Vehicle seats that do not take up rear seat space

Abstract

The present invention relates to the technical field of vehicle accessories, and discloses a vehicle seat that does not occupy rear seat space, comprising a fixed seat support frame and a cushion frame and a backrest frame arranged in the seat support frame, wherein a seat cushion is installed on the cushion frame, and a backrest is installed on the backrest frame; the top of the backrest frame is hinged to the seat support frame through a first connecting rod mechanism, the backrest frame and the cushion frame are hinged at a joint through a second connecting rod mechanism, and the second connecting rod mechanism is hinged to the seat support frame at the same time, and an end of the cushion frame away from the backrest frame is hinged to the seat support frame through a third connecting rod mechanism; a cushion sliding control mechanism is provided on the cushion frame, which comprises a telescopic device connected to the seat support frame at an end, and a manual control end connected to the telescopic device and capable of controlling the operation of the telescopic device, when the manual control end is operated, the telescopic part of the telescopic device can be extended to push the seat cushion frame forward, or the seat cushion can be manually pushed backward to retract the telescopic part of the telescopic device and reset the seat cushion frame.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle accessories, and in particular to a vehicle seat which does not occupy rear seat space. Background Art

[0002] With the progress of society and the improvement of people's living standards, people have put forward higher and higher requirements for the comfort, safety and reliability of train riding. At present, the backrest adjustment of rail transit seats is mostly the overall rotation of the seat backrest itself. For such seats, if the installation distance between the front and rear adjacent seats is too small, the backrest angle of the front seat is increased, which will compress the activity space of the rear seat users, seriously affecting the comfort experience of the rear seat occupants.

[0003] Patent No. CN103661011B discloses a seat with a backrest and a seat cushion linkage, which can make the seat cushion move forward relative to the sliding seat frame, driving the linkage plate to rotate forward with the linkage shaft on the fixed seat frame as the fulcrum, thereby driving the backrest and the seat cushion to move forward as a whole, reducing the space occupied by the rear passengers. Although the patent can realize the linkage between the backrest and the seat, it still has the following defects:

[0004] 1) Due to the angle adjustment function of the recliner, when the seat cushion is moved forward a little bit, the backrest has already fallen back a lot. In other words, under the adjustment of the recliner, although the backrest and the seat are linked, the movement of the two is not subject to any external constraints, and the backrest will eventually occupy the back seat space, but it will occupy less back seat space than the traditional adjustable seat that only moves the backrest when the seat cushion moves;

[0005] 2) When the seat cushion is adjusted forward by the recliner, the seat cushion is pushed or retracted only by the adjusting force of the recliner. When a person sits on the seat cushion, this adjusting force may not be able to achieve the effect of controlling the movement of the seat cushion, and the person needs to leave the seat cushion to easily adjust the seat cushion and backrest. However, when the person leaves the seat cushion and then adjusts the angle of the seat cushion and backrest, the final adjusted angle may not be able to meet the comfort or appropriate angle required by the human body, that is, the angle adjustment effect of the seat when the human body is not on the seat cushion is certainly not as good as the angle adjustment effect when the human body is on the seat cushion. Summary of the invention

[0006] The technical problem solved by the present invention is to overcome the defects of the prior art and provide a vehicle seat which can be quickly adjusted to a comfortable position through the linkage between the backrest and the seat and does not occupy the rear seat space at all.

[0007] The purpose of the present invention is achieved through the following technical solutions:

[0008] A vehicle seat that does not occupy rear seat space comprises a fixed seat support frame and a seat cushion frame and a backrest frame arranged in the seat support frame, a seat cushion is installed on the seat cushion frame, and a backrest is installed on the backrest frame; the top of the backrest frame is hinged to the seat support frame through a first link mechanism, the backrest frame and the seat cushion frame are hinged at a joint through a second link mechanism, and the second link mechanism is hinged to the seat support frame at the same time, and the end of the seat cushion frame away from the backrest frame is hinged to the seat support frame through a third link mechanism; a seat cushion sliding control mechanism is provided on the seat cushion frame, the seat cushion sliding control mechanism comprises a telescopic device connected to the seat support frame at an end, and a manual control end connected to the telescopic device and capable of controlling the operation of the telescopic device, by operating the manual control end, the telescopic part of the telescopic device can be extended to push the seat cushion frame forward, or the seat cushion can be manually pushed back to retract the telescopic part of the telescopic device to reset the seat cushion frame, the second link mechanism links the seat cushion frame and the backrest frame during the operation of the telescopic device, and the first link mechanism and the third link mechanism respectively constrain the range of movement of the backrest frame and the seat cushion frame during the linkage process of the seat cushion frame and the backrest frame.

[0009] Furthermore, the telescopic device includes a guide sleeve hinged to the seat support frame, and a first elastic component and a sliding rod are arranged in sequence in the guide sleeve, and the end of the sliding rod extends out of the guide sleeve and is hinged to the end of the seat cushion frame away from the backrest frame; a plurality of grooves are arranged at intervals on the outer periphery of the sliding rod starting from the end close to the first elastic component, and the manual control end includes a traction rope, and a movable part which can be pulled by the traction rope is arranged at one end of the traction rope, and the movable part is located in a sleeve, and the sleeve is vertically connected to the guide sleeve, and the open end of the sleeve is closed by a fastener, and a second elastic component is installed between the fastener and the movable part, and the movable part is embedded in the groove of the sliding rod under the elastic force of the second elastic component.

[0010] Furthermore, the end of the sliding rod close to the first elastic component has a matching portion adapted to the first elastic component, and the first elastic component is sleeved on the outer periphery of the matching portion.

[0011] Furthermore, the manual control end includes a linkage switch arranged at the other end of the traction rope, and the linkage switch is manually turned up to pull the traction rope to make the telescopic device work.

[0012] Furthermore, the first connecting rod mechanism includes a rotating rod whose two ends are respectively hinged to the seat support frame and the backrest frame. When the backrest frame is in an initial state, the hinge point between the rotating rod and the seat support frame is located below the hinge point between the rotating rod and the backrest frame.

[0013] Furthermore, the second connecting rod mechanism includes a first articulated rod hinged to the backrest frame and the seat cushion frame at the same time, a second articulated rod is hinged to the other end of the first articulated rod, the end of the second articulated rod is hinged to the seat support frame, a third articulated rod is hinged to the middle section of the first articulated rod, the third articulated rod is hinged to the seat support frame, the third articulated rod is shorter than the second articulated rod, and when the backrest frame is in an initial state, the hinge point between the second articulated rod and the seat support frame is above the hinge point between the third articulated rod and the seat support frame, and the hinge point between the first articulated rod and the backrest frame and the seat cushion frame is below the hinge point between the third articulated rod and the seat support frame.

[0014] Furthermore, the third link mechanism includes a first link hinged to the seat cushion frame, a second link hinged at the end of the first link, the second link hinged to the seat support frame, a third link hinged on the middle section of the first link, and the other end of the third link hinged to the seat support frame. When the backrest frame is in an initial state, the hinge point of the second link and the seat support frame is located above the hinge point of the third link and the seat support frame and the hinge point of the first link and the seat cushion frame.

[0015] Furthermore, a dining table board and a flipping mechanism for flipping the dining table board around an axis to open to a horizontal position or to fit the backrest are installed on the backrest of the seat support frame.

[0016] Furthermore, the flipping mechanism includes a rotating shaft with one end fixed to the seat support frame and the other end hinged to the dining table board. Through strip grooves are respectively opened on both sides of the dining table board along the extension direction of the dining table board. The flipping mechanism also includes a pull rod, one end of which is hinged to the seat support frame, and a connecting piece is installed on the other end of the pull rod and the connecting piece is vertically inserted into the through strip groove. The pull rod can pull the connecting piece to move in the through strip groove. The flipping mechanism also includes a rack installed in the dining table board parallel to the through strip groove and a gear component meshing with the rack for transmission. The tooth surface of the rack faces the through strip groove, and one end of the gear component is connected to the connecting piece and moves with the connecting piece.

[0017] Furthermore, the seat support frame is provided with a marble structure at the edge in contact with the length direction of the dining table board. The marble structure is used to ensure that the dining table board is stably fitted to the seat support frame when folded. The marble structure includes a spring and a ball arranged at the end of the spring. The dining table board has a slot at the corresponding position of the ball for the ball to be dialed in and out.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1) The seat cushion frame and the backrest frame both move within the range of the seat support frame, and the seat support frame is fixed, so the seat will not have any impact on the back seat during adjustment and will not occupy any space in the back seat;

[0020] 2) The seat frame is controlled to move by the elastic component, sliding rod, movable part and traction rope. When the seat frame needs to move forward, the elastic component forces the seat frame to move forward by its own momentum. When the seat frame needs to be retracted, the person pushes the ground to apply a backward thrust to the seat frame to overcome the elastic force of the elastic component and retract the seat frame. During the process of pushing the seat frame forward, the person does not need to leave the seat. During the process of the backrest frame following the seat frame in linkage, the person can instantly adjust the angles of the two to find the most comfortable position.

[0021] 3) The dining table board installed behind the seat support frame can be flipped over. After using the dining table board, the rear seat passengers can flip it over to fit the seat support frame without occupying the rear seat space. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 An exploded view of the vehicle seat described in Example 1;

[0023] Figure 2 It is a three-dimensional structural diagram of the seat cushion frame and the backrest frame in linkage with each other as described in Example 1;

[0024] Figure 3 for Figure 2 Enlarged view of part I;

[0025] Figure 4 for Figure 2 Enlarged view of part II;

[0026] Figure 5 for Figure 2 Enlarged view of part III;

[0027] Figure 6 A top view of the structure of the seat cushion frame and the backrest frame linked together as described in Example 1;

[0028] Figure 7 for Figure 6 Middle AA section;

[0029] Figure 8 for Figure 6 Detailed diagram of the internal coordination between the middle traction rope and the telescopic device;

[0030] Fig. 9 This is a state diagram of the dining table board described in Example 1 being attached to the seat support frame (including a partial cross-section);

[0031] Fig.10 This is a partial structural schematic diagram of the dining table board described in Example 1;

[0032] Fig.11 for Fig.10 Middle BB section;

[0033] Fig.12This is the overall structural diagram of the vehicle seat described in Example 1 (the dining table is in a flipped open state). DETAILED DESCRIPTION

[0034] The present invention is further described below in conjunction with specific implementation methods, wherein the accompanying drawings are only used for exemplary descriptions and represent only schematic diagrams rather than actual drawings, and should not be understood as limitations on this patent; in order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted.

[0035] Example 1

[0036] Provide a Figure 1 The vehicle seat shown does not occupy the rear seat space and does not affect the activity space of the rear seat users. It includes a seat support frame 1 fixed in the vehicle and a seat cushion frame 2 and a backrest frame 3 arranged on the seat support frame. The seat support frame 1 is a key load-bearing member of the seat, and a left armrest and a right armrest (collectively referred to as armrests) are installed thereon. The armrest 11 is initially in a horizontal position and can be flipped up. After being flipped up as a whole, it is at least flush with the backrest. A headrest 12 is also installed on the top of the seat support frame 1, and the headrest should be able to provide comfortable lateral support for the passenger; a seat cushion 21 is installed on the seat cushion frame 2, and a backrest 31 is installed on the backrest frame 3. Taking into account the ergonomic requirements, the seat cushion 21 and the backrest 31 should ensure that the passengers can ride comfortably, conveniently, safely and reliably, and the seat cushion and the backrest are designed to be detachable for easy cleaning and replacement.

[0037] Among them, the seat cushion frame 2 and the backrest frame 3 are linkage frames, so that the seat back angle can be adjusted, and when adjusting, the bottom of the backrest frame is linked with the seat cushion frame to drive the seat cushion frame to move forward. Specifically, Figure 2 As shown, the top of the backrest frame 3 is hinged to the seat support frame 1 through a first connecting rod mechanism, the backrest frame 3 and the seat cushion frame 2 are hinged at the joint through a second connecting rod mechanism and the second connecting rod mechanism is also hinged to the seat support frame 1, and the end of the seat cushion frame 2 away from the backrest frame 3 is hinged to the seat support frame 1 through a third connecting rod mechanism.

[0038] See Figure 3 As shown, the first connecting rod mechanism includes a rotating rod 41 whose two ends are hinged to the seat support frame 1 and the backrest frame 3 respectively, and connecting blocks 42 are fixed on both sides of the top of the seat support frame 1, and the rotating rod 41 and the connecting blocks 42 are hinged by fasteners; when the backrest frame 3 is in the initial state, the hinge point of the rotating rod 41 and the seat support frame 1 is located below the hinge point of the rotating rod 41 and the backrest frame 3, so that the seat cushion frame has a larger downward movement threshold when the seat cushion frame 2 and the backrest frame 3 are subsequently linked.

[0039] See Figure 4 As shown, the second link mechanism includes a first hinged rod 51 hinged to the backrest frame 3 and the seat cushion frame 2 at the same time, the other end of the first hinged rod 51 is hinged to the second hinged rod 52, the end of the second hinged rod 52 is hinged to the seat support frame 1, and the middle section of the first hinged rod 51 is hinged to the third hinged rod 53, the third hinged rod 53 is hinged to the seat support frame 1, and the third hinged rod 53 is shorter than the second hinged rod 52; when the seat is in the initial state, the hinge points of the second hinged rod 52, the third hinged rod 53 and the seat support frame 1 are all located at On the same side of the first hinged rod 51, the hinge point of the second hinged rod 52 and the seat support frame 1 is located above the hinge point of the third hinged rod 53 and the seat support frame 1, and the hinge point of the first hinged rod 51, the backrest frame 3, and the cushion frame 2 is located below the hinge point of the third hinged rod 53 and the seat support frame 1; when the seat cushion frame 2 and the backrest frame 3 are linked, the second connecting rod mechanism plays a key role in mutually restricting the movement of the two, and at the same time, the second connecting rod mechanism can ensure that the seat cushion frame and the backrest frame do not get stuck when they are linked.

[0040] See Figure 5 As shown, the third link mechanism includes a first link 61 hinged to the seat cushion frame 2, a second link 62 is hinged at the end of the first link 61, the second link 62 is hinged to the seat support frame 1, a third link 63 is hinged on the middle section of the first link 61, and the other end of the third link 63 is hinged to the seat support frame 1. When the seat is in the initial state, the hinge point between the second link 62 and the seat support frame 1 is located above the hinge point between the third link 63 and the seat support frame 1 and the hinge point between the first link 61 and the seat cushion frame 2, and the hinge point between the second link 62 and the seat support frame 1 and the hinge point between the third link 63 and the seat support frame 1 are respectively located on both sides of the first link 61; the third link mechanism 3 provides constraints on the sliding amount of the seat cushion frame 2 moving forward.

[0041] like Figure 6 As shown, the seat cushion frame 2 is provided with a seat cushion sliding control mechanism, which includes a telescopic device 22 connected to the seat support frame 1 at its end, and a manual control end 23 connected to the telescopic device and capable of controlling the operation of the telescopic device. By operating the manual control end, the telescopic part of the telescopic device 22 can be extended to push the seat cushion frame 2 forward, or the seat cushion 21 can be manually pushed back to retract the telescopic part of the telescopic device 22 to reset the seat cushion frame 2. The second link mechanism links the seat cushion frame 2 and the backrest frame 3 during the operation of the telescopic device 22. The first link mechanism and the third link mechanism respectively constrain the range of motion of the backrest frame and the seat cushion frame during the linkage process of the seat cushion frame and the backrest frame.

[0042] Specifically, Figure 6 and Figure 7As shown, the telescopic device 22 includes a guide sleeve 221 hinged to the seat support frame 1 (the hinged position of the telescopic device and the seat support frame is close to the joint of the seat cushion frame and the backrest frame), and the first elastic component 222 and the sliding rod 223 are arranged in sequence in the guide sleeve 221. The end of the sliding rod 223 extends out of the guide sleeve 221 and is hinged to the end of the seat cushion frame 2 away from the backrest frame. The first elastic component 222 is always in a compressed state in the guide sleeve 221; the outer periphery of the sliding rod 223 is provided with a plurality of circles of grooves 2231 at intervals starting from the end close to the first elastic component 222, and the manual control end includes a traction rope 231, as shown in FIG. Figure 6 and Figure 8 As shown, a movable part 232 which can be pulled by the traction rope is provided at one end of the traction rope 231, and the movable part 232 is located in a sleeve 233, and the sleeve 233 is vertically connected to the guide sleeve 221. The open end of the sleeve 233 is closed by a fastener 234, and a second elastic component 235 is installed between the fastener 234 and the movable part 232. The movable part 232 is embedded in the groove 2231 of the sliding rod under the elastic force of the second elastic component 235, and the first elastic component and the second elastic component are preferably springs. When the traction rope 231 is manually pulled, the movable part 232 can be withdrawn from the groove 2231 of the sliding rod; when it is necessary to increase the angle between the seat cushion frame 2 and the backrest frame 3, once the movable part 232 withdraws from the groove 2231, the first elastic component 222 immediately pushes the sliding rod 223 forward. Of course, in order to make the adjustment of the seat always within the controllable range, the traction rope 231 is manually pulled in bursts, that is, the traction rope is pulled and the pulling action is maintained for a few seconds. After the movable part 232 just withdraws from the previous groove and the sliding rod 223 is pushed forward a little, the traction rope is abandoned, and the movable part 232 is immediately embedded in the next groove, and the sliding rod 223 is restricted from moving forward; when the seat needs to be reset, the operation is as above, except that at this time the seat cushion 21 needs to be manually pushed back to make the sliding rod 223 retract, and the movable part 232 is sequentially embedded in each groove 2231 when the sliding rod retreats (in fact, the sliding rod can also be retracted more at one time, and the movable part spans multiple grooves at one time and then embedded in the groove).

[0043] To ensure that the first elastic component 222 and the sliding rod 223 cooperate stably, Figure 7 As shown, the sliding rod 223 has a matching portion 2232 adapted to the first elastic component at the end close to the first elastic component 222, and the first elastic component 222 is sleeved on the outer periphery of the matching portion 2232, so as to ensure that the first elastic component and the sliding rod will never separate.

[0044] In addition, to facilitate manual operation of the traction rope, the manual control end 23 also includes a linkage switch 236 arranged at the other end of the traction rope 231. The linkage switch 236 is manually turned up to pull the traction rope to make the telescopic device work. The design of the linkage switch is exactly the same as the switch design for controlling the seat angle adjustment in the prior art, and will not be repeated here.

[0045] The seat cushion frame and the backrest frame are linked in a process as follows: manually push the linkage switch 236 upwards, pull the traction rope 231, trigger the telescopic device 22 to push the seat cushion frame 2 to swing forward, and at the same time, the second linkage mechanism is equivalent to using its hinge point 1 with the seat support frame as a fulcrum to drive the backrest frame 3 and the seat cushion frame 2 to swing in a linked manner, thereby achieving the purpose of increasing the angle between the seat back and the seat cushion; when it is necessary to reset the backrest and the seat cushion, manually push the linkage switch 236 upwards, pull the traction rope 231, and manually push the seat cushion 21 back to retract the telescopic device sliding rod 223, and the movable part 232 is finally embedded in the corresponding groove 2231 when the sliding rod 223 retreats to the extreme position, and the seat returns to its initial state.

[0046] like Figure 1 As shown, the seat of the present application is also equipped with a dining table board 7 on the backrest of the seat support frame 1. In order to ensure that the dining table board does not occupy the rear seat space when in use, a flipping mechanism is provided on the backrest for flipping the dining table board 7 around an axis to open it to a horizontal position or to fit the backrest.

[0047] See Fig. 9 , 10 As shown in Figure 11, the flip mechanism includes a rotating shaft 81 fixed to the seat support frame 1 at one end and hinged to the dining table 7 at the other end. Through strip grooves are respectively provided on both sides of the dining table 7 along the extension direction of the dining table. The flip mechanism also includes a pull rod 82, one end of the pull rod 82 is hinged to the seat support frame 1, and the other end of the pull rod 82 is equipped with a connecting piece 83 and the connecting piece is vertically inserted into the through strip groove. The pull rod 82 can pull the connecting piece 83 to move in the through strip groove. The flip mechanism also includes a rack 8 installed in the dining table 7 parallel to the through strip groove. 4 and a gear member 85 meshing with the rack for transmission, the tooth surface of the rack 84 faces the through strip groove, one end of the gear member is connected to the connecting member and moves with the connecting member; the gear member includes a sleeve 851 sleeved on the outer periphery of the connecting member 83 and a connector 852 fixedly connected to the sleeve, a rotating shaft is provided at the center of the connector 852, and the other end of the rotating shaft is a gear 853 meshing with the rack 84 for transmission; when the pull rod 82 pulls the connecting member 83 to move, the sleeve 851 drives the gear 853 to mesh with the rack 84 and move, thereby realizing stable and reliable flipping of the dining table board; Fig.12 The schematic diagram shows the structure of the dining table of the seat when it is flipped to a horizontal state.

[0048] To ensure that the dining table board will not flip over randomly after being attached to the seat support frame, Fig. 9 As shown, the seat support frame 1 is also provided with a marble structure at the edge in contact with the dining table board 7 in the length direction. The marble structure can ensure that the dining table board 7 is stably fitted to the seat support frame 1 when folded. The marble structure includes a spring 131 and a marble 132 arranged at the end of the spring. The dining table board 7 is provided with a slot 71 at the position corresponding to the marble 132 for the marble to be dialed in and out.

[0049] The opening and closing process of the dining table board is as follows: manually flip the dining table board 7, the ball 132 on the seat support frame 1 disengages from the slot 71 on the dining table board, and the dining table board 7 rotates around the rotating shaft 81 fixed on the seat support frame 1, driving the pull rod 82 to move, so that the connecting piece 83 moves in the through-bar groove, and then drives the gear 853 and the rack 84 to engage and slide to the extreme position. At this time, the dining table board 7 is opened to a horizontal state; when the dining table board needs to be folded, the dining table board 7 is manually flipped back again. The movement process of the various components of the flipping mechanism is opposite to the original walking process. When the dining table board 7 is folded to fit the back of the seat back, the ball 132 on the seat support frame 1 is re-engaged in the dining table board slot 71 to lock the limit.

[0050] The seat of the present application has the characteristics of simple structure, light weight, flexible adjustment, etc. The seat is not limited to use in rail vehicles, but can be used in various types of vehicles, and is suitable for vigorous promotion.

[0051] Obviously, the above embodiments are merely examples for clearly illustrating the technical solutions of the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A vehicle seat that does not occupy rear seat space, characterized in that: The seat frame is connected to the backrest frame by a first link mechanism, and the backrest frame is connected to the seat support frame by a second link mechanism, and the backrest frame is connected to the seat support frame by a third link mechanism. The seat frame is connected to the backrest frame by a third link mechanism, and the seat frame is connected to the backrest frame by a third link mechanism. The seat frame is connected to the seat support frame by a first link mechanism, and the seat frame is connected to the backrest frame by a second link mechanism. The seat frame is connected to the seat support frame by a third link mechanism. The seat frame is connected to the backrest frame by a third link mechanism. The seat frame is connected to the seat support frame by a third link mechanism. The seat frame is connected to the backrest frame by a third link mechanism. The seat frame is connected to the seat support frame by a third link mechanism. The seat frame is connected to the backrest frame by a third link mechanism. The seat frame is connected to the backrest frame by a third link mechanism. The seat frame is connected to the seat support frame by a third link mechanism. The seat frame is connected to the backrest frame by a third link mechanism. The seat frame is connected to the backrest frame by a third link mechanism. The seat frame is connected to the backrest frame by a third link mechanism. The seat frame is connected to the backrest frame by a third link mechanism. The seat frame is connected to the backrest frame by a third link mechanism. The first link mechanism includes a rotating rod with two ends respectively hinged to the seat support frame and the backrest frame; The second link mechanism includes a first hinged rod hinged to the backrest frame and the seat cushion frame at the same time, the other end of the first hinged rod is hinged to a second hinged rod, the end of the second hinged rod is hinged to the seat support frame, a third hinged rod is hinged to the middle section of the first hinged rod, the third hinged rod is hinged to the seat support frame, and the third hinged rod is shorter than the second hinged rod; The third link mechanism includes a first link hinged to the seat frame, a second link hinged to the end of the first link, the second link hinged to the seat support frame, a third link hinged to the middle section of the first link, and the other end of the third link hinged to the seat support frame.

2. The vehicle seat that does not occupy rear seat space according to claim 1, characterized in that: The telescopic device includes a guide sleeve hinged to the seat support frame, a first elastic component and a sliding rod are arranged in sequence in the guide sleeve, the end of the sliding rod extends out of the guide sleeve and is hinged to the end of the seat cushion frame away from the backrest frame; a plurality of grooves are arranged at intervals on the outer circumference of the sliding rod starting from the end close to the first elastic component, the manual control end includes a traction rope, one end of the traction rope is provided with a movable part which can be pulled by the traction rope, the movable part is located in a sleeve, the sleeve is vertically connected to the guide sleeve, the open end of the sleeve is closed by a fastener, a second elastic component is installed between the fastener and the movable part, and the movable part is embedded in the groove of the sliding rod under the elastic force of the second elastic component.

3. The vehicle seat that does not occupy rear seat space according to claim 2, characterized in that: The end of the sliding rod close to the first elastic component has a matching portion adapted to the first elastic component, and the first elastic component is sleeved on the outer periphery of the matching portion.

4. The vehicle seat that does not occupy rear seat space according to claim 2 or 3, characterized in that: The manual control end comprises a linkage switch arranged at the other end of the traction rope, and the linkage switch is manually turned up to pull the traction rope to make the telescopic device work.

5. The vehicle seat that does not occupy rear seat space according to claim 1, characterized in that: The first link mechanism includes a rotating rod with two ends respectively hinged to the seat support frame and the backrest frame. When the backrest frame is in an initial state, the hinge point between the rotating rod and the seat support frame is located below the hinge point between the rotating rod and the backrest frame.

6. The vehicle seat that does not occupy rear seat space according to claim 5, characterized in that: The second connecting rod mechanism includes a first articulated rod hinged to the backrest frame and the seat cushion frame at the same time, the other end of the first articulated rod is hinged to the second articulated rod, the end of the second articulated rod is hinged to the seat support frame, a third articulated rod is hinged to the middle section of the first articulated rod, the third articulated rod is hinged to the seat support frame, the third articulated rod is shorter than the second articulated rod, when the backrest frame is in an initial state, the hinge point between the second articulated rod and the seat support frame is above the hinge point between the third articulated rod and the seat support frame, and the hinge point between the first articulated rod and the backrest frame and the seat cushion frame is below the hinge point between the third articulated rod and the seat support frame.

7. The vehicle seat that does not occupy rear seat space according to claim 6, characterized in that: The third link mechanism includes a first link hinged to the seat cushion frame, a second link hinged to the end of the first link, the second link hinged to the seat support frame, a third link hinged to the middle section of the first link, and the other end of the third link hinged to the seat support frame. When the backrest frame is in an initial state, the hinge point of the second link and the seat support frame is located above the hinge point of the third link and the seat support frame and the hinge point of the first link and the seat cushion frame.

8. The vehicle seat that does not occupy rear seat space according to claim 1, characterized in that: A dining table board and a turning mechanism for turning the dining table board around an axis to open the dining table board to be horizontal or close to the backrest are installed on the backrest of the seat support frame.

9. The vehicle seat that does not occupy rear seat space according to claim 8, characterized in that: The flipping mechanism includes a rotating shaft with one end fixed to the seat support frame and the other end hinged to the dining table board. Through strip grooves are respectively opened on both sides of the dining table board along the extension direction of the dining table board. The flipping mechanism also includes a pull rod, one end of which is hinged to the seat support frame, and a connecting piece is installed on the other end of the pull rod and the connecting piece is vertically inserted into the through strip groove. The pull rod can pull the connecting piece to move in the through strip groove. The flipping mechanism also includes a rack installed in the dining table board parallel to the through strip groove and a gear component meshing with the rack for transmission. The tooth surface of the rack faces the through strip groove, and one end of the gear component is connected to the connecting piece and moves with the connecting piece.

10. The vehicle seat that does not occupy rear seat space according to claim 8 or 9, characterized in that: The seat support frame is provided with a marble structure at the edge that contacts the dining table board in the length direction. The marble structure is used to ensure that the dining table board fits stably against the seat support frame when folded. The marble structure includes a spring and a ball arranged at the end of the spring. The dining table board has a slot at the corresponding position of the ball for the ball to be dialed in and out.

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