Chair back structure and chair structure

Abstract

A backrest is divided into a left part, a middle part and a right part, the left backrest and the right backrest correspond to the left side and the right side of the back of a human body respectively, the spine backrest is arranged between the left backrest and the right backrest and is opposite to the spine part of the human body, needed support is provided for different parts of the human body through the different backrests, and the better supporting effect is achieved; the use comfort of a user is improved; meanwhile, corresponding elastic devices are arranged on the backrests respectively, so that an effect similar to a tight holding effect is formed for the user, tight attachment is formed on the whole back, support is better provided for the user, and the use comfort is further improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to furniture, in particular to the structure of chair backrest. BACKGROUND

[0002] The backrest of the chair is mainly used for supporting the back of the human body, and the traditional chair backrest is of an integrated structure, but as the back of the human body is curved and there is a big difference between different individuals, the integrated chair backrest cannot effectively closely adhere to the back of the human body, resulting in that effective and comfortable supporting effect cannot be provided. Therefore, some ergonomic chairs in the prior art will divide the backrest into two parts which are relatively independent to each other, thereby improving the adhesion of the backrest to the back of the human body. However, there is a gap between the left and right backrests of such ergonomic chair, and the gap cannot provide special support for the spine part of the human body. In addition, the bones and muscles on both sides of the spine and the back of the human body are significantly different, and the support requirements are also different. Neither the traditional chair nor the existing ergonomic chair can provide appropriate support for the spine and the back on both sides, respectively. SUMMARY

[0003] The utility model aims at providing a chair backrest structure which can provide support for the back on both sides of the human body and the spine, respectively, and a chair using the chair backrest, so as to improve the comfort of use.

[0004] The chair backrest structure comprises a left backrest and a right backrest which are opposite to the left and right sides of the back of the human body, and a spine backrest which is arranged between the left backrest and the right backrest and supports the spine part of the human body, wherein the spine backrest is vertically arranged and opposite to the spine of the human body, and the left backrest, the spine backrest and the right backrest are independently arranged.

[0005] The chair structure comprises the chair backrest structure as described above.

[0006] The chair backrest structure and the chair structure are divided into three parts, i.e. a left part, a middle part and a right part, which correspond to the left side of the back of the human body, the spine in the middle of the back of the human body and the right side of the back of the human body, respectively. When a user sits on the chair and leans back, the left backrest and the right backrest support the left and right sides of the back of the user, respectively, and the spine backrest supports the spine in the middle of the back of the user, so that the required support is provided for different parts of the human body, a better supporting effect is formed, and the comfort of use of the user is improved.

[0007] Preferably, a back frame is fixedly arranged, the left backrest and the right backrest are rotatably mounted on the back frame through elastic mechanisms, and the deformation of the elastic mechanisms exerts a force on the left backrest and the right backrest to make them rotate; and the spine backrest is mounted on the back frame through a spine elastic member which has elasticity.

[0008] Preferably, the spine backrest comprises a plurality of spine backrest units arranged vertically in sequence, each spine backrest unit being connected to the back frame by a spine elastic member.

[0009] Preferably, the spine backrest comprises a plurality of spine backrest units arranged vertically in sequence, each spine backrest unit being connected to the back frame by a spine elastic member.

[0010] Preferably, the spine elastic member is an elastic ring, two ends of the elastic ring being connected to the back frame and the spine backrest respectively.

[0011] Preferably, the spine elastic member is a compression spring, two ends of the compression spring being connected to the spine backrest and the back frame respectively.

[0012] Preferably, the back frame comprises a fixed base and a lifting seat moving up and down relative to the base, the spine backrest being mounted on the lifting seat.

[0013] Preferably, the back frame comprises a fixed base and a lifting seat moving up and down relative to the base, the left backrest, the right backrest and the spine backrest being mounted on the lifting seat; the base is provided with a vertical guide slot, two sides of the guide slot are provided with a plurality of vertical positioning slots, and the positioning slots are arranged obliquely upward; the lifting seat is provided with two positioning blocks arranged transversely, one end of the two positioning blocks is rotatably mounted on the lifting seat, the other end of the two positioning blocks is a clamping portion, a clamping assembly and a positioning elastic member are arranged between the middle portions of the two positioning blocks and are fixed to each other, and the positioning elastic member applies a force to the positioning blocks in the direction of the positioning slots; the top of the guide slot is a clamping guide portion for applying a relative moving force to the two positioning blocks and driving the clamping assembly to be fixed to each other, and the bottom of the guide slot is provided with an unlocking guide block inserted between the two positioning blocks and driving the clamping assembly to be separated from each other.

[0014] Preferably, the base is provided with a toothed rack with teeth inclined upward, and a clamping plate is further provided, the clamping plate is provided with clamping teeth matched with the toothed rack, the lifting seat is provided with a clamping plate mounting slot opposite to the bottom of the toothed rack, the bottom of the clamping plate mounting slot is provided with a clamping plate limiting block capable of blocking the bottom of the clamping plate, the clamping plate is arranged in the clamping plate mounting slot and connected with the clamping plate mounting slot through a clamping plate spring, the base is provided with an upper pressing block above the toothed rack and a lower pressing block below the toothed rack, the clamping plate mounting slot is provided with a gap above and below the clamping plate mounting slot for the upper pressing block or the lower pressing block to pass through, the upper pressing block passes through the gap and abuts against the top of the clamping plate and presses the bottom of the clamping plate into the inner side of the clamping plate limiting block, and the lower pressing block passes through the gap and abuts against the bottom of the clamping plate and pushes it out of the clamping plate limiting block.

[0015] Preferably, there is a transversely or obliquely arranged support, one end of the support is rotatably connected to the left backrest or the right backrest through an elastic mechanism, and the other end of the support is rotatably connected to the back frame through another elastic mechanism.

[0016] Preferably, the elastic mechanism is a torsion spring; the left backrest, the right backrest or the back frame is provided with a connecting seat, the connecting seat is provided with a recessed seat groove, the seat groove is provided with a limiting groove, the end of the bracket is arranged in the seat groove and is hinged to the connecting seat through a rotating shaft, the end of the bracket is further provided with a recessed torsion spring mounting groove, and the torsion spring is mounted in the torsion spring mounting groove and one end of the torsion spring is arranged in the limiting groove.

[0017] Preferably, the left backrest, the right backrest or the back frame is provided with a connecting seat, the upper and lower ends of the connecting seat are oppositely provided with connecting plates, coaxial through holes are opened in the two connecting plates; one end of the bracket is arranged between the two connecting plates, and the end of the bracket is provided with a containing cavity for placing the elastic mechanism, the elastic mechanism is a torsion spring; a connecting shaft passes through the two connecting plates and the containing cavity therebetween in sequence, the torsion spring is sleeved outside the connecting shaft, and the bracket and the left backrest, the right backrest or the back frame are provided with a torsion spring positioning groove for placing the end of the torsion spring. Preferably, the bracket is rotatably connected with the connecting seat through the elastic mechanism, and the left backrest and the right backrest are liftably mounted on the connecting seat; the left backrest and the right backrest are provided with vertical lifting through grooves, the connecting seat is mounted at the lifting through grooves and is vertically spaced apart and provided with a plurality of lifting positioning holes, the left backrest and the right backrest are provided with liftable lifting clamping blocks, the lifting clamping blocks are provided with positioning clamping blocks which can be inserted into the lifting positioning holes, and the lifting clamping blocks and the left backrest and the right backrest are provided with lifting adjusting springs for pushing the lifting clamping blocks to the lifting positioning holes.

[0018] Through the arrangement of the chair back and the chair structure, the chair back can better fit the human back, and the use comfort of the user is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 2 is a structural schematic diagram of a chair back structure embodiment one.

[0020] Figure 3 is a top view structural schematic diagram of a chair back structure.

[0021] Figures 4-6 is a connecting structure schematic diagram of a back frame and a spine backrest.

[0022] Figure 7 is a structural schematic diagram of another connecting mode of a back frame and a spine backrest.

[0023] Figure 8 is a structural schematic diagram of a spine backrest with a sleeve kit.

[0024] Figure 9 is a structural schematic diagram of an arc surface spine backrest.

[0025] Figure 10 11 is a structural schematic diagram of a back frame. ​​

[0026] Figure 12 is the schematic diagram of the exploded structure of the backrest.

[0027] Figure 13 is the schematic diagram of the connecting structure of the lifting seat and the positioning block.

[0028] Figure 14 is the schematic diagram of the connecting and lifting adjustment structure of the base and the positioning block.

[0029] Figure 15 is the schematic diagram of the connecting structure of the support and the backrest.

[0030] Figures 16-18 is the schematic diagram of the partial structure of the connecting of the support and the backrest.

[0031] Figure 19 , 20 is the schematic diagram of the structure of the second embodiment of the chair backrest.

[0032] Figure 21 is the schematic diagram of the partial structure of the second embodiment.

[0033] Figures 22-24 is the schematic diagram of the connecting structure of the backrest and the support of the second embodiment.

[0034] Figure 25 is the schematic diagram of the structure of the third embodiment of the chair backrest.

[0035] Figure 26 is the schematic diagram of the partial structure of the third embodiment.

[0036] Figure 27 is the schematic diagram of the state of the lifting adjustment.

[0037] Figure 28 is the schematic diagram of the structure of the fourth embodiment of the chair backrest.

[0038] Figure 29 , 30 is the schematic diagram of the partial structure of the fourth embodiment.

[0039] Figures 31-35 is the schematic diagram of the structure of the five different embodiments.

[0040] Figure 36 is the schematic diagram of the adjustment state of the chair backrest. DETAILED DESCRIPTION

[0041] ​​The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of the present application.

[0042] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, top, bottom, inner, outer, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications also change accordingly.

[0043] In the description of the present application, it should be noted that unless explicitly specified and limited, the terms "mounting", "setting", "provided with", "connected", "connected" should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be the communication between two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0044] If the embodiments of the present application involve "first" or "second" or the like, the "first" or "second" or the like is only for description purpose, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, if the meaning of several is more than one, the meaning of multiple is more than two, above, below, within, etc. are understood to include the number. In addition, the technical features of each embodiment can be combined arbitrarily, and in order to make the description simple, all possible combinations of the technical features in the embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, it should be considered that it is within the scope of the present application.

[0045] The present application provides a chair back structure.

[0046] Embodiment one, as shown in Figures 1-18 .

[0047] The backrest structure of the embodiment comprises a left backrest 2 and a right backrest 3 corresponding to the left and right sides of the back of the human body, and a spine backrest 8 arranged between the left backrest and the right backrest and vertically corresponding to the spine of the human body; the left backrest, the spine backrest and the right backrest are independently arranged.

[0048] As shown in Figure 1 、 2 , the backrest is divided into three parts, i.e. a left part, a middle part and a right part, corresponding to the left side of the back of the human body, the spine in the middle of the back of the human body and the right side of the back of the human body respectively. When a user sits on the chair and leans back, the left backrest and the right backrest are respectively supported on the left and right sides of the back of the user, and the spine backrest is specially supported on the spine in the middle of the back of the user, so that the required support is provided for different parts of the human body, a better supporting effect is formed, and the use comfort of the user is improved.

[0049] The backrest structure comprises a fixed back frame 1, a left backrest 2 and a right backrest 3 rotatably arranged on the back frame through elastic mechanisms 4, and the deformation of the elastic mechanisms exerts an action force on the left backrest and the right backrest to make them rotate. The spine backrest 8 is arranged on the back frame through a spine elastic member 9 with elasticity. Through this structure, when the left backrest and the right backrest are pressed, they will have a tendency to rotate. The elastic mechanisms will be deformed during the rotation of the left backrest and the right backrest and generate a rebound force. The action force will drive the left backrest and the right backrest to rotate reversely. The rotating direction can be counterclockwise rotation or clockwise rotation of the left backrest, so as to form an effect similar to hugging or opening outward for the user. Meanwhile, the spine backrest can be tightly pressed on the position of the spine of the human body under the action of the spine elastic member, and can be self-adaptively adjusted relative to the spine of the human body under the stress of the spine backrest. The spine backrest is independently arranged with the left backrest and the right backrest. Compared with the structure in which the spine backrest is not independently arranged with the left backrest and the right backrest, the independent arrangement can make the spine backrest not easily affected by the rotation of the left backrest or the right backrest, and can make the spine backrest have a moving space, so that the spine backrest can be more closely fitted to the curve of the entire back by cooperating with the left backrest and the right backrest, and better support can be provided for the user, and the use comfort is further improved. Figure 3 The backrest structure comprises a fixed back frame 1, a left backrest 2 and a right backrest 3 rotatably arranged on the back frame through elastic mechanisms 4, and the deformation of the elastic mechanisms exerts an action force on the left backrest and the right backrest to make them rotate. The spine backrest 8 is arranged on the back frame through a spine elastic member 9 with elasticity. Through this structure, when the left backrest and the right backrest are pressed, they will have a tendency to rotate. The elastic mechanisms will be deformed during the rotation of the left backrest and the right backrest and generate a rebound force. The action force will drive the left backrest and the right backrest to rotate reversely. The rotating direction can be counterclockwise rotation or clockwise rotation of the left backrest, so as to form an effect similar to hugging or opening outward for the user. Meanwhile, the spine backrest can be tightly pressed on the position of the spine of the human body under the action of the spine elastic member, and can be self-adaptively adjusted relative to the spine of the human body under the stress of the spine backrest. The spine backrest is independently arranged with the left backrest and the right backrest. Compared with the structure in which the spine backrest is not independently arranged with the left backrest and the right backrest, the independent arrangement can make the spine backrest not easily affected by the rotation of the left backrest or the right backrest, and can make the spine backrest have a moving space, so that the spine backrest can be more closely fitted to the curve of the entire back by cooperating with the left backrest and the right backrest, and better support can be provided for the user, and the use comfort is further improved.

[0050] Figure 1 、 Figure 4 ​As shown, each spinal vertebra back unit is connected to the back frame through a spinal vertebra elastic member 9; this is because when a user sits on the chair, the spinal vertebra of the human body is not vertical, but curved, and the spinal vertebra of the human body is composed of multiple vertebrae, for example, an adult generally has 26 vertebrae, and there is a gap between each vertebra, therefore, the setting of multiple spinal vertebra back units not only can correspond to different positions of the spinal vertebra respectively, but also can better adapt to the curve of the human spinal vertebra, provide more suitable support, improve the use comfort, in addition, compared to multiple spinal vertebra back units without gaps or multiple spinal vertebra back units not independent of each other, the design of multiple independent spinal vertebra back units can also make each independent spinal vertebra back unit bear force independently, and at the same time, there is a gap between the vertically adjacent spinal vertebra back units, which can avoid the influence of the force on one spinal vertebra back unit on another spinal vertebra back unit, and can also allow each spinal vertebra back unit to have a certain space for movement, to ensure that the spinal vertebra back is more fitted to the spinal vertebra. In addition, each spinal vertebra back unit can be connected to only one spinal vertebra elastic member 9, and in other embodiments, two or more spinal vertebra elastic members can be installed as needed (for example, some spinal vertebra back units are longer, so two or more elastic members can be installed on one spinal vertebra back unit to provide support), and these multiple spinal vertebra elastic members are arranged side by side in the horizontal or vertical direction, thereby forming more different support shapes such as multiple columns and multiple rows.

[0051] As shown in Figures 4-9 , the spinal vertebra elastic member 9 is an annular elastic ring 91, the two ends of the elastic ring are connected to the back frame 1 and the spinal vertebra back 8 respectively, and the elastic ring will deform elastically when subjected to pressure, thereby pushing the spinal vertebra back towards the back of the user, further allowing the spinal vertebra back to fit the curve of the spinal vertebra and more adaptively support the spinal vertebra; and the two ends of the elastic ring 91 are provided with connecting portions 92 for connecting the back frame 1 and the spinal vertebra back 8, as shown in Figure 5 , 6 , the connecting portions 92 and the spinal vertebra back 8 are provided with a bolt hole 86 opposite to each other, and the elastic ring and the spinal vertebra back unit of the spinal vertebra back are connected and fixed by the bolt 600 passing through the bolt hole 86, one end or both ends of the bolt are provided with concave-convex friction lines to improve the connection strength and prevent the bolt from falling off; at the same time, the spinal vertebra back 8 and the back frame 1 are provided with positioning portions 85 in shapes suitable for the connecting portions 92, such as concave-convex shapes, rectangular shapes or trapezoidal shapes, etc., thereby being positioned to improve the installation convenience, and also play a limiting role to avoid the spinal vertebra back from rotating improperly during use, and improve the support force of the spinal vertebra back. In addition, in other embodiments, the spinal vertebra back unit of the spinal vertebra back 8 and the spinal vertebra elastic member, the back frame 1 can also use other connection methods. Figure 7As shown, screw holes 921 can be provided on the connecting part. The connecting part and the positioning part can be various shapes such as concave, convex, rectangular or trapezoidal to facilitate positioning, installation and limiting. In addition, bolts 500 passing through the back frame 1 or the spine backrest 8 are screwed into the screw holes to connect and fix them, so that the spine backrest unit of the spine backrest 8 has sufficient support.

[0052] like Figures 5-8 As shown, the spine backrest unit of the spine backrest 8 includes a fixing plate 81 connecting the spine elastic element and a panel 82 detachably connected to the fixing plate. The fixing plate and panel are connected by snaps, screws, or other common backrest connection methods to allow the installation of outer covers 84 such as mesh fabric, leather, PVC, rubber, fabric, and airbag fabric on the spine backrest unit. Furthermore, the outer covers can be filled with filling materials such as sponge, latex, a mixture of sponge and latex, cotton, gas, and plastic. Figure 8 This makes the spine backrest softer and more comfortable. Furthermore, the installation or connection of the outer cover, padding, or other components to the spine backrest unit can refer to other existing backrest upholstery or connection technologies; the same applies to the left and right backrests. In other embodiments, the spine backrest unit can be straight, or the entire unit of each spine backrest can be curved, or the surface of each spine backrest unit can be curved, such as... Figure 9 This allows for a better fit to the curve of the spine. Similarly, the padding and outer covering of each spine backrest unit can be flat, such as... Figure 8 It can also be designed with a certain curvature, such as by using shaping cotton to create a curvature, to achieve a similar effect. Figure 9 Its curved shape allows it to better fit and adapt to the curve of the spine.

[0053] The chair back structure includes a back frame 1 with a fixed base 11 and a lifting seat 12 that moves up and down relative to the base. The left backrest 2, right backrest 3, and spinal backrest 8 are all mounted on the lifting seat. The base has a vertically oriented guide groove, and several positioning grooves 13 are vertically oriented on both sides of the guide groove, with the positioning grooves inclined upwards. The lifting seat has two horizontally opposing positioning blocks 14. One end of each positioning block is rotatably mounted on the lifting seat, and the other end is a locking part 15. Between the middle of the two positioning blocks are locking components 16 and positioning elastic elements 17 that engage and fix each other. The positioning elastic elements apply a force to the positioning blocks pointing towards the positioning grooves. The top of the guide groove is a locking guide part 18 that applies relative movement to the two positioning blocks and drives the locking components to engage and fix each other. The bottom of the guide groove is an unlocking guide block 19 that inserts between the two positioning blocks and drives the locking components to disengage. Figures 10-14As shown, the two positioning blocks can be locked into the positioning grooves under the action of the positioning elastic element. Because the positioning grooves are tilted upwards, the lifting seat and its left, right, and spinal backrests are fixed at a specific height to meet the needs of people of different body types. When the user needs to adjust the backrest height upwards, pulling the lifting seat upwards will move the positioning blocks to the uppermost positioning grooves. Figure 14 As shown, when the height needs to be adjusted downwards, the lifting seat moves the positioning blocks to the locking guide. The two positioning blocks, under the action of the locking guide, move relative to each other until the locking assembly between the two positioning blocks is fixed, preventing them from springing back into the positioning groove. At this point, the lifting seat descends to the bottom of the guide groove, and the locking assembly is unlocked by unlocking the guide block. The two positioning blocks spring back open under the action of the positioning elastic element. Then, the user can adjust the lifting seat and backrest to the desired height using the aforementioned method. This type of backrest frame has a simple and compact adjustment structure, making it easy to set and install. It is also simple and convenient to use, and can stably position the backrest at the desired height. The positioning elastic element 17 can be a compression spring, an elastic ring, or an elastic sheet, etc. Furthermore, the locking assembly 16 includes a slot and a block respectively disposed on the two positioning blocks 14. The slot has a concave groove, and the end of the block can be inserted and fixed into the slot for easy locking and fixing. In addition, the base 11 has a lifting limit groove 101, and a lifting limit plate 102 is also installed on the base. A lifting limit component 103 is provided in the lifting limit groove and connects the lifting limit plate and the lifting seat 12, thereby improving the stability and accuracy of the movement of the lifting seat and preventing the lifting seat from falling off or swaying back and forth during the lifting process. The base 11 has two vertically arranged guide bars 10 arranged side by side. The middle of the lifting limit plate 102 and the lifting seat 12 are both located between the two guide bars, thereby limiting and guiding the lifting seat from the lateral direction through the guide bars, preventing the lifting seat from swaying left and right during the lifting process.

[0054] The chair back structure has a transversely or obliquely arranged support 5, one end of the support is rotatably connected with the left backrest 2 or the right backrest 3 through an elastic mechanism 4, the elastic mechanism 4 is arranged between the support and the left backrest and the right backrest and is connected with the end of the support 5 at the middle part of the left backrest 2 and the right backrest 3, so that the left and right backrests can be more smoothly rotated in two different directions, and further closely fit the back of the user. Further, the other end of the support 5 is also rotatably connected with the back frame 1 through the elastic mechanism 4, so as to form two elastic rotating mechanisms. In addition to the rotating fitting effect of one elastic rotating mechanism, the two elastic rotating mechanisms can further rotate in the same direction and the other in the opposite direction, further generating the front and back supporting effect of the left and right backrests horizontally backward or forward, so as to improve the adjusting range of the backrest, better support, follow and fit the back of the user, and further avoid the local position of the back of the human body being stressed too much during leaning, and further improve the comfort. As shown in Figures 15-18 The elastic mechanism 4 is a torsion spring, which is simple in structure and stable in work. Of course, the elastic mechanism can also be a tension spring, a compression spring, a gas spring, an elastic sheet, a leaf spring or other any elastic device. Different springs or elastic sheets are installed on both sides of the hinge end of the backrest, so as to drive the backrest to rotate. In some other embodiments, the elastic rotating mechanism can be arranged only between the support and the left backrest and the right backrest, or only between the support and the back frame 1, so as to realize the rotating requirement. Alternatively, more than three elastic rotating mechanisms can be arranged, and through the arrangement of multiple hinge ends, a larger adjusting range and adjusting state can be formed, further following and fitting the back of the human body, so as to improve the comfort.

[0055] As shown in Figure 16 The back frame 1 is provided with a connecting seat 6, which can be integrally connected with the back frame or detachably connected with the back frame. The connecting seat is provided with a recessed seat groove 61, and a limiting groove 62 is arranged in the seat groove. The end of the support 5 is arranged in the seat groove and is hingedly connected with the connecting seat through a rotating shaft 7. The end of the support is further provided with a recessed torsion spring mounting groove 51, and a torsion spring is arranged in the torsion spring mounting groove and one end of the torsion spring is arranged in the limiting groove 62. Further, the back surface of the left backrest 2 and the right backrest 3 is also provided with a connecting seat 6 which is integrally connected with the left backrest and the right backrest or detachably connected with the left backrest and the right backrest. Figure 17 , 18The connecting seat 6 is provided with a recessed seat groove 61 and a limiting groove 62 in the seat groove. The end of the support 5 is arranged in the seat groove and is hinged to the connecting seat through the rotating shaft 7. The end of the support is also provided with a recessed torsion spring mounting groove 51. The torsion spring is arranged in the torsion spring mounting groove and one end of the torsion spring is arranged in the limiting groove 62 of the seat groove. The structure can ensure the stability of the backrest rotation, so as to more accurately fit the human back and improve the use comfort. Further, the rotating shaft 7 can be sleeved with a rubber sleeve or a plastic tube, so as to reduce the sound generated in the rotation. Obviously, in other embodiments, if the elastic mechanism is not a torsion spring, other elastic mechanisms can be referred to the connection.

[0056] In addition, in other embodiments, the connecting seat 6 can be relatively connected and lifted between the left backrest 2 and the right backrest 3, so as to adjust the backrest to a suitable height to meet the use needs of the user. Alternatively, the connecting seat 6 can be liftable mounted on the back frame 1. Of course, a locking mechanism can be arranged in part or all of the one or more connecting seats 6 or elastic mechanisms 4, so that the backrest can be locked at different angles in the process of rotation. In addition, a buffer mechanism can be arranged between the connecting seat 6 and the left backrest and the right backrest, such as a plurality of springs or elastic soft rubber, so as to reduce the vibration when the backrest rotates.

[0057] Embodiment two, as shown in Figures 19-24 .

[0058] The chair back structure of the embodiment, the spine elastic member 9 is a compression spring. The two ends of the compression spring are respectively connected to the spine backrest 8 and the back frame 1. Specifically, mounting columns or mounting grooves can be arranged on the back frame 1 and the spine backrest 8, and the two ends of the compression spring are fixed to the mounting columns or the mounting grooves. Of course, in other embodiments, the spine elastic member 9 can also be an elastic device such as a gas spring, a hydraulic spring or an electric device. It only needs to apply a force to the spine backrest directed to the user.

[0059] The left backrest 2, the right backrest 3 and the back frame 1 are provided with a connecting seat 6, the upper and lower ends of the connecting seat are oppositely provided with connecting plates 63, and coaxial through holes are formed in the two connecting plates; one end of the support 5 is arranged between the two connecting plates, and the end of the support is provided with a containing cavity for placing the elastic mechanism 4, the elastic mechanism 4 is a torsion spring; a connecting shaft 65 passes through the two connecting plates and the containing cavity between the two connecting plates in sequence, the torsion spring is sleeved on the connecting shaft, the support and the left backrest, the right backrest and the back frame are provided with torsion spring positioning grooves 60 for placing the end of the torsion spring, and the left backrest, the right backrest and the back frame are driven to rotate relative to the support or the support is driven to rotate relative to the back frame by the torsion spring, so that the backrest is tightly attached to the back of the user. The structure is not easy to deviate during rotation and is more stable. Further, the connecting shaft 65 is sleeved with a rubber tube or a plastic sleeve 651, and the torsion spring is sleeved on the rubber tube or the plastic sleeve, so that the sound during rotation is reduced. The torsion spring positioning grooves arranged on the back frame, the support, the left backrest and the right backrest can be strip grooves similar to the end of the torsion spring or cavities abutting against the end of the torsion spring.

[0060] The left backrest 2, the right backrest 3 and the support 5, and the support 5 and the back frame 1 are circumferentially provided with turning limiting blocks 54 and turning limiting grooves 69, so as to limit the excessive rotation of the left and right backrests. Obviously, in some other embodiments, these limiting structures can also not be arranged, so that the rotation range is larger or more free. In addition, a decorative cover 632 can also be added at the two ends of the through hole of the connecting plate.

[0061] In the third embodiment, as shown in the accompanying drawings. Figures 25-27

[0062] The chair back structure of the embodiment, the back frame 1 includes a fixedly arranged base 11 and a lifting seat 12 moving up and down relative to the base, and the left backrest 2, the right backrest 3 and the spine backrest 8 are all mounted on the lifting seat; meanwhile, the back frame 1 includes a fixedly arranged base 11 and a lifting seat 12 moving up and down relative to the base, and the left backrest 2 and the right backrest 3 are both mounted on the lifting seat; meanwhile, the base 11 is provided with a toothed rack 111 with toothed openings inclined upward, and a clamping plate 112 is further arranged, the clamping plate is provided with clamping teeth 113 matched with the toothed rack, the lifting seat is provided with a clamping plate mounting groove 114 opposite to the bottom of the toothed rack, the bottom of the clamping plate mounting groove is provided with a clamping plate limiting block 115 capable of blocking the bottom of the clamping plate, the clamping plate is arranged in the clamping plate mounting groove and connected with the clamping plate mounting groove through a clamping plate spring 116, the base is provided with an upper pressing block 117 above the toothed rack and a lower top block 118 below the toothed rack, the upper and lower ends of the clamping plate mounting groove are respectively provided with notches 119 for passing through the upper pressing block or the lower top block, the upper pressing block passes through the notch and abuts against the top of the clamping plate and presses the bottom of the clamping plate into the inner side of the clamping plate limiting block, and the lower top block passes through the notch and abuts against the bottom of the clamping plate and pushes it out of the clamping plate limiting block. Further, the upper and lower ends of the lifting seat 12 can also be provided with notches 119 to facilitate the upper pressing block or the lower top block to pass through; as shown in the accompanying drawings. Figures 25-27 ​As shown, the rack, the clamping plate, the clamping plate mounting groove are arranged in horizontal direction, when positioned at a certain height, the clamping plate is in the clamping plate mounting groove, the clamping tooth protrudes from the clamping plate mounting groove and is clamped with the tooth opening arranged on the rack, when the backrest needs to be raised, the lifting seat is pulled up, when the backrest needs to be lowered, the lifting seat is pulled to the highest position, the top of the clamping plate abuts against the upper pressing block, so that the clamping plate is subjected to downward force and the bottom of the clamping plate is retracted into the inside of the clamping plate limiting block, at this time, the clamping tooth is separated from the rack, under the action of gravity, the lifting seat is lowered to the bottom, or the lifting seat is pulled down to the bottom, the bottom of the clamping plate abuts against the lower pressing block through the gap, so that the clamping plate is separated from the clamping plate limiting block, then the backrest can be adjusted to the required height. Further, the top of the clamping plate 112 is arc-shaped, which avoids that the clamping plate is clamped in the clamping plate mounting groove during the lifting of the backrest, so that the lifting is more smooth. Similarly, the base 11 and the lifting seat 12 can also be provided with vertical guide components, such as guide strips, lifting limiting plates, limiting grooves and limiting pieces, to improve the accuracy of lifting and adjusting.

[0063] In some embodiments, as shown in Fig. 1, the backrest of the chair is provided with a back frame 1, a left backrest 2 and a right backrest 3, the back frame 1 is provided with a left support 5 and a right support 5, the left backrest 2 and the right backrest 3 are respectively and independently connected to the left support 5 and the right support 5 through elastic mechanisms 4, the left backrest 2 and the right backrest 3 are respectively and independently connected to the left support 5 and the right support 5 through elastic mechanisms 4, and the left backrest 2 and the right backrest 3 are respectively and independently connected to the left support 5 and the right support 5 through elastic mechanisms 4. Figures 28-30

[0064] In some embodiments, as shown in Fig. 1, the backrest of the chair is provided with a back frame 1, a left backrest 2 and a right backrest 3, the back frame 1 is provided with a left support 5 and a right support 5, the left backrest 2 and the right backrest 3 are respectively and independently connected to the left support 5 and the right support 5 through elastic mechanisms 4, the left backrest 2 and the right backrest 3 are respectively and independently connected to the left support 5 and the right support 5 through elastic mechanisms 4, and the left backrest 2 and the right backrest 3 are respectively and independently connected to the left support 5 and the right support 5 through elastic mechanisms 4.

[0065] In some embodiments, as shown in Fig. 1, the backrest of the chair is provided with a back frame 1, a left backrest 2 and a right backrest 3, the back frame 1 is provided with a left support 5 and a right support 5, the left backrest 2 and the right backrest 3 are respectively and independently connected to the left support 5 and the right support 5 through elastic mechanisms 4, the left backrest 2 and the right backrest 3 are respectively and independently connected to the left support 5 and the right support 5 through elastic mechanisms 4, and the left backrest 2 and the right backrest 3 are respectively and independently connected to the left support 5 and the right support 5 through elastic mechanisms 4.

[0066] In addition to the above-mentioned embodiments, the chair back structure of the present application can also adopt other appropriate structures. ​

[0067] In some embodiments, the spinal backrest 8 can be an integral unit, in addition to being composed of a plurality of spinal backrest units, and one or more elastic mechanisms are connected to the back of the unit, as shown in Figure 31 It can be understood that, in addition to five spinal backrest units, in other embodiments, the spinal backrest units can also be other different numbers, such as seven, and the specific number is set by comprehensively considering the number of human spinal blocks, the distribution of each vertebra (such as cervical vertebra, thoracic vertebra, lumbar vertebra, etc.), and the installation complexity, spinal length, curvature, and other factors. The size of each spinal backrest and the spacing between them can be the same or different. For example, as shown in Figure 32 , one spinal backrest unit is arranged at the cervical vertebra, three spinal backrest units are arranged at the thoracic vertebra with a large spacing, two spinal backrest units with different lengths are arranged at the lumbar vertebra, and one spinal backrest unit is arranged at the sacrum and coccyx. The distance between each spinal backrest unit and the chair back can be the same, or by adjusting the length of the spinal elastic member of the spinal backrest unit, the distance between each spinal backrest unit and the chair back, lifting seat or back frame can be different to form different front and back curves to match the human spine curve.

[0068] In some embodiments, as shown in Figure 33 , 34 The spinal backrest 8 includes two or more columns of vertically arranged spinal backrest units, each column is composed of a plurality of spinal backrest units arranged in sequence in the vertical direction, and each spinal backrest unit is connected to the back frame by a spinal elastic member 9 to better fit the spine, form a wrapping effect around the spine, and better transition between the left and right backrests, further simulate different human back shapes, provide a tighter fit, and meet different support needs. Further, gaps are left between the transversely adjacent columns of spinal backrest units to ensure that there is a space between the adjacent columns of spinal backrest units, thereby providing a better fit.

[0069] In some embodiments, the spinal backrest units can also be connected to each other by elastic connecting members 83, and in other embodiments, the spinal backrest units of the spinal backrest can also be connected to the left backrest and / or the right backrest by elastic connecting members, which are elastic sheets, etc., thereby achieving a following fit effect, as shown in Figure 34 .

[0070] In some embodiments, the entire spine backrest 8 can also be mounted on the back frame via a forward and backward adjustable mechanism and a vertical adjustable mechanism. The entire spine backrest can also be connected to a rotating mechanism, allowing it to rotate around a horizontal or vertical axis, or connected to a hinged ball to achieve rotation at any angle, thereby adjusting the spine backrest to different left / right, tilt, or other arbitrary angles. Additionally, in some embodiments, each spine backrest unit can be mounted on the back frame via a separate forward and backward adjustable mechanism, a vertical adjustable mechanism, or a rotating mechanism. By independently adjusting each spine backrest unit, the spine backrest can be adjusted to the desired spinal curve shape. For example, an adjustable seat that can move vertically, forward and backward, or rotate can be provided on the back frame, and then the spinal elastic elements connected to each spine backrest unit can be simultaneously or independently mounted on one or more adjustable seats to achieve adjustment. Similarly, various adjustment mechanisms can be set between the spinal elastic element and the spinal backrest unit. Taking rotation as an example, by leaving space for the connecting part to rotate in the positioning part of the spinal backrest unit, and by making the connecting part and the positioning part adopt a shape suitable for rotation, such as a rectangle, and by setting rotation holes opposite to each other on the connecting part 92 and the spinal backrest unit, the spinal elastic element and each spinal backrest unit are rotatably connected by a rotating rod passing through the rotation hole. Furthermore, a torsion spring is fitted on the rotating rod, and the two ends of the torsion spring act on the spinal backrest and the spinal elastic element respectively, so that the spinal backrest can twist in different directions, such as left and right rotation, tilting rotation, or other arbitrary angle rotation, and has a certain support force, thereby better matching the user's sitting posture and movements. When the user moves, it can rotate better to match the spinal elastic element to follow the user's spine. In addition, these adjustment mechanisms can also add locking mechanisms such as concave-convex fit, interference fit, and locking, so that the spinal backrest or each spinal backrest unit can be fixed or locked at multiple different heights, front-back distances, or rotation angles to better achieve support.

[0071] In some embodiments, the left and right backrests using the connection structure described in this utility model can be a single unit, thereby supporting the entire left and right back of the human body; alternatively, there can be two separate backrests, such as... Figure 1 The upper and lower backrests support the left and right upper back and left and right waist respectively; there can also be three of each, serving as left and right shoulder pillows, left and right upper backrests, and left and right lumbar pillows respectively; there can also be four or more, such as adding left and right neck pillows, for more detailed support; in some embodiments, the spinal backrest may not run through the entire backrest, but may be provided only on one or any combination of the backrests or pillows such as lumbar pillows, back pillows, shoulder pillows, or neck pillows. For example, the spinal backrest may be provided only between the lumbar pillows and back pillows, and the shoulder pillow 40 may not have a spinal backrest. The shoulder pillow is also connected to the headrest 20, such as... Figure 35 As shown.

[0072] The following are some specific operations and usage modes of the chair with the chair back described above, including but not limited to as follows Figure 36 As shown in the figure, the spinal back provides effective support for the spine, the whole back can be adjusted upward and downward to adapt to the height of the user to better support the user's spine, the upper back rotates around one pivot and the lower back rotates around another pivot in the opposite direction, so that the upper back moves backward to provide more powerful support, and the lower back only rotates around one pivot to better wrap the user's waist. In addition, these functional parts can be used alone or in combination to meet the different support needs of the user.

[0073] The utility model also provides a chair structure, which is provided with the chair back structure described above. The chair back structure can be applied to various movable or fixed chairs, thereby meeting the requirement of providing support for the back of the user and achieving the effective effect of the chair back structure described above.

[0074] The above description is only the preferred embodiments of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation, direct / indirect application in other related technical fields based on the utility model description and the attached drawings are included in the patent protection range of the utility model. In the description of the utility model, the description of the reference terms "one embodiment", "some embodiments", "embodiment", "illustrative embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments, and the embodiments of the utility model and the features in the embodiments can be combined.

Claims

1. A chair back structure comprising a left backrest (2) and a right backrest (3) opposite to the left and right sides of the back of a human body, characterized in that: The backrest (8) for supporting the spine of the human body is vertically arranged and opposite to the spine of the human body between the left backrest and the right backrest.

2. The chair back structure of claim 1, wherein: The backrest (8) for supporting the spine of the human body is arranged on the back frame (1) through the spine elastic member (9) with elasticity.

3. The chair back structure of claim 1, wherein: The backrest (8) for supporting the spine of the human body comprises a plurality of spine backrest units arranged vertically in sequence, and each spine backrest unit is connected to the back frame through the spine elastic member (9).

4. The chair back structure of claim 3, wherein: The backrest (8) for supporting the spine of the human body comprises a plurality of spine backrest units arranged vertically in sequence, and each spine backrest unit is connected to the back frame through the spine elastic member (9).

5. A seat back structure according to claim 2, 3 or 4, characterized in that: The spine elastic member (9) is a ring-shaped elastic ring (91), and two ends of the elastic ring are connected to the back frame (1) and the backrest (8) for supporting the spine of the human body, respectively.

6. A seat back structure according to claim 2, 3 or 4, characterized in that: The spine elastic member (9) is a compression spring, and two ends of the compression spring are connected to the backrest (8) for supporting the spine of the human body and the back frame (1), respectively.

7. A backrest structure according to any one of claims 1 to 4, wherein: The back frame (1) comprises a fixedly arranged base (11) and a lifting seat (12) moving up and down relative to the base, and the backrest (8) for supporting the spine of the human body is arranged on the lifting seat.

8. The chair back structure of claim 7, wherein: The back frame (1) comprises a fixedly arranged base (11) and a lifting seat (12) moving up and down relative to the base, and the left backrest (2), the right backrest (3) and the backrest (8) for supporting the spine of the human body are arranged on the lifting seat. The top of the guide groove is a clamping guide part (18) for applying relative moving force to the two positioning blocks and driving the clamping assembly to be clamped and fixed with each other, and the bottom of the guide groove is provided with an unlocking guide block (19) inserted between the two positioning blocks and driving the clamping assembly to be separated from each other.

9. The chair back structure of claim 7, wherein: The base (11) is provided with a toothed rack (111) with tooth opening inclined upward, and a clamping plate (112) provided with clamping teeth (113) matched with the toothed rack. The clamping plate is provided with a clamping plate mounting groove (114) opposite to the bottom of the toothed rack. The bottom of the clamping plate mounting groove is provided with a clamping plate limiting block (115) capable of blocking the bottom of the clamping plate. The clamping plate is arranged in the clamping plate mounting groove and connected with the clamping plate mounting groove through a clamping plate spring (116). The base is provided with an upper pressing block (117) above the toothed rack and a lower pressing block (118) below the toothed rack. The clamping plate mounting groove is provided with a gap (119) above and below for passing through the upper pressing block or the lower pressing block. The upper pressing block passes through the gap and abuts against the top of the clamping plate and presses the bottom of the clamping plate into the inner side of the clamping plate limiting block. The lower pressing block passes through the gap and abuts against the bottom of the clamping plate and pushes the bottom out of the clamping plate limiting block.

10. The seat back structure of any of claims 1-4, wherein: The support (5) is arranged transversely or obliquely. One end of the support is rotatably connected with the left backrest (2) or the right backrest (3) through an elastic mechanism (4), and the other end of the support is rotatably connected with the back frame (1) through another elastic mechanism (4).

11. The chair back structure of claim 10, wherein: The elastic mechanism (4) is a torsion spring. The left backrest (2), the right backrest (3) or the back frame (1) is provided with a connecting seat (6) provided with a recessed seat groove (61). The seat groove is provided with a limiting groove (62). The end of the support (5) is arranged in the seat groove and is hinged with the connecting seat through a rotating shaft (7). The end of the support is further provided with a recessed torsion spring mounting groove (51). The torsion spring is arranged in the torsion spring mounting groove and one end of the torsion spring is arranged in the limiting groove (62).

12. The chair back structure of claim 10, wherein: The left backrest (2), the right backrest (3) and the back frame (1) are provided with connecting seats (6). The upper and lower ends of the connecting seat are oppositely provided with connecting plates (63). The two connecting plates are provided with coaxial through holes. One end of the support (5) is arranged between the two connecting plates. The end of the support is provided with a containing cavity for placing the elastic mechanism (4). The elastic mechanism (4) is a torsion spring. A connecting shaft (65) passes through the two connecting plates and the containing cavity between the two connecting plates in sequence. The torsion spring is sleeved on the connecting shaft. The support and the left backrest, the right backrest and the back frame are provided with torsion spring positioning grooves (60) for placing the end of the torsion spring.

13. The chair back structure of claim 10, wherein: The support (5) is rotatably connected with the connecting seat (6) through the elastic mechanism (4). The left backrest (2) and the right backrest (3) are movably arranged on the connecting seat. The left backrest (2) and the right backrest (3) are provided with vertical lifting through grooves (21). The connecting seat (6) is arranged at the lifting through grooves and is provided with a plurality of lifting positioning holes (57) arranged in vertical direction. The left backrest and the right backrest are provided with movable lifting clamping blocks (22). The lifting clamping blocks are provided with positioning clamping blocks (23) which can be inserted into the lifting positioning holes. The lifting clamping blocks are provided with lifting adjusting springs (24) which push the lifting clamping blocks to the lifting positioning holes.

14. A chair structure, characterized by: A chair back structure as claimed in any one of claims 1-13 is installed.

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