Seat cushion member with local stress relief for ride comfort

Abstract

A seat cushion member for mitigating localized pressure concentration of an occupant is provided. The seat cushion member includes a seat suspension, a backing foam layer disposed on the seat suspension, a feature layer disposed on the backing foam layer, a top foam layer disposed on the feature layer, and a trim layer disposed on the top foam layer. The feature layer has a plurality of features, and at least some of the plurality of features undergo a limit point traversal when the seat cushion member is occupied.

Description

Technical Field

[0001] The present disclosure relates to a seat for use in a vehicle, and more particularly, to a seat having a cushioning member that can relieve local stress for a vehicle occupant. Background Art

[0002] When an occupant is seated, some areas of the occupant's body, such as the ischial tuberosities, support a large portion of the occupant's load. Other areas of the occupant's body, such as below the knees, have blood vessels that carry blood to the lower leg close to the skin. However, prolonged sitting can cause discomfort due to compression of the tissues and blood vessels in the sensitive areas of the occupant.

[0003] Therefore, although current vehicle seats achieve their intended purpose, there is still a need for a new and improved vehicle seat with local comfort. Summary of the Invention

[0004] According to several aspects of the present disclosure, a seat cushion member for relieving local pressure concentration of an occupant is provided. The seat cushion member includes a seat suspension, a backing foam layer disposed on the seat suspension, a feature layer disposed on the backing foam layer, a top foam layer disposed on the feature layer, and a decorative layer disposed on the top foam layer. The feature layer has a plurality of features, and at least some of the plurality of features experience limit point traversal when the seat cushion member is occupied.

[0005] According to another aspect of the present disclosure, the seat cushion member includes a backing foam layer having a plurality of pits.

[0006] According to another aspect of the present disclosure, the feature layer of the seat cushion member includes a first feature layer and a second feature layer.

[0007] According to another aspect of the present disclosure, the seat cushion member includes a plurality of features that return to a non-displaced configuration when a load is removed from at least a portion of the seat cushion member.

[0008] According to another aspect of the present disclosure, the seat cushion member includes a plurality of features that include a first set of features and a second set of features. The first set of features has limit points different from those of the second set of features.

[0009] According to another aspect of the present disclosure, the seat cushion member includes a plurality of features that include a housing having a circular or polygonal base.

[0010] According to another aspect of the present disclosure, the seat cushion member includes a plurality of features that are housings in the form of pipe segments.

[0011] According to another aspect of the present disclosure, the seat cushion member includes a plurality of features having a circular cross-section.

[0012] According to another aspect of the present disclosure, the seat cushion member includes a plurality of features having a polygonal cross-section. According to another aspect of the present disclosure, the seat cushion member is disposed in at least one of a seat cushion, a seat back, a headrest, a calf support, or an arm support.

[0013] According to another aspect of the present disclosure, the seat cushion member includes a non-displacement feature extending into the top foam layer.

[0014] According to several aspects of the present disclosure, there is provided a seat for alleviating local pressure concentration of an occupant in a vehicle. The seat includes at least one of a seat cushion or a seat back and a seat cushion member disposed within a seat cushion housing. The seat cushion member includes a seat suspension, a backing foam layer disposed on the seat suspension, a feature layer disposed on the backing foam layer, a top foam layer disposed on the feature layer, and a decorative layer disposed on the top foam layer. The feature layer has a plurality of features, and at least some of the plurality of features experience limit point traversal when the seat cushion member is occupied.

[0015] According to another aspect of the present disclosure, the seat includes a feature layer having a first feature layer and a second feature layer.

[0016] According to another aspect of the present disclosure, the seat includes a backing foam layer that includes a plurality of pits. The features correspond to the plurality of pits, and the non-displacement features of the feature layer extend into the top foam layer.

[0017] According to another aspect of the present disclosure, the seat includes a plurality of features having a first set of features and a second set of features. The first set of features has a limit point different from that of the second set of features.

[0018] According to another aspect of the present disclosure, the seat includes a plurality of features that are shells having a circular or polygonal base.

[0019] According to another aspect of the present disclosure, the seat includes a plurality of features that are shells in the form of pipe segments.

[0020] According to several aspects of the present disclosure, a seat for alleviating local pressure concentration of an occupant in a vehicle is provided. The seat includes a seat cushion and a seat cushion member disposed within a seat cushion housing. The seat cushion includes a seat cushion housing for receiving the occupant, and the seat cushion housing has an outer surface for receiving the occupant. The seat cushion housing is configured to be deformable and sealable. The seat cushion member includes a seat suspension, a backing foam layer disposed on the seat suspension, a feature layer disposed on the backing foam layer, a top foam layer disposed on the feature layer, and a decorative layer disposed on the top foam layer. The backing foam layer includes a plurality of pits. The feature layer has a set of first features and a set of second features, and the first features and the second features correspond to the plurality of pits. At least some of the first features and the second features are configured to undergo limit point traversal when the seat cushion member is occupied. The non-displacement features extend into the top foam layer.

[0021] According to another aspect of the present disclosure, the seat includes a feature layer having a third feature, and the third feature has a limit point different from the first and second features.

[0022] According to another aspect of the present disclosure, the seat includes first and second features that are shells having a circular or polygonal base.

[0023] Further application areas will become apparent from the description provided herein. It should be understood that these descriptions 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

[0024] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure in any way.

[0025] Figure 1 is a perspective view of a vehicle seat according to the present disclosure, the vehicle seat including a seat cushion member having a feature layer having dome features for alleviating local stress for an occupant in an exemplary vehicle;

[0026] Figure 2 is according to the present disclosure Figure 1 a cross-sectional side view of the seat cushion member in the vehicle seat shown;

[0027] Figure 3A is according to the present disclosure Figure 2 a perspective view of the non-displacement features of the feature layer included in the seat cushion member shown;

[0028] Figure 3B is according to the present disclosure Figure 2 a perspective view of the displacement features of the feature layer included in the seat cushion member shown;

[0029] Figure 3C is according to the present disclosureFigure 2 Cross-sectional side view of the characteristics of the characteristic layer included in the seat cushion member shown;

[0030] Figure 4 is a graphical representation of the load-displacement response of several characteristics as shown in accordance with the present disclosure; Figure 2 having different designs exhibiting a limit point response;

[0031] Figure 5 is a perspective view of a characteristic layer having a one-dimensional configuration as shown in accordance with the present disclosure; Figure 2 shown;

[0032] Figure 6 is a perspective view of a characteristic layer having a two-dimensional configuration as shown in accordance with the present disclosure; Figure 2 shown;

[0033] Figure 7 is a perspective view of a characteristic layer having a first characteristic layer and a second characteristic layer as shown in accordance with the present disclosure; Figure 2 shown;

[0034] Figure 8 is a perspective view of a vehicle seat in accordance with the present disclosure, the vehicle seat including a seat cushion member having a characteristic layer having a semi-cylindrical characteristic for relieving local stress on an occupant.

[0035] Figure 9 is a perspective view showing a semi-cylindrical characteristic of a characteristic layer and a vehicle seat having a semi-circular cross-section as shown in accordance with the present disclosure; and Figure 8 shown;

[0036] Figure 10 is a perspective view showing a semi-cylindrical characteristic of a characteristic layer and a vehicle seat having a trapezoidal cross-section as shown in accordance with the present disclosure. Figure 8 shown; DETAILED DESCRIPTION

[0037] The following description is merely exemplary in nature and is not intended to limit the present disclosure, application, or uses.

[0038] When a component, element, or layer is referred to as being "on", "engaged to", "connected to", or "coupled to" another element or layer, it may be directly on, engaged, connected, or coupled to the other element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being "directly on", "directly engaged to", "directly connected to", or "directly coupled to" another element or layer, intervening elements or layers may be present. Other words used to describe the relationship between elements should be interpreted in a like manner, such as "between" relative to "directly between", "adjacent" relative to "directly adjacent", etc. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0039] Figure 1 is a perspective view showing a vehicle seat 10 in an exemplary vehicle 11. According to one aspect of the present disclosure, the vehicle seat 10 includes a seat cushion 12 and a seat back 14, as well as a seat cushion member 16 for alleviating local pressure concentration of an occupant. As shown, the vehicle seat 10 is used in a vehicle, such as a road passenger vehicle, a marine vehicle (such as a ship), or an aircraft vehicle (such as a drone or a passenger aircraft), etc. It should be understood that the vehicle seat 10 can be used for other applications, such as a furniture seat, such as a sofa or an outdoor chair. The vehicle seat 10 may also include a calf support, a headrest, an armrest, etc. (not specifically shown), which are configured to accommodate an occupant. The seat cushion 12 and / or the seat back 14 includes a seat cushion outer shell 18 arranged to be deformable and sealable. The seat cushion outer shell 18 includes an interior (not shown) for accommodating the seat cushion member 16 and an outer surface 19 for accommodating an occupant.

[0040] Figure 2 is a cross-sectional view along Figure 1 line 2-2 in Figure 1 shows a cross-sectional view of the seat cushion member 16. The seat cushion member 16 is configured to improve occupant comfort by alleviating local pressure concentration and redistributing the occupant load to a wider support area. The seat cushion member 16 is disposed within the seat cushion outer shell 18 of the seat cushion 12, the seat back 14, the calf support, the headrest, and / or the armrest. The seat cushion member 16 includes a seat suspension 20, a backing foam layer 22, a feature layer 24, and a top foam layer 26.

[0041] The seat suspension 20 is operatively coupled to the seat structure. The seat suspension 20 may include a metal or plastic seat frame and a spring for providing cushioning.

[0042] Figure 2Shows the backing foam layer 22 of the member 16 disposed on the optional intermediate element 32 supported by the seat suspension 20. The backing foam layer 22 includes a foam layer for providing support and suspension. The backing foam layer 22 can be formed of any material that is compressible and supports the occupant of the vehicle seat 10, such as polyurethane foam. Additionally, the backing foam layer 22 can include a plurality of pits 30. The pits 30 include notches or spaces within the backing foam layer 22. The pits 30 can extend partially into the backing foam layer 22 or completely through the backing foam layer 22. In some cases, the backing foam layer 22 may not include the pits 30.

[0043] As Figure 2 shown, the optional intermediate element 32 can be disposed between the backing foam layer 22 and the seat suspension 20. This can take the form of another foam layer, an elastomeric pad, a semi-flexible plastic pad, etc. When the intermediate element 32 is used, it provides an additional support and cushioning layer for the occupant.

[0044] Referring Figure 2 , when the intermediate element 32 is included, the feature layer 24 is disposed on the backing foam layer 22 or the optional intermediate element 32. The feature layer 24 includes a plurality of features 34 that provide passive structural elements that experience traversal of a limit point, which relieves pressure concentration on the occupant and improves long-term comfort. Each feature 34 corresponds to one of the plurality of pits 30 such that when the feature 34 is deformed, e.g., by the occupant of the vehicle seat 10, the resulting deformed feature 34 extends and / or is pressed into and at least partially fills the corresponding pit 30. The plurality of features 34 are monostable, and thus, once traversing through the elastic limit point, they do not maintain their deformed positions.

[0045] Referring Figure 1 and Figure 2, the feature layer 24 includes a set of first features 36 and a set of second features 38. The first features 36 have a first characteristic, such as a first threshold point. The first threshold point is the elastic limit, beyond which the load-displacement relationship of the feature 36 changes. The second features 38 have a second characteristic, such as a second threshold point. The second threshold point is the elastic limit, beyond which the load-displacement relationship of the feature 38 changes. In a preferred embodiment, the first threshold and the second threshold are different, thereby providing two sets of deformation or displacement levels. Additionally, the first features 36 can have different dimensions (e.g., radius, thickness, pitch, height, etc.) from the second features 38. For example, the height and radius of the first features 36 can be greater than those of the second features 38. The features 34 can be arranged symmetrically (e.g., a first row of first features 36, a second row of second features 38, a third row of first features 36, etc.), or they can be arranged asymmetrically (e.g., randomly). The features 36 and 38 can be arranged in groups for specific regions of interaction with an occupant (e.g., the features 36 can be arranged in a portion of the seat that may interact with the ischial tuberosities of the occupant, while the features 38 can be arranged in a region that may support the underside of the knees).

[0046] The features 34 of the feature layer 24 are designed to have a predetermined limit point threshold and specific mechanical properties. In one aspect, the feature 34 can have a crease 40 that at least partially extends around a portion of the feature 34 to facilitate a specific limit point threshold and / or non-axisymmetric displacement. In another aspect, the feature 34 can have one or more perforations. The parameters that affect the limit point threshold and mechanical properties can include material, thickness, radius, height, unit pitch, crease position during displacement, crease size, perforation pattern, and / or perforation density.

[0047] The feature layer 24 can be formed from a variety of materials depending on the desired limit point threshold or mechanical properties. For example, without departing from the spirit or scope of the present disclosure, the feature layer 24 can include polymers, elastomers (e.g., neoprene, isoprene, vulcanized rubber, ethylene propylene diene monomer (EPDM), silicone rubber, etc.), thermoplastics (e.g., high-density polyethylene (HDPE)), low-density polyethylene (LDPE), polyethylene (PE), polyurethane (PU), etc.), thermosets, polyolefins, polyethylene, polypropylene, polystyrene, polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate, acrylic polymers, polyacrylonitrile, polymethyl methacrylate, or any other suitable material.

[0048] In one aspect of the present disclosure, the feature layer 24 may include a third feature 42 having a third characteristic. For example, the third feature 42 may be smaller or differently sized than the first feature 36 and the second feature 38. Additionally, the third feature 42 may have different limit points and / or mechanical characteristics than the first feature 36 and the second feature 38. It should be understood that the feature layer 24 may include additional feature groups (e.g., a fourth feature, a fifth feature, etc.).

[0049] Figures 3A - 3B One feature 34 is shown in a dome configuration. The feature 34 having a dome configuration has a circular cross-section and / or a circular or polygonal base. Using a feature 34 having a polygonal base can reduce the number of capture patterns and can allow for more precise control of the limit point threshold because a polygon has lower symmetry than a circle. In Figure 3A , the feature 34 is shown in an original or undisplaced configuration before an occupant occupies the vehicle seat 10. In Figure 3B , when an occupant occupies the vehicle seat 10 and the force from the occupant exceeds the limit point threshold of the feature, the feature 34 is shown in a displaced configuration.

[0050] Figure 3C A cross-section along line 3C-3C in Figure 1 is shown. Figure 1 The feature 34 in Figure 3A and Figure 3B is in a dome configuration as shown. The feature 34 is a dome connected to a flat area 44 of the feature layer 24 and has a thickness t, a height h, a base radius R, and a distance S between the feature centers, which are predetermined to achieve certain mechanical characteristics and a specified limit point threshold. The feature 34 has a shallowness ratio SH = h / R and a slenderness ratio SL = h / t. Additionally, the feature 34 has a mesoscale pattern spacing and can be quantified and represented as a packing ratio PK = S / R by the distance S between adjacent feature centers. In one aspect, the base radius R of the feature 34 shown in FIG. 3 is 8 millimeters (mm), the shallowness ratio SH is 0.6, and the slenderness ratio SL is 10. In another aspect, the base radius R of the feature 34 shown in FIG. 3 is 8 mm, the shallowness ratio SH is 0.75, the slenderness ratio SL is 10, and the packing ratio PK is 3. It should be understood that the feature 34 may include other configurations and dimensions.

[0051] Refer to Figure 4, when the seat cushion member 16 is occupied, the feature 34 undergoes limit point traversal. Each feature 34 has two stable states and exhibits a limit point in its mechanical response to an applied force (e.g., Newton (N)) caused by, for example, a seat occupant. At point 1, each feature has a positive stiffness, but the applied load is below the limit point threshold. When the load - displacement relationship of the feature 34 represented by line A experiences a load increase, the displacement of the feature 34 is gradual. However, the load - displacement relationship changes significantly at the limit point threshold represented by point 4. For loads greater than the load corresponding to point 4, the reduction in the stiffness of this feature reduces its load - bearing capacity for these loads. Once the threshold force value of this function is exceeded, the load on the body part of the occupant supported by such a function will increase at a slower rate compared to the adjacent area supported by traditional seat foam. After removing any load, the feature 34 represented by line A can gradually return to the non - displaced state.

[0052] Figure 4 The shown line B represents a feature 34 configured to be rapidly loaded, for example, during an underwater event. In this configuration, the feature 34 exhibits an initial load - displacement response similar to the response represented by curve A, where the stiffness of the feature significantly decreases at the limit point represented by 4. However, the feature whose response is represented by curve B exhibits another limit point. This corresponds to a sudden drop in the load in the state represented by 2. The sudden drop in the load is followed by large deformations at negative stiffness, resulting in a displacement state (as shown at point 3), which can be described as "sudden" or rapid displacement. The feature 34 represented by line B can quickly return to the non - displaced state after removing any load. In other cases, the feature represented by line B can be bistable, and after displacement, the feature 34 may require additional force to return to the non - displaced state, for example, using pressurized air. The sudden drop in the supported load and the large subsequent displacement triggered by a load exceeding the second limit point threshold can be used to mitigate the slippage of the occupant during a sudden deceleration event.

[0053] Figure 4The line C shown represents feature 34, which exhibits positive stiffness until it reaches a limit point (shown at point 4). For loads above the limit point load, feature 34 exhibits negative stiffness until it reaches a minimum force level for positive support loads. If feature 34 continues to be loaded beyond this point, it again exhibits positive stiffness. Feature 34 represented by line C can quickly return to the non-displaced state after any load is removed. The negative stiffness of feature 34 represented by line C causes load shedding of feature 34 in its operating state. This load shedding results in a local pressure drop in the occupant body area supported by this feature 34. The load released by these features 34 is redistributed to other parts of the occupant's body (e.g., the surrounding area supported by traditional seat foam). The spatial distribution of these features 34 in the seat is designed such that the load is redistributed in a way that increases the overall comfort of the occupant.

[0054] The region 37 of the feature layer 24 can be adapted to reduce the risk of the occupant sliding down during a sudden deceleration event. This can be done by arranging feature 34 having a load-displacement relationship represented by the point B in Figure 4 in a specific region of the seat cushion member 16 (e.g., Figure 1 the region 37 shown). The region 37 can extend from about 50 millimeters (mm) in front of the H point (or hip point) to about 150 mm in front of the H point. Feature 34 is configured such that during normal operation of the vehicle, the load applied by the occupant on feature 34 does not reach the level of the second limit point threshold. However, during a sudden deceleration event, the high inertial forces acting on the occupant cause the load applied by the occupant on feature 34 to exceed the second limit point threshold. The resulting sudden drop in the support load and the large deflection of the feature layer 24 cause the occupant to sink into the seat and their forward movement to be restricted by the seat structure rather than sliding forward under the seat belt.

[0055] Reference Figure 5 to the example shown, feature 34 can be arranged on the feature layer 24 in a one-dimensional configuration (e.g., a line, 6X1 grid). Reference Figure 6 to the example shown, feature 34 can be arranged on the feature layer 24 in a two-dimensional configuration (e.g., 3X3 grid). It should be understood that feature 34 can be arranged in other one-dimensional and two-dimensional arrangements (e.g., 1X10 grid, 1X20 grid, 2X10 grid, 15X15 grid, etc.).

[0056] Reference Figure 7, the first feature layer 46 can be positioned adjacent to and parallel to the second feature layer 48. Both the first feature layer 46 and the second feature layer 48 are shown as having a plurality of features 34 in a 4X2 grid. However, the features 34 of the first feature layer 46 and the second feature layer 48 can include any number of arrangements and can include a set of first features 36, a set of second features 38, and so on. The first feature layer 46 and the second feature layer 48 can be coupled or uncoupled together and can be separated by air, foam, or some other material.

[0057] Referring again to Figure 2 , a top foam layer 26 is disposed on the feature layer 24. The top foam layer 26 is a foam layer that provides support and cushioning for the occupant of the vehicle seat 10. The foam can be formed from a variety of materials, such as polymers. The top foam layer 26 is arranged such that when the features 34 are in an undeformed or undisplaced state, the features 34 extend into the top foam layer 26, and the top foam layer 26 is formed to at least partially surround the surfaces of the feature layer 24 and the features 34. In some cases, the top foam layer 26 does not form around the surfaces of the feature layer 24 and the features 34.

[0058] Figure 2 A decorative layer 28 is shown disposed on the top foam layer 26. The decorative layer 28 provides an external protective layer for the seat cushion member 16 and / or the seat cushion member 16. In some aspects, the decorative layer 28 can also be part of or the same as the seat cushion housing 18. The decorative layer 28 can be formed from a variety of materials, such as polymers such as silicone or polypropylene or natural vulcanized rubber.

[0059] Figure 8 is a cross-sectional view of a vehicle seat 10 having a seat cushion member 16, the seat cushion member 16 including a feature layer 24 having features 34 configured as a semi-cylindrical arrangement or a shell in the form of a pipe section. In this arrangement, the features 34 are semi-cylinders or partial cylinders that extend along at least a portion of the feature layer 24. The semi-cylindrical features 34 can have different dimensions (e.g., radius, thickness, height, etc.) and can have different lengths. When the features 34 are semi-cylinders, the features 34 can have closed ends, open ends, or a combination thereof.

[0060] As Figure 8 shown, the feature layer 24 includes a first set 50 of semi-cylindrical features 34 and a second set 52 of semi-cylindrical features 34. The first set 50 of semi-cylindrical features 34 has different mechanical properties from the second set 52 of semi-cylindrical features 34. For example, the first set 50 of semi-cylindrical features 34 can have a different height and thickness from the second set 52 of semi-cylindrical features 34. The first set 50 of semi-cylindrical features 34 and the second set 52 of semi-cylindrical features 34 can include other different properties (e.g., radius, distance between feature centers, etc.). Additionally, asFigure 8 As shown, a portion of the semi-cylindrical feature 34 (e.g., the first set of semi-cylindrical features 34) can be oriented differently (e.g., perpendicularly) from another portion of the semi-cylindrical feature 34 (e.g., the second set 52 of semi-cylindrical features 34).

[0061] Reference Figure 9 , the semi-cylindrical feature 34 can have a semi-circular cross-section. In this example, the semi-cylindrical feature 34 can include a consistent radius or a varying radius (e.g., a first portion of the feature 34 having a first radius and a second portion of the feature 34 having a second radius).

[0062] Figure 10 is a perspective view of a semi-cylindrical feature 34 having a trapezoidal or polygonal cross-section. In Figure 10 the example shown, the trapezoidal cross-section can extend the entire length of the feature 34 or can be arranged only in a portion of the feature 34. It is contemplated that the semi-cylindrical feature 34 can include other cross-sectional configurations, such as square, rectangular, polygonal, arched, and / or irregular patterns.

[0063] The vehicle seat 10 having the seat cushion member 16 including the feature layer 24 of the present disclosure has several advantages. When an occupant is seated, some areas of the occupant's body (e.g., the ischial tuberosities) support a large portion of the occupant load. Other areas (e.g., under the knees) have blood vessels that carry blood to the lower part of the occupant's legs close to the skin. Prolonged sitting can cause discomfort due to compression of the tissue and blood vessels in the sensitive areas of the occupant's body. The feature layer 24 is a passive structural element in which the feature 34 undergoes restricted point traversal, which relieves the pressure concentration in these sensitive areas. The relieved pressure concentration provides long-term comfort for the occupant. Additionally, the feature layer 24 facilitates a thinner seat rather than using additional cushioning, which would otherwise make the vehicle seat thicker and heavier.

Claims

1. A seat cushion member for relieving local pressure concentration on an occupant, comprising: A seat suspension; A backing foam layer disposed on the seat suspension; A feature layer disposed on the backing foam layer, wherein the feature layer has a plurality of features, and wherein at least some of the plurality of features undergo limit point traversal when the seat cushion member is occupied; A top foam layer disposed on the feature layer; And A decorative layer disposed on the top foam layer.

2. The seat cushion member according to claim 1, wherein the backing foam layer includes a plurality of pits.

3. The seat cushion member according to claim 1, wherein the feature layer includes a first feature layer and a second feature layer.

4. The seat cushion member according to claim 1, wherein when a load is removed from at least a portion of the seat cushion member, the plurality of features return to a non-displaced configuration.

5. The seat cushion member according to claim 1, wherein the plurality of features include a set of first features and a set of second features, wherein the set of first features has a different limit point from the set of second features.

6. The seat cushion member according to claim 1, wherein the plurality of features include a housing having a circular or polygonal base.

7. The seat cushion member according to claim 1, wherein the plurality of features include a housing in the form of a pipe section.

8. The seat cushion member according to claim 7, wherein the plurality of features have a circular cross-section.

9. The seat cushion member according to claim 7, wherein the plurality of features have a polygonal cross-section.

10. The seat cushion member according to claim 1, wherein the seat cushion member is disposed in at least one of a seat cushion, a seat backrest, a headrest, a calf support, or an arm support.

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