Gas generator with improved supported burst cup

Patent metadata

Field	Value
Publication number	US-9738245-B1
Application number	US-201615068460-A
Country	US
Kind code	B1
Filing date	Mar 11, 2016
Priority date	Mar 11, 2015
Publication date	Aug 22, 2017
Grant date	Aug 22, 2017

Abstract

A pressurized gas mechanism contains a sealed gas container containing a sealed first end, and, a burst cup sealing the first end and containing a rupturable portion. A housing encases the burst cup and is juxtaposed to at least a portion of the sealed gas container, the housing containing a surface juxtaposed to the rupturable portion. Upon actuation of the mechanism, the rupturable portion is adapted to rupture as the rupturable portion is leveraged against the surface, thereby releasing gas from the sealed gas container.

First claim

What is claimed is:

1. A gas generator comprising:
a sealed gas container comprising a first opening;
a housing having a first end, the housing being circumferentially fixed about said first opening of the sealed gas container proximate to the first end of said housing, said housing defining an inner chamber and at least one gas exit orifice at a second end of said housing, said housing defining a lever portion of an inner wall;
a burst cup having an outer wall and being fixed across said first opening of the sealed gas container such that said burst cup seals and fluidly communicates with said sealed gas container, the burst cup extending into said inner chamber;
a portion of the outer wall of the burst cup defining a rupturable portion, said rupturable portion being disposed radially inward and in contact with said lever portion; and
an igniter that when actuated provides forces against said outer wall of said burst cup thereby biasing said rupturable portion away from said lever portion to break the rupturable portion, which unseals the sealed gas container and releases gas into said inner chamber.

2. The gas generator of claim 1 wherein said lever portion comprises an aft portion of said inner wall.

3. The gas generator of claim 1 wherein said lever portion comprises a corner portion of said housing, said corner portion including said inner wall.

4. The gas generator of claim 1 wherein said lever portion comprises an aft portion of said inner wall and a corner portion of said housing.

5. The gas generator of claim 1 wherein a flared portion of said burst cup extends radially inward from the rupturable portion.

6. A pressurized gas mechanism comprising:
a sealed gas container containing a sealed first end;
a burst cup sealing said first end and containing a rupturable portion; and
a housing encasing said burst cup and juxtaposed to at least a portion of said sealed gas container, said housing containing a surface in contact with said rupturable portion,
wherein said rupturable portion is adapted to rupture as the rupturable portion is leveraged away from said surface, thereby releasing gas from said sealed gas container.

7. The pressurized gas mechanism of claim 6 wherein said surface is an inner wall of said housing.

8. The pressurized gas mechanism of claim 6 wherein said surface contains a cornered portion of said housing.

9. The pressurized gas mechanism of claim 6 wherein said surface contains an inner wall of said housing.

10. A pressurized gas mechanism containing:
a vessel containing pressurized gas;
a housing fixed to or adjacent to the vessel, the housing containing a bore portion defined by an inner wall, an interior, and a first end and a second end;
a burst cup sealably fixed at the first end in fluid communication with the pressurized gas and retaining the pressurized gas, the burst cup including:
(a) a flange portion radially outwardly extending adjacent to the bore portion;
(b) a stress riser web axially extending from the flange portion, the stress riser web radially supported by the bore portion;
(c) a flared portion extending radially inward from the stress riser web, a radially outward-most portion of the flared portion radially supported by the bore portion;
(d) a closed reduced-diameter portion forming an interior of the burst cup; and

an igniter positioned within the housing to enable fluid communication with an interior of the housing, to release ignition products against the reduced-diameter portion.

11. The pressurized gas mechanism of claim 10 further comprising:
a plenum defined between the inner wall and reduced-diameter portion, wherein upon activation of the pressurized gas mechanism, the flared portion is biased against the inner wall as the igniter products impinge against the reduced-diameter portion, thereby fracturing the stress riser web; and
a perforated diffuser in fluid communication with the housing interior.

Assignees

• Stevens Bruce A
• Tk Holdings Inc

Inventors

• Stevens Bruce A

Classifications

• B60R21/264 Primary

  using instantaneous generation of gas, e.g. pyrotechnic (B60R21/268 takes precedence) · CPC title

• B60R2021/26029

  Ignitors · CPC title

• B60R21/261

  with means other than bag structure to diffuse or guide inflation fluid · CPC title

• B60R21/274 Primary

  characterised by means to rupture or open the fluid source · CPC title