An automobile seat

Abstract

This invention belongs to the field of automotive seat technology. It solves the problem of poor comfort in existing automotive seats. It provides an automotive seat with a seat cushion support member and two inverted V-shaped linkage rods positioned between two seat side panels, resting against a seat cushion frame. The front ends of the seat cushion support member are hinged to the front ends of the two seat side panels via first connecting rods. The middle portions of the linkage rods are hinged to the rear ends of the two seat side panels via second connecting rods. The front ends of the two linkage rods are hinged to the rear ends of the seat cushion support member. Each linkage rod has a slotted hole at its rear end. The lower ends of the two backrest connecting plates each have a horizontally arranged linkage pin. The two linkage pins are inserted into the slotted holes of the two linkage rods. When the backrest frame rotates, the linkage pins abut against the front edges of the slotted holes, and the linkage pins drive the rotation of the linkage rods, thereby lifting the seat cushion support member. This design improves the comfort of the automotive seat.

Description

Technical Field

[0001] This invention belongs to the field of automotive seat technology and relates to an automotive seat. Background Technology

[0002] Car seats are not only an important part of the car's interior, but also the most direct and intimate contact point for drivers and passengers. Therefore, the comfort of car seats plays a crucial role in the user's driving and riding experience. Currently, car seats are no longer simply "seating furniture," and are no longer limited to providing a good driving and riding posture. Designers are constantly giving car seats more functions. To facilitate rest for passengers or provide more diverse seating positions, most current car seats have a reclining function, meaning the seat back can recline relative to the seat cushion to a horizontal or near-horizontal position.

[0003] For example, Chinese patent literature discloses a car seat with an integrated angle adjuster coil spring (application number: 201921381309.4), which includes a backrest body, a seat cushion body, a synchronizing rod, and two angle adjusters symmetrically arranged on both sides of the backrest body and the seat cushion body, and two connecting plates symmetrically arranged on both sides of the backrest body and the seat cushion body; the lower end of the connecting plate is fixedly connected to the seat cushion body, and the upper end of the connecting plate is connected to the backrest body through the angle adjuster; the two angle adjusters are connected together through the synchronizing rod.

[0004] The car seat with the aforementioned adjustable spring has the same shortcomings as existing car seats during use: because the rear end of the seat cushion is slightly tilted downwards, and the rotation center line of the backrest adjuster is higher than the support plane of the seat cushion, there is a height difference between the support plane of the seat cushion and the support plane of the backrest when the backrest is reclined to a horizontal or near-horizontal position relative to the seat cushion. This height difference causes the user's lower back to be in a significantly unsupported state when lying flat, resulting in a poor comfort experience when lying flat. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by providing a car seat. The technical problem this invention aims to solve is how to improve the comfort of car seats.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A car seat includes a seat cushion frame and a backrest frame rotatably connected to the seat cushion frame. The seat cushion frame includes two seat side panels arranged opposite each other and a seat basin connected between the two seat side panels. The seat cushion frame is characterized by having a seat cushion support member and two linkage rods disposed between the two seat side panels. The front ends of the seat cushion support member are respectively hinged to the front ends of the two seat side panels via first linkages. The linkage rods are inverted V-shaped, and the middle portions of each linkage rod are respectively hinged to the rear ends of the two seat side panels via second linkages. The front ends of the two linkage rods are respectively hinged to the seat cushion support member. On both sides of the rear end of the cushion support, the rear ends of the two linkage rods each have a strip-shaped hole opened in the front-back direction. The lower ends of the backrest frame are respectively fixed to the vertically arranged backrest connecting plates. The lower ends of the two backrest connecting plates each have a horizontally arranged linkage pin. The two linkage pins are respectively inserted into the strip-shaped holes of the two linkage rods. The cushion support abuts against the cushion frame, and when the backrest frame rotates, it can drive the linkage pin to abut against the front edge of the strip-shaped hole, and drive the linkage rod to rotate through the linkage pin to drive the cushion support to rise.

[0008] This car seat cleverly incorporates a backrest connecting plate with linkage pins and a linkage rod with slotted holes. This design ensures that during seated angle adjustment (i.e., the first stage of backrest frame angle adjustment), the linkage pins of the two backrest connecting plates move only within the slotted holes of the linkage rod and do not contact the two end edges of the slotted holes. This prevents the linkage pins from driving the linkage rod to rotate when the two backrest connecting plates move synchronously with the backrest frame, allowing for independent adjustment of the backrest angle within the seated angle range. Meanwhile, the seat cushion support rests against the seat cushion frame, preventing its descent or elevation from affecting the user's riding experience and ensuring user comfort. When the car seat is in a reclining position and the angle is adjusted (i.e., the second stage of backrest frame angle adjustment), the linkage pins of the two backrest connecting plates contact the front edge of the same-side strip hole and drive the linkage rod to rotate, thereby lifting the seat cushion support. This allows the seat cushion support to gradually rise to provide lumbar support during the transition from a sitting to a reclining position, or to gradually descend and retract under the influence of body weight during the transition from a reclining to a sitting position, avoiding a sudden loss of support and preventing a feeling of emptiness. This ensures that the user's lumbar region is supported when lying down, thus improving the comfort of the car seat.

[0009] In the aforementioned car seat, the upper end of the second link is hinged to the bend of the linkage rod, and the second link is inclined from top to bottom and from back to front. The upper end of the backrest connecting plate has a mounting hole, and the strip hole is arc-shaped with the center of the mounting hole of the backrest connecting plate as the center. The linkage pin can abut against the end edge of the strip hole. This allows the linkage pin to better drive the linkage rod to rotate when it rotates with the backrest frame and moves within the strip hole to the front edge of the strip hole. In addition, since the upper end of the second link is hinged to the bend of the linkage rod and the second link is inclined from top to bottom and from back to front, when the linkage pin drives the linkage rod to rotate, the front end of the linkage rod can swing upward around its hinge point with the second link, thereby better lifting the seat cushion support.

[0010] In the aforementioned car seat, the two ends of the strip-shaped hole are both arc-shaped, the linkage pin is cylindrical, and adjusters are respectively provided on the left and right sides of the lower end of the backrest frame. A linkage rod is provided between the two adjusters, and the center line connecting the two backrest connecting plate mounting holes coincides with the center line of the linkage rod. This ensures that the rotation centers of the backrest connecting plate and the backrest frame remain coaxial, allowing the linkage pin on the backrest connecting plate to rotate synchronously with the backrest frame, thereby better driving the linkage rod to rotate.

[0011] In the aforementioned type of car seat, the front end of the seat cushion support is located below the seat pan, and a rear cross tube connects the rear ends of the two seat side panels. A backing plate parallel to the rear cross tube is fixedly connected to the rear side of the seat cushion support, and when the backrest frame rotates forward, the backing plate abuts against the rear cross tube vertically. This allows the rear cross tube to support the seat cushion support in a seated position, preventing it from sinking or collapsing under the weight of the person.

[0012] In the aforementioned type of car seat, the seat cushion support includes a U-shaped support frame and several elastic rods arranged side by side. The two ends of each elastic rod are fixedly connected to the front and rear ends of the support frame, respectively. The elastic rods are connected to each other by several horizontally arranged support plates. The leftmost and rightmost elastic rods are fixedly connected to the left and right sides of the support frame, respectively. This seat cushion support structure allows for elastic deformation and flexibly adjusts the support force according to the body weight and sitting posture, evenly distributing pressure points, preventing localized collapse, and providing high comfort for the body.

[0013] In the aforementioned type of car seat, all the elastic rods are bent back and forth in the front-to-back direction. The rear ends of all the elastic rods extend backward from the abutment plate and are fixed to the abutment plate. The portion of the elastic rod extending from the abutment plate has a downward-curving arc shape, and when the backrest frame rotates forward, the portion of the elastic rod extending from the abutment plate and the abutment plate can simultaneously abut against the rear cross tube. This allows the rear cross tube to better support and position the seat cushion support in the sitting position, preventing the seat cushion support from descending or shifting forward under the weight of the person.

[0014] In the aforementioned type of car seat, the support frame includes a front crossbar and a rear crossbar spaced apart. The ends of the front and rear crossbars on the same side are connected by a vertically arranged support plate. The support plate is elongated and has a downward-curving arc segment at its front end, which is hinged to the first connecting rod. The front ends of the two linkage rods are respectively hinged to both ends of the rear crossbar. This design results in high structural strength for the seat cushion support and allows for better lifting or lowering of the seat cushion support.

[0015] In the aforementioned type of car seat, a slide rail assembly is located below the seat cushion frame. A drive rod and two lead screw motors are also mounted on the seat cushion frame. Rear connecting rods are fixed to both ends of the rear cross tube. The lower ends of the two rear connecting rods are hinged to the slide rail assembly. One end of each drive rod is hinged to a rear connecting rod on the same side, and the other end of each drive rod is sleeved on the lead screw of the lead screw motor on the same side and threadedly connected to the lead screw. This enables electric lifting and lowering of the seat cushion frame, thereby improving the comfort of the car seat.

[0016] In the aforementioned type of car seat, the seat basin is further provided with a first leg rest, a second leg rest slidably connected to the first leg rest, a push rod arranged along the front-rear direction of the car seat and capable of moving back and forth relative to the car seat, and a connecting shaft arranged along the left-right direction of the car seat and hinged to the push rod. Connecting plates are fixedly connected to both ends of the connecting shaft. A third link and a sixth link are hinged to the connecting plates respectively. The third link and the connecting plate are arranged crosswise and hinged to a fourth link. The ends of the fourth link and the connecting plate facing the seat basin are respectively hinged to the seat basin. The connecting plate, the third link, the fourth link, and the seat basin form a four-link structure. The ends of the third link and the sixth link facing the first leg rest are respectively hinged to the first leg rest. The connecting plate, the third link, the sixth link, and the first leg rest also form a four-link structure. The end of the third link that is hinged to the first leg rest also has an arc-shaped extension section. The extension section is hinged to the second leg rest and can drive the second leg rest to slide relative to the first leg rest. When the first and second leg supports need to be extended, the push rod moves forward along its axis. The push rod, by pushing the connecting shaft, extends the double four-bar linkage structure forming a "scissor fork." Simultaneously, as the third link extends, its extended section drives the second leg support to move synchronously, achieving upward rotation of the first and second leg supports relative to the seat basin and forward sliding of the second leg support relative to the first leg support. When the first and second leg supports need to be retracted, the push rod moves backward along its axis. The push rod, by dragging the connecting shaft, retracts the double four-bar linkage structure forming a "scissor fork." Simultaneously, as the third link retracts, its extended section drives the second leg support to move synchronously, achieving downward rotation of the first and second leg supports relative to the seat basin and backward sliding of the second leg support relative to the first leg support. Furthermore, the push rod is positioned along the fore-and-aft direction of the car seat and can move forward and backward relative to the seat. The longer distance the push rod can move, the more the first and second leg rests can be extended or retracted in the fore-and-aft direction. Simultaneously, the "scissor fork" double four-bar linkage structure allows for minimal vertical movement of the first and second leg rests. The first and second leg rests utilize a single push rod and pure linkage transmission structure, resulting in a simple structure. The linkage structure can withstand significant impact loads and continuous loads, with wear primarily concentrated at the hinge points of the rods after long-term use. Replacement and maintenance are simple and convenient, ensuring high reliability. Additionally, the extended first and second leg rests support the user's legs, making lying down more comfortable and thus improving the overall comfort of the car seat.

[0017] In the aforementioned car seat, the rear ends of the two connecting plates are respectively hinged to two first connecting brackets on the seat basin, and the front ends of the two connecting plates are respectively hinged to two second connecting brackets on the first leg rest via a sixth connecting rod. The upper ends of the two connecting plates are respectively hinged to a third connecting rod on the same side. The connecting plates, third connecting rod, fourth connecting rod, and first connecting brackets are hinged to form a four-bar structure. The extensions of the two third connecting rods are respectively hinged to two third connecting brackets on the second leg rest via a fifth connecting rod. A motor for driving the push rod to move back and forth is installed on the seat basin. An arc-shaped plate is fixedly connected to the connecting shaft, with the concave side of the arc-shaped plate facing downwards. The end of the push rod near the first leg rest is hinged to the arc-shaped plate. The "scissor fork" double four-bar linkage structure, formed by the hinged connection of the connecting plate, third link, fourth link, and first connecting bracket, as well as the hinged connection of the connecting plate, third link, sixth link, and second connecting bracket, can further improve the accuracy of the rotation of the leg support assembly relative to the seat basin and the sliding motion trajectory of the second leg support relative to the first leg support, as well as the reliability of the leg support structure. In addition, by setting the arc plate, the push rod can better push the connecting shaft and the connecting plate fixed on the connecting shaft to swing up and down, thereby better realizing the maximum expansion or folding of the leg support assembly in the front and back directions.

[0018] Compared with existing technologies, the advantages of this car seat are as follows: When adjusting the seat angle (i.e., the first stage of backrest frame angle adjustment) in a seated position, the linkage pins of the two backrest connecting plates only move within the slotted holes of the linkage rod and do not contact the two end edges of the slotted holes. This ensures that the linkage pins of the two backrest connecting plates do not drive the linkage rod to rotate when moving synchronously with the backrest frame, allowing the car seat to achieve independent adjustment of the backrest angle within the seated position angle range. Meanwhile, the seat cushion support rests against the seat cushion frame, preventing its descent or elevation from affecting the user's riding experience and ensuring user comfort. When the car seat is in a reclining position and the angle is adjusted (i.e., the second stage of backrest frame angle adjustment), the linkage pins of the two backrest connecting plates contact the front edge of the same-side strip hole and drive the linkage rod to rotate, thereby lifting the seat cushion support. This allows the seat cushion support to gradually rise to provide lumbar support during the transition from a sitting to a reclining position, or to gradually descend and retract under the influence of body weight during the transition from a reclining to a sitting position, avoiding a sudden loss of support and preventing a feeling of emptiness. This ensures that the user's lumbar region is supported when lying down, thus improving the comfort of the car seat. Attached Figure Description

[0019] Figure 1This is a three-dimensional structural diagram of the car seat in a sitting position (excluding the first and second leg rests).

[0020] Figure 2 This is a three-dimensional structural diagram of the car seat backrest frame after it has been rotated backward at a certain angle.

[0021] Figure 3 This is a three-dimensional structural diagram of the car seat in a reclining position (including the first and second leg rests).

[0022] Figure 4 This is a side view of the structure of the car seat in a reclining position.

[0023] Figure 5 This is a three-dimensional structural diagram of the rear cross tube of the car seat and two lead screw motors.

[0024] Figure 6 This is a three-dimensional structural diagram of the car seat cushion support, two backrest connecting plates, two first links, and two second links.

[0025] Figure 7 This is a three-dimensional structural diagram of the first and second leg rests of this car seat.

[0026] In the diagram, 1. Seat cushion frame; 1a. Seat side panel; 1b. Seat basin; 2. Backrest frame; 3. Seat cushion support; 3a. Support frame; 3a1. Front crossbar; 3a2. Rear crossbar; 3a3. Support plate; 3a4. Arc-shaped section; 3b. Elastic rod; 4. Linkage rod; 4a. Strip hole; 5. First connecting rod; 6. Second connecting rod; 7. Backrest connecting plate; 7a. Linkage pin; 7b. Mounting hole; 8. Support plate; 9. Rear cross tube; 10. Backrest plate; 11. Slide rail assembly. 12. Drive rod; 13. Lead screw motor; 13a. Lead screw; 14. Rear connecting rod; 15. Angle adjuster; 16. Linkage rod; 17. First leg support; 18. Second leg support; 19. Push rod; 20. Connecting shaft; 21. Connecting plate; 22. Third connecting rod; 22a. Extension section; 23. Fourth connecting rod; 24. Fifth connecting rod; 25. Sixth connecting rod; 26. First connecting bracket; 27. Second connecting bracket; 28. Third connecting bracket; 29. ​​Arc plate; 30. Motor. Detailed Implementation

[0027] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0028] A type of car seat, reference Figure 1-7The system includes a seat cushion frame 1 and a backrest frame 2 rotatably connected to the seat cushion frame 1. The seat cushion frame 1 includes two seat side panels 1a arranged opposite each other and a seat basin 1b connected between the two seat side panels 1a. A seat cushion support 3 and two linkage rods 4 are also provided between the two seat side panels 1a. The front ends of the seat cushion support 3 are respectively hinged to the front ends of the two seat side panels 1a by first connecting rods 5. The linkage rods 4 are inverted V-shaped, and the middle parts of the linkage rods 4 are respectively hinged to the rear ends of the two seat side panels 1a by second connecting rods 6. The front ends of the two linkage rods 4 are respectively fixed to the seat cushion support 3. On both sides of the rear end, the rear ends of the two linkage rods 4 are respectively provided with strip holes 4a opened in the front-back direction. The lower ends of the backrest frame 2 are respectively fixed with vertically arranged backrest connecting plates 7. The lower ends of the two backrest connecting plates 7 are respectively provided with horizontally arranged linkage pins 7a. The two linkage pins 7a are respectively inserted into the strip holes 4a of the two linkage rods 4. The seat cushion support 3 abuts against the seat cushion frame 1, and when the backrest frame 2 rotates, it can drive the linkage pins 7a to abut against the front edge of the strip holes 4a, and drive the rotation of the linkage rods 4 through the linkage pins 7a to drive the seat cushion support 3 to be lifted.

[0029] Reference Figure 6 Specifically, the upper end of the second connecting rod 6 is hinged to the bend of the linkage rod 4, and the second connecting rod 6 is inclined from top to bottom and from back to front. The upper end of the backrest connecting plate 7 has a mounting hole 7b. The strip hole 4a is arc-shaped with the center of the mounting hole 7b of the backrest connecting plate 7 as the center, and the linkage pin 7a can be abutted against the end edge of the strip hole 4a.

[0030] Reference Figure 1 and Figure 6 More specifically, the two ends of the strip hole 4a are both arc-shaped, the linkage pin 7a is cylindrical, and the left and right sides of the lower end of the backrest frame 2 are respectively provided with an angle adjuster 15, and a linkage rod 16 is provided between the two angle adjusters 15. The center line connecting the two backrest connecting plates 7 mounting holes 7b coincides with the center line of the linkage rod 16.

[0031] Reference Figure 6 Specifically, the front end of the seat cushion support 3 is located below the seat basin 1b, and a rear horizontal tube 9 is connected between the rear ends of the two seat side panels 1a. A backing plate 10 parallel to the rear horizontal tube 9 is fixedly connected to the rear side of the seat cushion support 3, and when the backrest frame 2 rotates forward, the backing plate 10 can abut against the rear horizontal tube 9 vertically.

[0032] Reference Figure 6More specifically, the seat support 3 includes a U-shaped support frame 3a and several elastic rods 3b arranged side by side. The two ends of the elastic rods 3b are respectively fixed to the front and rear ends of the support frame 3a. The elastic rods 3b are connected to each other by several horizontally arranged support plates 8. The leftmost and rightmost elastic rods 3b are respectively fixed to the left and right sides of the support frame 3a. The support frame 3a includes a front crossbar 3a1 and a rear crossbar 3a2 arranged at intervals. The ends of the front crossbar 3a1 and the rear crossbar 3a2 on the same side are connected by a vertically arranged support plate 3a3. The support plate 3a3 is long and has a downwardly curved arc segment 3a4 at the front end. The arc segment 3a4 is hinged to the first connecting rod 5. The front ends of the two linkage rods 4 are respectively hinged to the two ends of the rear crossbar 3a2.

[0033] Reference Figure 6 More specifically, the elastic rods 3b are all bent back and forth in the front-to-back direction. The rear ends of the elastic rods 3b extend backward from the abutment plate 10 and are fixed to the abutment plate 10. The part of the elastic rod 3b extending out of the abutment plate 10 is in a downward curved arc shape. When the backrest frame 2 rotates forward, the part of the elastic rod 3b extending out of the abutment plate 10 and the abutment plate 10 can simultaneously abut against the rear horizontal tube 9.

[0034] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 Specifically, a slide rail assembly 11 is provided below the seat cushion frame 1. A drive rod 12 and two lead screw motors 13 are also installed on the seat cushion frame 1. Rear connecting rods 14 are fixed to both ends of the rear cross tube 9. The lower ends of the two rear connecting rods 14 are respectively hinged to the slide rail assembly 11. One end of each drive rod 12 is hinged to the rear connecting rod 14 on the same side. The other end of each drive rod 12 is sleeved on the lead screw 13a of the lead screw motor 13 on the same side and threadedly connected to the lead screw 13a.

[0035] Reference Figure 3 , Figure 4 and Figure 7Furthermore, the seat basin 1b is also provided with a first leg rest 17, a second leg rest 18 slidably connected to the first leg rest 17, a push rod 19 arranged along the front-rear direction of the car seat and movable relative to the front-rear direction of the car seat, and a connecting shaft 20 arranged along the left-right direction of the car seat and hinged to the push rod 19. The two ends of the connecting shaft 20 are respectively fixedly connected to connecting plates 21. A third connecting rod 22 and a sixth connecting rod 25 are respectively hinged to the connecting plates 21. The third connecting rod 22 is arranged crosswise with the connecting plate 21 and is hinged to a fourth connecting rod 23. The fourth connecting rod 23 and the connecting plate 21 both face the end of the seat basin 1b. The connecting plate 21, the third link 22, the fourth link 23, and the seat 1b are respectively hinged to the basin 1b. The four components of the connecting plate 21, the third link 22, the sixth link 25, and the basin 1b form a four-bar structure. The ends of the third link 22 and the sixth link 25 facing the first leg support 17 are respectively hinged to the first leg support 17. The four components of the connecting plate 21, the third link 22, the sixth link 25, and the first leg support 17 also form a four-bar structure. The end of the third link 22 that is hinged to the first leg support 17 also has an arc-shaped extension 22a. The extension 22a is hinged to the second leg support 18 and can drive the second leg support 18 to slide relative to the first leg support 17.

[0036] Reference Figure 3 , Figure 4 and Figure 7 Specifically, the rear ends of the two connecting plates 21 are respectively hinged to the two first connecting brackets 26 on the seat basin 1b, and the front ends of the two connecting plates 21 are respectively hinged to the two second connecting brackets 27 on the first leg support 17 via the sixth connecting rod 25. The upper ends of the two connecting plates 21 are respectively hinged to the third connecting rod 22 on the same side. The connecting plates 21, the third connecting rod 22, the fourth connecting rod 23, and the first connecting brackets 26 form a four-bar linkage structure after being hinged. The sixth link 25 and the second connecting bracket 27 are hinged together to form a four-bar structure. The extensions 22a of the two third links 22 are respectively hinged to the two third connecting brackets 28 on the second leg support 18 through the fifth link 24. A motor 30 for driving the push rod 19 to move back and forth is installed on the seat basin 1b. An arc plate 29 is fixedly connected to the connecting shaft 20. The concave side of the arc plate 29 is set downward. The end of the push rod 19 near the first leg support 17 is hinged to the arc plate 29.

[0037] The following explains the working principle of this car seat:

[0038] like Figure 1 and Figure 2 As shown, where Figure 1 This is a diagram illustrating the seating positions in a car. Figure 2This is the critical position of the car seat from a sitting to a reclining position. The car seat adjusts its angle from the sitting position (i.e., from...) Figures 1 to 2 When the seat is adjusted (belonging to the seat angle adjustment stage and the first stage of backrest frame angle adjustment), the backrest frame 2 rotates backward relative to the seat cushion frame 1. The linkage pins 7a of the two backrest connecting plates 7 follow the movement of the backrest frame 2. However, the linkage pins 7a only move within the strip hole 4a of the linkage rod 4 and do not contact the two end edges of the strip hole 4a. That is, the linkage pins 7a will not drive the linkage rod 4 to rotate, so that the car seat can achieve independent adjustment of the backrest angle within the seat posture angle range (i.e., the first stage of backrest frame angle adjustment). This avoids the seat cushion support 3 from lowering or raising and affecting the user's riding experience, thereby ensuring the user's riding comfort.

[0039] like Figure 3 and Figure 4 As shown, when the car seat switches from a sitting / reclining state to a reclining state (i.e., from a sitting / reclining state to a reclining state), Figures 2 to 3 When adjusting the backrest position (belonging to the reclining angle adjustment stage and the second stage of backrest frame angle adjustment), the backrest frame 2 further rotates backward relative to the seat cushion frame 1. The linkage pins 7a of the two backrest connecting plates 7 contact the front edge of the strip hole 4a and drive the linkage rod 4 to rotate, thereby lifting the seat cushion support 3 (it should be noted that at this time, the rear end of the seat cushion support 3 is lifted upward, and the front end of the seat cushion support 3 is slightly lowered downward, realizing the overall lifting of the seat cushion support 3). This allows the seat cushion support 3 to gradually provide support for the user's waist during the transition from the extreme sitting position to the reclining position, reducing the stress on the waist muscles and increasing comfort.

[0040] When a car seat switches from a reclining position to a near-reclining position (i.e., from...) Figures 3 to 2 When adjusting the backrest position (belonging to the reclining angle recovery adjustment stage), the backrest frame 2 gradually rotates forward relative to the seat cushion frame 1. The linkage pins 7a of the two backrest connecting plates 7 rotate synchronously with the backrest frame 2. At this time, the user's waist acts on the rear crossbar 3a2 of the seat cushion support 3, driving the linkage rod 4 to rotate synchronously until the front edge of the strip hole 4a contacts the linkage pin 7a of the backrest connecting plate 7. Therefore, at this time, the rear end of the seat cushion support 3 can still provide a certain amount of support as it gradually descends (the front edge of the strip hole 4a and the linkage pin 7a of the backrest connecting plate 7 continuously contact each other during the rotation). That is, during the process of switching from the reclining position to the sitting reclining critical state, the seat cushion support 3 gradually returns to its original position and is removed, avoiding the sudden removal of support and the resulting feeling of emptiness. This solves the problem that the waist of the existing car seat is in a significantly unsupported state when the user is lying flat.

[0041] Finally, when the car seat switches from a reclining state to a sitting position (i.e., from a recumbent state to a seated state), Figures 2 to 1When the backrest frame 2 is adjusted (belonging to the seat angle recovery adjustment stage), it rotates further forward relative to the seat cushion frame 1. The linkage pins 7a of the two backrest connecting plates 7 rotate synchronously with the backrest frame 2. Due to the change in human posture, the user's buttocks act on the rear crossbar 3a2 of the seat cushion support 3, driving the linkage rod 4 to rotate synchronously (while the user's waist is completely detached from the seat cushion support 3). This continues until the front edge of the strip hole 4a contacts the linkage pin 7a of the backrest connecting plate 7. Furthermore, when the seat cushion support 3 descends to abut against the rear crossbar 9 of the seat cushion frame 1, even under the action of human weight, the seat cushion support 3 cannot descend further. The backrest frame 2 rotates further forward relative to the seat cushion frame 1. Figure 1 In this state, the linkage pin 7a disengages from the front edge of the strip hole 4a.

[0042] Additionally, refer to Figure 4 and Figure 7 When the first leg rest 17 and the second leg rest 18 of this car seat need to be unfolded, the motor 30 drives the push rod 19 to move forward along the axial direction of the push rod 19. The push rod 19 pushes the connecting shaft 20 and the connecting plate 21 fixed on the connecting shaft 20 to swing upward through the arc plate 29. Then, the connecting plate 21 drags the third link 22 and the sixth link 25, which are hinged to it, to swing together around the hinge axis between the connecting plate 21 and the first connecting bracket 26. At the same time, the third link 22 and the sixth link 25 rotate around their respective hinge points. Since the distance from the hinge point of the connecting plate 21 and the sixth link 25 to the hinge point of the connecting plate 21 and the first connecting bracket 26 is greater than the distance from the hinge point of the connecting plate 21 and the third link 22 to the hinge point of the first connecting bracket 26, the connection point of the connecting plate 21 and the sixth link 25 is greater than the distance from the hinge point of the connecting plate 21 and the third link 22 to the hinge point of the first connecting bracket 26. The distance between the connecting plate 21 and the hinge point of the first connecting bracket 26 is such that the linear velocity of the sixth link 25 is greater than that of the third link 22. The third link 22 and the sixth link 25 are respectively hinged to the second connecting bracket 27, so that the linear velocity at the hinge point of the sixth link 25 and the second connecting bracket 27 is greater than that at the hinge point of the third link 22 and the second connecting bracket 27. This causes the second connecting bracket 27 to rotate around its hinge axis with the sixth link 25 and drive the first leg support 17 to rotate synchronously. At the same time, the second leg support 18, which is slidably connected to the first leg support 17, can move synchronously with the first leg support 17, thereby realizing that the first leg support 17 and the second leg support 18 swing synchronously at the same angle.

[0043] Meanwhile, the third link 22 is connected to the first connecting bracket 26 via the second link 23, and to the third connecting bracket 28 via the third link 24. The distance between the hinge point of the third link 22 and the third link 24 and the hinge point of the second link 23 and the first connecting bracket 26 is much greater than the distance between the hinge point of the sixth link 25 and the second connecting bracket 27 and the hinge point of the connecting plate 21 and the first connecting bracket 26. Therefore, during swinging, the linear velocity at the hinge point of the third link 22 and the third link 24 is greater than the linear velocity at the hinge point of the second connecting bracket 27 and the sixth link 25. This creates a velocity difference between the first leg rest 17 and the second leg rest 18, thereby achieving the effect of the second leg rest 18 sliding forward relative to the first leg rest 17. When the first leg rest 17 and the second leg rest 18 of this pure linkage car seat need to be folded, the motor 30 drives the push rod 19 to move backward in the opposite direction along the axis of the push rod 19.

[0044] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A car seat comprising a seat cushion framework (1) and a backrest framework (2) rotatably connected to the seat cushion framework (1), the seat cushion framework (1) comprising two seat side plates (1a) disposed opposite to each other and a seat pan (1b) connected between the two seat side plates (1a), characterized in that, A seat cushion support (3) and two linkage rods (4) are also provided between the two seat side panels (1a). The front ends of the seat cushion support (3) are respectively hinged to the front ends of the two seat side panels (1a) via first connecting rods (5). The linkage rods (4) are inverted V-shaped. The middle parts of the linkage rods (4) are respectively hinged to the rear ends of the two seat side panels (1a) via second connecting rods (6). The front ends of the two linkage rods (4) are respectively hinged to the rear ends of the seat cushion support (3). The rear end of the linkage rod (4) has a strip hole (4a) opened in the front-back direction. The lower ends of the backrest frame (2) are respectively fixed with vertically arranged backrest connecting plates (7). The lower ends of the two backrest connecting plates (7) each have a horizontally arranged linkage pin (7a). The two linkage pins (7a) are respectively inserted into the strip holes (4a) of the two linkage rods (4). The upper end of the second connecting rod (6) is hinged to the bend of the linkage rod (4) and the second connecting rod (6) is from the top. The backrest frame (7) is inclined from back to front. The upper end of the backrest connecting plate (7) has a mounting hole (7b). The strip hole (4a) is arc-shaped with the center of the mounting hole (7b) of the backrest connecting plate (7) as the center. The linkage pin (7a) can be set close to the end edge of the strip hole (4a). The two end edges of the strip hole (4a) are arc-shaped. The linkage pin (7a) is cylindrical. Angle adjusters (15) are respectively provided on the left and right sides of the lower end of the backrest frame (2). A linkage rod (16) is provided between the two angle adjusters (15), and the center line connecting the mounting holes (7b) of the two backrest connecting plates (7) coincides with the center line of the linkage rod (16); the seat cushion support (3) abuts against the seat cushion frame (1), and when the backrest frame (2) rotates, it can drive the linkage pin (7a) to abut against the front edge of the strip hole (4a), and drive the linkage rod (4) to rotate through the linkage pin (7a) to drive the seat cushion support (3) to rise.

2. The car seat according to claim 1, characterized in that, The front end of the seat cushion support (3) is located below the seat basin (1b), and a rear cross tube (9) is connected between the rear ends of the two seat side panels (1a). A backing plate (10) parallel to the rear cross tube (9) is fixedly connected to the rear side of the seat cushion support (3), and when the backrest frame (2) rotates forward, the backing plate (10) can abut against the rear cross tube (9) vertically.

3. A car seat according to claim 2, characterized in that, The seat support (3) includes a support frame (3a) in the shape of a square and several elastic rods (3b) arranged side by side. The two ends of the elastic rods (3b) are respectively fixed to the front and rear ends of the support frame (3a). The elastic rods (3b) are connected to each other by several horizontally arranged support plates (8). The leftmost and rightmost elastic rods (3b) are respectively fixed to the left and right sides of the support frame (3a).

4. A car seat according to claim 3, characterized in that, The elastic rods (3b) are all bent back and forth in the front-to-back direction. The rear end of each elastic rod (3b) extends backward out of the abutment plate (10) and is fixed to the abutment plate (10). The part of the elastic rod (3b) extending out of the abutment plate (10) is in a downward curved arc shape. When the backrest frame (2) rotates forward, the part of the elastic rod (3b) extending out of the abutment plate (10) and the abutment plate (10) can simultaneously abut against the rear horizontal tube (9).

5. A car seat according to claim 3, characterized in that, The support frame (3a) includes a front crossbar (3a1) and a rear crossbar (3a2) spaced apart. The ends of the front crossbar (3a1) and the rear crossbar (3a2) on the same side are connected by a vertically arranged support plate (3a3). The support plate (3a3) is long and has a downwardly curved arc segment (3a4) at the front end. The arc segment (3a4) is hinged to the first connecting rod (5). The front ends of the two linkage rods (4) are respectively hinged to the two ends of the rear crossbar (3a2).

6. A car seat according to claim 2, characterized in that, A slide rail assembly (11) is provided below the seat cushion frame (1). A drive rod (12) and two lead screw motors (13) are also installed on the seat cushion frame (1). The two ends of the rear horizontal tube (9) are respectively fixedly connected to the rear connecting rods (14). The lower ends of the two rear connecting rods (14) are respectively hinged to the slide rail assembly (11). One end of the drive rod (12) is hinged to the rear connecting rod (14) on the same side. The other end of the drive rod (12) is sleeved on the lead screw (13a) of the lead screw motor (13) on the same side and threadedly connected to the lead screw (13a).

7. A car seat according to claim 1, characterized in that, The seat basin (1b) is also provided with a first leg rest (17), a second leg rest (18) slidably connected to the first leg rest (17), a push rod (19) arranged along the front-back direction of the car seat and movable relative to the front-back direction of the car seat, and a connecting shaft (20) arranged along the left-right direction of the car seat and hinged to the push rod (19). The two ends of the connecting shaft (20) are respectively fixedly connected to the connecting plate (21). The connecting plate (21) is respectively hinged to the third connecting rod (22) and the sixth connecting rod (25). The third connecting rod (22) is arranged crosswise with the connecting plate (21) and is hinged to the fourth connecting rod (23). The ends of the fourth connecting rod (23) and the connecting plate (21) facing the seat basin (1b) are respectively connected to the connecting rod (18). The seat (1b) is hinged, and the connecting plate (21), the third link (22), the fourth link (23) and the seat (1b) form a four-bar structure. The ends of the third link (22) and the sixth link (25) facing the first leg support (17) are respectively hinged to the first leg support (17). The connecting plate (21), the third link (22), the sixth link (25) and the first leg support (17) also form a four-bar structure. The end of the third link (22) that is hinged to the first leg support (17) also has an arc-shaped extension (22a). The extension (22a) is hinged to the second leg support (18) and can drive the second leg support (18) to slide relative to the first leg support (17).

8. A car seat according to claim 7, characterized in that, The rear ends of the two connecting plates (21) are respectively hinged to the two first connecting brackets (26) on the seat basin (1b). The front ends of the two connecting plates (21) are respectively hinged to the two second connecting brackets (27) on the first leg rest (17) via the sixth connecting rod (25). The upper ends of the two connecting plates (21) are respectively hinged to the third connecting rod (22) on the same side. The connecting plates (21), the third connecting rod (22), the fourth connecting rod (23) and the first connecting bracket (26) are hinged to form a four-bar structure. The rod (25) and the second connecting bracket (27) are hinged together to form a four-bar structure. The extensions (22a) of the two third connecting rods (22) are respectively hinged to the two third connecting brackets (28) on the second leg support (18) through the fifth connecting rod (24). A motor (30) for driving the push rod (19) to move back and forth is installed on the seat basin (1b). An arc plate (29) is fixed on the connecting shaft (20). The concave side of the arc plate (29) is set downward. The end of the push rod (19) near the first leg support (17) is hinged to the arc plate (29).

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