Occupant protection device with active ventilation

Abstract

Device for protecting a vehicle occupant, comprising an inflatable vehicle occupant protection device (14) with a web (114) that at least partially defines an inflatable volume (54) of the vehicle occupant protection device (14); and a vent (100), characterized in that the vent (100) comprises a side wall extending through the web (114) and defining a passage (134) for draining inflation medium from the inflatable volume (54), wherein the vent (100) comprises a first section (102) that can extend into the inflatable volume (54) and an opposing second section (104) that extends outside the inflatable volume (54);wherein the vent (100) has an open state in which the first section (102) is held in the inflatable volume (54) and thereby allows the inflation medium to be released through the passage (134), and wherein the vent (100) has a closed state in which the first section (102) is inverted and arranged in the second section (104) to prevent the inflation medium from escaping through the passage (134).

Description

[0001] The present invention relates to a device for protecting a vehicle occupant. In particular, the present invention relates to an occupant protection device with a vent for releasing inflation medium from an inflatable airbag.

[0002] It is known to provide an occupant protection device with an inflatable vehicle occupant protection device, such as an airbag, to protect a vehicle occupant. One specific type of airbag is a frontal airbag, which inflates between an occupant in a front seat of the vehicle and the vehicle's dashboard. Such airbags can be driver's airbags or front passenger airbags. When inflated, the driver's and front passenger airbags protect the occupant from impact with parts of the vehicle, such as the dashboard and / or the steering wheel.

[0003] Driver's side airbags are normally stored in a deflated state within a housing attached to the steering wheel. An airbag cover can be connected to the housing and / or the steering wheel to enclose and conceal the airbag when deflated. When the passenger airbag deploys, the airbag flap opens, allowing the airbag to move into an inflated position. The airbag flap opens due to the forces exerted on it by the inflating airbag.

[0004] Passenger airbags are normally stored in a deflated state within a housing attached to the vehicle's dashboard. An airbag cover connects to the housing and / or the dashboard to enclose and conceal the airbag when deflated. When the passenger airbag deploys, the airbag cover opens, allowing the airbag to move into an inflated position. The airbag cover opens due to the forces exerted on it by the inflating airbag.

[0005] It may be desirable to release inflation medium from an airbag to achieve desired performance characteristics, such as desired slippage properties. To achieve this function, the airbag can have vents that are actively actuated depending on detected vehicle states, occupant states, or a combination of these. Additionally or alternatively, the airbag and vents can be designed such that the venting is passively actuated depending on vehicle states, occupant states, or a combination of these.

[0006] An embodiment of a passive vent is shown in US 2009 / 0289444A1. This vent has a valve connected to a retaining strap, which is connected to the airbag casing in such a way that the valve remains in an open position only if the airbag cannot deploy freely, for example, due to an occupant being too close to the instrument panel (Out of Position - OOP) and thus to the airbag.

[0007] An actively actuated vent is shown, for example, in US patent 2006 / 0151975A1, where the vent is formed by a passage in the airbag casing. On opposite sides of this passage, a simple, flat piece of fabric is attached to the inside of the airbag by seams and is additionally secured with a retaining strap. When the retaining strap is not released, the flat piece of fabric is pulled inwards, thus opening the passage and allowing gas to escape. When the retaining strap is released, however, the flat piece of fabric is pressed against and through the opening, thereby preventing gas from escaping.

[0008] US Patent 2004 / 0012179A1 shows a vent that is also formed by a passage in the airbag casing. In this vent, the passage is closed when the retaining strap is not released and open when the retaining strap is released. For this purpose, the fabric flap has an opening and is connected to a multi-part retaining strap, so that after the retaining strap is released, the fabric flap is pulled over the passage opening so that its opening is positioned over the passage opening.

[0009] The object of the invention is therefore to create an active ventilation system for a device with an inflatable vehicle occupant protection device, through which gas can reliably and in a defined manner escape if a retaining strap is not released, and which reliably prevents outflow if the retaining strap is released.

[0010] The present invention relates to a device for protecting a vehicle occupant. The device comprises an inflatable vehicle occupant protection device with a panel that at least partially defines an inflatable volume of the protection device. A vent according to the invention comprises a side wall extending through the panel and providing a passage for releasing inflation medium from the inflatable volume. The vent has a first section that can extend within the inflatable volume and an opposing second section that extends outside the inflatable volume.The vent has an open state, in which the first section is held in the inflatable volume, thus allowing the inflation medium to drain through the passage, and a closed state, in which the first section is turned inside out and placed in the second section, thus preventing the inflation medium from draining through the passage.

[0011] Preferably, the invention further comprises a retaining strap having a first end section connected to the first section of the vent and a second end section detachably anchored in the vehicle.

[0012] For this purpose, the retaining strap can be released to close the vent, and the retaining strap holds the vent in the open position when anchored.

[0013] It is preferred that the side wall comprises a cylindrical tube and that the second section of the vent has a diameter that is smaller than the diameter of the first section of the vent.

[0014] It is preferred that the first section of the side wall has a bottom section arranged adjacent to the web, wherein the first section has a conical shape extending away from the bottom section into the inflatable volume, wherein the second section of the side wall has a bottom section arranged adjacent to the web and has a conical shape extending outwards and away from the inflatable volume, and that the conical side wall of the first section corresponds to the conical side wall of the second section when the vent is in the closed state.

[0015] It is preferred that the side wall has a generally tubular construction, wherein the side wall has a cross-sectional shape corresponding to an opening in the web through which the side wall extends, and that the side wall is connected to a section of the web extending around the circumference of the opening.

[0016] It is preferred that the second section of the vent has a cross-sectional area that is smaller than the cross-sectional area of ​​the first section of the vent.

[0017] It is preferred that the first section of the vent has vent openings extending through the side wall, and that the first and second sections are configured such that when the first section is inverted and positioned in the section of the passage defined by the second section, it corresponds to and is bounded by the second section, causing the side wall of the first section to be pressed against the side wall of the second section by the pressure of the inflation medium in the inflatable volume, thereby forming a seal between the first and second sections that prevents inflation fluid from leaking out through the vent openings, and that the first section is configured such that the vent openings are positioned on an inner wall of the second section of the vent when the vent is in the closed state.

[0018] It is preferred that the vent openings create a flow connection between the inflatable volume of the protective device and the passage when the vent is in the open state, allowing inflation medium to flow through the openings and through the passage to drain inflation fluid from the protective device.

[0019] It is preferred that the first section is designed such that the pressure of the inflation medium in the inflatable volume acts on the first section to ensure that the first section is turned inside out and positioned in the second section, and that the first section of the vent has a closed end, wherein the pressure of the inflation medium in the inflatable volume acts on the closed end of the first section to ensure that the first section is turned inside out and positioned in the second section.

[0020] The present invention also relates to a device for protecting a vehicle occupant. The device comprises an inflatable vehicle occupant protection device and a vent for releasing the inflation medium from the protection device. The vent has a conduit with a first section extending inside the protection device and a second section extending outside the protection device. A retaining strap has a first end section connected to the first section of the vent and a second end section detachably anchored in the vehicle. The vent is in an open state in which the retaining strap is anchored and thereby holds the first section in position within the protection device, allowing the inflation medium to be released through the conduit.The vent has a closed state in which the retaining strap is released, allowing the first section to be turned inside out and positioned in the second section, thus preventing inflation medium from being drained through the line.

[0021] It is preferred that the first section of the line has a closed end and vent openings extending through a side wall of the line, and that the vent openings create a flow connection between the protective device and the line when the vent is in the open state, thereby allowing the flow of inflation medium through the openings and through the line to drain inflation fluid from the protective device.

[0022] It is preferred that the first section is designed such that the vent openings are positioned on an inner wall of the second section of the line when the vent is in the closed state, and that the first section is designed such that the pressure of the inflation medium in the protective device acts on the first section to ensure that the first section is turned inside out and positioned in the second section.

[0023] The present invention further relates to a device for protecting a vehicle occupant. The device comprises an inflatable vehicle occupant protection device and a vent with a first and second tubular section. The second tubular section extends outside the protection device. The vent has an open state in which the first tubular section runs inside the protection device, thereby allowing the release of inflation medium through the vent. The vent has a closed state in which the first tubular section is inverted and extends at least partially into the second tubular section. In the closed state, the second tubular section prevents inflation medium from being released through the vent.

[0024] It is preferred that a retaining strap is further provided, comprising a first end section connected to the first tubular section and a second end section anchored in the vehicle, wherein the anchored retaining strap holds the vent in the open state, and wherein the anchored second end section of the retaining strap is releasable to move the vent into the closed state.

[0025] It is preferred that the protective device comprises a membrane which at least partially defines an inflatable volume of the protective device, wherein the first and second tubular sections have sections with a tubular structure which extends through an opening in the membrane and is connected to sections of the membrane surrounding the opening, wherein the first tubular section is designed such that the pressure of the inflation medium in the protective device acts on the first tubular section to ensure that the first tubular section is inverted and positioned in the second tubular section.

[0026] The present invention also relates to a device for protecting a vehicle occupant. The device comprises an inflatable vehicle occupant protection device and a vent with a first and second conical section. The second conical section extends outside the protection device. The vent has an open state in which the first conical section extends inside the protection device, thereby allowing the release of inflation medium through the vent. The vent has a closed state in which the first conical section is inverted and extends at least partially into the second conical section. In the closed state, the second conical section prevents inflation medium from being released through the vent.

[0027] It is preferred that a retaining strap is further provided with a first end section connected to the first conical section and a second end section anchored in the vehicle, wherein the anchored retaining strap holds the vent in the open state, wherein the anchored second end section of the retaining strap is releasable to move the vent into the closed state.

[0028] It is preferred that the protective device comprises a sheet which at least partially defines an inflatable volume of the protective device, wherein the sheet has an opening through which released inflation medium flows, wherein the first and second conical sections have respective bottom sections which are connected to sections of the sheet surrounding the opening, wherein the first conical section extends away from the sheet into the inflatable volume and the second conical section extends away from the sheet outside the inflatable volume.

[0029] It is preferred that the first conical section is designed such that the pressure of the inflation medium in the protective device acts on the first conical section to ensure that the first conical section is turned inside out and positioned in the second conical section.

[0030] An embodiment not belonging to the invention relates to a device for protecting a vehicle occupant. The device comprises an inflatable vehicle occupant protection device and a vent for draining inflation medium from an inflatable volume of the protection device. The vent comprises at least one section with opposing first and second sections that define a discharge chamber. The second section has at least one vent opening that establishes a flow connection between the inflatable volume and the discharge chamber, and a discharge opening that establishes a flow connection between the discharge chamber and the outside of the protection device via an opening in one section of the protection device.The vent has an open state in which the first section of the at least one layer is spaced apart from the second section of the at least one layer, thereby allowing the flow of inflation medium from the inflatable volume into the discharge chamber via the at least one vent opening and to the outside of the protective device via the discharge opening and the opening in the protective device layer. The vent has a closed state in which the first section of the at least one layer is pressed against the second section of the at least one layer, thereby preventing the flow of inflation medium from the inflatable volume into the discharge chamber via the at least one vent opening.

[0031] In this embodiment, which is not part of the invention, a retaining strap is further provided, which is connected to the second section of the at least one track, and an actuating device that releasably anchors the retaining strap in the vehicle, wherein the retaining strap holds the vent in the open state when the actuating device is held in a non-actuated state, and the actuating device, when actuated, releases the retaining strap and thereby closes the vent, wherein the first and second sections comprise separate first and second tracks which are connected to each other over their respective circumferences to define the discharge chamber, wherein the second track has the discharge opening and is positioned such that it overlaps the protective track so that the discharge opening is aligned with the vent opening.wherein a section of the second track surrounding the discharge opening is connected to a section of the protective track that surrounds the opening in the protective track.

[0032] In this embodiment, which is not part of the invention, it is preferred that the retaining strap is connected to the first track at a point that is aligned with the discharge opening in the second track, and that the vent openings are spaced apart around the discharge opening in the second track.

[0033] Further advantageous embodiments of the invention are the subject of the respective dependent claims.

[0034] Further details and features of the invention are explained below with reference to preferred embodiments and the attached drawings. These show: Fig. Figure 1A shows a schematic side view of a device for protecting an occupant of a vehicle according to a first embodiment of the invention, illustrating the device in an uninflated and stowed state; Fig. Figure 1B shows a schematic side view of the device. Fig. 1A, which illustrates the device in a first inflated and unfolded state; Fig. Figure 1C shows an enlarged view of a section of the device. Fig. 1B; Fig. 2A shows a schematic side view of the device made of Fig. 1A, which illustrates the device in a second inflated and unfolded state; Fig. Figure 2B shows an enlarged view of a section of the device. Fig. 2A; Fig. 3A and Fig. Figure 3B shows enlarged views illustrating a section of the device in different states according to the first embodiment of the present invention; Fig. 4A and Fig. Figure 4B shows enlarged views illustrating a section of the device in different states according to a second embodiment of the present invention; Fig. Figure 5A shows a schematic side view of a device for protecting a vehicle occupant according to an embodiment not belonging to the invention, illustrating the device in an inflated and unfolded state; and Fig. 5B and Fig. 5C show enlarged views that depict a section of the device not belonging to the invention. Fig. Illustrate 5A in different states.

[0035] A device 10 for protecting an occupant 20 of a vehicle 12 comprises an inflatable vehicle occupant protection device in the form of an airbag 14. In the Fig. In the embodiment illustrated in Figures 1A-2B, the airbag 14 is a front passenger airbag for the protection of an occupant 20 on a seat 22 on the passenger side 24 of the vehicle 12.

[0036] The airbag 14 can be part of an airbag module 30, which includes a gas generator 32 and a bracket or housing 34 for the airbag and the gas generator. The airbag 14 comprises a stowed state, which is shown by dashed lines 14 in Fig. Figure 1A shows the airbag folded and installed in the housing 34. The module 30 is attached to the dashboard 36 of the vehicle 12 in a known manner. The housing 34 contains and supports the airbag 14 and the gas generator 32 in the dashboard 36.

[0037] An airbag flap 40 is detachably connected to the dashboard 36 and / or the housing 34. In a closed position, the airbag flap 40 forms a cover for the module 30 and encloses the airbag 14 when stowed in the housing 34. The flap 40 can be moved to an open position, as shown in Fig. 1B and Fig. 2A shows an opening 44 through which the airbag 14 can be deployed from its stowed position in the housing 34. The flap 40 can be connected to the instrument panel 36 either directly or via the housing 34 by means (not shown) such as a plastic hinge section, a band, or a retaining strap.

[0038] The gas generator 32 can be actuated to provide inflation medium for an inflatable volume 54 of the airbag 14 in order to deploy the airbag into the inflated state. Any known type of gas generator 32 can be used, such as stored gas, solid propellant, enriched gas, or a hybrid. The device 10 also includes a sensor / control unit, shown schematically at 50, for detecting an event in which inflation of the airbag 14 is desired, such as a collision, and providing an actuation signal for the device 10 depending on the detected event. The gas generator 32 is operatively connected to the sensor 50 via connecting lines 52.

[0039] The airbag 14 can be manufactured from any suitable material, such as nylon (e.g., 6-ply nylon fabric), and can have any suitable construction. For example, the airbag 14 can consist of one or more pieces or sheets of material. If more than one piece or sheet is used, these can be joined together to form the airbag by known methods such as stapling, ultrasonic welding, hot melt bonding, or adhesives. The airbag 14 can be uncoated, coated with a material such as gas-impermeable urethane, or laminated with a material such as a gas-impermeable film. Thus, the airbag 14 can have a gas-tight or substantially gas-tight construction. Those skilled in the art will recognize that alternative materials such as polyester yarn and alternative coatings such as silicone can also be used to construct the airbag 14.

[0040] When an event is detected that requires the inflation of the airbag 14, such as a vehicle collision, the sensor 50 sends a signal to the gas generator 32 via the connecting lines 52. Upon receiving the signal from the sensor 50, the gas generator 32 is activated and supplies the inflatable volume 54 of the airbag 14 with inflation medium in a known manner. The inflating airbag 14 exerts a force on the flap 40, which moves the flap into the open position. The airbag 14 inflates from its stowed state to a deployed state, as described in Fig. Figure 1 shows the fully inflated and deployed state, depicted in solid lines. When inflated, the airbag 14 helps to protect the vehicle occupant 20 from impact with parts of the vehicle 12, such as the dashboard 36.

[0041] According to the present invention, the device 10 has a vent 100 which can be actuated to release inflation medium from the airbag 14. The design of the vent 100 is described in the Fig. 3A and Fig. Figure 3B schematically illustrates the vent 100, which generally has a conical structure and forms a channel extending through an opening 116 in a wall 114 of the airbag 14. The opening 116 has a shape that corresponds to the cross-sectional shape of the vent 100 at its interface with the wall 114. Thus, in the embodiment of Fig. 3A and Fig. 3B circular.

[0042] Regarding the Fig. 3A and Fig. 3B comprises the vent, a first section with a conical inner wall 102 and a second section with a frustoconical outer wall 104. The inner and outer walls 102 and 104 share a common central axis 106. As shown in the Fig. 3A and Fig. As shown in Figure 3B, the respective floor sections 110 and 112 of the inner and outer walls 102 and 104 meet at the airbag wall 114, where they are connected to the airbag 14 via the circumference of the opening 116 in the wall 114. As shown in the Fig. 3A and Fig. As shown in Figure 3B, the inner and outer walls 102 and 104 can have congruent or substantially congruent shapes, in which their respective bottom sections 110 and 112 have the same or substantially the same diameters and the respective walls run at the same or substantially the same angles with respect to the common axis 106.

[0043] The inner wall 102 tapers downwards from the bottom section 110 and extends away from the airbag wall 114 into the inflatable volume 54 of the airbag 14. The outer wall 104 tapers downwards from the bottom section 112 and extends away from the airbag wall 114 and from the airbag 14 outside the inflatable volume 54 of the airbag 14. The frustoconical outer wall 104 has an open end section 120, which defines an outlet 122 of the vent 100. The outer wall 104 defines a passage or discharge chamber 134 through which inflation medium can flow directly to the outlet 122. The inner wall 102 has a closed end section 124, to which a first end section 152 of a vent belt 150 is connected. The inner wall 102 has several ventilation openings 132 spaced around its perimeter. In the Fig. 3A and Fig. In the embodiment illustrated in Figure 3B, the openings 132 generally have a circular shape. However, the openings 132 could also have alternative configurations. For example, the openings could comprise elongated slots, X-shaped slots, cross-shaped slots, T-shaped slots, Y-shaped slots, or other openings of suitable shape.

[0044] The vent 100 has a Fig. 3A shown, open state as well as one in Fig. 3B shows the closed state. In the open state of the Fig. 3A The venting strap 150 otherwise tensions or pulls / holds the inner wall 102 in an open state that lies at least partially within the inflatable volume 54 of the airbag 14. The venting strap 150 substantially or completely prevents the inner wall 102 from entering the discharge chamber 134. In the open state, a fluid connection is established between the inflatable volume 54 and the atmosphere surrounding the airbag 14 via the vent openings 132, the discharge chamber 134, and the outlet 122. In the open state, the venting strap 150 holds the inner wall 102 in this open state, which extends into the inflatable volume 54 against the pressure of the inflation medium in the airbag 14.

[0045] When closed, the Fig. 3B does not otherwise tension or pull / hold the inner wall 102 in the open state, which lies within the inflatable volume 54 of the airbag 14. The inner wall 102 can thus move freely depending on the pressure of the inflation medium within the inflatable volume 54 of the airbag 14. Under the pressure of the inflation medium in the inflatable volume 54, the inner wall 102 moves into a closed state, which lies at least partially within the discharge chamber 134 defined by the outer wall 102. In the closed state, the inner wall 102 is turned inside out from the open state. Since the inner wall 102 and the outer wall 104 have congruent or substantially congruent shapes, the inner wall 102, in the closed state, lies over and follows the contour of the outer wall 104, thereby forming a press fit between the walls.

[0046] According to the present invention, the vent openings 132 are arranged on corresponding sections of the outer wall 104 when the vent 100 is closed. Since the conical inner wall 102 is closed at the end section 124, the pressure of the inflation medium in the airbag presses the sections of the inner wall 102 surrounding the vent openings 132 against the corresponding sections of the outer wall 104. Consequently, the outer wall 104 restricts the inner wall 102 and essentially blocks the flow between the inflatable volume 54 and the atmosphere surrounding the airbag 14. The release of inflation medium is thus prevented when the vent 100 is closed.

[0047] Thus, the person skilled in the art will recognize that the vent 100 releases inflation medium from the inflatable volume 54 of the airbag 14 when the vent strap 150 holds the vent, in particular the inner wall 102, in the open state ( Fig. 3A). The person skilled in the art will further recognize that the vent 100 prevents inflation fluid from being released from the inflatable volume 54 of the airbag 14 when the vent strap 150 releases the vent, in particular the inner wall 102, for movement into the closed state ( Fig. 3B).

[0048] Since the displacement of the inner wall 102, which moves the vent 100 into the closed state, occurs passively depending on the pressure of the inflation medium in the inflatable volume 54 (more precisely, depending on the pressure difference between the inflatable volume 54 in the airbag 14 and the atmosphere surrounding the airbag 14), the device 10 can be designed such that the actuation of the vent 100 depends on whether the vent strap 150 is anchored in the vehicle 12. Those skilled in the art will recognize that the airbag 14 can be designed such that, when the vent strap 150 is anchored, a displacement of the inner wall 102 during airbag deployment can ensure that the vent strap is tensioned and thereby holds the vent 100 in the open state, as described above.Similarly, the person skilled in the art will recognize that the airbag 14 may be designed such that, when the venting belt 150 is released from its anchoring, the inner wall 102 is released in a similar manner, allowing the inner wall and thus the vent 100 to remain in the closed state, as described above.

[0049] The venting belt 150 is an adaptive restraint belt in that it adjusts the state of the venting 100 according to vehicle conditions, occupant conditions, or a combination of both, when an event occurs that triggers the inflation and deployment of the airbag. For this purpose, the venting belt 150 has a second end section 154 opposite the first end section 152, which is anchored to the vehicle 12 via an actuating device 160 (see Fig. 1A-2B). The actuating device 160 is supported by a structure in the vehicle 12, such as the housing 34. The actuating device 160 can, for example, be an actuating fastener such as a pyrotechnic bolt, which can be actuated to interrupt or release the connection of the second end section 154 of the venting belt 150 to the housing 34. The person skilled in the art will recognize that the actuating fastener could be replaced by an alternative device. For example, the actuating device 160 can comprise an actuating snap lock, a magnetic mechanism, or actuated blades or scissors.

[0050] In an actuated state of the actuating device 160, the connection of the ventilation belt 150 to the vehicle 12 is interrupted or released. This is in the Fig. 1B and Fig. 1C is shown. As in the Fig. 1B and Fig. As shown in Figure 1C, the actuating device 160, when actuated, releases the connection between the second end section 154 of the venting belt 150 and the vehicle 12. This releases the inner wall 102 of the vent 100, which then moves into the closed position under the pressure of the inflation medium in the inflatable volume 54 of the airbag 14 (see also Fig. 3B). The vent 100 is thus brought into the closed state depending on the actuation of the actuable device 160.

[0051] In a non-actuated state of the actuated device 160, the anchoring of the vent strap 150 in the vehicle 12 is maintained. This is described in the Fig. 2A and Fig. 2B shown. As in the Fig. 2A and Fig. As shown in Figure 2B, the actuating device 160, in the unactuated state, maintains the connection between the second end section 154 of the venting belt 150 and the vehicle 12. This holds the inner wall 102 of the vent 100 in the open state against the pressure of the inflation medium in the inflatable volume 54 of the airbag 14 (see also Figure 2B). Fig. 3A). The vent 100 is thus kept in the open state depending on whether the actuable device 160 is actuated.

[0052] When an event occurs in which the inflation of the airbag 14 is desired, the device 10 of the present invention reacts to vehicle states, occupant states, or both, in order to control the inflation and deployment of the airbag and the actuation of the vent 100. According to the embodiment of the Fig. In 1A-3B, this control is actively carried out based on detected states in the vehicle 12. To achieve this function, the device 10 also has a control unit, schematically represented by 140, for actuating the actuating device 160. The control unit 140 is operatively connected to the actuating device 160 via connecting lines 142. When an event occurs in which the inflation of the airbag 14 is desired, such as a collision, the control unit 140 determines whether the actuating device 160 (and thus the vent 100) is actuated based on vehicle states, occupant states, or both vehicle and occupant states at the time of the detected event.

[0053] The control unit 140 also interacts with sensors that emit signals which the control unit can use to derive or determine the vehicle / occupant states. For example, in the Fig. As shown in Figures 1A to 2B, the device 10 can have one or more sensors 144 which can transmit a signal to the control unit 140 via connecting lines 142, indicating a detected seat position, a detected weight on the vehicle seat 22, the detected presence of an occupant 20 on the vehicle seat, or a combination of these conditions. Via the control unit 140 and the sensors 144, the device 10 can, for example, react to the size or position of the vehicle occupant 20. Alternative sensors, such as optical or ultrasonic sensors, can also be used to determine the presence and / or position of an occupant 20 on the seat 22.

[0054] For example, in relation to the Fig. In Figures 1A-2B, the occupant designated 20' and shown in dashed lines is positioned relatively close to the dashboard 36 and thus relatively close to the airbag module 30. This might be the case, for example, with a relatively small occupant such as a child or a small female occupant. This is illustrated in comparison to the larger occupant shown with solid lines at 20, who might be, for example, an average-sized or tall adult male. A person skilled in the art will recognize that the smaller occupant 20' can adjust the vehicle seat 22' to a position in front of the seat 22 of the larger occupant 20. The smaller occupant 20' can also exert less weight on the vehicle seat 22'.

[0055] According to the present invention, when the front-positioned occupant 20' is detected and depending on the detection of the event requiring occupant protection, the control unit 140 holds the actuating device 160 in the unactuated state, which keeps the vent 100 in the open state. The device 10 is thus able to release inflation medium from the inflatable volume 54 depending on the detection of the front-positioned occupant 20'. When the rear-positioned occupant 20' is detected and depending on the detection of the event requiring occupant protection, the control unit 140 actuates the actuating device 160, which closes the vent 100. The device 10 is thus able to prevent inflation medium from being released from the inflatable volume 54 depending on the detection of the rear-positioned occupant 20'.

[0056] The adaptive functionality of the device 10 is not limited to a front / rear occupant position per se. For example, the device 10 could function similarly to release inflation medium from the airbag 14 depending on the detection of the presence of a child seat installed on the vehicle seat 22. This can be detected, for example, via a seat belt tension sensor (not shown) that is operatively connected to the control unit 140. As another example, the venting belt 150 could function similarly to control the deflation of the airbag 14 in the case of a very tall occupant, regardless of the front / rear position of the seat 22, based on the detected weight on the seat. As yet another example, the venting belt 150 could function similarly to control the deflation of the airbag 14 in the case of an occupant who is not in the normal seating position, such as...in a bent or forward-leaning position, regardless of the front / rear position of the seat 22 and regardless of the size of the occupant, as determined by an occupant position sensor (e.g. an optical or ultrasonic sensor) or a belt extension sensor (not shown) that is operatively connected to the control unit 140.

[0057] A second embodiment of the present invention is described in the Fig. 4A and Fig. 4B shown. Certain components in the Fig. 4A and Fig. 4B components are similar or identical to components of the Fig. 1A to 3B. To avoid confusion, the reference numbers for these similar or identical components are shown in the Fig. 4A and Fig. 4B with the suffix “a”. The device 10a of the second embodiment has an airbag 14a which is equipped with a vent 200 which is one of those in the Fig. The vent shown in 1A-3B has 100 different shapes.

[0058] Regarding the Fig. 4A and Fig. 4B, the vent 200 of the second embodiment is actuated to release inflation medium from the airbag 14a. The vent 200 generally has a tubular shape, forming a conduit extending through a wall 114a of the airbag 14a. This design can be achieved, for example, by positioning the vent 200 through an opening 116a in the airbag wall 114a and connecting the vent to the airbag material surrounding the opening (e.g., by sewing). In this case, the opening 116a can have a shape (e.g., circular) that corresponds to the cross-sectional shape of the tubular structure of the vent 200.

[0059] The vent 200 generally has a tubular shape. In the Fig. 4A and Fig. In the embodiment shown in Figure 4B, the vent 200 comprises a tubular structure with a first cylindrical section having an inner wall 20 and a second cylindrical section with an outer wall 204. The inner and outer walls 202 and 204 share a common central axis 206. As shown in the Fig. 4A and Fig. As shown in Figure 4B, the respective floor sections 210 and 212 of the inner and outer walls 202 and 204 meet at the opening 116a in the airbag wall 114a. As shown in the Fig. 4A and Fig. As shown in Figure 4B, the inner and outer walls 202 and 204 can have congruent or substantially congruent configurations. The inner and outer walls 202 and 204 can have the same or substantially the same diameter, or alternatively, the outer wall 204 can have a smaller diameter than the inner wall 202. For this purpose, the inner and outer walls 202 and 204 can comprise sections of a single, cylindrical, tubular structure, as shown in the Fig. 4A and Fig. 4B is shown.

[0060] The inner wall 202 has a closed end section 224, which tapers downwards and is connected to the vent belt 150a. The outer wall 204 has an open end section 220, which defines an outlet 222 of the vent 200. The outer wall 204 defines a flow-through or discharge chamber 240 through which inflation medium flows directly to the outlet 222. The inner wall 202 has a closed end section 224, to which an end section 152a of a vent belt 150a is connected. The inner wall 202 has several vent openings 232 spaced around the circumference of the inner wall. In the Fig. 4A and Fig. In the embodiment illustrated in Figure 4B, the openings 232 are generally circular. However, the openings 232 could also have alternative shapes. For example, the openings could include elongated slots, X-shaped slots, cross-shaped slots, T-shaped slots, Y-shaped slots, or other openings of a suitable shape.

[0061] At an interface 242 between the bottom sections 210 and 212 of the inner and outer walls 202 and 204, respectively, the inner wall 202 is folded along a first fold 244 into the discharge chamber 240 formed by the outer wall 204 and then folded back along a second fold 246 such that the inner wall 202 extends back towards or into the inflatable volume 54a of the airbag 14a. At the interface 242, the bottom section 210 of the inner wall 202 extends along and into the bottom section of the outer wall 204. This folded / inwardly turned design simplifies the extension of the inner wall 202 into and out of the discharge chamber 240.

[0062] The vent 200 has a Fig. 4A shown, open state as well as one in Fig. 4B shows the closed state. In the open state of the Fig. 4A The venting belt 150a otherwise tensions or pulls / holds the inner wall 202 in an open state, which lies at least partially within the inflatable volume 54a of the airbag 14a. In the open state, the inner wall 202 is thus extended at least partially telescopically from the discharge chamber 240, as shown in Fig. 4A shown. In the open state, the inner wall 202 can actually be fully extended out of the discharge chamber 240 (not shown), so that the folds 244 and 246 are fully unfolded and the walls 202 and 204 have the same surface area.

[0063] In the open state, the vent strap 150a substantially or completely prevents the inner wall 202 from entering the discharge chamber 240. In the open state, the vent 200 establishes a flow connection between the inflatable volume 54a and the atmosphere surrounding the airbag 14a via the vent openings 232, the discharge chamber 240, and the outlet 222. In the open state, the vent strap 150a holds the inner wall 202 in this open state, which extends into the inflatable volume 54a against the pressure of the inflation medium in the airbag 14a.

[0064] When closed, the Fig. 4B The venting belt 150a does not otherwise tension or pull / hold the inner wall 202 in the open state, which lies within the inflatable volume 54a of the airbag 14a. The inner wall 202 can thus move freely depending on the pressure of the inflation medium within the inflatable volume 54a of the airbag 14a. Under the pressure of the inflation medium in the inflatable volume 54a, the inner wall 202 moves (i.e., shifts) into a closed state, which lies at least partially within the discharge chamber 240 defined by the outer wall 204. In the closed state, the inner wall 202 is turned inside out from the open state. In the closed state of the Fig. 4B, the inner wall 202 is actually turned inside out until it is completely displaced into the chamber 240 and fully unfolds. Since the inner wall 202 and the outer wall 204 have congruent or substantially congruent shapes, the inner wall 202, in its closed state, corresponds to, overlaps with, and follows the contour of the outer wall 204, thereby forming a press fit between the walls.

[0065] According to the present invention, the vent openings 232 are located on corresponding sections of the outer wall 204 when the vent 200 is closed. Since the inner wall 202 is closed at the end section 224, the pressure of the inflation medium in the airbag presses the sections of the inner wall 202 surrounding the vent openings 232 against the corresponding sections of the outer wall 204. Consequently, the outer wall 204 confines the inner wall 202 and prevents, or substantially prevents, the flow connection between the inflatable volume 54a and the atmosphere surrounding the airbag 14a. The release of inflation fluid is thus prevented when the vent 200 is closed.

[0066] The person skilled in the art will therefore recognize that the vent 200 releases inflation medium from the inflatable volume 54a of the airbag 14a when the vent strap 150a holds the vent, in particular the inner wall 202, in the open state ( Fig. 4A). The person skilled in the art will further recognize that the vent 200 prevents the release of inflation medium from the inflatable volume 54a of the airbag 14a when the vent belt 150a releases the vent, in particular the inner wall 202, for movement into the closed state ( Fig. 4B).

[0067] Since the displacement of the inner wall 202, which moves the vent 200 into the closed state, occurs passively depending on the pressure of the inflation medium in the inflatable volume 54a (more precisely, depending on the pressure difference between the inflatable volume 54a in the airbag 14a and the atmosphere surrounding the airbag 14a), the device 10 can be designed such that the actuation of the vent 200 depends on whether the vent strap 150a is anchored in the vehicle. A person skilled in the art will recognize that the airbag 14a can be designed such that, when the vent strap 150a is anchored, movement of the inner wall 202 during airbag deployment can ensure that the vent strap is tensioned and thereby holds the vent 200 in the open state, as described above.Similarly, the person skilled in the art will recognize that the airbag 14a may be designed such that when the venting strap 150a is released from its anchoring, the inner wall 202 is similarly released, allowing the inner wall and thus the vent 200 to move into the closed state as described above.

[0068] The vent 200 of the embodiment of the Fig. 4A-4B may be able to react to vehicle states, occupant states, or both, to control the inflation and deployment of the airbag 14a. Since the vent 200, as described above, is set to the open state depending on the anchoring of the vent strap 150a and to the closed state depending on the release of the vent strap 150a, the person skilled in the art will recognize that the control of the vent 200 is active based on detected states in the vehicle in a manner similar to or identical to that described above with respect to the vent 100 of the embodiment of the Fig. 1A-3B can be carried out.

[0069] To achieve this function, the device 10a may further comprise the control unit(s), sensor(s), lines, and all other components necessary for the active control of the venting 200 based on detected vehicle states, occupant states, or a combination of vehicle and occupant states when the event for inflation and deployment of the airbag 14a occurs. As with regard to the embodiment of the Fig. As described in 1A-3B, these detected conditions can include, for example, a detected seat position, a detected weight on the vehicle seat, the detected presence of an occupant on the vehicle seat, or a combination of these conditions. The device 10a can thus, for example, be able to react to the size or position of the vehicle occupant. Alternative sensors, such as optical or ultrasonic sensors, can also be used to detect the presence and / or position of an occupant on the seat.

[0070] Furthermore, the adaptive functionality of device 10a is not limited to a front / rear occupant position per se. For example, device 10a could function similarly to release inflation medium from the airbag depending on the detection of a child seat positioned on the vehicle seat. This could be detected, for example, via a seat belt tension sensor (not shown) that communicates with the control unit. As another example, the venting belt 150a could function similarly to control the deflation of the airbag 14a in the case of a very tall occupant, regardless of the front / rear position of the seat, based on the detected weight on the seat.As another example, the venting belt 150a could function similarly to control the venting of the airbag 14a in the event of an occupant not sitting in a normal seating position, such as a bent or forward-leaning position, regardless of the front / rear position of the seat and regardless of the size of the occupant, as determined by an occupant position sensor (e.g. an optical or ultrasonic sensor) or a belt extension sensor (not shown) that is in operative communication with the control unit.

[0071] A third embodiment, not belonging to the invention, is described in the Fig. 5A-5C illustrated. Certain components in the Fig. 5A-5C are similar to or identical to components of the Fig. 1A-3B. The reference numerals of these similar or identical components in the Fig. 5A-5C are marked with the suffix "b" to avoid confusion. The device 10b of the second embodiment has an airbag 14b equipped with a vent 300 in a shape that differs from the one in the Fig. The ventilation shown in 1A-3B differs by 100.

[0072] In relation to Fig. 5A includes a device 10b for protecting an occupant 20b of a vehicle 12b, an inflatable vehicle occupant protection device in the form of an airbag 14b. In the Fig. In the embodiment illustrated in Figures 5A-5C, the airbag 14b is a front passenger airbag for the protection of an occupant 20 of a seat 22b on a passenger side 24b of the vehicle 12b.

[0073] The airbag 14b can be part of an airbag module 30b which, with regard to construction, shape and operation, is similar or identical to the module 30 of the embodiment of the Fig. 1A-3B is. The vent 300, which differs in its shape from the one in the Fig. The difference between the embodiment shown in 1A-3B and the embodiment shown is such that it adapts in a manner similar to or identical to the embodiment of the vehicle states, occupant states or a combination of vehicle and occupant states depending on the vehicle states, occupant states or a combination of vehicle and occupant states. Fig. 1A-3B is operational. Device 10b can therefore be one of the various control units and sensors described here with regard to the embodiment of the Fig. exhibit 1A-3B.

[0074] Regarding the Fig. 5A-5C, the vent 300 of the third embodiment is actuated to release inflation medium from the inflatable volume 54b of the airbag 14b. The vent 300 comprises a first section with a first web 302 and a second section with a second web 304. The overlapping first and second webs 302 and 304 are arranged one above the other and connected to each other over their respective circumferences 306 and 308 by known means such as sewing or ultrasonic welding. The connected first and second webs 302 and 304 define a discharge chamber 320 between them. In the Fig. In the embodiment illustrated in Figures 5A-5C, tracks 302 and 304 generally have a round shape. Tracks 302 and 304 could also have alternative configurations.

[0075] The first section 302 has a central discharge opening 310 and one or more vent openings 312 spaced apart around the discharge opening. The discharge opening 310 is positioned adjacent to a wall 114b of the airbag 14b, aligned with an opening 314 in the airbag wall 114b. A circumferential section of the first section 302 surrounding the discharge opening 310 is connected to a circumferential section 318 of the airbag wall 114b surrounding the discharge opening 314 by known means, such as sewing or ultrasonic welding.

[0076] The second track 304 extends through and covers the discharge opening 314, the vent openings 312 and the discharge opening 314. The vent belt 150b has a first end section connected to the actuating device 160b and a second end section connected to a central section of the second track 304.

[0077] The vent 300 is in an open state, as shown in Fig. 5B is shown, and a closed state, as in Fig. 5C is shown, on. In the open state of the Fig. 5B The venting belt 150b tensions or otherwise pulls / holds the second web 304 in an open state in which the second web is spaced apart from the first web 302, thereby widening the discharge chamber 320. When the venting belt 150b tensions the second web 304, the tension in the center of the web is distributed or transferred to the circumference of the web along the junction with the first web 302. As a result, the second web 304, as shown in Fig. Figure 5C shows a concave shape that faces away from the inflatable volume 54b in the direction of the discharge openings 310 and 314. The first path 302 also assumes a concave shape, but points into the inflatable volume 54b. The discharge chamber 320 is formed between these concavely opposing paths 302 and 304.

[0078] In the open state, the vent 300 ensures a flow connection between the inflatable volume 54b and the atmosphere surrounding the airbag 14b via the vent openings 312, the discharge chamber 320, and the discharge openings 310 and 314. In the open state, the vent belt 150b holds the first panel 302 and the second panel 304 in the spaced-apart, mutually concave positions as shown in Fig. 5B is shown.

[0079] When closed, the Fig. 5C tensions or pulls / holds the ventilation belt 150b otherwise the first and second webs 302 and 304 in the spaced, concavely opposite state, as in Fig. Figure 5B illustrates this. The first and second layers 302 and 304 can thus move freely depending on the pressure of the inflation medium in the inflatable volume 54b of the airbag 14b. Under the pressure of the inflation medium in the inflatable volume 54, the second layer 304 moves into a closed state, in which it is pressed flat against the first layer 302. In this closed state, the second layer 304 covers the vent openings 312 and discharge openings 310 and 314. In this closed state, the discharge chamber 320 collapses and its volume is effectively reduced to zero. Consequently, the second layer 304 completely or substantially blocks the flow connection between the inflatable volume 54 and the atmosphere surrounding the airbag 14b. Thus, the release of inflation medium is blocked when the vent 300 is closed.Advantageously, the pressure of the inflation medium in the inflatable volume 54b presses the second layer 304 against the first layer 302 and holds the first layer firmly between the second layer and the airbag layer 114b.

[0080] The person skilled in the art will therefore recognize that the vent 300 releases inflation medium from the inflatable volume 54b of the airbag 14b when the vent belt 150b holds the vent, in particular the second web 304, in the open state ( Fig. 5B). The person skilled in the art will further recognize that the vent 300 prevents the release of inflation medium from the inflatable volume 54b of the airbag 14b when the vent belt 150b releases the vent, in particular the second web 304, for movement into the closed state ( Fig. 5C).

[0081] Since the displacement of the first and second sections 302 and 304, which closes the vent 300, occurs passively depending on the pressure of the inflation medium in the inflatable volume 54b (more precisely, depending on the pressure difference between the inflatable volume 54b inside the airbag 14b and the atmosphere surrounding the airbag 14b), the device 10b can be designed such that the actuation of the vent 300 depends on whether the vent strap 150b is anchored in the vehicle 22b. Those skilled in the art will recognize that the airbag 14b can be designed such that, when the vent strap 150b is anchored, a displacement of the first and second sections 302 and 304 during airbag deployment can ensure that the vent strap is tensioned and thereby holds the vent 300 in the open state, as described above.Similarly, the person skilled in the art will recognize that the airbag 14b can be designed such that when the venting belt 150b is released from its anchoring, the first and second webs 302 and 304 are similarly released, allowing the webs, and thus the vent 300, to move into the closed state as described above.

[0082] The vent 300 of the embodiment of the Fig. 5A-5C may be able to react to vehicle states, occupant states, or both, to control the inflation and deployment of the airbag 14b. Since the vent 300, as described above, is set to the open state depending on the anchoring of the vent strap 150b and to the closed state depending on the release of the vent strap 150b, the person skilled in the art will recognize that active control of the vent 300 based on detected states in the vehicle 12b is comparable to the embodiment described above with respect to the vent 100. Fig. 1A-3B can be carried out in a similar or identical manner.

[0083] To achieve this function, the device 10b may also include the control unit(s), sensor(s), lines, and all other components necessary for the active control of the vent 300 based on detected vehicle states, occupant states, or a combination of vehicle and occupant states when the event occurs for which inflation and deployment of the airbag 14b is desired. As with regard to the embodiment of the Fig.As described in 1A-3B, these detected states can include, for example, a detected seat position, a detected weight on the vehicle seat, the detected presence of an occupant on the vehicle seat, or a combination of these states. Device 10b can thus, for example, be able to react to the size or position of the vehicle occupant. Alternative sensors, such as optical or ultrasonic sensors, can also be used to detect the presence and / or position of an occupant on the seat.

[0084] Furthermore, the adaptive functionality of device 10b is not limited to a front / rear occupant position per se. Device 10b could, for example, function similarly to release inflation medium from the airbag depending on the detection of a child seat installed on the vehicle seat. This can be detected, for example, via a seat belt tension sensor (not shown) that is operatively connected to the control unit. As another example, the venting belt 150b could function similarly to control the deflation of the airbag 14b in the case of a very tall occupant, regardless of the front / rear position of the seat, based on the detected weight on the seat.As another example, the venting belt 150b could function similarly to control the venting of the airbags 14b in the event of an occupant not sitting in a normal seating position, such as in a bent or forward-leaning position, regardless of the front / rear position of the seat and regardless of the size of the occupant, as determined by an occupant position sensor (e.g. an optical or ultrasonic sensor) or a belt tension sensor (not shown) that is operatively connected to the control unit.

[0085] From the foregoing description of the invention, those skilled in the art will deduce improvements, modifications, and variations. Although the embodiments disclosed herein are shown in applications on the passenger side of the vehicle, those skilled in the art will recognize, for example, that the present invention is intended for and can be applied to either the driver's side or the passenger side of the vehicle. When used on the driver's side, the device would simply be attached to the vehicle's steering wheel rather than to the dashboard. While in this case the overall shape of a steering wheel-mounted airbag may differ from that of a dashboard-mounted airbag, the basic function of the adaptive restraint belt and the venting mechanism would be nearly identical. Furthermore, more than one venting / restraint belt combination can be used in the airbag configurations of all embodiments disclosed herein.The foregoing and further such improvements, changes and modifications within the scope of professional competence shall be covered by the accompanying claims.

Claims

[1] A device for protecting an occupant of a vehicle, comprising an inflatable vehicle occupant protection device (14) having a panel (114) which at least partially defines an inflatable volume (54) of the vehicle occupant protection device (14); and a vent (100), characterized byin that the vent (100) comprises a sidewall extending through the web (114) and defining a passageway (134) for discharging inflation medium from the inflatable volume (54), the vent (100) comprising a first portion (102) extendable into the inflatable volume (54) and an opposing second portion (104) extending outside the inflatable volume (54); the vent (100) having an open state in which the first portion (102) is retained within the inflatable volume (54) and thereby permits discharge of inflation medium through the passageway (134), and the vent (100) having a closed state in which the first portion (102) is inverted and disposed within the second portion (104) to prevent outflow of inflation medium through the passageway (134). [2] The device of claim 1, further comprising a tether (150) having a first end portion (152) connected to the first section (102) of the vent (100) and a second end portion (154) releasably anchored to the device (10), wherein the tether (150) is releasable to place the vent (100) in the closed state, and wherein the tether (150) in the anchored state holds the vent (100) in the open state. [3] The device according to claim 1 or 2, wherein the side wall comprises an annular or cylindrical tube, and wherein the second portion (104) of the vent (100) has a diameter that is smaller than a diameter of the first portion (102) of the vent (100). [4] The device according to at least one of claims 1 to 3, wherein the first portion (102) of the side wall has a first bottom portion (110) disposed adjacent to the track (114), the first portion (102) having a conical shape extending from the first bottom portion (110) into the inflatable volume, the second portion (104) of the side wall having a second bottom portion (112) disposed adjacent to the track (114) and having a conical shape extending outwardly and away from the inflatable volume in a venting (100) state; and a conical side wall of the first portion (102) corresponds to a conical side wall of the second portion (104) when the venting (100) is in the closed state; [5] The device according to at least one of claims 1 to 4, wherein the sidewall has a generally tubular construction and a cross-sectional shape corresponding to an opening in the web (114) through which the sidewall extends; wherein the sidewall is connected to a portion (102) of the web (114) extending around the perimeter of the opening, and / or wherein the second portion (104) of the vent (100) has a cross-sectional area that is smaller than a cross-sectional area of ​​the first portion (102) of the vent (100). [6] The device according to at least one of claims 1 to 5, wherein the first portion (102) of the vent (100) has vent openings (132) extending through the side wall, and wherein the first and second portions (102, 104) are configured such that the first portion (102), when inverted and disposed in the portion of the passage (134) defined by the second portion (104), corresponds to and is bounded by the second portion (104), causing the side wall of the first portion (102) to be pressed against the side wall of the second portion (104) by the pressure of the inflation medium in the inflatable volume, thereby forming a seal between the first and second portions (102, 104) to prevent outflow of inflation fluid through the vent openings (132), wherein the first portion (102) is designed sothat the vent openings (132) are positioned on an inner wall of the second portion (104) of the vent (100) when the vent (100) is in the closed state., [7] The apparatus of claim 6, wherein the vent openings (132) are configured to establish fluid communication between the inflatable volume of the inflatable vehicle occupant protection device (14) and the passageway (134) when the vent (100) is in the open state, such that inflation fluid can flow through the openings (132) and through the passageway (134) to discharge inflation fluid from the inflatable vehicle occupant protection device (14). [8] Device according to at least one of claims 1 to 7, wherein the first portion (102) is designed such that the pressure of the inflation medium in the inflatable volume acts on the first portion (102) to ensure that the first portion (102) is everted and positioned in the second portion (104), wherein the first portion (102) of the vent (100) has a closed end (124) and is designed such that the pressure of the inflation medium in the inflatable volume can act on the closed end (124) of the first portion (102) to ensure that the first portion (102) is everted and positioned in the second portion (104). [9] Device for protecting an occupant of a vehicle, comprising an inflatable vehicle occupant protection device (14a) and a vent (200), characterized byin that the vent (200) comprises a first and a second tubular section (202, 204), wherein the second tubular section (204) extends outside the inflatable vehicle occupant protection device (14a); wherein the vent (200) has an open state in which the first tubular section (202) extends inside the inflatable vehicle occupant protection device (14a) and thereby enables the release of inflation medium through the vent (200), and wherein the vent (200) has a closed state in which the first tubular section (202) is everted and extends at least partially into the second tubular section (204), wherein the second tubular section (204) prevents inflation medium from being released through the vent (200). [10] Device for protecting an occupant of a vehicle, comprising: an inflatable vehicle occupant protection device (14a); a vent (200) for discharging inflation medium from the inflatable vehicle occupant protection device (14a), characterized by that the vent (200) comprises a line with a first section (202) extending into the inflatable vehicle occupant protection device (14a) and a second portion (204) extending outside the inflatable vehicle occupant protection device (14a); and a tether (150a) having a first end portion (152a) connected to the first portion (202) of the vent (200) and a second end portion releasably anchored to the device (10a); wherein the vent (200) has an open state in which the tether (150a) is anchored and thereby maintaining the first portion (202) positioned within the inflatable vehicle occupant protection device (14a) such that inflation medium can exit through the conduit; and wherein the vent (200) has a closed condition in which the tether (150a) is released and thereby allows the first portion (202) to be inverted and positioned within the second portion (204), thereby preventing inflation medium from being released from the conduit. [11] The apparatus of claim 9 or 10, wherein the first portion (202) of the conduit has a closed end (224) and vent openings (232) extending through a sidewall of the conduit, and wherein the vent openings (232) establish fluid communication between the inflatable vehicle occupant protection device (14a) and the conduit when the vent (200) is in the open state, thereby allowing flow of inflation medium through the vent openings (232) and through the conduit to vent inflation fluid from the inflatable vehicle occupant protection device (14a). [12] The device according to at least one of claims 9 to 11, wherein the first portion (202) is configured such that the vent openings (232) are positioned on an inner wall of the second portion (204) of the conduit when the vent (200) is in the closed state, and wherein the first portion (202) is configured such that pressure of the inflation medium in the inflatable vehicle occupant protection device (14a) acts on the first portion (202) to cause the first portion (202) to be inverted and positioned in the second portion (204). [13] Device according to at least one of claims 9 to 12, wherein the inflatable vehicle occupant protection device (14a) comprises a web (114a) which at least partially defines an inflatable volume of the inflatable vehicle occupant protection device (14a), wherein the first and second tubular sections (202, 204) have further sections (210, 212) with a tubular structure which extends through an opening (116a) in the web (114a) and is connected to regions of the web (114a) surrounding the opening (116a), wherein the first tubular section (202) is designed such that the pressure of the inflation medium in the inflatable vehicle occupant protection device (14a) acts on the first tubular section (202) to ensure that the first tubular section (202) is inverted and in the second tubular section (204) is positioned.

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