Annular intermediate piece and method for manufacturing the annular intermediate piece

Abstract

The invention relates to an annular intermediate piece for mounting on a container, the annular intermediate piece comprising an inner annular element (30) and an outer annular element (20) encompassing the inner annular element (30), wherein - the outer annular element (20) has a connection space portion, and the inner annular element (30) has an annular central portion (36) and a connection element (32) projecting out from the annular central portion (36) towards the outer annular element (20) and protruding into the connection space portion, fitting in a form-fitting manner into the connection space portion at its outer edge being farther from the annular central portion (36), and - the outer annular element (20) has at least one pin element that protrudes into the connection element (32) or protrudes through the connection element (32). The invention also relates to a method for manufacturing the annular intermediate piece.

Description

[0001] ANNULAR INTERMEDIATE PIECE

[0002] TECHNICAL FIELD

[0003] The invention relates to an annular intermediate piece for mounting on a container, and to a method for manufacturing the annular intermediate piece.

[0004] BACKGROUND ART

[0005] The general trend of environmental protection efforts in the application of plastic materials points towards using as much recycled plastic as possible.

[0006] This also appears in the known approaches.

[0007] For example, in WO 2019 / 137597 A1 a cap is disclosed that has respective portions made of recycled and non-recycled plastic, the latter being in contact with the contents of the bottle on which the cap is mounted. There are also known approaches, in which a cap-like element is manufactured by moulding two materials on each other; such cap-like elements are disclosed in US 9,126,725 B1 , US 10,640,359 B1 , US 2020 / 0062459 A1 , US 11 ,097,457 B2, DE 4206244 A1 , and US 4,803,031 , while US 2008 / 0302753 A1 discloses moulding a resilient material outside for providing appropriate grip. Sometimes, moulding is applied for producing lettering from the layers moulded on one another, see for example WO 01 / 68468 A1 and FR 2775959 A1.

[0008] There also exist directives stipulating that plastic packaging materials and the plastic elements applied in them must contain recycled plastic in as high a percentage as possible. According to a current EU directive, plastics corresponding to packaging (see above) have to be made of at least in a given percentage of recycled plastic, otherwise a fine fee must be paid.

[0009] In line with that, in its commonly applied implementation the known annular intermediate piece - which is used for attaching dispensing guns to e.g. PUR foam cans - could only be utilised while paying a fine fee. The outward shape of the known annular intermediate piece is like the shape of the embodiment illustrated in the drawings of the present application. The known annular intermediate piece is made of original (non-recycled) plastic, for example polypropylene. In view of the known approach, there is a need for an annular intermediate piece that can be produced, manufactured in a more preferable manner compared to the known annular intermediate piece.

[0010] DISCLOSURE OF THE INVENTION

[0011] The primary object of the invention is to provide an annular intermediate piece which is free of the disadvantages of prior art approaches to the greatest possible extent.

[0012] A further object of the invention is to provide an annular intermediate piece that can be produced, manufactured in a more preferable manner compared with the known annular intermediate piece, and preferably comprises recycled plastic, and its application is not contrary to the directives in force.

[0013] The objects according to the invention can be achieved by providing the annular intermediate piece according to claim 1 and the manufacturing method thereof according to claim 12. Preferred embodiments of the invention are defined in the dependent claims.

[0014] An annular intermediate piece preferably meets various tests:

[0015] - the annular intermediate piece cannot break or crack (for example, its tabs may be prone to breaking or cracking) when it is mounted (snapped) on the container, e.g. a can, as it will be mentioned below in relation to the tests;

[0016] - the annular intermediate piece mounted on the can must withstand a given torque without being rotated on the can (i.e. , it must fit sufficiently tightly on the can);

[0017] - the annular intermediate piece cannot be damaged while prying it off the can (i.e., it must withstand prying applying a given moment).

[0018] During the development of the invention, we have found that an annular intermediate piece made entirely of recycled plastic fails these tests. Therefore, we have steered our development into a direction where different materials - differing e.g. in their production methods - are applied as base materials, i.e., preferably also recycled plastic. This, however, is a complex task due to the configuration of the annular intermediate piece (a configuration constraint is that the annular intermediate piece must be able to be applied as a replacement of the known annular intermediate piece).

[0019] BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Preferred embodiments of the invention are described below by way of example with reference to the following drawings, where

[0021] Fig. 1 illustrates in a spatial drawing an embodiment of the annular intermediate piece according to the invention (with a cover),

[0022] Fig. 2 illustrates the embodiment of Fig. 1 with the cover being lifted,

[0023] Fig. 3 illustrates the embodiment of Fig. 1 in a top view (with a cover),

[0024] Fig. 4 illustrates the embodiment of Fig. 1 in side view (also with a cover),

[0025] Fig. 5 illustrates the embodiment of Fig. 1 in a sectional drawing (with a cover),

[0026] Figs. 6A, 6B, and 7 illustrate in an embodiment the inner annular element in spatial bottom and top view, and side view drawings,

[0027] Fig. 8 illustrates the inner annular element according to Figs. 6A-7 in a top view drawing, indicating the section planes C-C and D-D,

[0028] Figs. 9 and 10 illustrate the sections C-C and D-D,

[0029] Fig. 11 illustrates in a spatial drawing the outer annular element in the embodiment also illustrated in Figs. 1 -5,

[0030] Fig. 12 illustrates the outer annular element according to Fig. 11 in a side view drawing,

[0031] Fig. 13 illustrates the outer annular element according to Fig. 11 in a top plan drawing, showing the section planes C-C and D-D,

[0032] Figs. 14 and 15 illustrate the sections C-C and D-D according to Fig. 13,

[0033] Fig. 16 illustrates the outer annular element according to Fig. 11 in a side view drawing, indicating the section plane E-E,

[0034] Fig. 17 illustrates the section E-E,

[0035] Fig. 18 illustrates the outer annular element in a bottom view,

[0036] Fig. 19 illustrates in a spatial drawing the annular intermediate piece according to the invention in the embodiment of Fig. 1 without a cap,

[0037] Fig. 20 illustrates the embodiment of Fig. 19 in a side view drawing,

[0038] Fig. 21 illustrates the embodiment of Fig. 19 in a top view, indicating the section planes C-C and D-D, Figs. 22 and 23 illustrate the sections C-C and D-D according to Fig. 21 , Fig. 24 illustrates the embodiment of Fig. 19 in a side view, indicating the section plane E-E,

[0039] Fig. 25 illustrates the section E-E,

[0040] Fig. 26 illustrates the embodiment of Fig. 19 in a bottom view, and

[0041] Fig. 27 illustrates the embodiment of Fig. 1 in a sectional view, placed on a bottle.

[0042] MODES FOR CARRYING OUT THE INVENTION

[0043] The invention is an annular intermediate piece for mounting (fixing) on a container (in relation to mounting on a container see also below). The annular intermediate piece according to the invention comprises an inner annular element (inner annular member; an inner annular element 30 in an embodiment, see in Figs. 6A-10 in various views), and an outer annular element (outer annular member) encompassing (surrounding, encircling) the inner annular element (an outer annular element 20 in an embodiment, see in Figs. 11 -18 in various views; the inner annular element 30 encompassed by the outer annular element 20 see e.g. in Figs. 5 and 19).

[0044] It is noted that the invention can be considered an intermediate piece in the sense that the gun is mounted with it to the connection portion of the container (as a denomination: container connection portion or container-connection portion; the container is e.g. a bottle, as well as the container itself can be implemented as a can or any other receptacle), as well as around a valve arranged therein (see also below). In such a case, the annular intermediate piece is circumferentially fixed (on)to the container connection portion, i.e. it is placed on(to) the container connection portion (see Fig. 27).

[0045] It is furthermore noted that the outer and inner annular elements could also be called simply “rings” or even “ring elements” or “ring-like elements”.

[0046] According to the invention, furthermore,

[0047] - the outer annular element has a connection space portion (see e.g. a connection space portion 42 in Figs. 14 and 15), and the inner annular element has an annular central portion (see e.g. an annular central portion 36 in Fig. 7) and a connection element (connection member, see e.g. a connection element 32 in Fig. 7; the connection element 32 received by the outer annular element can be observed e.g. in Fig. 5) projecting out from (protruding out from, extending out from) the annular central portion towards the outer annular element and protruding into the connection space portion, fitting in a form-closing manner into the connection space portion at its outer edge (outside edge) being farther (further) from the annular central portion (at the edge thereof located outside with respect to the annular central portion, i.e., lying outside relative to it; the term “outer edge” is applied in the sense of “outer fringe”, “outer rim”; fitting in a formclosing (shape-closing, shape / form-locking, shape / form-fitting) manner (fitting as being form-closed), i.e. fitting form-closing, being contacted; accordingly, these are arranged (as) fitting to each other, i.e. these contact along the desired portions as allowed by their shapes - i.e., their shapes close / (inter)lock to each other -, for example thanks to the “moulding-on” manufacturing preferably applied in case of the outer annular element), and

[0048] - the outer annular element has at least one pin element (tongue element) protruding into (projecting into, extending into) the connection element or protruding through (projecting through, extending through) the connection element (in the illustrated embodiment pin elements 24 are shown separately e.g. in Fig. 11 , and in an assembled figure in Fig. 23; in the illustrated embodiment a plurality of pin elements 24 are arranged; the at least one pin element naturally also protrudes into or through a receiving space portion or receiving cavity).

[0049] The annular intermediate piece (i.e., this is an intermediate piece in accordance with that this element is arranged between the gun and the container when the gun is mounted to the container) can be called an annular intermediate element (intermediary element), or an annular / ring or annular / ring-like shaped intermediate piece, or even an intermediate ring (intermediary ring). The term “gun ring” can also be used to refer to the annular intermediate piece.

[0050] The term applied for the connection element of the inner annular element reflects the fact that the inner annular element and the outer annular element are connected to each other by means of it. It forms a part of the inner annular element because the outer annular element is arranged, preferably by means of moulding-on (moulding-onto; for short, injection moulding-on can be called moulding-on, while injection moulding is at some places referred to as moulding; these abbreviations can be resolved by writing out the full term) around that, in which in turn there is formed a connection space portion that according to the above also provides a fitting in a form-closing manner (cf. that form-closing is brought about in accordance with the moulding-on, because the outer annular element - which is made later - will fit against the corresponding, involved configuration detail of the inner annular element).

[0051] The connection space portion of the outer annular element is a receiving space portion, because it is adapted for receiving the connection element of the inner annular element (it could also be termed a receiving, reception or adapter-for- reception connection space portion). Furthermore, in the finished product, i.e. , in the annular intermediate piece, in which the outer annular element is preferably moulded on the inner annular element, the connection element of the inner annular element is, from the beginning, received by the connection space portion of the outer annular element. The above-described aspects required of it (e.g. that the connection element protrudes into it) indicate that the connection space portion of the outer annular element (see also its definition, i.e. its potential relationship with the pin elements) is partially open, or in other words: is open at a part thereof, (this is also meant on that it is open at its portion facing the inner annular element, while this could also imply that the degree of this openness may be affected by the pin elements). The formulation “the outer annular element has a connection space portion” is used since the latter is preferably established due to the moulding-on (it could also be said that “it is formed”, because it is formed in such a manner).

[0052] The feature related to that the outer annular element encompasses the inner annular element can also be formulated as “it comprises an outer annular element arranged around the inner annular element” (see also: in the further features it is specified exactly what is required of the configuration details of the annular elements). It is noted that in the description above, i.e., in the definition for “encompassing” and “fitting in a form-closing manner into the connection space portion at its outer edge” the physical configuration of the annular intermediate piece is included. Preferably, the outer annular element is made by moulding-on such that it encompasses the inner annular element; in this case the fitting in a form-closing manner required above is established - in accordance with manufacturing of the outer annular element around the inner annular element preferably by injection moulding - in this manner.

[0053] The outer edge of the connection element of the inner annular element being farther from the annular central portion (for short, this can be called simply an outer edge, without relating it to the annular central portion) can be clearly identified in the embodiment illustrated in the figures (preferably, it is at this outer edge where for example ribs are arranged). The inside edge of the connection element is located at the annular central portion, i.e. , where it protrudes therefrom.

[0054] The outer edge of the connection element could also be termed an outer side, i.e., it is the side or portion that faces outward. It is essentially an outer portion, which is the portion located furthest from the annular central portion. In accordance also with the ribs (corrugations), the outer edge (side) can have a wavy (undulated) or other configuration. The outer edge may have such a portion of a certain extension (in Fig. 7, a vertical portion) that is aligned with the side of the annular central portion (i.e., for example - cf. Fig. 7 - both are vertical), but this is also not a requirement. In accordance with that, and also with the meaning of the terms outer edge being outer rim or outer periphery, by the formulation “fitting in a form-closing manner at the outer edge” it is meant that there is form-closing in the neighbourhood (environment) of the outer edge, i.e., at the outer portion of the connection element.

[0055] Using alternative terms, the connection element protruding from the annular central portion can also be called an (interconnecting) connection portion, interconnecting connection element, or a circumferential connection element according to the followings (these adjectives can also be attached to the connection space portion, but the nomenclature can also have asymmetry; the connection element is “outer circumferential” on the inner annular element, while the connection space portion is “inner circumferential” on the outer annular element). This connection element is arranged at the (outside) circumference of the annular central portion, also in accordance with that it protrudes therefrom in the direction of the outer ring. It is therefore arranged on the circumference, it can be formed circumferentially (like in the illustrated embodiment, wherein the connection space portion is also circumferential), but optionally it may also have interruptions along the circumference (because the outer annular element is preferably moulded on, it will conform to its configuration).

[0056] Form-closing in the connection space portion is required of the connection element at the portion which is the outer portion of the connection element (i.e. , on its outer edge), there preferably is also located a turned rim (see below). At these portions “moulding around” is present around the connection element (see also the description below related to the comparison of Figs. 14 and 15), however, nearer to the annular central portion of the inner annular element various other configurational details may appear in respect of the relationship of the inner annular element and the outer annular element.

[0057] In this region nearer to the annular central portion, protruding-in space-filler elements are preferably applied for the moulding-on process expediently utilised for making the outer annular element, which space-filler elements close off certain space parts from moulding-on (these are divided by the support elements 18 and terminal position elements 28), however, due to the moulding-around of the outer portion of the connection element, the pin element can be formed during the moulding-on process (both in case it extends all the way through and in case it only protrudes from one side).

[0058] Of course, this also affects what is called the connection space portion of the outer annular element. As this term is basically used to refer to the spatial region wherein the connection element of the inner annular element is fitted in a form-closing manner from all directions - see also further below - (that is, where it is not closed off by space-filler elements according to the preferred manufacturing, but where the moulding-around of the connection element is performed); thus, the connection space portion can be defined as extending, starting from the outside, i.e., the outside of the outer annular element, towards the inner annular element to - at a good approximation - the location, i.e., the circumference where a pin element - or typically a plurality of pin elements - are located (that is, to the circumference defined by the portions of the pin elements located furthest from the annular central portion, in the illustrated embodiment the pin elements are located on the same circumference; while it can also be said that the one or more pin elements affect the degree to which it is open towards the inner annular element), and the circumferential portion belonging to the one or more pin elements (which is determined by the thickness of the pin element) and the space portion extending therefrom towards the inner annular element is not included in said connection space portion.

[0059] If the connection space portion is defined in such a manner, fitting in a form-closing manner into the connection space portion can be made a requirement for the connection element (it is meant here for the entire connection space portion), i.e. , in such a case the requirement of fitting in a form-closing manner at the of outer edge of the connection element is taken to mean this. It is noted that the fitting in a formclosing manner to the material of the outer annular element may also continue inward, i.e., in the direction of the inner annular element, e.g. protruding to some extent into between the pin elements.

[0060] Furthermore, at the portion extending from the one or more pin elements towards the inner annular element the connection element is not located inside the connection space portion in the illustrated embodiment, but here will be such space portions around it that were closed off during the preferably applied moulding-on process, at which portion in the illustrated embodiment the connection element is bounded by the material of the outer annular element only at the support elements 18 and terminal position elements 28 (see also the description below related to the comparison of Figs. 14 and 15).

[0061] In relation to the pin element, it is noted that it protrudes into the connection element (i.e. penetrates, enters, gets into it) or it protrudes through the connection element, i.e., it can be said collectively that it at least protrudes into the connection element (i.e., it protrudes into or protrudes through it, in other words: at least protruding therein).

[0062] It is also noted that the pin element extends (substantially) perpendicularly to the plane that can be assigned to the annular elements, i.e., it penetrates into or through the connection element in this direction. The plane that can be assigned to the annular elements is a plane parallel to the plane that can be fitted to the annular element (the plane is laid onto it, i.e., onto the ring-like portion, disregarding the portions that change the ring-like shape). The pin elements preferably extend in a direction that is also (substantially) perpendicular to the radial directions pointing radially outward from the central portion (these radial directions pointing outward on the circumference also define the plane that can be assigned to the annular elements; cf. at the turned rim this is the radial direction defined by the annular element). The annular shape of the annular elements also defines a ring axis (which is perpendicular to the plane that can be assigned to them), around which the annular aspect is manifested. There is no rotational symmetry here, if there was, i.e., if the shape was a regular ring shape, then this axis would be the rotational axis. The pin elements extend (substantially) parallel to this ring axis (i.e. they are configured in this way). Because the pin elements are elongated, these assertions can also be applied to the longitudinal axis that can be assigned to them. Furthermore, the pin element is preferably located further inward with respect to the outer edge (cf. the above description where it has been detailed that the connection space portion can preferably also be delimited by the pin elements; this also refers to the one or more pin elements being located further inward).

[0063] In general, about the invention, thus, the above-described structural aspects are stipulated. In this case, the known annular intermediate piece can be replaced by the illustrated embodiment of the solution according to the invention, wherein inner and outer annular elements made of any material (preferably plastic) interlock with each other (the annular elements are preferably made of plastic); preferably they are injection-moulded on(to) each other. The illustrated embodiment differs from the known intermediate piece in its internal configuration (see additionally below the preferable considerations regarding the choice of materials), but at the same time such an intermediate piece can also be provided within the scope of the invention that differs from the prior art intermediate piece also in its outward shape.

[0064] This configuration provides that the annular elements of the annular intermediate piece according to the invention interlock well, providing a structure that is also resistant to the relative rotation.

[0065] Thus, such a configuration allows the material choice for each annular element, in which for example the aspects of cost and material availability can be considered also. As it is also touched upon elsewhere, a suitable material can be chosen for the outside (for example for connecting the gun), and a material for inside fulfilling its requirements, i.e. one that is sufficient for applying there (cf. the description above concerning the functional part).

[0066] An intermediate piece comprising such interlocking annular elements providing protection against their mutual rotation has not been found in the known approaches.

[0067] In some embodiments certain constraints are applied to materials for the inner annular element and the outer annular element. As it will be detailed below, the inner annular element is preferably made of recycled plastic, and the outer annular element may preferably contain a greater or lesser amount of non-recycled plastic. The invention is illustrated in several places applying these optional material specifications, emphasising that these are not compulsory to the invention, i.e., these are non-limiting.

[0068] In an embodiment, therefore, the inner annular element is made of recycled plastic, i.e. it is produced from it. As it will be detailed below, in a particularly preferable manner this allows us to provide a high recycled plastic ratio in the annular intermediate piece.

[0069] Recycled plastic is meant that - in addition to their recycled plastic content - it may also comprise contaminant, colouring material and other additive (in accordance with the concept of the term “recycled plastic” in the relevant field). These other materials typically do not have a share larger than 2 weight% (percent by weight), and to our present knowledge, in a recycled plastic material materials other than the primary material may not be present in an amount more than 5 weight%, or, in special cases, more than 10 weight%. For the advantages of applying an inner annular element made preferably of recycled plastic see also further below, for example in relation to environmental load.

[0070] Furthermore, the outer annular element is of preferably at least 20 weight% of nonrecycled plastic (in this case, therefore, this is the smaller portion, so the rest, i.e., even as much as 80 weight% can be recycled plastic in the outer annular element), particularly preferably at least 60 weight% of non-recycled plastic, i.e. , it is made from that (the remaining material is preferably recycled plastic; it can even be the same type of plastic as the material of the non-recycled portion, for example both can be of polypropylene).

[0071] More specifically, according to what has been set forth above, an outer annular element made substantially entirely of non-recycled plastic, i.e. made of more than 90 weight%, nearly 100 weight% of non-recycled plastic can be preferably applied in the invention (in such a case therefore the outer annular element is essentially free from recycled plastic, cf. also the discussion below). This is made (almost) entirely of original plastic that does not contain a recycled portion, because according to the present state of the field the appropriate quality for the outer annular element can be provided with large safety applying such a material.

[0072] Thus, preferably at least 20 weight% (or in other cases, more than that) of the outer annular element is such plastic (non-recycled plastic) which has not been used before (e.g. no other plastic objects were made of it earlier; in other words, it is original, newly produced, genuine, primary plastic, or to use another term: it is a not recycled plastic), which may also be complemented by recycled plastic. However, according to the above, preferably such an outer annular element can also be applied which is free from recycled plastic, or is substantially free from it. The latter is taken to mean that it comprises only a small amount of such material that is not newly produced (i.e. non-recycled), i.e., maximum 5 weight%, preferably maximum 2 weight%.

[0073] However, further research might reach that the outer annular element may contain a greater or lesser amount of recycled plastic while preserving the desired quality (see above: i.e. if the rest of the base material of the outer annular element is recycled plastic), thus, it can be applied for increasing the share of recycled plastic in the entirety of the annular intermediate piece. Accordingly, in the corresponding embodiments it is set as a requirement that the outer annular element is made of at least 20 weight% or at least 60 weight% of non-recycled plastic. The points made above regarding contaminant, colouring material and other additive are also to be considered in relation to the potential recycled plastic content of the outer annular element (or the optionally included cover). Furthermore, except for the contaminant, these considerations can also be applied to non-recycled plastic, as they are not present in a greater amount in the majority material of the non-recycled plastic than what was specified above in relation to the recycled plastic material.

[0074] The plastic applied in recycled or non-recycled form can be for example PP (polypropylene), PE (polyethylene), PA (polyamide). A recycled variant of this material can preferably be a so-called PCR plastic (Post-Consumer Recycled plastic).

[0075] Preferably, therefore, in an embodiment the outer, i.e. the portion arranged outside (outer annular element), which has a role with regard to certain functions (see for example the discussion below of mounting the gun on the intermediate piece), can be made to a greater or lesser extent of a non-recycled plastic, so, this outside-lying part can be formed in a - substantially or even entirely - identical manner (i.e., in the same shape and using the same material) as in the known intermediate piece. It can thereby be achieved to have no change in that how these functions are performed.

[0076] This configuration, i.e., wherein the outer annular element is made entirely of nonrecycled plastic - with the inner annular element being made of recycled plastic - passes the tests, and no change can be detected in the performance of other functions (for example when the intermediate piece is mounted on a container), either, with respect to the known intermediate piece. In our experience, this is not changed by a “substantially entirely” state.

[0077] There can also be differences in physical characteristics of recycled and nonrecycled plastics (for example, non-recycled plastics may have greater resilience), but, as it was set forth above, this does not cause a disadvantage in performing the functions. However, according to the recycled plastic content of the inner annular element (and optionally the cover), an intermediate piece with lower environmental impact can be obtained that can successfully meet the requirements stipulated in certain environmental regulations and directives. Advantages related to environmental impact can also be provided in case it is made a requirement that the material of the inner annular element is to be made of recycled plastic, but no constraint is applied to the material of the outer annular element. It can be an advantage that in case the annular element that preferably comprises (substantially) entirely (purely) non-recycled plastic is located outside and the annular element made of recycled plastic is located inside, then outside the stable quality of the plastic material can be ensured, while “inside” it is not necessary to ensure the stability of the material quality, i.e., the structure can tolerate relatively large quality fluctuations of the recycled plastic material (as the material included in the recycled plastic is collected, it may even contain a different material).

[0078] Further, as it has been set forth above, preferably the inner annular element and the outer annular element, respectively, contain the recycled and non-recycled variant of the same plastic (more particularly, it can be contemplated that the outer annular element is not made exclusively of the non-recycled variant, but the material of the non-recycled part can thus be determined in such a way in dependence of the material of the inner annular element made of recycled plastic), that is, the recycled and non-recycled plastic materials applied in the annular intermediate piece can be based on a plastic of identical material (material quality), quality, and type. Accordingly, in an example the recycled plastic preferably applied for the inner annular element can be recycled polypropylene, while the non-recycled plastic material of the outer annular element can be non-recycled (original) polypropylene. However, in contrast to the above, it can also be contemplated that the outer and inner annular elements are made of different materials - as it has already been mentioned, flexibility in this regard is an important advantage of the invention - e.g., in a further example, non-recycled polypropylene can be applied in the outer annular element and recycled polyethylene can be applied in the inner annular element.

[0079] In these embodiments, therefore, constraint is also applied to the material utilised in the above-defined structural configuration, i.e., to the characteristics of the material - i.e., recycled and non-recycled - of which one and / or the other of the annular elements interlocking in the manner described above (see also the figures and further descriptions) is made partially or in its / their entirety (typically, both are made of plastic; this term can be used without further constraint for referring to the material of these components).

[0080] In relation to the at least one pin element, it is noted that, according to a configuration option, and thus in the illustrated embodiment, the at least one pin element protrudes through the connection element. Pin elements 24 configured in such a manner are also shown in Fig. 23. In case the pin element protrudes through the connection element, it is preferably connected to the outer annular element at both of its ends, as shown in the figures in the illustrated embodiment.

[0081] Rotation is prevented in a more preferable manner, also in accordance with their preferred manufacturing by injection moulding by the plurality of pin elements that are expediently arranged at uniform angular intervals along the circumference and protrude through the connection element, but rotation can also be prevented if the pin elements only protrude into the connection element of the inner annular element. In this case, the tongues (pin elements) of the outer annular element are in effect encompassed by the material of the inner annular element, which provides the engagement (joint) between the annular elements.

[0082] The inner annular element made of recycled plastic that is preferably applied according to the invention helps during assembly the appropriate positioning of the annular intermediate piece relative to the valve of the container (e.g. can) that is connected to the annular intermediate piece in an application of it (see also in the discussion on a narrowing portion 21 ). With the outer annular element made preferably of non-recycled plastic (i.e. , together with the inner annular element, the two forming an integral unit in the completed state), the annular intermediate piece passes the tests, that is, withstands the appropriate torque, can be appropriately (without being broken or cracked) mounted on the container (e.g. a can), and also passes the tensioning test.

[0083] Certain embodiments of the invention relate to a method for manufacturing an embodiment of the annular intermediate piece according to the invention. Therefore, preferably this method is applied for manufacturing the annular intermediate piece according to the invention. In the course of the method (i.e., in the course of the manufacturing method) according to the invention

[0084] - the inner annular element is manufactured (produced) by injection moulding in a first injection moulding space portion (this is an injection moulding space portion where shape can be given to the inner annular element; injection moulding is performed in the injection moulding space portion of an injection moulding tool applied as a manufacturing tool, see also below), and - the outer annular element is manufactured by injection moulding around the inner annular element (this is the so-called “moulding-on with injection moulding”) in a second injection moulding space portion (for example, the completed, i.e., solidified inner annular element is placed / inserted into this, but it may also be that the second injection moulding space portion is formed around the inner annular element, see below; the second injection moulding space portion is also an injection moulding space portion adapted to form an appropriate shape - in this case, it is applied for forming the outer annular element - it is obviously such a space portion where the inner annular element can be arranged appropriately) such that the connection element fits in a form-closing manner into the connection space portion at its outer edge being farther from the annular central portion, and the at least one pin element protrudes into the connection element or protrudes through the connection element.

[0085] The first and second injection moulding space portions may be located in separate injection moulding tools (in such a case, the inner annular element must be moved from one of the space portions to the other). It is however also feasible to configure the first and the second injection moulding space portions within the same injection moulding tool, such that it is transformed between forming the inner and outer annular elements (by moving various space-filler elements, see also other parts of the description discussing this subject). Because these tools are typically large, it is not necessary to invest in a new tool in case moulding-on is performed in another tool. To be able to form the first and second injection moulding space portions within a single tool, in some cases it may be necessary to develop a new moulding tool.

[0086] In such a manufacturing, the two components (i.e., the inner and outer annular elements, more precisely their base materials) are not materially unified (or are unified only to a small extent) during the manufacturing of the outer annular element. The outer annular element is injection moulded on the completed (solidified) inner annular element.

[0087] Fig. 1 shows an embodiment of the invention, i.e., an annular intermediate piece 10. In the illustrated embodiment, the annular intermediate piece 10 has a cover 14 (lid; cap). Also, in accordance with the fact that preferably the cover 14 is also made from recycled plastic, this can be considered a separate embodiment from the annular intermediate piece that has the same configuration as the annular intermediate piece comprising a cover but does not have a cover. Regarding the parts other than the cover, basically a single kind of embodiment is illustrated.

[0088] The illustrated embodiment is therefore such an embodiment wherein the annular intermediate piece has a cover (preferably made of recycled plastic) adapted to be arranged on a second annular side thereof (see a second annular side 33 indicated in Fig. 20) formed opposite a first annular side (see a first annular side 31 indicated in Fig. 20, in other words, an annular end side) configured for mounting on the container.

[0089] The cover is a part of the annular intermediate piece (collectively referred to as an annular intermediate piece provided with a cover) that is intended to be removed therefrom during use, i.e. , when a gun is connected to the intermediate piece, which connection to the in-use functional (main) portion of the annular intermediate piece can be made with the help of snap-in flanges 11 and 23 (see Fig. 5).

[0090] The cover 14 has an opening tab 15, with the help of which it can be removed from the snap-in flange 23. For example, the preferably circumferentially formed snap-in flange 23 can be seen in Fig. 2, and the connection of the cover 14 to the snap-in flange 23 can be observed in the sectional drawing of Fig. 5.

[0091] As illustrated in Fig. 1 , a thread 16 is formed along the outside circumference of the outer annular element 20. The winding shape of the thread 16 can be observed e.g. in Figs. 2 and 3. The thread 16 is applied for mounting the gun basket on the annular intermediate piece 10, i.e., thereby preferably to the container connection portion of the container (e.g. to an end edge of a can), on which the annular intermediate piece 10 can be mounted. As shown in Fig. 1 , in the illustrated embodiment the annular intermediate piece 10 has four tabs 12. These tabs 12 help mounting / screwing the annular intermediate piece 10 on the container, providing grip points along the circumference of the annular intermediate piece 10.

[0092] As the cover 14 is shown lifted (removed) from the other components of the annular intermediate piece 10, in Fig. 2 the upper rim of the inner annular element 30 is also visible in addition to the outer annular element 20 (the inner annular element 30 will be illustrated below in various figures, e.g. it will be illustrated individually in Figs. 6A-10). Support elements 18 (support ribs; four of them are arranged circumferentially; one of them starts from a material filled-up member 22, but it extends to the same protrusion depth as the others) are shown in Fig. 2 that have a role described as follows.

[0093] In this embodiment, the cover 14 is connected to a snap-in flange 23 formed on the outer annular element 20 with a snap-in joint, i.e., the cover 14 must be pushed through this snap-in flange 23. In such a case, a lateral tensioning force arises at the snap-in flange 23 due to the overlap (the snap-in flange 23 is located on a necklike portion that is arranged in the top portion - according to the figure - of the outer annular element 20, see e.g. Figs. 5, 11 , and 12) with the support elements 18 counteracting, reinforcing. A material filled-up member 22 is shown in Fig. 2. This indicates the location where the material is filled, the product is injected during the preferably applied injection moulding process, i.e., this is the location where the injection moulding process is started (i.e., at the upper, visible portion of this).

[0094] Fig. 3 shows the arrangement according to Fig. 1 in top view. Fig. 3 shows a section plane C-C and the direction from where the section C-C can be seen from in Fig. 5. Like in Figs. 1 and 2, an injection point 27 can be seen on the cover 14 also in Fig. 3 (in this embodiment, the material of the cover 14 is injection moulded through this point; the injection point may also be located elsewhere), the figures also showing a first through opening 29 (cf. these with Fig. 5 showing that the injection point 27 forms an indentation in the cover 14, and the through opening 29 penetrating it). Aligned with these parts a second through opening 13 on the tab 12 is shown in Fig. 3 that is adapted for example for hooking another component.

[0095] Fig. 4 shows the arrangement according to Fig. 1 in side view. There can be seen the winding configuration of the thread 16.

[0096] In the sectional drawing of Fig. 5 various other details can be observed. Of the figures we have referred to so far, the inner annular element 30 and the outer annular element 20 can be best differentiated from each other in this figure (the parts of the section corresponding to them have different hatch directions, the different hatch directions also illustrating the preferably different material selection). A container connection space portion 17 (container-connection space portion) wedged from below between the inner annular element 30 and the outer annular element 20 can be seen at the bottom of Fig. 5 (in its connected state, the container connection portion, for example the terminal edge of the bottle, protrudes into this region, see Fig. 27 and also see below for an exemplary configuration thereof).

[0097] In the relation of the section C-C, Fig. 5 also shows how the connection element 32 of the inner annular element 30 is received in the outer annular element 20 (in connection with this, reference is made to Figs. 14 and 15, and to Figs. 22 and 23, in which this connection can be observed in other sectional views).

[0098] As shown also in Fig. 5, in this embodiment the connection element 32 has a turned rim projecting out transversely with respect to a radial direction and a tangential direction determined by the inner annular element 30 (in the embodiment according to Fig. 5, a turned rim 34; in the illustrated embodiment a radial direction 43 and a tangential direction 45 is depicted in Fig. 8). The turned rim 34 extends transversely (i.e. , in this case, to a very good approximation, perpendicular) to the radial direction defined by the inner annular element 30 (cf. Figs. 6A-10 illustrating the inner annular element 30; in the top view figure the radial direction 43 can be identified with a radial direction extending from the circle located at the centre of the circle-like structure, and the tangential direction 45 is perpendicular to this radial direction 43 in the plane according to Fig. 8).

[0099] The statement “projecting out transversely with respect to the radial direction and the tangential direction” holds true along the circumference, i.e., the radial and tangential directions can be defined at the points of the circumference. This “transversal” characteristics specifies the protrusion direction; for example, the ribs 39 or other implementations of the rotation-preventing configuration at the outer edge can also be added to the turned rim (which is preferably located on the outer edge). The downward-extending portion / edge, i.e., the turned rim 34 located on the protruding portion (i.e., the connection element 32) of the inner annular element 30 helps and improves the mutual engagement of the two components (annular elements).

[0100] Fig. 5 also shows the container connection space portion 17, which in section C-C is bordered at both sides of the annular central portion 36 (i.e. at the top as shown by the figure) by a terminal position element 28 (in connection with this, reference is made to Figs. 11 , 14, and 15, and to Figs. 22 and 23, with the help of which it can be understood how this space portion is formed), that is, it limits the height to which the intermediate piece can be pushed on the container connection portion (i.e., preferably on the terminal edge of a can, see also Fig. 27).

[0101] Preferably, therefore, one or more terminal position elements (end position elements) protrudes from the outer annular element towards the inner annular element to limit a protrusion of the container connection portion into the container (reaching into it, extension into it) connection space portion when being mounted on a container.

[0102] The terminal position elements having such function expediently have a flat configuration (see the terminal position element 28). The container connection portion can simply be called the connection portion of the container. It is preferable that the terminal position element starts from the outer annular element (it is made of the material thereof), because in an embodiment the latter contains a greater or lesser amount of non-recycled plastic, while the inner annular element can be made of recycled plastic. This configuration is more preferable than the one wherein it is started from the inner annular element also from the aspects of the material and the structure (in which case it could behave more “loosely”).

[0103] Fig. 5 also shows a circumferential snap-in flange 19 located at the entrance to the container connection space portion 17, which plays a role in mounting the intermediate piece on a container (e.g. a can); the container connection portion “snaps through” this (see Fig. 27).

[0104] Therefore, in the illustrated embodiment it also holds true that, at a first annular side (see the first annular side 31 shown in Fig. 20) thereof configured for mounting on the container, a container connection space portion (see the container connection space portion 17 in Fig. 5) protruding into between the inner annular element and the outer annular element is formed. It is preferable that in this embodiment the container connection space portion - i.e., in the case it is connected, the container - extends between the two annular elements. The container connection space portion therefore protrudes (extends) from one side into between the annular elements in accordance with the interconnected configuration of the annular elements (this container connection space portion approaches the connection established by the connection space portion and the connection element, see also the description of the connection elsewhere).

[0105] The container connection space portion can also be configured differently (expediently at the first annular side, or opening therefrom, like the container connection space portion 17), for example such that it does not extend into between the inner and outer annular elements. Furthermore, it can be contemplated that the connection of the annular intermediate piece to the container can be implemented differently than with the help of the container connection space portion.

[0106] In Fig. 5 there is also shown an annular central portion 36 of the inner annular element 30 form which the connection element 32 protrudes (for the shape of the annular central portion and the connection element 32 see also Figs. 6A, 6B, and 7). The annular central portion 36 contributes to providing that the annular intermediate piece 10 is appropriately tightened onto the container connection portion (e.g., onto the terminal edge of a can, cf. Fig. 27).

[0107] A narrowing portion 21 connects (is joined) to the annular central portion 36 at the bottom as shown in Fig. 5. When the annular intermediate piece 10 is mounted on the container (cf. Fig. 27 showing the container implemented as a can 50), typically the valve has already been connected thereto, as it can be understood from a comparison with Fig. 27. Thus, when the annular intermediate piece 10 to be mounted on the can is dropped / placed on the appropriate end portion of the can (i.e. , where a valve disc is fitted into it, cf. Fig. 27), then, provided that the placement is correct, the valve “positions” the annular intermediate piece 10 thanks to the narrowing portion 21.

[0108] Also referring to Fig. 5, the following are noted. Thanks to the preferred manufacturing obtained by the moulding-on, the advantageous feature that the outer and inner annular elements appropriately interlock can be achieved. This is basically aided by the (at least one) pin element 24 (see in further figures, e.g. in Fig. 11 ), however, it can also be facilitated with the help of the turned rim 34, a recess 35 running beside it, and the material of the outer annular element entering into it, but, as illustrated also in Fig. 5, it can also be aided by the help of various other configurational details.

[0109] Accordingly, the outer annular element is preferably made by moulding-on such that the mutual engagement of the of the annular elements is helped by interlocking or mutually engaging portions - for short, engagement portions (cling / clinging portions). In other words, in the illustrated embodiment the outer annular element is made by moulding it on the inner annular element (this definition is meant to imply the consequences described herein) and further comprises a first additional engagement portion and a second additional engagement portion formed, respectively, on the outer annular element and on the inner annular element for the mutual engagement thereof (i.e., “additional” in the sense of being arranged in addition to the pin element being a first engagement portion arranged on the outer annular element). These are arranged such that the connection element is firmly supported by the portions of the outer annular element in contact with it.

[0110] The outer annular element preferably tightly encompasses the inner annular element (also, a fitting in a form-closing manner is a requirement at the outer edge of the connection element of the inner annular element) and, as it can be seen in Fig. 5, mutual engagement is also helped - in addition to the above-mentioned configuration features related to the turned rim 34 and, of course, and the pin elements 24 (and openings 38 filled up by them) - by the arrangement of the support elements 18 (cf. the description of the arrangement of these also in relation to other drawings) which engage the recess 37 denoted in Fig. 6A. In the case of each of these configurational details there can be identified first and second engagement portions formed, respectively, on the outer and inner annular elements (the pin elements 24 and openings 38 are “basic” engagement portions, and the others are additional engagement portions). That these elements are able to help the mutual engagement of the annular elements is a result of the preferably applied moulding- on manufacturing process (otherwise, it would not be possible to insert these configuration features into each other like this).

[0111] Like in Figs. 1 , 3, and 4, in Fig. 5 the cover 14 is connected to the annular intermediate piece 10. Due to the sectional depiction, there can be seen such a state of the second (inward-turned) snap-in flange 11 of the cover 14 in which it has already “snapped through” the first snap-in flange 23.

[0112] A repeated reference is made here to the above-mentioned tests, where, applying non-recycled and recycled plastic in the annular elements according to the illustrated configuration - emphasising the manner of mutual engagement of the inner and outer annular elements - we have found that the intermediate piece has passed the tests, i.e. , it was not damaged when being mounted on a container (e.g. on a can) or dismounted therefrom, and it is sufficiently tightened on the can. Therefore, the annular elements, or the portions thereof encompassing the container connection space portion (see the container connection space portion 17 in Fig. 5) are fitted together sufficiently tightly.

[0113] In a non-limiting example of the assembly illustrated in Figs. 1 -5, i.e., of the annular intermediate piece 10 together with the cover 14 (for depictions of the components, see also the other figures), a dimensioning identical to a widely applied dimensioning of the known intermediate piece mentioned in the introduction is applied (as it has been already mentioned, the outward geometry, i.e., the shape of the known intermediate piece is identical to that of the illustrated embodiment, its internal structure and material choice are however different). In this example, the annular intermediate piece 10 has the following characteristic dimensions, referring to Figs. 3 and 5 (other dimensions according to the figures may be deducted from the scale drawings):

[0114] - based on the top view shown in Fig. 3, in accordance with the oppositely located tabs 12, the width of the annular intermediate piece 10 is 60 mm

[0115] - referring also to Fig. 5 o at the thread 16 (i.e., at its outside portion) the diameter of the outer annular element 20 is 39 mm, o the total height from the bottom of the tabs 12 to the top portion of the snap- in flange 23 without the cover 14 is 17 mm, o the inner diameter of the annular central portion 36 of the inner annular element 30 at the upper portion (i.e., not at the narrowing portion 21 ) is 20 mm, and the thickness of the annular central portion 36 beside the container connection space portion 17 (also not at the narrowing portion 21 ) is 2.6 mm. The non-limiting example having the dimensions specified above is implemented applying the following mass shares and materials:

[0116] - cover 14 (recycled polyethylene): 1.01 g;

[0117] - inner annular element 30 (recycled polypropylene): 3.62 g; and

[0118] - outer annular element 20 (original, non-recycled polypropylene): 5.45 g.

[0119] As far as the materials are concerned, in the illustrative example these components are made in their entirety of the given recycled and non-recycled plastic materials.

[0120] Accordingly, in this example the share of recycled plastic is approximately 46%. The mass shares of this example also illustrate well the mass shares of a differently dimensioned, cap-equipped embodiment of the annular intermediate piece.

[0121] The dimensions included above are therefore of an illustrative, non-limiting example, the dimensions and masses also depend on the material of which the annular intermediate piece is made. The tests were performed on an annular intermediate piece having the parameters specified above; but expectedly the tests can also be passed with certain parameters having been modified. The configuration according to the invention can be applied in a wide size range for intermediate pieces adapted for being mounted on a container (preferably, a can).

[0122] In sum, therefore, in an embodiment of the invention - i.e. , which has passed the tests detailed above: did not crack and also met the torque requirements - such a configuration was applied wherein an outer functional part - i.e., an outer annular element - is made of original (i.e., non-recycled) material, while an inner annular element and a cap applicable with the annular intermediate piece are made of recycled material.

[0123] Thereby, while preserving the original geometry and ensuring the prior mechanical properties, the invention can be applied in an extremely preferable manner to meet various directives, for example Ell directives.

[0124] Figs. 6A-10 show the inner annular element 30. The annular intermediate piece according to the invention is preferably produced by first making the inner annular element 30, preferably in a first injection moulding space portion of an injection moulding tool, and then - for example by conveying it to a second injection moulding tool, but it can also be left in the original tool, see above - making around it the outer annular element 20 by injection moulding it on the inner annular element 30, i.e., the outer annular element 20 is injection moulded around the inner annular element 30.

[0125] This is important to note that in relation to Figs. 6A-10 illustrating the inner annular element 30 and Figs. 11 -18 illustrating the outer annular element 20, because, accordingly, the outer annular element 20 shown in Figs. 11 -18 will not be available separately in the course of the preferably applied manufacturing method, it can however be depicted in drawings by separating the various parts from each other.

[0126] The manner of the preferably applied manufacturing also results in that the shape of the inner annular element 30 will be dominant (determining), i.e., the shape of the outer annular element 20 conforms to the configuration details of that in those regions where these are in contact. This appears basically at those parts where the outer annular element 20 and the inner annular element 30 interlock with each other at the connection element 32 (see Figs. 22 and 23 illustrating their engagement in various sections). This being their principal region of contact results from the fact that according to the preferred manufacturing manner the outer annular element 20 is moulded around the connection element 32, and the pin elements 24 protrude through the openings 38 formed in the inner annular element 30 thanks to the moulding-on process.

[0127] In Fig. 6A the inner annular element 30 is illustrated in a tilted top view, while Fig. 6B shows it in a tilted underside view. In Figs. 6A-6B the connection element 32 is shown arranged around the annular central portion 36, as well as openings 38 (in the illustrated embodiment, eight) formed around the annular central portion 36. In Fig. 6B, in turn, thanks to the underside view the openings 38 can be seen from below, i.e., by comparing Figs. 6A-6B it can be clearly discerned that they are through openings (these have a “through character”). In Fig. 6B, the connection element 32 can also be seen from below, together with the turned rim 34 thereof, with the ribs 39 giving undulating shape being formed at the portion of the turned rim located at the outside circumference, i.e., at this portion of the connection element 32 (see also below). The “turned” nature of the turned rim 34 can be understood contemplating Fig. 6B and Fig. 5, and also Figs. 9, and 10. In this embodiment, therefore, the opening 38 are through openings (holes) that are configured for receiving pin elements 24 (see also the discussion below in relation to their mode of arrangement). When the outer annular element 20 is moulded around the inner annular element 30, the openings 38 form a flow-through channel for the injection moulding material, so the pin elements 24 protruding (extending) through the openings 38, being on the connection element 32 can be formed, i.e., the through openings 38 are filled during the manufacturing of the outer annular element 20.

[0128] In an embodiment the connection element has an outer edge rotation-preventing configuration on its outer edge for preventing (hindering, blocking) rotation of the inner annular element and the outer annular element relative to each other (in accordance with the above, from that it is on the outer edge of the connection element it follows that it fits in a form-fitting manner into the connection space portion). This is therefore such a rotation-preventing configuration (it could also be called a rotation-preventing arrangement in the sense that it has corresponding configuration features on both the inner and outer annular elements) in the annular intermediate piece that is arranged at the outer edge of the connection element thereof.

[0129] The outer edge rotation-preventing configuration can be realised at the outer edge (outside circumference) of the connection element in a number of ways, optionally even by applying a single protruding element that protrudes from the inner annular element or from the outer annular element at the outer edge of the connection element of the inner annular element and is received by the other annular element in a form-closing manner. Being a “configuration”, it can freely be realised that in which annular element it is a projection and in which a recess, and it can also be complex in this regard, like the ribs 39.

[0130] As shown in Figs. 6A-7, more particularly in the illustrated embodiment, the outer edge rotation-preventing configuration is configured on the outer edge of the connection element 32 with ribs 39 arranged transversely to a radial direction and a tangential direction determined by the inner annular element 30, and protruding out from the connection element 32 in the radial direction (in the illustrated embodiment the radial direction 43 and the tangential direction 45 is shown in Fig. 8). As illustrated also in Figs. 6A-7, preferably a plurality of ribs 39 are formed along the circumference, uniformly separated from one another. The outer edge rotationpreventing configuration is applied in addition to the application of the openings 38 and the pin elements 24 extending therethrough, so it is preferable to uniformly distribute the rotation-preventing elements (in this case, ribs 39, a different, preferably also form-closing shaped design (configuration) can also be applied) on the outer edge.

[0131] The (preferably circumferential) arrangement of the ribs 39 somewhat decreases the load on the pin elements 24, i.e., this configuration of the structure is more resistant to rotation compared to the configuration wherein only the pin elements 24 are included. Accordingly, the optionally applied ribbing / shaped design of the outside circumference of the protruding portion of the inner annular element 30 (i.e., the connection element 32 thereof) also helps, improves the interlocking of the two components.

[0132] Fig. 7 shows the inner annular element 30 in side view. As can also be observed in Fig. 7 (see also e.g. Fig. 5), the portions of the annular central portion 36 (having a cylindrical-like shape with the connection element 32 protruding from it and the narrowing portion 21 being formed on it) located at both sides of (in the figure: above and below) the connection element 32 have slightly different diameters (cf. Figs. 9 and 10).

[0133] In Fig. 8, the inner annular element 30 is shown in a top view, with denoting where the section planes C-C and E-E going through it (the section planes are oriented perpendicular to the plane of the figures, both planes crossing the axis of rotation of the annular central portion 36 of the inner annular element 30; according to the drawings, an axis of rotation can be assigned to the annular central portion 36 in accordance with its annular central character), the drawings also showing the viewing direction of the sectional views shown in Figs. 9 and 10 corresponding thereto. Section plane C-C is arranged to not cross any opening 38, and section plane D-D crosses two openings 38.

[0134] In Fig. 8, the different parts can be separated by the help of the hatchings and the terminations of the lines that correspond to the reference signs. The narrowing portion 21 can be seen through the annular central portion 30 in top view, and the end portion of the annular central portion 36 is also indicated.

[0135] Fig. 9 thus shows a section that does not cross any of the openings 38. In the sectional view, the configuration details of the connection element 32 can be well observed (in this figure and in Fig. 10 as well).

[0136] As shown in Fig. 9, the turned rim 34 hangs out in one direction from the connection element 32 (i.e. , a first circumferential recess 35 is formed therein at the bottom as seen in Fig. 9 such that the turned rim 34 protrudes from it). At the side of the connection element 32 lying opposite the turned rim 34 (i.e., at the top in Fig. 7) a second circumferential recess 37 can be seen (cf. also Fig. 6A). These configuration details also help the mutual engagement of the inner annular element 30 and the outer annular element 20. As shown in Figs. 9 and 10, the part (region) extending from the recess 35 towards the annular central portion 36 in the turned rim 34 is recessed slightly less than the recess 35 itself. This is, however, not relevant in respect of the turned rim 34 (the recess 35 and the turned rim 34 curving backwards behind it can be seen according to the sectional drawings of Figs. 9 and 10).

[0137] The turned rim can also be called a hanging rim, which is “turned” (or is hanging or protruding) with respect to the radial-direction configuration of the connection element 32 - of course not in a tangential direction but perpendicular to both directions, i.e., protruding sideways from it - such that it can better engage the material that is preferably moulded around it. The turned rim could turn in both the directions of the first annular side and the second annular side (cf. Fig. 20; in the illustrated embodiment it turns towards the first annular side 31 ).

[0138] These configuration details (also the recesses 35 and 37) can also be observed in Fig. 10. The section corresponding to Fig. 10 crosses the openings 38, thus, these can be seen in this figure. The opening 38 is therefore a through opening, i.e., essentially a straight bore that has an axis parallel to the axis of the annular central portion 36, with the above-mentioned recesses 35 and 37 extending into it.

[0139] In Fig. 11 the outer annular element 20 is shown in a spatial drawing. As it was mentioned above, this is preferably injection moulded on(to) the inner annular element 30, so it is not available separately but only together with the inner annular element 30. It is however expedient to present the configuration details of this such that it is removed from the inner annular element 30.

[0140] Accordingly, the pin elements 24 can be observed in Fig. 11 (see also other figures of the outer annular element 20). During the injection moulding of the outer annular element 20 these pass through the openings 38 (cf. Fig. 15: because these are integrally connected to other portions of the outer annular element 20, these cannot be “pulled out” from the through openings 38). In Fig. 11 there can also be seen the support elements 18 which in this view are not obstructed from view by the inner annular element 30.

[0141] Fig. 11 also shows the terminal position elements 28 (ribs, terminal position ribs) that abut on (sit on) the container connection portion (e.g. on the end rim of a can) when the intermediate piece is connected to a container (e.g. a can), i.e. - as it has been touched above - these preferably limit the push-on height. As illustrated in Fig. 11 , these are located only at a few locations of the circumference (four locations in this implementation, cf. Fig. 18), that is, the position of the container connection portion (e.g., end rim of a can) relative to the annular intermediate piece 10 will be determined by these few (abutment) points.

[0142] It is noted that the terminal position elements 28 contact the inner annular element 30 only with their inward-protruding edges. Disregarding these edges, therefore, their shape is preferably defined not by the inner annular element 30 but the second injection moulding space portion (the first injection moulding space portion corresponds to the inner annular element 30) that is applied during the injection moulding process of the outer annular element 20 (in this second injection moulding space portion, the inner annular element 30 is arranged during the injection moulding of the outer annular element 20 as a kind of volume restriction element).

[0143] Fig. 12 shows the outer annular element 20 in a side view, with the snap-in flange 23 on it (cf. Fig. 4 also showing the cover; in Fig. 12 the cover 14 has been removed).

[0144] In Fig. 13 the outer annular element 20 is shown in a top view. The arrangement of the pin elements 24 relative to the support elements 18 can be seen in this, because in this view the pin elements 24 protrude from under the inside rim of the outer annular element 20. Fig. 13 gives the location of the section planes C-C and D-D, and the direction of the sections shown in Figs. 14 and 15.

[0145] Accordingly, Fig. 14 shows a head-on section of the outer annular element 20 such that it does not embrace (contain) the inner annular element 30. This depiction without the inner annular element 30 has already been mentioned above; however, attention is drawn to the part of the figure where it is the connection element 32 of the inner annular element 30 that is “missing”. This is a connection space portion 42 (may be called a cavity) that in the preferred production method obtains its shape during moulding on the inner annular element 30 (i.e. , the connection space portion 42 is open at the direction where the connection element 32 is joined thereto). Accordingly, in the connection space portion 42 there can be seen the imprints of the ribs 39 (in accordance with the ribs 39 being adapted for improving form-closing between the inner annular element 30 and the outer annular element 20). In addition to that, the shape of the connection space portion 42 and the portion available for the turned rim 34 can also be observed.

[0146] Fig. 14 shows the support elements 18 and the terminal position elements 28 - in accordance with the fact that the section plane C-C crosses them -, the sectional drawing also shows - in the middle - those located afront. In line with the above preferred approach, it can also be said that the pin elements 24 also protrude in front of the connection space portion 42.

[0147] In contrast to Fig. 14, section D-D of in Fig. 15 crosses the pin elements 24. Accordingly, in Fig. 15 it is shown how the intersected pin elements 24 - upper and lower according to Fig. 15 - are connected to other portions of the outer annular element 20. Thus, in this section these “close off” a small portion of the connection space portion 42, i.e., these will “grab” the connection element 32 inserted into the connection space portion 42 through this portion thereof.

[0148] In Fig. 15 there can also be seen further pin elements 24 (three of them according to the section) that are preferably located in front of the connection space portion 42, as well as two support elements 18 and two terminal position elements 28. Fig. 15 also clearly shows the circumferential snap-in flange 19. By comparing Figs. 14 and 15, the following can also be established (also cf. Fig. 17). As due to the applied sectional depiction we can “look into” the connection space portion 42, it can be investigated how the connection element 32 inserted into connection space portion 42 will be encompassed by the material of the outer annular element 20 at the terminal position element 28 (Fig. 14) and at the pin element 24 (Fig. 15).

[0149] However, precisely because the connection space portion 42 is not filled - i.e. , with the connection element 32 - in these figures, it can be seen in the figures that material gets - at the terminal position elements 28 and the pin elements 24 and also along the circumference between them - into a first circumferential recess 35 (see in Fig. 9 denoted on the inner annular element 30) formed in the inner annular element 30 to produce the turned rim 34 thereof (see the “step” located towards the middle of the outer annular element 20 from the portion of the connection space portion 42 established for the turned rim 34 - the section of a circumferential portion 44 constituting it can be seen in Fig. 17, and it is also indicated in Fig. 15 - which will be received in the first circumferential recess 35 of the inner annular element 30 if the inner annular element 30 is arranged in the connection space portion 42).

[0150] Accordingly, in the completed annular intermediate piece 10 the material of the outer annular element 20 encompasses the connection element 32 preferably not only at the top (i.e., towards the second annular side 33, see in Fig. 20) and along the outside circumference, but essentially also at the bottom (i.e., towards the first annular side 31 , see Fig. 20) at the portions located outward from the pin elements 24 in the outer annular element 20. (i.e. contacts it; cf. the discussion above related to the connection space portion). This is supported also by Figs. 22 and 23; it is also worth having a closer look at Figs. 14 and 15 in comparison.

[0151] Like in Fig. 12, in Fig. 16, the outer annular element 20 is shown in side view, however in Fig. 16 the position of section plane E-E is indicated together with the direction of the section in the corresponding sectional Fig. 17.

[0152] Comparing Fig. 17 with Fig. 15, it can be observed that the section plane E-E is located at such a height in the outer annular element 20 where the bottom portion of the pin element 24 (according to Fig. 15) is connected to further portions of the outer annular element 20. Accordingly, in Fig. 17 there can be seen the projecting portions of the pin elements 24, also in accordance with the feature that they protrude from a circumferential portion 44. The circumferential portion 44 has identical hatching as the portion of the outer annular element 20 located outward relative to it, because both are parts of the outer annular element 20, i.e. , they are made of the material thereof (the identically hatched outer portion has variable thickness conforming to the thread 16 of the outer annular element 20). The connection space portion 42 (of which the portion indicated in Fig. 17 corresponds to the portion where the turned rim 34 is located) can be observed between the two identically hatched portions.

[0153] Fig. 18 shows the outer annular element 20 in a bottom view. Accordingly, there can be seen the terminal position elements 28 and the pin elements 24 protruding from the material of the outer annular element 20 (and protruding into the space portion encompassed by the outer annular element 20).

[0154] In Fig. 19 the annular intermediate piece 10 is shown in a figure similar to Fig. 2, but with the cover 14 being removed. In Fig. 20, the annular intermediate piece 10 is shown in a side view, but this illustration is as if the outer annular element 20 was shown.

[0155] In Fig. 21 the annular intermediate piece 10 is shown in top view. Accordingly, the outer annular element 20 and the inner annular element 30 can be observed in the figure. In addition to that, the support elements 18 protruding from the outer annular element 20 around the inner annular element 30 can also be seen (they provide support from the outside to the annular central portion 36 of the inner annular element 30). The pin elements 24 can also be seen.

[0156] Fig. 21 shows the location of the section planes C-C and D-D, and illustrates the direction of the sections corresponding, respectively, to Fig. 22 and Fig. 23.

[0157] In Figs. 22 and 23, therefore, the annular intermediate piece 10 can be seen in two different sectional views. The locations of the sections are identical to the locations applied in Figs. 14 and 15, but here the inner annular element 30 is also arranged. Accordingly, the section shown in Fig. 22 crosses two support elements 18, and the section of Fig. 23 crosses two pin elements 24.

[0158] Thanks to the different hatching of the outer annular element 20 and the inner annular element 30 these can be differentiated from each other. In Fig. 22, respective continuous regions correspond to these, so differentiation between them is obvious. In Fig. 23 - as this section crosses the pin elements 24 - the hatching of the inner annular element 30 helps the identification of the portions that, although they belong to it, are “separated” from the inner annular element in this sectional view by the pin element 24 (this is, of course, continuous, only appear separated in this view). In Fig. 23, the connection element 32 is marked precisely at the “separated” portion.

[0159] In Fig. 24, section plane E-E is indicated with respect to the annular intermediate piece 10, and also the direction of the section shown in Fig. 25 corresponding to the section. The section of Fig. 25 is taken at the same height as that of Fig. 17, however, in this case the inner annular element 30 is also arranged. Accordingly, Fig. 25 also shows portions of the inner annular element 30; the annular central portion 36, shown here in a sectional view, is marked inside the circumferential portion 44.

[0160] In accordance with the section, in Fig. 25 certain portions of the connection element 32 are shown around the annular central portion 36, while other portions thereof (these latter being indicated by the reference numeral corresponding to the connection element 32) around the circumferential portion 44, outside of it (portions belonging together can be clearly identified by their hatching direction, i.e., the circumferential portion 44 belongs to the outer annular element 20).

[0161] In accordance with the section of Fig. 25, the outer circumference of the connection element 32 belonging to the inner annular element 30 and the corresponding portion of the outer annular element 20 can also be observed (see ribs 39 of the connection element 32 and ribs 41 belonging to the outer annular element 20; the latter are also located along a circumference, but for the sake of clarity only one of them is denoted). In Fig. 26, the annular intermediate piece 10 is shown in a bottom view; accordingly, the terminal position element 28 are shown (in Fig. 26, therefore, the annular intermediate piece 10 is shown from the first annular side, in contrast to Fig. 21 where it can be seen from the opposite, second annular side; for the marking of the annular sides see Fig. 20). These, like the pin elements 24 protruding from the outer annular element 20 and the parts leading to them, form parts of the outer annular element 20 (cf. Figs. 22 and 23 by looking at them from below; in this view it cannot be differentiated that the pin elements 24 are located further inward than the terminal position elements 28). Because this is not a sectional drawing, portions of the inner annular element 30 can be seen only as far as the pin elements 24 (this can be understood by comparing Fig. 26 with Fig. 23), and accordingly the narrowing portion 21 can also be seen.

[0162] In Fig. 27, the annular intermediate piece 10 is shown mounted on a can 50 (thus, the can 50 is an exemplary container). In Fig. 27 the annular intermediate piece 10 is provided with a cover 14.

[0163] In Fig. 27, a valve disc 55b is placed onto the neck portion 55a (end portion) of the can 50, and the curved-back end portions of both the neck portion 55a and the valve disc 55b - i.e. , a container connection portion formed by them as a combined end rim thereof - are snapped through the circumferential snap-in flange 19. Of these, the valve disc 55b is shown with a slight overlap with the annular central portion 36, illustrating that they are pressed into each other. The common end rim of the neck portion 55a and the valve disc 55b extends as far as the terminal position element 28 such that it is located between the corresponding portions of the outer annular element 20 and the inner annular element 30. Thus, the annular intermediate piece is mounted (connected) in this way to the can 50 (as a container), more particularly to an end rim formed thereon as described above.

[0164] In Fig. 27 there is also depicted - as an illustration, and, unlike other components, in a head-on view rather than a sectional view - a valve 60 that does not form a part of the invention and forms a separate piece from the annular intermediate piece 10. As it has been touched upon above, the portion of the valve 60 extending above (according to the figure) the valve disc 55b may play a role in positioning the annular intermediate piece 10 by protruding therein. As can be understood also by contemplating Fig. 27, the valve 60 is mounted into the valve disc 55b from below (according to the figure); the valve 60 has a snap-through rim 62 that snaps through an opening in the centre of the valve disc 55b (in Fig. 27 it is shown in the snapped- through state). Other features of the valve 60 are not relevant for the invention as the valve 60 does not form a part of the invention.

[0165] It is therefore also illustrated in Fig. 27, that the can 50 is preferably held between two different materials - which are preferably recycled plastic and to a greater or lesser extent non-recycled plastic materials -, i.e. , the end portion thereof - i.e., according to the above, the container connection portion - is inserted between two different materials.

[0166] Thus, the annular intermediate piece is configured for mounting on a container, preferably around a valve, for mounting to the end rim of a valve disc receiving the valve (this is preferably a joint - i.e., joined together - end rim of the valve disc and the container, i.e., a container connection portion that typically has a circular shape), in line with that the gun is to be secured to the annular intermediate piece. A connection is therefore made between the valve and the gun by inserting the annular intermediate piece therebetween, such that the valve can be operated by the gun for dispensing through the valve the material in the container. This can also be realised by applying a different configuration around the valve (i.e., not only with a valve disc having the illustrated configuration), i.e., what is important is to appropriately secure the annular intermediate piece to the container.

[0167] In relation to the manufacturing method according to the invention the following are also noted.

[0168] The illustrated embodiment has the same (in this way, thus outer) geometry - except that it comprises two parts made preferably of recycled and non-recycled plastic that interlock (engage) with each other in a manner specified above - as the known annular intermediate piece made of a material of a single type.

[0169] In the figures depicting the annular intermediate piece in its entirety it can be seen that, at the fitting of the two annular intermediate pieces - in addition to that the outer annular element 20 and the inner annular element 30 interlocking with each other at the connection element 32 due to its geometry and also by the help of the pin elements 24 (reference is made here as well to Fig. 22 and 23 illustrating this in various views) - preferably, it is necessary to provide a special geometrical configuration for connecting the gun and for mounting the intermediate piece on a container (reference is made e.g. to Figs. 19 and 27), that is, during the preferably applied moulding-on process, appropriately arranged gaps must be left:

[0170] - for example - for mounting on a container (e.g. on a can) - at the bottom (according to the figures) of the annular intermediate piece for forming the container connection space portion 17; and

[0171] - between the outer annular element 20 and the inner annular element 30 for forming the gap that is open at the top (according to the figures) and is interrupted by support elements 18.

[0172] In the preferably applied moulding-on manufacturing method this can be achieved such that, when, after completing the inner annular element, preparations are made for moulding-on the outer annular element, the inner annular element is inserted into an appropriately configured injection (moulding) mould, or the injection mould is transformed around it (for forming the appropriate injection moulding space portion). The inner annular element tightly fits therein, otherwise barb could form at the bottom and top ends (according to the figure) of the annular central portion of the inner annular element (i.e. , if the material of the outer annular element could enter into gaps). Preferably, therefore, prior to injection moulding, such space-filler elements are placed around the inner annular element (as a part of the injection moulding space portion) at the bottom and at the top (i.e., at both ends of the annular central portion) that provide for the desired configuration of the outer annular element to be made. In addition to that, the injection mould also controls the configuration of the outward-lying parts of the outer annular element.

[0173] In relation to the known approaches listed in the introduction it can be concluded that such a configuration cannot be found therein - especially in case moulding is applied for producing lettering on a cap, or in case a gripping layer is made - wherein annular elements inserted into one another would be arranged, and in addition they would also engage one another, and wherein a pin-like element preventing the mutual rotation of two annular elements would protrude from an outer annular element (layer) into the inner annular element (layer).

[0174] The invention is, of course, not limited to the preferred embodiments described in detail above, but further variants, modifications and developments are possible within the scope of protection determined by the claims.

Claims

CLAIMS1. An annular intermediate piece for mounting on a container, which annular intermediate piece comprising an inner annular element (30) and an outer annular element (20) encompassing the inner annular element (30), c h a r a c t e r i s e d in that- the outer annular element (20) has a connection space portion (42), and the inner annular element (30) has an annular central portion (36) and a connection element (32) projecting out from the annular central portion (36) towards the outer annular element (20) and protruding into the connection space portion (42), fitting in a form-closing manner into the connection space portion (42) at its outer edge being farther from the annular central portion (36), and- the outer annular element (20) has at least one pin element (24) protruding into the connection element (32) or protruding through the connection element (32).

2. The annular intermediate piece according to claim 1 , characterised in that the inner annular element (30) is made of recycled plastic.

3. The annular intermediate piece according to claims 1 or 2, characterised in that the outer annular element (20) is formed by moulding on the inner annular element (30).

4. The annular intermediate piece according to any of claims 1 -3, characterised by further comprising a first additional engagement portion and a second additional engagement portion formed, respectively, on the outer annular element (20) and on the inner annular element (30) for the mutual engagement thereof.

5. The annular intermediate piece according to any of claims 1 -4, characterised in that the connection element (32) has a turned rim (34) projecting out transversely with respect to a radial direction (43) and a tangential direction (45) determined by the inner annular element (30).

6. The annular intermediate piece according to any of claims 1 -5, characterised in that the connection element (32) has an outer edge rotation-preventing configuration on its outer edge for preventing rotation of the inner annular element (30) and the outer annular element (20) relative to each other.

7. The annular intermediate piece according to claim 6, characterised in that the outer edge rotation-preventing configuration is configured on the outer edge of the connection element (32) with ribs (39) arranged transversely to a radial direction (43) and a tangential direction (45) determined by the inner annular element (30), and protruding out from the connection element (32) in the radial direction (43).

8. The annular intermediate piece according to any of claims 1 -7, characterised in that, at a first annular side (31 ) thereof configured for mounting on the container, a container connection space portion (17) protruding into between the inner annular element (30) and the outer annular element (20) is formed.

9. The annular intermediate piece according to claim 8, characterised in that one or more terminal position element (28) protrudes from the outer annular element (20) towards the inner annular element (30) to limit a protrusion of the container connection portion of the container into the container connection space portion (17) when being mounted on the container.

10. The annular intermediate piece according to any of claims 1 -9, characterised by having a cover (24) adapted to be arranged on a second annular side (33) thereof formed opposite a first annular side (31 ) thereof configured for mounting on the container.

11. The annular intermediate piece according to claim 10, characterised in that the cover (24) is made of recycled plastic.

12. A method for manufacturing the annular intermediate piece according to any of claims 1 -11 , in the course of which- manufacturing, by injection moulding, the inner annular element (30) in a first injection moulding space portion, and- manufacturing, by injection moulding, the outer annular element (20) around the inner annular element (30) in a second injection moulding space portion such that the connection element (32) fits in a form-closing manner into the connection space portion (42) at its outer edge being farther from the annular central portion (36), and the at least one pin element (24) protrudes into the connection element (32) or protrudes through the connection element (32).

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