Vehicle seat

Abstract

To inhibit submarine phenomenon with a simpler structure in a vehicle seat.SOLUTION: A vehicle seat 10 includes: a seat frame 32; a submarine restriction member 52 which may be displaced relative to the seat frame 32; and a moving mechanism part 54 which is disposed below the submarine restriction member 52 and may move the submarine restriction member 52 upward.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to vehicle seats. [Background technology]

[0002] During a frontal collision of a vehicle, a phenomenon in which an occupant breaks free from the restraints of a seat belt, slides off the seat, and slides under the dashboard, etc., is known as the submarine phenomenon. The submarine phenomenon is more likely to occur when the rearward reclining angle is large. In JP 2022-49424 A, when a vehicle collision is detected, the entire seat cushion is tilted by a lifting mechanism so that the front of the seat cushion is higher than the rear. This suppresses the occupant's movement forward relative to the seat, thereby suppressing the submarine phenomenon. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-49424 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-described conventional technology, it is necessary to tilt the entire seat cushion to prevent the submarine phenomenon. Therefore, there is a demand for a technology that can prevent the submarine phenomenon with a simpler configuration.

[0005] The present invention aims to solve the above-mentioned problems. [Means for solving the problem]

[0006] An aspect of the present disclosure is a vehicle seat comprising a seat frame, a submarine regulating member displaceable relative to the seat frame, and a movement mechanism disposed below the submarine regulating member and capable of moving the submarine regulating member upward. [Effects of the Invention]

[0007] According to the present disclosure, in the event of a vehicle collision, the submarine phenomenon can be suppressed with a simple configuration by moving the submarine prevention member upward using a movement mechanism. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing a frame of a vehicle seat and its surrounding structure according to an embodiment of the present invention. [Figure 2] FIG. 2 is a plan view showing the submarine prevention mechanism and its peripheral structure according to the first embodiment. [Figure 3] FIG. 3 is a front view showing the submarine prevention mechanism and its peripheral structure according to the first embodiment. [Figure 4] Fig. 4A is a cross-sectional view taken along line IVA-IVA in Fig. 2, showing a state before the submarine suppression mechanism according to the first embodiment is activated, and Fig. 4B is a cross-sectional view taken along line IVA-IVA in Fig. 2, showing a state after the submarine suppression mechanism according to the first embodiment is activated. [Figure 5] FIG. 5 is a front view of the cushion frame and the submarine suppression mechanism according to the second embodiment. [Figure 6] Fig. 6A is a diagram showing a submarine suppression mechanism according to a third embodiment, illustrating the state before the submarine suppression mechanism is activated, and Fig. 6B is a diagram showing the state after the submarine suppression mechanism according to the third embodiment is activated. [Figure 7] Fig. 7A is a diagram showing a state before the submarine prevention mechanism according to the fourth embodiment is activated, and Fig. 7B is a diagram showing a state after the submarine prevention mechanism according to the fourth embodiment is activated. [Figure 8] FIG. 8 is a front view showing a submarine prevention mechanism and its peripheral structure according to the fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] The vehicle seat 10 according to this embodiment shown in FIG. 1 is installed on a floor panel 12 of a vehicle. The vehicle seat 10 may be, for example, a driver's seat, a passenger seat, or a seat in the second or subsequent rows. The vehicle seat 10 may also be a seat installed in an autonomous vehicle that does not require a driver. The vehicle seat 10 may also be a seat installed in other vehicles such as trains and airplanes. In the following description, a case where the vehicle seat 10 is installed in an automobile will be described. In addition, in the following description, the seat width direction (direction of arrow W) is the direction perpendicular to the vehicle's fore-and-aft direction and the vertical direction (the vehicle's left-right direction). The seat width direction is the same direction as the vehicle width direction.

[0010] The vehicle seat 10 includes a seat cushion 14, a seat back 16, and a headrest 18. The seat cushion 14 is the portion on which an occupant sits. The seat back 16 is the portion against which the occupant rests. The seat back 16 is tiltable relative to the seat cushion 14. The lower end of the seat back 16 is rotatably connected to the rear end of the seat cushion 14.

[0011] The seat back 16 has a seat back frame 17. The vehicle seat 10 is equipped with a reclining mechanism (not shown). The reclining mechanism allows the inclination angle (reclining angle) of the seat back 16 relative to the vertical direction to be adjusted. The headrest 18 is connected to the upper end of the seat back 16. The headrest 18 supports the head of the occupant.

[0012] A seat belt device 20 is disposed in the vehicle. The seat belt device 20 is a mechanism for restraining an occupant in a vehicle seat 10. This seat belt device 20 is a three-point seat. Therefore, the seat belt device 20 includes a belt 22, a tongue plate 24, and a buckle 26. The belt 22 is a belt-shaped member for restraining an occupant seated in the vehicle seat 10.

[0013] One end of the belt 22 is fixed to one end of the seat cushion 14 in the seat width direction. The other end of the belt 22 is engaged with a retractor 28. The retractor 28 is a mechanism for retracting the belt 22, and is disposed, for example, at the bottom of a center pillar. An intermediate portion of the belt 22 is inserted between a tongue plate 24 and a belt guide 30. The tongue plate 24 is detachable from a buckle 26. The belt guide 30 is disposed, for example, at the top of a center pillar of the vehicle body. The buckle 26 is disposed at the other end of the seat cushion 14 in the seat width direction.

[0014] Next, the configuration of the seat cushion 14 will be described in detail.

[0015] The seat cushion 14 has a cushion frame 34. The lower end of the seatback frame 17 is rotatably connected to the rear end of the cushion frame 34. The cushion frame 34 and the seatback frame 17 form the seat frame 32 of the vehicle seat 10. In other words, the cushion frame 34 is a part of the seat frame 32.

[0016] The cushion frame 34 has a pair of cushion side frames 36, a front frame 38, and a rear frame 40. Hereinafter, the cushion side frames 36 will be simply referred to as "side frames 36." The pair of side frames 36 are arranged spaced apart in the seat width direction. The pair of side frames 36 are located at both ends of the cushion frame 34 in the seat width direction and extend in the front-to-rear direction of the vehicle. A pair of upper rails 42 are fixed to the lower ends of the pair of side frames 36, respectively. The pair of upper rails 42 are slidably supported by a pair of lower rails 44 fixed to the floor panel 12 of the vehicle body.

[0017] The front frame 38 connects the front ends of the pair of side frames 36. The front frame 38 extends in the seat width direction. One end of the front frame 38 in the seat width direction is fixed to one of the side frames 36. The other end of the front frame 38 in the seat width direction is fixed to the other side frame 36.

[0018] The rear frame 40 connects the rear ends of the pair of side frames 36. The rear frame 40 extends in the seat width direction. One end of the rear frame 40 in the seat width direction is fixed to one of the side frames 36. The other end of the rear frame 40 in the seat width direction is fixed to the other side frame 36.

[0019] Although not shown in detail, the seat cushion 14 further includes a seat cushion pad and a seat covering. The seat cushion pad is supported by a cushion frame 34. The seat cushion pad is covered with the seat covering.

[0020] The vehicle seat 10 further includes a submarine suppression mechanism 50A. The submarine suppression mechanism 50A is a mechanism for suppressing the submarine phenomenon of an occupant seated in the vehicle seat 10 in the event of a frontal collision of the vehicle. The submarine suppression mechanism 50A is located below a seat cushion pad (not shown) (between the seat cushion pad and the floor panel 12). The submarine suppression mechanism 50A includes a submarine restricting member 52 and a movement mechanism unit 54.

[0021] The submarine prevention member 52 is displaceable in the up-down direction (vertical direction) relative to the seat frame 32 (the pair of side frames 36). As shown in FIG. 2, the submarine prevention member 52 extends in the seat width direction (the direction of arrow W). The submarine prevention member 52 is arranged so as to span the pair of side frames 36. The submarine prevention member 52 is arranged forward of the center of the seat cushion 14 in the vehicle front-rear direction. The submarine prevention member 52 is a tubular member. It should be noted that the submarine prevention member 52 may also be a solid member.

[0022] Both ends of the submarine restriction member 52 are inserted into a pair of guide holes 56 formed in each of the pair of side frames 36. The submarine restriction member 52 is movable within the range of the pair of guide holes 56. A flange 52a is provided on each end of the submarine restriction member 52 to prevent the member from coming out of the pair of guide holes 56.

[0023] As shown in Fig. 4A, each guide hole 56 is an elongated hole extending in the vertical direction. The longitudinal direction of the guide hole 56 is parallel to the vertical direction. When the submarine prevention member 52 is located in the pre-movement position, which is the initial position, the submarine prevention member 52 is inserted into the lower part of the guide hole 56. The longitudinal direction of the guide hole 56 may be inclined with respect to the vertical direction.

[0024] A movement restricting portion 58 is provided on an edge 57 of the guide hole 56. The movement restricting portion 58 is a protrusion 59 that protrudes from the edge 57 toward the inside of the guide hole 56. In this embodiment, the movement restricting portion 58 is provided on a front edge 57a of the guide hole 56. The movement restricting portion 58 may also be provided on a rear edge 57b of the guide hole 56. The width of the guide hole 56 at the portion where the movement restricting portion 58 is provided is smaller than the outer diameter of the submarine restriction member 52. Therefore, the movement restricting portion 58 restricts the upward movement of the submarine restriction member 52 in the pre-movement position.

[0025] On the other hand, the movement restricting portion 58 allows the submarine restricting member 52 to move upward when a load equal to or greater than a predetermined value is applied to the submarine restricting member 52. As shown in Fig. 4B, when the submarine restricting member 52 is located in the post-movement position, the submarine restricting member 52 is inserted into the upper part of the guide hole 56. Note that the form of the movement restricting portion 58 is not limited to the protrusion 59. The movement restricting portion 58 may be, for example, an elastic member (such as a spring) that urges the submarine restricting member 52 downward.

[0026] As shown in FIG. 3, the movement mechanism 54 is disposed below the submarine restriction member 52. Note that, in FIG. 3, the front frame 38 and the rear frame 40 (see FIG. 1) are not shown to facilitate understanding. The movement mechanism 54 is capable of moving the submarine restriction member 52 upward. In this embodiment, the movement mechanism 54 is an airbag 55. The airbag 55 has a bag portion 60, an inflator 62, and a housing 64. The bag portion 60 and the inflator 62 are housed in the housing 64.

[0027] The bag portion 60 can be deployed by inflation. In Fig. 3, the bag portion 60 in the deployed state is shown by a phantom line. The inflator 62 generates gas for inflating the bag portion 60, and the gas inflates the bag portion 60, thereby deploying the bag portion 60. As shown in Fig. 4A, before the airbag 55 is deployed, the airbag 55 is located directly below the submarine prevention member 52 and is spaced apart from the submarine prevention member 52.

[0028] 4B, the bag portion 60 has a recess 66 that engages with the submarine prevention member 52 when the bag portion 60 is deployed. The recess 66 extends in the seat width direction. The recess 66 is a groove that is recessed downward from the upper end of the bag portion 60 in the deployed state and is open on both ends in the seat width direction.

[0029] In FIG. 3, the movement mechanism 54 (airbag 55) is controlled by a control unit 70. The control unit 70 is attached to the vehicle seat 10 or the vehicle body. The control unit 70 may be an ECU (Electronic Control Unit) mounted on the vehicle. The control unit 70 is configured by a processor such as a CPU (Central Processing Unit), that is, a processing circuitry. Impact information is supplied to the control unit 70 from an impact sensor 72 (acceleration sensor, etc.) provided in the vehicle. When the control unit 70 detects a frontal collision of the vehicle based on the impact information, it activates the inflator 62 to deploy the bag unit 60.

[0030] The moving mechanism 54 may be configured by a mechanism other than the airbag 55. For this reason, the moving mechanism 54 may be, for example, an actuator equipped with a motor. Alternatively, the moving mechanism 54 may be a mechanism that has a spring and uses elastic energy stored in the spring to instantly lift the submarine restricting member 52. A plurality of moving mechanisms 54 may be arranged along the seat width direction.

[0031] As shown in FIG. 1 , the cushion frame 34 further has a base portion 74. The base portion 74 is connected to the pair of side frames 36. Specifically, the base portion 74 extends in the seat width direction between the pair of side frames 36. One end of the base portion 74 is connected to the lower portion 36U of one of the side frames 36. The other end of the base portion 74 is connected to the lower portion 36U of the other side frame 36. The base portion 74 is spaced upward from the floor panel 12. The base portion 74 may be a plate-like member having a thickness in the up-down direction.

[0032] As shown in Fig. 2, the airbag 55 and the base portion 74 are disposed in a position overlapping the submarine prevention member 52 when viewed in the vertical direction. As shown in Fig. 3, the airbag 55 is disposed on the base portion 74. The airbag 55 is disposed in the center of the base portion 74 in the seat width direction (direction of arrow W). Therefore, the airbag 55 faces the center of the submarine prevention member 52 in the seat width direction.

[0033] The submarine prevention mechanism 50A provided in the vehicle seat 10 configured as described above operates as follows.

[0034] In FIG. 1, the submarine suppression mechanism 50A mounted on the vehicle seat 10 is activated when a vehicle crashes head-on with an occupant seated in the vehicle seat 10. Specifically, when the vehicle crashes head-on, the occupant begins to inertially move forward relative to the vehicle seat 10. Meanwhile, in FIG. 4A, the control unit 70 detects a vehicle head-on collision by receiving information about the impact from the impact sensor 72. As a result, the control unit 70 activates the inflator 62, as shown in FIG. 4B. When the inflator 62 is activated, gas is introduced into the bag portion 60, causing the bag portion 60 to instantly deploy (inflate).

[0035] As the bag portion 60 unfolds, the bag portion 60 pushes up the submarine restriction member 52. This causes the submarine restriction member 52 to rise. Specifically, the submarine restriction member 52 moves from the lower part to the upper part of the guide hole 56. In the process of moving from the lower part to the upper part of the guide hole 56, the submarine restriction member 52 climbs over the movement restriction portion 58 provided in the guide hole 56. Furthermore, as the bag portion 60 unfolds, the submarine restriction member 52 engages with a recess 66 formed in the bag portion 60.

[0036] In this manner, the submarine prevention member 52 rises. As a result, the movement of the occupant who tends to move forward due to the inertial force in the event of a frontal collision of the vehicle is restricted by the submarine prevention member 52. This makes it possible to suppress the occurrence of the submarine phenomenon.

[0037] This embodiment has the following advantages.

[0038] As described above, the vehicle seat 10 includes the submarine prevention member 52 and the movement mechanism 54 that can move the submarine prevention member 52 upward. With this configuration, in the event of a frontal collision of the vehicle, the submarine phenomenon can be suppressed with a simple configuration by moving the submarine prevention member 52 upward using the movement mechanism 54.

[0039] The moving mechanism 54 is an airbag 55. With this configuration, a mechanism for instantly moving the submarine restricting member 52 upward can be easily realized.

[0040] 1, the submarine restriction member 52 is inserted into a pair of guide holes 56 formed in the pair of side frames 36. The submarine restriction member 52 is movable within the range of the pair of guide holes 56. With this configuration, the guide holes 56 can restrict the distance and direction of movement of the submarine restriction member 52.

[0041] 4A, a movement restricting portion 58 that restricts the upward movement of the submarine restricting member 52 is provided on each edge 57 of the pair of guide holes 56. The movement restricting portion 58 allows the submarine restricting member 52 to move upward when a load equal to or greater than a predetermined value is applied to the submarine restricting member 52. With this configuration, the movement of the submarine restricting member 52 can be restricted except when the movement mechanism portion 54 is operating.

[0042] The airbag 55 is disposed on a base portion 74 that is connected to the pair of side frames 36. With this configuration, the airbag 55 can be easily disposed in the vehicle seat 10.

[0043] 4B, the bag portion 60 has a recess 66 that engages with the submarine restriction member 52 when the bag portion 60 is deployed. With this configuration, the deployment force of the airbag 55 can be efficiently transmitted to the submarine restriction member 52 when the airbag 55 is deployed.

[0044] 2, the airbag 55 is disposed in a position where it overlaps with the submarine prevention member 52 when viewed from the vertical direction. With this configuration, the deployment force of the airbag 55 can be efficiently transmitted to the submarine prevention member 52.

[0045] In the vehicle seat 10, instead of the submarine prevention mechanism 50A according to the above-described embodiment (first embodiment), a submarine prevention mechanism according to another embodiment described below may be employed.

[0046] The submarine suppression mechanism 50B according to the second embodiment shown in FIG. 5 is configured by adding a support portion 78 to the submarine suppression mechanism 50A according to the first embodiment described above (FIG. 1, etc.). The support portion 78 is disposed below the base portion 74. Specifically, the support portion 78 is disposed between the floor panel 12 and the base portion 74. The support portion 78 is fixed to the lower surface of the base portion 74. The support portion 78 is fixed to the lower surface of the base portion 74. The support portion 78 is disposed directly below the airbag 55. The support portion 78 receives the load when the airbag 55 is deployed. When the airbag 55 is not deployed, the lower surface of the support portion 78 may be in contact with the floor panel 12 or may be slightly spaced apart from the floor panel 12.

[0047] According to the submarine prevention mechanism 50B of the second embodiment, the floor panel 12 is supported by the support portion 78 when the airbag 55 is deployed, so that deformation of the base portion 74 can be suppressed even when the airbag 55 is deployed.

[0048] In a submarine prevention mechanism 50C according to a third embodiment shown in Figures 6A and 6B, an airbag 55 is attached to a submarine prevention member 52M. Specifically, the airbag 55 is fixed to the lower surface of the submarine prevention member 52M so that the bag portion 60 deploys downward. In order to stably fix the airbag 55 to the submarine prevention member 52M, the submarine prevention member 52M has a flat lower portion 53. The submarine prevention member 52M has the same configuration as the submarine prevention member 52 shown in Figure 4A etc., except for its cross-sectional shape.

[0049] 6B, when the inflator 62 is activated and the bag portion 60 is deployed downward, the bag portion 60 comes into contact with the base portion 74, and the housing 64 of the inflator 62 moves upward. Accordingly, the inflator 62 moves the submarine prevention member 52M upward. That is, when the airbag 55 is deployed, a deployment load is applied to the base portion 74, which is disposed below the submarine prevention member 52M, and the submarine prevention member 52M is pushed upward.

[0050] According to the submarine prevention mechanism 50C of the third aspect, the deployment load of the airbag 55 can be efficiently transmitted to the submarine prevention member 52M.

[0051] A submarine suppression mechanism 50D according to a fourth embodiment shown in Figures 7A to 8 is a modified example of the submarine suppression mechanism 50C according to the third embodiment shown in Figures 6A and 6B. As shown in Figure 7A, in the submarine suppression mechanism 50D according to the fourth embodiment, a base portion 74M has a support recess 80. The base portion 74M is obtained by adding the support recess 80 to the base portion 74 (Figures 6A and 6B) in the submarine suppression mechanism 50C according to the third embodiment.

[0052] The support recess 80 is a portion that receives the bag portion 60 when the bag portion 60 is deployed. The support recess 80 is a groove that recesses downward from the upper surface of the base portion 74M. As shown in FIG. 8, the support recess 80 is disposed directly below the airbag 55. The support recess 80 is provided in the center of the base portion 74M in the seat width direction (direction of arrow W).

[0053] As shown in Fig. 7B, when the inflator 62 is activated and the bag portion 60 is deployed downward, the submarine prevention member 52M is pushed upward, similar to the submarine prevention mechanism 50C according to the third embodiment shown in Fig. 6A etc. On the other hand, as shown in Fig. 7B, in the submarine prevention mechanism 50D according to the fourth embodiment, when the airbag 55 is deployed, the support recess 80 provided in the base portion 74M receives the bag portion 60.

[0054] According to the submarine prevention mechanism 50D of the fourth aspect, the deployment load of the airbag 55 can be received by the support recess 80 of the base portion 74M, and therefore the deployment force of the airbag 55 can be efficiently transmitted to the submarine prevention member 52M.

[0055] The following additional notes are further disclosed regarding the above embodiment.

[0056] (Appendix 1) The vehicle seat (10) of the present disclosure comprises a seat frame (32), a submarine regulating member (52) displaceable relative to the seat frame, and a movement mechanism (54) disposed below the submarine regulating member and capable of moving the submarine regulating member upward.

[0057] With this configuration, in the event of a vehicle collision, the submarine phenomenon can be suppressed with a simple configuration by moving the submarine prevention member upward using the movement mechanism.

[0058] (Supplementary Note 2) In the vehicle seat described in Supplementary Note 1, the movement mechanism may be an airbag (55).

[0059] With this configuration, a mechanism for instantly moving the submarine prevention member upward can be easily realized.

[0060] (Appendix 3) In the vehicle seat described in Appendix 1 or 2, the seat frame has a pair of side frames (36) arranged at a distance from each other in the seat width direction, and the submarine prevention member is inserted into a pair of guide holes (56) formed in the pair of side frames, and the submarine prevention member may be movable within the range of the pair of guide holes.

[0061] With this configuration, the guide hole can regulate the distance and direction of movement of the submarine regulating member.

[0062] (Appendix 4) In the vehicle seat described in Appendix 3, a movement restricting portion (58) that restricts upward movement of the submarine restricting member is provided on each edge (57) of the pair of guide holes, and the movement restricting portion may allow upward movement of the submarine restricting member when a load greater than a predetermined value is applied to the submarine restricting member.

[0063] With this configuration, the movement of the submarine restricting member can be restricted except when the movement mechanism is in operation.

[0064] (Appendix 5) In the vehicle seat described in Appendix 2, the seat frame may have a pair of side frames spaced apart from each other in the seat width direction, and a base portion (74) connected to the pair of side frames, and the airbag may be disposed on the base portion.

[0065] With this configuration, the airbag can be easily arranged in the vehicle seat.

[0066] (Supplementary Note 6) In the vehicle seat described in Supplementary Note 5, the airbag may be disposed at a position overlapping the submarine-preventing member when viewed in the vertical direction.

[0067] With this configuration, the deployment force of the airbag can be efficiently transmitted to the submarine prevention member.

[0068] (Supplementary Note 7) In the vehicle seat according to Supplementary Note 5 or 6, a support portion (78) for receiving a load when the airbag is deployed may be disposed below the base portion.

[0069] With this configuration, deformation of the base portion can be suppressed even when the airbag is deployed.

[0070] (Appendix 8) In the vehicle seat described in Appendix 2, the airbag may have a bag portion (60) that can be deployed by inflation, and the bag portion may have a recess (66) that engages with the submarine restraining member when the bag portion is deployed.

[0071] With this configuration, the deployment force of the airbag can be efficiently transmitted to the submarine prevention member when the airbag is deployed.

[0072] (Appendix 9) In the vehicle seat described in Appendix 2, the airbag may be attached to the submarine restriction member, and when the airbag deploys, a deployment load may be applied to a base portion located below the submarine restriction member, pushing the submarine restriction member upward.

[0073] With this configuration, the deployment load of the airbag can be efficiently transmitted to the submarine prevention member.

[0074] (Appendix 10) In the vehicle seat described in Appendix 9, the airbag may have a bag portion that can be deployed by inflation, and the base portion may have a support recess (80) that receives the bag portion when the bag portion is deployed.

[0075] With this configuration, the deployment load of the airbag can be received by the support recess of the base portion, so that the deployment force of the airbag can be efficiently transmitted to the submarine prevention member.

[0076] Although the present disclosure has been described in detail, the present disclosure is not limited to the individual embodiments described above. Various additions, substitutions, modifications, partial deletions, etc. are possible in these embodiments without departing from the gist of the present disclosure or the spirit of the present disclosure derived from the content of the claims and their equivalents. These embodiments can also be implemented in combination. For example, in the above-described embodiments, the order of each operation and the order of each process are shown as examples and are not limited to these. The same applies when numerical values ​​or mathematical expressions are used in the description of the above-described embodiments. [Explanation of symbols]

[0077] 10...Vehicle seat 32...Seat frame 36...Side frame 52, 52M...Submarine regulation parts 54...moving mechanism part 55...airbag 56...Guide hole 57...Edge 58...Movement restriction part 60...Bag part 66: Recess 74, 74M: Base 78...support portion 80...support recess

Claims

1. The seat frame and a submarine-restricting member displaceable relative to the seat frame; a movement mechanism portion disposed below the submarine prevention member and capable of moving the submarine prevention member upward.

2. The vehicle seat according to claim 1, The vehicle seat, wherein the movement mechanism is an airbag.

3. The vehicle seat according to claim 1 or 2, The seat frame has a pair of side frames arranged at an interval in the seat width direction, The submarine restriction member is inserted into a pair of guide holes formed in the pair of side frames, The submarine restricting member is movable within the range of the pair of guide holes.

4. The vehicle seat according to claim 3, A movement restricting portion that restricts upward movement of the submarine restricting member is provided on each edge of the pair of guide holes, The movement restricting portion allows the submarine restriction member to move upward when a load equal to or greater than a predetermined value acts on the submarine restriction member.

5. The vehicle seat according to claim 2, The seat frame is A pair of side frames arranged at an interval in the seat width direction; a base portion connected to the pair of side frames, The vehicle seat, wherein the airbag is disposed on the base portion.

6. The vehicle seat according to claim 5, The vehicle seat, wherein the airbag is disposed at a position overlapping the submarine restriction member when viewed in the vertical direction.

7. The vehicle seat according to claim 5 or 6, A support portion that receives the load when the airbag is deployed is disposed below the base portion.

8. The vehicle seat according to claim 2, The airbag has a bag portion that can be deployed by inflation, The vehicle seat, wherein the bag portion has a recess that engages with the submarine-control member when the bag portion is deployed.

9. The vehicle seat according to claim 2, The airbag is attached to the submarine restriction member, When the airbag is deployed, a deployment load acts on a base portion disposed below the submarine prevention member, pushing the submarine prevention member upward.

10. The vehicle seat according to claim 9, The airbag has a bag portion that can be deployed by inflation, The vehicle seat, wherein the base portion has a support recess that receives the bag portion when the bag portion is deployed.

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