the closure. The guarantee ring 35 'is therefore not continuous. The regions adjacent to the recess 59 'are held by the holding webs 57'. In the area of this recess, no tabs 41 'are provided, so that the guarantee ring cannot be pressed outwards by the spring action of the tabs, as a result of which damage to the guarantee ring 35' and thus opening of the container 3 'would be indicated.

The thickness of the guarantee ring 35 'in the area in which the tabs 41 * are provided is approximately 30% of the thickness of the lower ring element 19'. The thickness of the guarantee ring is chosen so that when the container is opened, it is possible for the retaining webs to burst open. This function of the guarantee ring is discussed in more detail below.

FIG. 14 shows a section through the lower ring element 19 'through the central axis 21' of the screw closure. With the previous ones Representative parts are provided with the same reference numerals.

The second ring wall 51 'extends from the top 49' of the lower ring element 19 '. It is inclined at an angle of approx. 30 ° to the vertical. The angle is matched to that of the ring wall of the upper ring element 17 '. Form-locking elements are also provided on the ring wall of the lower ring element 19 '.

over a predetermined breaking line 37 *. is connected to the lower ring element 19 'of the guarantee ring 35', on the inside of which the tabs 41 'arise. The predetermined breaking line is formed by a plurality of retaining webs provided on the outside of the guarantee ring, which here have an essentially triangular cross section. However, it is also possible to provide holding webs of this type on the inside of the lower ring element 19.

From this illustration it can be seen particularly clearly once again that the upper edges of the holding webs 41 'lie in one plane, the upper edge of the guarantee ring also lying in this plane. It can also be seen that the width of the tabs decreases from their origin to their opposite end.

FIG. 15 finally shows a section through the lower ring element 19 ′ along the line XV-XV shown in FIG. 14. The same parts are again provided with the same reference numerals.

It can be seen that on the top of the lower ring member 19 ', or on its ring wall 51' as Protrusions 61 'serving form-locking elements are provided which have counter-clockwise or counter-clockwise stop surfaces 63.

The projections 61 'can also have a triangular cross section. It is also conceivable that these projections 61 ', like those on the upper ring element 17', have an essentially rectangular cross section. It is essential that a positive connection is formed between the two ring elements.

In this exemplary embodiment, the projections 61 'are distributed over the entire circumference of the lower ring element 19', so that a form fit is always guaranteed, regardless of how the upper ring element and the lower ring element are assembled. The projections 61 'are preferably distributed in a staggered manner in order to ensure a good locking of the ring elements.

If the two ring elements 17 'and 19' are put together and inserted into the annular groove formed by the annular bead 15 * in the closure cap 1-, the projections 53 * and 61 * act together. Because of the alignment of the abutment surfaces 55 * and 63 ', there is particularly good interlocking between the ring elements when the lower ring element 19 * is rotated clockwise, that is to say in the unscrewing direction, with the aid of the closure cap. As a result, a particularly good force is transmitted to the upper ring element 17 'in this case. In this way it is ensured that when a container 3 'is closed using the screw cap, the projections Comb 23 'with the threaded attachments 5' and thus a tight seal of the container is achieved.

From the above it is clear that the conical design of the ring walls ensures optimal centering of the two ring elements. However, it is also possible to provide the positive locking elements on a flat underside of the upper ring element and on a flat upper side of the lower ring element. Form-locking elements can be dispensed with entirely if the friction acting between the ring elements is sufficient to transmit the forces required to close and open the container.

The form-locking elements are preferably designed so that a secure claw takes place between the two ring elements.

In order to ensure a force transmission from the closure cap 7 'to the threaded ring consisting of the ring elements 17' and 19 ', a plurality of holes are preferably punched into the lower boundary wall 33' of the annular groove. As a result of the hole edge elevations projecting into the annular groove and pressing into the underside of the lower ring element 19 *, an optimal form fit between the closure cap 7 'and the threaded ring is ensured. The formation of the positive connection between the closure cap and the threaded ring is, however, freely selectable.

The function of the screw cap is discussed in more detail below:

The screw closure 1 *, like conventional closures, is placed on the container to be closed. or screwed tight. The projections 23 'of the upper ring element 17' of the threaded ring serve as the thread of the screw closure; that is, the closure cap 7 'is flat on its side wall 13'. It has no thread.

When the screw cap is screwed onto the container, the tabs 41 'of the guarantee ring 35' rest on the inside of the guarantee ring due to their spring action and slide along the outer surface of the container 3 '. The spring action of the tabs 41 'is selected so that the holding webs 57 * of the predetermined breaking line 37' are not burst open. If the screw cap 1 'is now unscrewed from the container 3', the tabs 41 'with their ends facing away from the guarantee ring 35' get caught in the recesses 43 'provided on the outside of the container. These have a corresponding stop edge for the front ends of the tabs 41. The tabs 41 'have the same spacing from one another in the figures. However, it is also possible to arrange them at different intervals on the guarantee ring 35 '. This improves the engagement with the container when the cap is screwed on.

By unscrewing the screw cap 1 ', the tabs 41' hook into the recesses 43 'of the container 3' in such a way that further rotation of the guarantee ring 35 'is not possible. There is a radial relative movement between the lower ring element 19 ^{• of} the threaded ring and the guarantee ring, as a result of which the retaining webs 57 'of the predetermined breaking line 37 ^! be sheared off. Not all Halte¬ be blown open webs, so ^'that the security ring 35 * on lower ring element 19 'hangs and is lifted off the container 3' with the screw cap 1 '.

After the front ends of the tabs 41 'have snapped into the recesses 43', when the screw cap is turned further, the tabs 41 'bend in such a way that the diameter of the guarantee ring 35' is widened. As a result, the retaining webs 57 'of the predetermined breaking line 37' are not only subjected to a force in the circumferential direction, but also radially outward. This double load on the retaining webs makes the predetermined breaking line particularly light, that is to say, it is blown open in a way that saves energy. As a result, an attempt to open is indicated particularly reliably.

The construction of the guarantee ring described here ensures that the predetermined breaking line 37 'is opened up after a very brief rotation of the screw closure 1'. This means that even without the screw cap being lifted by the thread when the container is opened, the guarantee ring is burst open. This is particularly important in the case of so-called twist-off closures, because there the thread attachments 5 'have no pitch. This means that the guarantee ring 35 'is blown off after only a brief twisting of the screw closure. An attempt to open is indicated even without the closure being lifted from the container 3 '. This reliably avoids that an existing vacuum inside the container 3 'is unrecognizable for the consumer. From the above it will be seen that the spring effect ^'of the lugs 41' for the function of Ga¬ rantierings is essential. Because the guarantee is composed of an upper ring element 17 and a lower ring element 19 ', a particularly well resilient part, for example made of plastic, can be selected for the lower ring element. The upper ring element must absorb the forces interacting with the threaded attachments 5 * and can therefore be made of a harder plastic.

After all, it can also be seen that the connection between the two ring elements can be permanent; for example, welding or gluing of the two parts can be selected.

If the simple manufacture of the ring elements is not important, for example in the case of small series, both elements can be produced together using the injection molding process. The guarantee ring can also be molded on at the same time.

In principle, the screw closure according to the invention can be used for any container. It is also possible to provide the threaded ring of the screw closure with a guarantee ring which is torn off or at least blown open by the rest of the threaded ring when the screw closure is first opened, so that the integrity of the container can be recognized immediately. A screw closure with a guarantee ring is shown in FIGS. 16 to 20 as an example. The embodiment of the screw closure 1 • 'shown in FIG. 16 has a metallic closure cap 3 ¹ ' and a threaded ring 5 '', which is designed here as a guarantee ring. This means that the threaded ring is provided on its underside with a lower ring part 1 - -, which is connected to the upper ring part 9 ″ of the guarantee ring via a predetermined breaking line. A resilient barb 11 '', which is designed as a truncated cone, arises from the lower ring part 7 '' and cooperates with a projection 13 '' which is provided on the outside of the container 15 '' on which the screw closure 1 '' is applied. The projection 13 ″ is here part of a thread 17 ″, which is provided in the upper mouth region of the container.

The cap 3 '' is substantially nap-shaped. Its side wall 19 '* has on its edge opposite the bottom 21 *' an inwardly projecting projection 22 '' which holds the threaded ring 5 ''.

While the closure cap 3 ″ has no thread on its side wall, the threaded ring 5 ** is provided on its inside with a thread projection 23 ″ which engages in the thread 17 ″ on the outside of the container 15 ″ . The projection 23 '' is provided here on the upper ring part 9 ¹ 'of the threaded ring. A locking projection 25 '* extends from the threaded ring in the region of the projection 23' * and extends upwards in the direction of the bottom 21 '' of the closure cap and interacts there with a locking element 26 '* designed here as a sealing ring. In the illustration according to FIG. 17, the threaded ring 5 ″ is removed from the closure cap of the screw closure. The same parts are provided with the same reference numerals.

The threaded ring 5 '• is provided with three latching projections 25' 'which extend from the base body of the upper ring part 9' 'and which are arranged in the region of the projection 23' 'serving as a thread. The number of locking projections and their arrangement are freely selectable. On the top, the locking projections 25 * • are provided with teeth 27 '' which engage in the sealing ring serving as locking element 26 * '. If there is sufficient contact pressure of the locking projection against the locking element, the toothing can be dispensed with. On the other hand, it is also possible to omit the teeth on the locking projection 25 ″ and to provide the locking element 26 ″ in the closure cap with teeth. Finally, it is also possible to provide both the locking projection and the locking element with a corresponding toothing.

From the illustration according to FIG. 17 it can be seen that the upper ring part 9 ″ is connected to the lower ring part 7 ″ via a predetermined breaking line 29 ″, which is formed by a plurality of tear-off webs 31 ″, which are provided between the upper and lower ring part are.

According to FIG. 17, a plurality of barbs 11 ′ * formed from the lower ring part 7 ″ have a truncated cone-shaped design. For example, in the range of the jump Vor¬ 23 ^'' respectively of the latching projection 25 * ', the lower annular part 7' * with a line of weakness or be provided with a vertical incision 33 '*, on which the lower ring part tears open when the screw cap is opened for the first time, so that the first opening of the container is reliably indicated.

FIG. 18 shows a further exemplary embodiment of a threaded ring, in which the same parts are provided with the same reference symbols.

This exemplary embodiment is distinguished by the fact that from the upper ring part 9 '* of the threaded ring 5a *' a continuous ring jacket serving as a locking projection 25a '* extends, the upper edge of which is arranged in the transition area between the bottom 21 *' and the side wall 19 • Interlocking element 26 * 'interacts.

In the case of a screw closure provided with such a threaded ring 5a ″, sticking between the closure cap and the container is practically impossible, even with contents containing sugar.

The upper edge of the locking projection 25a * ', which comes into engagement with the locking element provided in the closure cap, can be flat. With a suitable material pairing, in particular if the contact pressure is selected to be large enough, sufficient frictional forces can be built up which prevent the closure cap from rotating relative to the threaded ring. However, as shown in FIG. 18, it is possible, at least in the region of the projections 23 ″ serving as threads, to provide teeth 27a ¹ ′ on the upper side of the ring jacket 25a ′ ¹ , which engage in the locking element. The teeth can either only on the locking projection, only on the Locking element or be seen on both parts.

FIG. 19 shows a further exemplary embodiment of a closure cap which is provided with a two-part threaded ring 5b ″.

FIG. 19 shows a partial section through a screw closure 1b '• which is placed on a container 15b ¹ '. The figure shows only the upper mouth region of this container 15b '•, which is provided with a thread on its outside. The thread can consist of continuous screw lines running around the outside of the container or of individual thread attachments 17b ″. It is not necessary that the thread approaches have a slope. It is sufficient if these, like a bayonet lock, run horizontally and end in one stop. Such thread approaches are provided, for example, in jam jars, but also in bottles for juices or milk.

The screw cap 1b '' has a cap 3b ¹ ', which can be made from a resistant plastic or from a thermoformable material, for example steel sheet, preferably aluminum. The bottom 21b '* of the closure cap 3b' * is essentially flat and, on its inside facing the container 15b ' ^{•, is provided} with a locking element 26b ¹ ' which is designed as a seal and which here is ring-shaped but can also be designed as a disk. The side wall 19b '* of the closure cap merges at its lower end facing away from the bottom 21b *' into an annular bead 35 '' which includes an annular groove on its inside. The outer diameter of the ring bead is somewhat larger than that of the side wall 19b ".

The annular bead 35 '* encloses a threaded ring 5b' ¹ , which has an upper ring part 9b * 'and a lower ring part 7b''. The upper ring element 9b '• is provided on its inner side facing the central axis 37''of the threaded ring with a projection 23b''which serves as a thread and which comes to rest under the threaded shoulder 17b ¹ ' when the screw closure lb '* on the Container 15b ¹ 'is screwed on. The projection 23b ^»1 here also forms the thread of the screw closure 1b '', the closure cap 3b ' ¹ having no thread in its side wall 19b' ¹ .

At least one thread projection is provided on the inside of the threaded ring; the exemplary embodiment shown here is provided with three thread projections 23b * 'distributed uniformly around the circumference of the screw closure 1b *'.

It can be seen from the illustration that the upper ring part 9b * 'is provided with an annular bead 39' • which lies in the annular groove of the closure cap 3b * 'which is enclosed by the annular bead 35''. The ring-shaped bead need not be formed continuously; it is also possible to provide some bead segments on the outside of the upper ring element. The upper ring portion 9b '* sets in the direction of the bottom 21b ^1' of the closure cap 3b ^'' in a Rast¬ projection 25b '' on, the game in this exemplary embodiment is formed as a continuous ring casing. It serves to center the screw cap 1b '' on the container 15b ••, moreover it prevents direct contact between the cap 3b '' and the container 15b '' and thereby reduces the frictional forces when screwing the cap on and off Screw closure.

The lower ring part 7b '' also has an annular bead 41 '' which is arranged in the annular groove enclosed by the annular bead 35 * 'of the closure cap 3b' ¹ .

The height of the annular bead 35 '' or that of the annular groove is matched to the height of the annular beads of the upper ring part 9b '* and the lower ring part 7b *' in such a way that they are firmly enclosed. The annular bead 39 ″ of the upper ring element 9b ″ lies on the upper boundary wall 43 ^{″ of} the annular groove and the lower boundary wall of the ring-shaped bead 41 ″ of the lower ring element 19 ″ on the lower boundary wall 45 ″. the ring groove firmly. The lower boundary wall 45 ″ can be formed by flanging the closure cap 3b * ′ while the threaded ring is already inserted in the closure cap. However, it is also possible to pre-form the annular groove and to have the threaded ring engage exclusively in this annular groove.

A guarantee ring 47 '* is connected to the lower ring part 7b *', a predetermined breaking or weakening line 29b * 'being provided between these two parts. see is. This can consist of a thin wall of material, but also of individual tear-off webs, not shown here.

Provided on the outside of the container 15b '* below the guarantee ring 47' ', seen from the central axis 37' ', is a circumferential safety bead 51' ', which protects the guarantee ring against unintentional damage but also against manipulation . The guarantee ring 47 '* is also protected in that the outer diameter of the annular bead 35' * is larger than that of the guarantee. This also prevents accidental damage.

A plurality of tabs 53 ″ extend from the inside of the guarantee ring facing the central axis 37 ″ and press elastically against the outside of the container 15b ″. In the area of the guarantee or these tabs, this is provided on its outside with at least one, preferably a plurality of latching depressions 49 ″ into which the tabs 53 ″ can engage. •

Starting from the underside 55 ″ of the upper ring part 9b ″ is a first ring wall 57 ′ * which runs obliquely outwards at an angle and is provided with form-locking means. Correspondingly, from the upper side 59 ″ of the lower ring part 7b ′ ^1, a second ring wall 61 ″ extending obliquely inwards starts, which in turn is interlocked with form-fitting means e.g. B. is provided with a toothing or channels. A reverse formation of the ring elements is also possible. The form-locking means provided on the ring walls 57 ″ and 61 ″ interlock so that relative movement or twisting of the upper ring part 9b ^″ relative to the lower ring part 7 ′ * is avoided.

Figure 20 shows the patch in Figure 19 on a container screw cap lb ^"* partially in section. Parts corresponding in FIGS. 19 and 20 are provided with the same reference symbols. FIG. 20 shows once again the tabs 53 ″ emanating from the guarantee ring 47 ″, which project in the direction of the central axis 37 ″ of the screw closure. The width of the tabs 53 ^• 'corresponds to approximately the height of this exemplary example of the guarantee ring 47 *'. It decreases towards the end of the tabs 53 ″ opposite the origin thereof. The upper edges of the tabs 53 '' are all in one plane. The upper edge of the 47 '' guarantee ring also lies on this level.

The outer contour of the screw closure 1b '' shown in FIGS. 19 and 20 can also be selected differently. The circumferential bead 35 ' ^» can be omitted. Instead extends from the side wall 19b ^'' of inwardly projecting, circumferential projection 45 '' (see Figure 19) to the threaded ring 5b. ' ¹ securely in the cap 3b ¹ '.

Instead of the metallic cap, a plastic cap can be chosen, the material should be relatively rigid. The threaded ring can be fastened in a plastic sealing cap in any known manner. The threaded ring can be used in the plastic end cap are snapped into place. It is also possible to reshape the lower edge of the plastic sealing cap after inserting the threaded ring by cold working in such a way that individual projections or a continuous bead is formed which holds the threaded ring in the cap.

If the closure cap is made of plastic, it is possible to form the locking element as part of the cap. For example, a toothing in the transition area between the bottom and side wall of the plastic closure cap can be provided, into which a corresponding toothing of the locking projection of the threaded ring engages. But here too it is possible to apply a frictional force solely on the basis of contact forces which prevents the threaded ring from spinning relative to the closure cap. In this case, toothing can be dispensed with entirely.

From what has been said above it follows that, due to the latching projection which arises from the base body or the upper ring part of the guarantee ring and which engages with a locking element in the transition region between the bottom and side wall of the closure cap, the closure cap rotates ¬ compared to the ring nut is practically excluded. In the connection between the closure cap and the threaded ring, such high frictional forces or a positive or positive connection are generated so that the unit consisting of the threaded ring and the closure cap, the screw closure, can be safely unscrewed from the container. Even if the threaded ring is designed as a so-called guarantee ring and that to burst open necessary forces of the guarantee ring must additionally be applied by a rotary movement of the closure cap, a secure transmission of the rotary forces is guaranteed.

The transmission of the forces required to open the screw closure can finally also be ensured by the latching projections being glued or welded to the locking element.

Instead of a single projection on the threaded ring, projecting areas serving as threads or a continuous thread can be provided.

Claims

Expectations

1. Screw cap for a threaded container, characterized by a threaded ring (11) with at least one, in the thread (33) of the container (31) engaging, the thread of the screw cap (1) forming projection (15) ver¬ see is.

2. Screw closure according to claim 1, characterized gekenn¬ characterized in that the projection (15) on one of the threaded ring (11) outgoing tab (19) is arranged.

3. Screw closure according to claim 2, characterized gekenn¬ characterized in that the tab (19) merges into a spacer strip (21).

4. Screw closure according to one of claims 1 to 3, characterized in that at least two projections (15) are provided.

5. Screw closure according to claim 3 or 4, characterized in that a projection (15) is assigned at least one spacer strip (21).

6. Screw closure according to claim 3 or 4, characterized in that a spacer strip with or without a projection is angeord¬ net opposite a projection.

7. Screw closure according to claim 1, characterized gekenn¬ characterized in that the projection (15) on a from the threaded ring (11) originating ring wall (R) is angeord¬ net.

8. Screw cap according to claim 7, characterized gekenn¬ characterized in that on the ring wall (R) at least two projections (15) are provided.

9. Screw cap according to one of claims 1 to 8, characterized in that the threaded ring (11) is designed as a guarantee ring and has at least one permanently deformable or destructible region (23) when the container (31) is first opened.

10. Screw closure according to claim 9, characterized gekenn¬ characterized in that the threaded ring has an upper, first, the threaded projections (23 ') bearing ring element (17 *) and a lower, second ring element (19') on which the Guarantee ring (35 ') is attached, and that the upper and lower ring element are designed as separate rings.

11. Screw closure according to claim 1, characterized gekenn¬ characterized in that the upper ring element (17 ') and the lower ring element (19') by friction and / or shape Finally, by welding or by gluing together.

12. Screw closure according to claim 10 or 11, characterized in that the positive engagement between the ring elements is designed such that, when the two ring elements (17 ', 19') rotate relative to each other, a hooking between the ring elements occurs occurs.

13. Screw cap according to one of claims 10 to

12, characterized in that the upper ring element (17 *) is provided on its underside with projections (53 ') and / or depressions which with projections (61') and / or provided on the upper side of the lower ring element (19 ') Interaction of depressions.

14. Screw closure according to one of claims 10 to

13, characterized in that on the one ring element (17 ') a first ring wall (47') provided on its inside with positive locking means (53 ') and on the other ring element (19') one on the outside with positive locking means (61 *) provided second ring wall (51 ') is provided and that the inner diameter of the first ring wall is matched to the outer diameter of the second ring wall in such a way that the form-locking means of the ring elements interlock.

15. Screw closure according to claim 14, characterized in that the ring walls (47 ', 51') are conical.

16. Screw closure according to claim 14 or 15, characterized in that the positive locking means have sawtooth-like projections (53 ^» , 61 ').

17. Screw closure according to claim 16, characterized in that the projections (53 *) on the one ring element (17 *) aligned clockwise stop faces (55 ') and on the other ring element (63') aligned counterclockwise Have stop surfaces (63 ') so that twisting of the ring elements against one another is prevented at least in one direction.

18. Screw cap according to one of claims 10 to

17, characterized in that the ring elements (17 ', 19') are provided on their outside with an annular bead (25 ', 29') which engages in an annular groove in the closure cap (7 ').

19. Screw cap according to one of claims 10 to

18, characterized in that the guarantee ring (35 ') is provided on its inside with at least one locking projection (tab 41') which interacts with a recess (43 *) arranged on the outside of the container (3 *) .

20. Screw cap according to one of claims 10 to 18, characterized in that on the inside of the guarantee ring at least one in the direction of its central axis (21 ') projecting, serving as Rastvor¬ jump tab (41 *) is provided, which at one opening of the screw cap rotating movement of the guarantee ring (35 ') into the recess fung (43 ^» ) engages on the outer surface of the container (3 ¹ ).

21. Screw closure according to claim 20, characterized in that the tab (41 *) encloses an angle (a -) with the line intersecting its origin and passing through the central axis (21 ') of the guarantee ring (35'), and that the angle (<_ ') is in the range from 5 ° to 85 °, preferably in the range from 20 ° to 70 °, in particular in the range from 35 ° to 55 °.

22. Screw closure according to claim 20 or 21, characterized in that the width of the tab (41 ') in the region of its origin is approximately as large as the height of the guarantee ring (35').

23. Screw cap according to one of claims 20 to 22, characterized in that the width of the tab (41 ') decreases in the direction of its end opposite the origin.

24. Screw closure according to one of claims 20 to, 23 characterized in that the .thickness of the tab (41 ') is selected such that it acts as a spring element and presses elastically resiliently against the outer surface of the container (3 ¹ ) to be closed.

25. Screw cap according to one of claims 10 to 24, characterized in that the wall of the guarantee tiering (35 ') is seen with a thin-walled area which runs essentially parallel to the central axis of the guarantee ring (35 *).

26. Screw closure according to one of claims 10 to 24, characterized in that the wall of the Garan- tierings (35 ') is provided with a recess (59 *) which runs essentially parallel to the central axis (21') of the guarantee ring.

27. Screw cap according to one of claims 20 to 26, characterized in that on the inside of the guarantee ring (35 ^» ) several tabs (41 ^» ) are preferably arranged at the same distance from one another.

28. Screw closure according to one of claims 20 to 26, characterized in that on the inside of the guarantee ring (35 ^» ) a plurality of tabs (41 ^» ) are preferably arranged at different distances from one another.

29. Screw closure according to claim 27 or 28, characterized in that the tabs (41 ') are arranged in an area on the inside of the guarantee ring (35') and that the thin-walled area or the recess (59 ') in the tab-free area Area.

30. Screw cap according to claim 29, characterized in that the area provided with tabs (41 ') corresponds to a circular arc with an opening angle which is between 340 ° and 180 °, preferably between 250 ° and 200 °.

31. Screw closure according to one of claims 1 to 30, characterized in that the threaded ring (5 ''; 5a * '; 5b ^• ') with at least one in the direction of the bottom (21 ''; 21b ^" ') of the closure cap (3 * *; 3b '*) projecting locking projection (25 *'; 25b '') which interacts with a locking element (26 ''; 26b ' ^• ) which is arranged in the region of the bottom of the closure cap and is secured against rotation.

32. screw closure according to claim 31, characterized ge indicates that the locking element (26 ''; 26b ' ¹ ) as in the transition region between the bottom (21'*; 21b ' ¹ ) and the side wall (19'';19b' ¹ ) Closure cap (3 **; 3b '') arranged ring element is formed.

33. Screw closure according to claim 31 or 32, characterized in that the locking element (26 ''; 26b '*) is part of the closure cap (3'¹; 3b 'in the region of the bottom (21 *'; 21b * ') ¹ ) arranged seal is.

34. Screw closure according to one of claims 31 to 33, characterized in that the latching projection (25 * '; 25b' ') of the threaded ring is provided with a toothing (27' ') which in the locking element (26' '; 26b' ') intervenes.

35. Screw closure according to one of claims 31 to 33, characterized in that the locking element is provided with a toothing which engages with the locking projection.

36. Screw closure according to one of claims 31 to 33, characterized in that the locking element and the locking projection are provided with a toothing.

37. Screw closure according to one of claims 31 to 36, characterized in that the latching projection as an annular casing segment (25 * ') starting from the threaded ring (5 **) and extending as far as the locking element is formed.

38. screw closure according to claim 37, characterized ge indicates that at least one, preferably three ring jacket segments are provided as a locking projection (25 ' ^» ).

39. Screw closure according to one of claims 31 to 36, characterized in that the latching projection is designed as a continuous annular casing (25a '¹; 25b ¹¹ ) extending from the threaded ring and extending to the locking element.