Vehicle Safety Devices

Abstract

To provide a safety device for a vehicle capable of reducing time required for inflation expansion of a side airbag.SOLUTION: A safety device for a vehicle includes: a vehicle seat including a seat cushion 13 and a seat back 14 having a seat back frame 17 in the inside thereof; an inflator 23 that is provided in a side part of the vehicle seat and generates gas when actuated; a side airbag 22 that is arranged in a side part of the seat back, and can perform inflation expansion to the side or upward when the gas generated by the inflator is supplied to the inside; and a long tether 24 having one end connected to a portion corresponding to an upper part of the side airbag in the inflation expansion state and the other end connected to an upper part of a side frame 17A of the seat back frame or a cross member 17D horizontally installed between a pair of side frames.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a vehicle safety device equipped with a side airbag for protecting an occupant in the event of a side collision of the vehicle. [Background technology]

[0002] Conventionally, there is a vehicle safety device that is equipped with a side airbag that is attached to the side of a vehicle seat and inflates and deploys to the side (side) of a vehicle occupant using gas generated by a gas generator to protect the occupant in the event of a side collision of the vehicle. Regarding side airbags, for example, Patent Document 1 discloses an invention relating to a vehicle safety device equipped with a far side airbag. The vehicle safety device of this invention is configured such that a tether, both ends of which are fixed to a seatback frame, is connected to the outer surface of the airbag, and when the airbag is inflated and deployed, the tether extends upward from a portion of the upper end of the seatback frame that is further outside the vehicle than the headrest and hooks onto the headrest from the rear side of the seat, extends from the upper surface of the headrest to the upper surface of the airbag, and further extends through the vehicle inner side of the airbag to the seatback frame. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2014-51138 A Summary of the Invention [Problem to be solved by the invention]

[0004] The vehicle safety device of Patent Document 1 has the advantage that the direction of deployment of the airbag can be relatively stable by preventing contact between the occupant and the tether when the airbag is inflated and deployed. However, in the vehicle safety device of Patent Document 1, the tether is routed to the rear side of the seat, so the total length of the tether is long, which increases the time required for the airbag to inflate and deploy. In addition, because the tether is long, the force supporting the occupant from the side opposite to the collision side is weak, and there is a problem that the far side airbag does not provide sufficient occupant restraint performance.

[0005] The present invention has been made in view of the above-mentioned problems, and has an object to provide a vehicle safety device that can shorten the time required for inflating and deploying a side airbag. Another object of the present invention is to provide a vehicle safety device that can improve the occupant restraint performance of a side airbag. [Means for solving the problem]

[0006] In order to solve the above problems, the vehicle safety device according to the invention described in claim 1 comprises: A vehicle seat including a seat cushion and a seat back having a seat back frame therein; an inflator provided on a side of the vehicle seat and configured to generate gas when activated; a side airbag disposed on a side of the seat back and capable of inflating and deploying laterally and upwardly when gas generated by the inflator is supplied therein; a first tether having one end connected to a portion corresponding to an upper portion of the side airbag in an inflated and deployed state and the other end connected to an upper portion of a side frame of the seatback frame or to a cross member disposed horizontally between a pair of side frames; Equipped with 、 The side airbag is stored in a folded state inside a case that can be partially opened when the side airbag is inflated and deployed, and the case is disposed within a side support of a seat back, The case is box-shaped, and a slit through which the first tether can be inserted is formed in an upper wall of the case. It is characterized by: The case may be box-shaped, and a slit may be formed in an upper wall of the case, through which the first tether is inserted so as to be movable in the width direction.

[0007] The invention described in claim 2 is the vehicle safety device described in claim 1, The slit is provided on the upper wall of the case so that the first tether can move in the width direction. The present invention is characterized in that it is provided.

[0009] Claim 3 The invention described in claim 1 or 2 In the vehicle safety device according to the present invention, A long second tether is provided between a lower portion of the side airbag and a lower portion of the side frame.

[0010] Claim 4 The invention described in claim 3 In the vehicle safety device according to the present invention, The case is characterized in that a second slit is formed through which the second tether can be inserted.

[0011] Claim 5 The invention described in claim 3 or 4 In the vehicle safety device according to the present invention, The first tether is connected to the seatback frame via a first link arm that can rotate in the width direction of the seat around a predetermined center of rotation, and the first link arm functions to pull the first tether toward the center of the seat when a lateral load is input from an occupant seated in the vehicle seat.

[0012] Claim 6 The invention described in claim 5 In the vehicle safety device according to the present invention, The second tether is connected to the seatback frame via a second link arm that can rotate in the width direction of the seat around a predetermined rotation center, and the second link arm functions to pull the second tether toward the center of the seat when a lateral load is input from an occupant seated in the vehicle seat.

[0013] Claim 7 The invention described in claim6 In the vehicle safety device according to the present invention, The seat belt is characterized in that a push member capable of moving horizontally is provided, one end of which is connected to the end of the lateral load input side of the first link arm or the second link arm and the other end of which is arranged so as to face the inside of the vehicle seat. Effect of the Invention

[0014] According to the invention described in claim 1, when a lateral impact acts on an occupant seated in a seat due to a side collision of a vehicle, the occupant's body is supported by the inflated and deployed side airbag and the tether pulling it, so the occupant can be protected from the impact of the collision. In addition, because the side airbag is configured to inflate and deploy laterally and upward and pull the upper part of the side airbag toward the center of the seat by the tether, the side airbag has good occupant restraint performance and can effectively protect the occupant's head from the impact of the collision.

[0015] Moreover, because one end of the tether is connected to the side airbag and the other end is connected to the upper part of the side frame of the seatback frame or to a cross member spanning between a pair of side frames, the overall length of the tether is shortened, and the time required for the tether to deploy and move when the side airbag is inflated and deployed is shortened. Also, the force of the side airbag's inflation and deployment is transmitted to the seatback frame via the tether, deforming the frame, which generates a reaction force that pulls the upper part of the side airbag toward the center of the seat, effectively restricting the occupant's lateral movement.

[0016] Also, Claim 1 According to the invention described in the above, the side airbag is stored in a case in a folded state and disposed within the side support of the seatback, and the case is provided with a slit through which a tether can be inserted, so that when the side airbag inflates and deploys, the tether can quickly move along the slit in the case to the outside of the case and deploy.

[0017] moreover,Claim 1 According to the invention described in the above, the slit through which the tether is inserted is formed in the upper wall of the box-shaped case, so that the length of the tether connecting between the side airbag and the upper part of the side frame of the seatback frame or the cross member can be shortened, thereby shortening the time required for the tether to move and deploy. Furthermore, according to the invention described in claim 2, the slit is provided on the upper wall of the case so that the first tether can move in the width direction, and therefore when the side airbag inflates, the tether moves in the width direction along the slit of the case and can deploy outside the case.

[0018] Claim 3 According to the invention described in the above, a second tether is provided between the lower part of the side airbag and the lower part of the side frame, so that the load acting from the lower back (pelvis) of an occupant seated in the seat toward the outside of the seat during a side collision can be supported by the second tether, thereby effectively suppressing the lateral movement of the occupant during a side collision.

[0019] Claim 4 According to the invention described in the above, a second slit corresponding to the second tether is formed in the case that houses the side airbag, so that when the side airbag inflates and deploys, the second tether can quickly move along the second slit of the case to the outside of the case and deploy.

[0020] Claim 5 According to the invention described in the above, the second tether is connected to the seatback frame via a first link arm that can rotate in the width direction of the seat around a predetermined center of rotation, and when a lateral load is input from the occupant, the second tether functions to pull the first tether toward the center of the seat, making it possible to more effectively suppress lateral movement of the occupant's head in the event of a side collision.

[0021] Claim 6 According to the invention described in the above, the second tether is connected to the seatback frame via a second link arm that can rotate in the width direction of the seat around a predetermined center of rotation, and when a lateral load is input from the occupant, the second tether functions to pull the second tether toward the center of the seat, making it possible to more effectively suppress lateral movement of the occupant's hips during a side collision.

[0022] Claim 7 According to the invention described in the above, a push member capable of moving horizontally is provided which is connected to the end of the link arm on the lateral load input side, so that the lateral load from the occupant during a side collision can be effectively input to the link arm, thereby more effectively suppressing the lateral movement of the occupant's body. [Brief description of the drawings]

[0023] [Figure 1] 1 is a perspective view showing an example of a vehicle seat to which a vehicle safety device according to the present invention is applied; [Diagram 2] 1 is a perspective view showing an example of the configuration of a seat frame as a skeleton of a vehicle seat and a first embodiment of a vehicle safety device according to the present invention. [Diagram 3] 1 is a perspective view showing a state in which a side airbag of a vehicle safety device according to a first embodiment is inflated and deployed. FIG. [Figure 4] 1A to 1D are explanatory diagrams showing examples of a mounting structure for a tether of a vehicle safety device to a seat frame according to a first embodiment. [Diagram 5] FIG. 4 is a front view showing a modified example of the vehicle safety device of the first embodiment. [Figure 6] FIG. 4 is a perspective view showing a configuration of a second embodiment of a vehicle safety device according to the present invention. [Figure 7] FIG. 11 is a perspective view showing a state in which a side airbag of a vehicle safety device according to a second embodiment is inflated and deployed. [Figure 8] 11 shows a third embodiment of a vehicle safety device according to the present invention, in which (A) is a front view showing the arrangement of the link mechanism, (B) is an explanatory diagram showing the configuration of the link mechanism of (A), and (C) is an explanatory diagram showing the function of the link mechanism of (B). [Figure 9] 11 shows another example of the third embodiment of the vehicle safety device according to the present invention, in which (A) is a front view showing the arrangement of the link mechanism, (B) is an explanatory diagram showing the configuration of the link mechanism of (A), and (C) is an explanatory diagram showing the function of the link mechanism of (B). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] [First embodiment] A first embodiment of a vehicle safety device according to the present invention will be described below with reference to Fig. 1 to Fig. 4. Fig. 1 is a perspective view of a vehicle seat to which the vehicle safety device is applied, and Fig. 2 is a perspective view of a seat frame showing the skeleton of the seat in Fig. 1. In the following description, unless otherwise specified, the traveling direction of the vehicle is referred to as the front, the opposite direction is referred to as the rear, the left side of the occupant seated in the vehicle seat is referred to as the left direction, and the right side is referred to as the right direction. In this embodiment, the front-rear direction, left-right direction (width direction), and up-down direction of the vehicle seat are the same as the front-rear direction, left-right direction (width direction), and up-down direction of the vehicle.

[0025] 1 and 2, a vehicle safety device 10 according to the first embodiment is composed of a vehicle seat 11 and a side airbag device 12. The vehicle seat 11 includes a seat cushion 13 on which an occupant sits, a seat back 14 that is provided substantially perpendicularly to the rear end of the seat cushion 13 and serves as a backrest for the occupant, and a headrest 15 that is connected to the upper end of the seat back 14 and supports the head of the occupant. Although not particularly limited, in this embodiment, the vehicle seat 11 is a passenger seat in a right-hand drive vehicle, and the side airbag device 12 is a far side airbag.

[0026] The seat cushion 13 includes a seat cushion frame 16, which is a skeletal member as shown in FIG. 2, and the seat back 14 includes a seat back frame 17. The seat back frame 17 includes an inner side frame 17A and an outer side frame 17B extending upward from both the left and right rear ends of the seat cushion frame 16, and an upper frame 17C provided in the width direction so as to straddle the upper ends of the side frames 17A and 17B, and is formed in a substantially inverted U shape when viewed from the seat front-rear direction. In addition, a reinforcing cross member 17D is provided between the side frames 17A and 17B and is horizontally supported in parallel with the upper frame 17C. The lower ends of the side frames 17A and 17B are connected to the rear end of the seat cushion frame 16 so as to be tiltable.

[0027] On the other hand, the side airbag device 12 is disposed within a side support 14A of a seat back 14 as shown in FIG. 1, and is fixed to an inner side frame 17A of a seat back frame 17 as shown in FIG. Although not particularly limited, in this embodiment, the side airbag device 12 includes a case 21 made of resin having a box shape, for example, and stores an airbag 22 (see FIG. 3), an inflator 23 (see FIG. 1) that generates gas in the airbag 22, and a part of a tether (tension strap: long belt-like member) 24 that is stretched between the airbag 22 and the seat back frame 17 inside the case 21. The airbag 22 is stored in a folded state inside the case 21, and when the inflator 23 is ignited, the generated gas pushes the case 21 open and spreads outward.

[0028] 2, a slit 21a through which one end of the tether 24 is inserted is formed in the upper wall of the case 21, and the case 21 is configured so that, for example, the outer wall can be opened outward. Also, the pad inside the side support 14A is configured so that a part of it can be opened. As a result, when a collision sensor (not shown) for detecting a side collision of the vehicle detects an impact, the inflator 23 generates gas, and when the airbag 22 inflates due to the pressure of the expanding gas, the case 21 and the pads inside the side support 14A open, and the stitching of the outer skin tears, causing the bag to deploy outward (see Figure 3).

[0029] In addition, a tether 24, one end of which is connected to an airbag 22 stored in the case 21, is configured to be able to deploy and move to the outside of the case along a slit 21a in the upper wall of the case 21 when the airbag 22 is inflated. The tether 24 is formed in a strip shape from a flexible material that has high tensile strength and is not easily stretched, and one end is connected by sewing or the like to the upper part of the airbag 22, and the other end is joined to the upper part of the inner side frame 17A of the seatback frame 17. Instead of being joined to the inner side frame 17A, the tether 24 may be joined to the upper frame 17C or to the cross member 17D that is horizontally disposed between the side frames 17A and 17B. A specific method for joining the end of the tether 24 to the seatback frame 17 will be described in detail later.

[0030] The airbag 22 is formed into a bag shape by sewing together one or more pieces of base fabric formed by cutting out, for example, a nylon-based or polyester-based fabric material. As shown in FIG. 3, when inflated, the airbag 22 deploys forward and upward of the side support 14A of the seat back 14 and is formed to form an elongated oval or elliptical shape along the vertical direction of the vehicle, and is configured to restrain at least the head, shoulders and chest of the occupant so as to more effectively suppress lateral movement.

[0031] 1, the inflator 23 is formed in a cylindrical shape and is disposed with its axis aligned along the height direction of the seatback frame 17. Although not shown, a pair of upper and lower stud bolts protruding from the outer periphery of the inflator 23 toward the seatback frame 17 are provided, and these stud bolts penetrate the base fabric of the airbag 22, the inner wall of the case 21, and the side frame 17A of the seatback frame 17, and a nut is screwed onto the tip of the stud bolt, thereby fixing the inflator 23 to the seatback frame 17 together with the airbag 22.

[0032] As described above, in the vehicle safety device of this embodiment, both ends of the tether 24 are connected to the upper part of the airbag 22 and the upper part of the inner side frame 17A of the seatback frame 17, respectively, so that the overall length of the tether 24 is shorter than that of the vehicle safety device described in Patent Document 1. Also, the case 21 housing the airbag 22 is formed with a slit 21a through which the tether 24 passes, so that the tether 24 can be deployed outward along the slit 21a. Therefore, there is an advantage that the time required for the tether 24 to deploy and move when the airbag 22 is inflated and deployed is shortened, and the occupant can be restrained in a short time.

[0033] 4(A) to (D) show examples of specific structures for connecting the end of the tether 24 to the seat back frame 17. In FIG. Of these, FIG. 4(A) shows a structure in which a bracket 72 is fixed to a pipe 71, which is a component of the seatback frame 17, by welding or the like, and the end of the tether 24 is connected to this bracket 72 by a bolt 73 and a nut 74. 4(B) shows a configuration in which an end of tether 24 is inserted through an elongated hole in sleeve-shaped fastener 75 made of spring material that can fit into pipe 71, which is a component of seat back frame 17, and the folded-back portion is overlapped and fastened. Fastener 75 is provided with bolt 73 and nut 74 that tighten the open end so that it does not open.

[0034] The connection structure in Figure 4 (C) is formed with a pair of small holes 71a in a pipe 71, which is a constituent member of the seatback frame 17, and the legs of a handle-shaped wire 76 are inserted into these small holes. At the same time, the end of the tether 24 is inserted between the wire 76 and the pipe 71 and the folded-back portions are overlapped and secured. FIG. 4(D) shows a configuration in which the end of tether 24 is formed into a T-shape and a pair of parallel slits 71b are formed in pipe 71, which is a component of seat back frame 17, and the end of tether 24 is connected by being inserted through the pair of slits 71b. Although two slits 71b are provided in FIG. 4(D), one slit may be provided, but forming two slits in series as shown in the figure can increase the fixing force.

[0035] (Modification) FIG. 5 shows a modified example of the vehicle safety device of the first embodiment. In this modified vehicle safety device, the upper end of a retainer 25 provided to support a case 21 housing an airbag is extended to the vicinity of the upper frame 17C along the side frame 17A of the seat back frame 17. By providing such a retainer 25, the stability of the posture of the inflated and deployed airbag 22 can be improved.

[0036] In this modification, in addition to the upper tether (first tether) 24A, a second tether 24B is provided to connect the lower part of the airbag 22 to the lower part of the side frame 17A. In this case, it is preferable to form a second slit in a corresponding portion such as the lower part of the case 21, through which the tether 24B passes. According to this modified vehicle safety device, a second tether 24B is provided between the lower part of the airbag 22 and the lower part of the side frame 17A, so that when the occupant's body moves outward from the seat (to the left in the figure) due to the impact of a side collision, the load from the occupant's lower back (pelvis) can be supported by the second tether 24B.

[0037] [Second embodiment] Next, a second embodiment of the vehicle safety device according to the present invention will be described. 6, the vehicle safety device of the second embodiment has two cases 21A, 21B housing airbags arranged vertically on the inner side frame 17A of the seatback frame 17. The cases 21A, 21B have a similar structure to the case 21 of the first embodiment, and are provided at their upper portions with slits 21a, 21b through which the tethers 24A, 24B are inserted, respectively.

[0038] In the case 21A, similarly to the first embodiment, an end of the tether 24A is connected to an upper portion of the side frame 17A of the seat back frame 17. It may also be connected to a side portion of the upper frame 17C or the cross member 17D. On the other hand, an end of a tether 24B of the case 21B is connected to the middle part of the side frame 17A.

[0039] In the vehicle safety device of this embodiment, when the inflators in the cases 21A and 21B are activated, the airbags 22A and 22B are inflated and deployed in a vertically aligned state as shown in Fig. 7. This makes it possible to restrain and protect a wide area of ​​the occupant from the head to the area close to the waist. In addition, a tether 24A is connected between an upper portion of the airbag 22A and an upper portion of the side frame 17A of the seatback frame 17, and a tether 24B is connected between an upper portion of the airbag 22B and a middle portion of the side frame 17A. As a result, the overall length of the tethers 24A, 24B is shortened, and slits 21a, 21b through which the tethers 24A, 24B are inserted are formed in the cases 21A, 21B that house the airbags. As a result, similar to the first embodiment, the time required for the tethers 24A, 24B to be deployed when the airbags 22A, 22B are inflated and deployed is shortened, and the occupant can be restrained in a short time.

[0040] [Third embodiment] Next, a third embodiment of the vehicle safety device according to the present invention will be described. In the third embodiment, in a vehicle safety device having two tethers, a link mechanism 26A as shown in Fig. 8(B) is provided at the location indicated by the symbol A in Fig. 8(A), and a link mechanism 26B as shown in Fig. 9(B) is provided at the location indicated by the symbol B in Fig. 9(A). Note that only one of the link mechanisms 26A and 26B may be provided.

[0041] In Figures 8(B) and 9(B), the reference symbol C denotes a support shaft that serves as the center of rotation of the link arm 61. This support shaft C is supported by the side frame 17A and is configured to support the link arm 61 so that it can rotate in the width direction of the seat. Moreover, one end of the tether 24, the other end of which is connected to the airbag 22, is connected to the tip end (upper end in the figure) of the link arm 61, and a push rod 62 is connected to the other end (lower end in the figure) of the link arm 61 by a pin 63. The end of the push rod 62 opposite the pin 63 is located inside the seat (the side where the occupant is seated) and is provided so as to be movable in an approximately horizontal direction.

[0042] In the link mechanism 26A shown in Fig. 8(B), when the occupant's body moves outward from the seat (to the left in the figure) due to the impact of a side collision, a load F1 from the occupant's shoulder acts to push the push rod 62 outward. Then, as shown in Fig. 8(C), the lower end of the link arm 61 is pushed by the push rod 62, causing the link arm 61 to rotate clockwise, and a force F2 in the direction of the arrow is applied by the tether 24A connected to the upper end, pulling the airbag 22 inward from the seat. This makes it possible to restrain the occupant's shoulder from moving to the right, which is the outward direction of the seat.

[0043] In the link mechanism 26B shown in Fig. 9(B), when the occupant's body moves outward (to the left) of the seat due to the impact of a side collision, a load F3 from the occupant's lower back (pelvis) acts to push the push rod 62 outward. Then, as shown in Fig. 9(C), the lower end of the link arm 61 is pushed by the push rod 62, causing the link arm 61 to rotate clockwise, and a force F4 in the direction of the arrow is applied by the tether 24B connected to the upper end, pulling the airbag 22 inward (to the left) of the seat. This makes it possible to restrain the occupant's lower back from moving outward of the seat.

[0044] Although three embodiments of the present invention have been described above, the present invention is not limited to the above-mentioned embodiments, and various modifications can be made without departing from the spirit of the present invention. For example, in each of the above-mentioned embodiments, the airbag 22 is stored in the case 21, but it is also possible to configure the airbag 22 to be stored directly in the side support 14A of the seat back 14 without being stored in the case 21. Even when the airbag 22 is stored in the case 21, the inflator 23 may be disposed outside the case 21. In addition, in the above embodiment, the present invention has been described as being applied primarily to a vehicle seat in which the seatback frame 17 serving as the skeleton is made of a pipe, but the present invention is not limited thereto and can also be applied to a vehicle seat in which the skeleton of the seatback 14 is made of a pan frame.

[0045] Furthermore, in the above embodiment, the vehicle safety device according to the present invention is applied to the passenger seat, but it can also be applied to the driver seat, in which case the airbag is disposed on the side frame 17B opposite to the side shown in the drawing. In addition, in the third embodiment, the load from the occupant's waist or shoulder during a side collision may be applied to the push rod 62 via a pad in the side support, or a pressing plate of an appropriate size may be provided at the end of the push rod 62 to make it easier to input the load from the occupant to the link. [Explanation of symbols]

[0046] 10 Vehicle safety devices 11 Vehicle seats 12 Side airbag device 13 Seat cushion 14 Seat back 15 Headrest 16 Cushion Frame 17 Seat back frame 17A, 17B Side Frame 21 cases 21a Slit 22 Airbag 23 Inflator 24 Tether (tension strap) 25 Retainer 26A, 26B Link mechanism 61 Link arm 62 Push rod

Claims

1. A vehicle seat including a seat cushion and a seat back having a seat back frame therein; an inflator provided on a side of the vehicle seat and configured to generate gas when activated; a side airbag disposed on a side of the seat back and capable of inflating and deploying laterally and upwardly when gas generated by the inflator is supplied therein; a first tether having one end connected to a portion corresponding to an upper portion of the side airbag in an inflated and deployed state and the other end connected to an upper portion of a side frame of the seat back frame or to a cross member disposed horizontally between a pair of side frames; Equipped with The side airbag is stored in a folded state inside a case that can be partially opened when the side airbag is inflated and deployed, and the case is disposed within a side support of a seat back, The vehicle safety device, wherein the case is box-shaped, and a slit through which the first tether can be inserted is formed in an upper wall of the case.

2. A vehicle safety device as described in Claim 1, characterized in that the slit is provided on the upper wall of the case so that the first tether can move in the width direction.

3. 3. The vehicle safety device according to claim 1, wherein a second tether having a long length is provided between a lower portion of the side airbag and a lower portion of the side frame.

4. 4. The vehicle safety device according to claim 3, wherein the case is formed with a second slit through which the second tether can be inserted.

5. 5. The vehicle safety device according to claim 3, wherein the first tether is connected to the seat back frame via a first link arm that is rotatable in the width direction of the seat at a predetermined rotation center, and the first link arm functions to pull the first tether toward the center of the seat when a lateral load is input from an occupant seated in the vehicle seat.

6. The vehicle safety device according to claim 5, characterized in that the second tether is connected to the seat back frame via a second link arm that is rotatable in the width direction of the seat around a predetermined center of rotation, and the second link arm functions to pull the second tether toward the center of the seat when a lateral load is input from an occupant seated in the vehicle seat.

7. 7. The vehicle safety device according to claim 6, further comprising a push member having one end connected to the end of the first link arm or the second link arm on the lateral load input side and the other end arranged to face inward of the vehicle seat and movable in a horizontal direction.

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