CA2110825C - Dual stage inflator - Google Patents

Dual stage inflator

Info

Publication number
CA2110825C
CA2110825C CA002110825A CA2110825A CA2110825C CA 2110825 C CA2110825 C CA 2110825C CA 002110825 A CA002110825 A CA 002110825A CA 2110825 A CA2110825 A CA 2110825A CA 2110825 C CA2110825 C CA 2110825C
Authority
CA
Canada
Prior art keywords
gas
squib
combustion chamber
wafers
gas generating
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.)
Expired - Fee Related
Application number
CA002110825A
Other languages
French (fr)
Other versions
CA2110825A1 (en
Inventor
Christopher Hock
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.)
Autoliv ASP Inc
Original Assignee
Morton International LLC
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 Morton International LLC filed Critical Morton International LLC
Publication of CA2110825A1 publication Critical patent/CA2110825A1/en
Application granted granted Critical
Publication of CA2110825C publication Critical patent/CA2110825C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/26Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
    • B60R21/264Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using instantaneous generation of gas, e.g. pyrotechnic
    • B60R21/2644Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using instantaneous generation of gas, e.g. pyrotechnic using only solid reacting substances, e.g. pellets, powder
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/26Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
    • B60R2021/26029Ignitors
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/26Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
    • B60R2021/26029Ignitors
    • B60R2021/26041Ignitors of elongated shape
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/26Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
    • B60R21/263Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using a variable source, e.g. plural stage or controlled output
    • B60R2021/2633Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using a variable source, e.g. plural stage or controlled output with a plurality of inflation levels

Abstract

A device is provided for increasing the surface area of the gas generant used in an automotive safety air bag module.
Depending on crash conditions, the surface area of the gas generant is increased by shattering the gas generant wafers. One embodiment utilizes a squib having a high brisant zone which upon activation shatters the gas generant wafers. Alternatively, a dual function squib is used which can produce mechanical forces which force a breaking object to impact on the gas generating wafers thereby shattering them and increasing the surface area of the gas generant.

Description

211082~

I ~ PATENT

DUAL STAGE INFLATOR

BACKGROUND OF THE INVENTION
Field of the Invention The present invention relates to gas generators for inflating vehicle inflatable restraint cushions, commonly known as air bags, so as to provide impact protection to occupants of the passenger vehicles. More particularly, this invention relates to an improvement in providing varying rates of inflation of the air bag dependent on crash conditions and/or occupant conditions.
Description of Related Art An air bag restraint system, referred to as a module, typically includes a canister which encloses a gas generator or as, lS it is commonly known, an inflator, and at least part of an air bag, and a cover which conceals the module from view. When the vehicle is involved in a collision, a crash signal initiates operation of the inflator to cause the air bag to deploy. The inflator produces an inert gas (e.g., nitrogen) which is directed under pressure into the air bag to force the air bag out of the canister incorporated in the module and into the passenger compartment of the vehicle.
In a pyrotechnic type inflator, gas is produced by the burning of a gas generating material. As the air bag is forced out of the container, pressure exerted on the cover causes selected portions of the cover to separate in a predetermined manner along tear seams to enable the air bag to be directed into the passenger compartment. As the air bag is directed into the passenger compartment, it is inflated by the continued flow of gas produced by the inflator.
With a pyrotechnic type inflator, the rate at which the gas ~' PATENT

generant must burn in order to provide gas at a sufficient rate to inflate the air bag, so as to protect the occupant, is dependent on a number of factors; i.e., the speed at which the vehicle is moving, the severity of the crash, the size and location of the occupant and the temperature of the inflator. For example, when a vehicle moving at a moderate rate of speed (30 miles per hour/50 kph) with an inflator at a temperature of approximately 70F (21C) is involved in a collision, a "normal" rate of gas production from the inflator must be sufficient to deploy the air bag within the time required to protect the occupants. When a vehicle moving at a high rate of speed (50 mph/8s kph) impacts another vehicle moving at approximately the same speed, a higher rate of gas production from the inflator may be required to provide the same level of protection to the occupants.
An additional concern is the capability to compensate for the reduced reaction rate of cold gas generant by increasing the gas production rate of the gas generant. When a vehicle moving at a high rate of speed (50 mph/85 kph) with an inflator that is cold, due to being maintained at sub-zero temperatures -20F (-29C) collides with a stationary object, it may be necessary to compensate for the reduced rate of gas production caused by the low temperature in order to deploy the air bag in sufficient time to protect the occupants.
In addition, in order to provide a less sudden and softer action of the air bag cushion more closely tailored to the size and weight of the occupant so as to reduce the chance of possible injury to the occupant because of air bag cushion deployment, it is desired that the initial inflation of the air bag cushion be more gradual but with the same or only a slightly longer time required 27 ~ 08~ PATENT

for total inflation. There is a greater need for this gradual inflation when a small child is present on the passenger side.

Prior art solutions to these problems have been accomplished by two-stage, or dual performance inflators which use separate cylinders, bulkheads, and alternated ignition trains incorporated in inflators of this type. Such prior art solutions are disclosed in Kirchoff et al., U.S. Patent No. 3,972,545; Schneiter el al., U.S. Patent No. 4,358,998; and Blanchard, U.S. Patent No.
0 3,713,667.

Kirchoff et al., U.S. Patent No. 3,972,545, which is assigned to the assignee of the present invention, discloses a consumable partition in a gas generator divided into two chambers~each chamber containing gas generant material and being ignitable by a separate igniter. An impact sensor determines whether one or both of the squibs are fired on impact, depending upon the force of a collision, and hence, the rate at which the gas bag is filled with gas.
.o Schneiter el al., U.S. Patent No. 4,358,998, which invention is assigned to the assignee of the present invention, discloses an igniter which causes the gas generating material in the inflator to ignite in a progressive manner so as to inflate the bag slowly at the onset but more rapidly later as inflation progresses. The igniter has a disc delay between two portions thereof whereby the gas generant material around one portion is ignited immediately and then after a delay, the gas generating material around the other portion is ignited.
o Blanchard discloses a pressurized container for providing gas - - ~
211082~

PATENT

to an air bag cushion, where the passage communicating with the air bag has multiple orifices. Each orifice is closed to the pressure vessel by a diaphragm rupturable by electrically fired detonators.
The number of orifices to be opened is dependent on the force of a collision and the rate at which the air bag is to be filled with gas. A similar solution to this problem has been suggested by Vos, U.S. Patent No. 3,741,580, which discloses a multiple level flow rate of a pressurized fluid to a cushion by selective operation of serially disposed flow control orifices in accordance with predetermined levels of intensity of impact.

SUMMARY OF THE INVENTION

An object of this invention is to provide performance equivalent to that of a two-stage or dual performance inflator without the usual complication of separate cylinders, bulkheads and alternate ignition trains normally incorporated in an inflator of this type.

Another object of this invention is to provide a gas generator which produces gas at different rates depending on the output of a crash sensor which detects varying amounts of force produced by an impact between a passenger vehicle and another object.

Another object of this invention is to provide a gas generator which can compensate for the reduced reaction rate of a gas generating material due to below ambient temperature reactants.

Another object of this invention is to provide a gas generator which can provide different rates of gas production depending on the weight of an occupant.

PATENT

Another object of this invention is to provide a gas generator which can provide gas at different rates depending on the severity of a collision.

These and other objectives of the invention, which will become apparent from the following description, have been achieved by a novel gas generator which incorporates a secondary squib coupled with shaped wafers to accommodate dual performance of an air bag inflator while maintaining a single enclosed stack of gas generant, with its accompanying simplicity. Dual performance is accomplished by shattering of a stack of gas generant wafers by means of pyrotechnic or mechanical means through use of a secondary squib. Ignition of the basic pyrotechnic is to be accomplished by functioning of the primary squib. In the event of a crash, the electronics module delivers an electrical impulse to a primary squib which lights an ignition train, which in turn lights the gas generant. In the event of the necessity of higher performance, the electronics module delivers a secondary electrical impulse to a different squib in the gas generator. The output of this squib is designed to shatter the generant wafers in a stack in one of several different ways. The mechanical output of this squib is designed to drive a mechanical plate or plug into the gas generant wafers. Alternately, the squib is designed to create a shock wave which propagates into the generant stack, thus fracturing the gas generant wafers. The squib also serves to increase the ignition sources into the generant, causing the inflator to burn faster. The increased surface area created by this fracturing serves to increase performance of the inflator. The reaction rate of the gas generant material itself remains constant. In order to closely control the fracture and gas production rate of the gas generant, the wafers can be shaped in such a way as to repeatably fracture -- 211082~

PATENT

along established fracture lines. The generant wafers may be shaped with a pattern on the inside diameter and the outside diameter. Alternately, they may be scored or raised in sections along either face of the wafer in order to provide a preferred and repeatable fracture path.

The gas generator of this invention comprises an elongated housing including a tubular combustion chamber having a pair of end portions, and means for closing the end portions thereby defining at least one combustion chamber. A gas generating material formed into a plurality of gas generating wafers is arranged along the length of the tubular combustion chamber and spaced from each other in a side-by-side array forming a generant stack. At least one igniter means to ignite the gas generating wafers is inserted in spaced relation to the gas generant. A squib is provided which upon activation by a signal from a sensor ignites the igniter means. A vehicle inflatable restraint cushion is attached in spaced relation to the gas generator. Aperture means are provided in the tubular combustion chamber to direct generated gas from the tubular combustion chamber to the vehicle inflatable restraint cushion. At least one squib has a high brisant output which upon activation by a second signal from the sensor shatters the gas generating wafers thereby increasing the surface area of the gas generating material.
Further, the gas generator of this invention may comprise an elongated housing including a tubular combustion chamber having a pair of end portions and means for closing the end portions thereby defining at least one combustion chamber. A gas generating material formed into a plurality of gas generating wafers is arranged along the length of the tubular combustion chamber and 211082~

PATENT

spaced from each other in a side-by-side array forming a gas generant stack. At least one igniter means to ignite the gas generating wafers is inserted in spaced relation to the gas generant. A radially extending plate is located in spaced relation to at least one end of the gas generating wafer stack. A
squib is provided which, upon activation by a signal from a sensor, ignites the igniter means. A vehicle inflatable restraint cushion is attached in spaced relation to the gas generator. Aperture means are provided in the tubular combustion chamber to direct generated lo gas from the tubular combustion chamber to the vehicle inflatable restraint cushion. At least one squib has a high output which upon activation by a second signal from a sensor causes the radially extending plate to impact on the gas generating wafers thereby causing the gas generating wafers to shatter.
Alternatively, the gas generator of this invention may comprise an elongated housing including a tubular combustion chamber having a pair of end portions and means for closing the end portions thereby defining at least one combustion chamber. A gas generating material formed into a plurality of gas generating wafers is arranged along the length of the tubular combustion chamber and spaced from each other in a side-by-side array. The gas generating wafers have through apertures defining inner walls generally in the central region of each wafer. An igniter tube having a first end and a second end, passes through the apertures in the gas generating wafers. A fracture means located in spaced relation to at least one end of the igniter tube. A squib is provided which upon activation by a signal from a sensor ignites the igniter tube. A vehicle inflatable restraint cushion is attached to a canister containing the gas generator.

PATENT

Apertures are provided on the outer surface of the tubular combustion chamber for directing generated gas from the tubular combustion chamber into a vehicle inflatable restraint cushion. At least one squib has a high output mode which upon activation by a second signal from the sensor impacts on the fracture means forcing the fracture means into at least one end of the tube forcing the tube to radially expand and engaging the inner wall surfaces of the aperture of the gas generating wafers causing the gas generating wafers to shatter. The shattering of the gas generant wafers increases the surface area thereof. Also, metal rods passing through apertures in the gas generant can be used when an igniter tube is not used. In this embodiment, fracture means -would be forced between at least two rods which are in spaced relation from one another, thereby pushing the rods apart and shattering the gas generant.

BRIEF DESCRIPTION OF THE DRAWINGS

With this description of the invention, a detailed description follows with reference being made to the accompanying figures of drawings which form part of the specification, in which like parts are designated by the same reference numbers, and of which:

Fig. 1 is a cross-section view illustrating a conventional gas generator of having a single stage inflator;

Fig. 2 is a cross-section view illustrating the gas generator of this invention with a dual function squib attached to one end of the combustion chamber;
Fig. 3 is an enlargement of the cross-sectional view of the dual 211082~

PATENT

function squib of Fig. 2;

Fig. 4 is a cross-section view illustrating the gas generator of this invention with a dual function squib attached at both ends of the combustion chamber;

Fig. 5 is a cross-section view illustrating the gas generator of this invention with a dual function squib and a impact plate attached at one end of the combustion chamber and a standard squib attached at the opposite end of the combustion chamber;

Fig. 6 is a cross-section view illustrating the gas generator of this invention with a dual function squib and a breaking body attached at one end of the combustion chamber and a standard squib attached at the opposite end of the combustion chamber;

Fig. 6a is a cross-section view illustrating the gas generator of Fig. 6 with rods installed in place of the igniter tube;

Fig. 7 and 7a are enlargements of the cross-sectional view of the dual function squib of Figs. 6 and 6a, and Fig. 7b is a single function high output squib;

Figs. 8, 8a, 9, 9a, 10, and lOa are front plan views and side views respectively of a generant wafer illustrating fracture lines;

Figs. 11 through 14 are a series of graphs illustrating the pressure vs. time curves for the invention produced under different operating conditions; and Fig. 15 is an end plan view illustrating an air bag in a deployed ~ 2110825 PATENT

condition with a module canister containing a gas generator.

DESCRIPTlON OF THE PRIOR ART

Referring to Fig. 1, a gas generator of the prior art shown generally at 10 is provided for producing a gas to inflate an air bag cushion (not shown) from a module canister (not shown). The gas generator 10 includes an elongated housing 12 defining a combustion chamber 14. The combustion chamber 14 has a first end 16 and a second end 18 covered by a first end cap 20 and a second end closure 22 respectfully. A standard squib 24 for initiating igniter material 26 is normally located at one end of the gas generator 10. The igniter material 2 6, is contained in an open-ended igniter tube 28, having apertures 29 in the wall 32 thereof, located generally in the radial center of the gas generator 10.
The outside of the igniter tube 28 iS wrapped with aluminum foil 30 to contain the igniter material 26 within the igniter tube 28.
Extending radially outward from the igniter tube 28 is gas generant material which is formed into wafers 34. The wafers 34 are arranged along the length of the combustion chamber 14 and separated from the first end 16 and the second end 18 by a spacer 36 and a damper pad 38 respectively. Radially outward of the wafers 34 is a filter pack 40 made of filter screen for cooling the generated gas and filter material to remove particulate matter. A
number of vent holes 42 pass through the outer wall 44 of the elongated housing 12 of gas generator 10. The inner surface ~6 of the outer wall 44 is covered with aluminum foil 48 to stop moisture from reaching the gas generant. A standard squib 2~ or standard squib output as described herein is one which lights igniter material 26 without significant brisance or output which would result in the modification of the physical structure of the gas -- 21108~

PATENT

generant material by mechanical means.

DETAILED DESCRIPTION OF THE INVENTION

As best seen in Fig. 2, a gas generator of this invention shown generally at 50 is provided for producing a gas to inflate an air bag cushion 52 (as shown in Fig. 15) from a module canister 5~
(as shown in Fig 15). The gas generator 50 includes an elongated housing 56 defining a combustion chamber 58. The combustion chamber 58 has a first end 60 and a second end 62 covered by a first end cap 64 and a second end cover 66, respectively. A dual function squib 68 of this invention for initiating igniter material 70 is normally located at one end of the gas generator 50. The igniter material 70, is contained in an open-ended igniter tube 72 having through apertures 74 in the wall 76 thereof, located generally in the radial center of the gas generator 50. The outside of the igniter tube 72 is wrapped with aluminum foil 78 to contain the igniter material 70 within the igniter tube 72.
Extending radially outward from the igniter tube 72 is gas generant material which is formed into wafers 80. The gas generating wafers 80 have through apertures 82 which define inner wall 8~ generally in the central region of each wafer 80. The wafers 80 are arranged along the length of the combustion chamber 58 and are separated from the first end cap 64 and the second end cover 66 by a spacer 86 which is in the form of a hollow cylinder and a damper pad 88, respectively. Radially outward of the wafers 80 is filter pack so made of filter screen for cooling the gas generated and filter material to remove particulate matter from the gas which work in combination with the gas generant to provide a cool and filtered gas. The filter pack 90 is similar to that disclosed in U.S. Patent No. 4,878,690. The '690 patent is -
2 1 1 ~82~
PATENT

assigned to the assignee of the present invention. A number of vent holes 92 passing through the outer wall 94 of the elongated housing 56 of ~as generator 50. The inner surface 96 of the outer wall 94 is covered with a barrier foil 98 to stop moisture from reaching the gas generant.

The dual function squib 68 as shown in Fig. 2 and as shown enlarged in Figs. 3 and 3a contains a normal firing zone 100 and a high brisance firing zone 102. A normal firing zone 100 or standard squib output as described herein is one which lights igniter material 70 without significant brisance or output which would result in the modification of the physical structure of the gas generating material by mechanical means. A standard squib 2~
is shown in Fig 1 for comparison. The normal firing zone 100 contains for example, approximately 130 mg. of a mixture of TiKCl04 (powder form of grades standardly used in pyrotechnics). The high-brisance firing zone 102 contains, for example, approximately 20 mg- of (PbN3) and 110 mg. of HMX , octahydrotetranitrotetrazocine (powder form of grades standardly used in pyrotechnics). Under "normal" conditions (light-weight occupant in the passenger side seat) the normal firing zone 100 would be triggered by a first output from a sensor (not shown) which in turn lights the igniter material 70 burning within igniter tube 72. The burning igniter material 70 burns through barrier foil 78 and ignites generant wafers 80. Under special conditions (an adult occupant in the passenger side seat) the high brisance firing zone 102 would be triggered by a second output from a sensor (not shown) in place of, simultaneously with, or prior to the firing of the normal firing zone 100 to produce the maximum rate of gas production. It is believed that the shock wave emanating from the high brisance \~ ~

2 1 1 0 ~2~
PATENT

firing zone would shatter the generant wafers 80, thereby increasing the surface area of the generant wafers 80. The increased surface area will increase the gas production rate of the generant wafers, and thereby increase the quantity of gas produced per unit of time. The firing of the normal firing zone 100 is followed by a time delay (5 to 10 milliseconds) after which the high-brisance squib 102 fires result in a gas production rate intermediate to the minimum and maximum production rates. This increased gas production rate will be manifested in many different forms, for example, increased volumetric flow rate of the gas, increased pressure within the gas generator S0, and the production of a given volume of gas within a reduced period of time.

The brisance of the high brisance firing zone 102 should be such that it shatters a substantial amount of the generant wafers 80. The shattering of the generant wafers 80 produces at least a 100% increase in the surface area of the generant, and preferably a 400% increase, and more preferably a 900% increase in the surface area of the gas generant 80. Dual function squibs 68 can be attached to both ends of the gas generator 50 as shown in Fig. 4 to shatter a higher percentage of the gas generant wafers 80.

In a second embodiment of this invention, as shown in Fig. 5 and as shown enlarged in Figs. 7 and 7a, a dual function squib 10~
of this invention having a standard firing zone 100, as described hereinabove, and a high output firing zone 106. A single function squib 105 having a high output firing zone, as shown in Fig. 7b can also be used. The high output firing zone 106 may contain, for example 200 mg BKN03 107 and 30 mg (lead trinitroresorcinate) 109 or, as it is more commonly known, lead styphnate C6H(No2)3(O2Pb).

PATENT

These compounds are used in powder form of grades standardly used in pyrotechnics. The standard firing zone 100 would function as described hereinabove. The output of the high output firing zone 106 would be triggered during special conditions. The output of 5the high output firing zone 106 would impact on fracture plate 108 which would in turn be driven into the stack of generant wafers 80 causing them to shatter, thereby increasing the surface area of the gas generant wafers 80. Again, as with the high brisance output squib the output of the dual function squib 104 should be such that 10it shatters a substantial amount of the generant wafers 76. The shattering of the generant wafers 80 produces at least a 100%
increase in the surface area of the generant, and preferably a 400~
increase, and more preferably a 900% increase in the surface area of the generant. A standard squib 24 can be attached to the 15opposite end of the gas generator 50, as shown in Fig. 5, or the opposite end can be sealed with a second end closure 22, as shown in Fig 1.

In another embodiment of this invention, as shown in Fig. 6, 20a high output dual function squib 10~ having a standard firing zone 100, as described hereinabove, and a high output firing zone 106 as described hereinabove. The high output firing zone 106 may be prepared as discussed hereinabove. The output of the high output firing zone 106 would be triggered during special conditions. The 25output of the high output firing zone 106 would impact on a breaking body 110 which would in turn impact on the end of the igniter tube 72 causing it to split lengthwise. It is believed the sections of the split igniter tube 72 would push against the inside of the generator wafer aperture causing the generator wafers 30to fracture, thereby increasing the surface area of the generant.
To aid in the efficient splitting of igniter tube 72 a rupture seam Zl 1 0~5 PATENT

112 or a number of rupture seams 112 may be placed along the length of the igniter tube 72 to insure that the igniter tube 72 will split in the desired manner. In gas generator designs which do not use an igniter tube 72 a plurality of rods 114 which can be pushed apart by the breaking body 110 may be used, as shown in Fig 6a.

Again, as with the high brisance output squib, the output of the high output firing zone squib 54 in conjunction with the breaking body 110 should be such that is shatters a substantial amount of the generant wafers 80. The shattering of the generant wafers 80 produce at least a 100% increase in the surface area of the generant, and preferably a 400~ increase, and more preferably a 900% increase in the surface area of the generant. A standard squib 24 can be attached to the opposite end of the gas generator 50, as shown in Fig. 5, or the opposite end can be sealed with a second end closure 22, as shown in Fig 1.

The gas generant wafers 80 used with this invention are similar to those described in Schneiter, U.S. Patent No. 4,890,860, which patent is assigned to the assignee of the present invention.
In order for the gas generant wafers 80 to function correctly with the high brisance firing zone 102 and the high output firing zone 106 in conjunction with the fracture plate 108 or breaking body 110, screen spacers should not be used. Instead, raised zones or bumps 116, as shown in Figs. 2, 9 and 9a should be used to separate the wafers. To insure that the generant wafers 80 will shatter in the desired manner when required fracture lines 118 on gas generant wafers 80, as shown in Figs. 8, 8a, 9, and 9a may be placed on the surface of the generant wafer 80. Also, an aperture in the form of 21 1 oa~
PATENT

a star pattern 119, as shown in Figs 10 and lOa, may be used to insure that the generant wafers 80 will shatter in the desired manner.

The filter pack 90 used with this invention to filter and cool the gas produced by the gas generant wafers 80 can be any filter pack 90 standardly known to those having ordinary skill in the art.
For example, one filter pack 90 which may be utilized is described in U.S. Patent No. 4,878,690 to Cunningham, which patent is assigned to the assignee of this invention Design of a dual function squibs 68 and 10~ closely mimics design of a single output squib. A normal output squib (not shown in detail) consists typically of a solid metal ring (or header) which encases a quantity of glass. The glass has been melted to provide a high pressure hermetic seal within the header (referred to as a Glass-To-Metal-Seal or GTMS). Within the glass is one or more metal pins. The glass serves to electrically insulate the pin from the header. Welded between the pin and the header is a small diameter high resistance wire (bridgewire). In close proximity to the bridgewire is a quantity of pyrotechnic material. When an electrical current is passed through the bridgewire by means of the pin and header, its temperature rises. This increase in temperature is passed to the pyrotechnic which ignites when sufficient energy is absorbed by it.

The design of the dual function, as shown in Figs. 3 and 3a and 7, squib utilizes two pyrotechnic charges, the normal firing zone 100 and a high brisance 102 or high output firing zone 106, separated one from another by a metal ring or header 120 so that PATENT

the ignition and consumption of one charge does not immediately ignite the other. In addition, the charges are ignited by two different bridgewires, a primary bridgewire 122, for the normal firing zone 100, and a secondary brigdewire 124 for the high brisance firing zone 102 or the high output firing zone 106. These bridgewires are separated one from another in such a manner that the passage of current through one does not cause current to pass through the other. In order to assure this, the design of the dual output squib contains at least two quantities of glass or other insulating material, two bridgewires 122 and 124 or other ignition means, and at least three electrical connections, central pin 126, an inner pin 128, and an outer pin 130.

In the squib of the present invention an electrical current is passed through the central pin 126, through the primary bridgewire 122 across the first glass insulator 132 and through the inner metal ring or header 120, igniting the normal firing zone 100 which vents out the opposite end. A second current is passed through the inner pin 128 inner metal ring or header 120, through the secondary bridgewire 12~ across the second glass insulator 13~ and through the outermost metal ring or header 136, igniting the high brisance firing zone 102 or the high output firing zone 106 which vents out the opposite end, surrounding the output of the previous case. In this manner, output of the dual function squib 68 can be provided by the interior charge only; the exterior charge only; the interior charge and exterior charge at the same time; or the interior charge and exterior charge with a time delay between them. Other arrangements with multiple pins in a single quantity of glass or side-by-side are possible. Other components aid in manufacture or functioning such as coatings, platings, shunt mixes, and electrical insulators typically used for squib design are not shown for ~1 1 08~5 PATENT

simplicity.

The igniter tube used with this invention is any igniter known in the art. Modification of the igniter tube 72 by providing 5rupture seams 112 may be helpful in aiding in the splitting of the igniter tube 72 in response to an impact by the breaking body 110.
The rupture seams can be cut into the surface of the igniter tube 72 by mechanical means such as metal cutting or metal scoring tools.
The gas generator housing 5~ for use with this invention can be any standardly known to those of ordinary s~ill in the art.
Modification of the second end 62 and the second end cover 66 may be necessary to accommodate the second dual function squib 68. In 15order to minimize the weight the gas generator 50, housing 5~, the first end cap 64 and the second end cover 66, respectively, are composed of aluminum.

The gas generator 50 is assembled as by inserting the igniter 20tube 72, damper pad 88, gas generate wafers 80, and spacer 86 into the elongated housing 56. The first end cap 6~ containing the dual function squib is attached to the first end 60 of elongated housing 56 preferably by an inertia welding process similar to that described in U.S. Patent No. 4,547,342, which patent is assigned to 25the assignee of this invention. The squib of this invention could be inserted into the first end cap 64. The second end cover 66 can be standard end or it can be modified to hold a standard squib 24 or one of the novel squibs of this invention; for example, a dual function squib 68 having a high brisance firing zone 102 or the 30dual function squib 104 having a high output zone 106.

~ 211082~

PATENT

A sensor as described in Jones, U.S. Patent No. 3,718,332, or a similar sensor, could be used to sense varying levels of impact.
Temperature sensors known in the art would indicate when the temperature at which the inflator is stored is below a critical temperature. A weight sensor could detect the presence of a small person or child in the passenger seat. An appropriate microprocessor can be used to produce a time delay between the triggering of the normal firing zone 100 and the high brisance firing zone 102 or high output firing zone 106 resulting in a gas production rate between that produced by the normal firing zone 100 and the high brisance firing zone 102 or high output firing zone 106.

Functioning of the gas generator 50 begins with an electrical signal from a crash sensor (not shown) through lead wires (not shown) to the squib 68. The squib 68, under normal conditions, when a light-weight occupant is present (Type I), fires the normal firing zone 92 which initiates burning of the igniter which in turn effects combustion of the igniter material 70 passing through apertures 7~ in the wall 76 thereof, located generally in the radial center of the gas generator 50. The outside of the igniter tube 72 is wrapped with aluminum foil 78 in the igniter tube 72 and the aluminum foil 78 to ignite the plurality of wafers 80. The burning wafers 76 release inflation gases which flow through the filtering pack 90 and through the inflator housing 56 into the air bag cushion 52. The pressure rise for a "normal" air bag inflation is shown in Fig. 11.

When the presence of a heavier or adult occupant is sensed (Type II) in the passenger seat by an appropriate sensor a signal would be sent to the high brisant firing zone 102 of the squib as - 211082~

PATENT

well as the normal firing zone 100 of the squib. The output of the high brisant output zone 102 would shatter the gas generant wafers 80 thereby increasing the burn rate of the gas generant. The ignition of the gas generant would proceed as described in the preceding paragraph. The pressure rise for this "higher speed" air bag inflation is shown in Fig. 12.

Squibs located at both ends, as shown in Fig. 4, would provide better coverage when higher speed or "severe" crash conditions (Type III) are detected. Should the crash sensor detect a higher speed (Type III) collision, an appropriate sensor a signal would be sent to the high brisant firing zone 102 squibs at both ends of the inflator. The pressure rise for the inflation of the air bag cushion under "higher speed" crash conditions is shown in Fig. 13.
Should sensors detect "intermediate" crash conditions, crash conditions between Type I and Type II, the normal firing zone 100 would be triggered. A microprocessor or similar means would determine the suitable delay period after which the high brisance firing zone 102 or high output firing zone 106 would be triggered.
For example, after an appropriate delay (5 to 10 milliseconds) the high brisance firing zone 102 would be triggered resulting in an intermediate rate of gas production. The pressure rise for the inflation of the air bag cushion under "intermediate" crash conditions is shown in Fig. 14.

Thus, in accordance with the invention, there has been provided a gas generator which produces gas at different rates depending on the output of a crash sensor which detects varying amounts of force produced by an impact between a passenger vehicle and another object. There has also been provided a gas generator 211082~
PATENT

which can compensate for the reduced reaction rate of a gas generating material due to below ambient temperature reactants.
There has also been provided a gas generator which can provide different rates of gas production depending on the weight of an occupant. Additionally, there has been provided a gas generator which can provide gas at different rates depending on the severity of a collision.

With this description of the invention in detail, those skilled in the art will appreciate that modification may be made to the invention without departing from the spirit thereof. Therefore, it is not intended that the scope of the invention be limited to the specific embodiments that have been illustrated and described.
Rather, it is intended that the scope to the invention be determined by the scope of the appended claims.

Claims (20)

I claim:
1. A gas generator for inflating a vehicle inflatable restraint cushion, the generator comprising:

an elongated housing including a tubular combustion chamber having a pair of end portions;

means for closing said end portions thereby defining at least one combustion chamber;

a gas generating material formed into a plurality of gas generating wafers, arranged along the length of said tubular combustion chamber and spaced from each other in a side-by-side array;

at least one igniter means to ignite said gas generating wafers; at least one squib which upon activation ignites said igniter means;
a vehicle inflatable restraint cushion;

and aperture means in said tubular combustion chamber for directing generated gas from said tubular combustion chamber to a vehicle inflatable restraint cushion;

wherein at least one squib has a high brisant output which upon activation shatters said gas generating wafers thereby increasing the surface area of said gas generating material.
2. The gas generator of claim 1 wherein said at least one squib is a dual output squib having a standard output mode and a high brisant output.
3. The gas generator of claim 1 wherein said at least one squib is attached to an end portion of said combustion chamber.
4. The gas generator of claim 2 wherein said dual output squib is attached to one end of said combustion tube and a standard squib is attached to the other end of said combustion chamber.
5. The gas generator of claim 2 wherein dual output squibs are attached to both ends of said combustion tube.
6. The gas generator of claim 1 having a combustion chamber further comprising a cooling means which works in combination with the gas generant to cool the gas.
7. The gas generator of claim 4 having a combustion chamber further comprising a filter means which works in combination with the gas generant to filter the gas.
8. The gas generator of claim 1 wherein said gas generating wafers have fracture zones on the surface thereof wherein said gas generating wafers shatter along said fracture zones.
9. A gas generator for inflating a vehicle inflatable restraint cushion, the generator comprising:

an elongated housing including a tubular combustion chamber having a pair of end portions;

means for closing said end portions thereby defining at least one combustion chamber;

a gas generating material formed into a plurality of gas generating wafers, arranged along the length of said tubular combustion chamber and spaced from each other in a side-by-side array;

at least one igniter means to ignite said gas generating wafers; a radially extending plate located in spaced relation to one end of said gas generating wafers;

at least one squib which upon activation ignites said igniter means, a vehicle inflatable restraint cushion; and aperture means in said tubular combustion chamber for directing generated gas from said tubular combustion chamber to the vehicle inflatable restraint cushion;

wherein at least one squib has a high output which upon activation causes said radially extending plate to impact on said gas generating wafers thereby causing said gas generating wafers to shatter.
10. The gas generator of claim 9 wherein said squib is a dual output squib having a standard output mode and a high output mode.
11. The gas generator of claim 9 wherein at least one squib is attached to an end portion of said combustion chamber.
12. The gas generator of claim 10 wherein said dual output squib is attached to one end of said combustion tube and a standard squib is attached to the other end of said combustion chamber.
13. The gas generator of claim 10 wherein dual output squibs are attached to both ends of said combustion tube.
14. The gas generator of claim 9 having a combustion chamber further comprising a cooling means.
15. The gas generator of claim 13 having a combustion chamber further comprising a filter means.
16. The gas generator of claim 9 wherein said gas generating wafers have fracture zones on the surface thereof wherein said gas generating wafers preferably shatter along said fracture zones.
17. A gas generator for inflating a vehicle inflatable restraint cushion, the generator comprising:

an elongated housing including a tubular combustion chamber having a pair of end portions;

means for closing said end portions thereby defining at least one combustion chamber, said tubular combustion chamber comprising;

a gas generating material formed into a plurality of gas generating wafers, arranged along the length of said tubular combustion chamber and spaced from each other in a side-by-side array, said gas generating wafers having through apertures generally in the central region of each wafer, said apertures defining inner wall surfaces;

an igniter tube having a first end, a second end, said tube passing through said apertures in said gas generating wafers;

at least one fracture means located in spaced relation to at least one end of said igniter tube;

at least one squib which upon activation initiates said igniter tube;

a vehicle inflatable restraint cushion; and aperture means in said tubular combustion chamber for directing generated gas from of said tubular combustion chamber to a vehicle inflatable restraint cushion, wherein at least one squib has a high output mode which upon activation impacts on said fracture means forcing said fracture means into at least one end of said tube forcing said tube to radially expand and engaging said inner wall surfaces of said aperture of said gas generating wafers causing said gas generating wafers to shatter thereby increasing the surface area of said gas generating material.
18. The gas generator of claim 17 wherein said igniter tube has fracture lines running the length thereof.
19. The gas generator of claim 17 wherein said squib is a dual output squib having a standard output mode and a high output mode.
20. The gas generator of claim 17 wherein at least one squib is attached to an end portion of said combustion chamber.
CA002110825A 1993-03-03 1993-12-07 Dual stage inflator Expired - Fee Related CA2110825C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/025,505 US5368329A (en) 1993-03-03 1993-03-03 Dual stage inflator
US08/025,505 1993-03-03

Publications (2)

Publication Number Publication Date
CA2110825A1 CA2110825A1 (en) 1994-09-04
CA2110825C true CA2110825C (en) 1996-04-16

Family

ID=21826477

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002110825A Expired - Fee Related CA2110825C (en) 1993-03-03 1993-12-07 Dual stage inflator

Country Status (8)

Country Link
US (2) US5368329A (en)
EP (1) EP0613806B1 (en)
JP (1) JP2614406B2 (en)
KR (1) KR970011514B1 (en)
AU (1) AU653113B1 (en)
CA (1) CA2110825C (en)
DE (1) DE69306237T2 (en)
ES (1) ES2097463T3 (en)

Families Citing this family (59)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5551343A (en) * 1994-01-21 1996-09-03 Morton International, Inc. Special geometry generant bodies for automotive gas bag inflator
JPH07215162A (en) * 1994-01-27 1995-08-15 Daicel Chem Ind Ltd Gas generator for air bag
US5483896A (en) * 1994-07-12 1996-01-16 Morton International, Inc. Pyrotechnic inflator for an air bag
US5531475A (en) * 1994-10-21 1996-07-02 Trw Vehicle Safety Systems Inc. Air bag inflator and method of assembly
US5589141A (en) * 1995-03-31 1996-12-31 Atlantic Research Corporation Use of mixed gases in hybrid air bag inflators
US5556132A (en) * 1995-04-13 1996-09-17 Trw Inc. Vehicle occupant restraint with auto ignition material
US5585597A (en) * 1995-05-15 1996-12-17 Trw Vehicle Safety Systems Inc. Air bag inflator
US20070132220A1 (en) * 1995-06-07 2007-06-14 Breed David S Occupant Classification and Airbag Deployment Suppression Based on Weight
US20070135982A1 (en) 1995-06-07 2007-06-14 Automotive Technologies International, Inc. Methods for Sensing Weight of an Occupying Item in a Vehicular Seat
US5759219A (en) * 1995-09-22 1998-06-02 Morton International, Inc. Unitary drop-in airbag filters
US5730462A (en) 1995-10-31 1998-03-24 Morton International, Inc. Shrink wrap generant cartridge
US5746793A (en) * 1996-01-16 1998-05-05 Morton International, Inc. Reinforced ceramic air bag filters
EP0785110A3 (en) * 1996-01-16 1998-03-18 Morton International, Inc. Wrapped gas generant cartridge
US5593181A (en) * 1996-03-15 1997-01-14 Morton International, Inc. Generant wafer core ignition system for passenger side airbag inflator
US5820162A (en) 1996-03-21 1998-10-13 Airbelt Systems, Llc. Airbag system inflator
DE29609703U1 (en) * 1996-05-31 1996-09-26 Trw Repa Gmbh Gas bag
US5999871A (en) * 1996-08-05 1999-12-07 Delphi Technologies, Inc. Control method for variable level airbag inflation
US5691499A (en) * 1996-08-07 1997-11-25 Morton International, Inc. Bridgewire ladder initiator
US5863067A (en) * 1996-12-05 1999-01-26 Trw Vehicle Safety Systems Inc. Vehicle occupant protection apparatus
US5871228A (en) * 1997-01-21 1999-02-16 Autoliv Asp, Inc. Airbag module with sized inflator
US5893583A (en) * 1997-04-23 1999-04-13 Trw Vehicle Safety Systems Inc. Inflator for an inflatable vehicle occupant protection device
US6126197A (en) * 1997-04-24 2000-10-03 Talley Defense Systems, Inc. Lightweight discoidal filterless air bag inflator
US6474684B1 (en) 1997-04-24 2002-11-05 Talley Defense Systems, Inc. Dual stage inflator
US5880534A (en) * 1997-07-16 1999-03-09 Autoliv Asp, Inc. Sequencing system for variable level output inflators
US6189924B1 (en) 1997-11-21 2001-02-20 Autoliv Asp, Inc. Plural stage inflator
US6032979C1 (en) 1998-02-18 2001-10-16 Autoliv Asp Inc Adaptive output inflator
US6106010A (en) * 1998-03-31 2000-08-22 Trw Vehicle Safety Systems Inc. Vehicle occupant protection system having a dual stage inflator
DE69919501T2 (en) * 1998-09-28 2005-01-20 Daicel Chemical Industries, Ltd., Sakai Igniter for a gas generator
US6412815B1 (en) * 1998-09-28 2002-07-02 Daicel Chemical Industries, Ltd. Gas generator for air bag and air bag device
US6168197B1 (en) 1999-04-09 2001-01-02 Daimlerchrysler Corporation Airbag deployment device and control
US6139055A (en) * 1999-05-10 2000-10-31 Autoliv Asp, Inc. Adaptive heated stage inflator
US6149193A (en) 1999-08-06 2000-11-21 Breed Automotive Technology, Inc. Variable output inflator
US6199906B1 (en) * 1999-08-12 2001-03-13 Breed Automotive Technology, Inc. Dual stage pyrotechnic inflator
DE10016167B4 (en) * 2000-03-31 2012-04-26 Trw Airbag Systems Gmbh & Co. Kg Gas generator and apparatus for generating gas
US6890001B1 (en) * 2000-06-01 2005-05-10 Autoliv Asp, Inc. Elongated inflator device, assembly and method of use
US6314889B1 (en) 2000-06-12 2001-11-13 Autoliv Asp, Inc. Adaptive output pyrotechnic inflator
AU2001287965A1 (en) * 2000-09-19 2002-04-02 Ims Inc. Multi-deployment airbag inflator
US6692022B2 (en) * 2001-07-14 2004-02-17 Delphi Technologies, Inc. Active venting of an airbag module
EP1487676A2 (en) * 2002-03-26 2004-12-22 Automotive Systems Laboratory, Inc. Multiple chamber dual stage inflator
US6966578B2 (en) * 2003-01-24 2005-11-22 Autoliv Asp, Inc. Adaptive output, toroidal-shaped pyrotechnic inflator
DE20303836U1 (en) * 2003-03-11 2003-07-24 Trw Airbag Sys Gmbh Inflator for a vehicle occupant restraint system
DE20307603U1 (en) * 2003-05-15 2003-09-25 Trw Airbag Sys Gmbh Lighter for use in a vehicle occupant protection device
JP4094529B2 (en) * 2003-11-10 2008-06-04 本田技研工業株式会社 Ignition device
US7243946B2 (en) 2003-11-18 2007-07-17 Automotive Systems Laboratory, Inc. Peroxide linear inflator
US7125042B2 (en) * 2004-03-25 2006-10-24 Automotive Systems Laboratory, Inc. Inflator using reversing axial flow
US7789018B2 (en) * 2004-04-02 2010-09-07 Automotive Systems Laboratory, Inc. Gas generator assembly
US7380815B2 (en) * 2004-04-05 2008-06-03 Autoliv Asp, Inc. Lower side piller passenger inflatable safety restraint assembly
US7293798B2 (en) 2004-04-05 2007-11-13 Automotive Systems Laboratory, Inc. Pyrotechnic linear inflator
US8622419B2 (en) * 2004-07-27 2014-01-07 Automotive Systems Laboratory, Inc. Vehicle component with integral inflator
JP4643283B2 (en) * 2005-01-28 2011-03-02 ダイセル化学工業株式会社 Gas generator for airbag
US20060186654A1 (en) * 2005-01-28 2006-08-24 Daicel Chemical Industries, Ltd. Gas generator for air bag
FR2888315B1 (en) * 2005-07-05 2007-09-21 Livbag Soc Par Actions Simplif PYROTECHNIC GAS GENERATOR FOR MOTOR VEHICLE SAFETY
US7637533B2 (en) * 2006-01-25 2009-12-29 Daicel Chemical Industries, Ltd. Gas generator
IL184216A0 (en) * 2007-06-25 2008-01-06 Rafael Advanced Defense Sys Two-stage airbag inflation system with pyrotechnic delay
JP5462051B2 (en) * 2010-03-30 2014-04-02 株式会社ダイセル Combustion chamber structure including cushion member
RU2459149C2 (en) * 2010-09-22 2012-08-20 Открытое акционерное общество "Федеральный научно-производственный центр "Научно-исследовательский институт прикладной химии" Cold pure nitrogen generator
WO2015127317A1 (en) * 2014-02-20 2015-08-27 Tk Holdings Inc. Airbag inflator pad
JP6284420B2 (en) * 2014-04-23 2018-02-28 株式会社ダイセル Inflator
JP6633985B2 (en) * 2016-07-20 2020-01-22 株式会社ダイセル Gas generator

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3741580A (en) * 1971-08-27 1973-06-26 Gen Motors Corp Occupant restraint system
US3718332A (en) * 1971-08-27 1973-02-27 Gen Motors Corp Occupant restraint system
US3713667A (en) * 1971-08-27 1973-01-30 Gen Motors Corp Occupant restraint system
US3972545A (en) * 1975-03-10 1976-08-03 Thiokol Corporation Multi-level cool gas generator
US4358998A (en) * 1980-02-04 1982-11-16 Thiokol Corporation Igniter for a pyrotechnic gas bag inflator
US4547342A (en) * 1984-04-02 1985-10-15 Morton Thiokol, Inc. Light weight welded aluminum inflator
US4817828A (en) * 1986-10-03 1989-04-04 Trw Automotive Products Inc. Inflatable restraint system
US4890860A (en) * 1988-01-13 1990-01-02 Morton Thiokol, Inc. Wafer grain gas generator
US4878690A (en) * 1988-03-09 1989-11-07 Morton Thiokol, Inc. Light weight vehicle restraint bag inflator
US5005486A (en) * 1989-02-03 1991-04-09 Trw Vehicle Safety Systems Inc. Igniter for airbag propellant grains
DE4006741C1 (en) * 1990-03-03 1991-08-22 Bayern-Chemie Gesellschaft Fuer Flugchemische Antriebe Mbh, 8261 Aschau, De Gas generator to inflate protective bag - includes moulded propellant body in ring-shaped combustion chamber, that extends through central tube
US4998751A (en) * 1990-03-26 1991-03-12 Morton International, Inc. Two-stage automotive gas bag inflator using igniter material to delay second stage ignition
WO1992022440A1 (en) * 1991-06-17 1992-12-23 Asahi Kasei Kogyo Kabushiki Kaisha Gas generator for air bag
US5346254A (en) * 1993-02-01 1994-09-13 Trw Inc. Inflator assembly

Also Published As

Publication number Publication date
ES2097463T3 (en) 1997-04-01
KR970011514B1 (en) 1997-07-11
US5368329A (en) 1994-11-29
JP2614406B2 (en) 1997-05-28
DE69306237D1 (en) 1997-01-09
JPH0725309A (en) 1995-01-27
DE69306237T2 (en) 1997-04-24
US5398966A (en) 1995-03-21
AU653113B1 (en) 1994-09-15
EP0613806A1 (en) 1994-09-07
CA2110825A1 (en) 1994-09-04
EP0613806B1 (en) 1996-11-27

Similar Documents

Publication Publication Date Title
CA2110825C (en) Dual stage inflator
US5345876A (en) Hybrid inflator
EP1658204B1 (en) Pyrotechnique side impact inflator
US6019389A (en) Air bag inflator
US6199906B1 (en) Dual stage pyrotechnic inflator
KR100646586B1 (en) Gas generator for air bag and air bag device
EP1361971B1 (en) Dual chamber inflator
EP0604001B1 (en) Inflator assembly
US3972545A (en) Multi-level cool gas generator
US5863066A (en) Multiple stage air bag inflator
US5992881A (en) Vehicle occupant protection apparatus with multiple stage inflator
US3868124A (en) Inflating device for use with vehicle safety systems
EP0449506B1 (en) Two-stage automotive gas bag inflator using igniter material to delay second stage ignition
KR100591689B1 (en) Inflator with multiple initiators
US6425601B1 (en) Air bag module
US7950693B2 (en) Dual stage inflator
KR100190892B1 (en) Side impact air bag inflator
JPH03548A (en) Two-chamber type expnader for air bag
US3944249A (en) Inflating device for use with vehicle safety systems
JPH11263185A (en) Air bag inflator
US6976704B2 (en) Adaptive output airbag inflation device
KR20110051223A (en) Inflator for an airbag
WO1996040541A1 (en) Airbag inflator system
US6296274B1 (en) Apparatus for inflating a side curtain
JP2002516208A (en) Two-stage gas generator

Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed