WO2001044025A1 - Hidden filament assisted opening system for an airbag cover - Google Patents

Hidden filament assisted opening system for an airbag cover Download PDF

Info

Publication number
WO2001044025A1
WO2001044025A1 PCT/CA2000/001470 CA0001470W WO0144025A1 WO 2001044025 A1 WO2001044025 A1 WO 2001044025A1 CA 0001470 W CA0001470 W CA 0001470W WO 0144025 A1 WO0144025 A1 WO 0144025A1
Authority
WO
WIPO (PCT)
Prior art keywords
contaminant
skin
interior automotive
automotive panel
polyurethane
Prior art date
Application number
PCT/CA2000/001470
Other languages
French (fr)
Inventor
Robert S. Sevigny
Alan Robert Deeks
Original Assignee
Magna Interior Systems, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Magna Interior Systems, Inc. filed Critical Magna Interior Systems, Inc.
Priority to CA002394080A priority Critical patent/CA2394080A1/en
Priority to US10/168,150 priority patent/US6945555B2/en
Priority to AU18481/01A priority patent/AU1848101A/en
Priority to EP00981119A priority patent/EP1237763A1/en
Publication of WO2001044025A1 publication Critical patent/WO2001044025A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/20—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components
    • B60R21/215—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components characterised by the covers for the inflatable member
    • B60R21/2165—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components characterised by the covers for the inflatable member characterised by a tear line for defining a deployment opening

Definitions

  • the subject invention relates to an interior panel cover for concealing an airbag module.
  • One method of concealing the air bag and still allow for uninhibited air bag inflation is to cover the air bag system with a textured skin designed to tear or break away during air bag deployment.
  • the skin appears complete and intact to a passenger, but contains hidden weak points that tear under the trauma of an air bag deployment.
  • Current methods to create a weakened area in the textured skin include the use of secondary stamping, perforating or cutting operations which are costly and sometimes inaccurate.
  • the subject invention improves on these methods by utilizing an encapsulated filament or contaminant to create weakened points within the textured skin.
  • the disadvantages of the prior art may be overcome by providing a hidden air bag assist system that covers an interior automotive panel.
  • the system includes a skin having inner and outer sides.
  • a liquid contaminant or a filament is disposed within the skin such that the contaminant or filament is not visible through the outer side.
  • the contaminant or filament creates a weakened area within the skin and defines a passageway for allowing an air bag to deploy therethrough.
  • Figure 1 is a side view of a filament imbedded in the textured skin
  • Figure 2 is a planer view showing the filament imbedded in the textured skin
  • Figure 3 perspective view of the alternate embodiment with the filament ends extending outward from the textured skin.
  • the hidden air bag assist system 10 includes a skin 12 formed from sprayed two part polyurethane utilizing a water-dispersed polyurethane in-mold coating, as described in U.S. patent numbers 5,885,662; 6,013,210; 6,017,617 with an encapsulated contaminant 14.
  • the in-mold coating is an aliphatic thermoplastic polyurethane and the two part polyurethane is aromatic.
  • the skin 12 is designed to cover a vehicle interior panel, such as an instrument panel or a door panel, thereby concealing an air bag module.
  • air bag modules typically include an air bag and an air bag canister.
  • the encapsulated contaminant 14 is not visible through the outer surface of the skin 12 to passengers seated within the vehicle. In other words, during normal operating conditions, the air bag module is concealed behind the skin covered interior panel.
  • the encapsulated contaminant 14 defines a passageway 16 through which the air bag deploys.
  • the contaminant 14 is a liquid.
  • contaminant 14 could be in the form of a gel or paste.
  • the liquid contaminant 14 may comprise any liquid which once cured is compatible with the polyurethane skin 12.
  • the type of liquid contaminant 14 is limited only to liquids that will not deteriorate or destroy the polyurethane skin 12 during fabrication or after the skin 12 is formed.
  • the liquid 14 must have a viscosity that prevents the liquid from flowing across the face of the skin 12 in an uncontrolled manner during deposit.
  • the liquid contaminant 14 may form an adhesive bond with the polyurethane skin 12 but inhibits any cross linking between layers of polyurethane skin 12.
  • a bead of liquid contaminant 14 is deposited during molding of the skin 12. Specifically, the liquid contamiiant 14 is applied in the outline of a desired or predetermined pattern on a first layer of the sprayed polyurethane skin 12, comprising an in-mold coating and a polyurethane layer. Subsequent layers of the polyurethane skin 12 are applied over the initial first layer and the liquid contaminant 14. Once the liquid contaminant 14 cures to a solid or semi-solid state, it creates a specific localized area of two or more thin layers instead of one thick layer. Multiple thin layers tear or rip easier than one thick layer allowing the air bag to pass through the outlined passageway 16. Thus, the contaminant 14 defines a frangible line for airbag deployment.
  • the liquid contaminant may be formed of a polyurethane which is similar to the polyurethane used to create the polyurethane skin 12.
  • the polyurethane contaminant 14 must form a weakened bond with the polyurethane skin 12 than the bond between the layers of the polyurethane skin 12 itself.
  • a liquid contaminant 14 that cures to a flexible solid or semi-solid state and forms an adhesive or relatively weaker bond (urethane liquid contaminant) with the polyurethane skin 12 provides some specific advantages over the use of a non-bonding contaminant.
  • the bonding liquid contaminant would improve the visual appearance and durability of the skin by making any passageway 16 invisible to a passenger.
  • the non- bonding liquid contaminant 14 may cause a depression or visible outline of the passageway 16 after prolonged exposure to the environment. Further, the non-bonding liquid contaminant 14 may age differently than the surrounding polyurethane skin 12, possibly causing the outline of the passageway 16 to become visible over time.
  • Encapsulation of either the liquid contaminant 14 within the polyurethane skin 12 is preferably accomplished during the spray polyurethane forming process.
  • a mold (not shown) having a textured surface is used to form the skin 12 with the encapsulated liquid or filament contaminant 14.
  • the textured surface of the mold creates the look and feel desired of the outer side 22 of the skin 12.
  • the polyurethane is sprayed in a sweeping motion across the mold to form an initial layer.
  • the contaminant is then deposited on the initial layer.
  • methods currently known in the art may be utilized to apply the liquid contaminant 14 to the sprayed polyurethane skin 12. The method will vary dependent only upon manufacturing necessities and individual customer requirements.
  • the means of placing the contaminant 14 within the sprayed polyurethane skin 12 could include robotic methods that can dispense a liquid contaminant 14 in a specified pattern, which are commonly used for hidden air bag covers.
  • a second layer of sprayed polyurethane is then applied to encapsulate the contaminant 14. Once the skin 12 has been allowed to cure, the skin 12 is then de-molded for further processing. The loose ends of the contaminant 14 can be trimmed or held in a manner which does not interfere with subsequent processing or the deployment of the airbag.
  • the liquid contaminant is cured to a solid or flexible state prior to the application to the initial layer of the polyurethane skin 12.
  • the liquid contaminant 14 becomes a filament which is applied to the skin 12.
  • Preferred materials include organic polymeric materials, including nylon, polypropylene, and polyethylene.
  • a fixture is required to retain the filament in place and tensioned during the application of the second layer. The fixture also ensures that the filament 14 is properly positioned within the skin 12.
  • the skin 12 with an encapsulated contaminant 14 is formed as described above. However, prior to subsequent processing, the contaminant 14 is removed to form either two unattached layers of the skin 12 along the predetermined line or a single layer with the inner layer of the skin 12 ripped along the frangible line, leaving the outer layer to conceal the frangible line.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Air Bags (AREA)

Abstract

A hidden air bag assist includes a skin (12) having inner and outer sides. A liquid contaminant (14) is disposed within the skin (12) such that the contaminant (14) is not visible through the outer side. The contaminant (14) creates a weakened area or frangible line within the skin and defines a passageway for allowing an airbag to deploy therethrough.

Description

HIDDEN FILAMENT ASSISTED OPENING SYSTEM FOR AN AIRBAG COVER
Field of Invention
The subject invention relates to an interior panel cover for concealing an airbag module.
Background of The Invention
Traditionally, air bags installed in a vehicle interior are concealed from the view of a passenger by panels or covers. These panels or covers are designed to conceal the air bag during normal vehicle operation, but still allow the air bag to inflate into the passenger compartment with little restriction in an emergency situation.
One method of concealing the air bag and still allow for uninhibited air bag inflation is to cover the air bag system with a textured skin designed to tear or break away during air bag deployment. The skin appears complete and intact to a passenger, but contains hidden weak points that tear under the trauma of an air bag deployment. Current methods to create a weakened area in the textured skin include the use of secondary stamping, perforating or cutting operations which are costly and sometimes inaccurate. The subject invention improves on these methods by utilizing an encapsulated filament or contaminant to create weakened points within the textured skin.
Summary of the Invention
The disadvantages of the prior art may be overcome by providing a hidden air bag assist system that covers an interior automotive panel. The system includes a skin having inner and outer sides. A liquid contaminant or a filament is disposed within the skin such that the contaminant or filament is not visible through the outer side. The contaminant or filament creates a weakened area within the skin and defines a passageway for allowing an air bag to deploy therethrough.
Brief Description of the Drawings Advantages of the present invention will be readily appreciated as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings wherein:
Figure 1 is a side view of a filament imbedded in the textured skin; Figure 2 is a planer view showing the filament imbedded in the textured skin; Figure 3 perspective view of the alternate embodiment with the filament ends extending outward from the textured skin.
Detailed Description of the Preferred Embodiment
Referring to the Figures wherein like numerals indicate like or corresponding parts throughout the several views, a hidden air bag assist system is generally shown at 10. The hidden air bag assist system 10 includes a skin 12 formed from sprayed two part polyurethane utilizing a water-dispersed polyurethane in-mold coating, as described in U.S. patent numbers 5,885,662; 6,013,210; 6,017,617 with an encapsulated contaminant 14. Preferably, the in-mold coating is an aliphatic thermoplastic polyurethane and the two part polyurethane is aromatic. The skin 12 is designed to cover a vehicle interior panel, such as an instrument panel or a door panel, thereby concealing an air bag module. As appreciated, air bag modules typically include an air bag and an air bag canister. The encapsulated contaminant 14 is not visible through the outer surface of the skin 12 to passengers seated within the vehicle. In other words, during normal operating conditions, the air bag module is concealed behind the skin covered interior panel. The encapsulated contaminant 14 defines a passageway 16 through which the air bag deploys.
In the preferred embodiment of the present invention, the contaminant 14 is a liquid. Alternatively, contaminant 14 could be in the form of a gel or paste. The liquid contaminant 14 may comprise any liquid which once cured is compatible with the polyurethane skin 12. Generally the type of liquid contaminant 14 is limited only to liquids that will not deteriorate or destroy the polyurethane skin 12 during fabrication or after the skin 12 is formed. Additionally, the liquid 14 must have a viscosity that prevents the liquid from flowing across the face of the skin 12 in an uncontrolled manner during deposit. The liquid contaminant 14 may form an adhesive bond with the polyurethane skin 12 but inhibits any cross linking between layers of polyurethane skin 12.
A bead of liquid contaminant 14 is deposited during molding of the skin 12. Specifically, the liquid contamiiant 14 is applied in the outline of a desired or predetermined pattern on a first layer of the sprayed polyurethane skin 12, comprising an in-mold coating and a polyurethane layer. Subsequent layers of the polyurethane skin 12 are applied over the initial first layer and the liquid contaminant 14. Once the liquid contaminant 14 cures to a solid or semi-solid state, it creates a specific localized area of two or more thin layers instead of one thick layer. Multiple thin layers tear or rip easier than one thick layer allowing the air bag to pass through the outlined passageway 16. Thus, the contaminant 14 defines a frangible line for airbag deployment.
In addition, the liquid contaminant may be formed of a polyurethane which is similar to the polyurethane used to create the polyurethane skin 12. The polyurethane contaminant 14 must form a weakened bond with the polyurethane skin 12 than the bond between the layers of the polyurethane skin 12 itself.
The use of a liquid contaminant 14 that cures to a flexible solid or semi-solid state and forms an adhesive or relatively weaker bond (urethane liquid contaminant) with the polyurethane skin 12 provides some specific advantages over the use of a non-bonding contaminant. The bonding liquid contaminant would improve the visual appearance and durability of the skin by making any passageway 16 invisible to a passenger. The non- bonding liquid contaminant 14 may cause a depression or visible outline of the passageway 16 after prolonged exposure to the environment. Further, the non-bonding liquid contaminant 14 may age differently than the surrounding polyurethane skin 12, possibly causing the outline of the passageway 16 to become visible over time.
Encapsulation of either the liquid contaminant 14 within the polyurethane skin 12 is preferably accomplished during the spray polyurethane forming process. A mold (not shown) having a textured surface is used to form the skin 12 with the encapsulated liquid or filament contaminant 14. The textured surface of the mold creates the look and feel desired of the outer side 22 of the skin 12. The polyurethane is sprayed in a sweeping motion across the mold to form an initial layer.
The contaminant is then deposited on the initial layer. As appreciated, methods currently known in the art may be utilized to apply the liquid contaminant 14 to the sprayed polyurethane skin 12. The method will vary dependent only upon manufacturing necessities and individual customer requirements. The means of placing the contaminant 14 within the sprayed polyurethane skin 12 could include robotic methods that can dispense a liquid contaminant 14 in a specified pattern, which are commonly used for hidden air bag covers. A second layer of sprayed polyurethane is then applied to encapsulate the contaminant 14. Once the skin 12 has been allowed to cure, the skin 12 is then de-molded for further processing. The loose ends of the contaminant 14 can be trimmed or held in a manner which does not interfere with subsequent processing or the deployment of the airbag. In a second embodiment of the invention, the liquid contaminant is cured to a solid or flexible state prior to the application to the initial layer of the polyurethane skin 12. The liquid contaminant 14 becomes a filament which is applied to the skin 12. Preferred materials include organic polymeric materials, including nylon, polypropylene, and polyethylene. A fixture is required to retain the filament in place and tensioned during the application of the second layer. The fixture also ensures that the filament 14 is properly positioned within the skin 12.
In a third embodiment of the invention, the skin 12 with an encapsulated contaminant 14 is formed as described above. However, prior to subsequent processing, the contaminant 14 is removed to form either two unattached layers of the skin 12 along the predetermined line or a single layer with the inner layer of the skin 12 ripped along the frangible line, leaving the outer layer to conceal the frangible line.
The invention has been described in an illustrative manner, and it is to be understood that the terminology, which has been used, is intended to be in the nature of words of description rather than of limitation. Many modifications and variations of the present invention are possible in light of the above teachings. It is, therefore, to be understood that the invention may be practiced otherwise than as specifically described.

Claims

WHAT IS CLAIMED IS:
1. An interior automotive panel comprising; a skin having inner and outer sides; and a contaminant deposited along a predetermined line within said skin, said predetermined line forming a frangible line outlining a passageway for enabling an air bag to deploy therethrough.
2. An interior automotive panel as claimed in claim 1 wherein said skin comprises a polyurethane material.
3. An interior automotive panel as claimed in claim 2 wherein said skin is formed by spraying at least two polyurethane layers and said contaminant is deposited between said layers.
4. An interior automotive panel as claimed in claim 3 wherein said contaminant is not visible from said outer side.
5. An interior automotive panel as claimed in claim 4 wherein said contaminant is in a liquid state when said contaminant is deposited along said predetermined line.
6. An interior automotive panel as claimed in claim 4 wherein said contaminant is in a solid state when said contaminant is deposited along said predetermined line.
7. An interior automotive panel as claimed in claim 4 wherein said contaminant is in a semi-solid state when said contaminant is deposited along said predetermined line.
8. An interior automotive panel as claimed in claims 5, 6 or 7, wherein said contaminant is compatible with said polyurethane.
9. An interior automotive panel as claimed in claim 8, wherein said contaminant inhibits cross linking between said layers along said predetermined line.
10. An interior automotive panel as claimed in claim 9, wherein said contaminant is an organic polymeric material.
11. An interior automotive panel as claimed in claim 10, wherein said outer layer includes a polyurethane outer surface formed from a sprayed in-mold coating.
12. An interior automotive panel as claimed in claim 10 wherein said organic polymeric material is selected from a group comprising: nylon, polypropylene and polyethylene.
13. An interior automotive panel as claimed in claim 12 wherein said organic polymeric material is nylon.
14. An interior automotive panel as claimed in claim 10 wherein said organic polymeric material is polypropylene.
15. An interior automotive panel comprising; a skin having inner and outer sides, said skin having a frangible line outlining a passageway for enabling an air bag to deploy therethrough, said frangible line formed by depositing a contaminant along a predetermined line within said skin, said predetermined line forming said frangible line.
16. An interior automotive panel as claimed in claim 15 wherein said skin is formed by spraying at least two polyurethane layers and said contaminant is deposited between said layers.
17. An interior automotive panel as claimed in claim 16 wherein said contaminant is not visible from said outer side.
18. An interior automotive component as claimed in claim 17 wherein said contaminant is removed.
19. An interior automotive panel as claimed in claim 18 wherein said contaminant is in a solid state when said contaminant is deposited along said predetermined line.
20. An interior automotive panel as claimed in claim 19 wherein said contaminant is an organic polymeric material selected from a group comprising: nylon, polypropylene and polyethylene.
PCT/CA2000/001470 1999-12-14 2000-12-13 Hidden filament assisted opening system for an airbag cover WO2001044025A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CA002394080A CA2394080A1 (en) 1999-12-14 2000-12-13 Hidden filament assisted opening system for an airbag cover
US10/168,150 US6945555B2 (en) 1999-12-14 2000-12-13 Hidden filament assisted opening system for an airbag cover
AU18481/01A AU1848101A (en) 1999-12-14 2000-12-13 Hidden filament assisted opening system for an airbag cover
EP00981119A EP1237763A1 (en) 1999-12-14 2000-12-13 Hidden filament assisted opening system for an airbag cover

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US17055799P 1999-12-14 1999-12-14
US60/170,557 1999-12-14

Publications (1)

Publication Number Publication Date
WO2001044025A1 true WO2001044025A1 (en) 2001-06-21

Family

ID=22620342

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CA2000/001470 WO2001044025A1 (en) 1999-12-14 2000-12-13 Hidden filament assisted opening system for an airbag cover

Country Status (5)

Country Link
US (1) US6945555B2 (en)
EP (1) EP1237763A1 (en)
AU (1) AU1848101A (en)
CA (1) CA2394080A1 (en)
WO (1) WO2001044025A1 (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4991869A (en) * 1989-10-02 1991-02-12 General Motors Corporation Cover assembly for occupant restraint system
EP0595374A1 (en) * 1989-07-14 1994-05-04 Tip Engineering Group, Inc. Arrangement for forming an air bag deployment opening
EP0639481A1 (en) * 1993-08-18 1995-02-22 Tip Engineering Group, Inc. Method and treatment for forming an air bag deployment opening in leather covered trim
WO1998057790A1 (en) * 1997-06-16 1998-12-23 Magna Interior Systems Inc. Decorative automotive interior trim articles with cast integral light stable covering containing an invisible tear seam and process for making the same
US5863064A (en) * 1997-08-14 1999-01-26 Textron Autmotive Company Inc. Skin for automotive air bag cover panel formed by casting different plastic materials
US5885662A (en) 1997-01-31 1999-03-23 Atoma International, Inc. Decorative automotive interior trim articles with integral light stable polyurethane elastomer covering and process for making the same
US6013210A (en) 1997-04-18 2000-01-11 Magna Interior Systems Inc. Process for making decorative automotive interior trim articles with cast integral light stable covering

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Publication number Priority date Publication date Assignee Title
US5080393A (en) * 1989-01-30 1992-01-14 Tip Engineering Group, Inc. Method and apparatus for forming an air bag deployment opening
US5797619A (en) * 1989-01-30 1998-08-25 Tip Engineering Group, Inc. Automotive trim piece and method to form an air bag opening
US5217244A (en) * 1989-07-14 1993-06-08 Tip Engineering Group Arrangement for forming an air bag deployment opening
US4991870A (en) * 1989-08-28 1991-02-12 Tip Engineering Group, Inc. Method and arrangement for forming an air bag deployment opening in an auto interior trim piece
DE4029940A1 (en) 1990-09-21 1992-03-26 Kugelfischer G Schaefer & Co Spring damper for belt tightening system - consists of annular segment(s)swivelable in region of peripheral face
US5390950A (en) * 1993-03-04 1995-02-21 Tip Eng Group Inc Method and arrangement for forming an air bag deployment opening in an auto interior trim piece
US5478106A (en) * 1994-07-22 1995-12-26 Tip Engineering Group, Inc. Method and arrangement for forming an air bag deployment opening
US5431435A (en) * 1994-09-26 1995-07-11 Davidson Textron Inc. Door panel air bag cover
US5560646A (en) * 1995-04-24 1996-10-01 Davidson Textron Air bag door arrangement
FR2742497B1 (en) 1995-12-18 1998-04-03 Aerospatiale MAGNETIC BEARING WITH ALTERNATE ACTUATORS AND SENSORS
US6753057B1 (en) * 1998-09-14 2004-06-22 Magna Interior Systems, Inc. Trim articles with light stable covering containing invisible tear seam, and process of making the same
US7135213B2 (en) * 2003-07-31 2006-11-14 3M Innovative Properties Company Tearable elastic composite article and method of manufacture

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0595374A1 (en) * 1989-07-14 1994-05-04 Tip Engineering Group, Inc. Arrangement for forming an air bag deployment opening
US4991869A (en) * 1989-10-02 1991-02-12 General Motors Corporation Cover assembly for occupant restraint system
EP0639481A1 (en) * 1993-08-18 1995-02-22 Tip Engineering Group, Inc. Method and treatment for forming an air bag deployment opening in leather covered trim
US5885662A (en) 1997-01-31 1999-03-23 Atoma International, Inc. Decorative automotive interior trim articles with integral light stable polyurethane elastomer covering and process for making the same
US6017617A (en) 1997-01-31 2000-01-25 Atoma International, Inc. Decorative automotive interior trim articles with integral light stable polyurethane elastomer covering and process for making the same
US6013210A (en) 1997-04-18 2000-01-11 Magna Interior Systems Inc. Process for making decorative automotive interior trim articles with cast integral light stable covering
WO1998057790A1 (en) * 1997-06-16 1998-12-23 Magna Interior Systems Inc. Decorative automotive interior trim articles with cast integral light stable covering containing an invisible tear seam and process for making the same
US5863064A (en) * 1997-08-14 1999-01-26 Textron Autmotive Company Inc. Skin for automotive air bag cover panel formed by casting different plastic materials

Also Published As

Publication number Publication date
CA2394080A1 (en) 2001-06-21
US20030141707A1 (en) 2003-07-31
US6945555B2 (en) 2005-09-20
AU1848101A (en) 2001-06-25
EP1237763A1 (en) 2002-09-11

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