Anti-slip seat cushion for vehicles made of anisotropic material

Abstract

The invention relates to a submarine prevention seat cushion for a vehicle comprised of an anisotropic material. The submarine prevention seat cushion for a vehicle comprises a body comprised of an anisotropic material. The anisotropic material comprises a primary material having a primary stiffness and a plurality of inserts dispersed throughout the primary material. In response to the body of the submarine prevention seat cushion being subjected to a submarine load, the plurality of inserts exert an axial compression force, wherein the axial compression force is exerted in a direction opposite the submarine load to increase a total stiffness of the body in a direction aligned with the submarine load.

Description

Technical Field

[0001] This disclosure relates to an anti-slip seat cushion for vehicles, wherein the seat cushion is made of an anisotropic material. More specifically, the anisotropic material consists of a main material and a plurality of inserts dispersed throughout the main material. Background Technology

[0002] Vehicle seats generally consist of a seat cushion and a seat back. If the vehicle seat is in a tilted position during the sudden deceleration experienced during a vehicle collision, the lower part of the occupant's body may be pushed deep into the seat cushion and slide under the occupant's lap belt; this is known as subsidence. Sleep and relaxation seats include seat backs that can tilt at relatively large angles of 45 degrees or greater. It has been found that relatively large tilt angles in sleep and relaxation seats increase the likelihood of occupant subsidence during sudden deceleration of the vehicle.

[0003] There are currently several methods available to reduce the likelihood of occupants skidding forward. For example, thigh airbags or specially designed contour features can be introduced to reduce skidding; however, these methods increase cost and complexity or reduce occupant comfort. In fact, simply increasing the stiffness of the seat cushion material to slow down skidding can lead to reduced occupant comfort.

[0004] Therefore, while current vehicle seats have achieved their intended purpose, there is still a need in the art for an improved, cost-effective method to provide anti-slip seat cushions without compromising occupant comfort. Summary of the Invention

[0005] According to several aspects, an anti-slip seat cushion for vehicles is disclosed. The anti-slip seat cushion includes a body made of an anisotropic material. The anisotropic material includes a main material having a principal stiffness and a plurality of inserts dispersed throughout the main material. In response to the body of the anti-slip seat cushion experiencing a slip load, the plurality of inserts apply an axial compressive force, wherein the axial compressive force is applied in a direction opposite to the slip load to increase the overall stiffness of the body in a direction aligned with the slip load.

[0006] In one aspect, the plurality of inserts are oriented with a principal angle, wherein the principal angle varies between each insert based on the local size and local orientation of the slip load.

[0007] On the other hand, in response to the vertical load being applied to the anti-submarine pad, the plurality of inserts are pushed into a deformation primarily of bending.

[0008] On the other hand, when the axial compressive force is applied, the total stiffness of the body is greater than the principal stiffness of the main material.

[0009] In one aspect, when a vertical load is applied to the upper surface of the anti-slip seat, the principal stiffness of the main material is substantially unaffected, and wherein the vertical load is applied by an occupant sitting on the anti-slip seat.

[0010] On the other hand, the orientation, density, and material of each of the plurality of inserts vary throughout the main material of the anti-slip seat pad based on the local size and local orientation of the slip load.

[0011] On the other hand, the plurality of inserts are made of a foam material having an elastic storage modulus that is at least 25 percent greater than that of the main material.

[0012] On the other hand, the principal stiffness is selected based on occupant comfort.

[0013] In one respect, in response to a vertical load being applied to the anti-submarine seat, the anisotropic material exhibits the principal stiffness.

[0014] In one aspect, a vehicle seat assembly includes a seat plate and an anti-slip seat cushion supported by the seat plate. The anti-slip seat cushion includes a body made of an anisotropic material. The anisotropic material includes a primary material having a principal stiffness and a plurality of inserts dispersed throughout the primary material. The plurality of inserts are oriented at a principal angle to apply an axial compressive force in response to the body of the anti-slip seat cushion experiencing a slip load, wherein the axial compressive force is applied in a direction opposite to the slip load to increase the overall stiffness of the body in a direction aligned with the slip load.

[0015] In one aspect, the plurality of inserts are oriented with a principal angle, wherein the principal angle varies between each insert based on the local size and local orientation of the slip load.

[0016] On the other hand, in response to the vertical load being applied to the anti-submarine pad, the plurality of inserts are pushed into a deformation primarily of bending.

[0017] On the other hand, when the axial compressive force is applied, the total stiffness of the body is greater than the principal stiffness of the main material.

[0018] On the other hand, when a vertical load is applied to the upper surface of the anti-slip seat, the principal stiffness of the main material is substantially unaffected, and the vertical load is applied by the occupant sitting on the anti-slip seat.

[0019] In one aspect, the orientation, density, and material of each of the plurality of inserts vary throughout the main material of the anti-slip seat pad based on the local size and local orientation of the slip load.

[0020] On the other hand, the plurality of inserts are made of a foam material having an elastic storage modulus that is at least 25 percent greater than that of the main material.

[0021] On the other hand, the vehicle seat assembly is either a sleeping seat or a relaxation seat.

[0022] In one aspect, an anti-slip seat cushion for a vehicle is disclosed, the anti-slip seat cushion comprising a body made of a primary material having primary stiffness and a secondary material having secondary stiffness, wherein the elastic storage modulus of the secondary material is at least 25 percent greater than the elastic storage modulus of the primary material, and a region of the body is made of the secondary material and shaped to conform to the pelvic and upper thigh region of an occupant.

[0023] On the other hand, the region is shaped to include a profile oriented in a lateral direction across the anti-slip seat, wherein the profile includes a peak portion arranged between two valleys.

[0024] On the other hand, the two valleys correspond to the occupant's thighs, and the peaks partially correspond to the area where the occupant's thighs are separated.

[0025] 1. An anti-submarine-slip seat cushion for a vehicle, the anti-submarine-slip seat cushion comprising: A main body made of anisotropic material, wherein the anisotropic material includes: Including the main materials for principal stiffness; and Multiple inserts are distributed throughout the main material, wherein, in response to the body of the anti-slip seat experiencing a slip load, the multiple inserts apply an axial compressive force, wherein the axial compressive force is applied in the opposite direction to the slip load to increase the overall stiffness of the body in the direction aligned with the slip load.

[0026] 2. The anti-slip seat cushion according to Scheme 1, wherein the plurality of inserts are oriented at a principal angle, and wherein the principal angle varies between each insert based on the local size and local direction of the slip load.

[0027] 3. The anti-submarine seat pad according to Scheme 1, wherein, in response to a vertical load being applied to the anti-submarine seat pad, the plurality of inserts are pushed into a predominantly bending deformation.

[0028] 4. The anti-slip seat pad according to Scheme 1, wherein when the axial compressive force is applied, the total stiffness of the main body is greater than the principal stiffness of the main material.

[0029] 5. The anti-slip seat cushion according to claim 4, wherein the principal stiffness of the main material is substantially unaffected when a vertical load is applied to the upper surface of the anti-slip seat cushion, and wherein the vertical load is applied by an occupant sitting on the anti-slip seat cushion.

[0030] 6. The anti-slip seat pad according to claim 1, wherein the orientation, density, shape and material of each of the plurality of inserts vary throughout the main material of the anti-slip seat pad based on the local size and local orientation of the slip load.

[0031] 7. The anti-slip seat cushion according to Scheme 1, wherein the plurality of inserts are made of foam material having an elastic storage modulus that is at least 25 percent greater than that of the main material.

[0032] 8. The anti-slip seat cushion according to Scheme 1, wherein the primary stiffness is selected based on occupant comfort.

[0033] 9. The anti-slip seat pad according to claim 1, wherein the anisotropic material exhibits the principal stiffness in response to a vertical load being applied to the anti-slip seat pad.

[0034] 10. A vehicle seat assembly, comprising: Seat plate; An anti-slip seat cushion supported by the seat plate, wherein the anti-slip seat cushion comprises: A main body made of anisotropic material, wherein the anisotropic material includes: Including the main materials for principal stiffness; and Multiple inserts are distributed throughout the main material, wherein, in response to the body of the anti-slip seat experiencing a slip load, the multiple inserts are oriented to apply an axial compressive force, and wherein the axial compressive force is applied in the opposite direction to the slip load to increase the overall stiffness of the body in the direction aligned with the slip load.

[0035] 11. The vehicle seat assembly according to claim 10, wherein the plurality of inserts are oriented at a principal angle, and wherein the principal angle varies between each insert based on the local size and local direction of the slip load.

[0036] 12. The anti-submarine seat pad according to claim 10, wherein, in response to a vertical load being applied to the anti-submarine seat pad, the plurality of inserts are pushed into a predominantly bending deformation.

[0037] 13. The vehicle seat assembly according to claim 10, wherein when the axial compressive force is applied, the total stiffness of the body is greater than the principal stiffness of the main material.

[0038] 14. The vehicle seat assembly according to claim 13, wherein the principal stiffness of the main material is substantially unaffected when a vertical load is applied to the upper surface of the anti-slip seat cushion, and wherein the vertical load is applied by an occupant sitting on the anti-slip seat cushion.

[0039] 15. The vehicle seat assembly according to claim 10, wherein the orientation, density, and material of each of the plurality of inserts vary throughout the main material of the anti-slip seat cushion based on the local size and local orientation of the lurch load.

[0040] 16. The vehicle seat assembly according to claim 10, wherein the plurality of inserts are made of a foam material having an elastic storage modulus at least 25 percent greater than that of the main material.

[0041] 17. The vehicle seat assembly according to claim 12, wherein the vehicle seat assembly is one of a sleeping seat and a relaxation seat.

[0042] 18. An anti-submarine seat cushion for a vehicle, the anti-submarine seat cushion comprising: A body is composed of a primary material having primary stiffness and a secondary material having secondary stiffness, wherein the elastic storage modulus of the secondary material is at least 25 percent greater than that of the primary material, and a region of the body is composed of the secondary material and is shaped to conform to the pelvis and upper thigh region of an occupant, and the region of the body is composed of the secondary material and is shaped to abut against the pelvis when the vehicle undergoes sudden deceleration.

[0043] 19. The anti-slip seat according to claim 18, wherein the region is shaped to include a profile oriented in a lateral direction across the anti-slip seat, and wherein the profile includes a peak portion arranged between two valleys.

[0044] 20. The anti-slip seat cushion according to claim 19, wherein the two valleys conform to the occupant's thighs, and the peak portion conforms to the area where the occupant's thighs are separated.

[0045] Further applications will become apparent from the description provided herein. It should be understood that the descriptions and specific examples are for illustrative purposes only and are not intended to limit the scope of this disclosure. Attached Figure Description

[0046] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this disclosure in any way.

[0047] Figure 1 This is a perspective view of a vehicle seat assembly including a disclosed anti-slip seat cushion in a vehicle, according to an exemplary embodiment; Figure 2 It is cut along section line AA according to an exemplary embodiment. Figure 1 The cross-sectional view of the anti-slip seat pad shown; Figure 3A This is an enlarged view of the anisotropic material of the anti-slip seat pad when a vertical load is applied to it, according to an exemplary embodiment. Figure 3B This is an enlarged view of the anisotropic material of the anti-slip seat pad when a slip load is applied to it, according to an exemplary embodiment. Figure 4 This is according to an exemplary embodiment. Figure 3A and Figure 3B Alternative embodiments of the anisotropic materials shown; Figure 5A This is a front view of another embodiment of the anti-slip seat cushion according to an exemplary embodiment; Figure 5B According to an exemplary embodiment, along Figure 5A The cross-sectional view of the anti-slip seat pad is shown by section line BB. Figure 5C According to an exemplary embodiment, along Figure 5B The cross-sectional view of the anti-slip seat pad is shown by section line CC. Figure 5D According to an exemplary embodiment, along Figure 5B The cross-sectional view of the anti-slip seat pad shown is taken by section line DD; and Figure 5E According to an exemplary embodiment, along Figure 5B The cross-sectional view of the anti-slip seat pad is shown by section line EE. Detailed Implementation

[0048] The following description is exemplary in nature and is not intended to limit this disclosure, its application or use.

[0049] refer to Figure 1An exemplary vehicle seat assembly 10 is shown arranged within the interior compartment 14 of a vehicle 12. The vehicle 12 can be any type of vehicle, such as, but not limited to, a sedan, truck, SUV, van, or motorhome. In embodiments, the vehicle 12 can also be an aircraft or marine vehicle. The vehicle seat assembly 10 includes a seat back 16 and a lower seat assembly 18. The lower seat assembly 18 includes a seat plate 20 and an anti-submarine slip cushion 22, wherein the anti-submarine slip cushion 22 is supported by the seat plate 20. The seat plate 20 is operatively attached to the floor 24 of the vehicle 12 using any type of structure 26. Figure 1 In the example shown, structure 26 is a pair of seat tracks. Anti-slip seat cushion 22 defines an upper surface 30 and a lower surface 32. In a non-limiting embodiment, vehicle seat assembly 10 is a sleeping seat or a relaxation seat.

[0050] Figure 2 It was cut along section line AA. Figure 1 The cross-sectional view of the anti-slip seat pad 22 shown is illustrated. (Reference) Figure 1 and Figure 2 Both, the anti-slip seat cushion 22 includes a main body 36 made of anisotropic material 38. Although Figure 2 The entire body 36 of the anti-slip seat pad 22 is shown to be made of anisotropic material 38, but it should be understood that... Figure 2 This is merely exemplary in nature, and in embodiments, only a portion or specific area of ​​the body 36 of the anti-slip seat cushion 22 may include anisotropic material 38. During normal operation of the vehicle 12, when an occupant is seated on and supported by the anti-slip seat cushion 22, a substantially vertical load N is applied to the upper surface 30 of the anti-slip seat cushion 22. As explained below, during normal operation of the vehicle 12, when a substantially vertical load N is applied while an occupant is seated on the anti-slip seat cushion 22, the anisotropic material 38 exhibits principal stiffness. However, when the vehicle 12 experiences sudden deceleration in response to the occupant applying a skid load S (see... Figure 3B The anisotropic material 38 exhibits increased overall stiffness, which substantially prevents occupants from slipping in the vehicle seat assembly 10.

[0051] The anisotropic material 38 consists of a main material 40 and a plurality of inserts 42 dispersed throughout the main material 40. The plurality of inserts 42 are positioned relative to the horizontal axis H at a principal angle... a The orientation ensures that during normal operation, in response to an occupant sitting on the anti-slip seat cushion 22, the principal stiffness of the main material 40 remains substantially constant. It should be understood that when the vehicle 12 experiences sudden deceleration, the skid load S ( Figure 3BThe size and orientation of the inserts vary on the upper surface 30 of the anti-slip seat pad 22. Therefore, the orientation, density, and material of each of the plurality of inserts 42 vary throughout the main material 40 of the anti-slip seat pad 22 based on the local size and local orientation of the slip load S. Thus, although... Figure 2 The consistent orientation of the inserts 42 is shown, wherein the principal angles between each of the inserts 42 are... a They are consistent, but it should be understood that the main perspective... a The inserts 42 vary to align with the local size and orientation of the sliding load S. The lateral distance D between each of the plurality of inserts 42 is measured, where the lateral distance D indicates the density of the inserts 42. Therefore, although... Figure 2 A uniform density is shown, wherein the lateral distance D between each of the inserts 42 is uniform; however, it should be understood that the lateral distance D between each of the plurality of inserts 42 also varies to align with the local size and local orientation of the subtraction load S. As explained below, the material and thickness of the inserts 42 also vary across the entire anti-subtraction seat 22 based on the local size and local orientation of the subtraction load S.

[0052] Figure 3A When a vertical load N is applied to the upper surface 30 of the anti-submarine seat pad 22 ( Figure 1 The above is an enlarged view of the anisotropic material 38, and... Figure 3B This is an enlarged view of the anisotropic material 38 when a skid load S is applied to the upper surface 30 of the anti-skid seat cushion 22. The skid load S is applied to the anti-skid seat cushion 22 when the vehicle 12 experiences sudden deceleration. (Reference) Figure 2 and Figure 3A The primary stiffness of the main material 40 is selected for occupant comfort. That is, the primary stiffness of the main material 40 is selected based on user preferences regarding seat comfort, as well as other factors such as, for example, regulatory requirements, durability considerations, and vehicle type (e.g., sports car seats are firmer than family car seats). An example of the main material 40 includes, but is not limited to, polyurethane foam.

[0053] refer to Figure 1 and Figure 3A In response to a vertical load N being applied to the upper surface 30 of the anti-slip seat pad 22, the plurality of inserts 42 are pushed into a predominantly bending deformation B (in... Figure 3AThe deformation B, primarily bending, is shown in dashed lines, where a vertical load N is applied by an occupant sitting on the anti-submarine seat 22. It should be understood that the plurality of inserts 42 have relatively low bending stiffness, and therefore, when the vertical load N is applied to the upper surface 30 of the anti-submarine seat 22, it has virtually no effect on the principal stiffness of the main material 40. In other words, the principal stiffness of the main material 40 remains substantially unaffected, so an occupant sitting on the anti-submarine seat 22 will not easily notice a change in stiffness.

[0054] Figure 3B When vehicle 12 experiences sudden deceleration, the skid load S is applied to the upper surface 30 of the anti-skid seat cushion 22. Figure 1 (See enlarged view of anisotropic material 38 above.) Reference Figure 1 and Figure 3A Main perspective a The dimensions are set such that, in addition to bending, axial compressive force is generated, and therefore the plurality of inserts 42 experience axial compressive bending F in response to the body 36 of the anti-slip seat 22 experiencing a slip load S, wherein, in Figure 3B The axial compressive bending F is shown as a dashed line. As described above, when the vehicle 12 experiences sudden deceleration, a skid load S is applied by the occupant sitting on the anti-skid seat cushion 22. The axial compressive force applied by the plurality of inserts 42 is in the opposite direction to the skid load S and serves to increase the overall stiffness of the body 36 of the anti-skid seat cushion 22 in a direction aligned with the skid load S. Specifically, the overall stiffness of the body 36 of the anti-skid seat cushion 22 is significantly enhanced by the plurality of inserts 42 along the direction aligned with the skid load S. That is, when the vehicle 12 experiences sudden deceleration, the overall stiffness of the body 36 of the anti-skid seat cushion 22 along the direction of the skid load S is greater than the principal stiffness of the main material 40. When the vehicle 12 decelerates suddenly, the net axial compressive force applied by the plurality of inserts 42 resists the skid of the occupant in the vehicle seat assembly 10. In one embodiment, the plurality of inserts 42 are oriented based on the assumption that the occupant is 50% male or female.

[0055] exist Figure 2 , Figure 3A and Figure 3B In the illustrated embodiment, the plurality of inserts 42 are elongated members extending from the upper surface 30 to the lower surface 32 of the anti-submarine seat 22. However, in an alternative embodiment, the plurality of inserts 42 extend only partially through the anti-submarine seat 22. Figure 4 This is yet another alternative embodiment of the anti-slip seat cushion 22, wherein the plurality of inserts 42 are made of foam material. The foam material of the plurality of inserts 42 has an elastic storage modulus that is at least 25 percent greater than that of the main material 40. Figure 4As shown, the foam material of the plurality of inserts 42 also defines a thickness T. It should be understood that the thickness T of each insert 42 varies to adapt to the local size and local orientation of the sinking load S, wherein a larger thickness T is provided in the region where the local size of the sinking load S is largest. It should be understood that, in the embodiment, only a portion of the plurality of inserts 42 is composed of foam material, and the remaining portions of the inserts 42 are elongated members, wherein the choice of material for the inserts 42 is based on the local size and local orientation of the sinking load S.

[0056] Figures 5A-5E An alternative embodiment of the anti-slip seat pad 122 is shown, wherein, Figure 5A It is the front view and Figure 5B It is along Figure 5A The cross-sectional view of the anti-slip seat pad 122 taken from section line BB in the figure. (Reference) Figure 5A and Figure 5B The main body 136 of the anti-slip seat cushion 122 is composed of a primary material 140 with primary stiffness and a secondary material 142 with secondary stiffness, wherein the elastic storage modulus of the secondary material 142 is at least 25% greater than that of the primary material 140. As will be explained below, the area 150 of the anti-slip seat cushion 122 is composed of the secondary material 142. The area 150 of the anti-slip seat cushion 122 is shaped to conform to the lower body of the occupant to improve occupant comfort while performing the anti-slip function.

[0057] For specific references Figure 5B The anti-slip seat cushion 122 is divided into four quadrants, including an upper front section 160, a lower front section 162, an upper rear section 164, and a lower rear section 166. In an embodiment, region 150 includes a varying height H, wherein the varying height H is greatest in the front sections 160, 162 and tapers towards the rear sections 164, 166 of the anti-slip seat cushion 122 to accommodate the occupant's pelvic and upper thigh regions. Region 150, including secondary material 142, is arranged primarily along the lower sections 162, 166 of the anti-slip seat cushion 122, while primary material 140, selected for occupant comfort, is arranged primarily along the upper sections 160, 164 of the anti-slip seat cushion 122.

[0058] Figure 5B Cross-sectional lines CC, DD, and EE, taken at different distances from the rear sections 164 and 166 of the anti-submarine seat 122, are shown. (Reference) Figure 5B-5E Region 150 is shaped to include a contour line 152, which is oriented in a lateral direction across the anti-slip seat cushion 122 to follow the lower body contour of an occupant seated on the anti-slip seat cushion 122. See specifically... Figure 5EThe profile 152 includes a peak portion 154 disposed between two valleys 156, wherein the two valleys 156 conform to the occupant's thighs and the peak portion 154 conforms to the area where the occupant's thighs are separated, and the peak portion 154 serves to abut against the occupant's pelvis and resist the forward movement of the occupant's pelvis when the vehicle 12 undergoes sudden deceleration. The peak portion 154 and valleys 156 of the profile 152 decrease in height toward the rear sections 164, 166 of the anti-slip seat cushion 122 to accommodate the occupant's pelvic region and upper thigh region.

[0059] Referring generally to the accompanying drawings, the disclosed anti-submarine saddle offers various technical effects and benefits. Specifically, the anti-submarine saddle exhibits anisotropic response, meaning that when an occupant is sitting on the disclosed anti-submarine saddle, he or she experiences lower effective stiffness during normal vehicle operation and significantly higher effective stiffness during sudden deceleration events. The primary stiffness is selected based on occupant comfort, regulatory requirements, durability considerations, and vehicle type. Figure 5B As seen, during normal vehicle operation, the raised area of ​​region 150 in sections 160 and 162 is located between the occupant's legs. Therefore, the interaction between the raised area and the occupant is minimal during normal operation. However, when the vehicle undergoes sudden deceleration and a skid load is applied to the seat cushion, the occupant's tendency to skid is resisted by physical interference between the occupant's pelvis and the raised area 150 in sections 160 and 162. This results in higher effective stiffness, which resists occupant skid during sudden deceleration events. The profile of region 150 is determined by balancing the need to achieve a desired level of occupant comfort during normal operation with the need to prevent occupant skid during sudden deceleration. Anti-skid seat cushions can be particularly advantageous in sleeping or relaxing seats that can recline at relatively large angles of forty-five degrees or greater. Furthermore, in embodiments, the anti-skid seat cushion can be constructed from two different materials with different stiffnesses, wherein the stiffer material is shaped to conform to the occupant's lower body to maintain overall occupant comfort.

[0060] The description in this disclosure is merely exemplary in nature, and variations thereof that do not depart from the essential points of this disclosure are intended to fall within its scope. Such variations should not be considered as departing from the spirit and scope of this disclosure.

Claims

1. An anti-submarine-slip seat cushion for a vehicle, the anti-submarine-slip seat cushion comprising: A main body made of anisotropic material, wherein the anisotropic material includes: Including the main materials for principal stiffness; and Multiple inserts dispersed throughout the main material, Each insert is an elongated member that extends at least partially from the upper surface to the lower surface of the anti-slip seat cushion. During normal operation of the vehicle, when a vertical load is applied while the occupant is seated on the anti-slip seat cushion, the plurality of inserts include relatively low bending stiffness, and the anisotropic material exhibits principal stiffness. The plurality of inserts undergo axial compressive bending in response to the body of the anti-slip seat experiencing a slip load, thereby applying an axial compressive force, wherein the axial compressive force is applied in the opposite direction to the slip load to increase the overall stiffness of the body in the direction aligned with the slip load.

2. The anti-slip seat cushion according to claim 1, wherein, The plurality of inserts are oriented with a principal angle, wherein the principal angle varies between each insert based on the local size and local orientation of the slip load.

3. The anti-slip seat cushion according to claim 1, wherein, In response to the vertical load being applied to the anti-submarine seat pad, the plurality of inserts are pushed into a predominantly bending deformation.

4. The anti-slip seat cushion according to claim 1, wherein, When the axial compressive force is applied, the total stiffness of the body is greater than the principal stiffness of the main material.

5. The anti-slip seat cushion according to claim 4, wherein, When a vertical load is applied to the upper surface of the anti-slip seat, the principal stiffness of the main material is substantially unaffected, and wherein the vertical load is applied by an occupant sitting on the anti-slip seat.

6. The anti-slip seat cushion according to claim 1, wherein, The orientation, density, shape, and material of each of the plurality of inserts vary throughout the main material of the anti-slip seat pad based on the local size and local orientation of the slip load.

7. The anti-slip seat cushion according to claim 1, wherein, The plurality of inserts are made of foam material having an elastic storage modulus that is at least 25 percent greater than that of the main material.

8. The anti-slip seat cushion according to claim 1, wherein, The principal stiffness is selected based on occupant comfort.

9. The anti-slip seat cushion according to claim 1, wherein, In response to a vertical load being applied to the anti-submarine seat pad, the anisotropic material exhibits the principal stiffness.

10. A vehicle seat assembly, comprising: Seat plate; An anti-slip seat cushion supported by the seat plate, wherein the anti-slip seat cushion comprises: A main body made of anisotropic material, wherein the anisotropic material includes: Including the main materials for principal stiffness; and Multiple inserts dispersed throughout the main material, Each insert is an elongated member that extends at least partially from the upper surface to the lower surface of the anti-slip seat cushion. During normal operation of the vehicle, when a vertical load is applied while the occupant is seated on the anti-slip seat cushion, the plurality of inserts include relatively low bending stiffness, and the anisotropic material exhibits principal stiffness. The plurality of inserts are oriented to apply an axial compressive force in response to the body of the anti-slip seat experiencing a sliding load, wherein the plurality of inserts are applied in a direction opposite to the sliding load to increase the overall stiffness of the body in a direction aligned with the sliding load.

11. The vehicle seat assembly of claim 10, wherein, The plurality of inserts are oriented with a principal angle, wherein the principal angle varies between each insert based on the local size and local orientation of the slip load.

12. The vehicle seat assembly of claim 10, wherein, In response to the vertical load being applied to the anti-submarine seat pad, the plurality of inserts are pushed into a predominantly bending deformation.

13. The vehicle seat assembly of claim 10, wherein, When the axial compressive force is applied, the total stiffness of the body is greater than the principal stiffness of the main material.

14. The vehicle seat assembly of claim 13, wherein, When a vertical load is applied to the upper surface of the anti-slip seat, the principal stiffness of the main material is substantially unaffected, and wherein the vertical load is applied by an occupant sitting on the anti-slip seat.

15. The vehicle seat assembly of claim 10, wherein, The orientation, density, and material of each of the plurality of inserts vary throughout the main material of the anti-slip seat pad based on the local size and local orientation of the slip load.

16. The vehicle seat assembly of claim 10, wherein, The plurality of inserts are made of foam material having an elastic storage modulus that is at least 25 percent greater than that of the main material.

17. The vehicle seat assembly of claim 12, wherein, The vehicle seat assembly is either a sleep seat or a relaxation seat.

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