Air bag inflator mounting

• US 5,685,558 A
• Filed: 02/06/1996
• Issued: 11/11/1997
• Est. Priority Date: 02/06/1996
• Status: Expired due to Fees

• Current Assignee: TRW Inc. (Northrop Grumman Corporation)
• Original Assignee: TRW Inc. (Northrop Grumman Corporation)
• Inventors: Cuevas, Jess A.
• Primary Examiner(s): Dickson, Paul N.
• Application Number:
  US08/597,280
• Time in Patent Office: 644 Days
• Field of Search: 280/728.2, 280/731, 280/732, 280/741, 280/737
• US Class Current: 280/728.2
• CPC Class Codes: B60R 2021/2633 with a plurality of inflation levels
• CPC Class Codes: B60R 21/203 in steering wheels or steering columns
• CPC Class Codes: B60R 21/2171 specially adapted for elongated cylindrical or bottle-like inflators with a symmetry axis perpendicular to the main direction of bag deployment, e.g. extruded reaction canisters B60R21/2176 takes precedence
• CPC Class Codes: B60R 21/272 with means for increasing the pressure of the gas just before or during liberation, e.g. hybrid inflators

Abstract

An apparatus for helping to protect an occupant of a vehicle comprises a plate (40) which is attachable to a vehicle steering wheel (22). A post (106) is fixed to the plate (40) and extends from the plate. The post (106) has an opening (108). An inflatable vehicle occupant protection device (42) is attached to the plate (40). The protection device (42), upon inflation, helps protect the occupant of the vehicle from forcefully striking a part of the vehicle. An actuatable inflator (44) is attached to the plate (40) and provides, upon actuation, inflation fluid to inflate the protection device (42). The inflator (44) includes a base (142) having a surface (260) defining a slot (262) for receiving the post (106). The base (142) of the inflator (44) further includes a surface defining a passage (264) communicating with the slot (262) in the base. A pin (280) extends through the passage (264) in the base (142) of the inflator (44) and into the opening (108) in the post (106) to inhibit movement of the inflator (44) relative to the plate (40).

Claims

1. An apparatus for use in a vehicle, said apparatus comprising:

a plate having a first post fixed to said plate and extending from said plate, said first post including an opening;

an inflatable vehicle occupant protection device attachable to said plate, said protection device, upon inflation, helping protect an occupant of the vehicle from forcefully striking a part of the vehicle;

an actuatable inflator which provides, upon actuation, inflation fluid to inflate said protection device, said inflator including a base with surface means for defining a first slot receiving said first post, said base of said inflator further including means for defining a passage communicating with said first slot in said base; and

a pin extending through the passage in said base of said inflator and into the opening in said first post of said plate to inhibit movement of said inflator relative to said plate.

2. The apparatus of claim 1 wherein said surface means of said base further defines a second slot in said base, said first and second slots being spaced apart and extending parallel to each other in a direction transverse to a longitudinal central axis of said inflator, said plate further including a second post extending parallel to said first post and being received in said second slot in said base of said inflator.

3. The apparatus of claim 1 wherein the passage in said base extends into said base from opposite sides of said first slot and said pin extends through the opening in said first post and into said base on opposite sides of said first slot.

4. The apparatus of claim 1 wherein the apparatus has a steering shaft and said first post extends transversely from said plate and in a direction substantially parallel to the steering shaft.

5. The apparatus of claim 1 wherein said inflator comprises an elongate container supported with a longitudinal central axis of said container extending in a direction transverse to the direction said first post extends from said plate.

6. The apparatus of claim 1 wherein the vehicle has a steering wheel and a steering shaft and further including an annular protective ring attached to said plate, said protective ring extending from said plate and encircling said protection device to protect said protection device from damage during attachment of said plate to one of the steering wheel and steering shaft.

7. An apparatus for protecting an operator of a vehicle having a steering wheel connected to a steering shaft, said apparatus comprising:

an inflatable vehicle occupant protection device which when inflated is positionable between the steering wheel and the operator of the vehicle;

an actuatable inflator which provides inflation fluid to inflate said protection device, said inflator including a base having a surface defining a slot and a surface defining a passage in said base of said inflator, the passage communicating with the slot; and

means for attaching said base of said inflator to the steering wheel, said attaching means comprising;

a mounting plate connectable with a vehicle steering wheel, said protection device being attachable to said mounting plate;

a post fixed to said mounting plate and located in the slot in said base of said inflator, said post having an opening; and

a pin extendable through the passage in said base of said inflator and into the opening in said post to inhibit movement of said inflator relative to said post.

8. The apparatus of claim 7 wherein the passage extends into said base from opposite sides of the slot in said base and said pin extends through said post and into said base on opposite sides of said slot.

9. The apparatus of claim 7 wherein said post extends in a direction substantially parallel to the steering shaft when attached to the steering wheel.

10. An apparatus for inflating a vehicle occupant protection device mounted on a vehicle steering wheel attached to a vehicle steering shaft, said apparatus comprising:

a plate connectable with the steering wheel;

a pair of parallel posts extending from said plate, at least one of said posts including an opening;

an actuatable dual stage inflator including a container having an elongate cylindrical shape and a base, said container defining a chamber for holding an inflation fluid, said container having an opening through which inflation fluid can flow to inflate the vehicle occupant protection device;

a rupturable first closure blocking fluid flow through the opening in said container and rupturing when pressure of the inflation fluid in the chamber increases to a predetermined pressure;

said base defining a pair of combustion chambers, ignitable material and a respective one of a pair of igniters being located in each combustion chamber, said base having flow openings, at least one flow opening communicating a respective combustion chamber with the inflation fluid chamber;

second and third closures blocking the flow openings in said base;

said base of said inflator including a pair of slots for receiving said pair of posts of said plate to attach said inflator to said plate and inhibit movement of said inflator relative to said plate in a direction normal to said posts, said base of said inflator further including surface means defining a passage which extends into one of the slots;

a pin extendable through the passage in said base of said inflator and into the opening in said at least one post of said plate to inhibit movement of said inflator relative to said plate in a direction parallel to said posts;

a first one of said igniters being actuated to ignite said ignitable material in a first one of said combustion chambers to rupture said second closure which blocks the flow opening communicating with the first combustion chamber to allow combustion products from ignition of said ignitable material to flow into the inflation fluid holding chamber and heat the inflation fluid to increase the pressure in the inflation fluid holding chamber to the predetermined pressure and rupture said first closure to permit fluid flow through the opening in said container; and

a second one of said igniters being actuated to ignite said ignitable material in a second one of said combustion chambers to rupture said third closure blocks the flow opening communicating with the second combustion chamber to allow combustion products from ignition of said ignitable material to flow into the inflation fluid holding chamber to further heat the inflation fluid.