ES2310135B1 - EXPANSOR DEVICE FOR SELF-EXPANDABLE FOLDING EXHIBITOR AND SELF-EXPANDABLE FOLDING EXHIBITOR. - Google Patents

Abstract

Expander device for folding display self-expanding and folding self-expanding display.

The exhibitor comprises a structure (10) folding with two panels (11, 12) facing and joined by their side edges. Between the panels there is an expander device that it comprises a first laminar body (30) with first and second ones opposite edges (31, 32) and at least one insert portion (34) extending between at least one intermediate stop edge (33) and one of said first and second edges, and a second laminar body (40) with opposite first and second edges (41, 42) and a slit (43) between said first and second edges. The portion of insert is inserted into the slit and the slit (43) and the edge butt (33) define a fulcrum line along which first and second laminar bodies (30, 40) can rotate one with respect to the other towards an expanded position in cooperation with an elastic band (5).

Description

Expander device for folding display self-expanding and folding self-expanding display.

Technical field

The present invention concerns a device expander made from two laminar bodies, of one material such as cardboard, corrugated cardboard, plastic, and corrugated plastic, among others, applied to the expansion of a folding display self-expanding composed of two or more facing and joined panels by their 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 standing tall.

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

Background of the invention

WO international patent application 2006/067252 A1 unveils a self-expanding collapsible display and a pushing element for its expansion. This exhibitor comprises a structure formed by two or more facing panels and joined by their respective lateral edges by bands elastic hooks on prominent panel fins. The structure can be arranged in a collapsed situation, in the which adopts a flat configuration, and from that situation collapsed, and in cooperation with a means of expansion including one or more push elements actuated by one or more elements of elastic traction, the display can automatically switch to a service position in which the structure adopts a three-dimensional configuration capable of standing tall. In addition, to from said collapsed situation, the exhibitor can be folded by transverse fold lines to a folded situation. Each pushing element of said expansion means is in the shape of a laminar body attached to one of the panels of the structure and capable of adopting a flat position together with the structure panels in said collapsed situation, and the element traction 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 body laminate between the panels of the structure and thereby cause the Exhibitor expansion.

This self-expanding collapsible display and thrust element of the international patent application WO 2006/067252 A1 is fully operational. However, it is susceptible of several improvements in relation 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 of the same.

Exhibition of the invention

According to a first aspect, this invention provides an expander device for a folding display self-expanding The self-expanding folding display is of the type comprising 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 standing tall The expander device is of the type that it comprises at least one laminar body attached to at least one of said panels, said laminar body being able to adopt a position flat together with the panels in said collapsed situation, and a traction element arranged to rotate, bend or bend the laminar body between the panels, and thereby cause expansion of the structure of the exhibitor. The expander device of the The present invention is characterized in that it comprises two bodies laminar, namely: A first laminar body that has a first and second, opposite edges, and at least one insertion portion that extends between at least one leading edge located between said first and second edges and one of said first and second edges; Y a second laminar body that has first and second edges, opposite, and at least one slit located in an area between said First and second edges. The mentioned insertion portion of the first sheet body is sized to be inserted in said slit of the second laminar body until said abutment edge of the First laminar body makes contact with the second laminar body. In this position, the leading edge of the first laminar body and the slit of the second laminar body define a fulcrum line at along which the first and second laminar bodies can rotate  with respect to each other between a flat position, in which the first and second laminar bodies are superimposed, and a expanded position, in which the first and second bodies Layers are crossed.

The first and second laminar bodies are of a relatively rigid sheet material, such as cardboard, corrugated cardboard, plastic, or corrugated plastic, among others, although corrugated cardboard is generally preferred. When cardboard is used or corrugated plastic, the channels provided by the corrugations are arranged in a direction perpendicular to the mentioned line fulcrum, that is, extending between the first and second edges of each laminar body.

For joining the expander device to the exhibitor structure, from at least one of the first and second edges of the first and second laminar bodies are extends at least one binding fin configured to be joined, by  example by adhesive, to an inner face of one of the panels of the structure. Said binding fin is connected to the corresponding first or second laminar body along a line of fold 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 face internal of one of the panels of the structure of the exhibitor during the exhibitor's expansion and collapse processes. Depending on the number of panels and / or the configuration of the Exhibitor structure, a connecting flap may be provided in a pushing edge of each laminar body of the expander device for joining two different panels of the exhibitor structure, or even the four thrust edges of the two laminar bodies may be associated with respective binding fins for binding to Four different panels of the exhibitor structure.

Preferably, the tensile element of the expander device comprises a single elastic band engaged by one of its ends in a first hitch configuration formed in the first laminar body and a second end hooked in a second hitch configuration formed in the second laminar body. Thus, the mentioned elastic band is tensioned when the expander device is arranged in the flat position, and is ready to pull the first and second laminar bodies towards the expanded position.

In order to limit the rotation of the first and second laminar bodies so that in the extended position they remain approximately at right angles to each other, or forming any other angle deemed convenient, at least one of the laminar bodies comprises a limiting appendix capable of make contact with the other laminar bodies when the expander device is in the expanded position. Advantageously, the same laminar body that incorporates the slit also has a court that defines the aforementioned appendix limiter and also the second hitch configuration in the limiter appendix, with a proximal end (that is, closer to the laminar body) of the limiting appendix connected to the first laminar body by a line of fold that facilitates the movements of the limiting appendix in relationship with the laminar body. The elastic element is hooked in the first and second hitch configurations so that the limiting appendix is linked to the elastic element and is lifts along with it as the expander device move from the flat position to the expanded position. Further, the limiting appendix has a distal edge (that is, farther away of the laminar body to which it is attached) wider than the first hitch 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 appendix limiter preventing further movement thereof during the evolution of the expander device from the flat position to the expanded position to set the limit position of the appendix limiter corresponding to the expanded position.

In this expanded position, the device expander presents, with only two crossed laminar bodies, a three-dimensional high volume configuration, with up to four edges, that is, the first and second edges of the first body laminar and the first and second edges of the second laminar body, separated to the maximum and willing 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 arms of lever of substantially the same length, one between the first edge and fulcrum line and the other between the second edge and the fulcrum line

Thanks to its construction, the device Expander of the present invention provides a number of advantages with respect to the thrust elements of the prior art, between They the following.

The thrust forces are divided into four substantially symmetric points, which provides a more balanced expansion of the structure of the exhibitor.

The sliding path they make some of the thrust edges of the expander device on the internal surfaces of the display structure panels during the exhibitor's expansion and collapse processes they are relatively small, resulting in a smooth glide both collapsing and expanding the display. Optionally, the laminar bodies may have a few indented lines parallel and close to the thrust edges to produce a slight curvature of them when they push on the display panels and thereby produce a smoothing effect of the slip.

Thanks to the cross arrangement of the bodies The same volume of expansion of the display with lever arms (between the first and second pushing edges of the laminar bodies and the fulcrum line) relatively short, resulting 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 it comprises at least one 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 standing tall, and at least one expander device arranged between said panels. The self-expanding folding display of the present invention is characterized in that said device expander has the essential characteristics of the device expander of the first aspect of the present invention described more above.

The two or more panels that make up the structure of the display 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 some longitudinal fold lines delimiting those mentioned side edges of the panels, except side edges ends of the end panels. From an extreme side edge of one of said end panels extends a binding flap connected to said piece of sheet material by a fold line longitudinal that facilitates its bending. This binding fin is arranged to be attached, for example by adhesive, to the edge extreme side of the other end panels.

The mentioned piece of sheet material it also includes transverse fold lines perpendicular to said longitudinal fold lines and that They run through all the panels. When the exhibitor is assembled, these transverse fold lines allow a folding the structure from the aforementioned situation collapsed to a folded situation. In addition, to facilitate the folding of the exhibitor and avoid tearing at the edges, each of the lines of Transverse fold is composed of at least three, and preferably at least four, transverse fold lines adjacent, the aforementioned binding fin is interrupted in the zones where the transverse fold lines join the side edge end of the corresponding end panel, and the fold lines longitudinal lines are aligned with longitudinal cuts in crossing areas with transverse fold lines.

With this construction based on a single piece of sheet material, manufacturing costs, handling and Exhibitor structure storage are significantly smaller compared to others prior art displays built from panels separated joined by their lateral edges by elastic bands hooked on fins folded inwards. Also, since usually the external surfaces of the display panels carry printed graphic information, the exhibitor of this invention allows printing of all panels by a single printing operation of the piece of material laminate instead of a print operation for each panel individual, as with the prior art exhibitors, which leads to significant savings in printing costs and manipulation.

According to an embodiment example, the Exhibitor structure consists of two facing panels and joined by lateral edges, and in the expanded situation adopts a convex configuration of elliptical or ogival cross section, which in an extreme case it can 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 that in the expanded situation they adopt a prismatic configuration of flat faces, whose section transverse is preferably a polygon with an even number of sides, for example a rectangle, a square or a regular hexagon or irregular, where at least two of the larger panels They are facing each other. According to another embodiment, the Exhibitor structure comprises two or more panels, including two Opposite larger panels, one of which is of convex arched configuration and the other is flat when the exhibitor adopts the expanded situation.

With most examples of realization of the display structure described above, the expander device it can be attached to at least one of the panels in such a position that said fulcrum line is substantially parallel to the mentioned side edges of the panels. However, it is also possible to join the expander device to the structure in a position such that said fulcrum line is substantially perpendicular to the mentioned side edges of the panels. This horizontal layout of the fulcrum line is adequate when the structure comprises, for example, two opposite panels of convex arched configuration, in which case the first and second edges of the first and second laminar bodies of the expander device are curved-convex, so they help to form and maintain said convex arched configuration of the two opposite panels of the structure. When the structure It comprises two larger, opposite, configuration panels flat, 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 keep said flat configuration of the two opposite panels of the structure. The horizontal layout of the fulcrum line is also suitable when the structure comprises two larger panels opposite sizes, one of which is arched configuration convex 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 configuration convex arc of one of the exhibitor's opposite panels and the second edges of the first and second laminar 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 position expanded present a flat major face and in which the line of fulcrum of the expander device is arranged in position horizontal, the binding fin is formed in one of those mentioned rectilinear edges of one of the laminar bodies of the element expander In addition, the laminar body involved has a zone widened so that said rectilinear edge has a length covering all or a substantial part of the width of the panel flat, or one of the flat panels, of the structure. Fin union is attached to the inner surface of this flat panel of the structure. With this provision, 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 configuration flat panel display panel.

According to another embodiment particular of the exhibitor of the present invention, the exhibitor it 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 larger panels opposites, and at least one of the two largest panels is a flat panel in the expanded situation. The mentioned panel additional has a first side edge attached to a side edge of the  flat panel of one of said two structures and a second edge side attached to one side edge of the flat panel of the other of These two structures. Both structures can be arranged with their respective flat panels mutually aligned and aligned to in turn with the additional panel to jointly form a mural of large size, suitable, for example, as a print support Large digital Obviously, following this example, you they could build exhibitors to form larger murals starting from a number n of structures and a number n-1 of additional panels, with each panel additional extending between each of the structures.

Additionally, the exhibitor includes one or more shelves, each of which comprises a shelf panel, collapsible, a collapsible reinforcement member located below the shelf panel, and an elastic element to contract the member of  reinforcement in the expanded situation.

Brief description of the drawings

The above and other features and advantages will be more fully understood from the following detailed description of some embodiments with reference to the attached drawings, in which:

Figs. 1A and 1B are plan views of about first and second laminar bodies, respectively, that form part of an expander device for folding display self-expanding according to 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 1B assembled and driven by an elastic band
ethics;

Figs. 3 and 4 are plan views of the expander device of the first embodiment applied to a self-expanding folding display with an ogival cross section and a self-expanding folding cross-section display square, respectively;

Figs. 5A and 5B are plan views of about first and second laminar bodies, respectively, that form part of an expander device for folding display self-expanding according to 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 to 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 device expander of the second embodiment applied to an exhibitor self-expanding folding comprising two opposite panels of convex arched configuration that determine a section ogival transverse;

Figs. 8A and 8B are plan views of about first and second laminar bodies, respectively, that form part of an expander device for folding display self-expanding according to a third embodiment of the first aspect of the present invention;

Figs. 9 and 10 are views in plan and in perspective, respectively, of the third expander device embodiment example applied to a folding display self-expanding comprising two opposite panels, one of which it is of convex arched configuration and the other is flat;

Fig. 11 is a perspective view of a expander device formed from first and second laminar 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 a expander device according to a variant of the fourth example of realization;

Fig. 13 is a plan view of the expander device corresponding to the room variant exemplary embodiment of Fig. 12 applied to an exhibitor self-expanding folding hexagonal cross section;

Figs. 14A and 14B are plan views of some first and second laminar bodies, respectively, that form part of an expander device for folding display self-expanding according to a fifth example of realization of first aspect of the present invention;

Fig. 15 is a perspective view of the fifth embodiment of the expander device formed to from the first and second sheet 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 folding self-expanding sectional display ogival transverse;

Figs. 17 and 18 are views in plan and in perspective, respectively, of a variant of the device expander of the fifth embodiment applied to an exhibitor folding cylindrical self-expanding, that is, cross-sectional circular;

Figs. 19A and 19B are plan views of some first and second laminar bodies, respectively, that form part of an expander device for folding display self-expanding according to a sixth example of realization of first aspect of the present invention;

Fig. 20 is a perspective view of the expander device of the sixth embodiment example 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 hexagonal cross section display irregular, with two large flat panels facing each other;

Figs. 22A and 22B are plan views of some first and second laminar bodies, respectively, that form part of an expander device for folding display self-expanding according to a seventh example of realization of first aspect of the present invention;

Fig. 23 is a perspective view of the expander device of the seventh embodiment example formed to from the first and second sheet bodies of Figs. 22A and 22B assembled and pulled by an elastic band;

Figs. 24A and 24B are plan views of about first and second laminar bodies, respectively, that form part of an expander device for folding display self-expanding according to an eighth example of realization of first aspect of the present invention;

Fig. 25 is a perspective view of the expander device of the eighth embodiment example 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 some first and second laminar bodies, respectively, that form part of an expander device for folding display self-expanding according to a ninth example of realization of 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 some first and second laminar bodies, respectively, that form part of an expander device for folding display self-expanding according to a tenth example of realization of first aspect of the present invention;

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

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

Fig. 30A is an enlarged view of detail A of Fig. 30;

Fig. 30B is an enlarged view of detail B of Fig. 30;

Fig. 31 is a perspective view of the exhibitor of the first embodiment with indication of the 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 according to a second example of embodiment of the second aspect of the present invention, including an expander device that provides a foot of support;

Fig. 34 is a perspective view of the expander device that provides a support foot and that forms part of the display of the second embodiment of Fig. 33;

Fig. 35 is a perspective view of a self-expanding folding display according to a third example of embodiment of the second aspect of the present invention, configured to provide a large mural;

Figs. 36A, 36B and 36C are seen in perspective that show the exhibitor of the third example of realization in different positions corresponding to different collapsing and folding phases;

Figs. 37, 38, 39 and 40 are seen in perspective that show the construction and operation of folding a shelf according to an embodiment adapted to be installed in a self-expanding folding display of the present invention; Y

Figs. 41, 42 and 43 are perspective views which show the construction and operation of folding a shelf according to another embodiment adapted for be installed in a self-expanding folding display of this  invention.

Detailed description of some embodiments

Referring firstly to Figs. 1A, 1B and 2, the expander device for folding display self-expanding includes, according to a first example of embodiment of the first aspect of the present invention, a first laminar body 30, shown separately in Fig. 1A, and a second laminar body 40, shown separately in Fig. 1B. These first and second laminar bodies 30, 40, of such material such as cardboard, corrugated cardboard, plastic, and corrugated plastic, between others. The first laminar body 30 has a first and second opposite edges 31, 32, and a stop edge 33 located between said first and second edges 31, 32 and substantially parallel to the same. An insert portion 34 extends between said edge of stop 33 and the second edge 32. The mentioned insertion portion 34 of the first laminar body 30 is located between two portions of said abutment edge 33 and comprises configurations of retention 38 adjacent to said portions of the abutment edge 33. The second laminar body 40 has first and second edges 41, 42, opposite, and a slit 43 located in a middle zone between said first and second edges 41, 42. The said portion of insert 34 of the first laminar body 30 is sized to be inserted into 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 the Fig. 2. In this position, the stop edge 33 and the slit 43 define a fulcrum line along which the first and second laminar bodies 30, 40 can rotate the one relative to the another between a flat position (not shown), in which the first and second laminar bodies 30, 40 are superimposed, and a position expanded (Fig. 2), in which the first and second bodies Laminar 30, 40 are crossed. In the aforementioned flat position, the first edge 31 of the first laminar body 30 is substantially adjacent to the first edge 41 of the second body laminar 40 and the second edge 32 of the first laminar body 30 is substantially adjacent to the second edge 42 of the second body laminar 40. The aforementioned retention configurations 38 formed at the base of insertion portion 34 of the first body laminar 30 contribute to keep insertion portion 34 in position within the slit 43 of the second laminar body 40.

From the second edge 32 of the first body laminar 30 extends at least one connecting flap 35 provided for be attached, for example, by adhesive, to an inner face of one of panels 11, 12 that make up a structure 10 of the exhibitor self-expanding folding, as described below. This binding flap 35 is connected to the corresponding first body laminate 30 along a fold line 35a. It will be understood that, alternatively, the binding fin 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 in one and / or another of the first and second laminar bodies, as you will see more ahead.

The first laminar body 30 has a first hitch configuration 36 formed, for example, by die-cutting in it and the second laminar body 40 has a second hitch configuration 46 also formed, for example, by die cut As shown in Fig. 2, the device expander of this first embodiment includes an element of traction materialized by an elastic band 5 hooked by its ends in said first and second configurations of hook 36, 46, so that the pulling element 5 pulls the first and second laminar bodies 30, 40 the one 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 cut, able to make contact with the other of the first and second laminar bodies 30, 40 to limit rotation formed by them when they are attracted to the element of traction 5 in the extended 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 configuration of hitch 46 formed in the limiting appendix 47 near the base of the same. 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 configuration of hook 36 of the first laminar body 30, whereby the band elastic 5 hooked on the first hitch configuration 36 cooperates with said distal edge 47b of the limiting appendix 47 acting as a stop to set the limit position of the limiting appendix 47 corresponding to the expanded position. In this first embodiment, the fold line 47a that connect 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, is 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.

The expander device is shown in Fig. 3 in accordance with the first embodiment of the present invention applied to a self-expanding folding display that it comprises 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 its side edges 16, 17, which, in a collapsed situation adopts a flat configuration, and in a service position adopts a three-dimensional configuration capable of standing tall. In addition, the panels 11, 12 of the structure 10 of the display include lines of cross fold 18 (see, for example, Figs. 30 and 31) perpendicular to its lateral edges 16, 17 to facilitate folding of the exhibitor from said situation collapsed to a folded situation (Fig. 32). The expander device is arranged within the structure 10 of the exhibitor and is able to adopt its flat position together with panels 11, 12 in said situation collapsed When the expander device, due to the effect of the element of traction 5, adopts the expanded position, the first and second edges 31, 32; 41, 42 of the first and second bodies Layers 30, 40 that compose it press the two panels 11, 12 of the structure 10 of the exhibitor from within so that the exhibitor adopts a three-dimensional section configuration transverse oval or ogival. It will be noted that the device expander is attached to the exhibitor in such a way that the mentioned fulcrum line of the expander device is arranged in a direction parallel to the side edges 16, 17 of the panels 11, 12 forming the structure 10 of the exhibitor. Preferably, the display includes several expander devices, for example, one for each of the sections in which the fold lines cross-sections 18 divide panels 11, 12.

In the first embodiment illustrated in Fig. 2, the expander device has connecting fins 35 in the second edges 32, 42 of both first and second laminar bodies 30, 40 for joining both panels 11, 12 of 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 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 binding fin 35 attached to panels 11, 12 of the display they slide on their inner faces during the folding and unfolding operations of structure 10 of the exhibitor.

The expander device is shown in Fig. 4 in accordance with the first embodiment of the present invention applied to a self-expanding folding display that it comprises a structure 10 formed from four panels, of a material such as cardboard, corrugated cardboard, plastic, and plastic wavy, joined to each other by their side edges and facing two to two, that is, with two of the panels 11, 12 mutually facing each other and two of panels 54, 55 mutually faced. The display in Fig. 4 can adopt, in a collapsed situation, a flat configuration in which the panels 11, 12 are superimposed on panels 54, 55, respectively, and, in a service position, a three-dimensional configuration of substantially square cross section capable of having upright Here, the expander device is arranged within the display panels 11, 12, 54, 55, with the fulcrum line of the expander device arranged in a direction parallel to the side edges of panels 11, 12, 54, 55 of structure 10 of the exhibitor. Thus, each of the first and second edges 31, 32; 41, 42 of the first and second laminar bodies 30, 40 presses from within one of the four panels 11, 12, 54, 55 of the Exhibitor structure 10. There is no problem here that all 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 and unfolding operations.

In Figs. 5A, 5B, and 6 a second is shown exemplary embodiment of the expander device, which only differs from the first embodiment in that, in the first laminar body 30, the first hitch configuration 36 is formed on the first edge 31 and, on 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 of the itself 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 parts side and side of the limiting appendix 47. Thus, the appendix limiter 47 may be longer and the first and second hitch configurations 36, 46 are further apart from each other and the elastic band 5, which is longer, pulls the first and second laminar bodies 30, 40 from the nearest areas to their respective edges 31, 42.

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

In relation to Figs. 8A, 8B, 9 and 10 se describe below an expander device according to a third embodiment of the present invention provided to be installed in a self-expanding folding display whose structure 10 comprises two opposite panels 11, 12, one of the which, in the expanded position, is arched configuration convex while the other is flat, as shown in the Figs. 9 and 10. For this, the expander device of the third example of embodiment differs from the second embodiment in that the second edge 32 of the first laminar body 30 and the first edge 41 of the second laminar body 40 are curved-convex of according to said convex arched configuration of one of the opposite 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 another of the opposite panels 11 of structure 10. In addition, the binding fin 35 is formed on the rectilinear edge 42 of the second laminar body 40 of the expander device. The first edge rectilinear 31 of the first laminar body 30 as well as the second rectilinear edge 42 of the second laminar body 40 and the corresponding the binding fin 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 inner 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 the mentioned side edges of panels 11, 12. In the situation expanded, the dihedral formed by the second laminar body 40 and the binding fin 35 constitutes a reinforcing profile that cooperates in keep the flat configuration of panel 11 of structure 10 of the exhibitor.

An expander device is shown in Fig. 11 according to a fourth embodiment similar to the third exemplary embodiment, but which differs from it essentially in than 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, what the expander device of the fourth example does 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 fin of union 35, which, in an operational situation, is linked to the internal surface of said flat panel 11, 12 of structure 10 in a position such that the fulcrum line of the expander device is substantially perpendicular to the mentioned edges side panels 11, 12.

In Fig. 12 shows an expander device of according to a variant of the fourth embodiment, which It is adapted to be installed in a folding display self-expanding hexagonal cross section, as shown in Fig. 13. The folding self-expanding sectional display Hexagonal transverse has a structure 10 formed by six flat panels joined to each other by their side edges and faced two to two. Between the panels the expander device according to this room variant exemplary embodiment, which differs from it 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 panels 11, 12 of structure 10 of the exhibitor. From the second edge 42 of the second laminar body 40 extends a binding fin 35, which, in an operational 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 fulcrum line of the expander device is substantially perpendicular to the mentioned side edges of the panels 11, 12. Thus, in the expanded situation shown in Fig. 13, the second edge 32 of the first laminar body 30 and the first edge 41 of the second body laminate 40 press against the inner face of one of the panels facing 11 of the structure 10 of the exhibitor and the first edge 31 of the first laminar body 30 and the second edge 42 of the second laminar body 40 press against the inner face of the other of the facing panels 12 of the structure 10 of the exhibitor, collaborating in the maintenance of the flat configuration of the same.

In Figs. 14A, 14B, 15 shows a expander device according to a fifth example of realization very similar to the second embodiment, of which  basically differs in that all opposite edges 31, 31, 41, 41 of the first and second laminar bodies 30, 40 are curved-convex This is because, unlike of the expander device of the second embodiment, the expander device of the fifth embodiment is intended to be installed in an exhibitor consisting of a structure 10 of ogival cross section but with the line of fulcrum of the expander device arranged in one position horizontal, as shown in Fig. 16. To do this, from the second edge 32 of the first laminar body 30 extends a fin of joint 35 that is attached to an inner face of one of the panels 11, 12 of structure 10 of the exhibitor. In this case the edges curved-convex 31, 31, 41, 41 of the first and second laminar bodies 30, 40 of the expander device cooperate in maintaining the arched configuration of panels 11, 12 faced of the structure 10 of the exhibitor in the situation expanded.

In Figs. 17 and 18 a device is shown expander according to a variant of the fifth example of realization, specially designed to be installed in a self-expanding folding display with an elliptical cross section or circular. The difference from the fifth expander device embodiment example lies essentially in the profile of the curved-convex edges of the first and second laminar bodies 30, 40 adapted to the arched configuration specific to the cylindrical display. Here, the fulcrum line of expander device is arranged in a horizontal position, such as shown in Fig. 18.

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

In Figs. 22A, 22B and 23 a expander device according to a seventh example of similar embodiment to the second embodiment except in that, here, the first laminar body 30 (Fig. 22A) 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 fold line 35a between the connecting flap 35 and the insertion portion 34 is composed of two fold line portions at an angle each other side by side of said first fold line longitudinal 39. The second laminar body 40 (Fig. 22B) has here a second longitudinal fold line 49 extending from the one to the other of its first and second opposite edges 41, 42 and along of the limiting appendix 47. In addition, the slit 43 is composed of two slit portions forming an angle to each other side by side of said second longitudinal fold line 49, and the line of fold 47a at the base of the limiter appendix 47 is composed of two fold line portions forming an angle to each other to side and side of said second longitudinal fold line 49. With this construction, when insertion portion 34 of the first laminar body 30 is inserted into slit 43 of the second body laminar 40 and elastic band 5 is placed in position, the expander device is able to adopt a flat position (not shown) with the first and second laminar bodies 30, 40 overlays and. However, due to the traction exerted by the elastic band 5, the expander device adopts a position expanded in which both the first laminar body 30 and the second laminar body 40, including the limiting appendix 47, is fold along the first and second longitudinal fold lines 39, 49 forming respective dihedrals that confer on the device expander a significantly increased resistance in the expanded position.

In Figs. 24A, 24B and 25 a expander device according to an eighth example of similar embodiment to the second embodiment except in which, here, the second laminar body 40 (Fig. 24B) includes some lateral fins 56 connected to the rest of the second laminar body 40 by respective fold lines 57, and the first body Laminar 30 (Fig. 24A) includes appendices 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 bodies laminar 30, 40 are assembled and 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 laminar body 40 to bend along their respective lines of fold 57 to form an angle to the rest of the second laminar body 40, which gives increased resistance to second laminar body 40 and, in general, to the entire device expander

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

In Figs. 28A, 28B and 29 a expander device according to a tenth example of similar embodiment to the second embodiment except in which, here, the first laminar body 30 (Fig. 28A) includes a first additional hitch configuration 64 at one end opposite the first hitch configuration 36 and the second laminar body 40 (Fig. 28B) includes a second hitch configuration 65 in a opposite end of the second hitch configuration 46, which allows, once the first and second laminar bodies 30, 40 are  assembled (Fig. 29), install a second elastic band 66 hooked by its ends to the first and second configurations additional hook 64, 65 in addition to the first elastic band 5 hooked by its ends at the first and second hitch configurations 36, 46, so that the first and second elastic bands 5, 66 are arranged on opposite sides of the expander device by pulling the opposite ends 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, reducing the risk of produce unwanted folds in the first and second bodies laminar 30, 40.

The expander device is shown in Fig. 29 of the tenth embodiment example installed between the two panels 11, 12 of a structure 10 of a self-expanding folding display ogival cross section, where the expander device is set so that the fulcrum line thereof is in a vertical direction parallel to the side edges of the structure 10 of the exhibitor. However, one skilled in the art will understand that the incorporation of two elastic bands 5, 66 can generalize to any of the expander devices of the previous examples of realization, including those configured to be installed with the fulcrum line in a horizontal position perpendicular to the lateral edges of the panels of the exhibitor's structure 10.

In relation to Figs. 30, 31 and 32 se Describe below a self-expanding folding display of according to a first basic embodiment example of the second aspect of the present invention. The exhibitor 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 delimiting edges adjacent sides of two panels 11, 12. From a side edge a connected flap 16 extends from one of the panels 12 to said piece of sheet material 20 by a fold line longitudinal 16a and arranged to be attached 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 edges 16th, 17 opposite sides. Between the two panels 11, 12 of the display stands an expander device of those described more top attached to the inside 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 device expander causes expansion of the expander device so that the first and second laminar bodies 30, 40 thereof push from inside the panels 11, 12 of the structure 10 of the exhibitor to automatically expand the display from a situation collapsed, in which panels 11, 12 are superimposed adopting a flat configuration, up to a service position or expanded situation, shown in Fig. 31, in which the panels 11, 12 adopt a three-dimensional section configuration transverse eyelet capable of standing upright. Pressing the panels 11, 12 towards each other from outside you get a folding the expander device against the force of the band elastic 5 and the adoption of the collapsed situation of exhibitor.

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 zones  corresponding to the ends of the fold lines transverse 18, where the transverse fold lines 18 are join the side edge 16a of the corresponding panel 12, as shown in the enlarged detail of Fig. 30A. These lines of cross fold 18 divide panels 11, 12 into several sections, and preferably, between every 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 panels 11, 12, being in a configuration flat, they are superimposed getting a compact configuration for the exhibitor, suitable for storage and transport. From the mentioned folded situation of the exhibitor, pulling simply up the top edge of one of the two panels 11, 12, the force of the elastic bands 5 causes the expansion of expander devices and self-expansion automatic display to the service position 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 you can appreciate from the expanded details of Figs. 30A, 30B and 32A. In addition, the longitudinal fold lines 17 are aligned with longitudinal cuts 19 in crossing areas with transverse crease lines 18, as can be appreciate from the enlarged detail of Fig. 30B. The various transverse fold lines 18 and the aforementioned cuts longitudinal 19 are intended to facilitate the bending of panels 11, 12 along the transverse fold lines 18 without unwanted tears at the ends, such as It is shown in the enlarged detail of Fig. 32A. The Features of structure 10 of the folding display self-expanding described in relation to Figs. 30, 31 and 32 allow structure 10 to be constructed from a single piece of sheet material joined by its side edges ends, for example with adhesive, or several pieces of material laminate joined by its lateral edges with adhesive, without need of elastic joints using elastic bands, as with the self-expanding folding displays of the prior art. So separate elements and handling and assembly tasks are saved, so the self-expanding folding display of this invention is more economical compared to those in the art previous.

It should be stressed that the characteristics described in relation to Figs. 30, 31 and 32 can generalize to self-expanding folding exhibitors with greater number of panels, such as, for example, those shown in the Figs. 4, 6 and 21 (square cross section, regular hexagonal and irregular hexagonal, respectively) among others, simply properly dimensioning the piece of sheet material 20 and adding a number of longitudinal fold lines 17 required. In general, without it being essential, it is preferred that Exhibitor structure 10 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 planes, both convex arches, or one flat and the other convex arched, such as It has been explained above.

A folding display is shown in Fig. 33 self-expanding 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 the Fig. 33 panels 11, 12 of structure 10 have only one cross fold line 18 each so that they are divided into two overlapping sections, and in each section is arranged an expander device according to the fifth example of 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 one extension portion 37 extending from its second edges 42 and one of the panels 11 of the structure 10 of the exhibitor has a slit 67 formed 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 display expanded in the upright position.

It will be understood that, alternatively, the portion extension 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 could there are two slits 67, one on each panel 11, 12, for two portions extension 37 extending from both first and second laminar bodies 30, 40.

In relation to Figs. 35, 36A, 36B and 36C are Describe below a self-expanding folding display of according to another embodiment of the second aspect of the present invention The display of Fig. 35 comprises two structures 10a, 10b, each of which is built in essence according to the embodiment described more 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 panels Opposites 12a, 12b is a convex arched panel. The two structures 10a, 10b are separated and the display includes an additional panel 15 extending from one to the other covering the space of separation between both. 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 lateral 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 for be arranged in a service position where your panels planes 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 an operation Exhibitor folding. Preferably, the width of the panel additional 15 is approximately equal to the widths of the panels opposites 11a, 11b; 12a, 12b of structures 10a, 10b, so that the exhibitor, from a collapsed situation, can be folded along the side edges 15a, 15b of the panel additional 15 to overlap 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 exhibitor into different overlapping sections and that allow folding the display along the fold lines cross-sections 18 to arrange the various overlapping sections in a flat and compact configuration suitable for storage and Exhibitor transport.

In Figs. 37, 38, 39, 40 a shelf designed to be installed in structure 10 of one any of the exhibitors of the present invention. The shelf it comprises a shelf 50 made of a sheet material, such such as cardboard, corrugated cardboard, plastic, or corrugated plastic, between others, comprising a transverse fold line 50a defining a rear edge 50a and a connecting flap 68, whereby the shelf panel 50 is articulated jointly by said edge rear 50a to the inner face of one of the opposite panels, by example, the first panel 11 (schematically represented in the Fig. 38) of the structure 10 of the display. A front part of shelf panel 50 is passed through an opening 51 formed in the other panel 12 (schematically represented by lines of strokes in Fig. 38) of structure 10. Thus, the panel of shelf 50 can adopt a substantially parallel position and superimposed on panels 11, 12 of structure 10 in the situation collapsed and a position substantially perpendicular to the panels 11, 12 of structure 10 in the expanded situation. Below a reinforcing member 52 is provided on the shelf 50 Made of a sheet material, such as cardboard, corrugated cardboard, plastic, or corrugated plastic, among others. This booster 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 zone center of the reinforcing member 52, which is attached to a face bottom of said shelf panel 50, so that the member of reinforcement 52 may take a flat position superimposed on the panel of shelf 50 in the collapsed situation or a three-dimensional position Zigzag bent in the expanded situation. An elastic element, such as an elastic band 53, is arranged to contract said reinforcing member 52 zigzag by said lines of fold 52b when the structure 10 of the display stops the situation collapsed to the expanded situation. So, the folds in zigzag form dihedrals that confer greater resistance to flexion to the reinforcing member 52, which, in addition, in the position of service of the exhibitor, is supported by its front part on a edge of said opening 51 of panel 12 of structure 10 of the display, and the shelf 50 rests on the member reinforcement 52.

In Figs. 41, 42 and 43 a shelf is shown according to a variant of the shelf described above in relationship with Figs. 37, 38, 39, 40, adapted in this case to a display with a cross section structure 10 ogival. For this, the reinforcing member 52, shown separately in Fig. 41, it includes a transverse fold line 69 slightly raven that defines a binding fin 70, and several longitudinal fold lines 71 substantially perpendicular to said transverse fold line 69. Two of said lines of Longitudinal fold 71 are located in the central part of the reinforcing member 52 defining between them a joint area 72, and the remaining longitudinal fold lines 71 are connected to transverse fold line 69 by respective Forks The reinforcing member 52 is articulated together 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 exhibitor is in the situation collapsed, reinforcement member 52 is in an upright position flat (Fig. 41).

When the structure 10 of the exhibitor adopts the expanded situation, the reinforcing member 52 is bent by the transverse fold line 69 and, under the curvature acquired by first panel 11 of structure 10 of the exhibitor, the reinforcing member is disposed in a horizontal position with a three-dimensional configuration bent in zigzag by the lines of Longitudinal fold 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 (shown schematically by dashed lines in Figs. 42 and 43) of structure 10. The shelf 50 is here a simple panel flat, more or less rigid, adhered superior to the mentioned junction area 72 of reinforcement member 52, and accompanying the reinforcement member 52 in the movements between positions collapsed and expanded.

A person skilled in the art will be able to perform modifications and variations from the examples of embodiment shown and described without departing from the scope of the present invention as defined in the claims attached.

Claims (26)

1. Expanding device for self-expanding folding display, said folding self-expanding display 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 collapsed situation 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), said being 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) that has about first and second edges (31, 32), opposite, and at least a portion insertion (34) extending between at least one stop edge (33) located between said first and second edges (31, 32) and one of said first and second edges (31, 32); Y a second laminar body (40) that has about first and second edges (41, 42), opposite, 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 laminar body (30) is sized to be inserted in said slit (43) of the second sheet body (40) until said edge stop (33) of the first sheet body (30) makes contact with the second laminar body (40); Y where the stop edge (33) and the slit (43) define a fulcrum line along which the first and second laminar bodies (30, 40) can rotate the one relative to the another between a flat position, in which the first and second laminar bodies (30, 40) are superimposed, and a position expanded, in which the first and second laminar bodies (30, 40) are crossed. 2. Device according to claim 1, characterized in that at least one fin extends from at least one of the first and second edges (31, 32; 41, 42) of the first and second laminar bodies (30, 40). of connection (35) for connection to an internal face of one of the panels (11, 12) of the structure (10), where said joint fin (35) is connected to the corresponding first or second laminar body (30, 40) by a fold line (35a). 3. Device according to claim 2, characterized in that the first sheet body (30) has a first hook configuration (36) and the second sheet body (40) has a second hook configuration (46), and said element The traction 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) into the expanded position. 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 extended position. 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 engagement 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). 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 laminar 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. 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. 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 fold line (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 longitudinal fold line (49), and the first sheet 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 engagement 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). 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), said being first and second sheets (3, 4) configured to be joined to internal faces of two panels (11, 12) facing said structure (10). 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 sheet bodies (30, 40 ) of 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. Self-expanding folding display, of the type comprising at least one structure (10) formed from at least two panels (11, 12) facing and joined by their lateral edges, and which 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 (11, 12) and comprising at least one laminar body attached to at least one of the panels (11, 12) said sheet body being able to adopt a flat position together with the panels (11, 12) in said collapsed situation, and a tensile element arranged to rotate, bend or bend the sheet body between the panels (11, 12) and with this causes the expansion of said structure (10), characterized in that said expander device comprises: a first laminar body (30) that has about first and second edges (31, 32), opposite, and at least a portion insertion (34) extending between at least one stop edge (33) located between said first and second edges (31, 32) and one of said first and second edges (31, 32); Y a second laminar body (40) that has about first and second edges (41, 42), opposite, 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 laminar body (30) is sized to be inserted in said slit (43) of the second sheet body (40) until said edge stop (33) of the first sheet body (30) makes contact with the second laminar body (40); Y where the slit (43) and the stop edge (33) define a fulcrum line along which the first and second laminar bodies (30, 40) can rotate the one relative to the another between a flat position, in which the first and second laminar bodies (30, 40) are superimposed, and a position expanded, in which the first and second laminar bodies (30, 40) are crossed. 14. Display according to claim 13, characterized in that from at least one of said first and second edges (31, 32; 41, 42) of the first and second sheet bodies (30, 40) of the expander device extends to the minus a joint flap (35) for attachment to an internal face of one of the panels (11, 12) of the structure (10), wherein said joint flap (35) is connected to the corresponding first or second laminar body (30 , 40) along a fold line (35a). 15. Display according to claim 14, 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). 16. Display according to claim 14, 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 perpendicular to the mentioned side edges of the panels (11, 12). 17. Display according to claim 16, 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). 18. Display according to claim 16, 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). 19. Display according to claim 16, characterized in that said structure (10) comprises two opposite panels (11, 12), one of which is convex arched 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 opposite panels (11, 12) of the display 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). 20. Display according to claim 18 or 19, characterized in that said connecting flap (35) is formed on a rectilinear edge of the first and second edges (31, 32; 41, 42) of the first and second sheet bodies (30, 40) of the expander device, wherein said rectilinear edge has a length that encompasses 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). 21. Display according to claim 17, 18 or 19, 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 first and second opposite 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. 22. Display, according to claim 18, 19 or 20, 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 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) being configured to be arranged with their flat panels (11a, 11b ) aligned with the additional panel (15) to jointly form a mural. 23. Display according to any one of claims 13 to 22, 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 to be attached to one side edge of the other end panels. 24. Display according to claim 23, 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 ), wherein said transverse fold lines (18) allow a folding of the structure (10) from said collapsed situation to a folded situation. 25. Display according to claim 24, characterized in that each of the transverse fold lines (18) is composed of at least three adjacent transverse fold lines, said binding 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). 26. Display according to claim 13, characterized in that it includes at least one shelf comprising: an articulated shelf rack (50) by a rear edge (50a) to the inner face of one of the panels (11, 12) of the structure (10) and passed through an opening (51) formed on the other opposite panel (11, 12) of the structure (10), so that said 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; a reinforcing member (52) made of a material laminar, with a joint area (52a) attached to a lower face of said shelf panel (50) and provided with several fold lines (52b) substantially perpendicular to said rear edge (50a) of the shelf panel (50), so that said reinforcing member (52) can take a flat position in the collapsed situation or a three-dimensional zigzag position in the situation expanded; and at least one elastic element (53) arranged to contract said reinforcement member (52) by folding it in a zigzag along said fold lines (52b) when the structure (10) of the exhibitor for the situation collapsed to the situation expanded.