A chair back and seat based on ergonomics

Abstract

The invention discloses an ergonomic chair back, comprising a back support, on which is provided: an upper back assembly, comprising two side back units and an elastic block; a support arm is provided on the back support; a single support arm is connected to the outer side of the side back unit, and an elastic soft ring is provided between the support arm and the side back unit; the elastic block is an elastic rubber body, so that the two side back units can be elastically contracted or expanded along the front-back direction; a lumbar support member is arranged below the upper back assembly; the lumbar support member is elastic and arches forward in the middle position, and the lumbar support member comprises a lumbar support frame and two side lumbar support bodies arranged side by side, so that the lumbar support member is more likely to be elastically deformed; the lumbar support member is connected to the lumbar support member, and a sliding seat that can be slid up and down and adjusted is provided at the lower part of the lumbar support member, and the lower end of the lumbar support member is rotatably connected to the sliding seat; the lumbar support member can respond to the lifting and lowering movement of the sliding seat and correspondingly undergo elastic deformation in the longitudinal direction to change its own forward arch degree.

Description

Technical Field

[0001] The invention relates to the field of seating, and in particular to an ergonomic chair back and a seat. Background Art

[0002] The backrests of office chairs on the market are generally a large integral frame structure (i.e., a single-back chair), which is too large and heavy. A large injection molding machine is required for production, and the packaging and transportation costs are high. In addition, the defects of single-back chairs are: they cannot match the user's spine shape to fit and support the user's back and waist, and cannot provide targeted support; people sit on single-back chairs for a long time, and their spines are squeezed for a long time without rest; or the waist is suspended and loses support, which causes spinal lesions due to poor sitting posture; therefore, in the prior art, in order to make the chairs more comfortable to use, more and more manufacturers have designed various double-back and triple-back chairs; this type of chair is equipped with multiple backrests to better support the human back in different areas, and the single backrest also has adjustment functions such as lifting and lowering, and lateral movement; this type of chair is designed based on ergonomics and is also called ergonomic chairs.

[0003] The so-called ergonomics, in essence, is to make the use of tools as suitable as possible for the natural form of the human body, so that the person using the tool does not need to actively adapt physically and mentally when working, thereby minimizing the fatigue caused by the use of tools. Although some existing ergonomic chairs are equipped with multiple backrests, the backrests are usually directly fixed to the support frame, which is not very comfortable and is always in a fixed state; the backrest cannot change with the human body when leaning back; as a result, the human body will be subject to the reaction force of the backrest during the process of leaning back, and cannot stretch out well; the backrest can only simply play the role of supporting the back. Moreover, the sitting posture of a person is not fixed. For example, when leaning forward to write at a desk or browsing the web with eyes level, the state of the human back is different, and the sitting posture changes dynamically; some chairs simply divide the backrest into upper back and lower back, but the single upper back and lower back cannot deform accordingly with the user's body twisting, and cannot meet the use requirements of different sitting postures; as a result, one side of the user's back will be away from the backrest and lose support, and the effect of partitioned support cannot be achieved.

[0004] The Chinese invention patent CN201710214545.6 discloses "an intelligent healthy chair ergonomic backrest", including a headrest, a backrest and a waistrest respectively arranged on the backrest support, the waistrest includes a left waistrest and a right waistrest arranged in parallel and a corresponding left waistrest adjustment device and a right waistrest adjustment device, the left waistrest and the right waistrest are respectively fixed on the left waistrest adjustment device and the right waistrest adjustment device, the left waistrest adjustment device and the right waistrest adjustment device are arranged on the backrest support, the headrest, the backrest, the left waistrest and the right waistrest each have an independent leaning curved surface for the user to lean on. The left waistrest adjustment device and the right waistrest adjustment device are adaptive elastic devices. They can automatically adjust the waistrest state according to different body contours and back curve shapes to meet the different needs of different people for comfort and health. At the same time, they can correct bad sitting postures.

[0005] The above-mentioned ergonomic chair back is divided into a back support, a left lumbar support and a right lumbar support; however, the back support can only support the upper back of the human body and cannot deform accordingly with the user's body twisting, resulting in one side of the upper back moving away from the chair back and losing support when the user actually uses it. Although the chair back has a left lumbar support and a right lumbar support to provide zoned support for the user's waist, it is well known that the human spine is S-shaped, and the lumbar supports of most chairs protrude forward to support the natural curvature of the lumbar spine, playing a role in supporting the waist; while the chair back obviously has no obvious effect in supporting the waist; and the left lumbar support and the right lumbar support cannot be adjusted in depth forward and backward. Since people's body shapes are diverse, the lumbar support in a fixed position is difficult to adapt to people of different body shapes, and the lumbar support cannot be adjusted in depth forward and backward to meet individual differences, so its scope of application and health care effects are limited.

[0006] Therefore, the present invention is committed to designing an ergonomic chair back with an ergonomic curved chair back support that can provide partitioned support for the user's back and can also adjust the front and back depth of the user's waist to meet people's expectations for modern office chairs. Summary of the invention

[0007] The purpose of the present invention is to overcome the deficiencies existing in the above-mentioned prior art and provide a chair back based on ergonomics; the upper back component includes two side back units arranged side by side, and the lumbar support also includes two side lumbar support bodies arranged side by side; so that the chair back has a four-back structure as a whole, which can provide targeted zoning support for the user's back; and the two side back units of the upper back component can be elastically retracted or expanded, so that they can always fit the user's upper back and match the user's dynamic sitting posture changes; and the elastic soft ring can also cushion the user, soothe the user's back, and avoid stiff support. The lumbar support is arched forward as a whole to achieve a waist-supporting effect, which conforms to the ergonomic curve of the back; and the lumbar support can also adjust the degree of waist-supporting according to users of different body shapes or the user's own needs; it is more humane to use.

[0008] Furthermore, the present invention provides a chair using the above-mentioned chair back.

[0009] The technical solution of the present invention is achieved in this way:

[0010] A chair back based on ergonomics includes a back support, the back support is provided with: an upper back assembly, including two side back units arranged side by side on the left and right and an elastic block connected between the two side back units; the upper part of the back support is provided with support arms extending toward the left and right sides respectively for connecting and supporting the side back units; a single support arm is connected to the outer side of the side back unit, the support arm is connected to the side back unit front and back and an elastic soft ring that can be squeezed and deformed is provided between the two; the elastic block is an elastic rubber body with a plate-like structure, the elastic block includes a main support block and side connecting blocks located on both sides of the main support block; the main support block is clamped between the two side back units and each side back unit is configured to be plugged and matched with the side connecting blocks; the two side back units can elastically shrink or expand relative to the back support in the front and rear direction; a lumbar support member is arranged on the upper back support The back support is provided at the bottom of the back support and protrudes forward from the upper back support; the lumbar support is elastic and arched forward in the middle, and includes a lumbar support frame with a left-right symmetrical frame structure and two side lumbar support bodies arranged on the lumbar support frame in parallel on the left and right; the side lumbar support bodies are made of flexible material, the lumbar support frame is elastic and is configured to provide elastic support for the side lumbar support bodies; a lumbar support bracket is installed at the lower part of the back support; the lumbar support is connected to the lumbar support bracket, and the upper and lower ends of the lumbar support are respectively rotatably matched with the lumbar support bracket; a sliding seat that can be slid up and down and adjusted along the lumbar support bracket is provided at the lower part of the lumbar support bracket, and the lower end of the lumbar support is rotatably connected to the sliding seat; the lumbar support can respond to the lifting and lowering movement of the sliding seat and undergo elastic deformation in the longitudinal direction to change its own forward arch degree.

[0011] Preferably, the main support block is perpendicular to the side connection block, and the front and rear ends of the main support block protrude from the side connection block; a mounting socket is provided at the middle position of the inner side of each side back unit, and the side connection block is plugged into the mounting socket. Then, the two side connection blocks can be elastically bent and deformed relative to the main support block so that the two side back support members can shrink inward and expand outward, so that the backrest can adaptively fit the back of the human body; and the side connection block is plugged into the mounting socket, so that the two side back units are tightly connected, eliminating the connection traces.

[0012] Preferably, the side back unit is a rectangular frame structure, and the side back unit includes an inner rod and an outer rod spaced apart from each other; the elastic block is connected between the inner rods of the two side back units; and the mounting socket is arranged at the middle position of the rear end of the inner rod. The inner rod and the elastic block are conveniently connected by plug-in matching; and the mounting socket is arranged at the rear end of the inner rod, which does not affect the supporting effect of the front end of the side back unit.

[0013] Preferably, a spacer is provided at the middle position of the side connection block to form two upper and lower independent plug blocks, and two slots spaced apart from each other are correspondingly provided on the inner side of the mounting socket, and the plug blocks are plugged into the slots. Further separating the side connection block into two plug blocks makes the elastic deformation effect better and avoids the difficulty of deformation of a whole structure.

[0014] Preferably, a connecting back cover is provided at the rear end of each mounting socket, which is connected to the rear end of the mounting socket and can limit the plug-in block from being separated from the slot; the plug-in block is provided with a first limiting hole spaced longitudinally and a first connecting through-hole distributed on both sides of the first limiting hole; a second limiting hole that coincides with the first limiting hole front and back and a second connecting through-hole that coincides with the first connecting through-hole front and back are correspondingly provided on the rear end face of the mounting socket; a limiting column and a connecting steel buckle are correspondingly provided on the connecting back cover, and the limiting column is configured to be successively penetrated into the second limiting hole and the first limiting hole; the connecting steel buckle is a steel sheet that extends backward on all sides and has arc-shaped inverted teeth distributed on the periphery; the connecting steel buckle is configured to pass through the second connecting through-hole and the first connecting through-hole in sequence so that the arc-shaped inverted teeth are connected with the front and rear teeth of the plug-in block. Then, the limiting column can ensure that the plug block and the mounting socket are firmly plugged in; and the arc-shaped inverted teeth can elastically shrink to a certain extent. When the connecting steel buckle passes through the second connecting through-hole and the first connecting through-hole, the arc-shaped inverted teeth will shrink toward the center; after the connecting steel buckle completely passes through the first connecting through-hole, the arc-shaped inverted teeth are elastically reset to connect with the front and rear teeth of the plug block, and the side connecting block is an elastic rubber body, so that the arc-shaped inverted teeth can be partially inserted into the side connecting block, thereby limiting the connection back cover from being separated from the mounting socket; you only need to directly buckle the connection back cover on the mounting socket, and the connection is very convenient; the connection back cover can not only play a decorative effect, but also play a connection limiting role.

[0015] Preferably, a support extending toward the center is provided on the outer rod of the side back unit, and a connecting seat is provided at the end of the support arm, which is connected to the support front and back; the elastic soft ring is clamped between the connecting seat and the support; a connecting column extending backward is provided at the rear end of the support; a mounting groove is provided at the rear end of the connecting seat; the connecting column passes through the elastic soft ring and the connecting seat backward in sequence and is located in the mounting groove; a damping rubber ring is also provided in the mounting groove, and a through hole is provided on the damping rubber ring for the connecting column to pass through; the damping rubber ring is embedded in the mounting groove and the connecting column is passed through the damping rubber ring, and the damping rubber ring is in close contact with the inner wall of the mounting groove; a gasket and a bolt are provided at the rear end of the connecting column, and the bolt passes through the gasket and is connected to the connecting column. The elastic soft ring and the damping rubber ring can achieve a "soft connection" between the connecting seat and the support; the two can move relative to each other within a certain range, so that the side back unit can provide elastic support; and when the user leans back on the chair back assembly, the elastic soft ring can play a role of elastic buffering, soothing the user's back and avoiding stiff support.

[0016] Preferably, the end of the support is provided with a first limiting protrusion protruding backward, and the connecting column is arranged on the first limiting protrusion and extends backward; the front end of the elastic soft ring is correspondingly provided with a first groove capable of cooperating with the first limiting protrusion; the front end of the connecting seat is provided with a second limiting protrusion protruding forward; accordingly, the rear end of the elastic soft ring is provided with a second groove capable of cooperating with the second limiting protrusion; and the connecting seat is provided with a connecting hole that runs through the front and back for avoiding the connecting column, and the connecting hole is formed at the front end of the second limiting protrusion. The first limiting protrusion is embedded in the first groove, which can make the support and the elastic soft ring fit tightly and avoid the elastic soft ring from running off; the second limiting protrusion is embedded in the second groove, which can also make the connecting seat and the elastic soft ring fit tightly; and the connecting column can easily pass through the connecting hole; so that the elastic soft ring can be stably limited between the support and the connecting seat.

[0017] Preferably, the elastic soft ring is engaged with the support, one of the elastic soft ring and the support is provided with an arc-shaped slot, and the other of the elastic soft ring and the support is provided with an arc-shaped block; the block is engaged in the slot to fix the elastic soft ring and the support in the circumferential direction, further preventing the elastic soft ring from rotating relative to the support when subjected to extrusion force.

[0018] Preferably, the lower part of the lumbar support bracket has a longitudinal sliding support part, and the sliding seat is slidably connected to the front end of the sliding support part; a gear adjustment mechanism is provided between the sliding seat and the sliding support part; the gear adjustment mechanism includes an annular guide groove recessed on the end face of the sliding support part and a gear adjustment tooth arranged in the annular guide groove; a longitudinally spaced positioning groove is provided on one side of the gear adjustment tooth; a longitudinal adjustment member that can deflect left and right is provided in the sliding seat, and the adjustment member is provided with a pin that protrudes and fits in the annular guide groove and can be engaged with the positioning groove; and the adjustment member always has a tendency to remain straight; during the rising process of the sliding seat, the pin moves up along the annular guide groove and can be engaged in the positioning groove in sequence under the self-centering force of the adjusting member; during the descending and resetting process of the sliding seat, the pin moves down along the annular guide groove and is reset.

[0019] Preferably, the annular guide groove includes a longitudinal ascending groove located on one side of the gear adjustment tooth with the positioning slot, and a longitudinal reset groove located on the other side of the gear adjustment tooth; during the ascending process of the slide, the adjusting member deflects toward the ascending groove, the bayonet moves up along the ascending groove and can be sequentially engaged in the positioning slots at different positions under the return action of the adjusting member; during the descending and resetting process of the slide, the adjusting member deflects from the ascending groove to the reset groove, and the bayonet descends and resets along the reset groove. The ascending adjustment and descending resetting of the slide can be realized by moving the bayonet along the annular guide groove for one circle, so that the ascending and descending adjustment of the slide is stable; and during the ascending process, the bayonet engages with the positioning slots at different positions so that the slide has multiple adjustment gears.

[0020] Preferably, the slide is provided with a receiving groove for receiving the adjusting member; the lower end of the adjusting member is rotatably connected in the receiving groove, the bayonet is arranged at the upper end of the adjusting member and is inserted into the annular guide groove backward; elastic members arranged transversely are respectively arranged on both sides of the adjusting member; one end of each elastic member is connected to the side end of the adjusting member, and the other end is connected to the side wall of the receiving groove; the elastic member can elastically deform in response to the deflection movement of the adjusting member to provide elastic force for the adjusting member to return to the straight state again. The adjusting member is hidden inside the slide, and the structure is beautiful; and under the action of the elastic member, the adjusting member always has a tendency to return to the normal position after deflection.

[0021] Preferably, the waist support frame is detachably connected to the side waist support body; the waist support frame includes longitudinal strip side bars located on the left and right sides, lower cross bars respectively arranged at the bottom of each strip side bar, and upper cross bars respectively arranged at the upper end of each strip side bar; the rear end of each side waist support body is respectively provided with an upper embedding groove, a side embedding groove and a lower embedding groove which can respectively cooperate with the upper cross bar, the strip side bar and the lower cross bar. Then the waist support frame can be embedded in the side waist support body, so that the two are convenient to connect and have good integrity after connection.

[0022] Preferably, the waist support frame is made of nylon, and the side waist support body is made of TPU soft rubber. The waist support frame is made of nylon material, which has good toughness and can provide sufficient support; and the waist support frame is set as a frame structure, which is more convenient for elastic deformation in the vertical direction; the side waist support body is made of TPU soft rubber, which is easier to deform and has good ductility; then the waist support member composed of the waist support frame and the side waist support body can not only maintain the overall shape of the waist support, so that the waist support member has a good deformation effect in the vertical direction; it can also ensure the support of the waist support member; avoid the deformation of a whole structure.

[0023] Preferably, the upper part of the lumbar support is provided with ring arms extending toward both sides, and upper rotating supports for rotationally connecting with the ring arms are provided on the left and right sides of the upper end of the lumbar support respectively; two lower rotating supports for rotationally connecting with the slide seat are provided at the middle position of the bottom of the lumbar support, and the slide seat is clamped between the two lower rotating supports. The lumbar support and the lumbar support are connected at three points in a triangular form, and the connection structure is stable; and the slide seat is connected between the two lower rotating supports, so that the connection between the slide seat and the lumbar support is stable.

[0024] Preferably, the upper rotating support includes a first upper rotating rib provided on the lumbar support frame and a second upper rotating rib provided at a corresponding position on the upper end of the side lumbar support body and extending backward; the first upper rotating rib overlaps with the second upper rotating rib. The first upper rotating rib overlaps with the second upper rotating rib to form the upper rotating support together, so that the structure has good integrity; and the upper rotating support is usually rotatably connected to the lumbar support bracket by a transverse pin shaft, and the pin shaft can also simultaneously connect the first upper rotating rib and the second upper rotating rib together, so that the structure of the connection is stable.

[0025] Preferably, the lower rotating support comprises two rotating protrusions arranged at the lower end of the lumbar support frame, which are spaced apart from each other and protrude backwards, and a lower rotating rib arranged at a corresponding position at the lower end of the side lumbar support body and protruding backwards; a connecting groove with an opening at the front end is provided in the rotating protrusion, and the lower rotating rib is embedded in the connecting groove. The lower rotating rib is embedded in the rotating protrusion to form a lower rotating support, and the lower rotating support is also usually connected by a transverse pin shaft, so that after the pin shaft is connected, the lower rotating rib and the rotating protrusion can be connected together at the same time, saving connection steps and improving the structural strength of the connection.

[0026] Further, a seat is provided, comprising the above-mentioned chair back.

[0027] The design starting point, concept and beneficial effects of the present invention using the above technical solution are:

[0028] First, the ergonomic chair back of the present invention, the upper back component includes two side back units arranged side by side, and the lumbar support also includes two side lumbar support bodies arranged side by side, so that the chair back has a four-back structure as a whole, which can provide targeted zoning support for the user's back. The two side back units are connected together by elastic blocks, so that the two side back units can shrink inward and expand outward, so that after the user leans on the two side back units, the two side back units can adaptively fit the human back, match the dynamic sitting posture of the human body, and make the user feel more comfortable. The elastic soft ring is clamped between the support and the connecting seat and can be squeezed and deformed to achieve a "soft connection" between the two, so that when the user leans back on the chair back, the elastic soft ring can play the role of elastic buffering, soothing the user's back and avoiding stiff support. The lumbar support is arched forward as a whole to support the waist, which conforms to the ergonomic curve of the back. The lumbar support can also adjust the degree of waist support according to users of different body shapes or the user's own needs. It is more user-friendly. The lumbar support is composed of a lumbar support frame and a side lumbar support body, which makes it easier to deform the lumbar support and maintains support.

[0029] Secondly, the connecting block on the opposite side of the rear cover is limited with the mounting socket; the rear cover is provided with a limiting column and a connecting steel buckle; the limiting column can ensure that the plug block and the mounting socket are firmly plugged in; and the arc-shaped inverted teeth can be elastically contracted to a certain extent, and when the connecting steel buckle passes through the second connecting through hole and the first connecting through hole, the arc-shaped inverted teeth will contract toward the center; after the connecting steel buckle completely passes through the first connecting through hole, the arc-shaped inverted teeth are elastically reset to connect with the front and rear teeth of the plug block, and the elastic block is an elastic rubber body, so that the arc-shaped inverted teeth can be partially inserted into the side connecting block, thereby limiting the plug block from being separated from the mounting socket; the connection operation is convenient. The rear cover can be used as a decorative cover and can also play a role in connection limiting.

[0030] Furthermore, the lumbar support member is formed by connecting a lumbar support frame and two side lumbar support bodies front to back; the lumbar support frame is embedded in the rear end of the side lumbar support body, and the structure has good integrity and is beautiful; wherein, the lumbar support frame is made of nylon material, has good toughness, and can provide sufficient elastic support; and the lumbar support frame is set as a frame structure, which is more conducive to elastic deformation in the vertical direction; the side lumbar support body is made of TPU soft rubber, which is easier to deform and has good ductility; then the lumbar support member formed by the lumbar support frame and the side lumbar support body can maintain the overall shape of the lumbar support, and the deformation effect of the lumbar support member in the vertical direction is good; compared with the lumbar support made of a whole piece of elastic structure in the prior art, the lumbar support member of the utility model is undoubtedly more labor-saving and easy to deform. The strip side bars, upper cross bar and lower cross bar of the lumbar support frame can provide sufficient support strength for the user, so that the support of the lumbar support is not a problem; and a plurality of longitudinally spaced grooves are provided on the front end surface of the strip side bars; thereby, the strip side bars are staggered in thin and thick intervals, making it easier for them to undergo elastic bending deformation.

[0031] In addition, a gear adjustment mechanism is provided between the slide and the sliding support part, so that the slide can be adjusted up and down along the sliding support part and has multiple adjustment positions; then, the slide can be raised to drive the lower end of the lumbar support to rise, so that the lumbar support can be elastically deformed in the longitudinal direction to push forward, so that the lumbar support also has multiple waist-supporting states; the seat slide can be lowered and reset to make the lumbar support retract backward; then, the waist-supporting degree of the lumbar support can be easily adjusted. And the user only needs to directly apply force to the slide to make it move up and down to adjust the position of the slide, so that it can be adjusted without leaving the seat surface, making the operation light and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A side view of the entire chair back in an embodiment of the present invention;

[0033] Figure 2 It is a schematic diagram of the three-dimensional structure of the entire chair back in an embodiment of the present invention;

[0034] Figure 3 It is a front three-dimensional structural schematic diagram of the connection between the side back unit and the back support in an embodiment of the present invention;

[0035] Figure 4 It is a schematic diagram of the back three-dimensional structure of the side back unit connected to the back support in an embodiment of the present invention;

[0036] Figure 5 It is a schematic diagram of a three-dimensional structure of two side back units connected in an embodiment of the present invention;

[0037] Figure 6 It is a schematic diagram of the three-dimensional structure of the elastic block connected to the side back unit in an embodiment of the present invention;

[0038] Figure 7 It is a schematic diagram of the three-dimensional structure of the elastic block in the embodiment of the present invention;

[0039] Figure 8 It is a schematic diagram of a three-dimensional structure of connecting the rear cover with the mounting socket and the plug block in an embodiment of the present invention;

[0040] Fig. 9 It is a schematic diagram of the three-dimensional structure of the connection between the support arm and the side back unit in the embodiment of the present invention;

[0041] Fig.10 It is a schematic diagram of an exploded structure of the connection between the support arm and the support in an embodiment of the present invention;

[0042] Fig.11 It is a schematic diagram of the structure explosion at another angle of the connection between the support arm and the support in the embodiment of the present invention;

[0043] Fig.12 It is a schematic diagram of the back three-dimensional structure of the connection between the lumbar support member and the lumbar support bracket in an embodiment of the present invention;

[0044] Fig.13 It is a front perspective structural diagram of the connection between the lumbar support member and the lumbar support bracket in an embodiment of the present invention;

[0045] Fig.14 It is a schematic diagram of the three-dimensional structure of the waist support frame and the side waist support body in the embodiment of the present invention;

[0046] Fig.15 It is a schematic diagram of the three-dimensional structure of the waist support frame and the side waist support body in another angle in the embodiment of the present invention;

[0047] Fig.16 It is a schematic diagram of the three-dimensional structure of the lumbar support member in an embodiment of the present invention;

[0048] Fig.17 It is a schematic diagram of the three-dimensional structure of the sliding seat and the sliding support part slidingly cooperating in the embodiment of the present invention;

[0049] Fig.18 It is a schematic diagram of the three-dimensional structure of the adjustment member and the annular guide groove in the embodiment of the present invention;

[0050] Fig.19 It is a schematic diagram of the three-dimensional structure of the adjusting member located in the sliding seat in the embodiment of the present invention;

[0051] Fig. 20 It is a schematic diagram of the three-dimensional structure of the annular guide groove in an embodiment of the present invention.

[0052] The reference numerals of the figures are as follows: back support 1; upper back assembly A; side back unit 2; support arm 3; support seat 4; elastic soft ring 5; elastic block 6; main support block 6a; side connecting block 6b; inner rod 7; outer rod 8; first limiting protrusion 9; connecting column 10; mounting hole 10a; first groove 11; connecting seat 12; decorative cover 12a; second limiting protrusion 13; second groove 14; connecting hole 15; mounting groove 16; damping rubber ring 17; mounting hole 171; gasket 171; bolt 172; mounting socket 18; plug block 19; slot 20; first limiting hole 21; first connecting through hole 22; notch 22a; second limiting hole 23; second connecting through hole 24; connecting back cover 25; limiting column 26; connecting steel buckle 27; arc-shaped inverted tooth 27a; positioning column 28; block 29; slot 30; lumbar support member 31; lumbar support bracket 32; sliding support portion 32a; slide seat 33; ring arm 34; rotating mounting seat 34a; upper rotating support 35; lumbar support frame 311; lateral lumbar support body 312; strip side rod 36; lower cross bar 37; upper cross bar 38; supporting cross bar 39; rotating protrusion 40; upper embedded groove 381; side embedded groove 361; lower embedded groove 371; groove 41; first rotating rib 351; second rotating rib 352; lower rotating rib 42; connecting groove 43; lower rotating support 44; guide groove 45; guide strip 46; annular guide groove 47; rising groove 47a; reset groove 47b; gear adjustment tooth 48; positioning slot 49; accommodating groove 50; adjusting member 51; latch 52; avoidance groove 53; elastic member 54. DETAILED DESCRIPTION

[0053] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0054] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0055] In the description of the present invention, the term "at least one" refers to one or more than one, unless otherwise clearly defined. The terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0056] The specific implementation methods of the present invention are as follows:

[0057] like Figure 1-20As shown, the present invention provides an ergonomic chair back, including a back support 1 and an upper back assembly A arranged on the back support 1, the upper back assembly A includes two side back units 2 arranged side by side on the left and right; the upper part of the back support 1 is provided with support arms 3 extending toward the left and right sides respectively, and the outer side of each side back unit 2 is provided with a support seat 4 connected to the support arm 3; the support arm 3 and the support seat 4 are connected together front to back and an elastic soft ring 5 that can be squeezed and deformed is clamped therebetween; the support arm 3 and the support seat 4 are "softly connected" under the action of the elastic soft ring 5, so that when the user leans back on the upper back assembly A, the elastic soft ring 5 can play a role of elastic buffering, soothe the user's back, and avoid stiff support. Furthermore, an elastic block 6 is provided between the two side back units 2, and the elastic block 6 is made of elastic rubber; the elastic block 6 includes a main support block 6a longitudinally clamped between the two side back units 2, and side connecting blocks 6b perpendicular to the main support block 6a and extending toward both sides from the main support block 6a for connecting with the side back units 2; the two side connecting blocks 6b can be elastically bent and deformed relative to the main support block 6a, so that the two side back units 2 can elastically shrink or expand relative to the back support 1 along the front-to-back direction, so that after the user leans on the two side back units 2, the two side back units 2 can adaptively fit the human back, making the user feel more comfortable; and when the back support 2 moves, the elastic soft ring 5 can also be squeezed between the support arm 3 and the support seat 4 to deform accordingly to avoid breakage at the connection. In addition, a lumbar support 31 is provided on the back support 1 below the upper back assembly A. The lumbar support 31 can support the user's waist to form support for the natural curvature of the lumbar spine, conforming to the engineering curve of the human back; and the degree of support of the lumbar support 31 can also be adjusted.

[0058] like Figure 1-11As shown, the side back unit 2 is a rectangular frame structure, and the side back unit 2 includes an inner rod 7 and an outer rod 8 spaced apart from each other; the elastic block 6 is connected between the inner rods 7 of the two side back units 2. The support 4 is arranged on the outer rod 8 of each side back unit 2, and the support 4 extends toward the center direction of the side back unit 2. The specific connection structure between the support 4 and the support arm 3 is as follows: a first limiting protrusion 9 protruding backward is provided at the end of the support 4, and a connecting column 10 extending backward is provided on the first limiting protrusion 9, and a mounting hole 10a with an internal thread is provided on the end surface of the connecting column 10; the elastic soft ring 5 is also an elastic rubber body, and a first groove 11 cooperating with the first limiting protrusion 9 is provided at the front end of the elastic soft ring 5; the elastic soft ring 5 can be fitted on the rear end of the support 4 so that the first limiting protrusion 9 is embedded in the first groove 11; and the connecting column 10 simultaneously passes through the elastic soft ring 5 backward. A connecting seat 12 having a contour matching that of the elastic soft ring 5 is provided at the end of the support arm 3, and a second limiting protrusion 13 protruding forward is provided at the front end of the connecting seat 12, and correspondingly, a second groove 14 is provided at the rear end of the elastic soft ring 5; and a connecting hole 15 penetrating front and back is provided on the connecting seat 12, and the connecting hole 15 is formed at the front end of the second limiting protrusion 13; in addition, a mounting groove 16 for avoiding the connecting column 10 is also provided at the rear end of the connecting seat 12; during assembly, the first limiting protrusion 9 is embedded in the first groove 11, and the second limiting protrusion 13 is embedded in the second groove 14, so that the support 4, the elastic soft ring 5 and the connecting seat 12 are tightly attached to each other front and back; the connecting column 10 will pass through the elastic soft ring 5 and the connecting hole 15 backward and be located in the mounting groove 16. The first limiting protrusion 9 is embedded in the first groove 11, and the second limiting protrusion 13 is embedded in the second groove 14, so that the elastic soft ring 5 can be tightly clamped between the support 4 and the connecting seat 12, and the elastic soft ring 5 can be prevented from deviating; in addition, an arc-shaped clamping block 29 protruding forward is provided at the front end of the elastic soft ring 5, and an arc-shaped clamping groove 30 is correspondingly provided at the corresponding position of the rear end of the support 4; the clamping block 29 is clamped in the clamping groove 30, so that the elastic soft ring 5 and the support 4 are fixed circumferentially, thereby preventing the elastic soft ring 5 from rotating relative to the support 4 when subjected to extrusion force; the elastic soft ring 5 is firmly clamped between the support 4 and the connecting seat 12.

[0059] like Fig.10 , 11As shown, a damping rubber ring 17 is also provided in the mounting groove 16, and a through hole is provided on the damping rubber ring 17 for the connecting column 10 to pass through; the damping rubber ring 17 is embedded in the mounting groove 16 and the connecting column 10 is passed through the damping rubber ring 17; and the damping rubber ring 17 is in close contact with the inner wall of the mounting groove 16; then a gasket 171 and a bolt 172 are sequentially provided at the rear end of the connecting column 10, and the bolt 172 passes through the gasket 171 and is connected to the mounting hole 10a; thereby, the connecting column 10 is fixed in the mounting groove 16; and the support 4 and the support arm 3 are firmly connected front and back. Under the action of the damping rubber ring 17, the connecting column 10 will not directly contact the connecting seat 12, and the damping rubber ring 17 is wrapped around the connecting column 10; so that the connecting column 10 can squeeze and act on the damping rubber ring 17; furthermore, under the action of the elastic soft ring 5, the support 4 and the support arm 3 can also move with each other to squeeze the elastic soft ring 5, so that the two are not rigidly connected; then the "soft connection" between the support 4 and the support arm 3 can be achieved, so that the two can move within a certain range, that is, the support 4 can deflect left and right, up and down within a certain range relative to the connecting seat 12; so that when the user leans back on the upper back component A, the elastic soft ring 5 can play the role of elastic buffering, soothing the user's back and avoiding stiff support. In addition, a decorative cover 12a is also connected to the rear end of the connecting seat 12, and the decorative cover 12a can cover the installation groove 16, thereby hiding the connection traces and beautifying the appearance.

[0060] like Figure 3-8 As shown, the two side back units 2 are connected together by an elastic block 6, and a mounting socket 18 is provided at the middle position of the rear end of the inner rod 7 of each side back unit 2; the side connecting block 6b and the mounting socket 18 are plug-fitted; specifically: a gap is provided at the middle position of the side connecting block 6b to form two upper and lower independent plug-in blocks 19; correspondingly, two upper and lower spaced slots 20 are provided on the inner side of the mounting socket 18; when connecting, the side connecting block 6b is plug-fitted with the mounting socket 18 so that the plug-in block 19 is plugged into the slot 20; and the mounting socket 18 protrudes backward from the inner rod 7, so that the side connecting block 6b can be set with sufficient thickness to ensure the structural strength of the connection.

[0061] Further, two longitudinally spaced first limiting holes 21 and two first connecting through holes 22 are arranged on each plug block 19. A second limiting hole 23 that overlaps with the first limiting hole 21 is arranged on the rear end surface of the mounting socket 18, and a second connecting through hole 24 that overlaps with the first connecting through hole 22 is arranged on the rear end surface. A connecting back cover 25 is further assembled at the rear end of the mounting socket 18, and the connecting back cover 25 is provided with longitudinally spaced limiting posts 26 for cooperating with the first limiting holes 21 and the second limiting holes 23; and a connecting steel buckle 27 for passing through the first connecting through hole 22 and the second connecting through hole 24, the connecting steel buckle 27 is a steel sheet that extends backwards on all sides and has arc-shaped inverted teeth 27a distributed on the periphery, and there is a hole in the middle of the connecting steel buckle 27 for screws to pass through, and a positioning post 28 is arranged on the connecting back cover 25, and the connecting steel buckle 27 is connected to the positioning post 28 by screws, so that the connecting steel buckle 27 is firmly arranged on the connecting back cover 25. After the side connecting block 6b is plugged into the mounting socket 18, the connecting rear cover 25 is connected to the rear end of the mounting socket 18, so that the limiting column 26 is sequentially inserted into the second limiting hole 23 and the first limiting hole 21; and the connecting steel buckle 27 will sequentially pass through the second connecting through hole 24 and the first connecting through hole 22 and make the arc-shaped inverted teeth 27a connected with the front and rear teeth of the plug-in block 19; specifically, it means that the arc-shaped inverted teeth 27a can elastically shrink to a certain extent, and when the connecting steel buckle 27 passes through the second connecting through hole 24 and the first connecting through hole 22, the arc-shaped inverted teeth 27a will shrink toward the center; after the connecting steel buckle 27 completely passes through the first connecting through hole 22, the arc-shaped inverted teeth 27a will shrink toward the center. 27a is elastically reset to engage with the front and rear teeth of the plug block 19, and the side connecting block 6b is an elastic rubber body, so that the arc-shaped inverted teeth 27a can be partially inserted into the side connecting block 6b; then when the connecting back cover 25 is assembled on the mounting socket 18, the limiting column 26 can keep the plug block 19 and the mounting socket 18 firmly plugged in, so that the side connecting block 6b will not be separated from the mounting socket 18; and the arc-shaped inverted teeth 27a and the plug block 19 tooth connection can limit the connecting back cover 25 from being separated from the mounting socket 18; so that the side connecting block 6b is stably plugged in the mounting socket 18, and the connecting structure is simple and stable; so that the connecting back cover 25 can have both a decorative effect and a connection limit function, playing a dual role.

[0062] And if Figure 4-6 As shown, the first connecting through hole 22 located on the outside of the plug block 19 is formed with a notch 22a at the side end of the plug block 19; since the first connecting through hole 22 is larger in size in order to allow the connecting steel buckle 27 to pass through; in order to avoid interference during assembly, a notch 22a is provided at the first connecting through hole 22 located on the outside of the plug block 19 to make the installation smoother.

[0063] In addition, the main support block 6a is perpendicular to the side connecting block 6b, and the front and rear ends of the main support block 6a both protrude from the side connecting block 6b; when the side connecting block 6b is assembled with the mounting socket 18; the main support block 6a is clamped between the two inner rods 7, and the front and rear length of the main support block 6a is not less than the front and rear thickness of the side back unit 2, so that the main support block 6a can be stably clamped between the two inner rods 7 to provide support; and the left and right thickness of the main support block 6a is between 5-15mm; so that the main support block 6a has a certain thickness, making the structure stable; but the thickness cannot be too large, resulting in too large a distance between the two side back units 2.

[0064] Then, through the above connection structure, the two side connection blocks 6b can be elastically deformed relative to the main support block 6a, so that the two side back units 2 can shrink inward and expand outward, so that after the user leans on the two side back units 2, the two side back units 2 can adaptively fit the back of the human body, so that the two sides of the user's back will never lose support, making the user feel more comfortable. In addition, the support 4 and the support arm 3 are "softly connected" under the action of the elastic soft ring 5 and the damping rubber ring 17, so that when the back support 2 moves, the two can be deformed accordingly, providing elastic buffering and avoiding stiff support; thereby realizing the adaptive function of the backrest.

[0065] like Figure 1-2 As shown in 12-20, a lumbar support 32 is also installed at the front end of the lower part of the back support 1; the upper and lower ends of the lumbar support member 31 are rotatably connected to the lumbar support member 32 respectively; the lumbar support member 31 is elastic and the middle position is arched forward, so that the lumbar support member 31 can provide lumbar support for the user. A longitudinal sliding support portion 32a is provided at the lower part of the lumbar support bracket 32, and a slide seat 33 is slidably provided on the sliding support portion 32a; the slide seat 33 can be slid up and down along the sliding support portion 32a; and a gear adjustment mechanism is provided between the slide seat 33 and the sliding support portion 32a, so that the slide seat 33 can rise along the sliding support portion 32a and stay at gear positions of different heights; the lower end of the lumbar support member 31 is rotatably connected to the slide seat 33; then, by acting on the slide seat 33 to move up and down, the lower end of the lumbar support member 31 can be driven to move up and down, so that the lumbar support member 31 is elastically deformed along the longitudinal direction to be pushed forward or retracted backward; thereby, the lumbar support member 31 can be adjusted to the lumbar support degree according to user needs.

[0066] like Figure 13-16As shown, the waist support member 31 comprises a waist frame 311 of a frame structure and two side waist supports 312 connected to the front end of the waist frame 311 in parallel. Specifically, the waist frame 311 is a left-right symmetrical structure, and the waist frame 311 comprises longitudinal strip side bars 36 respectively located on the left and right sides, lower cross bars 37 respectively arranged at the bottom of each strip side bar 36, and upper cross bars 38 respectively arranged at the upper end of each strip side bar 36. The two upper cross bars 38 are spaced apart from each other, and a support cross bar 39 for connecting and cooperating with the slide seat 33 is connected between the two lower cross bars 37, and two rotating protrusions 40 spaced apart from each other and protruding backward are arranged on the support cross bar 39. The waist frame 311 is made of nylon material and has a certain toughness. Further, the side waist support body 312 is made of TPU soft rubber, and the rear end of each side waist support body 312 is provided with an upper embedding groove 381, a side embedding groove 361 and a lower embedding groove 371 which can respectively cooperate with the upper cross bar 38, the strip side bar 36 and the lower cross bar 37; then the side waist support body 312 can be connected to the waist support frame 311 front and back, so that the upper cross bar 38 is embedded in the upper embedding groove 381, the strip side bar 36 is embedded in the side embedding groove 361, and the lower cross bar 37 is embedded in the lower embedding groove 371. And the support cross bar 39 is connected to the rear end surface of the two lower cross bars 37, which plays a role in strengthening the structural strength and keeping the two side waist support bodies 312 synchronously lifting and lowering; the support cross bar 39 protrudes backward from the lower cross bar 37, so that the support cross bar 39 will not interfere with the side waist support body 312; so that the waist support frame 311 can stably fit and support the two side waist support bodies 312. The purpose of adopting the above structural design is: the lumbar support frame 311 is a frame structure made of nylon material, which has good toughness and can provide support, and the frame structure is more conducive to elastic deformation in the vertical direction; and the side waist support body 312 is made of TPU soft rubber, which is easier to deform and has good ductility; and then the lumbar support member 31 formed by the combination of the two can not only maintain the overall shape of the lumbar support, but also make the lumbar support member 31 have a good deformation effect in the vertical direction, so that the process of adjusting the waist support degree is easy and labor-saving. Otherwise, if the entire lumbar support member 31 is made of nylon or elastic plastic, the entire structure will be difficult to deform, making the adjustment operation laborious. Further, if Fig.14 As shown, a plurality of longitudinally spaced grooves 41 are provided on the front end surface of the strip side bar 36, so that the strip side bar 36 is staggered in thickness, making it easier for it to undergo elastic bending deformation. The deformation of the strip side bar 36 can directly deform the side waist support body 312 to adjust the top waist degree, thereby making the adjustment operation easier and more labor-saving.

[0067] In addition, a first upper rotating rib 351 protruding backward is provided at the outer end of each lower cross bar 37, and a second upper rotating rib 352 protruding backward is correspondingly provided at the upper end of each side waist support body 312; when the side waist support body 312 is connected to the waist support frame 311 front and back, the first upper rotating rib 351 and the second upper rotating rib 352 can overlap left and right to form an upper rotating support 35. The upper end of the waist support frame 32 is provided with a ring arm 34 extending toward both sides, and the end of the ring arm 34 is provided with a rotating mounting seat 34a; the rotating mounting seat 34a is configured to be rotatably connected with the upper rotating support 35; and the rotating mounting seat 34a and the upper rotating support 35 are rotatably connected by a transverse pin shaft, so that after the rotation connection, the pin shaft can also limit the first upper rotating rib 351 and the second upper rotating rib 352 at the same time, so that the upper end of the side waist support body 312 is connected to the upper end of the waist support frame 311, and the waist support frame 311 is prevented from being separated from the side waist support body 312. During the elastic deformation of the lumbar support 31, the upper rotating support 35 will adaptively rotate relative to the rotating mounting seat 34a to avoid the connection being broken by force; and the ring arms 34 on both sides are respectively connected to the two sides of the upper end of the lumbar support 31, which can stably support the lumbar support 31. Figure 14-16 As shown, a lower rotating rib 42 protruding backward is provided at the position corresponding to the rotating protrusion 40 at the lower end of the side waist support body 312, and a connecting groove 43 is provided at the front end of the rotating protrusion 40 for the lower rotating rib 42 to pass through. After the waist support frame 311 is connected to the side waist support body 312, the lower rotating rib 42 can just be embedded in the connecting groove 43, and the two together form a lower rotating support 44; the lower rotating support 44 is configured to be rotatably connected to the slide 33, and the lower rotating rib 42 and the rotating protrusion 40 are rotatably connected to the slide 33 using a pin shaft, so that the lower end of the side waist support body 312 can also be connected to the lower end of the waist support frame 311. The above-mentioned rotating structure can realize the connection between the waist support member 31 and the waist support bracket 32, and can also make the waist support frame 311 and the side waist support body 312 stably connected together, saving the connection steps; the structural design is ingenious.

[0068] like Figure 12-13As shown in 17-20, the slide 33 is slidably connected to the front end of the sliding support part 32a, and longitudinal guide grooves 45 are respectively provided on the left and right sides of the sliding support part 32a, and a guide bar 46 that slides in the guide groove 45 is correspondingly provided at the rear end of the slide 33, so that the slide 33 can stably slide up and down along the sliding support part 32a, and the guide bar 46 cooperates with the guide groove 45 to limit the slide 33 and the sliding support part 32a from being separated front and back. Specifically, the gear adjustment mechanism is arranged between the sliding seat 33 and the sliding support part 32a, and the gear adjustment mechanism includes an annular guide groove 47 recessed on the front end surface of the sliding support part 32a and a gear adjustment tooth 48 arranged in the annular guide groove 47; a longitudinally spaced positioning groove 49 is provided on one side of the gear adjustment tooth 48, and the positioning groove 49 is arranged obliquely upward; the annular guide groove 47 includes a longitudinal rising groove 47a located on one side of the gear adjustment tooth 48 having the positioning groove 49, and a longitudinal reset groove 47b located on the other side of the gear adjustment tooth 48; and the upper end of the rising groove 47a is higher than the upper end of the reset groove 47b. A receiving groove 50 is provided in the slide 33, and a longitudinal adjusting member 51 is provided in the receiving groove 50. The lower end of the adjusting member 51 is rotatably connected to the slide 33, so that the adjusting member 51 can deflect left and right; the upper end of the adjusting member 51 is provided with a latch 52 that extends backwards in the annular guide groove 47 and can be engaged with the positioning latch 48; the slide 33 is provided with an arc-shaped avoidance groove 53 to avoid the movement of the latch 52. And the adjusting member 51 always has a tendency to remain straight, specifically: elastic members 54 are provided on both sides of the adjusting member 51, and the elastic members 54 are located in the receiving groove 50; one end of each elastic member 54 is connected to the side end of the adjusting member 51, and the other end is connected to the side wall of the receiving groove 50. Then, when the adjusting member 51 deflects, the elastic member 54 will deform and provide elastic force for the adjusting member 51 to return to a straight state again.

[0069] like Figure 19-20As shown, from bottom to top, the lower end and the upper end of the gear adjustment tooth 48 are both inclined sides inclined upward in the direction of the ascending groove 47a; then when the user acts on the slide seat 33 to ascend along the sliding support portion 32a, the adjustment member 51 will deflect to make the latch 52 enter the ascending groove 47a and ascend along the ascending groove 47a; and when the latch 52 moves to the position of one of the positioning slots 49, the adjustment member 51 can automatically return to the correct position so that the latch 52 is locked into the positioning slot 49 from the ascending groove 47a; at this time, the slide seat 33 is released, and the latch 52 The upper and lower engagement with the positioning slot 49 enables the slide 33 to stay at the adjustment height; if the slide 33 needs to be further adjusted, the slide 33 only needs to be pushed to continue to move upward, and the adjusting member 51 will deflect again to make the latch 52 upwardly disengage from the positioning slot 49 and enter the ascending groove 47a again; thus, during the ascending process of the slide 33, the latch 52 can be sequentially engaged in the positioning slots 49 at different heights, so that the slide 33 has multiple adjustment positions, and the adjustment process is very convenient, and only a force needs to be directly applied to the slide 33 to move it. When the slide 33 needs to be lowered and reset after it has risen, it only needs to be pushed to rise to the maximum height, and then the adjusting member 51 will automatically return to the positive deflection to make the latch 52 enter the reset groove 47b from the upper end of the ascending groove 47a downward; then the slide 33 can be directly pushed to move downward to the initial position, and the latch 52 will be lowered and reset along the reset groove 47b. Then, the latch 52 moves one circle along the annular guide groove 47 to realize the upward adjustment and downward reset of the slide 33 , so that the upward and downward adjustment of the slide 33 is stable and the operation is very simple.

[0070] like Figure 1 , 12 As shown in Figures 1 and 2, the slide 33 and the support cross bar 39 are butted and matched front and back, so that the slide 33 can be clamped between the two lower rotating supports 44, and each lower rotating support 44 is respectively connected to the side end of the slide 33; so that the lower end of the lumbar support 1 can be stably connected to the slide 33. Then, when the action slide 33 is adjusted up and down, it can drive the lower end of the lumbar support 1 to move up and down, so that the lumbar support 1 can be elastically deformed accordingly; when the action slide 33 is adjusted upward, the lumbar support 1 will continue to arch forward, so that the lumbar support effect is obvious; and because the slide 33 has multiple adjustment positions, the lumbar support 1 also has multiple lumbar support states accordingly. When the lumbar support effect is not needed, the action slide 33 only needs to be lowered and reset, and the lumbar support 1 can be retracted backward to the initial position. During the adjustment operation, the user can directly lift or lower the sliding seat 33 or the lower end of the lumbar support member 1, and make adjustments on the seat surface, thereby being able to adjust the lumbar support level of the lumbar support member 1 very conveniently and quickly.

[0071] In summary, the ergonomic chair back of the present invention, the upper back component A includes two side back units 2 arranged side by side, and the lumbar support 31 also includes two side lumbar support bodies 312 arranged side by side; so that the chair back has a four-back structure; it can provide partitioned support for the user's back; and the two side back units 2 of the upper back component A can be elastically retracted or expanded, so that they can always fit the user's upper back and match the user's dynamic sitting posture changes; and the elastic soft ring 5 can also cushion the user, soothe the user's back, and avoid stiff support. The lumbar support 31 is arched forward as a whole to achieve a waist-supporting effect, which conforms to the ergonomic curve of the back; and the lumbar support 31 can also adjust the waist-supporting degree according to users of different body shapes or the user's own needs; it is more humane to use.

Claims

1. A chair back based on ergonomics, characterized in that It includes a back support, on which is provided: The upper back assembly comprises two side back units arranged side by side and an elastic block connected between the two side back units; the upper part of the back support is provided with support arms extending toward the left and right sides respectively for connecting and supporting the side back units; a single support arm is connected to the outer side of the side back unit, the support arm is connected to the side back unit front and back, and an elastic soft ring capable of extrusion and deformation is provided between the two; the elastic block is an elastic rubber body with a plate-like structure, and the elastic block comprises a main support block and side connecting blocks located on both sides of the main support block; the main support block is clamped between the two side back units and each side back unit is configured to be plugged and matched with the side connecting block; the two side back units can elastically shrink inward or expand outward relative to the back support in the front-to-back direction; A lumbar support member is disposed below the upper back assembly and protrudes forward from the upper back assembly; The lumbar support is elastic and arches forward in the middle. The lumbar support comprises a lumbar support frame with a bilaterally symmetrical frame structure and two side lumbar support bodies arranged side by side on the lumbar support frame. The side lumbar support bodies are made of a flexible material. The lumbar support frame is elastic and is configured to provide elastic support to the side lumbar support bodies. A lumbar support bracket is installed at the lower part of the back support; the lumbar support member is connected to the lumbar support bracket, and the upper and lower ends of the lumbar support member are respectively rotatably matched with the lumbar support bracket; a sliding seat that can slide up and down along the lumbar support bracket is provided at the lower part of the lumbar support bracket, and the lower end of the lumbar support member is rotatably connected to the sliding seat; the lumbar support member can respond to the lifting movement of the sliding seat and correspondingly undergo elastic deformation in the longitudinal direction to change its own forward arch degree; The main support block is perpendicular to the side connection block, and the front and rear ends of the main support block protrude from the side connection block; a mounting socket is provided at the middle position of the inner side of each side back unit, and the side connection block is plugged into the mounting socket; The side back unit is a rectangular frame structure, and includes an inner rod and an outer rod spaced apart from each other. The elastic block is connected between the inner rods of the two side back units. The mounting socket is arranged at the middle position of the rear end of the inner rod. A connecting rear cover is provided at the rear end of each mounting socket, and the connecting rear cover is connected to the rear end of the mounting socket and can limit the plug-in block from being separated from the slot; the plug-in block is provided with a first limiting hole spaced longitudinally and a first connecting through hole distributed on both sides of the first limiting hole; a second limiting hole that coincides with the first limiting hole in front and back and a second connecting through hole that coincides with the first connecting through hole in front and back are correspondingly provided on the rear end surface of the mounting socket; a limiting column and a connecting steel buckle are correspondingly provided on the connecting rear cover, and the limiting column is configured to be sequentially inserted into the second limiting hole and the first limiting hole; the connecting steel buckle is a steel sheet that extends backward on all sides and has arc-shaped inverted teeth distributed on the periphery; The connecting steel buckle is configured to pass through the second connecting through hole and the first connecting through hole in sequence so that the arc-shaped inverted teeth are connected with the front and rear teeth of the plug block.

2. The ergonomic chair back according to claim 1, characterized in that: A gap is arranged at the middle position of the side connection block to form two upper and lower independent plug-in blocks, and two upper and lower spaced slots are correspondingly arranged on the inner side of the mounting socket, and the plug-in blocks are plugged and matched in the slots.

3. The ergonomic chair back according to claim 1, characterized in that: A support extending toward the center is provided on the outer rod of the side back unit, and a connecting seat is provided at the end of the support arm, which is connected to the support front and back; the elastic soft ring is clamped between the connecting seat and the support; a connecting column extending backward is provided at the rear end of the support; a mounting groove is provided at the rear end of the connecting seat; the connecting column passes through the elastic soft ring and the connecting seat backward in sequence and is located in the mounting groove; a damping rubber ring is also provided in the mounting groove, and a through hole is provided on the damping rubber ring for the connecting column to pass through; the damping rubber ring is embedded in the mounting groove and the connecting column is passed through the damping rubber ring, and the damping rubber ring is in close contact with the inner wall of the mounting groove; a gasket and a bolt are provided at the rear end of the connecting column, and the bolt passes through the gasket and is connected to the connecting column.

4. The ergonomic chair back according to claim 3, characterized in that: A first limiting protrusion protruding backward is provided at the end of the support, and a connecting column is arranged on the first limiting protrusion and extends backward; a first groove capable of cooperating with the first limiting protrusion is correspondingly provided at the front end of the elastic soft ring; a second limiting protrusion protruding forward is provided at the front end of the connecting seat; correspondingly, a second groove capable of cooperating with the second limiting protrusion is provided at the rear end of the elastic soft ring; and a connecting hole penetrating front and back for avoiding the connecting column is provided on the connecting seat, and the connecting hole is formed at the front end of the second limiting protrusion.

5. The ergonomic chair back according to claim 3, characterized in that: The elastic soft ring is engaged with the support, one of which is provided with an arc-shaped slot, and the other of which is provided with an arc-shaped block; the block is engaged in the slot to fix the elastic soft ring and the support circumferentially.

6. The ergonomic chair back according to claim 1, characterized in that: The lower part of the lumbar support bracket is provided with a longitudinal sliding support part, and the sliding seat is slidably connected to the front end of the sliding support part; a gear adjustment mechanism is provided between the sliding seat and the sliding support part; the gear adjustment mechanism includes an annular guide groove recessed on the end face of the sliding support part and a gear adjustment tooth arranged in the annular guide groove; a longitudinally spaced positioning groove is provided on one side of the gear adjustment tooth; a longitudinal adjustment member capable of deflecting left and right is provided in the sliding seat, and a pin is provided on the adjusting member, which protrudes and fits in the annular guide groove and can be engaged with the positioning groove; and the adjusting member always has a tendency to remain straight; during the rising process of the sliding seat, the pin moves up along the annular guide groove and can be engaged in the positioning groove in sequence under the self-centering force of the adjusting member; during the descending and resetting process of the sliding seat, the pin moves down along the annular guide groove and is reset.

7. The ergonomic chair back according to claim 6, characterized in that: The annular guide groove includes a longitudinal rising groove located on one side of the gear adjustment tooth having a positioning groove, and a longitudinal reset groove located on the other side of the gear adjustment tooth; during the rising process of the slide, the adjusting member deflects toward the side of the rising groove, and the latch moves up along the rising groove and can be sequentially inserted into the positioning grooves at different positions under the action of the adjusting member returning to the center; during the descending and resetting process of the slide, the adjusting member deflects from the rising groove to the side of the reset groove, and the latch descends along the reset groove and resets.

8. The ergonomic chair back according to claim 6 or 7, characterized in that: The slide seat is provided with a receiving groove for receiving the adjusting member; the lower end of the adjusting member is rotatably connected in the receiving groove, and the latch is arranged at the upper end of the adjusting member and is backwardly inserted into the annular guide groove; transversely arranged elastic members are respectively provided on both sides of the adjusting member; one end of each elastic member is connected to the side end of the adjusting member, and the other end is connected to the side wall of the receiving groove; the elastic member can undergo elastic deformation in response to the deflection movement of the adjusting member to provide elastic force for the adjusting member to return to a straight state again.

9. The ergonomic chair back according to claim 1, characterized in that: The lumbar support frame is detachably connected to the side lumbar support body; the lumbar support frame includes longitudinal strip side bars respectively located on the left and right sides, lower cross bars respectively arranged at the bottom of each strip side bar, and upper cross bars respectively arranged at the upper end of each strip side bar; the rear end of each side lumbar support body is correspondingly provided with an upper embedding groove, a side embedding groove and a lower embedding groove respectively capable of cooperating with the upper cross bar, the strip side bar and the lower cross bar.

10. The ergonomic chair back according to claim 1 or 9, characterized in that: The lumbar support frame is made of nylon, and the side lumbar support body is made of TPU soft rubber material.

11. The ergonomic chair back according to claim 9, characterized in that: The upper part of the lumbar support bracket is provided with ring arms extending to both sides respectively, and the left and right sides of the upper end of the lumbar support are respectively provided with upper rotating supports for rotationally connecting with the ring arms; two lower rotating supports for rotationally connecting with the sliding seat are provided at the middle position of the bottom of the lumbar support member, which are spaced left and right, and the sliding seat is clamped between the two lower rotating supports.

12. The ergonomic chair back according to claim 11, characterized in that: The upper rotating support includes a first upper rotating rib arranged on the outer side of the upper crossbar of the waist support frame and a second upper rotating rib extending backwards and arranged at a corresponding position on the upper end of the side waist support body; the first upper rotating rib overlaps with the second upper rotating rib.

13. The ergonomic chair back according to claim 11, characterized in that: The lower rotating support includes two rotating protrusions that are arranged at the lower end of the lumbar support frame, which are spaced apart from each other and protrude backward, and a lower rotating rib that is correspondingly arranged at a corresponding position at the lower end of the side lumbar support body and protrudes backward; a connecting groove with an opening at the front end is provided in the rotating protrusion, and the lower rotating rib is embedded in the connecting groove.

14. A chair, characterized by: Comprising a chair back as described in any one of claims 1-13.

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