WO2004003456A1 - Initiator with a bridgewire in contact with slurry-loaded pyrotechnic charge at a position of relatively low void formation - Google Patents
Initiator with a bridgewire in contact with slurry-loaded pyrotechnic charge at a position of relatively low void formation Download PDFInfo
- Publication number
- WO2004003456A1 WO2004003456A1 PCT/IB2003/002486 IB0302486W WO2004003456A1 WO 2004003456 A1 WO2004003456 A1 WO 2004003456A1 IB 0302486 W IB0302486 W IB 0302486W WO 2004003456 A1 WO2004003456 A1 WO 2004003456A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- ignition charge
- initiator
- bridgewire
- charge
- ignition
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B3/00—Blasting cartridges, i.e. case and explosive
- F42B3/10—Initiators therefor
- F42B3/195—Manufacture
- F42B3/198—Manufacture of electric initiator heads e.g., testing, machines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B3/00—Blasting cartridges, i.e. case and explosive
- F42B3/10—Initiators therefor
- F42B3/12—Bridge initiators
- F42B3/124—Bridge initiators characterised by the configuration or material of the bridge
Definitions
- the present invention generally relates to the field of pyrotechnic initiators, and more particularly to an initiator with a bridgewire in contact with a slurry-loaded pyrotechnic charge at a position of relatively low void formation.
- Pyrotechnic initiators have many uses in industrial and consumer applications. One important use is in triggering the inflation of airbags in motor vehicles. Significant efforts have been made in the automotive industry to reduce the cost of manufacturing reliable airbag initiators, yet such initiators must meet demanding performance standards.
- a firing current having at least a predetermined "all-fire” level and duration must resistively generate heat in the bridgewire of the initiator that is reliably (e.g., 99.9999% of the time with at least 95% confidence) sufficient to ignite the initiator's charge. It is also generally required that the application of current up to a predetermined "no fire” level and duration (e.g., 200mA for 10 seconds at 85°C) will reliably not result in the bridgewire generating sufficient heat to ignite the charge.
- an initiator includes a bridgewire that is in contact with a slurry-loaded pyrotechnic charge at a position of relatively low void formation, at an edge of the slurry.
- Figure 1 is a partial side sectional view of an embodiment of an initiator according to the present invention, showing a bridgewire placed at a bottom edge of the slurry in a thin section of dried slurry charge.
- Figxtr ⁇ 2 is a partial side sectional view of an alternate embodiment of an initiator according to the present invention, showing a bridgewire placed at a top edge of the dried slurry charge .
- Figure 3 is a partial side sectional view of another alternate embodiment of an initiator according to the present invention, showing a bridgewire placed at both a top and bottom edge of two layers of dried slurry charge.
- a suitable initiator for use in the present invention preferably includes a number of features typically found in pyrotechnic initiators, such as are depicted in assignee's co-pending application S.N.
- a glass-to-metal sealed header assembly is hermetically attached to a charge can, an insulator cup, and a molded insulating body.
- a slurry ignition charge is loaded and dried to form a monolithic solid, preferably with a height that is a small portion of the height of the charge enclosure.
- An output charge is also preferably loaded (preferably in slurry form) on top of the ignition charge after the ignition charge has dried.
- a "slip plane" may also be provided between the ignition charge
- a suitable header assembly may include an eyelet 20 that is typically made of a metal such as 304L stainless steel, and is generally cylindrical with a passage defined through it to permit a feedthrough to be created by the hermetic sealing of the glass 22 and the center pin 30 therein.
- the glass 22 may preferably consist of sodium aluminosilicate, barium alkali silicate, or other well-known glasses.
- a bridgewire 28 extends from a radially extending surface of the center pin 30 to a radially extending surface of the eyelet 20.
- the bridgewire 28 may be formed from a high resistance metal alloy such as platinum-tungsten or "NICHROME" nickel-chromium alloy.
- the bridgewire 28 has flattened opposite end portions that are fixed to the center pin 30 and the eyelet 20 by electrical resistance welds. These opposite end portions of the bridgewire 28 become flattened (not shown) under the pressure applied by the welding electrodes that are used to form the resistance welds.
- a suitable header, slurry charge composition, and bridgewire for use in the present invention may be such as are described in assignee's co-pending applications,
- a slurry ignition charge 24 is placed in a layer on the surface of the header around the bridgewire 28 in a heat- receiving relationship with the bridgewire 28, and is allowed to dry to form a monolithic solid.
- the bridgewire 28 is located at a bottom edge of the slurry ignition charge 24, where the slurry experiences the least formation of voids 32, because the slurry tends to dry at its edges first, leaving voids interior to the dried edges.
- the axial spinning technique taught in assignee's co-pending application S.N. 10/ , entitled "Axial
- bridgewire 28 is sandwiched between the edges of two layers of dried slurry charge. To ensure that both of those edges contain a minimum of voids 32, such an embodiment should be made by loading and drying layer 1, and then loading and drying layer 2.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Air Bags (AREA)
- Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03732845A EP1523649A1 (en) | 2002-07-01 | 2003-06-26 | Initiator with a bridgewire in contact with slurry-loaded pyrotechnic charge at a position of relatively low void formation |
JP2004517054A JP2005531742A (en) | 2002-07-01 | 2003-06-26 | Initiator with bridge wire in contact with slurry-containing pyrotechnic agent at relatively low void formation |
AU2003239263A AU2003239263A1 (en) | 2002-07-01 | 2003-06-26 | Initiator with a bridgewire in contact with slurry-loaded pyrotechnic charge at a position of relatively low void formation |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/188,004 US20040000248A1 (en) | 2002-07-01 | 2002-07-01 | Initiator with a bridgewire in contact with slurry-loaded pyrotechnic charge at a position of relatively low void formation |
US10/188,004 | 2002-07-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004003456A1 true WO2004003456A1 (en) | 2004-01-08 |
Family
ID=29780081
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IB2003/002486 WO2004003456A1 (en) | 2002-07-01 | 2003-06-26 | Initiator with a bridgewire in contact with slurry-loaded pyrotechnic charge at a position of relatively low void formation |
Country Status (5)
Country | Link |
---|---|
US (1) | US20040000248A1 (en) |
EP (1) | EP1523649A1 (en) |
JP (1) | JP2005531742A (en) |
AU (1) | AU2003239263A1 (en) |
WO (1) | WO2004003456A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6976430B2 (en) | 2002-09-02 | 2005-12-20 | Daicel Chemical Industries, Ltd. | Igniter for inflator and method of manufacturing thereof |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0510551A2 (en) * | 1991-04-24 | 1992-10-28 | Dynamit Nobel Aktiengesellschaft | Bridge wire initiator |
US5686691A (en) * | 1995-12-22 | 1997-11-11 | Oea, Inc. | Slurry-loadable electrical initiator |
US6343000B1 (en) * | 1998-04-21 | 2002-01-29 | Toshiba Hokuto Electronics Corporation | Ignition device and method for manufacturing thereof |
US20020069781A1 (en) * | 2000-12-07 | 2002-06-13 | Vahan Avetisian | Recessed glass header for pyrotechnic initiators |
US20020069782A1 (en) * | 2000-12-08 | 2002-06-13 | Vahan Avetisian | Pyrotechnic initiator with a narrowed sleeve retaining a pyrotechnic charge and methods of making same |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3447416A (en) * | 1967-09-01 | 1969-06-03 | Us Army | Electric initiator |
US3971320A (en) * | 1974-04-05 | 1976-07-27 | Ici United States Inc. | Electric initiator |
US5454320A (en) * | 1992-10-23 | 1995-10-03 | Quantic Industries, Inc. | Air bag initiator |
US5621183A (en) * | 1995-01-12 | 1997-04-15 | Trw Inc. | Initiator for an air bag inflator |
DE19733353C1 (en) * | 1997-08-01 | 1998-12-10 | Nico Pyrotechnik | Ignition unit for a personal protection device in a motor vehicle |
US6758922B2 (en) * | 2001-10-05 | 2004-07-06 | Autoliv Asp, Inc. | Low firing energy initiator pyrotechnic mixture |
-
2002
- 2002-07-01 US US10/188,004 patent/US20040000248A1/en not_active Abandoned
-
2003
- 2003-06-26 WO PCT/IB2003/002486 patent/WO2004003456A1/en not_active Application Discontinuation
- 2003-06-26 JP JP2004517054A patent/JP2005531742A/en active Pending
- 2003-06-26 AU AU2003239263A patent/AU2003239263A1/en not_active Abandoned
- 2003-06-26 EP EP03732845A patent/EP1523649A1/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0510551A2 (en) * | 1991-04-24 | 1992-10-28 | Dynamit Nobel Aktiengesellschaft | Bridge wire initiator |
US5686691A (en) * | 1995-12-22 | 1997-11-11 | Oea, Inc. | Slurry-loadable electrical initiator |
US6343000B1 (en) * | 1998-04-21 | 2002-01-29 | Toshiba Hokuto Electronics Corporation | Ignition device and method for manufacturing thereof |
US20020069781A1 (en) * | 2000-12-07 | 2002-06-13 | Vahan Avetisian | Recessed glass header for pyrotechnic initiators |
US20020069782A1 (en) * | 2000-12-08 | 2002-06-13 | Vahan Avetisian | Pyrotechnic initiator with a narrowed sleeve retaining a pyrotechnic charge and methods of making same |
Also Published As
Publication number | Publication date |
---|---|
US20040000248A1 (en) | 2004-01-01 |
JP2005531742A (en) | 2005-10-20 |
AU2003239263A1 (en) | 2004-01-19 |
EP1523649A1 (en) | 2005-04-20 |
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