Vehicle seat including a safety device
The vehicle seat's safety device with dual cable movement prevents submarining by anchoring the seat belt on the thighs, addressing the ineffectiveness of existing belts in inclined positions.
Patent Information
- Application Number
- FR2020005292
- Authority / Receiving Office
- FR · FR
- Patent Type
- Patents
- Current Assignee / Owner
- Filing Date
- 2020-05-20
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2040-05-20
AI Technical Summary
Existing vehicle seat belts are ineffective in preventing submarining when the backrest is in an inclined position, leading to potential abdominal injuries during an impact.
A vehicle seat with a safety device featuring two cables and anchor points that move the seat belt's ventral strand sequentially forward and downward upon impact, preventing submarining by maintaining the belt against the thighs.
The solution effectively prevents submarining by ensuring the seat belt remains anchored on the thighs, reducing the risk of abdominal injuries even when the backrest is inclined.
Smart Images
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Abstract
Description
Title of the invention: Vehicle seat comprising a safety device
[0001] The present invention relates to a vehicle seat comprising a safety device.
[0002] A vehicle such as a car includes, in a known manner, a plurality of seats for accommodating occupants. The seats include at least a backrest and a seat cushion.
[0003] Most of the said seats are equipped with seat belts.
[0004] The seat belt generally comprises a thoracic strand and a ventral strand.
[0005] The thoracic strand extends diagonally along the occupant's torso when the belt is fastened.
[0006] The ventral strand extends substantially perpendicularly to the legs of the occupant seated on the seat and above his thighs.
[0007] The seat belt is attached to a belt buckle fixed to the seat or to the floor of the vehicle.
[0008] In the event of an impact of the vehicle with an obstacle, the seat belt must make it possible to keep the occupant against the seat and to limit as much as possible his forward projection in order to prevent the occupant's head from hitting the dashboard, the windshield or the seat in front of him for example.
[0009] To achieve this, it is known to provide a pretensioner connected to the belt buckle by means of a cable in order to ensure that the occupant is held against the seat.
[0010] When an impact force greater than a predetermined force is applied to the vehicle and detected by an accelerometer or shock detector, the pretensioner is triggered and the cable pulls the belt buckle in a general downward movement, thus pressing the lap strand of the seat belt against the occupant's thighs.
[0011] However, if the occupant's seat back is in an inclined position, there is a risk of submarining, despite the presence of the pretensioner. Submarining refers to the occupant of a seat sliding under the lap belt during a collision with the vehicle, which reduces the effectiveness of the seat belt. The belt then presses against the occupant's abdomen. This phenomenon can cause serious abdominal injuries.
[0012] With a view to improving occupant safety, there is a need for a more efficient safety device in terms of protecting occupants in the event of an accident.
[0013] To this end, the present invention relates to a vehicle seat comprising a seat extending mainly in a longitudinal direction and perpendicular to a direction of elevation, a backrest, at least one seat belt receiving loop on a first lateral side of the seat and an attachment of the end of a lap belt strand on a second lateral side of the seat opposite the first lateral side, the seat comprising at least one safety device on the first and / or the second lateral side of the seat, each safety device comprising a first cable connecting the loop or the attachment of the end of the lap strand to a first anchor point, wherein a pull on the first cable of the respective safety device results in a general downward movement of the loop and / or the attachment of the end of the lap strand of the seat,
[0014] characterized in that each safety device comprises at least a second cable connecting the loop or attachment of the ventral strand end to a second anchor point distinct from the first anchor point, and in that a pull on the second cable of the respective safety device results in a general movement of the loop or attachment of the ventral strand end eliminating the risk of submarining.
[0015] When the seat back is in the reclined position, the buckle can move first forward via the first anchor point of the seat belt buckle and the first cable, pulling the seat belt forward, and then downward via the second anchor point of the seat belt buckle and the second cable. This sequential movement pulls the lap belt towards the occupant's thighs, thus preventing them from slipping under the lap belt and suffering serious abdominal injury.
[0016] The risk of submarining when the backrest is in an inclined position is thus eliminated.
[0017] According to particular embodiments of the invention, the seat may comprise the following features, taken alone or in any technically feasible combination:
[0018] - pulling on the second cable of the respective safety device results in a general movement of the loop or fastening of the end of the ventral strand towards the front of the seat;
[0019] - for each safety device, the second anchor point is placed at a higher height along the direction of elevation and in front of the seat along the longitudinal direction relative to the first anchor point, the second cable extending to a height greater than the height of the first cable along the direction of elevation;
[0020] - the first cable and the second cable of the respective safety device are connected to the loop or the attachment of the end of the ventral strand by a pivot joint;
[0021] - the backrest is mobile in rotation relative to the seat around the axis between a raised position in which the seat is suitable for receiving an occupant seated in an upright position, and at least one inclined position, in which the seat is suitable for receiving an occupant in a semi-reclined or reclined position, and, when the backrest is in the raised position, the loop and / or the fastening of the end of the ventral strand moves by pulling on the first cable of the respective safety device from a rest position under normal conditions of vehicle use, to an impact position when an impact force greater than a predetermined force is applied to the vehicle, the impact position being at a lower height taken along the direction of elevation than the height of the rest position;
[0022] - the backrest is mobile in rotation relative to the seat around the axis between a an upright position in which the seat is suitable for an occupant seated in an upright position, and at least one reclined position in which the seat is suitable for an occupant in a semi-reclined or reclined position, and, when the backrest is in the reclined position, the loop and / or the fastening of the end of the ventral strand moves by pulling on the second cable of the respective safety device from a rest position under normal conditions of vehicle use, to a first impact position when an impact force greater than a predetermined force is applied to the vehicle, the first impact position being at a distance from a front edge of the seat less than the distance between the rest position and the front edge of the seat, and then by pulling on the first cable of the respective safety device from the first impact position to a second impact position,the second impact position being at a lower height, measured along the direction of elevation, than the height of the first impact position;
[0023] - the first cable and the second cable of the respective safety device are connected to the loop and / or the attachment of the ventral strand end by a pivot joint, the pivot joint having a complementary projection of a seat groove, the pivot joint extending in the vicinity of a first end of the groove under normal vehicle operating conditions, and the groove having a second end placed at a height lower than the height of the first end in the direction of elevation, and located behind the second anchor point in the longitudinal direction, and in which the pivot joint moves along the groove towards the second end of the groove when an impact force greater than a predetermined force is applied to the vehicle;
[0024] - each safety device includes a first pretensioner linked to a first end of the first cable, configured to trigger when an impact force greater than a predetermined force is applied to the vehicle, and to apply a tensile force to the first cable of the respective safety device resulting in a general downward movement of the loop and / or fastening of the ventral strand end of the seat, and each safety device includes a second pretensioner linked to a first end of the second cable of the respective safety device, configured to trigger when an impact force greater than a predetermined force is applied to the vehicle, and to apply a pulling force on the second cable resulting in a general forward movement of the loop and / or fastening of the ventral strand end of the seat;
[0025] - the seat includes at least one electronic control unit configured for determine the cable or cables on which to apply a tensile force when an impact force greater than a predetermined force is applied to the vehicle;
[0026] - the first cable has a length between 80 mm and 100 mm, and the The second cable has a length between 90 mm and 120 mm.
[0027] The invention also relates to a vehicle comprising at least one seat according to the invention.
[0028] The invention will be better understood upon reading the following description, given solely by way of example and made with reference to the drawings in which:
[0029] - [fig.1] Fig.1 schematically represents a vehicle comprising a plurality of seats according to the invention,
[0030] - [fig.2] [fig.2] schematically represents a seat according to the invention accommodating an occupant,
[0031] - [fig.3] [fig.3] schematically represents a detail of the seat of [fig.2] at level of the security system,
[0032] - [fig.4] the [fig.4] schematically represents the safety device of the [fig.3] in a resting position (dotted lines) and an impact position (solid lines) when the backrest is in a raised position,
[0033] - [fig.5] the [fig.5] schematically represents the safety device of the [fig.3] in a resting position (dotted lines) and in an initial impact position (solid lines) when the backrest is in an inclined position, and
[0034] - [fig.6] The [fig.6] schematically represents the seat belt buckle of the [fig.3] in the first impact position (dotted lines) and in a second impact position (solid lines) when the backrest is in an inclined position.
[0035] In the following description, the elevation direction Z is defined according to the height of a vehicle. This elevation direction Z is, for example, vertical when the vehicle is resting on a horizontal surface.
[0036] The terms "up", "down" define directions respectively up or down of the vehicle according to the elevation direction Z under normal conditions of vehicle use.
[0037] The longitudinal direction X is defined according to the length of the vehicle. This direction The longitudinal X is, for example, horizontal when the vehicle is resting on a level surface and extends in the vehicle's usual direction of travel. The terms "front" and "rear" define directions towards the front of the seat or the rear of the seat, respectively, along the longitudinal X direction and under normal seat usage conditions.
[0038] The transverse direction Y is defined according to the width of the vehicle. This transverse direction Y is, for example, horizontal when the vehicle rests on a horizontal surface and is orthogonal to the longitudinal direction X.
[0039] Normal operating conditions for the seat are conditions in which the vehicle in which the seat is located is used in a conventional manner and has not been subjected to an impact; that is, conditions in which, for example, an accelerometer integrated into the vehicle has not detected an impact force exceeding a predetermined force applied to the vehicle. In other words, normal operating conditions correspond to conditions in which the seat is used outside of an accident scenario.
[0040] A vehicle 1 is shown in [fig.1].
[0041] The vehicle 1 includes at least one seat 10. The vehicle includes, for example, a plurality of seats 10, in particular two seats 10 at the front and three seats 10 or a bench seat at the rear.
[0042] Subsequently, we focus on the description of a seat 10, the invention being applicable to each seat 10 of the vehicle 1.
[0043] The seat 10 is, for example, intended to be mounted in a motor vehicle or in any other type of vehicle, for example railway, maritime or other.
[0044] As can be seen in [fig.2], the seat 10 comprises a backrest 12 and a seat 14.
[0045] Seat 14 is classic and will not be described in more detail here.
[0046] The backrest 12 is mounted to rotate movably relative to the seat 14 around an axis A-A' between an upright position (visible on [fig.1] and 2), in which the backrest forms a first angle α with the elevation direction Z, and at least one inclined position (visible on [fig.2]), in which the backrest forms a second angle [3] with the elevation direction Z, the second angle [3] being greater than the first angle α.
[0047] The first and second angles a and [3 are such that the seat 14 and the backrest 12 define an obtuse angle between them, that is to say an angle equal to or greater than 90°.
[0048] The first angle a is for example between 15° and 25°.
[0049] The second angle [3] is greater than the first angle a and is, for example, included between 25° and 50°. In other words, the file 12 is further away from the Z elevation direction in the inclined position than in the upright position.
[0050] In the raised position of the file 12, the seat 10 is suitable for receiving an occupant 16 in an upright position.
[0051] Thus, in the raised position, the occupant 16 of the seat 10 is seated in the upright position, in which the occupant 16 faces, for example, the windshield and can observe the external environment of the vehicle 1.
[0052] According to one embodiment, the occupant of the seat 10 can place the backrest 12 in a multitude of reclined positions. The reclined position is, for example, a position also called the relax position, in which the occupant 16 of the seat 10 can relax. In the reclined position, the seat 10 is thus suitable for accommodating an occupant 16 in a semi-reclined or reclined position. In particular, in an extreme reclined position of the backrest 12, the occupant of the seat 10 is seated in a reclined position, in which the occupant can relax as if using a bed.
[0053] For any type of vehicle 1, an occupant of seat 10 who is not the driver of said vehicle 1 can adjust their seat 10 to the upright or reclined position as desired. In the context of an autonomous vehicle, in which driver intervention is limited or even nonexistent, the upright position corresponds, for example, to a manual driving configuration for a driver's seat 10, and the reclined position corresponds, for example, to an automatic driving configuration, not requiring driver intervention.
[0054] The seat 10 is for example fixed to the vehicle 1 by a rail 15.
[0055] The seat 10 includes a safety belt 18.
[0056] The seat belt 18 is typically wound on a retractor fixed to an internal wall of the vehicle 1 or to the seat 10.
[0057] In [fig.2], the seat belt 18 is attached.
[0058] The safety belt 18 includes, for example, a thoracic strand 20 and a ventral strand 22.
[0059] When the seat belt 18 is fastened and under normal conditions of use of the vehicle 1, the thoracic strand 20 extends diagonally along the torso 24 of the occupant 16 and the ventral strand 22 extends substantially perpendicularly to the legs 26 of the occupant 16 sitting on the seat 10 and over the thighs 28 of the latter.
[0060] Alternatively, the safety belt 18 comprises only a lap strap 22.
[0061] The seat 10 comprises at least one safety device 29.
[0062] The seat 10 includes a belt buckle 30 attached to the seat 10.
[0063] The loop 30 is placed on a first lateral side 32 of the seat 10.
[0064] The buckle 30 secures the belt 18 to the belt passage 18 between the thoracic strand 20 and ventral strand 22.
[0065] The loop 30 is suitable for receiving the safety belt 18 in order to fasten the belt 18 and keep the occupant 16 on the seat 10, as is the case in [fig.2].
[0066] The loop 30 is for example fixed to the seat 14 or to the rail 15.
[0067] The seat 10 includes a fastening 30 of the end of the ventral strand 22 to the vehicle 1 on a second lateral side of the seat opposite the first lateral side 32 of the seat 10.
[0068] The safety device 29 is for example placed on the first lateral side 32 of the seat 10 or on the second lateral side of the seat 10.
[0069] Preferably, the safety device 29 is placed on the lateral side 32 of the seat 10 where the buckle 30 is attached.
[0070] In a particular embodiment, the seat 10 includes on its two lateral sides a safety device 29.
[0071] In figures 3 to 6, the safety device 29 shown corresponds indifferently to the safety device 29 located on the first lateral side 32 or on the second lateral side of the seat 10.
[0072] Thus, the loop 30 and the attachment 30 of the end of the ventral strand 22 to the vehicle 1 are schematically represented in the same way.
[0073] The description below applies equally to the safety device 29 located on the first lateral side 32 or the second lateral side of the seat 10.
[0074] As can be seen in [fig.3], the safety device 29 includes at least a first anchor point 38 and a second anchor point 36 of the loop 30 on the first lateral side 32 of the seat 10, respectively of the attachment 30 of the end of the ventral strand 22 on the second lateral side of the seat 10.
[0075] The first anchor point 38 and the second anchor point 36 make it possible to keep the loop 30 or the fastening 30 of the end of the ventral strand 22 of the respective safety device 29 attached to the seat 10 in all circumstances and to move the loop 30 or the fastening 30 of the end of the ventral strand 22 around the first anchor point 38 and the second anchor point 36 when an impact force greater than a predetermined force is applied to the vehicle 1, as will be explained below.
[0076] Preferably, the second anchor point 36 is placed at a higher height along the elevation direction Z and further forward than the first anchor point 38 along the longitudinal direction X.
[0077] For example, the second anchor point 36 is at a minimum distance of 60 mm from the first anchor point 38 taken in projection along the longitudinal direction X.
[0078] For example, the second anchor point 36 is at a minimum distance of 40 mm from the first anchor point 38 taken in projection along an elevation direction Z perpendicular to the longitudinal direction X.
[0079] The loop 30 or the fastening 30 of the end of the ventral strand 22 is connected to the first anchor point 38 of the respective safety device 29 by a first cable 42.
[0080] For example, the first cable 42 has a length between 80 mm and 100 mm.
[0081] The first cable 42 extends in a plane comprising the longitudinal directions X and elevation Z.
[0082] The loop 30 or the fastening 30 of the end of the ventral strand 22 is connected to the second anchor point 36 of the respective safety device 29 by a second cable 40.
[0083] For example, the second cable 40 has a length between 90 mm and 120 mm.
[0084] The second cable 40 extends in a plane comprising the longitudinal X and elevation Z directions.
[0085] The first cable 42 and the second cable 40 of the respective safety device 29 are movable around the first anchor point 38 and the second anchor point 36 respectively, which each form a pulley connection.
[0086] Thus, pulling on the second cable 40 results in a general movement of the loop 30 or the attachment 30 of the end of the ventral strand 22 of the respective safety device 29 forward of the seat 10 when the backrest 12 is in the reclined position, and pulling on the first cable 42 results in a general movement of the loop 30 or the attachment 30 of the end of the ventral strand 22 of the respective safety device 29 downward of the seat 10 when the backrest 12 is in the upright or reclined position. "General forward movement" means a movement that reduces the distance measured along the longitudinal direction X between the loop 30 or the attachment 30 of the end of the ventral strand 22 and a front edge 43 of the seat 14, but is not necessarily aligned with this longitudinal direction X.
[0087] By "general downward movement" is meant a movement resulting in a reduction of the distance measured along the elevation direction Z between the loop 30 or the attachment 30 of the end of the ventral strand 22 and the rail 15 on which the seat 10 is fixed, but not necessarily aligned with the elevation direction Z.
[0088] To do this, the first cable 42 has a first end 58 connected to a first pretensioner 46 configured to trigger when an impact force greater than a predetermined force is applied to the vehicle 1, and to apply a tensile force on the first cable 42 in order to move the loop 30 or the fastening 30 of the end of the ventral strand 22 of the respective safety device 29 down the seat 10 in the elevation direction Z.
[0089] The second cable 40 has a first end 52 connected to a second pretensioner 44 configured to trigger when an impact force greater than a predetermined force is applied to the vehicle 1, and to apply a tensile force on the second cable 40 in order to move the loop 30 or the fastening 30 of the end of the ventral strand 22 of the respective safety device 29 forward of the seat 10 in the longitudinal direction X.
[0090] The impact force is a force greater than a predetermined force. This impact force results from a shock detected by accelerometers and / or shock sensors in the vehicle.
[0091] The seat 10 includes in particular an electronic control unit (not shown) configured to determine the cable or cables 40, 42 on which to exert a traction force depending on the position of the seat 10, as will be described in more detail later.
[0092] The first cable 42 includes a second end 60 connected to the pivot link 56 integral with the loop 30 or the attachment of the end of the ventral strand 22.
[0093] In the pivot joint 56, the second end 60 of the first cable 42 is movable in rotation relative to the loop 30 or to the attachment of the end of the ventral strand 22 around an axis parallel to the transverse direction Y.
[0094] The second cable 40 includes a second end 54 linked to the pivot link 56, integral with the loop 30 or the fixing 30 of the end of the ventral strand 22 of the respective safety device 29.
[0095] In the pivot joint 56, the second end 54 of the second cable 40 is movable in rotation relative to the loop 30 or the fixing 30 of the end of the ventral strand 22 of the respective safety device 29 around an axis parallel to the transverse direction Y.
[0096] For example, the pivot joint 56 has a projection 66 complementary to a groove 68 of the seat 10, the groove 68 extending between a first end 70 in the vicinity of the pivot joint 56 under normal conditions of use of the vehicle and a second end 72 placed at a lower height than the height of the first end 70 in the elevation direction Z, and located behind the first anchor point 38 in the longitudinal direction X.
[0097] The groove 68 forms, for example, an arc of a circle.
[0098] The link 64 formed by the projection 66 and the groove 68 prevents the second cable 40 from twisting and buckling when the loop 30 is pulled or the end of the ventral strand 22 is fixed in a general downward movement by taking up the force that the occupant 16 exerts on the belt 18.
[0099] When the backrest 12 is in the raised position, the loop 30 or the attachment of the end of the ventral strand 22 is mobile in translation between a rest position under normal conditions of use of the vehicle and an impact position when an impact force greater than a predetermined force is applied to the vehicle 1, as shown in [fig.4].
[0100] For example, the electronic control unit determines which cable 40, 42 to apply a tensile force to, and when the backrest 12 is in the raised position and when an impact force greater than a predetermined force is applied to the vehicle 1 triggers the application of a traction force on the second cable 42.
[0101] For example, this traction force is exerted by the first pretensioner 46 connected to the first end 58 of the first cable 42. The second pretensioner 44 connected to the first end 52 of the second cable 40 is not triggered.
[0102] The second ends 54, 60 of the first cable 42 and of the second cable 40, connected to the pivot link 56, are driven during the impact while the first end 52 of the second cable 40 is held in place.
[0103] For example, the pivot joint 56 of the loop 30 or of the attachment of the end of the ventral strand 22 in the rest position is at a height greater than the height of the joint 64 along the elevation direction Z, and when an impact force greater than a predetermined force is applied to the vehicle 1, the pivot joint 56 moves along the direction D of the joint 68 formed by the groove 68 and the projection 66 so that the pivot joint 56 is at a lower height measured along the elevation direction Z after the movement.
[0104] The first anchor point 38 and the second anchor point 36 are fixed to the seat 10 and do not move during impact.
[0105] The seat belt 18 is thus pressed against the thighs 28 of the occupant 16.
[0106] When the backrest 12 is in an inclined position, the loop 30 or the attachment of the end of the ventral strand 22 is mobile between a rest position under normal conditions of use of the vehicle and a first impact position when a force greater than a predetermined force is applied to the vehicle 1, as shown in [fig.5].
[0107] For example, the electronic control unit determines the cable 40, 42 on which to apply a traction force, and when the backrest 12 is in an inclined position and an impact force greater than a predetermined force is applied to the vehicle 1, the electronic control unit triggers the application of a traction force first on the second cable 40.
[0108] For example, this traction force is exerted by the second pretensioner 44 connected to the first end 52 of the second cable 40. The first pretensioner 46 connected to the first end 58 of the first cable 42 is not triggered.
[0109] The second ends 60, 54 of the first cable 42 and of the second cable 40, connected respectively to the pivot link 56, are driven during the impact while the second end 58 of the first cable 42 is held in place.
[0110] The first impact position of the loop 30 or of the fastening 30 of the end of the ventral strand 22 is thus at a reduced distance measured along X between the loop 30 and the front edge 43 of the seat 14 or between the fastening 30 of the end of the ventral strand 22 and the front edge 43 of the seat 14.
[0111] The first anchor point 38 and the second anchor point 36 are fixed to the seat 10 and do not move upon impact.
[0112] Then in a second step, from the first impact position, the loop 30 or the fastening 30 of the end of the ventral strand 22 is mobile towards a second impact position in the direction of the second anchor point 36, as shown in [fig.6].
[0113] For example, the electronic control unit determines the cable 40, 42 on which to apply a tensile force, and when the backrest 12 is in an inclined position and the loop 30 or the fastening 30 of the end of the ventral strand 22 is in the first impact position, triggers the application of a tensile force on the first cable 42.
[0114] For example, this traction force is exerted by the first pretensioner 46 connected to the first end 58 of the first cable 42.
[0115] The second ends 60, 54 of the first cable 42 and of the second cable 40, connected to the pivot link 56, are driven in the second time of the impact while the first end 52 of the second cable 40 connected respectively to the first anchor point 38 is held in place.
[0116] For example, the pivot joint 56 of the loop 30 or the attachment 30 of the end of the ventral strand 22 in the first impact position is at a height greater than the height of the pivot joint 56 of the loop 30 or the attachment 30 of the end of the ventral strand 22 in the second impact position measured along the elevation direction Z, and the application of an impact force greater than a predetermined force is applied to the vehicle. Resulting in a general downward movement of the pivot joint 56 from the first impact position to the second impact position along the elevation direction Z.
[0117] The second impact position of the loop 30 or of the attachment of the end of the ventral strand 22 is thus at a lower height than the rest position of the loop 30 or of the attachment of the end of the ventral strand 22 and of the first impact position along the elevation direction Z.
[0118] The first anchor point 38 and the second anchor point 36 are fixed to the seat 10 and do not move during impact.
[0119] In other words, the application of an impact force greater than a predetermined force on the vehicle 1 when the backrest 12 is in the inclined position results in a general sequential movement of the buckle 30 and / or the fastening 30 of the end of the ventral strand 22 and therefore of the effective anchor point of the safety belt 18 forward and then downward while the safety belt 18 is pressed against the thighs 28 of the occupant 16.
[0120] The sequential forward and then downward movement, instead of just the downward movement, ensures that the lap strand 22 of the seat belt 18 found on the thighs 28 of occupant 16 and not on his abdomen.
[0121] This eliminates the risk of submarining by avoiding compression of the occupant's abdomen 16 during its forward projection.
[0122] The position of the anchor points 36, 38 and the length of the cables 40, 42 determine the trajectory and the final position of the loop 30 or the attachment 30 of the end of the ventral strand 22 and thus of the effective anchor point of the safety belt 18.
[0123] Thanks to the invention, the effective anchor point of the seat belt is in a suitable position when the seat back is reclined only when an impact force greater than a predetermined force is applied to the vehicle. It is not necessary to develop an actuation system that moves the seat belt anchor point at all times when the seat back is reclined. This results in weight and cost savings.
[0124] The above description is for a seat facing forward in the vehicle. The directions must be adjusted accordingly when the seat is turned in a different direction in the vehicle.
[0125] According to one variant, the seat includes a single pretensioner for moving the loop or attachment of the ventral strand forward, in the first impact position, when the backrest is in the inclined position, and two pretensioners for moving the loop or attachment of the ventral strand downward, in the second impact position.
[0126] According to another variant, the seat has more anchor points. This allows for finer adjustment of the seat belt position during an impact.
Claims
1.
2.
3. Claims Vehicle seat (10) comprising a seat (14) extending mainly in a longitudinal direction (X) and perpendicular to a direction of elevation (Z), a backrest (12), at least one loop (30) for receiving a seat belt (18) on a first lateral side (32) of the seat (10) and an attachment (30) of the end of a ventral strand (22) of the seat belt (18) on a second lateral side of the seat (10) opposite the first lateral side (32), the seat (10) comprising at least one safety device (29) on the first (32) and / or the second lateral side of the seat (10), each safety device (29) comprising a first cable (42) connecting the loop (30) or the attachment (30) of the end of the ventral strand (22) to a first anchoring point (38),wherein a pull on the first cable (42) of the respective safety device (29) results in a general movement of the loop (30) and / or the attachment (30) of the end of the ventral strand (22) towards the bottom of the seat (10), characterized in that each safety device (29) comprises at least one second cable (40) connecting the loop (30) or the attachment (30) of the end of the ventral strand (22) to a second anchoring point (36) distinct from the first anchoring point (38), and in that a pull on the second cable (40) of the respective safety device (29) results in a general movement of the loop (30) or the attachment (30) of the end of the ventral strand (22) eliminating the risk of submarining and in that, for each safety device (29), the second anchoring point (36) is placed at a higher height in the direction of elevation (Z) and in front of the seat (10) in the longitudinal direction (X) relative to the first anchoring point (38),the second cable (40) extending to a height greater than the height of the first cable (42) in the elevation direction (Z)., A seat (10) according to claim 1, wherein a pull on the second cable (40) of the respective safety device (29) results in a general movement of the loop (30) or the attachment of the end of the ventral strand (22) towards the front of the seat (10). Seat (10) according to claim 1 or 2, wherein the first cable (42) and the second cable (40) of the respective safety device (29) are connected to the loop (30) or to the attachment (30) of the end of the ventral strand (22) by a pivot connection (56).
4.
5.
6. Seat (10) according to any one of claims 1 to 3, wherein the backrest (12) is rotatable relative to the seat (14) about the axis (A-A') between a raised position in which the seat (10) is able to receive an occupant (16) seated in an upright position, and at least one inclined position, in which the seat (10) is able to receive an occupant (16) in a semi-reclined or reclined position, and in which, when the backrest (12) is in the raised position, the loop (30) and / or the attachment (30) of the end of the ventral strand (22) moves by traction on the first cable (42) of the respective safety device (29) from a rest position under normal conditions of use of the vehicle (1), to an impact position when an impact force greater than a predetermined force is applied to the vehicle (1), the impact position being a lower height taken along the elevation direction (Z) than the height of the rest position.Seat (10) according to any one of claims 1 to 4, wherein the backrest (12) is rotatable relative to the seat (14) about the axis (A-A') between a raised position in which the seat (10) is able to receive an occupant (16) seated in an upright position, and at least one inclined position, in which the seat (10) is able to receive an occupant (16) in a semi-reclined or reclined position, and in which, when the backrest (12) is in an inclined position, the loop (30) and / or the attachment (30) of the end of the ventral strand (22) moves by traction on the second cable (40) of the respective safety device (29) from a rest position under normal conditions of use of the vehicle (1), to a first impact position when an impact force greater than a predetermined force is applied to the vehicle (1),the first impact position being at a distance from a front edge (43) of the seat (14) less than the distance between the rest position and the front edge (43) of the seat (14), then by pulling on the first cable (42) of the respective safety device (29) from the first impact position to a second impact position, the second impact position being at a lower height taken in the elevation direction (Z) than the height of the first impact position. Seat (10) according to any one of claims 1 to 5, in which the first cable (42) and the second cable (40) of the respective safety device (29) are connected to the loop (30) and / or to the attachment (30) of the end of the ventral strand (22) by a pivot connection (56), the pivot connection (56) comprising a projection (66) complementary to a groove, (68) of the seat (10), the pivot connection (56) extending in the vicinity of a first end (70) of the groove (68) under normal conditions of use of the vehicle, and the groove (68) having a second end (72) placed at a height lower than the height of the first end (70) in the elevation direction (Z), and located behind the second anchoring point (38) in the longitudinal direction (X), and in which the pivot connection (56) moves following the groove (68) towards the second end (72) of the groove (68) when an impact force greater than a predetermined force is applied to the vehicle (1).
7. A seat (10) according to any one of claims 1 to 6, wherein each safety device (29) comprises a first pretensioner (46) linked to a first end (58) of the first cable (42), configured to trigger when an impact force greater than a predetermined force is applied to the vehicle (1), and to apply a tensile force to the first cable (42) of the respective safety device (29) resulting in a general movement of the loop (30) and / or the attachment (30) of the end of the ventral strand (22) downwards of the seat (10), and each safety device (29) comprises a second pretensioner (44) linked to a first end (52) of the second cable (40) of the respective safety device (29), configured to trigger when an impact force greater than a predetermined force is applied to the vehicle (1),and to apply a tensile force to the second cable (40) resulting in a general movement of the loop (30) and / or the attachment (30) of the end of the ventral strand (22) towards the front of the seat (10).,
8. A seat (10) according to any one of claims 1 to 7, wherein the seat (10) comprises at least one electronic control unit configured to determine the cable(s) (40, 42) on which to exert a traction force when an impact force greater than a predetermined force is applied to the vehicle (1).
9. A seat (10) according to any one of claims 1 to 8, wherein the first cable (40) has a length of between 80 mm and 100 mm, and the second cable (42) has a length of between 90 mm and 120 mm.
10. Vehicle (1) comprising at least one seat (10) according to any one of claims 1 to 9.