Distributed charge inflator system

• US 7,162,958 B2
• Filed: 08/21/2002
• Issued: 01/16/2007
• Est. Priority Date: 05/17/2002
• Status: Expired due to Fees

• Current Assignee: Zodiac Automotive US, Inc. (Safran SA)
• Original Assignee: Zodiac Automotive US, Inc. (Safran SA)
• Inventors: Fitzgerald, Kevin, Shilliday, David, Scaven, Gregory J.
• Primary Examiner(s): Poon; Peter M.
• Assistant Examiner(s): Parsley; David J.
• Application Number:
  US10/224,435
• Publication Number:
  US 20030213398A1
• Time in Patent Office: 1,609 Days
• Field of Search: 102/530, 102/531, 280/736, 280/740, 280/741, 280/742, 280/737
• US Class Current: 102/530
• CPC Class Codes: B60R 2021/0018 Roll-over
• CPC Class Codes: B60R 2021/2648 comprising a plurality of combustion chambers or sub-chambers
• CPC Class Codes: B60R 21/23138 specially adapted for side protection B60R21/23184, B60R21/232 take precedence
• CPC Class Codes: B60R 21/232 Curtain-type airbags deploying mainly in a vertical direction from their top edge
• CPC Class Codes: B60R 21/2644 using only solid reacting substances, e.g. pellets, powder
• CPC Class Codes: B60R 21/2646 the reacting substances being supported by the inflatable member walls, or by a flexible support within it
• CPC Class Codes: B60R 21/272 with means for increasing the pressure of the gas just before or during liberation, e.g. hybrid inflators
• CPC Class Codes: C06D 5/06 by reaction of two or more solids

Abstract

An inflator includes a distributed charge to be distributed within an inflatable component of an inflatable system and a housing. The housing includes a combustion chamber and a gas storage chamber. The combustion chamber includes an initiator and a gas propellant. The gas storage chamber includes an inert gas at a high pressure. The housing also includes a gas nozzle. The distributed charge is connected to the housing through the gas nozzle. The distributed charge may be mechanically joined to the housing by a ferrule. Upon receiving an electrical signal from a crash sensor or other activator, the initiator ignites the gas propellant in the combustion chamber. The hot gas and hot particles from the burning gas propellant and the initiator flow into the gas storage chamber and heat the compressed inert gas in the gas storage chamber. The heated, compressed gas in the gas storage chamber flows through the gas nozzle and ignites the distributed charge. Combustion of the distributed charge generates a high volume of gas and inflates an inflatable component of an inflatable system.

Claims

1. An inflatable system comprising:

a. an inflatable component; and

b. means for inflating and sustaining inflation of the inflatable component, such means comprising;

i. a non-inflatable housing distinct from but in fluid communication with the inflatable component, the housing comprising;

A. a combustion chamber;

B. a gas storage chamber in fluid communication with the combustion chamber; and

C. a gas nozzle actuatable prior to inflation of the inflatable component;

ii. an initiator disposed in the combustion chamber;

iii. a gas propellant disposed in the combustion chamber;

iv. a charge distributed within the inflatable component such that a substantial portion of the charge is disposed outside the housing, the charge generating inflating gas so as to provide initial inflation of the inflatable component; and

v. a compressed gas, disposed in the gas storage chamber in fluid communication with the gas nozzle, for sustaining inflation of the inflatable component after its initial inflation.

2. The system of claim 1, wherein the charge is connected to the combustion chamber.

3. The system of claim 1, wherein the charge is connected to the gas storage chamber.

4. The system of claim 1, wherein the charge is connected to the initiator.

5. The system of claim 1, wherein the initiator ignites the gas propellant and the charge.

6. The system of claim 1, wherein the initiator ignites the gas propellant in the combustion chamber and the ignited gas propellant heats the compressed gas in the gas storage chamber.

7. The system of claim 6, wherein the heated compressed gas ignites the charge.

8. The system of claim 1, wherein the inflating and sustaining means further comprises a sheath enclosing the charge.

9. The system of claim 1, wherein the charge is made of a rod of one or more pyrotechnic materials.

10. The system of claim 1, wherein the inflating and sustaining means further comprises at least one additional charge distributed within the inflatable component.

11. The system of claim 10, wherein the at least one additional charge is connected to the combustion chamber.

12. The system of claim 10, wherein the at least one additional charge is connected to the gas storage chamber.

13. The system of claim 10, wherein the inflatable component comprises a plurality of inflatable chambers.

14. The system of claim 13, wherein the charge is distributed within one of the plurality of inflatable chambers and the at least one additional charge is distributed in another of the plurality of inflatable chambers.

15. The system of claim 1, wherein the inflating and sustaining means further comprises a ferrule mechanically joining the charge to the housing.

16. The system of claim 1, wherein the compressed gas is inert.

17. The system of claim 1, wherein the charge is distributed within the inflatable component prior to inflation of the inflatable component such that a substantial portion of the charge is disposed outside the housing prior to inflation of the inflatable component.

18. An inflatable system comprising:

a. an inflatable component including a plurality of inflatable chambers; and

b. means for generating inflating gas, such means comprising;

i. a non-inflatable housing distinct from but in fluid communication with the inflatable component and including (A) an initiator and (B) a gas nozzle actuatable prior to inflation of the inflatable component; and

ii. a plurality of charges (A) connected to the housing and (B) for generating inflating gas, each of the plurality of charges extending into and being distributed in a respective and different one of the plurality of inflatable chambers; and

wherein (a) the housing comprises a first chamber including the initiator and a second chamber and (b) the gas generating means further comprises a compressed gas included in the second chamber in fluid communication with the gas nozzle.

19. The system of claim 18, wherein the plurality of charges are connected to the first chamber.

20. The system of claim 18, wherein the plurality of charges are connected to the second chamber.

21. The system of claim 18, wherein the plurality of charges are connected to the initiator.

22. The system of claim 18, wherein each of the plurality of charges extends into and is distributed in a respective and different one of the plurality of inflatable chambers prior to inflation thereof.

23. The system of claim 18, wherein the gas nozzle is in fluid communication with the plurality of charges.

24. An inflatable system comprising:

a. an inflatable component; and

b. means for inflating and sustaining inflation of the inflatable component, such means comprising;

i. a non-inflatable housing distinct from but in fluid communication with the inflatable component, the housing comprising;

A. a combustion chamber;

B. a gas storage chamber in fluid communication with the combustion chamber; and

C. a gas nozzle actuatable prior to inflation of the inflatable component;

ii. an initiator disposed in the combustion chamber;

iii. a gas propellant disposed in the combustion chamber;

iv. a charge, in the form of a rod of one or more pyrotechnic materials, distributed within the inflatable component such that a substantial portion of the charge is disposed outside the housing, the charge generating inflating gas so as to provide initial inflation of the inflatable component;

v. a sheath enclosing the charge;

vi. a ferrule mechanically joining the charge to the housing; and

vii. an inert compressed gas, disposed in the gas storage chamber in fluid communication with the gas nozzle, for sustaining inflation of the inflatable component after its initial inflation; and

in which the initiator ignites the gas propellant in the combustion chamber, the ignited gas propellant heats the compressed gas in the gas storage chamber, and the heated compressed gas flows through the gas nozzle and ignites the charge.

25. An inflatable system comprising:

a. an inflatable component including a plurality of inflatable chambers; and

b. means for generating inflating gas, such means comprising;

i. a non-inflatable housing distinct from but in fluid communication with the inflatable component and including (A) an initiator and (B) a gas nozzle actuatable prior to inflation of the inflatable component; and

ii. a plurality of charges (A) connected to the housing, (B) in fluid communication with the gas nozzle, and (C) for generating inflating gas, each of the plurality of charges extending into and being distributed in a respective and different one of the plurality of inflatable chambers prior to inflation thereof; and

wherein (a) the housing comprises a first chamber including the initiator and a second chamber and (b) the gas generating means further comprises a compressed gas included in the second chamber in fluid communication with the gas nozzle.