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 arm with the middle part connected with a chair, the support arm is hinged with a spherical hinge piece capable of moving up and down relative to the support arm and a third limiting piece used for clamping the spherical hinge piece, and the spherical hinge piece is also connected with one or more chair back units. The chair back unit is hinged to the supporting arm through the spherical hinge piece and can rotate freely, so that the chair back unit can incline to form any angle according to the sitting posture of a user to fit and wrap the waist or the back of the user, and different sitting posture requirements of the user are met; meanwhile, the spherical hinge piece is matched with the third limiting piece to perform up-and-down position height adjustment relative to the supporting arm, and the height of the chair back unit can be adjusted for supporting according to the height difference of the waist or the back caused by the height difference of the user, so that a flexible supporting effect is provided, and the comfort of the human body is improved.

Description

Technical Field

[0001] The utility model relates to a support device for the waist or back of a seat, in particular to a seat back unit support structure and a seat back. Background Art

[0002] The design of a chair's backrest unit is crucial. It not only needs to support the user's lower back, known as the lumbar support, but also provide comfortable support for the entire back, known as the backrest. Traditionally, the backrest unit is a single structure fixed to the chair. This design only provides basic back support and fails to fully adapt to the user's back curve. This single support structure lacks flexibility and cannot be adjusted to the user's specific body shape and sitting posture, resulting in limited support effectiveness.

[0003] With the development of ergonomics, chair design has evolved from a single back unit to a double back unit. The double back unit design provides support from both sides of the user. Compared with a single back unit, it can better disperse the pressure on the back and provide more comprehensive back support. However, this design still has limitations. Since each user's body shape and sitting habits are different, including height, weight, and personal preferences, even with a double back unit or more back units (such as a three-back unit structure), if these back units are fixed, they still cannot fully adapt to the different specific needs of each user. This fixity limits the adaptability of the chair, making it impossible for the back unit to dynamically adjust according to the user's waist or back curve, making it difficult to flexibly meet different support needs. Utility Model Content

[0004] The utility model provides a chair back unit supporting structure and a chair back which can be adjusted according to the body shape and leaning habit of the user, can fit the waist or back well, and improve the comfort of the human body.

[0005] The chair back unit support structure described in the present invention includes a support arm connected to the seat in the middle, and the support arm is hingedly installed with a spherical hinge that can move up and down relative to the support arm and a third limiting member for clamping the spherical hinge. The spherical hinge is also connected to one or more chair back units.

[0006] The backrest unit support structure is described, and the backrest unit is flexibly mounted on the support arm through a spherical hinge, which enables multi-angle rotation. The backrest unit can freely adjust the tilt angle according to the user's sitting posture, closely fitting the user's waist or back to adapt to various sitting postures and meet personalized comfort needs. At the same time, the spherical hinge cooperates with the third limiter to adjust the vertical height of the backrest unit. The height of the backrest unit can be adjusted according to the different waist or back heights caused by the height difference of the user, so that the backrest unit of the chair can better adapt to the body shape and sitting posture requirements of different users, providing a more personalized and comfortable support effect. Unlike traditional chairs that can only lift and lower the backrest unit vertically, this structure can adjust the height while also adjusting the angle according to the user's back or waist curve. It is easy to operate and provides a better user experience. The backrest unit support structure described in the utility model not only improves the adaptability and comfort of the seat, but also brings a more personalized support effect to users of different body shapes and sitting postures.

[0007] As a preferred solution of the present invention, mounting seats are installed at both ends of the support arm and can move relatively closer or farther away along the lateral direction of the support arm. A first limiting member is provided in the mounting seat for fixing the mounting seat at any position of the support arm, and its spherical hinge is hingedly mounted on the mounting seat for up and down movement, and a third limiting member is provided on the mounting seat.

[0008] As a preferred solution of the present invention, the first limiting member includes an elastic limiter arranged in the mounting seat, and a plurality of limit slots are arranged at intervals of transverse direction at the end of the support arm, and the end of the limiter abuts against the limit slot.

[0009] As a preferred solution of the present invention, a clamping block that can be moved along the support arm is detachably installed in the mounting seat, and a placement groove for placing the limiter is provided at a position of the clamping block relative to the limit groove. The limiter compresses a spring arranged in the placement groove so that the end of the limiter rests against the limit groove.

[0010] As a preferred solution of the present invention, a sliding member that moves forward and backward relative to the mounting seat and a second limiting member for fixing the sliding member at any position in the mounting seat are also installed in the mounting seat. The sliding member is hingedly installed with a spherical hinge that can move up and down relative to the sliding member and a third limiting member for clamping the spherical hinge. The spherical hinges are respectively connected to the chair back units.

[0011] As a preferred solution of the present invention, the sliding member is a sliding shell that is sleeved on the mounting seat and can move back and forth.

[0012] As a preferred solution of the present invention, the second limiting member includes a button extending from one side of the sliding member and a slider arranged in the mounting seat opposite to the button. The button and the slider are connected by a compression spring. A sliding groove for sliding the slider back and forth is provided on the inner side of the mounting seat. Extended protruding clamping protrusions are provided on the upper and lower sides of the button. A plurality of clamping grooves are arranged horizontally at intervals on the mounting seat on the side opposite to the sliding groove. The middle parts of the plurality of clamping grooves are connected to form a window for the button to pass through. Pressing the button causes the clamping protrusion to slide out of the slot. After moving the sliding member, releasing the button causes the clamping protrusion to extend into another slot.

[0013] As a preferred solution of the present invention, the third limiting member includes an abutment block movably mounted on the sliding member and a pressing block supporting the limiting abutment block. The pressing block is movably mounted on the side of the sliding member through a spring. Pressing the pressing block leaves a movable space on one side of the abutment block.

[0014] As a preferred solution of the present invention, a plurality of circular limiting grooves adapted to the hinge joint of the spherical hinge are vertically spaced apart on two opposite sides of the abutment block and the sliding member.

[0015] As a preferred solution of the present invention, the surface of the hinge joint or the circular limiting groove of the spherical hinge is provided with a rough surface for increasing friction.

[0016] As a preferred solution of the present invention, protrusions extend from the upper and lower ends of the abutment block, and the sliding member is provided with grooves for limiting the movement of the protrusions.

[0017] As a preferred solution of the present invention, a corner of the pressing block close to the abutting block is provided with an inclined edge.

[0018] As a preferred solution of the present invention, the support arm is elastic.

[0019] As a preferred solution of the present invention, the multiple chair back units are connected to each other via an elastic mechanism, and the spherical hinge is connected to one of the chair back units.

[0020] The chair back of the utility model has the chair back unit support structure and has all the beneficial effects of the chair back unit support structure of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of a chair back unit support structure.

[0022] Figure 2 This is an exploded diagram of a chair back unit support structure.

[0023] Figure 3 Schematic diagram of the structure of the first limiting member.

[0024] Figure 4 Schematic diagram of the second limiting member structure.

[0025] Figure 5 Schematic diagram of the structure of the third limiting member.

[0026] Figure 6 A side view of a seat back unit support structure.

[0027] Figure 7 for Figure 6 Cross-sectional view along the AA direction.

[0028] Figure 8 A cross-sectional view of a chair back unit support structure according to another embodiment.

[0029] Figure 9 Schematic diagram of the installation structure of a single seat back unit.

[0030] Figure 10 Schematic diagram of the installation structure of three seat back units.

[0031] Figure 11 Schematic diagram of the installation structure of four seat back units.

[0032] Figure 12 This is a schematic structural diagram of a single spherical hinge connecting two seat back units according to another embodiment.

[0033] Figure 13 This is a schematic diagram of the structure of a set of seat back units installed on the seat bracket.

[0034] Figure 14 This is a structural diagram of a seat frame with only one set of seat back units installed at the waist.

[0035] Figure 15 This is a schematic diagram of the structure in which two sets of seat back units are installed on the seat frame.

[0036] Figure 16 Schematic diagram of the rotation change of the seat back unit in the top view direction.

[0037] Figure 17 Schematic diagram of the rotation change of the seat back unit in the front view direction.

[0038] Figure 18 Schematic diagram of the rotation change of the seat back unit when viewed from the side. DETAILED DESCRIPTION

[0039] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...), then the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0041] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "disposed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0042] If the embodiments of the present invention contain descriptions involving "first" or "second," the descriptions are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly specifying the number of the technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the various technical features (including but not limited to structures, materials, or characteristics) of each embodiment can be arbitrarily combined. To keep the description concise, not all possible combinations of the various technical features in the embodiments are described. However, as long as there are no contradictions in the combination of these technical features, they should be considered to be within the scope of this specification.

[0043] like Figure 1-7The figure shows a chair back unit support structure comprising an arm 1 connected to the seat at its center. The arm 1 is hingedly mounted with a spherical hinge 6 that can move up and down relative to the arm, and a third stopper 7 for clamping the spherical hinge. The spherical hinge is also connected to the chair back unit. The chair back unit can be a lumbar pillow for lumbar support or a backrest for back support. The spherical hinge flexibly attaches to the arm, enabling multi-angle rotation. This allows the chair back unit to freely adjust its tilt angle according to the user's sitting posture, closely fitting the user's waist or back to accommodate various sitting positions and meet personalized comfort needs. The spherical hinge, in conjunction with the third stopper, allows for vertical height adjustment of the chair back unit. This allows the chair back unit to be adjusted to accommodate varying waist or back heights due to height differences. This allows the chair back unit to better adapt to different body shapes and sitting postures, providing more personalized and comfortable support. Unlike traditional seats that can only lift the backrest unit vertically, this structure can adjust the height while also adjusting the angle according to the user's back or waist curve. It is easy to operate and provides a better user experience. The backrest unit support structure described in this utility model not only improves the adaptability and comfort of the seat, but also brings more personalized support effects to users of different body shapes and sitting postures.

[0044] Mounting blocks 2 are mounted at both ends of the arm 1, allowing for relative movement toward or away from each other along the arm's transverse direction. Mounting blocks 2 are equipped with a first stopper 3 for securing the mounting block at any position on the arm. A spherical hinge 6 is hingedly mounted on the mounting block for vertical movement, and a third stopper 7 is provided on the mounting block. The mounting blocks, in conjunction with the first stopper, are movable and fixed along the arm, allowing the two seat back units, mounted on the mounting blocks at each end of the arm, to be adjusted in distance relative to each other, achieving a better fit around the user's waist or back, thereby providing flexible support and enhancing comfort.

[0045] The first stopper 3 comprises a resilient stopper 301 within the mounting base. The end of the support arm 1 is laterally spaced apart with a plurality of stopper slots 101, into which the end of the stopper abuts. Furthermore, a removable clamping block 201 is mounted within the mounting base 2 and is movable along the support arm. The clamping block is positioned opposite the stopper slots and has a seating slot 202 for the stopper 301. The stopper compresses a spring within the seating slot, causing the end of the stopper to abut within the slot. By pulling the backrest unit, the mounting base moves laterally along the support arm, sliding the stopper out of the slot until it reaches the next slot, where it abuts within the slot again, thus allowing for convenient adjustment of the distance between the two backrest units. The number of stopper slots 101 can be two, three, or more. By increasing or decreasing the number of stopper slots 101, the adjustment range, accuracy, and accuracy of the backrest unit spacing can be increased or decreased.

[0046] Further, such as Figure 8 As shown, the end of the support arm can extend through the mounting seat, thereby increasing the range of movement of the mounting seat and further enhancing the adjustment levels, accuracy, and range of the seat back unit's spacing. Furthermore, a retaining rib 102 can be provided at the end of the support arm to abut against the outside of the mounting seat, thereby preventing the mounting seat from sliding out of the arm during adjustment. Furthermore, a groove (not shown) can be provided on the side of the mounting seat to accommodate the retaining rib. When the mounting seat moves to the outermost position of the support arm, the retaining rib can be well embedded in the groove, ensuring that the outer plane of the retaining rib is aligned with the outer plane of the mounting seat, avoiding protrusion and enhancing the appearance.

[0047] The mounting seat is also provided with a sliding member 4 that can move forward and backward relative to the mounting seat, and a second limiting member 5 for fixing the sliding member at any position within the mounting seat. The sliding member 4 is hingedly mounted with a spherical hinge 6 that can move up and down relative to the sliding member, and a third limiting member 7 for clamping the spherical hinge. The spherical hinges are connected to the chair back units 8 and 9, respectively. The sliding member 4 is a sliding shell that can be mounted on the mounting seat 2 and can move forward and backward. Specifically, the sliding shell is a shell that is mounted on the mounting seat, and the mounting seat is provided with a corresponding inner wall. The shell and the inner wall of the mounting seat move in contact with each other. The sliding member and the second limiting member can be fixed in the mounting seat to move forward and backward, so that the chair back unit can be adjusted in the forward and backward direction to meet the changes in the forward and backward movement of the user's sitting posture to adjust the support position of the chair back unit, provide a flexible support effect, and improve human comfort.

[0048] The second limiting member 5 includes a button 501 extending from one side of the slider and a slider 502 disposed within the mounting base opposite the button. The button and the slider are connected by a compression spring. A slide groove 203 is disposed on the inner side of the mounting base 2 for the slider to slide back and forth. Extended protrusions 503 are disposed on the upper and lower sides of the button 501. Multiple slots 204 are disposed transversely and spaced apart on the mounting base 2 opposite the slide groove. The middle portions of the multiple slots are connected to form a window for the button to pass through. Pressing the button causes the protrusion to slide out of the slot. After moving the slider, releasing the button causes the protrusion to extend into another slot. By pressing the button to bring the button closer to the slider and simultaneously causing the protrusion extending from the button to slide out of the slot, the slider can be moved relative to the mounting base, and the slider drives the button to move to the next slot to achieve positioning.

[0049] The third limiting member 7 includes an abutment block 701 movably mounted on the sliding member and a pressing block 702 that supports the limiting abutment block. The pressing block is movably mounted on the side of the sliding member via a spring 707. Pressing the pressing block frees up a movable space on one side of the abutment block. The pressing block provides a clamping force from one side of the abutment block to clamp the spherical hinge. After the pressing block is pressed, the space originally occupied by the pressing block becomes a space for the abutment block to move. The abutment block releases the spherical hinge, allowing the spherical hinge to be adjusted vertically or angularly. After the pressing block is reset, it re-engages with one side of the abutment block.

[0050] A plurality of circular stop slots 703 are vertically spaced apart on opposite sides of the abutment block and the sliding member, adapted to mate with the hinged joint of the spherical hinge. The circular stop slots increase the contact area with the hinged joint of the spherical hinge, facilitating rotation at any angle and providing better clamping and securing. When the spherical hinge is adjusted up or down to the next circular stop slot, the abutment block will again abut against the spherical hinge to maintain its position.

[0051] Furthermore, the surface of the hinge joint or circular limit groove of the spherical hinge can be provided with a rough surface that increases friction. The rough surface can be a frosted surface that has been frosted, or it can be anti-slip stripes, or it can be other anti-slip structures that increase friction. The rough surface increases the friction on the surface of the hinge joint or circular limit groove of the spherical hinge, which is beneficial to prevent the hinge joint of the spherical hinge from sliding relative to the circular limit groove when clamped and fixed, and thus helps to improve the support stability of the chair back unit.

[0052] The abutment block is provided with protruding blocks 704 extending from the upper and lower ends thereof, and the sliding member is provided with grooves 705 for limiting the movement of the protruding blocks, so that the abutment block can move more stably on the sliding member.

[0053] The pressing block has an angled edge 706 at the corner near the abutment block, allowing the abutment block to abut the angled edge at its center or at any other location. The slope of the angled edge allows the abutment block to be adjusted relative to the spherical hinge, thereby varying the tightness of the abutment block against the spherical hinge. This not only allows for adjustment of the position and angle of the spherical hinge, but also prevents the spherical hinge from sliding out of the circular retaining groove on the side opposite the sliding member due to the abutment block moving too far during adjustment. Furthermore, when the backrest unit becomes old or damaged, or needs to be replaced with another backrest unit based on user preference, such as a different number of backrest units (e.g., a single backrest unit for a double backrest unit), or a backrest unit of a different shape or material (e.g., a mesh backrest unit for a leather backrest unit), the push block can be pressed to the bottom, allowing the abutment block to move far enough to disassemble the spherical hinge and achieve removal and replacement of the backrest unit, thereby facilitating replacement, repair, and cleaning of the backrest unit. Furthermore, when the push block is pressed to the bottom and reset, its inclined edge guides the abutment block to move smoothly and secure it to one side of the spherical hinge, ensuring structural stability and ease of operation.

[0054] The support arms are elastic and have adaptive deformation and rebound functions. The elasticity of the support arms can elastically support the user's waist or back. The chair back units on both sides form like two hands, which can elastically open or tighten to support the user's waist or back according to the user's changing sitting posture, allowing the user's waist or back to be more comfortably supported.

[0055] In some embodiments, an elastic buffer (not shown) may be connected between the spherical hinge 6 and the chair back unit. The elastic buffer may be a spring, elastic plastic, soft rubber, or the like, providing a cushioning effect when the user leans against the chair back unit. Furthermore, the spherical hinge 6 may be connected to the chair back unit not only at all four sides of the chair back unit but also in the center of the chair back unit to accommodate the adjustment range requirements of chairs of different sizes.

[0056] In some embodiments, the chair back unit of the chair back unit support structure can be a Figure 9 As shown, the spherical hinges provided on the two mounting bases are connected to the two sides of the independent chair back unit respectively, and the chair back unit can be swung and adjusted in pitch angle relative to the mounting base, and can also be adjusted to the left or right at the same time. For another example, the chair back unit support structure of the present invention can also have three or four chair back units, respectively as shown in FIG. Figure 10 and Figure 11As shown, the spherical hinges of the two mounting seats are respectively connected to the left back unit and the right back unit, and an elastic member is used to connect one or two back units between the left back unit and the right back unit. The elastic member can be an elastic sheet, a spring, a leaf spring, a torsion spring, a tension spring or any other element with elastic function, which is not limited here, so that each back unit can be bent to a certain angle relative to each other and have a certain elasticity, which can better cooperate with the adjustment of the support structure and wrap the user's waist or back. In addition, multiple back units can be connected to the same spherical hinge, and the multiple back units are interconnected by an elastic mechanism, and the spherical hinge is connected to one of the back units. For example Figure 12 , there are four backrest units, and the left and right spherical hinges are connected to two backrest units respectively. The two backrest units are connected by an elastic sheet 10, while the two adjacent backrest units of the left and right spherical hinges are not connected. In addition to being connected to each other by elastic sheets, multiple backrest units can also be hinged using a rotating shaft 11, or a mixed connection of the rotating shaft and the elastic sheet. When the outer side of a backrest unit is connected to another backrest unit by a rotating shaft or an elastic sheet, compared with simply making the backrest unit into a U-shape or L-shape, it can wrap the user's waist or back more flexibly from the side of the user. In combination with the support structure of the backrest unit, especially by reducing the left and right spacing and the rotation adjustment, it not only increases the support range, but also can achieve the comfortable effect of holding the waist or back or wrapping the waist / back.

[0057] In some embodiments, only one set of seat back support units may be mounted on the seat frame, such as Figure 13 As shown, support both the backrest and lumbar, or support only the lumbar or back separately (by installing only under the bracket (such as Figure 14 As shown in the figure or above), two, three or more groups of chair back support units can also be installed to provide more targeted support for the waist, backrest or waist, shoulders and backrest. The present invention provides a chair back, such as Figure 15 As shown, two upper and lower seat back unit support structures are mounted on the seat frame, providing support for the back and waist, respectively. Each seat back unit support structure can be independently or jointly connected to the seat frame via an adjustable bracket 12 that can be adjusted fore and aft or up and down, further increasing the range of adjustment for both fore and aft and for height.

[0058] Here are some specific operation methods, including but not limited to: Figure 16 As shown, a set of chair back unit support structures are rotated diagonally upward to better support the waist / back, the spacing is adjusted and the inward rotation is adjusted to better wrap the waist / back, and the front and back are adjusted to shorten the distance between the unit and the waist / back to adapt to the user's sitting posture. Including but not limited to Figure 17-18As shown, the backrest unit support structure mounted above the seat frame is adjusted for height and inward rotation to accommodate height and back curves, and the spacing is adjusted to accommodate back width. Meanwhile, the backrest unit support structure mounted below the seat frame is adjusted for height, upward rotation, inward rotation, and spacing and fore-aft adjustment to accommodate the user's waist position and width, providing effective, tailored, and strong support. Furthermore, each backrest unit support structure can be adjusted individually (for example, users with uneven shoulders or those requiring a special sitting posture can keep the left backrest unit stationary while the right backrest unit is raised or lowered separately). Several units can also be adjusted simultaneously to meet the diverse support needs of users with different body shapes and sitting postures.

[0059] A chair back has the chair back unit support structure and has all the beneficial effects of the chair back unit support structure of the utility model.

[0060] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the practical concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention. The reference to "embodiment" in this article means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that, in the absence of conflict, the embodiments described herein can be combined with other embodiments, and the embodiments of the present invention and the features in the embodiments can be combined with each other.

Claims

1. A seat back unit support structure, characterized in that: The invention comprises a support arm (1) whose middle portion is connected to the seat, wherein the support arm (1) is hingedly mounted with a spherical hinge component (6) that can move up and down relative to the support arm, and a third limiting component (7) for clamping the spherical hinge component, wherein the spherical hinge component is also connected to one or more chair back units.

2. The seat back unit support structure according to claim 1, wherein: Mounting seats (2) are mounted at both ends of the support arm (1) and can be moved relatively closer or farther away in the transverse direction of the support arm. A first position-limiting member (3) is provided in the mounting seat (2) for fixing the mounting seat at any position of the support arm. The spherical hinge (6) is hingedly mounted on the mounting seat for upward and downward movement. A third position-limiting member (7) is provided on the mounting seat.

3. The seat back unit support structure according to claim 2, wherein: The first limiting member (3) comprises an elastic limiter (301) provided in the mounting seat, and a plurality of limit slots (101) are provided at intervals laterally at the end of the support arm (1), with the end of the limiter abutting against the limit slot.

4. The seat back unit support structure according to claim 3, wherein: A clamping block (201) movable along the support arm is detachably mounted in the mounting seat (2). A placement groove (202) for placing a limiter (301) is provided at a position of the clamping block relative to the limiting groove. The limiter compresses a spring disposed in the placement groove so that the end of the limiter abuts against the limiting groove.

5. The seat back unit support structure according to claim 2, wherein: The mounting seat is also provided with a sliding member (4) that moves forward and backward relative to the mounting seat, and a second limiting member (5) for fixing the sliding member at any position in the mounting seat. The sliding member (4) is hingedly mounted with a spherical hinge member (6) that can move up and down relative to the sliding member, and a third limiting member (7) for clamping the spherical hinge member. The spherical hinge members are respectively connected to the chair back units (8, 9).

6. The seat back unit support structure according to claim 5, wherein: The sliding member (4) is a sliding shell that is sleeved on the mounting seat (2) and can move forward and backward.

7. The seat back unit support structure according to claim 5, wherein: The second limiting member (5) includes a button (501) extending from one side of the sliding member and a slider (502) arranged in the mounting seat opposite to the button, the button and the slider are connected by a compression spring, a sliding groove (203) for the slider to slide back and forth is arranged on the inner side of the mounting seat (2), and extended protruding clamping protrusions (503) are arranged on the upper and lower sides of the button (501), and a plurality of clamping grooves (204) are arranged at intervals on the mounting seat (2) on the side opposite to the sliding groove. The middle parts of the plurality of clamping grooves are connected to form a window for the button to pass through. Pressing the button causes the clamping protrusion to slide out of the clamping groove. After moving the sliding member, releasing the button causes the clamping protrusion to extend into another clamping groove.

8. The seat back unit support structure according to claim 5, wherein: The third limiting member (7) comprises an abutting block (701) movably mounted on the sliding member and a pressing block (702) supporting the limiting abutting block. The pressing block is movably mounted on the side of the sliding member via a spring (707). Pressing the pressing block frees up a movable space on one side of the abutting block.

9. The seat back unit support structure according to claim 8, wherein: A plurality of circular limiting grooves (703) adapted to the hinge joint of the spherical hinge are vertically spaced apart on two opposite sides of the abutment block and the sliding member.

10. The seat back unit support structure according to claim 9, wherein: The surface of the hinge head or the circular limiting groove of the spherical hinge is provided with a rough surface for increasing friction.

11. The seat back unit support structure according to any one of claims 8 to 10, characterized in that: The abutment block is provided with protruding blocks (704) extending from the upper and lower ends thereof, and the sliding member is provided with a groove (705) for limiting the movement of the protruding blocks.

12. The seat back unit support structure according to claim 8, wherein The corner of the pressing block close to the abutting block is provided with an inclined edge (706).

13. The seat back unit support structure according to any one of claims 1 to 3, characterized in that: The supporting arm is elastic.

14. The seat back unit support structure according to any one of claims 1 to 10 or 12, characterized in that: The plurality of seat back units are connected to each other via an elastic mechanism, and the spherical hinge is connected to one of the seat back units.

15. A chair back, characterized in that: The seat back has the seat back unit support structure as recited in any one of claims 1 to 14.

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