Backrest unit connecting structure and seat

Abstract

The backrest unit connecting structure comprises a connecting frame connected with the seat and a backrest unit set installed on the connecting frame, the backrest unit set comprises two or more backrest units arranged side by side, and every two adjacent backrest units are connected through a plastic column with the two ends integrally formed with a backrest unit frame. A plurality of arc-shaped convex rings are vertically arranged on the surface of the plastic column, and the arc-shaped convex rings are connected through arc-shaped concave rings. The chair is simple in structure and can provide a more stable and flexible use supporting effect for a user, and the backrest units can be elastically expanded outwards or shrunk inwards according to the sitting posture of the user which changes at any time, so that the chair can be better attached to the waist and the back of the user, and the user can use the chair more stably and flexibly. The waist and the back of a user can lean more comfortably in different sitting postures, the use comfort is improved, the plastic columns and the backrest unit are integrally formed and connected, an additional installation structure does not need to be arranged, the installation process is omitted, and use is convenient.

Description

Technical Field

[0001] This utility model relates to a seat back, and more particularly to a backrest unit connection structure and a seat. Background Technology

[0002] Modern ergonomic chairs feature headrests for head support, shoulder pillows for shoulder support, lumbar support for lumbar support, and backrests for back support, forming backrest units to provide more comfortable back support. To allow the chair back to flexibly adapt to users of different body types, existing chairs have left and right backrests on the backrest frame to provide suitable support for different lumbar and back shapes. However, because there are no direct connecting parts between the different backrests, some problems still exist. For example, when a user leans against only one backrest, that backrest is subjected to excessive pressure, which can easily damage it and reduce its lifespan. Furthermore, the other backrest does not receive effective support and cannot conform well to the lumbar and back, resulting in poor comfort. To address this, some chairs now use springs to connect the different backrests. When a user leans against only one backrest, it can pull the other backrest to conform, ensuring that each backrest provides its corresponding support. However, spring sheets are mostly made of metal, which is relatively hard and lacks elasticity, making it difficult to deform. This results in poor swing flexibility of the backrest during use, and it cannot conform well to the user's waist and back in time, so its comfort is still not ideal. In addition, spring sheets generally need to be installed on the backrest through an additional mechanism, which increases the installation process and makes the installation more complicated. Utility Model Content

[0003] The purpose of this utility model is to provide a backrest unit connection structure and seat that can better fit the waist or back and improve human comfort.

[0004] The backrest unit connection structure includes a connecting frame connected to the seat and a backrest unit group installed on the connecting frame. The backrest unit group includes two or more backrest units arranged side by side. Adjacent backrest units are connected by plastic columns that are integrally formed with the backrest unit frame at both ends. Multiple arc-shaped protruding rings are vertically arranged on the surface of the plastic column, and the arc-shaped protruding rings are connected to each other by arc-shaped concave rings.

[0005] Furthermore, a connecting frame is vertically arranged in the middle of the backrest unit frame, and the connecting frame is connected to the connecting frame.

[0006] Furthermore, the connecting frame is symmetrically provided with two or more first mounting seats, and the backrest unit frame of the backrest unit group is provided with second mounting seats corresponding to the first mounting seats one by one. The first mounting seats and the second mounting seats are connected by elastic elements.

[0007] Furthermore, the elastic element includes two or more springs arranged in an array.

[0008] Furthermore, each spring extends to form a retaining ring at the end on the same side, and the retaining rings are stacked and fixedly mounted on the first mounting base or the second mounting base by retaining screws passing through them.

[0009] Alternatively, each spring extends to form a retaining ring at both ends. Each retaining ring on each side is stacked and fitted with a retaining screw. The retaining rings on one side are fixedly mounted on the first mounting base by the retaining screws, while the retaining rings on the other side are fixedly mounted on the second mounting base by the retaining screws.

[0010] Furthermore, the interior of the plastic column is provided with a soft rubber sheet or elastic sheet integrally injection molded with the plastic column along the connection direction of the backrest unit.

[0011] Furthermore, the cross-section of the soft rubber sheet or elastic sheet is in the shape of a straight line, an I-shape, or a C-shape, with its middle portion arranged along the connection direction of the backrest unit and its two ends located within the frame of the backrest unit.

[0012] The seat described in this utility model has the backrest unit connection structure described above, and has all the beneficial effects of the backrest unit connection structure of this utility model.

[0013] The backrest unit connection structure connects adjacent backrest units via plastic pillars with multiple arc-shaped convex and concave rings spaced apart on their surfaces. The plastic pillars form a wave-like alternating concave and convex structure. When the plastic pillar deforms to one side due to compression, the arc-shaped convex rings on one side tend to retract inward toward the center of the plastic pillar, while the arc-shaped convex rings on the opposite side tend to expand outward toward both ends of the plastic pillar. The arc-shaped concave rings undergo a certain elastic deformation under the compression of the arc-shaped convex rings on both sides, thereby forming sufficient deformation space and making it easy for the plastic pillar to undergo elastic deformation. When the above structure is applied to a chair back, as a chair back, when the user sits on the chair and leans back against the backrest, each backrest unit in the backrest unit group swings towards the connecting frame due to pressure. The plastic column undergoes elastic deformation under compression, causing the backrest units connected to its two ends to retract inward with the user's waist and back. This allows the backrest units to conform to the user's waist and back, providing corresponding support to distribute the force and prevent damage from excessive pressure. When the user changes their sitting posture, the compressed backrest unit can pull other backrest units through the plastic column, allowing each backrest unit to elastically open outward or retract inward according to the user's changing sitting posture, maintaining a close fit to the user's back. This ensures that the user's waist and back can receive more comfortable support in different sitting postures, guaranteeing a high level of comfort. The backrest unit connection structure of this utility model has a simple structure and can better fit the user's waist and back posture, providing a more stable and flexible support effect and improving the user's comfort. Moreover, the plastic column and the backrest unit are integrally molded and connected, eliminating the need for additional installation structures, saving installation process and making it convenient to use. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the backrest unit connection structure according to one embodiment.

[0015] Figure 2 This is a schematic diagram of the backrest unit connection structure from another angle, according to one embodiment.

[0016] Figure 3 for Figure 2 A partially enlarged structural diagram of the plastic column.

[0017] Figure 4 for Figure 2 A cross-sectional view of the plastic column along the AA direction.

[0018] Figure 5 This is a schematic diagram of the backrest unit connection structure in its natural state.

[0019] Figure 6 for Figure 5 A magnified schematic diagram of part B in the middle section.

[0020] Figure 7 This is a schematic diagram of the backrest unit connection structure under pressure.

[0021] Figure 8 for Figure 7 A magnified schematic diagram of a portion of the C section.

[0022] Figure 9 This is a schematic diagram of the backrest unit connection structure under another state of pressure.

[0023] Figure 10 for Figure 9 A magnified schematic diagram of a portion of the structure in section D.

[0024] Figure 11 This is a schematic diagram of another structure for the backrest unit connection.

[0025] Figure 12 This is another structural diagram of the backrest unit connection structure.

[0026] Figure 13 for Figure 12 A structural diagram from another angle.

[0027] Figure 14 This is a structural schematic diagram of the first mounting base and the elastic element.

[0028] Figure 15 An exploded view of a structure consisting of two mounting bases and an elastic element.

[0029] Figure 16 This is an exploded view of another structure for the two mounting bases and the elastic element.

[0030] Figure 17 This is another structural diagram of the backrest unit connection structure.

[0031] Figure 18 for Figure 17 A structural diagram from another angle.

[0032] Figure 19 This is another structural diagram of the backrest unit connection structure.

[0033] Figure 20 , 21 This is an exploded view of the two mounting bases and other structures of the elastic element.

[0034] Figure 22 This is a schematic diagram of the overall structure of a seat with a backrest unit connection structure.

[0035] The markings in the diagram are: 1-connecting frame; 11-first mounting base; 2-backrest unit; 21-connecting frame strip; 22-second mounting base; 3-plastic column; 31-arc-shaped convex ring; 32-arc-shaped concave ring; 33-soft rubber sheet or elastic sheet; 4-spring; 41-fixing ring; 42-fixing screw; 43-screw hole; 44-fixing hole; 45-annular groove; 46-fixing nut; 47-protrusion; 48-cover plate; 201-lumbar pillow backrest unit; 202-back pillow backrest unit. Detailed Implementation

[0036] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0037] It should be noted that if any directional indication (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial, etc.) is involved in the embodiments of this utility model, the directional indication is only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0038] If the embodiments of this utility model involve descriptions such as "first" or "second," such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. In the description of this utility model, "several" means one or more, "multiple" means two or more, and "above," "below," and "within" are all understood to include the stated number. Furthermore, the technical features of each embodiment can be arbitrarily combined. For the sake of brevity, not all possible combinations of the technical features in the embodiments are described; however, as long as these combinations of technical features do not contradict each other, they should be considered within the scope of this specification.

[0039] This utility model proposes a backrest unit connection structure.

[0040] like Figure 1As shown in Figure 10, the backrest unit connection structure of this embodiment includes a connecting frame 1 connected to the seat and a backrest unit group installed on the connecting frame 1. The backrest unit group includes two or more backrest units 2 arranged side by side. Adjacent backrest units 2 are connected by plastic columns 3 that are integrally formed with the backrest unit frame at both ends. Multiple arc-shaped protruding rings 31 are vertically arranged on the surface of the plastic column 3, and each arc-shaped protruding ring 31 is connected to the other by arc-shaped concave rings 32.

[0041] Adjacent backrest units 2 are connected by plastic posts 3, such as Figure 3 As shown, by arranging multiple vertical arc-shaped protruding rings 31 at intervals on the surface of the plastic column 3, and setting arc-shaped concave rings 32 between each arc-shaped protruding ring 31, a wave-like alternating concave-convex structure is formed. In the above structure, the setting of the arc-shaped concave rings 32 provides more deformation space between each arc-shaped protruding ring 31, making the plastic column 3 perform better when deformed. Figure 5 , Figure 6 When the backrest unit connection structure is in its natural, uncompressed state, the arc-shaped protruding rings 31 and concave rings 32 on the plastic column 3 are in their initial form. When the plastic column 3 deforms to one side due to compression, please refer to... Figures 7 to 10 The arc-shaped protruding rings 31 on one side of the plastic column 3 tend to shrink inward toward the center of the plastic column 3, while the arc-shaped protruding rings 31 on the opposite side tend to expand outward toward both ends of the plastic column 3. The arc-shaped concave rings 32 undergo elastic deformation under the compression of the arc-shaped protruding rings 31 on both sides, thereby forming sufficient deformation space, making the plastic column 3 easy to undergo elastic deformation.

[0042] It is understood that the number, thickness, and density of the arc-shaped convex rings 31 and arc-shaped concave rings 32 on the plastic column 3 are not limited to the examples given in the attached drawings. They can be set according to actual needs. By setting different numbers, thicknesses, and densities, different deformation forces and deformation ranges of the backrest unit can be achieved to adapt to different usage requirements. In addition, the arc-shaped convex rings 31 and arc-shaped concave rings 32 on the plastic column 3 can be set to a uniform density or a non-uniform density. For example, the density of the arc-shaped convex rings 31 and arc-shaped concave rings 32 on the plastic column 3 can be set to be sparser in the middle and denser on both sides, or denser in the middle and sparser on both sides. The height difference between each adjacent arc-shaped convex ring 31 and arc-shaped concave ring 32 on the plastic column 3 can be the same, or different height differences can be set at different positions. For example, a larger height difference between the convex and concave rings can be set in the middle of the plastic column 3, and a smaller height difference can be set on both sides, or a smaller height difference can be set in the middle and a larger height difference can be set on both sides. In the above-mentioned settings for density and height difference, a denser convex and concave ring or a smaller height difference between the convex and concave rings makes it more difficult for the plastic column 3 to deform, while a sparser convex and concave ring or a larger height difference between the convex and concave rings makes the plastic column 3 more easily deformed. Therefore, by matching different densities and height differences of the convex and concave rings at different positions of the plastic column 3, the deformation force and deformation range of the backrest unit 2 connected to it can be further controlled, thereby meeting more different support requirements.

[0043] The backrest unit 2 can be a lumbar support, backrest, or shoulder pillow. When applied to a chair as a backrest for leaning, the aforementioned backrest unit connection structure can be individually installed in the area corresponding to the lumbar support, backrest, or shoulder pillow on the chair back, or it can be arbitrarily combined or simultaneously installed in the aforementioned areas, so that the lumbar support, backrest, or shoulder pillow area equipped with the backrest unit connection structure has the corresponding beneficial effects of this utility model. In each backrest unit group, the backrest unit 2 can be configured as follows: Figure 1 The backrest units 2 are arranged horizontally side-by-side, with adjacent left and right backrest units 2 connected by the plastic pillars 3 described in this invention. Alternatively, they can be arranged vertically side-by-side (not shown in the figure), where adjacent vertical backrest units 2 are connected by the plastic pillars 3. The number of backrest units 2 arranged side-by-side can be set as follows: Figure 1 , Figure 11 The two shown in —13 can also be set as follows Figure 17 The three shown in —19 can also be set to more than three; when using multiple backrest units 2 arranged side by side, refer to Figure 17As shown, adjacent backrest units 2 are connected using the plastic pillars 3 described in this invention. Alternatively, only a portion of adjacent backrest units 2 can be connected using the plastic pillars 3, while the remaining backrest units 2 can be connected using existing connection methods. It is understood that the side-by-side connection method and number of backrest units 2 are not limited to the above example; they can be set or adjusted according to actual needs to adapt to different usage scenarios, and will not be elaborated upon here.

[0044] When the user leans against the aforementioned backrest unit 2, such as Figure 7 The backrest unit 2 swings towards the connecting frame 1 under pressure. The plastic column 3 undergoes elastic deformation under compression, causing the backrest units 2 connected to both ends to retract inwards with the user's waist and / or back. This ensures that the backrest units 2 conform to the user's waist and / or back, providing appropriate support to distribute the force and prevent damage from excessive pressure. When the user's posture changes, such as due to stretching or other movements causing excessive unilateral tilting, refer to... Figure 9 As shown, the pressed backrest unit 2 can pull other backrest units 2 through the plastic pillar 3, so that each backrest unit 2 can elastically open outward according to the user's unilateral tilt position, ensuring that the backrest unit 2 on that unilateral position can fit against the human back; when the user continues to press backward, then refer to Figure 7 As shown, the pressed backrest unit 2 pulls other backrest units 2 through the plastic pillar 3, allowing each backrest unit 2 to continue to tighten inward as the user continues to press backward. Through this operation, each backrest unit 2 can elastically change according to the user's ever-changing sitting posture to maintain a close fit to the user's back, allowing the user's waist and / or back to receive more comfortable support in different sitting positions, ensuring the comfort level of the chair. Therefore, the backrest unit connection structure of this utility model is simple in structure, can better fit the user's waist and / or back, provides the user with a more stable and flexible support effect, improves the comfort of use, and its plastic pillar 3 is integrally formed with the backrest unit 2, eliminating the need for additional installation structures, saving installation process, and making it convenient to use.

[0045] The installation of the connecting bracket 1 and the backrest unit assembly can be as follows: Figure 1 As shown, the two ends of the connecting frame 1 are respectively connected to the backrest unit frames on both sides of the backrest unit group. This allows the backrest units 2 on both sides of the backrest unit group to have sufficient swing angle to open outward or retract inward when compressed or pulled by the plastic column 3, maintaining a close fit to the user's waist and back to ensure comfort. Alternatively, a connecting frame strip 21 can be vertically installed in the middle of the backrest unit frame, connecting the connecting frame 1 to the connecting frame strip 21. The connection position can be set as needed; see reference [reference needed]. Figure 11As shown, connecting frame strips 21 are vertically installed in the middle of the backrest unit frames on both sides of the backrest unit group, so that the two ends of the connecting frame 1 are connected to the connecting frame strips 21 on both sides of the backrest unit group respectively. The setting of the connecting frame strips 21 can make the backrest unit frame structure on both sides more stable and ensure a better connection effect between the connecting frame and the backrest unit group.

[0046] The connection between the aforementioned connecting frame and the backrest unit can be integral, fixed, detachable, or connected through an elastic mechanism, which can provide a certain cushioning effect, allowing the backrest unit to more comfortably support the user's waist and back.

[0047] In other embodiments, such as Figure 12 As shown in Figure 21, the connecting frame 1 has two or more first mounting seats 11 symmetrically arranged. The backrest unit frame of the backrest unit group has second mounting seats 22 corresponding to the first mounting seats 11. The first mounting seats 11 and the second mounting seats 22 are connected by elastic members. The first mounting seats 11 can be located at both ends of the connecting frame 1, and the second mounting seats 22 can be correspondingly located on the backrest unit frames on both sides of the backrest unit group or on the connecting frame strip 21 in the middle of the frame. Of course, the number and position of the first and second mounting seats are not limited to the example shown in the figure, and will not be specifically described here.

[0048] With the above structure, the elastic element can deform accordingly depending on the pressure applied to the backrest unit group. When the user presses on the backrest unit 2, the second mounting seat 22 on the frame moves towards the corresponding first mounting seat 11, causing the elastic element to contract under pressure. The elastic force provided by the elastic element forms a more effective cushioning, which better prevents damage to bones and muscles caused by excessive movement when the user leans against the chair back. When the user leaves or the force of leaning back decreases, the elastic element pushes the second mounting seat 22 away from the first mounting seat 11 through its elastic force, so that the corresponding backrest unit returns to its original position, or pushes the backrest unit to fit tightly against the user's waist and back. Furthermore, in conjunction with the backrest unit connection structure, it can further increase the swing angle range of the backrest units 2 on both sides, so that when the backrest unit group is under pressure, the adjustable range of each backrest unit 2 towards the connecting frame 1 can be increased, thereby providing better support for the user and allowing the user's waist and back to get more comfortable support in different sitting postures. Its applicability is wider, further improving the comfort of the chair.

[0049] The elastic element can be any type of spring, and can be set according to actual needs. The number of elastic elements can be one, two, or more. The above-mentioned elastic elements can be directly welded to the mounting base, or connected to the metal plate (such as iron plate, steel plate, etc.) of the mounting base, or fixed to the mounting base by screws or bolts. Alternatively, a locator for fixing the end of the elastic element can be set in the mounting base. The locator can be a positioning post for the spring to be fitted into, an annular groove for the end of the spring to be inserted, or other existing common spring fixing structures.

[0050] The elastic element includes two or more springs 4 arranged in an array, all springs 4 are arranged in the same direction, and the shape of each mounting base is adapted to the array arrangement of the springs 4. The array arrangement of the springs 4 can be symmetrically arranged side by side vertically, horizontally, or arranged in other directions, such as... Figure 13 , Figure 18 As shown, two springs 4 are arranged side by side, one above the other, or as... Figure 19 As shown, three springs 4 are arranged side by side, one above the other. When there are three or more springs 4, they can also be arranged in other array patterns, as shown in the reference. Figure 20 This can be achieved by having three or more springs 4 arranged in a circular pattern around the screw holes 43 on the mounting base, or by arranging multiple springs 4 at a certain angle. With the above structure, the springs 4 can cooperate to withstand a greater load and provide more elastic force, making the movement of the corresponding backrest unit 2 more stable under pressure, and improving the back pressure and support effect.

[0051] Furthermore, in some embodiments, such as Figure 14 , Figure 15 , Figure 20 As shown, each spring 4 extends to form a retaining ring 41 at the same end on the same side. These retaining rings 41 are stacked and fixed to the first mounting base 11 or the second mounting base 22 by retaining screws 42 passing through them. The retaining screws 42 can be bolts, screws, etc., and their fixing method to the mounting base can be referred to... Figure 16 As shown, screw holes 43 are directly provided on the mounting base, and the positions of the retaining rings 41 correspond to the positions of the screw holes 43. The fixing screws 42 pass through the retaining rings 41 of each spring 4 and are threaded into the screw holes 43, thus completely fixing each retaining ring 41. This allows the spring 4 to be removed by loosening the fixing screws 42 when needed. Alternatively, refer to... Figure 15As shown, a fixing hole 44 is provided on the mounting base, and a fixing nut 46 is also provided on the fixing screw 42 for threaded connection. The two are combined and pass through the fixing ring 41 and installed in the fixing hole 44, thereby completely fixing each fixing ring 41. Alternatively, a self-tapping screw can be used as the fixing screw 42, which can directly nail each fixing ring 41 to the mounting base. With the above structure, the fixing ring 41 provided on one side of each spring 4 is fixed to the first or second mounting base by fixing screw 42. Compared with the traditional fixing structure, its structure is simple, reduces the number of parts used when installing each spring, makes installation and disassembly more convenient, and ensures a better fixing effect.

[0052] In the above structure, the fixing method of the other end of each spring 4 that does not have a fixing ring 41 can be referred to Figure 15 As shown, a small loop is formed around the end of the spring 4 on this side, allowing the threaded portion of the fixing screw 42 to pass through while preventing the screw head of the fixing screw 42 from passing through. A screw hole 43 corresponding to each spring 4 is provided on the second mounting base 22, allowing the fixing screw 42 to be threaded into the screw hole 43, thus fixing this end of the spring 4 to the second mounting base 22 for easy assembly and disassembly. An annular groove 45, adapted to the size of the spring 4, can also be provided near the screw hole 43 of the second mounting base 22, allowing the spring 4 to be fitted into the annular groove 45. The annular groove 45 provides a limiting and blocking effect on the end of the spring 4, making it easier to place the spring 4 in the corresponding screw hole 43 on the second mounting base 22 during installation, and improving both the fixing and aesthetics. Obviously, in some other embodiments, if the other end of the fixing ring 41 is not provided on the first mounting base, the end of the spring 4 on this side can also be fixed to the first mounting base in the same manner as described above. Of course, the end of the spring 4 can also be directly welded to the mounting base or to a metal sheet (such as an iron sheet or a steel sheet), and then mounted on the mounting base by the metal sheet, or other existing common fixing methods can be used to fix the end of the spring to the mounting base.

[0053] In other embodiments, such as Figure 16 As shown, each spring 4 extends to form a fixing ring 41 on both ends. Each fixing ring 41 on each side is stacked and fitted with a fixing screw 42. The fixing ring 41 on one side is fixedly mounted on the first mounting base 11 by the fixing screw 42, and the fixing ring 41 on the other side is fixedly mounted on the second mounting base 22 by the fixing screw 42. Thus, both ends of each spring 4 can be fixedly mounted on the first mounting base 11 and the second mounting base 22 respectively by the fixing ring 41 and fixing screw 42 on the corresponding side. Both ends adopt the above-mentioned fixing structure that is easy to install and remove, which can further simplify the components required for installation and make the installation and removal of each spring 4 more convenient.

[0054] Furthermore, in some other embodiments, when the number of springs 4 is three or more, the fixing method of each fixing ring 41 formed by the extension of the end of each spring can be as follows: Figure 20 As shown, the retaining rings 41 on each side end of the three or more springs 4 are stacked and fixed by retaining screws 42; you can also refer to Figure 21 As shown, the two ends of each spring 4 are connected sequentially, and the fixing rings 41 on the two connected ends are stacked and fixed by fixing screws 42.

[0055] In some embodiments, the connection between the elastic member and the first mounting base 11 or the second mounting base 22 can be as follows: Figure 16 As shown, a flat contact surface is set; alternatively, as shown... Figure 20 , Figure 21 As shown, a protrusion 47 or a recess (not shown in the figure) is provided at the connection between the spring and the first mounting base 11 or the second mounting base 22, so that the mounting base forms a partial protrusion or a partial recess. This avoids the situation where the lengths of the springs in their natural state are not corresponding due to the stacking of the fixing rings 41 formed by the extension of multiple spring ends, and the compression degree of each spring between the two mounting bases is inconsistent, thus affecting the uniformity of force distribution. Of course, the lengths of each spring can also be made to correspond by reducing or increasing the number of spring windings, thereby achieving uniform force distribution. In addition, in some embodiments, refer to Figure 21 As shown, a fixing hole 44 is provided on the mounting base to facilitate screws passing through the fixing hole 44 and screwing into the screw hole on another mounting base, making the spring installation more convenient. To ensure aesthetics, a removable cover plate 48 can be provided on the mounting base. After the spring is installed, the cover plate is installed on the mounting base to cover the fixing holes 44 or screw holes.

[0056] In some embodiments, such as Figure 5 , Figure 6 The plastic column 3 bends towards the connecting frame 1, so that the plastic column 3 forms an arched structure towards the connecting frame 1 in its natural state. This allows each backrest unit 2 in the backrest unit group to have a certain inward effect in its natural state. The user can get a better wrapping and fit of each backrest unit 2 from the beginning of leaning against it. Under this structure, the plastic column 3 can more easily undergo elastic deformation towards the backrest of the chair. When the user's back presses backward against the backrest unit 2, the process of the plastic column 3 undergoing elastic deformation backward is smoother, which makes it easier for it to drive each backrest unit 2 to better fit the waist and back, and improve the user's leaning comfort.

[0057] The interior of the plastic column 3 can be made entirely of one-piece molded plastic. In some embodiments, it can also be as follows: Figure 4As shown, a soft rubber sheet or elastic sheet 33, integrally injection molded with the plastic column 3, is provided inside the plastic column 3 along the connection direction of the backrest unit 2. The soft rubber sheet can be a lightweight plastic such as PP or PE with relatively low surface hardness, while the elastic sheet can be a manganese steel sheet or other metals, plastics, or rubbers with elastic properties. In this structure, the soft rubber sheet or elastic sheet 33 is integrally injection molded with the plastic column 3, providing a certain degree of elasticity to the plastic column 3, further enhancing its adaptive deformation and rebound function, as well as its internal structural strength. This ensures that the backrest unit 2 conforms to the user's back during use, providing more elastic support for the user's waist or back. It offers better cushioning while allowing for easy adjustment, improving comfort. When the seat is not in use, the plastic column 3 can help the backrest unit 2 return to its natural state more quickly.

[0058] The cross-section of the soft rubber sheet or elastic sheet 33 can be I-shaped, or it can be as follows: Figure 4 The backrest unit 2 is arranged in an I-shape or C-shape (not shown), with its middle part set along the connection direction of the backrest unit 2 and its two ends located in the backrest unit frame. This is to further enhance the structural strength of the soft rubber sheet or elastic sheet in the plastic column 3, reduce the risk of breakage of the plastic column 3, and make the connection between the plastic column 3 and the backrest unit 2 at both ends more stable.

[0059] In some embodiments, the connecting frame 1 is elastic, giving it adaptive deformation and rebound functions. In conjunction with the backrest unit assembly, the connecting frame 1 can also undergo a certain deformation when the backrest unit assembly is compressed, providing elastic support to the connected backrest unit 2 to provide a certain amount of cushioning, thereby improving the user's comfort.

[0060] This utility model also provides a seat having the aforementioned backrest unit connection structure, and possessing all the beneficial effects of the backrest unit connection structure of this utility model. The aforementioned backrest unit connection structure can be individually installed in the portion of the seat corresponding to the lumbar support, backrest, or shoulder rest, or it can be arbitrarily combined or simultaneously installed in the aforementioned portions to achieve the corresponding beneficial effects.

[0061] In some embodiments, such as Figure 22As shown, two rows of backrest units are installed on the seat as its backrest. Each backrest unit group contains a lumbar support backrest unit 201 corresponding to the lumbar support and a backrest backrest unit 202 corresponding to the backrest. When a user sits on the seat and leans back against the backrest, the lumbar support backrest unit 201 and / or the backrest backrest unit 202 swing towards the connecting frame 1 due to pressure. The plastic column 3 undergoes elastic deformation under compression, causing the lumbar support backrest unit 201 and / or the backrest backrest unit 202 connected at both ends to retract inwards with the user's waist and / or back, allowing the lumbar support backrest unit 201 and / or the backrest backrest unit 202 to conform to the user's waist and / or back, providing corresponding support to distribute pressure. To prevent damage from excessive pressure, when the user's sitting posture changes, such as when the waist and / or back tilts too much to one side, the compressed lumbar support unit 201 and / or back support unit 202 can pull other backrest units in the same group through the plastic pillar 3. This allows each backrest unit to elastically open outward or tighten inward according to the user's changing sitting posture, so as to keep it in close contact with the waist and / or back of the human body, allowing the user's waist and / or back to get more comfortable support in different sitting postures, and ensuring the comfort level of the seat.

[0062] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A backrest unit connection structure, characterized in that: The application relates to a seat backrest unit connecting structure, which comprises a connecting frame (1) connected with a seat and a backrest unit group installed on the connecting frame (1), wherein the backrest unit group comprises two or more backrest units (2) arranged side by side, adjacent backrest units (2) are connected through plastic columns (3) integrally formed at both ends of a backrest unit frame body, and a plurality of arc-shaped convex rings (31) are vertically arranged on the surface of the plastic column (3), and the arc-shaped convex rings (31) are connected through arc-shaped concave rings (32).

2. The backrest unit connection structure according to claim 1, characterized in that: A connecting frame strip (21) is vertically arranged at the middle part of the backrest unit frame body, and the connecting frame (1) is connected with the connecting frame strip (21).

3. The backrest unit connection structure according to claim 1, characterized in that: Two or more first mounting seats (11) are symmetrically arranged on the connecting frame (1), and second mounting seats (22) corresponding to the first mounting seats (11) are arranged on the backrest unit frame body of the backrest unit group, and the first mounting seats (11) and the second mounting seats (22) are connected through elastic members.

4. The backrest unit connection structure according to claim 3, characterized in that: The elastic members comprise two or more array-arranged springs (4).

5. The backrest unit connection structure according to claim 4, characterized in that: Each spring (4) extends to form a fixing ring (41) at the end on the same side, and each fixing ring (41) is stacked and fixedly installed on the first mounting seat (11) or the second mounting seat (22) through a fixing screw (42) penetrating the fixing ring (41).

6. The backrest unit connection structure according to claim 4, characterized in that: Each spring (4) extends to form a fixing ring (41) at the end on the same side, and each fixing ring (41) is stacked and fixedly installed on the first mounting seat (11) or the second mounting seat (22) through a fixing screw (42) penetrating the fixing ring (41).

7. Backrest unit connection structure according to any of claims 1-6, characterized in that: A soft rubber sheet or elastic sheet (33) integrally formed with the plastic column (3) is arranged in the plastic column (3) along the connecting direction of the backrest unit.

8. The backrest unit connection structure according to claim 7, characterized in that: The soft rubber sheet or elastic sheet (33) has a cross section in the shape of a Chinese character, an English character H or a Chinese character C, wherein the middle part is arranged along the connecting direction of the backrest unit, and the two ends are arranged in the backrest unit frame body.

9. A seat, characterized by The seat is provided with the backrest unit connecting structure according to any one of claims 1-8.

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