File display device

Abstract

The utility model provides a file showing device in the field of file showing stands, which comprises a base and a bearing frame, the bearing frame is installed on the base, the base is composed of a left bottom frame and a right bottom frame which are mirror images mutually, the bearing frame comprises a plurality of bearing frames, and the left sides and the right sides of the plurality of bearing frames are mirror images mutually. The bearing frames on each side are hinged end to end and arranged in a broken line shape from bottom to top, and one end of the bearing frame located at the bottommost portion is hinged to one end of the bottom frame. The device further comprises shear fork frames and crossed connecting rods, the shear fork frames are arranged on the left side and the right side of the bearing frame, the crossed connecting rods are arranged at the bottoms of the two bearing frames at the same horizontal position, each crossed connecting rod is composed of two connecting rods which are arranged in a crossed mode, and the middles of the two connecting rods are hinged to each other. The file display device can be stretched and folded in the horizontal direction and the vertical direction by combining the shear fork frame on the side face of the bearing frame and the crossed connecting rods at the bottom of the bearing frame, files of different widths can be displayed, and the size is smaller after the file display device is folded.

Description

Technical Field

[0001] The utility model relates to the technical field of document display racks, in particular to a document display device. Background Art

[0002] Intellectual property service businesses usually include trademark services, legal services, project applications, intellectual property consulting or operations, etc. Since the service projects are closely related to policies and are highly professional, it is often necessary to print laws, regulations or related policies into documents or brochures and provide them to interested customers for understanding.

[0003] The document display rack currently in use is similar to the foldable document display rack disclosed in Chinese Patent No. CN201320183426.6 in 2013. The technical solution provided by the patent includes multiple layers, and the adjacent layers are hinged at the head and tail to form a foldable layer structure. Multiple connecting rods are respectively provided on both sides of the layer, and the connecting rods on the same side are hinged at the head and tail to form foldable connecting rod mechanisms on both sides of the layer. The foldable connecting rod mechanisms on both sides are respectively hinged at the middle of both sides of all the layers above the bottom layer, and the surface of the bottom layer is provided with a limit slot. The bottom ends of the foldable link mechanisms on both sides are connected and fixed by support rods, and the support rods are inserted into the limit slots on the surface of the bottom layer. The foldable layer structure can be folded or extended along with the foldable link mechanisms on both sides. The support rods are inserted into the limit blocks to prop up the foldable link mechanism, and then the foldable link mechanism drives the foldable layer structure to be propped up and fixed; when the support rods are withdrawn from the limit slots, the foldable link mechanism will drive the foldable layer structure to be compressed and folded after being unsupported, which is convenient for displaying documents and can be folded to reduce the volume for easy carrying.

[0004] However, due to the different sizes of different documents, brochures or newspapers, when placing larger documents, the edges of the documents are exposed outside the display rack and are easy to fall off. When placing smaller brochures or other unbound documents, the shelves for placing the documents are fixed in size and lack limiters. As a result, the neatly placed brochures are easily scattered when they are taken out, which is inconvenient for subsequent customers to use. There are also problems such as limited file storage capacity and a small scope of application. Summary of the Invention

[0005] The technical problem to be solved by the present invention is how to solve the problems that the existing document and information publicity display racks have limited storage capacity, can only store documents of specific sizes, and have a small scope of application. The purpose of the present invention is to provide a document display device that can be folded and stretched not only longitudinally but also horizontally, so that documents and brochures of different sizes can be placed.

[0006] The technical solution adopted by the present invention is: a document display device, including a base and a load-bearing frame, the load-bearing frame is installed on the base, the base is composed of two left and right bottom frames that are mirror images of each other, the load-bearing frame includes multiple load-bearing frames, the multiple load-bearing frames are arranged on the left and right sides in a mirror image of each other, and the multiple load-bearing frames on each side are arranged in a broken line from end to end and from bottom to top, and one end of the load-bearing frame at the bottom is hinged to one end of the bottom frame; it also includes a scissors frame and a cross-link, the scissors frame is arranged on the left and right sides of the load-bearing frame, the cross-link is arranged at the bottom of the two load-bearing frames at the same horizontal position, and the cross-link is composed of two cross-arranged links with the middle parts hinged to each other.

[0007] The document display device provided by the present invention can achieve the following beneficial effects:

[0008] (1) The traditional placement board for placing documents and picture albums is redesigned into two left and right supporting frames and a cross connecting rod connecting the two supporting frames, so that the two supporting frames can be stretched and contracted in the horizontal direction, thereby being able to place and display documents, certificates, brochures or newspapers and magazines of different sizes, with a wider range of applications.

[0009] (2) The cross link not only facilitates the folding of the carrier frame in the horizontal direction, but also serves as a supporting component in the middle of the two carrier frames when placing documents, thereby supporting the documents and preventing them from falling from the middle of the two carrier frames.

[0010] (3) By making the left and right bottom frames on the base and the left and right supports of the support frame close to each other in the horizontal direction, the document display device can be folded to a smaller size when it needs to be moved or not in use, does not take up space, and is convenient for transportation, carrying or storage.

[0011] (4) After the carrying frames are connected end to end and arranged in a broken line, documents can be placed in the carrying frames that are folded and tilted in different directions, which increases the number of files that can be placed and expands the display area of ​​the files. It is convenient for people in the front and back to view or remove the files, and the display effect is better.

[0012] Preferably, the bottom frame consists of a horizontal surface and a vertical surface, and the cross-section of the bottom frame is L-shaped. A first positioning hole and a first slide groove are provided on the horizontal surface of the bottom frame. The first positioning hole is located on the virtual extension line of the first slide groove, and a serrated adjustment groove is provided at the upper end of the edge where the vertical surface of the bottom frame is located.

[0013] By setting the bottom frame to be L-shaped, there is a blank space above the edge where the horizontal plane of the bottom frame is located, which serves as a storage space for the cross-links at the bottom of the lowest part of the supporting frame after the supporting frame is folded, thereby preventing the supporting frame from interfering with the cross-links when folded, resulting in the problem that the supporting frame cannot be effectively folded; the serrated adjustment grooves serve as multiple limit grooves during folding, and cooperate with other structures to adjust the folding angle and fix the limit.

[0014] Preferably, the supporting frame is composed of a horizontal side plate and a vertical side plate, and the cross-section of the supporting frame is L-shaped, and a second positioning hole and a second slide groove are provided on the horizontal side plate of the supporting frame, and the second positioning hole is located on the virtual extension line of the second slide groove; the front and rear ends of the vertical side plate of the supporting frame are provided with connecting rings and connecting ears, and the two adjacent supporting frames above and below are hinged with the connecting rings and the connecting ears, and the end of the supporting frame close to the second positioning hole is tilted downward.

[0015] By setting the bottom frame to be L-shaped, after the documents are placed on the horizontal side plates of the carrying frame, the vertical side plates of the carrying frame will block and limit the placed documents on both sides, making it convenient to place various unbound brochures or information files without worrying about unbound brochures or documents falling from the side of the carrying frame; the two adjacent carrying frames above and below are hinged to the connecting ears through connecting rings, so that the upper surface of the carrying frame for placing documents faces upward, making it convenient to place documents in the two mirror-image carrying frames on each layer, and at the same time easy to fold.

[0016] Preferably, the downwardly inclined end of the carrying frame at the bottom is hinged to an end of the bottom frame on the same side of the base.

[0017] By hingedly connecting one end of the carrying frame that is tilted downward to one end of the base, the carrying frame is positioned above the base after being folded, thereby facilitating storage of the document display device after being folded.

[0018] Preferably, a baffle is provided on the end of the carrying frame close to the second positioning hole.

[0019] Since the end of the carrying frame adjacent to the second positioning hole is tilted downward, by providing a baffle at the end of the carrying frame where the second positioning hole is opened, when the document display device is extended for use, the baffle can limit the bottom of the placed documents and prevent the documents from sliding off the tilted surface of the carrying frame.

[0020] Preferably, a central connecting column is provided on the side where the vertical surface of the supporting frame is located, and the central connecting column is located in the middle of the virtual connecting line between the connecting ring and the connecting ear; the scissors frame is hinged end to end by multiple connecting arms and arranged in a broken line shape, and the middle part of the connecting arm on the same side is rotatably connected to the central connecting column on the outer wall in the middle of the vertical side of the supporting frame; the connecting arm hinged to the supporting frame is in the opposite direction of inclination to the supporting frame.

[0021] By connecting a scissor frame composed of connecting arms hinged at the end and arranged in a zigzag shape with a supporting frame composed of supporting frames also arranged in a zigzag shape, and the inclination directions of the mutually connected supporting frames and the connecting arms are opposite, a scissor mechanism is formed between the supporting frame and the scissor frame, thereby facilitating the equal-distance lifting and lowering of each supporting frame on the supporting frame, the lifting height can be adjusted, and it has a certain load capacity and can store more files.

[0022] Preferably, a clamping block is provided on the downwardly inclined end of the connecting arm at the bottom, and the shape of the side wall of the clamping block is adapted to the shape of the bottom of the single serrated groove on the adjusting groove.

[0023] By clamping the card block on the bottom connecting arm at different positions in the adjusting slot, the inclination angle of the connecting arm is different, so that the inclination angle of the carrying frame is also different, thereby facilitating the change of the inclination angle of the carrying frame, and then the height of the carrying frame can be changed. At the same time, the card block and the adjusting slot also play a role of limiting and locking. After the carrying frame reaches the required height, the card block is clamped on the adjusting slot to prevent the card block from moving, thereby fixing the connecting arm and thus fixing the inclination angle of the carrying frame.

[0024] Preferably, one end of the connecting rod in the cross connecting rod is rotatably connected to the second positioning holes on the horizontal surfaces of the left and right supporting frames, and the other end of the connecting rod is slidably connected to the second sliding grooves on the horizontal surfaces of the left and right supporting frames.

[0025] By rotatably connecting one end of the cross-link to the second positioning hole on the carrying frame and slidingly connecting the other end to the second slide groove, the left and right mirror-image carrying frames can be kept parallel when they approach or move away from each other under the limiting action of the cross-link. At the same time, since the ends of the carrying frames close to the second positioning holes are tilted downward, one end of the cross-link is always located at the bottom of the carrying frame, which can always support the bottom of the documents placed on the carrying frame, prevent the documents from falling from the bottom of the carrying frame, and facilitate the display of the documents.

[0026] Preferably, a cross link is also provided on the base, one end of the cross link located above the base is rotatably connected to the first positioning hole on the left and right bases respectively, and the other end is slidably connected to the first sliding groove on the left and right bases respectively.

[0027] By also arranging cross links on the base, when the supporting frames move closer to or farther from each other in the horizontal direction, the two bottom frames on the base can also remain parallel to each other and move closer to or farther from each other under the action of the cross links, thereby facilitating the entire document display stand to move closer to each other in the horizontal direction for folding.

[0028] Preferably, a stud is provided at one end of the connecting rod located on the base, and the stud passes through the connecting rod and is threadedly connected to a knurled nut.

[0029] Through the cooperation of the studs and knurled nuts, when the distance between the supporting frames on both sides reaches the required width, the cross-links on the base are fixed to the base under the squeezing action of the studs and nuts, preventing the connecting rods on the cross-links from continuing to rotate, thereby fixing the distance between the two bottom frames and then fixing the width of the supporting frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model in the longitudinal and transverse extended states;

[0032] Figure 2 This is a right side view of the longitudinal machine of the utility model in a transversely extended state;

[0033] Figure 3 It is a state diagram of the longitudinal folding process of the utility model;

[0034] Figure 4 This is a schematic diagram of the structure of the utility model after longitudinal folding;

[0035] Figure 5 This is a schematic diagram of the structure of the utility model after being folded longitudinally and transversely;

[0036] Figure 6 This is a right side view of the utility model after being folded longitudinally and transversely;

[0037] Figure 7 This is a schematic diagram of the three-dimensional structure of the bottom frame of the utility model;

[0038] Figure 8 It is a schematic diagram of the three-dimensional structure of the carrying frame in the utility model;

[0039] Figure 9 This is a schematic diagram of the three-dimensional structure of the cross-links at the bottom of the load-bearing frame in the present invention;

[0040] Figure 10 It is a three-dimensional structural schematic diagram of the cross connecting rod below the bottom frame of the utility model.

[0041] Figure markings: 1-base, 11-bottom frame, 111-adjusting slot, 112-first positioning hole, 113-first slide slot, 114-rotating column, 2-carrying frame, 21-carrying frame, 211-connecting ring, 212-connecting ear, 213-center connecting column, 214-second positioning hole, 215-second slide slot, 216-baffle, 3-scissors frame, 31-connecting arm, 32-block, 4-cross connecting rod, 41-connecting rod, 411-slider, 42-stud, 43-knurled nut. DETAILED DESCRIPTION

[0042] The following will be combined with the Figure 1-10The technical solution of the present invention is described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0043] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0044] Example 1

[0045] The following is further described in conjunction with specific embodiments. Figure 1-10 As shown, this embodiment is a document display device, including a base 1 and a carrier 2, the carrier 2 is installed on the base 1, the base 1 is composed of two bottom frames 11 on the left and right sides that are mirror images of each other, the carrier 2 includes multiple carrier frames 21, multiple carrier frames 21 are arranged on the left and right sides in a mirror image, and the multiple carrier frames 21 on each side are hinged end to end and arranged in a broken line from bottom to top, and one end of the carrier frame 21 at the bottom is hinged to one end of the bottom frame 11; it also includes a scissor frame 3 and a cross link 4, the scissor frame 3 is arranged on the left and right sides of the carrier 2, the cross link 4 is arranged at the bottom of the two carrier frames 21 at the same horizontal position, and the cross link 4 is arranged at the bottom of the two carrier frames 21 at the same horizontal position. The fork link 4 is composed of two cross-arranged links 41 hinged to each other in the middle. The traditional placement board for documents and albums is redesigned into two left and right carrying frames 21 and a cross link 4 connecting the two carrying frames 21, so that the two carrying frames 21 can be stretched and contracted in the horizontal direction, so that documents of different sizes can be placed and displayed, and the volume after contraction and folding is smaller, which is more conducive to transportation or storage; the cross link 4 not only facilitates the folding of the carrying frames 21 in the horizontal direction, but also can serve as a supporting component in the middle of the two carrying frames 21 when documents are placed, playing the role of supporting documents and combining with the carrying frames 21 to prevent documents from falling.

[0046] Reference Figure 7As shown, in this embodiment, the bottom frame 11 is composed of a horizontal plane and a vertical plane, and the cross-section of the bottom frame 11 is L-shaped, and a first positioning hole 112 and a first slide groove 113 are provided on the horizontal plane of the bottom frame 11. The first positioning hole 112 is located on the virtual extension line of the first slide groove 113, and a serrated adjustment groove 111 is provided at the upper end of the side where the vertical plane of the bottom frame 11 is located. By setting the bottom frame 11 to be L-shaped, there is a blank space above the side where the horizontal plane of the bottom frame 11 is located, which serves as a storage space for the cross-link 4 at the bottom of the lowest supporting frame 2 after the supporting frame 2 is folded, thereby preventing the supporting frame 2 from interfering with the cross-link 4 when folding, resulting in the problem that the supporting frame 2 cannot be effectively folded; the serrated adjustment groove 111 serves as multiple limit grooves during folding, and cooperates with other structures to achieve the function of fixed limit.

[0047] Reference Figure 8 As shown, in this embodiment, the carrying frame 21 is composed of a horizontal side plate and a vertical side plate, and the cross-section of the carrying frame is L-shaped. The horizontal side plate of the carrying frame 21 is provided with a second positioning hole 214 and a second slide groove 215, and the second positioning hole 214 is located on the virtual extension line of the second slide groove 215; the front and rear ends of the vertical side plate of the carrying frame 21 are provided with a connecting ring 211 and a connecting ear 212, and the two upper and lower adjacent carrying frames 21 are hinged to the connecting ear 212 through the connecting ring 211, and the end of the carrying frame 21 close to the second positioning hole 214 is tilted downward, through By setting the bottom frame 11 to be L-shaped, after the documents are placed on the horizontal surface of the carrying frame 21, the handling surface of the carrying frame 21 can play a role of blocking and limiting, so that it is convenient to place various unbound brochures or information files, and there is no need to worry about unbound brochures or documents falling from the side of the carrying frame 2; the two adjacent carrying frames 21 above and below are hingedly connected to the connecting ears 212 through the connecting ring 211, so that the upper surface of the carrying frame 21 for placing documents faces upward, thereby facilitating the placement of documents in the two mirror-image carrying frames 21 on each layer, and at the same time facilitating folding.

[0048] Reference Figure 1 or Figure 3 As shown, in this embodiment, the downwardly inclined end of the carrying frame 21 located at the bottom is hinged to one end of the bottom frame 11 on the same side of the base 1. By hingedly connecting the downwardly inclined end of the carrying frame 21 to one end of the base 1, the carrying frame 21 is located above the base 1 after being folded, thereby facilitating the storage of the document display device after being folded.

[0049] Reference Figure 1 or Figure 3-5 or Figure 8As shown, in this embodiment, a baffle 216 is provided at the end of the carrying frame 21 near the second positioning hole 214. Since the end of the carrying frame 21 near the second positioning hole 214 is tilted downward, by providing the baffle 216 at the end of the carrying frame 21 near the second positioning hole 214, when the document display device is extended for use, the baffle 216 can limit the bottom of the placed documents and prevent the documents from sliding off the tilted surface of the carrying frame 21.

[0050] Reference Figure 1-3 and Figure 8 As shown, in this embodiment, a central connecting column 213 is provided on the side where the vertical surface of the supporting frame 21 is located, and the central connecting column 213 is located in the middle of the virtual connecting line between the connecting ring 211 and the connecting ear 212; the scissors frame 3 is composed of multiple connecting arms 31 hinged end to end and arranged in a broken line, and the middle part of the connecting arm 31 on the same side is rotatably connected to the central connecting column 213 on the outer side wall in the middle of the vertical side of the supporting frame 21; the connecting arm 31 rotatably connected to the supporting frame 21 is in the opposite direction of inclination to the supporting frame 21, and the scissors frame 3 formed by hinged end to end and arranged in a broken line is connected to the supporting frame 21 composed of the supporting frames 21 arranged in the same broken line, and the inclination directions of the mutually connected supporting frames 21 and the connecting arms 31 are opposite, so that the supporting frame 2 and the scissors frame 3 form a scissors mechanism, which facilitates the equal lifting and lowering of each supporting frame 21 on the supporting frame 2, the lifting height can be adjusted, and it has a certain load capacity and can store more documents.

[0051] Reference Figure 3-5 As shown, in this embodiment, a block 32 is provided on the downwardly inclined end of the connecting arm 31 located at the bottom, and the shape of the side wall of the block 32 is adapted to the shape of the bottom of the single serrated groove on the adjusting groove 111. By clamping the block 32 on the connecting arm 31 located at the bottom at different positions in the adjusting groove 111, the inclination angle of the connecting arm 31 is different, so that the inclination angle of the supporting frame 21 is also different, thereby facilitating the change of the inclination angle of the supporting frame 21, and then the height of the supporting frame 21 can be changed. At the same time, the block 32 and the adjusting groove 111 also play a role of limiting and locking. After the supporting frame 21 reaches the desired height, the block 32 is clamped on the adjusting groove 111 to prevent the block 32 from moving, thereby fixing the connecting arm 31 and fixing the inclination angle of the supporting frame 21.

[0052] Reference Figure 4As shown, in this embodiment, one end of the connecting rod 41 in the cross-link 4 is rotatably connected to the second positioning holes 214 on the horizontal surfaces of the left and right supporting frames 21, and the other end of the connecting rod 41 is slidably connected to the second sliding grooves 215 on the horizontal surfaces of the left and right supporting frames 21. By rotatably connecting one end of the cross-link 4 to the second positioning holes 214 on the supporting frame 21 and slidingly connecting the other end to the second sliding grooves 215, the left and right mirror-image supporting frames 21 can be kept parallel when they approach or move away from each other under the limiting action of the cross-link 4. At the same time, since the end of the supporting frame 21 close to the second positioning hole 214 is tilted downward, one end of the cross-link 4 is always located at the bottom of the supporting frame 21, which can always support the bottom of the documents placed on the supporting frame 21, preventing the documents from falling from the bottom of the supporting frame 21, making it easier to display the documents.

[0053] Reference Figure 3 As shown, in this embodiment, a cross link 4 is also provided on the base 1. One end of the link 41 in the cross link 4 located above the base 1 is rotatably connected to the first positioning hole 112 on the left and right bases 1 respectively, and the other end is slidably connected to the first slide groove 113 on the left and right bases 1 respectively. By also providing the cross link 4 on the base 1, when the supporting frame 21 approaches or moves away from each other in the horizontal direction, the two bottom frames 11 on the base 1 can also remain parallel to each other and move closer or farther away under the action of the cross link 4, thereby facilitating the overall folding of the document display stand closer to each other in the horizontal direction.

[0054] Reference Figure 10 As shown, in this embodiment, a stud 42 is further provided at one end of the connecting rod 41 located on the base 1, and the stud 42 passes through the connecting rod 41 and is threadedly connected to a knurled nut 43. Through the cooperation of the stud 42 and the knurled nut 43, when the distance between the supporting frames 21 on both sides reaches the required width, the cross connecting rod 4 on the base 1 and the base 1 are fixed under the extrusion action of the stud 42 and the knurled nut 43, preventing the connecting rod 41 on the cross connecting rod 4 from continuing to rotate, thereby fixing the distance between the two bottom frames 11, and then fixing the width of the supporting frame 2.

[0055] Example 2

[0056] When using the present invention, documents or brochures can be placed on the left and right carrying frames 21 of each layer. According to the width of the displayed documents, the two bottom frames 11 on the base 1 are moved away from each other. When the width between the two carrying frames 21 reaches the width of the documents to be displayed, the knurled nut 43 is tightened so that the knurled nut 43 and the stud 42 squeeze the horizontal surface of the connecting rod 41 and the bottom frame 11, preventing the connecting rod 41 from continuing to rotate in the first positioning hole 112, thereby limiting the two bottom frames 11 from moving away from each other, and further preventing the two mirror-image carrying frames 21 in the carrying rack 2 from moving away from each other. Finally, the width of the document display device is fixed after adjustment, so that documents of different widths can be placed.

[0057] When adjusting the height, lift the carrier 2 upwards, and the carrier 2 and the scissor frame 3 are combined to form a scissor mechanism. Figure 2 As shown, each layer of the supporting frame 21 in the supporting frame 2 is stretched synchronously. In the broken line structure formed by the multi-layer supporting frames 21, the angle between the two adjacent supporting frames 21 gradually increases. When the desired angle is reached, the block 32 on the bottom connecting arm 31 of the scissor frame 3 is clamped in the adjustment groove 111 on the bottom frame 11 to prevent the connecting arm 31 from continuing to rotate. The angle of the supporting frame 21 is limited by the connecting arm 31 in the scissor frame 3, so that the tilt angle of the supporting frame 21 is fixed, and finally the desired display angle is achieved.

[0058] Since the multiple carrier frames 21 are connected end to end and arranged in a broken line, the carrier frames 21 with different tilt angles face oppositely, so that after placing documents in each layer of carrier frames 21, the front and back of the document display device both have carrier frames 21 facing upwards, such as Figure 1 As shown, documents can be displayed on both the front and back sides of the document display device.

[0059] Example 3

[0060] After use, lift the carrying frame 21 upward and tilt the entire carrying frame 2 toward the end away from the block 32, so that the block 32 is out of the adjustment slot 111, and then press the carrying frame 21 downward to reduce the angle between the two adjacent carrying frames 21 until the two adjacent carrying frames 21 are parallel to each other. Figure 4 As shown, the carrier 2 is folded to the minimum height;

[0061] Since the carrying frame 21 is L-shaped, the vertical sides of the carrying frame 21 are stacked on each other after the carrying frame 21 is folded, so that there is a certain height space between the horizontal surfaces of two adjacent carrying frames 21. After folding, the cross link 4 will not interfere with the carrying frame 21.

[0062] When folding in the horizontal direction, the knurled nut 43 and the stud 42 are loosened to allow the cross link 4 in the base 1 to move freely, and then the carrier frame 21 in the carrier frame 2 is squeezed from both sides of the carrier frame 2 to make the two mirror-image carrier frames 21 approach each other, and one end of the connecting arm 31 located in the first slide groove 113 slides in the first slide groove 113, and one end of the connecting arm 31 located in the second slide groove 215 slides in the second slide groove 215, so that the angles of the two cross connecting arms 31 in the cross link 4 can change accordingly, and finally the carrier frames 21 on both sides of the mirror-image carrier frames are brought close to each other, as shown in FIG. Figure 5 As shown, the document display device is folded to a minimum volume. Since the folded volume is smaller, it is more convenient to carry or store.

[0063] Directional terms used in this disclosure, such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," to indicate positions or locations, are based on the positions or locations shown in the accompanying drawings and are intended solely to facilitate and simplify the description of this disclosure. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and are therefore not to be construed as limitations on this disclosure. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

[0064] The standard parts used in this application document can all be purchased from the market and can be customized according to the description in the specification and drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A document display device, comprising a base (1) and a support frame (2), wherein the support frame (2) is mounted on the base (1), characterized in that: The base (1) is composed of two bottom frames (11) on the left and right sides that are mirror images of each other. The carrier frame (2) includes multiple carrier frames (21). The multiple carrier frames (21) are arranged on the left and right sides in a mirror image of each other, and the multiple carrier frames (21) on each side are hinged in sequence from head to tail and arranged in a broken line from bottom to top. One end of the carrier frame (21) at the bottom is hinged to one end of the bottom frame (11); the base (1) also includes a scissor frame (3) and a cross connecting rod (4). The scissor frame (3) is arranged on the left and right sides of the carrier frame (2). The cross connecting rod (4) is arranged at the bottom of the two carrier frames (21) at the same horizontal position. The cross connecting rod (4) is composed of two connecting rods (41) that are arranged crosswise and hinged to each other in the middle.

2. The document display device according to claim 1, characterized in that: The bottom frame (11) is composed of a horizontal surface and a vertical surface, and the cross section of the bottom frame (11) is L-shaped. A first positioning hole (112) and a first sliding groove (113) are provided on the side where the horizontal surface of the bottom frame (11) is located. The first positioning hole (112) is located on the virtual extension line of the first sliding groove (113). A serrated adjustment groove (111) is provided at the upper end of the side where the vertical surface of the bottom frame (11) is located.

3. The document display device according to claim 2, characterized in that: The carrying frame (21) is composed of a horizontal side plate and a vertical side plate, and the end face of the carrying frame is L-shaped. A second positioning hole (214) and a second slide groove (215) are provided on the horizontal side plate of the carrying frame (21), and the second positioning hole (214) is located on the virtual extension line of the second slide groove (215); the front and rear ends of the vertical side plate of the carrying frame (21) are both provided with a connecting ring (211) and a connecting ear (212), and two upper and lower adjacent carrying frames (21) are hinged to the connecting ear (212) through the connecting ring (211), and the end of the carrying frame (21) close to the second positioning hole (214) is tilted downward.

4. The document display device according to claim 3, wherein: One end of the downwardly inclined carrying frame (21) at the bottom is hinged to one end of the bottom frame (11) on the same side of the base (1).

5. The document display device according to claim 3, characterized in that: A baffle (216) is provided on the end of the carrying frame (21) close to the second positioning hole (214).

6. The document display device according to claim 3, characterized in that: A central connecting column (213) is provided on the edge where the vertical surface of the supporting frame (21) is located, and the central connecting column (213) is located in the middle of the virtual connecting line between the connecting ring (211) and the connecting ear (212); the scissor frame (3) is hinged end to end by a plurality of connecting arms (31) and arranged in a broken line, and the middle of the connecting arm (31) on the same side is rotatably connected to the central connecting column (213) on the outer side wall of the middle of the vertical edge of the supporting frame (21); the connecting arm (31) hinged to the supporting frame (21) is tilted in the opposite direction to the supporting frame (21).

7. The document display device according to claim 6, characterized in that: A clamping block (32) is provided on one end of the downwardly inclined connecting arm (31) at the bottom, and the shape of the side wall of the clamping block (32) is adapted to the shape of the bottom of the single sawtooth groove on the adjusting groove (111).

8. The document display device according to claim 3, wherein: One end of the connecting rod (41) in the cross connecting rod (4) is rotatably connected to the second positioning holes (214) on the horizontal surfaces of the left and right supporting frames (21), and the other end of the connecting rod (41) is slidably connected to the second sliding grooves (215) on the horizontal surfaces of the left and right supporting frames (21).

9. The document display device according to claim 1, wherein: A cross link (4) is also provided above the base (1), and one end of the link (41) in the cross link (4) above the base (1) is rotatably connected to the first positioning holes (112) on the left and right bases (1), and the other end is slidably connected to the first sliding grooves (113) on the left and right bases (1).

10. The document display device according to claim 9, characterized in that: One end of the connecting rod (41) located above the base (1) is further provided with a stud (42), which passes through the connecting rod (41) and is then threadedly connected to a knurled nut (43).

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