Up-down adjustable waist rest of chair backrest

Abstract

The utility model discloses an up-and-down adjustable waist rest of a chair backrest, which comprises a backrest body, a first shell is fixedly connected to the backrest body, a connecting seat is sleeved in the first shell, the connecting seat is connected to the backrest body in a sliding manner, and locking components are mounted on the connecting seat and the first shell. A second shell is connected to the first shell in a sliding mode, a waist rest body is hinged to the second shell, and a back cushion is connected to the waist rest body in a sliding mode; the back cushion, the waist rest body and the backrest body are all designed in an adjustable mode, so that the height of the back cushion can be suitable for users of different body types, the height position of the waist rest body and the height position of the backrest body are locked through the locking assembly, and the locking assembly is simple in structure, easy to operate and good in practicability; according to the utility model, the waist rest body and the second shell adopt a hinged design, and the spring is used for providing elastic force for the waist rest body, so that the back cushion can be better attached to the waist, and the use comfort of the chair is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of chairs, in particular to an up-and-down adjustable lumbar support for a chair backrest. Background Technique

[0002] As one of the key accessories of a chair, the lumbar support is installed on the chair backrest, and its function is to provide support for the waist to improve the comfort of using the chair. The existing lumbar support has poor adjustability and cannot meet the needs of users with different body types; in addition, most of the existing lumbar supports use hard supports and lack the space for resilience, and cannot closely fit the waist, resulting in poor comfort. Summary of the Invention

[0003] The purpose of the utility model is to provide an up-and-down adjustable lumbar support for a chair backrest to solve the problems raised in the above background technique.

[0004] In order to solve the above technical problems, the utility model provides the following technical solution: an up-and-down adjustable lumbar support for a chair backrest, including a backrest body, a first shell is fixedly connected to the backrest body, a connecting seat is sleeved in the first shell, and the connecting seat is slidably connected to the backrest body. Locking components are installed on both the connecting seat and the first shell. A second shell is slidably connected to the first shell, a lumbar support body is hinged to the second shell, a cushion is slidably connected to the lumbar support body, a spring is fixedly connected to the lumbar support body, and the other end of the spring is arranged on the second shell.

[0005] Preferably, a plurality of first chutes are opened on the connecting seat, a first connecting piece is slidably connected in the first chute, and the first connecting piece is fixedly connected to the backrest body.

[0006] Preferably, a plurality of second chutes are opened on the first shell, a second connecting piece is slidably connected in the second chute, and the second connecting piece is fixedly connected to the second shell.

[0007] Preferably, a connecting shaft is fixedly connected to the second shell, and the lumbar support body is hinged to the connecting shaft.

[0008] Preferably, a third chute is opened on the lumbar support body, a slider is slidably connected in the third chute, and the slider is fixedly connected to the cushion.

[0009] Preferably, the locking component includes an installation groove, a tooth groove, a limit groove, a convex block, a first elastic clamping block, a clamping block body, a second elastic clamping block and a clamping groove. Installation grooves are opened on both the connecting seat and the first shell, second elastic clamping blocks are hinged to both the backrest body and the second shell, a first elastic clamping block is hinged to the second elastic clamping block, and the second elastic clamping block and the first elastic clamping block are clamped in the installation groove.

[0010] Preferably, a plurality of tooth grooves are evenly distributed on both inner walls of the installation groove, and the second elastic clamping block and the first elastic clamping block are clamped in the tooth grooves.

[0011] Preferably, a clamping block body is fixedly connected to the first elastic clamping block, and a clamping groove is formed at a position corresponding to the clamping block body on the second elastic clamping block.

[0012] Preferably, a limiting groove is formed at one end of the installation groove, and a convex block is fixedly connected to the other side of the installation groove.

[0013] The up-and-down adjustable lumbar support for a chair back provided by the present utility model has the following advantages: The cushion, the lumbar support body and the backrest body of the present utility model all adopt an adjustable design, so that the height of the cushion can be suitable for users of different body types. The lumbar support body and the backrest body use a locking component to lock the height position. This component has a simple structure and is easy to operate, and has good practicability. The lumbar support body of the present utility model and the second shell adopt a hinge design, and a spring provides elastic force for the lumbar support body, so that the cushion can better fit the waist, thereby further improving the use comfort of the chair. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0015] Figure 1 It is a schematic perspective view of the overall structure of the present utility model;

[0016] Figure 2 It is an exploded perspective view of the overall structure of the present utility model;

[0017] Figure 3 is Figure 2 an enlarged view of the structure of area A in

[0018] Figure 4 It is a schematic perspective view of the second shell of the present utility model.

[0019] In the figure: 1, connecting seat; 11, first sliding groove; 12, first connecting piece; 2, locking component; 21, installation groove; 22, tooth groove; 23, limiting groove; 24, convex block; 25, first elastic clamping block; 26, clamping block body; 27, second elastic clamping block; 28, clamping groove; 3, backrest body; 4, first shell; 41, second sliding groove; 42, second connecting piece; 5, second shell; 51, connecting shaft; 6, lumbar support body; 61, spring; 62, third sliding groove; 7, cushion; 71, slider. Detailed implementation mode

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the protection scope of the present utility model.

[0021] Please refer to the attached Figure 1 - attached Figure 4, an embodiment provided by the present utility model: an up-and-down adjustable lumbar support for a chair backrest, including a backrest body 3, a first housing 4 is fixedly connected to the backrest body 3, a connecting seat 1 is sleeved in the first housing 4, and the connecting seat 1 is slidably connected to the backrest body 3. Locking components 2 are installed on both the connecting seat 1 and the first housing 4. A second housing 5 is slidably connected to the first housing 4, a lumbar support body 6 is hinged to the second housing 5, a cushion 7 is slidably connected to the lumbar support body 6, a spring 61 is fixedly connected to the lumbar support body 6, and the other end of the spring 61 is arranged on the second housing 5. The connecting seat 1 is used to connect the chair and the backrest body 3, the second housing 5 is used to connect the first housing 4 and the lumbar support body 6. The backrest body 3 can be slid up and down along the connecting seat 1 for adjustment, the second housing 5 can be slid up and down along the first housing 4 for adjustment, and the cushion 7 can be slid up and down along the lumbar support body 6 for adjustment to meet the user's usage requirements; a plurality of first sliding grooves 11 are formed in the connecting seat 1, a first connecting member 12 is slidably connected in the first sliding grooves 11, and the first connecting member 12 is fixedly connected to the backrest body 3. The first sliding grooves 11 cooperate with the first connecting member 12 to achieve the sliding connection between the connecting seat 1 and the backrest body 3; a plurality of second sliding grooves 41 are formed in the first housing 4, a second connecting member 42 is slidably connected in the second sliding grooves 41, and the second connecting member 42 is fixedly connected to the second housing 5. The second sliding grooves 41 cooperate with the second connecting member 42 to achieve the sliding connection between the second housing 5 and the first housing 4; a connecting shaft 51 is fixedly connected to the second housing 5, and the lumbar support body 6 is hinged to the connecting shaft 51. The connecting shaft 51 is used to install the lumbar support body 6; a third sliding groove 62 is formed in the lumbar support body 6, a slider 71 is slidably connected in the third sliding grooves 62, and the slider 71 is fixedly connected to the cushion 7. The third sliding grooves 62 cooperate with the slider 71 to achieve the sliding connection between the lumbar support body 6 and the cushion 7; the locking component 2 includes an installation groove 21, a tooth groove 22, a limiting groove 23, a convex block 24, a first elastic clamping block 25, a clamping block body 26, a second elastic clamping block 27 and a clamping groove 28. Installation grooves 21 are formed on both the connecting seat 1 and the first housing 4, second elastic clamping blocks 27 are hinged to both the backrest body 3 and the second housing 5, a first elastic clamping block 25 is hinged to the second elastic clamping block 27, and the second elastic clamping block 27 and the first elastic clamping block 25 are clamped in the installation groove 21. By using the cooperation of the second elastic clamping block 27 and the first elastic clamping block 25 with the installation groove 21, the locking component 2 can lock the height positions of the backrest body 3 and the second housing 5; a plurality of tooth grooves 22 are evenly distributed on both inner walls of the installation groove 21, and the second elastic clamping block 27 and the first elastic clamping block 25 are clamped in the tooth grooves 22. The tooth grooves 22 are used to limit the second elastic clamping block 27 and the first elastic clamping block 25; a clamping block body 26 is fixedly connected to the first elastic clamping block 25, and a clamping groove 28 is formed at the position corresponding to the clamping block body 26 on the second elastic clamping block 27. The clamping block body 26 cooperates with the clamping groove 28 to achieve the clamping connection between the second elastic clamping block 27 and the first elastic clamping block 25;One end of the installation groove 21 is provided with a limit groove 23, and the other side of the installation groove 21 is fixedly connected with a convex block 24. The limit groove 23 is used to urge the second elastic clamping block 27 and the first elastic clamping block 25 to close, and the convex block 24 is used to urge the second elastic clamping block 27 and the first elastic clamping block 25 to separate.

[0022] Working principle: When using the present utility model, the height positions of the cushion 7, the lumbar support body 6 and the backrest body 3 can be adjusted according to the usage requirements. The specific method is as follows: The cushion 7 slides up and down through the slider 71 in the third chute 62, and the position of the cushion 7 is locked by the friction between the slider 71 and the third chute 62; The lumbar support body 6 and the backrest body 3 are adjusted up and down, and the height is locked by the locking component 2 on the first housing 4. During the upward adjustment process, the first elastic clamping block 25 and the second elastic clamping block 27 of the locking component 2 move upward along the installation groove 21, and at the same time maintain the clamped state with the tooth groove 22 to prevent sliding down. After the first elastic clamping block 25 and the second elastic clamping block 27 completely slide into the limit groove 23, the first elastic clamping block 25 and the second elastic clamping block 27 close together, and the clamping block body 26 is clamped into the clamping groove 28 to keep it in the closed state. At this time, the downward adjustment operation can be carried out. After the first elastic clamping block 25 and the second elastic clamping block 27 move downward and contact the convex block 24, the convex block 24 separates the first elastic clamping block 25 and the second elastic clamping block 27, so that the clamping block body 26 is separated from the clamping groove 28. At this time, the first elastic clamping block 25 and the second elastic clamping block 27 are automatically clamped with the tooth groove 22, so that the upward adjustment operation can be carried out again; Among them, the first chute 11 cooperates with the first connecting piece 12 to realize the sliding connection between the connecting seat 1 and the backrest body 3, the second chute 41 cooperates with the second connecting piece 42 to realize the sliding connection between the second housing 5 and the first housing 4, the connecting seat 1 is used to connect the chair, the connecting shaft 51 is used to realize the hinge connection between the second housing 5 and the lumbar support body 6, and the spring 61 is used to provide elastic force for the lumbar support body 6 to make the leaning more comfortable; A torsion spring is used to provide the reset elastic force between the first elastic clamping block 25 and the second elastic clamping block 27. The torsion spring is not shown in the figure. This method is a common method for providing elastic force and will not be elaborated here.

[0023] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0024] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative efforts.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or equivalently replace some of the technical features. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A lumbar support for a chair backrest that is adjustable up and down, comprising a backrest body (3), characterized in that: The backrest body (3) is fixedly connected to a first shell (4), a connecting seat (1) is sleeved in the first shell (4), and the connecting seat (1) is slidably connected to the backrest body (3), a locking assembly (2) is installed on the connecting seat (1) and the first shell (4), a second shell (5) is slidably connected to the first shell (4), a lumbar support body (6) is hingedly connected to the second shell (5), a cushion (7) is slidably connected to the lumbar support body (6), a spring (61) is fixedly connected to the lumbar support body (6), and the other end of the spring (61) is arranged on the second shell (5).

2. The up and down adjustable lumbar support for a chair backrest according to claim 1, characterized in that: The connection seat (1) is provided with a plurality of first sliding grooves (11), a first connecting member (12) is slidably connected in the first sliding grooves (11), and the first connecting member (12) is fixedly connected to the backrest body (3).

3. The up and down adjustable lumbar support for a chair backrest according to claim 1, characterized in that: The first housing (4) is provided with a plurality of second sliding grooves (41), a second connecting member (42) is slidably connected in the second sliding grooves (41), and the second connecting member (42) is fixedly connected to the second housing (5).

4. The up and down adjustable lumbar support for a chair backrest according to claim 1, characterized in that: A connecting shaft (51) is fixedly connected to the second shell (5), and the lumbar support body (6) is hinged on the connecting shaft (51).

5. The up and down adjustable lumbar support for a chair backrest according to claim 4, characterized in that: The lumbar support body (6) is provided with a third sliding groove (62), a sliding block (71) is slidably connected in the third sliding groove (62), and the sliding block (71) is fixedly connected to the back cushion (7).

6. The up and down adjustable lumbar support for a chair backrest according to claim 1, characterized in that: The locking assembly (2) comprises a mounting groove (21), a tooth groove (22), a limiting groove (23), a protrusion (24), a first elastic block (25), a block body (26), a second elastic block (27) and a slot (28); the connecting seat (1) and the first shell (4) are both provided with a mounting groove (21); the backrest body (3) and the second shell (5) are both hingedly provided with a second elastic block (27); the second elastic block (27) is hingedly provided with a first elastic block (25); and the second elastic block (27) and the first elastic block (25) are clamped in the mounting groove (21).

7. The up and down adjustable lumbar support for a chair backrest according to claim 6, characterized in that: A plurality of tooth grooves (22) are evenly distributed on the inner walls on both sides of the installation groove (21), and the second elastic clamping block (27) and the first elastic clamping block (25) are clamped in the tooth grooves (22).

8. The up and down adjustable lumbar support for a chair backrest according to claim 7, characterized in that: A card block body (26) is fixedly connected to the first elastic card block (25), and a card slot (28) is provided on the second elastic card block (27) at a position corresponding to the card block body (26).

9. The up and down adjustable lumbar support for a chair backrest according to claim 7, characterized in that: A limiting groove (23) is provided at one end of the installation groove (21), and a protrusion (24) is fixedly connected to the other side of the installation groove (21).

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