WO2004071819A1 - An air-bag unit - Google Patents

An air-bag unit Download PDF

Info

Publication number
WO2004071819A1
WO2004071819A1 PCT/SE2004/000165 SE2004000165W WO2004071819A1 WO 2004071819 A1 WO2004071819 A1 WO 2004071819A1 SE 2004000165 W SE2004000165 W SE 2004000165W WO 2004071819 A1 WO2004071819 A1 WO 2004071819A1
Authority
WO
WIPO (PCT)
Prior art keywords
spring
air
cover
leaf
bag unit
Prior art date
Application number
PCT/SE2004/000165
Other languages
French (fr)
Inventor
Ricardo Soriano
Manuel Vales
Enrique Gomez
Original Assignee
Autoliv Development Ab
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 Autoliv Development Ab filed Critical Autoliv Development Ab
Publication of WO2004071819A1 publication Critical patent/WO2004071819A1/en

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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
    • B60R21/21656—Steering wheel covers or similar cup-shaped covers
    • B60R21/21658—Steering wheel covers or similar cup-shaped covers with integrated switches, e.g. horn switches

Definitions

  • THE PRESENT INVENTION relates to an air-bag unit, and more particularly relates to an air-bag adapted to be mounted within the steering- wheel of a motor vehicle.
  • the air-bag unit has been mounted, to the steering-wheel, so that the entire unit, or at least part of the unit, may "float” relative to the steering-wheel.
  • an air-bag unit is biased upwardly by means of helical springs, and may move or “float” downwardly, in response to manual pressure applied to the upper cover of the air-bag unit, with the springs being compressed.
  • electrical contacts may be provided which are closed when the air-bag unit is moved downwardly, thus completing a horn circuit and sounding the horn on the motor vehicle.
  • the illustrated arrangement is relatively complex, and, because of the number of parts, is relatively expensive to fabricate. It has been proposed previously to retain a "floating" air-bag unit of the type generally described above in position on the hub of the steering-wheel by utilising a long snap-in-spring.
  • the snap-in-spring may have the form shown in EP-A- 1,179,457.
  • the snap-in-spring passes across a plurality of apertures which may be formed either in a hub plate, or in a plate provided on the air-bag unit. The apertures in the plate are located to receive a corresponding plurality of feet.
  • Each foot is in the form of a post, preferably with a chamfered end, and carrying a slot in at least one side-wall.
  • the chamfered ends of the feet displace the snap-in-spring, and when the slot in the side-wall of each foot is at alignment with the spring, the spring moves resiliently back towards its initial position, with part of the spring then being received in the slot in the side-wall of the foot.
  • Each foot is thus trapped, and the air-bag unit is consequently mounted to the steering-wheel hub.
  • the present invention seeks to provide an improved air-bag unit.
  • an air-bag unit comprising a cover, the cover being mounted for movement, there being at least one spring engaging part of the cover, the spring being configured to be deformed when the cover is moved, there being an electrical contact located adjacent the spring to be touched by part of the spring when the spring is deformed as a consequence of movement of the cover to complete a circuit, wherein the electrical contact forms part of a retaining spring carried by the gas generator, the retaining spring fomiing part of a "snap" fastening for retaining the air-bag unit in position.
  • the spring is a leaf-spring.
  • the leaf-spring is connected to a gas generator unit contained within the air-bag unit, part of the leaf-spring biasing a side-wall foraiing part of the cover, the cover being mounted to the gas generator unit for movement relative to the gas generator unit.
  • each leaf-spring comprising a central portion and two terminal portions, each terminal portion being configured to engage part of a side-wall of the cover.
  • the electrical contact may be a metal strip or some other metal component provided for that purpose.
  • FIGURE 1 is a diagrammatic view illustrating schematically components of an air-bag unit in accordance with the invention, provided for purposes of explanation,
  • FIGURE 2 is a diagrammatic cross-section taken on the line A-A of Figure 1,
  • FIGURE 3 is a diagrammatic cross-section taken on the line B-B of Figure 1
  • FIGURE 4 is a perspective view, from the underneath, of an air-bag unit in accordance with the invention.
  • FIGURE 5 is a cut-away perspective view from beneath of the air-bag unit of Figure 4.
  • the air-bag unit 1 comprises an outer housing or cover 2.
  • the cover 2 has an upper plate, not shown, defining a pair of doors through which an air-bag may emerge on inflation thereof.
  • a depending side-wall 3 Contained within the cavity that is defined by the upper cover or plate and the depending side-wall 3 is a gas generator 4.
  • the gas generator 4 comprises a central housing 5 mounted on a flat plate 6.
  • Contained within the housing or cover 2 is an air- bag 7, only part of which is shown.
  • the air-bag is initially in a rolled or folded condition.
  • the air-bag 7 has a throat region thereof secured to the plate 6 by rivets 8, or the like, so that gas outlet apertures 9 formed on the gas generator housing 5 are located on the interior of the air-bag.
  • the under-side of the plate 6 carries depending lugs 10 each defining an inwardly facing groove 10a. Received within the grooves 10a is a resilient retaining spring 11 which extends around the outer periphery of the plate 6.
  • the retaining spring may be used to effect a snap-fastening in a manner similar to that described in EP-A-1, 179,457.
  • the plate 6 carries two pairs of support arms 12 which are spaced inwardly from the outer periphery of the plate. Each pair of support arms 12 are aligned, and each pair of support arms carry a leaf-spring 13. In the orientation shown the leaf-spring 13 has a central horizontal portion 14 extending between the two support arms 12 and upwardly extending terminal portions 15 which extend upwardly from the support arms 12 towards the lower-most edges of the side-wall 3 of the cover defining the cavity which contains the air-bag 7.
  • the terminal portions 15 of the leaf-spring thus bias the cover upwardly relative to the gas generator 4, and the associated plate 6.
  • FIGS. 4 and 5 illustrate a practical embodiment of the invention, but with the air-bag being omitted.
  • a cover 20 is provided, the cover comprising an upper plate 21 provided with at least one line of mechanical weakness 22 so that the cover may rupture in a desired manner to form two doors when an air-bag located in a cavity beneath the cover is inflated.
  • the cover comprises a depending side-wall 23 which extends downwardly from the plate 21.
  • a plurality of apertures 24 are formed in the side-wall 23, for a purpose that will become clear from the following description.
  • the combination of the plate 21 and the depending side-wall 23 surround a cavity 25.
  • a gas generator 26 which is associated with an air-bag (not shown) which in a folded state substantially fills the cavity 25.
  • the gas generator 26 comprises a generally cylindrical housing having a radially outwardly extending planar flange 27.
  • the flange 27 is provided with a plurality of ears 28 which extend through the apertures 24, and which serve as engagement between the flange 27 and the side-wall 23.
  • the side-wall 23 may be resilient so as to effect a snap-fastening with the ears 28.
  • a plurality of lugs 29 extend downwardly from the under-surf ace of the flange, the lugs having apertures which receive a single sinuous retaining spring 30.
  • each leaf-spring 32 has a central portion 33 extending between the support arms 31, and two terminal inclined portions 34 which each extend from a support arm 31 upwardly to engage a lower edge of the side-wall 23.
  • the terminal portions 34 of the leaf-spring 32 therefore bias the cover upwardly relative to the gas generator.
  • the te ⁇ ninal portions 34 of each leaf-spring each pass adjacent immediately above part of the retaining spring 30.
  • the leaf-springs and the retaining spring are connected to form part of a horn or hooter actuation circuit such that when the cover is depressed, the terminal portions 34 of the leaf-springs 32 flex until at least one te ⁇ ninal portion 34 of one leaf-spring touches the adjacent retaining spring 30, thus completing the hooter actuation circuit.
  • the air-bag unit may be held in position by means of bolts or other fastenings, and an appropriate electrical contact, for example in the form of a metal strip, may be provided adjacent the leaf-spring to be touched by the leaf-spring when the cover of the air-bag unit is moved against the bias provided by the leaf-spring.

Abstract

In an air-bag unit a cover is provided with a depending side-wall (3) surrounding a cavity containing the air-bag (7). The cover can move relative to the air-bag and is biased upwardly by the end portions (15) of a leaf-spring (13) which is held on two depending supports (12). The terminal portions of the leaf-springs pass over a metallic element, for example a retaining spring (11). The leaf-spring (15) and the metallic element form part of a hooter circuit.

Description

"AN AIR-BAG UNIT"
THE PRESENT INVENTION relates to an air-bag unit, and more particularly relates to an air-bag adapted to be mounted within the steering- wheel of a motor vehicle.
It has been proposed to provide an air-bag unit mounted within the steering-wheel of a motor vehicle, the air-bag being adapted to be inflated in an accident situation to provide protection for the driver of the vehicle.
In many cases the air-bag unit has been mounted, to the steering-wheel, so that the entire unit, or at least part of the unit, may "float" relative to the steering-wheel. Typically such an air-bag unit is biased upwardly by means of helical springs, and may move or "float" downwardly, in response to manual pressure applied to the upper cover of the air-bag unit, with the springs being compressed. Typically, electrical contacts may be provided which are closed when the air-bag unit is moved downwardly, thus completing a horn circuit and sounding the horn on the motor vehicle.
One arrangement of this type is shown in GB-A-2,336,135. The illustrated arrangement is relatively complex, and, because of the number of parts, is relatively expensive to fabricate. It has been proposed previously to retain a "floating" air-bag unit of the type generally described above in position on the hub of the steering-wheel by utilising a long snap-in-spring. The snap-in-spring may have the form shown in EP-A- 1,179,457. The snap-in-spring passes across a plurality of apertures which may be formed either in a hub plate, or in a plate provided on the air-bag unit. The apertures in the plate are located to receive a corresponding plurality of feet. Each foot is in the form of a post, preferably with a chamfered end, and carrying a slot in at least one side-wall. As the feet are inserted through the apertures, so the chamfered ends of the feet displace the snap-in-spring, and when the slot in the side-wall of each foot is at alignment with the spring, the spring moves resiliently back towards its initial position, with part of the spring then being received in the slot in the side-wall of the foot. Each foot is thus trapped, and the air-bag unit is consequently mounted to the steering-wheel hub.
The present invention seeks to provide an improved air-bag unit.
According to this invention there is provided an air-bag unit, the air-bag unit comprising a cover, the cover being mounted for movement, there being at least one spring engaging part of the cover, the spring being configured to be deformed when the cover is moved, there being an electrical contact located adjacent the spring to be touched by part of the spring when the spring is deformed as a consequence of movement of the cover to complete a circuit, wherein the electrical contact forms part of a retaining spring carried by the gas generator, the retaining spring fomiing part of a "snap" fastening for retaining the air-bag unit in position.
Preferably the spring is a leaf-spring. Conveniently the leaf-spring is connected to a gas generator unit contained within the air-bag unit, part of the leaf-spring biasing a side-wall foraiing part of the cover, the cover being mounted to the gas generator unit for movement relative to the gas generator unit.
Advantageously there are two leaf-springs, each leaf-spring comprising a central portion and two terminal portions, each terminal portion being configured to engage part of a side-wall of the cover.
Alternatively the electrical contact may be a metal strip or some other metal component provided for that purpose.
In order that the invention may be more readily understood, and so that further features thereof may be appreciated, the invention will now be described, by way of example, with reference to the accompanying drawings in which:
FIGURE 1 is a diagrammatic view illustrating schematically components of an air-bag unit in accordance with the invention, provided for purposes of explanation,
FIGURE 2 is a diagrammatic cross-section taken on the line A-A of Figure 1,
FIGURE 3 is a diagrammatic cross-section taken on the line B-B of Figure 1, FIGURE 4 is a perspective view, from the underneath, of an air-bag unit in accordance with the invention, and
FIGURE 5 is a cut-away perspective view from beneath of the air-bag unit of Figure 4.
Referring initially to Figures 1 to 3, an air-bag unit 1 is illustrated schematically. The air-bag unit 1 comprises an outer housing or cover 2. The cover 2 has an upper plate, not shown, defining a pair of doors through which an air-bag may emerge on inflation thereof. Depending from the under-surface of the upper cover or plate is a depending side-wall 3. Contained within the cavity that is defined by the upper cover or plate and the depending side-wall 3 is a gas generator 4. The gas generator 4 comprises a central housing 5 mounted on a flat plate 6. Contained within the housing or cover 2 is an air- bag 7, only part of which is shown. The air-bag is initially in a rolled or folded condition. The air-bag 7 has a throat region thereof secured to the plate 6 by rivets 8, or the like, so that gas outlet apertures 9 formed on the gas generator housing 5 are located on the interior of the air-bag.
The under-side of the plate 6 carries depending lugs 10 each defining an inwardly facing groove 10a. Received within the grooves 10a is a resilient retaining spring 11 which extends around the outer periphery of the plate 6. The retaining spring may be used to effect a snap-fastening in a manner similar to that described in EP-A-1, 179,457.
The plate 6 carries two pairs of support arms 12 which are spaced inwardly from the outer periphery of the plate. Each pair of support arms 12 are aligned, and each pair of support arms carry a leaf-spring 13. In the orientation shown the leaf-spring 13 has a central horizontal portion 14 extending between the two support arms 12 and upwardly extending terminal portions 15 which extend upwardly from the support arms 12 towards the lower-most edges of the side-wall 3 of the cover defining the cavity which contains the air-bag 7.
The terminal portions 15 of the leaf-spring thus bias the cover upwardly relative to the gas generator 4, and the associated plate 6.
It is to be observed, from Figure 3, that parts of the spring 11, carried by the depending ears 10, are located beneath the inclined portions 15 of the leaf- spring 13.
It is to be understood that should a downward pressure be applied to the cover, the cover will move downwardly, against the bias provided by the terminal portions 15 of the leaf-springs 13. The terminal portions of the leaf- springs will deflect and will make physical contact with the retaining spring 11. Parts of a horn or hooter circuit may be connected to the retaining spring 11 and each leaf-spring 13, so that such physical contact between a leaf-spring 13 and the retaining spring 11 will complete a circuit, causing the hooter or horn to be sounded.
Figures 4 and 5 illustrate a practical embodiment of the invention, but with the air-bag being omitted.
Referring to Figures 4 and 5, a cover 20 is provided, the cover comprising an upper plate 21 provided with at least one line of mechanical weakness 22 so that the cover may rupture in a desired manner to form two doors when an air-bag located in a cavity beneath the cover is inflated. The cover comprises a depending side-wall 23 which extends downwardly from the plate 21. A plurality of apertures 24 are formed in the side-wall 23, for a purpose that will become clear from the following description.
The combination of the plate 21 and the depending side-wall 23 surround a cavity 25. Within the cavity is provided a gas generator 26 which is associated with an air-bag (not shown) which in a folded state substantially fills the cavity 25. The gas generator 26 comprises a generally cylindrical housing having a radially outwardly extending planar flange 27. The flange 27 is provided with a plurality of ears 28 which extend through the apertures 24, and which serve as engagement between the flange 27 and the side-wall 23. The side-wall 23 may be resilient so as to effect a snap-fastening with the ears 28.
In the embodiment shown a plurality of lugs 29 extend downwardly from the under-surf ace of the flange, the lugs having apertures which receive a single sinuous retaining spring 30.
As can be seen most clearly from Figure 4, associated with the flange are two pairs of depending support arms 31 which each carry a leaf-spring 32. The leaf-spring 32 has a central portion 33 extending between the support arms 31, and two terminal inclined portions 34 which each extend from a support arm 31 upwardly to engage a lower edge of the side-wall 23. The terminal portions 34 of the leaf-spring 32 therefore bias the cover upwardly relative to the gas generator. As can be seen, the teπninal portions 34 of each leaf-spring each pass adjacent immediately above part of the retaining spring 30.
The leaf-springs and the retaining spring are connected to form part of a horn or hooter actuation circuit such that when the cover is depressed, the terminal portions 34 of the leaf-springs 32 flex until at least one teπninal portion 34 of one leaf-spring touches the adjacent retaining spring 30, thus completing the hooter actuation circuit.
Whilst the invention has been described with reference to an embodiment in which a biasing leaf-spring engages a retaining spring, the retaining spring forming part of a "snap" connection to retain the air-bag unit in position, in alternative embodiments of the invention, the air-bag unit may be held in position by means of bolts or other fastenings, and an appropriate electrical contact, for example in the form of a metal strip, may be provided adjacent the leaf-spring to be touched by the leaf-spring when the cover of the air-bag unit is moved against the bias provided by the leaf-spring.
In the present Specification "comprises" means "includes or consists of and "comprising" means "including or consisting of.

Claims

CLAIMS:
1. An air-bag unit, the air-bag unit comprising a cover, the cover being mounted for movement, there being at least one spring engaging part of the cover, the spring being configured to be deformed when the cover is moved, there being an electrical contact located adjacent the spring to be touched by part of the spring when the spring is deformed as a consequence of movement of the cover to complete a circuit, wherein the electrical contact forms part of a retaming spring carried by a gas generator unit, the retaining spring forming part of a "snap" fastening for retaining the air-bag unit in position.
An air-bag unit according to Claim 1 wherein the spring is a leaf-spring.
3. An air-bag unit according to Claim 2 wherein the leaf-spring is connected to the gas generator unit contained within the air-bag unit, part of the leaf-spring biasing a side-wall forming part of the cover, the cover being mounted to the gas generator unit for movement relative to the gas generator unit.
4. An air-bag unit according to Claim 3 wherein there are two leaf-springs, each leaf-spring comprising a central portion and two tenninal portions, each terminal portion being configured to engage part of a side-wall of the cover.
PCT/SE2004/000165 2003-02-13 2004-02-10 An air-bag unit WO2004071819A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0303365.1 2003-02-13
GB0303365A GB2398277A (en) 2003-02-13 2003-02-13 Spring mounted air bag cover with electrical switch

Publications (1)

Publication Number Publication Date
WO2004071819A1 true WO2004071819A1 (en) 2004-08-26

Family

ID=9952983

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2004/000165 WO2004071819A1 (en) 2003-02-13 2004-02-10 An air-bag unit

Country Status (2)

Country Link
GB (1) GB2398277A (en)
WO (1) WO2004071819A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2094538B1 (en) * 2006-12-27 2011-09-14 Autoliv Development AB A safety arrangement
EP3178707B1 (en) * 2015-12-08 2018-07-18 Autoliv Development AB Steering wheel
CN109641563A (en) * 2016-08-29 2019-04-16 天合汽车安全系统股份有限公司 Driver airbag Installation Validation system
FR3083189B1 (en) * 2018-06-29 2021-12-10 Autoliv Dev REMOVABLE MOUNTING DEVICE FOR AN INFLATABLE CUSHION MODULE

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2336135A (en) * 1998-04-06 1999-10-13 Autoliv Dev Airbag arrangement
US6079737A (en) * 1997-01-16 2000-06-27 Toyoda Gosei Co., Ltd. Steering wheel and horn switch assembly for the steering wheel
WO2000074980A1 (en) * 1999-06-04 2000-12-14 Takata-Petri Ag Steering wheel
EP1179457A1 (en) * 2000-08-02 2002-02-13 Autoliv-Isodelta Vehicle steering wheel element with snap-in system and steering wheel comprising it
US20020043786A1 (en) * 2000-10-12 2002-04-18 Trw Automotive Safety Systems Gmbh & Co. Kg Vehicle steering wheel

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08207783A (en) * 1994-12-07 1996-08-13 Toyoda Gosei Co Ltd Steering wheel
JP3538977B2 (en) * 1995-07-21 2004-06-14 豊田合成株式会社 Steering wheel
US5738369A (en) * 1996-10-09 1998-04-14 Breed Automotive Technology, Inc. Snap-on air bag and horn switch module
IT1308842B1 (en) * 1999-09-24 2002-01-11 Gallino Plasturgia S R L OPERATOR DEVICE FOR HORN WARNING FOR A DIACTION WHEEL.
DE10016514B4 (en) * 2000-04-03 2006-04-06 Autoliv Development Ab Steering wheel with triggered by displacement of the airbag module horn function

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6079737A (en) * 1997-01-16 2000-06-27 Toyoda Gosei Co., Ltd. Steering wheel and horn switch assembly for the steering wheel
GB2336135A (en) * 1998-04-06 1999-10-13 Autoliv Dev Airbag arrangement
WO2000074980A1 (en) * 1999-06-04 2000-12-14 Takata-Petri Ag Steering wheel
EP1179457A1 (en) * 2000-08-02 2002-02-13 Autoliv-Isodelta Vehicle steering wheel element with snap-in system and steering wheel comprising it
US20020043786A1 (en) * 2000-10-12 2002-04-18 Trw Automotive Safety Systems Gmbh & Co. Kg Vehicle steering wheel

Also Published As

Publication number Publication date
GB2398277A (en) 2004-08-18
GB0303365D0 (en) 2003-03-19

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