Back support assembly and chair

Abstract

To provide a back support assembly that provides reliable back support even with an extended service life. [Solution] The back support assembly 100 includes a back support 110, an elastic support member 120, an elastic support rod 130 and an elastic support sheet 140, the back support has a connection part 111, the elastic support member is belt-shaped and both ends are connected to the connection part, the middle part of the elastic support member is curved in a direction away from the connection part, there are multiple elastic support rods, the multiple elastic support rods are installed at angles to each other, one end of each elastic support rod is connected to the side away from the connection part at the middle part of the elastic support member, and the other end is curved to the side away from the elastic support member and connected to the back of the elastic support sheet, the front of the elastic support sheet is used for leaning the back of the human body against it.

Description

[Technical field]

[0001] FIELD OF THE DISCLOSURE The embodiments of the present invention relate to the field of lifestyle products, and more particularly to back support assemblies and chairs. [Background technology]

[0002] As chairs are an essential item in daily life and in the office, people have increasingly come to demand that they be comfortable. Many current chairs usually use elastic mesh fabric to support the back of a user, in order to avoid causing discomfort when the user leans back.

[0003] Although the elastic mesh cloth can better conform to the shape of the user's back and deform in response to the pressure it receives, it is limited by the elastic performance of the elastic mesh cloth, and if it is subjected to pressure for a long time, the mesh cloth will sag and will not be able to provide reliable back support to the user. Summary of the Invention [Problem to be solved by the invention]

[0004] SUMMARY OF THE DISCLOSURE In view of the above problems, the present invention provides a back support assembly and chair which can still provide reliable back support and ensure comfort when reclining even after an extended service life. [Means for solving the problem]

[0005] According to one aspect of the present invention, there is provided a back support assembly, which includes a back support, an elastic support member, an elastic support rod and an elastic support sheet, the back support has a connection portion, the elastic support member is belt-shaped and both ends are connected to the connection portion, the middle portion of the elastic support member is curved in a direction away from the connection portion, there are multiple elastic support rods, the multiple elastic support rods are installed at angles to each other, one end of each elastic support rod is connected to the side away from the connection portion at the middle portion of the elastic support member, and the other end is curved to the side away from the elastic support member and connected to the back of the elastic support sheet, and the front of the elastic support sheet is used for leaning the back of the human body.

[0006] In an alternative embodiment, the elastic support sheet includes a skeletal portion and a flexible portion, the flexible portion is arranged around the outer periphery of the skeletal portion, the rigidity of the skeletal portion is greater than the rigidity of the flexible portion, and the end of the elastic support rod away from the elastic support member is connected to the rear surface of the skeletal portion.

[0007] In an alternative embodiment, the skeletal portion and the flexible portion are made of the same material and are of one-piece construction, and the thickness of the skeletal portion is greater than the thickness of the flexible portion, such that the stiffness of the skeletal portion is greater than the stiffness of the flexible portion.

[0008] In an alternative embodiment, the flexible section is provided with vent holes.

[0009] In an optional form, the back support further has a mesh cloth mounting frame arranged around the outer periphery of the elastic support sheet, the mesh cloth mounting frame is used to connect to the edge of the mesh cloth, and the front surface of the elastic support sheet abuts against the mesh cloth and is used together with the mesh cloth to lean the back of the human body against it.

[0010] In an alternative embodiment, the elastic support sheet is four-petaled, mirror imaged with respect to a vertical line of symmetry.

[0011] In an optional embodiment, the elastic support rod includes at least three, of which at least two are connected between the back surfaces of the left and right petals of the elastic support sheet and the middle part of the elastic support member, and at least one is connected between the back surface of the top petal of the elastic support sheet and the middle part of the elastic support member.

[0012] In an optional embodiment, the connection portion includes a first connection portion and a second connection portion, a first end of the elastic support member is rotatably connected to the first connection portion, and a second end of the elastic support member is slidably connected to the second connection portion along the extension direction of the elastic support member, and the second end of the elastic support member is used to adjust the elastic force of the elastic support member when sliding relative to the second connection portion.

[0013] In an optional manner, a mounting groove is provided on the second connecting portion, the second end of the elastic support member extends into the mounting groove and can slide within the mounting groove, an adjustment screw is rotatably provided in the mounting groove, one end of the adjustment screw is screwed onto the second end of the elastic support member extending into the mounting groove, a knob is provided on the other end of the adjustment screw, an opening is provided on the groove wall of the mounting groove, a part of the knob extends from the opening, and the part of the knob extending from the opening rotates under force to drive the rotation of the adjustment screw, and further drives the second end of the elastic support member to slide within the mounting groove, so as to adjust the elastic force of the elastic support member.

[0014] According to another aspect of an embodiment of the present invention there is provided a chair including a back support assembly as described above. Effect of the Invention

[0015] When the back support assembly provided in the embodiment of the present invention is applied to a chair, when a user sits on the chair and leans back, the back contacts the elastic support sheet and applies pressure to it. First, the elastic support sheet itself deforms to a certain extent according to the shape of the user's back and the pressure received, so that it can provide a basic cushioning and support. Then, the elastic support sheet transmits the pressure to the multiple elastic support rods, and the multiple elastic support rods receive the force and deform into an expanded state, so that the elastic support sheet moves backward a certain distance and can provide a relatively large degree of cushioning. After cushioning, the elastic force caused by the deformation provides sufficient support to the elastic support sheet, ensuring comfort when leaning back. Finally, the multiple elastic support rods further transmit the pressure to the elastic support members, which deform when subjected to force, providing further cushioning and support.

[0016] Based on this, the back support assembly provided in the embodiment of the present invention has an extended service life compared to the conventional mesh cloth support form, and the elastic deformation capabilities of the elastic support member, elastic support rod and elastic support sheet are not significantly affected, and can still effectively guarantee the cushioning and support effect when the user leans on it even after long-term use.

[0017] The above description is only an outline of the technical solution of the present invention. In order to make the technical solution of the present invention more clearly understood and to implement it in accordance with the content of the specification, and to make the above and other objectives, features and advantages of the present invention more comprehensible, the following specific embodiments of the present invention are listed. [Brief description of the drawings]

[0018] Various other benefits and advantages will become apparent to those skilled in the art upon reading the following detailed description of the preferred embodiments. The drawings are used only for the purpose of illustrating the preferred embodiments and are not to be construed as limiting the invention. In the drawings, like reference characters represent like elements throughout. [Figure 1] 1 is a schematic diagram of the structure of a back support assembly provided in an embodiment of the present invention; [Diagram 2] 2 is a schematic diagram of an exploded structure of a back support assembly provided in an embodiment of the present invention; FIG. [Diagram 3] FIG. 2 is a schematic diagram of the structure of the back support assembly provided in the embodiment of the present invention in a front view after the back support has been removed. [Figure 4] FIG. 2 is a schematic diagram of the structure of the back support assembly provided in the embodiment of the present invention when viewed from the rear after the back support has been removed. [Diagram 5] 2 is a schematic diagram of the front structure of a back support assembly provided in an embodiment of the present invention; FIG. [Figure 6A] FIG. 2 is a schematic diagram of the edge shape of a mesh cloth in a plan view provided in an embodiment of the present invention. [Figure 6B] 2 is a schematic diagram of the edge shape of a mesh cloth in a side view provided in an embodiment of the present invention; FIG. [Figure 7] FIG. 2 is a schematic diagram of the front structure of the elastic support sheet in the back support assembly provided in the embodiment of the present invention. [Figure 8] 2 is a schematic diagram of the front structure of an elastic support sheet and multiple elastic support rods in a back support assembly provided in an embodiment of the present invention. FIG. [Figure 9] 2 is a schematic diagram of the structure of the back support and elastic support member in the back support assembly provided in the embodiment of the present invention; [Figure 10] 1 is a schematic side view of a cross-sectional structure of a back support assembly provided in an embodiment of the present invention; [Figure 11] 4 is a schematic diagram of the fitting structure between the elastic support member and the inside of the mounting groove in the back support assembly provided in the embodiment of the present invention. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hereinafter, the embodiments of the technical solution of the present invention will be described in detail with reference to the drawings. The following embodiments are only for more clearly illustrating the technical solution of the present invention, and therefore are only used as examples, and do not limit the protection scope of the present invention.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention pertains, and the terms used herein are intended to describe particular embodiments only and are not intended to limit the present invention, and the terms "including", "having" and any variations thereof in the specification, claims and description of the drawings of the present invention are intended to cover a non-exclusive inclusion.

[0021] In describing the embodiments of the present invention, the technical terms "first," "second," etc. are used only to distinguish different objects, and cannot be understood as indicating or implying a relative importance, or as implying a number, a particular order, or a primary relationship of the indicated technical features. In describing the embodiments of the present invention, unless otherwise specified, "plurality" means two or more.

[0022] Reference to an "embodiment" in this specification means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present invention. The appearance of the term in various places in this specification does not necessarily refer to the same embodiment, nor does it refer to an embodiment that is mutually exclusive, independent, or an alternative to other embodiments. As will be understood explicitly and implicitly by those skilled in the art, the embodiments described herein can be combined with other embodiments.

[0023] In the description of the embodiments of the present invention, the term "and / or" merely describes the related relationship of related objects and indicates that three types of relationships can exist, for example, A and / or B can represent three cases: A exists, A and B exist simultaneously, and B exists. In addition, the character " / " in this specification generally indicates that the related objects before and after it are in an "or" relationship.

[0024] In describing the embodiments of the present invention, the term "plurality" means two or more (including two); similarly, "multiple groups" means two or more groups (including two groups), and "multiple sheets" means two or more sheets (including two sheets).

[0025] In describing the embodiments of the present invention, it should be understood that the orientations or positional relationships indicated by technical terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "up," "down," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," "clockwise," "counterclockwise," "axial direction," "radial direction," "circumferential direction," and the like are orientations or positional relationships shown based on the drawings, and are intended only to easily explain and simplify the embodiments of the present invention, and do not indicate or imply that the devices or elements shown must have a specific direction and be constructed and operated in a specific orientation, and therefore do not limit the embodiments of the present invention.

[0026] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the technical terms "attached", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, fixedly connected, detachably connected, or integral, mechanically connected, electrically connected, directly connected, indirectly connected via an intermediate medium, internal communication between two elements, or an interactive relationship between two elements. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific case.

[0027] A chair that uses an elastic mesh cloth to support the back generally has a ring-shaped mounting frame installed at the rear of the chair, the edges of the elastic mesh cloth fixed within the mounting frame, and when the elastic mesh cloth receives pressure from the user's back, it stretches, and the hollow area in the center of the mounting frame allows the elastic mesh cloth to deform backwards, thereby bonding the elastic mesh cloth to the user's back in a layer, and the elastic mesh cloth provides cushioning and support for the user's back.

[0028] As the service life extends, the elastic mesh is prone to irreversible deformation, i.e., the elastic mesh cannot fully recover to its original state even when it is not subjected to pressure, and therefore the elastic mesh fabric sags and is unable to provide reliable cushioning and support to the user's back.

[0029] In view of the above problems, the present invention first adopts an elastic support sheet to abut against the back of the user to provide support to the user, and the elastic support sheet itself can deform with the pressure applied by the back of the user, so that the comfort of leaning can be ensured. In addition, in order to provide sufficient cushioning and support to the user's back, the present invention further uses a double elastic support structure, specifically, a plurality of elastic support rods and an elastic support member are sequentially installed on the back of the elastic support sheet. The plurality of elastic support rods constitute a first elastic support structure, and the plurality of elastic support rods contained therein can deform to different degrees, thereby providing different degrees of cushioning and support to different positions of the elastic support sheet, that is, different magnitudes of support force can be provided to different positions of the user's back according to the situation where different positions of the user's back apply pressure. The elastic support member constitutes a second elastic support structure, and provides cushioning and support by the whole mainly composed of the elastic support sheet and the plurality of elastic support rods, thereby further ensuring the cushioning and support effect when the user's back is leaning, and improving the comfort of leaning. The overall back support form is completely different from that provided by mesh cloth, in which the elastic support sheet, the multiple elastic support rods and the elastic support members are all elastic, but compared with mesh cloth, they are all slightly more rigid in structure, so that as the service life extends, their own elastic deformation ability is not significantly affected, and they can still provide reliable cushioning and support to the user even after long-term use.

[0030] According to one aspect of an embodiment of the present invention, a back support assembly is provided, the back support assembly including but not limited to applications in home chairs, office chairs, ergonomic chairs, gaming chairs, and the like.

[0031] First, referring to Figures 1 to 3, Figure 1 shows the three-dimensional structure of the back support assembly provided in the embodiment of the present invention, Figure 2 shows the exploded structure of the back support assembly, and Figure 3 shows the structure of the back support assembly after the back support is removed. As shown in Figures 1 and 2, the back support assembly 100 includes a back support 110, an elastic support member 120, an elastic support rod 130, and an elastic support sheet 140. The back support 110 has a connection part 111, and the elastic support member 120 is belt-shaped and both ends are connected to the connection part 111, and the middle part of the elastic support member 120 is curved in a direction away from the connection part 111. As shown in FIG. 3, there are multiple elastic support rods 130, which are installed at angles to each other, with one end of each elastic support rod 130 connected to the side away from connection portion 111 in the middle part of elastic support member 120, and the other end curved away from elastic support member 120 and connected to the back of elastic support sheet 140, and the front of elastic support sheet 140 is used for leaning the back of the human body against it.

[0032] The back support 110 is the base of the entire back support assembly 100, and is typically fixedly connected at its bottom end to the chair bottom plate, and the back support 110 is used to attach and secure other components of the chair back. In the specific embodiment shown in Fig. 1, the bottom end of the back support 110 extends forward and is fixedly assembled to the chair bottom plate (not shown), thereby fixing the entire back support assembly 100 to the chair bottom plate.

[0033] As shown in Fig. 2, the elastic support member 120 may be in the form of a strip extending in the vertical direction, or in the form of a strip extending in the horizontal direction or in an oblique direction. In addition, a plurality of elastic support members 120 may be provided, and the plurality of elastic support members 120 may be parallel to each other or may cross each other.

[0034] In the specific embodiment shown in FIG. 2, the elastic support member 120 is curved back and forth in a spiral shape, and is keel-shaped with notches 121 formed on both sides. With this structure, when the elastic support member 120 is curved forward, the degree of curvature of the elastic support member 120 as a whole is reduced when the back is subjected to pressure from leaning on it, and the elastic support member 120 can provide cushioning and support. The elastic support member 120 can also deform to different degrees at different notches 121 depending on the magnitude of the force it receives, thereby providing a better cushioning and support effect to the user. Furthermore, in order to improve the support force of the elastic support member 120, the notches 121 may be constricted to have an inverted "T" shape in cross section as shown in FIG. 2, and the inside of the notches 121 is filled with a cushion block 122, which limits the degree of deformation at the notches 121 of the elastic support member 120, thereby improving the support force for the back of the human body. Of course, in other embodiments, the elastic support member 120 may adopt a structure such as an elastic sheet.

[0035] As shown in FIG. 3, the multiple elastic support rods 130 may be an integral structure with one end connected to each other, which end is connected to the elastic support member 120, and the other ends of the multiple elastic support rods 130 are curved toward the elastic support sheet 140 and each connected to a different position on the back surface of the elastic support sheet 140.

[0036] The multiple elastic support rods 130 being arranged at an angle to each other means that a certain angle is formed between each elastic support rod 130, and the included angle may be, for example, 30°, 60°, 90°, 120°, etc. By being installed in this manner, the multiple elastic support rods 130 as a whole form a support that spreads from the elastic support member 120 to the elastic support sheet 140, so that when the user's back is subjected to pressure applied to the elastic support sheet 140, the multiple elastic support rods 130 elastically deform with a tendency to expand, providing cushioning and support to the user's back.

[0037] When the front surface of the elastic support sheet 140 receives pressure from the user's back, it deforms according to the user's back due to its own elastic deformation ability, thereby ensuring comfort when leaning on it. Furthermore, one end of the elastic support rod 130 is connected to the rear surface of the elastic support sheet 140, and the other end is connected to the elastic support member 120, and the entire elastic support rod 130 is in a curved and extended state from the elastic support member 120 to the elastic support sheet 140, so that the multiple elastic support rods 130 are expanded and deformed when the user's back receives pressure transmitted through the elastic support sheet 140, thereby providing a reliable cushioning effect when the user's back leans on it.

[0038] When the back support assembly 100 provided in the embodiment of the present invention is applied to a chair, when a user sits on the chair and leans back, the back contacts the elastic support sheet 140 and applies pressure. First, the elastic support sheet 140 itself deforms to a certain extent according to the shape of the user's back and the pressure received, so that it can provide a basic cushioning and support. Then, the elastic support sheet 140 transmits the pressure to the multiple elastic support rods 130, and the multiple elastic support rods 130 receive the force and deform into an expanded state, so that the elastic support sheet 140 moves backward a certain distance and can provide a relatively large degree of cushioning. After cushioning, the elastic force due to the deformation provides sufficient support to the elastic support sheet 140, ensuring comfort when leaning. Finally, the multiple elastic support rods 130 further transmit the pressure to the elastic support members 120, which deform after receiving the force, providing further cushioning and support.

[0039] Based on this, the back support assembly 100 provided in the embodiment of the present invention has an extended service life compared to the conventional mesh cloth support form, and the elastic deformation capabilities of the elastic support member 120, the elastic support rod 130 and the elastic support sheet 140 are not significantly affected, and can still effectively guarantee the cushioning and support effect when the user leans on it even after long-term use.

[0040] When a user leans against the elastic support sheet 140, if the rigidity of the elastic support sheet 140 is relatively high, i.e., if it is not easily deformed, the corners of the edges of the elastic support sheet 140 are likely to cause discomfort; if the rigidity of the elastic support sheet 140 is relatively low, not only will the degree of deformation when leaning be too great and insufficient support be provided, but the connection point between its back surface and the elastic support rod 130 will also be likely to cause discomfort to the user's back.

[0041] Based on the above problems, in order to further improve the comfort of leaning, the present invention provides an embodiment, specifically referring to Fig. 4, which shows the structure of the back of an elastic support sheet and multiple elastic support rods. As shown in the figure, the elastic support sheet 140 includes a skeleton part 141 and a flexible part 142, the flexible part 142 is arranged around the outer periphery of the skeleton part 141, the rigidity of the skeleton part 141 is greater than that of the flexible part 142, and one end of the elastic support rod 130 that is separated from the elastic support member 120 is connected to the back of the skeleton part 141.

[0042] Based on this, in this embodiment, in a situation where the connection point between the elastic support sheet 140 and the elastic support rod 130 is likely to cause discomfort when the elastic support sheet 140 has low rigidity, the middle region of the elastic support sheet 140 is set as a highly rigid skeleton 141, one end of the elastic support rod 130 is connected to the back of the skeleton 141, and the highly rigid skeleton 141 prevents the force between the elastic support rod 130 and the back of the elastic support sheet 140 from being excessively transmitted from the front of the elastic support sheet 140 to the back of the user, thereby ensuring comfort for the user to lean on it. In a situation where the corners of the edges of the elastic support sheet 140 are likely to cause discomfort, the edge regions of the elastic support sheet 140, i.e., the peripheral regions of the skeleton 141, are set as flexible parts 142 with low rigidity, and the strong deformation ability of the flexible parts 142 is utilized to ensure that they can be deformed to a greater extent with the pressure of the user's back, thereby preventing discomfort to the user's back caused by the edges as much as possible.

[0043] Specifically, the skeletal portion 141 and the flexible portion 142 may be made of different materials so as to create a difference in rigidity between the two portions. The skeletal portion 141 and the flexible portion 142 made of different materials may be integrally molded, or may be produced and molded separately and then assembled and fixed to each other using a method such as adhesion or hot melt connection.

[0044] Also, for example, by forming one large-area support sheet and one small-area support sheet, and attaching the small-area support sheet to the middle region of the back of the large-area support sheet, the small-area support sheet and the middle portion of the large-area support sheet to which it is attached form a skeletal portion 141, and the portion of the large-area support sheet that is located at the edge and is not attached to the small-area support sheet forms a flexible portion 142.In such an embodiment, the small-area support sheet and the large-area support sheet may be made of the same material or different materials.

[0045] In addition to the embodiments provided above, the skeletal part 141 and the flexible part 142 may be made of the same material and have a difference in rigidity between them by changing other parameters. In response to this, the present invention provides an embodiment, specifically referring to FIG. 4 again, as shown in the figure, the skeletal part 141 and the flexible part 142 are made of the same material, and the skeletal part 141 and the flexible part 142 are of an integral structure, and the thickness of the skeletal part 141 is greater than the thickness of the flexible part 142, so that the rigidity of the skeletal part 141 is greater than the rigidity of the flexible part 142.

[0046] By using the same material for the skeletal part 141 and the flexible part 142, the integral molding process of the two can be simplified, and the elastic support sheet 140 can be efficiently manufactured. In addition, the integral structure of the skeletal part 141 and the flexible part 142 eliminates the assembly step of the two, which is advantageous to further improve the assembly efficiency of the back support assembly 100. Based on this, on the premise that the skeletal part 141 and the flexible part 142 use the same material, and considering that the thickness and rigidity of the material are directly proportional, the thickness of the skeletal part 141 is set to be greater than the thickness of the flexible part 142 to meet the requirement for the difference in rigidity between the skeletal part 141 and the flexible part 142 in the above embodiment.

[0047] Since the entire surface of the elastic support sheet is attached to the user's back, it is considered that when leaning on it for a long time, the ventilation of the user's back is limited, causing discomfort. To address this problem, the present invention provides an embodiment, specifically, referring again to FIG. 4, an air vent 1421 is provided in the flexible portion 142, as shown in the figure.

[0048] Since drilling holes affects the structural strength of elastic support sheet 140, skeletal portion 141, as the main supporting portion, has high rigidity, and drilling holes in skeletal portion 141 is likely to cause the risk of breaking due to excessive deformation when subjected to large pressure. Flexible portion 142 is just the opposite, being subjected to small pressure when leaned against, has low rigidity, and has strong deformability, and drilling holes in flexible portion 142 not only has a small effect on the structural strength of elastic support sheet 140 as a whole, but also further reduces the rigidity of flexible portion 142, i.e., further improves the deformation ability of flexible portion 142, thereby ensuring ventilation and further improving the comfort of leaning against it.

[0049] In order to provide more comprehensive cushioning and support to the entire back of the user, the present invention further provides an embodiment, specifically referring to Figures 1 and 2 again, as shown in the figures, the back support 110 further has a mesh cloth mounting frame 112 arranged around the outer periphery of the elastic support sheet 140, the mesh cloth mounting frame 112 is used to connect to the edge of the mesh cloth (not shown), the front of the elastic support sheet 140 abuts against the mesh cloth, and is used together with the mesh cloth to support the back of the human body against it.

[0050] It should be noted that Figures 1 and 2 only show a portion of the structure of the mesh cloth mounting frame 112, and furthermore, the mesh cloth mounting frame 112 may further include a semi-annular frame body connected to the upper part of the structure shown in the figures, so that the entire mesh cloth mounting frame 112 becomes a surrounding annular shape and is fixedly connected to the entire outer edge of the mesh cloth.

[0051] By abutting the front of the elastic support sheet 140 against the mesh cloth on the mesh cloth mounting frame 112, when the user leans back, the main force-receiving area in the middle of the user's back is provided with support by the elastic support sheet 140 and the multiple elastic support rods 130 and elastic support member 120 at its rear end, ensuring that sufficient support can be provided for the user; the support required for the edges of the user's back is small, and the support for this part can be provided by the mesh cloth, thereby ensuring comprehensive support and comfort.

[0052] In order to better bond the mesh fabric with the elastic support sheet 140 and improve the comfort of the user's leaning, the present invention further provides an embodiment, specifically referring to Fig. 5, which shows the front structure of the back support assembly. As shown in the figure, the elastic support sheet 140 is a four-petal shape that is mirror-symmetrical with respect to the vertical symmetric line.

[0053] A mesh cloth is generally a hyperboloid, that is, as shown in FIG. 6A, the edge 200 of the mesh cloth is a curved line with both left and right sides protruding forward and the middle concave backward in a plan view, and as shown in FIG. 6B, the edge 200 of the mesh cloth is a curved line that curves forward as a whole in a side view. In contrast, the elastic support sheet 140 of a general shape can be, for example, a square, a circle, an ellipse, etc., and none of them can satisfy sufficient abutment and bonding with the mesh cloth. In the petal-shaped elastic support sheet 140, each petal is like a cantilever, and one end of the cantilever is a free end, so that each petal can be deformed to a large extent, so that it can fully fit the shape of the mesh cloth and be closely bonded to the mesh cloth, so that the elastic support sheet 140 and the mesh cloth can provide the user with reliable back support.

[0054] In addition, if the elastic support sheet 140 is arranged in a petal shape with many petals, it is inevitable that the size of each petal will be thin, which is considered to be likely to cause damage. On the other hand, when the human body leans back, the pressure applied to the elastic support sheet 140 is distributed approximately symmetrically on the left and right sides with respect to the vertical symmetric line, and therefore, after comprehensively considering the degree of bonding between the elastic support sheet 140 and the mesh cloth and the structural stability of the elastic support sheet 140, the elastic support sheet 140 is arranged in a four-petal shape that is mirror-symmetrical with respect to the vertical symmetric line, among which, the structure that is mirror-symmetrical with respect to the vertical symmetric line matches the pressure distribution applied when the user's back leans back, and ensures that effective support can be provided to each position of the user's back, and the four-petal shape ensures that it is closely bonded to the mesh cloth, and does not have an excessive effect on the structural strength of the elastic support sheet 140.

[0055] As shown in the front view of elastic support sheet 140 in FIG. 7, in some embodiments, the vertical dimension D1 of the top petal of elastic support sheet 140 is greater than the vertical dimension D2 of the bottom petal.

[0056] Since the four-petal elastic support sheet 140 is mirror-symmetrical along a vertical line of symmetry, when the user leans back, the top petal directly provides support to the user's back spine; by setting the vertical size D1 of the top petal to be large, it can not only cover the user's spine and provide more comprehensive support to the user's spine, but also allow the cantilever structure formed in the top petal to deform to a greater extent, thereby providing better cushioning and support to the user's back spine.

[0057] When a user leans back, the bottom petals support the user's lower back, and in order to ensure a comfortable leaning experience, the lower back generally requires sufficient support; based on this, by setting the vertical size D2 of the bottom petals small, the deformable degree of the cantilever structure formed in the bottom petals is small, i.e., the bottom petals can provide stronger support.

[0058] In some embodiments of the present invention, for the four-petal elastic support sheet 140, the number of elastic support rods is also designed accordingly, specifically, refer to Fig. 4 again, and further combine with Fig. 8, which shows the structure of the elastic support sheet and the back of the elastic support rods. As shown in the figure, there are at least three elastic support rods 130, among which at least two elastic support rods 130 are connected between the back of the left and right two petals of the elastic support sheet 140 and the middle part of the elastic support member, and at least one elastic support rod 130 is connected between the back of the top petal of the elastic support sheet 140 and the middle part of the elastic support member 120.

[0059] As described above, when a user leans on it, the top petal receives a large pressure from the user's back spine and needs to have sufficient support, the left and right two petals mainly provide support to the two areas on both sides of the user's back and also need a large support, and the bottom petal is mainly used to provide support to the user's lower back and receives a small leaning pressure. Based on this, in order to save production costs and ensure the structural stability and comfort of the elastic support sheet 140, at least three elastic support rods 130 are respectively abutted against the top petal and the left and right two petals to support the elastic support sheet 140.

[0060] In the embodiment in which the vertical size D1 of the top petal is set larger than the vertical size D2 of the bottom petal, and three elastic support rods 130 are installed, the vertical size D2 of the bottom petal is set small, so that the elastic deformation degree is small when it receives force, and thus it is sufficient to provide reliable support for the user's waist. If another elastic support rod 130 is installed on the back of the bottom petal, the deformation degree of the bottom petal when it receives force is very low, and it cannot be better attached to the user's waist, which is likely to cause discomfort to the user's waist.

[0061] Considering that different users may have different requirements for cushioning and support effects, in order to meet the requirements of more users, the present invention further designs a means for adjusting the magnitude of the elastic force of the back support assembly, specifically referring to Fig. 9 and Fig. 10, Fig. 9 shows the structure of the back support assembly without the elastic support sheet and the elastic support rod, and Fig. 10 shows the side cross-sectional structure of the back support assembly. As shown in the figures, the connection part 111 includes a first connection part 1111 and a second connection part 1112, and the first end 1201 of the elastic support member 120 is rotatably connected to the first connection part 1111, and the second end 1202 of the elastic support member 120 is slidably connected to the second connection part 1112 along the extension direction of the elastic support member 120 (the direction shown by the double arrow A in Fig. 10). The second end 1202 of the elastic support member 120 is used to adjust the elastic force of the elastic support member 120 when sliding relative to the second connection part 1112.

[0062] Specifically, the second connection portion 1112 can be provided with a manual or electric adjustment mechanism, such as a push rod, a screw rod, a motor, a hydraulic or pneumatic cylinder, and the adjustment mechanism drives the slide of the second end 1202 of the elastic support member 120 to realize adjustment to the magnitude of the elastic force of the elastic support member 120.

[0063] 10, when the second end 1202 of the elastic support member 120 slides along the direction indicated by the upper left arrow in the double-headed arrow A in the figure, the first end 1201 of the elastic support member 120 rotates relative to the first connecting part 1111, and the middle part of the elastic support member 120 continues to protrude forward, i.e., the middle part of the elastic support member 120 in the figure protrudes to the left and the degree of curvature increases, at this time, the elastic force of the elastic support member 120 increases, and a larger back support force can be provided to the user. Conversely, when the second end 1202 of the elastic support member 120 slides along the direction indicated by the lower right arrow in the double-headed arrow A in the figure, the first end 1201 of the elastic support member 120 rotates relative to the first connecting part 1111, and the middle part of the elastic support member 120 moves backward, i.e., the middle part of the elastic support member 120 in the figure moves to the right and the degree of curvature decreases, at this time, the elastic force of the elastic support member 120 decreases, and the back support force provided to the user decreases accordingly.

[0064] In order to more easily adjust the magnitude of the back support force, the present invention further provides an embodiment, specifically referring to Figures 9 and 10, as shown in the figures, a mounting groove 11121 is provided in the second connecting part 1112, and the second end 1202 of the elastic support member 120 extends into the mounting groove 11121 and can slide within the mounting groove 11121. An adjustment screw 1113 is rotatably provided in the mounting groove 11121, one end of the adjustment screw 1113 is screwed into the second end 1202 of the elastic support member 120 that extends into the mounting groove 11121, and a knob 1114 is provided at the other end of the adjustment screw 1113. An opening 11122 is provided in the groove wall of the mounting groove 11121, and a part of the knob 1114 extends from the opening 11122. The portion of the knob 1114 extending from the opening 11122 rotates under force, driving the rotation of the adjustment screw 1113 and further driving the second end 1202 of the elastic support member 120 to slide within the mounting groove 11121, thereby being used to adjust the elastic force of the elastic support member 120.

[0065] A mounting groove 11121 is provided, and the second end 1202 of the elastic support member 120 is inserted into the mounting groove 11121, so that the inner wall of the mounting groove 11121 can act as a guide and limit for the sliding of the second end 1202. The adjustment screw 1113 and the second end 1202 are screwed together to drive the sliding of the second end 1202, which makes adjustment easy and labor-saving. An opening 11122 for allowing the knob 1114 of the adjustment screw 1113 to protrude is provided on the groove wall of the mounting groove 11121, so that the user can easily bias the part of the knob 1114 protruding from the opening 11122 by hand to drive the rotation of the adjustment screw 1113, thereby realizing the adjustment of the magnitude of the elastic force of the elastic support member 120.

[0066] In order to ensure that the sliding direction of the second end 1202 of the elastic support member 120 is accurate and reliable, and to effectively adjust the magnitude of the elastic force of the elastic support member, the present invention further provides an embodiment, specifically referring to Fig. 11, which shows a structure in which the second end of the elastic support member is fitted into the mounting groove. As shown in the figure, a limit post 11123 is provided in the mounting groove 11121, and a guide hole 12021 is provided at the second end 1202, and the limit post 11123 is slidably fitted into the guide hole 12021, which plays the role of a guide and limit for the sliding of the second end 1202.

[0067] According to another aspect of the present invention, there is provided a chair including the back support assembly according to any of the above embodiments, wherein the body of the chair includes a bottom plate, and a bottom end of a back rest in the back support assembly is fixedly connected to the bottom plate to assemble and fix the back support assembly to the body of the chair.

[0068] Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention, but are not intended to limit the same, and the present invention has been described in detail with reference to the above embodiments, but those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified or some or all of the technical features can be replaced with equivalents, and such modifications or replacements do not cause the essence of the corresponding technical solutions to depart from the scope of the technical solutions of the embodiments of the present invention. In particular, the technical features mentioned in the embodiments can be arbitrarily combined as long as there is no structural contradiction. [Explanation of symbols]

[0069] 100...back support assembly, 110...back support, 111...connection part, 1111...first connection part, 1112...second connection part, 11121...mounting groove, 11122...opening, 11123...limit post, 1113...adjustment screw, 1114...knob, 112...mesh cloth mounting frame, 120...elastic support member, 1201...first end, 1202...second end, 12021...guide hole, 121...notch, 122...cushion block, 130...elastic support rod, 140...elastic support sheet, 141...skeletal portion, 142...flexible portion, 1421...ventilation hole 200...Mesh cloth edge.

Claims

1. The back support includes an elastic support member, an elastic support rod, and an elastic support sheet. The back support has a connecting portion, the elastic support member is belt-shaped, and both ends are connected to the connecting portion, and the middle portion of the elastic support member is curved in a direction away from the connecting portion, The back support assembly is characterized in that there are multiple elastic support rods, the multiple elastic support rods are installed at angles to each other, one end of each elastic support rod is connected to the side away from the connection portion at the middle part of the elastic support member, and the other end is curved to the side away from the elastic support member and connected to the back of the elastic support sheet, and the front side of the elastic support sheet is used to lean the back of the human body against it.

2. The back support assembly of claim 1, characterized in that the elastic support sheet includes a skeleton portion and a flexible portion, the flexible portion is arranged around the outer periphery of the skeleton portion, the rigidity of the skeleton portion is greater than the rigidity of the flexible portion, and the end of the elastic support rod away from the elastic support member is connected to the back surface of the skeleton portion.

3. 3. The back support assembly of claim 2, wherein the skeletal portion and the flexible portion are made of the same material and are of a unitary structure, and the thickness of the skeletal portion is greater than the thickness of the flexible portion, such that the stiffness of the skeletal portion is greater than the stiffness of the flexible portion.

4. 3. The back support assembly of claim 2, wherein said flexible portion is ventilated.

5. The back support assembly of claim 1, characterized in that the back support further has a mesh cloth mounting frame arranged around the outer periphery of the elastic support sheet, the mesh cloth mounting frame is used to connect to the edge of the mesh cloth, the front side of the elastic support sheet abuts against the mesh cloth, and is used to lean the back of the human body together with the mesh cloth.

6. 6. The back support assembly of claim 5, wherein said elastic support sheet is four-petaled and mirror-symmetrical about a vertical line of symmetry.

7. The back support assembly of claim 6, characterized in that the elastic support rods include at least three, of which at least two are connected between the backs of the left and right petals of the elastic support sheet and the middle portion of the elastic support member, and at least one is connected between the back of the top petal of the elastic support sheet and the middle portion of the elastic support member.

8. 2. The back support assembly of claim 1, wherein the connection portion includes a first connection portion and a second connection portion, a first end of the elastic support member is rotatably connected to the first connection portion, a second end of the elastic support member is slidably connected to the second connection portion along the extension direction of the elastic support member, and the second end of the elastic support member is used to adjust the elastic force of the elastic support member when sliding relative to the second connection portion.

9. a mounting groove is provided in the second connection portion, and a second end of the elastic support member extends into the mounting groove and can slide within the mounting groove; an adjustment screw is rotatably provided in the mounting groove, one end of the adjustment screw is screwed into a second end of the elastic support member that extends into the mounting groove, and a knob is provided on the other end of the adjustment screw; 9. The back support assembly according to claim 8, characterized in that an opening is provided in the groove wall of the mounting groove, a part of the knob extends from the opening, and the part of the knob extending from the opening receives a force to rotate and drive the rotation of the adjustment screw, and further drives the second end of the elastic support member to slide within the mounting groove, so as to adjust the elastic force of the elastic support member.

10. A chair comprising a back support assembly according to any one of claims 1 to 9.

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