Three-folding automobile seat with limiting hinge

Abstract

The utility model discloses a three-folding automobile seat with a limiting hinge. The three-folding automobile seat comprises a basic supporting framework, a suspension movable framework, a backrest framework, a turnover cushion framework, a neck pillow framework, the limiting hinge, a rotating linkage structure, a backrest driving telescopic cylinder, a turnover driving telescopic cylinder and a neck pillow driving telescopic cylinder. All the frameworks of the three-folding automobile seat are used in cooperation, convenient folding and unfolding of the cushion part, angle adjustment of the backrest part and flexible expansion of the use area are achieved, the structural design is more compact and reasonable, the folding and unfolding process is better matched with the interior space of an automobile, and then the applicability of the interior environment of the automobile is improved; meanwhile, the smoothness and stability of the adjusting process are ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of folding seat, especially to a three-fold automobile seat with limiting hinge. BACKGROUND

[0002] In order to improve the utilization rate of the automobile space, increase the riding comfort and convenience, the design of the automobile seat is more and more diversified, wherein the three-fold automobile seat is popular in the market due to its advantages of small space occupation after folding, convenient storage and the like. The existing three-fold automobile seat generally comprises a seat framework, a folding mechanism, a limiting device, a seat cushion, a backrest and the like, the seat framework is welded by metal pipe material, the folding mechanism generally selects hinges, sliding rails, locking devices and the like to realize the folding and unfolding of the seat, and the seat cushion and the backrest are made of sponge, fabric and the like. However, the existing three-fold automobile seat still has certain deficiencies in the structural design: the folding and unfolding process of the existing three-fold automobile seat is relatively cumbersome, a relatively large space is required for operation, and the matching degree with the internal space of the automobile is not high, which limits the multifunctional expansion of the automobile. SUMMARY

[0003] To solve the above technical problems, the utility model provides a three-fold automobile seat with limiting hinge. In order to have a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This part is not a general review, nor is it intended to determine the key / important constituent elements or delineate the protection scope of these embodiments. Its only purpose is to present some concepts in a simple form as a prelude to the detailed description below.

[0004] The utility model adopts the following technical scheme:

[0005] Provide a three-fold automobile seat with limiting hinge, including: basic support framework, suspension activity framework, turnover seat cushion framework, backrest framework and the neck pillow framework set on the backrest framework, the turnover seat cushion framework is installed in the front side of the suspension activity framework through the limiting hinge, the backrest framework is installed on the rear side of the basic support framework through the rotating link structure, the rotating link structure includes: the positioning base plate, the rotating support plate and the power shaft, the positioning base plate is set on the rear side lever of the basic support framework, the arc hollow slot is set on the positioning base plate, the front end of the rotating support plate is hinged with the power shaft, and the end part of the power shaft is embedded in the arc hollow slot, the power shaft is connected with the backrest drive telescopic cylinder, the rear end of the rotating support plate is connected with the backrest framework, the top of the rotating support plate is hinged with the top of the positioning base plate.

[0006] Further, the positioning base plate and the main body part of the rotating support plate are both in a circularly-angled triangular plate structure, the top of the rotating support plate is hinged to the top of the positioning base plate, so that the rotating support plate can swing along the hinge point on the inner side of the positioning base plate.

[0007] Further, the bottom side of the main body part of the positioning base plate extends to the front to form a first fastening plate, a rectangular through slot is formed on the first fastening plate, and the rod body of the rear side rod of the base support framework is welded in the rectangular through slot; the rear side of the main body part of the rotating support plate extends to the rear to form a second fastening plate, a notch is formed on the second fastening plate, and the rod body of the front side beam rod of the backrest framework is welded in the notch.

[0008] Further, the number of the positioning base plate and the rotating support plate is two, the two positioning base plates are arranged side by side, and the rotating support plate is located on the side facing each other of the positioning base plates; the front sides of the two positioning base plates are connected by a limiting plate, and a limiting slot is formed on the top of the rotating support plate to form a limiting block.

[0009] Further, the three-fold automobile seat with limiting hinge further comprises a neck pillow driving telescopic cylinder, the fixed end of the neck pillow driving telescopic cylinder is connected with the front side beam rod of the backrest framework, a guide seat is arranged on the rear side beam rod of the backrest framework, and the movable end of the neck pillow driving telescopic cylinder passes through the guide seat and is connected with the neck pillow framework.

[0010] Further, the two sides of the base support framework are provided with side support plates, and the two ends of the front side beam rod of the backrest framework are provided with butt joint plates which are hinged to the side support plates.

[0011] Further, the limiting hinge comprises a fixed side hinge plate, a flip side hinge plate, a driving hinge rod, a driven hinge rod and a driving shaft rod, the fixed side hinge plate is connected with the front suspension beam of the suspension movable framework, and the flip side hinge plate is connected with the flip seat cushion framework.

[0012] Further, the three-fold automobile seat with limiting hinge further comprises a flip driving telescopic cylinder, a long circular guide slot is formed on the fixed side hinge plate, one end of the driving hinge rod is hinged to the driving shaft rod, the end of the driving shaft rod is embedded in the long circular guide slot, the other end of the driving hinge rod is hinged to the flip side hinge plate, the middle part of the driving hinge rod is hinged to the middle part of the driven hinge rod, and the flip driving telescopic cylinder is hinged to the driving shaft rod.

[0013] The utility model discloses a beneficial effect brought about by the seat: the various frameworks of seat are used in cooperation, realize the convenient folding and unfolding of cushion part, and the angle adjustment of backrest part and the flexible extension of use area, and the structure design is more compact and reasonable, make folding and unfolding process and car interior space more matching, and then promote the applicability of in -vehicle environment, and simultaneously, the structure design of the application reduces the complexity of backrest part adjustment, and the rotation link structure is reliable and stable, and is not easy to wear and tear, guarantees the smooth and stable of seat execution action, and in addition, the outer cladding pad layer of framework is not easy to be extruded in the folding process. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, below will be to the drawing needed to use in the embodiment or prior art description briefly introduced, obviously, the drawing in the following description only some embodiments of the utility model, for ordinary skilled person in the art comes, under the premise of not paying creative labor, can also obtain other drawings according to these drawings.

[0015] Figure 1 It is the top view of a three-fold automobile seat with limiting hinge of the utility model;

[0016] Figure 2 It is the bottom view of a three-fold automobile seat with limiting hinge of the utility model;

[0017] Figure 3 It is the structure schematic view of the framework part of three-fold automobile seat of the utility model;

[0018] Figure 4 It is the structure schematic view of the framework part of three-fold automobile seat of the utility model;

[0019] Figure 5 It is the position schematic view of the rotation link structure of the utility model;

[0020] Figure 6 It is the structure schematic view of the rotation link structure of the utility model in one of the visual angle;

[0021] Figure 7 It is the structure schematic view of the rotation link structure of the utility model in another visual angle;

[0022] Figure 8 It is the structure schematic view of limiting hinge of the utility model;

[0023] Figure 9 It is the side structure schematic view of limiting hinge of the utility model when completely opening;

[0024] Figure 10 It is the side structure schematic view of limiting hinge of the utility model when completely folding.

[0025] Figure 11 Figure 1 is a position diagram of the fixed side hinge plate, the turnover side hinge plate, the driving hinge rod and the driven hinge rod of the utility model;

[0026] Figure 12 Figure 2 is a connection diagram of the fixed side hinge plate, the turnover side hinge plate, the driving hinge rod, the driven hinge rod and the framework of the utility model. DETAILED DESCRIPTION

[0027] The embodiments of the utility model will be described in detail below with reference to the drawings. It should be clear that the described embodiments are only some of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model protection.

[0028] As Figures 1-12 Indicated, in some demonstrative embodiments, a three-fold car seat with a limiting hinge is provided, including: a base support framework 1, a suspended movable framework 2, a backrest framework 3, a turnover cushion framework 4, a neck pillow framework 5, a limiting hinge 6, a rotating link structure 7, a backrest driving telescopic cylinder 8, a turnover driving telescopic cylinder 9, a neck pillow driving telescopic cylinder 10.

[0029] The base support framework 1 is used as the bottom structure of the seat, for providing stable support, which is generally installed in a fixed manner to a position point, and can also be installed at the use site through a guide rail system, to realize the forward and backward movement of the three-fold car seat, and provide higher flexibility for the folding and unfolding process. The suspended movable framework 2 is located above the base support framework 1, and is connected with the base support framework 1 through a pneumatic cylinder or other jacking mechanism, to realize the adjustment of the height of the suspended movable framework 2.

[0030] The backrest framework 3 is connected with the base support framework 1, for supporting the back of the passenger, and is pivoted at the rear end of the base support framework 1 to realize the angle adjustment of the backrest part. Meanwhile, the turnover cushion framework 4 is arranged at the front end of the seat, and is pivoted at the front end of the suspended movable framework 2 to realize the folding and unfolding of the cushion part. The framework arrangement is more reasonable, the balance is improved, and thus the stability of the unfolding and folding process of the seat is ensured.

[0031] In the embodiment, when the seat is in a fully open state, the framework parts of the seat are in turn the turnover cushion framework 4, the base support framework 1 and the backrest framework 3 from front to back, and the suspended movable framework 2 is located above the base support framework 1, and the neck pillow framework 5 is arranged on the backrest framework 3. At this time, the use area reaches the maximum, the frameworks are in the same plane, and the bed function is realized.

[0032] When folding is needed, first make the suspension movable framework 2 height drop until the lowest point and keep its own level, then, turn over drive telescopic cylinder 9 action, drive limit hinge 6 form change, and then drive the turnover cushion framework 4 to turn over, turn over to 180° after reaching the upper side of the suspension movable framework 2, at this time the seat cushion part reaches the completely folded state. At the same time, the backrest drive telescopic cylinder 8 action, drive rotation link structure 7 form change, to drive the backrest framework 3 to rotate to the front side, until to the limit angle provided by the rotation link structure 7, at this time the seat is converted to sitting position, realize the function of the seat.

[0033] The backrest framework 3 is installed on the rear side of the base support framework 1 through the rotation link structure 7. The rotation link structure 7 includes: positioning base plate 71, rotating support plate 72, power rotating shaft 73, limit plate 75.

[0034] The main part of the positioning base plate 71 and the rotating support plate 72 are both round triangle plate structure, and the top of the rotating support plate 72 is hinged with the top of the positioning base plate 71, so that the rotating support plate 72 can swing on the inside of the positioning base plate 71 along the hinge point. The hinge form of the rotating support plate 72 and the positioning base plate 71 is that the top of the two plates are both provided with a circular through hole 74, and a cylindrical rotating shaft is used to pass through each circular through hole 74, and the both ends of the cylindrical rotating shaft are welded and fixed in the circular through hole 74 of the positioning base plate 71, so that the rotating support plate 72 can swing around the cylindrical rotating shaft. The structure design of the positioning base plate 71 and the rotating support plate 72 and the hinge form of the two increase the stability of the rotation link structure 7, reduce the distortion and deformation in the swinging process, and improve the stability of the adjustment of the seat.

[0035] The positioning base plate 71 is arranged on the rear side of the base support framework. The connection form of the positioning base plate 71 and the base support framework 1 is that the bottom side of the main part of the positioning base plate 71 extends to the front to form an additional plate, i.e. the first fastening plate 711, the first fastening plate 711 is provided with a rectangular through slot 712, and the size and shape of the rectangular through slot 712 match the rod body of the rear side of the base support framework, and the rod body of the rear side of the base support framework is fixed in the rectangular through slot 712 by welding process.

[0036] The connection form of the rotation link structure 7 and the base support framework 1 can provide sufficient strength and stability at the hinge position of the two, reduce the shaking and vibration of the seat in the adjustment and use process. The design of the first fastening plate 711 makes the connection of the rotation link structure 7 and the base support framework 1 more firm, and the firm connection mode reduces the potential safety hazard caused by loose connection point, and improves the safety of the seat.

[0037] The rear end of the rotating support plate 72 is connected with the backrest framework 3, and the rotating support plate 72 is a key component for connecting the backrest framework 3 and the base support framework 1, so that the backrest framework 3 can rotate within a certain range to adapt to different sitting postures of passengers. Specifically, the connection form of the rotating link structure 7 and the backrest framework 3 is that the rear side of the main body of the rotating support plate 72 extends rearward to form a second fastening plate 721, and a notch 722 is formed on the second fastening plate 721, and the rod body of the front side beam rod 31 of the backrest framework is welded in the notch 722. The design of the notch 722 enables the rotating support plate 72 to firmly support the backrest framework 3, reduces shaking during rotation, improves the stability of the seat, and the design of the second fastening plate 721 makes the connection structure more compact, which helps to optimize the space in the vehicle.

[0038] The front end of the rotating support plate 72 is hinged with the power rotating shaft 73, and the hinge form is that a column hole is formed on the front end of the rotating support plate 72, and the power rotating shaft 73 penetrates through the column hole, so that the rotating support plate 72 can rotate around the power rotating shaft 73, and the rotating support plate 72 is driven by the power rotating shaft 73 to realize angle adjustment of the backrest framework 3.

[0039] An arc-shaped hollow groove 713 is formed on the positioning base plate 71, and the end of the power rotating shaft 73 is embedded in the arc-shaped hollow groove 713 and can move along the arc-shaped hollow groove 713. The arc-shaped hollow groove 713 not only provides guidance for the movement of the power rotating shaft 73, but also limits the angle adjustment of the backrest framework 3 within a certain range.

[0040] The power rotating shaft 73 is hinged with the movable end of the backrest driving telescopic cylinder 8, and the fixed end of the backrest driving telescopic cylinder 8 is hinged with the front side rod 12 of the base support framework. When the backrest driving telescopic cylinder 8 performs telescopic action, the power rotating shaft 73 can be pushed or pulled to move along the opening direction of the arc-shaped hollow groove 713, thereby driving the rotating support plate 72 to perform rotating action, and finally realizing the swinging of the backrest framework 3, that is, realizing the large-angle adjustment between the cushion part and the backrest part of the three-fold automobile seat of the embodiment, and the use area can be expanded after being completely flattened.

[0041] The number of the positioning base plates 71 and the rotating support plates 72 is two, the two positioning base plates 71 are arranged side by side, and the rotating support plates 72 are located on the side facing each other of the positioning base plates 71. The front sides of the two positioning base plates 71 are connected by a limiting plate 75, and the top of the rotating support plate 72 is provided with a gap slot 723 and a limiting block 724 is formed at the end of the slot. The gap slot 723 is designed so that when no limiting is needed, the limiting plate 75 will not affect the normal swinging of the rotating support plate 72, and the limiting block 724 can be used in cooperation with the limiting plate 75 when limiting is needed to realize the limiting function.

[0042] The limiting plate 75 not only increases the stability of the rotating linkage structure 7, but also forms a limiting structure. During the folding process of the backrest framework 3, when the rotating support plate 72 swings to a certain amplitude, the limiting block 724 will be blocked by the limiting plate 75, thereby preventing the rotating support plate 72 from continuing to rotate, thereby achieving further limiting of the backrest framework 3.

[0043] In this embodiment, the backrest driving telescopic cylinder 8 is used to provide driving force to realize the state change of the rotating linkage structure 7, thereby realizing the angle adjustment of the backrest part. In addition, the rotating linkage structure 7 can also provide stable rotating support. Furthermore, the structure design of the rotating linkage structure 7 enables the backrest framework 3 to be completely opened, i.e., to be in the same plane as the base support framework 1, thereby providing sufficient use area. In addition, the rotating support is provided while achieving the rotation limiting of the backrest framework 3, thereby improving the safety of the seat. At the same time, the structure design of the rotating linkage structure 7 simplifies the angle adjustment of the backrest part, so that the seat can be flexibly converted between a sitting position and a lying position, thereby meeting different use requirements.

[0044] The side support plates 11 are arranged on both sides of the base support framework 1, and the butt joint plates 32 are arranged at both ends of the front side beam 31 of the backrest framework. The butt joint plates 32 are hingedly connected with the side support plates 11, so as to further increase the stability of the backrest framework 3 during rotation.

[0045] The neckrest framework 5 is arranged on the backrest framework 3. The neckrest framework 5 is arranged to provide additional neck support and comfort. Specifically, the fixed end of the neckrest driving telescopic cylinder 10 is connected with the front side beam 31 of the backrest framework, the guide seat 34 is arranged on the rear side beam 33 of the backrest framework, the movable end of the neckrest driving telescopic cylinder 10 passes through the hole formed in the guide seat 34 and is connected with the neckrest framework 5. The design of the guide seat 34 enables the neckrest framework 5 to stably move up and down under the action of the neckrest driving telescopic cylinder 10, so as to provide personalized neck support according to the needs of the passenger and improve the riding comfort.

[0046] The turnover cushion framework 4 is installed on the front side of the floating movable framework 2 through the limiting hinge 6. The floating movable framework 2 is used to realize the flexible adjustment function of the cushion part, and is located above the base support framework 1 and carries part of the cushion. The turnover cushion framework 4 carries another part of the cushion.

[0047] The limiting hinge 6 comprises a fixed side hinge plate 100, a turnover side hinge plate 200, a driving hinge rod 300, a driven hinge rod 400, a driving shaft rod 500, a turnover side shaft rod 600, a fixed side shaft rod 700, a terminal shaft rod 800, and a middle support shaft rod 900.

[0048] A long circular guide groove 110 is formed on the fixed side hinge plate 100, which provides guidance and support for the movement of the driving shaft rod 500. The driving shaft rod 500 is connected with the fixed side hinge plate 100 through the long circular guide groove 110, and is hingedly connected with the turnover driving telescopic cylinder 9 to realize its translation. When the driving shaft rod 500 moves, it cooperates with the driving hinge rod 300 and the driven hinge rod 400 to realize the turnover action of the turnover side hinge plate 200.

[0049] The turnover side hinge plate 200 and the fixed side hinge plate 100 form a pair and together constitute the two end turnover parts of the limiting hinge 6. The fixed side hinge plate 100 and the turnover side hinge plate 200 are both provided with a mounting groove 120. The fixed side hinge plate 100 is connected with the front suspension beam 22 of the floating movable framework, i.e. the front suspension beam 22 of the floating movable framework is welded in the mounting groove 120. The turnover side hinge plate 200 is connected with the turnover cushion framework 4, i.e. the turnover cushion framework 4 is welded in the mounting groove 120 formed on the turnover side hinge plate 200. The rear suspension beam 21 of the floating movable framework is located between the side support plates 11.

[0050] When the fixed side hinge plate 100 and the turnover side hinge plate 200 are respectively installed on the floating movable framework 2 and the turnover cushion framework 4, and when the turnover side hinge plate 200 and the fixed side hinge plate 100 are completely folded, the two parts of the framework are stacked together to realize the seat function. At this time, the use area is small, which is suitable for driving or riding state. Similarly, when the turnover side hinge plate 200 and the fixed side hinge plate 100 are completely opened, the two parts of the framework are located in the same plane, at this time, the use area is large, which can provide more leg space or as a temporary rest plane.

[0051] The driving hinge rod 300 and the driven hinge rod 400 are both arc-shaped hinge rods.

[0052] The driving hinge rod 300 is the driving part of the limiting hinge 6, and one end of the driving hinge rod 300 is hingedly connected with the driving shaft rod 500, and the other end of the driving hinge rod 300 is hingedly connected with the turnover side hinge plate 200, so as to realize the transmission of driving force and further realize the turnover action of the turnover side hinge plate 200. The driven hinge rod 400 is the driven turnover part of the limiting hinge 6, and the two ends of the driven hinge rod 400 are hingedly connected with the fixed side hinge plate 100 and the terminal shaft rod 800 respectively.

[0053] The hinged form of the driving hinge rod 300 and the driving shaft rod 500 is as follows:

[0054] One end of the driving hinge rod 300 is provided with a first through hole 310, and the rod body of the driving shaft rod 500 penetrates through the first through hole 310, so that the driving hinge rod 300 can rotate around the driving shaft rod 500, and the end of the driving shaft rod 500 is embedded in the long circular guide groove 110 formed on the fixed side hinge plate 100.

[0055] The hinged form of the active hinge rod 300 and the turning side hinge plate 200 is as follows:

[0056] The two ends of the turning side shaft rod 600 are connected with the two turning side hinge plates 200 respectively; the other end of the active hinge rod 300 is provided with a second through hole 320, and the rod body of the turning side shaft rod 600 passes through the second through hole 320, so that the active hinge rod 300 can rotate around the turning side shaft rod 600.

[0057] The hinged form of the driven hinge rod 400 and the fixed side hinge plate 100 is as follows:

[0058] The two ends of the fixed side shaft rod 700 are connected with the two fixed side hinge plates 100 respectively, one end of the driven hinge rod 400 is provided with a first circular groove 410, and the rod body of the fixed side shaft rod 700 passes through the first circular groove 410, so that the driven hinge rod 400 can rotate around the fixed side shaft rod 700.

[0059] The hinged form of the driven hinge rod 400 and the terminal shaft rod 800 is as follows:

[0060] The other end of the driven hinge rod 400 is provided with a second circular groove 420, and the rod body of the terminal shaft rod 800 passes through the second circular groove 420, so that the driven hinge rod 400 can rotate around the terminal shaft rod 800; the inner side of the turning side hinge plate 200 is provided with a track groove 210, and the end part of the terminal shaft rod 800 is embedded in the track groove 210, so that the terminal shaft rod 800 can move along the opening direction of the track groove 210.

[0061] The middle part of the active hinge rod 300 and the middle part of the driven hinge rod 400 are hinged. Specifically, the middle part of the active hinge rod 300 and the middle part of the driven hinge rod 400 are both provided with a through groove 340, and the rod body of the middle support shaft rod 900 passes through the through groove 340, so that the active hinge rod 300 and the driven hinge rod 400 can both rotate around the middle support shaft rod 900.

[0062] When the turning drive telescopic cylinder 9 acts on the drive shaft rod 500, when the turning drive telescopic cylinder 9 is elongated, the drive shaft rod 500 is pushed to move along the long circular guide groove 110 to the direction of the turning side hinge plate 200, the position of the hinge point of the active hinge rod 300 and the driven hinge rod 400 is designed, so that the active hinge rod 300 and the driven hinge rod 400 are turned, finally driving the turning side hinge plate 200 to turn, when the drive shaft rod 500 reaches the other end of the long circular guide groove 110, the turning side hinge plate 200 is turned by 180°, reaching the completely folded state.

[0063] The above merely describes a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A three-fold car seat with a limiting hinge, characterized in that, include: The basic support frame, the suspended movable frame, the flip-up seat cushion frame, the backrest frame, and the neck pillow frame set on the backrest frame. The flip-up seat cushion frame is installed on the front side of the suspended movable frame via a limiting hinge, and the backrest frame is installed on the rear side of the basic support frame via a rotating link structure. The rotating link structure includes: a positioning base plate, a rotating support plate, and a power shaft. The positioning base plate is disposed on the rear rod of the basic support frame. An arc-shaped hollow groove is formed on the positioning base plate. The front end of the rotating support plate is hinged to the power shaft, and the end of the power shaft is embedded in the arc-shaped hollow groove. The power shaft is connected to the backrest drive telescopic cylinder. The rear end of the rotating support plate is connected to the backrest frame. The top of the rotating support plate is hinged to the top of the positioning base plate.

2. A three-fold car seat with a limiting hinge according to claim 1, characterized in that, The main body of both the positioning base plate and the rotating support plate is a plate-shaped structure with rounded corners and triangles. The top of the rotating support plate is hinged to the top of the positioning base plate so that the rotating support plate can swing along the hinge point inside the positioning base plate.

3. A three-fold car seat with a limiting hinge according to claim 2, characterized in that, The bottom side of the main body of the positioning base plate extends forward to form a first fastening plate. A rectangular through slot is provided on the first fastening plate, and the body of the rear rod of the base support frame is welded in the rectangular through slot. The rear side of the main body of the rotating support plate extends backward to form a second fastening plate. A notch is provided on the second fastening plate, and the body of the front beam of the backrest frame is welded in the notch.

4. A three-fold car seat with a limiting hinge according to claim 3, characterized in that, The number of positioning base plates and the number of rotating support plates are both two. The two positioning base plates are arranged side by side, and the rotating support plate is located on the side of the positioning base plates facing each other. The front sides of the two positioning base plates are connected by a limiting plate, and a clearance groove is opened on the top of the rotating support plate to form a limiting block.

5. A three-fold car seat with a limiting hinge according to claim 4, characterized in that, Also includes: A neck pillow drive telescopic cylinder; the fixed end of the neck pillow drive telescopic cylinder is connected to the front beam of the backrest frame, and a guide seat is provided on the rear beam of the backrest frame. The movable end of the neck pillow drive telescopic cylinder passes through the guide seat and is connected to the neck pillow frame.

6. A three-fold car seat with a limiting hinge according to claim 5, characterized in that, Side support plates are provided on both sides of the basic support frame, and connecting plates are provided at both ends of the front beam of the backrest frame. The connecting plates are hinged to the side support plates.

7. A three-fold car seat with a limiting hinge according to claim 6, characterized in that, The limiting hinge includes: a fixed side hinge plate, a flip side hinge plate, an active hinge rod, a driven hinge rod, and a drive shaft; the fixed side hinge plate is connected to the front suspension beam of the suspended movable frame, and the flip side hinge plate is connected to the flip seat cushion frame.

8. A three-fold car seat with a limiting hinge according to claim 7, characterized in that, Also includes: Tilting-driven telescopic cylinder; An elongated oval guide groove is provided on the fixed side hinge plate. One end of the active hinge rod is hinged to the drive shaft rod, and the end of the drive shaft rod is embedded in the elongated oval guide groove. The other end of the active hinge rod is hinged to the flip side hinge plate. The middle part of the active hinge rod is hinged to the middle part of the driven hinge rod. The tilting drive telescopic cylinder is hinged to the drive shaft.

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