Detachable chair back unit supporting structure and chair back

Abstract

The utility model discloses a detachable chair back unit support structure and a chair back, which comprise a clamping device connected with the chair back, and a rotatable hinge ball for the chair back unit to pass through is clamped at the clamping end of the clamping device. The rotatable hinge ball is clamped by the clamping device, multi-angle free adjustment of the chair back unit can be realized, a user can flexibly adjust the angle and the position of the chair back unit according to personal sitting posture habits and comfort, an attached supporting effect and comfortable sitting feeling are obtained, and the practicability and humanized design of the chair are remarkably improved. Meanwhile, the chair back unit is simple and quick to mount, dismount and replace, and complicated tools or tedious operations are not needed. A user can quickly replace the chair back units with different styles or functions to enhance the customizability and adaptability of the chair, and the damaged, worn-out or dirty chair back units can be conveniently maintained, replaced and cleaned to ensure that the chair is always kept in a comfortable, clean and tidy good state.

Description

Technical Field

[0001] This utility model relates to a support device for the backrest unit of a seat, specifically a detachable backrest unit support structure and a seat back. Background Technology

[0002] Chairs are widely used and frequently employed in our lives and work. Their basic structure generally includes a backrest unit, which contacts the waist, back, shoulders, neck, or head, providing support. People often lean against the backrest unit to relieve fatigue in these areas while working or resting. Existing backrest units are generally fixed; even those that are partially adjustable often have limited adjustment options and ranges, and are not easy to operate. Furthermore, because the backrest unit is usually directly connected to the backrest support frame or other mechanisms, repairs often require sending the entire backrest back for repair. This not only incurs high shipping costs but also increases the risk of damage during transit. Additionally, since the backrest unit is frequently in contact with clothing, it is prone to staining if not replaced or cleaned regularly. This results in the chair back not only being unable to adapt well to various postures during rest or work due to its non-adjustable or limited adjustable functions, thus failing to provide a comfortable sitting experience and reducing the quality of rest and work efficiency, but also being difficult to repair or replace after long-term and frequent use due to damage to the chair back unit. Furthermore, it is difficult to replace or clean the chair back unit after it becomes dirty, resulting in the chair back remaining in a worn-out state for a long time, further reducing the user experience of the chair. Utility Model Content

[0003] This utility model provides a detachable backrest unit support structure and backrest that is easy to assemble and disassemble, has a freely adjustable backrest unit, and is simple in structure and easy to operate.

[0004] The detachable chair back unit support structure of this utility model includes a clamping device connected to the chair back, and the clamping end of the clamping device clamps a rotatable hinge ball and a hinge ball for the chair back unit to pass through for installation.

[0005] The detachable backrest unit support structure uses a clamping device to hold a rotatable hinge ball, allowing the backrest unit to be freely adjusted at multiple angles. Users can flexibly adjust the angle and position of the backrest unit according to their personal sitting habits and comfort to obtain a close-fitting support effect and a comfortable sitting feel, significantly improving the practicality of the chair and meeting the needs of humanized design. At the same time, the installation of the backrest unit relies on the clamping device holding the hinge ball, and the disassembly, installation, and replacement processes are simple and quick, without complicated tools or cumbersome operations. Users can not only quickly replace backrest units of different styles or functions, thereby enhancing the customizability and adaptability of the chair to meet diverse needs, but also easily maintain damaged backrest units, and replace and clean worn and dirty backrest units, thus keeping the chair in a good condition that provides a comfortable sitting feel and looks clean and tidy.

[0006] As a preferred embodiment of the present invention, the clamping end of the clamping device is provided with a spherical recess that is adapted to the hinge ball.

[0007] As a preferred embodiment of this utility model, a plurality of spherical recesses are provided at the clamping end of the clamping device.

[0008] As a preferred embodiment of the present invention, the clamping device includes two jaws that can open or clamp relative to each other. The front end of the jaws is provided with a spherical recess that is adapted to the hinge ball. The middle part of the jaws is provided with a hinge seat and is hinged by a hinge shaft. The rear end of the jaws is compressed with a first elastic element to provide clamping force to the front end of the jaws. The rear end of the jaws is provided with a mounting groove for installing the first elastic element.

[0009] As a preferred embodiment of this utility model, a pressing mechanism that can change the clamping force is provided at the rear end of the gripper.

[0010] As a preferred embodiment of the present invention, the pressing mechanism includes a nut pad installed on the side of one of the grippers, and a screw threaded through the nut pad. A top block is provided between the nut pad and the first elastic member, and the top block can compress the first elastic member relative to it. The end of the screw abuts against the top block.

[0011] As a preferred embodiment of this utility model, the top block is provided with a snap groove, and the end of the screw is provided with a snap block, which snaps into the snap groove.

[0012] As a preferred embodiment of this utility model, a column for limiting is provided in the mounting groove, and a first elastic element is sleeved on the column.

[0013] As a preferred embodiment of this utility model, a connecting plate connected to the backrest support frame is provided at the rear end of one of the grippers.

[0014] As a preferred embodiment of this utility model, the articulated ball comprises two detachable hemispheres.

[0015] As a preferred embodiment of this utility model, a positioning post is provided on the mating surface of one hemisphere, while a corresponding positioning hole is provided on the mating surface of the other hemisphere.

[0016] As a preferred embodiment of this utility model, it also includes a chair back unit connected to the hinge ball. The chair back unit includes a connecting rod that passes horizontally through the hinge ball. Several limiting grooves are provided horizontally and laterally on the connecting rod. A limiter that elastically abuts against the limiting groove is installed inside the hinge ball.

[0017] As a preferred embodiment of this utility model, it also includes a chair back unit connected to the hinge ball. The chair back unit includes a connecting rod that passes vertically through the hinge ball. The connecting rod is provided with a plurality of limiting grooves at vertical intervals. A limiter that elastically abuts against the limiting groove is installed inside the hinge ball.

[0018] As a preferred embodiment of this utility model, the hinged ball is provided with a mounting groove for installing a limiter, and the limiter is elastically compressed with a second elastic element in the mounting groove, so that the end of the limiter abuts against the limiting groove.

[0019] The chair back of this utility model has the detachable chair back unit support structure and has all the beneficial effects of the detachable chair back unit support structure of this utility model. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the detachable chair back unit support structure in Embodiment 1.

[0021] Figure 2 This is an exploded view of the detachable chair back unit support structure of Embodiment 1.

[0022] Figure 3 This is a schematic diagram of a hinged ball structure.

[0023] Figure 4 This is a schematic diagram of the clamping device.

[0024] Figure 5 This is a schematic diagram of the gripper structure of the clamping device.

[0025] Figure 6 This is a schematic diagram of the detachable chair back unit support structure in Embodiment 2.

[0026] Figure 7 This is an exploded view of the detachable chair back unit support structure in Embodiment 2.

[0027] Figure 8 A schematic diagram of a structure with multiple spherical recesses for the clamping device.

[0028] Figure 9This is a schematic diagram of a detachable chair back unit support structure with a pressing mechanism.

[0029] Figure 10 Side view of the detachable chair back unit support structure with a pressing mechanism.

[0030] Figure 11 for Figure 10 Sectional view of AA.

[0031] Figure 12 This is a schematic diagram of another detachable chair back unit support structure with a pressing mechanism.

[0032] Figure 13 This is a schematic diagram of a structure that allows the clamping device to move in more directions.

[0033] Figure 14 This is a structural diagram of the frame connecting two chair back units as a detachable chair back unit support structure.

[0034] Figure 15 This is a structural diagram of the frame connecting three chair back units as a support structure for the detachable chair back unit.

[0035] Figure 16 A schematic diagram of a support structure for connecting one or more detachable backrest units to the backrest.

[0036] Figure 17 This is a schematic diagram illustrating the adjustable state of the backrest unit, which is a detachable backrest unit support structure.

[0037] Figure 18 This is a schematic diagram showing the rotational transformation state of the adjustable backrest unit, which is a detachable backrest unit support structure. Detailed Implementation

[0038] 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.

[0039] 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.

[0040] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0041] 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.

[0042] Example 1, as Figure 1-5 As shown, a detachable chair back unit support structure includes a clamping device 1 connected to the chair back. The clamping end of the clamping device holds a rotatable hinge ball 2 through which the chair back unit 3 is installed. By clamping the rotatable hinge ball with the clamping end of the clamping device, the chair back unit can be freely adjusted at multiple angles. Users can flexibly adjust the angle and position of the chair back unit according to their personal sitting habits and comfort to obtain various support effects and comfortable sitting feel, achieving a backrest-following effect, improving the practicality of the chair, and meeting the needs of humanized design. At the same time, the installation of the chair back unit relies on the clamping device holding the hinge ball, and the disassembly and replacement process is simple and quick, without complicated tools or cumbersome operations. Users can not only quickly replace chair back units of different styles or functions, but also quickly replace some chair back units with new functions for upgrades, thereby enhancing the customizability and adaptability of the chair to meet diverse needs. It also makes it easy to maintain damaged chair back units, replace and clean worn and dirty chair back units, so that the chair can be kept in a good condition that provides both comfortable sitting feel and a clean and tidy appearance.

[0043] The clamping end of the clamping device 1 is provided with a spherical recess 101 that is adapted to the articulated ball. The cooperation between the spherical recess and the articulated ball allows the articulated ball to rotate and swing at multiple angles within the recess. At the same time, it also allows the articulated ball to be tightly fitted within the recess during the clamping process, reducing slippage or displacement during the clamping process, thereby improving the stability of the clamping.

[0044] The clamping device 1 includes two jaws 102 that can open or clamp relative to each other. The front end of each jaw has a spherical recess 101 adapted to the hinge ball. The middle of each jaw has a hinge seat 103 and is hinged to a hinge shaft 104. The rear end of each jaw has a compressed first elastic element 4. The first elastic element 4 can be an elastic sheet, spring, leaf spring, torsion spring, tension spring, or any other element with elastic function; there are no restrictions here. It provides clamping force to the front end of the jaws. A mounting groove 105 for installing the first elastic element is provided at the rear end of the jaws. The first elastic element at the rear end of the jaws provides clamping force to the front end of the jaws. When the jaws clamp the hinge ball, the elastic force of the first elastic element causes the jaws to automatically clamp the hinge ball. If the backrest unit needs to be replaced, simply press the rear end of the jaws to squeeze the first elastic element, which will open the front end of the jaws relative to each other, thus removing the hinge ball. The operation is convenient and quick.

[0045] It is understandable that by changing the number of the first elastic elements 4, or by selecting first elastic elements with different spring coefficients, the clamping force can be changed, allowing the grippers to clamp the articulated ball more loosely or more tightly. This alters the force required for the rotation of the chair back unit. For example, it can make it more difficult to rotate to provide stronger support, or easier to rotate to facilitate better fit and support during body movement, thus meeting the user's needs for different support forces of the chair back unit. Furthermore, the end of the grippers can be provided with a limiting protrusion 107 following the shape of the articulated ball to prevent the articulated ball from easily detaching from the clamping device. Further, the middle part of the limiting protrusion, adapted to the arcuate surface of the articulated ball, can also have a downward-curved recess. Obviously, in some other embodiments, if the clamping force is already large, the end of the grippers can also be flat to facilitate easier assembly and disassembly of the articulated ball.

[0046] Furthermore, to prevent the first elastic element from being under compression and deformation for a long time, which may cause its position to shift, a column 106 for limiting is provided in the mounting groove 105. The first elastic element is sleeved on the column, thereby ensuring that the clamping device clamps the articulated ball more stably.

[0047] A connecting plate 5, which connects to the backrest support frame 11, is provided at the rear end of one of the grippers. For example... Figure 16 or Figure 17As shown, by directly setting a connecting plate at the rear end of the gripper, it can be detachably connected to the chair back support frame for easy maintenance, or it can be integrally connected to the chair back support frame to improve structural strength. This achieves a connection between the gripper and the chair back support frame without the need for additional connectors or complex connection methods. Its structure is simple, and the connecting plate can be adjusted according to different chair back support frame structures and requirements, connecting to different positions on different chair backs. This allows the clamping device to adapt to different types of chair back support frames, meeting the needs of different users.

[0048] The hinge ball 2 comprises two detachable hemispheres. Assembly of the hinge ball is completed simply by aligning and joining the two hemispheres together. This ease of assembly and disassembly significantly improves the convenience of assembly and replacement. For example, when adjusting or replacing the internal structure of the hinge ball, the two hemispheres can be easily disassembled; similarly, if the backrest unit needs to be replaced, the hinge ball can also be easily disassembled, simplifying the operation and enhancing flexibility and applicability. It is understood that mutually cooperating positioning posts and positioning holes can be provided on the mating surfaces of the two hemispheres. Specifically, a positioning post 203 is provided on the mating surface of one hemisphere, while a corresponding positioning hole 204 is provided on the mating surface of the other hemisphere, facilitating alignment and joining of the two hemispheres. In other embodiments, in addition to providing positioning posts and positioning holes, a protrusion can be provided on the outer surface of one hemisphere facing the mating surface of the other hemisphere, and a corresponding recessed block is provided on the outer surface of the other hemisphere at a corresponding position to facilitate positioning during alignment and joining.

[0049] Furthermore, the chair back unit 3 is connected to the articulated ball joint. The chair back unit 3 includes a connecting rod 301 that passes horizontally through the articulated ball joint. Several limiting grooves 302 are horizontally spaced on the connecting rod, and a limiter 201 that elastically abuts against the limiting grooves is installed inside the articulated ball joint 2. By horizontally spaced limiting grooves on the connecting rod, in conjunction with the limiter inside the articulated ball joint, the chair back unit can be positioned and fixed at different horizontal positions. Users can adjust the chair back unit to a suitable position according to their needs and comfort, enhancing the adjustability and personalized adaptability of the chair back unit. In addition, the chair back unit can move and be fixed horizontally relative to the articulated ball joint, allowing the chair back unit to simultaneously rotate and move horizontally. Therefore, when the user moves left or right, the chair back unit can move left or right and rotate accordingly in real time, always maintaining a close fit and support to the user's body, significantly improving the adjustability and personalized adaptability of the chair back unit.

[0050] Furthermore, the hinge ball 2 is provided with a mounting groove 202 for installing the limiter 201. The limiter elastically compresses the second elastic element 6 within the mounting groove, causing the end of the limiter to abut against the limiting groove. The elastic compression of the second elastic element within the mounting groove ensures that the end of the limiter can tightly abut against the limiting groove, providing stable support and fixation. Even when the backrest unit is subjected to external forces or frequent adjustments by the user, the engagement between the limiter and the limiting groove remains stable, preventing accidental movement or detachment of the backrest unit and improving the safety and reliability of the chair. Of course, in some embodiments, the contact surface between the limiter 201 or the mounting groove 202 and the second elastic element, or both the limiter 201 and the mounting groove and the second elastic element, can be flat or have recessed holes to limit the second elastic element, further enhancing the stability of the limiter.

[0051] It is understood that in other embodiments, the connection method of the articulated ball, connecting rod 301, and backrest unit is not limited to the above structure, and there are many alternative solutions. For example, the articulated ball can be integrally formed with the connecting rod 301, while the connecting rod is detachably connected to the backrest unit; or, the surface of the articulated ball can be detachably connected to the connecting rod through other installation structures such as screws or snap-fits, rather than being installed through the articulated ball. In this case, the connecting rod is integrally or detachably connected to the backrest unit; in addition, although the connecting rod passes through the articulated ball, a limiting groove and a limiting device may not be provided; or, the articulated ball may be integrally formed with only the backrest unit or integrally formed with both the connecting rod and the backrest unit.

[0052] In other embodiments, the backrest unit 3 can be composed of a single frame or two or more frames. When the backrest unit includes two frames that can move closer or further apart, each frame is provided with a connecting rod inserted into a hinge ball. Each connecting rod is provided with several limiting grooves 302 spaced apart, and a limiter 201 that elastically abuts against the limiting grooves 302 is installed inside the hinge ball 2. Therefore, when the backrest unit contains multiple frames, each frame is connected to the hinge ball through an independent connecting rod to adjust the spacing between the multiple frames of the backrest unit. The horizontally arranged connecting rods can adjust the width of the spacing, while the vertically arranged connecting rods can adjust the height of the spacing. Furthermore, extensions are provided on both sides of the hinge ball to increase the moving distance of the connecting rods and expand the spacing adjustment range. A limiting structure is provided at the end of each connecting rod that extends into the hinge ball to prevent the frame from being pulled open excessively, causing the connecting rod to slip out. This meets the needs of different body types and support requirements, improving comfort and personalized experience.

[0053] Example 2, as Figure 6 and Figure 7As shown, the difference from Embodiment 1 is that the backrest unit 3 includes a connecting rod 301 that passes vertically through the hinge ball. Several limiting grooves 302 are vertically spaced on the connecting rod, and a limiter 201 that elastically abuts against the limiting grooves is installed inside the hinge ball 2. This allows the backrest unit to be positioned and fixed in different vertical positions. Users can adjust the backrest unit to a suitable position according to their needs and comfort, enhancing the adjustment function and personalized adaptability of the backrest unit. For example, the height of the backrest unit can be adjusted according to the user's height, sitting habits, etc., to provide more comfortable support and a better user experience. Furthermore, in conjunction with the hinge ball, the backrest unit can rotate and rise / fall simultaneously, allowing it to further follow and conform to the user's body.

[0054] Example 3, as Figure 8 As shown in 8a and 8b, multiple spherical recesses 101 can also be provided at the clamping end of the clamping device, allowing the hinge ball to move flexibly and be positioned between adjacent spherical recesses 101, thereby realizing the adjustment of the backrest unit 3 for forward and backward movement and fixation. This not only allows for flexible adjustment according to the user's needs, such as adjusting the position of the backrest unit based on the user's body shape, sitting habits, etc., thus providing more comfortable support and a better user experience; but also, because it can drive the hinge ball to adjust forward and backward, the backrest unit can simultaneously rotate and move forward and backward. Therefore, even if the user's body moves forward and backward, the backrest unit can still move forward and backward and rotate, continuously conforming to the user's body, further improving the comfort and adaptability of use.

[0055] In embodiment four, a pressing mechanism 7 capable of changing the clamping force is provided at the rear end of the gripper. The pressing mechanism can be a combination structure of a locking block and a locking slot, or a combination structure of a worm gear and a turbine, or a structure of a screw and a pressing block, such as... Figure 9-12As shown, specifically, the pressing mechanism includes a nut pad 701 mounted on the side of one of the grippers, and a screw 702 screwed through the nut pad. A top block 703 is provided between the nut pad and the first elastic member 4, and the top block can relatively compress the first elastic member 4. The end of the screw abuts against the top block. Further, the top block has a locking groove 704, and the end of the screw has a locking block 705, which can be locked into the locking groove to enhance the stability of the structure. By rotating the screw, when the pressing block compresses the first elastic member 4, the elastic clamping force of the spring increases, and the front end of the gripper clamps more tightly; conversely, when the pressing block releases the first elastic member 4, the clamping force of the front end of the gripper on the hinge ball decreases, thereby realizing the adjustment of the tightness of the clamping device. This design can not only change the support force of the backrest unit, but also allow the user to easily install or remove the backrest unit by adjusting the initial position of the top block of the pressing mechanism. For example, adjusting the pressing mechanism can make the hinge ball loose enough for removal, or clamp it tightly to provide sufficient support. This method replaces the operation of pressing the back of the gripper by hand, saving the force required for operation and making the installation and disassembly process simpler.

[0056] In addition to the embodiments described above, the detachable chair back unit support structure of this utility model can also adopt other suitable structures.

[0057] In some embodiments, friction stripes or frosted surfaces, or other anti-slip structures that can increase friction can be provided between the contact surfaces of the hinge ball and the spherical recess, either individually or together, to make the backrest unit easier or more difficult to rotate by changing the friction between them, thereby adapting to different requirements for the support force of the backrest unit.

[0058] In some embodiments, the connecting plate 5 may be connected to a device that allows the clamping device to move and be fixed in the front-back direction, thereby increasing the fit and support range of the backrest unit in the front-back direction. In other embodiments, when the backrest unit 3 can be adjusted horizontally by moving and fixing within a hinge ball via a connecting rod, the connecting plate 5 may be connected to a device that allows the clamping device to move and be fixed vertically, thereby increasing the fit and support range of the backrest unit in the vertical direction. Similarly, when the backrest unit 3 can be adjusted vertically by moving and fixing within a hinge ball via a connecting rod, the connecting plate 5 may be connected to a horizontal adjustment device 10 that allows the clamping device to move and be fixed horizontally. Obviously, the above devices can be used individually or in combination, such as... Figure 13 13a and Figure 13 13b, for example Figure 13In section 13b, the connecting plate 5 can first connect to a front-to-back adjustment device 8 that moves and is fixed in the front-to-back direction. Then, the base plate of the front-to-back adjustment device 8 connects to the next adjustment device. For example, the front-to-back adjustment device 8 that moves and is fixed in the front-to-back direction can be further connected to a vertical adjustment device 9 that can move and be fixed in the vertical direction. Through the superposition and combination of these adjustment devices, the backrest unit can still move and rotate towards the user's backrest support to continue to follow and conform to the user's body, providing a comfortable and supportive fit, regardless of the user's body shape or changes in sitting posture.

[0059] Here are some examples of the structure of the chair back unit. In some embodiments, the chair back unit consists of a single, integral frame 303, such as... Figure 1 It can also consist of two or more frames, but the frames are separate, such as... Figure 14 It can also consist of two or more frames, but the frames are connected to each other, either wholly or partially, by connecting pieces. These connecting pieces can be elastic pieces, etc. In one embodiment, there are three frames connected to each other by elastic pieces 12, such as... Figure 15 Regardless of the user's need for different sizes or numbers of backrest units, this support structure allows for quick and easy replacement. Furthermore, backrest units are typically made of materials such as mesh, latex, foam, a mixture of foam and latex, PVC leather, air cushions, leather, or fabric to achieve comfortable support. Therefore, using this easily disassembled backrest support structure, users can replace the backrest unit with a breathable material like mesh in summer, or replace it with a warmer material like PVC leather covered in foam or latex in autumn and winter. This allows for cost-effective replacement of a single chair with a new chair of different materials, sizes, styles, or functions, meeting diverse user needs while being more economical, environmentally friendly, and extending the chair's lifespan.

[0060] In some embodiments, the backrest unit may be a lumbar support, and thus some embodiments are lumbar support with the detachable backrest unit support structure described herein; in other embodiments, the backrest unit may be a backrest, and corresponding embodiments are backrests with the detachable backrest unit support structure described herein; or if the backrest unit is a headrest, neck pillow, or shoulder pillow, corresponding embodiments are headrests, neck pillows, or shoulder pillows with the detachable backrest unit support structure described herein.

[0061] Examples of chair backs with detachable backrest unit support structures are listed below. In some embodiments, the chair back is composed of an entire chair back unit with a detachable backrest unit support structure, such as... Figure 1616a; In some other embodiments, the chair back may also be composed of multiple independent chair back units, which support different parts of the body respectively. The detachable chair back unit support structure can be applied individually to the independent chair back units in the different parts mentioned above. For example, the detachable chair back unit support structure can be separately incorporated into the lumbar support. Figure 16 16b can also have this detachable backrest unit support structure individually on any one of the backrest, shoulder pillow, neck pillow, or headrest units, or in any combination of multiple backrest units such as lumbar pillow, backrest, shoulder pillow, neck pillow, and headrest, such as having this backrest unit support structure on both the lumbar pillow and backrest; or it can also have this detachable backrest unit support structure on the lumbar pillow, backrest, shoulder pillow, and head / neck pillow simultaneously, such as... Figure 16 16c. Additionally, the chair back can have multiple backrest units supporting the same part of the body, and the detachable backrest unit support structure is simultaneously applied to these backrest units. For example, two backrest units support the lumbar region as a lumbar pillow, and two backrest units support the back as a backrest. Each backrest unit has this detachable backrest unit support structure, such as... Figure 16 The 16D design allows for independent adjustment and support of the left and right waist or back.

[0062] A chair back has the aforementioned detachable chair back unit support structure and possesses all the beneficial effects of the detachable chair back unit support structure of this utility model.

[0063] The following examples, using a lumbar pillow and backrest with the aforementioned detachable backrest unit support structure, illustrate some specific operations and usage methods (the specific operations and usage methods for shoulder pillows, neck pillows, or headrests with the aforementioned support structure are similar and will not be repeated). Figure 17 As shown, 17a is a chair back support frame, which forms a support frame by installing the backrest and lumbar support within the clamping device. Figure 17 The structure shown in b. Based on this, the lumbar support can move upwards and rotate upwards, while adjusting the left and right spacing to better adapt to and support the user's lower back, such as... Figure 17 c. When in use, the lumbar pillow can also be adjusted in tilt angle, rotate up and down, or swing left and right to follow the user's waist movements and provide a close-fitting support, such as... Figure 18 When the lumbar support or backrest is damaged, needs cleaning, or requires replacement or upgrading to a different function or style, it can be easily removed for maintenance or replacement, and then reinstalled using the clamping device – quick and convenient. Furthermore, these functional parts can be used individually or in combination to meet different support and usage needs.

[0064] The above description is merely a preferred embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the content of this specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model. In the description of this utility model, the terms "one embodiment," "some embodiments," "embodiment," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. Those skilled in the art will understand, explicitly and implicitly, that, without conflict, the embodiments described herein can be combined with other embodiments, and the embodiments of this utility model and the features within those embodiments can be combined with each other.

Claims

1. A detachable chair back unit support structure, characterized in that, Includes a clamping device (1) connected to the backrest, the clamping end of the clamping device clamping a rotatable articulated ball (2) for the backrest unit (3) to pass through the mounted articulated ball (2).

2. The detachable chair back unit support structure according to claim 1, characterized in that, The clamping end of the clamping device (1) is provided with a spherical recess (101) adapted to the hinge ball.

3. The detachable chair back unit support structure according to claim 2, characterized in that, Multiple spherical recesses (101) are provided at the clamping end of the clamping device.

4. The detachable chair back unit support structure according to claim 1, characterized in that, The clamping device (1) includes two jaws (102) that can open or clamp relative to each other. The front end of the jaws is provided with a spherical recess (101) that is adapted to the hinge ball. The middle part of the jaws is provided with a hinge seat (103) and is hinged by a hinge shaft (104). The rear end of the jaws is compressed with a first elastic element (4) to provide clamping force to the front end of the jaws. The rear end of the jaws is provided with a mounting groove (105) for installing the first elastic element.

5. The detachable chair back unit support structure according to claim 4, characterized in that, A pressing mechanism (7) that can change the clamping force is provided at the rear end of the gripper.

6. The detachable chair back unit support structure according to claim 5, characterized in that, The pressing mechanism includes a nut pad (701) mounted on the side of one of the grippers, and a screw (702) screwed through the nut pad. A top block (703) is provided between the nut pad and the first elastic member (4), which can compress the first elastic member (4) relative to the nut pad. The end of the screw abuts against the top block.

7. The detachable chair back unit support structure according to claim 6, characterized in that, The top block is provided with a snap-fit ​​groove (704), and the end of the screw is provided with a snap-fit ​​block (705), which snaps into the snap-fit ​​groove.

8. The detachable chair back unit support structure according to claim 4, characterized in that, The mounting groove (105) is provided with a column (106) for limiting the position, and the first elastic element is sleeved on the column.

9. The detachable chair back unit support structure according to claim 4, characterized in that, One of the grippers has a connecting plate (5) at its rear end that is connected to the backrest support frame (11).

10. The detachable chair back unit support structure according to any one of claims 1-9, characterized in that, The articulated ball (2) comprises two detachable hemispheres.

11. The detachable chair back unit support structure according to claim 10, characterized in that, One of the hemispheres has a positioning post (203) on its mating surface, while the other hemisphere has a corresponding positioning hole (204) on its mating surface.

12. The detachable chair back unit support structure according to claim 1, characterized in that, It also includes a backrest unit connected to the articulated ball. The backrest unit (3) includes a connecting rod (301) that passes horizontally through the articulated ball. Several limiting grooves (302) are provided horizontally and laterally on the connecting rod. A limiter (201) that elastically abuts against the limiting groove is installed inside the articulated ball (2).

13. The detachable chair back unit support structure according to claim 1, characterized in that, It also includes a backrest unit connected to the articulated ball. The backrest unit (3) includes a connecting rod (301) that passes vertically through the articulated ball. Several limiting grooves (302) are provided vertically at intervals on the connecting rod. A limiter (201) that elastically abuts against the limiting groove is installed inside the articulated ball (2).

14. The detachable chair back unit support structure according to claim 12 or 13, characterized in that, The articulated ball (2) is provided with a mounting groove (202) for installing a limiter (201). The limiter is elastically compressed with a second elastic element (6) in the mounting groove, so that the end of the limiter abuts against the limiting groove.

15. A chair back, characterized in that, The chair back has a detachable chair back unit support structure as described in any one of claims 1-14.

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