Seat back

Abstract

The utility model relates to the technical field of seats, in particular to a seat back, which comprises a seat back support frame with the lower end part used for being connected onto a tray, and a seat back frame connected onto the seat back support frame, the two sides of the lower end of the chair back supporting frame are respectively connected with a waist leaning support, the upper end and the lower end of the waist leaning support are fixedly connected to the chair back frame, and the waist leaning support is in a forwards-arched circular arc shape relative to the chair back supporting frame; elastic supporting surface layers are connected to the chair back frame and the waist rest supports, the elastic supporting surface layer in the chair back frame forms a chair back supporting surface, and the elastic supporting surface layer between the two waist rest supports forms a waist rest supporting surface. The scheme has the advantages that the supporting strength is improved, the stability is enhanced, the waist fitting degree is improved, and the comfort and the practicability are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of seat, especially to a seat back. BACKGROUND

[0002] Chair is a kind of furniture commonly seen in daily life, as a seat with backrest and armrest, not only pursuit of beautiful and fashionable in modern design, also combined with the technology element, to improve people's life convenience.With the continuous improvement of life quality, people put forward higher requirements to the functionality and comfort of furniture, and the design of chair is no longer limited to simple seat function.In the prior art, for example, the Chinese utility model patent with the announcement number "CN201019315Y" discloses an office chair waist support structure.The structure includes a chair back bracket, a chair back backplate fixed on the chair back bracket and a chair back frame fixed on the chair back backplate.The chair back bracket has a counterbore, the chair back backplate is a panel with a certain curvature, and has a screw hole corresponding to the counterbore, a buckle slot and a through hole.The chair back frame is a panel with a certain curvature, corresponding to the buckle slot and the through hole of the chair back backplate, and has a buckle and a screw column on the upper part, and the lower part is slightly bent backward, and has a hole, forming a chair back frame frame, and the protruding waist support rod on the frame, and a waist support on the waist support rod.The screw is arranged in the counterbore and the screw hole, the buckle is buckled on the buckle slot, and the screw is arranged in the through hole and the screw column.However, this technical scheme has some deficiencies.Firstly, the support connection mode of the waist support by a strip plate from the bottom of the chair back frame to the upper part has limited support strength.This leads to the shaking of the human waist when leaning against the waist support, thereby reducing the stability and practical comfort of the chair, especially not suitable for people with heavy weight.Secondly, the waist support in the technical scheme still does not have ideal fit for the waist, which reduces the use comfort and affects the overall use effect.In addition, the existing chair back design often ignores the ergonomics principle, and cannot effectively support the natural curvature of human spine.This may lead to improper sitting posture for a long time, and cause health problems such as back pain.At the same time, the existing chair back structure usually lacks sufficient elastic support, and cannot be adjusted according to the needs of different body shapes and sitting postures, which further limits the comfort and practicality of the chair.

[0003] In view of the above problems, the prior art needs to be improved. SUMMARY

[0004] In order to solve the above problems, the purpose of the utility model is to provide a seat back, which has the advantages of improving support strength, enhancing stability, improving waist fit, improving comfort and practicality.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] The utility model provides a seat back, technical solutions are as follows: including the chair back support frame for connecting on the tray of lower end part and the chair back frame connected on the chair back support frame, the lower end of the chair back support frame is connected with the waist support frame respectively on both sides, and the upper and lower ends of the waist support frame are fixedly connected on the chair back frame, and the waist support frame presents the circular arc shape of the arch forward relative to the chair back support frame, and the elastic support surface layer is connected on the chair back frame and the waist support frame, and the elastic support surface layer in the chair back frame forms the chair back support surface, and the elastic support surface layer between the two waist support frames forms the waist support surface.

[0007] Further, the utility model still provides, the most top of waist support frame arches forward is close to the upper end of waist support frame, and the first arc surface is formed between the most top of waist support frame and its upper end, and the second arc surface is formed between the most top of waist support frame and its lower end, and the curvature of first arc surface is greater than the curvature of second arc surface.

[0008] Further, the utility model still provides, the lower end of chair back frame is bent to the rear arc, and the curved portion of the lower end of chair back frame is connected on the waist support frame, and the reinforcing crossbeam that is connected left and right is still provided on the chair back frame, and the reinforcing crossbeam is connected on the chair back frame on both ends of two waist support frame upper end parts, and the reinforcing crossbeam presents the circular arc shape of the arch rearward.

[0009] Further, the utility model still provides, the chair back support frame includes main frame body and support beam, the main frame body presents the U shape, and the lower end of main frame body protrudes to the front and constitutes the connecting portion for connecting the tray, and the support beam is in the U shape opening of main frame body, and its both end parts are integrally connected on main frame body, and the lower end of chair back frame is fixedly connected on chair back support frame, and the support beam of chair back support frame and the main frame body above both end parts thereof support the lower frame edge of chair back frame and the side frame edge on both sides thereof respectively.

[0010] Further, the utility model still provides, the rear end face of chair back support frame is fixedly connected with the decorative rear cover.

[0011] Further, the utility model still provides, the plurality of clamping hooks for clamping into the clamping opening are arranged on the decorative rear cover.

[0012] From the above, the seat back provided by the application comprises a seat back support frame connected to a tray at a lower end, and a seat back frame connected to the seat back support frame; the lower ends of the seat back support frame are connected with lumbar support frames on both sides, the upper and lower ends of the lumbar support frames are fixed to the seat back frame, and the lumbar support frames are in an arc shape that arches forward relative to the seat back support frame; the seat back frame and the lumbar support frames are connected with elastic support surface layers, the elastic support surface layer in the seat back frame forms a seat back support surface, and the elastic support surface layer between the two lumbar support frames forms a lumbar support surface. Through the design of the lumbar support frames and the application of the elastic support surface layers, the support strength of the seat back is effectively improved, the stability of the chair is enhanced, the lumbar fit is improved, and the comfort and practicability are improved. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 A side view of a seat back provided by the application.

[0014] Figure 2 A back view of a seat back provided by the application.

[0015] Figure 3 An exploded view of a seat back provided by the application.

[0016] Figure 4 An installation view of a seat back frame and a lumbar support frame. DETAILED DESCRIPTION

[0017] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0018] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0019] The orientation or positional relationship indicated by the terms "clockwise", "counterclockwise", and the like is based on the orientation or positional relationship shown in the drawings, and is only used to facilitate the description of the present application and simplify the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0020] In addition, the terms "first", "second", etc. are used only for descriptive purposes and should not be construed as indicating or implying relative importance or an indicated number of technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified and limited, the meaning of "a plurality of" is two or more, unless otherwise explicitly limited.

[0021] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0022] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include the direct contact of the first and second features, or it can include the contact of the first and second features through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include the vertical direction of the first feature above and obliquely above the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The "lower", "lower" and "lower" of the first feature to the second feature include the vertical direction of the first feature below and obliquely below the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0023] As Figures 1-4As shown, the present embodiment relates to a seat backrest, including a backrest support frame 1 at the lower end for connecting to the tray, and a backrest frame 2 connected to the backrest support frame 1; the lower end of the backrest support frame 1 is connected with a lumbar support bracket 3 on both sides, and the upper and lower ends of the lumbar support bracket 3 are fixed to the backrest frame 2, and the lumbar support bracket 3 presents a forward arching arc shape relative to the backrest support frame 1; the backrest frame 2 and the lumbar support bracket 3 are connected with an elastic support surface layer, and the elastic support surface layer in the backrest frame 2 forms a backrest support surface, and the elastic support surface layer between the two lumbar support brackets 3 forms a lumbar support surface. The technical scheme provides the basic structure of the seat backrest through the cooperation of the backrest support frame 1 and the backrest frame 2, the lower end of the backrest support frame 1 is used for connecting the tray, and the fixed basis of the backrest is ensured. The lumbar support bracket 3 is connected to the lower end of the backrest support frame 1 on both sides and is fixed to the backrest frame 2 through the upper and lower ends, forming a stable support structure. The design of the forward arching arc shape of the lumbar support bracket 3 makes the lumbar support bracket 3 better fit the human waist curve and provide more comfortable support. The elastic support surface layer is connected to the backrest frame 2 and the lumbar support bracket 3, the elastic support surface layer in the backrest frame 2 forms a backrest support surface, and the elastic support surface layer between the two lumbar support brackets 3 forms a lumbar support surface. This design not only increases the elasticity of the backrest, but also improves the support effect of the waist, thereby solving the problem of insufficient stability and comfort of the seat backrest when providing waist support. Compared with the prior art, the technical scheme significantly improves the stability and comfort of the seat backrest by optimizing the structure and connection method of the lumbar support bracket 3, and is especially suitable for long-term use and heavy people.

[0024] In the above scheme, the forward arching design of the lumbar support bracket 3 can be realized in various ways. For example, the lumbar support bracket 3 can be made of metal material and formed into an arc shape through bending process; or made of plastic material and directly formed into the required arching shape through injection molding process. Further, the elastic support surface layer can be made of high-elasticity sponge material or composed of net fabric and elastic material to provide better support and comfort. Specifically, the connection method of the backrest frame 2 and the lumbar support bracket 3 can be realized by welding, bolt fixing or buckle connection, etc. to ensure the stability and reliability of the structure. As a preferred embodiment, the upper and lower ends of the lumbar support bracket 3 can be fixed to the backrest frame 2 by welding to enhance the rigidity of the overall structure.

[0025] Further, the application also proposes that the topmost end 30 of the lumbar support 3 that arches forward is close to the upper end of the lumbar support 3, and the first arc surface 31 is formed between the topmost end 30 and the upper end of the lumbar support 3, and the second arc surface 32 is formed between the topmost end 30 and the lower end of the lumbar support 3; the curvature of the first arc surface 31 is greater than that of the second arc surface 32. Specifically, the curvature of the first arc surface 31 can be achieved by adjusting the radius of the arc surface, for example, the radius of the first arc surface 31 can be set to be smaller than that of the second arc surface 32, so that the curvature of the first arc surface 31 is greater. In addition, the connection between the first arc surface 31 and the second arc surface 32 can be designed to be smooth transition, so as to avoid discomfort in the use process. As a preferred embodiment, the curvature of the first arc surface 31 can be optimized according to the curve of the human waist, so as to ensure that the lumbar support 3 can better fit the waist and provide more effective support. Thus, by adjusting the curvatures of the first arc surface 31 and the second arc surface 32, the curvature of the first arc surface 31 is greater than that of the second arc surface 32, so as to optimize the support effect of the lumbar support 3. This design makes the lumbar support 3 have greater curvature in the area close to the upper end, which can better fit the human waist curve and provide more effective support. At the same time, the smaller curvature of the second arc surface 32 ensures the stability of the lumbar support 3 at the lower end, avoiding insufficient support caused by excessive bending. Through the differential design of the arc surface curvature, the lumbar support 3 can more effectively disperse the waist pressure and improve the comfort and support effect of the user. Compared with the prior art, the design of the application has significant advantages in improving the support effect and stability of the lumbar support 3, and is especially suitable for use in scenarios that require long-time sitting posture.

[0026] In addition, the lower end of the backrest frame 2 is arc-shapedly bent rearward, and the lumbar support bracket 3 is connected to the bent portion of the lower end of the backrest frame 2; the backrest frame 2 is further provided with a reinforcing cross beam 21 connecting the left and right sides, and the two ends of the reinforcing cross beam 21 are respectively connected to the backrest frame 2 beside the upper end portions of the two lumbar support brackets 3; the reinforcing cross beam 21 is in a rear-arched arc shape. Specifically, the lower end of the backrest frame 2 is arc-shapedly bent rearward, which increases the overall structural strength of the backrest frame 2, and the lumbar support bracket 3 is connected to the bent portion of the lower end of the backrest frame 2, so that the connection between the lumbar support bracket 3 and the backrest frame 2 is more stable. The reinforcing cross beam 21 further enhances the stability of the backrest frame 2, and the two ends thereof are respectively connected to the backrest frame 2 beside the upper end portions of the two lumbar support brackets 3, forming a rear-arched arc structure, which effectively disperses the pressure borne by the lumbar support bracket 3 and improves the stability and connection strength of the overall structure. As a preferred embodiment, the angle of the arc-shaped bending of the lower end of the backrest frame 2 can be adjusted according to actual needs to ensure the best supporting effect. The material of the reinforcing cross beam 21 can be high-strength steel or aluminum alloy to further improve its carrying capacity and durability. In addition, the arching curvature of the reinforcing cross beam 21 can also be optimized according to the ergonomics principle to better adapt to the curve of the human waist and provide a more comfortable supporting experience. Thus, the technical scheme of the present application effectively solves the technical problems of insufficient structural stability of the backrest frame 2 and insufficient connection strength of the lumbar support bracket 3 by arc-shaped bending of the lower end of the backrest frame 2 and the arrangement of the reinforcing cross beam 21. Compared with the prior art, the technical scheme of the present application not only improves the overall structural strength of the backrest frame 2, but also enhances the connection stability of the lumbar support bracket 3 and the backrest frame 2, thereby significantly improving the stability and comfort of the seat.

[0027] As Figure 3As shown, the chair back support frame 1 includes a main frame body 11 and a support beam 12; the main frame body 11 is in the shape of a "U", and the lower end of the main frame body 11 protrudes forward to form a connecting part 13 for connecting the tray; the support beam 12 is located in the U-shaped opening of the main frame body 11, and its two end parts are integrally connected to the main frame body 11; the lower end of the chair back frame 2 is fixed to the chair back support frame 1, so that the support beam 12 of the chair back support frame 1 and the main frame body 11 above its two end parts support the lower frame edge of the chair back frame 2 and the side frame edges on both sides, respectively. The "U" design of the main frame body 11 allows the lower end to protrude forward to form the connecting part 13, facilitating stable connection with the tray. The support beam 12 is located in the U-shaped opening of the main frame body 11, and its two end parts are integrally connected to the main frame body 11, which further enhances the support strength. The lower end of the chair back frame 2 is fixed to the chair back support frame 1, and the support beam 12 and the two end parts of the main frame body 11 jointly support the lower frame edge and the side frame edges of the chair back frame 2, ensuring stable connection of the chair back frame 2, reducing shaking, and improving the comfort of use. Specifically, the "U" design of the main frame body 11 can be achieved in various ways, such as using metal materials or high-strength plastic materials to ensure its structural strength and durability. The integral connection of the support beam 12 and the main frame body 11 can be achieved through welding, riveting, or one-piece molding process to enhance the stability of the overall structure. The fixed connection of the chair back frame 2 and the chair back support frame 1 can be achieved through bolt connection, buckle connection, or welding to ensure the firmness of the connection. Thus, the technical scheme effectively solves the technical problems of complex structure and unstable connection of the chair back support frame 1 through the "U" design of the main frame body 11 and the integral connection of the support beam 12. Compared with the prior art, this scheme not only simplifies the structure, but also improves the support strength and connection stability, reduces the shaking of the chair back frame 2, and improves the comfort of use.

[0028] Further, the application also proposes that a decorative rear cover 4 is fixed to the rear end face of the chair back support frame 1. The decorative rear cover 4 can be fixed to the rear end face of the chair back support frame 1 in various ways, such as buckle connection, screw fixation, or adhesion. The material of the decorative rear cover 4 can be plastic, metal, or composite material, and the specific material can be adjusted according to actual needs. The shape and size of the decorative rear cover 4 can be customized according to the rear end face of the chair back support frame 1 to ensure that it can completely cover the rear end face and improve the overall aesthetics. Through the above technical scheme, the rear end face of the chair back support frame 1 is covered by the decorative rear cover 4, avoiding the problem of affecting the overall visual effect due to complex structure or unattractive material. The fixed connection of the decorative rear cover 4 ensures its stability and prevents it from falling off or shifting, further enhancing the practicality and aesthetics of the product. Compared with the prior art, the technical scheme of the application not only solves the problem of insufficient aesthetics of the rear end face of the chair back support frame 1, but also improves the overall quality and user experience of the product through the fixed connection of the decorative rear cover 4.

[0029] As shown in Figure 3 The chair back support frame 1 is provided with a plurality of clamping holes 15, and the decorative rear cover 4 is provided with a plurality of clamping hooks 41 for clamping into the clamping holes 15. The design of the clamping holes 15 and the clamping hooks 41 enables the decorative rear cover 4 to be stably connected to the chair back support frame 1, avoiding the situation that the decorative rear cover 4 is loose or falls off during use. Specifically, the clamping holes 15 can be designed as grooves or holes, and the clamping hooks 41 can be designed as protrusions or hook-shaped structures matching the shape of the clamping holes 15. As a preferred embodiment, the number and position of the clamping holes 15 and the clamping hooks 41 can be adjusted according to actual needs to ensure the uniformity and stability of the connection. Through the clamping of the clamping hooks 41 into the clamping holes 15, the connection between the decorative rear cover 4 and the chair back support frame 1 not only simplifies the installation process, but also improves the reliability and stability of the connection. This connection effectively solves the technical problem of unstable connection between the decorative rear cover 4 and the chair back support frame 1, so that the decorative rear cover 4 can remain stable during use and is not easy to loosen or fall off. Compared with the prior art, the technical scheme has higher practicability and reliability, and can better meet the user's demand for furniture stability and aesthetics.

[0030] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0031] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those skilled in the art can make changes, modifications, replacements and variations to the above embodiments without departing from the principles and purposes of the present application within the scope of the present application.

Claims

1. A seat back comprising a back support frame (1) having a lower end portion for attachment to a tray, and a back frame (2) attached to the back support frame (1); characterized in that: The lower ends of the chair back support frame (1) are respectively connected with lumbar support frames (3), the upper and lower ends of the lumbar support frame (3) are fixedly connected with the chair back frame (2), the lumbar support frame (3) presents a forward arching arc shape relative to the chair back support frame (1); the chair back frame (2) and the lumbar support frame (3) are connected with elastic support surface layers, the elastic support surface layer in the chair back frame (2) forms a chair back support surface, and the elastic support surface layer between the two lumbar support frames (3) forms a lumbar support surface.

2. A seat back as defined in claim 1, characterized by: The forward arching top end (30) of the lumbar support frame (3) is close to the upper end of the lumbar support frame (3), a first arc surface (31) is formed between the top end (30) and the upper end of the lumbar support frame (3), and a second arc surface (32) is formed between the top end (30) and the lower end of the lumbar support frame (3); the curvature of the first arc surface (31) is greater than the curvature of the second arc surface (32).

3. A seat back as defined in claim 2, wherein: The lower end of the chair back frame (2) is rearwardly arc-shaped bent, and the lumbar support frame (3) is connected to the bent portion of the lower end of the chair back frame (2); the chair back frame (2) is further provided with a reinforcing cross beam (21) connecting the left and right sides, the two ends of the reinforcing cross beam (21) are respectively connected to the chair back frame (2) beside the upper end of the two lumbar support frames (3); the reinforcing cross beam (21) presents a rearward arching arc shape.

4. A seat back as defined in claim 1, wherein: The chair back support frame (1) comprises a main frame body (11) and a support beam (12); the main frame body (11) presents a "U" shape, the lower end of the main frame body (11) protrudes forward to form a connecting portion (13) for connecting a tray; the support beam (12) is located in the U-shaped opening of the main frame body (11), and the two end portions of the support beam (12) are integrally connected to the main frame body (11); the lower end of the chair back frame (2) is fixedly connected to the chair back support frame (1), so that the support beam (12) of the chair back support frame (1) and the main frame body (11) above the two end portions of the support beam (12) support the lower frame edge of the chair back frame (2) and the side frame edges on the two sides of the chair back frame (2), respectively.

5. A seat back as defined in claim 4, wherein: The rear end surface of the chair back support frame (1) is fixedly connected with a decorative rear cover (4).

6. A seat back as defined in claim 4, wherein: The chair back support frame (1) is provided with a plurality of clamping openings (15), and the decorative rear cover (4) is provided with a plurality of clamping hooks (41) for clamping into the clamping openings (15).

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