Seat for a vehicle and vehicle

Abstract

The invention relates to a seat for a vehicle and to a vehicle, the seat comprising at least one buckle (30) for receiving a safety belt (18) on a first lateral side (32) of the seat (10) and an attachment of an end of a pelvic strap (22) of the safety belt (18) on a second lateral side of the seat (10), the seat (10) comprising at least one safety device (29), each safety device (29) having a first cable (42) connecting the buckle (30) or the attachment of the end of the pelvic strap (22) to a first anchoring point (38) and at least one second cable (40) connecting the buckle (30) or the attachment of the end of the pelvic strap (22) to a second anchoring point (36), a pulling force on the second cable (40) causing an overall movement of the buckle (30) or of the attachment of the end of the pelvic strap (22) for eliminating a submersion risk.

Description

Technical Field

[0001] This invention relates to a seat and a vehicle that includes safety devices. Background Technology

[0002] As is well known, vehicles such as automobiles include multiple seats for accommodating occupants. These seats include at least one backrest and a seat base.

[0003] In most cases, these seats are equipped with seat belts.

[0004] Seat belts typically include a chest strap and a pelvic strap.

[0005] The chest strap extends diagonally across the occupant's torso when the seatbelt is fastened.

[0006] The pelvic strap extends substantially perpendicularly to the legs of the occupant while seated and sits above the occupant's thighs.

[0007] The seat belt is attached to a buckle that is integrated with the seat or vehicle floor.

[0008] In the event of a vehicle colliding with an obstacle, the seatbelt must hold the occupant against the seat and limit forward protrusion as much as possible to prevent the occupant's head from striking, for example, the dashboard, windshield, or the seat in front of it.

[0009] For this purpose, a pretensioner is known to be installed, which is connected to the seat belt via a cable to keep the occupant against the seat.

[0010] When an impact force greater than the predetermined force is applied to the vehicle and detected by the accelerometer or impact sensor, the pretensioner is activated and the cable pulls the buckle in a generally downward movement, thereby pressing the pelvic strap of the seat belt tightly against the occupant's thighs.

[0011] However, if the occupant's seatback is in a reclined position, there is a risk of subsidence even with a pretensioner. Subsidence refers to the occupant slipping under the pelvic strap of the seatbelt during a vehicle impact, which reduces the effectiveness of the seatbelt during such an impact. This reduces the effectiveness of the seatbelt during impact. The seatbelt then actually presses against the occupant's abdomen. This phenomenon can lead to serious abdominal injuries.

[0012] To improve occupant safety, there is a need for more effective safety devices that can protect occupants in the event of an accident. Summary of the Invention

[0013] Therefore, one object of the present invention is a vehicle seat comprising: a seat base extending primarily in a longitudinal direction and perpendicular to the vertical direction; a backrest; at least one buckle for receiving a seat belt on a first lateral side of the seat; and an attachment for the end of a pelvic strap of the seat belt located on a second lateral side of the seat opposite the first lateral side, the seat including at least one safety device on the first and / or second lateral sides of the seat, each safety device having a first cable connecting the attachment for the end of the buckle or pelvic strap to a first anchor point, wherein tension on the first cable of the respective safety device causes the attachment for the end of the buckle and / or pelvic strap to move generally toward the bottom of the seat, characterized in that each safety device includes at least one second cable connecting the attachment for the end of the buckle or pelvic strap to a second anchor point separate from the first anchor point, and wherein tension on the second cable of the respective safety device causes the attachment for the buckle or pelvic strap to move generally to eliminate the risk of subsidence.

[0014] When the backrest is in a reclined position, the buckle can first move forward due to the first buckle anchor point and the first cable, thereby driving the seat belt forward, and then move downward due to the second buckle anchor point and the second cable. This sequential movement pulls the pelvic strap of the seat belt toward the occupant's thighs, preventing the occupant from slipping under the pelvic strap and suffering severe abdominal injury.

[0015] This eliminates the risk of the backrest sinking when it is in a tilted position.

[0016] According to a particular embodiment of the invention, the seat may include the following features, individually or in any technically possible combination:

[0017] - The tension on the second cable of the corresponding safety device causes the attachment at the end of the buckle or pelvic strap to move toward the front of the seat.

[0018] - For each safety device, the second anchor point is positioned at a higher vertical position than the first anchor point and at the front of the seat in the longitudinal direction, and the second cable extends at a higher vertical position than the first cable.

[0019] - The first and second cables of the corresponding safety devices are connected to the attachments at the ends of the buckles or pelvic straps via a pivot connection.

[0020] - The backrest can rotate about an axis relative to the seat base between a raised position and at least one reclining position, in which the seat is adapted to receive an occupant in an upright posture, and in the reclining position the seat is adapted to receive an occupant in a semi-reclined or reclining posture, and wherein when the backrest is in the raised position, the attachments at the ends of the buckles and / or pelvic straps are moved from a stationary position in the normal use state of the vehicle to an impact position when a greater impact force than predetermined is applied to the vehicle, the impact position being located at a lower height in the vertical direction than the stationary position;

[0021] - The backrest is rotatable about an axis relative to the seat base between a raised position and at least one tilted position. In the raised position, the seat is adapted to receive an occupant seated in an upright posture. In the tilted position, the seat is adapted to receive an occupant in a semi-reclined or tilted posture. And wherein when the backrest is in the tilted position, the attachments at the ends of the buckles and / or pelvic straps are moved from a stationary position in the normal use state of the vehicle to a first impact position when a greater impact force than predetermined is applied to the vehicle by the tension on the second cable of the corresponding safety device. The distance between the first impact position and the front edge of the seat base is less than the distance between the stationary position and the front edge of the seat base. And then, by the tension on the first cable of the corresponding safety device, the backrest is moved from the first impact position to a second impact position, which is located at a lower height in the vertical direction than the height of the first impact position.

[0022] - The first and second cables of the corresponding safety devices are connected to the attachments at the ends of the buckle and / or pelvic straps via a pivot connection, the pivot connection having a protrusion complementary to the recess of the seat, the pivot connection extending near the first end of the recess in the normal use state of the vehicle, and the recess having a second end positioned at a height lower than the height of the first end in the vertical direction and positioned behind the second anchor point in the longitudinal direction, and wherein the pivot connection moves along the recess toward the second end of the recess when an impact force greater than a predetermined force is applied to the vehicle;

[0023] - Each safety device includes a first pretensioner connected to a first end of a first cable, configured to activate and apply tension to the first cable of the respective safety device when an impact force greater than a predetermined force is applied to the vehicle, causing the attachments at the ends of the buckles and / or pelvic straps to move generally toward the bottom of the seat; and each safety device includes a second pretensioner connected to a first end of a second cable of the respective safety device, configured to activate and apply tension to the second cable when an impact force greater than a predetermined force is applied to the vehicle, causing the attachments at the ends of the buckles and / or pelvic straps to move generally toward the front of the seat;

[0024] - The seat includes at least one electronic control unit configured to determine which cable(s) to apply tension when an impact force greater than predetermined is applied to the vehicle;

[0025] - The length of the first cable is between 80mm and 100mm, and the length of the second cable is between 90mm and 120mm.

[0026] The present invention also relates to a means of transportation comprising at least one seat according to the present invention. Attached Figure Description

[0027] The invention will be better understood by way of example and with reference to the accompanying drawings, in which:

[0028] - Figure 1 This schematically illustrates a vehicle comprising multiple seats according to the invention;

[0029] - Figure 2 This schematically illustrates a seat according to the invention that accommodates occupants;

[0030] - Figure 3 Show Figure 2 Details of the seat's location at the safety device position;

[0031] - Figure 4 This shows the backrest in the raised position. Figure 3 The safety devices are in the stationary position (dashed line) and the impact position (solid line);

[0032] - Figure 5 This shows the backrest in the reclined position. Figure 3 The safety device is in the stationary position (dashed line) and the first impact position (solid line); and

[0033] - Figure 6 This schematically indicates the position when the backrest is reclined. Figure 3 The seatbelt buckle is located at the first impact position (dashed line) and the second impact position (solid line). Detailed Implementation

[0034] In the following description, the vertical direction Z is defined according to the height of the vehicle. For example, the vertical direction Z is perpendicular when the vehicle is on a horizontal surface.

[0035] The terms "top" and "bottom" respectively define the direction of a vehicle in its normal operating state, moving upward or downward along the vertical direction Z.

[0036] The longitudinal direction X is defined according to the length of the vehicle. For example, this longitudinal direction X is horizontal when the vehicle is on a level surface and extends in the vehicle's usual direction of travel. The terms "front" and "rear" define the direction towards the front or rear of the seat based on the longitudinal direction X and in the normal seating position.

[0037] The lateral direction Y is defined by the width of the vehicle. For example, this lateral direction Y is horizontal and orthogonal to the longitudinal direction X when the vehicle is on a level surface.

[0038] The normal use condition of a seat refers to a vehicle equipped with a seat that is used in a conventional manner and has not yet been subjected to a collision; that is, for example, the accelerometer integrated in the vehicle has not detected an impact force greater than a predetermined force being applied to the vehicle. In other words, the normal use condition corresponds to the state in which the seat is used except in the event of an accident.

[0039] Figure 1 The image shows vehicle 1.

[0040] The vehicle 1 includes at least one seat 10. For example, the vehicle includes multiple seats 10, including two seats 10 at the front and three seats 10 or a bench at the rear.

[0041] In the following description, focus is placed on a seat 10, and the present invention is applicable to each seat 10 of the vehicle 1.

[0042] Seat 10 is intended for installation in motor vehicles or any other type of transport, such as rail vehicles, sea vehicles, etc.

[0043] like Figure 2 As shown, the seat 10 includes a backrest 12 and a seat base 14.

[0044] The seat base 14 is conventional and will not be described further here.

[0045] The backrest 12 is rotatably mounted relative to the seat base 14 around axis A-A' in the raised position (in Figure 1 and 2 (visible in) and at least one tilted position (in) Figure 2 (As can be seen in the middle) In the raised position, the backrest forms a first angle α with the vertical direction Z, and in the tilted position, the backrest forms a second angle β with the vertical direction Z. The second angle β is greater than the first angle α.

[0046] The first angle α and the second angle β define an obtuse angle, that is, an angle equal to or greater than 90°, between the seat base 14 and the backrest 12.

[0047] The first angle α is, for example, between 15° and 25°.

[0048] The second angle β is greater than the first angle α and is, for example, between 25° and 50°. In other words, the backrest 12 is further away from the vertical direction Z in the tilted position than in the raised position.

[0049] In the raised position of the backrest 12, the seat 10 is adapted to receive an occupant 16 in an upright position.

[0050] Therefore, in the raised position, the occupant 16 of the seat 10 sits in an upright posture, facing, for example, the windshield, and can observe the environment outside the vehicle 1.

[0051] According to one embodiment, the occupant of seat 10 can place the backrest 12 in multiple reclining positions. For example, the reclining position is also referred to as the resting position, in which the occupant 16 of seat 10 can rest. In the reclining position, seat 10 can therefore accommodate the occupant 16 in a semi-reclining or reclining position. In particular, at the extreme reclining position of the backrest 12, the occupant of seat 10 sits in a reclining position, in which the occupant can rest in a manner equivalent to using a sleeper berth.

[0052] For any type of vehicle 1, the seat occupant 10 who is not the driver of the vehicle 1 can adjust their seat 10 to a raised or reclined position as needed. In the case of an autonomous vehicle with a restricted or unmanned driver, the raised position corresponds, for example, to a manual driving configuration for the driver's seat 10, and the reclined position corresponds, for example, to an autonomous driving configuration that does not require any driver intervention.

[0053] Seat 10 is attached to vehicle 1, for example, via track 15.

[0054] Seat 10 includes seat belt 18.

[0055] The seat belt 18 is typically wrapped around a retractor attached to the inner wall of the vehicle 1 or the seat 10.

[0056] exist Figure 2 In the middle, seat belt 18 was fastened.

[0057] Seat belts 18 include, for example, chest straps 20 and pelvic straps 22.

[0058] When the seat belt 18 is fastened and the vehicle 1 is in its normal use state, the chest strap 20 extends diagonally along the torso 24 of the occupant 16 and the pelvic strap 22 extends substantially perpendicularly to the legs 26 of the occupant 16 sitting on the seat 10 and is located above the thighs 28 of the occupant 16.

[0059] In one variant, the seatbelt 18 consists only of the pelvic strap 22.

[0060] Seat 10 includes at least one safety device 29.

[0061] The seat 10 includes a buckle 30 integrally formed with the seat 10.

[0062] The buckle 30 is positioned on the first lateral side 32 of the seat 10.

[0063] Buckle 30 ensures that seat belt 18 is attached to seat belt 18 that extends between chest strap 20 and pelvic strap 22.

[0064] Buckle 30 is adapted to receive seat belt 18, thereby attaching seat belt 18 and retaining occupant 16 in seat 10, such as Figure 2 As shown.

[0065] Buckle 30 is attached, for example, to seat base 14 or track 15.

[0066] The seat 10 includes an attachment for the vehicle 1 located on the second lateral side of the seat 10 opposite the first lateral side 32, at the end of the pelvic strap 22.

[0067] For example, the safety device 29 is located on the first lateral side 32 of the seat 10 or on the second lateral side of the seat 10.

[0068] Preferably, the safety device 29 is located on the lateral side 32 of the seat 10 when the buckle 30 is attached.

[0069] In one particular embodiment, the seat 10 has safety devices 29 on both lateral sides of the seat 10.

[0070] exist Figures 3 to 6 In the diagram, the safety device 29 shown corresponds to the safety device 29 positioned on the first lateral side 32 or the second lateral side of the seat 10.

[0071] Therefore, the attachments to the ends of the buckle 30 and the pelvic strap 22 for the vehicle 1 are schematically shown in the same manner.

[0072] The following description applies equally to the safety device 29 located on the first lateral side 32 or the second lateral side of the seat 10.

[0073] like Figure 3 As shown, the safety device 29 includes at least a first anchor point 38 and a second anchor point 36 for an attachment to a buckle 30 on a first lateral side 32 of the seat 10 or to the end of a pelvic strap 22 on a second lateral side of the seat 10.

[0074] The first anchor point 38 and the second anchor point 36 allow the buckle 30 of the corresponding safety device 29 or the attachment at the end of the pelvic strap 22 to remain integral with the seat 10 in all cases, and to move the attachment at the end of the buckle 30 or the pelvic strap 22 around the first anchor point 38 and the second anchor point 36 when an impact force greater than the predetermined force is applied to the vehicle 1, as will be described below.

[0075] Preferably, the second anchor point 36 is positioned at a higher height along the vertical direction Z and at a more forward position along the longitudinal direction X compared to the first anchor point 38.

[0076] For example, when projected along the longitudinal direction X, the second anchor point 36 is at least 60 mm away from the first anchor point 38.

[0077] For example, when projected along the vertical direction Z perpendicular to the longitudinal direction X, the minimum distance between the second anchor point 36 and the first anchor point 38 is 40mm.

[0078] The attachment at the end of the buckle 30 or pelvic strap 22 is connected to the first anchor point 38 of the corresponding safety device 29 via the first cable 42.

[0079] For example, the length of the first cable 42 is between 80mm and 100mm.

[0080] The first cable 42 extends in a plane that includes the longitudinal direction X and the vertical direction Z.

[0081] The attachment at the end of the buckle 30 or pelvic strap 22 is connected to the second anchor point 36 of the corresponding safety device 29 via the second cable 40.

[0082] For example, the length of the second cable 40 is between 90mm and 120mm.

[0083] The second cable 40 extends in a plane that includes the longitudinal direction X and the vertical direction Z.

[0084] The first cable 42 and the second cable 40 of the corresponding safety device 29 can move around the first anchor point 38 and the second anchor point 36 that form the pulley connection with each other, respectively.

[0085] Therefore, the tension on the second cable 40, when the backrest 12 is in an inclined position, causes the attachments at the ends of the buckles 30 or pelvic straps 22 of the corresponding safety devices 29 to move generally forward toward the front of the seat 10, and the tension on the first cable 42, when the backrest 12 is in an upright or inclined position, causes the attachments at the ends of the buckles 30 or pelvic straps 22 of the corresponding safety devices 29 to move generally downward toward the bottom of the seat 10. "General forward movement" refers to a movement that results in a decrease in the distance measured along the longitudinal direction X between the attachments at the ends of the buckles 30 or pelvic straps 22 and the front edge 43 of the seat base 14, but does not need to be aligned with this longitudinal direction X.

[0086] "General downward movement" refers to a movement that results in a decrease in the distance measured between the attachment at the end of the buckle 30 or pelvic strap 22 along the vertical direction Z and the track 15 to which the seat 10 is attached, but does not need to be aligned with the vertical direction Z.

[0087] For this purpose, the first cable 42 has a first end 58 connected to a first pretensioner 46, which is configured to activate when a greater impact force than predetermined is applied to the vehicle 1 and apply tension to the first cable 42, thereby causing the attachment of the buckle 30 of the corresponding safety device 29 or the end of the pelvic strap 22 to move along the vertical direction Z toward the bottom of the seat 10.

[0088] The second cable 40 has a first end 52 connected to a second pretensioner 44, which is configured to activate when a greater than predetermined impact force is applied to the vehicle 1 and to apply tension to the second cable 40, thereby causing the attachment of the buckle 30 of the corresponding safety device 29 or the end of the pelvic strap 22 to move along the longitudinal direction X toward the front of the seat 10.

[0089] Impact force is a force greater than the predetermined force. This impact force originates from the impact detected by the accelerometer and / or impact sensors in the vehicle.

[0090] Specifically, the seat 10 includes an electronic control unit (not shown) configured to determine the cables 40, 42 to be tensioned based on the position of the seat 10, which will be described in more detail later.

[0091] The first cable 42 includes a second end 60, which is connected to a pivot connection 56 integral with an attachment to the end of the buckle 30 or the pelvic strap 22.

[0092] In the pivot connection 56, the second end 60 of the first cable 42 can rotate about an axis parallel to the lateral direction Y relative to the attachment of the buckle 30 or the end of the pelvic strap 22.

[0093] The second cable 40 includes a second end 54, which is connected to a pivot connection 56 integral with an attachment to the end of the buckle 30 of the corresponding safety device 29 or the pelvic strap 22.

[0094] In the pivot connection 56, the second end 54 of the second cable 40 can rotate about an axis parallel to the lateral direction Y relative to the buckle 30 of the corresponding safety device 29 or the attachment of the end of the pelvic strap 22.

[0095] For example, the pivot connection 56 includes a protrusion 66 that complements the recess 68 of the seat 10. The recess 68 extends between a first end 70 located near the pivot connection 56 in the normal vehicle use state and a second end 72 located at a lower height than the first end 70 along the vertical direction Z and located behind the first anchor point 38 along the longitudinal direction X.

[0096] For example, groove 68 forms an arc.

[0097] When the buckle 30 is pulled or the end of the pelvic strap 22 is attached during the overall downward movement, the connection 64 formed by the protrusion 66 and the groove 68 prevents the second cable 40 from twisting or bending by bearing the force exerted on the seat belt 18 by the occupant 16.

[0098] When the backrest 12 is in the raised position, the end attachments of the buckle 30 or pelvic strap 22 can translate between a stationary position under normal vehicle use and an impact position when a greater than predetermined impact force is applied to the vehicle 1, such as... Figure 4 As shown.

[0099] For example, the electronic control unit determines which cables 40, 42 to apply tension to, and begins to apply tension to the second cable 42 when the backrest 12 is in the raised position and an impact force greater than the predetermined force is applied to the vehicle 1.

[0100] For example, the tension is applied by a 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 activated.

[0101] The second ends 54 and 60 of the first cable 42 and the second cable 40, which are connected to the pivot connection 56, are driven upon impact, while the first end 52 of the second cable 40 remains in place.

[0102] For example, the pivot connection 56 of the end attachment of the buckle 30 or pelvic strap 22 is located at a higher height than the connection 64 in the vertical direction Z when at rest. And when a greater than predetermined impact force is applied to the vehicle 1, the pivot connection 56 moves in the direction D of the connection 68 formed by the groove 68 and the protrusion 66, so that the pivot connection 56 is located at a lower height measured in the vertical direction Z after the movement.

[0103] The first anchor point 38 and the second anchor point 36 are integral with the seat 10 and do not move upon impact.

[0104] The seatbelt 18 was therefore pressed against the thigh 28 of the occupant 16.

[0105] When the backrest 12 is in the reclined position, the end attachments of the buckle 30 or the pelvic strap 22 can move between a stationary position under normal vehicle use conditions and a first impact position when a force greater than predetermined is applied to the vehicle 1, such as... Figure 5 As shown.

[0106] For example, the electronic control unit determines which cables 40, 42 to apply tension to, and when the backrest 12 is in an inclined position and an impact force greater than the predetermined force is applied to the vehicle 1, the electronic control unit begins to apply tension to the second cable 40.

[0107] For example, the tension is applied by a 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 activated.

[0108] The first cable 42 and the second cable 40 are respectively connected to the second ends 60 and 54 of the pivot connection 56 and are driven upon impact, while the second end 58 of the first cable 42 remains in place.

[0109] The first impact position of the attachment at the end of the buckle 30 or pelvic strap 22 is therefore located at a reduced distance measured along X between the buckle 30 and the front edge 43 of the seat base 14 or between the attachment at the end of the pelvic strap 22 and the front edge 43 of the seat base 14.

[0110] The first anchor point 38 and the second anchor point 36 are integral with the seat 10 and do not move upon impact.

[0111] Subsequently, in the second step, the attachment at the end of the buckle 30 or the pelvic strap 22 can move from the first impact position to the second impact position toward the second anchor point 36, as... Figure 6 As shown.

[0112] For example, the electronic control unit determines which cables 40, 42 to apply tension to, and begins to apply tension to the first cable 42 when the backrest 12 is in the tilted position and the attachment at the end of the buckle 30 or pelvic strap 22 is in the first impact position.

[0113] For example, the tension is applied by a first pretensioner 46 connected to the first end 58 of the first cable 42.

[0114] The second ends 60 and 54 of the first cable 42 and the second cable 40, which are connected to the pivot connection 56, are driven during the second impact time, while the first end 52 of the second cable 40, which is correspondingly connected to the first anchor point 38, remains in place.

[0115] For example, the pivot connection 56 of the attachment at the end of the buckle 30 or pelvic strap 22 is located at a higher height in the first impact position than the pivot connection 56 of the attachment at the end of the buckle 30 or pelvic strap 22 is measured along the vertical direction Z in the second impact position, and an impact force greater than the predetermined force is applied to the vehicle 1, causing the pivot connection 56 to move downward along the vertical direction Z from the first impact position to the second impact position.

[0116] The second impact position of the attachment at the end of the buckle 30 or pelvic strap 22 is therefore located at a lower height along the vertical direction Z than the rest position and the first impact position of the attachment at the end of the buckle 30 or pelvic strap 22.

[0117] The first anchor point 38 and the second anchor point 36 are integral with the seat 10 and do not move upon impact.

[0118] In other words, when the backrest 12 is in the reclined position, a greater impact force than the predetermined force is applied to the vehicle 1 as the seat belt 18 presses against the thigh 28 of the occupant 16, causing a forward and then downward overall sequential movement of the attachments at the ends of the buckle 30 and / or the pelvic strap 22, and thus the effective anchor point of the seat belt 18.

[0119] Instead of a sequential forward and then downward movement that only moves downwards, the pelvic strap 22 of the seat belt 18 is positioned on the thigh 28 of the occupant 16 rather than on their abdomen.

[0120] This eliminates the risk of descent by avoiding compression of the abdomen when crew member 16 protrudes forward.

[0121] The positions of anchor points 36 and 38 and the lengths of cables 40 and 42 determine the trajectory and final position of the effective anchor point of the buckle 30 or the attachment at the end of the pelvic strap 22, and thus the safety belt 18.

[0122] This invention ensures that the seatbelt anchor point is correctly positioned only when a greater-than-predictable impact force is applied to the vehicle and the backrest is in a reclined position. It eliminates the need to develop a drive system that moves the seatbelt anchor point at all times when the backrest is reclined. This results in savings in size and cost.

[0123] The above instructions are for seats facing the front of the vehicle. When the seat rotates to the other direction of the vehicle, the orientation must be adjusted accordingly.

[0124] According to one variant, the seat includes a single pretensioner for moving the attachment of the buckle or pelvic strap forward in a first impact position when the backrest is in an inclined position, and two pretensioners for moving the attachment of the buckle or pelvic strap downward in a second impact position.

[0125] In another variant, the seat has more anchor points. This improves the positioning of the seatbelt during a crash.

Claims

1. A seat (10) for a vehicle, comprising: a seat base (14) extending mainly along a longitudinal direction (X) and perpendicularly to a vertical direction (Z); a backrest (12); at least one belt buckle (30) for receiving a safety belt (18) on a first lateral side (32) of the seat (10); and an attachment of an end of a pelvic harness (22) of the safety belt (18) in a raised position for 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 lateral side (32) and / or on the second lateral side of the seat (10), each safety device (29) having a first cable (42) connecting the belt buckle (30) or the attachment of the end of the pelvic harness (22) to a first anchor point (38), wherein a pulling force on the first cable (42) of the respective safety device (29) causes an overall movement of the belt buckle (30) and / or of the attachment of the end of the pelvic harness (22) towards the bottom of the seat (10), characterized in that each safety device (29) comprises at least one second cable (40) connecting the belt buckle (30) or the attachment of the end of the pelvic harness (22) to a second anchor point (36) separate from the first anchor point (38), and wherein a pulling force on the second cable (40) of the respective safety device (29) causes an overall movement of the belt buckle (30) or of the attachment of the end of the pelvic harness (22) for eliminating the risk of submersion, for each safety device (29), the second anchor point (36) is positioned at a higher level along the vertical direction (Z) and at a front of the seat (10) along the longitudinal direction (X) compared to the first anchor point (38), the second cable (40) extending at a higher level along the vertical direction (Z) than the level of the first cable (42).

2. The seat (10) according to claim 1, characterized in that a pulling force on the second cable (40) of the respective safety device (29) causes an overall movement of the belt buckle (30) or of the attachment of the end of the pelvic harness (22) towards the front of the seat (10).

3. The seat (10) according to claim 1 or 2, characterized in that the first cable (42) and the second cable (40) of the respective safety device (29) are connected to the attachment of the end of the belt buckle (30) or of the pelvic harness (22) by a pivotal connection (56).

4. The seat (10) according to claim 1 or 2, characterized in that the backrest (12) is rotatable about an axis (A-A') relative to the seat base (14) between a raised position in which the seat (10) is adapted to receive an occupant (16) seated in an upright position and at least one reclined position in which the seat (10) is adapted to receive an occupant (16) in a semi-reclined or inclined position, and wherein said attachments of said belt buckle (30) and / or of said end of said pelvic belt (22) are moved from a rest position in a normal use condition of the vehicle (1) to a crash position at a lower height than the height of said rest position along said vertical direction (Z) by a pulling force on said first cable (42) of the respective safety device (29) when a greater than predetermined force impact is applied to the vehicle (1).

5. The seat (10) according to claim 1 or 2, characterized in that said backrest (12) is rotatable about an axis (A-A') with respect to said seat base (14) between a raised position in which said seat (10) is able to receive an occupant (16) seated in an upright position and at least one reclined position in which said seat (10) is able to receive an occupant (16) in a semi-reclined or inclined position, and wherein said attachments of said belt buckle (30) and / or of said end of said pelvic belt (22) are moved from a rest position in a normal use condition of the vehicle (1) to a first crash position at a distance from a front edge (43) of said seat base (14) smaller than the distance between said rest position and said front edge (43) of said seat base (14) by a pulling force on said second cable (40) of the respective safety device (29) when a greater than predetermined force impact is applied to the vehicle (1) and subsequently from said first crash position to a second crash position at a lower height than the height of said first crash position along said vertical direction (Z) by a pulling force of said first cable (42) of the respective safety device (29).

6. The seat (10) according to claim 1 or 2, characterized in that said first cable (42) and said second cable (40) of the respective safety device (29) are connected to said attachments of said belt buckle (30) and / or of said end of said pelvic belt (22) by a pivotal connection (56) having a protrusion (66) complementary to a recess (68) of said seat (10), said pivotal connection (56) extending in a normal use condition of the vehicle near a first end (70) of said recess (68) and said recess (68) having a second end (72) positioned at a lower height than the height of said first end (70) along said vertical direction (Z) and positioned rearward of said second anchoring point (36) along said longitudinal direction (X), and wherein said pivotal connection (56) moves along said recess (68) towards said second end (72) of said recess (68) when a greater than predetermined force impact is applied to the vehicle (1).

7. The seat (10) according to claim 1 or 2, characterized in that Each of said safety devices (29) comprises a first pretensioner (46) connected to a first end (58) of said first cable (42), configured to activate and apply a pulling force to said first cable (42) of the respective said safety device (29) when an impact force greater than a predetermined force is applied to the vehicle (1), to cause said attachments of the ends of said belt buckle (30) and / or of said pelvic harness (22) to move overall towards the bottom of said seat (10), and each of said safety devices (29) comprises a second pretensioner (44) connected to a first end (52) of said second cable (40) of the respective said safety device (29), configured to activate and apply a pulling force to said second cable (40) when an impact force greater than a predetermined force is applied to the vehicle (1), to cause said attachments of the ends of said belt buckle (30) and / or of said pelvic harness (22) to move overall towards the front of said seat (10).

8. The seat (10) according to claim 1 or 2, characterized in that Said seat (10) comprises at least one electronic control unit configured to determine on which cable or cables to apply a pulling force when an impact force greater than a predetermined force is applied to the vehicle (1).

9. The seat (10) according to claim 1 or 2, characterized in that The length of said first cable (42) is between 80 mm and 100 mm and the length of said second cable (40) is between 90 mm and 120 mm.

10. A vehicle (1) characterized in that It comprises at least one seat (10) according to claim 1 or 2. Each of said safety devices (29) comprises a first pretensioner (46) connected to a first end (58) of said first cable (42), configured to activate and apply a pulling force to said first cable (42) of the respective said safety device (29) when an impact force greater than a predetermined force is applied to the vehicle (1), to cause said attachments of the ends of said belt buckle (30) and / or of said pelvic harness (22) to move overall towards the bottom of said seat (10), and each of said safety devices (29) comprises a second pretensioner (44) connected to a first end (52) of said second cable (40) of the respective said safety device (29), configured to activate and apply a pulling force to said second cable (40) when an impact force greater than a predetermined force is applied to the vehicle (1), to cause said attachments of the ends of said belt buckle (30) and / or of said pelvic harness (22) to move overall towards the front of said seat (10). Said seat (10) comprises at least one electronic control unit configured to determine on which cable or cables to apply a pulling force when an impact force greater than a predetermined force is applied to the vehicle (1). The length of said first cable (42) is between 80 mm and 100 mm and the length of said second cable (40) is between 90 mm and 120 mm. It comprises at least one seat (10) according to claim 1 or 2.

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