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 base connected with a chair, the base is provided with two support arms and a first limiting piece, the two support arms can move towards each other or away from each other along the transverse direction, the first limiting piece is used for fixing the support arms at any position of the base, and the end part of each support arm is connected with one or more chair back units. The chair back unit is installed on the two movable supporting arms, no matter the body shape of a user is fat or thin, the distance between the chair back unit can be adjusted in the mode that the chair back unit is relatively close to or away from the chair back unit according to the body shape of the user, the chair back unit can be better attached to the waist or the back of the user, and therefore the flexible supporting effect is provided, and the comfort of the human body is improved. Besides, the user can directly pull the chair back units or the support arms, so that the distance between the chair back units can be adjusted, and the operation is convenient.

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 back is crucial for maintaining good sitting posture. It must support not only the lower back (the lumbar support) but also the entire back (the backrest). Early designs often incorporated the chair back into the frame, providing only basic back support and failing to adjust to the curves of different body types. This lack of flexibility prevented a close fit, resulting in suboptimal support.

[0003] With the development of technology, chair back designs have begun to adopt a separate structure, that is, an independent lumbar support and backrest. In addition, there has also been a development from a single lumbar support / backrest to a left and right dual-unit design, such as a double lumbar support or a double backrest. This dual-unit design can provide support from both sides, which can more effectively disperse the pressure on the back or waist and provide more comprehensive support compared to a single-unit design. However, this design still has its limitations. Because everyone's body shape is different, including fatness, thinness, width of the back or waist, etc., even if a dual-unit or more-unit design is adopted, if these units are fixed, they cannot fully adapt to each person's specific body shape. This fixity limits the adaptability of the chair, making it impossible for the chair back to dynamically adjust according to the shape and curve of the user's back or waist, and thus unable to provide better fit and flexible support. 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 size of a 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 base connected to the seat, the base is equipped with two support arms that can move relatively closer or farther left and right in the lateral direction, and a first limiting member for fixing the support arms at any position of the base, and the ends of the support arms are connected to one or more chair back units.

[0006] The chair back unit support structure is such that the chair back unit is installed on two movable arms. Regardless of whether the user is fat or thin, the chair back unit can be adjusted to a relatively close or far distance according to the user's body shape, so as to better fit the user's waist or back, thereby providing flexible support effects and improving human comfort.

[0007] As a preferred solution of the present invention, the relatively distant ends of the two arms are further provided with a mounting seat, the mounting seat is provided with 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 on 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 at any position on the sliding member, and the spherical hinges are also connected to the chair back units respectively.

[0008] As a preferred solution of the present invention, the base is provided with a transversely arranged slideway, and one end of the support arm is extended into the slideway and placed in the slideway for transverse left and right movement.

[0009] As a preferred solution of the present invention, a slide is horizontally provided in the middle of the base, a long strip window for the slide to pass through is horizontally provided at one end of the support arm, and a pressure block for limiting the left and right movement of the support arm on the base is detachably mounted on the slide, and the support arm is located at the edge of the long strip window and is recessed to form a sliding cavity for accommodating the pressure block. The first limiting component includes an elastic limiter installed on the pressure block, and a plurality of limit grooves are horizontally spaced at the end of the support arm, and the end of the limiter is against the limit groove.

[0010] As a preferred solution of the present invention, the pressure block is provided with a placement groove for placing the limiter, the limiter compresses a spring arranged in the installation groove, and a plurality of limit grooves are arranged at laterally intervals on the inner upper side or the inner lower side of the sliding cavity.

[0011] As a preferred solution of the present invention, a gear and a rotating shaft for installing the gear are provided in the middle of the base, and a rack portion meshing with the gear is provided at the end of the support arm. A synchronization cover for limiting the left and right movement of the support arm on the base can also be detachably installed on the rotating shaft. The first limiting member includes an elastic limiter installed above or below the rack portion, and a plurality of limit grooves are provided at laterally spaced intervals on the side of the rack portion, and the end of the limiter is against the limit groove.

[0012] As a preferred solution of the present invention, a mounting groove for placing a limiter is provided on the base located above or below the rack portion. The limiter compresses a spring arranged in the mounting groove, and the limiter passes through the side of the mounting groove and abuts against the limit groove.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] As a preferred solution of the present invention, the support arm is elastic.

[0021] As a preferred solution of the present invention, the multiple chair back units are connected to each other via an elastic mechanism, and the end of the support arm is connected to one of the chair back units.

[0022] 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

[0023] Figure 1 This is a schematic diagram of a first embodiment of a chair back unit support structure.

[0024] Figure 2 The figure is an exploded diagram of a first embodiment of a seat back unit support structure.

[0025] Figure 3This is a schematic structural diagram of the first limiting member and the second limiting member of Example 1.

[0026] Figure 4 This is a schematic structural diagram of the third limiting member of Example 1.

[0027] Figure 5 A side view of an embodiment of a chair back unit support structure.

[0028] Figure 6 for Figure 5 Cross-sectional view along the AA direction.

[0029] Figure 7 This is a schematic diagram of a second embodiment of a chair back unit support structure.

[0030] Figure 8 This is an exploded schematic diagram of a second embodiment of a seat back unit support structure.

[0031] Figure 9 Schematic diagram of the installation structure of four seat back units.

[0032] Figure 10 Schematic diagram of the installation structure for installing multiple seat back units on a seat bracket.

[0033] Figure 11 This is a schematic diagram of the structure of installing multiple groups of seat back units on the seat bracket.

[0034] Figure 12 This is a schematic diagram of the installation structure of two sets of seat back unit support structures on the bracket.

[0035] Figure 13 Schematic diagram of the rotation change of the seat back unit in the top view direction.

[0036] Figure 14 Schematic diagram of the rotation change of the seat back unit in the front view direction.

[0037] Figure 15 Schematic diagram of the rotation change of the seat back unit when viewed from the side. DETAILED DESCRIPTION

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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. Example 1

[0042] like Figure 1-6 As shown, a chair back unit support structure includes a base 1 connected to a seat, the base is equipped with two arms 2 that can move relatively closer or farther left and right in a lateral direction, and a first limiter 3 for fixing the arms at any position of the base, and the ends of the arms are connected to the chair back unit. The chair back unit can be a lumbar pillow for supporting the waist, or a backrest for supporting the back. The chair back unit is installed on two movable arms. Regardless of whether the user is fat or thin, or whether the user needs tighter support or looser space, the chair back unit can adjust the distance relatively closer or farther according to the needs of the user, so as to better fit the user's waist or back, thereby providing flexible support and improving human comfort.

[0043] The two arms are provided with mounting bases 4 at their distal ends. The mounting bases are equipped with a sliding member 5 that moves forward and backward relative to the mounting base, and a second stopper 6 for securing the sliding member at any position on the mounting base. The sliding member 5 is hingedly mounted with a spherical hinge 7 that can move up and down relative to the sliding member, and a third stopper 8 for clamping the spherical hinge at any position on the sliding member. The spherical hinges are also connected to backrest units 9 and 10, respectively. The backrest units utilize a combination of spherical hinges and sliding members to achieve multi-dimensional free adjustment. Specifically, the backrest units are secured to the sliding member via spherical hinges, allowing the left and right backrest units to freely rotate and tilt to any angle to accommodate and conform to the user's waist or back curve. This allows the backrest units to tightly wrap around the user's body, providing personalized support. Furthermore, the coordination of the spherical hinge and the third stopper allows the backrest units to be adjusted vertically to accommodate users of different heights. In addition, the cooperation of the sliding member and the second limiting member allows the backrest unit to be adjusted in the fore-aft direction, further enhancing the adaptability of the backrest unit. The cooperation of the support arm and the first limiting member enables the backrest unit to move along the base, thereby adjusting the spacing of the backrest units, whether tighter support or looser space is required. The backrest unit support structure can better adapt to the waist and back curves of different users by achieving multiple degrees of freedom of adjustment, including the spacing, fore-aft, up-and-down, and rotation angle of the backrest unit, providing flexible and effective support, significantly improving sitting comfort and ergonomics.

[0044] The base 1 is provided with a transversely arranged slide 101, and one end of the support arm is inserted into the slide to move horizontally left and right. The support arm is inserted into and embedded in the slide to better move left and right relative to the base.

[0045] A slide 102 is provided transversely in the middle of the base 1, a long strip window 201 for the slide 102 to pass through is provided transversely at one end of the support arm 2, and a pressure block 202 for limiting the left and right movement of the support arm on the base is detachably mounted on the slide, the edge of the support arm 2 is recessed at the edge of the long strip window to form a sliding cavity 203 for accommodating the pressure block, the first limiting member 3 includes a limiter 301 with elasticity installed on the pressure block, and a plurality of limiting grooves 204 are provided transversely at intervals at the end of the support arm 2. The end of the actuator rests in the limit slot; the pressure block 202 is provided with a placement slot 205 for placing the limiter 301. The limiter compresses a spring located in the installation slot, and a plurality of limit slots 204 are laterally spaced apart on the inner upper side or inner lower side of the slide cavity; further, a plurality of limit slots are laterally spaced apart on both the inner upper side and the inner lower side of the slide cavity, and there are two limiters. A spring is provided between the two limiters, so that the two limiters rest in the limit slots on the inner upper side and the inner lower side of the slide cavity, respectively. When the distance between the two seat back units needs to be adjusted, the support arm moves laterally along the base and slides the limiter out of the limit slot until it moves to the next limit slot. The limiter will then rest in the limit slot again to form a position, thus achieving independent left and right adjustment of the seat back unit spacing. The user can directly pull the seat back unit or the support arm to adjust the distance between the left and right seat back units, which is convenient to operate.

[0046] The sliding member 5 is a sliding shell that is sleeved on the mounting seat and can move forward and backward. Specifically, the sliding shell is a shell that is sleeved on the mounting seat. The mounting seat is provided with a corresponding inner side wall, and the shell and the inner side wall of the mounting seat are fitted and moved.

[0047] The second stopper 6 includes a button 601 extending from one side of the slider and a slider 602 disposed within the mounting seat opposite the button. The button and the slider are connected by a compression spring. A slot 401 is disposed within the mounting seat 4 for the slider to slide back and forth. Extended protrusions 603 are disposed on the upper and lower sides of the button 601. Multiple slots 402 are disposed transversely and spaced apart on the mounting seat 4 opposite the slot. The central 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 extended protrusion of the button to slide out of the slot, the slider can be moved relative to the mounting seat, and the slider drives the button to move to the next slot to achieve positioning.

[0048] The third limiting member 8 includes an abutment block 801 movably mounted on the sliding member and a pressing block 802 that supports the limiting abutment block. The pressing block is movably mounted on the side of the sliding member via a spring 807. 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.

[0049] The abutment block and the sliding member are vertically spaced on two opposite sides thereof and are provided with a number of circular limiting grooves 803 adapted to the hinge joint of the spherical hinge. The circular limiting grooves increase the contact area with the hinge joint of the spherical hinge, making it easier to clamp and fix the hinge at any angle. When the spherical hinge is adjusted up and down and moves to the next circular limiting groove, the abutment block will again abut against the spherical hinge to form a positioning.

[0050] 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.

[0051] The abutment block is provided with protruding blocks 804 extending from the upper and lower ends, and the sliding member is provided with grooves 805 for limiting the movement of the protruding blocks, so that the abutment block can move more stably on the sliding member.

[0052] The pressing block has an angled edge 806 at the corner near the abutment block, allowing the abutment block to abut the edge at its midpoint 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.

[0053] The support arm 2 is elastic and has adaptive deformation and rebound functions. The elasticity of the support arm can elastically support the user's waist or back. The chair back units on both sides form a pair of hands that 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.

[0054] In some embodiments, an elastic buffer (not shown) may be connected between the spherical hinge 7 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 7 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. Example 2

[0055] like Figure 7 and Figure 8As shown, the difference from the first embodiment is that the base 1 is provided with a gear 103 and a rotating shaft 104 for mounting the gear in the middle, and the end of the arm 2 is provided with a rack portion 206 engaged with the gear. Specifically, the rack portions of the two arms are staggered up and down and engaged with the gear; the rotating shaft is also detachably provided with a synchronization cover 105 for limiting the left and right movement of the arm on the base, the first limiter 3 includes an elastic limiter 301 installed above or below the rack portion, and the side of the rack portion is provided with a plurality of support arms. Several stop slots 204 are spaced laterally apart, with the ends of the stoppers resting in the slots. A mounting slot 205 for the stopper 301 is provided on the base, located above or below the rack. The stopper compresses a spring within the mounting slot, and the stopper extends through the side of the mounting slot and rests against the slot. Furthermore, mounting slots for the stopper are provided on both the bases above and below the rack. Two stoppers are positioned within the mounting slots and rest against the stopper by compressing a spring. Two support arms mesh with the gears via the rack. To adjust the spacing between the two seatback units, simply pull one of the seatback units, driving the support arms laterally along the base, simultaneously squeezing the stopper out of the current slot until it slides into the next slot. Once the stopper is positioned in the new slot, the left and right seatback units adjust their spacing synchronously. When one side of the seat back unit moves, the other side of the seat back unit automatically moves in the opposite direction, allowing both sides to move closer or farther apart at the same time. This synchronous adjustment mechanism not only speeds up the adjustment process, but also makes the operation more convenient.

[0056] In some embodiments, multiple backrest units can be connected to the same spherical hinge. The multiple backrest units are connected to each other through elastic mechanisms, and the spherical hinge is connected to one of the backrest units. The elastic mechanism 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. For example, there can be four backrest units, such as Figure 9, its left and right spherical hinges are respectively connected to two backrest units, and the two backrest units are hinged by a rotating shaft 11, and a torsion spring 12 (which can be a single torsion spring or a double torsion spring) is installed in the rotating shaft. In this way, the backrest units can be bent to a certain angle relative to each other and have a certain elasticity, so as to better wrap the user's waist or back. In addition to being connected to each other through a rotating shaft, multiple backrest units connected to the same spherical hinge can also be connected by elastic sheets instead of rotating shafts, or by a mixed connection of rotating shafts and elastic sheets. 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, the comfortable effect of hugging the waist or back, such as waist / back or waist / back wrapping, can be achieved. Figure 10 As shown, four seat back units are used in the lumbar area to increase the adjustment and support range, allowing the lumbar pillow to fit the waist more closely.

[0057] In some embodiments, only one set of seat back support units may be installed on the seat frame to support both the backrest and the lumbar region, or only support the lumbar region or the back region separately (by installing only below or above the frame). Alternatively, two, three or more sets of seat back support units may be installed to provide more targeted support for the lumbar region, the backrest, or the lumbar region, shoulders, and backrest. Figure 11 As shown, the seat frame is equipped with three sets of upper, middle and lower seat back unit support structures, which support the shoulders, waist and backrest respectively; Figure 12 As shown, two upper and lower seat back unit support structures are mounted on the seat frame, supporting the back and waist, respectively. Of course, each seat back unit support structure can be connected to the seat frame independently or together via an adjustable bracket 13 that can be raised or lowered, or adjusted fore and aft, to further increase the range of height adjustment and fore and aft adjustment.

[0058] Here are some specific operation methods, including but not limited to: Figure 13 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 change the distance between the unit and the waist / back to adapt to the user's sitting posture or waist / back curve. Including but not limited to Figure 14-15As shown, the backrest unit support structures mounted above the seat frame are adjusted for height and curve, and their spacing is adjusted to accommodate back width. Meanwhile, the backrest unit support structures mounted below the seat frame are adjusted for spacing, fore-and-aft, height, inward rotation, and upward rotation to accommodate the user's waist width, position, and curve, providing effective, tailored, and strong support. Furthermore, each backrest unit support structure can be adjusted individually (for example, for users with uneven shoulders, the left backrest unit can remain stationary while the right one is raised or lowered) or 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 base (1) connected to a seat, the base being provided with two arms (2) which can move relatively closer or farther to the left and right in a transverse direction, and a first position-limiting member (3) for fixing the arms at any position of the base, the ends of the arms being connected to one or more chair back units.

2. The seat back unit support structure according to claim 1, wherein: The ends of the two arms that are relatively far away from each other are also provided with a mounting seat (4), the mounting seat is provided with a sliding member (5) that can move forward and backward relative to the mounting seat, and a second limiting member (6) for fixing the sliding member at any position on the mounting seat, the sliding member (5) is hingedly mounted with a spherical hinge member (7) that can move up and down relative to the sliding member, and a third limiting member (8) for clamping the spherical hinge member at any position on the sliding member, and the spherical hinge member is also connected to the chair back unit (9, 10) respectively.

3. The seat back unit support structure according to claim 1, wherein: The base (1) is provided with a slideway (101) arranged transversely, and one end of the support arm is extended into the slideway and placed in the slideway for transverse left-right movement.

4. The seat back unit support structure according to any one of claims 1 to 3, characterized in that: A slide (102) is laterally provided in the middle of the base (1), a long strip window (201) for the slide (102) to pass through is laterally provided at one end of the support arm (2), and a pressure block (202) for limiting the left and right movement of the support arm on the base is detachably mounted on the slide, the edge of the support arm (2) located at the long strip window is recessed to form a slide cavity (203) for accommodating the pressure block, the first limiting member (3) includes an elastic limiter (301) installed on the pressure block, and a plurality of limit grooves (204) are laterally spaced at the end of the support arm (2), and the end of the limiter is against the limit groove.

5. The seat back unit support structure according to claim 4, wherein: The pressing block (202) is provided with a placement groove (205) for placing a limiter (301), and the limiter compresses a spring arranged in the installation groove. A plurality of limit grooves (204) are arranged at intervals on the inner upper side or the inner lower side of the sliding cavity.

6. The seat back unit support structure according to any one of claims 1 to 3, characterized in that: A gear (103) and a rotating shaft (104) for mounting the gear are provided in the middle of the base (1); a rack portion (206) meshing with the gear is provided at the end of the support arm (2); a synchronous cover (105) for limiting the left and right movement of the support arm on the base can also be detachably mounted on the rotating shaft; the first limiting member (3) includes an elastic limiter (301) mounted above or below the rack portion; a plurality of limit slots (204) are provided at intervals on the side of the rack portion, and the end of the limiter abuts against the limit slot.

7. The seat back unit support structure according to claim 6, wherein: A mounting groove (205) for accommodating a limiter (301) is provided on a base located above or below the rack portion. The limiter compresses a spring arranged in the mounting groove, and the limiter passes through the side of the mounting groove and abuts against the limiter groove.

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

9. The seat back unit support structure according to claim 2, wherein: The second limiting member (6) includes a button (601) extending from one side of the sliding member and a slider (602) arranged in the mounting seat opposite to the button, the button and the slider are connected by a compression spring, a sliding groove (401) for the slider to slide back and forth is arranged on the inner side of the mounting seat (4), and extended protruding clamping protrusions (603) are arranged on the upper and lower sides of the button (601), and a plurality of clamping grooves (402) are arranged at intervals on the mounting seat (4) 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.

10. The seat back unit support structure according to claim 2, wherein: The third limiting member (8) comprises an abutting block (801) movably mounted on the sliding member and a pressing block (802) supporting the limiting abutting block. The pressing block is movably mounted on the side of the sliding member via a spring (807). Pressing the pressing block frees up a movable space on one side of the abutting block.

11. The seat back unit support structure according to claim 10, wherein: A plurality of circular limiting grooves (803) adapted to the hinge joints of the spherical hinge are vertically spaced apart on two opposite sides of the abutment block and the sliding member.

12. The seat back unit support structure according to claim 11, 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.

13. The seat back unit support structure according to claim 10, wherein: The abutment block is provided with protruding blocks (804) extending from the upper and lower ends thereof, and the sliding member is provided with a groove (805) for limiting the movement of the protruding blocks.

14. The seat back unit support structure according to claim 10, wherein: The corner of the pressing block close to the abutting block is provided with an inclined edge (806).

15. The seat back unit support structure according to any one of claims 1 to 3, 5 or 7 to 14, characterized in that: The support arm (2) is elastic.

16. The seat back unit support structure according to any one of claims 1 to 3, 5 or 7 to 14, characterized in that: The plurality of seat back units are connected to each other through an elastic mechanism, and the end of the support arm is connected to one of the seat back units.

17. 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 16.

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