EP4617469A1

EP4617469A1 - Method of joining dissimilar profiles

Info

Publication number: EP4617469A1
Application number: EP24163087.0A
Authority: EP
Inventors: Luc SOETAERT; Karel VANALDERWEIRELDT
Original assignee: Deceuninck NV
Current assignee: Deceuninck NV
Priority date: 2024-03-12
Filing date: 2024-03-12
Publication date: 2025-09-17

Abstract

A method of joining:- a first profile (1), having a first connection end (11), and- a second profile (2), having a second connection end (21), finished at a 45 degree angle relative to its longitudinal direction (Y);- whereby the first profile (1) and the second profile (2) have a different cross-section;the method comprising:- providing a corner piece (3) comprising a primary portion (31) and a secondary portion (32), whereby the secondary portion (32) extends substantially perpendicularly to the primary portion (31), whereby the first connection end (11) is configured to adhere to the primary portion (31);- inserting the primary portion (31) into a cavity (4) at the first connection end (11) of the first profile (1); andconnecting a first connecting surface (22) of the secondary portion (32) with a second connecting surface (23) at the second connection end (21) of the second profile (2), whereby the first connecting surface (22) and the second connecting surface (23) form a miter joint (6).

Description

Field of the Invention

The present invention pertains to a method of joining a first profile and a second profile in a miter joint, whereby the first profile and the second profile have a different cross-section. The invention also pertains to a corner piece used in such a method, and a window system based on such a method.

Background

When manufacturing PVC window frames, several PVC profiles are joined together to form a frame. For production and aesthetical reasons, the joint is preferably a miter joint. During a standard welding process, two PVC profiles that have been cut to a miter on both sides are heated with a heated plate (welding mirror) and then pressed together. This creates a welding burr, which is subsequently cleaned up by machine operations.
In certain situations, it may be necessary to join PVC profiles of different sightlines, shapes or profile designs. After welding dissimilar profiles using the standard process, some finishing work needs to be done and a separately molded cap may have to be placed to finish the joint aesthetically.
Moreover, PVC profiles used in the manufacturing of window frames typically have several hollow chambers, one of which is designed to receive a metal reinforcement rod. During the welding of dissimilar profiles, one of the chambers of one profile will not be sealed off by its counterpart in the other profile, leading to a risk of ingress of moisture and dirt.
Also, dissimilar profiles will present dissimilar contact surfaces when cut, leading to a reduced welding area and hence a reduced weld strength.
European patent application no. EP 3 181 794 A1 discloses joining two hollow chamber profiles (made of plastic in the miter area), which have the same construction depths but different face widths and which each have an overlap on their inner side and a wall forming the visible surface of this inner side and covering the overlap, by means of a method which comprises the following steps: the hollow chamber profiles are cut to length or trimmed, forming a miter surface at 45° to the longitudinal extension; the hollow chamber profiles are welded together in the miter area; partial area of the welded corner is removed by machining, whereby the wall covering the overlap remains as the first overlap and a part of the wall forming the visible surface of the other side overlaps the profile area projecting behind it as a further overlap, and the milled miter area is covered by means of an end cap.
The present invention aims at resolving the above mentioned problems and avoiding the use of an end cap, which is highly visible to users on both sides of the door, and which may be considered unaesthetic.
Additionally, the present invention aims at improving the water tightness of the profiles, increasing the service life of the metal reinforcement rod.
Additionally, the present invention aims at improving the load capacity of the load capacity, with respect to the state of the art.

Summary of the Invention

According to the present invention, there is provided a method of joining a first profile, having a first connection end, and a second profile, having a second connection end, finished at a 45 degree angle relative to its longitudinal direction Y. The first profile and the second profile have a different cross-section. The method according to the present invention comprises steps of:

providing a corner piece comprising a primary portion and a secondary portion, whereby the secondary portion extends substantially perpendicularly to the primary portion, whereby the first connection end is configured to adhere to the primary portion;
inserting the primary portion into a cavity at the first connection end of the first profile; and
connecting a first connecting surface of the secondary portion with a second connecting surface at the second connection end of the second profile, whereby the first connecting surface and the second connecting surface form a miter joint.

The present disclosure solves the aforementioned technical problems. In fact, the corner piece allows to join in a more aesthetic way two profiles with different sightlines as only a miter joint is visible from outside.
Additionally, due to the conformation of the first profile and the corner piece, when the corner piece is inserted in the first profile, it guarantees insulation of the first profile.
Moreover, the first connecting surface of the corner piece similar to the second connection surface of the second profile. Thus, strength at the weld joint is recovered.
According to an embodiment of the present invention, the first and the second profile are made of PVC. Advantageously, the weight of the window system is reduced.
According to an embodiment of the present invention, the method comprises gluing the primary portion into the cavity of the first profile via an opening. Advantageously, the connection between the first profile and the corner piece is secured. More advantageously, tightness of the window is improved.
According to and embodiment of the present invention, the connecting comprises welding the second profile to the secondary portion. Advantageously, the welding guarantees a secure connection between the profile and the corner piece, improving the stability of the window system.
According to an embodiment of the present invention, the welding can be carried out by a seamless welding machine. Advantageously, no polishing has to be performed on the window system.
According to an embodiment of the present invention, polishing a weld burr created between the first profile and the second profile during said joining by means of a mirror welding machine. Specifically, this occurs when the welding operation is carried out by mirror welding. Advantageously, a more aesthetically pleasing window system is obtained after polishing the weld burr created between the first and the second profile.
The technical effects and advantages of embodiments of the corner piece and the window system according to the present invention correspond, mutatis mutandis, to those of the corresponding embodiments of the method according to the present invention.

Brief description of the drawings

Various technical effects and advantages of embodiments of the present invention will now be described with reference to the accompanying figures, in which:

Figure 1 illustrates a perspective view of a portion of a window system,
Figure 2a illustrates a first profile of a window system before pre-milling operation,
Figure 2b illustrates a perspective view of a second profile of a window system,
Figure 3 illustrates a perspective view of a first embodiment of the first profile of a window system after pre-milling operation,
Figure 4 illustrates a step of gluing a corner piece,
Figure 5 illustrates a step of inserting the corner piece in the first profile,
Figure 6 illustrates the corner piece inserted in the first profile,
Figure 7 illustrates a first perspective view of a first embodiment of the corner piece, and
Figure 8 illustrates a second perspective view of the first embodiment of the corner piece,
Figure 9 illustrates a perspective view of a second embodiment of the corner piece,
Figure 10 illustrates a perspective section view of a window system with a second embodiment of the second profile,
Figure 11 illustrates a top section view of the corner piece inserted in the first profile.

Detailed description of the invention

The present invention will be described with respect to particular embodiments and with reference to certain drawings, but the invention is not limited thereto but only by the claims. Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment, but may. Furthermore, the particular features, structures or characteristics may be combined in any suitable manner, as would be apparent to one of ordinary skill in the art from this disclosure, in one or more embodiments.
Similarly, it should be appreciated that in the description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. This method of disclosure, however, is not to be interpreted as reflecting an intention that the claimed invention requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
Furthermore, while some embodiments described herein include some but not other features included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the invention, and form different embodiments, as would be understood by those in the art. For example, in the following claims, any of the claimed embodiments can be used in any combination.
In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the invention may be practiced without these specific details. In other instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
A method of joining profiles to form a miter joint 6 is disclosed.
A portion of a first profile 1 is shown in Figure 3 and Figure 10 and it has a first connection end 11. The first profile 1 extends along its longitudinal direction X. In a first embodiment, shown in Figure 3, the first connection end 11 of the first profile 1 is finished substantially perpendicularly with respect to its longitudinal direction X. In a second embodiment, shown for example in Figure 10, the first connection end 11 forms an angle a with respect to the longitudinal direction X. In the embodiment shown in Figure 10, the angle α is comprised between 60° and 90° as a counter-clockwise rotation with respect to the longitudinal direction X. However, it is clear that the disclosed range of the angle α is exemplary and not limiting. It is clear to the skilled person that the angle α could have any value between 0 and 180 degree angle.
As will be disclosed with more detail in the next paragraphs of the description, the first connection end 11 is configured to adhere to a corner piece 3.
A portion of a second profile 2 is shown in Figure 2b and it has a second connection end 21. The second profile 2 extend along its longitudinal direction Y. The second connection end 21 is finished at a 45 degree angle relative to its longitudinal direction Y.
Preferably, the first profile 1 and the second profile 2 are made of PVC.
Preferably, when the first profile 1 and the second profile 2 are joined together, the longitudinal direction X of the first profile 1 is perpendicular to the longitudinal direction Y of the second profile 2, as shown in Figure 1.
More preferably, when the first profile 1 and the second profile 2 are joined together, the longitudinal direction X is arranged vertically. Still preferably, when the first profile 1 and the second profile 2 are joined together, the longitudinal direction Y is arranged horizontally.
A direction Z identifies the direction relative to the depth of a window system 5, as shown in Figure 1. The direction Z is perpendicular to the longitudinal directions X,Y respectively of the first and the second profiles 1, 2.
The first profile 1 and the second profile 2 have a different cross-section. Without loss of generality, it may be assumed herein that the cross-section of the first profile 1 is larger than the cross section of the second profile 2.
In the preferred embodiment, the first depth D1 of the first profile 1 along the direction Z and the second depth D2 of the second profile 2 along the direction Z are equal.
Preferably, a first width W1 of the first profile 1 along the longitudinal direction Y is larger than a second width W2 of the second profile 2 along the longitudinal direction X, as visible in Figures 2a, 2b and 3.
The method comprises a first step of providing a corner piece 3, shown in Figure 5. The corner piece 3 comprises a primary portion 31 and a secondary portion 32. The secondary portion 32 extends substantially perpendicularly to the primary portion 31. The corner piece 3 will be described in more detail in a subsequent section of the present description.
Preferably, the method comprises a step of gluing the primary portion 31 into a cavity 4 of the first profile 1 via an opening 41, as shown in Figures 4-6. Preferably, the opening 41 is positioned at the first connection end 11.
More preferably, the method comprises a sub-step of applying glue on the primary portion 31, as shown in Figure 4. Still preferably, the glue is applied on an attachment surface 33 of the primary portion, which will be described in more detail.
The method comprises a subsequent step of inserting the primary portion 31 into the cavity 4 at the first connection end 11 of the first profile 1.
The glue on the attachment surface 33 of the primary portion 31 is configured to be in contact with the first connection end 11 of the first profile 1.
In the preferred embodiment, the primary portion 31 is inserted in the profile with the largest width.
Preferably, the primary portion 31 is glued into the cavity 4 via a sealant.
Still advantageously, the sealant seals the cavity 4 of the first profile 1 from external agents, such as water, improving the water tightness of the window system 5.
According to another embodiment, the corner piece 3 is coupled to the first profile 1 with a pre-mounted seal. Advantageously, the pre-mounted seal does not need to be glued by means of the sealant to guarantee the tightness of the window system 5.
The method comprises a further step of connecting a first connecting surface 22 of the secondary portion 32 of the corner piece 3 with a second connecting surface 23 at the second connection end 21 of the second profile 2 so that the first connecting surface 22 and the second connecting surface 23 form a miter joint 6.
Preferably, the step of connecting the first connecting surface 22 with the second connecting surface 23 comprises a sub-step of welding the second profile 2 to the secondary portion 32.
In the preferred embodiment, the sub-step of welding is carried out by a seamless welding machine. Advantageously, in this embodiment, there is no welding burr to clean.
According to an alternative embodiment, the sub-step of welding produces a weld burr. Preferably, the sub-step of welding is carried out via a mirror welding machine. According to the alternative embodiment, the method further comprises a step of polishing a weld burr created between the first profile 1 and the second profile 2 during the joining.
More preferably, polishing occurs manually or via partially automated operations, since part of the weld burr is positioned in an area which cannot be access by most processing machines. Thus, the polishing step is carried out according to the specific needs. Even more preferably, the step of polishing is carried out via welding machines that can also perform polishing, such as Graf machines.
Preferably, the method comprises a pre-milling step. Still preferably, the pre-milling step is performed before the step of inserting the primary portion 31 into the cavity 4 of the first profile 1.
The pre-milling step is performed on the profile with the largest width. In the present disclosure, pre-milling is performed on the first profile 1.
Figure 2a shows a perspective view of the first profile 1, before pre-milling. Before pre-milling, the first connection end 11 of the first profile 1 is finished at a 45 degree angle relative to its longitudinal direction X.
Figure 3 shows a perspective view of the first profile 1, after pre-milling. After pre-milling, the first connection end 11 of the first profile 1 is finished substantially perpendicularly with respect to its longitudinal direction X.
Advantageously, the milling is performed before joining the profiles so that only a single profile is manipulated, instead of the window system 5.
In the following paragraphs of the present disclosure, a corner piece 3 according to the present invention will be described.
The corner piece 3 comprises a primary portion 31 and a secondary portion 32, as shown for example in Figures 4 and 5.
The corner piece 3 is made of a polymeric material. Preferably, the corner piece 3 is made of PVC. Preferably, the corner piece 3 is produced by injection molding.
The primary portion 31 is configured to be inserted into a cavity 4 of a first profile 1. It is clear that the first profile 1 may comprise a plurality of cavities 4.
The primary portion 31 is configured to be inserted into a cavity 4 of a first profile 1 via an open end 13 at a first connection end 11 of said first profile 1. In a first embodiment, the connection end 11 is finished substantially perpendicularly with respect to its longitudinal direction X'. Preferably, the longitudinal direction X' of the primary portion 31 is parallel to the longitudinal direction X of the first profile 1. It is clear that the corner piece 3 may comprise a plurality of primary portions 31, projecting along the longitudinal direction X' and each configured to be inserted in a respective cavity 4.
Still advantageously, the addition of a corner piece 3 provides a prolonged service life of the window system 5 due to the improved dynamic load capacity.
Preferably, as shown for example in Figure 4, the primary portion 31 comprises a first couple of sides 39a substantially parallel to each other and to the direction Z. Still preferably, the primary portion 31 comprises a second couple of sides 39b, substantially parallel to each other and substantially orthogonal to the first couple of sides 39a.
The secondary portion 32 extends substantially perpendicularly to said primary portion 31. The secondary portion 32 extends along a longitudinal direction Y'. Preferably, the longitudinal direction Y' of the secondary portion is parallel to the longitudinal direction Y of the second profile 2.
After the insertion of the primary portion 31 in the cavity 4, the first connection end 11 is configured to adhere to the primary portion 31.
The cavity 4 of the first profile 1, in which the primary portion 31 is inserted, is delimited by a wall 43. The wall 43 comprises an internal surface 42, visible in Figure 3, which is configured to face the primary portion 31. The wall 43 comprises an external surface 44 facing the external environment, visible in Figure 1.
Preferably, the primary portion 31 comprises a perimetral wall 36 extending along the longitudinal direction X'. Still preferably, the perimetral wall 36 defines a cavity 38, as visible from Figure 4. Even more preferably, the perimetral wall 36 comprises an external surface 36a and an inner surface 36b. The external surface 36a of the perimetral wall 36 of the primary portion 31 is configured to face the internal surface 42 of the wall 43 of the cavity 4, when the primary portion 31 is inserted in the cavity 4. The inner surface 36b of the perimetral wall 36 faces the cavity 38 of the primary portion 31.
The primary portion 31 comprises an attachment surface 33 that extends along the longitudinal direction X' of the primary portion 31 and it is configured to be glued to the internal surface 42 of the wall 43 delimiting the cavity 4 of the first profile 1. Preferably, the attachment surface 33 extends along the perimeter of the external surface 36a of the perimetral wall 36 of the primary portion 31, as shown in Figure 4. Still preferably, the attachment surface 33 is positioned on a first end 37 of the primary portion 31 in contact with the secondary portion 32.
During the steps of gluing the primary portion 31 into the cavity 4 of the first profile 1, described in a previous section of the description, the glue is placed on the attachment surface 33 of the primary portion 31.
Preferably, the first profile 1 comprises an attachment surface that extends along the longitudinal direction X of the internal surface 42 of the wall 43. The attachment surface of the first profile 1 is configured to be attached to the attachment surface 33 of the primary portion 31 by means of the glue. More preferably, the attachment surface of the cavity 4 extends along the perimeter of the internal surface 42 of the wall 43. Still preferably, the attachment surface is positioned substantially at the opening 41 of the cavity 4.
The primary portion 31 of the corner piece 3 comprises a first set of features 35 extending along the longitudinal direction X', as visible from Figure 4. The cavity 4 comprises a second set of features 45 on the internal surface 42 of the wall 43, configured to engage with the first set of features 35 in a form-fitting manner. An example of the first and second set of features 35, 45 is shown in Figure 11.
In a first embodiment, the primary portion 31 comprises a plurality of grooves 35a and ridges 35b extending along the longitudinal direction X' of the primary portion 31. Preferably, the grooves 35a and the ridges are arranged on the external surface 36a of the perimetral wall 36 of the primary portion 31. The grooves 35a and the ridges 35b are configured to be coupled with respective ridges 45a and grooves 45b extending in the cavity 4 along the longitudinal direction X of the first profile 1.
Advantageously, the coupling of grooves 35a, 45b and ridges 35b, 45a of the primary portion 31 and of the first profile 1 provides a stronger joint.
In an alternative embodiment, not shown in the drawings, the primary portion 31 comprises a plurality of grooves 35a. Still in the alternative embodiment, the first profile 1 comprises ridges 45a, configured to be coupled with the grooves 35a of the primary portion 31.
In another alternative embodiment, not shown in the drawings, the primary portion 31 comprises a plurality of ridges 35b. Still in the alternative embodiment, the first profile 1 comprises grooves 45b, configured to be coupled with the ridges 35b of the primary portion 31.
The secondary portion 32 comprises a first connecting surface 22 forming a 45 degree angle with respect to the longitudinal direction X' of the primary portion 31. The first connecting surface 22 is configured to be at least partially connected to a second connecting surface 23 of the second profile 2.
The secondary portion 32 comprises a first connecting surface 22 forming a 45 degree angle with respect to the longitudinal direction X' of the primary portion 31. The first connecting surface 22 is configured to be at least partially connected to a second connecting surface 23 of the second profile 2.
The first connecting surface 22 comprises a connecting area 24, which is configured to be welded to a second connecting surface 23 defined by the front ends of walls 25 delimiting hollow chambers 26 inside the second profile 2. The connecting area 24 mirrors the second connecting surface 23.
In the preferred embodiment shown in Figures 6-8, the connecting area 24 has substantially a horseshoe shape.
By increasing the area of the first connecting surface 22 of the secondary portion 32, it is possible to compensate for local higher stresses at the miter joint 6 caused by a smaller cross section of the second profile 2.
Advantageously, by increasing the extent of the first connecting surface 22, local stresses around the weld seam are reduced.
Still advantageously, the solution for joining dissimilar profiles is at least as strong as a welded corner with two sashes.
Advantageously, the disclosed solution provides an increased weld contact area, which improves angular and torsional rigidity with respect to a cap of the state of the art connected by a screw.
The secondary portion 32 comprises a first transverse protrusion 34a which is configured to abut against an abutment surface 14 of the first profile 1 and to form a continuous surface with an outer surface 15 of the first profile 1 when the primary portion 31 is inserted in the cavity 4 of the first profile 1.
The first transverse protrusion 34a extends longitudinally along the longitudinal direction Y'. The first transverse protrusion 34a is connected to the first connecting surface 22.
Preferably, when the first profile 1 and the second profile 2 are joined together, the first transverse protrusion 34a forms a continuous surface with an outer surface 16 of the second profile 2, as visible from Figure 1.
Preferably, the secondary portion 32 comprises a second transverse portion 34b, extending along the direction Z. More preferably, the second transverse portion 34b faces one of first couple of sides 39a of the primary portion 31.
Preferably, when the corner piece 3 is inserted into the cavity 4, the second transverse portion 34b is configured to abut against the wall 43 of the first profile at the first connection end 11.
Still preferably, in an alternative embodiment, the second transverse portion 34b is a snap fitted to the wall 43 at the first connection end 11.
A window system 5 comprises a first profile 1, a second profile 2 and a corner piece 3. The corner piece 3 is configured to connect the first profile 1 to the second profile 2 in a miter joint 6.
While the invention has been described hereinabove with reference to specific embodiments, this was done to clarify and not to limit the invention, the scope of which is defined by the accompanying claims.

Claims

A method of joining
- a first profile (1), having a first connection end (11), and

- a second profile (2), having a second connection end (21), finished at a 45 degree angle relative to its longitudinal direction (Y);

- whereby the first profile (1) and the second profile (2) have a different cross-section;
the method comprising:
- providing a corner piece (3) comprising a primary portion (31) and a secondary portion (32), whereby the secondary portion (32) extends substantially perpendicularly to the primary portion (31) , whereby the first connection end (11) is configured to adhere to the primary portion (31);

- inserting the primary portion (31) into a cavity (4) at the first connection end (11) of the first profile (1); and

- connecting a first connecting surface (22) of the secondary portion (32) with a second connecting surface (23) at the second connection end (21) of the second profile (2), whereby the first connecting surface (22) and the second connecting surface (23) form a miter joint (6).
The method according to claim 1, wherein the first profile (1) and the second profile (2) are made of PVC.
The method according to claim 1 or claim 2, further comprising gluing the primary portion (31) into the cavity (4) of the first profile (1) via an opening (41).
The method according to any of the preceding claims, wherein said connecting comprises welding the second profile (2) to the secondary portion (32).
The method according to claim 4, further comprising welding by means of a seamless welding machine.
The method according to claim 4, further comprises polishing a weld burr created between the first profile (1) and the second profile (2) during said joining by means of a mirror welding machine.
A corner piece (3), comprising:
- a primary portion (31) configured to be inserted into a cavity (4) of a first profile (1) via an open end (13) at a first connection end (11) of said first profile (1), whereby the first connection end (11) is configured to adhere to the primary portion (31); and

- a secondary portion (32) extending substantially perpendicularly to said primary portion (31);

- wherein said secondary portion (32) comprises a first connecting surface (22) forming a 45 degree angle with respect to the longitudinal direction (X') of the primary portion (31), said first connecting surface (22) being configured to be at least partially connected to a second connecting surface (23) of a second profile (2).
The corner piece (3) according to claim 7, made of a polymeric material.
The corner piece (3) according to claim 7 or claim 8, wherein the primary portion (31) comprises an attachment surface (33) extending along the longitudinal direction (X') of the primary portion (31), configured to be glued to a surface (42) of a wall (43) delimiting the cavity (4) of the first profile (1).
The corner piece (3) according to any of claims from 7 to 9, wherein the first connecting surface (22) comprises a connecting area (24), configured to be welded to a second connecting surface (23) defined by the front ends of walls (25) delimiting hollow chambers (26) inside said second profile (2), wherein said connecting area (24) mirrors said second connecting surface (23).
The corner piece (3) according to any of claims from 7 to 10, wherein the secondary portion (32) comprises a first transverse protrusion (34a) configured to abut against an abutment surface (14) of the first profile (1) and to form a continuous surface with an outer surface (15) of the first profile (1) when the primary portion (31) is inserted in the cavity (4) of the first profile (1).
The corner piece (3) according to any of claims from 7 to 11, wherein the secondary portion (32) comprises a second transverse portion (34b)configured to abut against a wall (43) of the first profile (1) at the first connection end (11).
The corner piece (3) according to any claims from 7 to 12, wherein the primary portion (31) comprises a first set of features (35) extending along the longitudinal direction (X') configured to be coupled with a second set of features (45) in the cavity (4) extending along the longitudinal direction (X).
The corner piece (3) according to claim 13, wherein the first set of features (35) comprises a plurality of grooves (35a) and/or ridges (35b) extending along the longitudinal direction (X') and the second set of features (45) comprises respective ridges (45a) and grooves (45b) extending in the cavity (4) of the first profile (1) .
A window system comprising a first profile (1), a second profile (2), and a corner piece (3) according to any of claims 7-14, the corner piece (3) being configured to connect the first profile (1) to the second profile (2) in a miter joint (6).