Sealing unit for pressurized gas generator of automotive safety device

Claim 1

A rupturable sealing unit for use with a supply of pressurized fluid which inflates an inflatable bag when said sealing unit is ruptured, said sealing unit comprising in combination: an outlet port of a pressurized gas generator, said outlet part having a neck portion having a spherical segment formed in the leading end thereof; a rupturable rigid blocking member having a dome shaped configuration having an inner surface and an outer surface thereby enabling said blocking member to bear greater force on said outer surface than on said inner surface; means disposed at said inner surface of said blocking member for rupturing same at a selected time including an impactresponsive explosive charge mounted on said inner surface of said blocking member; means for mounting said blocking member to expose said outer surface thereof to pressurized fluid during use of the sealing unit including a cap member threadably engaged with said leading end of said neck portion mounting said blocking member in closing engagement with said spherical segment, said cap member having a bottom wall having means therein defining a bore which is aligned with said pressurized gas discharge outlet port, said bore communicating with an inflatable confinement, whereby when said blocking member is ruptured by energy caused by explosion of said impact-responsive explosive charge during a collision of a motor vehicle, a pressurized gas in said pressurized gas generator is admitted to said inflatable confinement to actuate the same to its inflated position; explosion energy transmitting means which is charged at said inner surface of said blocking member around said explosive charge; and a hollow retainer for retaining said explosion energy transmitting means at said inner surface of said blocking member, said hollow retainer having an outer periphery releasably fitted in said bore of said cap member.