Air bag in air bag equipment

B - Operations – Transporting – 60 – R

Patent

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B60R 21/239 (2006.01) B60R 21/264 (2006.01)

Patent

CA 2021247

The air bag 3 according to this invention is furnished with exhaust outlet 6 to discharge internal gas, and the material 8 with heat-shrinking property is provided, which blocks at least a part of the exhaust outlet 6 in normal case and shrinks to such direction as to increase the passage area of said exhaust outlet when reaction gas is introduced from the inflator 2. Therefore, the passage area of the exhaust outlet 6 is relatively narrowed down by the heat-shrinking material 8 in normal case. For this reason, it is rapidly expanded by reaction gas from the inflator 2. Thereafter, the material 8 is shrinked by the heat of reaction gas and the passage area of exhaust outlet 6 is increased. Thus, more reaction gas flows out of air bag 3, and this alleviates the impact when the air bag 3 receives the person in the vehicle. In this case, the shrinking degree of the material 8 varies according to the ambient temperature, and the internal pressure of the air bag 3 is maintained at almost constant level regardless of atmospheric temperature. As the result, the air bag 3 can receive the person in the vehicle always in stable condition.

Coussin gonflable (3) équipé d'une bouche d'évacuation (6) permettant d'évacuer le gaz interne, et d'un matériau thermorétractable (8), qui en temps normal bloque au moins une partie de la bouche d'évacuation (6) et se rétracte dans une direction qui accroît l'ouverture de la bouche d'évacuation lors de l'expulsion de gaz par le dispositif de gonflage. Ainsi, en temps normal, le matériau thermorétractable (8) réduit relativement l'ouverture de la bouche d'évacuation (6), c'est pourquoi le coussin gonflable se dilate rapidement sous l'effet du gaz expulsé par le dispositif de gonflement. Ensuite, le matériau (8) se rétracte sous l'effet de la chaleur du gaz et l'ouverture de la bouche d'évacuation (6) s'agrandit. Par conséquent, une plus grande quantité de gaz s'échappe du coussin gonflable (3), ce qui permet d'amoindrir l'impact du passager du véhicule avec le coussin gonflable (3). Dans le cas de la présente invention, le degré de rétrécissement du matériau (8) varie selon la température ambiante, tandis que la pression interne du coussin gonflable (3) est maintenue à un niveau presque constant, peu importe la pression atmosphérique. Le coussin gonflable (3) est ainsi maintenu dans une condition stable, prête à recevoir l'impact du passager.

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