PL168703B1 - Frame consisting ofd build up components for mounting illuminated advertisment sings on flexible material - Google Patents

Abstract

1 A framework of elements for disassembly of illuminable advertising signs on flexible materials with metal elements. 1 tensioning devices, of the type of discontinuous elements, which can be tensioned using screws, characterized by the fact that they have rod-type elements (11), with a four-cornered cross-section, heights corresponding to the height of the advertisements, set vertically, parallel to each other, in the steps demarcated and equal to each other in the vertical plane new, but at least one pair of elements (1) located on the edges of the edges is formed in the shape of the letter "L", placed after imo, parallel to each other, opposite the opposite ends of the vertical elements (11), which means that these elements they are placed in opposite directions, maintaining the mirror reflection position, while each of the elements has a length equal to the length along the the entrance of the advertising sign, in addition, there is a framework of rectangular (1 4 ) elements with a triangular structure, coupled jointly, and at the end vertical elements (1 1 ) with a four-cornered cross-section, equal to the steps and their opposite planes - a rectangular triangle inclined upwards or backwards downwards, in such a way that they were placed in opposition to the mirror image of the position, with each ele ment ( 1 4 ) with a triangular cross-section, it has a U-shaped edge, in which the central longitudinal axis is located at an angle of 4-5 °C in relation to the answer to its vertical element (1 1 ) creating a four-cornered nest integral with this vertical element, further the frame has at least one pair rod elements (17) with a closed chain, with a length corresponding to the length in the mentioned edge, elements in the shape of the letter "L", each with an element elements (17) against the swarm of the closure are fastened co-planarly, on the upper side or on the lower side of the rod elements (1) in the shape of the letter "L" ", each of the (1 7 ) rod elements with a closed cross-section has a continuous projection (1 7 b) intended to support the elastic material, for which the advertising sign is rhymed with a painted sign and a continuous, four-cornered slot intended to accommodate the advertising device and a continuous, flat top surface (17a) , with groove (26) fig.1 PL PL PL PL

Description

The present invention relates to a frame made of detachable elements for illuminated advertising signs on a flexible material, some of which are typical elements, for the attachment and display of advertising signs made on a flexible material, signs of large size, visible from a long distance, placed on permanent structures, such as like buildings and gas stations.

Supporting and exposition structures of illuminated inscriptions on surfaces made of flexible material usually have the form of a rectangular box of large dimensions in terms of length and width, while those of shallow depth, the inscriptions are illuminated with fluorescent lamps or other light sources placed inside the cuboid-shaped housing, close to the surface reflecting light. In some cases, the surface of a flexible, transparent or translucent

168 703 of the material is tensioned on a rectangular frame structure and pivotally secured to the upper edge of the housing with hinges or U-shaped elements to allow access to the inside of the housing for mounting, cleaning, lamp replacement, or other maintenance.

In other types of such constructions, the supporting and tensioning devices for the flexible material on which the sign is made are made of rod support elements shaped to allow the material to be wrapped around the edge of the structure itself, and then to tension the material inside the casing by winding it on metal bars which can be stretched in the elements inside the box-shaped housing; in this way, the use of an edging frame supporting the marked material can be avoided.

In practice, such types of illuminated advertisements, both a solution with a border frame and a solution with a flexible material with an inscription placed frontally on the openable housing, have a number of serious drawbacks, such as low stiffness of the connections of the supporting and tensioning elements, poor tightness allowing water penetration and dust between the housing and the frame and the tensioning elements, and difficult access to the inside of the housing.

In fact, in the case of an arrangement with an upward opening frame structure, a snap-on suspension system allowing the frame to pivot around the upper horizontal edge of the box requires that a very long continuous opening be provided on said horizontal edge while using the same length of a shaped hinge. the letter U placed on the edge of the rotatable frame. There must be a wide gap between the opening and the hinge to allow rotation in the support of the elastic material support and the bearing of the tensioning devices, which in any case requires a continuous gap open upwards. This method of mounting causes water and dust to accumulate, which can enter the inside of the box-shaped housing.

Moreover, some elements of the support structure are placed in front of the lighting lamps, which causes undesirable shadows on the advertising sign.

To avoid most of the above disadvantages, Italian Patent No. 00218964, filed on November 8, 1989, by the same applicant proposes a tensioning support structure for illuminated signs on a base of flexible material, composed of an appropriate number of metal elements forming a support frame, openable in the form of a shutter on box-type body with an illuminated interior, said structure is characterized by high rigidity, it can be easily and quickly attached to the housing, and at the same time it can be easily opened with an opening angle of up to 180 ° C, which explains the advantages such as ease of installation, operation and cleaning .

Unfortunately, in practice, this structure has shown the disadvantage that the upward openable support frame of the flexible material is heavy and, when it comes to changing the size of the housing, whether it is to change the depth or the length or the width, the components of which it is constructed the supporting structure must be completely replaced.

Therefore, the object of the present invention is to propose a support frame for supporting and tensioning an illuminated advertisement constituting a plane made of flexible material, which frame has such a structure that the disadvantages and inconveniences of the solutions used so far are avoided, and mainly provides high rigidity, and provides easy and quick access to individual elements placed in the frame supporting structure, as well as capable of ensuring uniform brightness of the entire surface of the advertising sign and not allowing the formation of undesirable shadows on the advertising surface.

Another object of the present invention is to provide an advertising sign support structure conceived to be at least partially standardized and thus adaptable to different sizes of housings, to require a small number of metal components, both rod and surface, to be easily and quickly assembled. , also at the place of installation, and moreover, it secured perfect tightness against weather conditions in all conditions.

These, as well as other objectives and advantages, which will be described below, are obtained by applying a frame made of detachable elements to illuminated advertising signs on the material.

168 703 flexible, to support and tension an illuminated advertisement, made on a transparent or translucent, flexible material plane, using turnbuckle-type tensioning elements, the mounting of which is achieved by means of tightening bolts, the frame according to the present invention being characterized in that has square-shaped bar elements with a height corresponding to the height of the advertisement, vertically aligned, parallel to each other, at predetermined intervals and aligned with each other in the vertical plane, with at least one pair of bar elements located on the edges being L-shaped, placed horizontally, parallel to each other, at opposite ends equidistant vertical elements, which causes that these elements are mutually opposed, maintaining a mirror image of the position, each element having a length equal to the length of the floors on the wall of the advertising sign, in addition, the frame has rectangular elements with a triangular cross-section, detachably attached in pairs, at the end of the vertical elements with a quadrilateral cross-section, at equal intervals and at their hypotenuse planes inclined upwards or downwards, respectively, in such a way so that they are positioned opposite to each other, with a mirror image of the position, each of the triangular-section elements having a bent U-shaped edge in which the central longitudinal axis is at an angle of 45 ° to the corresponding vertical element forming the quadrilateral socket integral with this vertical member, further the frame has at least one pair of closed section bar members with a length corresponding to the length of said edge of the L-shaped members, each of the closed section members being attached to and coplanar on the upper side or on the lower side of the elements in L-shaped bar elements, and of closed-section bar elements, it has a continuous projection intended to support the flexible material on which the advertising sign is painted, and a continuous, quadrilateral slot intended to accommodate the tensioning device, and a continuous, flat upper surface, with a groove for a seal, a square socket inclined at 45 ° and a continuous, slotted grooves also inclined at 45 ° for sliding mounting of light reflecting plates to allow them to slide one on top of another, moreover, the frame has square-section bar elements arranged at an angle of 45 ° in relation to the above-mentioned vertical elements and anchored at one end, in a socket inclined at an angle of 45 ° to the triangular-section bar elements, and the opposite ends of which are fixed in a U-shaped socket in the closed-section bar elements, with a protrusion supporting material with a sign moreover, the frame has bar elements equipped with slotted sockets inclined at an angle of 45 ° and mounted counterclockwise, in pairs, on each vertical bar element, and has light reflecting plates, slidably mounted in slotted grooves inclined at an angle of 45 °, located in the bar elements with a closed cross-section that support the advertising sign in slot sockets provided in the bar elements attached to each vertical bar element, and has two housings, upper and lower, fixed above and under the supporting structure of the advertising sign, each of these housings being built made of a metal plate, the housings are flush-mounted and have the ability to rotate around the horizontal pins on the lower and upper L-shaped bar elements, they also have fastening devices in the form of a latch or thread, ensuring a permanent connection of the L-shaped bar elements to opposite ends of pi bar elements, vertical bar elements to the wall on which the advertising sign is attached, triangular bar elements to vertical bar elements, housing elements for closed-section bar elements that support the advertising sign, moreover, it has bar elements with slot sockets for individual vertical elements bar.

Preferably, each of the L-shaped horizontal bar elements has, in its upper part, at least one continuous quadrilateral notch, the upper horizontal surface of which is open and provided with a continuous cylindrical projection on which it snaps into place. folded, longitudinal edges of the top and bottom,

168 703 of a horizontal enclosure plate member to allow access to a portion of the housing from the top and / or bottom by releasing the flap member or both from the seal member.

It is also advantageous if the lower and upper horizontal sealing support elements consist of sections or sections of fixed-length metal plate connected to each other by means of at least one connecting element detachably attached in a recess provided in the upper part of the closed-section bar elements, supporting the tension rods.

It is also advantageous for the plates of light-reflecting material to be slidably mounted over one another in parallel grooves formed in rod members detachably connected to vertical rod members placed parallel to each other and at equal intervals so that they slide along the vertical members. and also parallel to the sections of the bar elements with a rectangular section, inclined at an angle of 45 ° C.

It is furthermore advantageous if the quadrilateral vertical bar members and the inclined bar members supporting the tensioning devices have the same cross section, and the plates made of light-reflecting material and the illumination lamps are attached to the vertical bar members.

It is also advantageous for the frame to have metal plates 3 slidably mounted in longitudinal parallel slots at the ends of the vertical portions of the upper and lower L-shaped bar members and intended to form a vertical rear wall of the structure and that the frame has four corners at the corners. the inner edges of the flexible material tensioned on the outer, continuous edges of the horizontal bar elements with a closed section, tensioning and adjusting devices, composed of a pair of tensioning bars attached to the fixed bar elements of the frame structure and to the edges of the tensioned flexible material, located inside the casing, at the corners, under an angle of 90 ° to each other.

The invention is illustrated in the embodiment in the drawing, in which Fig. 1 shows a cross-section of a frame for supporting and tensioning an elastic illuminated advertising sign made according to the present invention, the cross-section shows only a fragment of the upper part of the box-shaped housing, with the lower part of said of the housing is identical to the upper part, fig. 2 - section, on an enlarged scale, of one of the bar elements in the shape of an inverted L letter intended to be connected to opposite ends of mutually opposing vertical bar elements, parallel to each other and also serving to support a vertical sealing wall , in the case where there is no natural supporting wall, fig. 3 - a section, also on an enlarged scale, of one of the U-shaped bar elements, with a closed section, with various longitudinal sockets intended for mounting bar elements with a quadrilateral section, inclined under 45 ° angle and of bars supporting and tensioning the flexible material of the advertising sign, fig. 4 - cross-section of a continuous bar element with a triangular cross-section, used to fasten diagonal bar elements to vertical bar elements, fig. 5 and 6 - also a cross-section of, respectively, a bar element with a closed cross-section used as vertical support for L-shaped bar elements as well as bar elements fastened at an angle of 45 ° to vertical elements, as well as a bar element with sliding guides for accommodating reflective plates, and Fig. 7 - top view of the frame structure of Fig. 1, without the top , an openable metal casing having a device for tensioning the free edges of a flexible material, stretching the 90 ° converging corners of the adjacent edges of the material.

Fig. 1 shows a frame structure supporting and tensioning an illuminated advertising sign painted on a flexible material, according to the present invention, which is composed of a plurality of different layered, extruded bar-like elements made of aluminum or a similar material, suitable for constructing an open structure at least on one of its visible surfaces, filled with a taut flexible material that forms the actual advertising sign.

168 703

The frame of Fig. 1 is intended to be fastened to any support and consists in the embodiment shown of at least two continuous bar edge elements 1, the length of which is equal to the length of the advertising sign to be aligned, and which are arranged parallel to each other on opposite ends, i.e. at the upper and lower ends, of quadrilateral rod elements 11 situated equidistant from one another in a vertical plane. The rod-shaped elements 1 (of which only the upper one is shown in fig. 1) have (fig. 2) an inverted L-shaped cross-section and whose vertical wall la is provided with longitudinal parallel slots 2-2a etc. snap-in method of thin metal plates 3 forming the vertical rear wall of the frame structure. Thin boards 3 do not need to be used where the structure is attached to a solid supporting wall, for example on a brick wall of a building 4.

The upper, horizontal wall 1a of each L-shaped bar element has two continuous rectangular notches 5 and 5a, the upper surfaces of which are partially open and have cylindrical projections 6-6a on opposite sides intended for: the first for resiliently supporting a thin plate or strip metal 7 (fig. 1) to provide a tight seal between the rod element 1 and the wall 4 (or other support on which the structure is mounted, while the other cylindrical projection 6a is the fixed part of the continuous hinge serving to pivotally close, respectively, the upper or lower a metal casing 8 forming the upper or lower sealing wall of the structure.

The longitudinal bar elements 1 have at their sides at least one channel seat 9 or 9a, respectively, for receiving tubular or balloon seals. Moreover, in the vertical wall 1a of each L-shaped bar element there is a square-section channel socket 10 (FIG. 2), the function of which is explained as follows.

Between the inner surfaces 1c and 1d of these L-shaped bar elements, quadrilateral bar elements 11 are positioned, the cross-section of which is shown in Fig. 5, these elements are shown at a predetermined distance so that they can form the basis for further bar elements, which better explains further description. Each closed-section bar element 11 is provided at its ends with protruding projections with quadrilateral heads 12 (Fig. 1), these heads can be inserted in a snap-fit connection into the quadrilateral-section sockets 10 on the vertical surfaces 1a of the opposing bar-shaped elements. letters L.

For this reason, the set of vertical bar elements 11 forms with the L-shaped bar elements a rigid frame to which the rear closing wall is connected, made of thin plates 3 slidingly fastened in the opposing guide slots 2 - 2a, while when the structure is fastened to a full wall (for example brick) 4, said boards need not be used. Each of the vertical bar elements 11, which are attached at equal distances between each other along the length of the box-shaped housing, has detachably connected pairs of quadrilateral bar elements 13, the cross-section and transverse dimensions of which are the same as the dimensions of the bar elements 11. Said bar elements 13 they are mounted at an angle of 45 ° with respect to the vertical rod members, specifically one facing upwards and the other facing downwards.

Each bar element 13, which is positioned at an angle of 45 ° to the common bar element 11, may have a different length that defines the depth of the support structure, the element being detachably anchored to the bar element 11 with an adjustable position, with its end being inserted to a U-shaped seat 14a cooperating with a bar element with a closed cross-section 14 (Figures 1 and 4) having a triangular cross-section.

Said bar element 14 has a rectangular cross-section and is fixed to the bar element 11 by means of fastening means, for example screws 15, so that the U-shaped seat 14a serving the end of the bar element 13 is also inclined at an angle of 45 °.

168 703

The two rod elements 13, inclined at an angle of 45 ° and directed respectively upwards and downwards with respect to the rod-shaped vertical element 11, are then attached to the wall facing the right angle 14b by means of through bolts 16 (in Fig. 1 only the trace is marked with a dotted line) these screws).

At the ends of both sets of inclined bar elements 13 opposite the ends joined to the triangular elements 14, a continuous bar element 17 (Figures 1 and 3) is attached, which is positioned horizontally, transversely to the individual inclined elements. The continuous elements 17 have the same length as the longer wall of the advertising sign 18. The continuous elements 17 constitute the support structure supporting the flexible material forming the advertising sign in a vertical direction, parallel to the vertical rear wall, defined by vertical bar elements 11 (Fig. 1). Each of the bar support elements 17 has a hollow section and two mutually opposing projections 17a forming a square-section trough slot in which the free end of the sloping bar elements 13 is located, which are then attached to the protruding walls of the socket 17a by means of through bolts 19. Said the bar element 17 also has a protrusion 17b terminating in an arcuate end 17a for correctly guiding the flexible material 18 forming an advertising sign on the edge of the bar element, where the material is folded over the rounded edge 17c of said protrusion 17b, and then the folded part of the material is locked in inside the continuous trough seat 20 by means of tension rods of known structure. The tension in the material is performed in a generally known manner by folding the opposite longitudinal edges of the material 18 over the upper and lower protrusions 17c and then winding these edges on the square bars 21 which are then inserted into the socket 20, finally the square bars 21 are tensioned by pressing against the bottom. sockets 20 by means of horizontal strips 22 tightened by screws 23 inserted in the respective threaded holes 24 (Fig. 3); the tensioning device provided by the invention of Italian Patent No. 01236677, filed by the authors of the present patent dated 11/08/89, can be used for tensioning.

Each of the continuous rod elements 17 has a flat upper plane 17e which is flush with the upper surface of the projection 1b of the L-shaped bar element on which the upper and lower sheet metal housing 8 are hinged.

The bar element 17 is provided with a protruding projection 25 and a continuous cutout 26 situated in one plane to accommodate the longitudinal strips which are to join the individual sections (fixed length and the same width) so as to adapt the length to the sealing length the metal casing 8. Each casing plate 8 is fastened to the upper plane of the rod elements 17 by means of equally spaced bolts 27 (FIG. 1).

Since each metal plate of the housing 8 is rotatably mounted on the cylindrical projections 6a, after removing the screws 27 from one or more of the said sectors of this housing, they are lifted and opened (like a hatch), thus accessing the inside of the box-shaped housing from below. and / or above for cleaning, lamp replacement and general maintenance. In the housing, close to and parallel to the upper and lower rod elements 13, there is a wall 28 constructed of light-reflecting material, which is composed of at least two plates 28a and 28b (Fig. 1) slidably mounted on the longitudinal sides of these plates in the rod elements 20 (Fig. 6) detachably, by means of screws, which in turn are attached to the vertical rod elements 11 and have parallel prismatic slots 29a - 29b, with an inclination of 45 °, further reflective plates are attached in these slots, which can be slid one over the other along the structure, on the other side these plates slide in logical, prismatic grooves 30 (fig. 1) produced in the continuous rod-like elements 17.

The described structure allows, by lifting the upper, sealed cover 28 and sliding one reflective plate to the adjacent one so that they overlap one another, to gain access for the operator from above or below to the internal parts contained in the housing.

168 803

Also provided inside the support structure are plates of retroreflective material 31 fastened to vertical rod elements 11, which are present at least on the rear vertical wall 3, standard lamps 32 are also provided in the housing, also fastened to vertical rod elements 11.

In the further part of the present invention, in order to ensure an aesthetic appearance of the plane of the flexible material, and especially in its visible corners to obtain a taut plane, it is provided to provide a tensioning device located in the four corners of the inside of the casing box, this device eliminating any wrinkles or undulations that could occur when the edges of the flexible material with the advertising sign are stretched on both tapering edges (at an angle of 90 °).

Said device consists (as illustrated in Fig. 7) of two tensioning rods 33-33a of variable length, rod-shaped elements 11 or other, placed inside the housing of the elements, these rods having hook-shaped or ring-shaped ends 34 which cooperate with short lengths of cable 35, which in turn connect to the two edges 36-36a of the casing members after said flexible sign material has been applied and stretched over the two opposite sides of the quadrangular frame structure formed by the outer edges 17c of the continuous rod members 17 that secure tension mechanism.

Both edges, irrespective of whether they are wrinkled or corrugated 36 - 36a, are tensioned by a turnbuckle 37 inserted between two sections of a tensioning bar, the axially arranged ends of which enter the turnbuckle and have left and right threads . By twisting the sleeve, the individual edges can be tensioned until all wrinkles and ripples in the four corners of the visible side of the outer surface of the elastic material are eliminated.

As can be seen from the above description, the practical advantages, both technical and economic, of the present invention lie in the possibility of making bar elements with closed sections, which are used both as vertical elements and elements working at an angle and allowing the construction of structures of various sizes, according to According to the invention, in order to increase or decrease the depth of the structure it is sufficient to raise or lower the triangular bar elements 14, whereby it is achieved that the length of the bar elements 13 is correspondingly reduced. Moreover, the above-described cantilever structure can be mounted anywhere, regardless of its dimensions.

Claims (8)

Patent claims 1. A frame with collecting elements for illuminated advertisements on a flexible matrix, having rod vat and tensioning devices, of the discontinuous type, which can be tensioned by means of bolts, characterized in that it has rod elements (11) with a rectangular cross-section, with a height corresponding to the height of the advertisement, positioned vertically, parallel to each other, at designated intervals and aligned with each other in the vertical plane, at least one pair of elements (1) located on the edges being L-shaped, placed horizontally, parallel to each other on the opposite ends of the equidistant vertical elements (11), which causes the elements to be mutually opposed, maintaining a mirror image of the position, each element having a length equal to the length of the longitudinal wall of the advertising sign, moreover, the frame has rectangular elements (14) with a triangular cross-section, fastened with split in pairs, at the end of the vertical members (11) with a quadrilateral cross-section, at equal intervals and with their planes forming the hypotenuse of the triangle, inclined upwards or downwards respectively, in such a way that they are mutually opposed to the mirror image of the position, whereby each of the elements (14) with a triangular section has a bent U-shaped edge in which the central longitudinal axis is at an angle of 45 ° to the corresponding vertical element (11) forming a quadrilateral socket integral with this vertical element, hereinafter the frame has at least one pair of closed section bar elements (17) with a length corresponding to the length of said edge of the L-shaped elements, each closed section element (17) being co-flush mounted on the upper side or on the lower side of the elements L-shaped bar elements (1), and each of the bar elements (17) with a cross-section of has a continuous projection (17b) intended to support the flexible material on which the advertising sign is painted and a continuous, square slot intended to accommodate the tensioning device and a continuous, flat upper surface (17a), with a groove (26) to accommodate a gasket, a square socket 45 ° inclined and continuous grooved grooves (30) also inclined 45 ° for slidably mounting of light reflecting plates (28) to allow them to slide over one another; moreover, the frame has bar elements (13) with a quadrilateral cross-section, placed at an angle of 45 ° in relation to said vertical elements (11) and anchored at one end thereof in a socket (14a) inclined at an angle of 45 ° to the bar elements (14) with a cross-section triangular, and the opposite ends of which are mounted in a U-shaped socket in the closed-section bar elements (17) with a protrusion (17b) supporting the material (18) with an advertising sign, moreover, the frame has bar elements (29) equipped with sockets slotted (29a, 29b) inclined 45 ° and counter-mounted in pairs on each vertical bar element (11) and has light reflecting plates (28), slidably fastened in slotted grooves (30) inclined at an angle of 45 °, located in the bar elements (17) with a closed cross-section that support the advertising sign in slot seats (29a and 29b) provided in the bar elements attached to each bar element, pi of an advertising sign, and has two housings (8), an upper and a lower one, fixed above and below the advertising sign support structure, each of these housings (8) being constructed of a metal plate; the housings (8) are fixed flush with each other and have the ability to rotate around the horizontal pins located on the lower and upper L-shaped bar elements (1), they also have fastening devices in the form of a latch or thread ensuring a permanent connection of the bar elements (1) in L-shaped to opposite vertical ones 168 703 bar elements (11), vertical bar elements (11) to the wall (4) on which the advertising sign is attached, triangular bar elements (14) to vertical bar elements (11), housing elements (8) for bar elements ( 17) with a closed cross-section that support the advertising sign, moreover, it has bar elements with slot sockets for individual vertical bar elements. 2. The frame according to claim A device according to claim 1, characterized in that each of the L-shaped horizontal bar elements (1) has in its upper part at least one continuous notch (5, 5a) with a quadrilateral cross-section, the upper, horizontal surface of which is open and provided with a continuous, a cylindrical projection (6, 6a) on which the bent, longitudinal edges of the upper and lower horizontal plate element closing the casing are fastened by snapping, to allow access to the casing part (8) from the top and / or bottom by releasing the flap-type element or both from the sealing element. 3. The frame according to claim 3. A method according to claim 1 or 2, characterized in that the lower and upper horizontal sealing support elements consist of sections or sections of a metal plate of fixed length, connected to each other by means of at least one connecting element, detachably fastened in a recess (26) provided in the upper part the closed section bar elements (17) supporting the tension bars. 4. The frame according to claim A method as claimed in claim 1, characterized in that the plates (28) of light-reflecting material are slidably slidable over one another in parallel slots formed in rod elements (29, 30) detachably connected to vertical rod elements (11) arranged parallel to each other and in alignment. at intervals so that they are slid along the vertical bar elements (11) and also parallel to sections of the bar elements (13) with a 45 ° inclined quadrilateral section. 5. The frame according to claim 1 The method of claim 1, characterized in that vertical bar elements (11) with a quadrilateral cross section and inclined bar elements (13) supporting tension devices having the same cross section. 6. The frame according to claim The apparatus of claim 1, characterized in that the plates (28) made of light-reflecting material and the illumination lamps (32) are attached to the vertical bar elements (11). 7. The frame according to claim 2. A method as claimed in claim 1, characterized in that it has metal plates (3) slidably mounted in longitudinal, parallel slots (2, 2a) located at the ends of the vertical parts of the upper and lower L-shaped bar element (1) and intended to form a vertical rear wall of the structure . 8. The frame according to claim 4. A method as claimed in claim 1, characterized in that it has, on the four inner corners of the edges of the flexible material stretched on the outer, continuous edges of the horizontal bar elements (17) with a closed cross-section, tensioning and adjusting devices (33, 33a, 34, 35, 36, 36a, 37) constructed a pair of tensioning bars (33, 33a) attached to the fixed rod elements (11) of the frame structure and to the edges of the tensioned flexible material (18) placed inside the housing at the corners at an angle of 90 ° to each other.