Tubular dual stage inflator
First Claim
1. An inflator comprising:
- a housing having a bulkhead dividing the housing into a first combustion chamber and a second combustion chamber, wherein the housing has a first plurality of exit ports arranged around a circumference of the housing for providing a first pathway for inflation gas to exit the inflator from the first combustion chamber and a second plurality of exit ports arranged around the circumference of the housing for providing a second pathway for inflation gas to exit the inflator from the second combustion chamber;
a first endcap having an opening for receiving a first igniter assembly, wherein the first endcap is fastened to a first end of the housing, and a second endcap having a center opening for receiving a second igniter assembly, wherein the second endcap is fastened to a second end of the housing;
a first filter having essentially a circular shape disposed in the first combustion chamber adjacent to the bulkhead such that the first filter is interposed between said first plurality of exit ports and a gas generant disposed in the first combustion chamber, the first filter having a width that is less than half of a length of the housing for the first combustion chamber;
a second filter having essentially a circular shape disposed in the first combustion chamber adjacent to the bulkhead such that the second filter is interposed between said second plurality of exit ports and a gas generant disposed in the first combustion chamber, the second filter having a width that is less than half of a lenath of the housing for the second combustion chamber; and
wherein each igniter assembly comprises an igniter core having electrodes for carrying an electrical signal to a bridge wire, wherein the passage of current along the bridge wire creates sufficient heat to ignite an ignition material, a plastic overmold partially surrounding the igniter core having threads for attachment to the inflator in a manner to prevent moisture incursion, wherein the plastic overmold has a retainer portion defining a cavity for receiving an enhancer tablet, and the enhancer tablet adiacent to the ignition material and to the gas generant, wherein ignition of the ignition material lights the enhancer tablet, which in turn lights the gas generant.
12 Assignments
0 Petitions
Accused Products
Abstract
A tubular inflator has a bulkhead that divides the inflator into a first and second combustion chambers. Each combustion chamber has an igniter assembly, gas generant, and compressed wire filter. The wire filters in the inflator are positioned so that they contact the bulkhead. The filters and the bulkhead prevent sympathetic ignition in the inflator, which is defined as the ignition of gas generant in one combustion chamber from the heat generated from the burning of the gas generant in the other combustion chamber. The igniter assembly has an igniter core that is molded by a unitary plastic material. The plastic overmold has threads for attaching the igniter assembly to the inflator, and the plastic overmold has a retainer portion for retaining an enhancer tablet.
31 Citations
9 Claims
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1. An inflator comprising:
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a housing having a bulkhead dividing the housing into a first combustion chamber and a second combustion chamber, wherein the housing has a first plurality of exit ports arranged around a circumference of the housing for providing a first pathway for inflation gas to exit the inflator from the first combustion chamber and a second plurality of exit ports arranged around the circumference of the housing for providing a second pathway for inflation gas to exit the inflator from the second combustion chamber;
a first endcap having an opening for receiving a first igniter assembly, wherein the first endcap is fastened to a first end of the housing, and a second endcap having a center opening for receiving a second igniter assembly, wherein the second endcap is fastened to a second end of the housing;
a first filter having essentially a circular shape disposed in the first combustion chamber adjacent to the bulkhead such that the first filter is interposed between said first plurality of exit ports and a gas generant disposed in the first combustion chamber, the first filter having a width that is less than half of a length of the housing for the first combustion chamber;
a second filter having essentially a circular shape disposed in the first combustion chamber adjacent to the bulkhead such that the second filter is interposed between said second plurality of exit ports and a gas generant disposed in the first combustion chamber, the second filter having a width that is less than half of a lenath of the housing for the second combustion chamber; and
wherein each igniter assembly comprises an igniter core having electrodes for carrying an electrical signal to a bridge wire, wherein the passage of current along the bridge wire creates sufficient heat to ignite an ignition material, a plastic overmold partially surrounding the igniter core having threads for attachment to the inflator in a manner to prevent moisture incursion, wherein the plastic overmold has a retainer portion defining a cavity for receiving an enhancer tablet, and the enhancer tablet adiacent to the ignition material and to the gas generant, wherein ignition of the ignition material lights the enhancer tablet, which in turn lights the gas generant. - View Dependent Claims (2, 3, 4, 5)
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6. An inflator comprising:
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a gas generant for producing inflation gas to inflate an airbag; and
an igniter assembly comprising;
an igniter core having electrodes for carrying an electrical signal to a bridge wire, wherein the passage of current along the bridge wire creates sufficient heat to ignite an ignition material, a plastic overmold for partially surrounding the igniter core having threads for attachment to the inflator in a manner to prevent moisture incursion, wherein the plastic overmold has a retainer portion defining a cavity for receiving an enhancer tablet, and the enhancer tablet adjacent to the ignition material and to the gas generant, wherein ignition of the ignition material lights the enhancer tablet, which in turn lights the gas generant. - View Dependent Claims (7, 8, 9)
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Specification