Chair waist and backrest connecting device and chair structure

Abstract

According to the chair waist and backrest connecting device and the chair structure, a plurality of backrests or waist rests can be arranged on a support of a chair according to needs, the backrests or the waist rests can be installed on the support or partially installed on the support, and other backrests or waist rests which are not connected to the support are connected with other backrests or waist rests through the connecting device. Therefore, a specific chair waist-back structure is formed. When a user sits on the chair and leans backwards, all the back rests and all the waist rests can respectively provide corresponding supporting effects, and the different back rests and waist rests interact through the connecting devices so as to disperse stress and avoid damage caused by excessive pressure; when the single-side inclination of the user is too large, the pressed backrest or waist rest can pull other backrests or waist rests through the connecting device, so that other backrests or waist rests can be kept to be attached to the back of the human body, more stable use support is provided for the user, and the use comfort is improved.

Description

Technical Field

[0001] The utility model relates to a chair, in particular to a device provided with a plurality of back grooves or waist grooves and used for connecting these lumbar back cushions, and a chair structure using the device. Background Art

[0002] Traditional chairs include a seat for sitting, chair legs installed at the bottom of the seat, and a backrest installed on the back of the seat. With the continuous development of technology and the improvement of people's usage requirements, the design of chairs needs to be more ergonomic to improve the usage comfort. For this reason, modern ergonomic chairs will also be provided with a lumbar support for supporting the waist and a more comfortable backrest, and even multiple lumbar back cushions will be provided according to different usage requirements. For example, in the Chinese patent with the publication number CN106963164A, lumbar supports are respectively installed on the left and right sides of the seat support through an adaptive adjustment mechanism, and by setting two lumbar supports on the left and right, suitable support is provided for different lumbar shapes. However, there are still some problems with this type of chair. For example, when the user leans only on one side of the lumbar support, this lumbar support will be subjected to greater pressure, which is easy to damage and reduce the service life, and the waist on the other side of the user cannot obtain support, resulting in poor usage comfort. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a device capable of connecting different backrests and lumbar supports of a chair and a chair structure using the device, so as to improve the structural strength and usage comfort.

[0004] The chair lumbar backrest connection device described in the utility model includes fixing seats respectively installed on different backrests or lumbar supports, spherical grooves are respectively arranged in each fixing seat, and ball heads are respectively arranged in the spherical grooves of different fixing seats, and the ball heads are connected to each other through a connecting rod.

[0005] Further, the fixing seat includes a base and a pressing block which are detachably connected to each other, the base and the pressing block are connected to each other through a fixing member, and spherical grooves for placing the ball heads are oppositely arranged on one side where the base and the pressing block are in contact with each other.

[0006] Further, the connecting rod is an elastic member with elasticity.

[0007] The chair structure described in the utility model includes a bracket, and a plurality of backrests and lumbar supports installed on the bracket, and a chair lumbar backrest connection device is installed between at least two adjacent backrests or at least two adjacent lumbar supports.

[0008] Further, two or more backrests are installed horizontally along the upper part of the bracket, and a chair lumbar backrest connection device is installed between each adjacent backrest.

[0009] Further, the backrest includes an upper backrest and a lower backrest which are arranged opposite to each other up and down. One, two or more upper backrests and lower backrests are both arranged horizontally, and a chair lumbar-backrest connecting device is connected between adjacent upper backrests and between adjacent lower backrests respectively.

[0010] Further, two or more lumbar rests are installed horizontally at the lower part of the bracket, and the lumbar rests on both sides are fixedly installed on the bracket.

[0011] Further, three or more lumbar rests are installed horizontally at the upper part of the bracket, and a chair lumbar-backrest connecting device is installed between each adjacent lumbar rest.

[0012] Further, four or more lumbar rests are installed horizontally at the upper part of the bracket. An elastic shrapnel is connected between the lumbar rests on both sides and the adjacent lumbar rests, and a chair lumbar-backrest connecting device is connected between the middle lumbar rests.

[0013] Further, the middle lumbar rest is arranged in a suspended manner and is not connected to the bracket.

[0014] Further, a chair lumbar-backrest connecting device is installed between adjacent backrests, between adjacent lumbar rests, and between the backrest and all or part of the lumbar rests below it respectively.

[0015] For the described chair lumbar-backrest connecting device and chair structure, multiple backrests or lumbar rests can be arranged on the bracket of the chair as needed. Each backrest or each lumbar rest can be respectively installed on the bracket, or part of them can be installed on the bracket, while the other backrests or lumbar rests not connected to the bracket are connected to other backrests or lumbar rests through the connecting device, thus forming a specific chair lumbar-backrest structure. When the user sits on the chair and leans back, each backrest and each lumbar rest will respectively provide corresponding supporting effects, and different backrests and lumbar rests interact with each other through the connecting device to disperse the force and avoid damage due to excessive pressure. If the user has a large unilateral inclination, the compressed backrest or lumbar rest can pull other backrests or lumbar rests through the connecting device, so that the other backrests or lumbar rests can remain in contact with the user's back, thus providing a more stable use support for the user and improving the use comfort. In addition, through the arrangement of multiple backrests and lumbar rests, more adjustment freedoms can be formed, so as to adapt to more postural deformations and form a stable common support through the connecting device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the chair lumbar-backrest connecting device.

[0017] Figure 2 is an exploded structural diagram of the chair lumbar-backrest connecting device.

[0018] Figure 3 is a schematic connection structure diagram of the ball head and the connecting rod.

[0019] Figure 4 、 5 Schematic diagram of the structure of the first embodiment of the chair structure.

[0020] Figure 6 Schematic diagram of the structure of the second embodiment of the chair structure.

[0021] Figure 7 Schematic diagram of the structure of the third embodiment of the chair structure.

[0022] Figure 8 、 9 Schematic diagram of the structure of the fourth embodiment of the chair structure.

[0023] Figure 10 Schematic diagram of the structure of the fifth embodiment of the chair structure.

[0024] Figure 11 Schematic diagram of the structure of the sixth embodiment of the chair structure.

[0025] Figure 12 Schematic diagram of the structure of the seventh embodiment of the chair structure.

[0026] Figure 13 Schematic diagram of the structure of the eighth embodiment of the chair structure.

[0027] Figure 14 Schematic diagram of the structure of the ninth embodiment of the chair structure.

[0028] Figure 15 Schematic diagram of the structure of the tenth embodiment of the chair structure.

[0029] Figure 16 Schematic diagram of the structure of the eleventh embodiment of the chair structure. Detailed implementation manners

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] It should be noted that if there are directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...) involved in the embodiments of the present invention, then the directional indications are only used to explain the relative position relationship and movement conditions between components in a certain specific posture (as shown in the accompanying drawings). If this specific posture changes, then the directional indications will also change accordingly.

[0032] If there are descriptions such as "first" or "second" in the embodiments of the present utility model, the descriptions of "first" or "second" are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. Additionally, the technical solutions between various embodiments may be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0033] The present utility model provides a connecting device for the chair backrest and lumbar support.

[0034] The connecting device for the chair backrest and lumbar support in this embodiment includes fixed seats 3 respectively installed on different backrests 1 or lumbar supports 2. Each fixed seat is respectively provided with a spherical surface groove 31, and there are also ball heads 4 respectively arranged in the spherical surface grooves of different fixed seats. The ball heads are connected to each other through a connecting rod 5.

[0035] As Figure 1-3 shown, multiple backrests or lumbar supports can be provided on the chair bracket as needed. Each backrest or each lumbar support can be respectively installed on the bracket, or some can be installed on the bracket, while the other backrests or lumbar supports not connected to the bracket are connected to other backrests or lumbar supports through the connecting device, thereby forming a specific chair backrest and lumbar support structure.

[0036] For the connecting device for the chair backrest and lumbar support described above, the fixed seat 3 includes a base 32 and a pressing block 33 that are detachably connected to each other. The base and the pressing block are connected to each other through a fixing member 34. On the opposite sides of the base and the pressing block that are in contact with each other, there are spherical surface grooves 31 for placing the ball heads 4. The spherical surface grooves sandwich the ball heads between the base and the pressing block to ensure that the ball heads can rotate smoothly without falling off. Its structure is simple, the work is stable, and the disassembly and assembly operations are easy.

[0037] For the connecting device for the chair backrest and lumbar support described above, the connection part between the ball head 4 and the connecting rod 5 is a strengthening part 6 to improve its structural strength and reduce the risk of fracture. The connecting rod 5 can be a rigid member. The relative position between the backrest and the lumbar support is changed by adjusting the ball head and the spherical surface groove to adapt to the adjustment of the user's posture. However, this will affect the convenience of adjusting the backrest and the lumbar support. For this reason, the connecting rod 5 can be set as an elastic member with elasticity, providing better buffering while facilitating adjustment and fitting the user's back better.

[0038] The present utility model also provides a chair structure.

[0039] Embodiment 1, as Figure 4 、 5 shown.

[0040] The chair structure of this embodiment includes a bracket 10, with a backrest 1 installed on the upper part of the bracket, and two lumbar supports 2 installed horizontally on the lower part of the bracket. A chair lumbar-backrest connection device is connected between the two lumbar supports; and the two lumbar supports 2 are respectively fixedly installed on the bracket 10.

[0041] Adjacent backrests or lumbar supports are connected through the chair lumbar-backrest connection device to transfer force and limit positions, and can also drive all backrests and lumbar supports to keep fitting with the human back, improving the use comfort.

[0042] Embodiment 2, as Figure 6 shown; Embodiment 3, as Figure 7 shown.

[0043] For the chair structures of Embodiment 2 and Embodiment 3, three or more lumbar supports 2 are installed horizontally on the lower part of the bracket 10, and a chair lumbar-backrest connection device is connected between adjacent lumbar supports; and the two lumbar supports on both sides are fixedly installed on the bracket 10, and the middle lumbar support is suspended and not directly connected to the bracket.

[0044] Embodiment 4, as Figure 8 、 9 shown.

[0045] For the chair structure of this embodiment, two backrests 1 are installed horizontally on the upper part of the bracket 10, and a chair lumbar-backrest connection device is connected between the two backrests; and the two backrests 1 are respectively fixedly installed on the bracket 10.

[0046] Embodiment 5, as Figure 10 shown; Embodiment 6, as Figure 11 shown.

[0047] For the chair structures of Embodiment 5 and Embodiment 6, three or more lumbar supports 2 are installed horizontally on the lower part of the bracket 10, and a chair lumbar-backrest connection device is connected between adjacent lumbar supports; and the two lumbar supports 2 on both sides are fixedly installed on the bracket 10, and the middle lumbar support is suspended and not directly connected to the bracket.

[0048] Embodiment 7, as Figure 12 shown.

[0049] For the chair structure of this embodiment, a chair lumbar-backrest connection device is respectively installed between adjacent backrests 1, between adjacent lumbar supports 2, and between a backrest and all or part of the lumbar supports 2 below it.

[0050] Embodiment 8, as Figure 13 shown; Embodiment 9, as Figure 14 shown.

[0051] The chair structures of Embodiment VIII and Embodiment IX have four of the lumbar supports 2. The lumbar supports 2 on both sides are fixedly installed on the bracket 10, and an elastic shrapnel 7 is connected between the lumbar supports on both sides and the adjacent lumbar supports. A chair lumbar-backrest connecting device is connected between the middle lumbar supports.

[0052] Embodiment X, as Figure 15 shown.

[0053] The chair structure of this embodiment, the backrest 1 includes an upper backrest 11 and a lower backrest 12 which are arranged oppositely up and down. One, two or more upper backrests and lower backrests are arranged horizontally, and a chair lumbar-backrest connecting device is connected between adjacent upper backrests and between adjacent lower backrests respectively.

[0054] Embodiment XI, as Figure 16 shown.

[0055] The chair structure of this embodiment, its backrest 1 includes an upper backrest 11, a lower backrest 12, and a middle backrest 13 between the upper backrest 11 and the lower backrest. Two upper backrests, middle backrests, lower backrests and lumbar supports are arranged horizontally. Each row of backrests is connected by the chair lumbar-backrest connecting device.

[0056] The middle backrest can be arranged in two or more rows. Each row of backrests can be arranged horizontally with only one, or two or more.

[0057] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. The chair backrest can also be arranged in one row, two rows, three rows, four rows or more longitudinally. Each row can be arranged horizontally with one, two, three, four, five or more backrests respectively. The chair lumbar support can also be arranged in one row, two rows, three rows, four rows or more longitudinally. Each row can be arranged horizontally with one, two, three, four, five or more lumbar supports respectively. The longitudinal rows and horizontal numbers of the chair backrest and the chair lumbar support are determined according to the actual situation and are not limited. Adjacent left and right backrests or adjacent left and right lumbar supports can all be connected by the chair lumbar-backrest connecting device, or part of them can be connected by the chair lumbar-backrest connecting device, or part of them can be connected by the chair lumbar-backrest connecting device and the rest can be connected by elastic members. In addition, adjacent upper and lower rows can also be all connected or part of them can be connected by the chair lumbar-backrest connecting device, or part of them can be connected by the chair lumbar-backrest connecting device and the rest can be connected by elastic members. The elastic members used for connection can be shrapnel, coil springs and other mechanisms that can provide certain elastic support. And any equivalent structural transformation made under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are all included in the patent protection scope of the present invention.

Claims

1. A connecting device for the lumbar backrest of a chair, characterized in that: It includes fixing seats (3) respectively installed on different backrests (1) or lumbar supports (2). Spherical grooves (31) are respectively arranged in each fixing seat. There are also ball heads (4) respectively arranged in the spherical grooves of different fixing seats, and the ball heads are connected to each other through a connecting rod (5).

2. The chair lumbar backrest connection device according to claim 1, characterized in that: The fixing seat (3) includes a base (32) and a pressing block (33) which are detachably connected to each other. The base and the pressing block are connected to each other through a fixing member (34). Spherical grooves (31) for placing the ball head (4) are oppositely arranged on one side where the base and the pressing block are in contact with each other.

3. The chair lumbar backrest connection device according to claim 1 or 2, characterized in that: The connecting rod (5) is an elastic member with elasticity.

4. A chair structure, comprising, characterized in that: It includes a bracket (10), and a plurality of backrests (1) and lumbar supports (2) installed on the bracket. A chair lumbar support and backrest connecting device as described in any one of claims 1-3 is installed between at least two adjacent backrests or between at least two adjacent lumbar supports.

5. The chair structure according to claim 4, wherein: Two or more backrests (1) are installed horizontally along the upper part of the bracket (10), and a chair lumbar support and backrest connecting device is installed between adjacent backrests respectively.

6. The chair structure according to claim 4, characterized in that: The backrest (1) includes an upper backrest (11) and a lower backrest (12) which are oppositely arranged up and down. The upper backrest and the lower backrest are each arranged horizontally in one, two or more numbers, and a chair lumbar support and backrest connecting device is respectively connected between adjacent upper backrests and between adjacent lower backrests.

7. The chair structure according to claim 4, characterized in that: Two or more lumbar supports (2) are installed horizontally along the lower part of the bracket (10), and the lumbar supports on both sides are fixedly installed on the bracket.

8. The chair structure according to claim 7, characterized in that: Three or more lumbar supports (2) are installed horizontally along the upper part of the bracket (10), and a chair lumbar support and backrest connecting device is installed between adjacent lumbar supports respectively.

9. The chair structure according to claim 7, wherein: Four or more lumbar supports (2) are installed horizontally along the upper part of the bracket (10). An elastic shrapnel (7) is connected between the lumbar supports on both sides and the adjacent lumbar supports, and a chair lumbar support and backrest connecting device is connected between the middle lumbar supports.

10. The chair structure according to claim 8 or 9, characterized in that: The middle lumbar support (2) is arranged in a suspended manner and is not connected to the bracket (10).

11. The chair structure according to any one of claims 4-9, characterized in that: A chair lumbar support and backrest connecting device is respectively installed between adjacent backrests (1), between adjacent lumbar supports (2), and between the backrest and all or part of the lumbar supports (2) below it.

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