Flame protection for a gas bag

Details Flame protection for a gas bag Flame protection for a gas bag

1999-01-13

2001-04-17

English, Peter C. (Department: 3619)

Land vehicles

Wheeled

Attachment

C280S743100

Reexamination Certificate

active

06217067

ABSTRACT:

FIELD OF THE INVENTION
The invention relates to an air bag module including a gas bag with an inlet opening, an inflator having a pyrotechnic propellant, and a flame protection.
BACKGROUND OF THE INVENTION
In igniting pyrotechnic propellants for explosively inflating a gas bag, gaseous combustion products materialize having very high temperatures which the material of the gas bag, consisting of a synthetic textile fabric, is unable to withstand. Accordingly, various proposals have already been made as to how gas bags of air bag modules may be configured and arranged so that they cannot be damaged or even destroyed by the hot combustion gases. Such means are termed “flame protection” and extend from sieve-type retaining systems intended to prevent the exit of hot solid particles from the inflator, via localized material doubling in the endangered region up to impregnating the gas bag all over with a heatproof material.
Where localized material doubling is proposed it cannot be assured that the regions of the gas bag first impacted by the hot combustion products are also reliably covered since the protective material may become displaced when being folding in place if it is not connected to the gas bag material. When the material is connected to the gas bag, however, difficulties are experienced in folding in place since the connected material doubling is automatically stiffer than the remaining gas bag material and may in turn result in irregularities when being folding in place so that unprotected material may lie in the region of the primary inflow of hot combustion products. In addition to this the means proposed for flame protection are often very complicated and costly.
SUMMARY OF THE INVENTION
It is thus the object to provide in an air bag module of the aforementioned kind an effective flame protection which is simply and cost-effectively achievable, applicable to the various methods of folding the gas bag, and which reliably prevents hot combustion gases from impacting the material of the gas bag before they have appreciable expanded and thus have had time to cool down.
To achieve this object it is proposed in accordance with the invention that the flame protection consists of a pot-shaped textile part of a heatproof material, the bottom of which comprises a central recess corresponding to the inlet opening of the gas bag, the rim of the central recess surrounding said inlet opening.
In a further development of the invention, a mounting plate is provided, the rim of said inlet opening surrounds said inflator and is clamped in place between said inflator and said mounting plate, and said rim of said central recess of said pot-shaped textile part together with said gas bag is clamped in place between said mounting plate and said inflator.


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