EP1019268A1 - Siege a airbag - Google Patents

Siege a airbag

Info

Publication number
EP1019268A1
EP1019268A1 EP99933197A EP99933197A EP1019268A1 EP 1019268 A1 EP1019268 A1 EP 1019268A1 EP 99933197 A EP99933197 A EP 99933197A EP 99933197 A EP99933197 A EP 99933197A EP 1019268 A1 EP1019268 A1 EP 1019268A1
Authority
EP
European Patent Office
Prior art keywords
air bag
module
seat
module container
air
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Withdrawn
Application number
EP99933197A
Other languages
German (de)
English (en)
Inventor
Susumu Mizobuchi
Toshiyasu Watanabe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NHK Spring Co Ltd
Original Assignee
NHK Spring Co Ltd
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 NHK Spring Co Ltd filed Critical NHK Spring Co Ltd
Publication of EP1019268A1 publication Critical patent/EP1019268A1/fr
Withdrawn legal-status Critical Current

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
    • B60R21/207—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components in vehicle seats
    • 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
    • B60R2021/0002—Type of accident
    • B60R2021/0006—Lateral collision

Definitions

  • This invention relates to an air-bagged seat provided with a side air bag capable of effectively protecting a user when a vehicle is subjected to a lateral force of impact.
  • An air bag system that is mounted in a vehicle such as an automobile is designed so that an air bag is caused instantaneously to bulge by an inflator in case of a collision of the vehicle, whereby a user can be restrained from undergoing a second collision with some interior members.
  • the air bag system may be located in front of the user, that is, in a center pad of a steering wheel, or near a glove box in front of a passenger seat.
  • a side impact can be effectively tackled by a so-called side air bag that is incorporated in a seat back or the like.
  • an air bag module 4 is incorporated in a side portion 3 that, out of two opposite side portions of a seat back 2, is nearer to a door.
  • An inflator 5 of the air bag module 4 is actuated to generate gas in response to a signal that is delivered by a sensor when the vehicle is subjected to a side impact.
  • An air bag 6 can be inflated with this gas.
  • the seat back 2 includes a frame 7, pad 8, cover member 9, etc.
  • the cover member 9 is composed of a seat-back front cover element 9a, a side cover element 9b, etc.
  • sewing thread 11 in a sewing portion 10 between the seat-back front cover element 9a and the side cover element 9b is broken by pressure that acts thereon from inside the cover member 9.
  • the air bag 6 bulges ahead of the seat back 2 (in the direction indicated by arrow F) through the broken portion, as indicated by two-dot chain line A.
  • the air bag 6 unfolds into a shape such that it can protect the flank, temple, etc. of the user.
  • a lid 4a is provided on the front part of the air bag module 4.
  • the air bag 6 breaks the lid 4a as it unfolds, the unfolding direction of the air bag 6 is subject to variation in some cases. It is to be desired that the air bag 6 should unfolds toward the sewing portion 10. Possibly, however, the air bag 6 may fail to unfold toward the sewing portion 10 from various causes associated with variations in the structures of the lid 4a, inflator 5, etc. When the air bag 6 unfolds, moreover, the seat-back front cover element 9a and the side cover element 9b sometimes may behave so as to inflate as a whole. In this case, the unfolding force of the air bag 6 cannot easily act on the sewing portion 10, so that the seat-back front cover element 9a and the side cover element 9b themselves may possibly be broken.
  • the object of the present invention is to provide an air-bagged seat designed so that an air bag can spread out from an expected portion to be broken as the air bag unfolds, thus ensuring proper unfolding performance.
  • an air-bagged seat comprising an air bag module in a seat back, in which a cover member for covering an air bag storage portion of the seat back is formed by sewing up at least a first cover element (e.g., seat-back front cover element) and a second cover element (e.g., side cover element).
  • the air bag module is stored in a belt- or bag-shaped module container having a pair of opposite side portions, right and left, and a rear end portion. Front end portions of the opposite side portions of the module container are sewn together with the first and second cover elements in a sewing portion between the cover elements.
  • the module container is formed of a material that is as flexible as cloth and is more resistant to tension (or has higher tensile strength) than the first and second cover elements.
  • an inflator When the air-bagged seat according to the present invention is subject to a force of impact, an inflator is actuated, whereupon gas is jetted out to inflate the air bag, and pressure acts from inside the cover member.
  • the unfolding force of the air bag acts on the module container in the initial stage of the unfolding action of the air bag. Since the material of the module container is stouter than the cover member (first and second cover elements), so that the module container itself cannot be broken.
  • the air bag is guided by the opposite side portions of the module container as it unfolds toward the front end portion of the module container or the sewing portion of the cover member, whereby sewing thread or the like in the sewing portion is broken. Accordingly, the air bag unfolds steadily in a regular direction, so that the shock of a second collision between a user and interior members can be eased.
  • the air bag stated herein is a member that can be inflated like a bag with gas, such as nitrogen gas. It is to be understood that the gas to be used for inflation is not limited to nitrogen or air.
  • the unfolding direction of the air bag can be regulated by means of the module container when the air bag unfolds, so that the air bag can be unfolded toward a predetermined expected portion to be broken.
  • the air bag can enjoy a stable unfolding direction and display proper unfolding performance.
  • This module container is a belt- or bag-shaped structure of a flexible pliable material that is sewn together with conventional cover elements in the same spot as the sewing portion of a conventional cover member. Although the module container is sewn to the sewing portion, therefore, the sewing portion cannot be externally conspicuous and never exerts a bad influence upon the external appearance of the seat back.
  • the module container has holes through which bolts for fixing the air bag module to a seat back frame are passed individually. It is advisable to fix the air bag module and the module container to the seat back frame with the bolts in the holes.
  • the module mounting bolts are passed individually through the holes in the module container, so that the holes and the bolts can be utilized as positioning means for the module container. Accordingly, there is no possibility of either of the opposite side portions of the module container undergoing deviation, such as strain or skew, after sewing operation. Since the module container is laterally balanced as it is located on either side of the air bag module, the unfolding direction of the air bag can be made steadier.
  • the module container according to this invention should have a shape such that a bottom portion and the rear end portion between the opposite side portions are closed, and that the top portion and the front end portions of the opposite side portions can be opened when the air bag unfolds.
  • the front end portions and the top portion of the module container are opened when the air bag unfolds, so that the air bag can be unfolded forward and upward with respect to the seat back.
  • Each of the front end portions of the module container may be provided with a seam length adjusting portion for adjusting the seam length of the module container sewn to the cover member. According to this invention, the seam length of the sewing portion at the front end portions of the module container is reduced, so that the sewing portion of the module container can be made easily breakable when the air bag unfolds. Accordingly, the unfolding action of the air bag in a predetermined position can be made steadier.
  • FIG. 1 is a partial cross-sectional view of an air-bagged seat according to a first embodiment of this invention
  • FIG. 2 is a perspective view of the air-bagged seat shown in FIG. 1;
  • FIG. 3 is an exploded perspective view of part of the air-bagged seat shown in FIG. 1;
  • FIG. 4 is a perspective view showing an unfolded state of an air bag of the air-bagged seat shown in FIG. 1;
  • FIG. 5A is a sectional view of a sewing portion of a air-bagged seat according to a second embodiment of this invention.
  • FIG. 5B is a sectional view of a sewing portion of a air-bagged seat according to a third embodiment of this invention
  • FIG. 6 is a perspective view of a module container according to a fourth embodiment of this invention
  • FIG. 7A is a side view of a module container according to a fifth embodiment of this invention
  • FIG. 7B is a side view of a module container according to a sixth embodiment of this invention
  • FIG. 7C is a side view of a module container according to a seventh embodiment of this invention.
  • FIG. 8 is a cross-sectional view of part of a conventional air-bagged seat.
  • the seat back 22 is provided with a seat back frame 23, a pad 24 formed of, e.g., polyurethane foam, and a cover member (front seat trim cover) 25 that externally covers the seat back frame 23, pad 24, etc.
  • a bracket 28 is fixed to the lateral of the seat back frame 23 by welding or the like.
  • the bracket 28 includes a mounting plate 28a having a shape such that it extends along an air bag module 30 described below.
  • the air bag module 30 which constitutes a side air bag system, is incorporated in one of two opposite side portions 22a and 22b of the seat back 22, that is, the side portion 22a that is nearer to a door.
  • the air bag module 30 is provided with a casing 31 fixed to the mounting plate 28a of the bracket 28 of the seat back frame 23, an air bag 32 folded and stored in the casing 31, an inflator 33 for generating inflator gas such as nitrogen gas, etc.
  • bolts 35 protrude from the casing 31 of the air bag module 30.
  • the bolts 35 are passed individually through holes 36 that are formed in the mounting plate 28a.
  • the air bag module 30 is fixed in a predetermined position on the bracket 28 by fastening nuts 37 individually to the bolts 35 in an engaged manner.
  • the casing 31 functions also as a guide member for regulating the direction in which the inflator gas is jetted out.
  • a lid 31a is provided on the front part of the casing 31.
  • the inflator 33 is connected with an ignition system, which includes a sensor for detecting a side impact of a vehicle, a power source (not shown), etc.
  • the cover member 25, which constitutes a seat back covering is formed by cutting a flexible cover element of artificial leather or woven fabric into a given shape and sewing it.
  • An example of artificial leather is obtained by coating the outer surface of knitted fabric for use as a back fabric base with an elastic material such as an elastomer layer.
  • the cover member 25, which covers the side portion 22a that functions as an air bag storage portion includes a seat-back front cover element 25a for use as a first cover element according to this invention and a side cover element 25b as a second cover element.
  • the seat-back front cover element 25a constitutes the front face of the side portion 22a.
  • the side cover element 25b constitutes the side face of the side portion 22a.
  • cover elements 25a and 25b are sewn together at a sewing portion 40 by means of sewing thread 41.
  • the air bag module 30 is fixed to the mounting plate 28a of the bracket 28 in a manner such that it is stored inside a belt-shaped module container 50 illustrated in FIG. 3.
  • the module container 50 according to this embodiment is formed of a flexible sheetlike material that has higher tensile strength and impact resistance than the seat-back front cover element 25a and the side cover element 25b.
  • a pair of opposite side portions 50a and 50b, which extend along two opposite side faces 30a and 30b, respectively, of the air bag module 30, and a rear end portion 50c, which extends along a rear end face 30c of the air bag module 30, are formed by turning up the sheetlike material in the shape of a U.
  • the module container 50 which need not be of any special material, may be formed of woven or nonwoven fabric based on flexible synthetic fibers with high tensile strength. Alternatively, it may be formed of a synthetic resin sheet with high tensile strength. In order to enhance its longitudinal tensile strength, moreover, the module container 50 may be reinforced with fine metal wires, aramid fibers, or other reinforcing materials that have tensile strength high enough but not too high for the maintenance of flexibility. As shown in FIG.
  • the module container 50 is formed having holes 55 through which the bolts 35 are passed individually.
  • the front end portions 51 of the module container 50 are previously sewn together with the seat-back front cover element 25a and the side cover element 25b at the sewing portion 40 between the cover elements 25a and 25b.
  • the air bag module 30 is interposed between the opposite side portions 50a and 50b of the module container 50, and the bolts 35 are passed individually through the holes 55 of the module container 50.
  • the air bag module 30 is attached to the bracket 28 in a manner such that the bolts 35 are passed individually through the holes 36 of the bracket 28 and the nuts 37 are fastened from behind the bracket 28.
  • the air bag module 30 and the module container 50 are fixed in one united body to the seat back frame 23. Since the module container 50 according to this embodiment has its top and bottom open, the air bag module 30 can be put inside the module container 50 even after the front end portions 51 are sewn to the cover member 25.
  • the inflator 33 When the vehicle is subjected to a lateral force of impact, the inflator 33 is actuated in response to a signal delivered from the sensor for detecting a collision of the vehicle, whereupon the inflator gas such as nitrogen gas is jetted out from the inflator 33.
  • the jetted gas is ejected into the air bag 32 in a manner such that the direction of its ejection is regulated by the casing 31.
  • the air bag 32 starts to be inflated with the ejected gas from the inflator 33, the lid 31a is broken, and the air bag 32 unfolds ahead of the casing 31.
  • the air bag 32 unfolds toward the front end portions 51 of the module container 50, that is, toward the sewing portion 40 between the seat-back front cover element 25a and the side cover element 25b, in a manner such that its unfolding direction is regulated by the opposite side portions 50a and 50b of the module container 50. Pressure from this unfolding action acts on the sewing portion 40 from behind the cover member 25.
  • the behavior of the air bag 32 moving toward the side cover element 25b can be restrained by means of the side portion 50b of the module container 50.
  • the side cover element 25b can be effectively prevented from breaking, and the unfolding force of the air bag 32 acts directly on the sewing thread 41 in the sewing portion 40.
  • FIG. 4 shows an unfolded state of the air bag 32.
  • the air bag 32 thus unfolded is located in a space between the flank of a seated user's body and an inner side wall of the vehicle body, whereby the shock of a second collision between the user and the inner side wall of the vehicle body can be eased.
  • the module mounting bolts 35 are passed individually through the holes 55 in the module container 50, so that the holes 55 and the bolts 35 can be utilized as positioning means for the module container 50.
  • the opposite side portions 50a and 50b of the module container 50 can be arranged on the opposite sides of the air bag module 30 uniformly and satisfactorily without the possibility of either of the opposite side portions 50a and 50b undergoing deviation, such as strain or skew. Accordingly, the air bag 32 can be guided in a steadier unfolding direction by the opposite side portions 50a and 50b of the module container 50 as the air bag 32 unfolds.
  • FIG. 5A shows a second embodiment of the present invention.
  • front end portions 51 of two opposite side portions 50a and 50b of a module container 50 are situated on either side of a sewing portion 40 between a seat-back front cover element 25a and a side cover element 25b.
  • the cover elements 25a and 25b are sewn up in one united body with the sewing portion 40 between them held by means of the front end portions 51 from both sides.
  • FIG. 5B shows a third embodiment of the present invention.
  • a seat-back front cover element 25a, a side cover element 25b, and two opposite side portions 50a and 50b of a module container 50 are sewn together in a manner such that they are put on one another, as indicated by two-dot chain line in the drawing. Thereafter, the cover elements 25a and 25b and the opposite side portions 50a and 50b of the module container 50 are turned up, as indicated by arrows C and D. These steps of procedure further facilitate the sewing operation.
  • the cover member 25 that covers the side portion 22a for use as the air bag storage portion may be formed by combining the seat-back front cover element 25a, side cover element 25b, and other cover elements.
  • the module container 50 may be in the form of a bag. In this case, an open edge portion of the bag is sewn together with the sewing portion 40.
  • the bag-shaped module container may be formed by blow molding or by sewing cloth into the form of a bag, for example.
  • a module container 50 according to a fourth embodiment shown in FIG. 6 is in the form of a bag, in which a rear end portion (back surface) 50c between a pair of side portions 50a and 50b, right and left, is closed, a bottom portion 50e is closed, and the top side is open.
  • front end portions 51 and the top side of the module container 50 may be designed to be opened when the air bag unfolds.
  • the air bag can be unfolded forward and upward with respect to the seat back. Since the top side of the module container 50 is also open in this case, an air bag module 30 can be introduced into the module container 50 without any problem even after the front end portions 51 are sewn to a sewing portion 40.
  • each of front end portions 51 of the module container 50 is provided with a seam length adjusting portion 60 for adjusting the seam length of the module container 50 in a sewing portion 40.
  • An example of the seam length adjusting portion 60 is tapered so that a vertical width Wl of the front end portions 51 is shorter than a vertical width W2 of two opposite side portions 50a and 50b. With use of this tapered shape, the seam length of the module container 50 in the sewing portion 40 can be reduced. According to the above-described embodiment having the seam length adjusting portions 60, the seam length of the sewing portion 40 of the module container 50 is reduced, so that the sewing portion 40 of the module container 50 can be made easily breakable when the air bag unfolds.
  • Each seam length adjusting portion 60 may be obtained by cutting each front end portion 51 of a module container 50 in the form of a chevron as in a sixth embodiment shown in FIG. 7B, for example. Alternatively, part of each front end portion 51 may be notched in the width direction, as in a seventh embodiment shown in FIG. 7C.
  • the first and second cover elements to which the front end portions 51 of the module container 50 are sewn may be any other cover elements than the seat-back front cover element 25a and the side cover element 25b.
  • the air bag module 30 is supposed to be incorporated in the seat back 22 of a passenger seat in a right-hand wheel vehicle.
  • this invention may be also applied, with the same effect as aforesaid, to a seat in which an air bag module 30 and a module container 50 similar to the ones according to the foregoing embodiments are incorporated in a side portion that is nearer to the door of the seat back of a driver's seat, for example.
  • the unfolding direction of the air bag can be regulated by means of the module container, so that the air bag can be unfolded toward a predetermined expected portion to be broken.
  • This air bag can enjoy a stable unfolding direction and display proper unfolding performance.
  • the air-bagged seat of this invention is suited for use in a vehicle such as an automobile. Additional advantages and modifications will readily occur to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details and representative embodiments shown and described herein. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents,

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Air Bags (AREA)
  • Seats For Vehicles (AREA)

Abstract

L'invention concerne un élément de couverture (25) utilisé pour couvrir une partie de rangement d'airbag (22a) d'un dossier de siège (22), qui est formé par couture d'un élément de couverture avant (25a), d'un élément de couverture latérale (25b) de dossier de siège, etc. Un module airbag (30) est rangé dans un logement de module (50) qui est placé dans la partie de rangement d'airbag (22a). Le logement de module (50), qui est constitué d'un matériau sous forme de feuille souple, comprend deux parties latérales (50a, 50b) opposées qui s'étendent individuellement le long de deux faces opposées du module airbag (30), ainsi qu'une partie terminale arrière (50c) qui s'étend le long de la face terminale arrière du module airbag (30). Des parties terminales avant (51) du logement de module (50) sont cousues avec l'élément de couverture avant (25a) de dossier de siège et avec l'élément de couverture latéral (25b), dans une partie de couture (40) se trouvant entre les éléments de couverture (25a, 25b). La partie de couture (40) et les parties terminales avant (51) du logement de module (50) s'ouvrent lorsque l'airbag (30) se gonfle.
EP99933197A 1998-07-31 1999-07-30 Siege a airbag Withdrawn EP1019268A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP21746598A JP4132259B2 (ja) 1998-07-31 1998-07-31 エアバッグ内蔵シート
JP21746598 1998-07-31
PCT/JP1999/004121 WO2000006426A1 (fr) 1998-07-31 1999-07-30 Siege a airbag

Publications (1)

Publication Number Publication Date
EP1019268A1 true EP1019268A1 (fr) 2000-07-19

Family

ID=16704666

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99933197A Withdrawn EP1019268A1 (fr) 1998-07-31 1999-07-30 Siege a airbag

Country Status (3)

Country Link
EP (1) EP1019268A1 (fr)
JP (1) JP4132259B2 (fr)
WO (1) WO2000006426A1 (fr)

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Also Published As

Publication number Publication date
JP4132259B2 (ja) 2008-08-13
JP2000043669A (ja) 2000-02-15
WO2000006426A1 (fr) 2000-02-10

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