Lumbar support assembly and chair equipped therewith

Abstract

The present invention relates to a lumbar support assembly and a chair equipped therewith, comprising a pair of moving bodies provided to be movable vertically along the left and right sides of the backrest frame, and mesh pressure plates provided to be movable in the front-rear direction relative to the pair of moving bodies, which press forward the left and right ends of a backrest support mesh provided on the backrest frame to support the user's back, and the pair of mesh pressure plates provided on each of the pair of moving bodies can press the backrest support mesh at different heights and with different pressures by the user's operation, thereby providing the advantage of improving user convenience and comfort.

Description

Technical Field

[0001] The present invention relates to a lumbar support assembly and a chair including the same, and more particularly, to a lumbar support assembly and a chair including the same, which are provided so that height adjustment and depth adjustment can be performed on both left and right sides of a backrest frame, respectively, so that indirect support for a user's lumbar vertebra can be achieved through tension adjustment of a backrest support mesh without direct user contact, thereby improving the sitting feeling and comfort.

Background Art

[0002] Generally, a chair is composed of a seat part, a backrest part, and an armrest part, etc., and cushions for increasing the comfort of a seated person are provided on the seat part and the backrest part.

[0003] However, when modern people who often sit on chairs to do office work sit on chairs for a long time to perform their duties, they do not necessarily bend their waists, and tend to complain of back pain when performing their duties for a long time in such a state.

[0004] This is because when the lower spine, which takes a very gentle "C" shape, becomes relatively straight while sitting in a bent waist position for a long time, the load of the upper body is not evenly distributed over the entire spine but concentrated on the lower spine.

[0005] Consequently, conventionally, in order to prevent back pain, some people would purchase a separate zabuton or cushion and then sit with the zabuton or a small cushion against their waist to support the waist. However, such zabutons and cushions are not only not fixed to the chair but also cannot maintain a certain angle, so there is a problem that they cannot appropriately support the waist according to the movement of the user.

[0006] Recently, various lumbar support devices have been developed to address the problems mentioned above, but most of them have complex configurations, are difficult to assemble, have a large number of parts, and increase manufacturing costs.

[0007] Korean Registered Patent No. 10-1148032 (registered on May 15, 2012) (hereinafter referred to as the "prior patent") discloses a chair equipped with a conventional lumbar support device. For reference, the prior patent is a patent filed and registered by the applicant of the present invention.

[0008] The prior patent described a device comprising a fixed frame, each fixed to the backrest, and a support pad connected to the fixed frame by vertical adjustment means and horizontal adjustment means, which moves in the vertical and horizontal directions. The support pad is designed to directly support the user's back portion, which is supported by a mesh (not shown), thereby fulfilling its function.

[0009] However, the prior patent has a problem in that the support pad directly presses against the user's back, which can cause discomfort as the user directly feels the hard texture of the support pad. To alleviate this discomfort, a soft material such as sponge could be placed in front, but this is undesirable because it could cause damage due to friction with the mesh.

[0010] Furthermore, the prior patent has a problem in that, because both ends of the lumbar support device are adjusted to the same height uniformly, it is impossible to correct the posture of users with spinal disorders such as scoliosis. [Overview of the project] [Problems that the invention aims to solve]

[0011] The present invention was devised to solve the above-mentioned technical problems, and aims to provide a lumbar support assembly and a chair equipped therewith, which are designed to provide indirect lumbar support by adjusting the tension of a back support mesh without directly supporting the user's back.

[0012] Furthermore, another objective of the present invention is to provide a lumbar support assembly and a chair equipped therewith, which allows for the adjustment of the tension of the backrest support mesh at different heights and depths, by providing a pair on the left and right sides of the backrest frame, respectively, thereby enabling the correction of the body shape of users with spinal disorders such as scoliosis.

[0013] The technical problems of the present invention are not limited to those mentioned above, and other technical problems not mentioned can be clearly understood by those skilled in the art from the following description. [Means for solving the problem]

[0014] A lumbar support assembly according to one embodiment of the present invention comprises a pair of moving bodies that are movable vertically along the left and right sides of the backrest frame, and mesh pressure plates that are movable in the front-rear direction relative to the pair of moving bodies and that press forward the left and right ends of a backrest support mesh provided on the backrest frame to support the user's back, wherein the pair of mesh pressure plates provided on each of the pair of moving bodies can press the backrest support mesh at different heights and with different pressures by user operation.

[0015] Here, each of the pair of moving bodies may have a handle portion formed thereon for the user to grasp by hand, extending a predetermined length from the left end to the right end or from the right end to the left end of the backrest frame.

[0016] Furthermore, each of the pair of moving bodies may be provided with a front-to-back moving adjustment lever for moving the mesh pressure plate in the front-to-back direction, and the front-to-back moving adjustment lever may be provided so as to stop after the mesh pressure plate has been moved such that the pressure applied to the back support mesh differs at a plurality of different rotation angle points.

[0017] Furthermore, the front-to-rear moving adjustment lever is provided in a hollow form so that a guide pole, which is formed to protrude rearward from the back of the mesh pressure plate, passes through it, and a rotating cam surface may be formed on the inner circumferential surface of the hollow portion of the front-to-rear moving adjustment lever, which is formed continuously in the circumferential direction to form the plurality of different rotation angle points, but which has different separation distances from the rear end.

[0018] Furthermore, around the guide pole of the mesh pressure plate, a corresponding cam surface may be formed that is either aligned with or separated from the rotating cam surface of the front and rear moving adjustment lever, but has a different separation distance from the back surface of the mesh pressure plate.

[0019] Furthermore, the rotating cam surface and the corresponding cam surface may have multiple locking parts formed thereon, which lock the rotation of the front and rear moving adjustment lever at the different rotation angle points.

[0020] Furthermore, although the guide pole formed on the mesh pressure plate is inserted from the front to the rear of the front-to-rear moving adjustment lever, it may be engaged with the inside of the moving body by a guide screw fastened from the rear to the front of the front-to-rear moving adjustment lever in a manner that prevents it from detaching forward.

[0021] Furthermore, the front-to-back moving adjustment lever may have a lever handle that protrudes radially outward for the user to rotate with their finger.

[0022] Further, the front and rear moving adjustment lever may be rotated so that the tip of the lever handle faces inward between the left and right ends of the backrest frame.

[0023] Further, the moving body may further include a sliding block, a part of which is inserted inside the backrest frame and slides in the vertical direction, and the sliding block may be provided with a haptics block that applies a predetermined elastic force to the inner surface of the backrest frame.

[0024] Further, although the mesh pressing plates provided on the pair of moving bodies are provided inside between the left and right ends of the pair of backrest frames, they may be arranged closer to the outside than the middle part between the left and right ends.

[0025] A chair according to an embodiment of the present invention includes a backrest frame, a backrest support mesh provided on the backrest frame so as to support the user's back portion, and a lumbar support assembly provided so as to be movable in the vertical direction along the backrest frame, which presses the left and right end portions of the backrest support mesh forward, and is capable of adjusting so that the tensions of the backrest support mesh are different. The lumbar support assembly includes a pair of moving bodies provided so as to be movable in the vertical direction along the left and right sides of the backrest frame, and mesh pressing plates provided so as to be movable in the front and rear directions with respect to the pair of moving bodies, which press the left and right end portions of the backrest support mesh provided on the backrest frame so as to support the user's back portion forward. The pair of mesh pressing plates can press the backrest support mesh with different heights and different pressing forces by the user's operation.

Advantages of the Invention

[0026] According to the lumbar support assembly and the chair including the same according to an embodiment of the present invention, various effects as follows can be achieved.

[0027] First, the lumbar support assembly is provided with a pair of moving bodies and a mesh pressing plate respectively provided on the left and right sides of the backrest frame, and is configured to indirectly support the user's lumbar spine region by adjusting the tension of the mesh, thereby having the effect of improving the user's comfort and sitting feeling.

[0028] Second, it is provided with a pair of moving bodies and a mesh pressing plate, and different height adjustments and different depth adjustments are possible on the left and right sides of the backrest frame, thereby having the effect of providing a function that enables correction of the body shape (posture) of users with spinal diseases such as scoliosis.

Brief Description of the Drawings

[0029] [Figure 1] It is a front partial perspective view showing a lumbar support assembly according to an embodiment of the present invention and a chair provided with the same. [Figure 2] It is a rear partial perspective view showing a lumbar support assembly according to an embodiment of the present invention and a chair provided with the same. [Figure 3] It is a partial rear view of FIG. 2. [Figure 4] It is a perspective view showing the assembly state and operating principle of the lumbar support assembly with respect to the backrest frame. [Figure 5] It is a perspective view showing a lumbar support assembly according to an embodiment of the present invention. [Figure 6a] It is an exploded perspective view of one side and the other side showing the assembly structure of the lumbar support assembly using the lumbar guide rail with respect to the inner backrest frame among the configurations of the backrest part. [Figure 6b] It is an exploded perspective view of one side and the other side showing the assembly structure of the lumbar support assembly using the lumbar guide rail with respect to the inner backrest frame among the configurations of the backrest part. [Figure 7] It is a perspective view for explaining the operation state of the lumbar guide rail in FIGS. 6a and 6b. [Figure 8a]Figure 5 shows an exploded perspective view of the front section and an exploded perspective view of the rear section. [Figure 8b] Figure 5 shows an exploded perspective view of the front section and an exploded perspective view of the rear section. [Figure 9] This is a cross-sectional view showing how the depth of the mesh pressure plate is adjusted by rotating the front and rear moving adjustment levers, as shown in the configuration of Figure 5. [Figure 10] This is a cross-sectional view showing how the depth of the mesh pressure plate is adjusted by rotating the front and rear moving adjustment levers, as shown in the configuration of Figure 5. [Modes for carrying out the invention]

[0030] A lumbar support assembly and a chair equipped therewith according to one embodiment of the present invention will be described in detail below with reference to the attached drawings.

[0031] When assigning reference numerals to the components of each drawing, it should be noted that, as far as possible, the same component should have the same reference numeral, even if it is shown in other drawings. Furthermore, when describing embodiments of the present invention, if a detailed explanation of a related known configuration or function is deemed to hinder understanding of the embodiments of the present invention, such detailed explanation will be omitted.

[0032] In describing the components of embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc., may be used. Such terms are used to distinguish a component from other components, and the terms do not limit the nature, order, or sequence of the component. Furthermore, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by a person of ordinary skill in the art to which the present invention pertains. Terms as defined in commonly used dictionaries should be interpreted as having the meaning consistent with their meaning in the context of the relevant art, and should not be interpreted as ideal or overly formal unless explicitly defined in this application.

[0033] Figure 1 is a front perspective view showing a lumbar support assembly and a chair equipped therewith according to one embodiment of the present invention; Figure 2 is a rear perspective view showing a lumbar support assembly and a chair equipped therewith according to one embodiment of the present invention; Figure 3 is a partial rear view of Figure 2; and Figure 4 is a perspective view showing the assembly of the lumbar support assembly to the backrest frame and its operating principle.

[0034] A chair 1 according to one embodiment of the present invention, as shown in Figures 1 to 4, may include a body portion 10, a seat portion 20 horizontally positioned on the upper part of the body portion 10 for the user to sit on, leg portions 30 rotatably provided relative to the body portion 10 and rotatably supporting the body portion 10 with respect to the bottom surface which is the usable space, armrest portions 40 consisting of a right armrest 40a and a left armrest 40b extending upward from both left and right ends of the body portion 10 to support the user's arms, and a backrest portion formed to extend upward from the rear end of the body portion 10 to support the user's back, and a headrest portion 60 provided on the upper part of the backrest portion to support the user's neck or the back of the head.

[0035] Here, although not shown in detail in the drawing, the seat portion 20 may be provided so as to be able to slide in the front-rear direction relative to the body portion 10 and then be adjusted to suit the user's physical condition.

[0036] Furthermore, the legs 30 are arranged to branch out radially from a central rotation point, and each end is equipped with a roller-shaped wheel 35 at its lower end, allowing the chair 1 itself to be moved effectively on the floor, which is the workspace.

[0037] On the other hand, the backrest portion is fixed at the rear of the body portion 10 at both lower left and right ends, and its upper end can be provided so as to be tiltable by a predetermined angle in the front-rear direction with respect to one of the points at either the lower end by a tilting portion (not shown).

[0038] The backrest section may include a backrest frame 50, which is provided in a frame form with the interior mostly empty except for the frame portion, and a backrest support mesh 55 made of a woven fabric material that is joined to fill the empty interior of the backrest frame 50.

[0039] Here, the backrest frame 50, as shown in Figure 4, comprises an outer backrest frame 50A made of a highly rigid plastic material, and an inner backrest frame 50B which is connected to the front end of the outer backrest frame 50A but mediates the installation of the lumbar support assembly 100, which will be described later.

[0040] On the other hand, the armrests 40 can be configured such that a portion of the tip of the right armrest 40a and the left armrest 40b slides in the front-to-back direction, allowing the user to rest their arms in a more comfortable posture.

[0041] Furthermore, although not shown in detail in the drawings, the headrest portion 60 can be provided so that its height can be adjusted vertically to suit the user's body type. It is also obvious that the headrest portion 60 can be provided so that its upper and lower ends can rotate in the front-rear direction relative to the left-right rotation axis.

[0042] A chair 1 according to one embodiment of the present invention, as shown in Figures 1 to 4, may further include a lumbar support assembly 100 that is movable vertically along the backrest frame 50 and applies forward pressure to both the left and right ends of the backrest support mesh 55, but is adjustable so that the tension of the backrest support mesh 55 is different.

[0043] Figure 5 is a perspective view showing a lumbar support assembly according to one embodiment of the present invention; Figures 6a and 6b are exploded perspective views of one and the other side showing the assembly structure of the lumbar support assembly using a lumbar guide rail on the inner backrest frame, which is part of the backrest configuration; Figure 7 is a perspective view illustrating the operation of the lumbar guide rail in Figures 6a and 6b; Figures 8a and 8b are exploded perspective views of the front and rear of Figure 5; and Figures 9 and 10 are cross-sectional views showing the depth adjustment of the mesh pressure plate by rotating the front and rear moving adjustment lever, which is part of the configuration in Figure 5.

[0044] As shown in Figures 6a and 6b, the lumbar support assembly 100 can be mounted on the inner backrest frame 50B, which is coupled to the front end of the outer backrest frame 50A, so as to be able to slide up and down via the lumbar rail guide frame 50C.

[0045] More specifically, the inner backrest frame 50B can be screwed to the front end of the outer backrest frame 50A by a plurality of frame assembly screws 50B-S around the backrest frame 50.

[0046] The outer backrest frame 50A is provided with a screw assembly boss 50A-2 on its inside, and the inner backrest frame 50B has screw through holes 50B-3 formed in positions corresponding to the screw assembly boss 50A-2, corresponding to the installation positions of multiple frame assembly screws 50B-S. Multiple frame assembly screws 50B-S can be fastened by passing through the screw through holes 50B-3 from front to rear and fastening them to the screw assembly boss 50A-2.

[0047] On the other hand, rail guide installation grooves 50B-h can be formed in the front-rear direction at the left and right lower ends of the inner backrest frame 50B adjacent to the user's lumbar support area, where a lumbar rail guide frame 50C is provided to mediate the connection so that the lumbar support assembly 100 can slide up and down.

[0048] Here, as shown in Figures 6a and 6b, the inner backrest frame 50B may be provided with a slot end 50B-1 formed by cutting a portion of the rail guide installation groove 50B-h to the rear, so as to form a guide slot 57, which will be described later, between a portion of the rear end of the lumber rail guide frame 50C provided in the rail guide installation groove 50B-h and the inner backrest frame 50B.

[0049] Between the slot end 50B-1 of the inner backrest frame 50B and the rear end 50C-1 of the lumbar rail guide frame 50C, a guide slot 57 may be formed to provide a vertical sliding path after the lumbar support assembly 100 is inserted.

[0050] The inner side of the outer backrest frame 50A is provided with a screw assembly boss 50A-2' for screw fastening of the lumber rail guide frame 50C with guide frame assembly screws 50C-2, and the lumber rail guide frame 50C may have screw through holes 50C-3 formed therein for fastening the guide frame assembly screws 50C-2 through.

[0051] As shown in Figure 7, side guide ribs 50C-a and front and rear guide ribs 50C-b may be formed on the rear surface of the lumber rail guide frame 50C to guide the vertical sliding of the sliding block 112, which is integrally formed with the pair of moving bodies 110 described later.

[0052] The tip of the sliding block 112 may have a stepped support surface 112a and a tip support surface 112b, which are positioned to protrude forward in a stepped manner.

[0053] The step support surface 112a is locked in surface contact with the side guide rib 50C-a of the lumber rail guide frame 50C in the outward direction, preventing it from coming off to the outside, and also providing surface contact and guidance during vertical sliding.

[0054] The tip support surface 112b is in line contact with the front and rear guide ribs 50C-b of the lumber rail guide frame 50C, guiding the lumber support assembly 100 to slide naturally in the vertical direction along the forming path of the guide slot 57.

[0055] As shown in Figures 4 to 10, the lumbar support assemblies 100 can be provided in pairs (refer to the reference numerals "100A" and "100B" in the drawings) along the left and right sides of the backrest frame 50. Thus, unlike the prior patent described as an example in the "Technology Underlying the Invention" section above, the lumbar support assemblies 100 are not provided in the middle to directly support the user's back, but rather are provided adjacent to the left and right ends of the backrest frame 50, and each is provided so that its height and depth can be adjusted. In the following, although the pair of lumbar support assemblies 100A and 100B differ only in their installation direction, and the entire structure is the same shape and is connected in the same way, for the sake of explanation, only one of them will be described in detail, and the detailed description of the other will be omitted.

[0056] More specifically, the lumbar support assembly 100 may include a pair of moving bodies 110 that are movable vertically along the left and right sides of the backrest frame 50, and mesh pressure plates 120 that are movable in the front-rear direction relative to the pair of moving bodies 110 and that apply forward pressure to both the left and right ends of a backrest support mesh 55 that is provided on the backrest frame 50 to support the user's back.

[0057] The moving body 110 is provided on the inner backrest frame 50B of the backrest frame 50, and a portion of it (see "sliding block 112" described later) is provided so as to be movable a predetermined length in the vertical direction from inside the inner backrest frame 50B, while the remaining portion (see "handle portion 111" described later) is provided so as to be exposed to the outside of the inner backrest frame 50B.

[0058] In other words, the moving body 110 may be provided with a handle portion 111 for the user to grasp by hand, extending a predetermined length from the left end to the right end or from the right end to the left end of the backrest frame 50, and a sliding block 112, part of which slides vertically inside the backrest frame 50. Here, the handle portion 111 can be integrally formed with the moving body 110.

[0059] In particular, as shown in Figure 4, the inner backrest frame 50B of the backrest frame 50 may have a sliding block 112 inside and a guide slot 57 formed to guide vertical movement. As mentioned above, the guide slot 57 is formed between the inner backrest frame 50B and the lumber rail guide frame 50C which is coupled to the front end of the inner backrest frame 50B.

[0060] Here, the user can adjust the height by grasping the handle portion 111, which is formed on the moving body 110 but extends in the left-right direction on the backrest frame 50, and moving it up and down within the range in which the guide slot 57 is formed. At this time, the user adjusts the height to suit their body type, but if the user has a spinal disorder such as scoliosis, it is natural that the lumbar support assembly 100A on the right side and the lumbar support assembly 100B on the left side can be adjusted to different heights to suit the correction of their body shape.

[0061] On the other hand, the sliding block 112, which is located inside the inner backrest frame 50B of the backrest frame 50, may be equipped with a haptic block 115 that applies a predetermined elastic force to the inner surface of the backrest frame (more specifically, the outer backrest frame 50A).

[0062] The haptic block 115 is an elastic body, provided in the form of a roller, and can be elastically supported while rolling along a wave-like uneven surface 50A-3 that is continuously provided in the vertical direction on the inner surface of the outer backrest frame 50A when the moving body 110 is moved and adjusted in the vertical direction. As the haptic block 115 moves along the uneven surface 50A-3, it can provide the user with a sense of control over height adjustment through the hand that is holding it.

[0063] As shown in Figures 8 to 10, the mesh pressure plate 120 can be formed as a flat panel with a softly curved cross-section on the front so as to uniformly apply pressure over a wide area to the back of the back support mesh 55, which is generally made of a soft woven material.

[0064] Each of the pair of moving bodies 110 may be equipped with a front-to-back moving adjustment lever 130, as shown in Figures 6a and 6b, for moving the mesh pressure plate 120 in the front-to-back direction relative to the moving body 110 while it is fixed to the backrest frame 50.

[0065] Here, the front-to-back moving adjustment lever 130 may be provided to stop after the mesh pressure plate 120 has been moved such that the pressure applied to the backrest support mesh 55 differs at a number of different rotation angle points.

[0066] For example, the front and rear moving adjustment lever 130 may be provided to be rotatable by a maximum of 90 degrees in one or the other direction, but it may be provided in a manner in which the lever is locked and stopped at three different rotation angle points at 30-degree intervals including the 90-degree point, or at six points at 15-degree intervals including the 90-degree point.

[0067] Such a front-to-back moving adjustment lever 130 may be provided so that the mesh pressure plate 120 is moved so that the pressure applied to the back support mesh 55 differs at multiple different rotation angle points, and then stops. For reference, the further forward the stopped position of the mesh pressure plate 120 is moved, the greater the tension of the back support mesh 55, and the more the tensioned back support mesh 55 can support the user's back further forward.

[0068] In particular, the front and rear moving adjustment lever 130 can be provided in a hollow form so that a guide pole 121, which is formed to protrude rearward from the back of the mesh pressure plate 120, can pass through it, as shown in Figures 8a and 8b.

[0069] As shown in Figures 5 to 10, the front / rear moving adjustment lever 130 may have a lever handle 132 that protrudes radially outward for the user to rotate with their finger.

[0070] Here, the front-to-back moving adjustment lever 130 can be rotated so that the tip of the lever handle 132 faces inward between the left and right ends of the backrest frame 50. This is to prevent the user from bumping into or being interfered with by the lever protruding outward from the backrest frame 50.

[0071] As shown in Figure 8b, a rotating cam surface 133 can be formed on the inner circumferential surface of the hollow portion of the front-rear moving adjustment lever 130, which is continuously formed in the circumferential direction to form the multiple different rotation angle points described above, but which has different separation distances from the rear end.

[0072] Furthermore, as shown in Figure 8a, a corresponding cam surface 123 may be formed around the guide pole 121 of the mesh pressure plate 120, either aligned with or separated from the rotating cam surface 133 of the front-rear moving adjustment lever 130, but with a different separation distance from the back surface of the mesh pressure plate 120.

[0073] Here, the rotating cam surface 133 is provided to have a different separation distance from the rear end of the front-rear moving adjustment lever 130, while the corresponding cam surface 123 is also formed to have a different separation distance from the back surface of the mesh pressure plate 120. As a result, when the front-rear moving adjustment lever 130 is rotated in one direction, it will stop after making contact at only one of the multiple rotation angle points, and different depth adjustments of the mesh pressure plate 120 can be made at each stopping point.

[0074] In particular, the rotating cam surface 133 and the corresponding cam surface 123 may have multiple locking parts (see reference numerals "123a, 123b, 123c" in Figure 6a) that lock the rotation of the front and rear moving adjustment lever at different rotation angle points.

[0075] At each of the multiple locking points 123a, 123b, and 123c, even if the user does not apply operating force to the lever handle 132 of the front-to-back moving adjustment lever 130, the mutual contact between the rotating cam surface 133 and the corresponding cam surface 123 is locked in the rotational direction, thereby preventing the mesh pressure plate 120 from moving arbitrarily.

[0076] On the other hand, the guide pole 121 formed on the mesh pressure plate 120 is inserted from the front to the rear of the front-to-rear moving adjustment lever 130, as shown in Figures 8a and 8b. However, it can be engaged with the inside of the moving body 110 by a guide screw 170 fastened from the rear to the front of the front-to-rear moving adjustment lever 130, so as to prevent it from detaching forward.

[0077] More specifically, as shown in Figures 8a and 8b, the moving body 110 is provided with a fastening boss 114 having a through-hole 113 that penetrates in the front-rear direction, and the guide screw 170 can be inserted through the rear end of the through-hole 113 of the moving body 110 and fastened to a screw fastening hole (not shown in the drawing) provided at the tip of the guide pole 121 of the mesh pressure plate 120. Here, the outer diameter of the head of the guide screw 170 is formed to be even larger than the outer diameter of the tip of the guide pole 121, and a locking step (not shown in the drawing) is formed on the inner circumferential surface of the fastening boss 114 corresponding to the through-hole 113 of the moving body 110, which locks the frame portion corresponding to the head of the guide screw 170, thereby preventing the mesh pressure plate 120 from detaching to the outside.

[0078] The open portion of the moving body 110 corresponding to the rear end of the through-hole 113 can be shielded using the cover panel 116 and the decorative panel 117, as shown in Figures 8a and 8b.

[0079] As shown in Figure 8b, the front portion of the cover panel 116 is provided with a fixed boss 117a that protrudes forward for a predetermined length, and a restraining fastening member 140 made of an elastic material such as silicone can be screw-fastened to the front end of the fixed boss 117a by a tip screw 150.

[0080] Multiple gear-shaped elastic rings 141, which are elastically compressed by external forces, can be integrally formed on the outer circumferential surface of the restraining fastening member 140. When the cover panel 116 is inserted through the through-hole 113 of the moving body 110, the multiple elastic rings 141 of the restraining fastening member 140 are pressed tightly against the inner circumferential surface of the fastening boss 114, thereby restraining and fastening the cover panel 116.

[0081] On the other hand, a rotation guide member 160 may be interposed on the outside of the fastening boss 114 of the moving body 110 to guide the rotational movement of the front-rear moving adjustment lever 130. The rotation guide member 160 is interposed between the inner circumferential surface of the front-rear moving adjustment lever 130 and the outer circumferential surface of the fastening boss 114 of the moving body 110, and can play a role in guiding or supporting the rotational movement of the front-rear moving adjustment lever 130.

[0082] As described above, the lumbar support assembly 100 according to one embodiment of the present invention, having the above configuration, is provided in pairs on the left and right sides of the backrest frame 50, so that users can adjust it to different heights or depths.

[0083] In particular, the mesh pressure plates 120 provided on each of the pair of moving bodies 110 are preferably positioned on the inside between the left and right ends of the pair of backrest frames 50, but even further outward than the intermediate portion between the left and right ends, in order to minimize direct support of the user's back.

[0084] This is because, in the case of the lumbar support assembly 100 according to one embodiment of the present invention, when supporting the user's back area (particularly the lumbar area), instead of minimizing the direct support of the user's back area by the mesh pressure plate 120, the user's back area is indirectly supported by increasing or decreasing the tension of the back support mesh 55.

[0085] The operation of the lumbar support assembly 100 according to one embodiment of the present invention, as described above, can be briefly explained with reference to the attached drawings (in particular, Figures 9 and 10) as follows.

[0086] First, the lumbar support assembly 100 according to one embodiment of the present invention is provided in pairs (100A, 100B) one at the left end and one at the right end of the backrest frame 50. As shown in Figure 4, the user can adjust the height by moving the moving body 110 vertically along the backrest frame 50 using the handle portion 111 of the moving body 110, and can also adjust the front-to-back depth by moving the mesh pressure plate 120 using the lever handle 132 of the front-to-back moving adjustment lever 130.

[0087] In this state, as shown in Figure 9, when the lever handle 132 of the front-to-back moving adjustment lever 130 is positioned facing upwards in the drawing, the rotating cam surface 133 and the corresponding cam surface 123 remain aligned. As shown in Figure 10, when the lever handle 132 of the front-to-back moving adjustment lever 130 is rotated toward the ground or in the opposite direction, the alignment between the rotating cam surface 133 and the corresponding cam surface 123 is released, allowing the mesh pressure plate 120 to move forward while being stopped at any one of the multiple rotation angle points 123a, 123b, and 123c.

[0088] When the mesh pressure plates 120 are moved forward from the left and right ends of the backrest frame 50, the tension increases as the middle portion of the backrest support mesh 55 is moved forward as a whole. This allows the user to comfortably support their back only against the backrest support mesh 55 that has been moved forward, thus providing the advantage of increased ease of use and comfort.

[0089] Specific embodiments of the present invention do not exclude a chair 1 equipped with the lumbar support assembly 100 described above.

[0090] In other words, as shown in Figures 1 to 4, a chair 1 according to one embodiment of the present invention comprises a backrest frame 50, a backrest support mesh 55 provided on the backrest frame 50 to support the user's back, and a lumbar support assembly 100 provided so as to be movable vertically along the backrest frame 50, which presses forward both the left and right ends of the backrest support mesh 55, but is adjustable so as to have different tensions in the backrest support mesh 55.

[0091] Since the specific configuration of the lumbar support assembly 100 is as described above, a detailed explanation of the chair 1 according to one embodiment of the present invention will be omitted to the extent that it is redundant.

[0092] A lumbar support assembly and a chair equipped therewith according to one embodiment of the present invention have been described in detail above with reference to the attached drawings. However, it should be noted that embodiments of the present invention are not necessarily limited to the embodiment described above, and that various modifications and equivalences of the invention are possible by persons with ordinary skill in the art to which the present invention pertains. Therefore, the true scope of the present invention will be determined by the claims described later. [Industrial applicability]

[0093] The present invention provides a lumbar support assembly and a chair equipped therewith, which are designed to provide indirect lumbar support by adjusting the tension of a backrest support mesh without directly supporting the user's back, and which are provided in pairs on the left and right sides of the backrest frame, allowing the tension of the backrest support mesh to be adjusted to different heights and depths. [Explanation of symbols]

[0094] 1: Chair 10: Body part 20: Seat section 30: Leg section 40: Armrest section 50: Backrest frame 50A: Outer backrest frame 50B: Inner backrest frame 50C: Lumber rail guide frame 50B-h: Rail guide mounting groove 55: Backrest support mesh 100: Lumbar support assembly 110: Moving body 111: Handle 112: Sliding block 113: Through section 114: Fastening boss 115: Haptic block 116: Cover panel 117: Decorative panel 120: Mesh pressure plate 123: Compatible cam surface 130: Front / rear moving adjustment lever 132: Lever handle 133: Rotating cam surface 140: Retaining clamping member

Claims

1. A pair of moving bodies are provided to move vertically along the left and right sides of the backrest frame, A mesh pressure plate is provided so as to be movable in the front-rear direction relative to each of the pair of moving bodies, and presses forward the left and right ends of the backrest support mesh provided on the backrest frame to support the user's back, Equipped with, A lumbar support assembly characterized in that a pair of mesh pressure plates, each provided on the pair of moving bodies, can apply pressure to the backrest support mesh at different heights and with different pressures through user operation.

2. The lumbar support assembly according to claim 1, wherein each of the pair of moving bodies has a handle portion formed thereon that extends for a predetermined length from the left end to the right end or from the right end to the left end of the backrest frame for the user to grasp by hand.

3. Each of the pair of moving bodies is provided with a front-to-back moving adjustment lever for moving the mesh pressure plate in the front-to-back direction. The lumbar support assembly according to claim 1, wherein the forward and backward moving adjustment lever is provided to stop after the mesh pressure plate has been moved such that the pressure applied to the backrest support mesh differs at a plurality of different rotation angle points.

4. The aforementioned front and rear moving adjustment lever is provided in a hollow form so that a guide pole, which is formed to protrude rearward from the back of the mesh pressure plate, passes through it. The lumbar support assembly according to claim 3, wherein a rotating cam surface is formed on the inner circumferential surface of the hollow portion of the front and rear moving adjustment lever, which is continuously formed in the circumferential direction to form the plurality of different rotation angle points, but which has different separation distances from the rear end.

5. The lumbar support assembly according to claim 4, wherein a corresponding cam surface is formed around the guide pole of the mesh pressure plate so as to be aligned with or separated from the rotating cam surface of the front and rear moving adjustment lever, but having a different separation distance from the back surface of the mesh pressure plate.

6. The lumbar support assembly according to claim 5, wherein the rotating cam surface and the corresponding cam surface have a plurality of locking portions formed thereon, which lock the rotation of the front and rear moving adjustment lever at the different rotation angle points.

7. The lumbar support assembly according to claim 4, wherein the guide pole formed on the mesh pressure plate is inserted from the front to the rear of the front-to-rear moving adjustment lever, but is engaged with the inside of the moving body by a guide screw fastened from the rear to the front of the front-to-rear moving adjustment lever so as to prevent it from coming off forward.

8. The lumbar support assembly according to claim 3, wherein the front-to-back moving adjustment lever has a lever handle that protrudes radially outward for the user to rotate with their fingers.

9. The lumbar support assembly according to claim 8, wherein the front-to-back moving adjustment lever is rotated such that the tip of the lever handle is directed inward between the left and right ends of the backrest frame.

10. The moving body is further provided with a sliding block, part of which is inserted inside the backrest frame and slides vertically. The lumbar support assembly according to claim 1, wherein the sliding block is provided with a haptic block that applies a predetermined elastic force to the inner surface of the backrest frame.

11. The lumbar support assembly according to claim 1, wherein the mesh pressure plates provided on each of the pair of moving bodies are located on the inside between the left end and the right end of the pair of backrest frames, but are positioned further outward than the intermediate portion between the left end and the right end.

12. Backrest frame and The aforementioned backrest frame is provided with a backrest support mesh to support the user's back, A lumbar support assembly is provided that is movable vertically along the backrest frame and applies forward pressure to both the left and right ends of the backrest support mesh, but is adjustable so that the tension of the backrest support mesh is different. Equipped with, The lumbar support assembly is A pair of moving bodies are provided along the left and right sides of the aforementioned backrest frame, respectively, so as to be movable in the vertical direction, A mesh pressure plate is provided so as to be movable in the front-rear direction relative to each of the pair of moving bodies, and presses forward the left and right ends of the backrest support mesh provided on the backrest frame to support the user's back, Equipped with, A chair characterized in that a pair of mesh pressure plates can apply pressure to the backrest support mesh at different heights and with different pressures, depending on the user's operation.

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