A car seat that can be used as a bed

Abstract

This utility model discloses a car seat that can be used as a bed, including a base, on which a seat frame assembly is disposed. The seat frame assembly can be rotated forward to a horizontal position with its front end as the pivot point. A backrest assembly is installed at the rear end of the base, and the backrest assembly can be reclined forward to a horizontal position. The backrest assembly includes a front backrest and a rear backrest. When the backrest assembly is reclined forward to a horizontal position, the rear backrest can be rotated backward relative to the front backrest to a horizontal position. The beneficial effect of this utility model is that it can easily realize the conversion of the seat from a sitting position to a reclining position.

Description

Technical Field

[0001] This utility model relates to the field of automotive seat technology, specifically to an automotive seat that can be used as a bed. Background Technology

[0002] In recent years, with the rise of outdoor camping, consumers have placed higher demands on the rest functions of large SUVs. Major automakers have launched large bed rest modes to meet user needs, but existing seat-to-bed technology still has significant shortcomings.

[0003] Currently, mainstream seat-to-bed solutions fall into two main categories: one involves folding down the backrests of the second and third rows of seats to create a flat surface with the trunk floor; the other involves adjusting the first and second rows of seats to achieve a bed function. However, these solutions have revealed several problems in practical applications: First, converting multiple rows of seats into a bed requires adjusting several components, such as backrest angles and fore-and-aft movement, step by step. Some models use manual or electric step-by-step adjustments, making the process cumbersome. Second, in actual use, the folding process requires considerable force, making it difficult for a single person to operate. Some users cannot independently convert the seats into a bed, and the multi-row seat structure has poor adaptability to the interior space, making it difficult to meet diverse usage scenarios. Utility Model Content

[0004] In view of this, the present invention provides a car seat that can be used as a bed, and can independently transform the seat into a bed.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] A car seat that can be used as a bed is characterized by comprising a base on which a seat frame assembly is mounted, the seat frame assembly being able to rotate forward to a horizontal position with its front end as a pivot point; and a backrest assembly being mounted at the rear end of the base, the backrest assembly being able to recline forward to a horizontal position.

[0007] The backrest assembly includes a front backrest and a rear backrest. When the backrest assembly is laid down to a horizontal position, the rear backrest can be flipped backward relative to the front backrest to a horizontal position.

[0008] With the above structure, when the user needs to change the seat from a sitting position to a reclining position, the seat frame assembly flips forward to a horizontal position, the front backrest flips forward to align with the rear end of the seat frame assembly, and the rear backrest flips backward relative to the front backrest to a horizontal position. At this time, the seat frame assembly, the front backrest, and the rear backrest form a continuous and flat support surface, thereby easily converting the seat into a bed with reclining function.

[0009] Preferably, a front connecting rod and a rear connecting rod are provided between the seat frame assembly and the base. The upper and lower ends of the front connecting rod are rotatably connected to the front end of the seat frame assembly and the base, respectively. The upper and lower ends of the rear connecting rod are connected to the rear end of the seat frame assembly and the base, respectively. A locking assembly is provided at the connection position between the seat frame assembly and the rear connecting rod. The locking assembly is used to maintain and release the connection between the seat frame assembly and the upper end of the rear connecting rod.

[0010] A first electric angle adjuster is provided between the upper end of the front link and the seat frame assembly, which drives the seat frame assembly to rotate back and forth around the upper end of the front link. A second electric angle adjuster is provided between the lower end of the front link and the base, which drives the lower end of the front link to rotate back and forth around the base. With this structure, the seat frame assembly and the rear link maintain a stable connection when the seat is in a seated position, ensuring the stability and load-bearing capacity of the seat frame assembly. When the seat is transformed into a bed, the locking assembly releases the connection between the seat frame assembly and the rear link. The second electric angle adjuster drives the lower end of the front link to rotate forward around the base, moving the seat frame assembly forward. At the same time, the first electric angle adjuster drives the seat frame assembly to rotate forward around the upper end of the front link to a horizontal position.

[0011] Preferably, a cable assembly is provided between the rear link and the front backrest. When the backrest assembly rotates forward, the cable assembly pulls the rear link forward relative to the base. A reset assembly is provided between the rear link and the base. When the backrest assembly flips backward to a sitting position, the reset assembly returns the rear link to its initial position. With this structure, when the seat transforms into a bed, the backrest assembly rotates forward, and the cable assembly pulls the rear link forward relative to the base. When the seat changes from a reclining position to a sitting position, the backrest assembly flips backward to a sitting position, and the reset assembly returns the rear link to its initial position. This ensures that when the seat frame assembly returns to the sitting position, the locking assembly can precisely engage with the rear link and lock, preventing the rear link from affecting the normal use of the seat due to positional deviation.

[0012] Preferably, the cable assembly includes a cable, a bracket fixed to the side of the front backrest, and a guide ring fixed to the side of the base. The lower part of the rear connecting rod has a downwardly extending protrusion. One end of the cable is connected to the protrusion, and the other end is connected to the bracket. The middle of the cable slides through the guide ring, and the connection point between the cable and the bracket is offset from the rotation center line of the backrest assembly. With this structure, when the front backrest rotates forward, the cable effectively drives the rear connecting rod to rotate forward. The guide ring limits and guides the cable, ensuring a stable trajectory during pulling.

[0013] Preferably, the reset assembly includes an elastic element disposed between the rear link and the base, and a limiting protrusion fixed on the base. In the seated position, the elastic element drives the rear link against the limiting protrusion. With this structure, when the seat changes from a reclining position to a seated position, during the process of the front backrest flipping backward to an inclined seated position, the rear link precisely returns to its original position under the elastic force of the elastic element and abuts against the limiting protrusion. The limiting protrusion provides precise positioning for the reset of the rear link, ensuring that the rear link can return to its initial position so that the locking assembly on the seat frame assembly can precisely engage with the rear link.

[0014] Preferably, the front link includes a lower connecting plate and an upper connecting plate fixedly connected as one unit. The lower connecting plate is rotatably connected to the base via a second electric angle adjuster, and the upper connecting plate is rotatably connected to the seat frame assembly via a first electric angle adjuster. The upper and lower connecting plates overlap and are connected at the middle section. This structure enhances the overall structural strength and rigidity of the front link, enabling it to transmit force more stably and improving the support reliability of the seat frame assembly during tilting.

[0015] Preferably, a third electric angle adjuster is provided between the lower part of the front backrest and the base, which drives the front backrest to rotate back and forth around the base. With this structure, the front backrest can automatically tilt forward and flatten.

[0016] Preferably, a flip-up drive module is provided between the front backrest and the rear backrest, the flip-up drive module being used to drive the rear backrest to flip backward relative to the front backrest. With this structure, the rear backrest can automatically flip backward relative to the front backrest to a horizontal position.

[0017] Preferably, the flipping drive module includes a drive assembly, a central gear fixedly mounted on the rear end of the front backrest, and a planetary gear disposed on the rear end of the rear backrest. The drive assembly drives the planetary gear to rotate circumferentially around the central gear. With this structure, the planetary gear and the central gear remain meshed, and the drive assembly drives the planetary gear to rotate circumferentially around the central gear, thereby causing the rear backrest to flip backward to a horizontal position around the rear end of the front backrest. Furthermore, the upper side of the flipped rear backrest is flush with the upper side of the front backrest, ensuring the flatness of the rear backrest and front backrest surfaces after the rear backrest is unfolded.

[0018] Preferably, the central gear is an arc-shaped tooth block. This structure satisfies the meshing stroke required for the revolving gear to rotate around the central gear to a horizontal position, ensuring the continuity and stability of gear transmission during the backrest flipping process. It also reduces tooth machining in non-meshing areas, simplifies the structure of the central gear, and lowers manufacturing costs.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] 1. The car seat provided by this utility model, which can be used as a bed, transforms from a sitting position to a lying position. The seat frame assembly flips forward to a horizontal position, the front backrest flips forward to align with the rear end of the seat frame assembly, and the rear backrest flips backward relative to the front backrest to a horizontal position. At this time, the seat frame assembly, the front backrest, and the rear backrest form a continuous and flat support surface, thereby conveniently converting the seat into a bed with reclining function and effectively expanding the usage scenarios of the seat.

[0021] 2. The structural design, featuring a rotatable connection between the seat frame assembly and the base, a rotatable connection between the front backrest and the base, and a rear backrest that can flip backward relative to the front backrest, allows for easy conversion from a sitting to a reclining position, whether manually or electrically folded. Furthermore, the overlapping arrangement of the front and rear backrests helps maintain the compactness of the seat structure in the sitting position while ensuring the deformability function, thus meeting users' needs for multifunctionality and efficient space utilization.

[0022] 3. By setting a first electric angle adjuster between the upper end of the front link and the seat frame assembly, and a second electric angle adjuster between the lower end of the front link and the base, the dual angle adjuster can precisely control the rotation angle and posture of the seat frame assembly relative to the base, making the rotation of the seat frame assembly from a sitting position to a lying position more stable, controllable and efficient, and improving the accuracy and smoothness of seat deformation.

[0023] 4. The front link adopts a segmented structure with overlapping middle sections, which enhances the overall structural strength and rigidity of the front link, enabling it to transmit force more stably and improving the support reliability of the seat frame assembly during the flipping process.

[0024] 5. The car seat that can be used as a bed provided by this utility model has a simple and reliable structural design of the reset component, which reduces manufacturing costs while ensuring the realization of functions, and improves the smoothness of seat state transition and durability.

[0025] 6. The car seat that can be used as a bed, provided by this utility model, has the advantage of high reliability because the cable and elastic element work together to eliminate the installation gap of the rear linkage. Attached Figure Description

[0026] Figure 1 This is a structural diagram of the seat in a seated position.

[0027] Figure 2 This is another structural diagram of the seat in a seated position;

[0028] Figure 3This is a structural diagram of the seat in its reclining position;

[0029] Figure 4 To illustrate the structural diagram of the tilt drive module 7 in the seat;

[0030] Figure 5 This is a partially enlarged view showing the structure of the central gear 71 and the revolution gear 72;

[0031] Figure 6 To show a partial enlarged view of the connection between the lower connecting plate 11 and the base C;

[0032] Figure 7 To show a partial enlarged view of the connection between the upper connecting plate 12 and the seat frame assembly A;

[0033] Figure 8 This is a magnified view showing the specific structure of the cable assembly 5 in the seat. Detailed Implementation

[0034] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0035] like Figure 1 and Figure 3 As shown, a car seat that can be used as a bed includes a base C, a seat frame assembly A disposed on the base C, and a backrest assembly B disposed at the rear end of the seat frame assembly A. The seat frame assembly A can be rotated forward to a horizontal position with its front end as the pivot point, and the backrest assembly B can be folded forward to a horizontal position. The backrest assembly B includes a front backrest B1 and a rear backrest B2 arranged in an overlapping manner. When the backrest assembly B is folded forward to a horizontal position, the rear backrest B2 can be rotated backward to a horizontal position relative to the front backrest B1.

[0036] Using the chair provided in this embodiment, when the user needs to change the chair from a sitting position to a reclining position, the seat frame assembly A flips forward to a horizontal position, the front backrest B1 flips forward to align with the rear end of the seat frame assembly A, and the rear backrest B2 flips backward relative to the front backrest B1 to a horizontal position. At this time, the seat frame assembly A, the front backrest B1, and the rear backrest B2 form a continuous and flat support surface, thereby conveniently converting the chair into a bed with reclining function and effectively expanding the usage scenarios of the chair.

[0037] Through a structural design that allows the seat frame assembly A to be rotatably connected to the base C, the front backrest B1 to be rotatably connected to the base C, and the rear backrest B2 to be able to flip backward relative to the front backrest B1, the seat can easily be transformed from a sitting position to a reclining position, whether manually or electrically flipped. At the same time, the overlapping arrangement of the front backrest B1 and the rear backrest B2 helps maintain the compactness of the seat structure in the sitting position while ensuring the deformability function, thus meeting the user's needs for seat versatility and space utilization efficiency.

[0038] The following will provide a detailed description of the specific implementation structure for transforming a seat into a bed based on electric control technology.

[0039] Please refer to Figure 2 A front connecting rod 1 and a rear connecting rod 2 are provided between the seat frame assembly A and the base C. The upper end of the front connecting rod 1 is rotatably connected to the front end of the seat frame assembly A, and the lower end of the front connecting rod 1 is rotatably connected to the base C. The upper end of the rear connecting rod 2 is connected to the rear end of the seat frame assembly A, and the lower end of the rear connecting rod 2 is connected to the base C. A locking assembly D is provided at the connection point between the seat frame assembly A and the upper end of the rear connecting rod 2. The locking assembly D can maintain and disengage the connection between the seat frame assembly A and the upper end of the rear connecting rod 2. A first electric angle adjuster 3 is provided between the upper end of the front connecting rod 1 and the seat frame assembly A. The first electric angle adjuster 3 can drive the seat frame assembly A to rotate back and forth around the upper end of the front connecting rod 1. A second electric angle adjuster 4 is provided between the lower end of the front connecting rod 1 and the base C. The second electric angle adjuster 4 can drive the lower end of the front connecting rod 1 to rotate back and forth around the base C.

[0040] Based on this, when the seat is in a seated position, the seat frame assembly A and the rear link 2 maintain a stable connection to ensure the stability and load-bearing capacity of the seat frame assembly A. When the seat transforms into a bed, the locking assembly D releases the connection between the seat frame assembly A and the rear link 2. The second electric angle adjuster 4 drives the lower end of the front link 1 to rotate forward around the base C, causing the seat frame assembly A to move forward. At the same time, the first electric angle adjuster 3 drives the seat frame assembly A to rotate forward around the upper end of the front link 1 to a horizontal position. By controlling the forward movement and rotation of the seat frame assembly A, sufficient space can be left under the front backrest B1, avoiding interference during the seat transformation into a bed. Meanwhile, by setting a first electric angle adjuster 3 between the upper end of the front link 1 and the seat frame assembly A, and a second electric angle adjuster 4 between the lower end of the front link 1 and the base C, the dual angle adjuster can precisely control the rotation angle and posture of the seat frame assembly A relative to the base C, making the rotation of the seat frame assembly A from a sitting position to a lying position more stable, controllable and efficient, and improving the accuracy and smoothness of seat deformation.

[0041] Depend on Figure 2As can be seen, in this embodiment, the base C is provided with a support protrusion b, and when the seat is in a seated position, the front link 1 rests against the support protrusion b. The support protrusion b provides stable support for the front link 1, ensuring the reliability of the overall seat structure under load.

[0042] refer to Figure 2 , 6 In this embodiment, the front connecting rod 1 adopts a segmented structural design, consisting of an upper connecting plate 12 and a lower connecting plate 11 fixedly connected as a whole. The lower connecting plate 11 is rotatably connected to the base C via a second electric angle adjuster 4, and the upper connecting plate 12 is rotatably connected to the seat frame assembly A via a first electric angle adjuster 3. In this embodiment, the upper connecting plate 12 and the lower connecting plate 11 overlap at the middle section, and the overlapping part is fixedly connected by a fastener. This design enhances the overall structural strength and rigidity of the front connecting rod 1, enabling it to transmit force more stably and improving the support reliability of the seat frame assembly A during its flipping process.

[0043] To enhance the versatility of the seat and prevent motion interference during deformation, such as Figure 1 and Figure 2 As shown, in this embodiment, the upper and lower ends of the rear link 2 are rotatably connected to the rear end of the seat frame assembly A and the base C, respectively. The locking assembly D enables the seat frame assembly A to maintain and disengage the rotatable connection with the rear link 2. A cable assembly 5 is provided between the rear link 2 and the front backrest B1. When the seat is transformed into a bed, the backrest assembly B rotates forward, and the cable assembly 5 can pull the rear link 2 to rotate forward relative to the base C. A reset assembly is provided between the rear link 2 and the base C. When the seat changes from a reclining state to a sitting state, the backrest assembly B flips backward to the sitting state. The reset assembly enables the rear link 2 to return to its initial position, so that when the seat frame assembly A returns to the sitting state, the locking assembly D can precisely engage with the rear link 2 and lock it, preventing the rear link 2 from affecting the normal use of the seat due to positional deviation.

[0044] In this embodiment, the locking assembly D adopts a floor lock structure, the specific structure of which is described in patent document CN119283738A. Floor locks are a mature technology in the field of automotive seat technology, and will not be described in detail here.

[0045] Further reference Figure 8The cable assembly 5 includes a cable 51, a bracket 52 fixed to the side of the front backrest B1, and a guide ring 53 fixed to the side of the base C. The rear connecting rod 2 has a downwardly extending protrusion 2a at its lower part. One end of the cable 51 is connected to the protrusion 2a, and the other end is connected to the bracket 52. The middle of the cable 51 slides through the guide ring 53. In this embodiment, the connection position between the cable 51 and the bracket 52 is offset from the rotation center line of the backrest assembly B, which enhances the sensitivity and effortlessness of the linkage between the rear connecting rod 2 and the backrest assembly B. When the front backrest B1 rotates forward, the cable 51 effectively drives the rear connecting rod 2 to rotate forward. The guide ring 53 limits and guides the cable 51, ensuring the stability of the cable 51's trajectory during pulling.

[0046] like Figure 2 As shown, the reset assembly includes an elastic element disposed between the rear link 2 and the base C, and a limiting protrusion a fixed on the base C. When the seat is in a seated position, the elastic element drives the rear link 2 to abut against the limiting protrusion a. When the seat changes from a reclined to a seated position, as the front backrest B1 flips backward to a tilted seated position, the rear link 2 precisely returns to its original position under the elastic force of the elastic element and abuts against the limiting protrusion a. The limiting protrusion a provides precise positioning for the reset of the rear link 2, ensuring that the rear link 2 returns to its initial position so that the locking assembly D on the seat frame assembly A can precisely engage with the rear link 2. This structural design is simple and reliable, reducing manufacturing costs while ensuring functionality, and improving the smoothness of seat state transitions and durability.

[0047] Please refer to Figure 2 The base C has an upwardly extending support C1 fixed at its rear, and the lower part of the front backrest B1 is rotatably mounted on the support C1. The support C1 provides stable support for the rotation of the front backrest B1, and has the technical advantages of safe and reliable flipping of the front backrest B1 and convenient assembly.

[0048] Revisit Figure 1 A third electric angle adjuster 6 is provided between the lower part of the front backrest B1 and the support C1. The third electric angle adjuster 6 can drive the front backrest B1 to rotate back and forth around the support C1 so as to make the front backrest B1 tilt forward and flat.

[0049] In this embodiment, the front link 1, the rear link 2, the latch assembly D, the cable assembly 5, the reset assembly, the support C1, and the support protrusion b are each provided in two sets, located on the left and right sides of the seat respectively, and corresponding one to one. The two sets of front links 1 are located at the front ends of the two sides of the seat frame assembly A, and the two sets of rear links 2 are located at the rear ends of the two sides of the seat frame assembly A respectively. The support C1 is located on both sides of the lower part of the front backrest B1.

[0050] Reference Figure 2 and 3A flip drive module 7 is provided between the front backrest B1 and the rear backrest B2. The flip drive module 7 can drive the rear backrest B2 to flip backward relative to the front backrest B1. When the seat is transformed into a bed, the rear backrest B2 can automatically flip backward relative to the front backrest B1 to a horizontal state.

[0051] Specifically, such as Figure 4 As shown, the flipping drive module 7 includes a drive assembly, a central gear 71 fixedly mounted at the rear end of the front backrest B1, and a planetary gear 72 disposed at the rear end of the rear backrest B2. Here, "rear end" refers to the orientation of the front backrest B1 and the rear backrest B2 in their forward-folded-flat state. The planetary gear 72 is engaged with the central gear 71, and the drive assembly can drive the planetary gear 72 to rotate circumferentially around the central gear 71, thereby causing the rear backrest B2 to flip backward around the rear end of the front backrest B1 to a horizontal state. Furthermore, the upper side of the flipped rear backrest B2 is flush with the upper side of the front backrest B1, ensuring the flatness of the surfaces of the rear backrest B2 and the front backrest B1 after the rear backrest B2 is unfolded. This structure utilizes the characteristics of gear meshing to ensure the accuracy of the flipping angle of the rear backrest B2, enabling the rear backrest B2 to flip smoothly and precisely to a horizontal state.

[0052] Furthermore, in combination Figure 3 and Figure 4 As shown, the drive assembly includes a driver 74 and a retainer 73 rotatably connected between the rear ends of the front backrest B1 and the rear backrest B2. The two ends of the retainer 73 are respectively rotatably sleeved at the axial positions of the planetary gear 72 and the central gear 71. The driver 74 is used to drive the retainer 73 to rotate around its rotation center with respect to the front backrest B1, thereby driving the planetary gear 72 to rotate circumferentially around the central gear 71, thus enabling the rear backrest B2 to flip backward relative to the front backrest B1 to a horizontal state.

[0053] In this embodiment, there are two sets of central gear 71, planetary gear 72 and retainer 73, which correspond one to one. In the seated position, the two sets of central gear 71 are fixed on both sides of the lower end of the front backrest B1, and the two sets of planetary gear 72 are rotatably set on both sides of the lower end of the rear backrest B2.

[0054] Depend on Figure 5As can be seen, in this embodiment, the central gear 71 is an arc-shaped tooth block. This design not only satisfies the meshing stroke required for the revolving gear 72 to rotate around the central gear 71 to a horizontal state, ensuring the continuity and stability of gear transmission during the flipping of the rear backrest B2, but also reduces tooth machining in non-meshing areas, simplifying the structure of the central gear 71 and reducing manufacturing costs. Simultaneously, the arc-shaped tooth layout matches the flipping trajectory of the rear backrest B2, avoiding space occupation and structural interference caused by excess teeth, making the connection between the front backrest B1 and the rear backrest B2 more compact. While ensuring the precise flipping of the rear backrest B2 to a horizontal state, it optimizes the space utilization inside the seat, improving the overall structural rationality and economy.

[0055] In this embodiment, the first electric angle adjuster 3, the second electric angle adjuster 4, the third electric angle adjuster 6 and the driver 74 are all mature electric adjustment mechanisms in the field of vehicle seats. They can realize the angle adjustment and locking of seat components under the drive of motor. The specific composition and working principle of these structures are common knowledge to those skilled in the art and will not be described again here.

[0056] Finally, it should be noted that the above description is merely a preferred embodiment of the present utility model. Those skilled in the art, under the guidance of the present utility model, can make various similar representations without departing from the spirit and claims of the present utility model, and such modifications all fall within the protection scope of the present utility model.

Claims

1. A car seat that can be used as a bed, characterized in that, Includes a base (C), on which a seat frame assembly (A) is provided, the seat frame assembly (A) being able to rotate forward to a horizontal state with the front end as the pivot point; a backrest assembly (B) is installed at the rear end of the base (C), the backrest assembly (B) being able to be folded forward to a horizontal state. The backrest assembly (B) includes a front backrest (B1) and a rear backrest (B2). When the backrest assembly (B) is laid down in a horizontal position, the rear backrest (B2) can be flipped backward relative to the front backrest (B1) to a horizontal position.

2. The car seat capable of being used as a bed according to claim 1, characterized in that: A front connecting rod (1) and a rear connecting rod (2) are provided between the seat frame assembly (A) and the base (C). The upper and lower ends of the front connecting rod (1) are rotatably connected to the front end of the seat frame assembly (A) and the base (C) respectively. The upper and lower ends of the rear connecting rod (2) are connected to the rear end of the seat frame assembly (A) and the base (C) respectively. A locking assembly (D) is provided at the connection position between the seat frame assembly (A) and the rear connecting rod (2). The locking assembly (D) is used to maintain and release the connection between the upper end of the seat frame assembly (A) and the rear connecting rod (2). A first electric angle adjuster (3) is provided between the upper end of the front link (1) and the seat frame assembly (A), and the first electric angle adjuster (3) is used to drive the seat frame assembly (A) to rotate back and forth around the upper end of the front link (1); a second electric angle adjuster (4) is provided between the lower end of the front link (1) and the base (C), and the second electric angle adjuster (4) is used to drive the lower end of the front link (1) to rotate back and forth around the base (C).

3. The car seat capable of being used as a bed according to claim 2, characterized in that: A cable assembly (5) is provided between the rear link (2) and the front backrest (B1). When the backrest assembly (B) rotates forward, the cable assembly (5) is used to pull the rear link (2) to rotate forward relative to the base (C). A reset assembly is provided between the rear link (2) and the base (C). When the backrest assembly (B) is flipped backward to a sitting position, the reset assembly is used to return the rear link (2) to its initial position.

4. The car seat capable of being used as a bed according to claim 3, characterized in that: The cable assembly (5) includes a cable (51), a bracket (52) fixed to the side of the front backrest (B1), and a guide ring (53) fixed to the side of the base (C). The lower part of the rear connecting rod (2) is provided with a downwardly extending protrusion (2a). One end of the cable (51) is connected to the protrusion (2a), and the other end is connected to the bracket (52). The middle part of the cable (51) slides through the guide ring (53). The position where the cable (51) is connected to the bracket (52) is offset from the rotation center line of the backrest assembly (B).

5. The car seat capable of being used as a bed according to claim 3, characterized in that: The reset assembly includes an elastic element disposed between the rear link (2) and the base (C) and a limiting protrusion (a) fixed on the base (C). In the seated position, the elastic element drives the rear link (2) to abut against the limiting protrusion (a).

6. The car seat capable of being used as a bed according to claim 2, characterized in that: The front connecting rod (1) includes a lower connecting plate (11) and an upper connecting plate (12) that are fixedly connected as one piece. The lower connecting plate (11) is connected to the base (C) through a second electric angle adjuster (4), and the upper connecting plate (12) is connected to the seat frame assembly (A) through a first electric angle adjuster (3). The upper connecting plate (12) and the lower connecting plate (11) are connected in an overlapping manner at the middle section.

7. The car seat capable of being used as a bed according to claim 1, characterized in that: A third electric angle adjuster (6) is provided between the lower part of the front backrest (B1) and the base (C). The third electric angle adjuster (6) is used to drive the front backrest (B1) to rotate back and forth around the base (C).

8. The car seat capable of being used as a bed according to claim 1, characterized in that: A flip drive module (7) is provided between the front backrest (B1) and the rear backrest (B2), and the flip drive module (7) is used to drive the rear backrest (B2) to flip backward relative to the front backrest (B1).

9. The car seat capable of being used as a bed according to claim 8, characterized in that: The flip drive module (7) includes a drive assembly, a central gear (71) fixedly installed at the rear end of the front backrest (B1), and a planetary gear (72) disposed at the rear end of the rear backrest (B2). The drive assembly is used to drive the planetary gear (72) to rotate circumferentially around the central gear (71).

10. The car seat capable of being used as a bed according to claim 9, characterized in that: The central gear (71) is an arc-shaped tooth block.

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