Airbag tether cutter and vent closer

• US 7,510,212 B2
• Filed: 03/26/2007
• Issued: 03/31/2009
• Est. Priority Date: 03/26/2007
• Status: Expired due to Fees

• Current Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Original Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Inventors: Smith, Bradley W., Parks, Brent, Green, David J.
• Primary Examiner(s): To; Toan C
• Application Number:
  US11/728,815
• Publication Number:
  US 20080238050A1
• Time in Patent Office: 736 Days
• Field of Search: 280/730.1, 280/732, 280/743.1, 280/743.2
• US Class Current: 280/743.2
• CPC Class Codes: B60R 2021/23384 having ends which are movable or detachable during deployment
• CPC Class Codes: B60R 21/2338 Tethers
• CPC Class Codes: B60R 21/276 with means to vent the inflation fluid source, e.g. in case of overpressure B60R21/30 takes precedence; venting means on inflatable member walls B60R21/239

Abstract

Disclosed are embodiments of apparatus, methods, and systems for cutting one or more tethers connected with an airbag cushion and simultaneously, or sequentially, closing one or more vent openings. In one embodiment, an airbag module is provided that includes a tether opening and at least one vent opening. The tether may extend through the tether opening adjacent to a cutter. The cutter may be configured to cut the tether upon deployment of an actuator. A vent door configured to block the vent opening(s) upon deployment of the actuator may also be provided. This embodiment may therefore provided for simultaneous, or sequential, cutting of the tether and closing of the vent opening(s) with a single actuator.

Claims

1. A method for releasing an airbag tether, the method comprising:

positioning a tether through a tether opening, wherein the tether is connected to an airbag cushion;

actuating a cutter to cut the tether and thereby allow for full expansion of the airbag cushion, wherein the cutter comprises an opening in a sliding door, and wherein, prior to actuation of the cutter, the sliding door opening at least partially overlaps with the tether opening; and

closing at least one vent opening in fluid communication with the airbag cushion, wherein the actuation of the cutter causes the at least one vent opening to close.

2. The method of claim 1, wherein the steps of actuating the cutter and closing the at least one vent opening are performed substantially simultaneously.

3. The method of claim 1, wherein the steps of actuating the cutter and closing the at least one vent opening are performed sequentially.

4. The method of claim 1, wherein the cutter comprises a cutting blade.

5. The method of claim 4, wherein the cutting blade is connected with a sliding door having at least one opening corresponding with the at least one vent opening, and wherein, prior to actuation of the cutter, the at least one opening at least partially overlaps with the at least one vent opening, and wherein, following actuation of the cutter, the at least one opening is misaligned with the at least one vent opening so as to block inflation gas from exiting the at least one vent opening.

6. The method of claim 5, wherein the sliding door is connected with the cutting blade via an actuation shaft.

7. The method of claim 4, wherein the tether opening comprises a sharpened edge, and wherein the tether is cut by shearing the cutting blade against the sharpened edge.

8. The method of claim 7, wherein the cutting blade is angled relative to the sharpened edge.

9. The method of claim 1, wherein the sliding door further comprises a second opening, wherein, prior to actuation of the cutter, the second opening at least partially overlaps with the at least one vent opening, and wherein, following actuation of the cutter, the second opening is misaligned with the at least one vent opening so as to block inflation gas from exiting the at least one vent opening.

10. The method of claim 1, wherein the step of closing at least one vent opening in fluid communication with the airbag cushion comprises substantially simultaneously closing a plurality of vent openings in fluid communication with the airbag cushion.

11. An airbag module, comprising:

a housing comprising a tether opening and at least one vent opening;

an airbag cushion, wherein the airbag cushion comprises a tether for restraining the inflation size of the airbag cushion, and wherein the tether extends through the tether opening;

a cutter positioned adjacent to the tether opening and configured to cut the tether upon actuation of an actuator, wherein the cutter comprises a cutting blade, wherein the tether opening comprises a sharpened edge, and wherein the cutter is configured to cut the tether by shearing the cutting blade against the sharpened edge; and

a vent door configured to block the at least one vent opening upon actuation of the actuator.

12. The airbag module of claim 11, wherein the cutter is configured to cut the tether substantially simultaneously with the blocking of the at least one vent opening.

13. The airbag module of claim 11, wherein the cutting blade is angled relative to the tether opening.

14. The airbag module of claim 11, wherein the cutting blade is connected with the vent door, wherein the vent door has at least one opening corresponding with the at least one vent opening, and wherein, prior to actuation of the cutting blade, the at least one opening at least partially overlaps with the at least one vent opening, and wherein, following actuation of the cutter, the at least one opening is misaligned with the at least one vent opening so as to block inflation gas from exiting the at least one vent opening.

15. The airbag module of claim 11, wherein the cutting blade is angled relative to the sharpened edge.

16. The airbag module of claim 11, wherein the vent door comprises a sliding door.

17. The airbag module of claim 16, wherein the cutter comprises an opening in the sliding door, and wherein, prior to actuation of the cutter, the sliding door opening at least partially overlaps with the tether opening.

18. The airbag module of claim 17, wherein the sliding door further comprises a second opening, wherein, prior to actuation of the cutter, the second opening at least partially overlaps with the at least one vent opening, and wherein, following actuation of the cutter, the second opening is misaligned with the at least one vent opening so as to block inflation gas from exiting the at least one vent opening.

19. An airbag module, comprising:

a housing comprising a tether opening and at least one vent opening;

an airbag cushion, wherein the airbag cushion comprises a tether for restraining the inflation size of the airbag cushion, and wherein the tether extends through the tether opening;

means for cutting the tether, wherein the cutting means comprises a cutter opening at least partially aligned with the tether opening, wherein the tether extends through the cutter opening and the tether opening, and wherein the cutting means is positioned adjacent to the tether opening; and

means for selectively blocking the at least one vent opening, wherein the selective blocking means is configured to block the at least one vent opening upon actuation of the cutting means.