EP0890940B1 - Carrying device for tensioned canvas, in particular for display panels - Google Patents

Abstract

The frame (1) is made in two sections (2d,2g) which can pivot about a central vertical axis so they can occupy two different positions, one at an angle to one another for fitting the fabric layer and a second in a straight line for stretching it. The fabric is in the form of a cover with end pouches (91,92) to engage with the frame sections when they are set at an angle to one another, each frame section having a curved member (27) at its end to give the fabric cover a predetermined shape when stretched. The frame sections also have locking members to retain them in the deployed position and can incorporate light or sound systems.

Description

The present invention relates to a support device of canvas under tension, and more particularly a folding device.

The invention also relates to the application of a such a device for producing a display panel, including a wall panel.

In the context of the invention, the term "panel display "should be understood in its most large. It includes in particular store signs, billboards, light boxes, etc. For fix ideas, and without being limiting in any way this is the scope of the invention, we will place ourselves below in the context of this application of the invention (panels and advertising signs), unless otherwise indicated.

Likewise the term "canvas" encompasses many natures of materials: tarpaulin, canvas, lacquered or not, etc.

Many canvas support devices tense are known. They basically include two main subsets: a rigid frame, generally in hollow tubes, possibly supplemented with reinforcements, and the cover fabric, under different shapes: sock, cover, etc. These two subsets are generally supplemented by fasteners the canvas, permanent or removable (stretchers, "bungee cords", etc.). These devices have the advantage of being more lightweight than comparable structures made of material classic: sheet metal, etc., and are generally priced at comes back lower.

However, there are a number of difficulties inherent in the use of structures flexible covering constituted by fabrics.

A first problem encountered in the known art is to obtain a homogeneous tension of the fabric, in particular in its visible parts, so that the surface is free from unsightly wrinkles (especially in advertising or signage applications). This requirement is more difficult to obtain for some panel sections (curved shapes).

We can certainly use tensioners or organs similar, as just mentioned, or sheets underlying, but all of these measures lead to a increase in price, make the structure more complex and, possibly increase their weight negligible.

A second problem is related to the difficulty of setting in place (installation and removal) of the canvas on the rigid frame of the device and the time required for this operation. The above difficulty and the time required depend naturally of the dimensions of the panel but also, at equal dimensions, of the canvas configuration (sock, cover, etc.), as well as whether or not to have tensioners. This last operation, in increasing set-up time, increases correlatively labor costs.

We can finally point out that the structure adopted for the canvas is not without impact on its cost price. AT example, if it is necessary to provide tensioners elastic, of the "bungee cord" type, it is also necessary to realize in the canvas, at the manufacturing stage, holes reinforced with metal eyelets.

It is therefore necessary to best resolve the problems which have just been recalled. But it is useful to note that a number of needs arise, especially among users of this type of device and among which :

It is first of all desirable that, for many applications, the covering fabric be removable, and possibly interchangeable. It must be able to be cleaned. Lacquered canvas, for example, can be cleaned in situ. This is generally not the case for an unpainted canvas. In case of damage or if you want to change the indications (message, image, etc.) carried by the panel, that is to say the visible part of the canvas, it is generally necessary to replace the covering canvas in its entirety.

It is also desirable, even if the panel is placed in a fixed or permanent location, that the assembly (and possible disassembly) operations can be carried out in a limited time, by personnel without specific qualifications and with reduced tools, even without tools at all, which greatly reduces costs related to these operations. It follows that the structure must be simple to handle and present all security, for users or the public, while allowing a good tension of the cover fabric which avoids any unsightly folds.

Finally, the panel section must be able to take different shapes, so as to make panels of flat, domed, etc.

We must also be able to place inside or outside the rigid framework of the source device lights, or even sound sources (speakers, etc.).

The invention sets itself the goal of simultaneously meeting these needs, some of which seem, a priori, contradictory, while overcoming the difficulties encountered in the known art.

To do this, according to a first characteristic of the invention, the fabric support device stretched according to the invention comprises a rigid frame, comprising two folding frames, with central articulation. This frame is fitted with locking members in end zones, reversibly locking the two frames in unfolded position. The ends of these frames are provided appropriately shaped arches which will be used to define the section of the panel, i.e. its shape (flat or curved).

Advantageously, the covering fabric of the structure is of the cover type, i.e. has folds in the form of pockets at both ends, pockets which simply slip on the ends of the two half-frames, in the folded position. Then simply unfold the two frames and lock them in this position. We then automatically and simply obtains the desired tension of the covering fabric and its setting form.

In a preferred embodiment of the invention, at least one of the frame ends, i.e. at minus one of the ends of the supporting structure, is fitted with an adjustable telescopic extension member. This arrangement provides an adjustable tension of the canvas and / or accommodate disparities or variations in dimension of it.

In addition, according to the invention, the support device is associated with members lifting to place it at the desired height on a vertical plane, for example the wall of a shop or similar building.

The subject of the invention is therefore a support device of stretched canvas for the production of display panels, comprising a rigid frame, said canvas covering at least one so-called main face of this framework, characterized as defined in independent claim 1.

The device according to the invention therefore have many advantages, including a light structure and great simplicity of implementation. It allows operations of placing or removing the canvas very fast, while obtaining an appropriate fabric tension and a high quality surface finish, without significant increase in the manufacturing price.

• la figure 1a illustre, en perspective, un exemple de dispositif support de toile tendue selon un mode de réalisation préféré de l'invention ;
• la figure 1b est une figure de détail illustrant la pose de la toile de recouvrement sur l'une des extrémités de l'ossature rigide du dispositif de la figure 1a ;
• les figures 2a à 2f illustrent différentes phases de pose et de dépose de la toile sur l'ossature rigide du dispositif de la figure 1a ;
• les figures 3a à 3c illustrent différentes formes possibles de panneaux ;
• et la figure 4 illustre schématiquement l'application d'un dispositif selon l'invention à la réalisation d'une enseigne de magasin.

The invention will be better understood and other characteristics and advantages will appear on reading the description which follows with reference to the appended figures, among which:

• FIG. 1a illustrates, in perspective, an example of a device for supporting stretched fabric according to a preferred embodiment of the invention;
• Figure 1b is a detail figure illustrating the installation of the cover fabric on one end of the rigid frame of the device of Figure 1a;
• Figures 2a to 2f illustrate different phases of installation and removal of the fabric on the rigid frame of the device of Figure 1a;
• Figures 3a to 3c illustrate different possible forms of panels;
• and FIG. 4 schematically illustrates the application of a device according to the invention to the production of a store sign.

We will now describe an exemplary embodiment of a device 1, canvas support stretched according to a method of preferred embodiment of the invention, with reference to Figures 1a to 2f.

The figure illustrates, in perspective, the framework rigid of the stretched canvas support, this canvas 9 (see par example Figure 1b) not being placed on the support.

To fix the ideas, we suppose that the panel which will be obtained after placement of the canvas 9 is a panel elongated, arranged in a substantially horizontal direction, without limiting in any way the scope of the invention. We will therefore speak in what follows, so purely arbitrary, left side and right side, differentiated below by the letters "g" and "d".

According to a first important characteristic of the invention, the support comprises two frames, a frame right 2d and a left frame, 2g, articulated around a vertical post 20, more precisely, around axes of rotation 200 and 201, arranged at the end thereof. These two frames 2g and 2d, can therefore be folded forward, at least partially, by rotation. It follows that the total length of the projection on a vertical plane is between a maximum value, obtained for frames 2g and 2d, unfolded (i.e. included in the same plane) and a minimum length, obtained for folded frames partially (the plans of frames 2g and 2d, forming a angle other than 180 degrees). This first mechanism, to him only, allows to stretch a fabric 9 which will be threaded on the two ends, as described opposite the Figure 1b.

According to another characteristic of the invention, one provides locking members 6g and 6d, arranged on the side and on the other side of the central articulation 20, and allowing to lock, reversibly, the frames 2g and 2d, in unfolded position (maximum length).

According to another characteristic of the invention, and in a preferred embodiment, at least one additional member 4, for adjusting the tension. he comes in the form of an extension organ adjustable telescopic disposed at one end, in the occurrence of the right end in the example described.

Finally, according to another essential characteristic, the device support 1 is associated with suspension and adjustable lifting, shown under references 7 and 8, and which will be detailed below.

We will now describe more precisely the different components of the support device 1, always by reference to Figure 1a.

The frames 2g and 2d, each include two tubes horizontal, an upper tube, respectively 21 and 23, and a lower tube, respectively 22 and 24, the ends located in the central zone of the device 1 are mechanically linked to the axes of rotation 200 and 201.

The left end of the device 1, which does not include no telescopic extension member 4 in the example described, ends with a vertical tubular upright 25 and a hoop 27 of suitable shape, arranged in a plane perpendicular to the plane of the frame 2g. It is this hoop 27 which will impose a predetermined shape on the visible face of the panel, that is to say by convention the front face. In the example described in Figure 1a, it has the shape of a portion of ellipse.

The right end of device 1 is more complex because it includes the extension organ telescopic 4. The right frame 2d is actually consisting of a fixed frame which is extended by a frame telescopic smaller. The fixed frame comprises two horizontal tubes 23 and 24, joined together, in their opposite end to the central upright 20, by an upright vertical tubular 26.

The frame forming the telescopic extension member 4 has the same height as the main frames 2g and 2d. The horizontal tubes 41 and 42 of the frame forming the member of telescopic extension 4 thread, by one of their ends 410 and 420, of reduced diameter, in the tubes 23 and 24, respectively, which are assumed to be hollow. The frame is completed by two vertical tubular uprights 45 and 44. The tube 44, arranged at the left end of the device 1, plays a role similar to the left end tube 25. It is also provided an end arch 43, of the same shape as the arch 27 and playing a role identical to the latter.

An adjustment system, for example two screws or rods threaded 40a and 40b, threaded in threaded holes (not shown) provided in amounts 26 and 45, allows bring them together or move them away at will. It follows that, by guided sliding of the tubes 410 and 420, in the ends of tubes 23 and 24, the extension member telescopic 4 deviates or approaches the center of the device 1, i.e. upright 20, axis of rotation 2g and 2d frames. It should be noted that the extension member telescopic 4 always remains in the extension of the frame 2d, whatever its position in space (unfolded state or folded back from frame 2d).

A simple tool (screwdriver, wrench or the like) activates the screw adjustment system 40a and 40b. This setting adjusts the cumulative length of the two unfolded frames (the right frame being made up of the 2d frame proper and of the organ frame telescopic extension 4), i.e. the length Max.

The total length l _t of the device 1 is therefore given by the formula: l _t = l ₁ + l ₂ + l + Δ l ; with l ₁ length of the left frame 2g, l ₂ length of the right frame 2d, l length of the fixed part of the frame of the telescopic extension member (tubes 41 and 42) and Δ l the amplitude of the possible adjustment using screws 40a and 40b, between 0 and a predetermined maximum value Δ l _max . It should be noted that the relative lengths of the left and right frames, 2g and 2d, are unimportant, even if in an example of practical realization one chooses preferably: l ₁ ≅ l ₂ + l.

In another alternative embodiment, not shown, the screw adjustment system can be replaced by a spring adjustment system. These springs are arranged between the main frame 2d (in the example described) and the telescopic member 4. The springs are normally at the compressed state when the 2d and 2g frames are unfolded and canvas 9 stretched. It follows that, if the tension state of it changes, for example due to variations in outside temperature (constraints thermal), slow or brutal, the voltage adjustment of the fabric 9 is carried out automatically. It follows also that it is no longer necessary to have a special tools.

In yet another variant (not shown), the end adjustment system can be replaced with a rack and pinion type device, provided with a system irreversible unlockable.

As noted, there are also plans to blocking organs and more specifically two organs of blocking 6g and 6d, arranged near the ends of the 2g frames and 2d. These organs each include a tree vertical 60, capable of rotation in two bearings 601 and 602. This shaft 60 causes, in its rotation, a hook blocking device 600. The two blocking members 6g and 6d are mechanically connected by a horizontal link bar 5. More specifically, this link bar 5 connects (in the example described) the lower bearings 601. As it will be described below, this bar 5 also connects guide members 604, the usefulness of which will be specified.

The locking hooks 600 cooperate with locking rods 61, integral with the right frames and left 2g and 2d. More specifically, the rods are are in the form of vertical uprights connecting the upper horizontal tubes 21 and 23, to the horizontal tubes lower 22 and 24. They also include, in a central area, centralizing organs 610 intended to receive hooks 600.

The rotation of the shafts 60 in their bearings 601 and 602, is under the control of handles 603, arranged at their upper end (in the example described on the Figure 1a). Advantageously, the frames 2g and 2d are locked in the unfolded state when the handles 603 are parallel to the frames, for example both facing the right, as shown in Figure 1a. when performs sufficient rotation of the handles 603, by example a quarter or a half-turn, the hooks are disengage centralizing organs 610 and release the locking rods 61. These centralizing members 610 allow mitigate the efforts imposed on axes 200 and 201. Both 2g and 2d frames (or only one of these frames, if only one handle 603 is activated) are then free and you can fold them back by rotation around axes 200 and 201.

To avoid excessive folding, which proves useless as will be shown, we plan preferably 3g and 3d compasses, one for each 2g frame and 2d, connecting by their arms 30 and 31, the connecting bar 5 and the lower horizontal tubes, 22 and 24, respectively. The amplitude of the folding of the frames, 2g and 2d, is then limited to a predetermined value. This provision reinforces the security provided by the device according to the invnetion. It avoids complete folding two frames, 2d and 2g, which would risk injure people in the vicinity or cause damage to nearby vehicles.

The main application of the support device 1 according to the invention is the production of advertising panels or signs attached to walls. To do this, we associates with the support 1 hooking and lifting members. By way of nonlimiting example, as shown in the figure 1a, slideways 7 and suspension cables are provided 8.

The blocking shafts 60, and more precisely their bearings 601 and 602, because the latter are fixed in the space, are fitted with hooking pieces 604 and 605, also mechanically linked to link bar 5 and inserted into grooves 70 made in the slides 7. The same applies to the central upright 20 which includes a hooking piece 203, linked to the bar link 5, and inserted into the groove 70 of a slide 7.

The suspension cables 8 allow the removal of the support device 1 complete and its ascent to a position suitable on the wall, using conventional devices (not shown), winches or other similar gear. For to do this, the cables drive the attachment pieces 203, 604 and 605 and slide them into the grooves 70. If the structure is vertical, the weight of it, driving down, is normally sufficient for the operation of deposit.

In a preferred variant of the invention, the canvas cover is of the "cover" type as shown more particularly the detail figure 1b.

Indeed, still in the preferred application, the support device 1 being attached to a wall, only one of the sides of the panel is visible. It is therefore sufficient to provide, at each end of the device 1 (in FIG. 1b, only the left end has been shown), a threading pocket on the ends of frames 2g and 2d, more precisely on arches 27 and 43 (Figure 1a).

As shown in Figure 1b, the fabric 9 includes a main face before 90 and a main face rear 93. The aforementioned pocket is produced by folds of canvas backwards.

It should be understood that, as has been indicated, it is the shape of the end arches 27 and 43 which imposes the shape of the front face of the panel when it is covered with canvas. Also, the length of the fabric 9 is equal to or slightly greater than l _t (the telescopic extension member allowing an elongation of the structure at most equal to Δ l _max ). Its width must be at least equal to the length of the periphery of the arches 27 and 43. In other words, the fabric 9 will be wider than the frames 2g and 2d.

In the example described in FIGS. 1a and 1b, the device 1, covered with its fabric 9, has a face convex convex.

The end pockets therefore have one side side plane 91 and a folded back face 92, also plane. The junction with the rear main surface 93 can be done by any known process: bonding, welding, sewing, etc., taking into account the nature of the material of the fabric 9. The zones of junction by dotted lines referenced 920.

The internal cavity of the end pockets therefore has a section and dimensions that allow them to be threaded on the ends of frames 2g and 2d.

We will now describe the different operations removal and installation of the fabric 9, with reference to Figures 2a to 2f.

In these figures it has been assumed that the hoops had a shape identical to that previously described, in the occurrence of an ellipse portion. In addition, for simplify the drawings, we only referenced the elements necessary for a good understanding of the invention. Finally, the telescopic extension member 4 has not been shown (Figure 1a). We must also understand that this organ is not mandatory, although it is part integral of a support device 1 according to the mode of preferred embodiment of the invention. The elements common to previous figures have the same references and do not will be re-described as necessary. We only have added to some references the letters "g" or "d" for differentiate the pieces on the left, pieces of the right side.

In Figure 2a, the device is shown support 1 draped with its stretched covering fabric 9. The visible main face 90 is curved. This constitutes the state which can be called normal or permanent.

If we wish to deposit the canvas 9, we act on the top handles, one after the other, for example in first place the left handle, 603g. We make him make at least a quarter turn according to the needles a watch (arrow), which unlocks the frame left (Figure 1a 2g) as shown more particularly Figure 2b. So we can rotate this frame left around the central joint (figure 1a: axes 200 and 201).

On this same figure 2b, we unlock the frame right (Figure 1a: 2d) by acting on the handle 603d, as before and we rotate this frame. The length cumulated of the two frames, projected on a vertical plane is therefore reduced to a minimum value. We can therefore remove the canvas 9 (which is no longer stretched as a result) of the 2g frames and 2d, on which it was placed. To do this, just to pull it by its ends 91. The pockets then slide hoops (see Figure 1b: 27).

FIG. 2c illustrates the state obtained after removal of canvas 9 (bare structure). We see that the compasses allow folding with maximum amplitude: angle α with the connecting bar 5. The depth of the end pockets as well as the value of the angle α must be determined from so as to make it possible to remove the canvas 9 from its support frames.

From this state, you can replace the same canvas 9 or a different canvas. To do this, as illustrated more particularly by FIG. 2d, we thread one of the end pockets over the end of a frame, for example the left frame 2g, then the other end, on the right frame 2d. This operation has already been described with reference to Figure 1b.

In FIG. 2e, all of the fabric 9 is placed and ready to be tensioned. To do this, we fold the frames, one after the other towards the organs of blocking 60 (FIG. 2c), for example the right frame 2d, and we operate the joystick 603d counterclockwise, until the locking hook is obtained blocking 600d (figure 2d).

Then, as shown in Figure 2f, we fold the other frame, i.e. the left frame 2g (Figure 2d) and it is locked using the blocking 60g and hook 600g, by operating the joystick 603d, as before.

These simple operations provide automatically, both a longitudinal tension correct canvas 9 and a smooth appearance of the surface main 90.

Note that the whole process, that is to say the phases shown in FIGS. 2a to 2f, typically occur in a time interval less than 2 minutes.

Although the telescopic extension member 4 has not been shown (FIG. 1a), as indicated above, it is still possible to adjust the total length of the support device 1, by acting on the adjustment members thereof, when it exists. This operation can be carried out either a priori when the fabric 9 is removed (phase shown in FIG. 2c), or a posteriori when the fabric 9 is put in place, the frames 2g and 2d, being unfolded and locked in this position. (phase shown in Figure 2f). The fabric 9 is then pretended, and the final tension can be obtained by acting, behind the panel, on the adjustment members (FIG. 1a: 40a and 40b), using a simple tool, a wrench for example . We can then obtain a fine adjustment allowing, in particular, to "erase" residual folds or to take into account disparities in dimensions, from one canvas to another in the event of replacement, or even a relaxation over time. .

It is easy to see that the operations of removing and installing the fabric 9, as well as putting it under tension are particularly simple, do not require expensive tools, or a priori specific, and are within the reach of non-specialized personnel.

In addition, the adjustment is automatic if the telescopic member 4 is of the spring type. It is not therefore no longer necessary to have any tools, as previously stated.

The surface of the canvas, in addition to its background color, can bear various inscriptions, logos or designs, in particular when it is a billboard or a shop sign. To do this, many known methods can be used. Mention may in particular be made of the application of adhesives, the paint, roller or brush processes, the application of adhesives with digital printing and direct digital printing. The choice of a particular process naturally depends on the specific application and the nature of the support material, that is to say the material of the canvas. Prints can be produced at the time of manufacture, or even in situ , at least for certain processes.

In an alternative embodiment not shown, On can incorporate one or more into the rigid framework light source (s), in particular by implementing diffusing fabrics. Therefore, we can make a box luminous. You can also incorporate sound sources (speakers or other electroacoustic transducers).

As noted, the convex shape that comes to be described is not the only feasible.

Figures 3a to 3c schematically illustrate panels of various sections.

In Figure 3a, there is partially shown a panel la whose main surface 90a of the fabric 9a is of parabolic shape, i.e. having a surface concave. It is necessary that the end hoops (not visible in Figure 3a) have an appropriate profile to impose this new form. Likewise, the pockets end have an internal section allowing insertion frame ends, and in particular the aforementioned arches. On the other hand, for aesthetic reasons, it is advantageous to provide upper 94a and lower 95a walls, rectangular and flat, over the entire length of rigid frame. The end pockets are made up by the side walls, for example 91a (for the end right), upper 94a, lower 95a, and by a flap rear 92a (shown in dotted lines).

Figure 3b illustrates another possible form of panel 1b. The main front wall 90b of the fabric 9b is plane. The hoops (not visible) are curved backwards and the side walls, for example 91a, are flat and form ellipse portions. The main face before 90b of the fabric 9b is flat.

FIG. 3c illustrates a form of panel 1c, completely flat. The main front wall 90c of the fabric 9c is planar, as are the side walls, for example 91c, and the upper walls 94c and lower 95c.

The preferred application of the support device canvas according to the invention is the production of panels advertising, signs or similar wall structures.

Figure 4 schematically illustrates a sign wall for store including a support device 1 according to the invention. More precisely, and to fix the ideas, the panel 1 forming the sign is of the type (convex shape) described with reference to Figures 1a to 2f. We have fixed on the wall M of the store three vertical slides 7 along which the device itself slides, as explained with reference to FIG. 1a, using cables 8 (not shown). As it was also indicated, it is possible in particular to provide light sources to inside the structure of panel 1 (if the canvas is diffusing) to obtain a light box.

On reading the above, we can easily see that the invention does achieve the goals it has set for itself.

It should be clear, however, that the invention is not not limited to only examples of achievements explicitly described, in particular in relation to FIGS. 1a to 4.

First, the materials used, and including the cover fabric, depend on the specific application envisaged. The same is true of dimensions, nature and sections of the tubes and uprights making up the foldable rigid frame: frame, etc. The number of suspension rails, three in examples described may be different, and especially higher for very long panels. In this case, the horizontal link has hooking parts intermediates inserted in the grooves of the slides.

It is also possible, in particular for panels of very long, provide two or more axes of rotation. By way of example, in an alternative embodiment not shown, a fixed central frame and two frames are provided end mechanically connected to the central frame by two axes of rotation.

The axis of rotation may also not be orthogonal to the longitudinal axis of the panel.

On the other hand, even if the cover configuration of the cover fabric is very advantageous, because of simple implementation and allowing time for removal and / or very short exposure, the invention remains compatible with other configurations, for example configurations called "in sock ", provided that holes remain for the passage of locking devices and parts hooking. For example, we can use more conventional solutions of fabrics subject to the rear by elastic tensioners.

The two frame ends, and in particular the hoops, can be of different shapes. Likewise, frames themselves can have forms that differ from the rectangular shape.

Finally, as indicated, the concepts on the right or left, or vertical, are purely arbitrary. It is notably possible, without going outside the framework of the invention, to design a vertical panel which is would fold and unfold around a horizontal axis.

Claims (10)

1. Supporting device (1) for a stretched banner (9) including a rigid framework, said banner (9) covering at least one so called main face of this framework, characterized in that said framework includes two frames (2g, 2d) rotatingly movable around an axis (20) such that said both frames (2g, 2d) are able to be in a first, so called unfolded, spatial position, wherein they substantially are located in an extension of one another and have a maximal clearance, and a second, so called folded, spatial position wherein both frames form between them an angle of a determined magnitude, and in that said banner includes hooking means (91, 92) allowing its being stevedored on the frames (2g, 2d) when such are in their said folded position, and in that said banner is automatically stretched when both frames (2g, 2d) are reverted to said unfolded position, with the ends of both frames (2g, 2d) exerting a longitudinal tensile force on it in this unfolded position.
2. Device as claimed in claim 1, characterized in that said banner (9) is shaped as a slip-on cover with pockets (91, 92) at each end, and in that these pockets (91, 92) constitute said hooking means allowing the stevedoring of said banner (9) on said frames (2g, 2d) when such are in their said folded position, by being slipped upon the ends (8) of said frames opposite said rotation axis (20).
3. Device as claimed in claim 2, characterized in that each of said frames (2g, 2d) has, at the end thereof opposite said rotation axis (20), an arch (27, 43) of a predetermined shape, substantially orthogonal to the frame (2g, 2d), so as to impose this predetermined shape to a main surface (90) of the banner (9) in said determined stretched state.
4. Device as claimed in any of claims 1 to 3, characterized in that it includes for each of said frames (2g, 2d) a blocking member (6g, 6d, 61) so as to obtain a reversible locking of these frames (2g, 2d) in said unfolded position, and in that each blocking member consists of a rotating axis (60, 601, 602) having a hook (600) and actuated by a handle (603), with said hook (600) interlocking on a pole (61, 610) integral with the frame (2g, 2d) associated with the blocking member.
5. Device as claimed in claim 1 or 4, characterized in that the device (1) is designed for being arranged against a vertical plane (M), and adjustable members (7, 8) are designed for suspending and lifting said framework in a determined position of said vertical plane (M), in that said suspending members include slides (7) hooked on this plane (M), and hooking parts (604, 605, 203) integral with said blocking member (601, 602) and/or with said rotation axis (20), and in that cables (8) acting on these hooking parts (604, 605, 203) are designed for causing said lifting.
6. Device as claimed in claim 5, characterized in that it further includes a mechanical link bar (5) of said hooking parts (604, 605; 203).
7. Device as claimed in claim 6, characterized in that for each of said frames (2g, 2d), a compass (3g, 3d) is arranged such that one of the legs (30) thereof is linked with said mechanical link bar (5) and the other leg (31) is linked with the frame associated with it, an in that said compasses (3g, 3d) are closed in said unfolded position of the frames (22, 24) and opened in said folded position thereof, so that the angle formed by both frames (2g, 2d) is limited to said determined magnitude angle.
8. A device according to any of claims 1 to 7, characterized in that at least one of said frames (2d) is divided into a first sub-frame (23, 24, 26) mechanically linked with the other frame (2g) by said rotation axis (20) and a second sub-frame (41, 42, 44, 45) located in the extension of said first frame (23, 24, 26) and in that it includes relative adjustment means (410, 420) allowing a sliding of said second frame with respect to the first frame so as to obtain an adjustment of the total length of said subdivided frame (2d) and an adjustment of said stretched state of the banner (9) in a said unfolded position of the frames (2g, 2d).
9. Device as claimed in claim 8, characterized in that threaded or spring type adjustment members (40a, 40b) are arranged between said first (23, 24, 26) and second (41, 42, 44, 45) frames for adjusting said total length of the divided frame (2d) within a range extending from zero up to a maximal adjustment value.
10. Application of a device as claimed in any of the previous claims for realizing wall advertising signboards (1) or panels.

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