Inflator disk actuator backer plate

• US 6,095,556 A
• Filed: 07/20/1998
• Issued: 08/01/2000
• Est. Priority Date: 07/20/1998
• Status: Expired due to Fees

• Current Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Original Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Inventors: Lowe, William Gregory, Bailey, Kirk M.
• Primary Examiner(s): English, Peter C.
• Assistant Examiner(s): Ilan, Ruth
• Application Number:
  US09/120,026
• Time in Patent Office: 743 Days
• Field of Search: 280/737, 280/736, 280/741, 280/742, 102/530, 102/531, 102/204
• US Class Current: 280/737
• 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 inflator for a vehicle inflatable safety system comprising a housing configured to contain a gas generating material, an igniting assembly, and an activating assembly. The igniting assembly includes an actuator plate that is configured to ignite the gas generating material contained in the housing and backer plate. The backer plate is attached to the housing such that a seal is formed therebetween that is capable of substantially stopping the flow of the gas generated by the gas generating material in any direction other than the predetermined directions. The igniting assembly also comprises a booster cup, an ignition charge, and a percussion primer. The booster cup with a conical-shaped end surface with the percussion primer disposed therein proximate to the actuator plate for igniting the gas generating material. The actuator plate and the end surface of the booster cup are in contact only along the peripheral edges thereof. The backer plate and the actuator plate are configured to cooperate such that the backer plate prevents the actuator plate from bulging toward said projectile prior to the actuator plate being engaged. The backer plate is positioned substantially against the actuator plate such that said backer plate is between said actuator plate and said projectile. The backer plate is sized and configured so as to hold the actuator plate substantially flat until the actuator plate is impacted by the projectile to ignite the gas generating material. The activating assembly is connected to the housing and comprises a projectile that is configured to impact the actuator piston of said actuator plate so as to cause the actuator plate to move into impacting engagement with the percussion primers to ignite the ignition charge and thereby the gas generating material.

Claims

1. An inflator for a motor vehicle inflatable safety system comprising:

(a) a housing configured to contain a gas generating material;

(b) an igniting assembly being configured to ignite said gas generating material, said igniting assembly comprising an actuator plate, a backer plate, and a booster cup, said backer plate being positioned substantially against said actuator plate such that said backer plate is between said actuator plate and a projectile, said booster cup having an end surface proximate to said actuator plate, said end surface of said booster cup having a substantially conical-shaped portion, wherein said actuator plate and said end surface of said booster cup are in contact only along the peripheral edges thereof, said igniting assembly being attached to said housing such that a seal is formed therebetween capable of substantially stopping the flow of the gas generated by said gas generating material in any direction other than a plurality of predetermined directions; and

(c) an activating assembly connected to said housing, said activating assembly comprising said projectile configured to impact said igniting assembly to ignite said gas generating material.

2. An inflator as recited in claim 1, wherein said ignition assembly further comprises an ignition charge and a percussion primer disposed in said booster cup for igniting said gas generating material.

3. An inflator as recited in claim 1, wherein said housing has an indented portion formed therein proximate to said backer plate, said indented portion acting as a mechanical stop to keep said backer plate in position against said actuator plate.

4. An inflator for a motor vehicle inflatable safety system comprising:

(a) a housing configured to contain a gas generating material;

(b) an igniting assembly comprising an actuator plate being configured to ignite said gas generating material, said actuator plate comprising;

an actuator piston extending toward an activating assembly;

a deflecting portion extending radially from said actuator piston, said deflecting portion extending laterally across said housing; and

a ridge extending longitudinally in an opposite direction as said actuator piston;

said igniting assembly further including a backer plate, said backer plate being attached to said housing such that a seal is formed therebetween capable of substantially stopping the flow of the gas generated by said gas generating material in an direction other than a plurality of predetermined directions, said backer plate being positioned substantially against said actuator plate so as to prevent said actuator plate from bulging away from said gas generating material, wherein said backer plate has an opening formed therein configured to receive said actuator piston of said actuator plate; and

(c) said activating assembly connected to said housing, said activating assembly comprising a projectile configured to impact said actuator plate to ignite said gas generating material, said backer plate being proximate to said deflecting portion of said actuator plate so as to be positioned between said deflecting portion and said projectile.

5. An inflator as recited in claim 4, wherein said igniting assembly further comprises:

(a) a booster cup having an end surface proximate to said actuator plate, said end surface of said booster cup having a substantially conical-shaped portion, said end surface of said booster cup having a recess formed therein, said recess being substantially aligned with said ridge on said actuator plate, said booster cup having a cavity formed therein proximate to said recess away from said end surface;

(b) a percussion primer disposed in said recess in said end surface of said booster cup; and

(c) an ignition charge contained in said cavity of said booster cup proximate to said percussion primer, said percussion primer being impactedly engaged by said ridge on said actuator plate upon said actuator piston being impacted by said projectile thereby igniting said ignition charge and said gas generating material.

6. An inflator as recited in claim 5, wherein said actuator plate and said end surface of said booster cup defining a cavity therebetween, said end surface of said booster cup and said actuator plate being configured to minimize the volume of said cavity.

7. An inflator as recited in claim 5, wherein said ridge on said of said actuator plate comprises a continuous ring that strikes said percussion primer disposed in said recess formed in said end surface of said booster cup.

8. An inflator as recited in claim 4, wherein said deflecting portion of said actuator plate is flat and is retained flat by said backer plate until actuation.

9. An inflator as recited in claim 4, wherein said housing has an indented portion formed therein proximate to said backer plate, said indented portion being positioned between said backer plate and said projectile and acting as a mechanical stop to keep said backer plate in position against said actuator plate.

10. An inflator as recited in claim 9, wherein said indented portion forms a continuous annular ring around said housing.

11. An ignition assembly for igniting an ignition charge comprising:

(a) at least one percussion primer;

(b) a booster cup having said at least one percussion primer positioned in a recess formed in the end surface thereof, wherein at least a portion of said end surface is conical-shaped, said booster cup having a peripheral edge, said booster cup having a cavity formed proximate to said percussion primer;

(c) an ignition charge disposed in said cavity in said booster cup proximate to said percussion primer;

(d) an actuator plate which has a peripheral edge in engagement with said peripheral edge of said booster cup;

(e) a backer plate for preventing said actuator plate from bulging until said actuator plate is activated, wherein, upon being activated, said actuator plate moves into impacting engagement with said percussion primer to ignite said ignition charge.

12. An ignition assembly as recited in claim 11, wherein said actuator plate is flat and is retained flat by said backer plate.