Patent Application
20070029829
The present invention relates generally to the field of components such as panels or other structures for use in vehicles (e.g., automobiles such as cars, trucks, and the like; airplanes, boats, etc.) and methods of making such components. More specifically, the present invention relates to interior panels or structures for vehicles or other applications that include at least one relatively soft (e.g., padded or cushioned) portion.
Padded or cushioned vehicle interior components such as panels (e.g., instrument panels, door panels, etc.) conventionally include a substrate made of a relatively rigid material, a relatively soft core (e.g., a foam core), and an outer surface or skin. For example, a vehicle door panel may be cushioned to provide added comfort for an occupant of a vehicle when a portion of the occupant's body interfaces or contacts the door panel. Various methods of providing such cushioning are known in the art, although such known methods do not provide certain advantageous features and/or combination of features.
For example, one difficulty in producing panels having cushioned portions is that it may be difficult to optimize the location of the cushioned portions such that the cushioned portions are provided only in areas that are directly interfaced (e.g., contacted) by an individual. For example, certain areas of vehicle interior trim panels are not contacted by passengers such as locations on a door panel proximate the floor of the vehicle. There may be little or no reason to provide cushioned portions of the door panel in such regions. Further, providing cushioned portions or regions in areas where there is no requirement to do so adds unnecessary expense (i.e., material, labor, and equipment) and may also add excess weight to the vehicle.
To provide localized cushioned portions for interior vehicle components, one known method involves coupling a cushioned component to a rigid component. For example, a relatively rigid panel (e.g., a door panel) may have coupled thereto a component that includes a relatively rigid substrate, a relatively soft skin, and a foam interior portion. One difficulty with such a method is that such method requires the use of additional components (e.g., an additional substrate, bolts or other fastening devices to secure the panel substrate to the substrate of the cushioned portion, etc.), which adds both weight and expense to the finished product.
Accordingly, there is a-need to provide a method for producing components such as panels or other structures for use in vehicles that includes a relatively soft or padded portion or section. There is also a need to provide components that have regions of localized cushioning that are optimized based on the location likely to be interfaced by a vehicle occupant or other individual. There is also a need to provide a component that has regions of localized cushioning that has a decreased mass and requires less material than conventional components having cushioned regions. There is also a need to provide an integrally formed vehicle component that includes localized regions of cushioning. There is also a need to provide components and a method for making components that may be manufactured in a relatively simple and efficient manner with reduced manufacturing and material costs. There is also a need to provide a manufacturing method for producing components having one or more cushioned portions that utilizes existing equipment.
Component 10 is provided with one or more localized or discrete areas of softness or cushioning in areas that are interfaced by a passenger or other individual. For example, a door panel such as door panel 710 shown in
The methods of providing localized regions of softness or cushioning in a manner described herein may be utilized to provide components having a wide variety of configurations. For example, a door panel may be provided that includes one or more islands of hard plastic (e.g., bezels, accents, appliques, pull cups, etc.). In another example, complex geometries (e.g., ball armrests, x,y,z boundaries, etc.) may be formed. In yet another example, the door panel may include proud (e.g., raised) or recessed regions of cushioning for enhanced aesthetics.
According to an exemplary embodiment, component 10 includes a member or element in the form of a relatively rigid substrate, base, or stratum 30 (referred to herein as a “substrate” for simplicity). A cushioned or padded member or element 20 is provided adjacent or proximate to at least a portion of substrate 30, and includes a cover or skin 22 and a filler material (see, e.g., filler material 240 shown in
Substrate 30 may be made of any suitable material, including any of a variety of metals (e.g., aluminum, magnesium, metal alloys, etc.) or polymers (e.g., polypropylene, polyethylene, copolymers, etc.). Substrate 30 may be formed in any of a wide variety of shapes, sizes, and configurations (see, e.g., the embodiment shown in
According to an exemplary embodiment, cushioned member 20 is provided above or over at least a portion of substrate 30. Skin 22 forms at least a portion of an exterior surface 12 (e.g., the portion visible from a passenger compartment, which is typically be referred to as the “A” surface, etc.) of component 10. According to an exemplary embodiment, a portion of substrate 30 forms a portion of exterior surface 12. A boundary 24 between substrate 30 and the skin 22 may be provided (e.g., in the form of an interface, seam, or joint). Boundary 24 may be visible at exterior surface 12 or may be filled in with a material to provide a “seamless” look for component 10.
According to an exemplary embodiment, skin 22 is made of a relatively soft or flexible material comprising a polymeric material (e.g., polyurethane, polyvinylchloride (PVC), a thermoplastic olefin (TPO), etc.). According to other exemplary embodiments, the skin may be made of other materials, including textiles such as cloth, leather, composite materials, layered materials (e.g., a layer of leather applied above a polymeric material layer), etc.
According to a preferred embodiment, skin 22 is provided on substrate 30 in such a manner that a space or void (e.g., a cavity or gap) (see, e.g., space 216 shown in
A material (e.g., a filler material) such as material 240 shown in
According to an exemplary embodiment, skin 22 is manufactured or produced utilizing a slush molding process. In a slush molding process, a thermoplastic material in a liquid or powdered form is introduced into a temperature-controlled mold to form a viscous skin adjacent to the mold walls. Once the skin is formed, the excess material is removed from the mold and the skin is allowed to cure and cool, after which the skin is removed from the mold. One advantage of utilizing a slush molding process is that it is relatively inexpensive and efficient in producing relatively complex skin geometries.
According to another exemplary embodiment, skin 22 is manufactured or produced utilizing a vacuum forming process. In a vacuum molding process, a pre-cut or formed sheet of polymeric material is provided in a mold and heated to soften the material. A vacuum is applied to the mold, which draws the softened polymeric material toward the walls of the mold. The polymeric material then cools and maintains the shape defined by the mold walls.
According to other exemplary embodiments, skin 22 may be manufactured according to various other methods. For example, skin 22 may be formed in an injection molding process, an extrusion process, a casting process (e.g., gravity casting), or any other suitable process for forming a polymeric skin.
According to an exemplary embodiment in which skin 22 is made of a polymeric material, skin 22 has a thickness of between approximately 0.5 and 3.0 millimeters, and most preferably between approximately 1.0 and 1.5 millimeters.
Skin 22 may have a size, shape, and configuration that is adapted or configured to features included in the substrate. According to one exemplary embodiment (shown, e.g., in
As shown in
Skin 22 and/or substrate 30 may include features configured to couple at least a portion of skin to the substrate 30. The coupling may be accomplished by way of a mechanical interconnection (e.g., a friction or interference fit) or by other mechanisms. According to an exemplary embodiment, the skin is coupled to the substrate in a maimer that provides a relatively airtight and/or watertight seal between the skin and the substrate.
Any of a variety of configurations may be utilized for the protrusion and channel, several nonexclusive examples of which are shown in the accompanying FIGURES. The protrusion may be formed on the skin by forming a portion of the skin in the mold (e.g., to provide an edge of the skin with a “folded back” configuration to form a protrusion) or by forming the protrusion after the skin is removed from the mold. The protrusion may be integral to the skin or may be produced separately and secured thereto by an adhesive or other fastener. The position of the protrusion and the channel may be reversed, such that a channel is formed in at least a portion of the skin and one or more protrusions are formed in the substrate, such that the protrusion(s) of the substrate may be inserted into the channel(s) formed in the skin to produce a mechanical seal between the skin and substrate.
One or both of protrusion 226 and the walls or surfaces of channel 234 may be relatively flexible and/or resilient such that insertion of protrusion 226 into channel 234 causes one or both of protrusion 226 and the walls or surface of 234 to bend or flex. Upon insertion of protrusion 226 into channel 234, the flexible and/or resilient component may return to its pre-insertion state to couple skin 222 to substrate 230.
According to an exemplary embodiment, skin 222 and substrate 230 are coupled together such that a relatively airtight and/or watertight seal is provided. In one example, skin 222 includes a protrusion that extends substantially entirely about the periphery of skin 222 and substrate 230 includes a channel 234 that extends substantially entirely about the periphery of the area over which skin 222 is provided. Protrusion 226 is pressed or positioned into channel 234 to form a seal about substantially the entire periphery of skin 222 to form a seal. According to an exemplary embodiment, one or both of protrusion 226 and channel 234 may extend only partially about their periphery to provide local sealing of skin 222 to substrate 230 (e.g., the skin may include a plurality of protrusions that are provided intermittently about the periphery of the skin). Various sizes, shapes, and configurations may be used for the protrusion and the channel to couple the skin to the substrate.
According to another exemplary embodiment, the skin includes one or more features (e.g., protrusions) that are drawn into an opening such as a groove, channel, or other structure provided in the substrate by way of a vacuum or other pressure or force. For example, the skin may include one or more protrusions that extend at least a portion of the way about the periphery of the skin, and the protrusions may be inserted into an opening provided in the substrate. In such an embodiment, the skin is held in place by application of a vacuum that removes the air between the protrusions and the walls of the opening. In this manner, a relatively airtight and/or watertight seal may be formed between the skin and the substrate.
In contrast to the embodiment shown in
According to another exemplary embodiment of a component 510 shown in
According to yet another exemplary embodiment, both mechanical fastening features (e.g., interference fit protrusion(s) and channel(s)) and vacuum coupling features may be provided. According to such an embodiment, the skin includes one or more protrusions that fit into one or more openings to mechanically secure the skin to the substrate, and the substrate also includes one or more apertures to allow suction by a vacuum to secure the skin to the substrate. In any of the exemplary embodiments illustrated in
Once skin 322 is secured to substrate 330 by vacuum and/or mechanical means, foam or other filler material 340 is introduced into cavity 316 through a fill tube or nozzle 360 (e.g., by injection or gravity pouring). Fill tube 360 is coupled to an opening or aperture 336 formed in a portion of substrate 330 to allow introduction of the filler material 340 into cavity 316. Because skin 322 is coupled to substrate 330 in a relatively airtight and/or watertight manner (e.g., by way of the vacuum and/or mechanical coupling mechanisms), filler material 340 does not escape into vacuum box 350 through apertures 338. While the embodiment shown in
The numbers, size, shape, and configuration of apertures for allowing vacuum suction and for coupling to the fill tube may vary according to other exemplary embodiments. For example, more than one fill tube may be coupled to the substrate in various locations, and more than one aperture may be provided for coupling to such fill tubes. The various features of the apertures may be optimized according to various considerations, including manufacturability, cost, and other considerations.
According to an exemplary embodiment, the skin is coupled to the substrate in a manner that does not require the use of a vacuum (e.g., a mechanical interlock or coupling between a portion of the skin and a portion of the substrate). In such an embodiment, the vacuum boxes (
According to an exemplary embodiment, a method of producing a component having one or more cushioned regions includes inserting or providing a substrate or a portion thereof in a mold or other tooling such as a foam-in-place (FIP) tool having a clamshell configuration. One preferred tool is a composite/aluminum tool manufactured by EPW, Inc. of Elkhart, Ind. The substrate is provided in the mold such that the “A” side or exterior surface portion faces outward (i.e., the rear portion of the substrate is in contact with the mold walls).
The skin (e.g., a slush molded or vacuum molded polymeric skin) is coupled to the substrate in one or more locations via mechanical and/or vacuum means. For example, the skin may be coupled to the substrate by inserting protrusions formed on the skin into openings such as channels or grooves formed in the substrate to mechanically couple the skin to the substrate. According to various embodiments, a vacuum may be drawn to secure the skin to the substrate in addition to or in place of the mechanical coupling (e.g., utilizing one or more vacuum apertures formed in the substrate).
Once the skin is secured to the substrate, the mold or tooling is closed. Foam or another filler material is introduced in one or more cavities formed between or intermediate the skin and the substrate to provide a relatively soft or cushioning material. One or more fill tubes or other devices are coupled to an aperture formed in the substrate that provides an entry point into the one or more cavities provided between the skin and substrate. One or more vent holes may also be provided in the substrate to reduce the amount of carbon dioxide or other gas accumulating within the component during the filling operation.
The component comprising the skin, substrate, and foam is then removed from the mold or tooling. The skin is coupled to the substrate both by mechanical means (e.g., protrusion and opening coupling) and by the interaction between the filler material and the skin and substrate. For example, a bond may be formed between the skin and foam provided in a cavity. According to an alternative embodiment, an adhesive may be provided on one or both of the substrate and the skin on the interior of the cavity to bond the foam thereto.
Various process steps may also be utilized in addition to or in place of those described above. For example, it may be necessary to seal or close one or more apertures provided in the substrate subsequent to the filling operation (e.g., to prevent foam or filler material from escaping). In another example, the mold may be rotated after inserting the skin and substrate into the mold and closing the mold prior to filling the cavity or cavities with filler material.
The various teachings of the present disclosure may be used to form components having a wide variety of geometries and complexity.
Members 720, 722 and 724 may be made at the same time or in a sequential manufacturing method, and may be made from the same or different materials (e.g., member 720 may have a different skin and/or filler material than is used for members 722 and 724; for example, the skin color of member 720 may differ for aesthetic reasons and/or member 720 may utilize different materials because member 720 is likely to receive a great deal of driver or passenger contact (e.g., the driver or passenger may rest an elbow or arm on member 720)).
The construction and arrangement of the elements of the vehicle component as shown in the various exemplary embodiments is illustrative only. Although only a few embodiments of the present inventions have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters, mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter recited herein (e.g., the color of the skin may differ from that of the substrate or may be substantially the same color as the substrate). For example, elements shown as integrally formed may be constructed of multiple parts or elements (e.g., protrusions extending from the skin to couple the skin to the substrate may be integrally formed with the skin or produced separately and coupled or adhered to the skin), the position of elements may be reversed or otherwise varied (e.g., protrusions may be provided in the substrate to engage an opening such as a channel or groove formed in the skin), and the nature or number of discrete elements or positions may be altered or varied (e.g., the number of apertures provided in the substrate for receiving a filler material may differ according to any of a number of considerations). It should be noted that the elements and/or assemblies of the system may be constructed from any of a wide variety of materials that provide sufficient strength or durability, including any of a wide variety of moldable plastic materials (such as high-impact plastic) in any of a wide variety of colors, textures and combinations. Components such as those shown herein may be used in non-vehicle applications as well, including but not limited to furniture such as chairs, desks, benches, and other furniture items. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the preferred and other exemplary embodiments without departing from the scope of the present invention.
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/US04/16467 | 5/26/2004 | WO | 4/11/2006 |
| Number | Date | Country | |
|---|---|---|---|
| 60511988 | Oct 2003 | US |
