DESC RI PTION

The present invention refers to a flexible panel, i.e. a panel used for the construction of prefabricated walls, dwellings and/or as thermal or acoustic insulation , and relative production method thereof.

In the event of a natural calamity it is often necessary to provide emergency dwellings.

Normally tents are used but they are not particularly robust and are normally inadequate when meteorological conditions are extreme.

Means exist to create more robust and more performing walls, such as metal structures covered by tarpaulins, prefabricated concrete structures and many others. These solutions, however, require many materials that have to be transported and long preparation and installation times.

The object of the present invention is to provide a flexible panel wh ich is easy to produce.

A further object is to provide a flexible lightweight panel.

A further object is for it to be easily transportable. A further object is for it to have minimum overall dimensions for transport.

It must also be easy to install. It must also be possible to use materials available in situ .

According to the present invention , said objects and others are achieved by a flexible panel comprising: a plurality of first blades, made of semi-rigid material , of rectangular shape, having a pair of long sides and a pair of short sides; a pair of textile membranes which connect each pair of said first blades along said long sides; each of said plurality of first blades comprises at least one second blade, of quadrilateral shape, connected in a fold ing manner to one of said short sides, along a line of contact between one of said plu rality of first blades and said at least one second blade; when said panel opens, it creates vertical tubular hollow areas delimited laterally by said plurality of first blades and by said one pair of textile membranes that joins them. Said objects are furthermore achieved by a method for the production of a flexible panel comprising the phases of joining a flexible membrane to each of the long lateral edges of a plurality of first rectangular semi-rigid blades; join ing along a short side of each of said plurality of first rectangu lar semi-rigid blades at least one second blade, in a folding manner along a line of contact between said plurality of first blades and said at least one second blade, so as to create vertical tubu lar hollow areas delimited laterally by said plurality of first blades and by said one pair of textile membranes that joins them .

Further characteristics of the invention are described in the dependent claims.

This solution offers many advantages with respect to the solutions of the known art.

Thanks to the present invention a panel is obtained which can be compressed like a concertina during transport, i.e. when at rest, having negligible dimensions with respect to the dimensions when installed .

Also the weight is greatly reduced when at rest,

The manufacture is simple and can be carried out by a combination of existing technologies.

Once positioned in situ , even without fillings, it is self- supporting and therefore facilitates installation.

Thanks to its structure, it is possible to obtain not only straight panels but also curved panels and panels with 90° angles, without the use of additional structural elements.

Once the compartments, which form inside the panel when opened , are filled with various types of materials, easily found in situ , it becomes a stable wall to all intents and purposes.

The invention is designed for widespread use in the humanitarian sector, more precisely in the field of post- emergency housing reorganization . It can also be applied as a permanent or temporary partition system in different fields of use: civil or m ilitary, outdoor or indoor, construction or furnishing.

The structure can be applied not only as a vertical wall but also as a horizontal or sub-horizontal surface for use as a ground insulating layer or as a cover.

The materials constituting the product (textile membranes and semi-rigid bars) , the height of the panel and the dimension of the cells can vary according to the intended application .

The characteristics and advantages of the present invention will become evident from the following detailed description of a practical embodiment thereof, illustrated by way of non-limiting example in the accompanying drawings, in which :

figure 1 shows a flexible panel , seen closed, accord ing to the present invention ;

figure 2 shows a flexible panel, installed , with upper blades open according to the present invention;

figure 3 shows a flexible panel, installed , with blades partially closed , according to the present invention ;

figure 4 shows a flexible panel , with upper blades closed and lower blades open , according to the present invention ;

figure 5a shows a main blade of a flexible panel , from the front and in section, according to an embodiment of the present invention;

figure 5b shows a main blade of a flexible panel, from the front and in section, according to another embodiment of the present invention , with the insertion of ribs;

figure 6a shows a flexible panel , installed, which forms curves, according to the present invention;

figure 6b shows an enlarged portion of a flexible panel, installed, which forms curves, according to figure 6a of the present invention ;

figure 7 shows a flexible panel , during the formation of a 90° angle, according to the present invention;

figure 8 shows a flexible panel, with a 90° angle, according to the present invention ;

figure 9 shows a flexible panel, installed , as an inclined roof, according to the present invention ;

figure 1 0 shows a flexible panel, installed , with blades partially closed and flexible membranes of multiple length with respect to the length of the first blade 1 1 , according to the present invention .

Referring to the attached figures, a flexible panel , according to the present invention, comprises a plurality of first blades 1 1 , made of semi-rigid or rigid material, with rectangular shape, having a pair of long sides 1 2 and a pair of short sides 1 3. Each first blade 1 1 comprises a pair of second blades 14, with quadrilateral shape, connected in a folding manner to the short sides 1 3 of the first blades 1 1 .

The second blades 1 4 are foldable in the sense that they can rotate with respect to the short sides 1 3 along the line of contact between the second blades 1 4 and the first blades 1 1 .

Said panel furthermore comprises a flexible membrane 1 5 which connects each pair of first blades 1 1 along the long sides 1 2.

The first blades 1 1 and the second blades 14 are made, for example, of polyvinyl chloride (PVC) with thickness of 1 -3 mm, and are cut, starting from square or rectangular sheets, using a numeric control plotter. With these thicknesses, semi-rigid structures are obtained which can be flexed but not bent.

To obtain completely rigid structures, thicker blades can be used , or alternatively rigid materials, for example metals or composites, or having a greater resistance to the peak loads applied to the short sides 1 3.

It is advantageous, however, to use materials with minimum thickness blades in order to reduce weight and overall dimensions.

The first blades 1 1 and the second blades 1 4 are flat, but to increase the rigidity, in an alternative embodiment, ribs 16 are provided , for example two longitudinal ribs having rectangular or trapezoidal section , obtained by means of thermoforming or pressing according to the material used.

Along the contact (and bending) line 20, between a short side 1 3 of the first blade 1 1 and the inner side of the second blade 1 4, a slit 21 is made, central to the short side 1 3, to close the second blade 1 4 and to facilitate bend ing of the second blade 14 along the bending line 20.

To facilitate bending, a plurality of slits or holes can also be provided as an alternative or in combination spaced from one another along the bending line 20.

Lightening of the bending line, by means of holes or slits, facilitates bending or, in other words, rotation of the second blade 1 4 around the joining line between the second blade 1 4 and the first blade 1 1 .

The second blade 1 4 comprises, on the side opposite the line of contact 20 with the first blade 1 1 , and centrally to it, a rectangular flap 22 wh ich extends beyond the edge of the side of the second blade 14.

The second blade 14 further comprises a pair of incisions 23 distinct and angled 90° from each other. They are arranged substantially on the lines joining the vertex of the angles of the second blade 14, at the back of the short side 1 3, and the centre of the second blade 14. The flap 22, of a second blade 1 4, is adapted to cooperate with the slit 21 of a second blade 14 adjacent to the previous one. By inserting the flap 22 into the slit 21 , the second blade 1 4 can be closed in a horizontal position , in the case of straight panels.

The flap 22, of a second blade 1 4, is also adapted to cooperate with the pair of incisions 23, of a second blade 1 4 adjacent to the previous one, being inserted between them to block the second blade 1 4 on the adjacent one, in the case of curved panels.

Alternatively to the pair of incisions 23 it is possible to provide only one incision which describes an arc, to allow insertion of the flap 22 in the case of curvature of the panel .

According to the present invention the second blades 1 4 are also semi-rigid like the first blades 1 1 , but in an alternative embodiment, the second blades 1 4 can be made of any material, also flexible (like the flexible membrane 1 5) glued to the first blades 1 1 along the line of contact 20.

The blades 1 4 can also be rectangular 40 and be longer than the short side 1 3. Furthermore, the flexible membrane 1 5, positioned between a first blade 1 1 and the adjacent one, can have several pre-folds 24, parallel to the long side 1 2 of the first blades 1 1 , intermediate with respect to the two weldings on the edges of the long sides 1 2 of the first blades 1 1 . The pre-folds 24 are provided to facilitate bending of the flexible membrane 1 5 towards the inside of the panel.

In an alternative embodiment (figure 1 0) between two first adjacent blades 1 1 there can be two lateral pre-folds 24 and a central pre-fold 41 . The lateral pre-folds 24 ensu re that the flexible membrane 1 5 bends easily towards the inside of the panel , and the central pre-fold 41 is provided to facilitate bending thereof towards the outside of the panel ; thanks to the pre-folds 24, the flexible membrane 1 5, once folded , remains inside the panel between two first adjacent blades 1 1 .

The flexible membrane 1 5 is made of a material like polyester coated with polyvinyl chloride (PES/PVC) , for example, with a thickness of 0.1 - 1 mm , so as to obtain an impermeable membrane, sufficiently robust and flexible (soft, bendable, deformable) .

The flexible membrane 1 5, which has a width equal to the length of the first blade 1 1 , or a multiple of it, is welded , by means of ultrasound or high frequency or by heating , to the edges of the long sides 1 2 of the first blades 1 1 , ensuring that the first blades 1 1 are spaced from one another by a pre-defined distance.

The pre-fold 24 is obtained via the use of automated fabric pleating machines and can be reinforced by a light welding, which facilitates bending in the required direction . Said pre-fold 24 facilitates concertina folding of the panel , facilitates tensioning and allows curvatu re of the panel in an aesthetically pleasing manner; it also aids the flexible membrane 15 which can be used for curvature of the panel , avoiding puckering.

The dimensions of a panel in one of the possible embodiments according to the present invention are the following.

The first blade 1 1 and the second 14 blade are 250 mm wide, the first blade 1 1 is 2000 mm long , the slit 21 is 80 mm long, the flap 22 is 80 mm wide and 30 mm long, the incisions 23 are 30 mm long and 3 mm wide, and the length of the flexible membrane 1 5 between two first adjacent blades 1 1 is 250 mm.

The panel can have any length since it is possible to join any number of blades 1 1 with the flexible membrane 1 5.

In an alternative embodiment of the panel, instead of having two pairs of second blades 14, the panel comprises only one second blade 1 4, which can be closed , on one side, while the other side is closed by other closing means, for example a portion of flexible membrane like that of the sides 1 5, or can be left completely open .

The operation of the invention is obvious for a person skilled in the art from what has been described and in particular is the following.

The desired length of the panel is obtained by making it to size or cutting it from a longer panel. The incision can be made along the flexible membrane 15.

The panel, since it is a concertina panel thanks to the flexible membrane 15, is opened by extending the concertina.

The second blades 14 are closed on one side. Said side will become the lower one to be placed on the ground or on a surface provided. For said closing, the second blades 14 are folded along the folding line 20 and the flap 22, of a second blade 14, is inserted into the incisions 20 or 23 of the second adjacent blade 14, according to the linear or curvilinear configuration of the structure, to lock it in the closed position.

When the panel opens, it creates a plurality of vertical tubular hollow areas 30 laterally delimited by a pair of first adjacent blades 11 and by the flexible membrane 15 that joins them, and which can be closed above and below by means of the second blades 14.

Said areas 30 are now filled with any material 31 preferably found in situ, like earth, sand, stones, wood, sawdust and other. Said material gives the structure a weight and increases its carrying capacity already partially guaranteed by the first blades 11, which are sufficiently rigid .

The areas 30 are preferably filled to 2/3 of their height to give the structure greater stability, because if filled completely, they would make the wall unstable and it cou ld collapse.

The flexible membrane 1 5 forms the sides of the panel and the blades 1 1 (and 1 4) form supports for the panel until the tubular areas 30 are filled with the material 31 . The areas 30 can then be filled , partially or completely, with stabilising materials or even insulating material.

The second upper blades 1 4 are folded by closing all the tubular hollow areas 30, and locked in position by inserting the flaps 22 into the incisions 20 or 23.

Preferably all the second blades 1 4 are folded in the same direction.

The panel can be straight, curved 35 or even at right angles 36. Thanks to the presence of the flexible membrane 1 5 it is possible to curve the profile of the panel by playing on the flexibility of the flexible membrane 1 5 and on the pre-fold 24.

A curved profile 35 of the panel is allowed by the flexibility of the flexible membrane 1 5, which is tensioned on one side and bends on the other side; closing of the second blades 1 4 is possible due to the presence of the incision 21 in which the flap 22 can be inserted also in the presence of curves. Alternatively, by inserting the flap 22 into one of the incisions 23, a curvature of the panel is obtained with amplitude equal to the angle described by each of the incisions 23 with respect to the line of contact 20.

By inserting the flap 22 into one of the incisions 23, a curvature of the panel is obtained with amplitude equal to the angle described by each of the incisions 23 with respect to the line of contact 20.

By alternating the side of insertion of the flaps 22 into the incisions 23 in two adjacent blades 14, and repeating the procedu re several times, a jagged profile of the panel is obtained.

To configure a profile 36 of the panel with a right angle , the incisions 23 must be perpendicular to each other. I n an area 30, on one side the flexible membrane 1 5 is bent 37, while on the other side it is tensioned, obtaining a first angle of 45°. By repeating this operation for two adjacent areas 30, a right-angle panel 36 is obtained .

It is also possible to obtain tapered panels 38 for use as a roof for dwellings made of walls of curved panels with circular profile 35.

In another embodiment of the panel, the second lower blades 1 4, which will rest on the floor, can be widened laterally so that they protrude from the panel, on one side or on both sides, by a few centimetres (for example 2 to 1 5 cm) , so that they can be easily fixed to the floor by means of screws, pegs or accumulation of inert material, like earth , sand or other.

Any materials and any dimensions can be used for the panel, according to requirements and the state of the art.

The panel conceived as above is subject to numerous modifications and variations, all falling within the scope of the inventive concept; furthermore, all the details can be replaced by technically equivalent elements.