Anti-submarine slip thigh airbag with a lacing

Abstract

A motor vehicle airbag system includes an automotive seat having a seat back rotatably connected to a seat base, the seat base being mounted on a seat frame. A seat base cushion is mounted on the seat frame, and a passenger sits on the seat base cushion. A thigh airbag is connected to the seat frame and is located above the seat frame and below the seat base cushion when not inflated. At least one airbag tie is connected to the seat frame and the thigh airbag. A waist belt is connected to the automotive seat and contacts the pelvis of the passenger. When inflated, the thigh airbag pushes the seat base cushion upward, forcing the pelvis of the passenger to rub against the waist belt upward, thereby reducing the phenomenon of the pelvis slipping under the waist belt.

Description

Technical Field

[0001] The present disclosure relates to a motor vehicle seat airbag system. Background Art

[0002] In known motor vehicle seat designs with a 3-point seat belt design, in an emergency operation using an existing or known 3-point belt design, a passenger in a reclined (-45 degrees) position or an upright position may "submarine" or slide under a seat belt (such as a lap belt).

[0003] Existing alternative systems include anti-submarine bars or brackets that limit the submarine movement of the passenger. However, such anti-submarine bars or brackets may affect the comfort of the passenger. Other known alternative systems include adding an airbag under the thighs on the upper surface of the seat base, which, when inflated, reduces the gap between the lap belt and the upper surface of the seat base and increases the angle of the seat cushion, thereby limiting the space for submarining to occur. However, such a thigh airbag may rock or roll forward under the frictional force of the passenger's forward acceleration, thereby increasing the gap between the lap belt and the upper surface of the seat base and potentially reducing the effectiveness of the under-thigh airbag.

[0004] Therefore, while current vehicle seat restraint and airbag systems achieve their intended purposes, there is still a need for a new and improved vehicle seat under-thigh airbag system. Summary of the Invention

[0005] According to several aspects, a motor vehicle airbag system includes a motor vehicle seat having a seat base mounted on a seat frame. A seat base cushion is mounted on the seat frame, and a passenger sits on the seat base cushion. A thigh airbag is connected to the seat frame and, in an uninflated condition, is located above the seat frame and below the seat base cushion. At least one airbag tie is connected to the seat frame and the thigh airbag. During inflation of the thigh airbag, at least one airbag tie restricts the forward movement of the thigh airbag, thereby allowing the thigh airbag to raise the seat base cushion in an inflated state, thereby raising the pelvis of the passenger.

[0006] In another aspect of the present disclosure, the seat frame includes a frame crossbar oriented in a cross-vehicle direction.

[0007] In another aspect of the present disclosure, a first end of at least one airbag tie is connected to the frame crossbar, and a second end of at least one airbag tie is connected to the thigh airbag.

[0008] In another aspect of the present disclosure, the thigh airbag is located above the seat frame and above a plurality of seat support members that define at least a plurality of seat springs.

[0009] In another aspect of the present disclosure, a seat belt is connected to an automotive seat and contacts the pelvis of a passenger. When inflated, the thigh airbag pushes the seat base cushion upward, forcing the passenger's pelvis to rub against the seat belt upward, thereby reducing the slippage of the pelvis under the seat belt.

[0010] In another aspect of the present disclosure, at least one airbag lacing includes four lacings, each of which includes a rear connection point adapted to secure the at least one airbag lacing to a frame crossbar.

[0011] In another aspect of the present disclosure, at least one airbag lacing overlaps the upper surface of the thigh airbag and is secured to the forward face of the thigh airbag.

[0012] In another aspect of the present disclosure, at least one airbag lacing includes a low point midsection between the rear connection point of the at least one airbag lacing and the upper surface overlap portion, the rear connection point being adapted to secure the at least one airbag lacing to a frame crossbar; and the upper surface overlap portion directly contacts the upward surface of the thigh airbag in the inflated state.

[0013] In another aspect of the present disclosure, the lacing tensioning device applies a high - speed tensioning force in a rearward direction opposite to the forward component of the displacement of the thigh airbag during inflation.

[0014] In another aspect of the present disclosure, when the thigh airbag inflates, the lacing tensioning device is activated simultaneously to increase the tension force on the airbag lacing, thereby pulling the airbag lacing upward against the seat base cushion more quickly and increasing the seat cushion support.

[0015] According to several aspects, a motor vehicle airbag system includes an automotive seat having a seat back rotatably connected to a seat base, the seat base being mounted on a seat frame. A seat base cushion is mounted on the seat frame and a passenger sits on the seat base cushion. A thigh airbag is connected to the seat frame and is located above the seat frame and below the seat base cushion when not inflated. At least one airbag lacing is connected to the seat frame and the thigh airbag. A seat belt is connected to the automotive seat and contacts the pelvis of the passenger. After inflation, the thigh airbag helps to support the seat base cushion, prevents the passenger's pelvis from shifting downward, and allows the passenger to rub against the seat belt, thereby reducing the slippage of the pelvis under the seat belt.

[0016] In another aspect of the present disclosure, during inflation of the thigh airbag, at least one airbag lacing restricts the forward movement of the thigh airbag.

[0017] In another aspect of the present disclosure, the pelvis of the passenger is located behind the thigh airbag, and the lower surface of the passenger's thigh directly contacts and is supported by the seat base cushion.

[0018] In another aspect of the present disclosure, at least one tie defines a plurality of airbag ties individually secured to the rear-facing surface of the thigh airbag.

[0019] In another aspect of the present disclosure, at least one airbag tie is connected to the thigh airbag using a stitching seam.

[0020] In another aspect of the present disclosure, at least one airbag tie includes an upper surface overlapping portion that overlaps with the upper surface of the thigh airbag, and a stitching seam secured to the front-facing surface of the thigh airbag.

[0021] In another aspect of the present disclosure, when the thigh airbag inflates, the upper surface overlapping portion is simultaneously pulled upward and forward in the airbag displacement direction. The airbag displacement direction includes a forward displacement component and an upward displacement component. When the thigh airbag inflates, the upward displacement component causes the low point middle section of at least one airbag tie to displace upward, thereby pulling at least one airbag tie forward, straightening at least one airbag tie, and preventing the thigh airbag from rolling forward during inflation.

[0022] According to several aspects, a method for reducing the submarining movement of a passenger on a motor vehicle seat includes mounting a seat base cushion on a seat frame, with the passenger sitting on the seat base cushion; connecting a thigh airbag to the seat frame and positioning the thigh airbag above the seat frame and below the seat base cushion in a non-inflated state of the thigh airbag; securing at least one airbag tie to the seat frame and the thigh airbag to limit the forward displacement of the thigh airbag; connecting a waist belt to the vehicle seat to contact the pelvis of the passenger; and inflating the thigh airbag to push the seat base cushion upward, thereby forcing the thigh of the passenger to rub against the waist belt upward to reduce the submarining of the pelvis under the waist belt.

[0023] In another aspect of the present disclosure, the method further includes creating a low point middle section between a rear connection point of at least one airbag tie connected to the seat frame and the upper surface overlapping portion of at least one airbag tie, the upper surface overlapping portion directly contacting the upward surface of the thigh airbag in an inflated state.

[0024] In another aspect of the present disclosure, the method further includes applying a tie tension force from a tie tensioning device to at least one airbag tie, the direction of action being opposite to the forward displacement portion of the thigh airbag during inflation.

[0025] Further applicable fields will become apparent from the description provided herein. It should be understood that the description and specific examples are for illustrative purposes only and are not intended to limit the scope of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure in any way.

[0027] Figure 1 is a left front perspective view looking rearward of a motor vehicle seat having a thigh airbag system for a motor vehicle seat, according to an exemplary aspect.

[0028] Figure 2 is Figure 1 a left front perspective view of the mid-thigh airbag and airbag tether;

[0029] Figure 3 is Figure 1 a graph of the passenger pelvis rotation over time for the system;

[0030] Figure 4 is a left side elevation view of a passenger sitting on Figure 1 the motor vehicle seat of, wherein the thigh airbag is in a non-inflated state;

[0031] Figure 5 is Figure 1 a side elevation view of the non-inflated thigh airbag and tether assembly for the system;

[0032] Figure 6 is a left side elevation view of a passenger sitting on a motor vehicle seat improved by Figure 4 wherein the thigh airbag is in an inflated state;

[0033] Figure 7 is a left front perspective view of the thigh airbag and airbag tether of another aspect of the present disclosure, wherein the thigh airbag is in an inflated state;

[0034] Figure 8 is Figure 7 a side elevation view of the thigh airbag and airbag tether in a non-inflated state of the airbag;

[0035] Figure 9 is a left front perspective view of the thigh airbag without an airbag tether of another aspect of the present disclosure, wherein the thigh airbag is in an inflated state;

[0036] Figure 10 is Figure 9 a side elevation view of the thigh airbag in a non-inflated state of the airbag; and

[0037] Figure 11 is a partial side elevation cross-sectional view comparing a passenger on a motor vehicle seat having a thigh airbag system for a motor vehicle seat of the present disclosure and a motor vehicle seat without a thigh airbag system for a motor vehicle seat of the present disclosure. Detailed Description

[0038] The following description is merely exemplary in nature and is not intended to limit the present disclosure, application, or use.

[0039] Reference Figure 1 , an automotive seat thigh airbag system 10 is provided for a motor vehicle seat 12 having a seat back 14 that rotates between a plurality of upright positions during normal driving relative to a hinge 16 and can be rotated rearwardly to the shown passenger reclined position, which can range from the upright position to greater than 45 degrees from the vertical orientation, and, for example, can be oriented approximately 45 degrees rearwardly for the passenger reclined position. The seat back 14 is rotatably connected to a seat base 18 and is mounted on a seat frame 20. The seat base 18 can be adjusted forward or backward by a passenger for comfort. According to several aspects, an inflatable cushion or thigh airbag 22' indicated by an apostrophe to identify the inflated state of the airbag is mounted on the seat frame 20 and is positioned above the seat frame 20, which includes seat support members (such as seat springs) and is positioned below a seat base cushion 24 on which a passenger is seated.

[0040] As Figure 4 shown, a passenger typically accelerates in the forward direction 23 from a seated position on the seat base cushion 24. This forward acceleration of the passenger is resisted by contact of the passenger's pelvis with a seat belt 86 shown and described in reference Figure 6 . Contact with the seat belt can cause rotation of the passenger's pelvis, which can manifest as part of a rotational acceleration acting below the seat belt, resulting in "submarining" or sliding of the passenger's pelvis and thighs under the seat belt, as shown in reference Figure 6 , which is part of a typical three-point seat belt system provided with a motor vehicle seat 12. To limit this forward and downward sliding movement and mitigate submarining, the thigh airbag 22' is inflated by a signal received from a sensor 25, which can also provide activation signals for other vehicle airbags (not shown), including dashboard, side curtain, and steering wheel airbags. After inflation, the thigh airbag 22' pushes the seat base cushion 24 upward, forcing the passenger's thighs and pelvis to rub against the seat belt upward, thereby mitigating submarining of the passenger's pelvis under the seat belt.

[0041] To further increase resistance to submarining, the thigh airbag 22' has at least one, and according to several aspects, approximately four airbag ties 26. The airbag ties 26, for example, are fixed at a first end of the airbag ties 26 to a frame crossbar 28 of the seat frame 20 oriented in the cross-vehicle direction by a tie loop or mechanical connector and are fixed at a second end of the airbag ties 26 to an airbag surface 30. The thigh airbag 22' is typically as shown in reference Figure 5is deflated and supported on the seat frame 20, above the seat cushion support member 78 (including the seat springs shown and described with reference to Figure 4 the seat springs shown and described), below the thigh airbag 22' and in contact with the lower surface of the thigh airbag 22'.

[0042] Reference Figure 2 and again reference Figure 1 , for clarity, the inflated thigh airbag 22' is shown in a fully inflated state. According to several aspects, the airbag tie 26 can define four separate airbag ties that are identical to each other and include a first tie 32, a second tie 34, a third tie 36, and a fourth tie 38. The separate airbag ties in the airbag tie 26 include a low point midsection 40, between a rear connection point 42 adapted to secure the connection point to the frame crossbar 28 and an upper surface overlap portion 44 that directly contacts the upward surface 46 of the thigh airbag 22' in the inflated state. In the fully inflated state of the shown thigh airbag 22, the low point midsection 40 is shown as the downwardly curved portion of the airbag tie 26. According to several aspects, the forward connection point 48 of the airbag tie 26 can be secured (such as, by a stitching seam) to the forward face 50 of the airbag surface 30.

[0043] According to several aspects, when the thigh airbag 22' inflates, the upper surface overlap portion 44 is simultaneously pulled upward and forward in the airbag displacement direction 52. The airbag displacement direction 52 includes a forward displacement component 54 and an upward displacement component 56. Thus, the airbag displacement direction 52 partially causes an upward displacement component of the low point midsection 40 of the airbag tie 26. When the thigh airbag 22' inflates, the airbag tie 26 is pulled forward, thereby straightening the airbag tie 26 and preventing the inflated thigh airbag 22' from rolling forward. This combination helps to reduce the rotation of the pelvis, vertically support the pelvis, and minimize the forward offset of the passenger during a collision event.

[0044] Reference Figure 3 and again reference Figure 1 and Figure 2, Chart 58 presents comparative passenger pelvic angle rotation values 60 in milliseconds (ms) compared to time 62. For motor vehicles with the airbag lanyard 26 of the present disclosure and motor vehicles without the airbag lanyard 26. The first curve 64 presents the passenger pelvic rotation values during a rapid deceleration event in a motor vehicle without the airbag lanyard 26. The second curve 66 presents the passenger pelvic rotation values during a rapid deceleration event in a motor vehicle including the airbag lanyard 26. The first pelvic rotation peak 68 is approximately 16 degrees and occurs at approximately 95 milliseconds after the start of the deceleration event starting from zero milliseconds. The second pelvic rotation peak value is approximately 9 degrees and occurs at approximately 90 milliseconds after the start of the deceleration event. From this exemplary data, the airbag lanyard 26 of the present disclosure can effectively reduce the overall maximum pelvic rotation peak value, and can also provide the maximum reduced maximum pelvic rotation peak value earlier than a system without the airbag lanyard 26.

[0045] Reference Figure 4 And again reference Figure 1 And Figure 2 , the passenger 72 is shown sitting in the reclined position of the seat back 14 of the motor vehicle seat 12. The passenger 72 is in direct contact with the seat back cushion 74 and the seat base cushion 24. In the reclined position, the lower pelvis 76 of the passenger 72 contacts the seat base cushion 24 and causes the seat base cushion 24 to deflect downward. The thigh airbag 22 is in a non-inflated state and is supported on a seat base support member 78 (including a seat spring and a seat spring support structure) connected to a movable part of the seat frame 20. The lower surface 80 of the thigh 82 of the passenger 72 is in direct contact with the seat base cushion 24 and is supported by the seat base cushion 24.

[0046] Reference Figure 5 And again reference Figure 4 , the thigh airbag 22 in the non-inflated state does not exert a force on the airbag lanyard 26 along the airbag displacement direction 52. Therefore, when the thigh airbag 22 is in the non-inflated state, the concave surface 84 of the airbag lanyard 26 can directly contact the lower surface of the seat base cushion 24. However, the airbag lanyard 26 does not exert a force on the seat base cushion in the upward displacement component 56.

[0047] Reference Figure 6 And again reference Figures 4 to 5, the passenger 72 is typically held in the seat back rest position by using a three - point seat belt assembly having a lap belt 86 positioned at the passenger's 72 hips and a shoulder belt 88 acting on the upper torso of the passenger 72. When the thigh airbag 22' inflates to the inflated state shown, the thigh airbag 22' pulls on the airbag tie 26 in the airbag displacement direction 52. Thereby, an upward displacement component 56 acts on the airbag tie to pull the airbag tie 26 upward. The upward force 90 from the upward displacement component 56 of the airbag tie 26 pushes the seat base cushion 24 upward and also causes the thighs 82 and the pelvis 76 to rotate about a rotation arc 92, resulting in an upward displacement of the passenger's 72 thighs 82 and a small vertical displacement component of the pelvis 76. The inflated thigh airbag 22' located in front of the lower pelvis 76 of the passenger 72 and the upward displacement of the seat base cushion 24 together minimize the available space for the lower pelvis 76 to slide under the lap belt 86.

[0048] According to other aspects, any of the motor vehicle seat thigh airbag systems of the present disclosure may further include a tie tensioning device 94. The tie tensioning device 94 may define a mechanical device such as a motor or a pyrotechnic device that is capable of applying a tensioning force at high speed in a backward direction opposite to the forward displacement component 54 described in reference Figure 2 . When the thigh airbag 22' inflates, the tie tensioning device 94 is activated simultaneously to add an additional tensioning force to the airbag tie 26, thereby pulling the airbag tie 26 upward more rapidly against the seat base cushion 24. According to several aspects, the tie tensioning device 94 may use the same signal from the sensor 25 to activate the thigh airbag 22.

[0049] Reference Figure 7 And referring again to Figure 1 , Figure 2 And Figure 5 , according to other aspects, the motor vehicle seat thigh airbag system 96 is modified from the motor vehicle seat thigh airbag system 10 as follows. The motor vehicle seat thigh airbag system 96 includes a thigh airbag 98', again denoted with an apostrophe to indicate the airbag is in the inflated state. At least one and according to several aspects a plurality of airbag ties 100, which are similar to the single or multiple airbag ties 26, are individually fixed to the rearward face 102 of the thigh airbag 98' and thus do not contact or overlap the upper surface 104 of the thigh airbag 98'. The position of the thigh airbag 98' is the same as that of the thigh airbag 22', and when inflated and pulling the airbag ties 100 upward, the thigh airbag 98' functions similarly to the thigh airbag 22' in other aspects, as described in reference Figures 1 to 6 .

[0050] Reference Figure 8 And referring again to Figure 1 、 Figure 2 、 Figure 5 and Figure 7 ,the thigh airbag 98 is shown in a non-inflated state, which provides a downwardly curved shape of the airbag tether 100, thereby providing a concave surface 106 of the airbag tether 100, similar to the concave surface 84 of the airbag tether 26 when the thigh airbag 22 is in a non-inflated state. When the thigh airbag 98 inflates to the inflated state as shown in Figure 7 , the thigh airbag 98 pulls the airbag tether 100 in the airbag displacement direction 52. Thereby, an upward displacement component 56 acts on the airbag tether 100 to pull the airbag tether 100 upward. The total tension force acting on the airbag tether 100 can be less than the total tension force acting on the airbag tether 26 because the airbag tethers 26 also receive additional rotational displacement forces due to their attachment at the forward face 50 of the airbag surface 30, such that the thigh airbag 22' exerts an additional rotational force from its inflation, thus enhancing the tension force acting on the airbag tethers 26 compared to the airbag tether 100.

[0051] Reference Figure 9 And referring again to Figures 1 to 8 , according to other aspects, the vehicle seat thigh airbag system 108 is modified from the vehicle seat thigh airbag system 10 and the vehicle seat thigh airbag system 96 as follows. The vehicle seat thigh airbag system 108 includes a thigh airbag 110', again denoted with an apostrophe to indicate the airbag is in an inflated state. The thigh airbag 110' does not include an airbag tether but is positioned to maximize the upward displacement component 56 (not shown in this view) of the seat base cushion 24.

[0052] Reference Figure 10 And referring again to Figures 1 to 9 , according to other aspects, the vehicle seat thigh airbag system 112 is modified from the vehicle seat thigh airbag system 10, the vehicle seat thigh airbag system 96, and the vehicle seat thigh airbag system 108. The vehicle seat thigh airbag system 112 includes a thigh airbag 114 shown in a non-inflated state, which includes a single airbag tether 116. The width of the single airbag tether 116 extends substantially across the entire width of the thigh airbag 114 and is attached to the rear surface 118 of the thigh airbag 114. According to other aspects in lieu of attachment at the rear surface 118, the single airbag tether 116 can also overlap the upper surface 120 of the thigh airbag 114 and be fixedly attached along the front surface 122 of the thigh airbag 114, similar to reference Figure 2The connecting device of the described airbag tie 26, thus, the function of a single airbag tie 116 is similar to that of the airbag tie 26.

[0053] Reference Figure 11 And referring again to Figures 4 to 5 , the motor vehicle seat thigh airbag system of the present disclosure, similar to the motor vehicle seat thigh airbag system 10, allows for reduced passenger displacement due to the submarining effect. In the reclined position, the lower pelvis 76 of the passenger 72 to whom the motor vehicle seat thigh airbag system of the present disclosure is applied is forced to be lifted to an elevation difference 126 that is higher than the position of the lower pelvis 124 of the passenger 72' when the motor vehicle seat thigh airbag system of the present disclosure is not employed. The elevation difference 126 helps to reduce the submarining of the passenger below the seat belt 86 described in the reference Figure 6 .

[0054] Furthermore, in the reclined position, the lower pelvis 76 of the passenger 72 to whom the motor vehicle seat thigh airbag system of the present disclosure is applied remains closer to the initial position of the pelvis prior to a deceleration event. When the motor vehicle seat thigh airbag system of the present disclosure is employed, a forward displacement difference 128 occurs between the position of the lower pelvis 76 of the passenger 72 and the position of the lower pelvis 124 of the passenger 72' when the motor vehicle seat thigh airbag system of the present disclosure is not employed. The forward displacement difference 128 when the motor vehicle seat thigh airbag system of the present disclosure is not employed may contribute to the submarining of the passenger 72'.

[0055] The motor vehicle seat thigh airbag system of the present disclosure has several advantages. These advantages include utilizing the force of the thigh airbag during inflation to eliminate slack and pull forward an external tie fixed to the seat frame, thereby restricting the forward roll of the thigh airbag. This minimizes excessive rotation of the passenger's pelvis while vertically supporting the passenger's pelvis and reducing the forward movement of the passenger and the thigh airbag during a vehicle frontal collision. The motor vehicle seat thigh airbag system of the present disclosure does not rely on the seat track angle to be effective and can be used at a zero track angle. Compared to other conventional anti-submarining methods such as anti-submarining brackets or bars, the system of the present disclosure provides improved comfort. The external airbag tie is fixed to the seat frame; when the thigh airbag deploys, the external airbag tie is straightened in the front-to-back direction, thereby preventing the forward roll of the thigh airbag while vertically supporting the passenger's pelvis.

[0056] The description of the present disclosure is merely exemplary in nature, and variations that do not depart from the gist of the present disclosure are intended to fall within the scope of the present disclosure. Such variations should not be regarded as departing from the scheme and scope of the present disclosure.

Claims

1. A motor vehicle airbag system, comprising: An automotive seat having a seat base mounted on a seat frame; A seat base cushion mounted on the seat frame, on which a passenger sits; A thigh airbag connected to the seat frame and located above the seat frame and below the seat base cushion in a non-inflated state of the thigh airbag; and At least one airbag tie connected to the seat frame and the thigh airbag; Wherein, during inflation of the thigh airbag, the at least one airbag tie restricts forward movement of the thigh airbag, thereby allowing the thigh airbag to lift the seat base cushion in an inflated state, thereby lifting the thigh and pelvis of the passenger; Wherein the seat frame includes a frame crossbar oriented in a cross-vehicle direction; and Wherein a first end of the at least one airbag tie is connected to the frame crossbar, and a second end of the at least one airbag tie is connected to the thigh airbag.

2. The system according to claim 1, wherein The thigh airbag is located above the seat frame and above a plurality of seat support members defining at least a plurality of seat springs.

3. The system according to claim 1, further comprising a waist belt connected to the vehicle seat and contacting the pelvis of the passenger, wherein, After inflation, the thigh airbag pushes the seat base cushion upward, forcing the pelvis of the passenger to rub against the seat belt upward, thereby reducing the slippage of the pelvis under the seat belt.

4. The system according to claim 1, wherein The at least one airbag tie includes four ties, and the four ties respectively include rear connection points adapted to fix the at least one airbag tie to the frame crossbar.

5. The system according to claim 1, wherein The at least one airbag tie overlaps on the upper surface of the thigh airbag and is fixed to the forward face of the thigh airbag.

6. The system according to claim 1, wherein, The at least one airbag tie includes a low point mid-section located between the rear connection point of the at least one airbag tie and the upper surface overlapping portion, the rear connection point being adapted to fix the at least one airbag tie to the frame crossbar, and the upper surface overlapping portion directly contacts the upward surface of the thigh airbag in an inflated state.

7. The system according to claim 1, further comprising a tie tensioning device that applies a tensioning force in a rearward direction opposite to the forward displacement component of the thigh airbag during inflation of the thigh airbag.

8. The system according to claim 7, wherein When the thigh airbag inflates, the tie tensioning device is activated simultaneously to increase the tensioning force on the at least one airbag tie, thereby more quickly pulling the at least one airbag tie upward against the seat base cushion.

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