Patent Application
20050098985
The present invention relates generally to supplemental restraint systems of vehicles, and more particularly to an improved airbag that can be sequentially deployed for minimizing the risk of injury to an occupant's head and neck.
Driver's side airbags for supplemental restraint systems of vehicles are well known. Typical driver's side airbags are comprised of one or more panels, which form either a single chamber construction or a multiple chamber construction. One of these panels usually includes an inlet that is located at a center position of the panel. This inlet typically allows an inflator device to inject gas into the airbag for deploying the airbag.
The internal construction of these airbags usually causes the airbags to be deployed radially from the center outward. In this regard, various circumferential portions of the airbag can be simultaneously inflated with a substantially equal amount of force. In other words, the portions of the airbag intended to cushion the occupant's head and neck can be inflated at substantially the same time and with substantially the same force as the portions of the airbag intended to cushion the occupant's abdomen and lap.
A drawback of these airbags is that their radial deployment can result in substantial injuries to the occupant's head or neck. Specifically, it is understood that the force required to initially deploy or “punch out” the airbag from its steering-wheel housing can be substantially high. In particular, such a force can be sufficiently high for injuring the occupant's head or neck as the airbag impacts those body parts. Although the radial deployment of the airbag typically causes the airbag to impact the various parts of the occupant's body at substantially the same time and with substantially the same force, it will be appreciated that the occupant's abdomen and lap are less likely to be injured because those body parts typically are more durable for withstanding greater forces. Furthermore, it will be appreciated that the risk of injury can substantially increase when the occupant is sitting out of position. In particular, the deployment of existing airbags may substantially injure a driver's head or neck if the driver is leaning farther forward than a standard upright sitting position.
Another drawback of these airbags is that the radial deployment of the airbags usually does not control the kinematics of the occupant's body for minimizing his risk of injury. Specifically, the radial deployment of these airbags is merely intended to cushion or dampen the overall forces distributed to the occupant's entire body. In this respect, the radial deployment of these airbags typically does not control the method by which various parts of the occupant's body impact the airbag. As a result, one or more parts of the occupant's body may be positioned poorly for impacting the airbag. For example, the airbag may impact an occupant beneath his chin, e.g. his larynx, and force his head upward and rearward. Such a force can create substantial pressure in the vertebrae of the occupant's neck and possibly result in a serious neck injury.
Therefore, a need exists for an improved airbag with internal panel structure for sequentially deploying the airbag and decreasing an occupant's risk of injury as he impacts the airbag.
The present invention provides an improved airbag with one or more internal positioning panels for sequentially deploying the airbag and minimizing the risk of injury to a vehicle occupant. This improved airbag is an inflatable bag having a primary chamber and a secondary chamber that is adjacent to the primary chamber. The primary chamber is configured for inflating before the secondary chamber. In addition, this primary chamber is utilized for applying a generally downward force to a lower-body portion of the vehicle occupant. In this way, a substantial portion of the initial deployment force of the airbag is allocated to the occupant's more durable lower-body portion. Also, the primary chamber can be utilized for positioning the occupant's body in a manner best suited for impacting the airbag. This airbag is then sequentially deployed in a generally linear direction upward from the primary chamber to the secondary chamber.
One advantage of the present invention is that an improved airbag is provided that controls the kinematics of an occupant's body and the method by which he impacts the airbag so as to decrease his risk of injury.
Another advantage of the present invention is that an improved airbag is provided that distributes a greater portion of the airbag's initial deployment force to portions of the occupant's body, which are better suited for withstanding those forces without incurring an injury.
Yet another advantage of the present invention is that an improved airbag is provided that furnishes immediate protection for an occupant's head and neck.
Still another advantage of the present invention is that an improved airbag is provided that is sequentially deployable for decreasing the impact force between the airbag and the occupant's head and neck.
Other advantages of the present invention will become apparent upon considering the following detailed description and appended claims, and upon reference to the accompanying drawings.
For a more complete understanding of this invention, reference should now be made to the embodiments illustrated in greater detail in the accompanying drawings and described below by way of the examples of the invention:
In the following figures, the same reference numerals are used to identify the same components in the various views.
The present invention is particularly suited for an improved driver's side airbag for sequential two-stage deployment and minimizing a risk of injury during a front-end crash. In this regard, the embodiments described herein employ structural features where the context permits. However, it is understood that a variety of other embodiments without the described features are contemplated as well. For example, the improved airbag can be utilized for protecting various vehicle occupants besides the driver and in a variety of collisions, instead of front-end crashes. For this reason, it follows that the invention can be carried out in various other modes and utilized for other suitable applications as desired.
Referring to
With particular attention to
During the first stage of sequential deployment, the improved airbag 10 also controls the kinematics of the vehicle occupant 12 for preparing him to impact the remainder of the airbag 10 during the second stage of deployment. For example, as seen in
Furthermore, in the first stage of deployment, the improved airbag 10 includes a vertical columnar portion for providing immediate protection for the occupant's upper body region, e.g. his head and neck. This vertical columnar portion is defined by an upper sub-chamber 42 of the airbag 10 (as detailed in the description for
Referring now to
However, it will be appreciated that the inflatable bag can instead be comprised of only one panel, two panels, or various other numbers of panels as desired. For example, in another embodiment illustrated in
With particular attention to
The primary chamber 34 includes an upper sub-chamber 42 and a lower sub-chamber 44, which together extend substantially across a height of the improved airbag 10. As respectively shown in
Moreover, as seen in
Although the upper sub-chamber 42 is sized smaller than the lower sub-chamber 44, it will be appreciated that the upper sub-chamber 42 is sized sufficiently large for providing immediate protection for the occupant's upper body region during the first stage of deployment.
The inner panel 32 has a secondary inlet 46 formed therein for permitting gas to flow from the primary chamber 34 to the secondary chamber 36 during the second stage of deployment. However, during the first stage of deployment, the secondary chamber 36 is held in a collapsed or deflated configuration until the primary chamber 34 is substantially inflated and a threshold pressure has been built up within the primary chamber 34. Specifically, the second outer panel 30 is attached to the inner panel 32 by a releasable tether 48. In this way, the releasable tether 48 can restrict the size of the secondary chamber 36 and prevent that portion of the airbag 10 from being inflated. The releasable tether 48 detaches from either the inner panel 32 or the second outer panel 30 when sufficient pressure has built up in the primary chamber 34, e.g. after that chamber 34 has been fully deployed. Thereafter, the secondary chamber 36 of the airbag 10 can be inflated during the second stage of deployment.
In one embodiment, the releasable tether 48 is a relatively small amount of stitching with a substantially weak threading. In that regard, the threading can break when gas flows into the secondary chamber 36 with sufficient pressure. However, it is understood that the releasable tether 48 can instead be various other suitable tethers as desired.
Referring back to
In another embodiment, the secondary inlet 46 is a baffle vent for metering the flow of gas into the secondary chamber 36. As a result, the baffle vent can further control the timing and force by which the secondary chamber is deployed. This feature is beneficial because it can decrease the speed and the force by which the secondary chamber 36 inflates. This controlled inflation likewise decreases the speed and the force by which the airbag 10 impacts the occupant's relatively fragile head 20 and neck 22.
In yet another embodiment, the secondary inlet 46 is simply a permeable fabric comprising the inner panel 32 or a portion thereof. Similar to the baffle vent, this permeable fabric can meter the flow of gas into the secondary chamber 36 and further protect the occupant's head 20 and neck 22.
With particular attention to
While particular embodiments of the invention have been shown and described, it will be understood, of course, that the invention is not limited thereto since modifications may be made by those skilled in the art, particularly in light of the foregoing teachings. Accordingly, it is intended that the invention be limited only in terms of the appended claims.
