Seat with backrest

Abstract

The utility model relates to a chair with a backrest, which comprises a chair back component, a chair back component and a chair back component, the chair back component comprises a pair of supporting longitudinal beams and at least one fixed cross beam, and the two ends of the fixed cross beam are respectively connected with the supporting longitudinal beams; the backrest assembly comprises a movable cross beam and a back cushion part, and the back cushion part is arranged on the movable cross beam in a penetrating mode and can rotate around the movable cross beam or be fixed; the two ends of the movable cross beam are connected to the supporting longitudinal beams respectively, and the movable cross beam can move or be fixed in the axial direction of the supporting longitudinal beams. The seat with the backrest, provided by the utility model, is provided with the backrest with a special structure, the main body of the backrest component consists of the supporting longitudinal beams, and the backrest component arranged on the supporting longitudinal beams can move, so that the position of the back cushion part in the backrest component can be adaptively adjusted, and the back cushion part can rotate, so that the back cushion part can be conveniently adjusted. The waist of the user can be adaptively propped according to the leaning posture, so that the body of the user can be better supported, and the comfort is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of household appliances technology, and in particular to a chair with a backrest. Background Technology

[0002] Chairs are common furniture in people's daily lives, used in many scenarios, including offices and conference rooms, and are usually equipped with backrests. Chairs with backrests allow users to lean back comfortably and relax. However, while such chairs are comfortable for short periods, prolonged sitting without lumbar support can easily lead to fatigue.

[0003] To address this, people add cushions or lumbar supports to their seats, or place the lumbar support directly on the backrest. However, the placement of these lumbar supports remains fixed, and they are not suitable for users of different body types, thus failing to improve comfort during prolonged sitting. Utility Model Content

[0004] In view of this, in order to solve at least one of the problems mentioned above, the present invention provides a seat with a backrest.

[0005] The chair with a backrest provided by this utility model includes:

[0006] The chair back assembly includes a pair of supporting longitudinal beams and at least one fixed crossbeam, with both ends of the fixed crossbeam connected to the supporting longitudinal beams respectively;

[0007] The backrest assembly includes a movable crossbeam and a cushion portion, the cushion portion being mounted on the movable crossbeam and rotatable or fixed around the movable crossbeam; both ends of the movable crossbeam are respectively connected to the supporting longitudinal beam and can move or be fixed along the axial direction of the supporting longitudinal beam.

[0008] The cushion part includes a cushion and a retractable bolt. The cushion part is provided with at least two threaded through holes. The retractable bolt is threaded into the threaded through holes and can abut against the movable crossbeam.

[0009] In one embodiment, the cushion has an arcuate surface on at least one side in the radial direction.

[0010] In one embodiment, the cushion is cylindrical and has a first connecting through hole, the central axis of the first connecting through hole being spaced apart from the central axis of the cushion.

[0011] In one embodiment, a plurality of positioning grooves are evenly provided on the peripheral side of the movable crossbeam, and the top end of the retractable bolt can abut against the positioning groove.

[0012] In one embodiment, the cushion portion is provided with two first threaded through holes and one second threaded through hole, the inner diameter of the second threaded through hole being smaller than the inner diameter of the first threaded through hole; the cushion portion also includes a positioning pin, the telescopic bolt abutting against the movable crossbeam through the first threaded through hole, and the top end of the positioning pin matching the positioning groove.

[0013] In one embodiment, the movable crossbeam includes a movable beam and two connecting seats. The connecting seats are provided with a second connecting through hole and a connecting countersunk hole. The axial direction of the second connecting through hole is perpendicular to the axial direction of the connecting countersunk hole. The connecting seats pass through the second connecting through hole onto the supporting longitudinal beam, and the end of the movable beam is connected to the connecting countersunk hole.

[0014] In one embodiment, a positioning screw is provided on the sidewall of the connecting through hole, and the positioning screw can press against the supporting longitudinal beam.

[0015] In one embodiment, the sidewall of the connecting countersunk hole is provided with a dovetail groove extending inward from the hole opening, and at least one end of the movable beam is provided with a corresponding dovetail protrusion.

[0016] In one embodiment, the supporting longitudinal beam and the fixed crossbeam connected to the top of the supporting longitudinal beam are integrally bent; the supporting longitudinal beam is a hollow steel pipe.

[0017] In one embodiment, the backrest assembly includes two sets of backrest assemblies, with the movable crossbeams of the two sets of backrest assemblies arranged parallel to each other on the supporting longitudinal beam.

[0018] The technical solutions provided in the embodiments of this utility model bring the following beneficial technical effects:

[0019] The chair with a backrest provided by this utility model has a backrest with a special structure. The main body of the backrest assembly is composed of supporting longitudinal beams. The backrest assembly installed on the supporting longitudinal beams can move, thereby adaptively adjusting the position of the backrest cushion. The backrest cushion itself can also rotate, so as to adaptively support the user's waist according to the leaning posture, better support the user's body, and effectively improve comfort.

[0020] Additional aspects and advantages of this application will be set forth in the following sections and will be understood in detail from the following description or by means of specific implementation of the present invention. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a first-view structural diagram of a seat with a backrest in one embodiment of the present invention;

[0023] Figure 2 This is a second-view structural diagram of a seat with a backrest in one embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of the movable crossbeam in one embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the cushion structure in one embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the backrest assembly in another embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of the cushion structure in another embodiment of the present invention;

[0028] Figure 7 This is a schematic diagram of the movable crossbeam in another embodiment of the present invention;

[0029] Figure 8 This is a schematic diagram of the retractable bolt in one embodiment of the present invention;

[0030] Figure 9 This is a schematic diagram of the positioning pin in one embodiment of the present invention;

[0031] Figure 10 This is a schematic diagram of the connecting seat in one embodiment of the present invention.

[0032] Explanation of reference numerals in the attached figures:

[0033] 100 - Chair back assembly, 200 - Backrest assembly, 300 - Seat cushion, 400 - Seat support;

[0034] 110 - Supporting longitudinal beam, 120 - Fixed crossbeam;

[0035] 210 - Moving crossbeam, 220 - Cushion section;

[0036] 211-Positioning groove, 212-Moving beam, 213-Connecting seat, 213a-Second connecting through hole, 213b-Connecting countersunk hole, 214-Positioning screw;

[0037] 221-Cushion, 222-Extendable bolt, 223-Positioning pin, 221a-First connecting through hole, 220a-First threaded through hole, 220b-Second threaded through hole. Detailed Implementation

[0038] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0039] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0040] 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 this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0041] The chair with a backrest provided by this utility model, such as Figure 1 and Figure 2 As shown, it includes a backrest assembly 100 and a backrest assembly 200. The backrest assembly 200 is mounted on the backrest assembly 100. Of course, since it is a seat, it must include a seat cushion 300 and a seat support 400. Since this is not the focus of this application, it is not described in detail. However, this does not mean that the technical solution of the seat with a backrest provided by this utility model is incomplete or that the disclosure is insufficient.

[0042] Specifically, such as Figure 1 and Figure 2As shown, the chair back assembly 100 includes a pair of supporting longitudinal beams 110 and at least one fixed crossbeam 120, with both ends of the fixed crossbeam 120 connected to the supporting longitudinal beams 110. The fixed crossbeam 120 can form the entire chair back by welding it to the supporting longitudinal beams 110, or it can be formed by using detachable fasteners. In some more specific implementations, the supporting longitudinal beams 110 and the fixed crossbeam 120 connected to the top of the supporting longitudinal beams 110 are integrally bent. The supporting longitudinal beams 110 are hollow steel tubes, and the fixed crossbeam 120 and the supporting longitudinal beams 110 use the same hollow steel tube. Furthermore, there can be multiple fixed crossbeams 120 to support the user's back. The specific shape of the fixed crossbeam 120 can vary depending on the designer's needs. The supporting longitudinal beams 110 can be elongated cylindrical or other types; as a structural component, they need to meet the performance requirements of the chair.

[0043] like Figure 2 and Figure 5 As shown, the backrest assembly 200 includes a movable crossbeam 210 and a cushion portion 220. The cushion portion 220 passes through the movable crossbeam 210 and can rotate or be fixed around the movable crossbeam 210. Both ends of the movable crossbeam 210 are connected to the supporting longitudinal beam 110 and can move or be fixed along the axial direction of the supporting longitudinal beam 110. The movable crossbeam 210 in the backrest assembly 200 can move up and down along the axial direction of the supporting longitudinal beam 110, while the cushion portion 220 can rotate around the movable crossbeam 210. The cushion portion 220 can be configured with a multi-faceted shape, with some sides protruding more and others less, to better suit different users. When a user sits on the chair and leans against the backrest, the position of the movable crossbeam 210 on the supporting longitudinal beam 110 can be adjusted as needed. The cushion portion 220 can also adjust its rotation angle in real time according to the user's posture, maintaining a close fit between the cushion portion 220 and the backrest.

[0044] like Figure 2 and Figure 5As shown, the cushion portion 220 includes a cushion 221 and a retractable bolt 222. The cushion portion 220 has at least two threaded through holes, and the retractable bolt 222 is threaded into these holes and can abut against the movable crossbeam 210. Specifically, the cushion portion 220 includes the cushion 221 and the retractable bolt 222, which secures or releases the cushion 221 from the movable crossbeam 210. The outer end of the retractable bolt 222 has a handle for user operation. In this embodiment, the movable crossbeam 210 is non-rotatable, while the cushion 221 on the movable crossbeam 210 is rotatable. When the retractable bolt 222 is pressed against the movable crossbeam 210 with sufficient pressure, the cushion 221 is fixed to the movable crossbeam 210. In other embodiments, the movable crossbeam 210 and the cushion 221 can be fixedly connected to each other. The movable crossbeam 210 is connected to the supporting longitudinal beam 110 through a damping connector. The movable crossbeam 210 can rotate on the damping connector and rotate with a certain damping to improve the stability and reliability of the cushion 220.

[0045] The chair with a backrest provided by this utility model has a backrest with a special structure. The main body of the backrest assembly 100 is composed of a supporting longitudinal beam 110. The backrest assembly 200 installed on the supporting longitudinal beam 110 can move, thereby adaptively adjusting the position of the cushion part 220 in the backrest assembly 200. The cushion part 220 itself can also rotate, so that it can adaptively support the user's waist according to the leaning posture, better support the user's body, and effectively improve comfort.

[0046] To allow the cushion section 220 to be designed with multiple facets, some sides protrude more while others protrude less, in order to better accommodate different users. Figure 4 As shown, in some specific implementations, the cushion 221 has an arc surface on at least one side in the radial direction. The cushion 221 is designed in the shape of a common lumbar pillow, mostly in the form of a cuboid with one side having a certain arc surface to adapt to the curvature of the human spine.

[0047] Of course, in conjunction with the foregoing embodiments, in one specific implementation, such as Figure 5 and Figure 6As shown, the cushion 221 is cylindrical, and a first connecting through hole 221a is provided on the cushion 221. The central axis of the first connecting through hole 221a is spaced apart from the central axis of the cushion 221. The cushion 221 is a cylinder as a whole, but the cushion 221 is not coaxial with the moving crossbeam 210. That is, the first connecting through hole 221a on the cushion 221 actually makes the cushion 221 an eccentric cylindrical structure on the moving crossbeam 210. When it is necessary to adapt to different users, the cushion 221 can be rotated around the central axis of the moving crossbeam 210 to adjust the degree of convexity of the eccentric cushion 221 towards the human back. The eccentric cylindrical shape of the cushion 221 is simple in structure, but can fully meet the design and functional requirements of this utility model. The cushion part 220 generally includes a cushion 221 made of soft covering material on the surface and an inner core (not shown in the figure) made of hard material. The connecting structure is set on the inner core.

[0048] Optionally, to ensure the cushion 221 is securely fixed and that the retractable bolt 222 is not unable to hold it in place on the smooth moving crossbeam 210, in one specific implementation of this utility model, such as... Figure 5 and Figure 7 As shown, a number of positioning grooves 211 are evenly provided on the peripheral side of the movable crossbeam 210, and the top of the telescopic bolt 222 can abut in the positioning groove 211.

[0049] In conjunction with the aforementioned implementation methods, in a preferred embodiment of this utility model, such as Figures 8-10 As shown, the cushion portion 220 is provided with two first threaded through holes 220a and one second threaded through hole 220b, the inner diameter of the second threaded through hole 220b being smaller than the inner diameter of the first threaded through hole 220a; as Figure 8 and Figure 9 As shown, the cushion portion 220 also includes a positioning pin 223. The telescopic bolt 222 abuts against the movable crossbeam 210 through the first threaded through hole 220a. The top end of the positioning pin 223 matches the positioning groove 211, and can be chamfered or rounded, such as... Figure 8 and Figure 9As shown, the tips of the locating pin 223 and the telescopic bolt 222 are sharpened to better engage with the locating groove 211. The use of two threaded through-hole designs allows for more precise functionality. The first threaded through-hole houses the telescopic bolt 222, which roughly abuts against the moving crossbeam 210. The smaller locating pin 223, located in the second threaded through-hole 220b, can be used to fix the cushion to the moving crossbeam. This allows for more locating grooves 211 on the outer circumference of the moving crossbeam 210, enabling the cushion 220 to rotate and be positioned at more locations, thus allowing for more flexible position adjustment. The telescopic bolt 222, locating pin 223, and locating screw 214 are just one possible implementation method; the use of other existing technologies that facilitate adjustment of tightness or release of fixation is not excluded.

[0050] To achieve the connection and relative movement between the movable crossbeam 210 and the supporting longitudinal beam 110, in another embodiment of this utility model, such as... Figure 3 and Figure 10 As shown, the movable crossbeam 210 includes a movable beam 212 and two connecting seats 213. Each connecting seat 213 has a second connecting through hole 213a and a connecting countersunk hole 213b. The axial direction of the second connecting through hole 213a is perpendicular to the axial direction of the connecting countersunk hole 213b. The connecting seat 213 passes through the second connecting through hole 213a onto the supporting longitudinal beam 110. The end of the movable beam 212 is connected to the connecting countersunk hole 213b. Both ends of the movable beam 212 are connected to a pair of parallel supporting longitudinal beams 110 via the connecting seats 213. The connecting seats 213 can move relative to the supporting longitudinal beams 110, thereby ensuring that the entire movable crossbeam 210 moves on the supporting longitudinal beams 110. Specifically, in one implementation, a positioning screw 214 is provided on the side wall of the connecting through hole, which can press against the supporting longitudinal beam 110. Similarly, the movable or fixed position of the connecting seat 213 can be adjusted by adjusting the tightness of the positioning screw 214. Figure 10 As shown, if the cushion 221 is set to rotate around the movable beam, then the movable beam 212 and the connecting seat 213 are relatively fixed and cannot rotate. Then, a dovetail groove extending inward from the opening of the connecting countersunk hole 213b can be provided on the side wall of the connecting countersunk hole. At least one of the two ends of the movable beam 212 is correspondingly provided with a dovetail protrusion. The two match each other, so that the connecting seat 213 and the movable beam 212 are relatively fixed.

[0051] Optionally, in another embodiment of this utility model, to further improve the comfort of the seat, the seat with backrest provided by this utility model includes two sets of backrest components 200, and the movable crossbeams 210 in the two sets of backrest components 200 are arranged parallel to each other on the supporting longitudinal beam 110. The two sets of backrest components 200 are arranged at different positions on the seat back to support the human lower back at different positions, thereby providing the user with a more substantial and flexible sense of support.

[0052] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0053] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A seat with a backrest, characterized in that, include: The chair back assembly includes a pair of supporting longitudinal beams and at least one fixed crossbeam, with both ends of the fixed crossbeam connected to the supporting longitudinal beams respectively; The backrest assembly includes a movable crossbeam and a cushion portion, the cushion portion being mounted on the movable crossbeam and rotatable or fixed around the movable crossbeam; both ends of the movable crossbeam are respectively connected to the supporting longitudinal beam and can move or be fixed along the axial direction of the supporting longitudinal beam. The cushion part includes a cushion and a retractable bolt. The cushion part is provided with at least two threaded through holes. The retractable bolt is threaded into the threaded through holes and can abut against the movable crossbeam.

2. The seat with a backrest according to claim 1, characterized in that, The cushion has an arc surface on at least one side in the radial direction.

3. The seat with a backrest according to claim 1, characterized in that, The cushion is cylindrical and has a first connecting through hole. The central axis of the first connecting through hole is spaced apart from the central axis of the cushion.

4. The seat with a backrest according to claim 1, characterized in that, The movable crossbeam has several positioning grooves evenly arranged on its peripheral side, and the top end of the telescopic bolt can abut against the positioning groove.

5. The seat with a backrest according to claim 4, characterized in that, The cushion portion is provided with two first threaded through holes and one second threaded through hole, the inner diameter of the second threaded through hole being smaller than the inner diameter of the first threaded through hole; the cushion portion also includes a positioning pin, the telescopic bolt abutting against the movable crossbeam through the first threaded through hole, and the top end of the positioning pin matching the positioning groove.

6. The seat with a backrest according to claim 1, characterized in that, The movable crossbeam includes a movable beam and two connecting seats. The connecting seats are provided with a second connecting through hole and a connecting countersunk hole. The axis of the second connecting through hole is perpendicular to the axis of the connecting countersunk hole. The connecting seats pass through the second connecting through hole onto the supporting longitudinal beam. The end of the movable beam is connected to the connecting countersunk hole.

7. The seat with a backrest according to claim 6, characterized in that, The sidewall of the connecting through hole is provided with a positioning screw, which can press against the supporting longitudinal beam.

8. The seat with a backrest according to claim 6, characterized in that, The sidewall of the connecting countersunk hole is provided with a dovetail groove extending inward from the hole opening, and at least one end of the two ends of the movable beam is provided with a corresponding dovetail protrusion.

9. The seat with a backrest according to claim 1, characterized in that, The supporting longitudinal beam and the fixed crossbeam connected to the top of the supporting longitudinal beam are integrally bent and formed; the supporting longitudinal beam is a hollow steel pipe.

10. The seat with a backrest according to claim 1, characterized in that, It includes two sets of backrest assemblies, and the movable crossbeams in the two sets of backrest assemblies are arranged parallel to each other on the supporting longitudinal beam.

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