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 present invention relates to furniture, in particular to the structure of a chair backrest. Background Art

[0002] The backrest of a chair is mainly used to support the back of a person. The backrest of a traditional chair is an integrated structure. However, since the back of a person is curved and there are large differences between different individuals, the integrated chair backrest cannot effectively fit closely with the back of the person, resulting in the inability to provide effective and comfortable support. For this reason, some existing ergonomic chairs divide the backrest into two relatively independent left and right parts, thereby improving the fit between the backrest and the back of the person. However, there is a gap between the left and right backrests of this ergonomic chair, which cannot provide special support for the human spine. In addition, the bones and muscles on both sides of the human spine and back are significantly different, and the support requirements are also different. Whether it is a traditional chair or an existing ergonomic chair, it is impossible to provide appropriate support for the spine and back. Summary of the invention

[0003] The object of the present invention is to provide a chair back structure which can provide support for both sides of the back and spine of a human body respectively, and a chair using the chair back, so as to improve the comfort of use.

[0004] The chair back structure described in the present invention includes a left backrest and a right backrest opposite to the left and right sides of the human back, and a spinal backrest arranged between the left backrest and the right backrest to support the human spine. The spinal backrest is arranged vertically and opposite to the human spine; the left backrest, spinal backrest and right backrest are arranged independently.

[0005] The chair structure of the present invention is equipped with the chair back structure as described above.

[0006] The chair back structure and chair structure described in the present invention are divided into three parts: left, middle and right, which correspond to the left side of the human back, the middle spine and the right side of the back respectively. When the user sits on the chair and leans back, the left backrest and the right backrest support the left and right sides of the user's back respectively, and the spine backrest is used solely to support the spine in the middle of the user's back, thereby providing the required support for different parts of the human body, forming a better support effect, and improving the user's comfort.

[0007] Preferably, there is a fixed back frame, and the left backrest and the right backrest are rotatably mounted on the back frame through elastic mechanisms respectively, and the deformation of the elastic mechanisms exerts a force on the left backrest and the right backrest to make them rotate; the spinal backrest is mounted on the back frame through an elastic spinal elastic member.

[0008] Preferably, the spine backrest comprises a plurality of spine backrest units which are arranged in sequence along the vertical direction, and each spine backrest unit is connected to the back frame through a spine elastic member.

[0009] Preferably, the spine backrest comprises a plurality of columns of vertically arranged spine backrest units, wherein each column is composed of a plurality of spine backrest units arranged in sequence along the vertical direction, and each spine backrest unit is connected to the back frame via a spine elastic member.

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

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

[0012] Preferably, the back frame comprises a fixed base and a lifting seat which moves up and down relative to the base, and the spine backrest is installed on the lifting seat.

[0013] Preferably, the back frame includes a fixed base and a lifting base that moves up and down relative to the base, and the left backrest, the right backrest and the spine backrest are all installed on the lifting base; the base is provided with a vertically arranged guide groove, and both sides of the guide groove are provided with a plurality of positioning grooves along the vertical direction, and the positioning grooves are arranged obliquely upward; the lifting base is provided with two laterally oppositely arranged positioning blocks, one end of the two positioning blocks is rotatably installed on the lifting base, and the other ends of the two positioning blocks are clamping parts, and a clamping assembly and a positioning elastic member that are mutually clamped and fixed are respectively provided between the middle parts of the two positioning blocks, and the positioning elastic member applies a force pointing to the positioning groove to the positioning block; the top of the guide groove is a clamping guide part that applies relative movement to the two positioning blocks and drives the clamping assemblies to be mutually clamped and fixed, and the bottom of the guide groove is provided with an unlocking guide block that is inserted between the two positioning blocks and drives the clamping assemblies to disengage from each other.

[0014] Preferably, the base is provided with a rack with teeth inclined upward, and a card plate is provided on the card plate, and teeth cooperating with the rack are provided on the card plate. A card plate mounting groove is provided on the lifting seat opposite to the bottom of the rack, and a card plate limiting block that can block the bottom of the card plate is provided at the bottom of the card plate. The card plate is arranged in the card plate mounting groove and a card plate spring is connected between the card plate mounting groove. The base is respectively provided with an upper pressing block and a lower ejecting block above and below the rack, and notches for passing the upper pressing block or the lower ejecting block are respectively provided above and below the card plate mounting groove. The upper pressing block passes through the notch to abut against the top of the card plate and press the bottom of the card plate into the inner side of the card plate limiting block, and the lower ejecting block passes through the notch to abut against the bottom of the card plate and ejects it out of the card plate limiting block.

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

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

[0017] Preferably, a connecting seat is provided on the left backrest, the right backrest and the back frame, and connecting plates are provided at the upper and lower ends of the connecting seat, and coaxial through holes are opened on 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 receiving cavity for placing an elastic mechanism, and the elastic mechanism is a torsion spring; the connecting shaft passes through the two connecting plates and the receiving cavity therebetween in sequence, the torsion spring is sleeved outside the connecting shaft, and the bracket and the left backrest, the right backrest and the back frame are provided with torsion spring positioning grooves for placing the ends of the torsion spring. Preferably, the bracket is rotatably connected to the connecting seat through an elastic mechanism, and the left backrest and the right backrest can be lifted and lowered on the connecting seat; the left backrest and the right backrest are provided with vertical lifting grooves, the connecting seat is installed at the lifting grooves and has a plurality of lifting positioning holes at vertical intervals, the left backrest and the right backrest are provided with lifting blocks that can move forward and backward, the lifting blocks are provided with positioning blocks that can be inserted into the lifting positioning holes, and lifting adjustment springs are provided between the lifting blocks and the left backrest and the right backrest to push the lifting blocks toward the lifting positioning holes.

[0018] By configuring the chair back and chair structure as described above, the chair back can better fit the human back, further improving the user's comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 , 2 It is a structural schematic diagram of the first embodiment of the chair back structure.

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

[0021] Figure 4-6 It is a schematic diagram of the connection structure between a back frame and a spine backrest.

[0022] Figure 7 It is a structural diagram of another connection method of a back frame and a spinal backrest.

[0023] Figure 8 It is a structural schematic diagram of a spinal backrest with an outer cover.

[0024] Fig. 9 It is a structural schematic diagram of a curved surface spine backrest.

[0025] Fig.10 , 11 It is a schematic diagram of the structure of the back frame.

[0026] Fig.12 This is a schematic diagram of the exploded structure of the back frame.

[0027] Fig.13 It is a schematic diagram of the connection structure between the lifting seat and the positioning block.

[0028] Fig.14 It is a schematic diagram of the connection and lifting adjustment structure of the base and positioning block.

[0029] Fig.15 It is a schematic diagram of the connection structure between the bracket and the backrest.

[0030] Figure 16-18 It is a partial structural diagram of the connection between the bracket and the backrest.

[0031] Fig.19 , 20 It is a structural schematic diagram of the second embodiment of the chair back structure.

[0032] Fig.21 It is a partial structural diagram of the second embodiment.

[0033] Figure 22-24 It is a schematic diagram of the connection structure between the backrest and the bracket of the second embodiment.

[0034] Fig.25 It is a structural schematic diagram of the third embodiment of the chair back structure.

[0035] Fig.26 It is a partial structural diagram of the third embodiment.

[0036] Fig. 27 It is a schematic diagram of the lifting and lowering adjustment status.

[0037] Fig.28 It is a structural schematic diagram of a fourth embodiment of a chair back structure.

[0038] Fig.29 , 30 It is a partial structural diagram of the fourth embodiment.

[0039] Figure 31-35 Schematic diagrams of the structures of five different embodiments.

[0040] Fig.36 It is a schematic diagram of the adjustment status of the chair backrest. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...), then the directional indication is only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "set", "provided with", "connected", and "connected" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] If there are descriptions involving "first" or "second" etc. in the embodiments of the present invention, the descriptions of "first" or "second" etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, "several" means more than one, "many" means more than two, and "above", "below", "within", etc. are all understood to include the number. In addition, the technical features of each embodiment can be arbitrarily combined. In order to make the description concise, not all possible combinations of the technical features in the embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0045] The invention provides a chair back structure.

[0046] Embodiment 1, as Figure 1-18 shown.

[0047] The chair back structure of this embodiment includes a left backrest 2 and a right backrest 3 opposite to the left and right sides of the human back, and a spinal backrest 8 arranged between the left backrest and the right backrest, and the spinal backrest is arranged vertically and opposite to the human spine; the left backrest, spinal backrest and right backrest are arranged independently.

[0048] like Figure 1 , 2As shown, the chair back is divided into three parts: left, middle and right, which correspond to the left side of the human back, the middle spine and the right side of the back respectively. When the user sits on the chair and leans back, the left backrest and the right backrest support the left and right sides of the user's back respectively, and the spine backrest specifically supports the spine in the middle of the user's back, thereby providing the required support for different parts of the human body, forming a better support effect, and improving the user's comfort.

[0049] The chair back structure has a fixed back frame 1, and the left backrest 2 and the right backrest 3 are rotatably mounted on the back frame through elastic mechanisms 4. The deformation of the elastic mechanisms exerts a force on the left and right backrests to make them rotate. The spine backrest 8 is mounted on the back frame through an elastic spine elastic member 9. With this structure, the left and right backrests will have a tendency to rotate when they are compressed. The elastic mechanism will deform and generate a rebound force during the rotation of the left and right backrests. This force will drive the left and right backrests to rotate in the opposite direction. The rotation direction may be Figure 3 The counterclockwise or clockwise rotation of the middle left backrest creates an effect similar to hugging or opening the backrest to the user; at the same time, the spine backrest can be pressed against the human spine under the action of the spine elastic member, allowing the spine backrest to adjust adaptively relative to the human spine under stress. The spine backrest is independently set up with the left and right backrests. Compared with the structure in which the spine backrest is not independently set up with the left and right backrests, the independent setting makes the spine backrest less affected by the rotation of the left or right backrest, and allows the spine backrest to have room for movement, so that by cooperating with the left and right backrests, it can fit the curve of the entire back more closely, better provide support for the user, and further improve the comfort of use.

[0050] The backrest structure of the chair includes at least one row of a plurality of backrest units arranged in sequence along the vertical direction. Furthermore, there is a gap between the vertically adjacent backrest units. Figure 1 , Figure 4As shown, each spinal backrest unit is connected to the back frame through a spinal elastic member 9; this is because when the user sits on the chair, the human spine is not vertical but curved, and the human spine is composed of multiple vertebrae. For example, an adult generally has 26 vertebrae, and there are gaps between each vertebra. Therefore, the arrangement of multiple spinal backrest units can not only correspond to different positions of the spine respectively, but also better adapt to the human spinal curve, provide more suitable support, and improve the comfort of use. In addition, compared with no gaps between multiple spinal backrest units or multiple spinal backrest units that are not independent of each other, the design of multiple independent spinal backrest units can also allow each independent spinal backrest unit to be independently stressed. At the same time, there are gaps between vertically adjacent spinal backrest units to avoid the stress on one spinal backrest unit affecting another spinal backrest unit, and each spinal backrest unit can also leave a certain amount of activity space to ensure that the spinal backrest fits the spine better. In addition, each spinal backrest unit can be connected to only one spinal elastic member 9. In some other embodiments, more than two spinal elastic members can be installed as needed (for example, if some spinal backrest units are longer, one spinal backrest unit may require more than two elastic members to be supported). These multiple spinal elastic members are arranged in parallel horizontally or vertically to form multiple columns, multiple rows and other different support forms.

[0051] like Figure 4-9 As shown, the spine elastic member 9 is an annular elastic ring 91, and the two ends of the elastic ring are respectively connected to the back frame 1 and the spine backrest 8. When the elastic ring is compressed, it will produce elastic deformation, thereby pushing the spine backrest toward the user's back, further allowing the spine backrest to fit the curve of the spine and more adaptively support the spine; and the two ends of the elastic ring 91 are respectively provided with connecting parts 92 connecting the back frame 1 and the spine backrest 8, as shown in FIG. Figure 5 , 6 As shown, latch holes 86 are arranged on the connecting portion 92 and the spinal backrest 8 in a relative manner, and the elastic ring and the spinal backrest unit of the spinal backrest are connected and fixed by means of the latch 600 passing through the latch hole 86. Concave and convex friction patterns are arranged on one end or both ends of the latch to improve the connection strength and prevent the latch from falling off. At the same time, the spinal backrest 8 and the back frame 1 are provided with positioning portions 85 adapted to the shape of the connecting portion 92, such as concave, convex, rectangular or trapezoidal shapes, so as to perform positioning and improve the convenience of installation. At the same time, it also plays a limiting role to prevent the spinal backrest from rotating improperly during use and improve the supporting force of the spinal backrest. In addition, in some other embodiments, other connection methods can be adopted between the spinal backrest unit of the spinal backrest 8 and the spinal elastic member and the back frame 1, such as Figure 7As shown, a screw hole 921 can be provided on the connecting portion, and the connecting portion and the positioning portion can be in various shapes such as concave, convex, rectangular or trapezoidal to facilitate positioning, installation and limiting. In addition, a bolt 500 passing through the back frame 1 or the spinal backrest 8 is screwed to the screw hole to connect and fix, so that the spinal backrest unit of the spinal backrest 8 has sufficient supporting force.

[0052] like Figure 5-8 As shown, the spinal backrest unit of the spinal backrest 8 includes a fixing plate 81 connected to the spinal elastic member, and a panel 82 detachably connected to the fixing plate. The fixing plate and the panel are snap-fitted, screwed or connected in other commonly used backrest connection methods, so that an outer set 84 such as mesh, leather, leather, rubber, cloth, airbag cloth, etc. can be installed on the spinal backrest unit. Further, the outer set can also be filled with sponge, latex, sponge-latex mixture, cotton, gas, plastic, etc. fillers, such as Figure 8 , so that the spine backrest is softer and more comfortable. In addition, the outer set and the filler can be installed or connected to the spine backrest unit by referring to some other existing backrest mesh or connection technologies, and the same is true for the left and right backrests. In other embodiments, the spine backrest unit can be not only straight, but also the entire unit of each spine backrest can be curved, or the surface of each spine backrest unit can be curved, such as Fig. 9 , so as to better adapt to the spine curve. Similarly, the fillers and outer sets provided in each spine backrest unit can be flat, such as Figure 8 , it can also be set to a certain curvature, such as using some shaping cotton to create a curvature, to achieve a similar Fig. 9 The arc shape better fits the curve of the spine.

[0053] The chair back structure described, the back frame 1 includes a fixed base 11, and a lifting base 12 that moves up and down relative to the base, the left backrest 2, the right backrest 3 and the spine backrest 8 are all installed on the lifting base; the base is provided with a vertically arranged guide groove, and both sides of the guide groove are provided with a plurality of positioning grooves 13 along the vertical direction, and the positioning grooves are arranged obliquely upward; the lifting base is provided with two laterally oppositely arranged positioning blocks 14, one end of the two positioning blocks is rotatably installed on the lifting base, the other end of the two positioning blocks is a clamping part 15, and the middle parts of the two positioning blocks are respectively provided with a clamping assembly 16 and a positioning elastic member 17 that are fixed to each other, and the positioning elastic member applies a force pointing to the positioning groove to the positioning block; the top of the guide groove is a clamping guide part 18 that applies relative movement to the two positioning blocks and drives the clamping assemblies to be fixed to each other, and the bottom of the guide groove is provided with an unlocking guide block 19 that is inserted between the two positioning blocks and drives the clamping assemblies to disengage from each other. Figure 10-14As shown, the two positioning blocks can be clamped in the positioning grooves under the action of the positioning elastic member, and because the positioning grooves are arranged to be inclined upward, the lifting seat and the left backrest, the right backrest and the spine backrest thereon are fixed at a specific height to meet the use needs of people of different physiques; when the user needs to adjust the height of the backrest upward, the lifting seat is pulled upward to drive the positioning blocks to move to the positioning grooves above; Fig.14 As shown, when the height needs to be adjusted downward, the lifting seat drives the positioning block to move to the clamping guide part, and the two positioning blocks are acted upon by the clamping guide part and move relative to each other until the clamping assembly between the two positioning blocks is fixed to each other, so that the two positioning blocks can no longer be re-opened into the positioning groove. At this time, the lifting seat is driven to descend to the bottom of the guide groove, and the clamping assembly is unlocked by unlocking the guide block. The two positioning blocks are re-opened under the action of the positioning elastic member, and then the user can adjust the lifting seat and the backrest to the required height according to the above method. The adjustment structure of this backrest is simple and compact, and can be easily set and installed. It is simple and convenient to use, and can stably position the backrest at the required height. The positioning elastic member 17 can be a compression spring, an elastic ring, or an elastic device such as an elastic sheet. In addition, the clamping assembly 16 includes a clamping slot portion and a clamping block portion respectively arranged on the two positioning blocks 14, and the clamping slot portion is provided with an inwardly concave clamping slot, and the end of the clamping block portion can be inserted and fixed in the clamping slot, so as to facilitate clamping and fixing. In addition, a lifting limit groove 101 is provided on the base 11, and a lifting limit plate 102 that can be lifted is also installed on the base. A lifting limit member 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 shaking back and forth during the lifting process. Two vertically arranged guide bars 10 are arranged in parallel on the base 11, and the lifting limit plate 102 and the middle part of the lifting seat 12 are both arranged between the two guide bars, so that the lifting seat is limited and guided in the horizontal direction by the guide bars, thereby preventing the lifting seat from shaking left and right during the lifting process.

[0054] The chair back structure described has a bracket 5 arranged horizontally or obliquely, one end of the bracket is rotatably connected to the left backrest 2 or the right backrest 3 via an elastic mechanism 4, the elastic mechanism 4 is arranged between the bracket and the left backrest or the right backrest, and the middle part of the left backrest 2 or the right backrest 3 is connected to the end of the bracket 5, so that the left and right backrests can be rotated more smoothly in two different directions, and thus fit the user's back tightly. Furthermore, the other end of the bracket 5 is also rotatably connected to the back frame 1 via the elastic mechanism 4, thereby forming two elastic rotation mechanisms. In addition to being able to achieve the effect of rotational fitting like one elastic rotation mechanism, the two elastic rotation mechanisms can also further produce a front-to-back support effect of allowing the left and right backrests to move horizontally backward or forward by rotating one in the positive direction and the other in the reverse direction, thereby increasing the adjustment range of the backrest, better supporting, following and fitting the user's back, and further avoiding excessive force on the local position of the back of the human body during leaning, further improving comfort. Figure 15-18 As shown, the elastic mechanism 4 is a torsion spring, which has a simple structure and stable operation. Of course, the elastic mechanism can also be any other device with elastic function, such as a tension spring, a compression spring, a gas spring, an elastic sheet, a leaf spring, etc., and different springs or elastic sheets can be installed on both sides of the hinged end of the backrest to drive the backrest to rotate. In some other embodiments, an elastic rotation mechanism can be set only between the bracket and the left backrest or the right backrest, or only between the bracket and the back frame 1, so as to realize the requirement of only rotation; or more than three elastic rotation mechanisms can be set, and through the setting of multiple hinged ends, a larger adjustment range and adjustment state can be formed, which can further follow and fit the back of the supporting human body, thereby improving comfort.

[0055] like Fig.16 As shown, the back frame 1 is provided with a connecting seat 6, which can be connected to the back frame in one piece or detachably, and the connecting seat is provided with a recessed seat groove 61, and a limiting groove 62 is provided in the seat groove. The end of the bracket 5 is arranged in the seat groove and is hinged to the connecting seat through a rotating shaft 7. The end of the bracket is also provided with a recessed torsion spring installation groove 51, and the torsion spring is installed in the torsion spring installation groove and one end of the torsion spring is arranged in the limiting groove 62. Further, the back of the left backrest 2 and the right backrest 3 is also provided with a connecting seat 6 which is integral with the left and right backrests or detachably connected to the left and right backrests, as shown in FIG. Fig.17 , 18, a recessed seat groove 61 is provided on the connecting seat 6 and a limiting groove 62 is provided in the seat groove, the end of the bracket 5 is arranged in the seat groove and is hinged to the connecting seat through the rotating shaft 7, and the end of the bracket is also provided with a recessed torsion spring installation groove 51, the torsion spring is installed in the torsion spring installation groove and one end thereof is arranged in the limiting groove 62 of the seat groove. This structure can ensure the stability of the rotation of the backrest, so as to fit the back of the human body more accurately and improve the comfort of use. Furthermore, the rotating shaft 7 can be covered with a rubber sleeve or a plastic tube to reduce the sound generated during rotation. Obviously, in some other embodiments, if the elastic mechanism is not a torsion spring, other elastic mechanisms can refer to the connection.

[0056] In addition, in some other embodiments, the connection seat 6 and the left backrest 2 and the right backrest 3 can be relatively raised and lowered to adjust the backrest to a suitable height to meet the user's needs; or, the connection seat 6 can also be installed on the back frame 1 in a liftable manner. Of course, a locking mechanism can be partially or fully provided in one or more of the connection seats 6 or the elastic mechanism 4, so that the backrest can be locked at multiple different angles during the rotation process. In addition, a buffer mechanism can be provided between the connection seat 6 and the left backrest and the right backrest, such as a plurality of springs or elastic soft rubber, to reduce vibration when the backrest rotates.

[0057] Embodiment 2, as Figure 19-24 shown.

[0058] In the chair back structure of this embodiment, the spinal elastic member 9 is a compression spring, and the two ends of the compression spring are respectively connected to the spinal backrest 8 and the back frame 1; specifically, mounting columns or mounting grooves can be provided on the back frame 1 and the spinal backrest 8, and the two ends of the compression spring are fixed to the mounting columns or mounting grooves. Of course, in some other embodiments, the spinal elastic member 9 can also be an elastic device or an electric device such as a gas spring or a hydraulic spring, and it is only necessary to apply a force directed toward the user to the spinal backrest.

[0059] The left backrest 2, the right backrest 3, and the back frame 1 are provided with a connecting seat 6, and the upper and lower ends of the connecting seat are provided with connecting plates 63, and the two connecting plates are provided with coaxial through holes; one end of the bracket 5 is arranged between the two connecting plates, and the end of the bracket is provided with a receiving cavity for placing the elastic mechanism 4, and the elastic mechanism 4 is a torsion spring; the connecting shaft 65 passes through the two connecting plates and the receiving cavity therebetween in sequence, and the torsion spring is sleeved outside the connecting shaft, and the bracket and the left backrest, the right backrest, and the back frame are provided with a torsion spring positioning groove 60 for placing the end of the torsion spring, and the torsion spring drives the backrest to rotate relative to the bracket, or drives the bracket to rotate relative to the back frame, so that the backrest is close to the user's back. This structure is not easy to deviate during the rotation process and is more stable. Furthermore, a rubber tube or plastic sleeve 651 is sleeved on the connecting shaft 65, and the torsion spring is sleeved on the rubber tube or plastic sleeve to reduce the sound during the rotation process. The torsion spring positioning grooves arranged on the back frame, the bracket, the left backrest and the right backrest can be either strip grooves similar to the ends of the torsion springs or cavities abutting against the ends of the torsion springs.

[0060] Between the left backrest 2, the right backrest 3 and the bracket 5, and between the bracket 5 and the back frame 1, a turning limit block 54 and a turning limit groove 69 are provided along the circumferential direction to limit the excessive rotation of the left and right backrests. Obviously, in some other embodiments, these limit structures may not be provided to allow a larger or freer rotation range. In addition, decorative covers 632 may be added at both ends of the through hole of the connecting plate.

[0061] Embodiment three, as Figure 25-27 shown.

[0062] The backrest structure of this embodiment is that the back frame 1 includes a fixed base 11 and a lifting seat 12 that moves up and down relative to the base, and the left backrest 2, the right backrest 3 and the spine backrest 8 are all installed on the lifting seat; at the same time, the back frame 1 includes a fixed base 11 and a lifting seat 12 that moves up and down relative to the base, and the left backrest 2 and the right backrest 3 are all installed on the lifting seat; at the same time, the base 11 is provided with a rack 111 with a tooth opening inclined upward, and a clamping plate 112 is provided on the clamping plate, and a clamping tooth 113 that cooperates with the rack is provided on the lifting seat at a position opposite to the bottom of the rack. The cardboard mounting groove 114, the bottom of the cardboard mounting groove is provided with a cardboard limiting block 115 that can block the bottom of the cardboard, the cardboard is set in the cardboard mounting groove and a cardboard spring 116 is connected to the cardboard mounting groove, the base is located above and below the rack and is respectively provided with an upper pressure block 117 and a lower ejector block 118, and the upper and lower parts of the cardboard mounting groove 114 are respectively provided with notches 119 for the upper pressure block or the lower ejector block to pass through, the upper pressure block passes through the notch and abuts against the top of the cardboard and presses the bottom of the cardboard into the inner side of the cardboard limiting block, and the lower ejector block passes through the notch and abuts against the bottom of the cardboard and ejects it out of the cardboard limiting block. Furthermore, notches 119 may also be provided at the upper and lower ends of the lifting seat 12 to facilitate the passage of the upper pressure block or the lower ejector block; Figure 25-27As shown, the rack, the card plate, and the card plate mounting groove are arranged relatively in the horizontal direction. When positioned at a certain height, the card plate is located in the card plate mounting groove, and the clamping teeth protrude from the card plate mounting groove and clamp each other with the teeth recessed on the rack; when the backrest needs to be raised, the lifting seat is pulled upward; and when the backrest needs to be lowered, the lifting seat is pulled to the highest position, so that the top of the card plate is against the upper pressure block, thereby applying a downward force to the card plate and causing the bottom of the card plate to retract into the inner side of the card plate limit block, at which time the clamping teeth will be separated from the rack, and the lifting seat is lowered to the bottom under the action of gravity, or the lifting seat is pulled downward to the bottom, so that the bottom of the card plate passes through the notch and is against the lower top block, so that the card plate is separated from the card plate limit block, and then the backrest can be adjusted upward to the desired height. Further, the top of the card plate 112 is an arc, which prevents the card plate from getting stuck in the swinging process of the card plate mounting groove during the lifting process of the backrest, thereby making it smoother. Similarly, the base 11 and the lifting seat 12 can also be matched with vertically arranged guide components, such as guide bars, lifting limit plates, limit grooves and limit members, to improve the accuracy of lifting and adjustment.

[0063] Embodiment 4, as Figure 28-30 shown.

[0064] As in the chair backrest of the present embodiment, the left and right backrests are independently and liftably mounted on the brackets 5, the brackets 5 are rotatably connected to the connecting seat 6 through the elastic mechanism 4, and the left backrest 2 and the right backrest 3 are liftably mounted on the connecting seat, thereby forming more adjustment states to meet different usage needs. Specifically, a vertical lifting groove 21 can be provided on the left backrest 2 and the right backrest 3, the connecting seat 6 is installed at the lifting groove and a plurality of lifting positioning holes 57 are provided along the vertical intervals, and in order to achieve the lifting and locking, the left backrest and the right backrest can be equipped with a lifting block 22 that can move forward and backward, the lifting block is provided with a positioning block 23 that can be inserted into the lifting positioning hole, and a lifting adjustment spring 24 that pushes the lifting block to the lifting positioning hole is installed between the lifting block and the left backrest and the right backrest, thereby forming positioning, and when adjustment is needed, the lifting block can be pressed and separated from the lifting positioning hole, and the operation is convenient and quick, and the left and right backrests can be well realized to independently lift and adjust and lock. The connecting seat 6 can be installed on the lifting groove 21 through the clamping block 25. The left backrest 2 and the right backrest 3 are also provided with a placement cavity 26 for placing the lifting block 22 so as to install the lifting block.

[0065] In some other embodiments, the other end of each bracket 5 can also be installed on the back frame 1 through one or more lifting seats in a liftable manner, so as to achieve independent or simultaneous lifting adjustment and locking of the left and right backrests.

[0066] In addition to the implementations of the above embodiments, the chair back structure described in the present invention may also adopt other appropriate structures.

[0067] In some embodiments, the spine backrest 8 may be composed of a plurality of spine backrest units, or may be a whole, with one or more elastic mechanisms connected to the back, such as Fig.31 As shown. 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, etc., and the specific number is set by comprehensively considering the number of human spine bones, the distribution of each vertebra (such as cervical vertebrae, thoracic vertebrae, lumbar vertebrae, etc.), and the installation complexity, spine length, curvature and other factors. The size of each spinal backrest and the spacing between them can be the same or different. For example, Fig.32 A spinal backrest unit is arranged at the cervical vertebrae, three spinal backrest units are arranged at a larger distance at the thoracic vertebrae, two spinal backrest units, one long and one short, are arranged at the lumbar vertebrae, 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 the length of the spinal elastic member of the spinal backrest unit can be adjusted to make the distance between each spinal backrest unit and the chair back, lifting seat or back frame different, so as to present different front and back curves to match the human spine curve.

[0068] In some embodiments, Fig.33 , 34 As shown, the spine backrest 8 includes more than two rows of vertically arranged spine backrest units, wherein each row is composed of a plurality of spine backrest units arranged in sequence along the vertical direction, and each spine backrest unit is connected to the back frame through a spine elastic member 9, so as to better fit the spine, form a wrapping feeling of the spine, and better transition the left and right backrests, further simulate different human back shapes, provide a tighter fit, and meet different support requirements. Furthermore, there is a gap between the adjacent rows of spine backrest units in the horizontal direction, so as to ensure that there is space for movement between the adjacent rows of spine backrest units, so as to fit more closely.

[0069] In some embodiments, each spinal backrest unit can also be connected to each other through an elastic connector 83. In other embodiments, each spinal backrest unit of the spinal backrest can also be connected to the left backrest and / or the right backrest through an elastic connector, and the elastic connector is an elastic sheet, etc., so as to achieve a tracking fit effect. Fig.34 .

[0070] In some embodiments, the entire spine backrest 8 can also be installed on the back frame through a front-to-back adjustment mechanism that can move forward and backward and a lifting adjustment mechanism that can move up and down. The entire spine backrest can also be connected with a rotating mechanism so that the spine backrest can rotate around a horizontal or vertical axis, or connected with a hinge ball to achieve rotation at any angle, so as to adjust the spine backrest to different left and right, pitch or other arbitrary angles; in addition, in some embodiments, each spine backrest unit can also be installed on the back frame through a separate front-to-back adjustment mechanism, lifting adjustment mechanism, and rotating mechanism, and the spine backrest can be adjusted to the desired spinal curve shape by independently adjusting each spine backrest unit. For example, an adjustment seat that can move up and down, move forward and backward, or rotate is set on the back frame, and then the spinal elastic members connected to each spinal backrest unit are simultaneously or independently installed on one or more adjustment seats to achieve adjustment. Similarly, various adjustment mechanisms in various directions can also be set between the spinal elastic member and the spinal backrest unit. Taking rotation as an example, by leaving space for the connection part to rotate in the positioning part of the spinal backrest unit, and making the connection part and the positioning part adopt a shape suitable for rotation such as a rectangle, a rotation hole is relatively set on the connection part 92 and the spinal backrest unit, and the spinal elastic member and each spinal backrest unit are rotatably connected by a rotation rod passing through the rotation hole. Furthermore, a torsion spring is sleeved on the rotation rod, and the two ends of the torsion spring act on the spinal backrest and the spinal elastic member respectively, so that the spinal backrest can be twisted in different directions, such as left and right rotation, pitch rotation or other arbitrary angle rotation, and has a certain supporting force, so as to better match the user's sitting posture and movement. When the user is active, it can be better rotated to match the spinal elastic member to follow the user's spine. In addition, these adjustment mechanisms can also add locking mechanisms such as concave-convex fit, interference fit, and latch, so that the spinal backrest or each spinal backrest unit can be fixed or latched at multiple different heights, front and back distances or rotation angles to better achieve support.

[0071] In some embodiments, the left and right backrests using the connection structure of the present invention can be one, thereby supporting the entire left and right backs of the human body; or they can be two, such as Figure 1 The upper backrest and the lower backrest support the left and right upper backs and the left and right waists respectively; there may also be three, respectively, as the left and right shoulder pillows, the left and right upper backrests and the left and right lumbar pillows; there may also be more than four, such as adding left and right neck pillows, etc., to provide more detailed support; in some embodiments, the spinal backrest may not run through the entire backrest, but only be provided on one of the backrests or pillows of the waist pillow, back pillow, shoulder pillow or neck pillow, or any combination of the backrests or pillows. For example, a spinal backrest is provided only between the waist pillow and the back pillow, and a spinal backrest is not provided on the shoulder pillow 40, and a headrest 20 is also connected to the shoulder pillow, such as Fig.35 shown.

[0072] Taking the chair with the chair back as an example, some specific operations and usages are listed below, including but not limited to: Fig.36 As shown, the spine backrest provides effective support for the spine. The entire backrest can be adjusted upward to adapt to the height of the user to better support the user's spine. The upper backrest rotates on one axis and the other axis rotates in the opposite direction, so that the upper backrest moves backward to provide stronger support. The lower backrest only rotates on one axis 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 users.

[0073] The present invention also provides a chair structure equipped with the chair back structure as described above, so that it can be applied to various movable or fixed chairs, thereby providing support for the user's back and achieving the effective effect of the chair back structure as described above.

[0074] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention. In the description of the present invention, the description of reference terms such as "one embodiment", "some embodiments", "embodiment", "illustrative embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation 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, in the absence of conflict, the embodiments described herein can be combined with other embodiments, and the embodiments of the present invention and the features in the embodiments can be combined with each other.

Claims

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

2. The chair back structure according to claim 1, characterized in that: A fixed back frame (1) is provided, and a left backrest (2) and a right backrest (3) are rotatably mounted on the back frame via elastic mechanisms (4), respectively, and deformation of the elastic mechanisms exerts a force on the left backrest and the right backrest to cause them to rotate; the spinal backrest (8) is mounted on the back frame via an elastic spinal elastic member (9).

3. The chair back structure according to claim 1, characterized in that: The spine backrest (8) comprises a plurality of spine backrest units arranged in sequence along the vertical direction, and each spine backrest unit is connected to the back frame via a spine elastic member (9).

4. The chair back structure according to claim 3, characterized in that: The spine backrest (8) comprises a plurality of columns of vertically arranged spine backrest units, wherein each column is composed of a plurality of spine backrest units arranged in sequence along the vertical direction, and each spine backrest unit is connected to the back frame via a spine elastic member (9).

5. The chair back structure according to claim 2, 3 or 4, characterized in that: The spine elastic member (9) is an annular elastic ring (91), and two ends of the elastic ring are respectively connected to the back frame (1) and the spine backrest (8).

6. The chair 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 respectively connected to the spine backrest (8) and the back frame (1).

7. The chair back structure according to any one of claims 1 to 4, characterized in that: The back frame (1) comprises a fixed base (11) and a lifting seat (12) that moves up and down relative to the base, and a spinal backrest (8) is mounted on the lifting seat.

8. The chair back structure according to claim 7, characterized in that: The back frame (1) comprises a fixed base (11) and a lifting base (12) movable up and down relative to the base, and a left backrest (2), a right backrest (3) and a spine backrest (8) are all mounted on the lifting base; the base is provided with a vertically arranged guide groove, and both sides of the guide groove are provided with a plurality of positioning grooves (13) in the vertical direction, and the positioning grooves are arranged obliquely upward; the lifting base is provided with two laterally oppositely arranged positioning blocks (14), one end of the two positioning blocks is rotatably mounted on the lifting base, the other ends of the two positioning blocks are clamping parts (15), and a clamping assembly (16) and a positioning elastic member (17) which are mutually clamped and fixed are respectively arranged between the middle parts of the two positioning blocks, and the positioning elastic member applies a force pointing to the positioning groove to the positioning block; the top of the guide groove is a clamping guide part (18) which applies relative movement to the two positioning blocks and drives the clamping assembly to be mutually clamped and fixed, and the bottom of the guide groove is provided with an unlocking guide block (19) which is inserted between the two positioning blocks and drives the clamping assembly to be separated from each other.

9. The chair back structure according to claim 7, characterized in that: The base (11) is provided with a rack (111) with a tooth opening inclined upward, and a card plate (112) is provided on the card plate. A card plate installation groove (114) is provided on the lifting seat at a position opposite to the bottom of the rack. A card plate limiting block (115) capable of blocking the bottom of the card plate is provided at the bottom of the card plate. The card plate is arranged in the card plate installation groove and a card plate spring (116) is connected between the card plate installation groove. An upper pressing block (117) and a lower ejecting block (118) are provided above and below the rack, respectively. A notch (119) for passing the upper pressing block or the lower ejecting block is provided above and below the card plate installation groove, respectively. The upper pressing block passes through the notch to abut against the top of the card plate and presses the bottom of the card plate into the inner side of the card plate limiting block. The lower ejecting block passes through the notch to abut against the bottom of the card plate and ejects it out of the card plate limiting block.

10. The chair back structure according to any one of claims 1 to 4, characterized in that: A bracket (5) is arranged horizontally or obliquely, one end of the bracket is rotatably connected to the left backrest (2) or the right backrest (3) via an elastic mechanism (4), and the other end of the bracket is rotatably connected to the back frame (1) via another elastic mechanism (4).

11. The chair back structure according to claim 10, characterized in that: The elastic mechanism (4) is a torsion spring; a connecting seat (6) is provided on the left backrest (2), the right backrest (3) or the back frame (1); a recessed seat groove (61) is provided on the connecting seat; a limiting groove (62) is provided in the seat groove; an end of the bracket (5) is arranged in the seat groove and is hinged to the connecting seat via a rotating shaft (7); a recessed torsion spring installation groove (51) is also provided at the end of the bracket; the torsion spring is installed in the torsion spring installation groove and one end of the torsion spring is arranged in the limiting groove (62).

12. The chair back structure according to claim 10, characterized in that: A connecting seat (6) is provided on the left backrest (2), the right backrest (3) and the back frame (1); connecting plates (63) are provided at the upper and lower ends of the connecting seat, and coaxial through holes are provided on the two connecting plates; one end of the bracket (5) is arranged between the two connecting plates, and an accommodating cavity for accommodating an elastic mechanism (4) is provided at the end of the bracket; the elastic mechanism (4) is a torsion spring; a connecting shaft (65) passes through the two connecting plates and the accommodating cavity therebetween in sequence, the torsion spring is sleeved outside the connecting shaft, and a torsion spring positioning groove (60) for accommodating the end of the torsion spring is provided on the bracket and the left backrest, the right backrest and the back frame.

13. The chair back structure according to claim 10, characterized in that: The bracket (5) is rotatably connected to a connecting seat (6) via an elastic mechanism (4); a left backrest (2) and a right backrest (3) are mounted on the connecting seat in a liftable manner; the left backrest (2) and the right backrest (3) are provided with vertical lifting grooves (21); the connecting seat (6) is mounted on the lifting grooves and is provided with a plurality of lifting positioning holes (57) at intervals along the vertical direction; a lifting block (22) movable forward and backward is mounted on the left backrest and the right backrest; a positioning block (23) insertable into the lifting positioning hole is mounted on the lifting block; and a lifting adjustment spring (24) for pushing the lifting block toward the lifting positioning hole is mounted between the lifting block and the left backrest and the right backrest.

14. A chair structure, characterized in that: A chair back structure according to any one of claims 1 to 13 is provided.

Images