A linkage for adjusting an office chair

Abstract

This utility model belongs to the field of office chair technology, specifically relating to a linkage-adjustable office chair, including a base, a fixed plate, a lumbar support, a lumbar support mounting assembly, a seat, a seat mounting assembly, and a linkage assembly. The base is connected to the fixed plate, and the lumbar support mounting assembly is connected between the lumbar support and the fixed plate. The lumbar support mounting assembly includes at least one first mounting part slidably connected to the fixed plate. The seat mounting assembly includes two lower slide rails and an upper slide rail. The linkage assembly includes a mounting rod disposed between the two upper slide rails, an extension rod connected to the first mounting part and slidably connected to the fixed plate, a first pulley disposed on the mounting rod, a second pulley disposed on the extension rod, a guide wheel disposed on the base or fixed plate, and a drive rope with one end connected to the first pulley and the other end passing through the guide wheel and wound around the second pulley. The purpose of this utility model is to meet the need for lowering the lumbar support point in different sitting postures, especially in a reclining posture.

Description

Technical Field

[0001] This utility model belongs to the field of office chair technology, specifically relating to a linkage-adjustable office chair. Background Technology

[0002] Office chairs refer to various types of chairs provided for convenience during daily work and social activities. As a key module of office chairs, lumbar support effectively alleviates degenerative loads on the lumbar spine through biomechanical intervention, and its technological development is evolving from simple support to dynamic support.

[0003] The patent document CN218219649U discloses a chair with an adjustable backrest angle. An adjustable bracket is installed between the seat cushion and the backrest. An adjustment mechanism is installed inside the adjustable bracket. The adjustment mechanism includes a square opening inside the adjustable bracket, a movable block inside the square opening, a threaded rod movably connected inside the movable block, a button block fixedly connected to the rear end of the threaded rod, and a lumbar support fixedly connected to the front end of the threaded rod. By pressing two sets of control blocks together to release the restriction on the movable block, the lumbar support can be moved to achieve position adjustment. Furthermore, by rotating the button block, the front lumbar support is pushed forward, thereby adjusting the lumbar support.

[0004] However, the device still has at least the following problems: it cannot adjust the lumbar support in real time when using the chair, making it difficult to adapt to changes in sitting posture during use. Utility Model Content

[0005] To address the aforementioned problems, the purpose of this utility model is to provide a linkage-adjustable office chair, aiming to improve the dynamic support capability of the lumbar pillow and meet the needs of different sitting postures, especially the need to lower the lumbar support point in a reclining posture.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] A linkage adjustable office chair includes a base, a fixed plate, a lumbar pillow, and a lumbar pillow mounting assembly. The base is connected to the fixed plate, and the lumbar pillow mounting assembly is connected between the lumbar pillow and the fixed plate. The lumbar pillow mounting assembly includes at least one first mounting part that is slidably connected to the fixed plate.

[0008] It also includes a seat plate, a seat plate mounting assembly, and a linkage assembly, wherein the seat plate mounting assembly is connected between the base and the seat plate;

[0009] The seat plate mounting assembly includes two lower slide rails mounted on the base and arranged opposite to each other, and two upper slide rails slidably connected to the lower slide rails and connected to the seat plate;

[0010] The linkage assembly includes a mounting rod disposed between the two upper slide rails, an extension rod connected to the first mounting part and slidably connected to the fixed plate, a first spool disposed on the mounting rod, a second spool disposed on the extension rod, a guide wheel disposed on the base or fixed plate, and a drive rope with one end connected to the first spool and the other end passing through the guide wheel and wound around the second spool.

[0011] When the seat plate moves away from the fixed plate, the drive rope drives the first mounting part to approach the base along the first direction D1.

[0012] As a further preferred embodiment of the present invention, a first elastic member is provided between the first mounting part and the fixed plate, and the first elastic member has a tendency to cause the first mounting part to move in the opposite direction of the first direction D1.

[0013] As a further preferred embodiment of this utility model, the fixing plate is provided with an installation groove on the side near the lumbar pillow and a sliding groove on the side away from the lumbar pillow that communicates with the installation groove and is slidably connected to the extension rod; the lumbar pillow mounting assembly includes an installation plate connected in the installation groove, and the installation plate is provided with a limiting sliding groove along the first direction D1; the first mounting part is provided with a limiting slider slidably connected in the limiting sliding groove, and the limiting slider is connected to the extension rod.

[0014] As a further preferred embodiment of this utility model, the number of limiting grooves is two and they are distributed in parallel, and the number of limiting sliders is correspondingly two.

[0015] As a further preferred embodiment of this utility model, the mounting plate is provided with a groove on the side away from the lumbar pillow for connecting the two limiting slides; two first fixing blocks are respectively provided on the two limiting slides and located in the groove, and a first connecting rod connected to the extension rod is provided between the two first fixing blocks.

[0016] As a further preferred embodiment of this utility model, each of the two limiting sliders is provided with two second fixing blocks located within the groove, and a second connecting rod parallel to the first connecting rod is provided between the two first fixing blocks; a fixing post is provided on the bottom surface of the groove, one end of the first elastic element is connected to the fixing post, and the other end is connected to the second connecting rod.

[0017] As a further preferred embodiment of the present invention, the first mounting portion is provided with a pulley that is connected to the surface of the mounting plate.

[0018] As a further preferred embodiment of the present invention, the lumbar pillow mounting assembly includes a second mounting portion disposed on the first mounting portion, the second mounting portion being rotatably connected to the lumbar pillow.

[0019] As a further preferred embodiment of the present invention, the lumbar pillow includes a base plate and a support pad disposed on the base plate.

[0020] As a further preferred embodiment of the present invention, a second elastic member is provided between the second mounting part and the lumbar pillow; the second elastic member causes the end of the lumbar pillow away from the base to tend to move away from the second mounting part, or causes the end of the lumbar pillow close to the base to tend to move closer to the second mounting part.

[0021] The beneficial effects of this utility model are:

[0022] This utility model, through the setting of a lumbar support mounting component, a seat mounting component, and a linkage component, can achieve a linkage effect between the seat and the lumbar support, which meets the needs of reclining sitting posture. It not only extends the seat, but also allows the lumbar support to descend synchronously, always fitting the lumbar spine. It has the advantages of being easy to use, comfortable, and highly practical.

[0023] The lumbar support of the office chair provided by this utility model can be adjusted in height and angle independently even in a standard sitting posture, which helps to relieve lumbar fatigue. Attached Figure Description

[0024] Appendix Figure 1 This is a schematic diagram of the structure of this utility model.

[0025] Appendix Figure 2 This is a cross-sectional view of the present invention from a side perspective.

[0026] Appendix Figure 3 Appendix to this utility model Figure 2 A partial schematic diagram.

[0027] Appendix Figure 4 This is a schematic diagram of the back structure of the mounting plate of this utility model.

[0028] Appendix Figure 5 This is a schematic diagram of the back structure of the first mounting part of this utility model.

[0029] Appendix Figure 6 This is a front structural diagram of the second mounting part of this utility model.

[0030] Figure description: Base 100, fixing plate 200, lumbar pillow 300, lumbar pillow mounting assembly 400, seat plate 500, seat plate mounting assembly 600, linkage assembly 700;

[0031] Mounting slot 210, sliding slot 220;

[0032] Base plate 310, support pad 320;

[0033] First mounting part 410, mounting plate 420, second mounting part 430;

[0034] Second elastic element 431, rotating rod 432, mounting post 433, abutting protrusion 434;

[0035] First elastic element 411, limiting slider 412, pulley 413;

[0036] First fixing block 412a, first connecting rod 412b, second fixing block 412c, second connecting rod 412d;

[0037] Limiting groove 421, groove 422, fixing post 422a;

[0038] Lower slide rail 610, upper slide rail 620;

[0039] Mounting rod 710, extension rod 720, first spool 730, second spool 740, guide wheel 750, drive rope 760. Detailed Implementation

[0040] In the description of this utility model, it should be understood that the terms "upper", "lower", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use, or the orientation or positional relationship that is commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0041] Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0042] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, terms such as "set" and "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0043] As attached Figure 1 ~Appendix Figure 6 As shown, this embodiment provides a linkage adjustable office chair, including a base 100, a fixing plate 200, a lumbar pillow 300, a lumbar pillow mounting assembly 400, a seat plate 500, a seat plate mounting assembly 600, and a linkage assembly 700.

[0044] The base 100 is connected to the fixing plate 200, and the lumbar pillow mounting assembly 400 is connected between the lumbar pillow 300 and the fixing plate 200. The lumbar pillow mounting assembly 400 includes at least one first mounting part 410 that is slidably connected to the fixing plate 200.

[0045] The seat mounting assembly 600 connects the base 100 and the seat plate 500. The seat mounting assembly 600 includes two lower slide rails 610 mounted on the base 100 and arranged opposite each other, and two upper slide rails 620 slidably connected to the lower slide rails 610 and connected to the seat plate 500. The upper slide rails 620 and lower slide rails 610 can adopt existing structures, such as two nested U-shaped structures slidably connected. It is worth noting that the upper slide rails 620 should protrude beyond the lower slide rails 610 by a certain height, and this height should be sufficient to accommodate the installation of the mounting rod 710, the first pulley 730, and the drive rope 760. A stop should be provided on the inner bottom surface of the lower slide rail 610 on the side away from the fixed plate 200 to prevent the upper slide rail 620 from disengaging.

[0046] The linkage assembly 700 includes a mounting rod 710 disposed between two upper slide rails 620, an extension rod 720 connected to the first mounting part 410 and slidably connected to the fixing plate 200, a first spool 730 disposed on the mounting rod 710, a second spool 740 disposed on the extension rod 720, a guide wheel 750 disposed on the base 100 or the fixing plate 200, and a drive rope 760 with one end connected to the first spool 730 and the other end passing through the guide wheel 750 and wound around the second spool 740. The mounting rod 710 should be parallel to the base plate 500 with sufficient space between them for installing the first spool 730; the mounting rod 710 can be installed on the side of the upper slide rail 620 near the fixing plate 200 to shorten the length of the drive rope 760; the mounting rod 710 and the upper slide rail 620 can be fixed by bolting, welding, or other methods. Both the first spool 730 and the second spool 740 should have an inner loop around which the drive rope 760 is wound and a limiting disc to prevent the drive rope 760 from slipping off. The length of the drive rope 760 between the two spools should remain constant to ensure smooth operation of the linkage. The guide wheel 750 mainly serves a guiding function, allowing the drive rope 760 to smoothly turn at the guide wheel 750. The guide wheel 750 may also be equipped with a limiting disc to prevent the drive rope 760 from slipping off.

[0047] Under the action of external force, when the seat plate 500 moves in the direction away from the fixed plate 200 (second direction D2), the drive rope 760 drives the first mounting part 410 to approach the base 100 in the first direction D1 (height direction).

[0048] In a standard sitting posture, the lumbar spine contacts the lumbar support 300 and can apply external force to the lumbar support 1, allowing the lumbar support 300 to be adjusted along the first direction D1. At this time, the pressure of the buttocks on the seat plate 500 keeps the seat plate 500 in its original position (after the lumbar support 300 moves along the first direction D1, the drive rope 760 is in a slack state). Alternatively, the lumbar spine can also apply force to the lumbar support 1 to adjust it in the opposite direction of the first direction D1, in which case the drive rope 760 needs to be kept slack. The drive rope 760 can be made of common materials such as steel rope. One specific way to achieve the movement of the lumbar support 300 in the opposite direction of the first direction D1 is to make the drive rope 760 just taut when the lumbar support 300 is at its highest position; another way is to have the drive rope 760 wound around the second pulley 740 a sufficient number of times, so that the drive rope 760 is released when the lumbar support 300 moves in the opposite direction of the first direction D1.

[0049] It is worth elaborating that, given the drive rope 760 wound around the foot ring, the second pulley 740 should be equipped with an active winding mechanism for the drive rope 760 and a device that can lock the winding position of the drive rope 760. The structure for active winding can refer to the measuring tape structure in existing technology. This allows the lumbar pillow 300 to be adjusted independently of the seat plate 500, freely rising and falling in the first direction D1 or the opposite direction. The structure for locking can refer to the pin structure in existing technology. When the second pulley 740 locks the drive rope 760, it facilitates linkage between the lumbar pillow 300 and the seat plate 500.

[0050] During the posture adjustment process, when switching from a standard sitting posture to a reclining sitting posture, the buttocks apply external force to the seat plate 500, causing the seat plate 500 to move along the second direction D2. The extension rod 720 pulls the drive rope 760 (the drive rope 760 has a fixed length between the two reels), causing the extension rod 720 to pull the first mounting part 410 to move along the first direction D1, thereby lowering the lumbar pillow 300. The synchronous lowering of the lumbar pillow 300 and the lumbar spine ensures that the lumbar spine is effectively supported even in the reclining sitting posture, alleviating fatigue and injury.

[0051] As a further preferred embodiment, a first elastic member 411 is provided between the first mounting portion 410 and the fixing plate 200. The first elastic member 411 has a tendency to cause the first mounting portion 410 to move in the opposite direction of the first direction D1. This arrangement helps the lumbar pillow 300 to move in the opposite direction of the first direction D1 when the external force is removed, thus helping the lumbar pillow 300 to automatically return to its original position. The first elastic member 411 can be an existing structure such as a spring.

[0052] As a further preferred embodiment, the fixing plate 200 is provided with a mounting groove 210 on the side near the lumbar pillow 300, and a sliding groove 220 that communicates with the mounting groove 210 and is slidably connected to the extension rod 720 on the side away from the lumbar pillow 300; the lumbar pillow mounting assembly 400 includes a mounting plate 420 connected in the mounting groove 210, and the mounting plate 420 is provided with a limiting sliding groove 421 along the first direction D1; the first mounting part 410 is provided with a limiting slider 412 that is slidably connected in the limiting sliding groove 421, and the limiting slider 412 is connected to the extension rod 720.

[0053] Furthermore, there are two limiting grooves 421 arranged in parallel, and two corresponding limiting sliders 412. A groove 422 for connecting the two limiting grooves 421 is provided on the side of the mounting plate 420 away from the lumbar pillow 300; two first fixing blocks 412a are respectively provided on the two limiting sliders 412 within the groove 422, and a first connecting rod 412b connected to the extension rod 720 is provided between the two first fixing blocks 412a. Two second fixing blocks 412c are respectively provided on the two limiting sliders 412 within the groove 422, and a second connecting rod 412d parallel to the first connecting rod 412b is provided between the two first fixing blocks 412a; a fixing post 422a is provided on the bottom surface of the groove 422, and one end of the first elastic member 411 is connected to the fixing post 422a, and the other end is connected to the second connecting rod 412d. The second connecting rod 412d should be located at the lower end of the first connecting rod 412d (near the seat plate 500) to avoid interference between the first elastic element 411 and the extension rod 720. The extension rod 720 and the limiting slider 412 can be fixed by bolt connection, welding or other methods.

[0054] As a further preferred embodiment, the first mounting part 410 is provided with pulleys 413 that are connected to the surface of the mounting plate 420. The number of pulleys 413 can be two or four, which are used to reduce wear between the mounting plate 420 and the first mounting part 410, and make the movement of the lumbar pillow 300 smoother.

[0055] As a further preferred embodiment, the lumbar pillow 300 includes a base plate 310 and a support pad 320 disposed on the base plate 310. The lumbar pillow mounting assembly 400 includes a second mounting portion 430 disposed on the first mounting portion 410, and the second mounting portion 430 is rotatably connected to the lumbar pillow 300. The rotatable connection can be achieved by having two mounting plates disposed opposite each other on the surface of the second mounting portion 430 near the lumbar pillow, with a rotating rod 432 disposed between the two mounting plates, and a protrusion rotatably connected to the rotating rod 432 on the surface of the base plate 310.

[0056] Furthermore, a second elastic member 431 is provided between the second mounting part 430 and the lumbar pillow 300; the second elastic member 431 causes the end of the lumbar pillow 300 away from the base 100 to tend to move away from the second mounting part 430, or causes the end of the lumbar pillow 300 close to the base 100 to tend to move closer to the second mounting part 430.

[0057] It is worth noting that since the two installation methods described above are essentially the same, this embodiment uses the second elastic element 431 being installed on the upper side of the lumbar pillow 300 as an example. In this case, the surface of the second mounting portion 430 is provided with a mounting post 433, and a fixing point (not shown in the figure) is also provided at the base plate 310. Both ends of the second elastic element 431 are connected to the mounting post 433 and the fixing point, respectively, to provide sufficient support. The second elastic element 431 can be made of the same material as the first elastic element 411. Furthermore, the side of the second mounting portion 430 away from the mounting post 433 is provided with an abutment protrusion 434, mainly to prevent the lumbar pillow 300 from having an excessively large angle towards the seat plate 500, thus avoiding a "drooping" phenomenon.

[0058] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A linkage-adjustable office chair, comprising a base (100), a fixing plate (200), a lumbar pillow (300), and a lumbar pillow mounting assembly (400), wherein the base (100) is connected to the fixing plate (200), and the lumbar pillow mounting assembly (400) is connected between the lumbar pillow (300) and the fixing plate (200), and the lumbar pillow mounting assembly (400) includes at least one first mounting part (410) slidably connected to the fixing plate (200); characterized in that: It also includes a seat plate (500), a seat plate mounting assembly (600), and a linkage assembly (700), wherein the seat plate mounting assembly (600) is connected between the base (100) and the seat plate (500); The seat mounting assembly (600) includes two lower slide rails (610) mounted on the base (100) and arranged opposite to each other, and two upper slide rails (620) slidably connected to the lower slide rails (610) and connected to the seat plate (500). The linkage assembly (700) includes a mounting rod (710) disposed between the two upper slide rails (620), an extension rod (720) connected to the first mounting part (410) and slidably connected to the fixing plate (200), a first spool (730) disposed on the mounting rod (710), a second spool (740) disposed on the extension rod (720), a guide wheel (750) disposed on the base (100) or the fixing plate (200), and a drive rope (760) with one end connected to the first spool (730) and the other end passing through the guide wheel (750) and wound around the second spool (740). When the seat plate (500) moves away from the fixed plate (200), the drive rope (760) drives the first mounting part (410) to approach the base (100) along the first direction D1.

2. The linked adjustable office chair according to claim 1, characterized in that: A first elastic member (411) is provided between the first mounting part (410) and the fixing plate (200), and the first elastic member (411) has a tendency to make the first mounting part (410) move in the opposite direction of the first direction D1.

3. The linked adjustable office chair according to claim 2, characterized in that: The fixing plate (200) has an installation groove (210) on the side near the lumbar pillow (300) and a sliding groove (220) on the side away from the lumbar pillow (300) that communicates with the installation groove (210) and is slidably connected to the extension rod (720); the lumbar pillow mounting assembly (400) includes an installation plate (420) connected in the installation groove (210), and the installation plate (420) has a limiting sliding groove (421) along the first direction D1; the first mounting part (410) has a limiting slider (412) slidably connected in the limiting sliding groove (421), and the limiting slider (412) is connected to the extension rod (720).

4. The linked adjustable office chair according to claim 3, characterized in that: The number of limiting grooves (421) is two and they are distributed in parallel, and the number of limiting sliders (412) is two.

5. The linked adjustable office chair according to claim 4, characterized in that: The mounting plate (420) is provided with a groove (422) on the side away from the lumbar pillow (300) for connecting the two limiting slides (421); the two limiting slides (412) are respectively provided with two first fixing blocks (412a) located in the groove (422), and a first connecting rod (412b) connected to the extension rod (720) is provided between the two first fixing blocks (412a).

6. The linked adjustable office chair according to claim 5, characterized in that: Two second fixing blocks (412c) are respectively provided on the two limiting sliders (412) and located in the groove (422). A second connecting rod (412d) parallel to the first connecting rod (412b) is provided between the two first fixing blocks (412a). A fixing post (422a) is provided on the bottom surface of the groove (422). One end of the first elastic member (411) is connected to the fixing post (422a) and the other end is connected to the second connecting rod (412d).

7. The linked adjustable office chair according to claim 3, characterized in that: The first mounting part (410) is provided with a pulley (413) that is connected to the surface of the mounting plate (420).

8. The linked adjustable office chair according to claim 1, characterized in that: The lumbar support mounting assembly (400) includes a second mounting portion (430) disposed on the first mounting portion (410), and the second mounting portion (430) is rotatably connected to the lumbar support (300).

9. A linkage-adjustable office chair according to claim 8, characterized in that: The lumbar pillow (300) includes a base plate (310) and a support pad (320) disposed on the base plate (310).

10. A linkage-adjustable office chair according to claim 8, characterized in that: A second elastic member (431) is provided between the second mounting part (430) and the lumbar pillow (300); the second elastic member (431) causes the end of the lumbar pillow (300) away from the base (100) to tend to move away from the second mounting part (430), or causes the end of the lumbar pillow (300) close to the base (100) to tend to move closer to the second mounting part (430).

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