Quick-switching double-posture seat

Abstract

The utility model provides a double-posture seat capable of switching quickly, which belongs to the technical field of seats, the double-posture seat has a first sitting posture and a second sitting posture, and comprises a main seat, a child seat and a switching mechanism, the main seat comprises a main cushion and a main backrest, the child seat comprises an auxiliary cushion and an auxiliary backrest, and the switching mechanism is arranged between the main cushion and the auxiliary backrest. The conversion mechanism comprises a first movement connecting part and a second movement connecting part, in the first sitting posture, the auxiliary seat cushion is embedded into the main backrest, the auxiliary backrest is embedded into the main seat cushion, in the second sitting posture, the auxiliary backrest moves to the opposite side of the main backrest, at least part of the auxiliary seat cushion moves out of the close-fitting face of the main backrest, and under driving of the driving source, the auxiliary seat cushion is connected with the main seat cushion. The first movement connecting part and the second movement connecting part move to realize conversion between two postures; according to the utility model, the conversion speed of the seat among different postures is greatly improved, meanwhile, automatic conversion is conveniently realized, and the use experience of a user is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of seats, in particular to a fast-converting dual-posture seat. Background Art

[0002] The seat belts in cars are designed according to adult standards and are suitable for adults weighing 36kg and over 140cm in height. If used by children, the seat belts will get stuck on the children's necks, which will be more harmful to children in the event of an accident. Therefore, child seats are specially designed. Child seats are seats used exclusively for children in cars. They are generally installed in passenger cars and fixed to the back seats to protect children's safety while the vehicle is driving; the correct use of child safety seats can effectively reduce the mortality rate of children in car accidents by 70%. Among them, child seats are divided into toddler seats and child seats. Usually, child seats are used for children aged 4-12, and toddler seats are used for children under 4 years old. Toddler seats require the backrest of the toddler seat to be moved to the opposite side of the backrest of the child seat.

[0003] In the prior art, for example, a patent with publication number CN116080497A discloses a child safety seat integrated in a car seat, comprising a child seat and a child backrest, wherein the car seat comprises a car seat and a car backrest, and the child backrest can be detachably connected to the car backrest and the child seat respectively. When it is necessary to form a seat for a young child on the car seat, the child seat and the child backrest need to be removed from the car seat first, and then assembled to form the young child seat. This slows down the posture conversion speed, is not conducive to realizing automatic conversion, and affects the user's use. Utility Model Content

[0004] The utility model aims to overcome the shortcomings and deficiencies of the prior art and to provide a fast-converting dual-posture seat.

[0005] The technical solution adopted by the utility model is as follows: The application provides a fast-converting dual-position seat, which has a first sitting position and a second sitting position, wherein the first sitting position is for adults or children to sit, and the second sitting position is for young children to sit, including:

[0006] A main seat, the main seat comprising a main seat cushion and a main backrest;

[0007] A child seat, the child seat comprising a secondary seat cushion and a secondary backrest;

[0008] and a conversion mechanism, the conversion mechanism comprising a first motion connection part and a second motion connection part, at least one of which is connected to a driving source, one of the first motion connection part and the second motion connection part being disposed between the auxiliary seat cushion and the main backrest, and the other being disposed between the auxiliary backrest and the main seat cushion;

[0009] Among them, when the dual-posture seat is in a first sitting posture, the auxiliary seat cushion is embedded in the main backrest and the auxiliary backrest is embedded in the main seat cushion. When the dual-posture seat is in a second sitting posture, the auxiliary backrest moves to the opposite side of the main backrest and the auxiliary seat cushion at least partially moves out of the body-contacting surface of the main backrest. Driven by a driving source, the first motion connection part and the second motion connection part generate movement to realize the conversion between the two postures.

[0010] In some embodiments, the first motion connection part and the second motion connection part have the same motion form.

[0011] In some embodiments, the first motion connection part and the second motion connection part adopt a sliding connection structure;

[0012] When the first sitting posture is converted to the second sitting posture, the auxiliary backrest slides to the opposite side of the main backrest under the drive of the driving source, and the auxiliary seat cushion at least partially slides out of the body-contacting surface of the main backrest to be able to accommodate a young child.

[0013] In some embodiments, the first motion connection part and the second motion connection part adopt a swing connection structure;

[0014] When the first sitting posture is converted to the second sitting posture, the auxiliary backrest is swung to the opposite side of the main backrest under the drive of the driving source, and the auxiliary seat cushion is at least partially swung out of the body-contacting surface of the main backrest to provide space for young children to sit on.

[0015] In some embodiments, the auxiliary seat cushion forms a part of the body-contacting surface of the main backrest, and the auxiliary backrest forms a part of the body-contacting surface of the main seat cushion.

[0016] In some embodiments, the first motion connection part is arranged between the auxiliary backrest and the main seat cushion, and the second motion connection part is arranged between the auxiliary seat cushion and the main backrest, wherein the first motion connection part is driven by the driving source as an active end, and the second motion connection part is driven as a passive end following the active end.

[0017] In some embodiments, the conversion mechanism includes a sliding actuator and a transmission shaft, the auxiliary seat cushion is slidably arranged relative to the main backrest, the auxiliary backrest is slidably arranged relative to the main seat cushion, the transmission shaft is connected to the sliding actuator, and at least one end thereof is provided with a first rolling tooth portion, the auxiliary backrest is provided with a sliding groove, and the inner wall of the sliding groove is provided with an internal tooth portion meshing with the first rolling tooth portion.

[0018] In some embodiments, the sliding actuator is arranged in the main seat cushion, two first guide plates are arranged on the auxiliary backrest at intervals, the sliding groove is arranged on the first guide plate, both ends of the transmission shaft are provided with the first hobbing part, and the sliding groove is arranged in an arc shape;

[0019] Two second guide rail plates are arranged at intervals on the main backrest, and linear sliding holes are arranged on the second guide rail plates. A sliding shaft is arranged on the auxiliary seat cushion corresponding to the sliding hole, and the sliding shaft extends into the sliding hole and slides with the sliding hole.

[0020] In some embodiments, the conversion mechanism includes a swing actuator, a linkage shaft, a first swing rod and a second swing rod, the two ends of the first swing rod are respectively hinged to the auxiliary seat cushion and the main backrest, the swing actuator drives the linkage shaft to rotate, one end of the second swing rod is hinged to the auxiliary backrest, and the other end is connected to the linkage shaft and rotates synchronously with it.

[0021] In some embodiments, two first connecting seats are spaced apart on the main backrest, one end of the first swing rod is hinged to the first connecting seat, a second connecting seat is provided on the main seat cushion, the swing actuator is provided on the second connecting seat, the swing actuator is connected to the middle part of the linkage shaft, and both ends of the linkage shaft are connected to the second swing rod.

[0022] The beneficial effects of the present invention are as follows: In the present invention, the seat posture change is achieved through the movement of two moving connecting parts, which greatly improves the conversion speed of the seat between different postures, and at the same time facilitates the realization of automatic conversion, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the utility model.

[0024] Figure 1 It is a schematic diagram of a child seat in the first sitting posture of the utility model;

[0025] Figure 2 It is a schematic diagram of a child seat in the second sitting posture of the utility model;

[0026] Figure 3 This is an exploded view of a child seat in the utility model;

[0027] Figure 4 It is a schematic diagram of another child seat in the first sitting posture of the utility model;

[0028] Figure 5 is a schematic diagram of another child seat in the second sitting posture of the utility model;

[0029] Figure 6It is a cross-sectional view of another child seat in the utility model;

[0030] Figure 7 It is a schematic diagram of a new child seat in the first sitting posture of the utility model;

[0031] Figure 8 It is a schematic diagram of a new child seat in the second sitting posture of the utility model;

[0032] Fig. 9 It is a schematic diagram of a new child seat in the utility model;

[0033] Fig.10 The utility model is a schematic diagram of a child seat. DETAILED DESCRIPTION

[0034] The following description provides specific application scenarios and requirements of this specification, with the purpose of enabling those skilled in the art to make and use the contents of this specification. Various local modifications to the disclosed embodiments will be apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments and applications without departing from the spirit and scope of this specification. Therefore, this specification is not limited to the embodiments shown, but to the widest scope consistent with the claims.

[0035] In the description of the present application, it should be noted that, unless otherwise expressly specified and limited, the terms "longitudinal", "transverse", "radial", "length", "width", "thickness", "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. These terms are mainly for better describing the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0036] Secondly, the terms "first", "second" and similar words do not indicate any order, quantity or importance, but are only used to distinguish different components and should not be understood as limitations on the embodiments of the present application.

[0037] In addition, the terms "installed", "set", "provided with", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements or components.

[0038] For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] Regarding the drawings of the present application, it should be clearly understood that the drawings are for illustration and description purposes only and are not intended to limit the scope of the present specification. It should also be understood that the drawings are not drawn to scale.

[0040] Embodiment 1:

[0041] The present application provides a fast-converting dual-posture seat that can be applied to seats of various vehicles, such as cars, ships, airplanes, etc., and will be described below using the application to car seats as an example.

[0042] like Figures 1 to 10 As shown, a fast-converting dual-position seat has a first sitting position and a second sitting position, wherein the first sitting position is for adults or children to sit, and the second sitting position is for young children to sit, comprising:

[0043] A main seat, the main seat comprising a main seat cushion and a main backrest;

[0044] A child seat, the child seat comprising a secondary seat cushion 1 and a secondary backrest 2;

[0045] And a conversion mechanism, the conversion mechanism includes a first motion connection part and a second motion connection part, at least one of which is connected to a driving source, and the first motion connection part and the second motion connection part, one of which is arranged between the auxiliary seat cushion 1 and the main backrest, and the other is arranged between the auxiliary backrest 2 and the main seat cushion; it should be understood that the motion connection part represents that the two parts can move relative to each other after being connected by this connection part, and are not fixed.

[0046] Preferably, the first motion connection part and the second motion connection part have the same motion form, for example, both use sliding motion or swinging motion. When the same motion is used to achieve seat posture conversion, the speed is faster and smoother.

[0047] Preferably, the first motion connection part is arranged between the auxiliary backrest 2 and the main seat cushion, and the second motion connection part is arranged between the auxiliary seat cushion 1 and the main backrest, wherein the first motion connection part is driven by a driving source as an active end, and the second motion connection part is a passive end, which can follow the movement of the active end, thereby reducing the cost of the product.

[0048] Among them, when the dual-posture seat is in the first sitting posture, the auxiliary seat cushion 1 is embedded in the main backrest and the auxiliary backrest 2 is embedded in the main seat cushion, the auxiliary seat cushion 1 forms a part of the main backrest body-contacting surface for sitting, and the auxiliary backrest 2 forms a part of the main seat cushion body-contacting surface for sitting.

[0049] When the dual-posture seat is in the second sitting posture, the auxiliary backrest 2 moves to the opposite side of the main backrest and the auxiliary seat cushion 1 at least partially moves out of the body-contacting surface of the main backrest. Driven by the driving source, the first motion connection part and the second motion connection part move to achieve conversion between the two postures.

[0050] Secondly, the main seat and child seat generally also include headrests, safety belts and other structures that a regular car seat should have.

[0051] Through the above arrangement, the seat posture is changed by the movement of the two motion connections, which greatly improves the speed of the seat's conversion between different postures. At the same time, it is easy to realize automatic conversion, thereby improving the user experience.

[0052] There are many structures of the first motion connection part and the second motion connection part. Based on the purpose of this application, a structure with smooth conversion and fast speed is preferably adopted, which is as follows:

[0053] Structure 1: The first motion connection part and the second motion connection part adopt a sliding connection structure;

[0054] When the first sitting posture is converted to the second sitting posture, the auxiliary backrest slides to the opposite side of the main backrest under the drive of the driving source, and the auxiliary seat cushion at least partially slides out of the body-contacting surface of the main backrest to be able to accommodate a young child.

[0055] like Figures 1 to 3 As shown, the conversion mechanism includes a sliding actuator 30 and a transmission shaft 31. The auxiliary seat cushion 1 is slidably arranged relative to the main backrest, and the auxiliary backrest 2 is slidably arranged relative to the main seat cushion. The transmission shaft 31 is connected to the sliding actuator 30, and at least one end thereof is provided with a first rolling tooth portion 311. The auxiliary backrest 2 is provided with a sliding groove 32, and the inner wall of the sliding groove 32 is provided with an internal tooth portion meshing with the first rolling tooth portion 311. Preferably, the first rolling tooth portion 311 is provided at both ends of the transmission shaft 31, and two sliding grooves 32 are provided on the auxiliary backrest 2 at intervals. This can improve the stability of the child seat during conversion. When the sliding actuator 30 drives the transmission shaft 31 to rotate, the auxiliary backrest 2 slides out from the main seat cushion to the opposite side of the main backrest, and at the same time, the auxiliary seat cushion 1 slides out from the main backrest, and the dual-posture seat enters the second sitting posture. A sliding rail type conversion structure is adopted, which has a fast conversion speed, good stability during conversion and strong controllability.

[0056] Secondly, the sliding actuator 30 is arranged in the main seat cushion, and two first guide plates 33 are arranged at intervals on the auxiliary backrest 2, and the sliding groove 32 is arranged through the first guide plate 33. The first rolling tooth portion 311 is arranged at both ends of the transmission shaft 31, and the sliding groove 32 is arranged in an arc shape; two second guide plates 34 are arranged at intervals on the main backrest, and a linear sliding hole 341 is arranged on the second guide plate 34, and a sliding shaft 35 is arranged on the auxiliary seat cushion 1 corresponding to the sliding hole 341, and the sliding shaft 35 extends into the sliding hole 341 and slides therewith, so that the child seat can form a child seat with the required tilt angle for children to sit on.

[0057] Furthermore, the plate thickness of the edge of the sliding groove 32 is greater than the plate thickness of the first guide plate 33, which increases the contact area between the first hobbing portion 311 and the inner tooth portion, thereby improving the strength of the two when they are in cooperation, making it easier for the first hobbing portion 311 to drive the first guide plate 33 to move.

[0058] Secondly, the cross section of the second guide plate 34 is L-shaped and has good supporting strength. The plate thickness at the edge of the sliding hole 341 is greater than the plate thickness of the second guide plate 34, which improves the stability of the auxiliary seat cushion 1 when sliding.

[0059] It also includes a bracket 36, which includes a mounting plate portion 361 and fixed plate portions 362 arranged on both sides of the mounting plate portion 361, and the fixed plate portion 362 is used to connect with the main seat cushion. The sliding actuator 30 is arranged on the mounting plate portion 361, and the mounting plate portion 361 is tilted downward toward one side of the main backrest, so that the auxiliary backrest 2 can move in the required direction to form a comfortable child seat.

[0060] like Figures 4 to 6As shown, the structure for forming the sliding conversion can also be: the conversion mechanism includes a first actuator 60, a second actuator 61, a first rotating shaft 62, a second rotating shaft 63, a first fixed seat 64 and a second fixed seat 65, the first actuator 60 is connected to the middle part of the first rotating shaft 62 and drives it to rotate, the first actuator 60 is arranged on the back of the auxiliary seat cushion 1, and is connected to the main seat cushion through the first fixed seat 64, the two ends of the first rotating shaft 62 are provided with a second hobbing portion 621, the second actuator 61 is connected to the middle part of the second rotating shaft 63 and drives it to rotate, the second actuator 61 is arranged on the back of the auxiliary backrest 2, and is connected to the main backrest through the second fixed seat 65 , third rolling gear portions 631 are provided at both ends of the second rotating shaft 63, first sliding plates 66 are provided on both sides of the auxiliary seat cushion 1, first sliding plates 66 are provided with first arc-shaped tooth portions 661, and the first arc-shaped tooth portions 661 are meshed with the second rolling gear portions 621, and second sliding plates 67 are provided on both sides of the auxiliary backrest 2, and second sliding plates 67 are provided with second arc-shaped tooth portions 671, and the second arc-shaped tooth portions 671 are meshed with the third rolling gear portions 631. Driven by the first actuator 60 and the second actuator 61, the first rotating shaft 62 and the second rotating shaft 63 rotate simultaneously, respectively driving the corresponding sliding plates to move, thereby driving the entire child seat to switch postures.

[0061] It should be understood that the above two sliding conversion structures can also be used in combination. Secondly, a limited position structure can also be set on the first rotating shaft 62 and the second rotating shaft 63 to limit the conversion of the child seat within a certain range.

[0062] Through the above arrangement, the dual-posture seat has a simple overall structure, good integrity, and low manufacturing cost. It is highly adaptable to car seats, especially has good stability during posture conversion and fast conversion speed.

[0063] Structure 2: The first motion connection part and the second motion connection part adopt a swing connection structure;

[0064] When the first sitting posture is converted to the second sitting posture, the auxiliary backrest is swung to the opposite side of the main backrest under the drive of the driving source, and the auxiliary seat cushion is at least partially swung out of the body-contacting surface of the main backrest to provide space for young children to sit on.

[0065] like Figures 7 to 9As shown, the conversion mechanism includes a swing actuator 40, a linkage shaft 41, a first swing rod 42 and a second swing rod 43, wherein the two ends of the first swing rod 42 are hinged to the auxiliary seat cushion 1 and the main backrest respectively, and the swing actuator 40 drives the linkage shaft 41 to rotate, one end of the second swing rod 43 is hinged to the auxiliary backrest 2, and the other end is connected to the linkage shaft 41 and rotates synchronously therewith, and the swing actuator 40 drives the linkage shaft 41 to rotate, driving the second swing rod 43 to rotate, driving the auxiliary seat cushion 1 and the auxiliary backrest 2 to swing together, wherein the auxiliary backrest 2 swings to the opposite side of the main backrest, and adopts a swing-type conversion structure with a fast conversion speed, but compared with the slide rail conversion structure, the stability of the child seat formed is general, therefore, it is also necessary to cooperate with a limiting structure and a supporting structure, such as increasing the number of swing rods and limiting the rotation range of the swing rods by a limiting structure.

[0066] Specifically, two first connecting seats 44 are spaced apart on the main backrest, one end of the first swing rod 42 is hinged to the first connecting seat 44, a second connecting seat 45 is provided on the main seat cushion, the swing actuator 40 is provided on the second connecting seat 45, the swing actuator 40 is connected to the middle part of the linkage shaft 41, and both ends of the linkage shaft 41 are connected to the second swing rod 43, thereby improving the stability of the child seat during conversion.

[0067] Furthermore, the driving source is manually driven or actuator driven. Preferably, the linear conversion motion is driven by an actuator, and the actuator is connected to the control system and power supply system on the vehicle. This seat is particularly suitable for the field of new energy vehicles and can further enhance the intelligence level of new energy vehicles, for example, in conjunction with voice control, visual detection and other functions, which will not be described in detail here.

[0068] In addition, the movement path of the child seat should preferably be close to an arc shape, so that the conversion is smoother and faster.

[0069] Furthermore, folding components are provided on both sides of the auxiliary seat cushion 1 and / or the auxiliary backrest 2, and the folding components are used to swing forward on both sides of the auxiliary seat cushion 1 and / or the auxiliary backrest 2 to form guard plates to improve the safety of the child seat. For the structure of the folding components, reference can be made to the patent previously applied for by the applicant, whose application number is 202410169743.5, or the patent with publication number CN116080497A which discloses a child safety seat integrated in a car seat, or the patent with publication number CN220535476 U which discloses a car seat integrated with a child seat.

[0070] like Fig.10As shown, the dual-posture seat also includes a connecting component, which includes a connecting actuator 50, a screw rod 51 and a slide 52. The connecting actuator 50 is arranged on the back of the auxiliary seat cushion 1, and a connecting rod 53 is arranged on the auxiliary backrest 2 near the auxiliary seat cushion 1. Connecting sockets 54 are arranged on both sides of the connecting rod 53, and connecting plug rods 55 are arranged on the slide 52 corresponding to the connecting sockets 54. When the connecting actuator 50 drives the screw rod 51 to rotate, the slide 52 slides on the screw rod 51, so that the connecting plug rod 55 can be inserted into the connecting socket 54 to form a connection, or the connecting plug rod 55 can be withdrawn from the connecting socket 54 to release the connection, thereby improving the convenience of disassembly and assembly of the auxiliary seat cushion 1 and the auxiliary backrest 2.

[0071] Embodiment 2:

[0072] Based on the first embodiment, the present application also provides a method for rapidly converting a dual-posture seat posture, the method comprising the following steps:

[0073] Step A: the auxiliary seat cushion moves synchronously relative to the main backrest and the auxiliary backrest moves relative to the main seat cushion in the same motion form, the auxiliary backrest is moved to the opposite side of the main backrest, and at the same time, the auxiliary seat cushion is at least partially moved out of the body-contacting surface of the main backrest, so that the dual-position seat enters the second sitting position;

[0074] Step B: The auxiliary seat cushion moves synchronously relative to the main backrest and the auxiliary backrest moves synchronously relative to the main seat cushion through the same movement form, moving the auxiliary backrest into the main seat cushion, and at the same time moving the auxiliary seat cushion into the main backrest, so that the dual-posture seat enters the first sitting posture.

[0075] It should be understood that the same motion forms are sliding motion or swinging motion, etc. When the same motion is used to achieve seat posture conversion, the speed is faster, the consistency is better, and the conversion is smoother. Among them, sliding motion should also include rolling motion.

[0076] In summary, after reading this detailed disclosure, those skilled in the art will appreciate that the foregoing detailed disclosure may be presented only by way of example and may not be restrictive. Although not explicitly stated herein, those skilled in the art will appreciate that the requirements of this application encompass various reasonable changes, improvements and modifications to the embodiments. These changes, improvements and modifications are intended to be proposed by the present application and are within the spirit and scope of the exemplary embodiments of the present application.

[0077] In addition, it should be understood that in the foregoing description of the embodiments of the present application, in order to help understand a feature and for the purpose of simplifying the present application, the present application combines various features in a single embodiment, drawing or its description. However, this does not mean that the combination of these features is necessary. When reading the present application, it is entirely possible for a person skilled in the art to mark out a part of the devices as a separate embodiment. In other words, the embodiments in the present application can also be understood as the integration of multiple secondary embodiments. This is also true when the content of each secondary embodiment is less than all the features of a single aforementioned disclosed embodiment.

[0078] Finally, it should be understood that the embodiments of the application disclosed herein are explanations of the principles of the embodiments of the present application. Other modified embodiments are also within the scope of the present application. Therefore, the embodiments disclosed in the present application are merely examples and not limitations. Those skilled in the art can adopt alternative configurations according to the embodiments in the present application to implement the application in the present application. Therefore, the embodiments of the present application are not limited to the embodiments accurately described in the application.

Claims

1. A fast-converting dual-position seat, having a first sitting position and a second sitting position, wherein the first sitting position is for adults or children, and the second sitting position is for young children, characterized in that: include: A main seat, the main seat comprising a main seat cushion and a main backrest; A child seat, the child seat comprising a secondary seat cushion and a secondary backrest; and a conversion mechanism, the conversion mechanism comprising a first motion connection part and a second motion connection part, at least one of which is connected to a driving source, one of the first motion connection part and the second motion connection part being disposed between the auxiliary seat cushion and the main backrest, and the other being disposed between the auxiliary backrest and the main seat cushion; Among them, when the dual-posture seat is in a first sitting posture, the auxiliary seat cushion is embedded in the main backrest and the auxiliary backrest is embedded in the main seat cushion. When the dual-posture seat is in a second sitting posture, the auxiliary backrest moves to the opposite side of the main backrest and the auxiliary seat cushion at least partially moves out of the body-contacting surface of the main backrest. Driven by a driving source, the first motion connection part and the second motion connection part generate movement to realize the conversion between the two postures.

2. A fast-converting dual-stance seat according to claim 1, characterized in that: The first motion connection part and the second motion connection part have the same motion form.

3. A fast-converting dual-stance seat according to claim 2, characterized in that: The first motion connection part and the second motion connection part adopt a sliding connection structure; When the first sitting posture is converted to the second sitting posture, the auxiliary backrest slides to the opposite side of the main backrest under the drive of the driving source, and the auxiliary seat cushion at least partially slides out of the body-contacting surface of the main backrest to be able to accommodate a young child.

4. A fast-converting dual-stance seat according to claim 2, characterized in that: The first motion connection part and the second motion connection part adopt a swing connection structure; When the first sitting posture is converted to the second sitting posture, the auxiliary backrest is swung to the opposite side of the main backrest under the drive of the driving source, and the auxiliary seat cushion is at least partially swung out of the body-contacting surface of the main backrest to provide space for young children to sit on.

5. A fast-converting dual-stance seat according to claim 1, characterized in that: The auxiliary seat cushion forms a part of the body-contacting surface of the main backrest, and the auxiliary backrest forms a part of the body-contacting surface of the main seat cushion.

6. A fast-converting dual-stance seat according to claim 3, characterized in that: The conversion mechanism includes a sliding actuator and a transmission shaft. The auxiliary seat cushion is slidably arranged relative to the main backrest, and the auxiliary backrest is slidably arranged relative to the main seat cushion. The transmission shaft is connected to the sliding actuator, and at least one end thereof is provided with a first rolling tooth portion. A sliding groove is provided on the auxiliary backrest, and an inner tooth portion meshing with the first rolling tooth portion is provided on the inner wall of the sliding groove.

7. A fast-converting dual-stance seat according to claim 6, characterized in that: The sliding actuator is arranged in the main seat cushion, two first guide rail plates are arranged at intervals on the auxiliary backrest, the sliding groove is arranged on the first guide rail plates, both ends of the transmission shaft are provided with the first hobbing part, and the sliding groove is arranged in an arc shape; Two second guide rail plates are arranged at intervals on the main backrest, and linear sliding holes are arranged on the second guide rail plates. A sliding shaft is arranged on the auxiliary seat cushion corresponding to the sliding hole, and the sliding shaft extends into the sliding hole and slides with the sliding hole.

8. The fast-converting dual-stance seat according to claim 4, characterized in that: The conversion mechanism includes a swing actuator, a linkage shaft, a first swing rod and a second swing rod. The two ends of the first swing rod are respectively hinged to the auxiliary seat cushion and the main backrest. The swing actuator drives the linkage shaft to rotate. One end of the second swing rod is hinged to the auxiliary backrest, and the other end is connected to the linkage shaft and rotates synchronously with it.

9. A fast-converting dual-stance seat according to claim 8, characterized in that: Two first connecting seats are arranged at intervals on the main backrest, one end of the first swing rod is hinged to the first connecting seat, a second connecting seat is arranged on the main seat cushion, the swing actuator is arranged on the second connecting seat, the swing actuator is connected to the middle part of the linkage shaft, and both ends of the linkage shaft are connected to the second swing rod.

10. The fast-converting dual-stance seat according to claim 3, characterized in that: The conversion mechanism includes a first actuator, a second actuator, a first rotating shaft, a second rotating shaft, a first fixed seat and a second fixed seat, the first actuator is connected to the middle part of the first rotating shaft and drives it to rotate, the first actuator is arranged on the back of the auxiliary seat cushion and is connected to the main seat cushion through the first fixed seat, second rolling gear portions are arranged at both ends of the first rotating shaft, the second actuator is connected to the middle part of the second rotating shaft and drives it to rotate, the second actuator is arranged on the back of the auxiliary backrest and is connected to the main backrest through the second fixed seat, third rolling gear portions are arranged at both ends of the second rotating shaft, first sliding plates are arranged on both sides of the auxiliary seat cushion, first sliding plates are arranged on the first sliding plates, the first arc-shaped tooth portions are meshed with the second arc-shaped tooth portions, and second sliding plates are arranged on both sides of the auxiliary backrest, second arc-shaped tooth portions are arranged on the second sliding plates, and the second arc-shaped tooth portions are meshed with the third rolling gear portions.

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