IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0811471
(2008-01-15)
|
등록번호 |
US-8128123
(2012-03-06)
|
국제출원번호 |
PCT/GB2008/000122
(2008-01-15)
|
§371/§102 date |
20100701
(20100701)
|
국제공개번호 |
WO2009/090356
(2009-07-23)
|
발명자
/ 주소 |
- Johanson, Mats Bo Ivar
- Svärd, Björn
|
출원인 / 주소 |
|
대리인 / 주소 |
Harness, Dickey & Pierce, P.L.C.
|
인용정보 |
피인용 횟수 :
3 인용 특허 :
9 |
초록
▼
An inflator for an airbag comprises a bottle (2) containing a pressurized oxidizable gas and a bottle (4) containing a pressurized oxidizing gas, the bottles being connected with a structure (12, 16) providing a chamber (14) that has an outlet, for example provided by a conduit (16), for connection
An inflator for an airbag comprises a bottle (2) containing a pressurized oxidizable gas and a bottle (4) containing a pressurized oxidizing gas, the bottles being connected with a structure (12, 16) providing a chamber (14) that has an outlet, for example provided by a conduit (16), for connection with a vehicle airbag. The bottles have respective first discharge openings (18) and further discharge openings (18a) sealed by respective sealing foils. The inflator includes a first pyrotechnic squib (22) which when fired causes the sealing foils over the first openings (18) to rupture to allow the gases from bottles (2, 4) to pass into chamber (14) and then into the airbag, and also includes a further pyrotechnic squib (22a) which is fired some time after the squib (22) and causes the sealing foils over the further openings (18a) to boost the discharge of gases from the gas bottles. In this way, and by selecting the relative sizes of the first and further discharge openings (18,18a) the inflation rate of the air bag with respect to time can be fitted to a desired profile.
대표청구항
▼
1. An inflator for an airbag comprising: a first bottle containing a pressurized oxidisable gas and a second bottle containing a pressurized oxidising gas, the first and second bottles being connected with a structure providing a chamber with at least one outlet for communication with such vehicle a
1. An inflator for an airbag comprising: a first bottle containing a pressurized oxidisable gas and a second bottle containing a pressurized oxidising gas, the first and second bottles being connected with a structure providing a chamber with at least one outlet for communication with such vehicle airbag, the first and second bottles each having a first discharge opening sealed by respective sealing means sealing off the interiors of the first and second bottles from the chamber, the inflator including first operating means which can be activated to cause or allow the seals provided by the sealing means to be broken to allow the gases from the first and second bottles to pass into the chamber and thence via the outlet or outlets into such airbag, at least one of the first and second bottles having a further discharge opening, sealed by its own sealing means, the inflator including further operating means operable with a different timing from the first operating means, or operable in a sub-set of the circumstances in which the first operating means is operable, for causing or allowing the seal provided by the sealing means for the further discharge opening to be broken to allow gas to escape from the further discharge opening into the chamber and thence to the airbag. 2. The inflator according to claim 1, including a conduit extending from the chamber for connection with such airbag and providing the outlet or outlets. 3. The inflator according to claim 1, wherein the first operating means and the further operating means each include a respective piston movable along a respective complementary cylinder by pressure of gases generated by a respective pyrotechnic squib, when the latter is ignited. 4. The inflator according to claim 1, wherein the first operating means includes a piston movable along a complementary cylinder by pressure of gases generated by a pyrotechnic squib when the latter is ignited, whilst the further operating means is operable in some other way. 5. The inflator according to claim 1, in combination with an airbag, wherein the first operating means includes a piston movable along a complementary cylinder by pressure of gases generated by a pyrotechnic squib when the latter is ignited, whilst the further operating means includes a strap or ligature coupled to the airbag so as to pull an unsealing element of the second operating means at a predetermined stage in the deployment of the airbag. 6. The inflator according to claim 1, wherein the first operating means includes a piston movable along a complementary cylinder by pressure of gases generated by a pyrotechnic squib when the latter is ignited, whilst the further operating means comprises a mechanism operable by decelerational or accelerational G-forces. 7. The inflator according to claim 1, wherein both of the first and second bottles have respective further discharge openings, sealed by respective further sealing means, with the further operating means being operable to cause or allow the seals provided by the sealing means for the further discharge openings of both of the first and second bottles to be broken. 8. The inflator according to claim 7, wherein the further discharge openings of the first and second bottles are of different sizes from one another. 9. The inflator according to claim 1, wherein each of the first and second gas bottle has the first discharge opening sealed by a respective rupturable foil, and the first operating means which can be activated to cause or allow the respective seals for the first discharge openings to be broken includes respective support members engaging the rupturable foils to maintain the rupturable foils in an unruptured state, the support members being retained in position by parts carried by a piston movable along a complementary cylinder by pressure of gases generated by a first pyrotechnic squib and which parts directly engage the support members, the arrangement being such that movement of such piston along its cylinder as a result of firing the associated squib thereby moves the parts carried by the respective piston past the respective support members, permitting the support members to move to positions in which the foils will rupture to permit gas to escape from the bottle. 10. The inflator according to claim 9, wherein the or each of the further discharge opening is likewise sealed by a rupturable foil, or by respective rupturable foils, the further operating means likewise including a respective further support member or support members engaging the rupturable foil or foils sealing the further discharge opening or openings to maintain the last noted foils in an un-ruptured state, the or each of the further support member being retained in position by a part carried by a further piston moveable in a further complementary cylinder by pressure of gases generated by a further pyrotechnic squib, the arrangement likewise being such that movement of the further piston along the further cylinder as a result of firing the further squib thereby moves the part of the further piston past the further support member or members, permitting the further support member or members to move to a position or positions in which the foils covering the further openings will rupture to permit gas to escape also through the further discharge opening or openings. 11. The inflator according to claim 10, wherein each of the first and second bottles has a respective further discharge opening with a respective further sealing foil and a respective further support member and the further piston is common to the further operating means for both the further discharge openings. 12. The inflator according to claim 1, wherein, in at least one of the first and second bottles, partitioning means is provided dividing the interior of the at least one bottle into a first volume communicating with the first discharge opening of the bottle and a second volume communicating with the further discharge opening of the at least one bottle. 13. The inflator according to claim 1, wherein the further discharge opening in one of the bottles is larger or smaller than the further discharge opening in that bottle. 14. The inflator according to claim 1, in combination with control means by which the sequence and timing of the activation of the first and further operating means is controllable to control inflator performance according to the circumstances of particular crash situations. 15. The inflator according to claim 1, in combination with control means operable to activate only the first operating means, or only the further operating means, or to activate the first operating means followed by the further operating means, or to activate the further operating means followed by the first operating means, according to the circumstances of particular crash situations. 16. The combination according to claim 14, wherein the control means is operable in dependence on signals from sensors. 17. The combination according to claim 15, wherein the control means is operable in dependence on signals from sensors.
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