Seat back and seat

Abstract

This invention discloses a chair back and a chair, comprising: a back support body, which is a frame structure, including an upper back frame at the top and a lower back frame at the bottom; the upper back frame includes back side rods located on the left and right sides respectively, and the lower back frame includes a mounting part at the bottom and support rods extending upward from the mounting part to the left and right sides respectively; the upper back frame and the lower back frame are an integral structure, and the support rods are inclined downward and backward from the bottom of the back side rods; a flexible side connecting rod is configured to be detachably connected to the back side rods; a tongue is provided on one of the back side rods or the flexible side connecting rods, and a corresponding slot is provided on the other of the upper back side rods or the connecting side rods; the flexible side connecting rod and the back side rods are inserted into each other and fixed together by screws, the screws being configured to pass through from the front side of the chair back assembly to the rear. The flexible side connecting rod and the back side rods are detachably connected, which facilitates disassembly and packaging, saves transportation costs, and is quick and convenient to connect.

Description

Technical Field

[0001] This invention relates to the field of seating, and particularly to a chair back and a seat. Background Technology

[0002] Office chairs, as an indispensable part of office furniture, are popular among consumers due to their practicality. Modern office environments emphasize comfort; users prefer chairs that can adjust to changes in posture to ensure comfort and promote health. Currently, most office chairs on the market offer adjustable seats and backrests, allowing them to move forward and backward to accommodate dynamic postures and improve comfort. However, this design often features a backrest connected to the rear of the base, with the seat attached to the top. This results in independent movement between the backrest and seat, causing a lumbar slippage when the chair reclines, leading to discomfort and a loss of lumbar support.

[0003] This leads to the proposal of installing an elastic linkage between the chair back and seat, enabling the back and seat to move in tandem during tilting motion, thus providing consistent lumbar support to the user when the seat is reclined. For example, invention patent CN201680027927.1 proposes a mechanical structure assembly that includes at least one additional spring element in addition to at least one leaf spring. The elastic restoring force of the at least one additional spring element and the elastic restoring force of the leaf spring utilize the total restoring force to support the seat shell. Alternatively, the mechanical structure assembly includes at least two leaf springs and at least two support members, each support member being associated with one of the leaf springs. At least two of the support members are movable under the leaf springs by an adjustment mechanism and can move along different sections of their travel track. The backrest of the chair is connected to the base at the back, and the lower end of the backrest extends and connects to the rear end of the seat. Although the backrest and seat can move in tandem during tilting, the chair back and seat are a single unit, requiring the entire backrest to be transported, resulting in a large packaging volume. This significantly increases packaging and transportation costs, especially over long distances. Therefore, it is necessary to further optimize the backrest structure to reduce packaging volume and save on transportation costs. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a seat backrest with an elastic side connecting rod at the bottom of the backrest side rod for connecting to the seat assembly. The elastic side connecting rod and the backrest side rod are detachably connected. This allows the back support body and the elastic side connecting rod to be packaged and transported separately, reducing packaging volume and saving transportation costs. During assembly and use, the elastic side connecting rod is simply inserted into the backrest side rod and connected with screws, making the connection convenient and quick, and easy for users to install themselves.

[0005] A seat is then provided in which the mounting part at the bottom of the lower back frame is connected to the rear end of the base; the elastic side link extends downward and forward from the bottom of the back side bar to connect with the rear end of the seat side bar; so that the seat back and seat assembly form a tilt linkage to avoid the "back slip" phenomenon.

[0006] The technical solution of this invention is implemented as follows:

[0007] A seat back includes: a back support body, which is a frame structure, comprising an upper back frame at the top and a lower back frame at the bottom; the upper back frame includes back side rods located on the left and right sides respectively, and the lower back frame includes a mounting part at the bottom and support rods extending upward from the mounting part to the left and right sides respectively; the upper back frame and the lower back frame are an integral structure, and the support rods are inclined downward and backward from the bottom of the back side rods; a flexible side connecting rod is configured to be detachably connected to the back side rods; a tongue is provided on one of the back side rods or the flexible side connecting rods, and a corresponding slot is provided on the other of the upper back side rods or the connecting side rods; the flexible side connecting rod and the back side rods are inserted into each other vertically and fixedly connected by screws, the screws being configured to pass through from the front side of the seat back to the rear.

[0008] Preferably, the front end of the seat back is also provided with a back support mesh, which covers the front end surfaces of the back side rod and the elastic side connecting rod. The screws are inserted from the front side of the seat back to the rear, so that when the back support body is covered with mesh, the back support mesh can just hide the screws, improving the appearance.

[0009] Preferably, the tongue is disposed on the elastic side connecting rod, and the slot is disposed at the bottom of the back side rod.

[0010] Preferably, the tongue has a connecting hole, and a mounting hole that penetrates the slot is provided at a corresponding position on the front end face of the backrest rod; the screw passes from the front side of the seat back to the mounting hole and is connected in the connecting hole. The screw effectively locks the tongue in the slot.

[0011] Preferably, the upper end of the elastic side link is provided with an upwardly protruding insertion root, and the tongue projects upward from the insertion root; the slot is correspondingly arranged at the bottom of the back rod, and an insertion groove for inserting the insertion root is formed by expanding the opening position at the bottom of the slot; the elastic side link and the back rod are inserted up and down so that the tongue is inserted into the slot, and the insertion root is embedded in the insertion groove. Thus, after insertion, when the elastic side link is stressed, the stress is mainly concentrated at the insertion root. The insertion root is thicker than the tongue, making the connection strong; while the tongue is mainly responsible for positioning and connecting the screw to disperse the stress.

[0012] Preferably, the elastic side link and the back rod are connected by a single screw. Only one screw connection is required, which is convenient for connection.

[0013] Preferably, the elastic side link has an "L" - shaped structure and extends downward and forward from the bottom of the back rod. It is convenient to connect with the seat.

[0014] Preferably, the included angle between the support rod and the back rod is between 135° and 165°. The support rod and the back rod are in a "bent" shape, enabling the elastic side link to be inserted at the bottom of the back rod, and the three do not interfere with each other.

[0015] A chair includes a base, a seat assembly, and the above - mentioned seat back; the installation part at the bottom of the lower back frame is connected to the rear end of the base; the seat assembly includes seat side rods located on the left and right sides respectively, and the elastic side link extends downward and forward from the bottom of the back rod to be connected to the rear end of the seat side rod.

[0016] The design starting point, concept, and beneficial effects of the present invention adopting the above - mentioned technical solutions are as follows:

[0017] First of all, for the seat back and the chair of the present invention, an elastic side link for connecting the seat assembly is provided at the bottom of the back rod. The elastic side link is connected to the side link of the seat assembly, enabling the seat back and the seat assembly to be linked when tilting, so that the seat back can always provide support for the user's waist and avoid "waist slipping"; and the elastic side link and the back rod are detachably connected; thus, during packaging and transportation, the back support main body and the elastic side link can be separately packed and transported, reducing the packaging volume and saving transportation costs. During assembly and use, directly insert and connect the elastic side link and the back rod with a screw, which is convenient and fast, and convenient for users to install by themselves.

[0018] Furthermore, the screw penetrates into the back rod from the front side to the rear side of the seat back; and a back support mesh is also provided at the front end of the seat back, and the back support mesh covers the front end faces of the back rod and the elastic side link; thus, the back support mesh can just hide the screw, with a clever design and beautiful appearance.

[0019] Furthermore, the upper end of the elastic side connecting rod is provided with a plug-in root, from which the plug tongue extends upward; the slot is correspondingly located at the bottom of the back side rod, and the bottom opening of the slot is expanded outward to form a groove for insertion with the plug-in root; the elastic side connecting rod and the back side rod are inserted vertically to allow the plug tongue to be inserted into the slot, and the plug-in root to be embedded in the groove. A screw passes through the front end of the back side rod and connects to the plug tongue; thus, the plug tongue and slot serve to position the installation and connect the screw; the plug-in root is the main load-bearing structure; thereby distributing the structural stress and improving the stability of the insertion. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the seat back in an embodiment of the present invention;

[0021] Figure 2 This is a side view of the seat back in an embodiment of the present invention;

[0022] Figure 3 This is a diagram showing the connection structure between the back side rod and the elastic side connecting rod in an embodiment of the present invention;

[0023] Figure 4 for Figure 3 A magnified view of part A in the middle;

[0024] Figure 5 This is a three-dimensional structural diagram of the seat back connected to the back support mesh in an embodiment of the present invention;

[0025] Figure 6 This is a three-dimensional structural diagram of the elastic side connecting rod in an embodiment of the present invention;

[0026] Figure 7 This is a three-dimensional structural diagram of the bottom of the back side rod in an embodiment of the present invention;

[0027] Figure 8 This is a three-dimensional structural diagram of the back of the chair in an embodiment of the present invention;

[0028] Figure 9 This is a side view of the chair in an embodiment of the present invention.

[0029] The attached figures are labeled as follows: back support body A; upper back frame 1; back side rod 1a; lower back frame 2; mounting part 2a; support rod 2b; elastic side connecting rod 3; tongue 4; slot 5; screw 6; insertion root 7; groove 8; connecting hole 9; mounting hole 10; back support mesh 11; base 12; seat assembly 13; seat side rod 13a. Detailed Implementation

[0030] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0031] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0032] In the description of this invention, the term "at least one" means one or more, unless otherwise expressly defined. The terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] The specific embodiments of the present invention are as follows:

[0034] like Figure 1-7 As shown, the present invention first provides a seat back, including a back support body A, which is a frame structure. The back support body A includes an upper back frame 1 located at the top and a lower back frame 2 located at the bottom. The upper back frame 1 includes back side rods 1a located on the left and right sides respectively. The lower back frame 2 includes a mounting part 2a at the bottom and support rods 2b extending upward from the mounting part 2a to the left and right sides respectively. The upper end of the support rod 2b is connected to the bottom of the back side rod 1a, and the upper back frame 1 and the lower back frame 2 are an integral structure. The support rod 2b is inclined downward and backward from the bottom of the back side rod 1a. At the bottom of each backrest rod 1a, a detachable elastic side connecting rod 3 is provided, and the elastic side connecting rod 3 and the backrest rod 1a are connected by an upper and lower insertion fit. A tongue 4 is provided at the upper end of the elastic side connecting rod 3, and a corresponding slot 5 is provided at the bottom of the backrest rod 1a. The elastic side connecting rod 3 and the backrest rod 1a are connected by an upper and lower insertion fit, and are fixed together by a screw 6. The screw 6 is configured to pass from the front side of the backrest rod 1a to the rear side, through the backrest rod 1a and the tongue 4. Specifically, this chair back is used in a reclining chair. The elastic side connecting rod 3 is used to connect the chair seat assembly, so that the chair back and the seat assembly move in tandem; it can stably support the human waist and prevent back slippage. Furthermore, the elastic side connecting rod 3 and the backrest rod 1a are detachably connected, allowing the back support body A and the elastic side connecting rod 3 to be packaged and transported separately, reducing packaging volume and saving transportation costs. When assembling and using, simply insert the elastic side connecting rod 3 into the back side rod 1a and connect it with screw 6. The connection is convenient and quick, making it easy for users to install themselves.

[0035] like Figure 2-7As shown, along the side view direction, the support rod 4 is L-shaped, allowing the mounting portion 2a at the bottom of the lower back frame 2 to connect forward with the seat. Furthermore, the support rod 2b and the backrest rod 1a are bent, with an included angle of 145°. This allows the upper end of the elastic side connecting rod 3 to be inserted into the bottom of the lower back frame 2 without interference between the three components.

[0036] like Figure 3-7 As shown, the upper end of the elastic side connecting rod 3 has an upwardly protruding insertion root 7, and the insertion tongue 4 extends upward from the insertion root 7. The slot 5 is correspondingly located at the bottom of the back side rod 1a, and the slot 5 has an outwardly flared opening at the bottom to form a groove 8 for insertion with the insertion root 7. When the elastic side connecting rod 3 and the back side rod 1a are inserted vertically, the insertion tongue 4 is inserted upward into the slot 5, and when the insertion tongue 4 is fully inserted into the slot 5, the insertion root 7 will simultaneously be inserted into the groove 8, so that the upper end of the elastic side connecting rod 3 and the bottom of the back side rod 1a are tightly joined. With this connection structure, when the elastic side connecting rod 3 is connected to the back side rod 1a and is under force, the force is mainly concentrated between the insertion root 7 and the back side rod 1a. The insertion root 7 is thicker than the insertion tongue 4, thus making the connection stronger. Furthermore, the tongue 4 is provided with a connecting hole 9 for connecting screws; a mounting hole 10 is provided at the corresponding position on the front end face of the back side rod 1a, penetrating into the slot 5; after the elastic side connecting rod 3 and the back side rod 1a are inserted, the mounting hole 10 and the connecting hole 9 are aligned; then the screw 6 is inserted from the front end of the back side rod 1a into the mounting hole 10 and connected into the connecting hole 9, thereby enabling the elastic side connecting rod 3 and the back side rod 1a to be inserted and fixed. Only one screw 6 is needed for connection, making the connection convenient and quick; the tongue 4 and the slot 5 serve to position and connect the screw; and after insertion, the insertion root 7 is the main load-bearing structure; thus, the structure directly distributes the force, making the connection stable.

[0037] like Figure 3-5 As shown, the mounting hole 10 is a countersunk hole, and after the screw 6 is installed, the screw 6 will not protrude from the front end face of the backrest rod 1a. Furthermore, after the elastic side connecting rod 3 is connected to the backrest rod 1a, a back support mesh 11 is provided at the front end of the seat back to provide back support; this back support mesh 11 covers the front end faces of the backrest rod 1a and the elastic side connecting rod 3. Thus, the back support mesh 11 can cover and hide the screw 6, thereby improving the appearance and resulting in a better overall seat back design.

[0038] like Figure 8-9As shown, the present invention further provides a chair, including a base 12, a seat assembly 13, and the aforementioned seat back; wherein, the mounting portion 2a at the bottom of the lower back frame 2 is fixed to the rear end of the base 12 by screws; the seat assembly 13 includes seat side rods 13a located on the left and right sides respectively, and an elastic side connecting rod 3 extends downward and forward from the bottom of the back side rod 1a to the rear end of the seat side rod 13a, and the elastic side connecting rod 3 is detachably connected to the seat side rod 13a. This creates a linkage between the seat back 1 and the seat assembly 13; the two are connected together by the elastic side connecting rod 3, resulting in good seat-back integration; and ensuring that the user's lumbar region is always supported when the seat back is reclined, preventing "lumbar slippage".

Claims

1. A chair backrest, characterized in that... include: The back support body is a frame structure, including an upper back frame at the top and a lower back frame at the bottom; the upper back frame includes back side rods located on the left and right sides respectively, and the lower back frame includes a mounting part at the bottom and support rods extending upward from the mounting part to the left and right sides respectively; and the upper back frame and the lower back frame are an integral structure, with the support rods inclined downward and backward from the bottom of the back side rods. The flexible side link is configured to be detachably connected to the back side link; the flexible side link has an "L" shaped structure, and extends downward and forward from the bottom of the back side link; a tongue is provided on one of the back side link or the flexible side link, and a corresponding slot is provided on the other of the upper back side link or the connecting side link; the flexible side link and the back side link are inserted into each other and fixed together by screws, which are configured to pass through from the front side of the chair back assembly to the rear.

2. The seat back as described in claim 1, characterized in that: The front end of the chair back assembly is also provided with a back support mesh, which covers the front end surfaces of the back side rod and the elastic side connecting rod.

3. The seat back as described in claim 1, characterized in that: The tongue is mounted on the elastic side connecting rod, and the slot is correspondingly mounted at the bottom of the back side rod.

4. The seat back according to claim 3, characterized in that: The tongue is provided with a connecting hole, and a mounting hole is provided at the corresponding position on the front end face of the backrest rod, which passes through the slot; the screw passes from the front side of the chair back assembly to the rear, enters the mounting hole, and is connected in the connecting hole.

5. The seat back according to claim 3, characterized in that: The upper end of the elastic side connecting rod is provided with an upwardly protruding insertion root, and the tongue extends upward from the insertion root; the slot is correspondingly provided at the bottom of the back side rod, and the bottom opening of the slot is expanded outward to form a groove for insertion with the insertion root; the elastic side connecting rod and the back side rod are inserted vertically to allow the tongue to be inserted into the slot, and the insertion root is embedded in the groove.

6. The seat back according to claim 1 or 4, characterized in that: The elastic side link and the back side link are connected by a single screw.

7. The seat back according to claim 1, characterized in that: The angle between the support rod and the back side rod is between 135° and 165°.

8. A type of seat, characterized in that: The device includes a base, a seat assembly, and a seat back as described in any one of claims 1-7; the mounting portion at the bottom of the lower back frame is connected to the rear end of the base; the seat assembly includes seat side rods located on the left and right sides respectively, and the elastic side connecting rod extends downward and forward from the bottom of the back side rod to connect with the rear end of the seat side rod; the elastic side connecting rod is detachably connected to the seat side rod.

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