Chair back unit supporting structure and chair back

Abstract

The utility model discloses a chair back unit support structure and a chair back, which comprise a support plate connected with the chair back and a support frame connected with the support plate, the support frame is provided with a spherical pit, and a hinge ball which can rotate freely and is used for the chair back unit to pass through is embedded in the spherical pit. The bracket plate is tightly connected with the chair back, so that fixing and supporting effects are achieved, and the stability of the chair back is ensured. The supporting frame is connected with the support plate to form a stable structure, a spherical groove is formed in the supporting frame, and a hinge ball capable of rotating freely is embedded in the spherical groove. The chair back unit penetrates through the hinge ball to be installed and can flexibly rotate along with the hinge ball. When a user leans on the chair, the chair back unit can automatically rotate along with the movement of the waist, the back, the shoulders, the neck or the head, so that the effect of chasing the waist, the back, the shoulders, the neck or the head is achieved, all parts of the body are attached and supported, the requirements of different users are met, and the use comfort is improved.

Description

Technical Field

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

[0002] Chairs are widely used in people's daily lives and work. Their structure mainly includes a backrest unit that is set on the back of the chair and supports the waist, back, shoulders, neck, or head. When people work or rest, they often lean their waist, back, shoulders, neck, or head against the backrest unit. However, existing backrest units are generally fixed. Even if the angle of some backrest units can be adjusted independently, it usually requires manual adjustment, and only a few angles can be adjusted. The operation is not convenient and the adjustment is not flexible enough. It cannot directly follow the movement of the waist, back, shoulders, neck, or head. Therefore, it cannot fit and support the waist, back, shoulders, neck, or head well, and thus cannot adapt well to people's posture when using the chair for work or rest, reducing people's work efficiency or rest quality. Utility Model Content

[0003] This utility model provides a backrest unit support structure and a backrest that allows for free rotation and adjustment of the backrest unit, and is simple in structure and easy to operate.

[0004] The chair back unit support structure of this utility model includes a bracket plate connected to the chair back and a support frame connected to the bracket plate. The support frame is provided with a spherical recess, and a hinged ball that can rotate freely and is used for the seat back unit to pass through and be installed in the spherical recess.

[0005] The backrest unit support structure is tightly connected to the backrest via a bracket plate, serving a connecting and fixing function to ensure the stability of the backrest. Next, the support frame connects to the bracket plate, forming a stable support structure. The support frame has a spherical recess, within which a freely rotatable hinge ball is embedded. The spherical structure of the hinge ball allows it to rotate freely and unrestricted within the recess. The backrest unit is cleverly installed through the hinge ball, achieving not only a tight connection between the backrest and the support frame but also providing the backrest unit with a certain degree of freedom of movement, such as tilt adjustment and left-right swaying. Through the rotation of the hinge ball, the backrest unit can rotate freely. When the user leans against the backrest, the backrest unit rotates in sync with the movement of the waist, back, shoulders, neck, or head, achieving effects such as tracking the waist, back, shoulders, neck, or head. Therefore, it can well conform to and support the waist, back, shoulders, neck, or head to adapt to the different user needs, providing a more comfortable and personalized user experience.

[0006] As a preferred embodiment of the present invention, the support frame includes a support frame body and a detachable U-shaped clamping ring. The clamping ring cooperates with the support frame body to clamp the articulated ball. The opposing surfaces of the support frame body and the clamping ring are provided with spherical recesses for accommodating the articulated ball.

[0007] As a preferred embodiment of this utility model, the articulated ball comprises two detachable hemispheres.

[0008] 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.

[0009] 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.

[0010] 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.

[0011] 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 first elastic element in the mounting groove, so that the end of the limiter abuts against the limiting groove.

[0012] As a preferred embodiment of the present invention, the chair back unit includes two frames that can be brought closer together or moved apart from each other. Each frame is provided with a connecting rod that is inserted into a hinge ball and can move therein. The end of the connecting rod that is inserted into the hinge ball is also provided with a limiting structure.

[0013] As a preferred embodiment of this utility model, the support frame further includes a support plate connected to the support plate and a support frame body that can move back and forth. The support frame body has a cavity, and the support plate has a slide rail that extends into the cavity. The slide rail has multiple slots spaced apart on its side. The two sides of the cavity have slide grooves that cooperate with the slide rail. One side of the support frame body has a button that passes through the cavity. The button abuts against the inner wall of the cavity and is elastically compressed by a second elastic element. The upper or lower side or both sides of the button have protruding protrusions that can be inserted into the slots. Pressing the button causes the protrusions to slide out of the slots. After moving the support frame body, releasing the button causes the protrusions to extend into another slot.

[0014] As a preferred embodiment of this utility model, the support plate is provided with two opposing slide rails, and multiple slots are provided at intervals on the opposite sides of the two slide rails. The button is located between the two slide rails, and the upper and lower sides of the button are provided with protrusions that can be inserted into the slots.

[0015] As a preferred embodiment of this utility model, a slide table is provided on the back of the support plate and on the side opposite to the slide rail. A long strip window is provided vertically on the bracket plate for the slide table to pass through and move up and down relative to each other. A pressure plate is detachably installed on the slide table. The pressure plate and the support plate are respectively set on both sides of the bracket plate, and are installed on the bracket plate so that the support plate can move up and down. A swinging component is installed inside the slide table. A limiting post is provided on one side of the slide table. One end of the swinging component is provided with a pawl protruding from the slide table. The other end of the swinging component is recessed inward on the side facing the limiting post to form a recess for embedding into the limiting post. Several ratchet teeth are vertically provided on the side of the long strip window facing the ratchet. A tooth groove is formed between adjacent ratchet teeth for locking the ratchet. A third elastic component is also provided inside the slide table, which abuts against the middle of the swinging component and the inner side wall of the slide table to maintain the contact between the ratchet and the tooth groove.

[0016] As a preferred embodiment of this utility model, the support plate has an upper inclined surface and a lower inclined surface on the upper and lower sides of the ratchet side, respectively, to restrict the movement of the swinging component. The side of the swinging component near the ratchet is provided with a sliding protrusion that abuts against the inclined surface. A groove is provided at the bottom of the slide table to be engaged with the bottom end of the swinging component.

[0017] As a preferred embodiment of this utility model, a slide table is provided on the back of the support plate and on the side opposite to the slide rail. The bracket plate is vertically provided with a long strip window for the slide table to pass through and move relatively left and right. A pressure plate is detachably installed on the slide table. The pressure plate and the support plate are respectively set on both sides of the bracket plate. They cooperate to allow the support plate to move left and right on the bracket plate. The side of the long strip window facing the pressure plate is provided with several horizontal positioning grooves. The side of the pressure plate opposite to the long strip window is provided with positioning protrusions that elastically abut against the positioning grooves.

[0018] The chair back of this utility model has the chair back unit support structure described above, and has all the beneficial effects of the chair back unit support structure of this utility model. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a chair back unit support structure according to Embodiment 1.

[0020] Figure 2 This is an exploded view of a chair back unit support structure according to Embodiment 1.

[0021] Figure 3 This is a schematic diagram of the internal structure of a hinged ball.

[0022] Figure 4 This is a schematic diagram of the structure consisting of the main body of the support frame and the support plate, which can move back and forth.

[0023] Figure 5 This is a schematic diagram of another direction of structure, consisting of the main body of the support frame and the support plate, which can move back and forth.

[0024] Figure 6 This is a schematic diagram of a structure consisting of a support plate and a bracket plate that can move up and down.

[0025] Figure 7 This is a schematic diagram of the assembly structure of the support plate and the swinging component.

[0026] Figure 8 This is a schematic diagram showing the changing state of the oscillating component as the slide moves relative to the support plate.

[0027] Figure 9 This is a schematic diagram of a chair back unit support structure according to Embodiment 2.

[0028] Figure 10 This is an exploded view of a chair back unit support structure according to Embodiment 2.

[0029] Figure 11 This is a schematic diagram of the structure of the support plate and bracket plate in Embodiment 2, which can move left and right.

[0030] Figure 12 This is a front view of the structure formed by the support plate and bracket plate in Embodiment 2, which can move left and right.

[0031] Figure 13 This is an exploded view of the backrest unit support structure in Embodiment 3.

[0032] Figure 14 A schematic diagram of the structure that horizontally connects the two backrest unit frames for the backrest unit support structure.

[0033] Figure 15 A schematic diagram of the structure that vertically connects the two backrest unit frames to form a support structure for the backrest unit.

[0034] Figure 16 A schematic diagram of the structure connecting the three backrest unit frames to the backrest unit support structure.

[0035] Figure 17 A schematic diagram of a support structure for connecting one or more backrest units to the backrest.

[0036] Figure 18 This is a schematic diagram of another type of chair back support structure that connects one or more chair back units.

[0037] Figure 19 This is a schematic diagram of another type of chair back support structure that connects one or more chair back units.

[0038] Figure 20 This is a schematic diagram showing the adjustment and transformation states of the backrest unit, which is the support structure for the backrest unit.

[0039] Figure 21This is a schematic diagram showing the rotational transformation state of the chair back unit, which is the support structure for the chair back unit. Detailed Implementation

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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. Example 1

[0044] like Figure 1-6As shown, a chair back unit support structure includes a bracket plate 1 connected to the chair back and a support frame 2 connected to the bracket plate. The support frame 2 has a spherical recess 201, within which a freely rotatable hinge ball 3 is embedded for the chair back unit 4 to pass through and be installed. The bracket plate is tightly connected to the chair back, serving a connecting and fixing function to ensure the stability of the chair back. Next, the support frame is connected to the bracket plate to form a stable support structure. The support frame has a spherical recess, within which a freely rotatable hinge ball is embedded. The spherical structure of the hinge ball allows it to rotate flexibly and unrestricted within the recess. The chair back unit is cleverly installed through the hinge ball, achieving not only a tight connection between the chair back and the support frame but also giving the chair back unit a certain degree of freedom of movement, such as tilt adjustment and left-right swaying. By rotating the hinge ball, the backrest unit can rotate at a free angle. When the user leans against the backrest, the backrest unit will directly follow the movement of the waist, back, shoulders, neck, or head, without the need for manual adjustment. Therefore, it is easy to operate and the rotation level is very free and without too many restrictions. Thus, it can fit and support the waist, back, shoulders, neck, or head very well, thereby achieving the effects of following the waist, back, shoulders, neck, or head, adapting to the needs of different users and providing a more comfortable and personalized user experience.

[0045] Understandably, in other embodiments, the contact surfaces of the hinge ball and the spherical recess can be individually or mutually provided with friction stripes or frosted surfaces, or other anti-slip structures that can increase friction, thereby increasing the mutual friction force and making the backrest unit more difficult to rotate, thus improving the support force of the backrest unit. By changing the mutual friction force, the backrest unit can be made easier or more difficult to rotate, thereby adapting to the different support force requirements of different body types.

[0046] The support frame 2 includes a support frame body 202 and a detachable U-shaped clamping ring 203. The clamping ring cooperates with the support frame body to hold the articulated ball. Both the support frame body and the clamping ring have spherical recesses 201 on their opposite surfaces to accommodate the articulated ball. The cooperation between the support frame body and the clamping ring ensures stable clamping of the articulated ball. Because both the support frame body and the clamping ring have spherical recesses on their opposite surfaces, the articulated ball can be firmly fixed within them, ensuring that it will not shift or fall off during use, thus improving the stability and reliability of the structure. At the same time, the detachable design of the clamping ring facilitates the installation and replacement of the articulated ball, making the maintenance and operation of the entire support frame simpler.

[0047] The hinge ball 3 comprises two detachable hemispheres. Assembly 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 be easily disassembled, simplifying the operation and enhancing flexibility and applicability. Furthermore, mutually cooperating positioning posts and holes can be provided on the mating surfaces of the two hemispheres. Specifically, a positioning post 304 is provided on the mating surface of one hemisphere, while a corresponding positioning hole 305 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 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.

[0048] Furthermore, the chair back unit 4 is connected to the articulated ball joint 3. The chair back unit 4 includes a connecting rod 401 that horizontally passes through the articulated ball joint 3. Several limiting grooves 402 are horizontally spaced on the connecting rod. A limiter 301, elastically abutting against the limiting grooves 402, is installed inside the articulated ball joint 3. 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 horizontal position according to their needs and comfort. Moreover, because the chair back unit can move and be fixed horizontally relative to the articulated ball joint, it can simultaneously rotate and move horizontally. Therefore, even when the user moves left or right, the chair back unit can still move and rotate accordingly, continuously conforming to and supporting the user's body, further enhancing the adjustable function and personalized adaptability of the chair back unit.

[0049] Furthermore, the hinge ball 3 is provided with a mounting groove 302 for mounting the limiter 301. The limiter elastically compresses the first elastic element 303 within the mounting groove, causing the end of the limiter to abut against the limiting groove. The elastic compression of the first elastic element within the mounting groove ensures that the end of the limiter can tightly abut against the limiting groove, providing stable support and guidance. 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 301 or the mounting groove 302 and the first elastic element, or both the limiter 301 and the mounting groove and the first elastic element, can be flat or have recessed holes to limit the first elastic element, further enhancing the stability of the limiter.

[0050] It is understood that in other embodiments, the connection method of the articulated ball, connecting rod 401, 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 401, 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 connected to the backrest unit, or detachably connected; 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.

[0051] The support frame 2 also includes a support plate 204 connected to the support plate and a support frame body 202 that can move back and forth. The support frame body 202 has a cavity. The support plate 204 has a slide rail 205 that extends into the cavity. The slide rail has multiple slots 206 spaced apart on its side. The cavity has sliding grooves 207 that cooperate with the slide rail on both sides. The support frame body has a button 208 that passes through the cavity on one side. Furthermore, the support frame body has a window for the button to pass through. The button abuts against the inner wall of the cavity and is elastically compressed by a second elastic element 209. The button has protruding protrusions 210 that can be inserted into the slots on its upper or lower side or both sides. Pressing the button causes the protrusions to slide out of the slots. After moving the support frame body, releasing the button causes the protrusions to extend into another slot under the action of the second elastic element 209. The support frame's internal chambers, slide rails on the support plate, and multiple slots on the sides of the slide rails allow for adjustable forward and backward movement. This not only enables flexible adjustments based on user needs, such as body shape and posture, to provide more comfortable support and a better user experience, but also allows the backrest unit to rotate and move forward and backward simultaneously, as it can move the hinge ball. Therefore, even if the user moves forward or backward, the backrest unit can still move and rotate, maintaining a close fit to the body, further enhancing comfort and adaptability. Slide grooves on both sides of the chambers, mate with the slide rails, ensure the support frame's smoothness and stability during movement, preventing wobbling or damage caused by improper movement. Meanwhile, a second elastic element that abuts against the inner wall of the chamber and provides elastic compression, along with extended protrusions on the top, bottom, or sides of the button that can engage with slots, ensures that the support frame body is stably fixed after being moved to the desired position through the cooperation of the protrusions and slots, preventing accidental movement during use. Users simply press the button to slide the protrusion out of the slot, move the support frame body to the desired position, and release the button to allow the protrusion to extend into another slot, thus fixing the support frame body in place. This design simplifies the user's adjustment operation, improves the convenience and comfort of adjustment, and allows users to easily adjust the chair's support structure according to their needs, enhancing the user experience.

[0052] Furthermore, the support plate 204 is provided with two opposing slide rails 205, and multiple slots 206 are spaced apart on the opposite sides of the two slide rails. The button 208 is located between the two slide rails, and the upper and lower sides of the button are provided with locking protrusions that can be inserted into the slots. The dual slide rail configuration can better distribute the force when the support frame moves, improve the smoothness and stability of the support frame during movement, reduce shaking or jamming caused by improper movement, and ensure the safety and comfort of the chair.

[0053] A slide table 211 is provided on the back of the support plate 204 and on the side opposite to the slide rail. A long strip window 101 is provided vertically on the bracket plate 1 for the slide table to pass through and move up and down relative to each other. A pressure plate 212 is detachably installed on the slide table 211. The pressure plate and the support plate are respectively set on both sides of the bracket plate and are installed on the bracket plate so that the support plate can move up and down. A swing member 5 is installed in the slide table 211. A limiting post 213 is provided on one side of the slide table. One end of the swing member 5 is provided with a pawl 501 protruding from the slide table. The other end of the swing member is recessed inward on the side facing the limiting post to form a recess 502 for embedding into the limiting post. Several ratchet teeth 102 are vertically provided on the side of the long strip window facing the ratchet. A tooth groove is formed between adjacent ratchet teeth for locking the ratchet. A third elastic member 6 is also provided in the slide table, which abuts against the middle of the swing member and the inner side wall of the slide table to maintain the contact between the ratchet and the tooth groove. By installing a slide on the back of the support plate and a long, narrow window vertically positioned on the support plate for the slide to pass through and move relatively up and down, the support plate can be adjusted vertically. This adjustment function not only allows for flexible adjustment of the chair's support structure according to user needs or usage scenarios—for example, adjusting the height of the support plate based on the user's height and sitting habits to provide more comfortable support and a better user experience—but also, because it can drive the hinge ball for height adjustment, the backrest unit can simultaneously rotate and rise and fall. Therefore, regardless of the user's height or changes in posture, the backrest unit can move up and down and rotate, continuously conforming to the user's back and providing precise support. The pawl and tooth groove work together cleverly; when the support plate moves to the target position, the pawl engages with the corresponding tooth groove, firmly locking the support plate and preventing accidental sliding or wobbling during use, significantly enhancing stability and reliability. Simultaneously, the limiting post and recess work together to provide a stable swing fulcrum and limiting fulcrum for the swing component, ensuring precise and stable operation of the swing component and guaranteeing smooth adjustment and fixing of the support plate.

[0054] Furthermore, such as Figure 7-8As shown, the support plate 1 has an upper inclined surface 104 and a lower inclined surface 105 on the upper and lower sides of the ratchet side, respectively, to restrict the movement of the swing member 5. The side of the swing member 5 near the pawl 501 has a sliding protrusion 503 that abuts against the inclined surface. A groove 215 is provided at the bottom of the slide table 211 to engage the bottom end of the swing member 5. When the slide table 211 moves upward to its uppermost position, the upper inclined surface of the support plate 1 restricts and guides the swing member 5, preventing it from continuing to move upward with the slide table 211. Simultaneously, under the combined guiding action of the upper inclined surface of the support plate 1, the limiting post 213, and the groove 502, the pawl 501 swings in the opposite direction of the tooth groove. The swing member 5 compresses the third elastic member 6 and falls into the groove at the bottom of the slide table 211, thus disengaging the pawl 501 from the tooth groove. At this time, during the downward movement of the slide table 211, the third elastic member 6 can no longer engage the pawl 501 in the tooth groove, ensuring that the slide table 211 can move downward smoothly. When the slide 211 moves to its lowest point, the lower inclined surface of the support plate 1 pushes the bottom end of the swing member 5 out of the groove. Under the compression and tightening action of the third elastic member 6, the pawl 501 re-enters the tooth groove, completing the locking action.

[0055] In other embodiments, a return spring may be connected between the slide and the side of the elongated window 101 that is close to or far from it, so that the slide can be reset more quickly within the elongated window 101. Example 2

[0056] like Figure 3-5 and Figure 9-12 As shown, the difference from Embodiment 1 is that the backrest unit 4 includes a connecting rod 401 that passes vertically through the hinge ball 3. Several limiting grooves 402 are vertically spaced on the connecting rod. A limiter 301 that elastically abuts against the limiting grooves 402 is installed inside the hinge ball 3, enabling 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, since the backrest unit can move and be fixed relative to the hinge ball in the vertical direction, even if the user's body moves up and down, the backrest unit can follow and rotate in real time, continuously conforming to and supporting the user's body, thereby further improving the adjustment adaptability of the backrest unit.

[0057] A slide table 211 is provided on the back of the support plate 204, on the side opposite to the slide rail. A long, narrow window 101 is vertically provided on the bracket plate 1, through which the slide table passes and moves relatively left and right. A pressure plate 212 is detachably mounted on the slide table. The pressure plate and the support plate are respectively located on both sides of the bracket plate, cooperating to allow the support plate to move left and right while mounted on the bracket plate. Several positioning grooves 103 are horizontally provided on the side of the long, narrow window facing the pressure plate. Positioning protrusions 214 that elastically abut against the positioning grooves are provided on the side of the pressure plate 212 opposite to the long, narrow window, thus enabling the support plate to be positioned and fixed at different locations after horizontal movement. With the cooperation of the slide table and the long, narrow window, the support plate can move left and right, flexibly adjusting its position relative to the bracket plate. This allows the backrest unit to be flexibly adjusted horizontally according to the user's individual needs, precisely adjusting it to a comfortable and suitable position for the user. This significantly improves the adjustment function of the backrest unit, enhances its personalized adaptability, and provides a more comfortable and convenient user experience. Moreover, because it can move the hinge ball to adjust left and right, even if the user moves left or right, the backrest unit can also move left and right and rotate to continuously conform to the user's body, thereby further improving the adjustability and comfort of the backrest unit. Example 3

[0058] The chair back unit 4 can be composed of a single frame or two or more frames. The chair back unit includes two frames that can be positioned close to or far apart. Each frame has a connecting rod that inserts into and moves within a hinge ball. Several limiting grooves 402 are laterally spaced on the connecting rod. A limiter 301, elastically abutting against the limiting grooves 402, is installed inside the hinge ball 3. Figure 13 and Figure 14 As shown. For example, when the backrest unit comprises multiple frames, each frame is independently connected to a connecting rod inserted into the hinge ball. In this way, the spacing between the multiple frames of the backrest unit can be adjusted. If the connecting rod is arranged laterally, the width of the spacing between the multiple frames of the backrest unit can be adjusted to meet the needs of different users (such as body size) or support requirements, further enhancing comfort and personalization. Furthermore, the hinge ball 3 also extends to both sides with extensions 306 for mounting the connecting rod, increasing the moving distance of the connecting rod and further expanding the range of width adjustment between the multiple frames of the backrest unit. Furthermore, the end of the connecting rod inserted into the hinge ball is also provided with a limiting structure 307 to prevent the frames of the backrest unit from being excessively pulled open, causing the connecting rod to slip out of the hinge ball. Example 4

[0059] The difference from Example 3 is that, as Figure 15As shown, the connecting rods that connect the multiple frames of the chair back unit to the hinge ball are arranged vertically, so the height spacing between the multiple frames can be adjusted.

[0060] In addition to the embodiments described above, the chair back unit support structure of this utility model can also adopt other suitable structures.

[0061] In other embodiments, it is obvious that features from various embodiments can be combined with each other without conflict, thereby producing some new embodiments. For example, for a mechanism that achieves vertical movement and fixation, the structure in Embodiment 1 where the support plate 101 and slide 211 engage through ratchet, pawl, and tooth groove can be replaced with the structure in Embodiment 2 where the support plate 101 and slide 211 engage through positioning protrusion and positioning groove. The resulting new embodiment can also achieve vertical movement and fixation adjustment.

[0062] In other embodiments, alternative solutions can be used to enable horizontal, vertical, or fore-and-aft movement adjustment of the chair back unit. For example, in any of embodiments one through four, the connecting rod and the hinge ball are not moved and fixed horizontally or vertically through a structure with a limiter and a limit groove 402. Instead, by setting an interference fit between the connecting rod and the hinge ball, and appropriately adjusting the tightness of the interference fit to provide suitable friction for the connecting rod; or by setting the contact surface between the connecting rod and the hinge ball as an appropriate friction surface, the chair back unit can also be positioned and fixed in different horizontal or vertical positions. Similarly, the structures for horizontal, vertical, or forward / backward movement and fixation in any of the above embodiments, such as the structure between the support plate 101 and the slide 211 using a ratchet, pawl, and tooth groove, or the structure between a positioning protrusion and a positioning groove, or the structure between the support plate 204 and the forward / backward movable support frame body 202 using a locking protrusion and locking groove, can be directly used if only horizontal, vertical, or forward / backward movement adjustment is desired and the fixing force requirement is not high, or fixation is not required. Alternatively, various elastic elements such as compression springs and tension springs can be used to connect the support plate 101 and the slide 211, or the support plate 204 and the support frame body 202, achieving the same horizontal, vertical, or forward / backward movement and similar adaptive adjustment effects. Furthermore, in some other embodiments, the support frame has multiple spherical recesses, allowing the hinged ball to move flexibly and be positioned between adjacent spherical recesses, also enabling the forward / backward movement and fixation adjustment of the chair back unit.

[0063] Here are some examples of the structure of a chair back unit. In some embodiments, the chair back unit consists of a single, integral frame, such as... Figure 1 As shown, it can also consist of two or more frames, but each frame is separate, such as... Figure 14 and Figure 15 As shown, it can also consist of two or more frames, but the frames are all or partly connected to each other by connecting pieces, which can be elastic pieces, etc. In one embodiment, it consists of three frames, with adjacent frames connected to each other by elastic pieces 7, such as... Figure 16 .

[0064] In some embodiments, the backrest unit may be a lumbar pillow, and thus some embodiments are lumbar pillows with the backrest unit support structure described herein; in other embodiments, the backrest unit may be a backrest, and thus some embodiments are backrests with the backrest unit support structure described herein; or if the backrest unit is a headrest, neck pillow, or shoulder pillow, then some embodiments are headrests, neck pillows, or shoulder pillows with the backrest unit support structure described herein.

[0065] Here are some examples of chair backs with this backrest unit support structure. In some embodiments, the chair back is composed of an entire chair back unit with this backrest unit support structure, such as... Figure 17 In 17a; in other embodiments, the chair back is composed of multiple independent chair back units, such as lumbar support, backrest, shoulder support, neck support, headrest, etc., and the lumbar support may have its own support structure only in the lumbar support, such as... Figure 17 17b; This backrest unit support structure can also be found separately on the backrest, the neck pillow, or the headrest; it can also be found separately on the shoulder pillows, such as... Figure 17 17c; or used in any combination of lumbar support, backrest, shoulder support, neck support, or headrest, such as when both the lumbar support and backrest have the support structure of this chair back unit, such as Figure 17 17d in the text; or simultaneously, the lumbar pillow, backrest, shoulder pillow, and head and neck pillow all have the support structure of this chair back unit, such as Figure 18 Additionally, multiple backrest units with this backrest unit support structure can simultaneously support a single area, such as... Figure 19 It features two lumbar support pillows and two backrests with the same support structure, allowing for independent adjustment and support of the left and right sides of the waist or back. The backrest support structure can be directly or detachably attached to the backrest support frame or other components of the backrest.

[0066] A chair back has the aforementioned chair back unit support structure and possesses all the beneficial effects of the chair back unit support structure of this utility model.

[0067] The following uses a lumbar pillow and backrest with the aforementioned backrest unit support structure as examples to illustrate some specific operations and usage methods (the specific operations and usage methods of shoulder pillows, neck pillows, or headrests with the aforementioned backrest unit support structure are similar and will not be repeated). Figure 20 As shown, the backrest can be adjusted upwards to accommodate the user's height; the lumbar support can be adjusted downwards, with one lumbar support moving to the left and the other to the right to adjust the spacing between them to better fit the user's waist position and width; simultaneously, the lumbar support can also be adjusted forwards and rotated upwards to better conform to and support the user's waist. Or as... Figure 21 As shown, when using the lumbar support or backrest unit, the tilt angle can be adjusted, the chair can rotate up and down, or it can swing left and right, thus providing a close and supportive effect by following the movement of the user's waist or back. In addition, these functional parts can be used individually or in combination to meet different support needs of users.

[0068] 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 chair back unit support structure, characterized in that, It includes a support plate (1) connected to the backrest and a support frame (2) connected to the support plate. The support frame (2) is provided with a spherical recess (201). A freely rotatable hinge ball (3) for the backrest unit (4) to pass through is embedded in the spherical recess (201).

2. The chair back unit support structure according to claim 1, characterized in that, The support frame (2) includes a support frame body (202) and a detachable U-shaped clamping ring (203). The clamping ring cooperates with the support frame body to clamp the articulated ball. The support frame body and the clamping ring are provided with spherical recesses (201) for accommodating the articulated ball on their opposite surfaces.

3. The chair back unit support structure according to claim 1 or 2, characterized in that, The articulated ball (3) comprises two detachable hemispheres.

4. The chair back unit support structure according to claim 3, characterized in that, A positioning post (304) is provided on the mating surface of one hemisphere, while a corresponding positioning hole (305) is provided on the mating surface of the other hemisphere.

5. The chair back unit support structure according to claim 3, characterized in that, It also includes a backrest unit connected to the articulated ball. The backrest unit (4) includes a connecting rod (401) that passes horizontally through the articulated ball (3). Several limiting grooves (402) are provided horizontally and laterally on the connecting rod. A limiter (301) that elastically abuts against the limiting groove (402) is installed inside the articulated ball (3).

6. The chair back unit support structure according to claim 3, characterized in that, It also includes a backrest unit connected to the articulated ball. The backrest unit (4) includes a connecting rod (401) that passes vertically through the articulated ball (3). Several limiting grooves (402) are provided vertically at intervals on the connecting rod. A limiter (301) that elastically abuts against the limiting groove (402) is installed inside the articulated ball (3).

7. The chair back unit support structure according to claim 5 or 6, characterized in that, The articulated ball (3) is provided with a mounting groove (302) for installing a limiter (301). The limiter is elastically compressed with a first elastic element (303) in the mounting groove, so that the end of the limiter abuts against the limiting groove.

8. The chair back unit support structure according to claim 5 or 6, characterized in that, The chair back unit includes two frames that can be brought closer or further apart. Each frame is provided with a connecting rod that is inserted into and can move within a hinge ball. One end of the connecting rod inserted into the hinge ball is also provided with a limiting structure (307).

9. The chair back unit support structure according to claim 1, characterized in that, The support frame (2) also includes a support plate (204) connected to the support plate and a support frame body (202) that can move back and forth. The support frame body (202) has a cavity. The support plate (204) has a slide rail (205) that extends into the cavity. The slide rail has multiple slots (206) spaced apart on its side. The cavity has sliding grooves (207) that cooperate with the slide rail on both sides. The support frame body has a button (208) that passes through the cavity on one side. The button abuts against the inner wall of the cavity and is elastically compressed by a second elastic element (209). The button has protruding protrusions (210) that can be inserted into the slots on its upper or lower side or both sides. Pressing the button causes the protrusions to slide out of the slots. After moving the support frame body, releasing the button causes the protrusions to extend into another slot.

10. The chair back unit support structure according to claim 9, characterized in that, The support plate (204) is provided with two opposing slide rails (205), and multiple slots (206) are provided at intervals on the opposite sides of the two slide rails. The button (208) is located between the two slide rails, and the upper and lower sides of the button are provided with protrusions that can be inserted into the slots.

11. The chair back unit support structure according to claim 9, characterized in that, A slide (211) is provided on the back of the support plate (204) and on the side opposite to the slide rail. A long strip window (101) is provided vertically on the bracket plate (1) for the slide to pass through and move up and down relative to each other. A pressure plate (212) is detachably installed on the slide (211). The pressure plate and the support plate are respectively set on both sides of the bracket plate and are installed on the bracket plate so that the support plate can move up and down. A swing member (5) is installed in the slide (211). A limiting post (213) is provided on one side of the slide. A pawl (501) protruding from the slide is provided at one end of the swing member (5). The other end of the swing member is recessed inward on the side facing the limiting post to form a recess (502) embedded in the limiting post. Several ratchet teeth (102) are vertically provided on the side of the long strip window facing the ratchet. A tooth groove is formed between adjacent ratchet teeth for locking the ratchet. A third elastic member (6) is also provided in the slide, which is abutted between the middle of the swing member and the inner side wall of the slide to keep the ratchet in contact with the tooth groove.

12. The chair back unit support structure according to claim 11, characterized in that, The support plate (1) has an upper inclined surface (104) and a lower inclined surface (105) on the upper and lower sides of the ratchet side, respectively, to restrict the movement of the swing member (5). The swing member (5) has a sliding protrusion (503) that abuts against the inclined surface on the side near the pawl (501). The bottom of the slide (211) has a groove (215) that can be inserted into the bottom of the swing member (5).

13. The chair back unit support structure according to claim 9, characterized in that, The support plate (204) has a slide table (211) on the back side and the side opposite to the slide rail. The bracket plate (1) has a long strip window (101) for the slide table to pass through and move left and right relative to each other. A pressure plate (212) is detachably installed on the slide table. The pressure plate and the support plate are respectively set on both sides of the bracket plate and are installed on the bracket plate so that the support plate can move left and right. The side of the long strip window facing the pressure plate has several horizontal positioning grooves (103). The side of the pressure plate (212) opposite to the long strip window has a positioning protrusion (214) that elastically abuts against the positioning groove.

14. A chair back, characterized in that, The chair back has a chair back unit support structure as described in any one of claims 1-13.

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