Chair back mechanism capable of being flexibly adjusted

Abstract

The utility model relates to a flexibly adjustable chair back mechanism, which comprises a chair back framework, a connecting seat and a connecting assembly, one end of the chair back framework is provided with a shell structure, the shell structure is movably sleeved on the connecting seat, the connecting assembly comprises a connecting block and a plurality of groups of connecting rods, and the connecting rod is movably sleeved on the shell structure. The connecting block penetrates through the shell structure and is connected with the shell structure, the multiple sets of connecting rods are movably connected to the connecting block in a clamped mode, each set of connecting rod is rotationally connected with a rotating block, and the rotating blocks are used for being movably connected with the connecting base in a clamped mode. The utility model has the beneficial effects that the stepless and smooth lifting adjustment is realized while the stability is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of seat, concretely relates to a chair back mechanism that can be flexibly adjusted. BACKGROUND

[0002] In modern office, home and e-sports seat design, the adjustability of the chair back directly affects the user's use comfort and health experience. The traditional chair back adjusting mechanism fixes the chair back height through bolts, knobs or toothed structures, and the user needs to manually operate to adjust, which is cumbersome and difficult to achieve stepless adjustment. After long-term use, the locking mechanism is easy to loosen or wear, causing the chair back to shake and affecting stability. SUMMARY

[0003] The utility model aims at providing a chair back mechanism that can be flexibly adjusted, which ensures stability and realizes stepless and smooth lifting adjustment.

[0004] A chair back mechanism that can be flexibly adjusted, comprising a chair back framework, a connecting seat and a connecting assembly, the chair back framework has a housing structure at one end, the housing structure is movably sleeved on the connecting seat, the connecting assembly comprises a connecting block and a plurality of groups of connecting rods, the connecting block is provided in the housing structure and connected with the housing structure, a plurality of groups of connecting rods are movably connected to the connecting block, each group of connecting rods is rotatably connected with a rotating block, and the rotating block is used for movably connecting with the connecting seat.

[0005] In the above scheme, the connecting seat is used to connect the chair back framework and the seat of the seat, and the housing structure of the chair back framework is movably sleeved on the connecting seat through the connecting assembly, so that the chair back framework can be lifted according to the user's demand. The connecting block is used to install the connecting rod and the rotating block, and the rotating block is connected with the connecting seat by its own gravity. When the chair back framework is lifted, the rotating block rotates along the connecting rod under pressure, and the connecting seat and the rotating block are disconnected, so that the chair back framework can be freely lifted and lowered. The gravity self-locking property of the rotating block is used to automatically form a stable connection with the connecting seat when the chair back is stationary, without the need for additional operation or manual locking device, which not only ensures the safety of use, but also simplifies the structural complexity.

[0006] Further, a plurality of grooves are provided on the connecting seat, a plurality of step structures are provided in the grooves, the rotating block comprises a first protruding structure and a second protruding structure, a connecting shaft is provided on the first protruding structure, and the connecting shaft can abut on the step structure.

[0007] In the above scheme, the groove in the connecting seat can ensure that the thickness of the chair back skeleton is not increased, the step structure is used for cooperation and clamping with the connecting assembly, the connecting shaft arranged on the first protruding structure of the rotating block abuts on the step structure, so that the position of the connecting skeleton set on the connecting seat can be fixed, and when the first protruding structure is not subjected to pressure, the deflection position of the first protruding structure can be ensured by the gravity of the second protruding structure itself.

[0008] Further, one side adjacent to the connecting seat of the second protruding structure is arc-shaped.

[0009] In the above scheme, the arc-shaped one side adjacent to the connecting seat of the second protruding structure can ensure that the chair back skeleton does not interfere with the step structure of the connecting seat when the chair back skeleton is lifted, so that the smooth lifting of the chair back skeleton is ensured.

[0010] Further, the connecting block comprises a panel and a plurality of groups of mounting plates, one group of the mounting plates has two opposite mounting plates, a single mounting plate is provided with a first connecting hole and a second connecting hole, the first connecting hole is L-shaped, the second connecting hole is long-circular, and each group of connecting rods is movably connected with the first connecting hole and the second connecting hole on each group of the mounting plates.

[0011] In the above scheme, the mounting plate is the base plate of the first connecting hole and the second connecting hole, the panel ensures the stable connection of the mounting plate and the shell structure, one group of connecting rods has two, one connecting rod passes through two first connecting holes on the mounting plate, and the other connecting rod passes through two second connecting holes on the mounting plate, the first protruding structure of the rotating block is adjacent to the first connecting hole, and the second protruding structure is adjacent to the second connecting hole, when the rotating block is subjected to pressure, the connecting rod moves along the L-shaped first connecting hole and the long-circular second connecting hole, so as to realize the unlocking and clamping between the rotating block and the connecting seat.

[0012] Further, a plurality of windows are arranged on the shell structure, and the mounting plate passes through the windows.

[0013] In the above scheme, the window is arranged to enable the mounting plate to pass into the shell structure, so that the rotating block is connected with the connecting seat.

[0014] Further, a waist cushion assembly is further included, the movable seat of the waist cushion assembly passes through the chair back skeleton, the other side of the chair back skeleton away from the waist cushion assembly is embedded with a connecting plate, the connecting plate is movably connected with the chair back skeleton, and the movable seat is connected with the connecting plate.

[0015] In the above scheme, the waist cushion assembly is used for supporting the waist of a user, the connecting seat and the chair back skeleton are connected through the connecting plate, so that the movable connection between the waist cushion assembly and the chair back skeleton is realized, and the height of the waist cushion assembly can be adjusted as needed.

[0016] Further, the chair back framework is provided with a plurality of connecting columns, the connecting plate is provided with a plurality of long circular holes, the connecting columns pass through the long circular holes, and a long circular cover is arranged on each group of connecting columns.

[0017] In the above scheme, the connecting column can move along the long circular hole, so that the stability of the moving track of the waist cushion assembly can be ensured, and the long circular cover realizes the movable connection of the chair back framework and the connecting plate.

[0018] Further, one side of the connecting plate connected with the chair back framework is provided with a connecting groove, a plurality of protrusions are arranged on one side of the connecting groove, a clamping groove is arranged on the chair back framework, a clamping block is movably arranged in the clamping groove, and a protruding part on the clamping block is matched and clamped with the protrusions.

[0019] In the above scheme, the clamping block is movably arranged in the clamping groove, when the waist cushion assembly is moved, the protruding part on the clamping block is pressed and moves in the clamping groove, so that the clamping state between the protruding part and the protrusions is released, so that the height of the waist cushion assembly can be freely adjusted, and when the waist cushion assembly is not moved, the protruding part and the protrusions are clamped to ensure the stability of the waist cushion assembly.

[0020] Further, a chair back cover is further arranged on the chair back framework.

[0021] In the above scheme, the chair back cover covers the chair back framework, so that the overall appearance is more simple and beautiful, and the visual effect is not affected by the exposed mechanical structure.

[0022] The chair back mechanism with flexible adjustment has the beneficial effects of ensuring stability and realizing stepless and smooth lifting adjustment. The connecting seat is used for connecting the chair back framework and the seat of the chair, the shell structure of the chair back framework is movably sleeved on the connecting seat through the connecting assembly, so that the chair back framework can be lifted according to the user's demand, the connecting block is used for mounting the connecting rod and the rotating block, the rotating block is clamped with the connecting seat by its own gravity, when the chair back framework is lifted, the rotating block is pressed and rotates along the connecting rod, the connecting seat and the rotating block are unclamped, so that the chair back framework can be freely lifted and lowered, the gravity self-locking characteristic of the rotating block is utilized, the connecting seat is automatically and stably clamped with the rotating block when the chair back is stationary, no additional operation or manual locking device is needed, the use safety is ensured, and the structural complexity is simplified. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a whole schematic view of the chair back mechanism of an embodiment.

[0024] Figure 2 It is a schematic view of the connecting assembly, the waist cushion assembly and the chair back framework of an embodiment.

[0025] Figure 3An exploded view of a backrest mechanism according to an embodiment.

[0026] Figure 4 An exploded view of a connecting assembly according to an embodiment.

[0027] Figure 5 An exploded view of a connecting seat according to an embodiment.

[0028] Figure 6 An exploded view of a connecting plate according to an embodiment. Figure 4 An enlarged view of part A in FIG. 6.

[0029] Figure 7 An exploded view of a connecting plate according to an embodiment.

[0030] Figure 8 An exploded view of a connecting plate according to an embodiment.

[0031] Figure 9 An exploded view of a connecting plate according to an embodiment. Figure 8 An enlarged view of part B in FIG. 6.

[0032] BRIEF DESCRIPTION OF DRAWINGS 1. A backrest frame; 11. A housing structure; 111. A window; 12. A connecting post; 13. A clamping groove; 2. A connecting seat; 21. A recess; 22. A step structure; 3. A connecting assembly; 31. A connecting block; 311. A panel; 312. A mounting plate; 3121. A first connecting hole; 3122. A second connecting hole; 32. A connecting rod; 33. A rotating block; 331. A first protruding structure; 332. A second protruding structure; 333. A connecting shaft; 4. A lumbar pad assembly; 5. A connecting plate; 51. An oblong hole; 52. A connecting groove; 53. A protruding block; 6. An oblong cover; 7. A clamping block; 71. A protruding portion; 8. A backrest cover. DETAILED DESCRIPTION

[0033] A backrest mechanism according to the present application will be described in further detail below with reference to specific embodiments and the accompanying drawings.

[0034] As Figures 1 to 4As shown, in a preferred embodiment, the utility model discloses a chair back mechanism of flexible adjustment, including chair back framework 1, connecting seat 2 and connecting assembly 3, one end of chair back framework 1 is equipped with the casing structure 11, the casing structure 11 is movably sleeved on connecting seat 2, connecting assembly 3 includes connecting block 31 and several groups of connecting rod 32, connecting block 31 is arranged in casing structure 11 and is connected with casing structure 11, and several groups of connecting rod 32 are movably connected on connecting block 31, and each group of connecting rod 32 is rotatably connected with rotating block 33, and rotating block 33 is used for movably clamping with connecting seat 2. Connecting seat 2 is used for connecting chair back framework 1 and the seat of seat, and the casing structure 11 of chair back framework 1 is movably sleeved on connecting seat 2 through connecting assembly 3, so that chair back framework 1 can be lifted according to user's demand, connecting block 31 is used for installing connecting rod 32 and rotating block 33, and rotating block 33 is clamped with connecting seat 2 by its own gravity, when chair back framework 1 is lifted, rotating block 33 is rotated along connecting rod 32 under pressure, and connecting seat 2 and rotating block 33 are unclamped, so that chair back framework 1 can be freely lifted and lowered, the gravity self-locking characteristics of rotating block 33 are utilized, and when the chair back is stationary, it is automatically clamped with connecting seat 2 to form stable clamping, without additional operation or manual locking device, both the use safety and the structural complexity are simplified.

[0035] As shown in Figure 2 and Figure 5 In some embodiments, a plurality of grooves 21 are provided on the connecting seat 2, a plurality of step structures 22 are provided in the grooves 21, the rotating block 33 includes a first protruding structure 331 and a second protruding structure 332, a connecting shaft 333 is provided on the first protruding structure 331, and the connecting shaft 333 can abut on the step structure 22. The grooves 21 provided on the connecting seat 2 can ensure that the thickness of the chair back framework 1 is not increased, the step structures 22 are used for clamping with the connecting assembly 3, the connecting shaft 333 provided on the first protruding structure 331 of the rotating block 33 abuts on the step structure 22, so that the position of the connecting framework sleeved on the connecting seat 2 can be fixed, and when the first protruding structure 331 is not subjected to pressure, the gravity of the second protruding structure 332 can ensure the deflection position of the first protruding structure 331.

[0036] As shown in Figure 4 and Figure 6 In some embodiments, the side adjacent to the connecting seat 2 of the second protruding structure 332 is arc-shaped. The side adjacent to the connecting seat 2 of the second protruding structure 332 being arc-shaped can ensure that the chair back framework 1 does not interfere with the step structure 22 of the connecting seat 2 when being lifted, so that the lifting of the chair back framework 1 is smooth.

[0037] As shown in Figure 4 and Figure 6As shown in the drawings, in some embodiments, the connecting block 31 comprises a panel 311 and a plurality of sets of mounting plates 312, one set of mounting plates 312 having two opposite mounting plates 312, each mounting plate 312 being provided with a first connecting hole 3121 and a second connecting hole 3122, the first connecting hole 3121 being L-shaped, and the second connecting hole 3122 being oblong, each set of connecting rods 32 being movably connected to the first connecting hole 3121 and the second connecting hole 3122 on each set of mounting plates 312. The mounting plate 312 is the base plate of the first connecting hole 3121 and the second connecting hole 3122, and the panel 311 ensures the stable connection of the mounting plate 312 and the shell structure 11. One set of connecting rods 32 has two connecting rods 32, one connecting rod 32 passing through the two first connecting holes 3121 on the mounting plate 312, and the other connecting rod 32 passing through the two second connecting holes 3122 on the mounting plate. The first protruding structure 331 of the rotating block 33 is adjacent to the first connecting hole 3121, and the second protruding structure 332 is adjacent to the second connecting hole 3122. When the rotating block 33 is subjected to pressure, the connecting rod 32 moves along the L-shaped first connecting hole 3121 and the oblong second connecting hole 3122, thereby achieving the unlocking and clamping between the rotating block 33 and the connecting seat 2.

[0038] As shown in the drawings, Figure 3 In some embodiments, the shell structure 11 is provided with a plurality of windows 111, and the mounting plate 312 passes through the window 111. The window 111 is used to enable the mounting plate 312 to pass into the shell structure 11, so that the rotating block 33 is connected with the connecting seat 2.

[0039] As shown in the drawings, Figure 2 and Figure 3 In some embodiments, the chair back framework 1 is further provided with a waist pad assembly 4, the movable seat of the waist pad assembly 4 passing through the chair back framework 1, and the other side of the chair back framework 1 away from the waist pad assembly 4 being embedded with a connecting plate 5, the connecting plate 5 being movably connected with the chair back framework 1, and the movable seat being connected with the connecting plate 5. The waist pad assembly 4 is used to support the waist of the user, and the connecting plate 5 connects the connecting seat 2 and the chair back framework 1, thereby achieving the movable connection of the waist pad assembly 4 and the chair back framework 1, and the height of the waist pad assembly 4 can be adjusted as needed.

[0040] As shown in the drawings, Figure 2 and Figure 3 In some embodiments, the chair back framework 1 is provided with a plurality of sets of connecting columns 12, the connecting plate 5 is provided with a plurality of oblong holes 51, the connecting columns 12 pass through the oblong holes 51, and each set of connecting columns 12 is provided with an oblong cover 6. The connecting column 12 can move along the oblong hole 51, thereby ensuring the stability of the moving track of the waist pad assembly 4, and the oblong cover 6 achieves the movable connection of the chair back framework 1 and the connecting plate 5.

[0041] As shown in the drawings, Figures 7 to 9As shown in the drawings, in some embodiments, the side of the connecting plate 5 connected with the chair back framework 1 is provided with a connecting groove 52, one side of the connecting groove 52 is provided with a plurality of protrusions 53, the chair back framework 1 is provided with a clamping groove 13, a clamping block 7 is movably embedded in the clamping groove 13, and a protruding part 71 on the clamping block 7 is matched and clamped with the protrusions 53. The clamping block 7 is movably embedded in the clamping groove 13, when the waist cushion assembly 4 is moved, the protruding part 71 on the clamping block 7 is pressed and moved in the clamping groove 13, so that the clamping state between the protruding part 71 and the protrusions 53 is released, so that the height of the waist cushion assembly 4 can be freely adjusted, and when the waist cushion assembly 4 is not moved, the protruding part 71 and the protrusions 53 are clamped to ensure the stability of the waist cushion assembly 4.

[0042] As shown in the drawings, Figure 1 In some embodiments, the chair back cover 8 is further included, and the chair back cover 8 is covered on the chair back framework 1. The chair back cover 8 covers the chair back framework 1, so that the overall appearance is more simple and beautiful, and the visual effect is not affected by the exposed mechanical structure.

[0043] The working principle and process of the chair back mechanism capable of being flexibly adjusted are as follows: when the chair back framework 1 is lifted, the rotating block 33 is pressed and rotated along the connecting rod 32, the clamping between the connecting seat 2 and the rotating block 33 is released, so that the chair back framework 1 can be freely lifted and lowered, the gravity self-locking characteristic of the rotating block 33 is utilized, the rotating block 33 is automatically and stably clamped with the connecting seat 2 when the chair back is stationary, when the waist cushion assembly 4 is moved, the protruding part 71 on the clamping block 7 is pressed and moved in the clamping groove 13, so that the clamping state between the protruding part 71 and the protrusions 53 is released, so that the height of the waist cushion assembly 4 can be freely adjusted, and when the waist cushion assembly 4 is not moved, the protruding part 71 and the protrusions 53 are clamped to ensure the stability of the waist cushion assembly 4.

[0044] In the description of the present application, it should be understood that the terms such as "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0045] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0046] In the utility model, unless another definite provision and limitation, the term " install " " link " " connect " " fixed " and so on term should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be direct connection, also can pass through intermediate medium indirectly connect, can be two element inside's intercommunication or two element's mutual action relation.

[0047] Although the description of the utility model is combined with the above specific embodiment, it is obvious that many substitutions, modifications and changes can be made by the person skilled in the art according to the above content. Therefore, all such substitutions, improvements and changes are included in the spirit and scope of the appended claims.

Claims

1. A flexibly adjustable chair back mechanism, characterized in that, The chair back frame includes a backrest frame, a connecting seat, and a connecting assembly. One end of the backrest frame has a shell structure, which is movably fitted onto the connecting seat. The connecting assembly includes a connecting block and several sets of connecting rods. The connecting block passes through the shell structure and is connected to it. Several sets of connecting rods are movably engaged with the connecting block. Each set of connecting rods is rotatably connected to a rotating block, which is used to movably engage with the connecting seat.

2. The flexibly adjustable chair back mechanism according to claim 1, characterized in that, The connecting seat is provided with a plurality of grooves, and each of the grooves is provided with a plurality of stepped structures. The rotating block includes a first protrusion structure and a second protrusion structure. The first protrusion structure is provided with a connecting shaft, which can abut against the stepped structure.

3. The flexibly adjustable chair back mechanism according to claim 2, characterized in that, The second protrusion structure is arc-shaped on the side adjacent to the connecting seat.

4. The flexibly adjustable chair back mechanism according to claim 2, characterized in that, The connecting block includes a panel and several sets of mounting plates. Each set of mounting plates has two opposing mounting plates. Each mounting plate has a first connecting hole and a second connecting hole. The first connecting hole is L-shaped and the second connecting hole is oblong. Each set of connecting rods is movably connected to the first connecting hole and the second connecting hole on each set of mounting plates.

5. The flexibly adjustable chair back mechanism according to claim 4, characterized in that, The housing structure has several windows, and the mounting plate passes through the windows.

6. The flexibly adjustable chair back mechanism according to claim 1, characterized in that, It also includes a lumbar support assembly, the movable seat of which passes through the backrest frame, and a connecting plate is embedded on the other side of the backrest frame away from the lumbar support assembly. The connecting plate is movably connected to the backrest frame, and the movable seat is connected to the connecting plate.

7. The flexibly adjustable chair back mechanism according to claim 6, characterized in that, The chair back frame is provided with several sets of connecting columns, and the connecting plate is provided with several elongated oval holes. The connecting columns pass through the elongated oval holes, and each set of connecting columns is covered with an elongated oval cover.

8. The flexibly adjustable chair back mechanism according to claim 6, characterized in that, The connecting plate has a connecting groove on one side where it connects to the chair back frame. A plurality of protrusions are provided on one side of the connecting groove. The chair back frame has a slot, and a snap-fit ​​block is movably embedded in the slot. The protrusion on the snap-fit ​​block engages with the protrusion.

9. The flexibly adjustable chair back mechanism according to claim 1, characterized in that, It also includes a backrest cover, which is placed over the backrest frame.

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