Backrest structure and office chair

Abstract

The utility model discloses a backrest structure and an office chair, the backrest structure comprises two backrest components, the two backrest components are sequentially arranged along the vertical direction, a first gap is arranged between the two backrest components, an elastic piece is connected between the two backrest components, and two ends of the elastic piece are arranged on the rear sides of the two backrest components in a one-to-one correspondence manner. When the office chair is used, a user sits on the office chair and can lean against the front side of the backrest, and when the user needs to lean backwards to stretch the body for relieving after sitting for a long time, the lower backrest connected with the chair frame of the office chair is kept fixed, and the upper backrest swings backwards relative to the lower backrest, so that the physiological lordosis of the spine of the waist of the user is temporarily increased; therefore, the centrum gap is slightly enlarged, and the pressure caused by long-time sitting or stooping is released; the arrangement of the elastic piece enables the upper backrest to have the trend of swinging forwards to restore so as to keep supporting the trunk of the user. The office chair comprises a chair frame, a cushion and the backrest structure.

Description

Technical Field

[0001] This utility model relates to the field of furniture, and in particular to a backrest structure and an office chair. Background Technology

[0002] To allow users to lean back and stretch their bodies after sitting for a long time, office chairs with adjustable backrests have been developed and manufactured. However, when adjusting the backrest, the entire backrest is adjusted, and the user's lower back remains arched when leaning back, which fails to achieve the purpose of stretching and relieving lower back pain, and there is still room for improvement. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a backrest structure and an office chair.

[0004] According to a first aspect embodiment of the present invention, a backrest structure includes two backrest components arranged sequentially in a vertical direction, with a first gap between the two backrest components. Each backrest component has a front back facing the user and a back back facing away from the user, with the front back facing the back back being the front. An elastic member is connected between the two backrest components, with both ends of the elastic member correspondingly disposed on the rear side of the two backrest components.

[0005] According to the first aspect of the present invention, the backrest structure has at least the following technical effects: When in use, the user can sit on the office chair and lean against the front of the backrest. When the user needs to lean back to stretch and relax after sitting for a long time, the lower backrest connected to the chair frame of the office chair remains fixed, while the upper backrest swings backward relative to the lower backrest, which temporarily increases the physiological lordosis of the user's lumbar spine, thereby slightly widening the intervertebral space and relieving the pressure caused by sitting for a long time or bending over; the elastic element makes the upper backrest tend to swing forward to restore its original shape, so as to maintain support for the user's torso.

[0006] According to some embodiments of this utility model, the number of elastic elements is two, and the two elastic elements are arranged at intervals.

[0007] According to some embodiments of the present invention, the backrest component has a vertically arranged support plate and a flexible pad disposed on the front side of the support plate.

[0008] According to some embodiments of the present invention, a connecting seat is connected between the elastic element and the backrest component, and the connecting seat has a first connecting portion in the shape of a sheet, the first connecting portion being fitted to the support plate.

[0009] According to some embodiments of this utility model, the elastic element is a spring.

[0010] According to some embodiments of the present invention, the connecting seat has a second connecting part, which is inserted into the end of the spring. The second connecting part is provided with an external thread, and the second connecting part is threadedly connected to the spring.

[0011] According to some embodiments of the present invention, the connector has a third connecting portion, which is connected between the first connecting portion and the second connecting portion. The third connecting portion is provided with a socket, which extends radially along the second connecting portion.

[0012] An office chair according to a second aspect of the present invention includes a chair frame, a seat cushion, and the aforementioned backrest structure. The seat cushion and the backrest structure are both disposed on the chair frame, and the seat cushion is located on the lower front side of the backrest structure.

[0013] The office chair according to the second aspect of the present invention has at least the following technical effects: by setting the above-mentioned backrest structure, when the user needs to lean back to stretch the body and relax after sitting for a long time, the lower backrest connected to the chair frame remains fixed, and the upper backrest swings backward relative to the lower backrest, so that the physiological lordosis of the user's lumbar spine temporarily increases, thereby slightly widening the intervertebral space and relieving the pressure caused by sitting for a long time or bending over.

[0014] According to some embodiments of the present invention, the outer side of the backrest structure is provided with a skin.

[0015] According to some embodiments of the present invention, the chair frame is provided with two armrests, and a crossbeam is provided on the rear side of the backrest structure. The crossbeam is located beside the first gap, and both ends of the crossbeam are respectively connected to the two armrests.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0018] Figure 1 This is a rear view schematic diagram of the backrest structure according to an embodiment of the present utility model;

[0019] Figure 2 yes Figure 1 An exploded view of the elastic element and connecting seat in the diagram;

[0020] Figure 3 This is a three-dimensional structural diagram of the office chair according to an embodiment of the present utility model;

[0021] In the attached image:

[0022] 100 - Backrest structure; 110 - Upper backrest; 120 - Lower backrest; 130 - First gap; 200 - Connecting seat; 210 - First connecting part; 220 - Second connecting part; 230 - Third connecting part; 231 - Insertion hole; 300 - Spring; 400 - Chair frame; 410 - Armrest; 420 - Crossbeam; 430 - Seat cushion. Detailed Implementation

[0023] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0024] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc., are understood to exclude the stated number, while "above," "below," "within," etc., are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0025] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0026] The following is for reference. Figures 1 to 3 This invention describes a backrest structure and an office chair according to embodiments of the present invention.

[0027] The backrest structure of the first aspect embodiment of this utility model, referring to... Figure 1The chair includes two backrest components arranged vertically in sequence. These components are referred to as the upper backrest 110 and the lower backrest 120, respectively. The upper backrest 110 is positioned above the lower backrest 120. A first gap 130 is provided between the two backrest components, allowing the upper backrest 110 to move relative to the lower backrest 120. Each backrest component has a front facing the user and a back facing away from the user, with the front facing the back being the forward position. The bottom of the lower backrest 120 is used to connect to the office chair. The vertical dimension of the lower backrest 120 on the rear side of the seat cushion 430 is adapted to the position of the human waist, so that when the user sits on the seat cushion 430, the first gap 130 is positioned at the user's waist. An elastic element is connected between the two backrest components. The elastic element is located behind the first gap 130 and extends vertically across the first gap 130. The two ends of the elastic element are positioned on the rear side of the two backrest components, so that the top of the elastic element can abut against the upper backrest 110 from back to front and apply a forward force to the upper backrest 110.

[0028] When in use, the user can sit with their back against the front of the office chair. When the user needs to lean back to stretch and relax after sitting for a long time, the lower backrest 120 connected to the chair frame 400 of the office chair remains fixed, while the upper backrest 110 swings backward relative to the lower backrest 120, which temporarily increases the physiological lordosis of the user's lumbar spine, thereby slightly widening the intervertebral space and relieving the pressure caused by sitting for a long time or bending over. The elastic element makes the upper backrest 110 tend to swing forward to restore its original position, so as to maintain support for the user's torso.

[0029] In some embodiments of this invention, there are two elastic elements, spaced apart. The two elastic elements are spaced laterally, thus making the connection between the two backrest components more stable.

[0030] In some embodiments of this invention, the backrest component has a vertically arranged support plate and a flexible pad disposed on the front side of the support plate. The support plate may be a wooden board, and the flexible pad may be a component made of leather wrapped with sponge. The flexible pad is used to conform to the user's back to reduce local pressure and adapt to dynamic postures. Combining the soft flexible pad with the hard support plate ensures both comfort and maintains a neutral spinal position, meeting the user's needs.

[0031] In some embodiments of this utility model, a connecting seat 200 is provided between the elastic element and the backrest component. The connecting seat 200 has a sheet-like first connecting portion 210, which is fitted to the support plate. The connecting seat 200 can be a metal component. By providing the sheet-like first connecting portion 210, the force exerted by the elastic element on the support plate is distributed over a larger area, reducing the pressure between the connecting seat 200 and the support plate, and preventing damage to the support plate due to excessive pressure. The connecting seat 200 and the support plate can be connected by bolts.

[0032] In some embodiments of this utility model, the elastic element is a spring 300. The spring 300 is arranged vertically, so that the upper backrest 110 can swing with a larger range, making it suitable for different users and with a wider range of applications.

[0033] In some embodiments of this utility model, reference is made to Figure 2 The connecting seat 200 has a second connecting portion 220, which is inserted into the end of the spring 300. The second connecting portion 220 is provided with external threads and is threadedly connected to the spring 300. Through the structure of insertion and threaded connection, the connecting seat 200 and the elastic element can transmit a larger force, and the structure is more stable.

[0034] In some embodiments of this utility model, the connector 200 has a third connecting portion 230, which is connected between the first connecting portion 210 and the second connecting portion 220. The third connecting portion 230 is provided with a socket 231, which extends radially along the second connecting portion 220. It is understood that, to prevent loosening of the connection between the spring 300 and the second connecting portion 220, the inner side of the spring 300 is press-fitted with the second connecting portion 220, which also makes it difficult to screw the second connecting portion 220 into the spring 300. In this embodiment, by providing the socket 231, a screwdriver or other rod-shaped object can be inserted into the socket 231 during assembly, and the second connecting portion 220 and the third connecting portion 230 can be rotated by turning the screwdriver to screw the second connecting portion 220 into the spring 300, facilitating assembly. Both the second connecting part 220 and the third connecting part 230 are cylindrical. The second connecting part 220 and the third connecting part 230 are coaxial. The diameter of the third connecting part 230 is larger than the diameter of the second connecting part 220. The third connecting part 230 is located on the outside of the spring 300. The third connecting part 230 can be fixedly connected to the first connecting part 210 by welding or other suitable means. The second connecting part 220 and the third connecting part 230 can be an integral component.

[0035] The office chair of the second aspect of this utility model includes a chair frame 400, a seat cushion 430, and the aforementioned backrest structure 100. Both the seat cushion 430 and the backrest structure 100 are disposed on the chair frame 400, with the seat cushion 430 located on the lower front side of the backrest structure 100. The seat cushion 430 is arranged laterally, and the bottom of the lower backrest 120 is disposed on the upper rear side of the seat cushion 430, allowing the user to rest reliably on the backrest structure 100 when sitting on the seat cushion 430. By configuring the aforementioned backrest structure, when the user needs to lean back to stretch and relax after prolonged sitting, the lower backrest 120 connected to the chair frame 400 remains fixed, while the upper backrest 110 swings backward relative to the lower backrest 120, temporarily increasing the physiological lordosis of the user's lumbar spine, thereby slightly widening the intervertebral space and relieving pressure from prolonged sitting or bending over.

[0036] In some embodiments of this utility model, a skin is provided on the outer side of the backrest structure. The skin wraps around the elastic element and the outer side of the two backrest components, and a sponge or other filling material is provided between the skin and the backrest structure to make the surface of the office chair smooth, while avoiding the problem of the backrest structure being easily damaged by friction and scratches due to direct exposure.

[0037] In some embodiments of this utility model, reference is made to Figure 3 The chair frame 400 is equipped with two armrests 410, and a crossbeam 420 is provided on the rear side of the backrest structure 100. The crossbeam 420 is located beside the first gap 130, and its two ends are connected to the two armrests 410 respectively. The crossbeam 420 abuts against the middle of the spring 300 from back to front. In this way, when the upper backrest 110 is tilted back, the two ends of the spring 300 abut against the support plate from back to front through the corresponding connecting seats 200. The structure is reasonable, and the connection between the spring 300 and the two support plates is stable and not easily damaged. In particular, when the outer side of the backrest structure is covered with a skin, the crossbeam 420 abuts against the spring 300 through the skin.

[0038] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A backrest structure, characterized in that: It includes two backrest components, which are arranged vertically in sequence and a first gap is provided between them. Each backrest component has a front back facing the user and a back back facing away from the user, with the front back facing the back back being the orientation of the front back relative to the back back. An elastic element is connected between the two backrest components, and the two ends of the elastic element are respectively disposed on the rear side of the two backrest components.

2. The backrest structure according to claim 1, characterized in that: The number of elastic elements is two, and the two elastic elements are arranged at an interval.

3. The backrest structure according to claim 1, characterized in that: The backrest component has a vertically arranged support plate and a flexible pad located on the front side of the support plate.

4. The backrest structure according to claim 3, characterized in that: A connecting seat is connected between the elastic element and the backrest component. The connecting seat has a first connecting portion in the shape of a sheet, which is in contact with the support plate.

5. The backrest structure according to claim 4, characterized in that: The elastic element is a spring.

6. The backrest structure according to claim 5, characterized in that: The connector has a second connecting part, which is inserted into the end of the spring. The second connecting part is provided with an external thread and is threadedly connected to the spring.

7. The backrest structure according to claim 6, characterized in that: The connector has a third connecting portion, which connects the first connecting portion and the second connecting portion. The third connecting portion is provided with a socket, which extends radially along the second connecting portion.

8. An office chair, characterized in that: The chair includes a chair frame, a seat cushion, and a backrest structure as described in any one of claims 1 to 7, wherein the seat cushion and the backrest structure are both disposed on the chair frame, and the seat cushion is located on the lower front side of the backrest structure.

9. The office chair according to claim 8, characterized in that: The backrest structure is covered with a skin on the outside.

10. The office chair according to claim 8, characterized in that: The chair frame is provided with two armrests, and a crossbeam is provided on the rear side of the backrest structure. The crossbeam is located beside the first gap, and both ends of the crossbeam are connected to the two armrests respectively.

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