WO2008148916A1 - Expanding device for self-expandable foldable display case and self-expandable foldable display case - Google Patents

Abstract

The display case comprises a foldable structure (10) with two panels (11, 12) facing each other and joined by the side edges thereof. Between the panels is an expander device which comprises a first laminar body (30) with opposed first and second edges (31, 31) and at least one portion for insertion (34) which extends between at least one intermediate check edge (33) and one of said first and second edges, and a second laminar body (40) with opposed first and second edges (41, 42) and a slot (43) between said first and second edges. The insertion portion is inserted in the slot and the slot (43) and the checking edge (33) define a line of fulcrum along which the first and second laminar bodies (30, 40) can pivot with respect to each other towards an expanded position in cooperation with an elastic band.

Description

 EXPANSOR DEVICE FOR SELF-EXPANDABLE FOLDING EXHIBITOR AND SELF-EXPANDABLE FOLDING EXHIBITOR

Field of the technique The present invention concerns an expander device made from two sheet bodies, of a material such as cardboard, corrugated cardboard, plastic, and corrugated plastic, among others, applied to the expansion of a composite self-expanding folding display by two or more panels facing each other and joined by their side edges, and in a collapsed situation they adopt a flat configuration, and in a service position they adopt a three-dimensional configuration capable of standing upright.

The present invention also concerns a self-expanding folding display equipped with such an expanding device.

Background of the invention International patent application WO 2006/067252 A1 discloses a collapsible self-expanding display and a pushing element for its expansion. This display comprises a structure formed by two or more facing panels and joined by their respective lateral edges by elastic bands hooked on prominent fins of the panels. The structure can be arranged in a collapsed situation, in which it adopts a flat configuration, and from said collapsed situation, and in cooperation with expansion means including one or more thrust elements actuated by one or more elastic traction elements, The exhibitor can automatically move to a service position in which the structure adopts a three-dimensional configuration capable of standing upright. In addition, from said collapsed situation, the display can be folded by fold lines transverse to a folded situation. Each pushing element of said expansion means is in the form of a laminar body attached to one of the panels of the structure and capable of adopting a flat position together with the panels of the structure in said collapsed situation, and the tensile element It is in the form of an elastic band with one of its ends hooked in a hitch configuration formed in the laminar body and arranged to rotate, bend or bend the laminar body between the panels of the structure and thereby cause the display to expand.

This collapsible self-expanding display and pushing element of the international patent application WO 2006/067252 A1 is fully operational. However, it is susceptible to several improvements in the Io relative to a reduction in the number of separate elements that compose it, and in the number of operations necessary for the production of its components and assembly thereof.

DISCLOSURE OF THE INVENTION According to a first aspect, the present invention provides an expander device for a self-expanding folding display. The self-expanding folding display is of the type that comprises a structure formed from at least two panels facing and joined by their side edges, and that in a collapsed situation adopt a flat configuration, and in a service position adopt a three-dimensional configuration capable of stand up The expander device is of the type comprising at least one laminar body attached to at least one of said panels, said laminar body being able to adopt a flat position together with the panels in said collapsed situation, and a tensile element arranged to rotate, curving or bending the laminar body between the panels, and thereby causing the expansion of the display structure. The expander device of the present invention is characterized in that it comprises two laminar bodies, namely: A first laminar body having opposite first and second edges, and at least one insertion portion extending between at least one abutment edge located between said first and second edges and one of said first and second edges; and a second laminar body having opposite first and second edges, and at least one slit located in an area between said first and second edges. Said insertion portion of the first sheet body is sized to be inserted into said slit of the second sheet body until said abutment edge of the first sheet body makes contact with the second sheet body. In this position, the abutment edge of the first laminar body and the slit of the second laminar body define a fulcrum line along which the first and second laminar bodies can rotate relative to each other between a flat position, in the that the first and second laminar bodies are superimposed, and an expanded position, in which the first and second laminar bodies are crossed. The first and second sheet bodies are of a relatively rigid sheet material, such as for example cardboard, corrugated cardboard, plastic, or corrugated plastic, among others, although corrugated cardboard is generally preferred. When corrugated cardboard or plastic is used, the channels provided by the corrugations are arranged in a direction perpendicular to the mentioned fulcrum line, that is, extending between the first and second edges of each laminar body. For the connection of the expander device to the structure of the display, at least one of the first and second edges of the first and second sheet bodies extends at least one connecting flap configured to be attached, for example by adhesive, to one side internal of one of the panels of the structure. Said joint flap is connected to the corresponding first or second laminar body by a fold line that facilitates the movements of the laminar body involved. In general, those pushing edges of the laminar bodies that are not associated with a binding flap slide on the inner face of one of the panels of the structure of the exhibitor during the exhibitor's expansion and collapsing processes. Depending on the number of panels and / or the configuration of the display structure, a binding flap may be provided on a pushing edge of each laminar body of the expander device for joining two different panels of the display structure, or even The four thrust edges of the two laminar bodies may be associated with respective connecting fins for joining four different panels of the display structure.

In the simplest exemplary embodiments, the tensile element of the expander device comprises a single elastic band engaged at one of its ends in a first engagement configuration formed in the first sheet body and a second end engaged in a second engagement configuration formed. in the second laminar body. Thus, said elastic band is tensioned when the expander device is arranged in the flat position, and is arranged to pull the first and second sheet bodies towards the expanded position.

In order to limit the rotation of the first and second laminar bodies so that in the expanded position they are approximately at right angles to each other, or forming any other angle that is considered convenient, at least one of the laminar bodies comprises a limiting appendix capable of making contact with the other of the laminar bodies when the expander device is in the expanded position. Advantageously, the same laminar body that incorporates the slit also has a cut that defines said limiting appendix and also the second hook configuration in the limiting appendix, with a proximal end (that is, closer to the laminar body) of the connected limiting appendix. to the first laminar body by a fold line that facilitates the movements of the limiting appendix in relation to the laminar body. The elastic element is engaged in the first and second engagement configurations so that the limiting appendix is linked with the elastic element and is raised together with it as the expander device moves from the flat position towards the expanded position. In addition, the limiting appendix has a distal edge (that is, farther from the laminar body to which it is attached) wider than the first coupling configuration formed in the other laminar body, and a portion of the elastic band adjacent to the first configuration of engagement makes contact with said distal edge of the limiting appendix preventing further movement thereof during the evolution of the expander device from the flat position to the expanded position to establish the limit position of the limiting appendix corresponding to the expanded position.

In this expanded position, the expander device has, with only two crossed laminar bodies, a three-dimensional configuration of large volume, with up to four edges, that is, the first and second edges of the first sheet body and the first and second edges of the second body laminate, separated to the maximum and arranged to press against the two or more panels of the structure of the exhibitor from the inside to expand it. In addition, the mentioned fulcrum line is located in an approximately central section of the two sheets, which implies that each laminar body has in practice two lever arms substantially of the same length, one between the fulcrum line and the first edge and the other between the fulcrum line and the second edge.

Thanks to its construction, the expander device of the present invention provides a number of advantages over the thrust elements of the prior art, including the following.

The pushing forces are divided into four substantially symmetrical points, which provides a more balanced expansion of the structure of the display.

The sliding path made by some of the thrust edges of the expander device on the internal surfaces of the panels of the display structure during the exhibitor's expansion and collapsing processes are relatively small, which results in a smooth sliding both when collapsing. as when expanding the exhibitor. Optionally, the laminar bodies may have a few indented lines parallel to and near the thrust edges to produce a slight curvature thereof when they push on the display panels and thereby produce a smoothing effect of the slide.

Thanks to the cross arrangement of the laminar bodies, the same volume of expansion of the display can be achieved with lever arms (between the first and second thrust edges of the laminar bodies and the fulcrum line) relatively short, which results in greater robustness of the expander device. According to a second aspect, the present invention provides a self-expanding folding display of the type that comprises at least one structure formed from at least two panels facing and joined by their lateral edges, and that in a collapsed situation adopt a flat configuration, and in a service position they adopt a three-dimensional configuration capable of being held upright, and at least one expander device disposed between said panels. The self-expanding folding display of the present invention is characterized in that said expander device has the essential characteristics of the expander device of the first aspect of the present invention described above. The two or more panels that make up the structure of the display according to an embodiment of the present invention are formed from a single piece of sheet material, in which the panels are arranged in parallel and connected to each other by lines of longitudinal fold that delimit the mentioned lateral edges of the panels, except some extreme lateral edges of the extreme panels. From a side end edge of one of said end panels extends a connecting flap connected to said piece of sheet material by a longitudinal fold line that facilitates its bending. This connecting flap is arranged to be attached, for example by adhesive, to the extreme side edge of the other end panels. Said piece of sheet material further comprises transverse fold lines perpendicular to said longitudinal fold lines and which run through all the panels. When the display is assembled, these transverse fold lines allow a folding of the structure from the aforementioned collapsed situation to a folded situation. In addition, to facilitate the folding of the display and avoid tearing at the edges, each of the transverse fold lines is composed of at least three, and preferably at least four, adjacent transverse fold lines, said joint fin is interrupted in the areas where the transverse crease lines meet the extreme side edge of the corresponding end panel, and the longitudinal crease lines are aligned with longitudinal cuts in crossing areas with the transverse crease lines.

With this construction based on a single piece of sheet material, the manufacturing, handling and storage costs of the exhibitor structure are significantly lower compared to other prior art exhibitors constructed from separate panels joined by their side edges by elastic bands hooked in fins folded inwards. Further, given that usually the external surfaces of the display panels have printed graphic information, the display of the present invention allows the printing of all the panels by means of a single printing operation of the piece of sheet material instead of a printing operation for each individual panel, as with the prior art exhibitors, which entails significant savings in printing and handling costs.

According to an example of embodiment, the structure of the display is formed by two panels facing and joined by side edges, and in the expanded situation it adopts a convex configuration of elliptical or ogival cross-section, which in an extreme case may even become practically circular According to other embodiments, the structure of the display can be formed by a variable number of panels joined by its lateral edges, and which in the expanded situation adopt a prismatic configuration of flat faces, whose cross section is preferably a polygon with an even number sides, for example a rectangle, a square or a regular or irregular hexagon, where at least two of the larger panels are facing each other. In accordance with another embodiment, the structure of the display comprises two or more panels, including two opposite larger panels, one of which is convex arched and the other is flat when the display adopts the expanded situation. With the majority of examples of embodiment of the structure of the display described above, the expander device can be attached to at least one of the panels in a position such that said fulcrum line is substantially parallel to said side edges of the panels. However, it is also possible to attach the expander device to the structure in a position such that said fulcrum line is substantially perpendicular to the said side edges of the panels. This horizontal arrangement of the fulcrum line is suitable when the structure comprises, for example, two opposite panels, at least one of which is of convex arched configuration, in which case the first and / or second edges of the first and second bodies The laminar expander device is curved-convex, which helps to form and maintain said convex arched configuration of one or both opposite panels of the structure. When the structure comprises two panels of larger, opposite, flat configuration, it is also suitable to arrange the expander device with the horizontal fulcrum line and with the first and second edges of the first and second rectilinear laminar bodies to help maintain said configuration flat of the two opposite panels of the structure. The horizontal layout of the fulcrum line is also suitable when the structure comprises two opposite larger panels, one of which is of convex arched configuration and the other is flat, in which case the first edges of the first and second laminar bodies of the expander device are curved-convex according to said convex arched configuration of one of the opposite panels of the display and the second edges of the first and second sheet bodies of the expander device are rectilinear according to said flat configuration of the other of the opposite panels of the structure.

In the case of an exhibitor that in the expanded position has a flat major face and in which the fulcrum line of the expander device is arranged in a horizontal position, the binding flap is formed in one of said rectilinear edges of one of the laminar bodies of the expander element. In addition, the laminar body involved has a widened area such that said rectilinear edge has a length that covers all or a substantial part of the width of the flat panel, or one of the flat panels, of the structure. The binding fin is attached to the internal surface of this flat panel of the structure. With this arrangement, when the structure of the exhibitor adopts the expanded situation, the binding fin and the laminar body to which it is connected form a dihedral angle that constitutes a significant reinforcement to maintain the flat configuration of the flat panel of the exhibitor.

According to another particular embodiment of the display of the present invention, the display comprises at least two structures and an additional panel that extends from one to another of said two structures. Each of the two structures includes at least two opposite larger panels, and at least one of the two larger panels is a flat panel in the expanded situation. Said additional panel has a first side edge attached to a side edge of the flat panel of one of said two structures and a second side edge attached to a side edge of the flat panel of the other of said two structures. Both structures can be arranged with their respective flat panels mutually aligned and in turn aligned with the additional panel to jointly form a large mural, suitable, for example, as a support for a large digital print. Obviously, following this example, exhibitors could be built to form larger murals starting from a number n of structures and an n-1 number of additional panels, with each additional panel extending between each of the two structures.

Additionally, the display includes one or more shelves, each of which comprises a folding shelf, a shrinkable reinforcement member located under the shelf panel, and an elastic element to contract the reinforcing member in the expanded situation.

Brief description of the drawings The foregoing and other features and advantages will be more fully understood from the following detailed description of some examples of embodiment with reference to the attached drawings, in which: Figs. 1A and 1 B are plan views of first and second laminar bodies, respectively, which are part of an expandable device for self-expanding folding display in accordance with a first embodiment of the first aspect of the present invention;

Fig. 2 is a perspective view of the expander device of the first embodiment formed from the first and second sheet bodies of Figs. 1A and 1 B assembled and pulled by an elastic band; Figs. 3 and 4 are plan views of the expander device of the first embodiment applied to a self-expanding folding display of ogival cross section and a self-expanding folding display of square cross section, respectively; Figs. 5A and 5B are plan views of first and second laminar bodies, respectively, which are part of an expandable device for self-expanding folding display in accordance with a second embodiment of the first aspect of the present invention;

Fig. 6 is a perspective view of the expander device of the first embodiment formed from the first and second sheet bodies of Figs. 5A and 5B assembled and pulled by an elastic band;

Fig. 7 is a plan view of the expander device of the second embodiment applied to a self-expanding folding display comprising two opposite panels of convex arched configuration that determine an ogival cross section; Figs. 8A and 8B are plan views of first and second laminar bodies, respectively, which are part of an expandable device for self-expanding folding display in accordance with a third embodiment of the first aspect of the present invention; Figs. 9 and 10 are plan and perspective views, respectively, of the expander device of the third embodiment applied to a folding display self-expanding comprising two opposite panels, one of which is convex arched and the other is flat;

Fig. 11 is a perspective view of an expander device formed from first and second sheet bodies assembled and pulled by an elastic band according to a fourth embodiment of the first aspect of the present invention;

Fig. 12 is a perspective view of an expander device according to a variant of the fourth embodiment;

Fig. 13 is a plan view of the expander device corresponding to the variant of the fourth embodiment of Fig. 12 applied to a self-expanding folding display of hexagonal cross-section; Figs. 14A and 14B are plan views of first and second laminar bodies, respectively, which are part of an expandable device for self-expanding folding display according to a fifth example of embodiment of the first aspect of the present invention;

Fig. 15 is a perspective view of the fifth embodiment of the expander device formed from the first and second laminar bodies of Figs. 14A and 14B assembled and pulled by an elastic band;

Fig. 16 is a plan view of the expander device of the fifth embodiment of Fig. 15 applied to a self-expanding folding display of ogival cross section; Figs. 17 and 18 are plan and perspective views, respectively, of a variant of the expander device of the fifth embodiment applied to a cylindrical self-expanding folding display, that is, of circular cross-section; Figs. 19A and 19B are plan views of first and second laminar bodies, respectively, which are part of an expandable device for self-expanding folding display in accordance with a sixth embodiment of the first aspect of the present invention;

Fig. 20 is a perspective view of the expander device of the sixth embodiment formed from the first and second sheet bodies of Figs. 19A and 19B assembled and pulled by an elastic band;

Fig. 21 is a plan view of the expander device of the sixth embodiment applied to a self-expanding folding display of irregular hexagonal cross-section, with two large flat panels facing each other; Figs. 22A and 22B are plan views of first and second laminar bodies, respectively, which are part of an expander device for display folding self-expanding according to a seventh example of embodiment of the first aspect of the present invention;

Fig. 23 is a perspective view of the expander device of the seventh embodiment formed from the first and second laminar bodies of Figs. 22A and 22B assembled and pulled by an elastic band; Figs. 24A and 24B are plan views of first and second laminar bodies, respectively, which are part of an expandable device for self-expanding folding display according to an eighth example of embodiment of the first aspect of the present invention; Fig. 25 is a perspective view of the expander device of the eighth embodiment formed from the first and second sheet bodies of Figs. 24A and 24B assembled and pulled by an elastic band; Figs. 26A and 26B are plan views of first and second laminar bodies, respectively, which are part of an expandable device for self-expanding folding display according to a ninth example of embodiment of the first aspect of the present invention;

Fig. 27 is a perspective view of the expander device of the ninth embodiment formed from the first and second sheet bodies of Figs. 26A and 26B assembled and pulled by an elastic band; Figs. 28A and 28B are plan views of first and second laminar bodies, respectively, which are part of an expandable device for self-expanding folding display in accordance with a tenth embodiment of the first aspect of the present invention;

Fig. 29 is a plan view of the expander device of the tenth embodiment example formed from the first and second laminar bodies of Figs. 28A and 28B assembled and pulled on opposite sides by two elastic bands, applied to a self-expanding folding display with an ogival cross section;

Fig. 30 is a plan view of a single piece of sheet material provided with fold lines for the formation of the panels of a self-expanding folding display of ogival cross-section according to a first embodiment of the second aspect of the present invention;

Fig. 3OA is an enlarged view of detail A of Fig. 30; Fig. 3OB is an enlarged view of detail B of Fig. 30; Fig. 31 is a perspective view of the display of the first embodiment with indication of details A and B; Fig. 32 is a perspective view that illustrates the display of the first embodiment in a collapsed and partially folded situation; Fig. 32A is an enlarged view of detail A of Fig. 32; Fig. 33 is a perspective view of a self-expanding folding display in accordance with a second embodiment of the second aspect of the present invention, including an expander device that provides a support foot;

Fig. 34 is a perspective view of the expander device that provides a support foot and that is part of the display of the second embodiment of Fig. 33; Fig. 35 is a perspective view of a self-expanding folding display in accordance with a third embodiment of the second aspect of the present invention, configured to provide a large mural; Figs. 36A, 36B and 36C are perspective views showing the display of the third embodiment in different positions corresponding to different collapsing and folding phases; Figs. 37, 38, 39 and 40 are perspective views showing the construction and folding operation of a shelf according to an embodiment adapted to be installed in a self-expanding folding display of the present invention; Figs. 41, 42 and 43 are perspective views showing the construction and folding operation of a shelf according to another embodiment adapted to be installed in a self-expanding folding display of the present invention; Figs. 44A and 44B are plan views of first and second laminar bodies, respectively, which are part of an expandable device for self-expanding folding display according to an eleventh example of embodiment of the first aspect of the present invention;

Fig. 45 is a perspective view of the expander device of the eleventh exemplary embodiment formed from the first and second laminar bodies of Figs. 44A and 44B assembled and pulled on opposite sides by elastic bands;

. FIG 46 is a plan view of the expander of the eleventh embodiment in the position expanded Ia ^'Fig . 45; Figs. 47A and 47B are plan views of first and second laminar bodies, respectively, which are part of an expander device for display folding self-expanding according to a twelfth example of embodiment of the first aspect of the present invention;

Fig. 48 is a perspective view of the expander device of the twelfth embodiment formed from the first and second laminar bodies of Figs. 47A and 47B assembled and pulled on opposite sides by elastic bands;

Fig. 49 is a plan view of the expander device of the twelfth embodiment in the expanded position of Fig. 48 applied to a self-expanding folding display of substantially rectangular cross-section; Fig. 50 is a plan view of the self-expanding folding display and the expander device of the twelfth embodiment of Fig. 49 in an almost collapsed position;

Fig. 51 is a plan view of a variant of the expander device of the twelfth embodiment in the expanded position applied to a self-expanding folding display of substantially rectangular cross-section;

Fig. 52 is a plan view of another variant of the expanding device of the twelfth embodiment in the expanded position applied to a self-expanding folding display of substantially rectangular cross-section; Figs. 53 and 54 are perspective views of a self-expanding folding display of substantially hexagonal cross-section equipped with an expander device such as that of Fig. 52 and provided with a table top board, in open and closed positions, respectively; Figs. 55, 56 and 57 are plan views that respectively illustrate additional embodiments of the expander device of the present invention in the expanded position, applied to self-expanding folding displays of substantially elliptical cross-section;

Fig. 58 is a perspective view of a folding stiffening element in an expanded position applicable to any of the self-expanding folding exhibitors of the present invention provided with at least one flat panel; and Figs. 59 and 60 are profile views of the folding stiffening element of Ia

Fig. 58 in expanded and collapsed positions, respectively.

Detailed description of some embodiments

Referring firstly to Figs. 1A, 1 B and 2, the expandable device for self-expanding folding display comprises, according to a first embodiment of the first aspect of the present invention, a first body sheet 30, shown separately in Fig. 1A, and a second sheet body 40, shown separately in Rg. 1 B. These first and second laminar bodies 30, 40, of a material such as cardboard, corrugated cardboard, plastic, and corrugated plastic, among others. The first laminar body 30 has opposite first and second edges 31, 32, and a stop edge 33 located between said first and second edges 31, 32 and substantially parallel thereto. An insertion portion 34 extends between said abutment edge 33 and the second edge 32. Said insertion portion 34 of the first laminar body 30 is located between two portions of said abutment edge 33 and comprises retention configurations 38 adjacent to said portions of the abutment edge 33. The second laminar body 40 has opposite first and second edges 41, 42, and a slit 43 located in a middle area between said first and second edges 41, 42. The mentioned insertion portion 34 of the first laminar body 30 is sized to be inserted in said slit 43 of the second laminar body 40 until said abutment edge 33 of the first laminar body 30 makes contact with the second laminar body 40, as shown in Fig. 2. In this position, the abutment edge 33 and the slit 43 define a fulcrum line along which the first and second laminar bodies 30, 40 can rotate with respect to each other between a pos flat ion (not shown), in which the first and second laminar bodies 30, 40 are superimposed, and an expanded position (Fig. 2), in which the first and second laminar bodies 30, 40 are crossed. In said flat position, the first edge 31 of the first sheet body 30 is substantially adjacent to the first edge 41 of the second sheet body 40 and the second edge 32 of the first sheet body 30 is substantially adjacent to the second edge 42 of the second sheet body 40. Said retention configurations 38 formed in the base of the insertion portion 34 of the first sheet body 30 contribute to keeping the insertion portion 34 in position within the slit 43 of the second sheet body 40.

From the second edge 32 of the first laminar body 30 extends at least one connecting flap 35 intended to be attached, for example, by adhesive, to an internal face of one of the panels 11, 12 forming a structure 10 of the folding display self-expanding, as described below. This connecting flap 35 is connected to the corresponding first laminar body 30 by a fold line 35a. It will be understood that, alternatively, the binding flap 35 could extend from any other of the first and second edges of any of the first and second laminar bodies with an equivalent result, or there could even be more than one binding fin on one and / or other of the first and second laminar bodies, as will be seen later.

The first laminar body 30 has a first hook configuration 36 formed, for example, by die-cutting therein and the second laminar body 40 has a second hook configuration 46 also formed, for example, by die-cutting. As shown in Fig. 2, the expander device of this first embodiment includes a tensile element materialized by an elastic band 5 hooked at its ends in said first and second engagement configurations 36, 46, so that the tensile element 5 pulls the first and second laminar bodies 30, 40 leading them towards the other towards the expanded position.

In this first embodiment, the second laminar body 40 comprises a limiting appendix 47, formed by die-cutting, capable of making contact with the other of the first and second laminar bodies 30, 40 to limit the rotation formed by them when they are attracted by the traction element 5 in the expanded position. Thus, the second laminar body 40 has a cut that defines both the limiting appendix 47 and the second hitch configuration 46, with the second hitch configuration 46 formed in the limiting appendix 47 near the base thereof. The limiting appendix 47 has a proximal end connected to the second laminar body 40 by a fold line 47a and a distal edge 47b wider than the first hook configuration 36 of the first laminar body 30, so that the elastic band 5 engaged in the First engagement configuration 36 cooperates with said distal edge 47b of the limiting appendix 47 acting as a stop to establish the limit position of the limiting appendix 47 corresponding to the expanded position. In this first embodiment, the fold line 47a that connects the limiting appendix 47 to the second laminar body 40 is located between the slit 43 and the second edges 42 of the second laminar body 40 that is adjacent to the second edge 32, that is, to the insertion portion 34, of the first laminar body 30 in the flat position, with the fold line 47a adjacent to the slit and the distal edge 47b adjacent to the second edge 42 of the second laminar body 40.

Fig. 3 shows the expander device according to the first embodiment of the present invention applied to a self-expanding folding display comprising a structure 10 formed from two panels 11, 12, of a material such as cardboard, corrugated cardboard, plastic, and corrugated plastic, facing and joined by their lateral edges 16, 17, which, in a collapsed situation adopts a flat configuration, and in a service position adopts a configuration three-dimensional capable of standing tall. In addition, the panels 11, 12 of the structure 10 of the display include transverse fold lines 18 (see, for example, Figs. 30 and 31) perpendicular to their lateral edges 16, 17 to facilitate folding the display from said collapsed situation to a folded situation (Fig. 32). The expander device is disposed within the structure 10 of the display and is capable of adopting its flat position together with the panels 11, 12 in said collapsed situation. When the expander device, by effect of the pulling element 5, adopts the expanded position, the first and second edges 31, 32; 41, 42 of the first and second laminar bodies 30, 40 that compose it press the two panels 11, 12 of the structure 10 of the display from the inside so that the display adopts a three-dimensional configuration of oval or ogival cross-section. It will be observed that the expander device is connected to the display in such a way that said fulcrum line of the expander device is arranged in a direction parallel to the lateral edges 16, 17 of the panels 11, 12 that form the structure 10 of the display. Preferably, the display includes several expander devices, for example, one for each of the sections in which the transverse fold lines 18 divide the panels 11, 12.

In the first exemplary embodiment illustrated in Fig. 2, the expander device has connecting fins 35 on the second edges 32, 42 of both first and second laminar bodies 30, 40 for joining both panels 11, 12 of the structure 10, although a single binding fin 35 on an edge of only one of the first and second laminar bodies 30, 40 for joining one of the two panels 11, 12 of the structure 10 would be sufficient. The first and second edges 31, 32; 41, 42 of the first and second laminar bodies 30, 40 of the expander device that do not have a binding flap 35 attached to the panels 11, 12 of the display slide on the inner faces thereof during the operations of folding and unfolding the structure 10 of the exhibitor.

In Fig. 4 the expander device is shown in accordance with the first embodiment of the present invention applied to a self-expanding folding display comprising a structure 10 formed from four panels, of a material such as cardboard, corrugated cardboard, plastic, and corrugated plastic, joined to each other by their lateral edges and faced two by two, that is, with two of the panels 11, 12 mutually facing each other and two of the panels 54, 55 mutually facing each other. The display of Fig. 4 can adopt, in a collapsed situation, a flat configuration in which the panels 11, 12 are superimposed on the panels 54, 55, respectively, and, in a service position, a three-dimensional configuration of substantially square cross section capable of standing upright. Here, the expander device is disposed within panels 11, 12, 54, 55 of the display, with the fulcrum line of the expander device arranged in a direction parallel to the side edges of panels 11, 12, 54, 55 of Ia Exhibitor structure 10. Thus, each of the first and second edges 31, 32; 41, 42 of the first and second laminar bodies 30, 40 press from within one of the four panels 11, 12, 54, 55 of the structure 10 of the display. Here there is no inconvenience in that all the first and second edges 31, 32; 41, 42 of the first and second laminar bodies 30, 40 have connecting fins 35 adhered to the respective panels 11, 12, 54, 55 of the structure 10 of the exhibitor since there is no relative slip between them during folding operations and deployed.

In Figs. 5A, 5B, and 6 shows a second embodiment of the expander, which only differs from the first embodiment in that, in the first sheet 30, the first engagement configuration 36 is formed in the first edge 31 and , in the second laminar body 40, the fold line 47a connecting the limiting appendix 47 to the second laminar body 40 is adjacent to the second edge 42 thereof and the distal edge 47b of the limiting appendix 47 is between the slit 43 and the first edge 41, so that the limiting appendix 47 crosses the slit 43 and the slit 43 is divided into two portions on the side and side of the limiting appendix 47. Thus, the limiting appendix 47 may be longer and the first and second engagement configurations. 36, 46 are further distanced from each other and the elastic band 5, which is of greater length, pulls the first and second laminar bodies 30, 40 from areas closer to their respective edges 31, 42.

In Fig. 7 the expander device of the second embodiment example is shown applied to a self-expanding folding display with a structure 10 formed by two panels 11, 12 facing and joined by its side edges, details of whose construction are part of the present invention and will be explained in greater detail below in relation to Figs. 30 and 31. In the example of application of Fig. 7, the expander device is placed between the panels 11, 12 of the structure 10 of the display with the fulcrum line in a vertical position, that is, parallel to the lateral edges of panels 11, 12 of the exhibitor.

In relation to Figs. 8A, 8B, 9 and 10 an expanding device according to a third embodiment of the present invention intended to be installed in a self-expanding folding display whose structure 10 comprises two opposite panels 11, 12, one of which is described below. , in the expanded position, is convex arched configuration while the other is flat, as is shown in Figs. 9 and 10. To this end, the expander device of the third embodiment differs from the second embodiment in that the second edge 32 of the first sheet body 30 and the first edge 41 of the second sheet body 40 are curved-convex according to said convex arched configuration of one of the opposing panels 12 of the display, and the first edge 31 of the first laminar body 30 and the second edge 42 of the second laminar body 40 are rectilinear according to said flat configuration of the other of the opposite panels 11 of Ia structure 10. In addition, the connecting flap 35 is formed on the rectilinear edge 42 of the second laminar body 40 of the expander device. The first rectilinear edge 31 of the first laminar body 30 as well as the second rectilinear edge 42 of the second laminar body 40 and the corresponding joint flap 35 have an extended length to cover all, or at least a substantial part of the width of the flat panel 11 of the structure 10, and the connecting flap 35 is attached to the internal surface of said flat panel 11, 12 of the structure 10 in a position such that said fulcrum line of the expander device is substantially perpendicular to said side edges of the panels 11, 12. In the expanded situation, the dihedral formed by the second laminar body 40 and the connecting flap 35 constitutes a reinforcement profile that cooperates in maintaining the flat configuration of the panel 11 of the structure 10 of the display.

In Fig. 11 an expander device is shown in accordance with a fourth embodiment similar to the third embodiment, but which differs from it essentially in that here, the second edge 33 of the first laminar body 30 and the first edge 42 of the Second laminar body 40 are also rectilinear, which makes the expander device of the fourth exemplary embodiment suitable for a self-expanding folding display that has two flat panels facing each other. Also here, from the second edge 42 of the second laminar body 40 extends a connecting flap 35, which, in an operative situation, is attached to the internal surface of said flat panel 11, 12 of the structure 10 in a position such that The fulcrum line of the expander device is substantially perpendicular to the mentioned side edges of the panels 11, 12. In Fig. 12 it shows an expander device according to a variant of the fourth embodiment, which is adapted to be installed in a self-expanding folding hexagonal cross-section display, as shown in Fig. 13. The folding self-expanding hexagonal cross-section display has a structure 10 formed by six flat panels joined to each other by their side edges and facing two to two. Between the panels the expander device is installed in accordance with this variant of the fourth embodiment, which differs thereof only in that the first edge 31 of the first laminar body 30 and the first and second edges 41, 42 of the second laminar body 40 all have the same length substantially equal to the width of two of the facing panels 11, 12 of the structure 10 of the exhibitor. From the second edge 42 of the second laminar body 40 extends a connecting flap 35, which, in operative situation, is attached to the internal surface of one of the facing flat panels 12 of the structure 10 in a position such that the line of fulcrum of the expander device is substantially perpendicular to said side edges of the panels 11, 12. Thus, in the expanded situation shown in Fig. 13, the second edge 32 of the first sheet body 30 and the first edge 41 of the second body sheet 40 press against the inner face of one of the facing panels 11 of the structure 10 of the display and the first edge 31 of the first sheet body 30 and the second edge 42 of the second sheet body 40 press against the inner face of the other of the panels faced 12 of the structure 10 of the exhibitor, collaborating in the maintenance of the flat configuration thereof.

In Figs. 14A, 14B, 15 an expander device is shown according to a fifth embodiment very similar to the second embodiment, which basically differs in that all opposite edges 31, 31, 41, 41 of the first and second sheet bodies 30, 40 are curved-convex. This is so because, unlike the expander device of the second embodiment, the expander device of the fifth embodiment is intended to be installed in an exhibitor composed of an ogival cross-sectional structure 10 but with the fulcrum line of the expander device arranged in a horizontal position, as shown in Fig. 16. For this, from the second edge 32 of the first laminar body 30 extends a connecting flap 35 that is attached to an internal face of one of the panels 11, 12 of the structure 10 of the exhibitor. In this case, the curved convex edges 31, 31, 41, 41 of the first and second laminar bodies 30, 40 of the expander device cooperate in maintaining the arched configuration of the facing panels 11, 12 of the structure 10 of the display in The expanded situation. In Figs. 17 and 18 show an expander device according to a variant of the fifth embodiment, especially designed to be installed in a self-expanding folding display with an elliptical or circular cross-section. The difference with respect to the expander device of the fifth embodiment is essentially in the profile of the curved-convex edges of the first and second laminar bodies 30, 40 adapted to the specific arched configuration of the cylindrical display Here, the fulcrum line of the expander device is arranged in a horizontal position, as shown in Fig. 18.

In relation to Figs. 19A, 19B and 20 an expander device is now described in accordance with a sixth exemplary embodiment intended to be installed in a self-expanding folding display provided with a structure 10 with two large flat panels 11, 12 facing each other, such as the display shown in Fig. 21, in which the structure 10 is formed by six panels joined to each other by their lateral edges, two of which, namely, panels 11 and 12, are large panels that in Ia Expanded situation are faced and parallel. The expander device of this sixth embodiment is similar to the second embodiment with the difference that here, the first and second sheet bodies 30, 40 are attached to respective first and second sheets 3, 4 configured to be attached to faces internal two panels 11, 12 facing the structure 10 of the display. Thus, the first sheet body 30 is formed by cutting lines in said first sheet 3 and is connected to the first sheet 3 by a fold line 3a along the first edge 31. Similarly, the second sheet body 40 is formed by cutting lines in said second sheet 4 and is connected to the second sheet 4 by a fold line 4a along the first edge 41. When the insertion portion 34 of the first sheet body 30 is inserted in Ia slit 43 of the second laminar body 40 (Fig. 20) and the elastic band 5 engaged in the corresponding first and second hook configurations 36 an expander device similar to that of the second embodiment but with the first and second laminar bodies 30 is formed, 40 connected to the first and second sheets 3, 4, which, when adhered to the facing flat panels 11, 12 of the structure 10 of the display contribute to maintaining the configuration flat ation of them. In Fig. 21 the expander device of the sixth embodiment example is shown attached to the display with the fulcrum line arranged in a vertical position, parallel to the side edges of the panels of the structure 10 of the display, although this expander device would also work arranged with the fulcrum line in a horizontal position perpendicular to the lateral edges of the panels of the structure 10 of the display.

In Figs. 22A, 22B and 23 an expander device according to a seventh embodiment similar to the second embodiment example is shown except that, here, the first laminar body 30 (Fig. 22A) has a first longitudinal fold line 39 which is extends from one to the other of its first and second opposite edges 31, 32, centered with the first hitch configuration 36, and the line of fold 35a between the connecting flap 35 and the insertion portion 34 is composed of two portions of the fold line forming an angle to each other side and side of said first longitudinal fold line 39. The second laminar body 40 (Fig. 22B ) has here a second longitudinal fold line 49 extending from one to the other of its first and second opposite edges 41, 42 and along the limiting appendix 47. In addition, the slit 43 is composed of two slit portions forming an angle with each other on the side and side of said second longitudinal fold line 49, and the fold line 47a at the base of the limiting appendix 47 is composed of two portions of fold line forming an angle to each other on the side and side of said second line of longitudinal fold 49. With this construction, when the insertion portion 34 of the first laminar body 30 is inserted in the slit 43 of the second laminar body 40 and the elastic band 5 is placed When in position, the expander device is capable of adopting a flat position (not shown) with the first and second laminar bodies 30, 40 superimposed and. However, due to the effect of the tension exerted by the elastic band 5, the expander device adopts an expanded position in which both the first laminar body 30 and the second laminar body 40, including the limiting appendix 47, are folded by the first and second longitudinal fold lines 39, 49 forming respective dihedrals that give the expander device a significantly increased resistance in the expanded position. In Figs. 24A, 24B and 25 an expander device according to an eighth embodiment similar to the second embodiment example is shown except that, here, the second laminar body 40 (Fig. 24B) includes lateral fins 56 connected to the rest of the second laminar body 40 along respective fold lines 57, and the first laminar body 30 (Fig. 24A) includes appendages 58 that provide edges forming an angle with the abutment edge 33 at the side and side of the insertion portion 34. When the first and second sheet bodies 30, 40 are assembled and the elastic band 5 attracts them to the expanded position (Fig. 25), the aforementioned appendices 58 of the first sheet body 30 force said lateral fins 56 of the second sheet body 40 to bend by their respective fold lines 57 to form an angle with respect to the rest of the second laminar body 40, which gives increased resistance to the second laminar body 40 and, in general, to all The expander device.

In Figs. 26A, 26B and 27 an expander device is shown in accordance with a ninth embodiment similar to the previous ones except that, here, the first laminar body 30 only has an abutment edge portion 33, inclined, on one side of the insertion portion 34, while the opposite side has a fin 59 connected to the rest of the first laminar body 30 by a longitudinal fold line 60. For its part, the second laminar body 40 includes, on a side corresponding to the only abutment edge portion 33 of the first laminar body 30, a flap 61 connected to the rest of the second laminar body 40 by a longitudinal fold line 62, and an opening 63 in connection with an end of the slit 63 corresponding to the fin 59 of the first laminar body 30, wherein said opening 63 defines an inclined edge. When the first and second laminar bodies 30, 40 are assembled and the elastic band 5 attracts them to the expanded position (Fig. 27), the inclined abutment edge portion 33 of the first sheet body 30 forces the fin 61 of the second body laminate 40 to bend along the corresponding fold line 62 and said inclined edge of the opening 63 of the second sheet body 40 forces the fin 59 of the first sheet body 30 to bend along the corresponding fold line 60 , so that both first and second laminar bodies 30, 40 form respective dihedrals which give the expander device a significantly increased resistance.

In Figs. 28A, 28B and 29 an expander device according to a tenth embodiment similar to the second embodiment example is shown except that, here, the first laminar body 30 (Fig. 28A) includes a first additional hitch configuration 64 in a opposite end to the first hitch configuration 36 and the second laminar body 40 (Fig. 28B) includes a second hitch configuration 65 at an opposite end to the second hitch configuration 46, which allows, once the first and second bodies Laminar 30, 40 are assembled (Fig. 29), install a second elastic band 66 hooked by its ends to the first and second additional engagement configurations 64, 65 in addition to the first elastic band 5 hooked by its ends to the first and second hitch configurations 36, 46, such that the first and second elastic bands 5, 66 are arranged on opposite sides of the expander device by pulling the ends or positions of the first and second laminar bodies 30, 40. With this construction, the forces exerted by the elastic bands 5, 66 are more distributed and better balanced, which reduces the risk of unwanted folds in the first and second bodies laminar 30, 40.

In Fig. 29 the expander device of the tenth embodiment example is shown installed between the two panels 11, 12 of a structure 10 of a self-expanding folding display of ogival cross section, where the expander device is fixed so that the fulcrum line It is in a vertical direction parallel to the lateral edges of the structure 10 of the display. However, an expert in the art, he will understand that the incorporation of two elastic bands 5, 66 can be generalized to any of the expander devices of the previous embodiments, including those configured to be installed with the fulcrum line in a horizontal position perpendicular to the lateral edges of the panels of the structure 10 of the exhibitor.

In relation to Figs. 30, 31 and 32 a self-expanding folding display is described below in accordance with a first example of basic embodiment of the second aspect of the present invention. The display comprises a structure 10 formed from a piece of sheet material 20, of a material such as cardboard, corrugated cardboard, plastic, or corrugated plastic, among others, which includes, in the basic version, a longitudinal fold line 17 which delimits adjacent side edges of two panels 11, 12. From a side edge of one of the panels 12 extends a connecting flap 16 connected to said piece of sheet material 20 by a longitudinal fold line 16a and arranged to be joined to the extreme side edge of the other of the panels, so that the structure 10 (Fig. 31) comprises two panels 11, 12 facing and joined by their opposite side edges 16a, 17. Between the two panels 11, 12 of the display, an expander device of those described above is placed attached to the inner face of one or both panels by one or two of its connecting fins 35, as explained above. The tensile force of the elastic band 5 of the expander device causes the expansion of the expander device so that the first and second laminar bodies 30, 40 thereof push the panels 11, 12 of the structure 10 of the display from inside to automatically expand the display from a collapsed situation, in which the panels 11, 12 are superimposed adopting a flat configuration, to a service position or expanded situation, shown in Fig. 31, in which the panels 11, 12 adopt a three-dimensional configuration of ogival cross section capable of standing upright. By pressing the panels 11, 12 towards each other from the outside, a folding of the expander device is achieved against the force of the elastic band 5 and the adoption of the collapsed position of the display. The piece of sheet material 20 further comprises transverse fold lines 18 perpendicular to said longitudinal fold line 17 through the two panels 11, 12, and the connecting flap 16 has interruptions in the areas corresponding to the ends of the transverse fold lines 18, where the transverse fold lines 18 join the side edge 16a of the corresponding panel 12, as shown in the enlarged detail of Fig. 3OA. These transverse fold lines 18 divide the panels 11, 12 into several sections, and preferably, between each two facing sections of the panels 11, 12 an expander device is installed. The transverse fold lines 18 allow a folding of the structure 10 from the collapsed situation to a folded situation, as illustrated in Fig. 32, in which the different sections of the panels 11, 12, being in a flat configuration , are superimposed getting a compact configuration for the exhibitor, suitable for storage and transport. From the mentioned folded situation of the display, simply pulling up the upper edge of one of the two panels 11, 12, the force of the elastic bands 5 causes the expansion of the expander devices and the automatic self-expansion of the display to the position of service shown in Fig. 31.

Each of the transverse fold lines 18 is composed of at least three, and preferably four, adjacent transverse fold lines, as can be seen from the enlarged details of Figs. 3OA, 3OB and 32A. In addition, the longitudinal fold lines 17 are aligned with longitudinal cuts 19 in crossing areas with the transverse fold lines 18, as can be seen from the enlarged detail of Fig. 3OB. The various transverse fold lines 18 and the aforementioned longitudinal cuts 19 are intended to facilitate the bending of the panels 11, 12 along the transverse crease lines 18 without causing unwanted tears at the ends, as shown in the enlarged detail of Fig. 32A. The characteristics of the structure 10 of the self-expanding folding display described in relation to Figs. 30, 31 and 32 allow the structure 10 to be constructed from a single piece of sheet material joined by its extreme side edges, for example with adhesive, or by several pieces of sheet material joined by its side edges with adhesive, without need for elastic joints using elastic bands, as with the self-expanding folding displays of the prior art. Thus, separate elements and handling and assembly tasks are saved, so that the self-expanding folding display of the present invention is more economical compared to those of the prior art. It should be stressed that the characteristics described in relation to Figs. 30,

31 and 32 can be generalized to self-expanding folding displays with a greater number of panels, such as, for example, those shown in Figs. 4, 6 and 21 (of square cross-section, regular hexagonal and irregular hexagonal, respectively) among others, simply by properly dimensioning the piece of sheet material 20 and adding a required number of longitudinal fold lines 17. In general, without being essential, it is preferred that the structure 10 of the exhibitor has two opposite panels 11, 12 against the inner faces of which press the first and second laminar bodies 30, 40 of the expander devices, and these opposite panels 11, 12 can be both flat, both convex arched, or one flat and the other convex arc, as explained above.

In Fig. 33 a self-expanding folding display is shown comprising a structure 10 with two panels 1, 12 facing and joined by their side edges, of the type described above in relation to Figs. 30 and 31. In the example of Fig. 33, panels 11, 12 of structure 10 only have a transverse fold line 18 each so that they are divided into two overlapping sections, and in each section an expander device is arranged according to the fifth embodiment of the first aspect of the present invention described above in relation to Figs. 14A, 14B and 15. The difference is that, here, the second laminar body 40 of the expander device comprises at least an extension portion 37 extending from its second edges 42 and one of the panels 11 of the structure 10 of the display has formed a slit 67 near a lower end adjacent to the base thereof. In the expanded situation, said extension portion 37 of the expander device is passed through said slit 67 of panel 11 of structure 10 to make contact with the ground. Thus, the extension portion 37 of the expander device acts as a support foot that helps to hold the expanded display in the upright position.

It will be understood that, alternatively, the extension portion 37 could extend from the first edge 41 of the second laminar body 40 and / or from any of the first and second opposite edges 31, 32 of the first laminar body 30, and the slit 67 could be formed in the second panel 12 or there could be two slits 67, one in each panel 11, 12, for two extension portions 37 extending from both first and second laminar bodies 30, 40.

In relation to Figs. 35, 36A, 36B and 36C a self-expanding folding display is described below in accordance with another embodiment of the second aspect of the present invention. The display of Fig. 35 comprises two structures 10a, 10b, each of which is essentially constructed in accordance with the embodiment described above in relation to Figs. 30, 31 and 32. Thus, each of the structures 10a, 10b comprises two opposite panels 11a, 12a; 11b, 12b, and two other narrower panels between them. In the expanded situation, one of the opposite panels 11a, 11b of each structure 10a, 10b is a flat panel, and the other of the opposite panels 12a, 12b is a convex arched panel. The two structures 10a, 10b are separated and the display includes an additional panel 15 that extends from one to the other covering the gap between them. This additional panel 15 has a first side edge 15a attached to a side edge of the flat panel 10a of one of said two structures 10a and a second side edge 15b attached to a side edge of the flat panel 11b of the other of said two structures 10b. The two structures 10a, 10b configured to be arranged in a service position in which their flat panels 11a, 11b are aligned with the additional panel 15 to jointly form a large mural.

Figs. 36A, 36B and 36C illustrate a sequence of positions corresponding to different phases in a display folding operation. Preferably, the width of the additional panel 15 is approximately equal to the widths of the opposite panels 11a, 11b; 12a, 12b of the structures 10a, 10b, so that the display, from a collapsed situation, can be folded along the lateral edges 15a, 15b of the additional panel 15 to superimpose the different panels in a flat configuration. In addition, both panels 11a, 11b; 12a, 12b of the structures 10a, 10b as the additional panel 15 of the display comprise mutually aligned transverse fold lines 18 that divide the display into different overlapping sections and allow the display to be folded along the cross fold lines 18 to arrange the various overlapping sections in a flat and compact configuration suitable for the storage and transport of the exhibitor.

In Figs. 37, 38, 39, 40 shows a shelf designed to be installed in the structure 10 of any one of the exhibitors of the present invention. The shelf comprises a shelf panel 50 made of a sheet material, such as cardboard, corrugated cardboard, plastic, or corrugated plastic, among others, comprising a transverse fold line 50a defining a trailing edge 50a and a connecting flap 68 , whereby the shelf panel 50 is articulated jointly by said rear edge 50a to the inner face of one of the opposite panels, for example, the first panel 11 (schematically represented in Fig. 38) of the structure 10 of the display . A front part of the shelf panel 50 is passed through an opening 51 formed in the other panel 12 (schematically represented by dashed lines in Fig. 38) of the structure 10. Thus, the shelf panel 50 can adopt a position substantially parallel and superimposed on the panels 11, 12 of the structure 10 in the collapsed situation and a position substantially perpendicular to the panels 11, 12 of the structure 10 in the expanded situation. Under the shelf panel 50 there is provided a reinforcing member 52 made of a sheet material, such as cardboard, corrugated cardboard, plastic, or corrugated plastic, between others. This reinforcement member has several fold lines 52b substantially perpendicular to said rear edge 50a of the shelf panel 50. Two of said fold lines 52b define a joint area 52a in a central area of the reinforcement member 52, which is joined to a lower face of said shelf panel 50, so that the reinforcing member 52 can adopt a flat position superimposed on the shelf panel 50 in the collapsed situation or a three-dimensional position bent in zigzag in the expanded situation. An elastic element, such as an elastic band 53, is arranged to contract said reinforcement member 52 by zigzagging it along said fold lines 52b when the structure 10 of the display stops the situation collapsed to the expanded situation. Thus, the zigzag folds form dihedrals that confer a greater resistance to bending to the reinforcing member 52, which, in addition, in the service position of the exhibitor, is supported by its front part on an edge of said opening 51 of the panel 12 of the structure 10 of the display, and the shelf panel 50 rests on the reinforcing member 52. In Figs. 41, 42 and 43 a shelf according to a variant of the shelf described above in relation to Figs. 37, 38, 39, 40, adapted in this case to an exhibitor provided with a structure 10 of ogival cross-section. To this end, the reinforcing member 52, shown separately in Fig. 41, includes a slightly curved transverse fold line 69 defining a binding flap 70, and several longitudinal fold lines 71 substantially perpendicular to said transverse fold line 69. Two of said longitudinal fold lines 71 are located in the central part of the reinforcement member 52 defining between them a joint area 72, and the remaining longitudinal fold lines 71 are connected to a transversal fold line 69 by respective bifurcations. . The reinforcing member 52 is articulated jointly to the inner face of one of the opposite panels, for example, the first panel 11 (schematically represented in Fig. 38) of the structure 10 of the display by the connecting flap 70, so that when the structure 10 of the display is in the collapsed situation, the reinforcing member 52 is in a flat vertical position (Fig. 41). When the structure 10 of the display adopts the expanded situation, the reinforcing member 52 is folded along the transverse fold line 69 and, by virtue of the curvature acquired by the first panel 11 of the structure 10 of the display, the reinforcing member is arranged in a horizontal position with a three-dimensional configuration bent in zigzag along the longitudinal fold lines 71 (Fig. 42). In the expanded situation, a front part of the reinforcing member 52 rests on an edge of an opening 51 formed in the other panel 12 (schematically represented by dashed lines in Figs. 42 and 43) of the structure 10. The shelf panel 50 is here a simple flat panel, more or less rigid, adhered superiorly to the said joint area 72 of the reinforcement member 52, and that accompanies the reinforcement member 52 in the movements between the collapsed and expanded positions. In Figs. 44A, 44B, 45 and 46 an expander device is shown in accordance with an eleventh embodiment similar to the tenth embodiment described above, but with the difference that, here, in addition to the first limiting appendix 47 formed in the second laminar body 40, the first laminar body 30 (Fig. 44A) includes a second limiting appendix 73. The first limiting appendix 47 is connected to the second laminar body 40 by a fold line 47a adjacent to the first edge 41 and the distal edge 47b of the first appendix Limiter 47 is located between the slit 43 and the second edge 42. The second limiting appendix 73 is connected to the first laminar body 30 by a fold line 73a adjacent to the first edge 31 and the distal edge 73b of the second limiting appendix 73 is located between the abutment edge 33 and the second edge 32. At the base of the second limiting appendix 73 of the first laminar body 30 the first engagement configuration is formed che 36 and on the second edge 42 of the second laminar body 40 the second engagement configuration 46 is formed, while on the second edge 32 of the first laminar body 30 a first additional engagement configuration 64 is formed and at the base of the first appendix Limiter 47 of the second laminar body 40 is formed a second additional engagement configuration 65. From the first edge 31 of the first laminar body 30 extends a connecting flap 35 connected to the corresponding first laminar body 30 by a fold line 35a. This fin is intended to be attached, for example, by adhesive, to an inner face of one of the panels that form a structure of the self-expanding folding display. It will be understood that, alternatively, the binding fin 35 could extend from the first edge 41 of the second sheet body 40 with an equivalent result, or there could even be joint fins in both first and second sheet bodies.

As shown in Figs. 45 and 46, the first and second laminar bodies 30, 40 of the eleventh exemplary embodiment, once assembled with the insertion portion 34 of the first sheet body 30 inserted in the slit 43 of the second sheet body 40, are drawn one towards the another and towards a position expanded on one side by an elastic band 5 hooked at its ends in the first and second engagement configurations 36, 46, and on the opposite side by a second elastic band 66 hooked by its ends to the first and second additional hitch configurations 64, 65, while distal edges 47b, 73b of the first and second limiting appendages 47, 73 make contact with the first and second laminar bodies 30, 40, respectively, to limit the rotation and stabilize the expanding device in the expanded position. Thus, the expander device includes first and second elastic bands 5, 66 and first and second limiting appendages 47, 73 on opposite sides of the fulcrum line.

In relation to Figs. 47A, 47B and 48 a twelfth example of embodiment of the expander device of the present invention is described below, which is formed from first and second laminar bodies 30, 40 shown separately in Figs. 47A and 47B, respectively. The first laminar body 30 has first and second parallel edges 31, 32 opposite. From the first edge 31 extends a connecting flap 35 connected to the first laminar body 30 by a fold line 35a. This connecting flap 35 is intended to be attached, for example, by adhesive, to an inner face of one of the panels that form a structure of the self-expanding folding display (Fig. 49). On the second edge 32 a first engagement configuration 36 is formed. The first sheet body 30 includes a first intermediate fold line 74 disposed between the first and second edge 31, 32 and parallel thereto. The first laminar body 30 has a first insertion portion 34 that extends between the second edge 32 and a first abutment edge 33 parallel thereto, and a second insertion portion 76 that extends between the first edge 31 and a second edge of stop 77 parallel to it. At the ends of the first intermediate fold line 74 adjacent to the lateral edges of the first sheet body 30, additional first engagement configurations 78 are formed.

The second laminar body 40 shown in FIG. 47B has opposite first and second edges 41, 42 parallel, and a second intermediate fold line 75 disposed between the first and second edge 41, 42 and parallel thereto. Between said second intermediate fold line 75 and the second edge 42 there is a first slit 43 parallel to them and between the second intermediate fold line 75 and the first edge 41 there is a second slit 80 parallel to them. The first slit 43 is crossed by a limiting appendix 47 formed by die-cutting, which is connected to the second laminar body 40 by a fold line 47a adjacent to the second edge 42. The limiting appendix 47 has a distal edge 47b located between the slit 43 and the second intermediate fold line 75, and at the base of the limiting appendix 47 a second engagement configuration 46 is formed. At the ends of the second intermediate fold line 75 adjacent to the lateral edges of the Second laminar body 40 is formed by additional second hitch configurations 79.

In the operative situation shown in Fig. 48, the first and second laminar bodies 30, 40 are folded by their respective first and second intermediate fold lines 74, 75 and assembled with the first and second insertion portions 34, 76 of the first laminar body 30 inserted respectively in the first and second slits 43, 80 of the second laminar body 40, so that the first and second abutment edges 33, 77 of the first laminar body 30 establish respective first and second fulcrum lines in contact with the second laminar body 40. The first and second laminar bodies 30, 40 of the twelfth exemplary embodiment are pulled towards each other and to a position expanded on one side by an elastic band 5 hooked at its ends in the respective first and second configurations of coupling 36, 46, and on the opposite side by a second elastic band 66 hooked at its ends to the first and second configurations of additional engagement 78, 79, while the distal edge 47b of the limiting appendix 47 makes contact with the first laminar body 30 in order to limit the rotation and stabilize the expander in the expanded position. It is not essential that the first and second additional engagement configurations 78, 79 are in the respective first and second intermediate fold lines 74, 75, although it is preferable that they be close thereto.

In Figs. 49 and 50 the expander device of the twelfth embodiment described in relation to Figs. 47A, 47B and 48 applied to a self-expanding folding display with a substantially rectangular cross section. The self-expanding folding display of Figs. 49 and 50 comprises a structure 10 composed of a pair of first mutually facing first panels 11, 12, connected by their side edges by a pair of mutually facing second panels 81, 82, each of which is divided by a respective fold line average 83, 84. The mentioned first and second panels 11, 12, 81, 82 are of a sheet material, such as, for example, cardboard, corrugated cardboard, plastic, or corrugated plastic, among others. The connecting flap 35 of the first laminar body 30 is attached, for example, by adhesive, to an internal face of one of the first facing panels 11, 12 of the structure 10 of the self-expanding folding display, so that when, as a result of the tension of the elastic bands 5, 66, the expander device adopts the expanded position (Fig. 49), the first edges 31, 41 of the first and second sheet bodies 30, 40 press against the inner face of one of the first panels 11, 12 and the second edges 32, 42 of the first and second laminar bodies 30, 40 press against the inner face of the other of the first panels 11, 12, and thereby keep the first panels 11, 12 separated and the second panels 81, 82 substantially tense and flat. To fold the structure 10 of the self-expanding folding display, external pressure must be exerted on the first panels 11, 12 to overcome the tension of the elastic bands 5, 66, as shown in Fig. 50, so that the first panels 11, 12 approach each other and the second panels 81, 82 are folded by their respective middle fold lines 83, 84 so that their halves tend to align with the first panels 11, 12. It will be understood that, although in Figs. 49 and 50 the second panels 81, 82 are shown bending with the middle fold lines 83, 84 out, alternatively the second panels 81, 82 could be folded with the middle fold lines 83, 84 inward to adopt a collapsed position yet more compact

The advantage of the expanding device of the twelfth embodiment with two crossing zones, that is, with two fulcrum lines, is that it requires a relatively small space when it is in the collapsed position and yet it can acquire a large volume in the expanded position , since it behaves similar to a pantograph. One or more ways of introducing additional fulcrum lines to increase the crossing points between the first and second laminar bodies 30, 40 can easily occur to one skilled in the art without departing from the scope of the present invention.

In Fig. 51 a structure 10 of a self-expanding folding display of substantially rectangular cross-section similar to that shown in Figs. 49 and 50, but with an expander device according to a first variant of twelfth embodiment described in relation to Figs. 47A, 47B and 48. The main difference is that the lengths of the first and second laminar bodies 30, 40 from the first fulcrum line 33 to their respective second edges 32, 42, from the first fulcrum line 33 to their respective first and second intermediate fold lines 74, 75, from the second fulcrum line 77 to their respective first edges 31, 41, and from the second fulcrum line 77 to their respective second intermediate fold lines 74, 75 are substantially equal.

In Fig. 52 a structure 10 of a self-expanding folding display of substantially rectangular cross-section similar to that shown in Figs. 49 and 50, but with an expander device according to a second variant of twelfth embodiment described in relation to the Figs. 47A, 47B and 48. Here, the lengths of the first and second sheet bodies 30, 40 from the first fulcrum line 33 to their respective second edges 32, 42 and from the second fulcrum line 77 to their respective first edges 31, 41 are significantly greater than the distances from the respective first and second intermediate fold lines 74, 75 to the first and second fulcrum lines 33, 77. Furthermore, in this second variant, the first laminar body 30 incorporates a second limiting appendix 85 associated with an additional tensile element or elastic band 86 similar to the first limiting appendix 47 and associated first elastic band 5.

In Figs. 53 and 54 shows a self-expanding folding display of substantially hexagonal cross section equipped with an expander device as described above in relation to Fig. 52 and provided with a top panel 87 foldable between an open position (Fig. 53), in Ia that the upper board 87 is coplanar with the panel 11 to which it is attached, and a closed position (Fig. 54), in which said upper board 87 rests on the upper edges of one or more of the remaining panels 12, 81 , 82 and can act as a table or any other type of support surface. First, it should be noted that the structure 10 of the self-expanding folding display of substantially hexagonal cross-section shown in Figs. 53 and 54 and the structure 10 of the self-expanding folding display of substantially rectangular cross-section shown in Figs. 49 to 52 are practically the same, and it is the configuration of the appendix or limiting appendices 47, 85 that determines the degree of expansion of the expander device, and therefore the rectangular or hexagonal configuration of the structure 10 in the expanded position. Optionally, all panels 11, 12, 81, 82 of the structure 10 of the exhibitors shown in Figs. 49 to 54 may have transverse fold lines (analogous, for example, to those shown in Figs. 30 and 31) to allow folding of the display from the collapsed situation to a folded situation.

The upper board 87 is connected to the upper edge of one of the first mutually facing panels 11, 12 of the structure 10 by means of a hinge element 88 consisting of an elongated strip of sheet material, such as, for example, cardboard, cardboard corrugated, plastic, or corrugated plastic, provided with a longitudinal median fold line 89 that divides said hinge element 88 into two halves. One of said halves of the hinge element 88 is attached, for example, by adhesive, to the corresponding first panel 11 and the other half is attached to the upper board 87, so that the upper board 87 is held together with the structure 10 by the hinge element 88 and at the same time can rotate between the open and closed positions around the middle fold line 89 of the hinge element 88. Obviously, the hinge element 88 described in relation to Figs. 53 and 54 can be applied to join any board to any panel of a structure 10 of a self-expanding folding display in accordance with any example of embodiment of the present invention, or any other display, with the condition that at least the portion of the panel of the structure 10 where the hinge element 88 is attached is flat, and taking into account that the board 87 in the open position does not interfere with the folding and expansion operations of the structure 10. It will also be understood that the provision of the board 87 and the hinge element 88 is compatible with any of the examples of embodiment of the expander device of the present invention.

In relation to Figs. 55 to 57, some additional variations on the expander device and the self-expanding folding display of the present invention are described below, where the expander device comprises, for example, two first laminar bodies 30 coupled to a single second laminar body 40. Each of the first laminar bodies 30 comprise (in a manner analogous to that described above in relation to any previous embodiment example) first and second opposite edges 31, 32 and a respective insert portion 34 between a stop edge 33 and the second edge 31, while the second laminar body 40 has first and second opposite edges 41, 42 and two slits 43 formed between said first and second opposite edges 41, 42 and parallel thereto. The first laminar bodies 30 include respective first hitch configurations and the second laminar body 40 includes a pair of second hitch configurations for corresponding elastic bands 5. In the operative situation, the insertion portions 34 of the first two laminar bodies 30 they are inserted in the slits 43 of the second laminar body 40 so that the abutment edges 33 provide respective fulcrum lines for the rotation of the first two laminar bodies 30 with respect to the second laminar body 40. Either the first laminar bodies 30 or the Second laminar body 40 has at least one limiting appendix 47 formed to limit the rotation of each first laminar body 30 in a manner analogous to that described above.

The self-expanding folding display of Fig. 55 is of the type composed of two panels 11, 12 joined by its lateral edges and capable of adopting a convex outward position, analogous to that described above, for example, in relation to Figs. 30 and 31, and is associated with an expander device, the first two laminar bodies 30 of which are arranged so that their respective insertion portions 34 are located on opposite sides of the second laminar body 40. The self-expanding folding display of Fig. 56 is also of the type consisting of two panels 11, 12 capable of adopting a convex outward position, analogous to that described above in relation to Figs. 30 and 31, and is associated with an expander device having the insertion portions 34 of the first two laminar bodies 30 arranged on the same side of the second laminar body 40 and the limiting appendages 47 on the same side of the first laminar bodies 50 .

The self-expanding folding display of Fig. 57 is also of the type consisting of two panels 11, 12 capable of adopting a convex outward position, analogous to that described above in relation to Figs. 30 and 31, and is associated with an expander device having the insertion portions 34 of the first two laminar bodies 30 disposed on the same side of the second laminar body 40 and the limiting appendages 47 on opposite sides of the first laminar bodies 50. The symmetrical arrangement of the first two laminar bodies 30 that the second edges 32 thereof cooperate with vertical fold lines 90 formed in one of the panels 11 of the structure 10 of the display to provide a flat portion 11c in the panel 11 even when the display is in the expanded position, and this flat portion 11c of the display panel 11 may be useful, for example, for joining the corresponding half of a hinge element 88 analogous to that described above in relation to Figs. 53 and 54 in order to incorporate an upper board 87 to the structure 10 of the self-expanding folding display.

In Fig. 58 a folding reinforcing member 91 is shown, made of a sheet material, such as, for example, cardboard, corrugated cardboard, plastic, or corrugated plastic, among others, which is attached to a folding panel 92 which It can be part of a structure 10 according to any one of the embodiments of the self-expanding folding display of the present invention provided with at least one flat panel or a panel with a flat portion. The folding reinforcement member 91 has mutually parallel first and second opposite edges 95a, 95b and several fold lines parallel to said first and second opposite edges 95a, 95b that determine a central joint area 96 flanked by a pair of folding portions 97a , 97b, each divided in two by one of said fold lines 101. At least one tension element, such as an elastic band 98, is fastened at its first and second engagement configurations 99a, 99b of the connecting member folding reinforcement 91, located adjacent to the first and second opposite edges 95a, 95b, and passed through windows 100 formed the folding portions 97a, 97b. The folding reinforcing member 91 has a transverse fold line 93 perpendicular to the various fold lines, which crosses it from the first to the second opposite edges 95a, 95b, and the folding panel 92 also has a transverse fold line 94 that crosses it completely.

In an operative situation, the joining area 96 is joined, for example, by adhesive, to said folding panel 92 (Fig. 58) so that the transverse fold line 93 of the folding reinforcement member 91 coincides, that is, it is superimposed to the transverse fold line 94 of the folding panel 92. The tension of said elastic band 98 pulls the first and second edges 95a, 95b of the folding reinforcement member 91 towards each other, so that the folding reinforcement member 91 it adopts a three-dimensional position (shown in Figs. 58 and 59) in which the folding portions 97a, 97b are folded by their central fold lines 101 forming rigid ridges that prevent the assembly from being folded by the transverse fold lines overlays 93, 94 of the folding reinforcement member 91 and of the folding panel 92, respectively. In this position, for example, a part of the folding panel 92 above the transverse fold line 94 would be held up or the entire folding panel 92 would remain rigid supported by the expanded folding reinforcing member 91. To bend the folding panel 92 it is first necessary to press the ridges formed by the folding portions 97a, 97b of the folding reinforcement member 91 until the tension of the elastic band 98 is overcome to arrange the folding reinforcement member 91 in a collapsed position (Fig. 60), substantially flat, in which the folding reinforcement member 91 offers virtually no resistance to bending the assembly by the transverse fold lines 93, 94 superimposed.

Optionally, the folding reinforcing member 91 may incorporate limiting appendages 102 (Fig. 59), similar to the limiting appendix 47 described above in relation to the exemplary embodiments of the expander device, to limit the degree of folding of the folding portions 97a , 97b in the expanded position.

One skilled in the art will be able to make modifications and variations from the examples of embodiment shown and described without departing from the scope of the present invention as defined in the appended claims.

Claims

1.- Expanding device for self-expanding folding display, said folding display being self-expanding of the type comprising a structure (10) formed from at least two panels (11, 12) facing and joined by their side edges, and in a situation Collapsed adopts a flat configuration, and in a service position adopts a three-dimensional configuration capable of standing upright, and said expander device of the type comprising at least one laminar body attached to at least one of said panels (11, 12), being said laminar body capable of adopting a flat position together with the panels (11, 12) in said collapsed situation, and a tensile element arranged to rotate, bend or bend the laminar body between the panels (11, 12) and thereby cause The expansion of said display structure (10), characterized in that it comprises: a first laminar body (30) having first and second edges (31, 32), opposite, and at least u an insertion portion (34) extending between at least one abutment edge (33) located between said first and second edges (31, 32) and one of said first and second edges (31, 32); and a second laminar body (40) having opposite first and second edges (41, 42), and at least one slit (43) located in an area between said first and second edges (41, 42); wherein said insertion portion (34) of the first sheet body (30) is sized to be inserted into said slit (43) of the second sheet body (40) until said abutment edge (33) of the first sheet body (30) causes contact with the second laminar body (40); and where the abutment edge (33) and the slit (43) define a fulcrum line along which the first and second laminar bodies (30, 40) can rotate with respect to each other between a flat position, in Ia that the first and second laminar bodies (30, 40) are superimposed, and an expanded position, in which the first and second laminar bodies (30, 40) are crossed. 2. Device, according to claim 1, characterized in that at least one of the first and second edges (31, 32; 41, 42) of the first and second laminar bodies (30, 40) extends at least one joint flap (35) for joining an internal face of one of the panels (11, 12) of the structure (10), where said joint flap (35) is connected to the corresponding first or second laminar body (30, 40 ) by a fold line (35a). 3. Device, according to claim 1 or 2, characterized in that the first laminar body (30) has a first hook configuration (36) and the second laminar body (40) has a second hook configuration (46), and said traction element comprises an elastic band (5) hooked at its ends in said first and second engagement configurations (36, 46) to pull the first and second laminar bodies (30, 40) towards the expanded position. 4. Device according to claim 3, characterized in that at least one of the first and second laminar bodies (30, 40) comprises a limiting appendix (47) capable of making contact with the other of the first and second laminar bodies (30, 40) to limit the rotation in the expanded position. 5. Device according to claim 4, characterized in that the second laminar body (40) has a cut that defines said limiting appendix (47) and the second hook configuration (46) in the limiting appendix (47), wherein a proximal end of the limiting appendix (47) is connected to the first laminar body by a fold line (47a). 6. Device according to claim 5, characterized in that the limiting appendix (47) has a distal edge (47b) wider than said first engagement configuration (36) of the first sheet body (30), and said elastic band (5) cooperates with said distal edge (47b) of the limiting appendix (47) to establish the limit position of the limiting appendix (47) corresponding to the expanded position. 7. Device, according to claim 5 or 6, characterized in that said fold line (47a) connecting the limiting appendix (47) to the second laminar body (40) is located between the slit (43) and that of the first and second edges (41, 42) of the second sheet body (40) that is adjacent to the insertion portion (34) of the first sheet body (30) in the flat position. 8. Device, according to claim 7, characterized in that the limiting appendix (47) crosses the slit (43) and the slit (43) is divided into two portions on either side and side of the limiting appendix (47). Device according to any one of the preceding claims, characterized in that the second laminar body (40) has a second longitudinal fold line (49) extending from one to the other of its first and second edges (41, 42), opposite, and along the limiting appendix (47), said slit (43) is composed of two slit portions forming an angle to each other side and side of said second longitudinal fold line (49) and said line of fold (47a) of the second sheet body (40) is composed of two portions of fold line forming an angle to each other side and side of said second fold line longitudinal (49), and the first laminar body (30) has a first longitudinal fold line (39) extending from one to the other of its first and second opposite edges (31, 32), centered with the first hitch configuration (36), and said fold line (35a) of the first sheet body (30) is composed of two portions of fold line forming an angle to each other side and side of said first longitudinal fold line (39). 10. Device according to any one of claims 1 to 8, characterized in that the first sheet body (30) is formed by cutting lines in a first sheet (3) and is connected to said first sheet (3) by a fold line (3a) along one of the first and second opposite edges (31, 32) of the first sheet body (30), and the second sheet body (40) is formed by cutting lines in a second sheet (4) and is connected to said second sheet (4) by a fold line (4a) along one of the first and second opposite edges (41, 42) of the second sheet body (40), being said first and second sheets (3, 4) configured to be attached to internal faces of two panels (11, 12) facing said structure (10). 11. Device according to any one of claims 1 to 8, characterized in that at least one of the first and second edges (31, 32; 41, 42) of each of the first and second laminar bodies (30, 40) The expander device is a curved-convex edge. 12. Device, according to any one of the preceding claims, characterized in that the insertion portion (34) of the first sheet body (30) is located between two portions of said abutment edge (33) and comprises retention configurations (38) adjacent to said portions of the abutment edge (33). 13. Device, according to claim 4, characterized in that the first and second laminar bodies (30, 40) comprise respective first and second additional engagement configurations (64, 65) and a second tension element in the form of a second elastic band (66) is hooked at its ends in said first and second additional engagement configurations (64, 65) to pull the first and second sheet bodies (30, 40) into the expanded position, said first and second being elastic bands (5, 66) arranged on opposite sides of said fulcrum line. 14. Device according to claim 13, characterized in that each of the first and second laminar bodies (30, 40) comprises a respective limiting appendix (47, 73) capable of making contact with the other of the first and second laminar bodies (30, 40) to limit rotation in the expanded position, said limiting appendages (47, 73) being arranged on opposite sides of said fulcrum line. 15. Device according to claim 4, characterized in that the first laminar body (30) further comprises a first intermediate fold line (74) disposed between the first and second edges (31, 32) and parallel thereto, and a second insertion portion (76) extending between at least a second abutment edge (77), located between said intermediate fold line (74) and the first edge (31), and the first edge (31), and the second sheet body (40) further comprises a second intermediate fold line (75) disposed between the first and second edge (41, 42) and parallel thereto, and a second slit (80) located in an area between said second line intermediate fold (75) and the first edge (41), wherein said second insertion portion (76) of the first sheet body (30) is sized to be inserted into said second slit (80) of the second sheet body (40) up to that said second abutment edge (77) of the first laminate body r (30) makes contact with the second laminar body (40), and where the second abutment edge (77) and the second slit (80) define a second fulcrum line. 16. Device according to claim 15, characterized in that the first sheet body (30) comprises at least a first additional engagement configuration (78) in or near the first intermediate fold line (74), the second body Laminar (40) comprises at least a second additional engagement configuration (79) on or near the second intermediate fold line (75), and a second elastic band (66) is hooked at its ends to the first and second configurations of additional hitch (78, 79). 17. Device, according to claim 1, characterized in that the second laminar body (40) comprises at least two of said slits (43) formed between said first and second edges (41, 42) and parallel thereto, and at least two of said first sheet bodies (30) are arranged with their respective insertion portions (34) inserted into said slits (43) of the second sheet body (40), where each of the first two sheet bodies (30) includes at least one respective first hitch configuration, the second laminar body (40) includes at least a pair of second hitch configurations, and a corresponding pair of elastic bands (5) are hooked by their ends in said first and second hitch configurations to pull the first and second laminar bodies (30, 40) towards the expanded position. 18.- Self-expanding folding display, of the type comprising at least one structure (10) formed from at least two panels (11, 12) facing and joining by its lateral edges, and that in a collapsed situation they adopt a flat configuration, and in a service position they adopt a three-dimensional configuration capable of being held upright, and at least one expander device arranged between said panels (11, 12) and comprising the less a laminar body attached to at least one of the panels (11, 12), said laminar body being able to adopt a flat position together with the panels (11, 12) in said collapsed situation, and a traction element arranged to rotate , bending or bending the laminar body between the panels (11, 12) and thereby causing the expansion of said structure (10), characterized in that said expander device comprises: a first laminar body (30) having first and second edges ( 31, 32), opposite, and at least one insertion portion (34) extending between at least one abutment edge (33) located between said first and second edges (31, 32) and one of said first and second edges (31 , 32); and a second laminar body (40) having opposite first and second edges (41, 42), and at least one slit (43) located in an area between said first and second edges (41, 42); wherein said insertion portion (34) of the first sheet body (30) is sized to be inserted into said slit (43) of the second sheet body (40) until said abutment edge (33) of the first sheet body (30) causes contact with the second laminar body (40); and where the slit (43) and the abutment edge (33) define a fulcrum line along which the first and second laminar bodies (30, 40) can rotate with respect to each other between a flat position, in Ia that the first and second laminar bodies (30, 40) are superimposed, and an expanded position, in which the first and second laminar bodies (30, 40) are crossed. 19. Exhibitor, according to claim 18, characterized in that from at least one of said first and second edges (31, 32; 41, 42) of the first and second laminar bodies (30, 40) of the expander device extends at least one connecting flap (35) for joining an internal face of one of the panels (11, 12) of the structure (10), where said connecting flap (35) is connected to the corresponding first or second laminar body ( 30, 40) along a fold line (35a). 20.- Display, according to claim 19, characterized in that said connecting flap (35) is attached to the corresponding panel (11, 12) of the structure (10) in a position such that said fulcrum line is substantially parallel to the mentioned side edges of the panels (11, 12). 21. Exhibitor, according to claim 19, characterized in that said connecting fin (35) is attached to the corresponding panel (11, 12) of the structure (10) in a position such that said fulcrum line is substantially perpendicular to the mentioned side edges of the panels (11, 12). 22.- Exhibitor, according to claim 21, characterized in that said structure (10) comprises two opposite panels (11, 12) of convex arched configuration, and the first and second edges (31, 32; 41, 42) of the First and second laminar bodies (30, 40) of the expander device are curved-convex according to said convex arcuate configuration of the two opposite panels (11, 12) of the structure (10). 23.- Display, according to claim 21, characterized in that said structure (10) comprises two opposite panels (11, 12) of flat configuration, and the first and second edges (31, 32; 41, 42) of the first and second laminar bodies (30, 40) of the expander device are rectilinear according to said flat configuration of the two opposite panels (11, 12) of the structure (10). 24. Exhibitor, according to claim 21, characterized in that said structure (10) comprises two opposing panels (11, 12), one of which is of convex arched configuration and the other is flat, and one of the first and second edges (31, 32; 41, 42) of the first and second laminar bodies (30, 40) of the expander device are curved-convex according to said convex arcuate configuration of one of the opposing panels (11, 12) of the exhibitor and the others of the first and second edges (21, 32; 41, 42) of the first and second laminar bodies (30, 40) of the expander device are rectilinear according to said flat configuration of the other of the panels (11, 12 ) Opposites of the structure (10). 25.- Exhibitor, according to claim 23 or 24, characterized in that said joining fin (35) is formed on a rectilinear edge of the first and second edges (31, 32; 41, 42) of the first and second bodies laminar (30, 40) of the expander device, wherein said rectilinear edge has a length that covers all or a substantial part of the width of one of the flat panels (11, 12) of the structure (10) and the joint flap ( 35) is attached to the internal surface of said flat panel (11, 12) of the structure (10). 26.- Exhibitor, according to claim 22, 23 or 24, characterized in that at least one of the laminar bodies (30, 40) of the expander device comprises at least one extension portion (37) extending from one of its opposite first and second edges (31, 32; 41, 42), and, in the expanded situation, said extension portion (37) is passed through a slit (67) formed in one of the panels (11, 12) of the structure (10) adjacent to the base thereof to make contact with the ground. 27.- Exhibitor, according to claim 23, 24 or 25, characterized in that it comprises at least two structures (10a, 10b), each formed by at least two opposite panels (11a, 12a; 11b, 12b), at least one (11a, 11b) of which is a flat panel, and an additional panel (15) having a first side edge (15a) attached to a side edge of the flat panel (10a) of one of said two structures (10a) and a second lateral edge (15b) attached to a lateral edge of the flat panel (11b) of the other of said two structures (10b), the two structures (10a, 10b) being configured to be arranged with their flat panels (11a, 11b) aligned with the additional panel (15) to jointly form a mural. 28.- Exhibitor, according to any one of claims 18 to 27, characterized in that said panels (11, 12), which are at least two, of the structure (10), or of each structure (10a, 10b) are formed from a single piece of sheet material (20), where the panels (11, 12) are arranged in parallel and connected to each other by longitudinal fold lines (17) that delimit said side edges of the panels ( 11, 12), and where from a side edge of one of the end panels extends at least one connecting flap (16) connected to said piece of sheet material (20) by a longitudinal fold line (16a) and arranged for be attached to one side edge of the other end panels. 29.- Exhibitor, according to claim 28, characterized in that said piece of sheet material (20) comprises transverse fold lines (18) perpendicular to said longitudinal fold lines (17) through all the panels (11, 12), where said transverse fold lines (18) allow a folding of the structure (10) from said collapsed situation to a folded situation. 30.- Exhibitor, according to claim 29, characterized in that each of the transverse fold lines (18) is composed of at least three adjacent transverse fold lines, said joining fin (16) is interrupted in the areas where the transverse fold lines (18) join the side edge of the corresponding end panel, and the longitudinal fold lines (17) are aligned with longitudinal cuts (19) in crossing areas with the transverse fold lines (18) . 31.- Exhibitor, according to claim 18, characterized in that it comprises a reinforcing member (52, 91) made of a sheet material, with a joint area (52a, 96) attached to a face of an auxiliary panel (50 , 92) associated with, or forming part of the structure (10), said reinforcement member (52, 91) being provided with several fold lines (52b, 101) arranged so that said reinforcing member (52, 91) can adopt a collapsed situation, in which the reinforcing member (52, 91) is flat, and an expanded situation , in which the reinforcing member (52, 91) is zigzag folded by said fold lines (52b, 101) adopting a substantially rigid three-dimensional configuration, at least one elastic element (53, 98) being arranged to contract said member reinforcement (52, 91) from said collapsed situation to said expanded situation. 32.- Exhibitor, according to claim 31, characterized in that said auxiliary panel (92) is foldable by a transverse fold line (94), and the reinforcement member (91) has a substantially transverse fold line (93) perpendicular to the fold lines (101) of the reinforcement member (91) and superimposed on said transverse fold line (94) of the auxiliary panel (92), such that the auxiliary panel (92) and the reinforcement member (91 ) can only be folded together by their transverse fold lines (93, 94) superimposed if the folding reinforcement member (91) is forced into said collapsed situation against the tension of said elastic element (98). 33.- Exhibitor, according to claim 18, characterized in that it comprises an upper board (87) connected to the structure (10) by means of a hinge element (88) configured as a strip of sheet material provided with a line of middle fold (89) dividing said hinge element (88) into two halves, one of said halves of the hinge element (88) being attached to an upper edge of at least one flat portion one of the panels (11, 12) of the structure (10) and the other half attached to the upper board (87), so that the hinge element (88) keeps the upper board (87) attached to the structure (10) and allows the upper board (87) rotate between open and closed positions around said middle fold line (89).