A new back frame structure based on waist support

Abstract

The present invention discloses a novel backrest structure based on lumbar support, comprising a back support body, which is an integrated frame structure; the back support body comprises side support bodies on both sides, each side support body is provided with a longitudinal hollow part; the side support bodies correspondingly form a front side frame located in front of the hollow part and a rear side frame located behind the hollow part; the lumbar support is arranged on the back support body; the two ends of the lumbar support are respectively inserted into the hollow part; and the end of the lumbar support is abutted against and slidably connected to the rear side frame; the lumbar support can be slid up and down along the rear side frame for adjustment; the front side frame and the rear side frame are both arc-shaped structures protruding forward at the lumbar support position; the front side frame protrudes forward at the lumbar support position to form a first arc convex part; the rear side frame protrudes forward at the lumbar support position to form a second arc convex part; and the curvature of the first arc convex part is greater than that of the second arc convex part; the front side frame is used to meet the shape requirements of ergonomics, and the rear side frame only needs to cooperate with the lifting and lowering adjustment of the lumbar support; the structural design is very ingenious.

Description

Technical Field

[0001] The invention relates to the field of seats, and in particular to a novel back frame structure based on a waist support. Background Art

[0002] In order to meet the requirements of comfort, existing office chairs are equipped with lumbar support; the back frame structure of the seat is usually divided into a single-frame mesh chair and a double-frame mesh chair.

[0003] For single-frame mesh chairs, there are several ways to install the lumbar support:

[0004] 1. Install the two ends of the lumbar support on the back rods on both sides of the back frame, and the lumbar support can be slid up and down to adjust; as disclosed in CN201921278307.2, a "chair with adjustable lumbar support height" includes a support seat, a chair back and a seat. The chair back has a frame, a covering body and a lumbar support. The frame has a hollow portion. The lumbar support is located in the hollow portion and is slidably connected to two opposite inner sides of the frame to change the height of the lumbar support on the frame. The covering body covers the hollow portion and the lumbar support of the frame. The seat connects the support seat and the chair back. In this way, through the above-mentioned structure, the user can adjust the height position of the lumbar support by himself so that it can accurately rest against the user's expected waist position.

[0005] However, this type of lumbar support connection structure has the following disadvantages: 1. It is inconvenient to operate. When adjusting, the arm needs to be bent at a large angle and stretched behind the back frame to grab the lumbar support and move it up and down, which is quite laborious. 2. In order to meet the needs of ergonomics, the back frame shape of the single-frame mesh chair can be divided into two sections, the upper and lower sides of the back frame. The intersection of the upper and lower sections, that is, the front position of the waist, forms a large angle, that is, a sharp angle protruding forward / arc protruding forward, which is to meet the needs of waist support; and the lumbar support is installed here, resulting in interference in the up and down movement, and a small stroke; and because this place is a sharp angle, it is difficult to achieve the up and down movement of the lumbar support in a perfect arc shape to adapt to the mesh and meet the requirements of comfortable waist support, and the waist support effect is not good. In response to the above problem, some seats have two symmetrical support seats at the corners, and the two ends of the lumbar support are installed on the support seats. This can basically meet the needs of the lumbar support movement, but the movement range of the lumbar support is limited; furthermore, when the lumbar support moves, it produces an up and down relative movement with the support seat, and the two will be staggered up and down, resulting in a gap between the lumbar support and the support seat as soon as it slides, which destroys the integrity and continuity of the lumbar support in appearance, and the lumbar support looks abrupt.

[0006] Furthermore, if the lumbar support is simply adjusted to have a wide range of vertical movement, the side bars of the back frame can be simply designed to be as straight as possible; but in this case, the appearance and ergonomic design of the back frame are greatly limited, and the user cannot be comfortably supported. Therefore, in general, the above-mentioned lumbar support connection structure cannot take into account both ergonomics and appearance; if the requirement of a large lumbar support adjustment range is met, the appearance design and ergonomics of the back frame are greatly limited; conversely, if the latter is met, the former is limited. In addition, the two ends of the lumbar support are installed on the two side bars of the back frame. Because the installation space is limited, the thickness of the lumbar support needs to be thin. If the thickness is too thick, it will be too forward and the waist will be uncomfortable.

[0007] Second, a longitudinal beam is arranged in the middle of the back frame, and the longitudinal beam extends from the lower end to the upper end of the back frame. The lumbar support is arranged on the longitudinal beam and slides up and down along the longitudinal beam; for example, CN201921150190.X discloses an "office chair with adjustable lumbar support". It includes a seat and a backrest, and the backrest includes a fixed plate with an opening in the middle and a lumbar support. The two sides of the fixed plate are respectively provided with an elastic pad and a support member perpendicular to the seat. The support member is provided with a vertical guide portion, and one end of the lumbar support is slidably arranged on the guide portion through a connecting member, and the other end passes through the opening and abuts against the elastic pad; the guide portion is a strip through hole, and the end of the connecting member passes through the strip through hole and forms an adjustment portion; the physical part of the support member is provided with a slide groove parallel to the guide portion, and a slider is provided in the slide groove; the adjustment portion is provided with a connecting block parallel to the slider, and the connecting block is connected to the slider through an elastic member. This type of lumbar support structure sets the lumbar support on the longitudinal beam, so that the adjustment range of the lumbar support is sufficient. However, the disadvantages are: 1. It is also inconvenient to operate; 2. The longitudinal beam feels abrupt, the appearance is relatively traditional, not fashionable and simple enough; it interferes with the structural shape of the back frame itself.

[0008] Third, a fixed bracket is arranged at the middle position of the lower end of the back frame, and the waist support is arranged on the bracket and can move up and down. This structure is similar to the second structure; it also has the defects of unfashionable appearance and strong abruptness.

[0009] In addition, for the second and third structures, the lumbar support moves vertically up and down no matter it is set on the longitudinal beam or the bracket, and it is also difficult to achieve a perfect arc movement, and it is difficult to provide a perfect arc sliding for the lumbar support, and the lumbar support and the mesh are not closely fitted; and if the bracket is forcibly made into a perfect arc shape, the appearance is unsightly and gives people a strange feeling.

[0010] For a double-frame mesh chair, the double-frame mesh chair is assembled by combining two back frames in front and back. The double-frame mesh chair can set the lumbar support on the rear frame; the shape of the front frame can be designed to meet ergonomics, and the waist can be pushed forward; and the rear frame can be slightly designed to be slightly straight or in a perfect arc shape, so that the lumbar support can slide along the rear frame up and down in a perfect arc, and can comfortably support the waist. As disclosed in CN201920187197.2, "a backrest and a seat", a back support member, a support frame for supporting the back support member, at least 3 elastic members are connected between the upper part of the back support member and the upper part of the support frame, and the elastic members will bend and deform when subjected to pressure. The backrest adopts a front and rear double back structure, and the lumbar support can be set on the rear back frame.

[0011] However, the processing and manufacturing cost of the double-frame mesh chair is relatively high. Two molds need to be opened, which increases the assembly process. In addition, many manufacturers make a fuss about the assembly structure, which further increases the difficulty and cost. In addition, on the basis of the double back, when the front frame of the double-frame mesh chair is assembled with mesh cloth, due to the tension of the mesh cloth and the deformation of the plastic itself, the front frame will deform, and this deformation is difficult to control; therefore, when further assembled with the back frame, it is not easy to align the connection holes, and it is difficult to assemble in place, which makes assembly difficult. Even if the assembly is completed, there are gaps in the double-frame assembly structure (joint), which are easily exposed, resulting in poor integrity and affecting the appearance. Summary of the invention

[0012] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and to provide a new back frame structure based on a lumbar support, by arranging a hollow portion on the side support body to form a front side frame and a rear side frame; the lumbar support is slidably connected to the rear side frame; then the front side frame does not need to consider the installation of the lumbar support, and the curvature of the front side frame can be designed to be larger, which can better meet the ergonomic shape requirements; and the lumbar support is slidably connected to the rear side frame, and the rear side frame only needs to cooperate with the lumbar support to ensure that the lumbar support has sufficient lifting stroke; the front side frame and the rear side frame each perform their respective functions, and the structural design is very clever; in addition, although the back support body looks like a double-back structure, it is actually an integrated structure, which is easy to process.

[0013] The technical solution of the present invention is achieved in this way:

[0014] A new type of backrest structure based on lumbar support, comprising: a back support body, which is an integrated frame structure; the back support body comprises side support bodies respectively located on the left and right sides, each side support body is provided with a longitudinal hollow part, and the hollow part runs through the side support body from left to right; the side support bodies correspondingly form a front side frame located in front of the hollow part and a rear side frame located behind the hollow part; the lumbar support is arranged on the back support body; the two ends of the lumbar support are respectively inserted in the hollow part; and the end of the lumbar support is abutted against and slidably connected to the rear side frame; the lumbar support can be slid up and down along the rear side frame for adjustment; the front side frame and the rear side frame are both arc-shaped structures protruding forward at the lumbar support position; the front side frame protrudes forward at the lumbar support position to form a first arc convex part; the rear side frame protrudes forward at the lumbar support position to form a second arc convex part; and the curvature of the first arc convex part is greater than that of the second arc convex part.

[0015] Preferably, the front side frame and the rear side frame are staggered in distribution, the front side frame is located in front of the rear side frame and the front side frame is offset relative to the rear side frame toward the outside of the back support body; along the front-to-back direction, the front side frame and the back side frame partially overlap front and back. Then, the front side frame and the rear side frame are not completely overlapped front and back, but staggered left and right, so that the front side frame and the rear side frame only partially overlap front and back; such a design is because the hollow part is formed by stripping the side support body on the mold, thereby reducing the width of the stripped part, making it easier for the side support body to strip to form the hollow part.

[0016] Preferably, the width of the front and rear overlapping parts of the front side frame and the rear side frame is between 0.5-5 cm. The overlapping parts of the two are minimized as much as possible, so that the processing and molding of the hollow part is more convenient.

[0017] Preferably, the two ends of the waist support have hand-held parts for users to hold; along the left and right directions, the hand-held parts protrude outward from the rear side frame but not beyond the front side frame, so that the user can control the lifting and lowering by extending his hand on the side of the back support body; and the hand-held parts are only exposed at the rear end of the back support body, and not at the front end of the back support body.

[0018] Preferably, the longitudinal length of the hollow portion is at least 3 / 5 of the longitudinal length of the side support body. By providing the hollow portion, the back support body looks like an obvious double-back structure, which is simple and beautiful.

[0019] Preferably, the back support body is provided with a back mesh, and the outer periphery of the front end of the front side frame is provided with an embedding groove for connecting the back mesh. Then the mesh structure of the back support body is the same as the mesh structure of the single-frame mesh chair, making the mesh operation convenient.

[0020] Preferably, the side of the waist support is fitted to the front end of the second arc convex part, and the waist support can be adjusted up and down in a perfect arc shape along the second arc convex part, so that the waist support is not adjusted straight up and down, but can fit the backrest mesh and meet the requirements of comfortable waist support.

[0021] Preferably, a sliding mechanism is provided between the waist support and the second arc convex part, and the sliding mechanism includes a guide convex strip arranged on the side of the waist support and protruding backwards, and a sliding matching part correspondingly arranged at the front end of the second arc convex part; the sliding matching part is provided with a longitudinal guide groove that can slide with the guide convex strip; the side shape of the second arc convex part and the side cross-sectional shape of the guide groove are both in the shape of a perfect circular arc; the rear end of the guide convex strip is configured to have an arc that matches the guide groove; the rear end of the guide convex strip is in front and back contact with the inner wall of the guide groove, and the guide convex strip can slide up and down along the guide groove. Therefore, when the guide convex strip slides up and down along the guide groove, the waist support can be adjusted up and down in a perfect circular arc.

[0022] Preferably, a lifting and lowering adjustment mechanism is provided between the lumbar support and the rear side frame, and the lifting and lowering adjustment mechanism includes an elastic clamping ring arranged on the sliding fitting part, and a longitudinal gear slot correspondingly arranged at the side end of the lumbar support; the gear slot runs through the lumbar support front and back; longitudinally spaced positioning slots are respectively provided on both sides of the gear slot; while the guide convex strip slides in the guide slot, the elastic clamping ring is located in the gear slot and the two ends of the elastic clamping ring can be respectively engaged with the positioning slots. Then, when the guide convex strip slides in the guide slot, the elastic clamping ring just fits in the gear slot; thus, the elastic deformation of the elastic clamping ring is used to engage with the positioning slots at different positions, which can play a role in damping lifting and lowering adjustment, making the operation convenient, and no additional locking structure is required; and multiple positioning slots are provided, so that the lumbar support has multiple adjustment positions and a good gear sense.

[0023] Preferably, a limit seat is provided at the gear slot at the front end of the lumbar support, the width of which is wider than that of the gear slot; the limit seat is connected to the rear side frame to limit the lumbar support from detaching from the rear side frame; the lumbar support is clamped between the limit seat and the rear side frame.

[0024] Preferably, the sliding fitting part is provided with a limit column for connecting the elastic collar and connecting columns respectively located at the upper and lower ends of the limit column; the limit seat is provided with a connecting hole, and the limit seat and the connecting column are fixedly connected by screws. After the connection, the elastic collar will be hidden between the limit seat and the rear side frame, which can hide the connection traces and has a beautiful appearance.

[0025] Preferably, the side shape of the entire side support body is arched, and the hollow portion is formed in the side support body and has an arched side shape as well, so that the front side frame and the rear side frame can just form an arc-shaped structure protruding forward at the waist support position.

[0026] Preferably, the front and rear spacing of the hollow part gradually decreases from the lumbar support position to the upper and lower ends, respectively, so that the lumbar support has sufficient installation space in the hollow part, the thickness of the lumbar support can be increased, and the comfort of the lumbar support is improved; and the upper and lower ends of the hollow part have a small spacing, so as to ensure the structural strength of the side support body.

[0027] The design starting point, concept and beneficial effects of the present invention using the above technical solution are:

[0028] First, the present invention forms the front side frame and the rear side frame by setting a hollow part on the side support body; the lumbar support is slidably connected to the rear side frame; then the front side frame does not need to consider the installation of the lumbar support, and the curvature of the first arc convex part can be designed to be larger, which can better meet the ergonomic shape requirements. The lumbar support is slidably connected to the rear side frame, and the rear side frame does not need to consider the ergonomic shape; so that the second arc convex part only needs to cooperate with the lumbar support to meet the lumbar support. The lumbar support has enough lifting stroke, and the curvature of the second arc convex part is smaller than the first arc convex part. Then the front side frame and the rear side frame perform their respective functions, and the structural design is very clever. In addition, although the back support body looks like a double-back structure, it is actually an integrated structure; the front side frame and the rear side frame are formed only by setting a hollow part; there is no need to open two molds, which makes processing and manufacturing more convenient, saving mold costs and reducing assembly processes.

[0029] Secondly, the side shape of the second arc convex portion and the side cross-sectional shape of the guide groove are both perfect circular arcs; the rear end of the guide ridge is configured to have an arc that matches the guide groove; the rear end of the guide ridge is fitted with the inner wall of the guide groove front and back and the guide ridge can slide up and down along the guide groove; thus, when the guide ridge slides up and down along the guide groove, the lumbar support can be adjusted up and down in a perfect circular arc, so that the lumbar support is not adjusted straight up and down during the up and down adjustment process, but can fit the backrest mesh and meet the requirements of comfortable lumbar support.

[0030] Furthermore, the front side frame and the rear side frame are staggered left and right, so that the front side frame and the rear side frame are not completely overlapped front to back, but are staggered left to right, so that the front side frame and the rear side frame only partially overlap front to back; this design is due to the fact that the hollow portion is formed by stripping the side support body on the mold, thereby reducing the width of the stripped portion, making it easier for the side support body to strip to form the hollow portion.

[0031] In addition, the side of the hollow part is in an arch shape, and the front and rear spacing of the hollow part gradually decreases from the waist support position to the upper and lower ends, respectively. This allows the waist support to have sufficient installation space in the hollow part, and the thickness of the waist support can be increased to improve the comfort of the waist support; and the upper and lower ends of the hollow part have a small spacing, so as to ensure the structural strength of the side support body. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1It is a schematic diagram of the side three-dimensional structure after the back support body and the waist support are assembled in the embodiment of the present invention;

[0033] Figure 2 A rear view of the back support body and the lumbar support after being assembled in the embodiment of the present invention;

[0034] Figure 3 A side view of the back support body and the lumbar support after being assembled in an embodiment of the present invention;

[0035] Figure 4 It is a schematic diagram of the three-dimensional structure of the back support body in an embodiment of the present invention;

[0036] Figure 5 It is a cross-sectional view of a section between a front side frame and a rear side frame in an embodiment of the present invention;

[0037] Figure 6 Schematic diagram of the three-dimensional structure of the first arc convex portion and the second arc convex portion in an embodiment of the present invention;

[0038] Figure 7 It is a front three-dimensional structural schematic diagram of the cooperation between the back support body and the waist support in an embodiment of the present invention;

[0039] Figure 8 It is a schematic diagram of the structure of the waist support connected to the rear side frame in an embodiment of the present invention;

[0040] Fig. 9 It is a schematic diagram of the three-dimensional structure of the sliding fitting part in the embodiment of the present invention;

[0041] Fig.10 A side cross-sectional view of the waist support and the rear side frame in the embodiment of the present invention;

[0042] Fig.11 A side cross-sectional view of the waist support and the rear side frame in the embodiment of the present invention;

[0043] Fig.12 It is a schematic diagram of the three-dimensional structure of the elastic clamp ring in the embodiment of the present invention fitted in the gear sliding groove;

[0044] Fig.13 It is a schematic diagram of the three-dimensional structure of the connection between the elastic clamp ring and the sliding fitting part in an embodiment of the present invention.

[0045] The figures are marked as follows: back support body 1; side support body 2; hollow portion 3; front side frame 4; first arc convex portion 4a; rear side frame 5; second arc convex portion 5a; lumbar support 6; embedded groove 7; guide ridge 8; sliding fitting portion 9; guide groove 10; elastic clamping ring 11; gear slide groove 12; limit column 13; positioning slot 14; limit seat 15; connecting column 16; connecting hole 17; hand-held portion 18. DETAILED DESCRIPTION

[0046] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0047] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0048] In the description of the present invention, the term "at least one" refers to one or more than one, unless otherwise clearly defined. The terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0049] The specific implementation of the present invention is as follows:

[0050] like Figure 1-13 As shown, the present invention provides a new back frame structure based on lumbar support, which includes a back support body 1 and a lumbar support 6 arranged on the back support body 1; wherein the back support body 1 is an integrated frame structure; the back support body 1 includes side supports 2 located longitudinally on the left and right sides respectively. Each side support body 2 is provided with a longitudinal hollow portion 3, and the hollow portion 3 runs through the side support body 2 from left to right; so that the side support body 2 forms a front side frame 4 located in front of the hollow portion 3 and a rear side frame 5 located in the rear of the hollow portion 3; the two ends of the lumbar support 6 are respectively inserted in the hollow portion 3, and the end of the lumbar support 6 is abutted and slidably connected to the rear side frame 5; then the lumbar support 6 can be slid up and down along the rear side frame 5 for adjustment. The front side frame 4 and the rear side frame 5 are both arc-shaped structures that protrude forward at the position of the lumbar support 6; the front side frame 4 protrudes forward at the position of the lumbar support 6 to form a first arc convex portion 4a; the rear side frame 5 protrudes forward at the position of the lumbar support 6 to form a second arc convex portion 5a; and the curvature of the first arc convex portion 4a is greater than that of the second arc convex portion 5a.

[0051] Specifically, for the backrest with a single frame structure in the prior art, in order to match the shape requirements of ergonomics, the back frame is often designed to be convex at the waist position to form a larger convex corner (i.e., the first arc convex part 4a is obviously convex), which is to meet the needs of supporting the waist and match the human spine curve; and to make the shape beautiful. For the backrest with a single frame structure, the lumbar support can only be installed at the convex corner (the first arc convex part 4a), but because the bending degree is too large, the up and down movement of the lumbar support is interfered, and the stroke is small; and because the shape here is a sharp angle, it is difficult for the lumbar support to achieve the up and down movement of the right arc, and it cannot adapt to the mesh and meet the requirements of comfortable supporting the waist. In view of the above problems, the present invention forms a front side frame 4 and a rear side frame 5 by arranging a hollow part 3 on the side support body 2; the lumbar support 6 is slidably connected to the rear side frame 5; then the front side frame 4 does not need to consider the installation of the lumbar support 6, and the bending degree of the first arc convex part 4a can be designed to be larger, which can better meet the shape requirements of ergonomics. The lumbar support 6 is slidably connected to the rear side frame 5, and the rear side frame 5 does not need to consider the ergonomic shape; so that the second arc convex portion 5a only needs to cooperate with the lumbar support 6 to ensure that the lumbar support 6 has sufficient lifting stroke. Then the front side frame 4 and the rear side frame 5 each perform their own functions, and the structural design is very clever. In addition, although the back support body 1 looks like a double-back structure, it is actually an integrated structure; the front side frame 3 and the rear side frame 5 are formed by setting the hollow part 3; there is no need to open two molds, which makes processing and manufacturing more convenient, saves mold costs, and reduces assembly processes.

[0052] like Figure 1-6 As shown, the front side frame 4 and the rear side frame 5 are staggered left and right, that is, the front side frame 4 is located in front of the rear side frame 5 and is offset relative to the rear side frame 5 toward the outside of the back support body 1; therefore, Figure 5 As shown, along the front-to-back direction, the front side frame 4 and the rear side frame 5 only partially overlap front to back. The reason for this design is that the hollow portion 3 is formed by stripping the side support body 2 on the mold, and then the width (i.e., thickness) of the stripped portion should not be too high, otherwise it will affect the processing; if the front side frame 4 and the rear side frame 5 completely overlap front to back, the width of the stripped portion is undoubtedly too large, which will cause processing difficulties. Therefore, the front side frame 4 and the rear side frame 5 of the present invention are not completely overlapped front to back, and the two only partially overlap front to back; the width of the stripped portion can be reduced, making it more convenient to strip the side support body 2 to form the hollow portion 3; the design is ingenious. More specifically: the width of the front-to-back overlapping portion of the front side frame 4 and the rear side frame 5 is between 0.5-5cm, and the overlapping portion of the two is minimized as much as possible, so that the processing and forming of the hollow portion 3 is more convenient.

[0053] like Figure 7As shown, a back mesh (not shown) is connected to the back support body 1, wherein an embedding groove 7 for connecting the back mesh is provided on the outer periphery of the front end of the front side frame 4, and both sides of the back mesh are connected to the embedding groove 7; then the mesh structure of the back support body 1 is the same as the mesh structure of the single-frame mesh chair, so that the mesh operation is very convenient.

[0054] like Figure 1-6 As shown, the overall side shape of the side support body 2 is arched, and the hollow portion 3 is formed in the side support body 2 and its side shape is also arched; so that the front side frame 4 and the rear side frame 5 can just form an arc-shaped structure protruding forward at the position of the waist support 6, making the overall structure beautiful; the structural design is ingenious. Further: the waist support 6 is connected to the rear side frame 5, and then the front side frame 4 will not be limited by the waist support 6; so the first arc convex part 4a can be designed to be more prominent, so that the shape of the front side frame 4 is consistent with ergonomics and meets the design requirements of aesthetic appearance. The two ends of the waist support 6 are attached and slidably connected to the rear side frame 5, and the waist support 6 can slide up and down along the rear side frame 5; therefore, in order to ensure the adjustment stroke of the waist support 6 moving up and down, the curvature of the second arc convex part 5a is designed to be relatively smooth, which must be smaller than the curvature of the first arc convex part 4a. The side of the waist support 6 is fitted to the front end of the second arc convex part 5a, and the waist support 6 can be adjusted up and down in a perfect circular arc along the second arc convex part 5a; specifically, the side shape of the second arc convex part 5a is a perfect circular arc, so that when the waist support 6 slides up and down along the rear side frame 5, the waist support 6 can be adjusted up and down in a perfect circular arc, so that the waist support 6 is not adjusted straight up and down during the up and down adjustment process, but can fit the backrest mesh and meet the requirements of comfortable waist support. Then the structural design of the side support body 2 of the present invention can make the shape of the front side frame 4 of the back support body 1 conform to the shape of ergonomics and not be restricted by the waist support 6; and the waist support 6 is set on the rear side frame 5, which can meet the requirements of the waist support 6. The vertical length of the hollow part 3 is at least 3 / 5 of the vertical length of the side support body 2; so that by setting the hollow part 3, the back support body 1 looks like an obvious double back structure, and the structure is beautiful. Moreover, the front-to-rear spacing of the hollow portion 3 gradually decreases from the position of the lumbar support 6 toward the upper and lower ends respectively; so that the lumbar support 6 has sufficient installation space in the hollow portion 3, and the thickness of the lumbar support 6 can be increased to enhance the comfort of the lumbar support 6; and the upper and lower ends of the hollow portion 3 have a small spacing, thereby ensuring the structural strength of the side support body 2.

[0055] like Figure 8-11 As shown, waistThe sliding connection structure between the waist support 6 and the rear side frame 5 is specifically as follows: a sliding mechanism is provided between the waist support 6 and the second arc convex portion 5a, and the sliding mechanism includes a guide convex strip 8 provided on the side of the waist support 6 and protruding backwards, and a sliding matching portion 9 correspondingly provided at the front end of the second arc convex portion 5a, and a longitudinal guide groove 10 capable of slidingly matching with the guide convex strip 8 is provided on the sliding matching portion 9; Fig.10 , 11 As shown, the guide ridge 8 is slidably fitted in the guide groove 10; and the rear end of the guide ridge 8 is tightly attached to the inner wall of the guide groove 10 front and back; specifically: the side cross-section of the guide groove 10 is in the shape of a perfect circular arc, and the rear end of the guide ridge 8 is configured to have an arc that matches the guide groove 10, so that the guide ridge 8 can fit on the inner wall of the guide groove 10; thereby, when the guide ridge 8 slides up and down along the guide groove 10, the lumbar support 6 can be adjusted up and down in a perfect circular arc along the second sliding protrusion 5a.

[0056] In addition, if Figure 11-13 As shown, a lifting and lowering adjustment mechanism is also provided between the waist support 6 and the rear side frame 5, and the lifting and lowering adjustment mechanism includes an elastic collar 11 provided on the sliding fitting portion 9 of the rear side frame 5, and a longitudinal gear slide groove 12 correspondingly provided at the side end of the waist support 6; specifically, a forwardly protruding limit column 13 is provided at the corresponding position of the sliding fitting portion 9 and the guide groove 10, and the elastic collar 11 is a rubber ring, and the elastic collar 11 is connected to the limit column 13; the gear slide groove 12 is longitudinally provided at the corresponding position of the side of the waist support 6, and the gear slide groove 12 penetrates the waist support 6 front and back; longitudinally spaced positioning grooves 14 are respectively provided on both sides of the gear slide groove 12. After the guide convex strip 8 is slidably fitted in the guide groove 10, the elastic collar 11 is located in the gear slide groove 12, and the two ends of the elastic collar 11 can be respectively engaged with the positioning grooves 14. Then, when the lumbar support 6 is raised or lowered along the rear side frame 5, the elastic clamp ring 11 will be elastically deformed and engage with the positioning slots 14 at different positions, so as to play a role in damping the lifting and lowering adjustment, making the operation convenient without the need to set up an additional locking structure; and a plurality of positioning slots 14 are provided, so that the lumbar support 6 has multiple adjustment positions and a good gear sense.

[0057] Furthermore, a limit seat 15 is provided at the gear slide groove 12 at the front end of the waist support 6, and the width of the limit seat 15 is wider than the width of the gear slide groove 12; the limit seat 15 is connected to the rear side frame 5 to limit the waist support 6 from being separated from the rear side frame 5, specifically: connecting columns 16 are provided at the upper and lower ends of the elastic clamp ring 11 of the sliding fitting part 9, and connecting holes 17 are correspondingly provided on the limit seat 15; the limit seat 15 is connected to the rear side frame 5 by screws, and the screws pass through the connecting holes 17 from front to back and are connected in the connecting columns 16; then, when the limit seat 15 is assembled, the waist support 6 is tightly connected to the rear side frame 5; and after the connection, the elastic clamp ring 11 will be hidden between the limit seat 15 and the rear side frame 5, which can hide the connection traces and beautify the appearance. Then, when it is necessary to adjust the waist support 6 to rise and fall, it is only necessary to directly apply force to the waist support 6; the operation is very convenient and quick.

[0058] like Figure 2 , 3 As shown in Figures 8 and 9, at both ends of the waist support 6, there are hand-held portions 18 for users to hold; along the left and right directions, the hand-held portions 18 protrude outward from the rear side frame 5 but do not exceed the front side frame 4. When the user sits on the chair, the user can control the waist support to adjust the lifting and lowering by extending both hands on the side of the back support body 1, which is convenient for adjustment; and the hand-held portions 18 are only exposed at the rear end of the back support body 1, but not at the front end of the back support body 1, making the structure beautiful.

Claims

1. A new backrest structure based on lumbar support, characterized in that: include: The back support body is an integrated frame structure; The back support body comprises side support bodies respectively located on the left and right sides, each side support body is provided with a longitudinal hollow part, and the hollow part runs through the side support body from left to right; the longitudinal length of the hollow part is at least 3 / 5 of the longitudinal length of the side support body; and the front and rear spacing of the hollow part gradually decreases from the waist support position to the upper and lower ends respectively; the side support body forms a front side frame located in front of the hollow part and a rear side frame located behind the hollow part; the front side frame and the rear side frame are staggered in distribution from left to right, the front side frame is located in front of the rear side frame and the front side frame deviates relative to the rear side frame toward the outer side of the back support body; along the front and rear direction, the front side frame and the back side frame partially overlap front and back, and the width of the front and rear overlapping part of the front and rear side frame is between 0.5-5cm; the front side frame and the rear side frame are both arc-shaped structures protruding forward at the waist support position; the front side frame protrudes forward at the waist support position to form a first arc convex part; The rear side frame is convex forward at the waist support position to form a second arc convex part; The curvature of the first arc convex portion is greater than the curvature of the second arc convex portion; The lumbar support is arranged on the back support body; the two ends of the lumbar support are respectively inserted into the hollow part; and the end of the lumbar support is close to and slidably connected to the rear side frame, so that the lumbar support can be raised and lowered in a perfect circular arc along the second arc protrusion.

2. The novel backrest structure based on lumbar support according to claim 1 is characterized in that: The width of the front-to-back overlapping portion of the front side frame and the rear side frame is between 0.8-2 cm.

3. The novel backrest structure based on lumbar support according to claim 1 is characterized in that: Both ends of the waist support are provided with a hand-held portion for the user to hold; along the left-right direction, the hand-held portion protrudes outward from the rear side frame but does not exceed the front side frame.

4. The novel backrest structure based on lumbar support according to claim 1 is characterized in that: The back support body is provided with a backrest mesh cloth, and the outer peripheral edge of the front end of the front side frame is provided with an embedding groove for connecting the backrest mesh cloth.

5. The novel backrest structure based on lumbar support according to claim 1 is characterized in that: The side of the lumbar support is fitted with the front end of the second arc convex part, and a sliding mechanism is provided between the lumbar support and the second arc convex part, and the sliding mechanism includes a guide convex strip arranged on the side of the lumbar support and protruding backwards, and a sliding matching part correspondingly arranged at the front end of the second arc convex part; the sliding matching part is provided with a longitudinal guide groove that can slide with the guide convex strip; the side shape of the second arc convex part and the side cross-sectional shape of the guide groove are both perfect circular arcs; the rear end of the guide convex strip is configured to have an arc that matches the guide groove; the rear end of the guide convex strip is fitted with the inner wall of the guide groove front and back, and the guide convex strip can slide up and down along the guide groove.

6. The novel backrest structure based on lumbar support according to claim 5 is characterized in that: A lifting and adjusting mechanism is provided between the lumbar support and the rear side frame, and the lifting and adjusting mechanism includes an elastic clamping ring arranged on the sliding fitting portion, and a longitudinal gear slide groove correspondingly arranged at the side end of the lumbar support; the gear slide groove runs through the lumbar support front and back; longitudinally spaced positioning grooves are respectively provided on both sides of the gear slide groove; when the guide convex strip is slidably fitted in the guide groove, the elastic clamping ring is located in the gear slide groove and the two ends of the elastic clamping ring can be respectively engaged with the positioning grooves.

7. The novel backrest structure based on lumbar support according to claim 5 is characterized in that: A limit seat is also provided at the gear slide groove at the front end of the lumbar support, and the width of the limit seat is wider than the width of the gear slide groove; the limit seat is connected to the rear side frame to limit the lumbar support from separating from the rear side frame; the lumbar support is clamped between the limit seat and the rear side frame.

8. The novel backrest structure based on lumbar support according to claim 7 is characterized in that: The sliding fitting part is provided with a limit column for connecting the elastic clamp ring and connecting columns respectively located at the upper and lower ends of the limit column; the limit seat is provided with a connecting hole, and the limit seat and the connecting column are fixedly connected by screws.

9. The novel backrest structure based on lumbar support according to claim 1 is characterized in that: The side surface shape of the whole side support body is arched, and the hollow portion is formed in the side support body and has a side surface shape that is also arched.

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