WO2008084129A2

WO2008084129A2 - Method and machine for manufacturing closures for door leaves, windows and wall coverings and resulting closure

Info

Publication number: WO2008084129A2
Application number: PCT/ES2008/000008
Authority: WO
Inventors: Francisco Fernández Iglesias
Original assignee: Fernandez Iglesias Francisco
Priority date: 2007-01-11
Filing date: 2008-01-10
Publication date: 2008-07-17
Also published as: EP2103772A4; WO2008084129A3; ES2285951B1; ES2285951A1; EP2103772A2

Abstract

A closure, a method for manufacturing said closure and machine for manufacturing said closure for Mallorcan-style door leaves, windows and wall coverings,consisting of one or more metal panels (1) having longitudinal alternated grooves (2) each comprising a first wall (3), a second wall (4) and a base (5) connecting same (3-4) and parallel to the plane of the panel, said base (5) at an acute angle α to the first wall (3) and an obtuse angle γ to the second wall (4). In the second positions (10-10' -10' '...10n) of rollers (11-11'-11''... 11m) of the machine, the angle β formed between the axes (14-14' -14''... 14n) of revolution of each of the rollers (11-11'-11''... 11n)) and the rotational axis (15-15' -15'... 15n) of each of the second stations (10-10' -10' '...10n) is equal to 90- α.

Description

PROCEDURE AND MACHINE FOR THE MANUFACTURE OF CLOSURES

FOR DOORS, WINDOWS AND WALL COATINGS AND CLOSURE PRODUCED THROUGH THE SAME

Field of the Invention

The present invention relates to a method and a machine for the manufacture of Mallorcan type enclosures, manufactured by a continuous process, which is intended for the formation of door and window sheets and wall surface coverings, especially exterior walls and also refers to the enclosure produced by said procedure and said machine.

Background of the invention Los. Enclosures of the so-called "Mallorcan" type _t, whatever its application, are composed of independent shaped slats, which are mounted between the vertical sides of a frame. The slats are arranged with a certain transverse inclination and separated a certain distance, to define between them ventilation openings.

The constitution commented requires the conformation and assembly of the slats one by one. If the slats are made of aluminum, their fixing to the frame is usually done by screwing, while if the slats are made of steel and also the frame, the fixing is usually done by welding. In both cases, the assembly can also be carried out by means of slats or stamped tubes. In any case, the assembly and fixing of the slats must be done one at a time, which requires a high labor time. On the other hand, the traditional Mallorcan-type closures offer a relatively small closing security, since the disassembly of one or two slats may be possible totally or partially, although by violent methods, and thereby allow access through the gap obtained. Another possible manufacturing process for an enclosure with a similar utility, it could be through successive stages of sheet bending, but in no case would any significant savings or advantage be achieved with respect to the current procedure.

Description of the invention

The present invention ^'to eliminate the problems described by a special constitution of the enclosure, Majorcan type, which allows a considerable reduction in assembly times and provides greater closure safety.

In accordance with the present invention, the method of manufacturing a enclosure, for door leaves, windows and wall coverings, of the Mallorcan type, whose enclosure is constituted on the basis of one or more metal panels having alternate longitudinal grooves, each of which comprises a first wall, a second wall and a bottom that joins the first and second walls being parallel to the plane of the panel, said bottom forming an acute angle ex with the first wall and an obtuse angle Y with the second wall, whose The process, starting from a coil of sheet metal arranged in a winder, comprises the following steps: a) .- flatten the sheet coming from the winding by deformation through a first roller station, b) .- punch the sheet resulting from stage a) by a mechanical press to which a plurality of dies are associated to practice a plurality of openings in the sheet that are grouped together to define strips of perforated sheet alternating with strips of unperforated sheet, c) .- profiling the sheet resulting from stage b) by a plurality of second consecutive roller stations to determine the grooves in the sheet, d) .- straighten the sheet obtained in the stage by means of a third mobile roller station e). -Cut the sheet into portions using a shear to determine a plurality of panels. In particular, the process object of the present invention is characterized in that the profiling stage c) is divided into defined sub-stages defined by each of the second roller stations, having a total number of second stations equal to any having each of they a number of rollers equal to m. In each of said sub-stages, the angle α of the grooves is gradually formed, which varies in amplitude from the first to the last of the second roller stations, from a value between 180 ° and 90 ° to the value final of I between 90 and 0 °, and said angle I was determined as a function of the angle β formed between the axes of revolution of each of the rollers and the axis of rotation of each of the second stations, there being a relationship between both of β = 90- I heard and also because from an intermediate roller station nk until the last n station the angle a. of the grooves becomes acute.

Therefore, the present process of manufacturing the enclosure has the particularity that it starts from sheet metal coils, to subsequently proceed to flattening, punching (microperforation or windows), profiling, straightening and cutting in a continuous process, that is, it does not start from slats already profiled individually and subsequently welded or screwed, or of any type of successive bends but that starts from a sheet coil and the different mechanical operations on said sheet occur sequentially and continuously during the manufacturing process of the Mallorcan.

Furthermore, by means of a continuous process object of the present invention, an angle α, defined by the bottom and the angle, is achieved by progressive roller profiling. first wall of each of the grooves defined in each panel, acute with respect to the plane of the panel oscillating its value between 0 and 90 °.

The number k may be between 1 and 6. On the other hand the number n of second stations may be between 5 and 100, the optimum number of second stations being 30.

As regards the number m of rollers of each of the second stations n, it may be between 1 and 20, the number of rollers being variable depending on the season.

For the second stations from the n-k to the station n the number m of rollers of each station may be the same and may also be equal to or greater than the number m of rollers in the stations prior to the second station n-k.

A second aspect of the invention relates to a machine for the manufacture of enclosures according to the procedure just detailed. Said machine is characterized in that in the n second stations of m rollers the angle β formed between the axes of revolution of each of the rollers and the axis of rotation of each of the n second stations is equal to 90- o: being a the angle formed between the first wall and the bottom of the grooves defended in the panels that constitute the enclosure. Furthermore, in said machine, from an intermediate roller station n-k to the last station n, the angle a of the grooves becomes acute.

The number k may be between 1 and 6.

On the other hand, the number n of second stations may be between 5 and 100, the optimum number of second stations being 30.

As regards the number m of rollers of each of the second stations n, it may be between 1 and 20, the number of rollers being variable depending on the season. For the second stations from nk to station n the number m of rollers of each station may be the same and may also be equal to or greater than the number m of rollers in stations prior to the second station nk. A third aspect of the invention relates to an enclosure consisting of one or more metal panels having alternating, consecutive and equal grooves. Each of these grooves is longitudinally limited by a first wall, a second wall and a bottom that joins the first and second walls being parallel to the plane of the panel, said bottom forming an acute angle a with the first wall and an angle Y obtuse with the second wall

The fact that the first wall forms an acute angle with respect to the bottom and in turn the second wall forms an obtuse angle with respect to said bottom of the grooves is of great importance since it causes the walls defining the grooves to be inclined in such a way with respect to the vertical that they act as a parapet or protection of the surface on which the panel or Mallorcan is installed (either on a wall or on a window, door, etc.) against rain, snow, etc. always ensuring optimal ventilation.

The panels are finished, along the edges parallel to the grooves, in flat strips that are overlapping on the adjacent edges of consecutive panels, to jointly shape the bottom of a groove.

Depending on the surface to be closed and the size of the panels, the enclosure will be achieved with a single panel or with more than one.

The enclosures with the constitution mentioned can be used to form sheets of doors and windows, in which case the panels will be mounted between the frame that limits the contour of the sheet. The enclosure can also be used to cover surfaces of walls or walls, preferably of exterior walls

Preferably the panels that make up the enclosure of the invention will be of a metallic nature, for example of steel, in which case the overlapping strips of panels, in the enclosures in which it reuses more than one panel, will be joined by welding. Also the union of these panels to the sides of the frame, which will consist of steel profiles, will be joined by welding.

The panels can also be made of aluminum, in which case the connection between consecutive panels and of these with the profiles of the frame will be done by screwing or riveting.

The panels can be totally blind or have openings in the first wall of the panel. In the first case, when the panels are blind, without ventilation openings, they will be intended for covering decorative facades, which do not need ventilation, but only veneer and protection sheet. When the panels have ventilation openings, they are preferably intended for the formation of door and window enclosures. The openings can adopt any configuration, preferably being equal in each panel, arranged in alignment in the commented wall of the grooves, in equidistant positions. The openings can be rectangular, oval, circular, microperforated, etc. Even the panels can adopt a trellis or mesh configuration, with rectangular, rhomboid, square, etc. contours, with openings aligned or distributed to the treble. With the constitution mentioned, considerable labor savings are achieved, since the enclosure will consist of a single panel or a small number of them, making the high number of fixing elements and operations necessary in Mallorcan-type enclosures unnecessary. traditional, based on independent slats.

With the closure of the invention, up to 80% savings in labor can be achieved, compared to traditional Mallorcan-type enclosures. On the other hand, the enclosure of the invention, based on the described panels, offers a total security of closure, since being the enclosure formed by a single panel or several panels joined together, does not allow its disassembly, as occurs with the loose slats that make up the traditional Mallorcan type enclosures.

When the panels that make up the enclosures are made of aluminum, in addition to labor savings, high savings are also achieved in auxiliary elements, such as bolts, holes, drills, cuts and trimmings of materials. When the panels are made of steel, the saving that is achieved is essentially in labor, since instead of having to go assembling and joining the slats one by one, the closing will be achieved through the provision of one or more panels, it is say one piece or a certain number of them, which will be welded to the sides of the frame.

The panels that make up the closure of the invention will preferably be rectangular in shape, with two opposite sides parallel to the grooves. These panels may have any dimension, to adapt to traditional measures of door and window frames, and also for the formation of wall and wall coverings.

Brief description of the drawings

The characteristics and advantages of the enclosure of the invention can be better understood with the following description, made with reference to the attached drawings, in which a non-limiting embodiment example is shown. In the drawings:

Figure 1 shows in perspective a enclosure constituted according to the invention. Figure 2 shows a profile view of one of the panels that becomes part of the enclosure of Figure 1.

Figure 3 corresponds to detail A of Figure 1, on a larger scale.

Figures 4 to 6 are views similar to Figure 2, showing variants of panel execution.

Figure 7 shows in perspective a phase of mounting the enclosure of the invention in a frame.

10 Figure 8 is a view showing the fully assembled frame.

Figure 9 shows in perspective the frame in the assembly phase, with the enclosure of the invention.

Figures 10 to 16 show different shapes and ^{'distributions} openings ^15' of the panel.

Figure 17 shows a diagram of the different components that are part of the machine and participate in the manufacturing process object of the present invention.

Figure 18 shows a diagram of one of the 20 final knee stations in the profiling stage of the manufacturing process object of the invention.

Brief detailed description of the drawings

25 Figure 1 shows an enclosure that is composed of a series of panels referenced with the numbers 1, 1 'and 1' ', all of them of equal width but of different length, with the central panel 1 being larger than the two other panels 1 'and 1' ', forming

30 together a enclosure whose dimensions corresponding to those of the surface to be covered, which may correspond to a door leaf, window or cover of a surface.

In figure 2 the central panel 1 is shown in profile, which, as can be seen, has grooves 2

35 longitudinal ones whose mouthpieces alternate and have consecutive way to determine a wavy profile. It can also be seen how each groove 2 comprises a first wall 3, a second wall 4 and a bottom 5 that joins the first and second walls 3-4 being parallel to the plane of the panel, said bottom 5 forming an acute angle ex with the first wall 3 and an angle Y obtuse with the second wall 4.

Preferably, the panels will be square or rectangular, with two opposite sides parallel to the 2-2 'grooves and at the edges parallel to said grooves they are finished off in stripes 16 and 16', one of which may have a slight conformation or longitudinal bankruptcy 20 which determines an end portion 21 that allows the overlapping of adjacent strips 16, 16 'corresponding to consecutive panels, as can be seen in greater detail in Figure 3, where thanks to said bankruptcy the strips 16 and 16' of panels I and I '' are perfectly overlapped throughout them. If the panels are made of steel, the strips 16 and 16 'can also be joined by welding. If the panels are made of aluminum, they can be joined by screws or riveted.

The panels that make up the enclosure of Figure 1, as can be best seen in Figure 2, have, along the first wall 3, equal and equidistant ventilation openings 17. These openings can be of rectangular contour, or of oval contour, as shown in figure 4. The panel can also have microperforations 17 ', as shown in figure 5.

The panels with the ventilation openings described will be destined to the formation of façade cladding, large surfaces, shopping centers, schools and hospitals, sports centers, industrial ventilation, canopies and parasols, luminaire enclosures, laundry and shopkeepers, gates and doors, shutters, protection bars, etc. Figure 6 shows a panel similar to that of Figures 2 and 4 but lacking openings, being especially intended for closing surfaces of walls or walls, since in this case ventilation will not be necessary. Otherwise, the panel of Figure 5 is the same as the panel of Figures 2 and 4, in terms of its structure and general configuration. The openings could have a different shape to that described with reference to figures 2 and 4, being able to be, for example, circular, polygonal with a number of sides smaller or greater than that of figures 2 and 4, etc.

On the contrary, different configurations of openings 17 are shown in figures 10 to 16 which, by way of trellis, can present the panels. In figure 10 the lattice takes the form of a mesh with openings 17 in rhombus, in figure 11 the openings 17 are distributed to the treadmill, while in figure 12 the openings 17 are aligned in rows and columns. In Figure 13 the openings 17 are square, obliquely aligned, while in Figure 14 such openings 17 are aligned in directions parallel to the panel bands.

In figures 15 and 16, capricious forms for the openings 17 are shown, giving definitive idea of the different forms and arrangements that the openings can take, within the general characteristics of the panel of the invention.

Figure 7 shows the formation of a sheet of a window, which is already completed in Figure 8, in which the enclosure is constituted by a single panel as described with reference to Figures 1 and 4.

The sides 22 of the window or door leaf frame may be of different profiles and each assembler will use its own marking. In the example of figure 7 the sides of the frame have a profile that determines a internal groove 23 sized to receive the edges of the panel, both parallel to the grooves 2 and the edges perpendicular to said grooves. In case the panel 1 and the sides 22 of the frame are made of steel, said panel can be joined to the profiles 22 by welding. In the case that both were made of aluminum, the connection can be made by screwing or riveting.

A final assembly phase is shown in Figure 9, with panel 1 arranged between three of the sides 224 of the frame and a fourth side 22 'to be fixed.

Figure 8 shows the fully assembled sheet, with the complete frame, leaving the edges of the panel 1 hidden and protected by the channel 23 (not visible) of the sides 22 of the frame. With the described constitution the formation of the sheet will require only the assembly of one or more panels between the sides 22 of the frame, in a single operation, and the fixing by welding or screwing, depending on the nature of the panel and profiles 22 of the frame. As can be seen, the assembly operations are considerably reduced, since it is not necessary to mount the slats one at a time, as in the traditional Mallorcan enclosures, but with the provision of a single panel or a certain number of them, the closing of the frame or the surface to be covered is achieved.

As can be seen in figure 3, the overlapping of the strips 16 and 16 'at the junction of consecutive panels 1 and 1' ', determines the bottom of one of the grooves, which will allow to maintain uniformity in all the grooves of the enclosure , although it is formed by two or more panels.

Figure 17 shows a schematic view of the machine used for the manufacture of the previously detailed enclosure, which is the subject of the present invention, as well as the procedure followed to manufacture the enclosure whose novelty lies in the profiling phase and in The constitution of the roller stations in said stage.

Normally to obtain panels 1 with grooves 2 that determine a series of undulations in the plane of the panel, procedures are used comprising the following steps: a) .- flatten the sheet from the winding 6 by deformation by a first station 8 of rollers, b) .- die cutting the sheet resulting from step a) by means of a mechanical press 9 to which a plurality of dies are associated to practice a plurality of openings in the sheet that are grouped together to define strips of perforated sheet alternating with strips of unperforated sheet, • c) -. - pexfilar the sheet resulting from step b) by means of a plurality of second stations 10-10 '-10 "... 10" of rollers 11-11' -11 '' ... 11 '"consecutive to determine the grooves 2 on the sheet, d) .- straighten the sheet obtained in step c) .- by a third mobile station 12 of rollers e).-cut the sheet into portions by means of a shear 13 to determine a plurality of panels 1 The object procedure of the present invention has an important novelty that mainly lies in that the profiling stage c) is divided into sub-stages el), c2) ... en) profiling defined by each of the second stations 10-10 '- 10 "... 10" of rollers 11-11 '-11 "... ll ^ln (see figure 18), being in each of said sub-stages the), c2) ... cn) formed the angle a of the progressive grooves, which vary in amplitude from the first 10 to the last 10 ⁿ of the second roller stations, from a value between 180 ° and 90 ° to the final value of α between 90 and 0 ^or , and said angle a as a function of angle β formed between axes 14-

14 '-14''... 14 ^m of revolution of each of the rollers lili' -11 "... ll ^m and the axis of rotation 15-15 '-15''...15" of each of the second stations 10-10 '-10''... 10 ", there being a relationship between both of β = 90- I heard and because from a second intermediate roller station 10 ^{n" k} until the last second station 10 ⁿ the angle α of the grooves becomes acute.

In figure 18 we can see one of the last second stations 10 ⁿ of rollers, which is constituted by a number m of rollers. As can be seen in said figure, axis 15 ⁿ of said second station is arranged in a horizontal direction. On the other hand, each of the rollers 11-11 '-11''... 11 ^m that are part of the mentioned second station have a free rotation with respect to the axis 15 thanks to two bearings, the axes being 14-14' - 14 '' ... 14 ^m of revolution of said inclined rollers with respect to the 15 ⁿ axis.

In a preferred embodiment of the invention, the number k is between I and 6, 1 ≤ k ≤ 6. On the other hand, the number n of second stations (10-10 '-10''... 10 ⁿ ) will be between 5 and 100, 5 ≤ n ≤ 100, with the optimal number n of second stations of 30. With regard to the number of rollers of each second station it will be variable depending on the station following the following conditions:

First, the number of rollers will never be greater than 20, the maximum maximum number of rollers being 11. Second, for the second stations between 10 ^{n "k} and 10 ⁿ the number m of rollers of each second station is the same and is equal to or greater than the number m of rollers in the second stations 10 to 10 ^{n "i:.}

Like the procedure, the machine used in the manufacture of the enclosure object of the present The invention is novel, based on its novelty in incorporating the number and shape of second profiling stations and the number and characteristics of the component rollers thereof, in accordance with what has just been detailed with respect to the procedure.

Claims

1. Procedure for the manufacture of an enclosure, for leaves of doors, windows and wall coverings, of the Mallorcan type, which is constituted based on one or more metal panels (1) that have alternating longitudinal grooves (2), each of which comprises a first wall (3), a second wall (4) and a bottom (5) that joins the first and second walls (3-4) being parallel to the plane of the panel, said bottom (5) forming an acute angle α with the first wall (3) and an obtuse angle Y with the second wall

(4), whose process starting from a sheet coil arranged in a winder (6) comprises the following steps: a) .- flatten the sheet coming from the winder (6) by deformation by a first roller station (8), b ) .- die cutting the sheet resulting from stage a) by means of a mechanical press (9) to which a plurality of dies are associated to practice a plurality of openings in the sheet that are grouped together to define strips of perforated sheet alternating with strips of unperforated sheet, c) .- profile the sheet resulting from stage b) by a plurality of second stations (10-10'- 10 '' ... 10 ") of rollers (11-11 '-11" .. . 11 '") consecutive to determine the grooves (2) in the sheet, d) .- straighten the sheet obtained in stage c) .- by a third mobile station (12) of rollers e).-Cut the sheet in portions by means of a shear (13) to determine a plurality of panels (1) characterized in that step c) of profiling or is divided into sub-stages el), c2) ... en) profiling defined by each of the second stations (10-10 '-10''... 10 ⁿ ) of rollers (11-11' - H '' ... ll ^m ), being in each of said sub-stages el), c2) ... cn) formed the angle a. of the grooves progressively, which varies in amplitude from the first (10) to the last (10 ⁿ ) of the second roller stations, from a value between 180 ° and 90 ° to the final value of ex between 90 and 0 ^o , and said angle a being determined as a function of the angle β formed between the axes (14-

14 '-14''... 14 ^m ) of revolution of each of the rollers

(ll-ll'-ll "... II ¹ ") ¹ and the axis of rotation (15-15 '-15 "... 15") of each of the second stations (10-10'-10''... 1O ¹¹ ), there being a relationship between both of β = 90-OI and because from a second intermediate roller station (10 ^{n ~} ^k ) until the last second station (10 ⁿ ) the angle α of the grooves becomes sharp.

2. Method of manufacturing a enclosure according to claim 1, characterized in that the number k is comprised between 1 and 6, 1 <k ≤ 6.

3. Method of manufacturing a enclosure according to claims 1 and 2, characterized in that the number n of second stations (10-10 '-10' '... 10 ") is between 5 and 100, 5 ≤ n <100 .

4. Method of manufacturing a enclosure according to claim 3, characterized in that the number n of second stations (10-10 '-10' '... 10 ") is 30, n = 30.

5. Method of manufacturing a enclosure according to claims 1 to 4, characterized in that the number m of rollers (ll-ll'-ll "... ll ^m ) is between 1 and 20, 1 <m <20.

6. Method of manufacturing a enclosure according to claim 5, characterized in that the number m of rollers (ll-ll'-ll "... ll ^m ) is from 1 to 11, the number of rollers being variable depending on the station.

7. Method of manufacturing a enclosure according to claims 5-6, characterized in that for the second stations between 10 ^r '^"k and 10 ⁿ the number m of rollers of each second station is the same and is equal or higher to the number m of rollers in the second stations 10 to 10 ^{n "k}

8. Machine for the manufacture of an enclosure according to the method of claim 1 to 5, characterized in that in the second stations (10-10 '-10''... 10 ⁿ ) of rollers (11-11'-H''... 11 ^ra ) the angle β formed between the axes (14-14'-14''... 14 ^m ) of revolution of each of the rollers (ll-ll'-ll "... 11 ^a ) ¹ and the axis of rotation (15-15 '-15''... 15 ⁿ ) of each of the second stations (10-10' -10 '' ... 10 ") is equal to 90- c Being a. the angle formed between the first wall (3) and the bottom (5) of the grooves (2) and because from a second intermediate roller station (10 ^{n ~} ^k ) until the last second station (10 ⁿ ) the angle α of the grooves becomes acute.

9. Machine for the manufacture of an enclosure according to claim 8, characterized in that the number k is between 1 and 6, 1 ≤ k ≤ 6.

10. Machine for the manufacture of an enclosure according to claim 9, characterized in that the number n of second stations (10-10 '-10''... 10 ⁿ ) is between 5 and 100, 5 <n ≤ 100.

11. Machine for the manufacture of an enclosure according to claim 10, characterized in that the number n of second stations (10-10 '-10' '... 10 ") is 30, n = 30.

12. Machine for the manufacture of an enclosure according to claims 8 to 11, characterized in that the number m of rollers (ll-ll'-ll "... ll ^m ) is between 1 and 20, 1 ≤ m ≤ 20.

13. Machine for the manufacture of an enclosure according to claim 12, characterized in that the number m of rollers (ll-ll'-ll "... 11 ^ra ) is from 1 to 11, the number of rollers being variable depending on the station.

14. Machine for the manufacture of an enclosure according to claim 12-13, characterized in that for the stations between station 10 " ^{~ k} and station 10" the number m of rollers of each second station is the same and is equal to or greater than the number m of rollers in the second stations 10 to 10 ^{n "k}

15.- Enclosure for door leaves, windows and wall coverings, of Mallorcan type manufactured by means of the procedure of claims 1 to 5, characterized in that it is constituted on the basis of one or more metal panels (1) having grooves (2) alternating, consecutive and equal, each of which is longitudinally limited by a first wall (3), a second wall (4) and a bottom (5) that joins the first and second walls (3-4) being parallel to the plane of the panel, said bottom (5) forming an acute angle a with the first wall

(3) and an obtuse angle with the second wall (4); whose panels are topped, along the edges parallel to the grooves, in flat strips (16> that are overlapped at the adjacent edges of consecutive panels (1), forming the bottom of a groove.

16. Enclosure according to claim 15, characterized in that the first wall (3) has, along it a plurality of openings (17).

17. Enclosure according to claim 16, characterized in that the first wall (13) has, along it, equal and equidistant openings (17).

18. Enclosure according to claim 15, characterized in that the first wall is provided with microperforations (18).

19. Enclosure according to claims 15 to 18, characterized in that the panels (1) are square or rectangular, with the grooves (2) running parallel to two opposite sides of said contour.

20. Enclosure according to claims 15 to 19, characterized in that the panel or panels (1) are mounted between the sides of a frame (19) defining the contour of the sheet or enclosure.

21.- Enclosure according to claim 20, characterized in that the panels (1) are joined to the sides of the frame (19) and to each other, through the overlapping strips (16) thereof, by welding.

22. - Enclosure according to claim 20, characterized in that the panels (1) are joined to the sides of the frame (19) and to each other, through the overlapping strips (16), by means of screws or rivets.