WO2022130426A1

WO2022130426A1 - Partition wall structure

Info

Publication number: WO2022130426A1
Application number: PCT/IT2021/050347
Authority: WO
Inventors: Adriano SORDI
Original assignee: Merotto Milani Srl
Priority date: 2020-12-18
Filing date: 2021-10-26
Publication date: 2022-06-23
Also published as: EP4263965A1; IT202000031406A1

Abstract

The invention to which this patent application refers relates to a partition wall structure comprising a load-bearing frame containing within the relative thickness a set of profiles appropriately made so as to allow the construction of a high-performance structure in terms of technical performance, modularity and aesthetic effect as well as the possibility of customising the finishes. 5

Description

Title "Partition wall structure

DESCRIPTION

The invention to which this patent application refers relates to a partition wall structure comprising a load-bearing frame containing within the relative thickness a set of profiles appropriately made so as to allow the construction of a high-performance structure in terms of technical performance, modularity and aesthetic effect as well as the possibility of customising the finishes.

State of the art

In known solutions a partition wall comprises an outer frame, a partition panel, a set of partition panel retaining profiles and a set of gaskets or seals. Typically the outer frame is the supporting structure, basically consisting of a quadrilateral having the dimensions of the partition wall to be constructed; the vertical sides of the quadrilateral that forms the outer frame basically represent the height of the partition wall, which corresponds to the distance between the floor on which the wall rests and the ceiling above. The horizontal sides of the quadrilateral that forms the outer frame correspond in length to the length of the partition wall to be constructed.

Typically the outer frame is rigid and non-deformable because it has the task of supporting in all safety the partition panel and, for this reason, is made with profiles having a high moment of inertia. The section of the outer frame profiles is hollow and is normally the same both for vertical and horizontal segments. Typically the profile ends are mitred at 45° to allow the creation of four 90° angles which make up the quadrilateral. The vertical and horizontal elements are joined using diverse technologies depending on the dimensions and the materials. Mounting brackets/corner cleats are often used on outer frames for partition walls, i.e. additional elements that allow the 90° assembly of the profiles forming the frame. The use of such additional elements results in a sturdy, long-lasting corner joint, but the space where the profiles join remains visible, in other words the so-called "gap" remains visible. Typically the partition panel is the element that fills the outer frame and basically consists of a quadrangular shape in aluminium covered in the most diverse materials, according to aesthetic requirements.

Outer frame and partition panel must, consistent with the single technical characteristics (e.g. expansion, tolerances...) become a single unit so as to guarantee strength, acoustic capacity, sturdiness and safety.

Typically the partition panel is secured to the frame and held in position by the use of fastening systems hidden by retaining profiles that are installed once the partition panel is positioned. Typically these elements are also the external and visible completion of the outer frame and perform an aesthetic function for the assembled unit. If a glass partition panel is used, the retaining profiles are called "glazing bead". In known solutions, expansion and geometric imperfections are offset by the use of gaskets/seals, which, during assembly, are placed both between the building structure - floor, ceiling, lateral walls - and the outer frame and between the outer frame and the partition panel.

Known partition walls therefore typically have an outer frame and a retaining profile that both jut out from the surface on which the partition panel rests, being particularly impactful from an aesthetic point of view, or an outer frame and a retaining profile with ends joined at 45° with evidence of junction points due to tolerances or imprecisions, or an outer frame with ends joined at 45° and a retaining profile with ends joined at 0° with resulting anti-aesthetic crossing over of joints/gaps on different levels and impairment of the geometric rationality of the system.

In known solutions the performance required for the described type of partition walls is that of allowing the construction of a "wall system" that meets requirementsof versatility and adaptability, but also fulfils performance in terms of sound insulation.

Known solutions as of today, in fact, comprise solely solutions made according to the logics of economies of scale, significantly limiting the aesthetic appearance and the acoustic performance of the final results.

Furthermore, known systems as of today do not comprise solutions that allow the frame, retaining profile and partition panel to be coplanar or allow the possibility of easy replacement of the latter as and when needed, such as, by way of example but not limited thereto, for any repairs due to breakage or reorganisation of spaces. The aim and object of the invention to which this patent application refers is to construct a partition wall that has no protrusions between the outer frame/retaining profiles and partition panel combination, and is aesthetically effective in that it lacks the typical visible gaps at the four outer corners.

Another object of the invention to which this patent application refers is to construct a partition wall that complies with the requirements under voluntary and mandatory regulations concerning sound insulation performance. Another object of the invention to which this patent application refers is to construct a partition wall that is aesthetically effective, in particular with regard to the creation of a coplanar effect of the surface of the constituent elements. A further object of the invention to which this patent application refers is to construct a partition wall that can be customised from an aesthetic point of view according to the end user's requirements.

This and other objects will be achieved through the partition wall thus constructed as per the description and the claims and as is shown in the accompanying drawings.

The invention to which this patent application refers is illustrated in the accompanying drawings wherein

Fig 1: Graphic illustration of a method of attaching the partition wall structure (30), invention to which this patent application refers, to floor, ceiling and lateral connecting wall;

Fig 2: View of the outer frame to which finishing elements are attached according to the invention to which this patent application refers;

Fig 3: View of the outer frame combined with a generic panel;

Fig 4: View of the outer frame combined with a glass panel in a preferred embodiment;

Fig 5: Illustration of the finishing elements attached to the lower corner of the frame of the partition wall (30), invention to which this patent application refers;

Fig 6: View of the external face of the retaining 'L' bracket;

Fig 7: View of the internal face of the retaining 'L' bracket;

Fig 7a: Detail of the internal face of the retaining 'L' bracket;

Fig 8: External overall view of the retaining 'L' bracket and the vertical and horizontal retaining profiles;

Fig 8a: View of the external surface of the vertical retaining profile;

Fig 8b: View of the internal surface of the vertical retaining profile;

Fig 8c: Section of the vertical retaining profile;

Fig 9: Internal overall view of the retaining 'L' bracket and the vertical and horizontal retaining profiles;

Fig 9a: View of the external surface of the vertical retaining profile;

Fig 9b: View of the internal surface of the vertical retaining profile;

Fig 9c: Section of the vertical retaining profile;

Fig 10 - Example of method of attachment of retaining profile;

Fig 11 - Graphic illustration of the panel according to the invention to which this patent application refers;

Fig 12: Example of method of attachment of retaining profile; Fig 13: Example of a preferred embodiment of the system to which this patent application refers.

Detailed description

With reference to the accompanying drawings, the partition wall structure (30, Fig 1), constructed according to the invention to which this patent application refers, comprises an outer frame (I, Fig 2) consisting of a pair of elements (1.1.1,1.1.2, Fig 2) that are vertical in relation to the supporting surface (V, Fig 1) and a pair of elements (1.1.3, 1.1.4, Fig 2) that are horizontal in relation to the supporting surface (V, Fig 1) having the same section, which form a basically quadrangular shape whose perimeter corresponds to the frame (I) and to which at least one panel (II, Fig 1) is attached, said structure (30, Fig 1) being suitable for installation, by way of example but not limited thereto, onto a floor (V, Fig 1), a ceiling (VI, Fig 1) and at least one lateral connecting wall (VII).

In a preferred but not exclusive embodiment, the pair of vertical elements (1.1.1,1.1.2, Fig 2) and the pair of horizontal elements (1.1.3, 1.1.4) are made in such a way as to accommodate a pair of partition panels suitably distanced to create an internal space or gap which, if needed, may contain sound-absorbing or heat-insulating material or other functional elements, such as, by way of example but not limited thereto, manual or motorised sun blinds or decorative elements.

Irrespective of the preferred embodiments, each element making up the outer frame (I, Fig 2) has such characteristics of function and shape at the ends as to allow the use of typical mounting brackets/corner cleats in accordance with known techniques and therefore not shown in the accompanying drawings since they are irrelevant for understanding the new features of the invention to which this patent application refers.

According to the invention to which this patent application refers, a vertical retaining profile (XII.1, Fig 5) is attached to each vertical element (1.1.1,1.1.2) of the outer frame (I) and a horizontal retaining profile (XII.2, Fig 5) is attached to each horizontal element (1.1.3, 1.1.4) of the outer frame (I).

According to the invention to which this patent application refers, the ends of each vertical retaining profile (XII.1, Fig 5) and the ends of the corresponding horizontal retaining profiles (XII.2, Fig 5) are joined by means of a retaining 'L' bracket (XIII, Fig 5) to obtain a perfectly coplanar finish of the outer frame (I).

With reference to Fig 6, Fig 7 and Fig 7a, according to the invention to which this patent application refers, each retaining 'L' bracket (XIII) basically consists of an element with an external lateral face (XIII. A, Fig 6) and an internal lateral face (XIII. B, Fig 7,7a), said element having an "L" shape with a first and second branches (rl,r2) wherein the first branch (rl) lies parallel to the plane of development of the horizontal element (1.1.3, 1.1.4) of the outer frame (I) and the second branch (r2) lies parallel to the plane of development of the vertical element (1.1.1;1.1.2) of the outer frame (I).

In a preferred but not exclusive embodiment, at least one through hole (14.1,14.n) is made on the surface of each retaining 'L' bracket (XIII).

With reference to Fig 7, 7a, the free upper edge of the second branch (r2) has a rebate (13.2), which runs longitudinally for the entire length of said free upper edge, said rebate (13.2) in turn consisting of a horizontal part, which runs for the entire length of the free upper edge of the second branch (r2) and a vertical part, said horizontal and vertical part forming a sort of step on the inside of the free edge of the second branch (r2).

A dowel (13.2.1) is found in the horizontal part of the longitudinal rebate (13.2).

In a preferred but not exclusive embodiment, the dowel (13.2.1) is positioned centrally in relation to the length of the upper edge (13.2).

With reference to Fig 7 and Fig 7a, the free internal edge of the first branch (rl) parallel to the plane of development of the horizontal element (1.1.3, 1.1.4) of the outer frame (I) has a rebate (13.1), which runs longitudinally for the entire length of the free edge of the first branch (rl), said rebate (13.1) in turn consisting of a horizontal part, which runs for the entire length of the free edge of the first branch (rl), and a vertical part, said horizontal and vertical part forming a sort of step on the inside of the free edge of the first branch (rl). A dowel (13.1.1) is found in the horizontal part of the longitudinal rebate (13.1).

In a preferred but not exclusive embodiment, the dowel (13.1.1) is positioned centrally in relation to the length of the upper edge (13.1).

With reference to Fig 7 and 7a, according to the invention to which this patent application refers, the free upper surface (r.1.1) of the first branch (rl), which lies parallel to the plane of development of the horizontal element (1.1.3, 1.1.4), is sloping in relation to the plane of development of the upper edge of the second branch (r2).

In particular, the free upper surface (r.1.1) of the first branch (rl) slopes down from the external surface (XI ILA) to the internal surface (XII I.B) of the retaining bracket (XIII).

With reference to the accompanying drawings and in particular Fig 8 and Fig 9, according to the invention to which this patent application refers, each retaining 'L' bracket (XIII) engages the free ends of the first and second branches (rl,r2) to the end of a horizontal retaining profile (XI 1.2) and the end of a vertical profile (XII.1) respectively. With reference to Fig 8, 8a, 8b, 8c and Fig 9, the vertical retaining profile (XII .1) consists of a basically trapezoidal rectangular-section element, having a free flat surface (XI 1.1. A) and an internal surface (XII. l.B, Fig 8b) attached to the vertical element (1.1.1,1.1.2) of the outerframe (I), and of two lateral surfaces (XII. l.D; XII. l.C, Fig 8c).

In particular, a first lateral surface (XII. l.D) of the vertical retaining profile (XII.1) is sloping in relation to the plane of development of the second lateral surface (XII. l.C) thereby creating a tapered internal surface (XII. l.B) of the vertical retaining profile (XII.1).

According to the invention to which this patent application refers, the ends of the vertical retaining profile (XII.1) have a rebate (12.1, Fig 8) which runs longitudinally for the entire span of the end of the vertical retaining profile (XII.1), said rebate (12.1, Fig 8) in turn consisting of a horizontal part, which runs for the entire span of the end of the vertical retaining profile (XII.1), and a vertical part, said horizontal and vertical part forming a sort of step on the inside of the end of the vertical retaining profile (XII.1).

The vertical part of the longitudinal rebate (12.1, Fig 8,9) has a slot (12.1.1, Fig 8,9).

In a preferred but not exclusive embodiment, the slot (12.1.1, Fig 8,9) is positioned centrally in relation to the span of the end of the vertical retaining profile (XII.1).

In a preferred but not exclusive embodiment, the surface of each vertical retaining profile (XII.1) has at least one through hole (14. n, Fig 12).

With reference to Fig 8, Fig 9 and Fig 9a, 9b, 9c, the horizontal retaining profile (XII.2) consists of a basically trapezoidal rectangular-section element, having a free flat surface (XII.2.A) and an internal surface (XII.2. B) attached to the horizontal element (1.1.3, 1.1.4) of the outer frame (I), and of two lateral surfaces (XII.2. D; XII.2. C).

In particular, a first lateral surface (XII.2. D) of the horizontal retaining profile (XII.2) is sloping in relation to the plane of development of the second lateral surface (XII.2. C) thereby creating a tapered internal surface (XII.2. B).

According to the invention to which this patent application refers, the degree of inclination of the free surface (r.1.1) of the first branch (rl) of the retaining 'L' bracket (XIII) is equal to the degree of inclination of the first lateral surface (XII.2. D) of the horizontal retaining profile (XII.2).

According to the invention to which this patent application refers, the ends of the horizontal retaining profile (XII.2) have a rebate (12.2, Fig 8) which runs longitudinally for the entire span of the end of the horizontal retaining profile (XII.2), said rebate (12.2, Fig 8) in turn consisting of a horizontal part, which runs for the entire span of the end of the horizontal retaining profile (XII.2), and a vertical part, said horizontal and vertical part forming a sort of step on the inside of the end of the vertical retaining profile (XI 1.2).

The vertical part of the longitudinal rebate (12.2) has a slot (12.2.1, Fig 9). In a preferred but not exclusive embodiment, the slot (12.2.1) is positioned centrally in relation to the span of the end of the horizontal retaining profile (XII.2).

With particular reference to Fig 8 and Fig 9 and Fig 10, each retaining 'L' bracket (XIII) and the vertical retaining profile (XII.1) are joined by insertion of the vertical part of the rebate (13.2) found on the free surface of the second branch (r2) of the retaining 'L' bracket (XIII), into the horizontal part of the rebate (12.1) found on the end of the vertical retaining profile (XII.1) and by insertion of the dowel (13.2.1) of the retaining bracket (XIII) into the slot (12.1.1) of the vertical retaining profile (XII.1).

With reference to Fig 8, Fig 9 and Fig 10, each retaining 'L' bracket (XIII) and the horizontal retaining profile (XXI.2) are joined by insertion of the vertical part of the rebate (13.1) found on the free surface of the first branch (rl) of the retaining 'L' bracket (XIII) into the horizontal part of the rebate (12.2) found on the end of the horizontal retaining profile (XII.2) and by insertion of the dowel (13.1.1) of the retaining bracket (XIII) into the slot (12.2.1) of the horizontal retaining profile (XII.2).

Once assembled, the elements, made according to all that is described, form an inclined supporting surface inside the outer frame (I), created from the taper of the internal lateral surface (XII. l.D) of each vertical retaining profile (XII.1) and from the taper of the internal lateral surface (XII.2. D) of each horizontal retaining profile (XII.2).

According to the invention to which this patent application refers, the attachment of each 'L' bracket (XIII), made according to all that has been described hereabove, to the corresponding retaining profiles (XII.1, XII.2), made according to all that has been described hereabove, allows the resulting structure to achieve a coplanar condition externally.

With reference to Fig 11, with appropriate perimeter processing of the panel (II) a perimeter surface will be obtained that is also tapered, in other words having an additional inclination in relation to the inclination of the vertical (XII.1) and horizontal (XII.2) retaining profiles. Consequently, once the panel (II), made according to all that is described, has been attached onto the envisaged inclined supporting surface made by joining the vertical (XII.1) and horizontal (XII.2) retaining profiles by means of retaining 'L' brackets (XIII), a coplanar system of outer frame (I), panel (II), vertical retaining profiles (XII.1), horizontal retaining profiles (XII.2) and retaining 'L' brackets (XIII) materialises, creating the structure as shown, by way of example but not limited thereto for all that concerns the finish of the panel, in Fig 3.

Any longitudinal adjustments that may prove necessary, may be accomplished by using appropriate devices, by way of example but not limited thereto, alignment pins.

According to the invention to which this patent application refers, the structure made by joining the vertical and horizontal retaining profiles (XII.1, XII.2) to the outer frame (I) and the joining of the same to the 'L' brackets (XIII), is not only perfectly coplanar but allows two longitudinal grooves suitable for holding the edges of at least one panel (II) to be created.

In a preferred but not exclusive embodiment, each vertical and horizontal retaining profile (XII.1, XII.2) is sized so that the overall width, obtained by adding the thickness of the frame (I) and the thickness of the two retaining profiles (XII.1, XII.2) is equal to the overall thickness of the assembly of a first partition panel (II), gap and a second partition panel (II).

The height of each vertical and horizontal retaining profile (XII.1, XII.2) is such as to hide almost fully the height of the outer frame (I) to which it is attached by means of generic devices. With reference to Fig 10, Fig 12, in a preferred but not exclusive embodiment, each vertical and horizontal retaining profile (XII.1, XII.2) is joined to the outer frame (I) by means of washers suitable for compensating tolerances and for hiding processing imperfections.

In particular, in a preferred but not exclusive embodiment, each 'L' bracket (XIII) is firmly joined to the corresponding retaining profiles (XII.1, XII.2) and each vertical and horizontal retaining profile (XII.1, XII.2) is joined to the outer frame (I) by insertion of at least one screw (XIX, Fig 10,12), preferably but not exclusively a flat head screw, into at least one through hole (14. n, Fig 10,12) to be found on each 'L' bracket (XIII) and on each vertical and horizontal retaining profile (XII.1, XII.2). With reference to Fig 10, in a preferred but not exclusive embodiment, at least one through hole (14. n) has a detent obtained by means of double drilling (counterboring), one cavity made with a larger diameter and one with a smaller diameter.

In particular, the drilling with larger diameter is carried out to a depth less than the thickness of the 'L' bracket (XIII) or of the vertical or horizontal retaining profile (XII.1, XII.2) in order to obtain a hole with double diameter. According to the preferred method of attachment, an antifriction ring (XX, Fig 10,12) is inserted between the flat head of the screw and the counterbore hole, which allows a certain degree of offset between screw and thread allowing any finishing defects to be covered.

The partition wall structure, made according to all that has been described hereabove, allows the construction of a single element (Fig 1,2, 3,4) or the construction of a combination of partition walls (30) made according to all that is described, in combination with other elements, by way of example but not limited thereto, doors (VII, Fig 13).

Irrespective of the preferred construction method of the partition wall structure (30) to which this patent application refers or the possible combinations of more than one partition wall (30) made according to all that is described, the partition wall structure (30) made according to all that is described allows the above described objects to be achieved, in particular a structure that has an outer frame that is perfectly coplanar with the panel within whose internal thickness it is possible to insert supporting elements such as, by way of example, hinges or locks and which, at the same time, is aesthetically effective and customisable with regard to finishing elements such as, by way of example but not limited thereto, decorated panels or internal blind or other.

Claims

CLAIMS ) Partition wall structure (30) comprising at least one panel (II) housed in an outer frame (I), said outer frame (I) consisting of a pair of vertical elements (1.1.1,1.1.2) to which a pair of vertical retaining profiles (XII.1) are associated, each one consisting of a trapezoidal element with a flat surface (XII. l.A), an internal surface (Xll.l.B) attached to the corresponding vertical element (1.1.1,1.1.2), a first lateral surface (XXL1.C) and a second lateral surface (XII. l.D) internal in relation to the centre of the outer frame (I) ; a pair of cross elements (1.1.3, 1.1.4) to which a pair of cross retaining profiles (XII.2) are associated, each one consisting of a trapezoidal element with a flat surface (XII.2.A), an internal surface (XII.2. B), a first lateral surface (XII.2.D) internal in relation to the centre of the outer frame (I) and a second lateral surface (XII.2. C) external in relation to the centre of the outer frame (I), said structure (30) wherein: the ends of each vertical retaining profile (XII.1) and the end of the corresponding cross retaining profile (XII.2) are joined by means of a retaining 'L' bracket (XIII), said retaining 'L' bracket (XIII) consisting of an element with an external lateral face (XIII. A) and an internal lateral face (XIII. B), said element having an "L" shape with a first and a second branches (rl,r2), said first branch (rl) which lies parallel to the plane of development of the cross element (1.1.3, 1.1.4) of the outer frame (I) and said second branch (r2) which lies parallel to the plane of development of the vertical element (1.1.1;1.1.2) of the outer frame (I); the first branch (rl), which lies parallel to the plane of development of the cross element (1.1.3, 1.1.4), presents a free upper surface (r.1.1) that is sloping in relation to the plane of development of the upper edge of the second branch (r2); the internal lateral surface (XII. l.D) of the vertical retaining profile (XII.1) is sloping; the internal lateral surface (XII.2. D) of the cross retaining profile (XII.2) is sloping; the angle of inclination of the free upper surface (r.1.1) of the branch (rl) is equal to the angle of inclination of the internal lateral surface (XII.2. D) of the cross retaining profile (XII.2); the perimeter surface of at least one panel (I) is tapered. ) Structure, according to claim 1, wherein the free upper edge of the branch (r2) presents a rebate (13.2) which runs longitudinally for the entire length of the free edge of the branch (r2), said rebate (13.2) in turn consisting of a horizontal part, which runs for the entire length of the free edge of the branch (r2) and a vertical part, said horizontal and vertical part forming a sort of step on the inside of the free edge of the branch (r2). ) Structure, according to the preceding claims, wherein a dowel (13.2.1) is found in the horizontal part of the longitudinal rebate (13.2). ) Structure, according to the preceding claims, wherein the dowel (13.2.1) is positioned centrally in relation to the length of the upper edge (13.2). ) Structure, according to the preceding claims, wherein the free internal edge of the branch (rl) has a rebate (13.1) which runs longitudinally for the entire length of the free edge of the branch (rl), said rebate (13.1) in turn consisting of a horizontal part, which runs for the entire length of the free edge of the branch (rl), and a vertical part, said horizontal and vertical part forming a sort of step on the inside of the free edge of the branch (rl). ) Structure, according to the preceding claims, wherein a dowel (13.1.1) is found in the horizontal part of the longitudinal rebate (13.1). ) Structure, according to the preceding claims, wherein the dowel (13.1.1) is positioned centrally in relation to the length of the upper edge (13.1). ) Structure, according to the preceding claims, wherein the ends of the vertical retaining profile (XII.1) have a rebate (12.1), which runs longitudinally for the entire length of the end of the vertical retaining profile (XII.1), said rebate (12.1) in turn consisting of a horizontal part, which runs for the entire length of the end of the vertical retaining profile (XII.1), and a vertical part, said horizontal and vertical part forming a sort of step on the inside of the end of the vertical retaining profile (XII.1). ) Structure, according to the preceding claims, wherein the vertical part of the longitudinal rebate (12.1) has a slot (12.1.1). 0) Structure, according to the preceding claims, wherein the slot (12.2.1) is positioned centrally in relation to the length of the end of the cross retaining profile (XII.2). 1) Structure, according to the preceding claims, wherein the ends of the cross retaining profile (XII.2) have a rebate (12.2), which runs longitudinally for the entire length of the end of the cross retaining profile (XII.2), said rebate (12.2) in turn consisting of a horizontal part, which runs for the entire length of the end of the horizontal retaining profile (XII.2), and a vertical part, said horizontal and vertical part forming a sort of step on the inside of the end of the vertical retaining profile (XII.2). ) Structure, according to the preceding claims, wherein the vertical part of the longitudinal rebate (12.2) has a slot (12.2.1). ) Structure, according to the preceding claims, wherein the slot (12.2.1) is positioned centrally in relation to the length of the end of the cross retaining profile (XII.2). ) Structure, according to the preceding claims, wherein each retaining 'L' bracket (XIII) and the vertical retaining profile (XII.1) are joined by insertion of the vertical part of the rebate (13.2) on the free surface of the branch (rl) of the retaining 'L' bracket (XIII) into the horizontal part of the rebate (12.1) found on the end of the vertical retaining profile (XII.1) and by insertion of the dowel (13.2.1) of the retaining 'L' bracket (XIII) into the slot of the vertical retaining profile (XII.1). ) Structure, according to the preceding claims, wherein each retaining 'L' bracket (XIII) and the cross retaining profile (XXI .2) are joined by insertion of the vertical part of the rebate (13.1) on the free surface of the branch (rl) of the retaining 'L' bracket (XIII) into the horizontal part of the rebate (12.2) found on the end of the cross retaining profile (XII.2) and by insertion of the dowel (13.1.1) of the retaining 'L' bracket (XIII) into the slot of the cross retaining profile (XII.2). ) Structure, according to the preceding claims, wherein each vertical retaining profile (XII.1) and each cross retaining profile (XII.2) and each 'L' bracket (XIII) has at least one through hole (14. n). ) Structure, according to the preceding claims, wherein each 'L' bracket (XIII) is joined to the corresponding retaining profiles (XII.1, XII.2) by inserting at least one screw (XIX) into at least one through hole (14. n) found on each 'L' bracket (XIII). ) Structure, according to the preceding claims, wherein each vertical and cross retaining profile (XII.1, XII.2) is joined to the outer frame (I) by inserting at least one screw (XIX) into at least one through hole (14. n) found on each 'L' bracket (XIII) and on each vertical and cross retaining profile (XII.1, XII.2)