Source: http://www.google.com/patents/US6352283
Timestamp: 2017-02-21 22:12:56
Document Index: 106980940

Matched Legal Cases: ['art 14', 'art 16', 'arts 14', 'arts 14', 'arts 14', 'arts 14', 'art 18', 'arts 14', 'arts 14']

Patent US6352283 - Gas bag restraint system - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA gas bag restraint system includes a multi-stage inflator and a gas bag in flow connection therewith. The gas bag comprises a first and a second fabric part which are at least approximately congruent, and a fabric strip which is stitched to an edge of the first fabric part and to an edge of the second...http://www.google.com/patents/US6352283?utm_source=gb-gplus-sharePatent US6352283 - Gas bag restraint systemAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS6352283 B1Publication typeGrantApplication numberUS 09/359,027Publication dateMar 5, 2002Filing dateJul 22, 1999Priority dateJul 22, 1998Fee statusLapsedAlso published asDE29813082U1, DE59912970D1, EP0974498A2, EP0974498A3, EP0974498B1Publication number09359027, 359027, US 6352283 B1, US 6352283B1, US-B1-6352283, US6352283 B1, US6352283B1InventorsNorbert Ellerbrok, Gerd Jürgens, Gianula Knödler, Swen SchaubOriginal AssigneeTrw Occupant Restraint Systems Gmbh & Co. KgExport CitationBiBTeX, EndNote, RefManPatent Citations (11), Referenced by (36), Classifications (8), Legal Events (5) External Links: USPTO, USPTO Assignment, EspacenetGas bag restraint system
US 6352283 B1Abstract
A gas bag restraint system includes a multi-stage inflator and a gas bag in flow connection therewith. The gas bag comprises a first and a second fabric part which are at least approximately congruent, and a fabric strip which is stitched to an edge of the first fabric part and to an edge of the second fabric part. At least one burst seam is provided which in an intact condition forms a fold as a result of which the volume of the gas bag is reduced as compared to a condition in which the burst seam is destroyed. The fold formed by the burst seam is arranged in the fabric strip.
What is claimed is: 1. A gas bag restraint system including a multi-stage inflator and a gas bag in flow connection therewith, said gas bag comprising a first fabric part and a second fabric part separate from said first fabric part, said first and second fabric parts being at least approximately congruent, and a fabric strip which is stitched to an entirety of a circumferential edge of said first fabric part and to an entirety of a circumferential edge of said second fabric part, at least one burst seam being provided which in an intact condition forms a fold as a result of which the volume of said gas bag is reduced as compared to a condition in which said burst seam is destroyed, said fold formed by said burst seam being arranged in said fabric strip.
2. The gas bag of claim 1, wherein said first and said second fabric parts are circular.
3. The gas bag of claim 1, wherein said burst seam connects said first and said second fabric parts to each other.
4. The gas bag of claim 1, wherein said burst seam runs through said fabric strip.
5. The gas bag of claim 1, wherein said fold is arranged in the interior of said gas bag.
6. The gas bag of claim 1, wherein said fold is arranged outside of said gas bag.
7. The gas bag of claim 1, wherein several burst seams are provided which are destroyable one after the other.
8. The gas bag of claim 1, wherein said first and said second fabric parts are oval or elliptical in shape.
Gas bag restraint systems exist which include a multi-stage inflator and a gas bag in flow connection therewith, the gas bag comprising a first and second fabric part, which are at least approximately congruent, at least one burst seam being provided which in its intact condition forms a fold as a result of which the volume of the gas bag is reduced as compared to a condition in which the burst seam is destroyed.
Such a gas bag restraint system allows to provide a restraint effect optimally adapted to the conditions in each case. In case of low vehicle speeds and/or light weight of the vehicle occupant to be restrained as well as in case of a small distance of the vehicle occupant from the cover of the gas bag, only a first stage of the inflator is activated so that only a relatively small amount of compressed gas is made available for deploying the gas bag. In this case the burst seam remains intact so that the gas bag is fully deployed despite the low amount of compressed gas made available. By contrast, in case of high vehicle speeds and/or heavy weight of the vehicle occupant to be restrained as well as in case of a large spacing of the vehicle occupant from the cover of the gas bag, several stages of the inflator are activated so that a relatively large amount of compressed gas is made available for deploying the gas bag, resulting in the destruction of the burst seam on deployment of the gas bag, thus enlarging also the volume of the gas bag to accommodate the larger amount of compressed gas.
The invention provides a gas bag restraint system including a multi-stage inflator and a gas bag in flow connection therewith. The gas bag comprises a first and a second fabric part which are at least approximately congruent, and a fabric strip which is stitched to an edge of the first fabric part and to an edge of the second fabric part. At least one burst seam is provided which in an intact condition forms a fold as a result of which the volume of the gas bag is reduced as compared to a condition in which the burst seam is destroyed. The fold formed by the burst seam is arranged in the fabric strip. This configuration permits a particularly simple and advantageous adaptation of the gas bag to specific requirements.
Advantageous configurations of the invention read from the sub-claims.
The invention will now be described with respect to various embodiments as illustrated in the attached drawings in which:
FIGS. 1 to 3 are cross-sections of a gas bag restraint system in accordance with the invention shown in three different conditions;
FIG. 4 is a schematic plan view of the gas bag as shown in FIGS. 1 to 3;
FIGS. 5 and 6 are a schematic plan view and schematic cross-section respectively of a second embodiment of the invention;
FIGS. 7 and 8 are developed views of the fabric strip employed in the gas bag of the gas bag restraint system in accordance with the invention; and
FIGS. 9 to 15 illustrate various arrangements of the burst seam in a gas bag of the gas bag restraint system in accordance with the invention.
Referring now to FIGS. 1 to 4 there is illustrated a first embodiment of a gas bag estraint system in accordance with the invention. It contains a multi-stage inflator 10 in flow connection with a gas bag 12 consisting of a first fabric part 14, a second fabric part 16 and a fabric strip 18. The first and second fabric parts 14, 16 are configured approximately circular and congruent to each other, and the fabric strip 18 is stitched to the fabric parts 14, 16 along their circumferential edges by means of seams 20, 21.
Extending through the fabric parts 14, 16 and the fabric strip is a burst seam 22 securing the two fabric parts 14, 16 to each other in a short distance from their edge and thereby holding the fabric strip 18 in a fold 24 arranged in the direction of the interior of the gas bag 12 (see FIG. 1).
If the circumstances do not require the activation of all stages of the inflator, the pressure resulting in the interior of the gas bag 12 is not sufficiently high to destroy the burst seam 22, i.e. the fold 24 will still be present even when the gas bag is deployed.
If, however, all stages of the inflator 10 are activated, the pressure building up in the interior of the gas bag results in the destruction of the burst seam 22 (see FIG. 2). As a result, the fold 24 is released and the gas bag is able to deploy to a larger volume(see FIG. 3).
In FIGS. 5 and 6 is shown a second embodiment of a gas bag restraint system in accordance with the invention. This embodiment differs from the first embodiment by three burst seams 22, 22′, 22″ being provided arranged along concentric circles. The burst seams are dimensioned so that they are destroyed one after the other, thus allowing intermediate stages between a condition in which the burst seams are still filly intact and a condition in which the burst seams are totally destroyed.
Referring now to FIGS. 7 and 8 two variants of the fabric strip 18 are shown, the arrow K symbolizing in each case the warp direction of the fabric employed. In FIG. 7 the warp direction is thus parallel to the longer sides of the fabric strip, resulting in only a slight transverse expansion when the gas bag is inflated. In FIG. 8, on the other hand, the fabric strip 18 is cut so that the warp direction runs obliquely to the longer sides. This results in a high transverse expansion when the gas bag is inflated, resulting in a reduction of stress peaks.
Referring now to FIGS. 9 to 13 various arrangements of the burst seam 22 are illustrated.
In the embodiment as shown in FIG. 9 the burst seam runs roughly centrally through the fold formed by means of the fabric strip 18, whereas in FIG. 10 the burst seam runs within the fold formed by the fabric strip 18; in this third configuration the difference in the volume of the gas bag between the condition with an intact burst seam and the condition in which the burst seam is destroyed is especially great.
In the embodiment as shown in FIG. 11 the fabric part 18 is stitched to the edge portion of the fabric parts 14, 16, but in a distance of the outer circumference. In addition, the burst seam 22 extends through the fabric strip 18, the fold of which in this embodiment is not oriented towards the interior of the gas bag but to the exterior.
In the embodiment as shown in FIGS. 12 and 13, the fold formed by the fabric strip 18 is located almost completely outside of the gas bag. The burst seam 22 is only in contact with the fabric strip 18 , but not with the fabric parts 14, 16.
The burst seam 22 in the embodiment as shown in FIG. 14 extends over a circular arc. The burst seam is arranged so that its open portion faces the upper part of the body of the vehicle occupant to be restrained. In this way, the gas bag is first deployed in its portion facing the upper part of the body of the restrained vehicle occupant, this being the region in which a restraining action is first needed in time.
Referring now to FIG. 15 there is illustrated an embodiment of a burst seam extending over a spiral path. Depending on the volume of compressed gas made available by the inflator, this burst seam may be destroyed only in part. In this way, differing amounts of compressed gas made available, resulting e.g. from differing operating temperatures such as −35° C. or +85° C., can be accommodated by the gas bag with a volume adapted thereto.
The burst seam extening in a spiral path could be arranged in the form of a spiral with two threads. The ends of the theads arranged in the middle of the gas bag could in this embodiment be joined so as to form a continuous burst seam.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS4007685 *Jul 30, 1975Feb 15, 1977The United States Of America As Represented By The Secretary Of The ArmyGas generatorUS5048863 *May 11, 1989Sep 17, 1991Daimler-Benz AgAnti-collision cushion for the occupants of a motor vehicleUS5454595 *Sep 8, 1994Oct 3, 1995Morton International, Inc.Hidden volume cushionUS5511821 *Dec 21, 1994Apr 30, 1996Morton International, Inc.Vehicle restraint system cushion with sacrificial tear seamUS5599040 *Jun 1, 1995Feb 4, 1997Toyota Jidosha Kabushiki KaishaBag for air bag system and manufacturing method thereofUS5732973Jul 22, 1996Mar 31, 1998Trw Vehicle Safety Systems Inc.Tuck folded air bagUS5871231 *Dec 9, 1996Feb 16, 1999Simula Inc.Low aggressivity variable-volume variable-inflation air bag systemUS5899495 *Apr 25, 1997May 4, 1999Nihon Plast Co., Ltd.Air bag system and method of folding an air bagUS6164696 *Jul 23, 1998Dec 26, 2000Trw Occupant Restraint Systems Gmbh & Co. KgGas bag restraint systemDE19521071A1Jun 9, 1995Dec 14, 1995Takata CorpLuft- bzw. GassackWO1997046425A1Jun 5, 1997Dec 11, 1997Simula, Inc.Low aggressivity variable-volume variable-inflation air bag system* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS7398992 *Nov 15, 2004Jul 15, 2008Tk Holdings Inc.Air bagUS7401811Sep 2, 2004Jul 22, 2008Honda Motor Co., Ltd.Airbag deviceUS7441804 *Apr 27, 2005Oct 28, 2008Autoliv Asp, Inc.Airbag cushion folding methodUS7481456 *Jun 6, 2008Jan 27, 2009Honda Motor Co., Ltd.Airbag apparatusUS7581755Jun 20, 2008Sep 1, 2009Honda Motor Co., Ltd.Airbag deviceUS7669887 *Jun 9, 2004Mar 2, 2010Autoliv Development AbAir bagUS7775553 *Jun 23, 2009Aug 17, 2010Honda Motor Co., Ltd.Vehicle occupant protection apparatusUS7845680Apr 24, 2007Dec 7, 2010Takata CorporationAirbag and airbag apparatusUS7845682 *Jan 6, 2009Dec 7, 2010Autoliv Asp, Inc.Airbag cushion folding methodsUS7926844Apr 10, 2008Apr 19, 2011Autoliv Asp, Inc.Airbag assembly and method of packingUS7942442 *Oct 27, 2008May 17, 2011Autoliv Asp, Inc.Airbag cushion folding methodsUS8226118Aug 5, 2009Jul 24, 2012Autoliv Asp, Inc.Safety venting with passively closeable ventsUS8407968Oct 16, 2009Apr 2, 2013Autoliv Asp, Inc.Method of packaging an inflatable airbag cushion including a wrapper and deployment flapUS8414023 *Mar 14, 2011Apr 9, 2013Toyoda Gosei Co., Ltd.AirbagUS8540276Nov 7, 2011Sep 24, 2013Autoliv Asp, Inc.Inflatable knee airbag assemblies with cushion fold patternUS20050098991 *Sep 2, 2004May 12, 2005Honda Motor Co., Ltd.Airbag deviceUS20050151359 *Nov 15, 2004Jul 14, 2005Marriott Brandon S.Air bagUS20050206147 *Mar 29, 2005Sep 22, 2005Takata-Petri (Ulm) GmbhAirbag deviceUS20060202458 *Mar 14, 2006Sep 14, 2006Trw Automotive GmbhGas bagUS20060244248 *Apr 27, 2005Nov 2, 2006Rose Larry DAirbag cushion folding methodUS20070267851 *Jun 9, 2004Nov 22, 2007Ernma SvenbrantAir BagUS20080036189 *Jul 11, 2007Feb 14, 2008Takata CorporationAirbagUS20080265552 *Jun 20, 2008Oct 30, 2008Honda Motor Co., Ltd.Airbag deviceUS20080303257 *Jun 6, 2008Dec 11, 2008Honda Motor Co., Ltd.Airbag apparatusUS20090102173 *Oct 27, 2008Apr 23, 2009Autoliv Asp, Inc.Airbag cushion folding methodsUS20090108574 *Jan 6, 2009Apr 30, 2009Autoliv Asp, Inc.Airbag cushion folding methodsUS20090236836 *Apr 24, 2007Sep 24, 2009Takata CorporationAirbag and Airbag ApparatusUS20090256336 *Jun 23, 2009Oct 15, 2009Honda Motor Co., Ltd.Vehicle occupant protection apparatusUS20110031725 *Aug 5, 2009Feb 10, 2011Autoliv Asp, Inc.Safety venting with passively closeable ventsUS20110088356 *Oct 16, 2009Apr 21, 2011Autoliv Asp, Inc.Inflatable airbag cushions with deployment flaps and methods for foldingUS20110260436 *Mar 2, 2011Oct 27, 2011Park Hae KwonPassenger airbag apparatusCN1962322BNov 11, 2005Dec 28, 2011高田-彼得里（乌尔姆）有限公司气囊装置CN100586764CFeb 28, 2005Feb 3, 2010丰田合成株式会社Knee protective airbagCN102205828A *Mar 30, 2011Oct 5, 2011丰田合成株式会社AirbagCN102233860A *Mar 17, 2011Nov 9, 2011现代摩比斯株式会社Passenger airbag apparatusEP1514743A1 *Sep 6, 2004Mar 16, 2005HONDA MOTOR CO., Ltd.Airbag device* Cited by examinerClassifications U.S. Classification280/743.1International ClassificationB60R21/26, B60R21/2342, B60R21/263, B60R21/16Cooperative ClassificationB60R21/2342, B60R2021/2633European ClassificationB60R21/2342Legal EventsDateCodeEventDescriptionJul 22, 1999ASAssignmentOwner name: TRW OCCUPANT RESTRAINT SYSTEMS GMBH & CO. KG, GERMFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ELLERBROK, NORBERT;JURGENS, GERD;KNODLER, GIANULA;AND OTHERS;REEL/FRAME:010130/0531Effective date: 19990701Jun 30, 2005FPAYFee paymentYear of fee payment: 4Oct 12, 2009REMIMaintenance fee reminder mailedMar 5, 2010LAPSLapse for failure to pay maintenance feesApr 27, 2010FPExpired due to failure to pay maintenance feeEffective date: 20100305RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services