Automobile rear side seat capable of being converted into a flat seat

Abstract

This invention belongs to the field of seat technology, and particularly relates to a car rear seat that can be modified to fold flat. It includes connecting lugs, a rear seat base, mounting lugs, a first limiting mechanism, a rear seat backrest, and a second limiting mechanism. Existing vehicle bodies have a raised area on the bottom surface of the front side of the rear seat. In order to prevent the raised area from affecting the folding of the rear seat, a space needs to be left on the rear seat backrest to accommodate the raised area. When the rear seat backrest is folded, the two top elastic side pads fold relative to the bottom elastic pad. After folding, a concave area is formed between the two top elastic side pads. After the rear seat is fully folded down, this concave area corresponds exactly to the raised area on the bottom surface. This design makes the improved seat of this invention highly adaptable.

Description

Technical Field

[0001] This invention belongs to the field of seat technology, and in particular relates to a rear seat of a car that can be modified to lie flat. Background Technology

[0002] Most SUVs have rear seats that can be fully or partially folded down, but most of these seats cannot create a flat surface in the trunk after being folded down, which more or less affects the use of the trunk.

[0003] There are two existing technologies for folding down the rear seats: one is as follows Figure 11 As shown in 'a', leaning forward with your back allows you to fully recline; another method is as follows: Figure 11 As shown in b, the rear seat backrest is folded down first and then tilted forward to flatten it. However, this method cannot make the rear seat completely flush with the bottom of the trunk, meaning that the bottom of the trunk cannot be completely flattened, and the space of the rear seat cannot be fully utilized.

[0004] In addition, the inside of the rear seat back should have an impact-resistant steel plate, but existing cars do not add a steel plate to the back to reduce costs; this is very dangerous when subjected to an impact.

[0005] For the two reasons mentioned above, the rear seats need to be modified to ensure comfort. In order to reduce assembly costs, the rear seats should be compatible with the two installation methods mentioned above, and the trunk and the bottom of the rear seats should be flat when folded down.

[0006] This invention is a modification of the rear seats, which can achieve a flat, step-free rear bottom surface when folded down and has impact resistance. Summary of the Invention

[0007] To achieve the above objectives, the present invention employs the following technical solutions:

[0008] A car rear seat that can be modified to fold flat includes connecting lugs, a rear seat base, mounting lugs, a first limiting mechanism, a rear seat backrest, and a second limiting mechanism. Three mounting lugs are welded to the vehicle body under the rear seat. Each of the three mounting lugs has a connecting lug hinged to it. The rear seat base is mounted on the three connecting lugs, and the three connecting lugs are hinged to the rear seat base. Three fixed lugs are slidably mounted on the upper rear surface of the rear seat base. The first limiting mechanism is installed between the two fixed lugs near the sides and the rear seat base. The rear seat backrest is sway-mounted on the three fixed lugs. Two second limiting mechanisms are installed between the rear seat backrest and the two fixed lugs on the sides.

[0009] The rear seat backrest includes a top impact-resistant area, a limiting plate, a bottom impact-resistant area, a top elastic pad, an impact-resistant component, and a bottom elastic pad. The bottom elastic pad is hinged to three fixed lugs, and the bottom impact-resistant area is fixedly installed on the rear side of the bottom elastic pad. The top elastic pad is installed on the upper side of the bottom elastic pad, and the top impact-resistant area is fixedly installed on the rear side of the top elastic pad. A limiting plate is installed on the rear side of the top impact-resistant area, limiting the movement of the top and bottom impact-resistant areas. Impact-resistant components are installed in both the top and bottom impact-resistant areas.

[0010] The impact-resistant assembly includes a first impact-resistant plate, a second impact-resistant plate, a third impact-resistant plate, and a support column. The first impact plate, the second impact plate, and the third impact plate are installed sequentially from front to back inside the impact area. Adjacent impact plates and the impact plates and the inner wall of the impact area are separated from each other by the support column. The first impact plate and the third impact plate are corrugated plates. The second impact plate has evenly distributed circular concave areas on both sides, and adjacent concave areas are connected by an arc transition.

[0011] As a preferred embodiment, the top elastic pad is composed of a middle elastic pad and two top elastic side pads symmetrically distributed on both sides of the middle elastic pad; the two top elastic side pads are fixedly connected to the top impact-resistant area, and the middle elastic pad is fixedly connected to the bottom elastic pad.

[0012] As a preferred embodiment, two guide rods are slidably installed on the rear side of the top impact-resistant area, a limiting plate is fixedly installed on the two guide rods, and a threaded rod is rotatably installed on the rear side of the top impact-resistant area. The threaded rod is threadedly connected to the top impact-resistant area, and the lower end of the threaded rod is connected to the limiting plate through a rotating component.

[0013] As a preferred embodiment, the corrugated and concave regions on the first, second, and third impact plates are staggered.

[0014] As a preferred embodiment, the first limiting mechanism includes a first rack, a second rack, a first gear, and a first spring. The first rack is laterally slidably installed in the rear seat base, and a first spring is installed between the first rack and the rear seat base. The first gear is rotatably installed in the rear seat base and meshes with the first rack. The second rack is vertically slidably installed in the rear seat base and engages with a corresponding fixed lug. The fixed lug has a limiting groove that engages with the second rack. The second rack meshes with the first gear.

[0015] As a preferred embodiment, the second limiting mechanism includes a third rack, a second gear, a second spring, and a fourth rack. The fourth rack is laterally slidably installed within the bottom elastic pad of the rear seat backrest, and the second spring is installed between the fourth rack and the bottom elastic pad. The second gear is rotatably installed within the bottom elastic pad of the rear seat backrest, and the second gear meshes with the fourth rack. The third rack is vertically slidably installed within the bottom elastic pad of the rear seat backrest, and the third rack engages with a corresponding fixed lug. The fixed lug has a limiting groove that engages with the third rack. The third rack meshes with the second gear.

[0016] Compared with existing technologies, the advantages of this invention are:

[0017] 1. The rear seat designed in this invention can adapt to two car rear seat arrangements: one with and one without a step. For rear seats with a step, when folding down, the second limiting mechanism is released from the limit on the rear seat back, and the rear seat back is folded 90 degrees relative to the rear seat base. This method is the same as the existing method for folding down car rear seats with steps. For rear seat arrangements without installed steps, when folding down, the upper and lower parts of the rear seat backrest are first controlled to fold 180 degrees. After the rear seat backrest is folded, the second limiting mechanism is released from the limit on the rear seat backrest, and the rear seat backrest is folded 90 degrees relative to the rear seat base. The front seats are then adjusted forward. After that, the first limiting mechanism is released from the limit on the fixed bracket, and the rear seat is controlled to swing forward relative to the mounting bracket, while the mounting bracket is controlled to slide forward. This makes the upper part of the rear seat flush with the bottom of the trunk after swinging. Then, the rear seat is pushed so that the middle elastic area is inserted into the groove opened on the lower side of the rear seat body. At this time, the rear seat adjustment is completed, and the top elastic pad of the rear seat at the bottom is in close contact with the bottom surface of the front side passage of the rear seat. The adjusted rear seat is relatively stable.

[0018] 2. This invention utilizes a three-layer impact plate design to increase the penetration resistance of the rear seats when impacted, thus better protecting the occupants. In this invention, both the first and third impact plates are corrugated plates. The function of the corrugated plates is to guide the rod-shaped impactor from vertical insertion (front-to-back) to oblique insertion (left-to-right) under the guidance of the corrugations, changing the insertion direction of the rod-shaped impactor. Furthermore, under the guidance of the corrugated plates, the obliquely inserted rod-shaped impactor slides along the length of the grooves on the corrugated plates to the left and right sides, thus buffering and changing the direction of the impact force. The various second impact plates of this invention have uniformly distributed circular concave regions on both sides, with an arc transition between adjacent concave regions; the corrugations and concave regions on the first, second, and third impact plates are staggered; this design ensures that a rod-shaped impactor inserted from the third impact plate is guided by the concave region on the second impact plate and inserted from the innermost recess of the concave region, which is directly opposite the corrugated inclined surface of the first impact plate. Thus, the rod-shaped impactor inserted from the second impact plate will slide obliquely along the corrugated groove of the first impact plate under the corrugated inclined surface, that is, the rod-shaped impactor is guided obliquely again, preventing the rod-shaped impactor from causing vertical insertion injury to the person. At the same time, the two oblique guidances will cause deformation of the third and second impact plates, which also plays a buffering role.

[0019] 3. Existing vehicle bodies have a raised area on the bottom surface of the front side of the rear seats. In order to prevent the raised area from affecting the folding of the rear seats, it is necessary to leave a space on the rear seat back to accommodate the raised area. When the rear seat back is folded, the two top elastic side pads will fold relative to the bottom elastic pad. After folding, a concave area is formed between the two top elastic side pads. After the rear seats are fully folded down, this concave area corresponds exactly to the raised area on the bottom surface. This design makes the improved seat of the present invention highly adaptable. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall component appearance.

[0021] Figure 2 This is a schematic diagram of the overall component distribution.

[0022] Figure 3 This is a schematic diagram of the installation of the first limit mechanism.

[0023] Figure 4 This is a schematic diagram of the first limiting mechanism.

[0024] Figure 5 This is a diagram showing the installation of the rear seat backrest.

[0025] Figure 6 This is a schematic diagram of the distribution of the second limiting mechanism.

[0026] Figure 7 This is a schematic diagram of the installation of the second limit mechanism.

[0027] Figure 8 This is a schematic diagram of the second limiting mechanism.

[0028] Figure 9 This is a schematic diagram of the rear seat backrest structure.

[0029] Figure 10 This is a schematic diagram of the impact protection component structure.

[0030] Figure 11 This is a schematic diagram illustrating the working principle.

[0031] Figure 12 This is a schematic diagram of the second impact protection plate structure.

[0032] Figure 13 This is a schematic diagram of the impact plate distribution.

[0033] Labels in the diagram: 1. Vehicle body; 2. Front seat; 3. Rear seat; 4. Protrusion; 5. Connecting lug; 6. Rear seat base; 7. Mounting lug; 8. First limiting mechanism; 9. First rack; 10. Second rack; 11. First gear; 12. First spring; 13. Rear seat backrest; 14. Bottom elastic pad; 15. Fixed lug; 16. Second limiting mechanism; 17. Third rack; 18. Second gear; 19. Second spring; 20. Fourth rack; 21. Top impact-resistant area; 22. Screw; 23. Guide rod; 24. Limiting plate; 25. Bottom impact-resistant area; 26. Top elastic side pad; 27. Middle elastic area; 29. ​​Impact-resistant component; 30. First impact-resistant plate; 31. Second impact-resistant plate; 32. Third impact-resistant plate; 33. Support column; 34. Concave area. Detailed Implementation

[0034] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following embodiments and drawings are used to illustrate the present invention, but are not intended to limit the scope of the invention.

[0035] A type of rear seat in a car that can be modified to fold flat, such as... Figure 1 , 2 As shown in Figures 3, 5, and 6, it includes a connecting lug 5, a rear seat base 6, mounting lugs 7, a first limiting mechanism 8, a rear seat backrest 13, and a second limiting mechanism 16. Three mounting lugs 7 are welded to the vehicle body 1 below the rear seat 3. Each of the three mounting lugs 7 has a connecting lug 5 hinged to it. Figure 4 As shown, the rear seat base 6 is mounted on three connecting lugs 5, and the three connecting lugs 5 are connected to the rear seat base 6 by a hinge; Figure 3 , 5As shown in Figure 6, three fixed lugs 15 are slidably installed on the upper surface of the rear side of the rear seat base 6, and a first limiting mechanism 8 is installed between the two fixed lugs 15 near the two sides and the rear seat base 6; the rear seat backrest 13 is sway-mounted on the three fixed lugs 15; and two second limiting mechanisms 16 are installed between the rear seat backrest 13 and the two fixed lugs 15 located on the two sides.

[0036] like Figure 9 As shown, the rear seat backrest 13 includes a top anti-impact area 21, a screw 22, a guide rod 23, a limiting plate 24, a bottom anti-impact area 25, a top elastic side pad 26, a middle elastic area 27, an anti-impact component 29, and a bottom elastic pad 14. The bottom elastic pad 14 is hinged to three fixed lugs 15. The middle elastic area 27 is fixed to the middle area on the upper side of the bottom elastic pad 14. The bottom anti-impact area 25 is fixedly installed on the rear side of the bottom elastic pad 14. Two top elastic side pads 26 are symmetrically installed on the upper side of the bottom elastic pad 14, located on both sides of the middle elastic area 27. A top impact-resistant area 21 is fixedly installed on the rear side of the pad 26; the top impact-resistant area 21 and the bottom impact-resistant area 25 are connected by a hinge; two guide rods 23 are slidably installed on the rear side of the top impact-resistant area 21, and a limiting plate 24 is fixedly installed on the two guide rods 23; a threaded rod is rotatably installed on the rear side of the top impact-resistant area 21, and the threaded rod is threadedly connected to the top impact-resistant area 21; the lower end of the threaded rod is connected to the limiting plate 24 through a rotating component; the limiting plate 24 limits the top impact-resistant area 21 and the bottom impact-resistant area 25; impact-resistant components 29 are installed in both the top impact-resistant area 21 and the bottom impact-resistant area 25.

[0037] The existing vehicle body 1 has a raised area 4 on the bottom surface of the front side of the rear seat. Because the rear seat 3 designed in this invention will fold down the upper and lower parts of the rear seat back 13 first when the rear seat 3 is folded down, in order to prevent the raised area 4 from affecting the folding down of the rear seat 3, a space needs to be left on the rear seat back 13 to accommodate the raised area 4. In this invention, the elastic pad part on the front side of the rear seat back 13 is divided into upper and lower areas, and the upper top elastic pad is composed of a middle elastic area 27 and two top elastic side pads 26 on both sides. The top impact-resistant area 21 is fixed to the two top elastic side pads 26. The middle elastic area 27 is fixedly connected to the bottom elastic pad 14. When the rear seat back 13 is folded down, the two top elastic side pads 26 will fold relative to the bottom elastic pad 14. After folding, a concave area is formed between the two top elastic side pads 26. After the rear seat 3 is fully folded down, this concave area corresponds exactly to the raised area 4 on the bottom surface.

[0038] To solve the above problems, the middle elastic area 27 of the top elastic pad is fixedly connected to the bottom elastic pad 14. When the rear seat backrest 13 is folded, the two top elastic side pads 26 will fold relative to the bottom elastic pad 14, forming a concave area between the two top elastic side pads 26 after folding. Although this method solves the above problems, the middle elastic area 27 will interfere with the lower side of the rear seat body 1 when the rear seat 3 is folded. In order to solve this problem, the present invention designs the installation method of the fixed bracket 15 for installing the rear seat 3 as a sliding installation while meeting the above requirements. The fixed bracket 15 is slidably installed on the rear seat base 6. When the rear seat 3 is folded down, the two first limiting mechanisms 8 are released from limiting the fixed bracket 15, and the fixed bracket 15 is controlled to drive the rear seat backrest 13 to slide outward relative to the rear seat base 6, so that the middle elastic area 27 can swing to the front side of the lower side of the rear seat body 1 and then insert into the lower side of the rear seat body 1. In the present invention, a groove for the middle elastic area 27 to be inserted is opened in the lower side of the rear seat body 1.

[0039] In this invention, the elastic pad on the front side of the rear seat 3 and the elastic area 27 in the middle can increase the comfort of the rear seats.

[0040] In this invention, the guide rod 23 guides the limiting plate 24 and controls the rotation of the threaded rod. Under the action of the thread, the threaded rod will slide relative to the top anti-impact area 21. The sliding of the screw 22 drives the limiting plate 24 to slide, thereby realizing whether the limiting plate 24 limits the swing of the upper and lower parts of the rear seat 3.

[0041] The upper part of the seat back consists of the top impact-resistant area 21, the two top elastic side pads 26, and the middle elastic area 27, while the lower part of the seat back consists of the bottom impact-resistant area 25 and the bottom elastic pad 14. The top impact-resistant area 21 and the two top elastic side pads 26 can swing relative to the bottom impact-resistant area 25, the bottom elastic pad 14, and the middle elastic pad.

[0042] The rear seat 3 designed in this invention can adapt to, for example Figure 11 a and Figure 11 In the two scenarios of rear seat arrangement in the car, b, for example... Figure 11 As shown in diagram 'a', when the rear seat is folded down, the second limiting mechanism 16 releases its restriction on the rear seat backrest 13, allowing the rear seat backrest 13 to be folded 90 degrees relative to the rear seat base 6. This method is similar to... Figure 11 The rear seats of the existing cars shown in Figure 'a' fold down in the same way. For example... Figure 11As shown in b, the rear seat arrangement, when folded down, first controls the upper and lower parts of the rear seat backrest 13 to fold 180 degrees. After the rear seat backrest 13 is folded, the second limiting mechanism 16 releases the restriction on the rear seat backrest 13, folding the rear seat backrest 13 relative to the rear seat base 6 by 90 degrees, adjusting the front seat 2 forward. Then, the first limiting mechanism 8 releases the restriction on the fixed bracket 15, controlling the rear seat 3 to swing forward relative to the mounting bracket 7, while simultaneously controlling the mounting bracket 7 to slide forward; so that the upper part of the swung rear seat 3 is flush with the bottom of the trunk. Then, push the rear seat 3 so that the middle elastic area 27 inserts into the groove opened on the lower side of the rear seat body 1. At this time, the rear seat 3 adjustment is completed, as shown in the image. Figure 11 As shown in c, at this time, the rear seat 3 is at the bottom with the top elastic pad tightly against the bottom surface of the front side passage of the rear seat, and the adjusted rear seat 3 is relatively stable.

[0043] like Figure 10 As shown, the impact-resistant assembly 29 includes a first impact-resistant plate 30, a second impact-resistant plate 31, a third impact-resistant plate 32, and a support column 33. The first, second, and third impact plates are sequentially installed from front to back inside the impact area, and adjacent impact plates and the impact plates themselves are separated from the inner wall of the impact area by the support column 33. The first and third impact plates are corrugated plates, such as... Figure 12 As shown, the second impact plate has evenly distributed circular concave regions 34 on both sides, with an arc-shaped transition between adjacent concave regions 34; as Figure 13 As shown, the corrugations and concave regions 34 on the first, second, and third impact plates are misaligned.

[0044] This invention utilizes a three-layer impact plate design to increase the penetration resistance of the rear seat 3 when it is impacted, thus better protecting the occupants of the rear seat 3. In this invention, both the first and third impact plates are corrugated plates. The function of the corrugated plates is to guide the rod-shaped impactor, changing its insertion direction from vertical (front-to-back) to oblique (left-to-right) under the guidance of the corrugations. Furthermore, under the guidance of the corrugated plates, the obliquely inserted rod-shaped impactor slides along the length of the grooves on the corrugated plates to the left and right sides, thus buffering and changing the direction of the impact force. The various second impact plates of the present invention have uniformly distributed circular concave regions 34 on both sides, with an arc transition between adjacent concave regions 34; the corrugations and concave regions 34 on the first, second, and third impact plates are staggered; this design ensures that the rod-shaped impact object inserted from the third impact plate is guided by the concave region 34 on the second impact plate and inserted from the innermost recess of the concave region 34, while the concave region 34 is directly opposite the corrugated inclined surface of the first impact plate. In this way, the rod-shaped impact object inserted from the second impact plate will slide obliquely along the corrugated groove of the first impact plate under the corrugated inclined surface, that is, the rod-shaped impact object is guided obliquely again, preventing the rod-shaped impact object from causing vertical insertion injury to the person. At the same time, the two oblique guidance will cause the third anti-impact plate 32 and the second anti-impact plate 31 to deform, which also plays a buffering role.

[0045] like Figure 4 As shown, the first limiting mechanism 8 includes a first rack 9, a second rack 10, a first gear 11, and a first spring 12. The first rack 9 is laterally slidably installed in the rear seat base 6, and the first spring 12 is installed between the first rack 9 and the rear seat base 6. The first gear 11 is rotatably installed in the rear seat base 6 and meshes with the first rack 9. The second rack 10 is vertically slidably installed in the rear seat base 6 and cooperates with a corresponding fixed lug 15. The fixed lug 15 has a limiting groove that cooperates with the second rack 10. The second rack 10 meshes with the first gear 11.

[0046] The function of the first spring 12 is to reset the first rack 9. When the first rack 9 slides, it will drive the first gear 11 to rotate. The rotation of the first gear 11 will drive the second rack 10 to slide, thereby controlling whether the second rack 10 limits the fixed lug 15.

[0047] like Figure 7 , 8As shown, the second limiting mechanism 16 includes a third rack 17, a second gear 18, a second spring 19, and a fourth rack 20. The fourth rack 20 is laterally slidably installed within the bottom elastic pad 14 of the rear seat backrest 13, and the second spring 19 is installed between the fourth rack 20 and the bottom elastic pad 14. The second gear 18 is rotatably installed within the bottom elastic pad 14 of the rear seat backrest 13, and meshes with the fourth rack 20. The third rack 17 is vertically slidably installed within the bottom elastic pad 14 of the rear seat backrest 13, and engages with a corresponding fixed lug 15. The fixed lug 15 has a limiting groove that engages with the third rack 17. The third rack 17 meshes with the second gear 18. The second spring 19 functions to reset the fourth rack 20. When the fourth rack 20 slides, it drives the second gear 18 to rotate, which in turn drives the third rack 17 to slide, thereby controlling whether the third rack 17 limits the rear seat backrest 13.

[0048] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

[0049] Implementation method: When using the seat designed according to this invention, the original rear seat is removed, and the three mounting lugs 7 are fixed to the mounting position of the rear seat by welding or bolting. The rear seat base 6 is locked to the mounting position of the rear seat by a locking structure; the locking structure for locking the rear seat base 6 to the mounting position is existing technology. Regarding... Figure 11 As shown in Figure a, the installation arrangement involves installing three mounting lugs 7 on the lower side of the front end of the mounting step, and the rear seat base 6 on the mounting step; for example, Figure 11 As shown in b, the installation arrangement involves installing three mounting lugs 7 on the lower side of the front end of the rear seat mounting position, and mounting the rear seat base 6 on the mounting platform.

[0050] When using the seat designed according to this invention, when the rear seat 3 is folded down, for example... Figure 11 As shown in diagram 'a', when the rear seat is folded down, the second limiting mechanism 16 releases its restriction on the rear seat backrest 13, allowing the rear seat backrest 13 to be folded 90 degrees relative to the rear seat base 6. This method is similar to... Figure 11 The rear seats of the existing cars shown in Figure 'a' fold down in the same way. For example... Figure 11As shown in b, when the rear seat is folded down, firstly, the limiting plate 24 releases its restriction on the upper and lower parts of the rear seat back 13, controlling the upper and lower parts of the rear seat back 13 to fold 180 degrees. After the rear seat back 13 is folded down, the second limiting mechanism 16 releases its restriction on the rear seat back 13, folding the rear seat back 13 90 degrees relative to the rear seat base 6. The front seat 2 is then adjusted forward. Next, the first limiting mechanism 8 releases its restriction on the fixed bracket 15, controlling the rear seat 3 to swing forward relative to the mounting bracket 7, while simultaneously controlling the mounting bracket 7 to slide forward; so that the upper part of the swung rear seat 3 is flush with the bottom of the trunk. Then, the rear seat 3 is pushed so that the middle elastic area 27 is inserted into the groove opened on the lower side of the rear seat body 1. At this point, the rear seat 3 adjustment is complete. Figure 11 As shown in c, at this time, the rear seat 3 is at the bottom with the top elastic pad tightly against the bottom surface of the front side passage of the rear seat, and the adjusted rear seat 3 is relatively stable.

[0051] When removing the rear seat, simply remove the mounting bracket 7.

Claims

1. A rear seat of a car that can be converted to lie flat, characterized in that: It includes connecting lugs, a rear seat base, mounting lugs, a first limiting mechanism, a rear seat backrest, and a second limiting mechanism. Three mounting lugs are welded to the vehicle body under the rear seat. Each of the three mounting lugs has a connecting lug hinged to it. The rear seat base is mounted on the three connecting lugs, and the three connecting lugs are hinged to the rear seat base. Three fixed lugs are slidably mounted on the upper rear surface of the rear seat base. The first limiting mechanism is installed between the two fixed lugs near the sides and the rear seat base. The rear seat backrest is sway-mounted on the three fixed lugs. Two second limiting mechanisms are installed between the rear seat backrest and the two fixed lugs on the sides. The rear seat backrest includes a top impact-resistant area, a limiting plate, a bottom impact-resistant area, a top elastic pad, an impact-resistant component, and a bottom elastic pad. The bottom elastic pad is hinged to three fixed lugs, and the bottom impact-resistant area is fixedly installed on the rear side of the bottom elastic pad. The top elastic pad is installed on the upper side of the bottom elastic pad, and the top impact-resistant area is fixedly installed on the rear side of the top elastic pad. A limiting plate is installed on the rear side of the top impact-resistant area, limiting the movement of the top and bottom impact-resistant areas. An impact-resistant component is installed in both the top and bottom impact-resistant areas. The top and bottom impact-resistant areas are connected by a hinge. The impact-resistant assembly includes a first impact-resistant plate, a second impact-resistant plate, a third impact-resistant plate, and a support column. The first impact plate, the second impact plate, and the third impact plate are installed sequentially from front to back inside the impact area. Adjacent impact plates and the impact plates and the inner wall of the impact area are separated from each other by the support column. The first impact plate and the third impact plate are corrugated plates. The second impact plate has evenly distributed circular concave areas on both sides, and adjacent concave areas are connected by an arc transition.

2. The rear seat of a car that can be converted to lie flat according to claim 1, characterized in that: The top elastic pad is composed of a middle elastic pad and two top elastic side pads symmetrically distributed on both sides of the middle elastic pad; the two top elastic side pads are fixedly connected to the top impact protection area, and the middle elastic pad is fixedly connected to the bottom elastic pad.

3. A car rear seat that can be converted to lie flat according to claim 1, characterized in that: Two guide rods are slidably installed on the rear side of the top impact protection area, and a limiting plate is fixedly installed on the two guide rods. A threaded rod is rotatably installed on the rear side of the top impact protection area. The threaded rod is threadedly connected to the top impact protection area, and the lower end of the threaded rod is connected to the limiting plate through a rotating component.

4. A car rear seat that can be converted to lie flat according to claim 1, characterized in that: The corrugations of the first and third impact plates and the concave region of the second impact plate are misaligned.

5. A car rear seat that can be converted to lie flat according to claim 1, characterized in that: The first limiting mechanism includes a first rack, a second rack, a first gear, and a first spring. The first rack is laterally slidably installed in the rear seat base, and the first spring is installed between the first rack and the rear seat base. The first gear is rotatably installed in the rear seat base and meshes with the first rack. The second rack is vertically slidably installed in the rear seat base and engages with a corresponding fixed lug. The fixed lug has a limiting groove that engages with the second rack. The second rack meshes with the first gear.

6. A car rear seat that can be converted to lie flat according to claim 1, characterized in that: The second limiting mechanism includes a third rack, a second gear, a second spring, and a fourth rack. The fourth rack is laterally slidably installed in the bottom elastic pad of the rear seat backrest, and the second spring is installed between the fourth rack and the bottom elastic pad. The second gear is rotatably installed in the bottom elastic pad of the rear seat backrest and meshes with the fourth rack. The third rack is vertically slidably installed in the bottom elastic pad of the rear seat backrest and engages with a corresponding fixed lug. The fixed lug has a limiting groove that engages with the third rack. The third rack meshes with the second gear.

Images