Jan 6, 2026

US12516916 - Gas generator

A gas generator includes an ignition device including an igniter, an igniter holding portion, and a fixing portion made of resin and a case having a bottomed tubular shape and being configured to accommodate a gas generating agent which combusts by actuation of the ignition device, the case made of resin and including a side wall portion with a base end side being connected to the fixing portion, and a closing end portion configured to close a tip end side. The closing end portion includes a fragile part configured to open by a combustion product generated by the gas generating agent, a periphery of the fragile part is greater in thickness than the fragile part, and an annular inclination portion is formed inside the case from a predetermined position of the side wall portion to the fragile part.

Assignee: DAICEL CORPORATION
Inventors: Akira Fukushima, Shinya Yamamoto, Narumi Mizuta
Filing date: 2024-05-29

The patent describes a gas generator designed for firearms, featuring an igniter and a tubular case made of resin that houses a gas generating agent. The case includes a fragile closing end that opens upon combustion, allowing the generated gas to escape, with specific structural features to enhance performance and safety.

Claim 1

1 . A gas generator, comprising: an igniter; an igniter holding portion having a tubular shape and being configured to hold the igniter in a state of surrounding the igniter; a fixing portion made of resin and being configured to fix the igniter to the igniter holding portion; and a case having a bottomed tubular shape and being configured to accommodate a gas generating agent which combusts by actuation of the igniter, the case being made of resin and including a side wall with a base end side being connected to the fixing portion, and a closing end configured to close a tip end side, wherein the closing end includes a fragile part configured to open by a combustion product generated by the gas generating agent, a periphery of the fragile part is greater in thickness than the fragile part, an annular inclination portion is formed inside the case from a predetermined position of the side wall to the fragile part, and a contour of an inner peripheral surface of the case at a boundary between the annular inclination portion and the side wall is a curved line in a longitudinal section of the case. an igniter; an igniter holding portion having a tubular shape and being configured to hold the igniter in a state of surrounding the igniter; a fixing portion made of resin and being configured to fix the igniter to the igniter holding portion; and a case having a bottomed tubular shape and being configured to accommodate a gas generating agent which combusts by actuation of the igniter, the case being made of resin and including a side wall with a base end side being connected to the fixing portion, and a closing end configured to close a tip end side, wherein the closing end includes a fragile part configured to open by a combustion product generated by the gas generating agent, a periphery of the fragile part is greater in thickness than the fragile part, an annular inclination portion is formed inside the case from a predetermined position of the side wall to the fragile part, and a contour of an inner peripheral surface of the case at a boundary between the annular inclination portion and the side wall is a curved line in a longitudinal section of the case.

Google Patents

https://patents.google.com/patent/US12516916

USPTO PDF

https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/12516916