FR2802952A1 - SLAB FOR MOUNTING ON A CHASSIS CARRYING A FALSE CEILING STRUCTURE - Google Patents

Abstract

The slab (1) is composed of a polygonal textile sheet (2) with several square elements (4-7) fixed to the corners of the sheet. A set of rods (8,9) are stretched between two diametrically opposite corner elements.

Description

i SLAB FOR MOUNTING ON A CARRIER CHASSIS

OF A FALSE CEILING STRUCTURE

  Technical field The invention relates to the interior architecture sector. It relates more particularly to a new structure of false ceiling tiles, intended to equip premises of very different sizes ranging from a few meters to a few hundred square meters. It more specifically relates to the use of a textile sheet for the production of false ceiling tiles.10 Prior techniques As we know, false ceilings are generally made from unitary tiles which are placed on a frame itself. even suspended under the ceiling of the room or building in which the false ceiling is installed.15 Such a frame generally consists of a grid made from inverted T profiles, the frame being connected to the ceiling itself by a

set of lines.

  The grid defined by these profiles is arranged to receive slabs whose periphery rests on the horizontal zones of the aforementioned T profiles.

  The slabs mounted on these frames are generally essentially rigid, and made from materials incorporating a large fraction of plaster. Of

  such slabs are therefore relatively heavy and bulky.

  Furthermore, to arrange special ceilings, generally of large size, it has already been proposed to install a very large textile fabric.

  dimensions, cut to measure to the geometry of the part, and most often30 held in position by a system of elastic tensioners.

  Such an embodiment, if it offers the advantage of being aesthetic, on the other hand has the drawbacks inherent in specific tailor-made embodiments.

  Indeed, the installation of such a false ceiling requires a visit prior to the manufacture of the textile fabric, as well as the unique cutting operations.

  It is therefore impossible to automate and produce large numbers of large canvases, since it is essential to cut

  particular following the intervention of footage of the piece. All of these drawbacks result in a high cost price of false ceilings made of stretched canvas.

  The invention proposes to provide a false ceiling structure which combines the practical advantages of installing false ceilings in rigid tiles, while retaining the flattering aesthetic appearance of false ceilings in stretched canvas.

  The invention therefore relates to a slab intended to be mounted in a chassis carrying a false ceiling structure.

  This slab is characterized in that it consists of: - a textile sheet of polygonal shape, - of a plurality of peripheral elements secured to the textile sheet at the angles of said sheet, of a set of rods bandaged between two peripheral elements

diametrically opposite.

  In other words, the tiles in accordance with the invention are unit surface tiles, the quantity of which is necessary to cover the ceiling can be determined during the installation of this false ceiling, without prior compulsory inspection.

  Such tiles are made of stretched textile and therefore have the aesthetic and functional advantages of using textiles.

  In practice, the tiles are preferably square, or even

  rectangular, but in certain particular embodiments, other polygonal shapes could be adopted without departing from the scope of the invention.

  Advantageously in practice, the textile sheet can comprise several layers of different natures making it possible to combine different properties

specific to each layer.

  Thus, an openwork textile sheet can be associated with an opaque fabric, so as to bring out the openwork nature of the visible sheet on lighting.

  In another application, the textile sheet may include a layer of foam intended to provide thermal or sound insulation. In another family of applications, the textile sheet may include an electrically conductive fabric, so as to serve as a heat source when it is suitably supplied. According to another characteristic of the invention, each peripheral element has a square or triangle shape, and is arranged at an angle of

the textile sheet.

  In this way, the ends of each side of the textile sheet are firmly held to ensure optimum tensioning thanks to the banded rods.

  Advantageously in practice, each peripheral element comprises means for pinching the textile sheet, so that the tiles can be

  assembled on demand, as the false ceiling is covered.

  Storage of the textile sheets independently of the peripheral elements also proves advantageous in terms of space.

  In a first embodiment, the peripheral element comprises: a jaw comprising: a bearing face, two lateral faces connected to the bearing face facing the edges of the textile sheet, 30. two edges each connected to a lateral face, and oriented in the direction of the bearing face, and intended to come into contact with the textile sheet near its edges; - A corner adapted to be embedded in the jaw, and having: a first face intended to come into contact with the textile sheet to press it against the edges of the jaw, a second face forming an angle with said first face; - a counter wedge capable of fitting between the bearing face of the jaw and the second face of said corner, so as to press said corner against the edges of

  the jaw by pinching the textile sheet.

  In other words, each peripheral element comprises two parts capable of sliding relative to one another, and which come to be embedded in a jaw

  so that the corner comes to pinch the edge of the textile sheet against the jaw.

  The counter wedge is held in place by the force exerted by the banded rod, which ensures a permanent pinching of the textile sheet.

  In a particular embodiment, the first face of the corner on which the fabric comes, has ribs located opposite the edges of the jaw. In this way, the edges of the jaw slightly penetrate inside these ribs to further ensure a more effective pinching of the

textile sheet.

  Advantageously in practice, the wedge and the counter wedge include

  means for guiding their relative displacement.

  In this way, when the counter corner is placed inside the jaw, its displacement is necessarily carried out along a diagonal of the

  textile sheet, or the bisector of the angle formed by the two edges of the jaw.

  Advantageously in practice, these guide means can be constituted by a rib and a complementary groove arranged on the corner and the counter

  coin.30 In a particular embodiment, the jaw is made of metal, so that its thickness can be greatly limited, and that consequently the

  fraction of the peripheral element located below the tissue is extremely small.

  Thus, when the tiles are placed in the supporting frame, there is practically no difference in height between the textile sheet and the frame.

well said.

  Obviously, such a peripheral element can be declined in multiple geometries, and is not limited to the single form of rectangular slabs or

  square, but it is possible to adapt such an element for angles other than 90, or even curved shapes.

  In some applications, it may be interesting to combine different

  peripheral elements according to the invention to allow the joining of slabs so as to form a larger area composed of several slabs.

  In another particular embodiment, the clamping means of the peripheral element consist of: - a groove intended to receive an edge of the textile sheet, - a tongue articulated with respect to an edge of the groove, and movable between two positions, namely a retracted position in which it is located outside the groove, and a locking position in which it

  is inside the groove and blocks the fabric.

  In other words, according to this embodiment, the tongue provides sufficient pressing force to prevent the tissue from being pulled out of the rib.

  The pinching means are adaptable to different thicknesses of textile sheet, and in the case where the fabric is relatively thick and perforated, the blocking is further improved by the cooperation of the tongue with the thread of the fabric with which it is in contact. , each peripheral element comprises a housing for receiving one end of the rod, allowing easy and durable mounting of the rod in

across the slab.

  In a particular embodiment, at least one of the peripheral elements comprises means for adjusting the tension exerted by the banded rod. Indeed, in certain applications, it may prove to be advantageous to adjust the tension force exerted by the deformation of the rods. 5 For particular applications, the slab may further comprise a tie cooperating on the one hand, with the rods at their crossing zone, and on the other hand, with the textile sheet, so as to give said sheet a convex shape in the direction of the rods. 10 In this way, each slab takes on an almost conical shape which is particularly sought after in acoustics since the developed surface of such a slab is

  greater than the projected square area. The absorption phenomena are increased because the angles of incidence are attenuated, which is favorable to the attenuation of the sound waves.

  In addition, such a geometry gives an attractive aesthetic appearance.

  The reverse geometry can be adopted in the embodiment in which the slab further comprises an arrow cooperating on the one hand, with the rods at their crossing zone, and on the other hand, with the textile sheet at

  level of its center, so as to give the textile sheet a concave shape in the direction of the stems.

  In this case, the center of the textile sheet is pushed back from its rest position located in the plane defined by the peripheral elements. Such geometry is,

  for the same reasons as stated above, appreciated for its acoustic properties.

  Of course, false ceilings can be equipped with the two types of particular tiles mentioned above, which can be mixed, in particular in staggered rows to

some applications.

7 Brief description of the figures

  The manner of carrying out the invention as well as the advantages which result therefrom will emerge clearly from the description of the embodiments which follow in support of the

  appended figures, in which: FIG. 1 is a top view of a slab according to the invention.

  Figure 2 is a side view of the slab of Figure 1.

  Figure 3 is a vertical sectional view of a tile according to the invention mounted on the chassis of the false ceiling.

  Figure 4 is a summary perspective view of the jaw used for

  form a first type of peripheral element.

  Figure 5 is a summary perspective view of the corner used in the first type of peripheral element.

  FIG. 6 is a summary perspective view of the counter wedge used in cooperation with the jaw of FIG. 4 and the corner of FIG. 5.

  Figure 7 is a view of the peripheral element consisting of the elements of Figures 4 to 6, the section being taken along a bisector plane of the element

  peripheral. Figure 8 is a detailed sectional view of a peripheral element shown awaiting receipt of a textile sheet.

  Figure 9 is a section identical to Figure 8 in which the peripheral element cooperates with the textile sheet.

  Figures 10 and 1 1 are views in median section of alternative embodiments of the slab.

  Manner of realizing the invention As already said, the invention relates to a new slab structure intended

  to be fitted with false ceilings, in which the main face consists of a textile sheet.

  The geometry of such slabs can be extremely varied, is in no case

  limited to the square shape as illustrated in the appended figures.

  More precisely, and as illustrated in FIG. 1, the slab (1) according to the invention consists of three essential parts, namely: * a textile sheet (2) of square shape, * four peripheral elements (4-7 ), each having a square shape, located at each corner of the textile sheet (2), * and two metal rods (8, 9) bandaged between the peripheral elements (4, 6; 5, 7) located on the same diagonal, so as to exert tension on the textile sheet (2), and give it, in the form illustrated in the

Figure 1, a flat geometry.

  More specifically, the textile sheet (2) is equipped in each of its corners with peripheral elements (4-7) having a square shape, and the face of which

  lower (10) is intended to rest on a T-profile (11), as illustrated in FIG. 3.

  The association of such T-sections forms a grid defining square openings inside which the slabs conforming to

the invention.

  The frame made up of such T-sections (11) is suspended below the main ceiling (13) by means of hangers (14) or any other equivalent means. Each peripheral element (4-7), as illustrated in Figures 4 and 5, is intended to pinch the tissue in its peripheral zone, preferably without any organ coming through or piercing the tissue, which would constitute primers tear when the latter is under tension. 25 Such a peripheral element can be constituted by the assembly of the three elements illustrated in FIGS. 4 to 6. For greater clarity, the various members of the peripheral element have been shown in such a way. so that they face upwards and face downwards when the slab is in place to

form the false ceiling.

  Thus, the textile sheet is shown on the top of the peripheral element while when the slab is placed on the supporting frame, the textile sheet

will be laid down.

  More precisely, the peripheral element comprises, as illustrated in FIG. 4, a jaw (20), which essentially has a bearing face (21), of illustrated trapezoidal shape, but which can follow other shapes, provided that 'it provides sufficient support at the corner and counter corner. 5 This bearing face is extended laterally by two lateral faces (22, 23), which are perpendicular thereto. These lateral faces (22, 23) come opposite the

  edges of the textile sheet (2). Each of these lateral faces (22, 23) has a rim (24, 25) oriented in the direction of the bearing face (21), and the end (26,10 27) of which is intended to come into contact with the textile sheet, and preferably between two threads to ensure effective anchoring.

  The jaw (20) is made of a metallic material such as stainless steel.

  The advantage of using a metallic material is to minimize the thickness of the flanges (25, 26) which are the only parts of the peripheral element to be located on the underside of the textile sheet when the latter is put in place. place in the false ceiling. 20 This jaw (20) is intended to accommodate the corner (30) illustrated in Figure (5). This corner (30) has a general shape, seen from above, of an isosceles right triangle, in the most frequent case where the slab is of square or rectangular shape, but this shape could vary depending on that of the slab. corner (30) has a first face (31) which is intended to come into contact with the textile sheet (2) so as to press it against the flanges (24,

) of the jaw (20).

  To this end, the first face (31) of the corner (30) may have grooves (33, 34) parallel to the sides at right angles to the corner. These two grooves (33, 34) are located at a distance from the sides of the corner substantially equal to the distance which separates the edges (26, 27) of the flanges (24, 25) relative to the lateral faces (22, 23) of the jaw (20) .35

2802952

  In this way, the edges (26, 27) are plumb with the ribs (33, 34) when the wedge is placed in the jaw, and the tissue is therefore slightly there.

  imprisoned. It follows that the risks of slipping of the tissue or of leaving the peripheral element are very markedly reduced, or even non-existent, for almost the majority of types of tissue.

  The corner (30) has a second face (32) which has a certain inclination relative to the first face (31), so that the thickness of the corner is greater than its right angle (35) relative to its hypotenuse (36) .10 In this way, the space between this lower face (32) and the bearing face (21) of the jaw when the wedge (30) is embedded therein, also has a

  variable thickness, intended to accommodate the counter corner (40) illustrated in FIG. 6.

  Such a counter corner (40) has a thickness such that when its face (41) slides against the face (32) of the corner (30), the face (42) of the counter corner (40) ends up

  come into contact with the bearing surface (21) of the jaw, and therefore presses the textile sheet (2) against the edges (24, 25) of the jaw.

  The movement of movement of the counter corner with respect to the corner is guided by the middle rib (43), which slides in the groove (36) provided at

  this effect on the face (32) of the corner (30).

  Maintaining the counter corner (40) in position relative to the corner (30) is effected by the force exerted by the rod (8, 9) which comes to bear on the counter corner

  (40), at a housing (46) provided for this purpose.

  In this way, the counter corner (40) remains locked in this recessed position inside the jaw, which therefore maintains the clamping force exerted on the

  textile sheet by the edges (24, 25) of the jaw (20).

  Obviously, the wedge (30) and the counter wedge (40) can be made of a wide variety of materials, in particular plastics such as

  polypropylene, polyvinyl chloride, polyamide which are advantageously light.

  il By the design and the simplicity of this peripheral element, one conceives the possibility of associating several of these peripheral elements, at the level of the lateral faces of the jaws (22, 23) for example to form a junction zone between several textile sheets , and thus achieve a butting. 5 The very small thickness of the lateral faces of the jaw makes it possible to bring the adjacent textile sheets very close together, so as to ensure

almost perfect butting.

  Thus, according to another alternative embodiment, a peripheral element can

  consist of a profile, or as illustrated by way of example, by the association of two profiles.

  Thus, as illustrated in FIG. 8, the peripheral element comprises a

  first U-shaped profile (50), forming an external part, and comprising a groove (51) receiving a second thinner profile (55).

  The underside (52) of the outer U-shaped profile is intended to rest on the T-shaped profile (11) of the chassis.

  The groove (51) of this U-shaped profile (50) receives the second profile (55) intended to

  perform the pinching function of the fabric.

  In a different embodiment not shown, the elements

  peripherals can be realized by a single profiled element.

  As regards the internal profile (55) illustrated in FIG. 8, the latter essentially comprises a groove (56) and an articulated tongue (57).

  The groove (56), parallel to the groove (51) of the outer profile (50), is intended

  to receive an edge of the textile sheet (2).

  The tongue (57) is articulated relative to an edge of the groove (56), and more precisely relative to the wall (58) forming the upper part of the profile

internal (50).

  This articulation is obtained by an area (59) of reduced thickness and allows the tongue (57) to pivot between two positions.

  Thus, as illustrated in FIG. 8, the external zone (50) of the profile (55) of pinching raised, so that the tongue (57) is located in the retracted position, and is located outside the groove (56 ). In contrast, as illustrated in FIG. 9, the external zone of the profile (50) is pivoted so that the tongue (57) is found inside the rib

  (56), and oriented towards the interior of the rib (56).

  Thus, the tongue (57) pinches the fabric on the opposite wall (52) of the internal profile (51), and the orientation of the tongue (57) forms a flying arc opposing the exit of the fabric. The locking of the fabric is further improved in the case where the textile sheet (2) comprises an openwork structure in which the warp or weft threads are relatively spaced from one another, such as in particular for technical fabrics sold under the mark BATYLINE .20 In this case, a particular wire (65) of the fabric, of relatively large diameter comes to cooperate with the end of the tongue (57) and ensures a precise blocking and

closes in position of the fabric.

  As illustrated in FIGS. 8 and 9, the external zone (60) of the internal profile (55) also comprises, beyond the tongue (57), a curved zone (64) intended to come to bear on the fabric when the latter this is in the pinched position,

  so as to ensure regularity of the peripheral tension of the tissue.

  This outer area (60) also serves as support for the user to

  cause the tongue to pivot.

  Obviously, the invention is not limited to the form of peripheral element illustrated, but covers all variants in which the fabric is pinched by any appropriate means in its peripheral zone. Indeed, one of the advantages of the invention is to allow easy installation of the peripheral elements 13 around the sheet of fabric, and this on demand, as and when the setting

  places elements in the supporting frame.

  According to another characteristic of the invention, the slab (1) comprises rods (8, 9) for tensioning the fabric. These rods (8, 9) cooperate with the peripheral elements (4-7) at the level of grooves or housings (46) provided for this purpose. Such housings (46) can advantageously be arranged on the counter corner (40) or at the junction zone of the two arms of the element's bracket.

  device shown in Figure 8.

  This housing (46) has an inclination (a) relative to the main plane of the slab (1), so that the rods (8, 9) which it accommodates are bent to exert a tensile force stretching the fabric .15 The inclination (a) is determined so that the tension on the fabric is sufficient for the fabric to be effectively flat and to have no curvature

due to its own weight.

  In certain embodiments, it can be provided that the housings (46) receiving the ends of the rods (8, 9) are equipped with means making it possible to adjust

  more finely the tension of the rod.

  However, in simplified forms, the rods are designed so

that such adjustment is unnecessary.

  Furthermore, the length of each branch of the peripheral element is

  also determined to avoid sagging of the center and edges of the textile sheet due to its own weight.

  In practice, good results have been obtained using textile sheets (2) of square shape, 600 mm on a side, and a weight of 500 g per square meter.

  The peripheral elements (4-7) have a length of the order of

  80 mm, and the rods (8, 9) used are cylindrical steel rods, with a diameter close to 6 mm.

  The tension exerted on the fabric is sufficient for an inclination (a) of the rods (8, 9) at the level of the peripheral elements (4-7) of the order of 15.

  The invention also covers alternative embodiments as illustrated in FIGS. 10 and 11, in which the textile sheet is no longer flat, but at

  contrary marries a curvature oriented either upwards or downwards.

  Thus, as illustrated in FIG. 10, the slab (80) comprises an additional element constituting a tie rod (81), and connected on the one hand, to the rods (82), at their intersection, and on the other hand, cooperating with the textile sheet (83) at its center, via a protruding zone (84) passing through a hole

  (85) formed for this purpose in the center of the sheet.

  The length of this tie rod (81) is less than the distance which separates the rods (82) from the textile sheet (83) when the latter is at rest. In this way, the center of

  the textile sheet is raised relative to the main plane of the slab (80).

  The tie rod (81) and the central zone of the sheet (83) can advantageously be equipped with all means making it possible to avoid degradation of the

  fabric due to the additional traction exerted.

  Conversely, the slab (90) illustrated in Figure I 1 has an arrow element (91), cooperating on the one hand, with the rods (92) at their intersection, and on the other hand, with the center of the sheet (93), so as to push down

  the central zone of the textile sheet below its rest position.

  In this way, the convexity of the sheet is oriented downwards.

  Appropriate arrangements can be provided at the central zone of the sheet to ensure precise positioning and locking in position of

  the lower end of the arrow (91) on the sheet (93).

  The configuration of the two embodiments illustrated in Figures 10 and 1 1 is particularly advantageous for its acoustic properties, since the

  angles of incidence of the sound waves are modified, which is conducive to the absorption of acoustic energy.

  In addition, the surface of the sheet, and therefore its energy absorption capacity is greater than the embodiment in which the sheet is strictly planar.

  Obviously, and as already said, the different planar and convex or concave shapes can be arranged in an associated manner, to give different aesthetic and functional effects. With regard to the textile sheet itself, this can be

  extremely variable, depending on the desired properties.

  Thus, the textile sheet can consist of an openwork fabric such as in particular that sold under the brand BATYLINE by the Applicant.

  This textile sheet may consist of several different layers, such as in particular a layer of openwork fabric, and a layer of more opaque fabric, making it possible to make the tile visually opaque, while leaving it with the aesthetic appearance of 'an openwork fabric.

  The textile sheet can also incorporate a layer of foam or

  equivalent, used for its thermal and / or sound insulation properties.

  Furthermore, the color and patterns printed on the textile sheets can be advantageously used to form signage at the false ceiling, which can change with the displacement or replacement of the colored tiles. The use of an openwork textile sheet, or more generally breathable, is particularly advantageous for ensuring the ventilation functions and

air conditioning.

  Indeed, the false ceiling consisting of tiles according to the invention, in which the textile sheets allow air to pass, allows air circulation to

  across the entire surface of the false ceiling.

  In other words, the entire surface of the false ceiling serves as a mouth

ventilation.

  The surface area of such an air vent makes it possible to use air circulating at speeds much lower than those of air circulating in ducts

standard ventilation.

  Thus, the flow noise can be completely eliminated and the air ducts circulating in the false ceiling are useless. It follows that the distance between the actual ceiling and the false ceiling can be significantly reduced since it is not

  no more need to circulate specific air ducts.

  A variation in the permeability of the slabs is adopted to ensure a distribution of the pressure drops such as the flow rate crossing the surface of the false

  ceiling is substantially uniform over its entire surface.

  Such an arrangement also makes it possible to ensure the air filtration operation.

  circulating directly through the tiles and more precisely their textile sheet and no longer through specific systems.

  In an advantageous form of the invention, the various slabs can also incorporate a heating fabric allowing the air passing through them to be heated, and thus ensuring a uniform distribution of heat. In this case, the metallic nature of the jaw (20) of the peripheral element ensures a

effective current supply.

  In practice, the tiles according to the invention can be mounted directly on the site. Indeed, the mounting of a slab includes the operations of placing the four peripheral elements at the corner of the textile sheet, then the placing of the two diagonal rods across the textile sheet. It follows that the storage of the various elements intended to make the false ceiling can be ensured independently, the textile sheets being stored

  independently of peripheral elements and rods.

1'7 2802952

  It emerges from the above that the structure of the false ceiling tiles in accordance with the invention has numerous advantages, in particular: + the ease of assembly, + the possibility of producing the false ceiling from standard elements, without requiring prior visit, * the ease of storage of standard elements intended to make the slabs, * a great variety in the forms used, * a great variety in the types of textile used, which allows the false ceiling to be very numerous aesthetic aspects, as well as numerous thermal or sound insulation functions, + the possibility of giving the false ceiling geometric shapes with convexities conducive to the absorption of acoustic waves, * the possibility of making false ceilings serving as a mouth for aeration of surface very largely superior to the conventional unit mouths, with the consequence of the elimination of the inherent defects nts to the air ducting system such as flow noises and congestion, * the possibility of organizing at will and very simply the air blowing zones according to the evolving office arrangements as well as the seasons: blowing of fresh air in summer at the back of offices, blowing hot air in winter near windows, + the possibility of making textile tiles without using materials

  fibrous which can pollute the quality of the ambient air.

Claims (15)

  1 / Slab (1) intended to be mounted in a frame carrying a false ceiling structure, characterized in that it consists of: a textile sheet (2) of polygonal shape, - of a plurality of peripheral elements (4-7) secured to the textile sheet (2) at the corners of said sheet (2), - a set of rods (8, 9) bandaged between two peripheral elements (4-7) diametrically opposite.   2 / tile according to claim 1, characterized in that the textile sheet (2) follows a square or rectangular shape.   3 / tile according to claim 1, characterized in that the textile sheet comprises   several layers of different nature.   4 / textile slab according to claim 3, characterized in that the textile sheet includes a layer of foam.   5 / tile according to claim 3, characterized in that the textile sheet includes an electrically conductive fabric.   6 / slab according to claim 1, characterized in that the peripheral elements   (4-7) comprise means (25) for pinching the textile sheet (2).   7 / slab according to claim 1, characterized in that each peripheral element comprises: - a jaw (20) comprising: a bearing face (21), 30. two lateral faces (22, 23) connected to the face of support (21) coming opposite the edges of the textile sheet (2), two flanges (24, 25) each connected to a lateral face (23, 24), and oriented in the direction of the support face (21), and intended to come into contact with the textile sheet (2) near its edges - a corner (30) capable of fitting into the jaw, and having a first face (31) intended to come into contact with the textile sheet (2) to press it against the edges (24, 25) of the jaw (20), a second face (32) forming an angle with said first face (31); - a counter wedge (40) capable of fitting between the bearing face (21) of the jaw (20) and the second face (32) of said wedge (30), so as to press said wedge (30) against the edges (24, 25) of the jaw (20) by pinching the sheet textile (2).   8 / slab according to claim 7, characterized in that the first face (31) of the corner (30) has ribs (33, 34) located opposite the flanges (24, 25) of jaw.   9 / Slab according to claim 7, characterized in that the corner (30) and the counter   corner (40) comprise means (37, 43) for guiding the relative movement of one relative to the other.   / Slab according to claim 9, characterized in that the means consist of a rib (43) and a complementary groove (37) arranged on the corner (30) and the counter corner (40).   11 / Slab according to claim 7, characterized in that the jaw (20) is made of metal.   12 / Slab according to claim 6, characterized in that the clamping means consist of: - a groove (56) intended to receive an edge of the textile sheet (2), - a tongue (57) articulated relative to a edge of the groove (56), and movable between two positions, namely a retracted position in which it is located outside the groove (56), and a locking position in which it   is located inside the groove (56) and blocks the textile sheet (2).   13 / slab according to claim 1, characterized in that each peripheral element (4-7) comprises a housing (46) for receiving one end of a rod (8, 9).   14 / slab according to claim 1, characterized in that at least one peripheral element (4, 7) comprises means for adjusting the tension exerted by the bandaged rod (8, 9).   15 / slab (80) according to claim 1, characterized in that it further comprises a tie rod (81) cooperating with the rods (82) at their crossing zone, and   with the textile sheet (83) at its center, so as to give said sheet (83) a convex shape in the direction of the rods (81).   16 / slab (90) according to claim 1, characterized in that it further comprises an arrow (91) cooperating with the rods (92) at their crossing zone,   and with the textile sheet (93) at its center, so as to give the textile sheet (93) a concave shape in the direction of the rods (91).