Linkage mechanism and chair with adjustable chair back

Abstract

The utility model discloses a linkage mechanism and a chair with an adjustable chair back. The chair comprises a chair seat, a chair seat supporting piece, a chair back assembly, a connecting rod adjusting mechanism and a trigger switch, the connecting rod adjusting mechanism at least comprises a supporting rod, a chair back supporting piece, a linkage rod and a linkage mechanism; the linkage mechanism comprises a matching piece, a linkage piece and a hydraulic rod; the trigger switch is connected with the hydraulic rod; one end of the chair back supporting piece is hinged to the supporting rod; the matching piece is fixedly arranged on the chair back supporting piece; the end, close to the supporting rod, of the linkage rod is hinged to the supporting rod and the linkage piece; the other end of the linkage rod is connected to the chair back assembly, so that the chair back assembly can rotate relative to the supporting rod so as to be switched between the initial state and the forward leaning state, and therefore, a user can freely adjust the chair back according to the use requirements, the use requirements of different crowds are met, the universality is good, convenience is brought to use, and the practicability is high. And the hydraulic rod can realize continuous and stepless force output adjustment by adjusting internal air pressure.

Description

Technical Field

[0001] This utility model relates to the technology of chairs, and in particular to a linkage mechanism and an adjustable backrest seat. Background Technology

[0002] Chairs are an essential item in modern life, widely used in various companies, homes and other public places. The comfort of a chair is directly related to people's quality of work and life.

[0003] Existing chairs can be categorized by location into office chairs, study chairs, and conference chairs, and by fabric into linen chairs, mesh chairs, leather chairs, and anti-static chairs. Generally, existing chairs fall into two categories: fixed backrests and adjustable backrests. Chairs with fixed backrests, due to their non-adjustable backrests, are prone to causing back fatigue with prolonged use.

[0004] An existing technology discloses an adjustable backrest seat, including a seat configured to mount a cushion, a seat support assembly connected to the lower end of the seat, and a backrest bracket connected to the rear end of the seat. It also includes a torsion spring, a slider, an upper link, a lower link, and a backrest mounting bracket forming a four-bar linkage. A cantilever is provided between the four-bar linkage and the backrest bracket; the lower end of the cantilever is hinged to the four-bar linkage, and the upper end is rotatably connected to the backrest bracket. The slider is slidably connected to the backrest bracket, and a locking device is provided between the slider and the backrest bracket. During installation, pressing the torsion spring creates a pre-tension force, and the locking device locks the four-bar linkage to the initial backrest position. When the user sits in the seat, the locking device is released, and driven by the torsion spring's return force, the four-bar linkage moves, causing the backrest to extend forward until it contacts the user's lower back and provides support. However, using the torsion spring's return force as the driving force for the backrest movement has the following drawbacks:

[0005] For example, during the torsion process, due to the elastic deformation characteristics of its torsion spring, different users may require different support forces, such as the resistance when leaning back. Since the spring force is fixed, adjustment is troublesome.

[0006] Secondly, because the elasticity of torsion springs is fixed by the material and structure, they can only provide fixed or segmented force output, making it difficult to adapt to the personalized support needs of different users. The adjustment precision and flexibility are insufficient, which limits the adjustment angle of the seat back.

[0007] Therefore, a new technical solution needs to be researched to address the above problems. Utility Model Content

[0008] In view of this, the present invention addresses the deficiencies of the existing technology, and its main objective is to provide a linkage mechanism and an adjustable backrest seat. Through the design of the linkage adjustment mechanism, one end of the backrest support is hinged to a support rod; the mating component is fixed to the backrest support; one end of the linkage rod near the support rod is hinged to both the support rod and the linkage component; the other end of the linkage rod is connected to the backrest assembly, allowing the backrest assembly to rotate relative to the support rod to switch between an initial state and a forward-leaning state. Thus, users can freely adjust the backrest according to their needs, meeting the requirements of different users, offering good versatility and convenience. Furthermore, the hydraulic rod can achieve continuous, stepless force output adjustment by adjusting the internal air pressure, accurately matching the weight and adjustment angle of different users, thereby increasing the adjustment angle of the backrest assembly.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] A linkage mechanism includes:

[0011] The mating component includes at least a through-type linkage groove that extends along the length of the mating component.

[0012] The linkage component is provided with at least a sliding block and a linkage part, wherein the sliding block is movably disposed in the linkage groove;

[0013] The driving component has its output end hinged to the linkage part. The driving component can drive the linkage part to move so that the sliding block slides along the linkage groove.

[0014] As a preferred embodiment, the linkage groove has at least a first position and a second position, and the sliding block is movably disposed in the linkage groove so that the sliding block can be located at the first position or the second position in the linkage groove.

[0015] As a preferred embodiment, the linkage includes a first linkage rod and a second linkage rod, and the sliding block includes a first sliding portion and a second sliding portion, the first sliding portion and the second sliding portion being respectively disposed opposite to the corresponding first linkage rod and second linkage rod; wherein, the first sliding portion is provided with a first mating portion and a first mating groove at a distance, and the second sliding portion is provided with a second mating portion and a second mating groove at a distance, the first sliding portion being connected to the second sliding portion such that the first mating portion is engaged in the second mating groove, and the second mating portion is engaged in the first mating groove.

[0016] As a preferred embodiment, one side of the mating component is provided with a plug for insertion into the chair back support, and the plug is recessed with a mounting groove.

[0017] As a preferred embodiment, at least one end of the mating component is provided with a docking block for fixing to the chair back support.

[0018] As a preferred embodiment, the driving component is a hydraulic rod.

[0019] An adjustable backrest seat includes a seat, a seat support, a backrest assembly, a linkage adjustment mechanism, and a trigger switch for controlling the start and stop of a drive component; the seat is disposed on the seat support, and the linkage adjustment mechanism is connected to the seat support and located on one side of the seat.

[0020] The linkage adjustment mechanism includes at least a support rod, a chair back support, a linkage rod, and a linkage mechanism, wherein the linkage mechanism is any one of the linkage mechanisms described above;

[0021] The linkage mechanism includes a mating component, a linkage component, and a hydraulic rod; the trigger switch is connected to the hydraulic rod.

[0022] One end of the chair back support is hinged to the support rod; the mating part is fixed to the chair back support; one end of the linkage rod near the support rod is hinged to both the support rod and the linkage part; the other end of the linkage rod is connected to the chair back assembly so that the chair back assembly can rotate relative to the support rod to switch between the initial state and the forward tilting state.

[0023] As a preferred embodiment, in the initial state, the sliding block is located at the first position; in the forward tilting state, the hydraulic rod drives the linkage to move, causing the sliding block to slide from the first position to the second position, and the linkage rod forms a support forward, causing the chair back assembly to tilt forward.

[0024] As a preferred embodiment, the chair back support is provided with a plug groove, and an installation part is provided in the plug groove. When the mating part is fixed on the chair back support, the plug part is installed and positioned in the plug groove, so that the installation part and the installation groove cooperate with each other.

[0025] As a preferred embodiment, the support rod and the backrest support are respectively provided with a first placement groove and a second placement groove. The linkage rod includes a first linkage rod body and a second linkage rod body. The lower end of the first linkage rod body has a first mating part and a second mating part. The first mating part of the first linkage rod body is hinged to the linkage part. The second mating part of the first linkage rod body is hinged to the upper end of the second linkage rod body. The lower end of the second linkage rod body is hinged to the support rod and is at least partially disposed in the first placement groove.

[0026] Compared with the prior art, this utility model has significant advantages and beneficial effects. Specifically, as can be seen from the above technical solution, it mainly relies on the design of a linkage adjustment mechanism. This mechanism includes at least a support rod, a backrest support, a linkage rod, and a linkage mechanism. The linkage mechanism includes a mating component, a linkage component, and a hydraulic rod. The trigger switch is connected to the hydraulic rod. One end of the backrest support is hinged to the support rod. The mating component is fixed to the backrest support. One end of the linkage rod near the support rod is hinged to both the support rod and the linkage component. The other end of the linkage rod is connected to the backrest assembly, allowing the backrest assembly to rotate relative to the support rod to switch between an initial state and a forward-leaning state. Thus, users can freely adjust the backrest according to their needs, meeting the usage requirements of different groups, offering good versatility and convenience.

[0027] Secondly, there is the cooperation between the mating parts, the linkage parts, and the hydraulic rod. The mating parts have a through-hole linkage groove, and the sliding block of the linkage parts is movably disposed in the linkage groove. The output end of the hydraulic rod is hinged to the linkage part, and the driving part can drive the linkage parts to move so that the sliding block slides along the linkage groove. In this way, the hydraulic rod can achieve continuous and stepless force output adjustment by adjusting the internal air pressure, which can accurately match the weight and adjustment angle of different users, thereby increasing the adjustment angle of the chair back assembly.

[0028] Finally, hydraulic rods are relatively simpler to install than torsion springs, require less installation space, and can be installed in different ways depending on actual needs.

[0029] To more clearly illustrate the structural features and effects of this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0030] Figure 1 This is a perspective view of the linkage mechanism of an embodiment of the present utility model (the sliding block is located in the first position);

[0031] Figure 2 This is a perspective view of the linkage mechanism of an embodiment of the present utility model (the sliding block is located in the second position);

[0032] Figure 3 This is an exploded view of an embodiment of the present utility model;

[0033] Figure 4 This is a perspective view of an embodiment of the present utility model;

[0034] Figure 5 This is a cross-sectional view of an embodiment of the present invention (initial state of the chair back assembly);

[0035] Figure 6 This is an exploded view of an embodiment of the present utility model;

[0036] Figure 7 This is a cross-sectional view of an embodiment of the present invention (adjustment state of the chair back assembly).

[0037] Explanation of reference numerals in the attached diagram:

[0038] 1. Mating parts 2. Linkage parts

[0039] 11. Linkage slot; 12. First position

[0040] 13. Second position 14. Connecting part

[0041] 15. Mounting slot; 16. Connecting block

[0042] 21. Sliding block 22. Linkage part

[0043] 23. First linkage rod 24. Second linkage rod

[0044] 211. First sliding part; 212. Second sliding part

[0045] 213. First docking part; 214. First docking groove

[0046] 215. Second docking part; 216. Second docking groove

[0047] 3. Drive components

[0048] 4. Seat 5. Backrest assembly

[0049] 6. Linkage adjustment mechanism 7. Linkage mechanism

[0050] 8. Trigger switch

[0051] 61. Support rod 62. Chair back support

[0052] 63. Linkage rod

[0053] 611, First placement slot

[0054] 621. Connecting slot; 622. Mounting part

[0055] 623. Second placement slot

[0056] 631. First linkage rod; 632. Second linkage rod

[0057] 633. First Coordination Unit; 634. Second Coordination Unit. Detailed Implementation

[0058] Please refer to Figures 1 to 7 As shown, it illustrates the specific structure of an embodiment of the present invention.

[0059] In the description of this utility model, it should be noted that the directional terms such as "up", "down", "front", "back", "left", and "right" indicate the orientation and positional relationship based on the accompanying drawings or the orientation or positional relationship shown when wearing and using the device normally. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this utility model.

[0060] A linkage mechanism includes a mating part 1, a linkage part 2, and a driving part 3.

[0061] The mating component 1 includes at least a through-type linkage groove 11, which extends along the length of the mating component 1. Preferably, the linkage groove 11 has at least a first position 12 and a second position 13, and the sliding block 21 is movably disposed in the linkage groove 11 so that the sliding block 21 can be located at the first position 12 or the second position 13 in the linkage groove 11.

[0062] Preferably, one side of the mating component 1 is provided with a plug portion 14 for insertion into the chair back support 62, and the plug portion 14 is recessed with a mounting groove 15. Preferably, at least one end of the mating component 1 is provided with a mating block 16 for fixing to the chair back support 62.

[0063] The linkage 2 is provided with at least a sliding block 21 and a linkage part 22. The sliding block 21 is movably disposed in the linkage groove 11. Preferably, the linkage 2 includes a first linkage rod 6323 and a second linkage rod 6324. The sliding block 21 includes a first sliding part 211 and a second sliding part 212. The first sliding part 211 and the second sliding part 212 are respectively disposed opposite to the corresponding first linkage rod 6323 and second linkage rod 6324. The first sliding part 211 is provided with a first docking part 213 and a first docking groove 214 at intervals. The second sliding part 212 is provided with a second docking part 215 and a second docking groove 216 at intervals. The first sliding part 211 is connected to the second sliding part 212, such that the first docking part 213 is engaged in the second docking groove 216, and the second docking part 215 is engaged in the first docking groove 214.

[0064] The output end of the drive component 3 is hinged to the linkage part 22. The drive component 3 can drive the linkage component 2 to move, so that the sliding block 21 slides along the linkage groove 11. Preferably, the drive component 3 is a hydraulic rod (gas spring).

[0065] An adjustable backrest seat includes a seat 4, a seat 4 support, a backrest assembly 5, a linkage adjustment mechanism 6, and a trigger switch 8 for controlling the start and stop of a drive component 3; the seat 4 is disposed on the seat 4 support, and the linkage adjustment mechanism 6 is connected to the seat 4 support and located on one side of the seat 4.

[0066] The linkage adjustment mechanism 6 includes at least a support rod 61, a backrest support 62, a linkage rod 63, and a linkage mechanism 7, wherein the linkage mechanism 7 is the aforementioned linkage mechanism 7;

[0067] The linkage mechanism 7 includes a mating part 1, a linkage part 2, and a hydraulic rod; the trigger switch 8 is connected to the hydraulic rod; the trigger switch 8 is a push-button switch, which is connected to the hydraulic rod switch via a connecting rope. The user does not need to bend down to operate the control handle, but only needs to press the push-button switch set on the side to adjust the height of the seat 4 more flexibly.

[0068] One end of the chair back support 62 is hinged to the support rod 61; the mating part 1 is fixed to the chair back support 62; one end of the linkage rod 63 near the support rod 61 is hinged to the support rod 61 and the linkage part 2 respectively; the other end of the linkage rod 63 is connected to the chair back assembly 5 so that the chair back assembly 5 can rotate relative to the support rod 61 to switch between the initial state and the forward tilting state.

[0069] In the initial state, the sliding block 21 is located at the first position 12; in the forward tilting state, the hydraulic rod drives the linkage 2 to move, so that the sliding block 21 slides from the first position 12 to the second position 13, and the linkage rod 63 forms a support forward, so that the chair back assembly 5 tilts forward.

[0070] like Figure 7 As shown, when the backrest assembly 5 needs to be adjusted, the trigger switch 8 is pressed manually, and the hydraulic rod switch is pulled by the connecting rope. The hydraulic rod applies a thrust to the bottom of the linkage 2, so the linkage 2 pushes the sliding block 21 to slide in the linkage groove 11. When the backrest assembly 5 moves to the appropriate position, the trigger switch 8 is released and locked. Since the mating part 1 is fixed on the backrest support 62, the first mating part 633 of the first linkage rod 631 is hinged to the linkage part 22. When the sliding block 21 slides in the linkage groove 11, the backrest support 62 and the linkage rod 63 will move forward, causing the backrest assembly 5 to tilt forward.

[0071] Preferably, the backrest support 62 is provided with a insertion groove 621, and the insertion groove 621 is provided with an installation part 622. When the mating part 1 is fixed on the backrest support 62, the insertion part 14 is installed and positioned in the insertion groove 621, so that the installation part 622 and the installation groove 15 cooperate with each other.

[0072] Preferably, the support rod 61 and the backrest support member 62 are respectively provided with a first placement groove 611 and a second placement groove 623. The linkage rod 63 includes a first linkage rod body 631 and a second linkage rod body 632. The lower end of the first linkage rod body 631 has a first mating part 633 and a second mating part 634. The first mating part 633 of the first linkage rod body 631 is hinged to the linkage part 22, and the second mating part 634 of the first linkage rod body 631 is hinged to the upper end of the second linkage rod body 632. The lower end of the second linkage rod body 632 is hinged to the support rod 61 and is at least partially disposed in the first placement groove 611. A lumbar support assembly is also connected to the backrest assembly 5, and the lumbar support assembly can be flipped up and down to be connected to the backrest assembly 5.

[0073] The key design feature of this utility model lies in its linkage adjustment mechanism. This mechanism includes at least a support rod, a backrest support, a linkage rod, and a linkage mechanism. The linkage mechanism includes a mating component, a linkage component, and a hydraulic rod. A trigger switch is connected to the hydraulic rod. One end of the backrest support is hinged to the support rod. The mating component is fixed to the backrest support. One end of the linkage rod near the support rod is hinged to both the support rod and the linkage component. The other end of the linkage rod is connected to the backrest assembly, allowing the backrest assembly to rotate relative to the support rod to switch between an initial state and a forward-leaning state. This allows users to freely adjust the backrest according to their needs, meeting the requirements of different users, offering good versatility and convenience.

[0074] Secondly, there is the cooperation between the mating parts, the linkage parts, and the hydraulic rod. The mating parts have a through-hole linkage groove, and the sliding block of the linkage parts is movably disposed in the linkage groove. The output end of the hydraulic rod is hinged to the linkage part, and the driving part can drive the linkage parts to move so that the sliding block slides along the linkage groove. In this way, the hydraulic rod can achieve continuous and stepless force output adjustment by adjusting the internal air pressure, which can accurately match the weight and adjustment angle of different users, thereby increasing the adjustment angle of the chair back assembly.

[0075] Finally, hydraulic rods are relatively simpler to install than torsion springs, require less installation space, and can be installed in different ways depending on actual needs.

[0076] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the technical scope of the present utility model. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A linkage mechanism characterised in that: The utility model relates to a chair backrest support device, comprising: a fitting piece, which at least comprises a linkage groove arranged through, the linkage groove is arranged along the length direction of the fitting piece; a linkage piece, which at least is provided with a sliding block and a linkage part, the sliding block is movably arranged in the linkage groove; a driving piece, the output end of the driving piece is hinged to the linkage part, the driving piece can drive the linkage piece to move, so that the sliding block slides along the linkage groove.

2. The linkage mechanism of claim 1, wherein: The linkage groove at least has a first position and a second position, the sliding block is movably arranged in the linkage groove, so that the sliding block can be located at the first position or the second position in the linkage groove.

3. The linkage of claim 1, wherein: The linkage piece comprises a first linkage rod and a second linkage rod, the sliding block comprises a first sliding part and a second sliding part, the first sliding part and the second sliding part are respectively arranged on the corresponding first linkage rod and second linkage rod; wherein, the first sliding part is respectively provided with a first docking part and a first docking groove at intervals, the second sliding part is respectively provided with a second docking part and a second docking groove at intervals, the first sliding part is connected to the second sliding part, so that the first docking part is clamped in the second docking groove, and the second docking part is clamped in the first docking groove.

4. The linkage of claim 1, wherein: One side of the fitting piece is provided with an insertion part for inserting on the chair backrest support piece, the insertion part is concavely provided with a mounting groove.

5. The linkage of claim 1, wherein: At least one end of the fitting piece is provided with a docking block for being fixed on the chair backrest support piece.

6. The linkage of claim 1, wherein: The driving piece is a hydraulic rod.

7. A chair with adjustable backrest, characterized in that: The utility model relates to a chair backrest support device, comprising: a seat, a seat support piece, a chair backrest assembly, a connecting rod adjusting mechanism and a trigger switch for controlling the start and stop of the driving piece; the seat is arranged on the seat support piece, and the connecting rod adjusting mechanism is connected to the seat support piece and located on one side of the seat; The connecting rod adjusting mechanism at least comprises a support rod, a chair backrest support piece, a linkage rod and a linkage mechanism, and the linkage mechanism is the linkage mechanism in any one of claims 1 to 6; The linkage mechanism comprises a fitting piece, a linkage piece and a hydraulic rod; the trigger switch is connected with the hydraulic rod; 8. The seat with adjustable backrest according to claim 7, characterized in that: One end of the chair backrest support piece is hinged to the support rod; the fitting piece is fixed on the chair backrest support piece; one end of the linkage rod close to the support rod is respectively hinged to the support rod and the linkage piece; the other end of the linkage rod is connected to the chair backrest assembly, so that the chair backrest assembly can rotate relative to the support rod to switch between an initial state and a forward-leaning state.

9. The seat with adjustable backrest according to claim 7, characterized in that: In the initial state, the sliding block is located at the first position; in the forward-leaning state, the hydraulic rod drives the linkage piece to move, so that the sliding block slides from the first position to the second position, and the linkage rod forms a support towards the front, so that the chair backrest assembly inclines forward. The chair backrest support piece is provided with an insertion groove, the insertion groove is provided with a mounting part, when the fitting piece is fixed on the chair backrest support piece, the insertion part is positioned in the insertion groove, so that the mounting part and the mounting groove cooperate with each other.

10. The seat with adjustable backrest according to claim 7, characterized in that: The support rod and the back support are respectively provided with a first placing groove and a second placing groove, the linkage rod comprises a first linkage rod body and a second linkage rod body, the lower end of the first linkage rod body is provided with a first matching part and a second matching part, the first matching part of the first linkage rod body is hingedly connected to the linkage part, the second matching part of the first linkage rod body is hingedly connected to the upper end of the second linkage rod body, and the lower end of the second linkage rod body is hingedly connected to the support rod and at least partially arranged in the first placing groove.

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