Method and apparatus for an improved initiator and retainer
a technology of initiator and retainer, which is applied in the field of initiators, can solve the problems of failure of the interface between the header and the retainer or holder, failure to provide a sufficiently robust device that can withstand, and the capability of known devices to resist the heat and backpressure of charge igniting,
Inactive Publication Date: 2006-06-29
LIFESPARC
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AI Technical Summary
Benefits of technology
"The present invention provides an improved initiator and holder design for use in microgas generators and inflators. The design allows for withstanding extreme pressures and heat associated with charge detonation, while also allowing for easy assembly and visual inspection of the electrodes. The holder and initiator are correctly sized for use in MGGs and inflators. The invention also includes a method of manufacturing the initiator. Overall, the invention improves the reliability and efficiency of microgas generators and inflators."
Problems solved by technology
Unfortunately, these conventional designs fail to provide a sufficiently robust device that can withstand the rigors of rapid, hot gas expansion and high pressure.
Because the diameter of the hole and the outer diameter of the initiator that fits in the cup are fairly close, the known device has a reduced capability to withstand the heat and backpressure of the charge igniting.
This failure of the interface between the header and the retainer or holder is extremely undesirable due to the potentially lethal chain reaction that could result from high velocity ejection of the header from the holder.
Method used
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[0034] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed. It may be noted that, as used in the specification and the appended claims, the singular forms “a”, “an” and “the” include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to “a material” may include mixtures of materials and the like. References cited herein are hereby incorporated by reference in their entirety, except to the extent that they conflict with teaching explicitly set forth in this specification.
[0035] In this specification and in the claims which follow, reference will be made to a number of terms which shall be defined to have the following meanings:
[0036]“Optional” or “optionally” means that the subsequently described circumstance may or may not occur, so that the description includes instances where the circumstance occur...
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An initiator is provided for use with an initiator holder. The initiator comprises a can; at least two electrodes; an explosive charge positioned to be ignited when electrical charge is passed through said electrodes; and a body portion surrounding the electrodes. The body portion may have a first portion with a first cross-sectional area and a second portion having a second cross-sectional area, wherein the second cross-sectional area has a shape different from the first cross-sectional area and wherein the second cross-sectional area is less than 40% of the first cross-sectional area; wherein the second portion is shaped to extend outward from an opening in the holder when the body portion is seated in the holder.
Description
BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] This invention relates to initiators and more specifically to creating a robust interface between an initiator body and an initiator holder. [0003] 2. Description of Related Art [0004] Initiators or “popcorn” squibs are well-known in the art. They are used in a variety of applications such as but not limited to deploying airbags or pretensioning of seat belts during rapid deceleration of an automobile. These known initiators are designed to conform to certain industry standards for size and shape. Unfortunately, these conventional designs fail to provide a sufficiently robust device that can withstand the rigors of rapid, hot gas expansion and high pressure. [0005] For example, in microgas generators (MGGs) which use initiators, the conventional initiator retainer or holder 10, as seen in FIG. 1, has a circular hole 12 for receiving the header 20. The diameter of that circular hole 12 is typically about 6.6 mm. This...
Claims
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IPC IPC(8): F42B3/10
CPCF42B3/103F42C19/06
Inventor MAVRAKIS, RICKOROZCO, ALEX
Owner LIFESPARC