Chair with backrest angle adjusting group

Abstract

The utility model relates to the technical field of seats, in particular to a chair with a backrest angle adjusting group, which comprises a seat, a backrest and an adjusting mechanism, a first hinge groove is arranged on the lower side of the rear portion of the seat, and a second hinge groove is arranged at the bottom of the backrest. The adjusting mechanism comprises a pivotal shaft, the two ends of the pivotal shaft are rotationally connected into the second hinge grooves, and the two sides of the pivotal shaft are sleeved with connecting arms; the free ends of the two connecting arms are rotationally connected with a linkage shaft; the two ends of the linkage shaft are rotationally connected with L-shaped driving arms. A cylinder body of the linear actuator is hinged to the lower portion of the side, away from the fixing shaft, of the first hinge groove, and the end of a telescopic rod is fixed to an actuator connecting sleeve; by means of automatic backrest angle adjustment, flexible caster lifting and self-locking functions, reasonable component structure design and ergonomic controller arrangement, the effects of being convenient to adjust, high in comfort, diversified in function, stable in structure and convenient and fast to operate are achieved.

Description

Technical Field

[0001] This utility model relates to the field of seating technology, and specifically discloses a chair with adjustable backrest angle. Background Technology

[0002] In office and home settings, chairs are a common form of seating, and their comfort and functionality are of paramount importance. Traditional chairs often have fixed backrest angles, making it difficult to meet the personalized needs of different users in various scenarios. For example, while working, users may need to maintain an upright posture, and during rest, they may prefer a reclined backrest for relaxation. Some chairs with adjustable backrests often have complex adjustment mechanisms that are inconvenient to operate, resulting in less smooth and stable adjustments, and a limited range of adjustment angles, failing to provide diverse and comfortable sitting postures. Furthermore, traditional chairs also have shortcomings in terms of movement and stability. Casters often lack height adjustment and self-locking functions, limiting their use and making them prone to sliding, which negatively impacts the user experience.

[0003] Therefore, there is an urgent need for a chair with a reasonable structure, convenient adjustment, and multiple functions to solve the above problems. Utility Model Content

[0004] This utility model proposes a chair with a backrest angle adjustment mechanism. By setting up an adjustment mechanism and using a linear actuator to drive the drive arm, the backrest angle can be adjusted, providing a basic framework for the development of subsequent claims.

[0005] This utility model is implemented as follows: a chair with a backrest angle adjustment group includes a seat, a backrest and an adjustment mechanism. The lower rear side of the seat is provided with a first hinge groove, and the bottom of the backrest is provided with a second hinge groove.

[0006] The adjustment mechanism includes:

[0007] The pivot shaft is rotatably connected at both ends to the second hinge groove;

[0008] A pair of symmetrical connecting arms are fitted onto both sides of the pivot shaft;

[0009] The linkage shaft is rotatably connected to the free ends of the two connecting arms at both ends;

[0010] A pair of L-shaped drive arms, with the long arm end rotatably connected to the end of the linkage shaft, and the corners rotatably connected to the first hinge slot of the seat through a fixed shaft;

[0011] The drive shaft is rotatably connected at both ends to the short arm ends of the two drive arms;

[0012] Actuator connecting sleeve, fitted onto the middle of the drive shaft;

[0013] A linear actuator, wherein the cylinder body is hinged to the lower side of the first hinge groove away from the fixed shaft, and the end of the telescopic rod is fixed to the actuator connecting sleeve;

[0014] The backrest rotates around a pivot axis, and the linear actuator drives the drive arm to rotate around a fixed axis via a drive shaft. The drive arm pushes the connecting arm via a linkage shaft to achieve backrest angle adjustment.

[0015] As a preferred embodiment of the present invention, a chair with an adjustable backrest angle is provided at the rear of the seat and a second hinge seat is provided at the bottom of the backrest. The two are hinged together by a pin to form the second hinge groove.

[0016] As a preferred embodiment of the present invention, a chair with adjustable backrest angle is provided on both sides of the seat, and at least one armrest is equipped with a controller, which is provided with a control switch and electrically connected to a linear actuator.

[0017] As a preferred embodiment of the present invention, a chair with an adjustable backrest angle is provided, wherein the bottom of the seat is connected to the base via legs, and the bottom of the base is provided with caster assembly.

[0018] As a preferred embodiment of the chair with adjustable backrest angle according to this utility model, the caster assembly includes:

[0019] The accommodating cavity is located at the bottom of the base;

[0020] Self-locking casters are provided within the accommodating cavity;

[0021] The wheel lifting mechanism has its top fixed to the top wall of the accommodating cavity and its bottom connected to a self-locking universal wheel, which is used to drive the self-locking universal wheel to lift.

[0022] The controller is electrically connected to the lifting mechanism.

[0023] As a preferred embodiment of this utility model of a chair with adjustable backrest angle, the linear actuator or wheel lifting mechanism is an electric push rod or a pneumatic cylinder.

[0024] As a preferred embodiment of the chair with adjustable backrest angle according to this utility model, the armrest is T-shaped, and the controller is embedded in the top surface of the horizontal extension of the armrest.

[0025] The beneficial effects of this utility model are:

[0026] The backrest angle is automatically adjusted via a controller and linear actuator, eliminating the need for manual adjustment. The simple and convenient operation allows for quick adjustment to a comfortable backrest angle. The adjustable backrest angle caters to the individual needs of different users in various scenarios, providing better back support, effectively relieving fatigue, and improving seating comfort. The caster assembly features height adjustment and self-locking functions, allowing the chair to flexibly switch between mobile and stationary states, making it suitable for various usage scenarios such as office work, rest, and meetings, thus expanding the chair's versatility. Attached Figure Description

[0027] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0028] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0029] Figure 2 for Figure 1 A schematic diagram of the AA-direction cross-section structure.

[0030] Figure 3 for Figure 2 A magnified structural diagram at point B in the middle.

[0031] The markings in the diagram are: 1. Seat; 2. Backrest; 3. Adjustment mechanism; 4. First hinge slot; 5. Second hinge slot; 6. Pivot shaft; 7. Connecting arm; 8. Linkage shaft; 9. Drive arm; 10. Fixed shaft; 11. Drive shaft; 12. Actuator connecting sleeve; 13. Linear actuator; 14. First hinge seat; 15. Second hinge seat; 16. Pin shaft; 17. Armrest; 18. Controller; 19. Control switch; 20. Support leg; 21. Base; 22. Caster assembly; 23. Receiving cavity; 24. Self-locking caster wheel; 25. Wheel lifting mechanism. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings and specific embodiments to aid in understanding its content. Unless otherwise specified, the methods used in this invention are conventional methods; the raw materials and apparatus used, unless otherwise specified, are conventional commercially available products.

[0033] Please see Figure 1-3 A chair with a backrest angle adjustment mechanism includes a seat 1, a backrest 2 and an adjustment mechanism 3. The lower rear side of the seat 1 is provided with a first hinge groove 4, and the bottom of the backrest 2 is provided with a second hinge groove 5.

[0034] Adjustment mechanism 3 includes:

[0035] The pivot shaft 6 is rotatably connected at both ends to the second hinge groove 5;

[0036] A pair of symmetrical connecting arms 7 are fitted on both sides of the pivot shaft 6;

[0037] The linkage shaft 8 is rotatably connected at both ends to the free ends of the two connecting arms 7;

[0038] A pair of L-shaped drive arms 9, with the long arm end rotatably connected to the end of the linkage shaft 8, and the corner is rotatably connected to the first hinge groove 4 of the seat 1 via the fixed shaft 10.

[0039] The drive shaft 11 is rotatably connected at both ends to the short arm ends of the two drive arms 9;

[0040] Actuator connecting sleeve 12 is fitted onto the middle of drive shaft 11;

[0041] The linear actuator 13 has its cylinder body hinged to the lower side of the first hinge groove 4 away from the fixed shaft 10, and the end of the telescopic rod is fixed to the actuator connecting sleeve 12.

[0042] The backrest 2 rotates around the pivot axis 6, and the linear actuator 13 drives the drive arm 9 to rotate around the fixed axis 10 through the drive shaft 11. The drive arm 9 pushes the connecting arm 7 through the linkage shaft 8 to realize the angle adjustment of the backrest 2.

[0043] In this embodiment: when the user needs to adjust the angle of the backrest 2, they press the corresponding control switch 19 on the controller 18, and the telescopic rod of the linear actuator 13 begins to extend and retract; if the telescopic rod extends, it drives the drive shaft 11 to rotate, and the drive shaft 11 drives the drive arm 9 to rotate clockwise around the fixed shaft 10. The drive arm 9 pushes the connecting arm 7 through the linkage shaft 8, and the connecting arm 7 drives the pivot shaft 6 to rotate, causing the backrest 2 to tilt backward; if the telescopic rod retracts, the drive shaft 11 drives the drive arm 9 to rotate counterclockwise around the fixed shaft 10, and the backrest 2 returns to its forward position; when the user needs to move the chair, they press the switch on the controller 18 to control the wheel lifting mechanism 25, and the wheel lifting mechanism 25 works, lowering the self-locking casters 24, allowing the chair to move flexibly via the casters; when the chair needs to be fixed in position, the switch is operated again, and the wheel lifting mechanism 25 raises the self-locking casters 24, so that the base 21 under the chair contacts the ground, achieving fixation;

[0044] The backrest 2 has an adjustable angle range of 90°-135°, and the linear actuator 13 has a stroke of 100-150mm.

[0045] As a technical optimization of this utility model, the seat 1 is provided with a first hinge seat 14 at the rear and the backrest 2 is provided with a second hinge seat 15 at the bottom. The two are hinged together by a pin 16 to form a second hinge groove 5.

[0046] In this embodiment: by setting a first hinge seat 14 and a second hinge seat 15, and forming a second hinge groove 5 by hinge with a pin 16, the connection between the backrest 2 and the seat 1 is made more stable, ensuring the stability and reliability of the backrest 2 during the adjustment process.

[0047] As a technical optimization of this utility model, the seat 1 is provided with armrests 17 on both sides, and at least one armrest 17 is equipped with a controller 18. The controller 18 is provided with a control switch 19 and is electrically connected to the linear actuator 13.

[0048] In this embodiment, a controller 18 is embedded in the armrest 17 of the chair, which allows the user to easily operate the linear actuator 13 while seated, thereby adjusting the angle of the backrest 2 and improving the convenience and comfort of use.

[0049] As a technical optimization of this utility model, the bottom of the seat 1 is connected to the base 21 via the support legs 20, and the bottom of the base 21 is provided with a caster assembly 22.

[0050] In this embodiment: the base 21 is connected by the support legs 20, and the bottom of the base 21 is provided with caster assembly 22, which enables the chair to move and facilitates movement between different positions, thus expanding the chair's range of use.

[0051] As a technical optimization of this utility model, the caster assembly 22 includes:

[0052] The receiving cavity 23 is located at the bottom of the base 21;

[0053] The self-locking caster wheel 24 is located inside the receiving cavity 23;

[0054] The wheel lifting mechanism 25 is fixed at the top of the accommodating cavity 23 and connected to the bottom of the self-locking universal wheel 24 for driving the self-locking universal wheel 24 to lift.

[0055] The controller 18 is electrically connected to the lifting mechanism.

[0056] In this embodiment, the linear actuator 13 and the wheel lifting mechanism 25 can be electric push rods or pneumatic cylinders, providing specific choices for actual production and application, and ensuring the stability and reliability of the adjustment process.

[0057] As a technical optimization of this utility model, the linear actuator 13 or the wheel lifting mechanism 25 is an electric push rod or a pneumatic cylinder.

[0058] In this embodiment, the linear actuator 13 and the wheel lifting mechanism 25 can be electric push rods or pneumatic cylinders, providing specific choices for actual production and application, and ensuring the stability and reliability of the adjustment process.

[0059] As a technical optimization of this utility model, the handrail 17 is T-shaped, and the controller 18 is embedded in the top surface of the horizontal extension of the handrail 17.

[0060] In this embodiment, the backrest angle 2 is automatically adjusted by the controller 18 and the linear actuator 13. The user does not need to manually adjust it, the operation is simple and convenient, and the user can quickly adjust to a comfortable backrest angle 2.

[0061] Working principle and usage process of this utility model:

[0062] When the user needs to adjust the backrest 2 angle, they press the corresponding control switch 19 on the controller 18, and the telescopic rod of the linear actuator 13 begins to extend and retract. If the telescopic rod extends, it drives the drive shaft 11 to rotate, and the drive shaft 11 drives the drive arm 9 to rotate clockwise around the fixed shaft 10. The drive arm 9 pushes the connecting arm 7 through the linkage shaft 8, and the connecting arm 7 drives the pivot shaft 6 to rotate, causing the backrest 2 to tilt backward. If the telescopic rod retracts, the drive shaft 11 drives the drive arm 9 to rotate counterclockwise around the fixed shaft 10, and the backrest 2 returns to its forward position. When the user needs to move the chair, they press the switch on the controller 18 to control the wheel lifting mechanism 25. The wheel lifting mechanism 25 works, lowering the self-locking casters 24, and the chair can be moved flexibly by the casters. When the chair needs to be fixed in position, the switch is operated again, and the wheel lifting mechanism 25 raises the self-locking casters 24, so that the base 21 under the chair contacts the ground, thus fixing it in place.

[0063] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. 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. Therefore, they should not be construed as limitations on this utility model.

[0064] However, the above are merely specific embodiments of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A chair with an adjustable backrest angle, comprising a seat (1), a backrest (2), and an adjustment mechanism (3), characterized in that: The seat (1) has a first hinge groove (4) on the lower rear side, and the backrest (2) has a second hinge groove (5) at the bottom. The adjustment mechanism (3) includes: The pivot shaft (6) is rotatably connected at both ends to the second hinge groove (5); A pair of symmetrical connecting arms (7) are fitted on both sides of the pivot shaft (6); The linkage shaft (8) is rotatably connected at both ends to the free ends of the two connecting arms (7); A pair of L-shaped drive arms (9) have their long arm ends rotatably connected to the end of the linkage shaft (8), and at the corners they are rotatably connected to the first hinge slot (4) of the seat (1) via a fixed shaft (10). The drive shaft (11) is rotatably connected at both ends to the short arm ends of the two drive arms (9); Actuator connecting sleeve (12) is fitted onto the middle of drive shaft (11); The linear actuator (13) has its cylinder body hinged to the lower side of the first hinge groove (4) away from the fixed shaft (10), and the end of the telescopic rod is fixed to the actuator connecting sleeve (12). The backrest (2) rotates around the pivot axis (6), and the linear actuator (13) drives the drive arm (9) to rotate around the fixed axis (10) via the drive shaft (11). The drive arm (9) pushes the connecting arm (7) via the linkage shaft (8) to realize the angle adjustment of the backrest (2).

2. A chair with an adjustable backrest angle according to claim 1, characterized in that: The seat (1) is provided with a first hinge seat (14) at the rear and the backrest (2) is provided with a second hinge seat (15) at the bottom. The two are hinged together by a pin (16) to form the second hinge groove (5).

3. A chair with an adjustable backrest angle according to claim 1, characterized in that: The chair seat (1) has armrests (17) on both sides, and at least one armrest (17) is fitted with a controller (18), which has a control switch (19) and is electrically connected to a linear actuator (13).

4. A chair with an adjustable backrest angle according to claim 3, characterized in that: The bottom of the seat (1) is connected to the base (21) via a support leg (20), and the bottom of the base (21) is provided with a caster assembly (22).

5. A chair with an adjustable backrest angle according to claim 4, characterized in that: The caster assembly (22) includes: A receiving cavity (23) is provided at the bottom of the base (21); Self-locking casters (24) are provided in the accommodating cavity (23); The wheel lifting mechanism (25) is fixed at the top of the accommodating cavity (23) and connected to the bottom of the self-locking universal wheel (24) for driving the self-locking universal wheel (24) to lift. The controller (18) is electrically connected to the lifting mechanism.

6. A chair with an adjustable backrest angle according to claim 5, characterized in that: The linear actuator (13) or wheel lifting mechanism (25) is an electric push rod or a pneumatic cylinder.

7. A chair with an adjustable backrest angle according to claim 3, characterized in that: The handrail (17) is T-shaped, and the controller (18) is embedded in the top surface of the horizontal extension of the handrail (17).

Images