Automobile seat with back-row seat putting-down mechanism and supporting method of automobile seat

Abstract

The invention relates to an automobile seat with a rear-row seat putting-down mechanism and a supporting method thereof.The automobile seat comprises an extending backrest framework arranged on a seat backrest framework in a folded mode, a foot margin supporting mechanism arranged below the extending backrest framework and / or the seat backrest framework and a cushion lifting mechanism; the top of the seat backrest framework is rotationally connected with the extending backrest framework, the bottom of the seat backrest framework is rotationally connected to the cushion framework assembly through an angle adjuster, and an angle adjuster lower connecting plate is installed at the position, close to the angle adjuster, of the bottom of the seat backrest framework. The angle adjuster lower connecting plate is connected with the cushion lifting mechanism and drives the cushion to lift; the backrest has the advantages that the backrest framework is unfolded backwards, and the upper surface of the unfolded backrest framework is coated with the skin, so that the comfort is higher, and an air cushion bed can be omitted.

Description

Technical Field

[0001] The invention relates to the technical field of automobile rear seats, and in particular to an automobile seat with a rear seat folding mechanism and a supporting method thereof. Background Art

[0002] Today, drivers have higher and higher requirements for vehicle space and riding experience. With the rapid development of the economy and the faster pace of life in cities, people want to relax and take a trip at any time, which has also given rise to the rise of the tourism economy. In order to meet the travel needs of drivers, many car companies have launched the rear seat folding function, but the rear seats of some models are uneven and lack support after folding. After the seats are folded, they need to be equipped with inflatable cushions to ensure comfort. Summary of the invention

[0003] In view of the above problems, the purpose of the present invention is to provide a car seat with a rear seat folding mechanism and a supporting method thereof, which is used to unfold the backrest frame backward. After unfolding, the upper surface is covered with leather. After the seat is folded down, it has better supporting ability and more excellent lying experience, so as to overcome the shortcomings of the above-mentioned prior art.

[0004] The present invention provides a car seat with a rear seat folding mechanism, comprising: an extended backrest frame folded on a seat backrest frame, a ground support mechanism arranged under the extended backrest frame and / or the seat backrest frame, and a seat cushion lifting mechanism, wherein the top of the seat backrest frame is rotatably connected to the extended backrest frame, the bottom of the seat backrest frame is rotatably connected to the seat cushion frame assembly through a recliner, a recliner lower connecting plate is installed at the bottom of the seat backrest frame near the recliner, and the recliner lower connecting plate is connected to the seat cushion lifting mechanism and drives the seat cushion to rise and fall;

[0005] The seat cushion lifting mechanism is used to automatically adjust the seat cushion frame to be flush with the seat back frame after folding down, and the foot support mechanism is used to automatically unfold and support the seat back frame after folding down and / or the extended back frame after unfolding;

[0006] An extension backrest lock and an extension backrest recovery strap are provided between the extension backrest frame and the seat backrest frame, the extension backrest lock is used to lock the free end of the extension backrest frame on the seat backrest frame, and the extension backrest recovery strap is used to pull the extension backrest frame to be folded to a folded state;

[0007] An extension backrest coil spring is mounted on the hinge shaft connecting the seat backrest frame and the extension backrest frame, and the extension backrest coil spring is used to assist the extension backrest frame in unfolding;

[0008] The seat back frame is connected to the recliner shaft, and a supporting backrest coil spring (a structure for manually adjusting the recliner) is mounted on the recliner shaft, or an angle adjustment drive motor (a structure for electrically adjusting the recliner) is provided for driving the recliner shaft to rotate. The supporting backrest coil spring and the angle adjustment drive motor are used to lift the seat back frame to its initial position after being folded down.

[0009] As a preferred embodiment of the present invention, the ground support mechanism includes: an active support arm, a first driven support arm, a second driven support arm, a third driven support arm, an intermediate support leg, and a rear support leg, the intermediate support leg is hinged at a position near the top of the seat back frame, the rear support leg is hinged at the bottom of the extended back frame, one end of the active support arm is hinged on the rear support leg, and the other end is hinged on the first driven support arm, one end of the first driven support arm is hinged at the bottom of the extended back frame, and the other end is hinged to one end of the second driven support arm, the other end of the second driven support arm is hinged to one end of the third driven support arm, and the other end of the third driven support arm is hinged to the intermediate support leg, and the extended back frame and the seat back frame drive the active support arm during the unfolding process, the active support arm drives the rear support leg to unfold and stand upright and drives the first driven support arm, the first driven support arm drives the second driven support arm, the second driven support arm drives the third driven support arm, and the third driven support arm drives the intermediate leg to unfold and stand upright.

[0010] The seat cushion lifting mechanism comprises: a movable seat cushion frame, a rear end of the movable seat cushion frame being hinged on the seat cushion adjustment shaft on the lower connecting plate of the recliner, a front end of the movable seat cushion frame being fixedly connected with a sliding shaft, a strip sliding hole is provided on the seat cushion fixing seat below the movable seat cushion frame, the sliding shaft of the movable seat cushion frame is slidably connected in the strip sliding hole of the seat cushion fixing seat, and the seat back frame drives the lower end of the lower connecting plate of the recliner to rotate forward around the recliner rotating shaft when the seat back frame is folded backward, and the seat cushion adjustment shaft on the lower connecting plate of the recliner drives the rear end of the movable seat cushion frame to be lifted upward and flush with the seat back frame after being folded down, and at the same time, the front end of the movable seat cushion frame moves forward on the seat cushion fixing seat through the sliding shaft, so that the movable seat cushion frame is flush with the seat back frame after being folded down.

[0011] The movable seat cushion frame is connected to the seat cushion adjustment shaft on the lower connecting plate of the recliner through the strip sliding hole, and the front end of the movable seat cushion frame is connected to the seat cushion adjustment shaft on the lower connecting plate of the recliner through the strip sliding hole. The seat cushion fixing seat below the movable seat cushion frame is fixedly connected with a front end hinge shaft, and the movable seat cushion frame is hinged to the front end hinge shaft on the seat cushion fixing seat through the hinge shaft connecting hole. During the process of the seat back frame being folded backward, the lower end of the lower connecting plate of the recliner is driven to rotate forward around the recliner rotating shaft, and the seat cushion adjustment shaft on the lower connecting plate of the recliner drives the rear end of the movable seat cushion frame to be lifted upward and flush with the seat back frame after being folded down. At the same time, the front end of the movable seat cushion frame is rotated upward on the seat cushion fixing seat through the front end hinge shaft, so that the movable seat cushion frame is flush with the seat back frame after being folded down.

[0012] As a preferred embodiment of the present invention, the lock tongue of the extended backrest lock is installed in the middle position of the lower end of the seat backrest frame, and a lock hole is opened in the lower part of the extended backrest frame corresponding to the position of the lock tongue. The unlocking pull strap of the extended backrest lock drives the lock tongue and the lock hole to unlock, and the pull rope end of the unlocking pull strap is arranged near the unlocking handle of the recliner.

[0013] As a preferred embodiment of the present invention, one end of the extended backrest recovery strap passes through the strip avoidance hole on the side of the seat back frame, and the other end of the extended backrest recovery strap passes through the strip avoidance hole opened on the side of the extended backrest frame. The two ends of the extended backrest recovery strap are pulled to manually fold the extended backrest frame onto the back of the seat back frame.

[0014] Another object of the present invention is to provide a method for supporting a vehicle seat with a rear seat folding mechanism, comprising the following steps:

[0015] Step S1: when the seat back frame is folded down, the recliner is unlocked and the unlocking strap is pulled, so that the seat back frame is unlocked and the extension back lock is opened through the unlocking strap, and the seat back frame is folded down backward. At this time, the extension back frame is rebounded backward under the elastic force of the extension back coil spring, and the extension back frame is automatically opened with the assistance of the elastic force of the extension back coil spring and the weight of the extension back frame itself;

[0016] Step S2: During the unfolding process of the extended backrest frame, the ground support mechanism automatically opens and supports the bottom plate of the car trunk, wherein when the seat back frame is opened, the active support arm drives the first driven support arm, the second driven support arm and the third driven support arm to open in linkage, the third driven support arm pulls the middle support leg to an upright state, and the active support arm pulls the rear support leg to an upright state;

[0017] Step S3: When the seat back frame is folded backward, the lower end of the lower connecting plate of the recliner is driven to rotate forward around the recliner rotating shaft. The cushion adjustment rotating shaft on the lower connecting plate of the recliner drives the rear end of the movable seat cushion frame to be lifted upward and flush with the folded seat back frame. At the same time, the front end of the movable seat cushion frame moves forward on the seat cushion fixing seat through the sliding rotating shaft, so that the movable seat cushion frame is flush with the folded seat back frame.

[0018] Step S4: When the seat back frame is retracted, the unlocking strap is pulled, and the seat back frame is automatically lifted up under the elastic force of the supporting backrest coil spring, and the extended backrest frame is folded inward. At the same time, the extended backrest recovery strap is pulled to complete the folding of the extended backrest frame to the initial position and lock it with the extended backrest lock. At the same time, the ground support mechanism will automatically retract the middle leg and the rear leg into the seat back frame. During the upward lifting process of the seat back frame, the cushion adjustment shaft on the lower connecting plate of the recliner will drive the movable cushion frame downward to retract and adjust it to the initial position of the member's sitting posture.

[0019] The beneficial effects of the present invention are as follows:

[0020] 1. The present invention aims to solve the problem that in the prior art, the seat is folded forward with the upper surface being a felt backboard, which makes the lying experience too hard and requires the use of an air bed. The backrest frame is unfolded backward and the upper surface is covered with leather after unfolding, so the comfort is higher and the use of the air bed can be eliminated.

[0021] 2. The present invention adds a foldable extended backrest frame to cooperate with the seat backrest frame to tilt backward. The double-layer foldable backrest design allows the front and rear seats to be directly connected to form a bed after being laid flat. Double unlocking is performed through manual control, and the automatically opened multi-link mechanism acts as a supporting mechanism to provide support and enhance stability.

[0022] 3. The unlocking process of the seat back frame, the extended back frame and the ground support mechanism of the present invention does not require the occupants to leave their seats, nor do they need to adjust their postures too much, thereby improving the portability of the rear seat folding mechanism.

[0023] 4. The present invention aims to solve the problem that after the seat back frame is folded down, the seat cushion cannot be flush with the folded seat back frame, thereby affecting the comfort of lying down. By adding a seat cushion lifting mechanism, the seat cushion frame is automatically adjusted to a position flush with the folded seat back frame, thereby improving the lying down experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] By referring to the following description in conjunction with the accompanying drawings, and with a more comprehensive understanding of the present invention, other objects and results of the present invention will become more clear and easy to understand. In the accompanying drawings:

[0025] Figure 1It is a schematic diagram of the overall structure of the extended backrest frame of this embodiment 1 in the folded state.

[0026] Figure 2 This is one of the overall structural schematic diagrams of the unfolding process of the extended backrest frame of this embodiment 1.

[0027] Figure 3 This is the second overall structural schematic diagram of the unfolding process of the extended backrest frame of the first embodiment.

[0028] Figure 4 This is the third overall structural schematic diagram of the unfolding process of the extended backrest frame of the first embodiment.

[0029] Figure 5 This is a schematic diagram of the overall structure of the extended backrest frame of Example 1 in the unfolded state.

[0030] Figure 6 This is a schematic diagram of the overall structure of the seat cushion lifting mechanism of Embodiment 1 before lifting.

[0031] Figure 7 It is a schematic diagram of the overall structure of the seat cushion lifting mechanism of the first embodiment after lifting.

[0032] Figure 8 This is a schematic diagram of the overall structure of the seat cushion lifting mechanism of Embodiment 2 before lifting.

[0033] Fig. 9 This is a schematic diagram of the overall structure of the seat cushion lifting mechanism of Embodiment 2 in a lifted state.

[0034] The accompanying drawings include: a seat back frame 1, an extended back frame 2, a ground support mechanism 3, an active support arm 301, a first driven support arm 302, a second driven support arm 303, a third driven support arm 304, an intermediate support leg 305, a rear support leg 306, a seat cushion lifting mechanism 4, a first movable seat cushion frame 401, a seat cushion adjustment shaft 402, a sliding shaft 403, a first strip sliding hole 404, a second movable seat cushion frame 405, a second strip sliding hole 406, a second hinge shaft connecting hole 407, a front hinge shaft 408, a recliner 5, a seat cushion fixing seat 6, a recliner lower connecting plate 7, an extended backrest lock 8, an unlocking pull strap 801, an extended backrest recovery pull strap 9, a supporting backrest coil spring 10, a recliner shaft 11, and an extended backrest coil spring 12. DETAILED DESCRIPTION

[0035] Example 1

[0036] See also Figure 1-7As shown, the present embodiment provides a car seat with a rear seat folding mechanism, comprising: an extended backrest frame 2 folded on a seat back frame 1, a ground support mechanism 3 arranged under the extended backrest frame 2 and the seat back frame 1, and a seat cushion lifting mechanism 4, the top of the seat back frame 1 is rotatably connected to the extended backrest frame 2, the bottom of the seat back frame 1 is rotatably connected to a seat cushion fixing seat 6 of the seat cushion frame assembly through a recliner 5, a recliner lower connecting plate 7 is installed at the bottom of the seat back frame 1 near the recliner 5, the recliner lower connecting plate 7 is connected to the seat cushion lifting mechanism 4 and drives the seat cushion to rise and fall; the seat cushion lifting mechanism 4 is used to automatically adjust the movable seat cushion frame 401 of the seat cushion frame assembly to be flush with the seat back frame 1 after folding, and the ground support mechanism 3 is used to automatically expand and contract the seat back frame 1 and the seat cushion lifting mechanism 4 ... back frame 1 is used to automatically expand and contract the seat back frame 1 and the seat back frame 1 is used to automatically expand and contract the seat back frame 1 and the seat back frame 1 is used to automatically expand and contract the seat back frame 1 and the seat back frame 1 is used to automatically expand and contract the seat back frame 1 and the seat back frame 1 is used to automatically expand and contract the seat back frame 1 and the seat back frame 1 is used to automatically expand and contract the seat Open and support the seat back frame 1 after being folded down and the extended back frame 2 after being unfolded; an extended back lock 8 and an extended back recovery strap 9 are arranged between the extended back frame 2 and the seat back frame 1, the extended back lock 8 is used to lock the free end (lower end) of the extended back frame 2 on the seat back frame 1, and the extended back recovery strap 9 is used to pull the extended back frame 2 to be folded to a folded state; an extended back coil spring 12 is mounted on the hinge shaft connecting the seat back frame 1 and the extended back frame 2, and the extended back coil spring 12 is used to assist the extension back frame in unfolding; a support back coil spring 10 (a structure for manually adjusting the recliner) is mounted on the recliner shaft connecting the seat back frame 1 and the recliner 5, and the support back coil spring 10 is used to lift the seat back frame 1 after being folded down to its initial position.

[0037] The anchor support mechanism 3 in this embodiment is a six-link automatic deployment and recovery structure, and the anchor support mechanism 3 includes: an active support arm 301, a first driven support arm 302, a second driven support arm 303, a third driven support arm 304, an intermediate support leg 305, and a rear support leg 306. The intermediate support leg 305 is hinged to a position near the top of the seat back frame 1, and the rear support leg 306 is hinged to the bottom of the extended back frame 2. One end of the active support arm 301 is hinged to the rear support leg 306, and the other end is hinged to the first driven support arm 302. One end of the first driven support arm 302 is hinged to the bottom of the extended back frame 2, and the other end is hinged to the The end is hinged to one end of the second driven support arm 303, the other end of the second driven support arm 303 is hinged to one end of the third driven support arm 304, the other end of the third driven support arm 304 is hinged to the middle support leg 305, and the extended backrest frame 2 and the seat backrest frame 1 drive the active support arm 301 during the unfolding process, the active support arm 301 drives the rear support leg 306 to unfold and stand upright and drives the first driven support arm 302, the first driven support arm 302 drives the second driven support arm 303, the second driven support arm 303 drives the third driven support arm 304, and the third driven support arm 304 drives the middle support leg 305 to unfold and stand upright.

[0038] The seat cushion lifting mechanism 4 in this embodiment includes: a first movable seat cushion frame 401, the rear end of the first movable seat cushion frame 401 is hinged on the seat cushion adjustment shaft 402 on the lower connecting plate 7 of the angle adjuster, the front end of the first movable seat cushion frame 401 is fixedly connected with a sliding shaft 403, a first strip sliding hole 404 is opened on the seat cushion fixing seat 6 below the first movable seat cushion frame 401, and the sliding shaft 403 of the first movable seat cushion frame 401 is slidably connected to the first strip sliding hole 404 of the seat cushion fixing seat 6 In the hole 404, when the seat back frame 1 is folded backward, the lower end of the lower connecting plate 7 of the recliner is driven to rotate forward around the recliner shaft 11, and the cushion adjustment shaft 402 on the lower connecting plate 7 of the recliner drives the rear end of the first movable cushion frame 401 to be lifted upward (in the Z direction) and flush with the folded seat back frame 1. At the same time, the front end of the movable cushion frame 401 is moved forward on the cushion fixing seat 6 through the sliding shaft 403, so that the first movable cushion frame 401 is flush with the folded seat back frame 1.

[0039] The locking tongue of the extended backrest lock 8 in this embodiment is installed in the middle position of the lower end of the seat backrest frame 1, and a locking hole is opened at the lower part of the extended backrest frame 2 corresponding to the position of the locking tongue. The unlocking pull strap 801 of the extended backrest lock 8 drives the locking tongue and the locking hole to unlock, and the pull rope end of the unlocking pull strap 801 is set near the unlocking handle of the recliner.

[0040] One end of the extended backrest recovery strap 9 in this embodiment passes through the strip avoidance hole on the side of the seat back frame 1, and the other end of the extended backrest recovery strap 9 passes through the strip avoidance hole opened on the side of the extended backrest frame 2. By pulling the two ends of the extended backrest recovery strap 9, the extended backrest frame 2 is manually folded on the back of the seat back frame 1.

[0041] Example 2

[0042] See also Figure 8-9As shown, the present embodiment provides a seat cushion lifting mechanism, including: a second movable seat cushion frame 405, a second strip-shaped sliding hole 406 is opened at the rear end of the second movable seat cushion frame 405, a second hinge shaft connecting hole 407 is opened at the front end of the second movable seat cushion frame 405, the second movable seat cushion frame 405 is connected to the seat cushion adjusting shaft 402 on the lower connecting plate 7 of the angle adjuster through the second strip-shaped sliding hole 406, a front hinge shaft 408 is fixedly connected to the seat cushion fixing seat 6 below the second movable seat cushion frame 405, and the second movable seat cushion frame 405 is connected to the seat cushion adjusting shaft 402 on the lower connecting plate 7 of the angle adjuster through the second strip-shaped sliding hole 406, and a front hinge shaft 408 is fixedly connected to the seat cushion fixing seat 6 below the second movable seat cushion frame 405. The shaft connecting hole 407 is hinged on the front end hinge shaft 408 on the cushion fixing seat 6. During the process of the seat back frame 1 being folded backward, the lower end of the lower connecting plate 7 of the recliner is driven to rotate forward around the recliner rotating shaft 11. The cushion adjustment rotating shaft 402 on the lower connecting plate 7 of the recliner drives the rear end of the second movable seat cushion frame 405 to be lifted upward and flush with the seat back frame 1 after being folded down. At the same time, the front end of the second movable seat cushion frame 405 is rotated upward on the cushion fixing seat 6 through the front end hinge shaft 408, so that the second movable seat cushion frame 405 is flush with the seat back frame 1 after being folded down.

[0043] The rest of the structure of this embodiment is the same as that of Embodiment 1.

[0044] Example 3

[0045] This embodiment provides a method for supporting a car seat with a rear seat folding mechanism, comprising the following steps:

[0046] Step S1: When the seat back frame 1 is laid down, the recliner 5 is unlocked and the unlocking strap 801 is pulled, so that the seat back frame 1 is unlocked and the extension back lock 8 is opened through the unlocking strap 801, and the seat back frame 1 is laid down backward. At this time, the extension back frame 2 is rebounded backward under the elastic force of the extension back coil spring, and the extension back frame 2 is automatically opened with the assistance of the elastic force of the extension back coil spring and the weight of the extension back frame 2;

[0047] Step S2: During the unfolding process of the extended backrest frame 2, the ground support mechanism 3 automatically opens and supports the bottom plate of the car trunk. When the seat back frame 1 is opened, the active support arm 301 drives the first driven support arm 302, the second driven support arm 303 and the third driven support arm 304 to open in linkage. The third driven support arm 304 pulls the middle support leg 305 to an upright state, and the active support arm 301 pulls the rear support leg 306 to an upright state. At this time, the extended backrest frame 1 and the seat back frame 1 can be kept completely horizontal, and the middle support leg 305 and the rear support leg 306 can provide the best support. The release of the ground support mechanism 3 is completely automatic during the entire folding process. During the seat folding process, the ground support mechanism 3 can be automatically recovered to the vacant position of the seat back frame 1 without occupying excess space.

[0048] Step S3: During the process of the seat back frame 1 being folded backward, the lower end of the lower connecting plate 7 of the recliner is driven to rotate forward around the recliner shaft 11, and the cushion adjustment shaft 402 on the lower connecting plate 7 of the recliner drives the rear end of the first movable cushion frame 401 to be lifted upward and flush with the folded seat back frame 1, and at the same time, the front end of the first movable cushion frame 401 is moved forward on the cushion fixing seat 6 through the sliding shaft 403, so that the first movable cushion frame 401 is flush with the folded seat back frame 1.

[0049] Step S4: When the seat back frame 1 is retracted, the unlocking strap 801 is pulled, and the seat back frame 1 is automatically lifted under the elastic force of the supporting back coil spring 10, and the extended back frame 2 is folded inward. At the same time, the extended back recovery strap 9 is pulled to complete the folding of the extended back frame 2 to the initial position and lock it through the extended back lock 8. At the same time, the ground support mechanism 3 will automatically retract the middle support leg 305 and the rear support leg 306 into the seat back frame 1. During the upward lifting process of the seat back frame 1, the cushion adjustment shaft 402 on the lower connecting plate 7 of the angle adjuster will drive the first movable cushion frame 401 downward to be retracted and adjusted to the initial position of the member's sitting posture.

[0050] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A car seat with a rear seat folding mechanism, characterized in that: include: An extended backrest frame folded on the seat backrest frame, a ground support mechanism arranged under the extended backrest frame and / or the seat backrest frame, and a seat cushion lifting mechanism, the top of the seat backrest frame is rotatably connected to the extended backrest frame, the bottom of the seat backrest frame is rotatably connected to the seat cushion frame assembly through a recliner, a recliner lower connecting plate is installed at the bottom of the seat backrest frame near the recliner, and the recliner lower connecting plate is connected to the seat cushion lifting mechanism and drives the seat cushion to rise and fall; The seat cushion lifting mechanism is used to automatically adjust the seat cushion frame to be flush with the seat back frame after folding down, and the foot support mechanism is used to automatically unfold and support the seat back frame after folding down and / or the extended back frame after unfolding; An extension backrest lock and an extension backrest recovery strap are provided between the extension backrest frame and the seat backrest frame, the extension backrest lock is used to lock the free end of the extension backrest frame on the seat backrest frame, and the extension backrest recovery strap is used to pull the extension backrest frame to be folded to a folded state; An extension backrest coil spring is mounted on the hinge shaft connecting the seat backrest frame and the extension backrest frame, and the extension backrest coil spring is used to assist the extension backrest frame in unfolding; The seat back frame is connected to the recliner shaft with a supporting back coil spring, or is provided with an angle adjustment drive motor for driving the recliner shaft to rotate. The supporting back coil spring and the angle adjustment drive motor are used to lift the seat back frame to the initial position after being folded down.

2. The vehicle seat with a rear seat folding mechanism according to claim 1, characterized in that: The ground support mechanism includes: an active support arm, a first driven support arm, a second driven support arm, a third driven support arm, an intermediate support leg, and a rear support leg, wherein the intermediate support leg is hinged at a position near the top of a seat back frame, and the rear support leg is hinged at a bottom position of an extended back frame, one end of the active support arm is hinged on the rear support leg, and the other end is hinged on the first driven support arm, one end of the first driven support arm is hinged at the bottom position of the extended back frame, and the other end is hinged on one end of the second driven support arm, the other end of the second driven support arm is hinged to one end of the third driven support arm, and the other end of the third driven support arm is hinged to the intermediate support leg, and the extended back frame and the seat back frame drive the active support arm during the unfolding process, the active support arm drives the rear support leg to unfold and stand upright and drives the first driven support arm, the first driven support arm drives the second driven support arm, the second driven support arm drives the third driven support arm, and the third driven support arm drives the intermediate support leg to unfold and stand upright.

3. The automobile seat with a rear seat folding mechanism according to claim 1, characterized in that: The seat cushion lifting mechanism includes: a movable seat cushion frame, a rear end of the movable seat cushion frame is hinged on the seat cushion adjustment shaft on the lower connecting plate of the recliner, the front end of the movable seat cushion frame is fixedly connected with a sliding shaft, a strip sliding hole is opened on the seat cushion fixing seat below the movable seat cushion frame, the sliding shaft of the movable seat cushion frame is slidably connected in the strip sliding hole of the seat cushion fixing seat, and the seat back frame drives the lower end of the lower connecting plate of the recliner to rotate forward around the recliner rotating shaft during the process of being folded backward, and the seat cushion adjustment shaft on the lower connecting plate of the recliner drives the rear end of the movable seat cushion frame to be lifted upward and flush with the seat back frame after being folded down, and at the same time, the front end of the movable seat cushion frame moves forward on the seat cushion fixing seat through the sliding shaft, so that the movable seat cushion frame is flush with the seat back frame after being folded down.

4. The automobile seat with a rear seat folding mechanism according to claim 1, characterized in that: The seat cushion lifting mechanism comprises: a movable seat cushion frame, a strip sliding hole is provided at the rear end of the movable seat cushion frame, and a hinge shaft connecting hole is provided at the front end of the movable seat cushion frame, and the movable seat cushion frame is connected to the seat cushion adjustment shaft on the lower connecting plate of the angle adjuster through the strip sliding hole. A front end hinge shaft is fixedly connected to the seat cushion fixing seat below the movable seat cushion frame, and the movable seat cushion frame is hinged on the front end hinge shaft on the seat cushion fixing seat through the hinge shaft connecting hole. During the process of the seat back frame being folded backward, the lower end of the lower connecting plate of the angle adjuster is driven to rotate forward around the angle adjuster rotating shaft, and the seat cushion adjustment rotating shaft on the lower connecting plate of the angle adjuster drives the rear end of the movable seat cushion frame to be lifted upward and flush with the seat back frame after being folded down. At the same time, the front end of the movable seat cushion frame is rotated upward on the seat cushion fixing seat through the front end hinge shaft, so that the movable seat cushion frame is flush with the seat back frame after being folded down.

5. The automobile seat with a rear seat folding mechanism according to claim 1, characterized in that: The lock tongue of the extended backrest lock is installed in the middle position of the lower end of the seat backrest frame, and a lock hole is opened at the lower part of the extended backrest frame corresponding to the position of the lock tongue. The unlocking pull strap of the extended backrest lock drives the lock tongue and the lock hole to unlock, and the pull rope end of the unlocking pull strap is arranged near the unlocking handle of the recliner.

6. The automobile seat with a rear seat folding mechanism according to claim 1, characterized in that: One end of the extended backrest recovery strap passes through the strip avoidance hole on the side of the seat back frame, and the other end of the extended backrest recovery strap passes through the strip avoidance hole opened on the side of the extended backrest frame. The two ends of the extended backrest recovery strap are pulled to manually fold the extended backrest frame onto the back of the seat back frame.

7. A method for supporting a car seat with a rear seat folding mechanism according to claim 1, characterized in that: The following steps are involved: Step S1: when the seat back frame is folded down, the recliner is unlocked and the unlocking strap is pulled, so that the seat back frame is unlocked and the extension back lock is opened through the unlocking strap, and the seat back frame is folded down backward. At this time, the extension back frame is rebounded backward under the elastic force of the extension back coil spring, and the extension back frame is automatically opened with the assistance of the elastic force of the extension back coil spring and the weight of the extension back frame itself; Step S2: During the unfolding process of the extended backrest frame, the ground support mechanism automatically opens and supports the bottom plate of the car trunk, wherein when the seat back frame is opened, the active support arm drives the first driven support arm, the second driven support arm and the third driven support arm to open in linkage, the third driven support arm pulls the middle support leg to an upright state, and the active support arm pulls the rear support leg to an upright state; Step S3: When the seat back frame is folded backward, the lower end of the lower connecting plate of the recliner is driven to rotate forward around the recliner rotating shaft. The cushion adjustment rotating shaft on the lower connecting plate of the recliner drives the rear end of the movable seat cushion frame to be lifted upward and flush with the folded seat back frame. At the same time, the front end of the movable seat cushion frame moves forward on the seat cushion fixing seat through the sliding rotating shaft, so that the movable seat cushion frame is flush with the folded seat back frame. Step S4: When the seat back frame is retracted, the unlocking strap is pulled, and the seat back frame is automatically lifted up under the elastic force of the supporting backrest coil spring, and the extended backrest frame is folded inward. At the same time, the extended backrest recovery strap is pulled to complete the folding of the extended backrest frame to the initial position and lock it with the extended backrest lock. At the same time, the ground support mechanism will automatically retract the middle leg and the rear leg into the seat back frame. During the upward lifting process of the seat back frame, the cushion adjustment shaft on the lower connecting plate of the recliner will drive the movable cushion frame downward to retract and adjust it to the initial position of the member's sitting posture.

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