Chair back structure of chair

Abstract

The chair back structure comprises a chair back body frame, a waist leaning frame and a spring assembly, the chair back body frame comprises a first cross beam part, a second cross beam part and a mounting part which are integrally formed from top to bottom, and the front side of the second cross beam part is detachably connected with the upper portion of the waist leaning frame; and the lower part of the waist leaning frame is connected to the two sides of the chair back body frame through spring assemblies. The waist leaning frame is arranged on the front side of the chair back body frame and can better support the waist of a user, the upper portion of the waist leaning frame is detachably connected with the chair back body frame, the lower portion of the waist leaning frame is connected with the chair back body frame through the spring assembly, the assembling procedure of the waist leaning frame and the chair back body frame becomes simple, and the assembling efficiency is improved. And the spring assembly provides corresponding supporting force at the lower part of the waist leaning frame, so that the connection between the waist leaning frame and the chair back body frame is more stable.

Description

Technical Field

[0001] This application relates to the field of chair technology, specifically to a chair back structure. Background Technology

[0002] With the increasing demand for ergonomics in modern office and home settings, the design of lumbar support structures for chairs has become an important research direction in the field of functional seating. Traditional chair back structures generally adopt a one-piece curved surface design, which can conform to the curve of the human spine to a certain extent, but the comfort of the chair back is poor in actual use.

[0003] Currently, many chairs on the market add lumbar support to improve comfort, but there are still some drawbacks. First, too many parts are used to connect the lumbar support to the chair back, making the assembly process complicated. Second, the connection between the lumbar support and the chair back is relatively weak, and the connecting parts are easily damaged. Utility Model Content

[0004] Therefore, this application provides a chair back structure to solve the technical problems of cumbersome chair back assembly and weak connection between the lumbar support and the chair back body in the prior art.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] A chair back structure includes a chair back body frame, a lumbar support frame, and a spring assembly. The chair back body frame includes a first crossbeam portion, a second crossbeam portion, and a mounting portion integrally formed from top to bottom. The front side of the second crossbeam portion is detachably connected to the upper part of the lumbar support frame, and the lower part of the lumbar support frame is connected to both sides of the chair back body frame through the spring assembly.

[0007] Optionally, a limiting groove is provided on the front side of the second crossbeam, and a first mounting hole is provided in the limiting groove. A protrusion adapted to the limiting groove is provided on the rear side of the upper part of the waist support frame, and a second mounting hole is provided on the protrusion. The protrusion is assembled in the limiting groove, the first mounting hole and the second mounting hole are opposite to each other, and fixing screws are installed in the first mounting hole and the second mounting hole.

[0008] Further optionally, a first slot is provided on the rear side of the lower part of the lumbar support frame, and a second slot corresponding to the first slot is provided on the backrest body frame, with both ends of the spring assembly respectively installed on the first slot and the second slot.

[0009] Further optionally, the spring assembly includes a spring member, a spring sleeve, and a spring pin. The spring sleeve is disposed on the outside of the spring member. One end of the spring member and the spring sleeve is fixed to the first slot by the spring pin, and the other end of the spring member and the spring sleeve is fixed to the second slot by the spring pin.

[0010] Optionally, the chair back structure further includes an identification element, which is detachably disposed on the rear side of the chair back body frame and covers the first mounting hole.

[0011] Optionally, the chair back structure further includes a headrest connecting block, which includes a connecting block body and a detachably connected fixing plate. The connecting block body and the fixing plate are connected to form a fixing groove. The headrest connecting block is snapped onto the first crossbeam through the fixing groove. The connecting block body is provided with a sliding groove for connecting the headrest component.

[0012] Compared with the prior art, this application has at least the following beneficial effects:

[0013] A chair back structure includes a chair back body frame, a lumbar support frame, and a spring assembly. The chair back body frame includes a first crossbeam, a second crossbeam, and a mounting portion integrally formed from top to bottom. The front side of the second crossbeam is detachably connected to the upper part of the lumbar support frame, and the lower part of the lumbar support frame is connected to both sides of the chair back body frame via the spring assembly. The lumbar support frame, located at the front of the chair back body frame, provides better lumbar support for the user. The detachable connection between the upper part of the lumbar support frame and the chair back body frame, and the connection between the lower part of the lumbar support frame and the chair back body frame via the spring assembly, not only simplifies the assembly process of the lumbar support frame and the chair back body frame, but also provides corresponding support force at the lower part of the lumbar support frame, making the connection between the lumbar support frame and the chair back body frame more stable. Attached Figure Description

[0014] To more intuitively illustrate the prior art and this application, exemplary drawings are provided below. It should be understood that the specific shapes and structures shown in the drawings should not generally be regarded as limiting conditions for implementing this application; for example, based on the technical concept disclosed in this application and the exemplary drawings, those skilled in the art are able to easily make conventional adjustments or further optimizations to the addition / reduction / classification, specific shapes, positional relationships, connection methods, size ratios, etc. of certain units (components).

[0015] Figure 1 A schematic diagram of a chair back structure provided in an embodiment of this application;

[0016] Figure 2 An exploded view of a chair back structure provided in an embodiment of this application;

[0017] Figure 3 An exploded view from a second perspective of a chair back structure provided in an embodiment of this application;

[0018] Figure 4 This is a diagram illustrating the usage state of a chair back structure provided in an embodiment of this application.

[0019] Explanation of reference numerals in the attached figures:

[0020] 1. Backrest frame; 2. Lumbar support frame; 3. Spring assembly; 301. Spring component; 302. Spring sleeve; 303. Spring pin; 4. First crossbeam; 5. Second crossbeam; 6. Mounting part; 7. Limiting groove; 8. Protrusion; 9. First slot; 10. Second slot; 11. Identification component; 12. Headrest connecting block; 121. Connecting block body; 122. Fixing plate; 123. Slide groove; 13. Seat; 14. Headrest component. Detailed Implementation

[0021] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Example 1

[0023] refer to Figure 1-4 As shown, Embodiment 1 provides a chair back structure, including a chair back body frame 1, a lumbar support frame 2, and a spring assembly 3. The chair back body frame 1 includes a first crossbeam portion 4, a second crossbeam portion 5, and a mounting portion 6 integrally formed from top to bottom. The sides of the first crossbeam portion 4, the second crossbeam portion 5, and the mounting portion 6 are connected by two vertical beams to form a frame. The second crossbeam portion 5 divides the chair back body frame 1 into an upper frame and a lower frame. The lumbar support frame 2 is a frame formed by the upper and lower crossbeams and the left and right vertical beams.

[0024] The front side of the second crossbeam 5 is detachably connected to the upper part of the lumbar support frame 2, that is, the front side of the second crossbeam 5 is detachably connected to the rear side of the upper crossbeam of the lumbar support frame 2. The lower part of the lumbar support frame 2 is connected to both sides of the chair back body frame 1 through the spring assembly 3, that is, the rear side of the lower crossbeam of the lumbar support frame 2 is connected to the front side of the vertical beam of the chair back body frame 1 through the spring assembly 3.

[0025] Existing chair back structures either employ a one-piece curved design, resulting in poor user comfort when leaning against the chair; or they use too many parts to connect the lumbar support to the chair back, which not only makes the assembly process cumbersome, but also only connects the upper part of the lumbar support to the chair back with screws, leaving the lower part of the lumbar support movable. If the user leans against it with too much force, it can easily damage the chair back or loosen the connection between the lumbar support and the chair back.

[0026] In this application, the lumbar support frame 2 is located on the front side of the chair back body frame 1, which can provide better support for the user's waist. The upper part of the lumbar support frame 2 is detachably connected to the chair back body frame 1, and the lower part of the lumbar support frame 2 is connected to the chair back body frame 1 through the spring assembly 3. This not only simplifies the assembly process of the lumbar support frame 2 and the chair back body frame 1, but also provides corresponding support force at the lower part of the lumbar support frame 2, making the connection between the lumbar support frame 2 and the chair back body frame 1 more stable.

[0027] A limiting groove 7 is provided on the front side of the second crossbeam 5, and a first mounting hole is provided in the limiting groove 7. A protrusion 8 adapted to the limiting groove 7 is provided on the rear side of the upper part of the waist support frame 2. A second mounting hole is provided on the protrusion 8. The protrusion 8 is fitted into the limiting groove 7. The first mounting hole and the second mounting hole are opposite each other. Fixing screws are installed in the first mounting hole and the second mounting hole. At least two limiting grooves 7 and two protrusions 8 are provided. The limiting groove 7 limits the protrusion 8, thereby preventing the fixing screws from loosening due to misalignment of the first mounting hole and the second mounting hole.

[0028] The lower rear side of the lumbar support frame 2 is provided with a first slot 9, and the front side of the chair back body frame 1 is provided with a second slot 10 corresponding to the first slot 9. The two ends of the spring assembly 3 are respectively installed on the first slot 9 and the second slot 10. Specifically, a first cylinder is centrally located in the first slot 9, and a second cylinder is centrally located in the second slot 10. The spring assembly 3 includes a spring element 301, a spring sleeve 302, and a spring pin 303. The two ends of the spring element 301 are respectively sleeved on the first and second cylinders. The spring sleeve 302 is sleeved on the outside of the spring element 301. One end of the spring element 301 and the spring sleeve 302 is inserted into the first slot 9. At least one spring pin 303 is inserted into the first cylinder along the radial direction of the first slot 9, fixing one end of the spring element 301 and the spring sleeve 302 within the first slot 9. The other end of the spring element 301 and the spring sleeve 302 is inserted into the second slot 10. At least one spring pin 303 is inserted into the second cylinder along the radial direction of the second slot 10, fixing the other end of the spring element 301 and the spring sleeve 302 within the second slot 10. The spring sleeve 302 is made of a soft material. Preferably, at least two spring assemblies 3 are installed.

[0029] The chair back structure also includes an identification element 11, which is detachably mounted on the rear side of the chair back body frame 1 and covers the first mounting hole. Specifically, a groove for accommodating the identification element 11 is provided on the rear side of the second crossbeam portion 5, and a through hole is provided in the groove. The identification element 11 is snapped into the through hole. The identification element 11 is made of rubber, and an identification mark can be engraved on its outer side. It also covers the fixing screw in the first mounting hole for a decorative purpose.

[0030] When assembling the chair back frame 1 and the lumbar support frame 2, first install the protrusion 8 into the limiting groove 7, and install the spring 301 and spring sleeve 302 into the first slot 9 and the second slot 10 respectively. Then, install the fixing screws into the first mounting hole and the second mounting hole for fixing. Finally, use the spring pin 303 to fix the spring 301 and the spring sleeve 302. The assembly process of the chair back structure is simple and convenient to operate.

[0031] Example 2

[0032] refer to Figure 3 , Figure 4 As shown, Embodiment 2 provides another chair back structure, which is basically the same as Embodiment 1. The similarities will not be repeated. Only the differences will be introduced below.

[0033] The chair back structure also includes a headrest connecting block 12 for connecting the headrest component 14, so that the user can support their head when leaning back in the chair. The headrest connecting block 12 includes a connecting block body 121 and a detachably connected fixing plate 122. One end of the fixing plate 122 is fixed to the lower part of the connecting block body 121 with a through-hole screw. The connecting block body 121 and the fixing plate 122 are connected to form a fixing groove. The headrest connecting block 12 is snapped onto the first crossbeam 4 through the fixing groove. The connecting block body 121 is provided with a sliding groove 123 for connecting the headrest component 14.

[0034] Mounting part 6 is used to mount the backrest structure onto the seat 13. Grooves are provided at intervals on mounting part 6 to reduce the overall weight of the backrest structure.

[0035] The front side of the upper frame of the chair back body frame 1 and the front side of the lumbar support frame 2 are both covered with mesh fabric. The mesh fabric is made of nylon and fiberglass material, which can not only provide sufficient support, but also better breathability.

[0036] The technical features of the above embodiments can be combined in any way (as long as there is no contradiction in the combination of these technical features). For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described; these embodiments not explicitly written should also be considered to be within the scope of this specification.

Claims

1. A chair back structure, characterized in that, The chair back includes a backrest body frame, a lumbar support frame, and a spring assembly. The backrest body frame includes a first crossbeam, a second crossbeam, and a mounting portion integrally formed from top to bottom. The front side of the second crossbeam is detachably connected to the upper part of the lumbar support frame, and the lower part of the lumbar support frame is connected to both sides of the backrest body frame via the spring assembly.

2. The chair back structure according to claim 1, characterized in that, The front side of the second crossbeam is provided with a limiting groove, and a first mounting hole is provided in the limiting groove. The rear side of the upper part of the waist support frame is provided with a protrusion that matches the limiting groove. A second mounting hole is provided on the protrusion. The protrusion is assembled into the limiting groove. The first mounting hole and the second mounting hole are opposite to each other. Fixing screws are installed in the first mounting hole and the second mounting hole.

3. The chair back structure according to claim 2, characterized in that, A first slot is provided on the rear side of the lower part of the lumbar support frame, and a second slot corresponding to the first slot is provided on the backrest body frame. The two ends of the spring assembly are respectively installed on the first slot and the second slot.

4. The chair back structure according to claim 3, characterized in that, The spring assembly includes a spring element, a spring sleeve, and a spring pin. The spring sleeve is disposed on the outside of the spring element. One end of the spring element and the spring sleeve is fixed to the first slot by the spring pin, and the other end of the spring element and the spring sleeve is fixed to the second slot by the spring pin.

5. The chair back structure according to claim 2, characterized in that, The chair back structure also includes an identification element, which is detachably mounted on the rear side of the chair back body frame and covers the first mounting hole.

6. The chair back structure according to claim 1, characterized in that, The chair back structure also includes a headrest connecting block, which includes a connecting block body and a detachably connected fixing plate. The connecting block body and the fixing plate are connected to form a fixing groove. The headrest connecting block is snapped onto the first crossbeam through the fixing groove. A sliding groove is provided on the connecting block body for connecting the headrest component.

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