Gasket

Abstract

A seat cushion is provided with a monolithic web of expanded thermoplastic resin strands. The web may include two web layers having a weld formed at least partially along a seam of the web. The pad may be mounted on the pallet and covered with a skin forming a trim cover. Alternatively, the cushion may be mounted on the frame and hidden by the trim cover.

Description

[0001] Cross - reference to related applications

[0002] This application claims priority to Danish Patent Application No. PA2023 70421, filed on August 16, 2023, which in turn claims priority to U.S. Application No. 18 / 087,852, filed on December 23, 2022. The disclosures of these applications are hereby incorporated herein by reference in their entirety. Technical field

[0003] Various embodiments relate to a gasket formed from a unitary mesh of expanded thermoplastic resin strands. Brief description of the drawings

[0005] Figure 1 is a front perspective view of a seat assembly according to an embodiment;

[0006] Figure 2 is according to an embodiment of Figure 1 a partial perspective view of the gasket of the seat assembly;

[0007] Figure 3 is a perspective view of a manufacturing method according to an embodiment;

[0008] Figure 4 is Figure 3 another perspective view of the manufacturing method of;

[0009] Figure 5 is Figure 3 another perspective view of the manufacturing method of;

[0010] Figure 6 is a perspective view of a manufacturing method according to another embodiment;

[0011] Figure 7 is Figure 6 a perspective view of the manufacturing method of; and

[0012] Figure 8 is Figure 7 a perspective view of the manufacturing method of.

[0013] Detailed description

[0014] Reference will now be made in detail to the embodiments, examples of which are illustrated in the accompanying drawings. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the various described embodiments. However, it will be apparent to one of ordinary skill in the art that the various described embodiments may be practiced without these specific details. In other instances, well-known methods, procedures, components, circuits, and networks have not been described in detail so as not to unnecessarily obscure aspects of the embodiments.

[0015] It should be understood that the disclosed embodiments are merely exemplary, and that various forms and alternative forms are possible. The drawings are not necessarily to scale; some features may be enlarged or minimized to show details of particular components. Thus, the specific structural and functional details disclosed herein should not be construed as limiting, but merely as a representative basis for teaching one of ordinary skill in the art to variously utilize the embodiments in accordance with the disclosure.

[0016] "One or more" includes functions performed by one element, functions performed by more than one element (e.g., in a distributed manner), several functions performed by one element, several functions performed by several elements, or any combination of the foregoing.

[0017] It should also be understood that although the terms first, second, etc. are used in some cases herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first contact may be referred to as a second contact, and similarly, a second contact may be referred to as a first contact, without departing from the scope of the various described embodiments. Both the first contact and the second contact are contacts, but they are not the same contact.

[0018] The terminology used in the description of the various embodiments herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used in the description of the various described embodiments and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that, as used herein, the term "and / or" refers to and encompasses any and all possible combinations of one or more of the associated listed items. It should be further understood that when used in this specification, the terms "include", "including", "comprise", and / or "comprising" specify the presence of the stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0019] As used herein, the term "if" is optionally interpreted to mean "when" or "upon" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrase "if determined" or "if [the condition or event] is detected" is optionally interpreted to mean "when determining" or "in response to determining" or "when [the condition or event] is detected" or "in response to detecting [the condition or event]", depending on the context.

[0020] Figure 1 Illustrated is a seat assembly 20 as a vehicle seat assembly 20 according to an embodiment. Although the vehicle seat assembly 20 is illustrated and described, any seat assembly 20 may be employed. The seat assembly 20 can be used for land vehicles, aircraft, boats, etc. The seat assembly 20 can also be used for office chairs, comfort chairs, etc.

[0021] The depicted seat assembly 20 includes a seat bottom cushion 22 to support the pelvis and thighs of a seated occupant. The seat assembly 20 also includes a seat back cushion 24 to support the back and shoulders of the seated occupant. A trim cover 26 is disposed over the seat cushions 22, 24 to conceal the seat cushions 22, 24 and provide a uniform and smooth contact surface for the occupant.

[0022] Now referring Figure 2 , in part, shows two cushions 28, 30 removed from the seat assembly 20. Each cushion 28, 30 is formed from a plurality of strands 32 of extruded expanded thermoplastic resin, as disclosed in U.S. Provisional Patent Application 63 / 357,163 to Geisler et al. filed on June 30, 2022 by Lear Corporation, the disclosure of which is incorporated herein by reference in its entirety.

[0023] Cushion 28 is provided by two mesh portions 34, 36, each mesh portion 34, 36 formed from an integral non-foamed web of thermoplastic resin strands 32. The mesh portions 34, 36 are joined together at least in part along mating surfaces 40, 42 between the mesh portions 34, 36. Welds 38 are formed at least in part along the mating surfaces 40, 42 of the mesh portions 34, 36. The two mesh portions 34, 36 can be separately formed mesh layers 34, 36 or can be integrally formed as two separate regions 34, 36 that are folded into an overlap to be welded.

[0024] The mesh portions 34, 36 may each include a skin 40, 42 which is formed as mating surfaces 40, 42 of the mesh portions 34, 36 to increase the contact area of the weld 38. The skins 40, 42 may be formed by strands 32 that are more densely concentrated at the mating surfaces 40, 42, such that the skins 40, 42 are formed by the more dense surface of the strands 32. The weld 38 extends along the mesh portions 34, 36 as a seam therebetween, thereby surrounding the mesh portions 34, 36 and / or connecting separate segments 34, 36.

[0025] Figure 3 Illustrated are mesh portions 34, 36 stacked on top of one another. The mesh portions 34, 36 are provided below a welder 44. The welder 44 may be automated or manually operated. According to one embodiment, the welder 44 is an ultrasonic welder 44. Any welder 44 may be used, such as a thermal welder or a friction stir welder. The welder 44 includes a welder arm 46 and has a welding tip 48 at the distal end of the welder arm 46. In Figure 4 , the welding arm 46 extends the welding tip 48 into contact with the mesh portion 34, thereby compressing the mesh portions 34, 36 to enhance the contact between the mesh portions 34, 36. In Figure 4 , the welding tip 48 also ultrasonically vibrates under the pressure of the welder arm 46 to create friction between the mesh portions 34, 36, thereby melting the mesh portions 34, 36 at the mating surfaces 40, 42. The melted mating surfaces 40, 42 of the mesh portions 34, 36 cool to solidify and form the weld 38.

[0026] In Figure 5 , the welding arm 46 retracts to allow the mesh portions 34, 36 to expand as a unitary welded cushion 28. The weld 38 includes a consistent depth, such as a number of strands 32 that extend a certain amount beyond the mating surfaces 40, 42. For example, the amount of strands 32 may be up to three strands 32. The consistent depth of the weld 38 is more consistent and repeatable than an adhesive, which typically drips over the mating surface and creates a denser and inconsistent bond outside of the lower mating surface. By omitting the adhesive, the cushion 28 is formed of a single consistent material, thereby simplifying recyclability. Additionally, the weld 38 provides flexibility that is less rigid compared to a comparable adhesive bond.

[0027] The welding gasket 28 provides a lightweight, sustainable comfort solution for the seat assembly 20, thereby reducing the vehicle weight while maintaining occupant support to reduce costs and improve fuel efficiency. The strands 32 of the mesh portions 34, 36 provide a reduced surface area for bonding. However, compressing the mesh portions 34, 36 enhances the density and area of the mating surfaces 40, 42 to create the weld portion 38, which is stronger than the adhesive in applicable tests (such as shear resistance). Although the two mesh portions 34, 36 are illustrated as being welded together, any number of mesh portions 34, 36 and any number of weld portions 38 can be employed to fabricate various gaskets 28.

[0028] Various parameters of the welding process can be changed for various specifications or applications. For example, the power, voltage, and current of the welder 44 can be adjusted to regulate the performance of the weld portion 38. Similarly, the adjustment of the proximity of the welding tip 48 to the contact points of the mesh portion 34 and the pressure applied to the mesh portions 34, 36 by the extension of the welding arm 46 can also change the performance of the weld portion 38. The time of the weld portion 38 can also be changed to alter the performance. At the welder tip 48, the frequency of the tip 48 can be changed for different welding performances. Additionally, the shape of the welder tip 48 can be adjusted to regulate the performance resulting in surface welding, spot welding, etc.

[0029] Various configurations of the mating surfaces 40, 42 can also be employed to achieve different mating configurations. For example, the two mating surfaces 40, 42 can include skin layers. Alternatively, one of the mating surfaces 40 can include a skin layer while the other mating surface 42 includes a surface area with a lower density of strands 32. In another embodiment, neither of the two mating surfaces 40, 42 includes a skin layer. Additionally, the weld portion 38 can be changed by varying the materials of the mesh portions 34, 36, adjusting the area of the mating surfaces 40, 42, or changing the amount of the weld portion between the mesh portions 34, 36. Various materials can include polyethylene, linear low density polyethylene, high density polyethylene, polypropylene, polycarbonate, thermoplastic polyester elastomer, acrylonitrile butadiene styrene, polyoxymethylene, etc.

[0030] Referring again to Figure 1 , according to an embodiment, the gasket 28 is installed with the seat assembly 20 under the carrier 50 below the trim cover 26. In another embodiment, the gasket 28 is installed on the frame 52 and hidden by the trim cover 26. In Figure 1 , an area of the trim cover 26 is partially removed to expose the strands 32 of the gasket 28.

[0031] Now referring to Figure 2, the gasket 30 is provided by the mesh portion 54, which is formed from an integral non-foamed mesh of thermoplastic resin strands 32. The support member 56 is attached to the mesh portion 54. As shown, the support member 56 can be a decorative member 56, such as a tab 56. The mesh portion 54 and the tab 56 are joined together at least in part along mating surfaces 58, 60 between the mesh portion 54 and the tab 56. The weld 62 is formed at least in part along the mating surfaces 58, 60 of the mesh portion 54 and the tab 56. According to another embodiment, the support member 56 is a suspension member. According to yet another embodiment, the support member 56 is a tray. The support member 56 can be any weldable member for attaching the mesh portion 54 to another seat component 56.

[0032] The mesh portion 54 can include a skin 60 that is formed as the mating surface 60 of the mesh portion 54 to increase the contact area of the weld 62. The skin 60 can be formed by strands 32 that are more densely concentrated at the mating surface 60 to form the skin 60 from the more dense surface of the strands 32. The weld 62 extends along the mesh portion 54 and the tab 56 as a seam therebetween, thereby surrounding the mesh portion 54 and the tab 56 and / or connecting the mesh portion 54 and the tab 56.

[0033] Figure 6 The support member 56 stacked on the mesh portion 54 is illustrated. The mesh portion 54 and the tab 56 are provided below the welder 44. In Figure 7 , the welder arm 46 extends the welding tip 48 into contact with the support member 56, thereby compressing the mesh portion 54 to enhance the contact between the mesh portion 54 and the support member 56. In Figure 7 , the welding tip 48 also ultrasonically vibrates under the pressure of the welder arm 46 to generate friction between the mesh portion 54 and the support member 56, thereby melting the mesh portion 54 and the support member 56 at the mating surfaces 58, 60. The melted mating surfaces 58, 60 of the mesh portion 54 and the tab 56 cool to solidify and form the weld 62.

[0034] In Figure 8 , the welding arm 46 retracts to allow the mesh portions 34, 54 to expand as the welded gasket 30. The weld 62 includes a consistent depth, such as a certain amount of strands 32 beyond the mating surface 60. For example, the amount of strands 32 can be up to three strands 32. The consistent depth of the weld 62 is more consistent and repeatable than an adhesive, which typically drips beyond the mating surface and produces a denser and less consistent bond beyond the lower mating surface. By omitting the adhesive, the gasket 30 is formed from a single consistent material, thus simplifying recyclability.

[0035] The welding gasket 30 provides a lightweight and sustainable comfort solution for the seat assembly 20, thereby reducing the vehicle weight while maintaining occupant support, to reduce costs and improve fuel efficiency. The strands 32 of the mesh portion 54 provide a reduced surface area for bonding. However, compressing the mesh portion 54 enhances the density and area of the mating surface 60 to create the welded portion 62, which is stronger than the adhesive in applicable tests (such as shear resistance). Although one mesh portion 54 and one support member 56 are illustrated as being welded together, any number of mesh portions 54 and support members 56 and any number of welded portions 62 can be employed to fabricate various gaskets 30.

[0036] Various parameters of the welding process can be changed for various specifications or applications. For example, the power, voltage, and current of the welder 44 can be adjusted to regulate the performance of the welded portion 62. Similarly, the adjustment of the proximity of the welding tip 48 to the contact point of the mesh portion 54 and the pressure applied to the support member 56 and the mesh portion 54 by the extension of the welding arm 46 can also change the performance of the welded portion 62. The time of the welded portion 62 can also be changed to alter the performance. At the welder tip 48, the frequency of the tip 48 can be changed for different welding performances. Additionally, the shape of the welder tip 48 can be adjusted to regulate the performance resulting in surface welding, spot welding, etc.

[0037] Various configurations of the mating surfaces 58, 60 can also be employed to achieve different mating configurations. For example, the mating surface 60 of the mesh portion 54 can include an epidermal layer. Additionally, the welded portion 62 can be changed by varying the materials of the mesh portion 54 and the support member 56, adjusting the area of the mating surfaces 58, 60, or changing the amount of the welded portion between the mesh portion 54 and the support member 56. Various materials can include polyethylene, linear low-density polyethylene, high-density polyethylene, polypropylene, polycarbonate, thermoplastic polyester elastomer, acrylonitrile butadiene styrene, polyoxymethylene, etc.

[0038] Referring again to Figure 1 , according to an embodiment, the gasket 30 is installed together with the seat assembly 20 under the trim panel 50 below the trim cover 26. The gasket 30 can be directly welded to the panel 50. Alternatively, the tabs 56 can be attached to the panel 50. In another embodiment, the gasket 30 is installed to the frame 52 by attachment of the panel 56, and the gasket 30 is hidden by the trim cover 26.

[0039] According to a first aspect, a gasket is provided with an integral mesh of expanded thermoplastic resin strands. Welded portions are formed at least partially along the mesh.

[0040] According to a second aspect, there is provided the gasket according to the first aspect, wherein the welded portions are formed at least partially along the surface of the mesh.

[0041] According to a third aspect, there is provided the gasket according to the first aspect or the second aspect, wherein the net is further defined as a first net portion. A second integral net portion of the thermoplastic resin is provided and welded to the first net portion.

[0042] According to a fourth aspect, there is provided the gasket according to the third aspect, wherein the first net portion is further provided with a first net segment. The second net portion is provided with a second net segment.

[0043] According to a fifth aspect, the gasket according to any one of the first aspect to the fourth aspect is provided with a skin welded to the net.

[0044] According to a sixth aspect, the gasket according to any one of the first aspect to the fifth aspect is provided with a first skin integrally bonded to the net. A second skin is welded to the first skin.

[0045] According to a seventh aspect, there is provided the gasket according to any one of the first aspect to the sixth aspect, wherein the welded portion extends as a seam along a region of the net.

[0046] According to an eighth aspect, the gasket according to any one of the first aspect to the seventh aspect is provided with a decorative member welded to the net.

[0047] According to a ninth aspect, there is provided the gasket according to the eighth aspect, wherein the decorative member is further provided with a tab for attachment to another decorative member.

[0048] According to a tenth aspect, there is provided the gasket according to the eighth aspect or the ninth aspect, wherein the net and the decorative member are formed of similar recyclable materials.

[0049] According to an eleventh aspect, the gasket according to any one of the first aspect to the tenth aspect is provided with a support member welded to the net.

[0050] According to a twelfth aspect, there is provided the gasket according to the eleventh aspect, wherein the support member is further provided with a decorative tray.

[0051] According to a thirteenth aspect, there is provided the gasket according to any one of the first aspect to the twelfth aspect, wherein the welded portion is provided with a consistent amount of strands.

[0052] According to a fourteenth aspect, there is provided the gasket according to any one of the first aspect to the thirteenth aspect, wherein the gasket is not provided with an adhesive.

[0053] According to a fifteenth aspect, a seat gasket is provided with the gasket according to any one of the first aspect to the fourteenth aspect.

[0054] According to a sixteenth aspect, a seat assembly is provided with a seat frame. Padding is provided according to any one of the first aspect to the fifteenth aspect.

[0055] According to a seventeenth aspect, a method is provided, the method including welding a first region of a web of expandable thermoplastic resin strands to a second region of a web of thermoplastic resin strands.

[0056] According to an eighteenth aspect, the method according to the seventeenth aspect further includes stacking the first region of the web and the second region of the web before welding.

[0057] According to a nineteenth aspect, the method according to the seventeenth aspect or the eighteenth aspect further includes stacking the first region from a first layer of the web and the second region from a second layer of the web before welding.

[0058] According to a twentieth aspect, the method according to any one of the seventeenth aspect to the nineteenth aspect further includes compressing the first region of the web and the second region of the web before welding.

[0059] According to a twenty - first aspect, the method according to any one of the seventeenth aspect to the twentieth aspect further includes extending a welder to contact the first region or the second region of the web to weld the first region and the second region of the web.

[0060] According to a twenty - second aspect, the method according to the twenty - first aspect further includes retracting the welder after welding the first region and the second region of the web.

[0061] According to a twenty - third aspect, the method according to any one of the seventeenth aspect to the twenty - second aspect further includes ultrasonically welding the first region and the second region of the web.

[0062] According to a twenty - fourth aspect, the method according to any one of the seventeenth aspect to the twenty - third aspect further includes welding the first region of the web to the second region of the web of an integral layer of the web.

[0063] According to a twenty - fifth aspect, the method according to any one of the seventeenth aspect to the twenty - fourth aspect further includes welding the first region of the web to the second region of the web without an adhesive.

[0064] According to a twenty - sixth aspect, the method according to any one of the seventeenth aspect to the twenty - fifth aspect further includes changing the power, voltage, current, welder extension distance or welding frequency of the welder to change the welded portion.

[0065] According to the twenty-seventh aspect, a gasket is formed by the method according to any one of the seventeenth aspect to the twenty-sixth aspect.

[0066] According to the twenty-eighth aspect, a seat cushion is formed by the method according to any one of the seventeenth aspect to the twenty-sixth aspect.

[0067] According to the twenty-ninth aspect, the method according to any one of the seventeenth aspect to the twenty-sixth aspect further includes installing the welded area of the net into the seat assembly.

[0068] According to the thirtieth aspect, a method is provided, which includes welding a first area of a net of expandable thermoplastic resin strands to a decorative component or a support member.

[0069] According to the thirty-first aspect, the method according to the thirtieth aspect further includes compressing the first area of the net before welding.

[0070] According to the thirty-second aspect, the method according to the thirtieth aspect or the thirty-first aspect further includes extending a welding machine to contact the first area of the net to weld the first area and the decorative component or the support member.

[0071] According to the thirty-third aspect, the method according to the thirty-second aspect further includes retracting the welding machine after welding the first area and the decorative component or the support member.

[0072] According to the thirty-fourth aspect, the method according to any one of the thirtieth aspect to the thirty-third aspect further includes ultrasonically welding the first area and the decorative component or the support member.

[0073] According to the thirty-fifth aspect, the method according to any one of the thirtieth aspect to the thirty-fourth aspect further includes welding the first area of the net to the decorative component.

[0074] According to the thirty-sixth aspect, the method according to any one of the thirtieth aspect to the thirty-fifth aspect further includes welding the first area of the net to the support member.

[0075] According to the thirty-seventh aspect, the method according to any one of the thirtieth aspect to the thirty-sixth aspect further includes welding the first area of the net to the decorative component or the support member without an adhesive.

[0076] According to the thirty-eighth aspect, the method according to any one of the thirtieth aspect to the thirty-seventh aspect further includes changing the power, voltage, current, welding machine extension distance, or welding frequency of the welding machine to change the welded part.

[0077] According to the thirty-ninth aspect, a cushion is formed by the method according to any one of the thirtieth aspect to the thirty-eighth aspect.

[0078] According to the fortieth aspect, a seat cushion is formed by the method according to any one of the thirtieth aspect to the thirty-eighth aspect.

[0079] According to the forty-first aspect, the method according to any one of the thirtieth aspect to the thirty-eighth aspect further includes installing the welding area of the net and the decorative member or the support member into the seat assembly.

[0080] Although multiple embodiments are described above, this does not mean that these embodiments describe all possible forms according to the present disclosure. In this regard, the words used in the specification are descriptive rather than restrictive, and it should be understood that various changes can be made without departing from the spirit and scope of the present disclosure. In addition, the features of the various embodiments can be combined to form additional embodiments according to the present disclosure.

Claims

1. A gasket, comprising: an integral web of expanded thermoplastic resin strands; and a welded portion formed at least partially along said web.

2. The gasket according to claim 1, wherein, Said welded portion is formed at least partially along the surface of said web.

3. The gasket according to claim 1 or 2, wherein, Said web is further defined as a first web portion; and wherein said gasket further comprises a second integral web portion of thermoplastic resin welded to said first web portion.

4. The gasket according to claim 3, wherein, Said first web portion further comprises a first web segment; and wherein said second web portion further comprises a second web segment.

5. The gasket according to claim 1 or 2, further comprising a skin welded to said web.

6. The gasket according to claim 1 or 2, further comprising a first skin integrally bonded to said web; and a second skin welded to said first skin.

7. The gasket according to claim 1 or 2, wherein Said welded portion extends as a seam along a region of said web.

8. The gasket according to claim 1 or 2, further comprising a decorative member welded to said web.

9. The gasket according to claim 8, wherein, Said decorative member further comprises a pallet for attachment to another decorative member.

10. The gasket according to claim 8, wherein, Said web and said decorative member are formed of similar recyclable materials.

11. The gasket according to claim 1 or 2, further comprising a support member welded to said web.

12. The gasket according to claim 11, wherein, Said support member further comprises a decorative pallet.

13. The gasket according to claim 1 or 2, wherein Said welded portion comprises a consistent amount of strands.

14. The gasket according to claim 1 or 2, wherein, Said gasket does not contain an adhesive.

15. A seat cushion, comprising the gasket according to claim 1 or 2.

16. A seat assembly, comprising: a seat frame; and the gasket according to claim 1 or 2.

17. A method, comprising: welding a first region of a web of expanded thermoplastic resin strands to a second region of a web of expanded thermoplastic resin strands.

18. The method according to claim 17, further comprising stacking said first region of said web and said second region of said web prior to welding.

19. The method according to claim 17 or 18, further comprising stacking said first region from a first layer of said web and said second region from a second layer of said web prior to welding.

20. The method according to claim 17 or 18, further comprising compressing said first region of said web and said second region of said web prior to welding.

21. The method according to claim 17 or 18, further comprising extending a welder to contact said first region or said second region of said web to weld said first region and said second region of said web.

22. The method according to claim 21, further comprising retracting said welder after welding said first region and said second region of said web.

23. The method according to claim 17 or 18, further comprising ultrasonically welding said first region and said second region of said web.

24. The method according to claim 17 or 18, further comprising welding said first region of said web to said second region of an integral layer of said web.

25. The method according to claim 17 or 18, further comprising welding said first region of said web to said second region of said web without an adhesive.

26. The method according to claim 17 or 18 further comprises changing the power, voltage, current, welding machine extension distance, or welding frequency of the welding machine to change the welded part.

27. A gasket formed by the method according to claim 17 or 18.

28. A seat cushion formed by the method according to claim 17 or 18.

29. The method according to claim 17 or 18 further comprises installing the welded area of the net into a seat assembly.

30. A method comprising: Welding a first area of a net of expandable thermoplastic resin strands to a decorative component or a support member.

31. The method according to claim 30 further comprises compressing the first area of the net before welding.

32. The method according to claim 30 or 31 further comprises extending the welding machine to contact the first area of the net to weld the first area and the decorative component or the support member.

33. The method according to claim 32 further comprises retracting the welding machine after welding the first area and the decorative component or the support member.

34. The method according to claim 30 or 31 further comprises ultrasonically welding the first area and the decorative component or the support member.

35. The method according to claim 30 or 31 further comprises welding the first area of the net to the decorative component.

36. The method according to claim 30 or 31 further comprises welding the first area of the net to the support member.

37. The method according to claim 30 or 31 further comprises welding the first area of the net to the decorative component or the support member without an adhesive.

38. The method according to claim 30 or 31 further comprises changing the power, voltage, current, welding machine extension distance, or welding frequency of the welding machine to change the welded part.

39. A gasket formed by the method according to claim 30 or 31.

40. A seat cushion formed by the method according to claim 30 or 31.

41. The method according to claim 30 or 31 further comprises installing the welded area of the net and the decorative component or the support member into a seat assembly.

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