EP1176384A2 - Pyrotechnischer Zünder mit einem elektrischen oder elektronischen Bauelement und/oder mit einem Steckverbinder - Google Patents

Pyrotechnischer Zünder mit einem elektrischen oder elektronischen Bauelement und/oder mit einem Steckverbinder Download PDF

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Publication number
EP1176384A2
EP1176384A2 EP01401465A EP01401465A EP1176384A2 EP 1176384 A2 EP1176384 A2 EP 1176384A2 EP 01401465 A EP01401465 A EP 01401465A EP 01401465 A EP01401465 A EP 01401465A EP 1176384 A2 EP1176384 A2 EP 1176384A2
Authority
EP
European Patent Office
Prior art keywords
connector
cavity
base
pins
initiator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP01401465A
Other languages
English (en)
French (fr)
Other versions
EP1176384A3 (de
Inventor
Jean-Paul Vidot
Patrice Chemiere
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.)
Giat Industries SA
Original Assignee
Giat Industries SA
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
Priority claimed from FR0009886A external-priority patent/FR2807155B1/fr
Application filed by Giat Industries SA filed Critical Giat Industries SA
Publication of EP1176384A2 publication Critical patent/EP1176384A2/de
Publication of EP1176384A3 publication Critical patent/EP1176384A3/de
Withdrawn legal-status Critical Current

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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
    • 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
    • F42B3/18—Safety initiators resistant to premature firing by static electricity or stray currents
    • F42B3/182—Safety initiators resistant to premature firing by static electricity or stray currents having shunting means

Definitions

  • the field of the invention is that of the initiators pyrotechnics, i.e. components for transmit a pyrotechnic effect in a chain pyrotechnic.
  • These initiators are for example intended to come activate a pyromechanism or initiate a composition gas generator in a security system for the automobile.
  • These initiator boxes are generally made by injection or overmolding.
  • the initiators are connected by connections electric to a centralized electronic circuit of vehicle safety control.
  • connections are generally formed by lugs deformable electrical devices or by connectors.
  • the pods also present problems from the point of view of the reliability of the connection therefore the security of the vehicle.
  • Such a shunt is a bulky intermediate component which comes between the pyrotechnic component and the connector and further complicates the connection often requiring the installation of adapters.
  • the initiator according to the invention allows with a reduced axial dimensions to simplify and make reliable the connection of the initiator to vehicle circuits.
  • the initiator authorizes the establishment a shunt circuit at a lower cost, for example when the manufacture of the initiator, and without resulting increase in axial dimensions or a complication making connections.
  • the subject of the invention is a pyrotechnic initiator comprising at least one pyrotechnic composition arranged inside a case composed of a case substantially cylindrical extended by at least two pins, initiator characterized in that the housing is secured to a base carrying holes receiving the pins and also having a cavity inside which extend the pins, cavity intended to receive an electrical or electronic component and / or a connector.
  • the cavity may in particular carry a shunt component ensuring, in the absence of a connector, a short circuit between the pins of the initiator.
  • the base may include means ensuring a axial immobilization of the shunt component and / or the connector in the cavity.
  • the cavity is cylindrical and has at least one notch intended for receive a projection integral with the shunt component and allowing its angular positioning.
  • the shunt component may consist of a flexible conductive strip integral with the base, strip ensuring a short circuit between the pins in the absence of connector.
  • the base can advantageously be molded onto the conductive coverslip.
  • the housing is advantageously arranged inside an envelope formed by the attachment of the base and of a top shell.
  • the envelope may have an external profile allowing its attachment to a gas generator or a pyromechanism.
  • the upper shell and the base can be joined together by welding with ultrasound.
  • an initiator pyrotechnic 1 according to a first embodiment of the invention comprises a pyrotechnic composition (not shown) arranged inside a housing 2 composed a substantially cylindrical case 4, made for example made of metal and extended by two pins 7a, 7b.
  • a pyrotechnic composition (not shown) arranged inside a housing 2 composed a substantially cylindrical case 4, made for example made of metal and extended by two pins 7a, 7b.
  • a pyrotechnic composition (not shown) arranged inside a housing 2 composed a substantially cylindrical case 4, made for example made of metal and extended by two pins 7a, 7b.
  • a substantially cylindrical case 4 made for example made of metal and extended by two pins 7a, 7b.
  • This case 2 is arranged inside an envelope 3 formed by the joining of two parts: a base 16 and an upper shell 17.
  • the shell and the base are made by injection a plastic material, for example of the polyamide type or polycarbonate. They are joined together one of the other for example by ultrasonic welding.
  • the base 16 has a bearing face 18 on which a circular groove 19 is made and it is crossed by two holes 20, 21 connected by a notch 22.
  • the holes 20 and 21 are intended to let the pins 7a and 7b of the housing 2.
  • the notch 22 makes it possible to receive the bends of pins 7a and 7b.
  • the upper shell 17 has a bearing face which has a circular toothing 27 intended to cooperate with the groove 19 of base 16.
  • the upper shell 17 defines a volume internal cylindrical 28 which is intended to receive the case 2. This volume therefore has the same diameter as the outer diameter of the housing 2 and it has a height equal to that of the case.
  • the thickness e of the upper shell is of the order 0.5 mm. This shell is thin enough to can be broken by the initiation of composition pyrotechnic contained in the housing 2.
  • the base 16 also includes a cavity 40 to the interior of which extend the pins 7a, 7b. This cavity with a parallelepiped profile and it is intended to receive a connector (not shown).
  • the base also includes an elastic spout 41 which deforms when a connector is inserted and which has an abutment surface 42 making it possible to prohibit the connector exit from cavity 40.
  • This spout is formed in one piece with the base 16.
  • the initiator according to the invention is assembled as follows.
  • Ultrasonic welding is done in one way known by applying a sonotrode from a welding machine on a conical profile 31 of the upper shell 17.
  • Circular teeth 27 penetrate mounting in the groove 19 which allows to concentrate stresses caused by ultrasonic vibrations during welding. We thus locate a warm-up at level of groove / toothing contact which allows welding.
  • the tightness of the initiator vis-à-vis the pyromechanism and relative to the gases generated during operation is ensured by the support of the bottom 6 on the support face 18, pressure also having the effect of applying firmly the bottom and the case 4 on the support face which slightly penetrate the housing 2 into the shell lower 16 and increases the tightness.
  • the initiator according to the invention is therefore perfectly waterproof and can also receive reliably and waterproof a standard connector with rectangular section.
  • the connector being made integral with the initiator thanks to the spout 41 which will cooperate with a notch in the connector.
  • a electrical or electronic component such as a capacitor or a shunt.
  • the internal part of the initiator formed by the housing 2 may be the same whatever the external geometry of the complete component and that of the connector which will have to adapt to it.
  • Figure 3 thus shows a second mode of realization of an initiator according to the invention.
  • the cavity 40 is here cylindrical and it is delimited at the level of its opening by a circular bead 43.
  • the cavity 40 is intended to receive a cylindrical component, for example a connector or a shunt component as will be described later.
  • the bead 43 has a surface stop 44.
  • a circular release groove 45 is disposed between the bead 43 and the cylindrical surface internal of the cavity 40.
  • the base 16 finally comprises two notches 46a, 46b cutting the bead 43 and extending from a lower face 47 from the base 16 to beyond the groove 45.
  • notches are intended to receive projections complementary to a connector or a shunt component and allow angular positioning of the component or connector with respect to the base 16.
  • Figure 5 shows this same initiator including inside the cavity 40 a shunt component 48.
  • a known shunt component is formed by an insulating body 49 having a cylindrical external profile of the same diameter as the cavity 40 of the initiator 1, carrying two projections 50a and 50b intended to cooperate with the notches 46a and 46b of the base 16.
  • the bottom 51 of the body carries two holes 52a, 52b intended to receive pins 7a and 7b of the initiator.
  • the body 49 has a middle notch 53 which is delimited by the bottom 51 and two flat surfaces 54a and 54b.
  • the flat surface 54a has in the middle part a semi-cylindrical rib 55 while the flat surface 54b has a rectangular groove 56.
  • the rib and the groove are intended to cooperate with additional profiles carried by a connector so as to ensure an installation of this one with a correct orientation with respect to the shunt 48 component.
  • flat surfaces 54a and 54b will also provide a connector guidance.
  • the body 49 of the component 48 carries a notch 57 rectangular which is parallel to the surface 54a and which receives a conductive strip 58 (for example brass).
  • This strip is shown alone in FIG. 7c. It has two tongues 59a, 59b connected together by a bar 60. It is formed from a single piece of stamped and folded brass.
  • the tabs are folded so that when the strip 58 is placed in its notch 57, the ends of the tongues 59a, 59b are located respectively opposite the holes 52a, 52b.
  • the tongue 59b is shown in FIG. 7a in its position of contact with a pin of the initiator.
  • the tongue 59a is shown in its rest position, shunt component 48 outside the initiator.
  • the protective short circuit is therefore eliminated as soon as the introduction of the connector. It is however re-established upon removal of the connector.
  • the level of security obtained with respect to electrostatic discharges is optimal.
  • Figure 6 shows in perspective the shunt component 48 (conductive strip not shown) positioned in front the initiator 1 according to the invention and before its installation in the cavity 40 thereof.
  • the dimensions of the cavity 40 have been defined by in order to receive a standard shunt 48 component from trade.
  • This component is introduced into the cavity 40. It positions in abutment at the bottom of it. It is adjusted by tightly in the cavity so as to ensure its maintenance axial.
  • the axial size of the assembly is reduced to maximum. Safety is assured with mounting extremely simplified.
  • a standard connector 62 can then be connected to initiator 1. It will erase the shunt as it was previously described. He will be made integral of the initiator through the cooperation of deformable tabs (integral with the connector and not shown) with the abutment surface 44 delimiting the circular groove of clearance 45.
  • Figures 8a and 8b show an initiator following a third embodiment of the invention.
  • This mode differs from the previous mode in that the shunt component is not a separate part mounted in the cavity 40 but only by a strip conductive 58 secured to the base 16.
  • the cavity 40 of the base has a profile substantially rectangular (see Figure 8b) which is intended to receive a connector and which plays the same role as the middle notch of the component described above in reference to Figures 7a, 7b.
  • the cavity 40 carries on one of its planar faces a semi-cylindrical rib 55 and on the other flat surface a rectangular groove 56.
  • the rib and the groove are intended to cooperate with additional profiles carried by a connector so as to ensure an installation of this one with a correct orientation with respect to the pins.
  • the surfaces planes of the cavity 40 also provide guidance of the connector.
  • the conductive strip 58 is identical to that shown in Figure 7c.
  • the lamella 58 again has two tabs 59a, 59b connected together by a bar 60. It ensures a short circuit between pins 7a and 7b when the initiator is not connected to a connector.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Air Bags (AREA)
  • Connector Housings Or Holding Contact Members (AREA)
EP01401465A 2000-07-27 2001-06-07 Pyrotechnischer Zünder mit einem elektrischen oder elektronischen Bauelement und/oder mit einem Steckverbinder Withdrawn EP1176384A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0009886A FR2807155B1 (fr) 2000-03-30 2000-07-27 Initiateur pyrotechnique pouvant etre equipe d'un composant electrique ou electronique et/ou d'un connecteur
FR0009886 2000-07-27

Publications (2)

Publication Number Publication Date
EP1176384A2 true EP1176384A2 (de) 2002-01-30
EP1176384A3 EP1176384A3 (de) 2002-03-20

Family

ID=8853001

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01401465A Withdrawn EP1176384A3 (de) 2000-07-27 2001-06-07 Pyrotechnischer Zünder mit einem elektrischen oder elektronischen Bauelement und/oder mit einem Steckverbinder

Country Status (1)

Country Link
EP (1) EP1176384A3 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004020933A1 (en) * 2002-08-30 2004-03-11 Special Devices, Inc. Initiator having integral features for orienting and holding an insertable electrical shunt
WO2004052690A2 (en) * 2002-12-11 2004-06-24 Autoliv Asp, Inc. Initiator assembly with integrated shorting element

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5334025A (en) 1991-12-10 1994-08-02 Trw Repa Gmbh Electrical plug connection on a pyrotechnical gas generator provided with an electrical igniter
FR2720493A1 (fr) 1994-05-31 1995-12-01 Giat Ind Sa Initiateur pyrotechnique.
EP0740369A2 (de) 1995-04-27 1996-10-30 DODUCO GMBH + Co Dr. Eugen DÀ¼rrwächter Kurzschlusssicherung für elektrische Zünder von Airbags
US5621183A (en) 1995-01-12 1997-04-15 Trw Inc. Initiator for an air bag inflator
US5733135A (en) 1995-12-06 1998-03-31 Trw Inc. Air bag inflator assembly with shorting clip

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2807155B1 (fr) * 2000-03-30 2003-03-21 Giat Ind Sa Initiateur pyrotechnique pouvant etre equipe d'un composant electrique ou electronique et/ou d'un connecteur

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5334025A (en) 1991-12-10 1994-08-02 Trw Repa Gmbh Electrical plug connection on a pyrotechnical gas generator provided with an electrical igniter
FR2720493A1 (fr) 1994-05-31 1995-12-01 Giat Ind Sa Initiateur pyrotechnique.
US5621183A (en) 1995-01-12 1997-04-15 Trw Inc. Initiator for an air bag inflator
EP0740369A2 (de) 1995-04-27 1996-10-30 DODUCO GMBH + Co Dr. Eugen DÀ¼rrwächter Kurzschlusssicherung für elektrische Zünder von Airbags
US5733135A (en) 1995-12-06 1998-03-31 Trw Inc. Air bag inflator assembly with shorting clip

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004020933A1 (en) * 2002-08-30 2004-03-11 Special Devices, Inc. Initiator having integral features for orienting and holding an insertable electrical shunt
WO2004052690A2 (en) * 2002-12-11 2004-06-24 Autoliv Asp, Inc. Initiator assembly with integrated shorting element
WO2004052690A3 (en) * 2002-12-11 2004-09-02 Autoliv Asp Inc Initiator assembly with integrated shorting element

Also Published As

Publication number Publication date
EP1176384A3 (de) 2002-03-20

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