RU2552976C1 - Display stand - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: method is implemented by means of application of the display stand, containing the awning fibre of rectangular shape strained in two directions. Edges of the awning fibre lean upon the transformable elements, having the known structure and operating by the "scissors" principle, by means of beams. Transformable elements lie in one plane. In order to exclude the intersection of beams, via which the awning fibre is fixed, beams of telescopic structure, increasing its length as awning fibre is tensioned, are proposed to be used.

EFFECT: simplification of design solutions and increase of work reliability of the display stand.

2 cl, 9 dwg

Description

The invention relates to outdoor advertising and can be used in the construction of display stands and billboards.

A known solution [1], consisting of a flat metal frame and web for advertising, fixed on the frame. The frame is made in the form of a frame consisting of horizontal upper and lower beams connected by vertical struts at the ends. The ends of the upper horizontal beams are telescopically inserted into the upper ends of the vertical racks and are equipped with squeeze bolts resting on the ends of the racks. The canvas for advertising is strained in the vertical direction by rotation and the corresponding translational movement of the squeeze bolts. The advantage of the solution [1] is the simplicity of the design.

A known solution [2], consisting of transformable elements with fixed tent canvases. Each transformable element consists of a series of series-mounted sections pivotally connected to each other. A separate section consists of two rectilinear flexurally rigid rods connected to each other (by analogy with scissors) by a hinge assembly located in the middle of each rod. Transformable elements, regardless of the number of sections, are mechanisms with one degree of freedom, and the transformation of one of the sections (changing the angle between the rods) causes a corresponding transformation of the entire element with a change in its width and length.

The advantages of the solution [2] are the ease of tensioning the tent canvas, as well as the compactness of the transformable elements prepared for transportation.

The disadvantages of solutions [1] and [2] are the lack of fixing and the possibility of tensioning the tent web in the horizontal direction. This can lead to the formation of vertical folds and the deterioration of the appearance of these devices.

Known solutions [3-8], allowing the tension of the paintings for advertising in two mutually perpendicular directions.

Solution [3] consists of a flat metal frame designed to support a web of fabric, film or tent materials. The metal frame consists of horizontal beams and vertical posts. Beams and racks have a telescopic structure, which allows you to strain the canvas fixed on the frame in two mutually perpendicular directions. The disadvantages of the solution [3] are the low rigidity of the frame in its plane (due to the lack of connections, the setting of which can prevent the mutual movement of the telescopically connected elements of the struts and beams) and the difficulty of placing tensioning devices.

Solution [4] consists of a flat frame and an information board. An information board made of banner fabric is fixed to the frame by means of a cord threaded into the grommets punched along the perimeter of the board and fixed to the hooks with an interference fit. The disadvantages of the solution [4] are the increased complexity of the installation and tension of the information board and the difficulty of adjusting the tension. As a result, overvoltages in the form of tissue breaks or folds may appear in certain sections of the scoreboard.

The solution [5] consists of a flat frame and an awning web having perimeter pockets in which steel pipes are installed. Awning canopy is fastened to the frame using brackets that hold steel pipes. Awning web tension in both directions is made by bolts. The disadvantage of the solution [5] is the increased complexity of adjusting the tension of the tent canvas due to the large number of tensioning elements.

The solution [6] consists of a frame and an awning web fixed by means of a fastening device, which also performs the function of web tension. The fixing device is made in the form of threaded rods with nuts mounted on the frame around the perimeter. The tension of the web is made either by translational movement of the metal studs during rotation of the nuts, or by the tension of the steel cable mounted around the perimeter of the awning web in a special pocket. The disadvantages of the solution [6] are the increased complexity of adjusting stresses in the tent canvas (when tensioning the sheet with metal studs, due to the large number of tensioning elements) and the uneven nature of the stresses created in the tent canvas (when using a steel cable having a deflection (arrow) between the fixing points )

The solution [7] consists of a frame and an awning web mounted on four rotary shafts mounted on the frame. The web is tensioned by rotating the shafts and wrapping an awning on them. The disadvantage of the solution [7] is the increased complexity of creating the tension of the tent canvas, because the rotation of the shafts must be accompanied by their fixation on the supports (for example, lock nuts), and the adjustment of the previously created tent canvas tension is possible only after releasing the corresponding shaft (loosening the lock nuts). The use of a ratchet mechanism will facilitate the process of tensioning the tent canvas, but will complicate the structural solution of the steel frame.

The solution [8] consists of spatial metal frames and a tent canvas fixed to their front surfaces. Frames consist of horizontal and vertical flat transformable elements mounted perpendicular to the front surfaces. Each transformable element, by analogy with the solution [2], consists of sections. A separate section consists of two rectilinear flexurally rigid rods interconnected by a hinge assembly located in the middle of each rod. Changing the angle between the rods causes a corresponding change in the width and length of the transformable element.

The advantages of the solution [8] are the ease of tensioning the tent canvas, as well as the compactness of the metal frames prepared for transportation.

The disadvantages of the solution [8]:

- the complexity of design solutions, because for tensioning the tent, it is necessary to use transformable elements of two directions (horizontal and vertical);

- the complexity of the nodal connections;

- insufficient rigidity and increased deformability of the metal frames, which entails an uncontrolled decrease in stresses in the tent canvas and uneven tension of the canvas.

Decision [8] is taken as a PROTOTYPE.

The technical task of the invention is the simplification of design solutions and improving the reliability of the demonstration stand.

The technical result of the invention is achieved by the use of a demonstration stand, containing a bi-directional tensile canvas of rectangular shape, based on transformable elements. Transformable elements consist of a series of sequentially arranged sections pivotally connected to each other, each of which consists of two rectilinear flexurally rigid rods, the middle of which are connected to each other by a hinge assembly. Transformable elements lie in one plane, and each of them rests on a rigid motionless frame of the demonstration stand with the help of one articulated-motionless and a number of articulated-motion supports. The edges of the tent canvas are fixed to the beams, each of which is connected using one pivotally-fixed and several movable supports with supporting nodes of the transformed elements.

To exclude the intersection of the beams, for which the tent canvas is fixed, beams of a telescopic structure are used, increasing their length as the canvas is tensioned.

The proposed technical solution is described by the following graphic materials:

In FIG. 1 shows the main view of the proposed demonstration stand (tent canvas in a relaxed state), the main option.

In FIG. 2 shows the main view of the proposed demonstration stand in operational condition (tent canvas strained), the main version.

In FIG. 3, 3a is a view A of FIG. 1 (options).

In FIG. Figure 4 shows a fragment of a transformable element straining the tent canvas of a demonstration stand.

In FIG. 5 is a schematic diagram of a junction node for flexurally rigid rods constituting a section of a transformable element straining an awning web of a demonstration stand (view B of FIG. 4).

In FIG. Figure 6 shows a fragment of the proposed demonstration stand: the tent canvas rests on a beam of a telescopic structure. Shown are the temporary struts necessary for the installation of a demonstration stand, fixing the transformable elements in a given position.

In FIG. 7 shows a stepped section 1-1 of FIG. 6.

In FIG. 8 is a schematic diagram of the transformation of a single section of a transformable element.

The proposed technical solution (Fig. 1, 2) contains a bi-directional tent-shaped canvas 1 of a rectangular shape, supported by transformable elements 4. Awning fabric 1 is intended to demonstrate graphic or textual information, for example, of an advertising nature.

The design of the transformable elements 4 is known. They consist of a series of consecutive sections 11 pivotally connected to each other in nodes 14 (Fig. 4). Each section 11 consists of two rectilinear flexurally rigid rods 12, the middle of which are connected to each other by a hinge assembly 13 (Fig. 5).

Transformable elements 4, regardless of the number of sections 11, are mechanisms with one degree of freedom, and the transformation of one of the sections (changing the angle between the rods 12) causes a corresponding transformation of the entire element 4 with a change in its width and length.

The edges of the tent web 1 are fixed to the beams 2 and 3. The attachment points of the tent web to the beams are known and are not the subject of the proposed technical solution.

At the intersection of beams 2 and 3 (Fig. 1, 2), a groove 24 is provided in the wall of the beam 3, into which the end of the beam 2 is inserted. The design of the groove 24 is known, for example, a slot (Fig. 3). It is possible to perform beams 3 of a cross-section, for example, of channels (Fig. 3a). The dimensions of the groove are taken by calculation and should provide the possibility of linear displacements of the end of the beam 2 along the beam 3 when tensioning or weakening the tent.

Each beam (2, 3) is connected to the support nodes 5 of the transformable elements 4 using one pivotally fixed 7 and several movable 6 supports (for example, guides along the beam 2 along which the support nodes 5 provided with rollers move), the construction of which is known.

Transformable elements 4 lie in the same plane. Each element 4 is supported by a rigid stationary outer frame 10 of the demonstration stand using one articulated-motionless 9 and a number of articulated-motion 8 supports. The design of the supports 8 and 9, as well as the outer frame 10 is known and is not the subject of the proposed technical solution. The outer frame 10 is installed in a known manner on the foundations.

A solution is proposed (Fig. 6), avoiding the intersection of beams 2 and 3, and, as a result, not requiring the installation of grooves 24 (in Fig. 3). Moreover, the beams 2, made telescopic, change their length with the transformation of the elements 4. The design of the beams of the telescopic structure is known and is not the subject of the proposed technical solution.

Elimination of the appearance of folds in the supporting zones 20 of the tent web 1 when using beams 2 of a telescopic structure (Fig. 6, 7) having a non-constant outer size (diameter) is possible by various known methods, for example, using bushings 23 worn on a pipe 22 of smaller diameter, entering the pipe 21 of a larger diameter. Moreover, the outer diameter of the bushings 23 is equal to the maximum diameter of the telescopic beam 2. The length of the sleeve is equal to the free portion of the pipe 22 emerging from 21 (with an unstrained tent canvas 1), minus the overall size of the support unit 5 of the transformable element 4.

The work of the proposed technical solution is to demonstrate advertising information printed on the tent canvas 1.

The blade 1, for the possibility of its operation (eliminating the formation of folds, the perception of wind loads, etc.) is strained in two directions with the help of transformable elements 4, the construction of which is known, consisting of 14 sections 11 connected in series with each other in nodes, operating according to the principle "Scissors":

- a decrease in the angle α (Fig. 8) between the rods 12 of the section 11 of the transformable element 4 causes a reduction in the width of the section by Δx, an increase in the height of the section by Δy and the transition of section 11 from position 11a to position 11b;

- with a sequential articulation of the same sections 11 (Fig. 4), the transformations of all sections are the same, and the whole set of sections 11, forming the transformable element 4, is a mechanism with one degree of freedom;

- application of the load to the nodes 25 (Fig. 1, 2) by known methods (for example, a shrink sleeve 15 or a steel cable 16) will cause a general decrease in the width of the element 4 by Δх = Δх and its extension by ΔΥ = n · Δу, where n is the number sections 11;

- reducing the width of the element 4 will cause the awning web to elongate along the X axis, and the elongation of the element 4 will cause the awning web to elongate along the Y axis (FIG. 2), and the web 1 will transition from the unstressed state 18 (FIG. 1) to the stressed state 19 (circuit 17 unstressed canvas is shown for comparison in Fig. 2).

The required ratio ΔX / ΔY should be determined by calculation depending on the strength and stiffness characteristics of the tent canvas 1, in the General case, exhibiting anisotropic properties. According to the calculated ratio ΔX / ΔY, the initial angle α between the rods 12 is adopted (Fig. 8).

The geometric immutability of the proposed technical solution is provided by the following:

- the balance along the X axis is provided by a tensile canvas, as well as shrink couplings 15 or strained cables 16;

- balance along the Y axis is provided by fixed supports 9, fastening the transformable elements 4 to the frame of the stand 10, as well as fixed supports 7, fastening the transformable elements 4 to the beams 2, on which the tent canvas 1 rests;

- tent canopy 1, suspended by beams 2, works as a stressed membrane, capable of absorbing external loads and influences perpendicular to the canvas 1. The degree of tension of the tent canvas should be determined by calculation.

Installation of the proposed demonstration stand is as follows:

- a rigid fixed frame 10 is installed;

- transformable elements 4 are attached to the frame 10, to which beams 2 and 3 are attached;

- set the necessary angles α ₁ and α ₂ between the rods 12 of both transformable elements. These angles are approximately equal to the calculated angle α, obtained on the basis of the required ratio Δõ / Δy (Fig. 8), determined by the strength and stiffness characteristics of the tent canvas 1 (in the general case of anisotropic). Differences in the angles α ₁ and α ₂ occur due to inaccuracies in the manufacture of individual parts and parts of the demonstration stand, as well as due to inaccuracies in the assembly. The specific values of α ₁ and α _{2 are} determined "in place" on the basis of the perpendicularity of the beams 2 and 3 to each other;

- temporary fixation of the transformed elements 4 in the position given by the angles α ₁ and α ₂ by setting spacers 26 or 26a (Fig. 6) between two support nodes 5;

- fastening to the beams 2 and 3 of the tent canvas by known methods;

- temporary struts 26 or 26a are dismantled, shrink couplings 15 or cables 16 are installed and tensioned. After reaching the required tension of the tent 1, the elements 15 or 16 are fixed by the usual known methods.

The advantages of the technical solution proposed in this invention include the following:

- the tension of the tent canvas in two mutually perpendicular directions avoids the appearance of folds on the surface, which improves the quality of the displayed image;

- improving the reliability of the operation of the stand, because transformable elements 4 with increased deformability are supported by rigid structures of the frame 10;

- simplification of design solutions and lower cost of the demonstration stand, due to the reduction in the number of transformable elements;

- the compactness of the stand due to the reduction of its thickness (because the transformable elements are installed in the plane of the stand, and not perpendicular to it).

SOURCES

1. RF patent No. 2243596, G09F 15/00, 01/01/2003.

2. US patent No. 2781766, 02/19/1957.

3. US patent No. 2357819, 09/12/1944.

4. The certificate of the Russian Federation for utility model No. 12482, G09F 7/18, 06.23.1999.

5. US patent No. 4800947, ЕВВ 3 / 00.31.01.1989.

6. RF patent No. 2322701, G09F 15/00, G09F 7/20, 12/30/2005.

7. US patent No. 5443003, B05C 17/06, 08/22/1995.

8. US patent No. 4970841, Е04Н 12/18, 11/20/1990 (Prototype).

Claims (2)

1. Demonstration stand, containing a bi-directional tensile canvas of rectangular shape, supported by transformable elements consisting of sections, each of which consists of two rectilinear flexurally rigid rods, the middle of which are connected to each other by an articulated node, characterized in that the transformed the elements consist of a series of sections arranged in series pivotally interconnected, lie in the same plane, and each of them rests on a rigid fixed frame of the demonstration with tenda using one pivotally fixed and a number of pivotally movable supports, and the edges of the tent canvas are fixed to the beams, each of which is connected using one pivotally fixed and several movable supports to the support nodes of the transformed elements. 2. Demonstration stand according to claim 1, characterized in that the beams, for which a tensile tent canvas is fixed, have a telescopic structure.

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