Airbag module mounting bracket with bendable mounting arms

• US 5,700,029 A
• Filed: 10/01/1996
• Issued: 12/23/1997
• Est. Priority Date: 10/01/1996
• Status: Expired due to Fees

• Current Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Original Assignee: Morton International Incorporated (Autoliv Incorporated)
• Inventors: Enders, Mark L.
• Primary Examiner(s): Culbreth, Eric D.
• Application Number:
  US08/724,444
• Time in Patent Office: 448 Days
• Field of Search: 280/731, 280/728.2, 280/728.1, 280/732, 280/777
• US Class Current: 280/728.2
• CPC Class Codes: B60R 21/2037 the module or a major component thereof being yieldably mounted, e.g. for actuating the horn switch or for protecting the driver in a non-deployment situation horn switches integrated in steering wheel covers with tear lines B60R21/21658

Abstract

An airbag module mounting bracket for mounting an airbag module within a steering wheel assembly in a vehicle. The mounting bracket includes a main body plate securable to the airbag module and defining a generally circular inflator-receiving aperture for fitting around a cylindrical airbag inflator of the airbag module, with the inflator-receiving aperture having a center point. The mounting bracket is attachable to the steering wheel at only two spaced-apart, opposing attachment points, with the attachment points positioned so that an imaginary straight line intersecting both attachment points is radially offset from the center point of the inflator-receiving aperture of the main body plate. A portion of the mounting bracket between the imaginary straight line and the center point of the inflator-receiving aperture is rigid yet bendable under torque caused by inflation of an airbag cushion in the airbag module, whereby the mounting bracket bends to allow the airbag module to rotate in order to place the inflated airbag cushion in an optimum position with respect to a vehicle driver.

Claims

1. An airbag module mounting bracket for mounting an airbag module within a steering wheel assembly in a vehicle, the airbag module having an inflatable airbag cushion and a cylindrical airbag inflator extending out of a bottom surface of the airbag module, the airbag module mounting bracket comprising:

a main body plate securable to the bottom surface of the airbag module and defining a generally circular inflator-receiving aperture for fitting around the cylindrical airbag inflator of the airbag module, the generally circular inflator-receiving aperture having a center point; and

the mounting bracket attachable to the steering wheel assembly at only two spaced-apart, opposing attachment points, with the attachment points positioned so that an imaginary straight line intersecting both attachment points is radially offset from the center point of the inflator-receiving aperture of the main body plate, a portion of the mounting bracket between the imaginary straight line and the center point of the inflator-receiving aperture being rigid yet bendable under torque caused by inflation of the airbag cushion in the airbag module.

2. An airbag module mounting bracket according to claim 1 wherein the mounting bracket is shaped so that the imaginary straight line is also axially offset from the center point of the inflator-receiving aperture.

3. An airbag module mounting bracket according to claim 1 further comprising a first bendable mounting arm and a generally opposing, second bendable mounting arm extending from an outer edge of the main body plate away from the inflator-receiving aperture, with one of the two attachment points of the mounting bracket positioned on the first attachment arm and the other of the two attachment points positioned on the second mounting arm, the first and the second attachment arms forming said portion of the mounting bracket being rigid yet bendable under torque caused by inflation of an airbag in the airbag module.

4. An airbag module mounting bracket according to claim 3 wherein the imaginary straight line is also axially offset from the center point of the inflator-receiving aperture.

5. An airbag module mounting bracket according to claim 4 wherein:

the first mounting arm includes a first segment extending from the outer edge of the main body plate, generally perpendicular to the main body plate, and a second segment extending from the first segment outwardly from the inflator-receiving aperture and offset from and generally parallel with the main body plate, with the attachment point of the first mounting arm located on the second segment; and

the second mounting arm includes a first segment extending from the outer edge of the main body plate, generally perpendicular to the main body plate, and a second segment extending from said first segment outwardly from the inflator-receiving aperture and offset from and generally parallel with the main body plate, with the attachment point of the second mounting arm located on said second segment.

6. An airbag module mounting bracket according to claim 5 wherein the first segment of each of the first and the second mounting arms includes at least one elongated strengthening rib.

7. An airbag module mounting bracket according to claim 3 wherein:

the outer edge of the main body plate includes a top edge; and

the first and the second mounting arms are positioned so that the imaginary straight line is positioned below the center point of the inflator-receiving aperture of the main body plate.

8. An airbag module mounting bracket according to claim 7 wherein:

the outer edge of the main body plate also includes a first side edge and a second side edge;

the first mounting arm extends from the first side edge, downwardly away from the top edge of the main body plate and radially outwardly from the inflator-receiving aperture; and

the second mounting arm extends from the second side edge, downwardly away from the top edge of the main body plate and radially outwardly from the inflator-receiving aperture.

9. An airbag module mounting bracket according to claim 3 wherein each attachment point of the first and the second mounting arms comprise a center point of a mounting fastener hole.

10. An airbag module mounting bracket according to claim 3 wherein each of the first and the second mounting arms includes at least one elongated strengthening rib.

11. An airbag module mounting bracket according to claim 1 wherein the main body plate defines a plurality of spaced-apart assembly fastener holes surrounding the inflator-receiving aperture for securing the mounting bracket to the bottom surface of the airbag module.

12. An airbag module mounting bracket according to claim 1 wherein a cover clamp, for clamping a module cover of the airbag module, extends from the main body plate generally perpendicular to the main body plate.

13. An airbag module mounting bracket according to claim 1 wherein the main body plate defines a substantially continuous shallow depression encircling the inflator-receiving aperture between the two attachment points.

14. An airbag module for mounting in a steering wheel assembly of a vehicle, the airbag module comprising:

A) a module baseplate;

B) a module cover secured to the module baseplate;

C) an inflatable, folded airbag cushion secured to the module baseplate and contained between the module baseplate and the module cover;

D) a cylindrical airbag inflator secured to the module baseplate and positioned within an opening in the module baseplate with a portion of the airbag inflator defining a plurality of gas exhaust ports positioned within the airbag cushion; and

E) a mounting bracket including,

a main body plate secured to the module baseplate and defining a generally circular inflator-receiving aperture fitting around the cylindrical airbag inflator, the generally circular inflator-receiving aperture having a center point, and

the mounting bracket attachable to the steering wheel assembly at only two spaced-apart, opposing attachment points, with the attachment points positioned so that an imaginary straight line intersecting both attachment points is radially offset from the center point of the inflator-receiving aperture of the main body plate, a portion of the mounting bracket between the imaginary straight line and the center point of the inflator-receiving aperture being rigid yet bendable under torque caused by inflation of the airbag cushion.

15. An airbag module according to claim 14 wherein the mounting bracket is shaped so that the imaginary straight line is also axially offset from the center point of the inflator-receiving aperture.

16. An airbag module according to claim 14 wherein the mounting bracket further includes a first bendable mounting arm and a generally opposing, second bendable mounting arm extending from an outer edge of the main body plate away from the inflator-receiving aperture, with one of the two attachment points of the mounting bracket positioned on the first attachment arm and the other of the two attachment points positioned on the second mounting arm, the first and the second attachment arms forming said portion of the mounting bracket being rigid yet bendable under torque caused by inflation of an airbag in the airbag module.

17. An airbag module according to claim 16 wherein the imaginary straight line of the mounting bracket is also axially offset from the center point of the inflator-receiving aperture.

18. An airbag module according to claim 17 wherein:

the first mounting arm of the mounting bracket includes a first segment extending from the outer edge of the main body plate, generally perpendicular to the main body plate, and a second segment extending from the first segment outwardly from the inflator-receiving aperture and offset from and generally parallel with the main body plate, with the attachment point of the first mounting arm located on the second segment; and

the second mounting arm of the mounting bracket includes a first segment extending from the outer edge of the main body plate, generally perpendicular to the main body plate, and a second segment extending from said first segment outwardly from the inflator-receiving aperture and offset from and generally parallel with the main body plate, with the attachment point of the second mounting arm located on said second segment.

19. An airbag module according to claim 14 wherein:

the outer edge of the main body plate of the mounting bracket includes a top edge; and

the first and the second mounting arms of the mounting bracket are positioned so that the imaginary straight line is positioned below the center point of the inflator-receiving aperture of the main body plate.

20. An airbag module according to claim 19 wherein:

the outer edge of the main body plate of the mounting bracket also includes a first side edge and a second side edge;

the first mounting arm of the mounting bracket extends from the first side edge, downwardly away from the top edge of the main body plate and radially outwardly from the inflator-receiving aperture; and

the second mounting arm of the mounting bracket extends from the second side edge, downwardly away from the top edge of the main body plate and radially outwardly from the inflator-receiving aperture.