Protective device for protecting an occupant of a vehicle, a seat, and an associated vehicle

1. A protective device for protecting an occupant of a vehicle, the protective device comprising an airbag and an inflator for inflating the airbag, the inflator being connected to the airbag via a feed pipe for feeding inflation fluid for the purpose of inflating the airbag under predetermined conditions;

wherein the protective device further comprises expulsion means for expelling the fluid, which expulsion means co-operate with at least one detection means for detecting a predetermined event so as to act when such a predetermined event occurs to remove the fluid resulting from inflation of the airbag subsequently to inflation of the airbag, the airbag being provided with a peripheral elastic strap for optimizing the deflation of the airbag when the expulsion means allow the fluid to be removed from the airbag;

the inflator being connected to the airbag via the feed pipe, and a control unit connected to the inflator, the control unit instructing the inflator to inflate the airbag under the predetermined conditions; and

wherein the control unit includes an electrical battery and a changeover switch that are connected in series to the inflator, the expulsion means being connected electrically to the inflator and to the control unit.

2. A protective device according to claim 1 , wherein the expulsion means are arranged on the feed pipe.

3. A protective device according to claim 1 , wherein the event is to be chosen from a list including a presence of water, a presence of fire, and an opening of a seat harness subsequent to inflation of the airbag.

4. A protective device according to claim 1 , wherein, with the expulsion means comprising an outlet orifice and a moving member suitable for preventing inflation fluid from passing through the outlet orifice in the absence of the predetermined event, the detection means co-operate with the moving member to allow the inflation fluid to pass through the outlet orifice in the presence of the predetermined event.

5. A protective device according to claim 4 , wherein the detection means include water detection means provided with soluble means co-operating with the moving member.

6. A protective device according to claim 1 , wherein the detection means comprise a sensor for sensing the event, which sensor is connected electrically to a main switch arranged between the inflator and the expulsion means, the main switch being closed when the event occurs, a capacitor being connected electrically in parallel with the expulsion means and with the main switch between the inflator and the control unit.

7. A protective device according to claim 6 , having a secondary switch arranged between the control unit and the inflator and co-operating with the detection means.

8. A vehicle seat for a vehicle, wherein the seat includes a protective device according to claim 1 .

9. A vehicle seat according to claim 8 , wherein the airbag is arranged on a seat harness of the seat.

10. A vehicle seat according to claim 8 , wherein, with the seat having a seat proper zone and a seat back zone, the detection means are remote relative to the zones.

11. A vehicle, including a protective device according to claim 1 .

12. A protective device for protecting an occupant of a vehicle, the protective device comprising an airbag and an inflator for inflating the airbag, the inflator being connected to the airbag via a feed pipe for feeding inflation fluid for the purpose of inflating the airbag under predetermined conditions;

wherein the protective device further comprises expulsion means for expelling the fluid, which expulsion means co-operate with at least one detection means for detecting a predetermined event so as to act when such a predetermined event occurs to remove the fluid resulting from inflation of the airbag subsequently to inflation of the airbag, the airbag being provided with a peripheral elastic strap for optimizing the deflation of the airbag when the expulsion means allow the fluid to be removed from the airbag;

the inflator being connected to the airbag via the feed pipe, and a control unit connected to the inflator, the control unit instructing the inflator to inflate the airbag under the predetermined conditions; and

wherein the detection means comprise a sensor for sensing the event, which sensor is connected electrically to a main switch arranged between the inflator and the expulsion means, the main switch being closed when the event occurs, a capacitor being connected electrically in parallel with the expulsion means and with the main switch between the inflator and the control unit.

13. A protective device for protecting an occupant of a vehicle, the protective device comprising an airbag and an inflator for inflating the airbag, the inflator being connected to the airbag via a feed pipe for feeding inflation fluid for the purpose of inflating the airbag under predetermined conditions;

wherein the protective device further comprises expulsion means for expelling the fluid, which expulsion means co-operate with at least one detection means for detecting a predetermined event so as to act when such a predetermined event occurs to remove the fluid resulting from inflation of the airbag subsequently to inflation of the airbag, the airbag being provided with a peripheral elastic strap for optimizing the deflation of the airbag when the expulsion means allow the fluid to be removed from the airbag;

the inflator being connected to the airbag via the feed pipe, and a control unit connected to the inflator, the control unit instructing the inflator to inflate the airbag under the predetermined conditions; and

the protection device having a main switch and a secondary switch, the secondary switch being arranged between the control unit and the inflator and co-operating with the detection means.