Airbag tether release mechanism

• US 7,419,184 B2
• Filed: 06/16/2005
• Issued: 09/02/2008
• Est. Priority Date: 06/16/2005
• Status: Active Grant

• Current Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Original Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Inventors: Jordan, Michael P., Green, David J., Parks, Brent A.
• Primary Examiner(s): Hurley; Kevin
• Assistant Examiner(s): Brown; Drew J.
• Application Number:
  US11/154,126
• Publication Number:
  US 20060284404A1
• Time in Patent Office: 1,174 Days
• Field of Search: 280/743.2, 280/739, 280/743.1, 280/736, 280/742, 222/3, 222/5
• US Class Current: 280/743.2
• CPC Class Codes: B60R 2021/161 characterised by additional means for controlling deployment trajectory
• CPC Class Codes: B60R 2021/23386 External tether means
• CPC Class Codes: B60R 21/231 characterised by their shape, construction or spatial configuration
• CPC Class Codes: B60R 21/2338 Tethers
• CPC Class Codes: B60R 21/26 characterised by the inflation fluid source or means to control inflation fluid flow arrangement or mounting thereof to the vehicle B60R21/20; blasting cartridges for producing gas under pressure in general F42B3/04; initiators or igniters therefor F42B3/10

Abstract

Disclosed are embodiments of an airbag tether release mechanism for use with airbag inflation systems. In one embodiment, the mechanism includes an initiator positioned within a housing. The initiator is configured such that it provides an inherent seal to prevent the external release of pyrotechnic residues upon deployment. The device may also include a cutter operatively connected with the initiator such that deployment of the initiator actuates the cutter and a tether restraint structure configured to secure a tether until the tether is released by actuation of the cutter.

Claims

1. An airbag tether release mechanism, comprising:

a housing;

an initiator positioned within the housing, wherein the initiator comprises an output cup having a redrawn end that unrolls and expands during deployment, and wherein the initiator is configured such that it provides an inherent seal to prevent the external release of pyrotechnic residues upon deployment;

a cutter operatively connected with the initiator such that deployment of the initiator actuates the cutter; and

a tether restraint structure configured to secure a tether until the tether is released by actuation of the cutter.

2. The airbag tether release mechanism of claim 1, wherein the tether restraint structure comprises an opening formed within the housing.

3. The airbag tether release mechanism of claim 2, wherein the cutter comprises a piston having an opening formed therein.

4. The airbag tether release mechanism of claim 3, wherein the cutter is configured such that, prior to deployment of the initiator, the opening in the housing is at least partially aligned with the opening in the piston, and wherein, following deployment of the initiator, the opening in the piston is moved out of alignment with the opening in the housing.

5. The airbag tether release mechanism of claim 1, wherein the cutter comprises a cutting blade.

6. The airbag tether release mechanism of claim 1, wherein the tether restraint structure comprises a clip.

7. The airbag tether release mechanism of claim 6, wherein the clip is configured to snap into a recess formed within the housing.

8. The airbag tether release mechanism of claim 6, wherein the cutter is configured to sever at least a portion of the clip upon deployment of the initiator.

9. A method for releasing an airbag tether, comprising:

restraining a tether, wherein the tether is connected to an airbag cushion;

deploying an initiator, wherein the initiator is deployed without externally releasing pyrotechnic residues;

actuating a cutter, wherein the deployment of the initiator actuates the cutter; and

cutting the tether, wherein the actuation of the cutter causes the cutting of the tether.

10. The method of claim 9, wherein the initiator comprises an output cup having a redrawn end that unrolls and expands during deployment.

11. The method of claim 9, wherein the cutter comprises a piston having an opening formed therein.

12. The method of claim 11, wherein, prior to the actuation step, the tether extends through the opening in the piston.

13. The method of claim 12, wherein the actuation of the piston causes the opening in the piston to be at least partially misaligned with another opening.

14. The method of claim 9, wherein the cutter comprises a cutting blade.

15. The method of claim 9, further comprising altering the status of a vent opening in response to the deployment of the initiator.

16. The method of claim 15, wherein altering the status of the vent opening comprises opening the vent opening.

17. The method of claim 15, wherein altering the status of the vent opening comprises closing the vent opening.

18. The method of claim 15, wherein a connecting rod is connected with the cutter, and wherein the connecting rod is used to alter the status of the vent opening.

19. The method of claim 18, wherein a vent door is connected with the connecting rod.

20. An airbag tether release mechanism, comprising:

a housing;

restraining means for restraining an airbag tether;

an initiator positioned within the housing, wherein the initiator comprises an output cup having a redrawn end that unrolls and expands during deployment, and wherein the initiator is configured such that it provides an inherent seal to prevent the external release of pyrotechnic residues upon deployment; and

releasing means for releasing the tether from the restraining means, wherein the releasing means is actuated by the initiator.

21. The airbag tether release mechanism of claim 20, wherein the releasing means comprises a cutter.

22. The airbag tether release mechanism of claim 21, wherein the cutter comprises a cutting blade.

23. The airbag tether release mechanism of claim 21, wherein the cutter is configured to cut through the tether upon deployment of the initiator.

24. The airbag tether release mechanism of claim 21, wherein the cutter is configured to cut through the restraining means upon deployment of the initiator.

25. The airbag tether release mechanism of claim 20, wherein the restraining means comprises an opening in the housing.

26. The airbag tether release mechanism of claim 20, wherein the restraining means comprises a clip.

27. The airbag tether release mechanism of claim 26, wherein the clip is configured to snap into a recess formed within the housing.

28. An airbag tether release mechanism, comprising:

a housing;

an initiator positioned within the housing, wherein the initiator is configured such that it provides an inherent seal to prevent the external release of pyrotechnic residues upon deployment;

a piston comprising a cutter, wherein the piston is operatively connected with the initiator such that deployment of the initiator actuates the piston;

a tether restraint structure configured to secure a tether until the tether is released by actuation of the piston; and

a vent actuator configured to alter the status of a vent opening in response to the deployment of the initiator.

29. The airbag tether release mechanism of claim 28, wherein the vent actuator comprises a connecting rod connected with the piston.

30. The airbag tether release mechanism of claim 29, wherein the vent actuator further comprises a vent door connected with the connecting rod.

31. The airbag tether release mechanism of claim 29, further comprising a pin structure, wherein the pin structure is used to prevent the piston from exiting the housing, and wherein the connecting rod passes by the pin structure and exits the housing.

32. The airbag tether release mechanism of claim 31, wherein the pin structure comprises a split spring pin.

33. The airbag tether release mechanism of claim 28, wherein the vent actuator is configured to alter the status of the vent opening by opening the vent opening.

34. The airbag tether release mechanism of claim 28, wherein the vent actuator is configured to alter the status of the vent opening by closing the vent opening.

35. The airbag tether release mechanism of claim 28, wherein the initiator comprises an output cup having a redrawn end that unrolls and expands during deployment.