FR2724626A1 - Method of stitching of vehicle inflatable air bag - Google Patents
Method of stitching of vehicle inflatable air bag Download PDFInfo
- Publication number
- FR2724626A1 FR2724626A1 FR9411166A FR9411166A FR2724626A1 FR 2724626 A1 FR2724626 A1 FR 2724626A1 FR 9411166 A FR9411166 A FR 9411166A FR 9411166 A FR9411166 A FR 9411166A FR 2724626 A1 FR2724626 A1 FR 2724626A1
- Authority
- FR
- France
- Prior art keywords
- stitching
- seam
- bag
- seams
- sewing
- Prior art date
- Legal status (The legal status 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 status listed.)
- Withdrawn
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
- B60R21/23—Inflatable members
- B60R21/235—Inflatable members characterised by their material
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B93/00—Stitches; Stitch seams
-
- 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
- B60R21/23—Inflatable members
- B60R21/235—Inflatable members characterised by their material
- B60R2021/23571—Inflatable members characterised by their material characterised by connections between panels
- B60R2021/23576—Sewing
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Air Bags (AREA)
Abstract
Description
La présente invention concerne un sac de retenue gonflable pour véhicule automobile, destiné à être associé à un générateur de gaz et logé dans le véhicule de façon, en cas de choc, à être automatiquement et instantanément gonflé par du gaz sous pression pour constituer un coussin protégeant le visage et la poitrine, ou une autre partie du corps, des utilisateurs transportés. The present invention relates to an inflatable retaining bag for a motor vehicle, intended to be associated with a gas generator and housed in the vehicle so as, in the event of an impact, to be automatically and instantly inflated by pressurized gas to constitute a cushion protecting the face and chest, or other part of the body, of transported users.
L'objet de l'invention porte plus particulièrement sur l'assemblage par couture des faces avant et arrière pour de tels sacs de retenue gonflables confectionnés à plat, et/ou sur l'assemblage des éléments formant des panneaux pour de tels sacs de retenue gonflables tridimensionnels. Pour faciliter l'exposé on désignera ici de telles faces et de tels panneaux par le terme "éléments". The object of the invention relates more particularly to the assembly by sewing of the front and rear faces for such inflatable retaining bags made flat, and / or to the assembly of elements forming panels for such retaining bags three-dimensional inflatables. To facilitate the presentation, such faces and panels will be designated here by the term "elements".
Habituellement de tels éléments, sur les sacs de retenue gonflables, sont assemblés par des coutures. On remarque que les éléments assemblés formant des surfaces géométriques définies, leur périphérie est toujours assemblée par des coutures formant des trajectoires fermées, et/ou par des portions de couture se rejoignant. On comprend aisément que pour garantir l'étanchéité du sac de retenue gonflable, ainsi que la continuité des coutures par rapport aux contraintes, il est nécessaire de lier les deux extrémités des coutures lorsqu'elles se referment sur elles-mêmes, ou les jonctions des différentes coutures, lorsque des portions de coutures se rejoignent. Usually such elements, on the air bags, are joined by seams. It is noted that the assembled elements forming defined geometric surfaces, their periphery is always assembled by seams forming closed trajectories, and / or by joining portions of seam. It is easily understood that to guarantee the sealing of the inflatable retaining bag, as well as the continuity of the seams with respect to the stresses, it is necessary to link the two ends of the seams when they close on themselves, or the junctions of the different seams, when portions of seams meet.
De même, il est nécessaire d'immobiliser les fils sur les premiers et les derniers points de chaque portion de couture, de manière à empêcher le dénouage des coutures par leurs extrémités, ce qu'on désigne généralement par le terme "arrêts de couture". Similarly, it is necessary to immobilize the threads on the first and last stitches of each sewing portion, so as to prevent the untapping of the seams by their ends, which is generally designated by the term "sewing stops" .
De telles liaisons sont habituellement réalisées par des recouvrements de couture. Ces recouvrements de couture présentent toutefois l'inconvénient de générer des zones locales où la densité de points par longueur de couture est supérieure à celle donnée par le pas de couture choisi, en pouvant aller jusqu'au double, ce qui fragilise les éléments assemblés et crée des zones préférentielles de départ de déchirures. Such connections are usually made by seam overlaps. These seam overlaps, however, have the drawback of generating local areas where the density of stitches per length of seam is greater than that given by the sewing pitch chosen, being able to go up to double, which weakens the assembled elements and creates preferential tear start zones.
Un autre inconvénient réside dans le fait que les arrêts de couture se trouvent dans des zones soumises à des contraintes lors du gonflage du sac de retenue gonflable, ce qui est une cause de destruction des coutures. Another drawback lies in the fact that the sewing stops are in areas subjected to stresses when the inflatable retaining bag is inflated, which is a cause of destruction of the seams.
La présente invention à pour objet de remédier aux inconvénients mentionnés ci-dessus des sacs de retenue gonflables connus dans lesquels les coutures d'assemblage sont fermées sur elles mêmes, ou liées entre elles, par des recouvrements. The object of the present invention is to remedy the drawbacks mentioned above of known inflatable retaining bags in which the assembly seams are closed on themselves, or linked together, by covers.
Selon l'invention, le procédé de fermeture ou de jonctionnement d'une couture d'assemblage de faces ou de panneaux pour sac de retenue gonflable se caractérise en ce qu' à l'endroit de fermeture ou de jonctionnement, la couture prend une trajectoire qui croise sa trajectoire antérieure ou la trajectoire de la couture qu'elle rejoint. According to the invention, the method of closing or joining a seam for assembling faces or panels for an inflatable retaining bag is characterized in that at the point of closure or joining, the seam takes a trajectory which crosses its previous path or the path of the seam it joins.
De cette manière, il n'y a pas de recouvrement de couture, ce qui évite des zones où la densité de points par longueur de couture serait plus élevée qu'ailleurs et fragiliserait alors les éléments assemblés. In this way, there is no seam overlap, which avoids areas where the density of stitches per length of seam would be higher than elsewhere and would then weaken the assembled elements.
D'autre part, sur de tels assemblages, les longueurs de couture destinées à réaliser des arrêts de couture sont situées en dehors de la zone du sac se trouvant sous contrainte lors du gonflage de celui-ci, ce qui évite une cause de destruction des coutures. I1 est possible, de cette manière, de réaliser si besoin des arrêts de couture en faisant des marches arrière ou des aller-retours sur les départs et les fins de couture, sans pour cela placer des concentrations de points de couture excessives dans des parties de paroi soumises à des contraintes. On the other hand, on such assemblies, the seam lengths intended to make sewing stops are located outside the zone of the bag which is under stress during inflation thereof, which avoids a cause of destruction of the stitching. It is possible, in this way, to make sewing stops if necessary by backing up or going back and forth on the start and end of sewing, without for this placing excessive concentrations of stitching in parts of wall subjected to stresses.
Pour bien faire comprendre l'invention, on en décrira ci-après, à titre d'exemble non limitatif, une forme d'exécution préférée de l'invention en référence au dessin schématique annexé dans lequel
la figure 1 est une vue en plan d'un sac de retenue gonflable, pourvu de coutures selon l'invention, représenté à plat
la figure 2 est une coupe verticale, prise selon la ligne II-II de la figure 1, du sac de retenue représenté à l'état gonflé, montrant particulièrement les faces assemblées ; et
la figure 3 est une vue de détail de la figure 1, montrant plus particulièrement les trajectoires des coutures au niveau de leur croisement et de leur arrêt.To clearly understand the invention, a preferred embodiment of the invention will be described below, by way of non-limiting example, with reference to the appended schematic drawing in which
Figure 1 is a plan view of an inflatable retaining bag, provided with seams according to the invention, shown flat
Figure 2 is a vertical section, taken along line II-II of Figure 1, of the retaining bag shown in the inflated state, particularly showing the assembled faces; and
Figure 3 is a detail view of Figure 1, showing more particularly the trajectories of the seams at their crossing and their stop.
En référence aux figures 1, 2 et 3, on a représenté en 1 un sac de sécurité, montré en position dégonflé à plat aux figures 1 et 3, et gonflé à la figure 2. With reference to FIGS. 1, 2 and 3, a safety bag has been shown at 1, shown in the deflated position flat in FIGS. 1 and 3, and inflated in FIG. 2.
Le sac 1 est réalisé en tissu enduit souple étanche, et il présente une face avant 2, disposée vers le conducteur du véhicule (non représenté), et une face arrière 3, attachée au boîtier (non représenté) contenant le sac et le générateur de gaz. The bag 1 is made of waterproof flexible coated fabric, and it has a front face 2, arranged towards the driver of the vehicle (not shown), and a rear face 3, attached to the housing (not shown) containing the bag and the generator. gas.
Comme on le voit sur la figure 2, les faces 2 et 3 sont assemblées par des coutures 4 et 5. Ainsi qu'il apparait sur la figure 1, les coutures 4 et 5 sont jonctionnées sur elles-mêmes par un croisement 6, 6'. As seen in Figure 2, the faces 2 and 3 are joined by seams 4 and 5. As it appears in Figure 1, the seams 4 and 5 are joined on themselves by a crossing 6, 6 '.
Comme on le voit plus en détail sur la figure 3, la disposition géométrique des coutures au niveau du croisement 6, 6' fait qu'il n'y à pas de recouvrement de chacune des coutures 4 et 5, ce qui évite une fragilisation de cette zone. D'autre part, les extrémités 7 et 9 de la couture 4 sont placées du côté extérieur de la surface fermée créée par cette couture ce qui a l'avantage de les placer dans une zone non contrainte lors du gonflage du sac. Il en est de même des extrémités 8 et 10 de la couture 5. As can be seen in more detail in FIG. 3, the geometrical arrangement of the seams at the crossing 6, 6 ′ means that there is no overlap of each of the seams 4 and 5, which prevents embrittlement of this zone. On the other hand, the ends 7 and 9 of the seam 4 are placed on the outside of the closed surface created by this seam, which has the advantage of placing them in an unstressed area during inflation of the bag. It is the same for the ends 8 and 10 of the seam 5.
Avantageusement, les extrémités 7, 8, 9, 10 des coutures 4 et 5 peuvent être terminées par des arrêts de couture (non représentés) qui ne sont pas fragilisants, étant placés à l'extérieur de la surface fermée créée par les coutures 4 et 5, et donc dans une zone non contrainte lors du gonflage du sac. Advantageously, the ends 7, 8, 9, 10 of the seams 4 and 5 can be terminated by sewing stops (not shown) which are not embrittling, being placed outside the closed surface created by the seams 4 and 5, and therefore in an unconstrained area during inflation of the bag.
On comprendra que la description ci-dessus a été donnée à simple titre d'exemple, sans caractère limitatif, et que des adjonctions ou des modifications constructives pourraient y être apportées sans sortir du cadre de l'invention. On comprendra en particulier que le procédé selon l'invention s'applique à des coutures en point noué, en point de chaînette ou en tout autre point approprié. It will be understood that the above description has been given by way of example, without limitation, and that additions or constructive modifications could be made without departing from the scope of the invention. It will be understood in particular that the method according to the invention applies to lockstitch seams, chainstitch seams or any other suitable stitch.
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9411166A FR2724626A1 (en) | 1994-09-20 | 1994-09-20 | Method of stitching of vehicle inflatable air bag |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9411166A FR2724626A1 (en) | 1994-09-20 | 1994-09-20 | Method of stitching of vehicle inflatable air bag |
Publications (1)
Publication Number | Publication Date |
---|---|
FR2724626A1 true FR2724626A1 (en) | 1996-03-22 |
Family
ID=9467072
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR9411166A Withdrawn FR2724626A1 (en) | 1994-09-20 | 1994-09-20 | Method of stitching of vehicle inflatable air bag |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2724626A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1860001A1 (en) * | 2006-05-26 | 2007-11-28 | Autoliv Development AB | Air bag with a sewed or folded surrounding stitched end of seam |
WO2020152158A1 (en) * | 2019-01-22 | 2020-07-30 | Dalphi Metal Espana, S.A. | Airbag for a vehicle-occupant restraint system |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04113953A (en) * | 1990-09-04 | 1992-04-15 | Asahi Chem Ind Co Ltd | Air bag |
US5141787A (en) * | 1990-05-28 | 1992-08-25 | Nippon Seiki K.K. | Air bag |
GB2257952A (en) * | 1991-07-26 | 1993-01-27 | Airbags Int Ltd | Vehicle airbag |
US5294148A (en) * | 1991-07-29 | 1994-03-15 | Ikeda Bussan Co., Ltd. | Reinforcement structure for vehicle airbag and method of producing the same |
EP0614786A1 (en) * | 1993-03-11 | 1994-09-14 | Morton International, Inc. | Controlled deployment driver's side air bag |
-
1994
- 1994-09-20 FR FR9411166A patent/FR2724626A1/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5141787A (en) * | 1990-05-28 | 1992-08-25 | Nippon Seiki K.K. | Air bag |
JPH04113953A (en) * | 1990-09-04 | 1992-04-15 | Asahi Chem Ind Co Ltd | Air bag |
GB2257952A (en) * | 1991-07-26 | 1993-01-27 | Airbags Int Ltd | Vehicle airbag |
US5294148A (en) * | 1991-07-29 | 1994-03-15 | Ikeda Bussan Co., Ltd. | Reinforcement structure for vehicle airbag and method of producing the same |
EP0614786A1 (en) * | 1993-03-11 | 1994-09-14 | Morton International, Inc. | Controlled deployment driver's side air bag |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 16, no. 363 (M - 1290) 5 August 1992 (1992-08-05) * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1860001A1 (en) * | 2006-05-26 | 2007-11-28 | Autoliv Development AB | Air bag with a sewed or folded surrounding stitched end of seam |
WO2020152158A1 (en) * | 2019-01-22 | 2020-07-30 | Dalphi Metal Espana, S.A. | Airbag for a vehicle-occupant restraint system |
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ST | Notification of lapse |