Backrest device and seat

Abstract

The utility model belongs to the technical field of seats, and discloses a backrest device and a seat, the backrest device comprises a framework, an adjusting assembly and a pull rope, the adjusting assembly comprises an upper plate, a lower plate, an elastic plate, a bearing shaft and a motor, the upper plate and the lower plate are both installed on the framework in a sliding mode, the upper plate is provided with a first rack, and the lower plate is provided with a second rack; two ends of the elastic plate are respectively connected to the upper plate and the lower plate; the periphery of the bearing shaft is sleeved with a transmission part, the transmission part is provided with outer meshing teeth, the transmission part is located between the first rack and the second rack and is in meshing transmission connection with the first rack and the second rack, one end of the pull rope is connected to the top of the framework, and the other end of the pull rope is connected to the transmission part; the output end of the motor is connected to the transmission component. The structural layout of the backrest device is optimized, the number of driving parts is reduced, and cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of seats, in particular to a backrest device and a seat. Background Art

[0002] The human spine includes the cervical spine, thoracic spine, lumbar spine and sacrum (pelvic spine). The lumbar spine is the most vulnerable and needs the most protection because it has strong mobility, supports most of the body weight, and bears various vibrations caused by human activities. Once the lumbar spine is out of the "S" shape for various reasons, the intervertebral pressure in the lumbar area will increase rapidly, making it more prone to fatigue and pain. For this reason, the seat structure needs to be improved.

[0003] Nowadays, most car seats are equipped with adjustable electric backrests to adjust according to the needs of the driver and passengers, which is more user-friendly than fixed backrests. At present, the two-way adjustment structure is composed of skeleton steel wire, plastic support plate and support steel plate, drive unit, screw rod and slider. The four-way adjustment is achieved by using two sets of screw drive mechanisms to achieve the forward and backward movements of the upper and lower positions respectively. This type of product has many parts, the drive unit structure is very complex, the assembly process is cumbersome, and the overall product price is expensive. Utility Model Content

[0004] The purpose of the utility model is to provide a backrest device and a seat, optimize the structural layout, reduce driving parts and reduce costs.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] In a first aspect, a backrest device is provided, comprising a frame, an adjustment assembly and a pull rope, wherein the adjustment assembly is slidably mounted on the frame, and the adjustment assembly comprises:

[0007] The upper plate and the lower plate are both slidably mounted on the frame, the upper plate is provided with a first rack, the lower plate is provided with a second rack, and the first rack and the second rack are arranged opposite to each other;

[0008] An elastic plate, two ends of which are respectively connected to the upper plate and the lower plate;

[0009] A bearing shaft, the periphery of which is sleeved with a transmission component, the transmission component is provided with external meshing teeth, the transmission component is located between the first rack and the second rack, and the transmission component is respectively meshed and connected with the first rack and the second rack, one end of the pull rope is connected to the top of the frame, and the other end of the pull rope is connected to the transmission component;

[0010] The motor has an output end connected to the transmission component.

[0011] As an optional technical solution, the transmission component includes:

[0012] A transmission wheel connected to the output end of the motor, and the pull rope is connected to the transmission wheel;

[0013] A meshing gear is disposed between the first rack and the second rack, and the meshing gear is meshed and transmission-connected with the first rack and the second rack respectively;

[0014] A torsion spring, two ends of which are respectively connected to the transmission wheel and the meshing gear.

[0015] As an optional technical solution, the torsion spring is located between the transmission wheel and the meshing gear, the transmission wheel is provided with a first limiting groove, the meshing gear is provided with a second limiting groove, one end of the torsion spring is embedded in the first limiting groove, and the other end of the torsion spring is embedded in the second limiting groove.

[0016] As an optional technical solution, the motor and the transmission component are located on the same side of the frame, and the elastic plate is located on a side of the frame away from the motor.

[0017] As an optional technical solution, the backrest device further includes a support plate, the elastic plate is located between the support plate and the frame, and the support plate is used to support the back of the user.

[0018] As an optional technical solution, the top of the support plate is connected to the top of the frame in a rotational manner around a horizontal line.

[0019] As an optional technical solution, the elastic plate is a steel bar.

[0020] As an optional technical solution, the backrest device further includes a protective shell, which is fixedly mounted on the upper plate or the lower plate, and the load-bearing shaft and the motor are mounted inside the protective shell.

[0021] As an optional technical solution, the backrest device also includes a limiting column, one of the protective shell and the limiting column is installed on the upper plate, and the other of the two is installed on the lower plate, and when the limiting column abuts against the protective shell, the upper plate and the lower plate stop approaching each other.

[0022] According to a second aspect, a seat is provided, comprising the backrest device as described above.

[0023] Beneficial effects of the utility model:

[0024] The utility model provides a backrest device and a seat. The backrest device comprises a frame, an adjustment component and a pull rope. The adjustment component is slidably installed on the frame. The adjustment component comprises an upper plate, a lower plate, an elastic plate, a bearing shaft, a transmission component and a motor. The upper plate and the lower plate are both slidably installed on the frame. The upper plate is provided with a first rack, and the lower plate is provided with a second rack. The first rack and the second rack are arranged oppositely. The two ends of the elastic plate are respectively connected to the upper plate and the lower plate. The transmission component is sleeved on the periphery of the bearing shaft, the transmission component is provided with external meshing teeth, the transmission component is located between the first rack and the second rack, and the transmission component is respectively meshed and transmission-connected with the first rack and the second rack. One end of the pull rope is connected to the top of the frame, and the other end of the pull rope is connected to the transmission component. The output end of the motor is connected to the transmission component. When the seat needs to provide stronger support for the user's back, the motor is started, and the motor drives the transmission component to rotate forward. One end of the pull rope is wound around the periphery of the transmission component, so that the adjustment component as a whole slides upward along the frame. At the same time, due to the meshing action of the transmission component with the first rack and the second rack, the upper plate and the lower plate are brought closer to each other, thereby causing the elastic plate to elastically deform and arch, and the arched elastic plate supports the user's back; when the motor drives the transmission component to rotate in the opposite direction, the transmission component unwinds the pull rope, so that the adjustment component as a whole slides downward along the frame. At the same time, the upper plate and the lower plate move away from each other, and the elastic plate tends to straighten. The structure of the backrest device is optimized, the number of driving parts is reduced, and the cost can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a partial structural schematic diagram of the backrest device (without a protective shell) of the utility model from a first perspective;

[0026] Figure 2 It is a partial structural schematic diagram of the backrest device of the utility model from a first viewing angle;

[0027] Figure 3 It is a partial structural schematic diagram of the backrest device of the utility model (without the elastic plate and the supporting plate) from a second viewing angle;

[0028] Figure 4 It is a partial structural schematic diagram of the backrest device (without a support plate) of the utility model from a second viewing angle;

[0029] Figure 5 It is a partial structural schematic diagram of the backrest device of the utility model from a second viewing angle.

[0030] In the figure:

[0031] 1. Skeleton;

[0032] 2. Adjustment assembly; 21. Upper plate; 22. Lower plate; 23. First rack; 24. Second rack; 25. Elastic plate; 251. Upper limit portion; 252. Lower limit portion; 26. Load-bearing shaft; 27. Transmission wheel; 271. First limit slot; 28. Torsion spring; 29. ​​Meshing gear; 291. Second limit slot; 210. Motor; 211. Protective shell; 212. Limit column;

[0033] 3. Pull rope;

[0034] 4. Pallet. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0036] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0038] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0039] like Figures 1 to 5 As shown, the backrest device provided in this embodiment includes a frame 1, an adjustment component 2 and a pull rope 3, the adjustment component 2 is slidably installed on the frame 1, the adjustment component 2 includes an upper plate 21, a lower plate 22, an elastic plate 25, a bearing shaft 26, a transmission component and a motor 210, the upper plate 21 and the lower plate 22 are both slidably installed on the frame 1, the upper plate 21 is provided with a first rack 23, the lower plate 22 is provided with a second rack 24, the first rack 23 and the second rack 24 are arranged opposite to each other; the two ends of the elastic plate 25 are respectively connected to the upper plate 21 and the lower plate 22; the transmission component is sleeved on the periphery of the bearing shaft 26, the transmission component is provided with external meshing teeth, the transmission component is located between the first rack 23 and the second rack 24, and the transmission component is respectively meshed and connected with the first rack 23 and the second rack 24, one end of the pull rope 3 is connected to the top of the frame 1, and the other end of the pull rope 3 is connected to the transmission component; the output end of the motor 210 is connected to the transmission component.

[0040] Specifically, when the seat needs to provide stronger support for the user's back, the motor 210 is started, and the motor 210 drives the transmission component to rotate forward, and one end of the pull rope 3 is wound around the periphery of the transmission component, so that the adjustment component 2 slides upward along the frame 1 as a whole. At the same time, due to the meshing action of the transmission component with the first rack 23 and the second rack 24, the upper plate 21 and the lower plate 22 are brought close to each other, thereby causing the elastic plate 25 to elastically deform and arch, and the arched elastic plate 25 supports the user's back; when the motor 210 drives the transmission component to rotate in the opposite direction, the transmission component unwinds the pull rope 3, so that the adjustment component 2 slides downward along the frame 1 as a whole. At the same time, the upper plate 21 and the lower plate 22 move away from each other, and the elastic plate 25 tends to straighten. The structure of the backrest device is optimized, the number of driving parts is reduced, and the cost can be reduced.

[0041] The backrest device of this embodiment only needs to be equipped with one motor 210 to move the upper plate 21 and the lower plate 22 closer to each other, causing the elastic plate 25 to elastically deform and arch, and at the same time drive the adjustment component 2 to slide upward along the frame 1 as a whole, thereby reducing costs and making the weight of the adjustment component 1 relatively light.

[0042] In this embodiment, two elastic plates 25 are provided.

[0043] Optionally, the upper plate 21 and the first rack 23 are integrally arranged, and the lower plate 22 and the second rack 24 are integrally arranged. The upper plate 21 and the lower plate 22 have the same structure. During specific use, the upper plate 21 and the lower plate 22 are arranged 180° offset with the central axis of the load-bearing shaft 26 as the rotation center line. The upper plate 21 and the lower plate 22 are made of the same set of production equipment, and the production cost is lower.

[0044] Optionally, the transmission component includes a transmission wheel 27, a meshing gear 29 and a torsion spring 28, the transmission wheel 27 is connected to the output end of the motor 210, and the pull rope 3 is connected to the transmission wheel 27; the meshing gear 29 is arranged between the first rack 23 and the second rack 24, and the meshing gear 29 is respectively meshed and transmission connected with the first rack 23 and the second rack 24; the two ends of the torsion spring 28 are respectively connected to the transmission wheel 27 and the meshing gear 29.

[0045] When the motor 210 drives the transmission wheel 27 to rotate forward, the pull rope 3 is wound around the periphery of the transmission wheel 27, driving the adjustment assembly 2 as a whole to rise. At the same time, the torsion spring 28 transmits the torque of the transmission wheel 27 to the meshing gear 29, and the meshing gear 29 is meshed and connected with the first rack 23 and the second rack 24, thereby driving the upper plate 21 and the lower plate 22 to approach each other. When the distance between the upper plate 21 and the lower plate 22 is no longer reduced, for example, the upper plate 21 and the lower plate 22 are abutted, the transmission wheel 27 can continue to rotate forward because the torsion spring 28 can be elastically deformed, so that the adjustment assembly 2 continues to rise. In this embodiment, the transmission wheel 27, the meshing gear 29 and the torsion spring 28 are all sleeved on the periphery of the bearing shaft 26.

[0046] In this embodiment, a worm is provided at the output end of the motor 210, and the transmission wheel 27 is a worm wheel. The worm and the worm wheel are meshingly connected. In some other embodiments, a reducer is provided at the output end of the motor 210, and the reducer is connected to the transmission wheel 27.

[0047] Optionally, the torsion spring 28 is located between the transmission wheel 27 and the meshing gear 29, the transmission wheel 27 is provided with a first limiting groove 271, the meshing gear 29 is provided with a second limiting groove 291, one end of the torsion spring 28 is embedded in the first limiting groove 271, and the other end of the torsion spring 28 is embedded in the second limiting groove 291. The torsion spring 28 is arranged between the transmission wheel 27 and the meshing gear 29, and limiting grooves are respectively provided on the transmission wheel 27 and the meshing gear 29, and the limiting grooves are used to limit the ends of the torsion spring 28 to prevent the torsion spring 28 from being separated from the transmission wheel 27 or the meshing gear 29.

[0048] Optionally, the motor 210 and the transmission component are located on the same side of the frame 1, and the elastic plate 25 is located on the side of the frame 1 away from the motor 210. The transmission component or the motor 210 is prevented from hindering the deformation of the elastic plate 25.

[0049] Optionally, an upper limit portion 251 is provided on the side of the elastic plate 25 facing the upper plate 21, and a lower limit portion 252 is provided on the side of the elastic plate 25 facing the lower plate 22. The upper limit portion 251 and the lower limit portion 252 provide a limiting function. When the upper plate 21 and the lower plate 22 approach each other, the elastic plate 25 arches in a direction away from the motor 210 and the transmission components.

[0050] Optionally, the backrest device further includes a support plate 4, and an elastic plate 25 is located between the support plate 4 and the frame 1, and the support plate 4 is used to support the back of the user. When the elastic plate 25 elastically deforms and arches, the elastic plate 25 pushes the support plate 4 to arch, and the support plate 4 supports the back of the user to prevent the elastic plate 25 from directly contacting the user and scratching the user.

[0051] Optionally, the top of the support plate 4 is connected to the top of the frame 1 by rotation around a horizontal line.

[0052] In this embodiment, the elastic plate 25 is a steel bar. Applying a certain pressure to both ends of the steel bar can cause the steel bar to arch, and applying a certain pulling force to both ends of the steel bar can cause the steel bar to tend to straighten.

[0053] Optionally, the backrest device further includes a protective shell 211, which is fixedly mounted on the upper plate 21 or the lower plate 22, and the bearing shaft 26 and the motor 210 are mounted inside the protective shell 211. The protective shell 211 isolates and protects the bearing shaft 26 and the motor 210, and provides support for the bearing shaft 26 and the motor 210.

[0054] Optionally, the backrest device further includes a limiting column 212, one of the protective shell 211 and the limiting column 212 is installed on the upper plate 21, and the other of the two is installed on the lower plate 22, and when the limiting column 212 abuts against the protective shell 211, the upper plate 21 and the lower plate 22 stop approaching each other.

[0055] In this embodiment, the protective shell 211 is mounted on the lower plate 22, and the limiting column 212 is mounted on the upper plate 21. When the protective shell 211 abuts against the limiting column 212, the distance between the upper plate 21 and the lower plate 22 is the smallest, and the upper plate 21 and the lower plate 22 stop approaching each other. In some other embodiments, the protective shell 211 is mounted on the upper plate 21, and the limiting column 212 is mounted on the lower plate 22.

[0056] This embodiment also provides a seat, which includes the backrest device as described above.

[0057] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A backrest device, characterized in that: The invention comprises a frame (1), an adjustment component (2) and a pull rope (3), wherein the adjustment component (2) is slidably mounted on the frame (1), and the adjustment component (2) comprises: An upper plate (21) and a lower plate (22) are both slidably mounted on the frame (1); the upper plate (21) is provided with a first rack (23), and the lower plate (22) is provided with a second rack (24); the first rack (23) and the second rack (24) are arranged opposite to each other; An elastic plate (25), two ends of which are respectively connected to the upper plate (21) and the lower plate (22); A bearing shaft (26) is provided with a transmission component on its periphery, the transmission component is provided with external meshing teeth, the transmission component is located between the first rack (23) and the second rack (24), and the transmission component is respectively meshed and connected with the first rack (23) and the second rack (24), one end of the pull rope (3) is connected to the top of the frame (1), and the other end of the pull rope (3) is connected to the transmission component; The motor (210) has an output end connected to the transmission component.

2. The backrest device according to claim 1, characterized in that: The transmission components include: A transmission wheel (27) connected to the output end of the motor (210), and the pull rope (3) is connected to the transmission wheel (27); A meshing gear (29) is disposed between the first rack (23) and the second rack (24), and the meshing gear (29) is respectively meshed and transmission-connected with the first rack (23) and the second rack (24); The torsion spring (28) has two ends connected to the transmission wheel (27) and the meshing gear (29) respectively.

3. The backrest device according to claim 2, characterized in that: The torsion spring (28) is located between the transmission wheel (27) and the meshing gear (29); the transmission wheel (27) is provided with a first limiting groove (271); the meshing gear (29) is provided with a second limiting groove (291); one end of the torsion spring (28) is embedded in the first limiting groove (271); and the other end of the torsion spring (28) is embedded in the second limiting groove (291).

4. The backrest device according to claim 1, characterized in that: The motor (210) and the transmission component are located on the same side of the frame (1), and the elastic plate (25) is located on a side of the frame (1) facing away from the motor (210).

5. The backrest device according to claim 1, characterized in that: The backrest device also includes a support plate (4), the elastic plate (25) is located between the support plate (4) and the frame (1), and the support plate (4) is used to support the back of a user.

6. The backrest device according to claim 5, characterized in that: The top of the support plate (4) is connected to the top of the frame (1) in a rotational manner around a horizontal line.

7. The backrest device according to claim 1, characterized in that: The elastic plate (25) is a steel bar.

8. The backrest device according to claim 1, characterized in that: The backrest device further comprises a protective shell (211), wherein the protective shell (211) is fixedly mounted on the upper plate (21) or the lower plate (22), and the bearing shaft (26) and the motor (210) are mounted inside the protective shell (211).

9. The backrest device according to claim 8, characterized in that: The backrest device further comprises a limiting column (212); one of the protective shell (211) and the limiting column (212) is mounted on the upper plate (21), and the other of the limiting column (212) is mounted on the lower plate (22); when the limiting column (212) abuts against the protective shell (211), the upper plate (21) and the lower plate (22) stop approaching each other.

10. A seat, characterized in that: The seat comprises a backrest device as claimed in any one of claims 1-9.

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