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Vibration and Earthquake Isolation

Passenger-automotive-restraint-generator

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Passenger automotive restraint generator

Details

Inventors: Cunningham, Donald J.;
Assignee: Morton International, Inc. (Chicago, IL)
Primary Examiner: Warden; Robert J.
Assistant Examiner: Singla; A.
Attorney, Agent or Firm: White; Gerald K.

An impact extruded perforated aluminum housing contains a two-stage gas generator having a perforated bulkhead positioned between the stages. Each stage includes a combustion chamber having an igniter and pyrotechnic charge therein with cooling and filter screens surrounding the combustion chamber. The igniter of the first stage is fired by a squib responsively to an external electrical signal. A rupturable barrier and a ball valve associated with the bulkhead control the flow of gas through the bulkhead and provide mechanical timing for ignition delay in the firing of the second stage after the first stage has been fired, and also provide pressure control after ignition of both stages to prevent repressurizing the first stage. A rupturable foil barrier surrounding the combustion chamber in the first stage promotes a rapid rise in pressure therein and thus breakout sooner therefrom of gas to an airbag to be inflated. A rupturable foil barrier surrounds the cooling and filter screens in the second stage and delays the breakout of gas therefrom to the airbag as the pressure rises, the rate of which pressure rise is less than that at which the pressure in the first stage rises. The thickness of the foil barrier surrounding the combustion and filter screens is selected to be sufficiently less than that of the foil barrier surrounding the first stage combustion chamber so as to achieve substantial equalization of pressure in the first and second stages.

DETAILED DESCRIPTION An object of the invention is to provide an improved automotive restraint gas generator which features simplicity and efficiency in the construction thereof that enables economic manufacture and assembly, and that is operative to effect a controlled delivery of a gas for inflating a passenger side airbag for providing protection for the out-of-position passenger.
Another object of the invention is to provide such an improved gas generator that is of maximum compactness and requires a minimum volume of space for installation in the dashboard of an automotive vehicle, on the passenger side thereof.
A further object of the invention is to provide a two-stage automotive restraint gas generator in which operation of a first stage responsively to an incipient collision is utilized by means of a delay body and ball valve to effect delayed initiation of a second stage, with the ball valve effecting a subsequent operation to stop repressurization of the first stage and thereby separating the action of the two stages.
Still another object of the invention is to provide such an improved two-stage gas generator in which the arrangement of the first stage is such as to provide rapid pressurization and release of inflation gas to the airbag and the arrangement of the second stage is such as to provide less rapid pressurization and release of inflation gas to the airbag thereby to increase the delay time between the actuations of the first and second stages.
In accomplishing these and other objectives of the invention, there is provided an improved automotive restraint gas generator having particular utility for use on the passenger side of an automobile or similar vehicle.
The gas generator comprises an inflator having first and second stages arranged in end-to-end relation in the same housing.
Specifically, each stage is assembled into an individually associated chamber in an impact extruded lightweight housing which may be made of aluminum.
A barrier or bulkhead positioned in suitably sealed relation at an intermediate location within the housing separates the two chambers

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