GB2519449A - Pre-tensioning device for a seat belt of a vehicle, in particular a motor vehicle - Google Patents
Pre-tensioning device for a seat belt of a vehicle, in particular a motor vehicle Download PDFInfo
- Publication number
- GB2519449A GB2519449A GB1421592.5A GB201421592A GB2519449A GB 2519449 A GB2519449 A GB 2519449A GB 201421592 A GB201421592 A GB 201421592A GB 2519449 A GB2519449 A GB 2519449A
- Authority
- GB
- United Kingdom
- Prior art keywords
- airbag
- tensioning device
- belt
- seat belt
- vehicle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 230000003247 decreasing effect Effects 0.000 claims abstract description 4
- 239000004744 fabric Substances 0.000 description 7
- 241001274197 Scatophagus argus Species 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
- B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
- B60R21/18—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags the inflatable member formed as a belt or harness or combined with a belt or harness arrangement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
- B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
- B60R21/23—Inflatable members
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
- B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
- B60R21/23—Inflatable members
- B60R21/231—Inflatable members characterised by their shape, construction or spatial configuration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R22/00—Safety belts or body harnesses in vehicles
- B60R22/18—Anchoring devices
- B60R22/195—Anchoring devices with means to tension the belt in an emergency, e.g. means of the through-anchor or splitted reel type
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R22/00—Safety belts or body harnesses in vehicles
- B60R22/18—Anchoring devices
- B60R22/195—Anchoring devices with means to tension the belt in an emergency, e.g. means of the through-anchor or splitted reel type
- B60R22/1954—Anchoring devices with means to tension the belt in an emergency, e.g. means of the through-anchor or splitted reel type characterised by fluid actuators, e.g. pyrotechnic gas generators
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R22/00—Safety belts or body harnesses in vehicles
- B60R22/18—Anchoring devices
- B60R22/22—Anchoring devices secured to the vehicle floor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
- B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
- B60R21/23—Inflatable members
- B60R21/231—Inflatable members characterised by their shape, construction or spatial configuration
- B60R21/2334—Expansion control features
- B60R21/2338—Tethers
- B60R2021/23382—Internal tether means
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Air Bags (AREA)
Abstract
Pre-tensioning device 38 for a vehicle seat belt (24, figure 2) comprising at least one inflatable air bag 40 attached to a lap belt 30 of the seat belt, and at least one gas generator 48 for inflating the airbag, thereby pre-tensioning the lap belt. Preferably the airbag is inflated in a direction extending perpendicularly to the longitudinal extension of the lap belt (see figure 7), thus decreasing the length of the pre-tensioning device, which corresponds to the length d of the longitudinal extension of the lap belt (see figure 5); at least one cavity 60 bounds the airbag and inflates it with a medium; the pre-tensioning device comprises at least one tether (62, figure 7) arranged in the cavity and attached to the airbag.
Description
Pro-tensioning Device for a Seat Belt of a Vehicle, in particular a Motor Vehicle The invention relates to a pre-tensioning device for a seat belt of a vehicle, in particular a motor vehicle.
Seat belts for vehicles are well-known from the general prior art. Such a seat belt is a restraint system configured to restrain at least one occupant of the vehicle in the case of an accident, in particular a frontal impact. Usually, the seat belt is equipped with a pre-tensioning device which is also referred to as a pre-tensioner. The pre-tensioner is configured to pre-tension at least a part of the seat belt when an accident is detected by means of at least one sensor of the vehicle or when an accident is estimated to happen in the near future by a control unit. In such a case, the pre-tensioner is activated by the control unit so as to pre-tension the seat belt before the accident actually happens thereby avoiding slack in the seat belt.
US 2014/0061 352 Al shows an anchor pre-tensioner for a seat belt of a vehicle, the anchor pre-tensioner comprising a first wire and a second wire connected to a lower end of a webbing of the seat belt, respectively. The anchor pre-tensioner further comprises a driving cylinder having a piston coupled to respective ends of the first and the second wires. Furthermore, the anchor pre-tensioner comprises a gas generator supplying a gas pressure for the forward movement of the piston. A first roller is provided, the first roller supporting the first wire to move in the direction oblique with respect to a bottom of the vehicle when the piston moves forward. Moreover a second roller is provided which second roller supports the second wire to move in a downward direction as the piston moves forward. The forward movement of the piston during a vehicle collision pulls the webbing of the seat belt in a direction where the first wire moves and at the same time in a direction perpendicular thereto.
It is an object of the present invention to provide a pre-tensioning device for a seat belt, by means of which pre-tensioning device at least one occupant can be restrained in a particularly advantageous way.
This object is solved by a pre-tensioning device having the features of patent claim 1.
Advantageous embodiments with expedient developments of the invention are indicated in the other patent claims.
According to the present invention the pre-tensioning device for a seat belt of a vehicle comprises at least one inflatable airbag configured to be attached to a lap belt of the seat bolt. For example, the inflatable airbag is configured to be attached to at least one connection point so as to fix the lap belt to the connection point via the airbag. The pre-tensioning device according to the present invention further comprises at least one gas generator configured to inflate the airbag thereby pre-tensioning the lap belt. By pre-tensioning the lap belt by means of the airbag the risk of submarining can be kept particularly low. The term "submarining" refers to a movement of an occupant during an accident of the vehicle, in particular a frontal impact, wherein the occupant dives deeply into a seat cushion of a seat and, thus, slips through the lap belt and the seat cushion.
The risk of such a movement can be kept particularly low by means of the pre-tensioning device according to the present invention so that the occupant can be restrained particularly advantageously by means of the pre-tensioning device.
Preferably, the airbag is configured to be inflated in the direction extending perpendicularly to the longitudinal extension of the lap belt so that, for example, by inflating the airbag its length is decreased, said length corresponding to the longitudinal extension of the lap belt.
Said lap belt is a strap which goes over the waist of the occupant when the occupant fastened the seat belt. Preferably, the seat belt is configured as a three-point seat belt having the lap belt and a shoulder harness which is also referred to as a sash or a shoulder strap. Said sash or shoulder harness is a strap that goes diagonally over the occupant's outboard shoulder when the scat belt is fastened. For example, the shoulder harness and the lap belt are formed in one piece. For example, the shoulder harness and the lap belt are formed by a webbing of the seat belt. Thus, a Y-shaped arrangement of the three-point seat belt is formed by means of which arrangement the waist as well as the upper body of the occupant can be restrained during an accident, in particular a frontal impact.
Further advantages, features, and details of the invention derive from the following description of a preferred embodiment as well as from the drawing. The features and feature combinations previously mentioned in the description as well as the features and feature combinations mentioned in the following description of the figures and/or shown in the figures alone can be employed not only in the respective indicated combination but also in any other combination or taken alone without leaving the scope of the invention.
The drawing shows in: Fig. la a schematic side view of a seat of a vehicle, an occupant sitting in the seat, and a seat belt before a frontal impact; Fig. lb a schematic side view of the occupant, the seat, and the seat belt during the frontal impact; Fig. 2 part of a schematic side view of the seat and the seat belt, the seat belt being equipped with a pre-tensioning device configured to pre-tension the seat belt; Fig. 3 a schematic sectional view of the pre-tensioning device comprising at least one inflatable airbag configured to be attached to a lap belt of the seat belt, and at least one gas generator configured to inflate the airbag thereby pre-tensioning the lap belt; Fig. 4 part of a schematic sectional view of the pre-tensioning device; Fig. 5 two schematic sectional views of the inflatable airbag; Fig. 6 a schematic perspective view of the inflatable airbag; and Fig. 7 a schematic and perspective sectional view of the inflatable airbag.
In the figures the same elements or elements having the same functions are indicated by the same reference signs.
Fig. 1 a shows part of an interior 10 of a vehicle in the form of a motor vehicle which is, for example, a passenger vehicle. The vehicle comprises two seats 12 and 14, wherein, for example, the seat 12 is a front seat and the seat 14 is a rear seat. The seats 12 and 14 are attached to a floor 16 of the vehicle. Fig. 1 a further shows an occupant 18 sitting in the seat 14. As can be seen from Fig. 1 a, the seat 14 comprises a seat cushion 20 and a back rest 22.
The vehicle further comprises a restraint system in the form of a seat belt 24 assigned to the seat 14, wherein the seat belt 24 is configured as a three-point seat belt. The seat belt 24 comprises a webbing 26 which forms a shoulder harness 28 and a lap belt 30 of the seat belt 24. The webbing 26 is connected to a belt tongue which is not shown in Fig. 1 a.
When the seat belt 24 is fastened the bolt tongue is connected to a belt buckle in a first connection area which is not shown in Fig. 1 a. Moreover, the webbing 26 is fixed to the structure of the vehicle in a second connection area 32 and a third connection area not shown in Fig. 1 a. Said connection areas are arranged at respective distances from each other and form respective connection points at which the seat belt 24 is fixed to the structure of the vehicle thereby forming a three-point seat belt. As can be seen from Fig. la, the lap belt 30 has two end portions 34 which are connected to anchors 36 respectively. Thus, the lap belt 30 is connected to the structure of the vehicle by the anchors 36 in the second connection area 32. The seat belt 24 comprises a retractor 27 via which the webbing 26, in particular the shoulder harness 28 is attached to the structure in an upper connection area.
Fig. la shows the occupant 18 and, thus, the seat belt 24 before an accident in form of a frontal impact. Fig. lb shows the occupant 18 and the seat belt 24 during said frontal impact. As can be seen from Fig. ib, the seat belt 24 serves to restrain the occupant 18, wherein the shoulder harness 28 is configured to restrain the upper body and the lap belt is configured to restrain the waist of the occupant 18.
In order to restrain the occupant 18 particularly advantageously the seat belt 24 is equipped with a pre-tensioning device 38. The pre-tensioning device 38 comprises at least one inflatable airbag 40 which can be seen particularly well from Fig. 2 and 3. The inflatable airbag 40 is attached to the lap belt 30 of the seat belt 24. As can be seen from Fig. 3, the lap belt 30 comprises at least three webbing elements 42, 44 and 46. The inflatable airbag 40 is connected to the webbing element 42 on one side and the webbing elements 44 and 46 on the other side, wherein the webbing elements 46 are connected to said anchors 36. Thus, the lap belt 30 is attached to the anchors 36 and fixed to the structure via the inflatable airbag 40.
The pre-tensioning device 38 further comprises at least one gas generator 48 which is fluidically connected to the inflatable airbag 40. The gas generator 48 is configured to inflate the airbag thereby pre-tensioning the lap belt 30. Thus, the risk of submarining can be kept particularly low so that the occupant 18 can be restrained particularly advantageously.
As can be seen from Figs. 2 and 3 the gas generator 48 is fluidically connected to the airbag 40 by at least one duct element 50 via which a medium, in particular a gas, provided by the gas generator 48 can be guided from the gas generator 48 to and inside the airbag 40. As can be seen from Fig. 4, the airbag 40 comprises a top layer 52 and a bottom layer 54 which are made of a belt fabric, for example. The layers 52 and 54 are connected with each other by stitchings 56. Moreover, the airbag 40 comprises a fabric 58 via which the layers 52 and 54 are connected with each other. The layers 52 and 54 and the airbag fabric 58 form at least one cavity 60 configured to be filled with the medium provided by the gas generator 48 thereby inflating the airbag 40. Figs. 4 and 5 show the airbag 40 in an initial condition I in which the airbag 40 is not inflated. For example, the airbag 40 is in the initial condition I before the frontal impact. Thus, the airbag fabric 58 is folded.
Moreover, the pre-tensioning device 38 comprises at least one strap or tether 62 arranged in the cavity 60 and attached to an inner side 64 of the airbag fabric 58. Figs. 5 to 7 show the airbag 40 in an inflated condition C in which the airbag 40 is inflated. For example, at least one sensor of the vehicle monitors at least one parameter indicative of a frontal impact. Said parameter is transmitted to an electronic control unit which receives the parameter monitored or detected by the sensor. The electronic control unit calculates the risk of a frontal impact on the basis of said parameter. When the calculated risk exceeds a predetermined threshold value the pre-tensioning device 38, i.e. the gas generator 48 is activated by the electronic control unit so that the lap belt 30 is pre-tensioned before the frontal impact actually happens. By activating the gas generator 48 the airbag 40 is inflated, wherein the internal strap or tether 62 serves to realize a predetermined movement and final shape of the airbag 40 in its inflated condition C. In the inflated condition C the cavity 60 is filled with the gas provided by the gas generator 48. As can be seen from Fig. 7, the tether 62 is a lateral tether extending perpendicularly to the longitudinal extension of the lap belt 30.
The airbag 40 is configured to be inflated in a direction extending perpendicularly to the longitudinal extension of the lap belt 30 so that by inflating the airbag 40 its length is decreased, said length corresponding to the longitudinal extension of the lap belt 30.
Fig. 5 shows a distance d by which the lap belt 30 is pulled and, thus, tensioned by inflating the airbag 40 so that a slack of the webbing 26, in particular lap belt 30 is removable. Moreover, the occupant 18 is restrained thereby minimizing movements of the occupant 18. In Fig. 2, a distance a between the occupant 18 and the back rest 22 is illustrated, wherein said distance a can be kept particularly low by means of the pre-tensioning device 38.
By inflating the airbag 40 the airbag fabric 58 unfolds and the layers 52 and 54 move away from each other so that the stitchings 56 break. Since the webbing 26 is connected to the structure by the end portions 34 formed by the webbing elements 44 and 46 the seat belt 22 has a split design in the region of the anchors 36, wherein the airbag 40 is an internal pulling element for pre-tensioning the lap belt 30.
List of reference signs interior 12 seat 14 seat 16 floor 18 occupant seat cushion 22 back rest 24 seat belt 26 webbing 28 shoulder harness lap belt 32 connection area 34 end portion 36 anchor 38 pre-tensioning device airbag 42 webbing element 44 webbing element 46 webbing element 48 gas generator duct element 52 top layer 54 bottom layer 56 stitching 58 airbag fabric cavity 62 tether 64 inner side a distance d distance C inflated condition initial condition
Claims (5)
- Claims A pre-tensioning device (38) for a seat belt (24) of a vehicle, the pre-tensioning device (38) comprising: -at least one inflatable airbag (40) configured to be attached to a lap belt (30) of the seat belt (24); and -at least one gas generator (48) configured to inf late the airbag (40) thereby pre-tensioning the lap belt (30).
- 2. The pre-tensioning device (38) according to claim 1, characterized in that the airbag (40) is configured to be inflated in a direction extending perpendicularly to the longitudinal extension of the lap belt (30).
- 3. The pre-tensioning device (38) according to any one of claims 1 or 2, characterized in that by inflating the airbag (40) its length is decreased, the length corresponding to the longitudinal extension of the lap belt (30).
- 4. The pre-tensioning device (38) cording to any one of the preceding claims, characterized in that the airbag (40) bounds at least one cavity (80) configured to be filled with a medium thereby inflating the airbag (40), wherein the pre-tensioning device (38) comprises at least one tether (82) arranged in the cavity (80) and attached to the airbag (40).
- 5. A seat belt (24) for a vehicle, the seat belt (24) comprising a lap belt (30) and at least one pre-tensioning device (38) according to any one of the preceding claims.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1421592.5A GB2519449A (en) | 2014-12-04 | 2014-12-04 | Pre-tensioning device for a seat belt of a vehicle, in particular a motor vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1421592.5A GB2519449A (en) | 2014-12-04 | 2014-12-04 | Pre-tensioning device for a seat belt of a vehicle, in particular a motor vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB201421592D0 GB201421592D0 (en) | 2015-01-21 |
| GB2519449A true GB2519449A (en) | 2015-04-22 |
Family
ID=52425459
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1421592.5A Withdrawn GB2519449A (en) | 2014-12-04 | 2014-12-04 | Pre-tensioning device for a seat belt of a vehicle, in particular a motor vehicle |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2519449A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108275108A (en) * | 2018-02-05 | 2018-07-13 | 安徽江淮汽车集团股份有限公司 | The ventilating control method and automobile of safety belt assembly, air bag with air bag |
| US11292425B2 (en) * | 2019-11-19 | 2022-04-05 | Schroth Safety Products Llc | Safety device |
| CN114650935A (en) * | 2019-12-06 | 2022-06-21 | 奥托立夫开发公司 | Occupant restraint device |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997006983A1 (en) * | 1995-08-16 | 1997-02-27 | Simula Inc. | Inflatable tubular restraint system |
| DE29923646U1 (en) * | 1999-09-14 | 2001-02-08 | Autoliv Development AB, Vårgårda | Seat belt arrangement with belt tensioner and gas bag integrated in the belt |
| EP1950103A1 (en) * | 2005-11-16 | 2008-07-30 | Takata Corporation | Air belt device |
| JP2008296722A (en) * | 2007-05-31 | 2008-12-11 | Toyoda Gosei Co Ltd | Occupant protection device |
| US20090066064A1 (en) * | 2007-09-10 | 2009-03-12 | Yoshiki Murakami | Child Seat Installation Structure With Seat Belt Having Expandable Portion |
| US20120038137A1 (en) * | 2010-08-16 | 2012-02-16 | Tk Holdings Inc. | Occupant safety system |
| US8851511B1 (en) * | 2013-06-03 | 2014-10-07 | Key Safety Systems, Inc. | Shaped airbag |
-
2014
- 2014-12-04 GB GB1421592.5A patent/GB2519449A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997006983A1 (en) * | 1995-08-16 | 1997-02-27 | Simula Inc. | Inflatable tubular restraint system |
| DE29923646U1 (en) * | 1999-09-14 | 2001-02-08 | Autoliv Development AB, Vårgårda | Seat belt arrangement with belt tensioner and gas bag integrated in the belt |
| EP1950103A1 (en) * | 2005-11-16 | 2008-07-30 | Takata Corporation | Air belt device |
| JP2008296722A (en) * | 2007-05-31 | 2008-12-11 | Toyoda Gosei Co Ltd | Occupant protection device |
| US20090066064A1 (en) * | 2007-09-10 | 2009-03-12 | Yoshiki Murakami | Child Seat Installation Structure With Seat Belt Having Expandable Portion |
| US20120038137A1 (en) * | 2010-08-16 | 2012-02-16 | Tk Holdings Inc. | Occupant safety system |
| US8851511B1 (en) * | 2013-06-03 | 2014-10-07 | Key Safety Systems, Inc. | Shaped airbag |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108275108A (en) * | 2018-02-05 | 2018-07-13 | 安徽江淮汽车集团股份有限公司 | The ventilating control method and automobile of safety belt assembly, air bag with air bag |
| CN108275108B (en) * | 2018-02-05 | 2019-11-26 | 安徽江淮汽车集团股份有限公司 | The ventilating control method and automobile of safety belt assembly, air bag with air bag |
| US11292425B2 (en) * | 2019-11-19 | 2022-04-05 | Schroth Safety Products Llc | Safety device |
| CN114650935A (en) * | 2019-12-06 | 2022-06-21 | 奥托立夫开发公司 | Occupant restraint device |
| CN114650935B (en) * | 2019-12-06 | 2024-04-26 | 奥托立夫开发公司 | Occupant restraint device |
| US12109924B2 (en) | 2019-12-06 | 2024-10-08 | Autoliv Development Ab | Occupant restraint device |
Also Published As
| Publication number | Publication date |
|---|---|
| GB201421592D0 (en) | 2015-01-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |