A mating plug connector for connecting components for liquid or gaseous media, a plug connector assembly and a method for producing such a mating plug connector

Abstract

The invention relates to a mating plug connector (3) for connecting components for liquid or gaseous media, comprising a connector body (11) which has an insertion section (7) for insertion into a receiving opening (6) of a plug connector (2) and a component interface (10) for connection to one of the components, characterized in that the connector body (11) is formed as a sheet-metal forming.

Description

TECHNICAL FIELD

[0001] The invention relates to a mating plug connector for connecting components for liquid or gaseous media, to a plug connector assembly and to a method for producing such a mating plug connector. BACKGROUND

[0002] A plug connector assembly of the same type with a plug connector and a mating plug connector is known from EP 2 360 411 A1. The plug connector for connecting a line for liquid or gaseous media comprises a sleeve with an insertion opening. The mating plug connector can be inserted into the insertion opening. Furthermore, the plug connector comprises a latching spring which surrounds the sleeve at least on a portion of the circumference of the sleeve and which can be adjusted between a latching position for latching the mating plug connector plugged together with the plug connector and a release position latched relative to the sleeve in which the latching with the mating plug connector is released and the mating plug connector can be pulled out of the insertion opening of the sleeve. The latching spring projects into the interior space surrounded by the sleeve at least on a section of the longitudinal extension thereof in its latching position in which the latching spring can be latched with the mating plug connector. Furthermore, the latching spring is latched in a retaining recess of the sleeve behind a retaining protrusion of the sleeve in its release position latched. The retaining protrusion projects relative to the retaining recess in the axial direction of the sleeve.

[0003] The mating plug connector of EP 2 360 411 A1 is expensive to produce. SUMMARY

[0004] It is the task of the invention to overcome the disadvantages of the prior art and to provide a mating plug connector which can be produced easily.

[0005] This task is solved by the device and the method according to the invention.

[0006] According to the invention, the mating plug connector is configured for connecting components for liquid or gaseous media. The mating plug connector comprises a connector body which has:

[0007] - an insertion section for insertion into a receiving opening of a plug connector;

[0008] - a component interface for connecting with one of the components.

[0009] The connector body is configured as a sheet metal forming.

[0010] The mating connector according to the invention has the advantage that it is easy to manufacture and, in addition, has a very light weight while being strong enough for its intended use.

[0011] In particular, it can be specified that the connector body is configured as a deep-drawn component. Specifically, a connector body configured as a deep-drawn component is easy to manufacture.

[0012] Furthermore, it can be specified that the connector body is a one-piece construction. A one-piece connector body is easy to manufacture and has low error susceptibility.

[0013] In particular, it can be specified that the components to be connected are constructed, for example, in the form of pipes or hoses. Here, the pipes can be coupled to the component interfaces by means of clamping connectors.

[0014] Alternatively, it is conceivable that at least one of the components to be connected is made of sheet metal, for example. Here, the component interface can be directly welded to the sheet metal component. It is also conceivable that the connector body is press-fitted or bonded to the component. Alternatively, a combination of press-fitting and bonding is also conceivable.

[0015] Furthermore, it is suitable that the connector body has a sleeve-shaped first circumferential segment that surrounds the central longitudinal axis of the connector body in cross-section and a sleeve-shaped second circumferential segment that surrounds the central longitudinal axis in cross-section, wherein the first circumferential segment is surrounded by the second circumferential segment, and the first circumferential segment is connected to the second circumferential segment at a first longitudinal end in the region of the insertion segment via a first end wall segment, and the second circumferential segment has a cylindrical sealing segment in the region of the insertion segment. This provides the advantage that the connector body can have sufficient stability and can also have all the functional components for achieving connection with the mating connector. The cylindrical sealing segment can be constructed on the outer circumferential surface of the second circumferential segment.

[0016] Furthermore, it can be specified that, in the region of the insertion section, not only the first circumferential section but also the second circumferential section has a tapered cross-section extending from the cylindrical sealing section toward the first longitudinal end of the connector body. This provides the advantage that the mating connector can be easily inserted into the plug connector. Furthermore, the tapered portion further enhances the stability of the connector body.

[0017] Furthermore, it can be specified that the second sleeve section, on the side of the cylindrical sealing section opposite to the first end wall section, has a widened cross-section adjacent to the cylindrical sealing section. This has the advantage that the widened cross-section allows for compression of the locking spring and thus simplifies the engagement of the mating connector with the mating connector.

[0018] It is also advantageous for an embodiment to provide that the second collar section is spaced apart from the cross-sectional widening on the side facing away from the cylindrical sealing section with an abutment face for a locking element of the plug connector. This has the advantage that the locking element can lock a mating plug connector well in the plug connector by this measure.

[0019] According to a further development, the abutment face is configured annularly and constitutes a second longitudinal end of the second collar section. An abutment face configured in this way can be easy to manufacture and furthermore can have sufficient stability.

[0020] In an alternative embodiment variant, it can be provided that the abutment face is arranged in a locking slit, wherein the locking slit penetrates the second collar section, in particular the cylindrical section, and extends over the annular region of the second collar section. This has the advantage that such a locking slit can be easy to manufacture.

[0021] Furthermore, it can be provided that a lug is configured, which is curved outwards from the second collar section, wherein the lug extends over the annular region of the second collar section and the lug extends over the longitudinal region of the second collar section. Such a lug can be easy to use as a twist lock.

[0022] Furthermore, it can be provided that the second collar section has an outwardly curved flange in the region of the second longitudinal end. This has the advantage that such an outwardly curved flange can be used as an axial stop. Furthermore, an outwardly curved flange can provide an improved stability for the connector body.

[0023] According to a particular embodiment, it is possible for the first collar section to have a tapering at the second longitudinal end. This has the advantage that the mating plug connector can be easy to engage with a line.

[0024] The application also relates to a plug-in assembly, comprising:

[0025] - a mating plug connector;

[0026] - a plug connector having a receiving opening, wherein the receiving opening is configured such that the mating plug connector can be inserted into the receiving opening.

[0027] The mating plug connector is configured according to the above-mentioned embodiments.

[0028] A plug-in assembly configured in this way has an easy manufacturability.

[0029] According to the application, a method for producing a mating plug connector is provided. The method comprises the following method steps:

[0030] - providing a planar sheet metal plate;

[0031] - deep-drawing a pot-shaped piece from the planar sheet metal plate;

[0032] - folding the pot-shaped piece to form a sleeve-shaped first sleeve section which, in cross section, surrounds a central longitudinal axis of the plug connector, and a sleeve-shaped second sleeve section which, in cross section, surrounds the central longitudinal axis, wherein the first sleeve section is surrounded by the second sleeve section, and the first sleeve section is connected to the second sleeve section at a first longitudinal end by a first end wall section in the region of the insertion section, and the second sleeve section has a cylindrical sealing section in the region of the insertion section.

[0033] The method according to the application has the advantage that a mating plug connector can be easily produced by the method and, in addition, has a very small weight in a strength which is sufficient for the intended use.

[0034] It can furthermore be provided that a locking slit is punched in the pot-shaped piece after the deep-drawing of the pot-shaped piece. By this measure, the locking slit can be easily produced.

[0035] It can furthermore be provided that, after the folding of the pot-shaped piece, a lug is bent outwards from the second sleeve section, wherein the lug extends over a circumferential region of the second sleeve section, and the lug extends over a longitudinal region of the second sleeve section. By this measure, the lug as a torsion locking device can be easily produced.

[0036] It is also advantageous according to an embodiment, according to which it can be provided that, after the folding of the pot-shaped piece, a central hole is punched in the pot-shaped piece. By this measure, a fluid permeability of the mating plug connector can be achieved, wherein a bottom resulting from the production is removed. BRIEF DESCRIPTION OF DRAWINGS

[0037] For a better understanding of the application, the application is explained in more detail with the help of the following drawings.

[0038] in which, respectively, a very simplified schematic representation is shown:

[0039] Figure 1 a perspective view of one embodiment variant of the plug connector assembly, shown in quarter cross section;

[0040] Figure 2 a longitudinal sectional view of a first embodiment of the mating plug connector;

[0041] Figure 3 perspective view showing a quarter section of the first embodiment of the mating plug connector;

[0042] Figure 4 longitudinal sectional view showing the second embodiment of the mating plug connector;

[0043] Figure 5 perspective view showing a quarter section of the second embodiment of the mating plug connector;

[0044] Figure 6 first method step for manufacturing the second embodiment of the mating plug connector;

[0045] Figure 7 second method step for manufacturing the second embodiment of the mating plug connector;

[0046] Figure 8 third method step for manufacturing the second embodiment of the mating plug connector;

[0047] Figure 9 fourth method step for manufacturing the second embodiment of the mating plug connector;

[0048] Figure 10 fifth method step for manufacturing the second embodiment of the mating plug connector. DETAILED DESCRIPTION

[0049] It is initially to be determined that in the differently described embodiments identical components are provided with identical reference numerals or identical component names, wherein the disclosure contained in the entire description can be transferred meaningfully to the identical components having the identical reference numerals or identical component names. The positional expressions chosen in the description, such as upper, lower, side, etc., also relate to the current description and the shown figures, and the positional expressions can be transferred meaningfully to the new positions when the position changes.

[0050] Figure 1 perspective view showing the plug-in assembly 1 with the plug-in connector 2, wherein the plug-in assembly is shown in a quarter section. Furthermore, a mating plug-in connector 3 is shown schematically, which can be connected with the plug-in connector 2. The cooperation between the plug-in connector 2 and the mating plug-in connector 3 is described sufficiently known in AT 509196 B1. Figure 1

[0051] Furthermore, a tube 4 is shown schematically, to which the plug-in connector 2 can be coupled. The tube 4 can be a rigid element, for example a plastic tube, for example. In another embodiment variant, the tube 4 can be constructed as a flexible line made of rubber material.

[0052] ​The plug connector 2 comprises a main body which is preferably configured as a one-piece formed part, for example as a deep-drawn part, in particular from a sheet of stainless steel. It can also be provided, in particular, that a sheet of steel which can be coated or which is subsequently coated can be involved here.

[0053] The plug connector assembly 1 is preferably used in a motor vehicle, in particular in a road vehicle having an internal combustion engine, for example a passenger car or a lorry.

[0054] It is of course also conceivable that the plug connector assembly 1 is used in other applications having an internal combustion engine. This can be, for example, the use of the plug connector assembly 1 in stationary installations, marine engines, aircraft engines, construction machinery, vehicles which are driven by batteries or hybrid drives, etc.

[0055] In particular, the plug connector assembly 1 can be used for connecting different components of a fresh air supply device to an internal combustion engine. It can be provided, for example, that the plug connector 2 and the corresponding mating plug connector 3 are provided for connecting two parts in the intake region of a turbocharger. It can also be provided, for example, that such a plug connector assembly 1 is used for connecting two components in the pressure side leading from a turbocharger. In yet another application, it is also conceivable that the plug connector assembly is used for connecting a line for conducting water.

[0056] As can be seen from Figure 1 It can also be seen that the plug connector 2 can have a receiving opening 6 for receiving the insertion section 7 of the mating plug connector 3. A seal 8 can be arranged in the region of the receiving opening 6, which is used to establish a sealed connection between the plug connector 2 and the mating plug connector 3. It can be provided, in particular, that the seal 8 arranged in the receiving opening 6 rests against a cylindrical sealing section 9 of the mating plug connector 3 in the plugged-together state of the plug connector 2 and the mating plug connector 3.

[0057] As can be seen from Figure 1 It can also be seen that it can be provided that the mating plug connector 3 has a component interface 10 for connecting a component for conducting a fluid or a gas. The component for conducting a fluid or a gas is not shown here for reasons of simplicity.

[0058] As can be seen from Figure 1 It can also be seen that it can be provided that a locking element 5 is configured, which can be activated and deactivated, so that the plug connector 2 and the mating plug connector 3 can be separated from one another or connected to one another as required. The locking element 5 can be placed in a latching position in which the plug connector 2 and the mating plug connector 3 are locked relative to one another. Furthermore, the locking element 5 can be placed in a release position in which the mating plug connector 3 can be inserted into the plug connector 2 or removed therefrom. It can be provided, in particular, that the locking element 5 is configured in the form of a latching spring.

[0059] Figure 2 A longitudinal cross-sectional view of a first embodiment of the mating connector 3 is shown. Figure 3 A first embodiment of the mating connector 3 is shown in a quarter-section perspective view.

[0060] With the help of Figure 2 and Figure 3 The first embodiment of the mating connector 3 is described in an overview.

[0061] As by Figure 2 It can be seen that the mating connector 3 can be configured as a sheet metal molded part. Alternatively, it is conceivable that the mating connector 3 can be configured as a plastic injection molded part. In particular, it can be specified that the mating connector 3 includes a connector body 11. The connector body 11 may include a first sleeve section 12 and a second sleeve section 13. These two sleeve sections 12 and 13 can be constructed with rotational symmetry, at least in their basic shape, about the central longitudinal axis 14 of the connector body 11.

[0062] As by Figure 2 It can also be seen that the first sleeve section 12 and the second sleeve section 13 are coupled to each other at the first longitudinal end 15 of the connector body 11 via the first end wall section 16. In particular, it can be specified that the first sleeve section 12, the second sleeve section 13, and the first end wall section 16 are composed of a one-piece, continuous plate.

[0063] In particular, it can be specified that, in the longitudinal section, in the region of the first end wall section 16, the plate is folded 180° and transitions from the first circumferential section 12 to the second circumferential section 13.

[0064] As by Figure 2 It can also be seen that the first bezel section 12 and the second bezel section 13 can be specified to have a tapered cross-section 17 in the region of the first longitudinal end 15. The first bezel section 12 may have a columnar shape adjacent to the tapered cross-section 17. For example, by Figure 2 It can also be seen that the first sleeve section 12 may be provided with a tapered portion 19 at the second longitudinal end 18 of the first sleeve section 12. In particular, the tapered portion 19 may be constructed in the form of a flange extending inward from the cylindrical section of the first sleeve section 12.

[0065] As by Figure 2 It can also be seen that the second sleeve section 13 adjacent to the tapered section 17 has a cylindrical sealing section 9. A widened section 20 can be constructed adjacent to the cylindrical sealing section 9. A contact surface 22 for contacting the locking element 5 can be constructed at a distance 21 from the widened section 20. Figure 2It can be seen that it can be provided that the abutment face 22 is configured in such a way that the second sleeve section 13 ends here.

[0066] Figure 4 A longitudinal sectional view of a second embodiment of the mating plug connector 3 is shown. Figure 5 A quarter sectional perspective view of a second embodiment of the mating plug connector 3 is shown.

[0067] In Figure 4 and 5 further and, if necessary, self-contained embodiments of the mating plug connector 3 are shown, in which, again, the same reference numerals or component names as in the preceding Figure 2 and 3 are used for identical parts. In order to avoid unnecessary repetition, reference is made to the detailed description in the preceding Figure 2 and 3 . The same applies to the following description.

[0068] As can be seen from Figure 4 it can be provided that a lug 23 is configured in the second sleeve section 13, which lug is bent outwards from the second sleeve section 13. The lug 23 can serve as a twist lock.

[0069] As can be seen from Figure 5 the lug 23 can have a defined extension in the circumferential region of the second sleeve section 13 or in the longitudinal region of the second sleeve section 13. In particular, it can be provided that the lug 23 is arranged in a cylinder-shaped section 24.

[0070] As can be seen from Figure 4 it can also be provided that a flange 25 is configured adjacent to the cylinder-shaped section 24, which flange projects outwards relative to the cylinder-shaped section 24. The flange 25 can be configured circumferentially.

[0071] As can be seen from Figure 5 it can also be provided that a locking gap 26 is configured in the cylinder-shaped section 24 of the second sleeve section 13, which locking gap serves to form the abutment face 22. The locking gap 26 can likewise have a defined longitudinal extension or a defined circumferential extension.

[0072] As can be seen from Figure 5 it can be provided that a plurality of locking gaps 26 are configured in the second sleeve section 13 spaced apart from one another in the circumferential direction. It can furthermore be provided that a plurality of lugs 23 are formed on the second sleeve section 13 spaced apart from one another in the circumferential direction.

[0073] In particular, it can be provided that two lugs 23 are configured in the second sleeve section 13 opposite one another at 180°.

[0074] In particular, it can be provided that the two locking slits 26 are arranged opposite one another at 180° in the second collar section 13.

[0075] In Figures 6 to 10 the individual method steps for manufacturing the second embodiment of the mating plug connector 3 are shown.

[0076] In particular, the entire outer portion of the connector body 11 is referred to as the second collar section 13. As can be seen from Figure 5 It can be provided that the second collar section 13 is divided into the following regions from the first longitudinal end 15: the cross-sectional taper 17, the cylindrical sealing section 9, the cross-sectional widening 20, the cylindrical section 24, the flange 25.

[0077] In the first embodiment according to Figure 2 and Figure 3 the cylindrical section 24 has only a very short length.

[0078] In particular, the entire inner portion of the connector body 11 is referred to as the first collar section 12. As can be seen from Figure 5 It can be provided that the first collar section 12 is divided into the following regions from the first longitudinal end 15: the cross-sectional taper 17, the main portion 29 of the first collar section 12, the taper 19.

[0079] The individual regions of the first collar section 12 can be identical in all embodiments and are identically labeled.

[0080] Figure 6 The first method step for manufacturing the second embodiment of the mating plug connector 3 is shown. As can be seen from Figure 6 It can be provided that in the first method step a pot 27 is drawn from a flat sheet blank. Depending on the manufacturing conditions, the pot 27 can have a bottom 28 as a result of the manufacturing.

[0081] In the second method step, it can be provided that the locking slits 26 are punched out of the pot 27, as is shown in Figure 7

[0082] As can be seen from Figure 8 It can be provided that in the third method step the bottom 28 of the pot 27 is folded over or drawn in, so that the first collar section 12 and the second collar section 13 are formed.

[0083] It is noted here that the dimensional proportions in the individual attached Figures 6 to 10 are not to scale, but rather the axial extension of certain sections of the mating plug connector 3 is lengthened or shortened for the sake of clarity.

[0084] As can be seen from Figure 9 ​It can be seen that in the fourth method step, the lug 23 is punched or rather bent out of the second collar section 13.

[0085] As is shown by Figure 10 It can be seen that in the fifth method step, not only the first collar section 12 but also the second collar section 13 is bent inwards in the region of the first longitudinal end 15, thereby forming the cross-sectional taper 17.

[0086] In a further method step, which is likewise shown in Figure 10 , the bottom 28 can be punched, thereby configuring the taper 19.

[0087] The method steps for manufacturing the first embodiment of the mating plug connector 3 are similar to the method steps shown and described in Figures 6 to 10 . Since the first embodiment of the mating plug connector 3 is easier to manufacture and some method steps are deleted here with respect to the described method, the manufacturing method is not described separately or shown in the drawings. In particular, in order to manufacture the first embodiment, the method steps for punching out the locking slit 26 corresponding to Figure 7 and the method steps for manufacturing the lug 23 according to Figure 9 are not carried out or rather omitted.

[0088] The embodiments show possible implementation variants, wherein it is noted here that the application is not limited to the particularly shown implementation variants of the application, but rather different combinations of the individual implementation variants with one another are also possible and the said variant possibilities are within the ability of the person skilled in the art on the basis of the teaching by the technical means of the application.

[0089] The scope of protection is determined by the claims. However, the claims should be interpreted not only in view of the description and the drawings. Individual features or feature combinations from the shown and described different embodiments can be independent inventive solutions in themselves. The task on which the independent inventive solutions are based can be derived from the description.

[0090] All specifications in the present description regarding numerical ranges are to be understood as including any and all partial ranges therein, for example the specification 1 to 10 is to be understood as including all partial ranges starting from the lower limit 1 and the upper limit 10, that is to say all partial ranges starting with a lower limit of 1 or more and ending with an upper limit of 10 or less, for example 1 to 1.7 or 3.2 to 8.1 or 5.5 to 10.

[0091] Finally, it is lastly pointed out for the sake of form that the individual elements are shown partially not to scale and / or enlarged and / or reduced for better understanding of the configuration.

[0092] List of reference signs

[0093] 1 plug assembly

[0094] 2 plug connector

[0095] 3 mating plug connector

[0096] 4 tube

[0097] 5 locking element

[0098] 6 receiving opening

[0099] 7 insertion section

[0100] 8 seal

[0101] 9 cylindrical sealing section

[0102] 10 component interface

[0103] 11 connector body

[0104] 12 first collar section

[0105] 13 second collar section

[0106] 14 longitudinal axis

[0107] 15 first longitudinal end

[0108] 16 first end wall section

[0109] 17 cross-sectional taper

[0110] 18 second longitudinal end

[0111] 19 taper

[0112] 20 cross-sectional widening

[0113] 21 distance

[0114] 22 abutment face

[0115] 23 lug

[0116] 24 cylindrical section

[0117] 25 flange

[0118] 26 locking gap

[0119] 27 basin

[0120] 28 bottom

[0121] 29 main portion

Claims

1. A mating plug connector (3) for connecting components for liquid or gaseous media, comprising a connector body (11) which has: - an insertion section (7) for insertion into a receiving opening (6) of a plug connector (2); - a component interface (10) for connection with one of the components, the connector body (11) being configured as a sheet-metal forming, the connector body (11) having a sleeve-shaped first sleeve section (12) which, in cross section, surrounds a central longitudinal axis (14) of the connector body (11) and a sleeve-shaped second sleeve section (13) which, in cross section, surrounds the central longitudinal axis (14), the first sleeve section (12) being surrounded by the second sleeve section (13) and the first sleeve section (12) being connected to the second sleeve section (13) at a first longitudinal end (15) in the region of the insertion section (7) by a first end wall section (16) and the second sleeve section (13) having a cylindrical sealing section (9) in the region of the insertion section (7), at least one lug (23) being configured which is punched and bent outwards from the second sleeve section (13), the lug (23) extending over a circumferential region of the second sleeve section (13) and the lug (23) extending over one longitudinal region of the second sleeve section (13). In the region of the insertion section (7), not only the first sleeve section (12) but also the second sleeve section (13) has a cross-sectional tapering (17) from the cylindrical sealing section (9) towards the first longitudinal end (15) of the connector body (11). The second sleeve section (13) has a cross-sectional widening (20) adjoining the cylindrical sealing section (9) on the side of the cylindrical sealing section (9) facing away from the first end wall section (16). The second sleeve section (13) has an abutment face (22) on the side facing away from the cylindrical sealing section (9) at a distance (21) from the cross-sectional widening (20) for a locking element of the plug connector. characterized in that The abutment face (22) is configured circumferentially and constitutes a second longitudinal end (18) of the second sleeve section (13).

2. The mating plug connector (3) according to claim 1, characterized in that A locking gap (26) is configured in which the abutment face (22) is arranged, the locking gap (26) penetrating the second sleeve section (13) and extending over a circumferential region of the second sleeve section (13).

3. The mating connector (3) according to claim 1 or 2, characterized in that The second sleeve section (13) has an outwardly curved flange (25) in the region of the second longitudinal end (18).

4. The mating plug connector (3) according to claim 3, characterized in that The first sleeve section (12) has a tapering (19) at the second longitudinal end (18).

5. The mating plug connector (3) according to claim 4, characterized in that 9. A plug connector assembly (1) comprising: - a mating plug connector (3); 6. The mating plug connector (3) according to claim 4, characterized in that ​ 7. The mating plug connector (3) according to claim 5, characterized in that ​ 8. The mating plug connector (3) according to claim 5, characterized in that ​ ​ ​ - a plug connector (2) having an accommodation opening (6) which is designed in such a way that the mating plug connector (3) can be inserted into the accommodation opening, characterized in that the mating plug connector (3) is designed according to any one of claims 1 to 8.

10. A method for producing a mating plug connector (3), the method comprising the following method steps: - providing a planar metal sheet; - drawing a pot (27) from the planar metal sheet; - folding the pot (27) over in order to shape a sleeve-shaped connector body (11) having a first sleeve section (12) which, in cross section, surrounds a central longitudinal axis (14) of the connector body (11) and a sleeve-shaped second sleeve section (13) which, in cross section, surrounds the central longitudinal axis (14), the first sleeve section (12) being surrounded by the second sleeve section (13) and the first sleeve section (12) being connected to the second sleeve section (13) at a first longitudinal end (15) in the region of an insertion section (7) of the connector body (11) by a first end wall section (16) and the second sleeve section (13) having a cylinder-shaped sealing section (9) in the region of the insertion section (7), characterized in that - after folding the pot (27) over, at least one lug (23) is punched and bent outwards from the second sleeve section (13), the lug (23) extending over a circumferential region of the second sleeve section (13) and the lug (23) extending over one longitudinal region of the second sleeve section (13).

11. The method of claim 10, wherein, - after drawing the pot (27), a locking gap (26) is punched in the pot (27).

12. The method according to claim 10 or 11, characterized in that, - after folding the pot (27) over, a central hole is punched from the pot (27). - after folding the pot (27) over, a central hole is punched from the pot (27).

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