Chair back and seat

Abstract

The present invention discloses a chair back and a seat, comprising a chair back assembly, a lumbar support arranged in the chair back assembly and a hand-held support plate exposed at the rear end of the chair back assembly; the chair back assembly is covered with a chair back cover cloth; a containing cavity is arranged inside the chair back assembly, the lumbar support is arranged in the containing cavity and the lumbar support presses against the front part of the chair back cover cloth to play a lumbar supporting role; a notch is arranged at the rear part of the chair back cover cloth; a longitudinal adjusting slide plate is connected between the hand-held support plate and the lumbar support, the adjusting slide plate is inserted into the containing cavity upward from the notch, and the upper end of the adjusting slide plate is connected to the lumbar support; the part of the adjusting slide plate exposed outside the chair back cover cloth is pressed against the rear part of the chair back cover cloth; the bottom of the adjusting slide plate is connected to the hand-held support plate, and the lumbar support can be driven to move synchronously by acting on the hand-held support plate to move up and down; and the hand-held support plate is pressed against the rear part of the chair back cover cloth, and the hand-held support plate can always cover the notch and the part of the adjusting slide plate exposed outside the chair back cover cloth.

Description

Technical Field

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

[0002] In modern life, there are more and more types of office furniture, and users have higher and higher functional requirements for office furniture. Among them, the comfort of office chairs plays a key role in the health of office users.

[0003] An office chair is a kind of seat with a backrest and armrests. The backrest on the chair is generally upright or inclined. When the user leans his back against the backrest, there will be a certain gap between the user's back waist and the backrest, and the back of the human body cannot be completely against the backrest, which reduces the support effect of the backrest on the back of the human body, thereby reducing the comfort of human use. In order to improve the riding comfort, a protruding pad is generally set on the back of the chair near the waist of the passenger, that is, the lumbar support; the lumbar support supports the waist of the passenger to reduce waist fatigue. And the current lumbar support basically has the function of lifting and adjusting, and can be adjusted in height according to user needs.

[0004] The Chinese utility model patent CN201921150190.X discloses "an office chair with adjustable lumbar support". It includes a seat and a backrest. The backrest includes a fixed plate with an opening in the middle and a lumbar support. The two sides of the fixed plate are respectively provided with an elastic pad and a support member perpendicular to the seat. The support member is provided with a vertical guide portion. One end of the lumbar support is slidably arranged on the guide portion through a connecting member, and the other end passes through the opening and abuts against the elastic pad; the guide portion is a strip through hole, and the end of the connecting member passes through the strip through hole and forms an adjustment portion; the support member is provided with a slide groove parallel to the guide portion, and a slider is provided in the slide groove; the adjustment portion is provided with a connecting block parallel to the slider, and the connecting block is connected to the slider through an elastic member. The lumbar support of the utility model can be adjusted up and down, front and back at will according to the different riding methods of the user, so that the lumbar support always supports the user's waist, and is highly practical. At the same time, it also has the characteristics of simple structure, convenient processing, flexible and precise adjustment, and long service life. The above structure is a common lumbar adjustment structure on existing office chairs; a longitudinal guide portion is provided on the backrest, and a longitudinal slide groove is provided on the guide portion; the lumbar support is slidably provided on the guide portion; although the lumbar support lifting and adjusting structure can achieve the lifting and adjusting of the lumbar support, the problem is that the lumbar support connection structure is completely exposed at the rear end of the backrest; one is that the structure of the guide portion is relatively abrupt, and the other is that the slide groove is longitudinally exposed at the rear end of the backrest, making the structure not simple and beautiful; interfering with the structural shape of the backrest itself.

[0005] The utility model of CN202020574266.8 relates to a swivel chair. It solves the problems that the existing technology has a small scope of application. The swivel chair includes a seat with a footrest mechanism, and a chair foot connected to the center of the bottom surface of the seat. A backrest assembly is connected to the rear side of the seat, and the backrest assembly includes a fixed support frame and a backrest outer frame fixed to the fixed support frame. The top of the fixed support frame is horizontally placed in the middle of the backrest outer frame. A lumbar support located inside the backrest outer frame is provided at the top of the fixed support frame. A T-shaped lumbar support frame is provided at the top of the fixed support frame close to a surface of the human body, and a position adjustment mechanism for adjusting the vertical height position of the T-shaped lumbar support frame is provided between the fixed support frame and the T-shaped lumbar support frame. The lumbar support and the T-shaped lumbar support frame are spaced apart from each other in the front and back. The top of the backrest outer frame is connected to a headrest support through a lifting control mechanism, and the top of the headrest support is connected to a headrest frame through a rotation control mechanism. The advantage of the utility model is that the scope of application is expanded. The lumbar support of this seat can also be adjusted, but it is obvious that the lumbar support is slidably connected to the support frame through a longitudinal lumbar support frame; and during the lifting and lowering adjustment of the lumbar support, the lumbar support frame will also be obviously exposed, affecting the aesthetic appearance of the structure.

[0006] In view of the above problems, the present invention is devoted to designing a simple and beautiful chair backrest, which can achieve a hidden lumbar support. Summary of the invention

[0007] The object of the present invention is to overcome the deficiencies existing in the above-mentioned prior art, and to provide a chair back and a seat; a lumbar support is arranged inside the chair back assembly, and the hand-held support plate is arranged at the rear end of the chair back assembly, and the two are connected by a longitudinal adjustment slide; thereby the lifting and lowering adjustment of the lumbar support can be controlled by acting on the hand-held support plate; and, the chair back assembly is covered with a chair back cover, and only a notch for inserting the adjustment slide is exposed on the rear side of the chair back cover, which does not affect the structural shape of the chair back assembly itself; and after the hand-held support plate is connected, it can just cover the notch and the adjustment slide, so that when looking from the rear end of the chair back assembly, only the hand-held support plate attached to its surface can be seen, making the structure very simple and beautiful, and the design is ingenious.

[0008] The technical solution of the present invention is achieved in this way:

[0009] A chair back comprises a chair back assembly, a lumbar support arranged in the chair back assembly and a hand-held support plate exposed at the rear end of the chair back assembly; the outer surface of the chair back assembly is covered with a chair back cover, and the chair back cover comprises a front part located in front of the chair back assembly and a rear part located at the back of the chair back assembly; a receiving cavity is arranged inside the chair back assembly, and the lumbar support is arranged in the receiving cavity and the lumbar support presses against the front part of the chair back cover to play a lumbar supporting role; a notch is arranged in the rear part of the chair back cover; a longitudinal adjusting device is connected between the hand-held support plate and the lumbar support. The adjusting slide plate is inserted upward into the accommodating cavity from the notch, and the upper end of the adjusting slide plate is connected to the lumbar support; the part of the adjusting slide plate exposed outside the seat back cover is in contact with the rear part of the seat back cover; the bottom of the adjusting slide plate is connected to the hand-held support plate, and the up and down movement of the hand-held support plate can drive the lumbar support to move synchronously to adjust its top waist position on the front part of the seat back cover; and the hand-held support plate is in contact with the rear part of the seat back cover, and the hand-held support plate can always cover the notch and the part of the adjusting slide plate exposed outside the seat back cover.

[0010] Preferably, the bottom end of the hand-held support plate is located below the bottom end of the adjustment slide plate; the hand-held support plate moves up and down along the chair back assembly so that the lumbar support has an upper adjustment position and a lower adjustment position; and when the lumbar support is in the lower adjustment position, the upper end of the hand-held support plate is located above the notch. The hand-held support plate is configured to be of sufficient height to ensure that the hand-held support plate can always cover the part of the adjustment slide plate exposed outside the chair back cover and the socket during the hand-held support plate sliding up and down along the chair back assembly, so that the rear end structure of the chair back assembly is beautiful.

[0011] Preferably, the accommodating cavity is provided on the back of the backrest assembly, and a cover plate for covering the accommodating cavity is connected to the rear end of the backrest assembly; a vertical downward socket corresponding to the notch position is provided on the cover plate, and the socket is connected to the accommodating cavity; the adjusting slide plate is inserted into the socket from the notch. The accommodating cavity is provided on the back of the backrest assembly to facilitate the installation of the lumbar support; the cover plate can cover the lumbar support and the accommodating cavity to achieve hidden installation of the lumbar support; a socket is provided on the cover plate so that the adjusting slide plate can be inserted into the socket just from the notch position on the backrest cover.

[0012] Preferably, the contour of the cover plate matches the contour of the accommodating cavity; and the cover plate includes an upper cover plate and a lower cover plate; the rear end surface of the upper cover plate protrudes backwards from the rear end surface of the lower cover plate; a flange is formed between the upper cover plate and the lower cover plate, and the socket is arranged at the middle position of the flange. By forming a flange between the upper cover plate and the lower cover plate, the socket can be arranged on the flange; and the hand-held support plate is connected to the lower cover plate, and the lower cover plate is designed to be thinner; so that the hand-held support plate will be closer to the chair back assembly, eliminating the gap.

[0013] Preferably, the cover plate is wrapped in the seat back cover, and the rear end surface of the upper portion of the cover plate is flush with the rear end surface of the seat back assembly, so that after the seat back cover is wrapped on the seat back assembly, the rear side of the seat back cover will not be uneven, so that the surface of the seat back cover is flat, the structural integrity is good, and the structure is beautiful.

[0014] Preferably, the lumbar support is slidably matched with the cover plate; a sliding mounting seat for connecting with the adjustment slide is provided at the upper end of the lumbar support; and sliders are provided at both ends of the sliding mounting seat, and longitudinal slide grooves are provided on both sides of the front end of the cover plate; the sliders are slidably matched in the slide grooves. The sliding mounting seat can be connected with the adjustment slide plate, so that the adjustment slide plate can drive the lumbar support to move; and the sliding mounting seat can also be slidably matched with the cover plate, so that the lumbar support and the cover plate can slide together; then the cover plate can not only cover the accommodating cavity, but also can further slide to support the lumbar support; it plays multiple roles.

[0015] Preferably, a slide seat is provided at the lower end of the lumbar support, and a longitudinal slide rail is provided at the middle position of the lower front end of the cover plate; the slide seat and the slide rail are slidably matched so that the slide seat can slide up and down along the slide rail. The upper and lower ends of the lumbar support are slidably matched with the cover plate, making the lumbar support slide more stably.

[0016] Preferably, a gear adjustment mechanism is provided between the adjustment slide and the cover plate; the gear adjustment mechanism comprises positioning slots arranged at intervals in the vertical direction and arranged on the left and right sides of the adjustment slide, and elastic clamps correspondingly arranged on the left and right sides of the adjustment slide on the cover plate and capable of engaging with the positioning slots. The cover plate can be elastically engaged with the adjustment slide, so that the adjustment slide has a good damping feel when it is raised or lowered, and the elastic clamp is engaged with the positioning slot, so that the lumbar support can stop at multiple adjustment gears.

[0017] Preferably, the lower end of the adjustment slide is provided with a connection block extending backward, and the bottom of the hand-held support plate is provided with a connection sleeve extending forward accordingly; the connection sleeve and the connection block are plugged in front and back so that the hand-held support plate and the adjustment slide plate are close to each other, and the hand-held support plate and the connection block are fixedly connected by screws. The hand-held support plate and the adjustment slide plate are tightly connected; the hand-held support plate and the adjustment slide plate are further connected; the adjustment slide plate is further hidden between the hand-held support plate and the chair back assembly; and the connection block is plugged in the connection sleeve, so that the connection is beautiful.

[0018] Preferably, a decorative back cover is provided outside the handheld support plate, which can further hide connection traces such as screws, make the surface of the handheld support plate smooth, and beautify the appearance.

[0019] Preferably, the backrest assembly includes a backrest frame and a backrest sponge; the backrest frame is a metal frame structure, and the backrest sponge is integrally foamed with the backrest frame; the accommodation cavity is formed at the rear end of the backrest sponge. The backrest frame can be foamed in a mold to form the backrest sponge, so that the backrest sponge can be directly formed into a shape with an accommodation cavity at the rear end, without the need to separately process and open the accommodation cavity, which makes processing and manufacturing more convenient.

[0020] Preferably, the lumbar support is pressed forward to act on the backrest sponge at the front end thereof, so that the user can feel the lumbar support effect when leaning on the chair back assembly.

[0021] Preferably, the chair back frame comprises a horizontal upper connecting cross bar and a lower connecting cross bar respectively exposed at the upper and lower ends of the accommodating cavity; the upper connecting cross bar and the lower connecting cross bar are respectively configured to be connected to the cover plate. The cover plate is connected to the metal chair back frame to ensure the connection strength.

[0022] Preferably, a hook-shaped support seat is provided at the upper end of the cover plate; the upper connecting crossbar is a round bar, and the support seat can be engaged with the upper connecting crossbar up and down; and the support seat can rotate around the upper connecting crossbar. Therefore, during installation, the cover plate can be directly engaged with the upper connecting crossbar from bottom to top, and then the cover plate can be further rotated; the connection is convenient and quick.

[0023] Preferably, a fixing plate is provided at the bottom of the cover plate, and the fixing plate is connected to the lower connecting cross bar by screws.

[0024] Preferably, along the height direction of the chair back, the accommodation cavity is formed in the middle of the chair back assembly, and the accommodation cavity passes through the chair back assembly front and back, and the accommodation cavity is formed between the front part of the chair back cover and the rear part of the chair back cover. As another embodiment, a part of the middle of the chair back assembly is hollowed out front and back, and after the chair back cover is put on, the accommodation cavity is surrounded, and after the adjustment slide plate is extended into the notch, it can be passed into the accommodation cavity and then connected to the lumbar support, and the lumbar support can directly press against the front part of the chair back cover.

[0025] Preferably, the chair back cover is made of opaque textile fabric or leather, so that the lumbar support has a hidden effect, giving the user a novel feeling.

[0026] Preferably, there is only one gap, and the width of the gap is 1.5CM-4CM. While satisfying the insertion and sliding of the adjustment slide, the gap is made as small as possible, and the appearance is not affected as much as possible; the chair back cover is as complete as possible.

[0027] Preferably, the notch is arranged in the middle of the width direction of the seat back, and from bottom to top, the notch is arranged at a height of one third to one half of the height of the rear part of the seat back cover. The notch is arranged in the middle of the seat back cover or in the lower middle position, so as to meet the position requirements of the lumbar support adjustment.

[0028] A seat comprises the seat back.

[0029] The design starting point, concept and beneficial effects of the present invention using the above technical solution are:

[0030] Firstly, the chair back of the present invention has a lumbar support arranged inside the chair back assembly, and the hand-held support plate is arranged at the rear end of the chair back assembly, and the two are connected by a longitudinal adjustment slide plate; thereby, the hand-held support plate is used to control the lifting and lowering adjustment of the lumbar support, so as to realize the hidden installation of the lumbar support; and, the chair back assembly is covered with a chair back cover, and only a notch for inserting the adjustment slide plate is exposed on the rear side of the chair back cover, which can be aesthetically pleasing and does not affect the structural shape of the chair back assembly itself; and the hand-held support plate can just cover the notch and the adjustment slide plate after being connected, so that from the rear end of the chair back assembly, only the hand-held support plate attached to its surface can be seen, making the structure very simple and beautiful, and the design is ingenious; and during the movement of the hand-held support plate, the adjustment slide plate and the notch will not be exposed; compared with the chair back lumbar support with the existing structure slide groove or connection structure exposed outside, the appearance of the chair back assembly is undoubtedly simpler and more advanced.

[0031] Secondly, a receiving cavity is provided at the rear end of the chair back assembly, and the lumbar support is installed in the receiving cavity; the receiving cavity is provided at the back of the chair back assembly, which is convenient for the installation of the lumbar support. Then, a cover plate for covering the receiving cavity is correspondingly connected to the rear end of the chair back assembly, and the cover plate can cover the lumbar support and the receiving cavity, so as to realize the hidden installation of the lumbar support; and a socket corresponding to the notch position is provided on the cover plate, and the socket is connected with the receiving cavity, so that the adjustment slide can be inserted into the socket from the notch of the chair back cover.

[0032] Furthermore, the waist support and the cover plate are slidably matched, and a gear adjustment mechanism for realizing elastic adjustment of the waist support is provided between the adjustment slide plate and the cover plate, so that the cover plate can not only cover the accommodating cavity, but also provide sliding support for the waist support, playing multiple roles.

[0033] Furthermore, the backrest assembly includes a backrest frame and a backrest sponge; the backrest frame is a metal frame structure, and the backrest sponge is integrally formed with the backrest frame by foaming; the accommodation cavity is formed at the rear end of the backrest sponge. The backrest frame can be foamed in a mold to form the backrest sponge, so that the backrest sponge can be directly formed into a shape with an accommodation cavity at the rear end, without the need to separately process and open the accommodation cavity, and the processing and manufacturing is more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the three-dimensional structure of the rear end of the chair back assembly in Example 1 of the present invention;

[0035] Figure 2 It is a schematic diagram of the three-dimensional structure of the side of the chair back assembly in Example 1 of the present invention;

[0036] Figure 3 It is a schematic diagram of the three-dimensional structure in which the socket is exposed outside the chair back assembly in Example 1 of the present invention;

[0037] Figure 4 It is a schematic diagram of the three-dimensional structure of the cover plate connected to the chair back assembly after the adjustment slide plate and the cover plate cooperate with each other in Example 1 of the present invention;

[0038] Figure 5 This is a schematic diagram of the three-dimensional structure in which the adjusting slide plate is exposed outside the chair back assembly in Example 1 of the present invention;

[0039] Figure 6 This is a schematic diagram of the three-dimensional structure of the cover plate and the hand-held support plate connected to the chair back assembly in Example 1 of the present invention;

[0040] Figure 7 This is a schematic diagram of the connection structure of the chair back assembly, the lumbar support, the cover plate and the hand-held support plate in Example 1 of the present invention;

[0041] Figure 8 It is a schematic diagram of the three-dimensional structure of the chair back frame in Example 1 of the present invention;

[0042] Fig. 9 It is a schematic diagram of the three-dimensional structure of the waist support, the cover plate and the hand-held support plate in Example 1 of the present invention.

[0043] Fig.10 It is a three-dimensional structural schematic diagram of the gear adjustment mechanism in Example 1 of the present invention;

[0044] Fig.11 It is a schematic diagram of the three-dimensional structure of the elastic clamp ring and the adjusting slide plate in embodiment 1 of the present invention;

[0045] Fig.12 This is a schematic diagram of the three-dimensional structure of the lumbar support connected to the adjustment slide plate in Example 1 of the present invention;

[0046] Fig.13 This is a schematic diagram of the three-dimensional structure of the connection between the handheld support plate and the adjusting slide plate in Example 1 of the present invention;

[0047] Fig.14 It is a schematic diagram of the three-dimensional structure of the lumbar support and the cover plate slidingly matched in Example 1 of the present invention;

[0048] Fig.15 It is a schematic diagram of the three-dimensional structure of the connection between the seat back assembly and the seat back cover in Example 1 of the present invention;

[0049] Fig.16 is a side sectional view of a chair back assembly in Embodiment 1 of the present invention;

[0050] Fig.17 It is a schematic diagram of the three-dimensional structure of the hand-held support plate in Example 1 of the present invention in the upper adjustment position and the lower adjustment position respectively.

[0051] The figures are marked as follows: seat back assembly 1; seat back frame 1A; backrest sponge 1B; lumbar support 2; decorative back cover 3; accommodating cavity 4; adjusting slide plate 5; positioning slot 5a; hand-held tray 6; socket 7; cover plate 8; upper cover plate 8a; lower cover plate 8b; side rod 9; upper connecting cross bar 10a; lower connecting cross bar 10b; supporting card seat 11; fixing plate 12; connecting part 13; flange 14; sliding mounting seat 15; slide groove 16; slider 17; slide seat 18; slide rail 19; elastic clamp 20; connecting seat 21; embedding groove 22; connecting column 23; limiting plate 24; seat back cover 25; front side part 25a; rear side part 25b; notch 25c; connecting block 26; connecting sleeve 27. DETAILED DESCRIPTION

[0052] 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.

[0053] 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.

[0054] 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.

[0055] The specific implementation methods of the present invention are as follows:

[0056] Example 1: Figure 1-17As shown, the present invention provides a chair back and a seat, wherein the chair back comprises a chair back assembly 1, a lumbar support 2 arranged in the chair back assembly 1, and a handheld support plate 6 exposed at the rear end of the chair back assembly 1. Among them, the outer surface of the seat back assembly 1 is covered with a seat back cover 25, and the seat back cover 25 includes a front part 25a located in front of the seat back assembly 1 and a rear part 25b located on the back of the seat back assembly 1; an accommodating cavity 4 is provided inside the seat back assembly 1, and the lumbar support 2 is arranged in the accommodating cavity 4 and the lumbar support 2 pushes the front part 25a of the seat back cover 25 to play a lumbar support role; a notch 25c is provided in the rear part 25b of the seat back cover 25; a longitudinal adjustment slide plate 5 is connected between the hand-held support plate 6 and the lumbar support 2; the adjustment slide plate 5 is upwardly inserted into the storage cavity 4 through the notch 25c, and the upper end of the adjustment slide plate 5 is configured to be connected to the lumbar support 2; and along the longitudinal direction, the part of the adjustment slide plate 5 exposed outside the seat back cover 25 is in contact with the rear part 25b of the seat back cover 25. The hand-held pallet 6 is exposed at the rear end of the seat back assembly 1 and is connected to the bottom of the adjusting slide 5. The up and down movement of the hand-held pallet 6 can drive the lumbar support 2 to move synchronously to adjust its top lumbar position on the front part 25a of the seat back cover 25; and the hand-held pallet 6 is also attached to the rear part 25b of the seat back cover 25, and the hand-held pallet 6 can always cover the notch 25c and the part of the adjusting slide 5 exposed outside the seat back cover 25.

[0057] Then, in the seat back of the present invention, the lumbar support 2 is arranged inside the seat back assembly 1 to realize a hidden installation, and the hand-held support plate 6 is arranged at the rear end of the seat back assembly 1, and the lumbar support 2 and the hand-held support plate 6 are connected by a longitudinal adjustment slide plate 5; thereby, the lifting and lowering adjustment of the lumbar support 2 can be controlled by acting on the hand-held support plate 6; and, the seat back assembly 1 is covered with a seat back cover 25, and only a notch 25c for inserting the adjustment slide plate 5 is exposed on the rear side part 25b of the seat back cover 25, and the structure is simple and beautiful; and after the hand-held support plate 6 is connected, the socket 7 and the adjustment slide plate 5 can always be covered, so that when looking from the rear end of the seat back assembly 1, only the hand-held support plate 6 attached to its surface can be seen, and the structural design is ingenious and full of high-end feeling.

[0058] like Figure 3-8As shown in 15-17, the accommodating cavity 4 is provided on the back of the backrest assembly 1. Specifically, the backrest assembly 1 includes a backrest frame 1A and a backrest sponge 1B; wherein the backrest frame 1A is a metal frame structure, and the backrest sponge 1B is integrally foamed with the backrest frame 1A; the accommodating cavity 4 is formed on the rear end surface of the backrest sponge 1B. Moreover, the backrest frame 1A can be foamed in a mold to form the backrest sponge 1B, so that the backrest sponge 1B can be directly formed into a shape with an accommodating cavity 4 at the rear end, without the need for additional processing to open the accommodating cavity 4, and the processing and manufacturing is more convenient; furthermore, the space size of the accommodating cavity 4 is larger than the size of the lumbar support 2, so that the lumbar support 2 can still be moved up and down and adjusted in the accommodating cavity 4. In addition, the lumbar support 2 will squeeze the back sponge 1B at its front end forward, so that it can push forward on the front part 25a of the back cover 25; ensuring that the user leans on the back assembly 1, and the lumbar support 2 can play a supporting role; by arranging the lumbar support 2 in the accommodating cavity 4, the lumbar support 2 is hidden. The overall structure of the back assembly 1 is made simpler and more beautiful.

[0059] Furthermore, a cover plate 8 for covering the accommodating cavity 4 is correspondingly connected to the rear end of the chair back assembly 1. The outline size of the cover plate 8 matches the outline size of the accommodating cavity 4, so that the accommodating cavity 4 can be covered, making the rear surface structure of the chair back assembly 1 smooth. Specifically, the chair back frame 1A includes side rods 9 respectively located on both sides, and an upper connecting cross bar 10a and a lower connecting cross bar 10b respectively connected between the two side rods 9 are provided at the middle position of the chair back frame 1A, and the upper connecting cross bar 10a and the lower connecting cross bar 10b are spaced apart from each other. And as Figure 6-8 As shown, after the backrest sponge 1B and the chair back frame 1A are integrally foamed, the upper connecting cross bar 10a is just exposed at the upper end of the accommodating cavity 4, and the lower connecting cross bar 10b is just exposed at the lower end of the accommodating cavity 4. The upper connecting cross bar 10a and the lower connecting cross bar 10b are respectively configured to be connected to the cover plate 8. The upper connecting cross bar 10a and the lower connecting cross bar 10b can not only increase the structural strength of the chair back frame 1A, but also just be exposed outside the accommodating cavity 4 to connect the cover plate 8; it kills two birds with one stone, and the design is ingenious. Further: Figure 7As shown, the upper end of the cover plate 8 is provided with a support card seat 11 arranged horizontally at intervals, and the support card seat 11 is in the shape of a hook, and the support card seat 11 extends forward and upward; and the support card seat 11 can be clamped and matched with the upper connecting cross bar 10a upward; then when installing, the cover plate 8 can be directly clamped with the upper connecting cross bar 10a from bottom to top, and the installation is convenient and quick. Furthermore, the upper connecting cross bar 10a is a metal round tube. After the upper connecting cross bar 10a is clamped with the support card seat 11, the support card seat 11 can also rotate around the upper connecting cross bar 10a; so that when the upper end of the cover plate 8 is clamped with the upper connecting cross bar 10a, the lower end of the cover plate 8 can be further rotated forward, so that the lower end of the cover plate 8 is further connected to the lower connecting cross bar 10b. A fixing plate 12 protruding downward is also provided at the middle position of the lower end of the cover plate 8; the lower connecting cross bar 10b is a metal cross bar, and the middle part of the lower connecting cross bar 10b is exposed at the lower end of the accommodating cavity 4 and forms a connecting portion 13, and the fixing plate 12 and the connecting portion 13 are connected and fixed by screws. Only the connecting portion 13 of the lower connecting cross bar 10b is exposed outside the accommodating cavity 4, so that the exposed part of the lower connecting cross bar 10b is less, which plays a connecting role and beautifies the appearance. When the fixing plate 12 and the connecting portion 13 are connected by screws, the installation of the cover plate 8 is completed, and the operation is very convenient and quick. After the cover plate 8 is connected, it can block the accommodating cavity 4; and the cover plate 8 is connected to the chair back frame 1A to ensure the connection strength.

[0060] like Figure 4-7 As shown, the cover plate 8 is also provided with a vertically downwardly facing socket 7 corresponding to the position of the notch 25c, and the socket 7 is connected with the accommodating cavity 4; the socket 7 is correspondingly provided on the cover plate 8, so that the adjustment slide plate 5 can be inserted into the socket 7 just through the notch 25c position on the seat back cover 25. Specifically: the cover plate 8 includes a cover plate upper portion 8a and a cover plate lower portion 8b; wherein the rear end surface of the cover plate upper portion 8a protrudes backward from the rear end surface of the cover plate lower portion 8b; so that a flange 14 is formed between the cover plate upper portion 8a and the cover plate lower portion 8b, and the socket 7 can be arranged at the middle position of the flange 14. The cover plate 8 is wrapped in the seat back cloth 25, and the rear end surface of the upper part 8a of the cover plate is flush with the rear end surface of the seat back assembly 1; so that after the seat back cloth 25 is wrapped on the seat back assembly 1, the rear part 25b of the seat back cloth 25 will not be uneven, so that the surface of the seat back cloth 25 is flat, the structural integrity is good, and the structure is beautiful. The adjustment slide plate 5 can thus be inserted into the socket 7 from bottom to top and connected with the lumbar support 2. Then, there is no need to set an exposed slide groove, and the adjustment slide plate 5 can move up and down along the socket 7. And after the handheld pallet 6 is connected, the handheld pallet 6 is located at the lower part 8b of the cover plate, and the lower part 8b of the cover plate is designed to be lighter and thinner; so that the handheld pallet 6 can be closer to the seat back assembly 1, eliminating the gap.

[0061] like Figure 6-16As shown, the upper end of the waist support 2 is provided with a sliding mounting seat 15, and the sliding mounting seat 15 is configured to be connected and fixed with the upper end of the adjustment slide plate 5 by screws, so that the adjustment slide plate 5 can move up and down to move the waist support 2. Figure 9-11 As shown, longitudinal slide grooves 16 are provided on both sides of the adjustment slide plate 5 at the upper end of the front end of the cover plate 8, and sliders 17 protruding outward are provided at both ends of the corresponding sliding mounting seat 15; so that the sliding mounting seat 15 can be used to connect with the adjustment slide plate 5, and the sliders 17 on both sides of the sliding mounting plate 15 can also slide in the slide grooves 16; so that the lumbar support 2 can slide stably in the vertical direction along the cover plate 8, and the sliding adjustment is smoother and more stable. Furthermore, as Fig.14 As shown, a slide seat 18 is also provided at the middle position of the lower end of the waist support 2, and a "T"-shaped slide groove is provided in the slide seat 18; a longitudinal "T"-shaped slide rail 19 is correspondingly provided at the middle position of the front end of the cover plate 8; the slide seat 18 and the slide rail 19 are slidably matched, so that the slide seat 18 can slide up and down along the slide rail 19; then the lower end of the waist support 2 is also slidably matched with the cover plate 8; so that the waist support 2 can stably slide up and down relative to the cover plate 8, so that the waist support 2 will not deviate left and right, slide smoothly and stably, and the sliding adjustment effect is better. The cover plate 8 can not only cover the accommodating cavity 4, but also provide sliding support for the waist support 2; it plays a dual role.

[0062] In addition, a gear adjustment mechanism is provided between the cover plate 8 and the adjustment slide 5, and the gear adjustment mechanism includes positioning slots 5a arranged at intervals in the vertical direction and arranged on the left and right sides of the adjustment slide 5; and an elastic clamp ring 20 correspondingly provided on the left and right sides of the adjustment slide 5 of the cover plate 8 and capable of engaging with the positioning slots 5a. The elastic clamp ring 20 is a circular rubber ring, and a connecting seat 21 is provided at the middle position of the front end surface of the cover plate 8 and is located on both sides of the adjustment slide 5. The adjustment slide 5 is clamped between the two connecting seats 21, which can limit the left and right deviation of the adjustment slide 5, so that the movement of the adjustment slide 5 is stable. The connecting seat 21 is provided with an embedding groove 22 for embedding the elastic clamp ring 20 and a connecting column 23 located at the center of the embedding groove 22; the elastic clamp ring 20 is directly sleeved on the connecting column 23 and embedded in the embedding groove 22; and after the elastic clamp ring 20 is embedded in the embedding groove 22, the side of the elastic clamp ring 20 close to the adjustment slide 5 will contact the adjustment slide 5. A limiting plate 24 is also connected to the front end of the two connecting seats 21. The two sides of the limiting plate 24 are connected to the connecting seats 21 by screws. The limiting plate 24 can limit the elastic clamping ring 20 from leaving the connecting seats 21. The positioning slot 5a is an arc slot, and the positioning slots 5a are arranged at intervals on both sides of the adjusting slide 5 in the longitudinal direction. When the adjusting slide 5 slides up and down relative to the cover plate 8, the elastic clamping rings 20 on both sides can be squeezed and deformed at the same time, so that the adjusting slide 5 has a good damping feeling during the sliding process. When the adjusting slide 5 is in a free state, the elastic clamping rings 20 on both sides are respectively engaged with the positioning slots 5a on both sides of the adjusting slide 5, so that the adjusting slide 5 stays at any adjustment position. The structural design is ingenious, and there is no need to set up a locking or unlocking device separately. By using the elastic deformation of the elastic clamping ring 20, the adjusting slide 5 can be controlled to slide or stay at any time, so that the height of the lumbar support 2 can be adjusted very conveniently.

[0063] like Figure 1-7 As shown, during installation, the lumbar support 2, the adjustment slide plate 5 and the cover plate 8 are assembled in advance, and then the cover plate 8 is connected to the seat back assembly 1. The seat back cover 25 is attached to the outer surface of the seat back assembly 1, and the seat back cover 25 covers the seat back assembly 1 and the cover plate 8; the notch 25c of the rear side portion 25b of the seat back cover 25 can just overlap with the socket 7 on the cover plate 8; Figure 3 , 5As shown, when the back cover 25 is wrapped on the back assembly 1, only the notch 25c of the rear part 25b of the back cover 25a is exposed, making the structure very simple and beautiful. Accordingly, the bottom of the adjustment slide 5 will be exposed outside the back cover 25, and the part of the adjustment slide 5 exposed outside the back cover 25 is in contact with the rear part 25b of the back cover 25a. A connection block 26 extending backward is provided at the bottom of the adjustment slide 5, and a connection sleeve 27 extending forward is correspondingly provided at the bottom of the front end of the hand-held support plate 6. When connected, the connection block 26 and the connection sleeve 27 are plugged in front and back, so that the hand-held support plate 6 and the adjustment slide 5 are closely together front and back; then screws are inserted from back to front on the hand-held support plate 6 and the connection block 26 to connect and fix the two. After the connection is completed, a decorative back cover 3 is also connected to the rear end of the hand-held support plate 6, which can further hide the connection traces such as screws, make the surface of the hand-held support plate 6 smooth, and beautify the appearance.

[0064] Furthermore, after the hand-held support plate 6 is connected, the two ends of the hand-held support plate 6 "embrace" the rear end of the seat back assembly 1, and the hand-held support plate 6 is also close to the rear part 25b of the seat back cover 25; thus, the seat back assembly 1, the adjustment slide plate 5 and the hand-held support plate 6 are close to each other front and back; and then the adjustment slide plate 5 will be hidden between the seat back cover 25 and the hand-held support plate 6. In addition, the bottom end of the hand-held support plate 6 is located below the bottom end of the adjustment slide plate 5, so that the bottom end of the adjustment slide plate 5 will never be exposed; Fig.17 As shown, the hand-held support plate 6 moves up and down along the backrest assembly 1 so that the lumbar support 2 has an upper adjustment position and a lower adjustment position; and when the lumbar support 2 is in the lower adjustment position, the hand-held support plate 6 is located at the lowest adjustment position; at this time, the upper end of the hand-held support plate 6 is still located above the notch 25c. Then the hand-held support plate 6 is configured to be of sufficient height to ensure that the hand-held support plate 6 can always cover the part of the adjustment slide plate 5 exposed outside the backrest cover 25 and the notch 25c during the process of sliding up and down along the backrest assembly 1, so that the rear end structure of the backrest assembly 1 is beautiful.

[0065] like Figure 1-3As shown in 15-17, the notch 25c is set in the middle of the width direction of the chair back, and from bottom to top, the notch 25c is set at a height of one-third to one-half of the height of the rear part 25b of the chair back cover 25. The notch 25c is set in the middle of the chair back cover 25 or in the lower middle position to meet the position requirements of the lumbar support adjustment. There is only one notch 25c, and the width of the notch 25c is 1.5CM-4CM; while meeting the insertion and sliding requirements of the adjustment slide 5, the notch 25c is made as small as possible, and the appearance is not affected as much as possible; the chair back cover 25 is as complete as possible. The chair back cover 25 is made of opaque textile fabric or leather; it has a good texture, and the lumbar support has a hidden effect, giving the user a novel feeling.

[0066] So that Figure 1-2 As shown, the lumbar support 2 is arranged inside the backrest assembly 1, and the hand-held support plate 5 is arranged outside the backrest assembly 1. Only the hand-held support plate 6 is exposed at the rear end of the backrest assembly 1; when controlling the lifting and lowering of the lumbar support 2, it is only necessary to act on the lifting and lowering of the hand-held support plate 6, and the hand-held support plate 6 will drive the adjustment slide plate 5 to lift and lower, thereby realizing the lifting and lowering adjustment of the lumbar support 2, which is very convenient to operate; and during the up and down adjustment process of the hand-held support plate 6, only the hand-held support plate 6 is always exposed at the rear end of the backrest assembly 1, and the adjustment slide plate 5 and the notch 25c are never exposed; it is more advanced to use. The structure of the backrest assembly 1 is very novel and simple, and will not interfere with the shape of the backrest assembly 1 itself, making the structure beautiful.

[0067] Embodiment 2: The difference between this embodiment and embodiment 1 is that: along the height direction of the chair back, the accommodation cavity 4 is formed in the middle of the chair back assembly 1, and the accommodation cavity 4 passes through the chair back assembly 1 from front to back (not shown), and the accommodation cavity 4 is formed between the front part 25a and the rear part 25b of the chair back cover. As another embodiment, a part of the middle of the chair back assembly 1 is hollowed out from front to back to form the accommodation cavity 4. After the chair back cover 25 is put on, it can just surround the front and rear ends of the accommodation cavity 4. After the adjustment slide plate 5 is extended into the notch 25c, it can pass into the accommodation cavity 4 and then connect with the lumbar support 2. The lumbar support 2 can directly press against the front part 25a of the chair back cover; the structure is very simple. The positioning of the lumbar support 2 can be achieved in the manner of embodiment 1, or other structures can be used. This is not the focus of this embodiment and will not be elaborated here.

Claims

1. A chair back, characterized in that: The utility model comprises a backrest assembly, a lumbar support arranged in the backrest assembly and a hand-held support plate exposed at the rear end of the backrest assembly; the outer surface of the backrest assembly is covered with a backrest cover cloth, and the backrest cover cloth comprises a front part located in front of the backrest assembly and a rear part located at the back of the backrest assembly; a receiving cavity is arranged inside the backrest assembly, and the lumbar support is arranged in the receiving cavity and the lumbar support is pressed against the front part of the backrest cover cloth to play a lumbar supporting role; a notch is arranged in the rear part of the backrest cover cloth; a longitudinal adjustment slide plate is connected between the hand-held support plate and the lumbar support , the adjusting slide plate is inserted upwardly into the accommodating cavity from the notch, and the upper end of the adjusting slide plate is connected to the lumbar support; the part of the adjusting slide plate exposed outside the seat back cover is in contact with the rear part of the seat back cover; the bottom of the adjusting slide plate is connected to the hand-held support plate, and the hand-held support plate is moved up and down to drive the lumbar support to move synchronously to adjust its top waist position on the front part of the seat back cover; and the hand-held support plate is in contact with the rear part of the seat back cover, and the hand-held support plate can always cover the notch and the part of the adjusting slide plate exposed outside the seat back cover; The accommodating cavity is opened on the back side of the chair back assembly, and a cover plate for covering the accommodating cavity is correspondingly connected to the rear end of the chair back assembly; a vertical downward socket corresponding to the position of the notch is provided on the cover plate, and the socket is connected with the accommodating cavity; the adjusting slide is inserted into the socket through the notch; the lumbar support is slidably matched with the cover plate; a sliding mounting seat for connecting with the adjusting slide is provided at the upper end of the lumbar support; a connecting block extending backward is provided at the lower end of the adjusting slide, and a connecting sleeve extending forward is correspondingly provided on the bottom of the hand-held support plate; the connecting sleeve and the connecting block are plugged in front and back so that the hand-held support plate and the adjusting slide plate are abutted against each other front and back.

2. The seat back according to claim 1, characterized in that: The bottom end of the handheld support plate is located below the bottom end of the adjustment slide plate; the handheld support plate is moved up and down along the chair back assembly so that the lumbar support has an upper adjustment position and a lower adjustment position; and when the lumbar support is in the lower adjustment position, the upper end of the handheld support plate is located above the notch.

3. The seat back according to claim 1, characterized in that: The contour of the cover plate matches the contour of the accommodating cavity; the cover plate includes an upper cover plate portion and a lower cover plate portion; the rear end surface of the upper cover plate portion protrudes backwards from the rear end surface of the lower cover plate portion; A flange is formed between the upper portion of the cover plate and the lower portion of the cover plate, and the socket is arranged at the middle position of the flange.

4. The seat back according to claim 3, characterized in that: The cover plate is covered in the seat back covering cloth, and the rear end surface of the upper portion of the cover plate is flush with the rear end surface of the seat back assembly.

5. The chair back according to claim 1, characterized in that: Slide blocks are respectively arranged at both ends of the sliding mounting seat, and longitudinal slide grooves are correspondingly arranged on both sides of the front end of the cover plate; the slide blocks are slidably fitted in the slide grooves.

6. The chair back according to claim 5, characterized in that: A sliding seat is arranged at the lower end of the waist support, and a longitudinal sliding rail is correspondingly arranged at the middle position of the lower front end of the cover plate; the sliding seat and the sliding rail are slidably matched so that the sliding seat can slide up and down along the sliding rail.

7. The chair back according to claim 1, characterized in that: A gear adjustment mechanism is also provided between the adjustment slide and the cover plate; the gear adjustment mechanism includes positioning slots arranged at intervals in the vertical direction and respectively arranged on the left and right sides of the adjustment slide, and elastic clamping rings correspondingly arranged on the left and right sides of the cover plate on the adjustment slide and capable of engaging with the positioning slots.

8. The chair back according to claim 1, characterized in that: The hand-held support plate is fixedly connected to the connecting block by screws.

9. The chair back according to claim 1, characterized in that: A decorative rear cover is also provided outside the handheld support plate.

10. The chair back according to claim 1, characterized in that: The seat back assembly comprises a seat back frame and a back sponge body; the seat back frame is a metal frame structure, and the back sponge body is integrally foamed with the seat back frame; the accommodating cavity is formed at the rear end of the back sponge body.

11. The chair back according to claim 10, characterized in that: The lumbar support presses forwardly to act on the backrest sponge body located at the front end thereof.

12. The seat back assembly according to claim 10, characterized in that: The chair back frame comprises a horizontal upper connecting cross bar and a lower connecting cross bar respectively exposed at the upper and lower ends of the accommodating cavity; the upper connecting cross bar and the lower connecting cross bar are respectively configured to be connected to the cover plate.

13. The chair back assembly according to claim 12, characterized in that: A hook-shaped supporting seat is provided at the upper end of the cover plate; the upper connecting cross bar is a round bar, and the supporting seat can be engaged with the upper connecting cross bar up and down; and the supporting seat can rotate around the upper connecting cross bar.

14. The seat back assembly according to claim 12, characterized in that: A fixing plate is provided at the bottom of the cover plate, and the fixing plate is connected to the lower connecting cross bar by screws.

15. The chair back according to claim 1, characterized in that: The accommodating cavity is formed in the middle of the seat back assembly along the height direction of the seat back, and the accommodating cavity passes through the seat back assembly front to back, and is formed between the front part of the seat back cover and the rear part of the seat back cover.

16. The chair back according to claim 1, characterized in that: The chair back cover is made of opaque textile cloth or leather.

17. The chair back according to claim 1, characterized in that: There is only one gap, and the width of the gap is 1.5CM-4CM.

18. The chair back according to claim 1 or 16, characterized in that: The notch is arranged at the middle position in the width direction of the chair back, and the notch is arranged at a position of one third to one half of the height of the rear part of the chair back cover from bottom to top.

19. A seat, characterized in that: Comprising a chair back as described in any one of claims 1-18.

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