Seat adjusting structure with coaxial rotating shaft and femoral head

Abstract

The invention relates to the technical field of seat adjusting structures, in particular to a rotating shaft and femoral head coaxial seat adjusting structure which comprises a cushion and a backrest. The seat further comprises lower hinge plates, upper hinge plates and rotating shaft assemblies, the two lower hinge plates and the two upper hinge plates are located on the left side and the right side of the seat cushion and the backrest, the two lower hinge plates are located above the rear side of the seat cushion, the two upper hinge plates are located in front of the lower side of the backrest, and the lower hinge plates and the upper hinge plates are hinged through the rotating shaft assemblies. The rotating shaft assembly can lock and loosen the lower hinge plate and the upper hinge plate, and a rotating shaft of the rotating shaft assembly is coaxial with the femoral head of a passenger; when the backrest is folded and put down, the backrest and the body coaxially move, the displacement problem does not exist between the backrest and the body, and the comfort of a passenger is improved.

Description

Technical Field

[0001] This invention relates to the technical field of seat adjustment structures, and in particular to a seat adjustment structure in which the rotation axis is coaxial with the femoral head. Background Technology

[0002] A chair is a device for people to sit, rest, and work. To make chairs suitable for different sitting postures and to enable reclining functions, chairs with adjustable backrests have been developed, with the backrest and seat cushion connected by a rotating shaft structure.

[0003] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the traditional adjustable seat's rotating axis structure is located at the rear of the seat cushion and directly below the backrest. In short, the rotation axis of this rotating axis structure is not aligned with the femoral head position of the human body when sitting on the seat cushion. This results in the human's buttocks and legs remaining relatively stable with the seat cushion when the backrest is folded up or reclined to adjust the angle, while the human's torso and head shift with the backrest. This causes the torso's waist, neck, and head to lose their original support, making the folding up and reclining of the backrest uncomfortable for the occupant. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a seat adjustment structure in which the rotating axis is coaxial with the femoral head, so that the backrest moves coaxially with the body when it is folded up and reclined, and there is no misalignment between the backrest and the body, thus improving the comfort of the passenger.

[0005] This invention discloses a seat adjustment structure with a rotating shaft coaxial with the femoral head, comprising a seat cushion and a backrest; it also includes a lower hinge plate, an upper hinge plate, and a rotating shaft assembly. The two lower hinge plates and the upper hinge plate are located on the left and right sides of the seat cushion and the backrest, respectively. The two lower hinge plates are located above the rear side of the seat cushion, and the two upper hinge plates are located at the lower front side of the backrest. The lower and upper hinge plates are hinged together by the rotating shaft assembly, which can lock and release the lower and upper hinge plates. The rotating shaft assembly's rotating shaft is coaxial with the occupant's femoral head. This structure can be applied to all adjustable backrest seats and has a wide market reach. Because the rotating shaft assembly's rotating shaft is moved to a suitable position relative to the traditional seat backrest rotating shaft, making the rotating shaft assembly's rotating shaft coaxial with the femoral head axis, the backrest moves coaxially with the body when folded up or reclined. There is no misalignment between the backrest and the body, allowing the waist, neck, and head of the torso to maintain their original support, thus improving the occupant's comfort when the backrest is folded up or reclined.

[0006] Preferably, the lower hinge plate, the upper hinge plate, and the rotating shaft assembly are used in automobile seats; the automobile seat market has a huge demand, and the application of this adjustment structure in automobile seats can realize great market value.

[0007] Preferably, the dimensions of the lower hinge plate and the upper hinge plate are scaled to adapt to different seat specifications, making them suitable for passengers of different body types. By conducting big data analysis on the sitting postures of passengers of different body types, several seat specifications are divided, so that the limited specifications can adapt to passengers of different body types as much as possible, resulting in good versatility.

[0008] Preferably, the inner sides of the lower hinge plate and the upper hinge plate are provided with soft wrapping material; through the above arrangement, the lower hinge plate and the upper hinge plate support and wrap the sides of the human body, improve the overall support of the seat for the human body, make the seat more integrated and more aesthetically pleasing, and are especially suitable for car seats.

[0009] Preferably, the rotating shaft assembly includes a hinge shaft, a ratchet gear, a mounting plate, a handle, and a limiting tooth. One end of the hinge shaft is fixedly connected to the lower hinge plate, and the other end of the hinge shaft is rotatably connected to the upper hinge plate. The ratchet gear is sleeved on the outer end of the hinge shaft and mounted on the upper hinge plate. The mounting plate is mounted on the outer end of the hinge shaft. The inner end of the handle is elastically connected to the mounting plate. A limiting tooth is installed on the handle and meshes with the ratchet gear. The outer end of the handle faces the seat cushion. When the handle is turned, the limiting tooth disengages from the ratchet gear. At this time, the backrest and the upper hinge plate can rotate around the hinge shaft of the rotating shaft assembly, allowing the backrest to fold up and recline. When the handle is released, the handle drives the limiting tooth to mesh with the ratchet gear. At this time, the upper and lower hinge plates are locked, and the backrest cannot fold up or recline. The structure is simple and the adjustment is convenient.

[0010] Preferably, the rotating shaft assembly is equipped with a geared motor, which is mounted on the lower hinge plate. The output shaft of the geared motor is connected to the upper hinge plate and is coaxial with the femoral head of the occupant. The gearbox of the geared motor is equipped with a worm gear structure. Through the above configuration, the backrest angle can be automatically adjusted. The worm gear structure in the gearbox of the geared motor has a self-locking function, which prevents the backrest from accidentally flipping under pressure, thereby improving comfort and stability.

[0011] Preferably, a protective plate is provided on the inner side of the upper hinge plate to cover the rotating shaft assembly; by providing a protective plate, the inner end of the rotating shaft assembly is separated from the human body, preventing the protruding part of the rotating shaft assembly from hitting the human body and protecting the human body.

[0012] Preferably, matching limiting protrusions and limiting slots are provided on the upper and lower hinge plates; the limiting protrusions and limiting slots on the lower and upper hinge plates limit the rotation angle of the lower and upper hinge plates to prevent the backrest from reclining too far and causing injury to the human body.

[0013] Preferably, an elastic lumbar support is provided between the two upper hinge plates, which elastically supports the occupant's waist. When the backrest is upright, the elastic lumbar support fills the space between the seat cushion and the backrest to provide full support for the waist. When the backrest is reclined, the lower end of the elastic lumbar support deforms to avoid excessive support of the waist and discomfort.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: This structure can be applied to all adjustable backrest seats, and has a wide market; because the rotation axis of the rotating shaft assembly moves to a suitable position relative to the axis of the traditional seat back rotation axis, the rotation axis of the rotating shaft assembly is coaxial with the femoral head axis of the human body, so that when the backrest is folded up and reclined, it moves coaxially with the body, and there is no problem of misalignment between the backrest and the body, so that the waist, neck and head of the torso maintain their original support, and improve the comfort of the passenger when the backrest is folded up and reclined. Attached Figure Description

[0015] Figure 1 This is a structural diagram showing the passenger and the traditional seat back in an upright position. Figure 2 This is a structural diagram of the passenger and the traditional seat backrest reclined to one-third of its position. Figure 3 This is a structural diagram of the passenger and the traditional seat backrest reclined to two-thirds of its position. Figure 4 This is a structural diagram showing the passenger and the traditional seat back fully reclined. Figure 5 This is a side view of the structure of the present invention; Figure 6 This is a schematic diagram of the structure of Embodiment 2 of the present invention; Figure 7 This is a schematic diagram of the structure of Embodiment 3 of the present invention; Figure 8 This is a structural diagram of the occupant and the seat back of the present invention in a vertical position; Figure 9 This is a structural diagram of the passenger and the seat back of the present invention in a state where one-third of the seat is reclined; Figure 10 This is a schematic diagram of the structure of the passenger and the seat back of the present invention in a state where two-thirds of the seat is reclined; Figure 11 This is a schematic diagram of the structure of the passenger and the seat back of the present invention fully reclined.

[0016] The attached diagram is labeled as follows: 1. Seat cushion; 2. Backrest; 3. Lower hinge plate; 4. Upper hinge plate; 5. Rotary shaft assembly. Detailed Implementation

[0017] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. Example

[0018] like Figure 5 , Figures 8 to 11 As shown, a seat adjustment structure with a rotation axis coaxial with the femoral head includes a seat cushion 1 and a backrest 2; it also includes a lower hinge plate 3, an upper hinge plate 4, and a rotation axis assembly 5. The two lower hinge plates 3 and the upper hinge plate 4 are located on the left and right sides of the seat cushion 1 and the backrest 2, respectively. The two lower hinge plates 3 are located above the rear side of the seat cushion 1, and the two upper hinge plates 4 are located in front of the lower side of the backrest 2. The lower hinge plates 3 and the upper hinge plates 4 are hinged together by the rotation axis assembly 5, which can lock and release the lower hinge plates 3 and the upper hinge plates 4. The rotation axis of the rotation axis assembly 5 is coaxial with the femoral head of the passenger. The dimensions of the lower hinge plates 3 and the upper hinge plates 4 are scaled according to different seat specifications to suit passengers of different body types. An elastic lumbar support is provided between the two upper hinge plates 4, providing elastic support for the passenger's lower back. This structure can be applied to all adjustable backrest seats, especially in the automotive seat market where it is widely used. Its application in automotive seats can realize significant market value. By conducting big data analysis on the sitting postures of passengers of different body types, several seat specifications are defined, allowing for greater adaptability to different body types within a limited range of specifications. When the backrest 2 is upright, the elastic lumbar support fills the space between the seat cushion 1 and the backrest 2, providing comprehensive lumbar support. Because the rotation axis of the rotating shaft assembly 5 is moved to a suitable position relative to the traditional backrest rotation axis, making the rotation axis of the rotating shaft assembly 5 coaxial with the femoral head axis of the human body, the backrest 2 moves coaxially with the body when folded up, eliminating any misalignment between the backrest 2 and the body. This maintains the original support for the torso, waist, neck, and head, improving passenger comfort when the backrest 2 is folded up and reclined. When the backrest 2 is reclined, the lower end of the elastic lumbar support deforms, preventing excessive pressure on the lower back and avoiding discomfort.

[0019] Specifically, in comparison Figure 1 and Figure 8 , Figure 2 and Figure 9 , Figure 3 and Figure 10 as well as Figure 4 and Figure 11 By observing the relative positions of the headrest on the upper side of the seat back and the occupant's head, and the relative positions of the lumbar support and the lower back at different reclining angles, it can be seen that: 1. In traditional headrests, the position clearly shifts from the head and neck area to the top of the head during the backrest reclining and rotation process. In the seat structure of this invention, the headrest remains in the head and neck area of ​​the occupant throughout the backrest reclining process. 2. It perfectly solves the problem of extreme discomfort for passengers when folding down all current seat backs. It has the following advantages: the lumbar support is less noticeable; in traditional seats, the lumbar support has shifted to the chest, while the lumbar support of this invention remains essentially at the waist of the passenger.

[0020] In summary, this invention perfectly solves the problem that current seat backs are extremely uncomfortable for passengers when folded down. Example

[0021] like Figure 6 As shown, based on Embodiment 1, the inner sides of the lower hinge plate 3 and the upper hinge plate 4 are provided with soft wrapping material; the rotating shaft assembly 5 includes a hinge shaft, a ratchet, a mounting plate, a handle, and a limiting tooth. One end of the hinge shaft is fixedly connected to the lower hinge plate 3, and the other end of the hinge shaft is rotatably connected to the upper hinge plate 4. The ratchet is sleeved on the outer end of the hinge shaft and mounted on the upper hinge plate 4. The mounting plate is mounted on the outer end of the hinge shaft. The inner end of the handle is elastically connected to the mounting plate. A limiting tooth is installed on the handle, and the limiting tooth meshes with the ratchet. The outer end of the handle faces the seat cushion 1. Matching limiting protrusions and limiting slots are provided on the upper hinge plate 4 and the lower hinge plate 3.

[0022] The above-mentioned design allows the lower hinge plate 3 and upper hinge plate 4 to support and wrap around the sides of the human body, improving the overall support of the seat and making the seat more aesthetically pleasing and structurally sound. This is especially suitable for car seats. Moving the handle disengages the limiting tooth from the ratchet, allowing the backrest 2 and upper hinge plate 4 to rotate around the hinge axis of the rotating shaft assembly 5, enabling the backrest 2 to fold up and recline. Releasing the handle engages the limiting tooth with the ratchet, locking the upper hinge plate 4 and lower hinge plate 3, preventing the backrest 2 from folding up or reclining. The structure is simple and easy to adjust. The limiting protrusions and limiting slots of the lower hinge plate 3 and upper hinge plate 4 limit the rotation angle of the lower hinge plate 3 and upper hinge plate 4, preventing the backrest 2 from reclining too far and causing injury to the human body. Example

[0023] like Figure 7 As shown, based on Embodiment 1, the rotating shaft assembly 5 is equipped with a geared motor, which is mounted on the lower hinge plate 3. The output shaft of the geared motor is connected to the upper hinge plate 4. The output shaft of the geared motor is coaxial with the femoral head of the passenger. A worm gear structure is provided in the gearbox of the geared motor. A protective plate is provided on the inner side of the upper hinge plate 4, which covers the rotating shaft assembly 5.

[0024] The above settings enable automatic adjustment of the backrest 2 angle. The worm gear structure in the gearbox of the geared motor has a self-locking function, which prevents the backrest 2 from accidentally flipping under pressure, thus improving comfort and stability. By setting a guard plate to separate the inner end of the rotating shaft assembly 5 from the human body, the protruding part of the rotating shaft assembly 5 is prevented from hitting the human body, thus protecting the human body.

[0025] like Figures 5 to 11 As shown, the present invention discloses a seat adjustment structure with a rotating shaft coaxial with the femoral head. In operation, the backrest 2 is first erected vertically, and the rotating shaft assembly 5 locks the lower hinge plate 3 and the upper hinge plate 4. The occupant sits on the seat cushion 1, with their torso and head resting against the backrest 2, which provides support. When the angle of the backrest 2 needs adjustment, the rotating shaft assembly 5 is operated to unlock the lower hinge plate 3 and the upper hinge plate 4. The occupant then reclines, pressing the backrest 2 to a suitable angle. The rotating shaft assembly 5 is then operated to lock the lower hinge plate 3 and the upper hinge plate 4. Finally, the rotation axis of the backrest 2 is coaxial with the axis of the femoral head, preventing displacement of the torso and head relative to the backrest 2, thus ensuring the backrest 2 maintains support for the torso and head.

[0026] The main functions achieved by this invention are: 1. Move the axis of rotation of the seat back from the back of the seat cushion to the top of the seat cushion, and move the axis of rotation of the seat back from the bottom of the seat back to the front of the seat back. The position of the seat back rotation axis should be coaxial with the axis of the occupant's femoral head. 2. When the backrest is folded up or reclined, it moves coaxially with the body, and there is no misalignment between the backrest and the body, thus improving the comfort of the passenger; 3. It provides support and wrapping to the sides of the body, improving the overall support of the seat for the body; 4. It has good versatility and a large market size; 5. Suitable for car seats.

[0027] The seat adjustment structure of the present invention, in which the rotating shaft is coaxial with the femoral head, can be installed, connected, or set in a manner that is common in mechanical systems. Any method that can achieve the desired beneficial effect can be implemented. The seat cushion 1, backrest 2, lower hinge plate 3, upper hinge plate 4, rotating shaft assembly 5, elastic lumbar support, guard plate, reduction motor, hinge shaft, ratchet gear, limiting gear, and wrapping material of the seat adjustment structure of the present invention are all commercially available. Those skilled in the art only need to install and operate the structure according to the accompanying instruction manual, without requiring any creative effort from those skilled in the art.

[0028] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A seat adjustment structure with a rotation axis coaxial with the femoral head, comprising a seat cushion (1) and a backrest (2); characterized in that, It also includes a lower hinge plate (3), an upper hinge plate (4) and a rotating shaft assembly (5). The two lower hinge plates (3) and the upper hinge plate (4) are located on the left and right sides of the seat cushion (1) and the backrest (2). The two lower hinge plates (3) are located above the rear side of the seat cushion (1), and the two upper hinge plates (4) are located in front of the lower side of the backrest (2). The lower hinge plates (3) and the upper hinge plates (4) are hinged by the rotating shaft assembly (5). The rotating shaft assembly (5) can lock and release the lower hinge plates (3) and the upper hinge plates (4). The rotating shaft of the rotating shaft assembly (5) is coaxial with the femoral head of the passenger.

2. The seat adjustment structure with a rotating shaft coaxial with the femoral head as described in claim 1, characterized in that, The lower hinge plate (3), the upper hinge plate (4), and the rotating shaft assembly (5) are used in car seats.

3. The seat adjustment structure with the rotating shaft coaxial with the femoral head as described in claim 1, characterized in that, The dimensions of the lower hinge plate (3) and the upper hinge plate (4) are adapted to different seat specifications and are suitable for passengers of different body types.

4. The seat adjustment structure with the rotating shaft coaxial with the femoral head as described in claim 1, characterized in that, The inner sides of the lower hinge plate (3) and the upper hinge plate (4) are provided with soft wrapping material.

5. The seat adjustment structure with the rotating shaft coaxial with the femoral head as described in claim 1, characterized in that, The rotating shaft assembly (5) includes a hinge shaft, a ratchet, a mounting plate, a handle, and a limiting tooth. One end of the hinge shaft is fixedly connected to the lower hinge plate (3), and the other end of the hinge shaft is rotatably connected to the upper hinge plate (4). The ratchet is sleeved on the outer end of the hinge shaft and mounted on the upper hinge plate (4). The mounting plate is mounted on the outer end of the hinge shaft. The inner end of the handle is elastically connected to the mounting plate. A limiting tooth is installed on the handle and meshes with the ratchet. The outer end of the handle faces the seat cushion (1).

6. The seat adjustment structure with the rotating shaft coaxial with the femoral head as described in claim 1, characterized in that, The rotating shaft assembly (5) is equipped with a geared motor, which is mounted on the lower hinge plate (3). The output shaft of the geared motor is connected to the upper hinge plate (4). The output shaft of the geared motor is coaxial with the femoral head of the passenger. The gearbox of the geared motor is equipped with a worm gear structure.

7. The seat adjustment structure with the rotating shaft coaxial with the femoral head as described in claim 1, characterized in that, A guard plate is provided on the inner side of the upper hinge plate (4), and the guard plate covers the rotating shaft assembly (5).

8. The seat adjustment structure with the rotating shaft coaxial with the femoral head as described in claim 1, characterized in that, Matching limiting protrusions and limiting slots are provided on the upper hinge plate (4) and the lower hinge plate (3).

9. A seat adjustment structure with a rotating shaft coaxial with the femoral head as described in claim 1, characterized in that, An elastic lumbar support is provided between the two upper hinge plates (4), which provides elastic support for the occupant's waist.

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