Universal squib connector for a gas generator

• US 5,241,910 A
• Filed: 04/05/1991
• Issued: 09/07/1993
• Est. Priority Date: 04/05/1991
• Status: Expired due to Term

• Current Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Original Assignee: Morton International Incorporated (Autoliv Incorporated)
• Inventors: Cunningham, Donald J., Chandler, Virginia E., Allard, John E.
• Primary Examiner(s): TUDOR, HAROLD JAY
• Application Number:
  US07/680,979
• Time in Patent Office: 886 Days
• Field of Search: 102/202.2, 102/202.3, 102/530, 102/531, 102/202.9, 280/735, 280/741, 439/607, 439/608, 439/620, 439/441, 439/552, 439/555, 439/557, 439/559, 439/677, 439/680
• US Class Current: 102/530
• CPC Class Codes: B60R 2021/26029 Ignitors
• CPC Class Codes: B60R 21/2644 using only solid reacting substances, e.g. pellets, powder
• CPC Class Codes: F42B 3/04 for producing gas under pressure generators of inflation fluid especially adapted for vehicle air bags B60R21/26
• CPC Class Codes: F42B 3/103 Mounting initiator heads in initiators; Sealing-plugs
• CPC Class Codes: F42B 3/188 having radio-frequency filters , e.g. containing ferrite cores or inductances F42B3/185 takes precedence

Abstract

A universal squib connector for automobile driver and passenger air bag collision protection systems includes a ferrite bead having two holes in spaced relation with an electric terminal positioned in each hole for making electrical contact with an associated one of the protruding pins of a pin type electric squib. The arrangement enables the use of a single configuration of gas generator and a single configuration of electric initiator or squib for the igniter system of the gas generator while providing EMI/RFI protection and the advantages realizable from both pin type and pig tail type connection of the collision sensor to the input conductors or lead wires to the squib and also the electrical system of the vehicle according to the preferences of individual automobile manufacturers.

Claims

1. A universal squib connector for providing a permanent pig tail connection to a pin type electric initiator or squib comprising,

connecting terminals,

a ferrite bead having holes therethrough in spaced relation, each of said holes having a first end and a second end, with one of said terminals positioned in one of said holes and another of said terminals positioned in another of said holes, the spacing of said holes being such as to allow each of the protruding pins of a pin type electric initiator or squib to enter the first end of an individually associated one of said holes to make electrical contact with an individually associated one of said terminals, said ferrite bead providing EMI/RFI protection in a region surrounding said terminals, and

a plurality of electrical input conductors for connecting an electrical circuit to the electric initiator or squib with each of said input an associated one of said holes in said ferrite bead and having an end positioned in the second end of an connected to the terminal positioned therein.

2. A universal squib connector as defined by claim 1 and further including means connecting said ferrite bead to the pin type electric initiator or squib to permanently retain each of said terminals in electric contact with the individually associated one of the protruding pins of the electric initiator.

3. A universal squib connector as defined by claim 1,

wherein said ferrite bead and said terminals are encapsulated in a plastic molding with the holes in said ferrite bead extending through the plastic molding to allow entry of each of the protruding pins of an electric squib to enter the associated first end thereof and an end of each of said electrical conductors to enter the associated second end thereof.

4. A universal squib connector in combination with a gas generator having an electric initiator or squib of the pin type with protruding pins and operative when electrically energized to provide ignition for said gas generator,

said universal squib connector providing a permanent pig tail connection to said pin type squib and comprising,

connecting terminals,

a ferrite bead having holes therethrough in spaced relation, each of said holes having a first end and a second end, with one of said terminals positioned in one of said holes and another of said terminals positioned in another of said holes, the spacing of said holes being such as to allow each of the protruding pins of said squib to enter the first end of an individually associated one of said holes to make electrical contact with an individually associated one of said terminals, said ferrite bead providing EMI/RFI protection in a region surrounding said terminals, and

a plurality of electrical input conductors for connecting an electrical circuit to said squib with each of said input conductors having an end positioned in the second end of an associated one of said holes in said ferrite bead and connected to the terminal positioned therein,

wherein said ferrite bead and said terminals are encapsulated in a plastic molding with the holes in said ferrite bead extending through the plastic molding to allow entry of each of the protruding pins of said squib to enter the associated first end thereof and an end of each of said electrical conductors to enter the associated second end thereof,

said gas generator having an external wall portion with a socket formed therein into which the protruding pins of said squib extend, with the shape of the plastic molding of said universal squib connector matching that of said socket whereby said universal squib connector is insertable in said socket with each of the terminals in electric contact with an individually associated protruding pin of said squib, and

further including means to permanently retain said universal squib connector in said socket.

5. A universal squib connector as defined in claim 4 wherein the means to permanently retain said universal squib connector in said socket is a crimp formed in the wall portion of the generator.

6. A universal squib connector as defined by claim 4 wherein the plurality of electrical input conductors extend directly away from said universal squib connector.

7. A universal squib connector as defined by claim 4 wherein the shape of said universal squib connector and that of said socket in the external wall portion of the gas generator are both cylindrical, and

wherein the means to permanently retain said universal squib connector in said socket in the external wall portion of said generator comprises a first circumferential groove in the connector, an expansible locking ring in said first circumferential groove, and a second circumferential groove in the wall of the socket with the positions of said first and second circumferential grooves on said connector and socket, respectively, being such that said first and second circumferential grooves are positioned adjacent each other when said universal squib connector is substantially fully inserted in said socket whereby the locking ring is allowed to expand partially out of said first circumferential groove into said second circumferential groove thereby to lock said universal squib connector in said socket.

8. A universal squib connector as defined by claim 7 further including a seal ring provided in circumferential relation to said connector and positioned between said connector and the interior wall of the socket.

9. A universal squib connector as defined by claim 7 wherein the plastic molding for said universal squib connector includes a portion that is adjacent the electrical input conductors, which portion extends at a right angle to said universal squib connector to guide and allow the electrical input conductors to run parallel to the external wall of the generator in which the socket is formed.

10. A universal squib connector as defined by claim 9 wherein an anti-rotation rib is provided on the universal squib connector, which rib extends between said connector and the right angle portion thereof,

wherein the wall of said socket in the external wall portion of the gas generator includes a cutout portion matching the configuration of said anti-rotation rib, and

wherein said anti-rotation rib is so arranged as to fit in the matching cutout portion in the wall of said socket when each of the protruding pins of said squib are in operable electrical contact with an associated one of said terminals.

11. A universal squib connector as defined by claim 9 further including anti-rotation means comprising a cavity adjoining the holes that are provided for the insertion therein of the protruding pins of an electric squib with which the universal squib connector is to be used, which cavity is arranged to receive a projection on the electric squib when the universal squib connector is brought into operative relation with the electric squib, with the contour of the cavity matching that of the projection on the electric squib.

12. A gas generator comprising:

a housing having a wall provided with outer orifices, in which wall a socket is formed, and including,

a pin type squib having electrically conducting pins protruding from a portion thereof,

an inner central chamber in which is placed said squib for ignition, said squib being positioned such that said pins thereof extend into said socket,

an intermediate chamber containing a gas generant pyrotechnic composition,

an outer chamber containing means for filtering and for communicating externally of the housing by way of said outer orifices, with at least said intermediate and outer chambers communicating through intermediate orifices,

a universal squib connector for connecting said squib to a source of electrical current for initiating ignition, said universal squib connector being positioned in said socket and including holes therein into which said pins from said squib are received, said universal squib connector providing a permanent pig tail connection to said squib and comprising,

connecting terminals,

a ferrite bead having said holes therethrough in a spaced relationship, each of said holes having a first end and a second end, with one of said terminals positioned in one of said holes and another of said terminals positioned in another of said holes, the spacing of said holes being such as to allow each of the protruding pins of said squib to enter the first end of an individually associated one of said holes to make electrical contact with an individually associated one of said terminals, said ferrite bead providing EMI/RFI protection in a region surrounding said terminals, and

a plurality of electrical input conductors providing a pig tail connection for connecting an electrical circuit to said squib with each of said input conductors having an end positioned in the second end of an associated one of said holes in said ferrite bead and connected to the terminal positioned therein.

13. A gas generator as defined by claim 12 further including means to permanently retain said universal squib connector in said socket and thereby to permanently retain each of said terminals in electric contact with an individually associated one of the protruding pins of said squib.

14. A gas generator as defined by claim 13 wherein said means to permanently retain said universal squib connector in said socket comprises a crimp in the wall of said housing.

15. A gas generator as defined by claim 13 wherein the shape of said universal squib connector and that of said socket in the wall of the gas generator are both cylindrical, and

wherein the means to permanently retain said universal squib connector in said socket in the wall of said generator comprises a first circumferential groove in said universal squib connector, an expansible locking ring in said first circumferential groove, and a second circumferential groove in the wall of the socket, with the positions of said first and second circumferential grooves, respectively, being such that said first and second circumferential grooves are positioned adjacent each other when said universal squib connector is positioned in operable relation with said squib in said socket whereby said locking ring is allowed to expand partially out of said first circumferential groove into said second circumferential groove thereby to lock said universal squib connector in said socket.

16. A gas generator as defined by claim 15 further including seal means provided between said universal squib connector and the interior wall of said socket.

17. A gas generator as defined by claim 13

wherein said ferrite bead and said terminals are encapsulated in a plastic molding with the holes in said ferrite bead extending through the plastic molding to allow entry of each of the protruding pins of said squib to enter the associated first end thereof and an end of each of said pair of electrical input conductors to enter the associated second end thereof, and

wherein the plastic molding includes a portion adjacent said pair of electrical input conductors that extend at a right angle to said universal squib connector to guide and allow said electrical input conductors to run parallel to the wall of the generator in which the socket is formed.

18. A gas generator as defined by claim 13 further including anti-rotation means provided in cooperative relation with said universal squib connector and said gas generator to predetermine the angular orientation of said universal squib connector with respect to that of said gas generator and to prevent relative angular movement between said universal squib connector and said squib.

19. A gas generator as defined by claim 18 wherein said anti-rotation means comprises a rib provided on said universal squib connector and a cutout in the inner wall of said socket which is arranged to receive said rib when said universal squib connector is positioned in said socket in operable relation with said squib.

20. A gas generator as defined by claim 18 wherein said anti-rotation means comprises a cavity adjoining said holes in said universal squib connector and a projection on said squib with said projection matching the configuration or said cavity and arranged to fit therein when said universal squib connector is positioned in said socket in operable relation with said squib.

21. A gas generator as defined by claim 17 further including anti-rotation means provided in cooperative relation with said universal squib connector and said gas generator to predetermine the angular orientation of said universal squib connector with respect to that of said gas generator and to prevent relative angular movement between said universal squib connector and said squib.

22. A gas generator as defined by claim 21 wherein said anti-rotation means comprises a rib provided on said universal squib connector and a cutout in the inner wall of said socket which is arranged to receive said rib when said universal squib connector is positioned in said socket in operable relation with said squib.

23. A gas generator as defined by claim 21 wherein said anti-rotation means comprises a cavity adjoining said holes in said universal squib connector and a projection on said squib with said projection on said squib matching the configuration or said cavity and arranged to fit therein when said universal squib connector is positioned in said socket in operable relation with said squib.

24. A gas generator as defined by claim 15

wherein said ferrite bead and said terminals are encapsulated in a plastic molding with the holes in said ferrite bead extending through the plastic molding to allow entry of each of the protruding pins of said squib to enter the associated first end thereof and an end of each of said pair of electrical input conductors to enter the associated second end thereof, and

wherein the plastic molding includes a portion adjacent said pair of electrical input conductors that extend at a right angle to said universal squib connector to guide and allow said electrical input conductors to run parallel to the wall of the generator in which the socket is formed.