FR3140029A1 - Seat with airbag for motor vehicle - Google Patents

Abstract

The invention proposes a seat (20) for a motor vehicle. The seat comprises a seat (24), a backrest (26), an airbag safety device (40) also called an airbag, an armrest (30) comprising an upper portion (48) with a support surface (36) . The backrest comprises a lower portion (46), an upper portion with a front surface (50), and a pivot connection (52) allowing the upper portion to be folded down to the level of the armrest, the pivot connection being vertically at the level of the upper portion. The safety device is in the upper portion and the upper surface includes a rupture zone crossed by the safety device during its deployment; or the safety device is in the upper portion of the backrest, and above the pivot connection the front surface includes a rupture zone crossed by the safety device during its deployment. Figure to be published with the abstract: Fig. 2

Description

Seat with airbag for motor vehicle

The invention relates to the safety of motor vehicles. More specifically, the invention proposes a motor vehicle seat with an airbag safety device. The invention proposes a motor vehicle with a seat provided with an airbag safety device.

In anticipation of a possible collision, a motor vehicle is equipped with inflatable devices forming passenger protection cushions. When a collision is detected, the pyrotechnic charge is ignited in order to inflate the inflatable device in a fraction of a second. Such an inflatable device, commonly called an airbag, equips a dashboard, the steering wheel, or even the side walls of the vehicle.

Certain inflatable devices are associated directly with a vehicle seat in order to deploy as close as possible to the passenger, and to form a shock absorber between the passenger's body and the adjoining wall. In such a case, the inflatable device will prove useful in the event of a side impact towards the seat. It will provide protection to the thorax, shoulder and head of the corresponding passenger.

Document EP3626523B1 proposes a folding seat for a motor vehicle. The folding seat has a seat, a backrest and a headrest. The seat folds into a compact configuration to store it in a confined space. For this purpose, it has a first articulation connecting the backrest to the seat; and a second joint connecting the headrest to the backrest. However, this seat remains impractical. In fact, some users use their vehicle as a workspace. In addition, comfort remains limited.

Document US11040686B2 presents a vehicle seat with side airbag devices. The vehicle seat comprises: a side frame which constitutes a side part of a backrest frame; a bracket which includes a fixing part fixed to a side surface of the side frame on a seat inner side and a rear part protruding rearwardly from the fixing part; and an airbag module that is attached to the rear protruding part, specifically to a rear surface of the outer extension part that faces rearward.

Document JP2010115960A proposes a motor vehicle bench seat. The bench has two seats, and a retractable armrest between these seats. In the retracted position, the armrest fits into a recess formed in the one-piece backrest of the bench seat. The armrest also has an airbag.

Document CA2258998A1 describes an airbag system associated with a vehicle seat. The airbag protects against side impacts and is located in an outboard armrest of the seat. During a collision, this cushion deploys from an exterior side of the armrest. The airbag moves outward away from the occupant and against the door or a body side panel. The cushion fills the entire space between the occupant and the door to protect the torso, neck and head during a collision.

However, the layout of the airbag system slows down its deployment. Therefore, the lateral protection provided to an occupant is delayed. This aspect harms the safety of the motor vehicle.

The invention aims to respond to at least one of the problems or disadvantages encountered in the prior art. In particular, the invention aims to optimize the safety and modularity of a motor vehicle seat. The invention also aims to optimize the modularity, compactness and ergonomics of a motor vehicle seat while limiting the consequences of a collision.

According to a first aspect, the invention proposes a seat for a motor vehicle, the seat comprising a seat, a backrest with a lower portion, an airbag safety device capable of protecting an occupant of said seat, an armrest comprising an upper body with a support surface, remarkable in that the backrest further comprises a pivot connection and an upper portion with a front surface, the upper portion pivoting relative to the lower portion between an upright position and a folded position at the level of the armrest, the lower portion extending vertically at the level of the upper body; the airbag safety device being arranged in the upper body of the armrest and the upper surface comprises a first rupture zone capable of being crossed by the airbag safety device; or the airbag safety device being disposed in the upper portion of the backrest and, the front surface comprises a second rupture zone which is capable of being crossed by the airbag safety device and which extends above the upper surface.

In the upright position, the invention provides protection above the upper surface, this surface determining the level where the upper portion folds. Thus, the invention increases the protection zone provided by the airbag safety device, while shortening the upper portion. Therefore, the invention increases safety for the passenger while improving the compactness of the folded backrest. In particular, the airbag safety device covers the upper body more quickly, where the most fragile organs are present.

Preferably, the airbag safety device is arranged in the upper body, the upper body also comprising a front section, the first rupture zone extending into the front section of the upper body.

Preferably, the seat comprises a horizontal direction, the airbag safety device has a main elongation inclined relative to the horizontal direction by a first angle of between 20° and 50°.

Preferably, the airbag safety device is arranged in the upper body, the airbag safety device has a main elongation arranged horizontally and parallel to the support surface.

Preferably, the airbag safety device is arranged in the upper portion of the backrest and has a main extension arranged vertically.

Preferably, the seat comprises a vertical direction, the airbag safety device is arranged in the upper portion of the backrest, the airbag safety device has a main elongation inclined relative to the vertical direction by a second angle between 30° and 60°.

Preferably, the upper portion of the backrest comprises a frame and a triangular fixing support, the airbag safety device being fixed to the frame via the fixing support.

Preferably, the seat comprises a reclining headrest connected to the upper portion of the backrest, the seat being configured to be in a retracted configuration in which the upper portion is in the folded position and in which the headrest is folded vertically at the level of the upper body of the armrest.

Preferably, the pivot connection is vertically at the level of the upper body.

Preferably, the support surface is configured to receive the elbow of a seat occupant.

Preferably, the seat comprises a deployment zone of the airbag safety device delimited by the support surface of the armrest and the front surface of the upper portion of the backrest.

Preferably, the backrest comprises a side face and a front face with a rupture zone, the airbag safety device being configured to deploy through the rupture zone.

Preferably, the upper portion is narrower transversely than the lower portion.

Preferably, the pivot connection comprises a double hinge.

Preferably, the upper portion comprises a lower section and an upper section, the upper section being narrower than the lower section.

Preferably, the armrest is a fixed armrest relative to the seat.

Preferably, the upper portion is capable of pivoting by at least 45° relative to the lower portion.

Preferably, the upper portion is capable of pivoting by at least 60° relative to the lower portion.

Preferably, the upper portion is capable of pivoting by at least 90° relative to the lower portion.

According to another aspect, the invention proposes a motor vehicle seat, the seat comprising a seat, a side armrest with a support surface configured to receive the elbow of a user; a backrest with a side surface and a front surface extending above the support surface; remarkable in that the front surface comprises a first incipient rupture and the backrest comprises an airbag safety device capable of deploying through the first incipient rupture of the front surface; or the upper surface comprises a second incipient rupture and the armrest comprises an airbag safety device capable of deploying through the second incipient rupture of the support surface; so as to extend vertically and longitudinally at the level of the user's thorax; the backrest optionally comprising a pivot connection under a deployment zone of the airbag safety device.

According to another aspect, the invention proposes a motor vehicle seat, the seat comprising a seat; a backrest with a lower portion extending from the seat, an upper portion above the lower portion, a pivot connection pivotally connecting the upper portion to the lower portion, the upper portion being movable between a high position and a folded position; a pivoting zone swept by the upper portion between the up position and the folded down position; remarkable in that the seat comprises an air bag safety device arranged vertically at the level of the pivoting zone; or the side airbag safety device is arranged at the pivot link.

According to another aspect, the invention proposes a motor vehicle seat, the seat comprising a seat; a backrest with a rear surface; a pivot connection pivotally connecting the backrest to the seat, the backrest being configured to pivot between an upright position and a folded position; characterized in that the seat further comprises an armrest with an upper support surface; the seat being configured so that in the folded position the rear surface of the backrest is vertically at the level of the upper support surface of the armrest, Thus, the combination of these surfaces forms an extended working area. The invention improves the modularity of a seat.

According to another aspect, the invention proposes a motor vehicle seat, the seat comprising a seat; a backrest with a lower portion extending vertically from the seat, an armrest with an upper support surface; characterized in that the backrest further comprises an upper portion above the lower portion and comprising a rear surface; the backrest further comprising a pivoting connection connecting the upper portion to the lower portion in a pivoting manner between an upright position and a folded position; the seat being configured so that in the folded position the rear surface of the backrest is vertically at the level of the upper support surface of the armrest,

Preferably, in the folded position the rear surface and the upper support surface are parallel or coplanar.

According to another aspect, the invention proposes a motor vehicle seat, the seat comprising a seat; a backrest with a lower portion extending from the seat, an armrest with a support surface; and an air bag safety device; remarkable in that the backrest further comprises an upper portion above the lower portion and a pivot connection connecting the upper portion to the lower portion in a pivoting manner in order to fold the upper portion vertically at the level of the armrest; the pivoting connection being arranged vertically at the level of the upper support surface; the airbag safety device being arranged in the armrest or in the upper portion of the backrest.

According to another aspect, the invention proposes a motor vehicle comprising a seat characterized in that the seat is in accordance with the invention, the motor vehicle comprises a side wall, the air bag safety device being on the side of said side wall and being able to deploy transversely between the upper portion of the backrest and the side wall.

According to another aspect, the invention proposes a motor vehicle comprising a seat and a side wall adjoining the seat; the seat comprising a seat, a side armrest on the side of the side wall and having a support surface; a backrest with a front surface above the supporting surface of the side armrest; remarkable in that the side armrest comprises a side airbag safety device capable of deploying through the support surface, or the backrest comprises a side airbag safety device capable of deploying through the front surface and above the support surface; said side airbag safety device being capable of deploying transversely between the backrest and the side wall.

Preferably, the motor vehicle comprises a central console with an upper area, and the upper portion of the backrest comprises a rear surface; in the folded position, the rear surface is vertically level with the upper area.

Preferably, the vehicle comprises a central console, the seat being laterally on one side of said central console, and the central console has an upper surface vertically at the level of the support surface of the armrest.

The invention will be well understood and other aspects and advantages will appear clearly on reading the description which follows given with reference to the figures appended and listed below.

There is a side view of a motor vehicle according to the invention.

There shows in profile a motor vehicle seat according to a first embodiment of the invention.

There represents a motor vehicle seat with an air bag safety device deployed according to the invention.

There shows in profile a motor vehicle seat according to a second embodiment of the invention.

There represents a motor vehicle seat armrest according to the second embodiment of the invention.

There is a rear view of a motor vehicle seat back according to a third embodiment of the invention.

There is a rear view of a motor vehicle seat back according to a fourth embodiment of the invention.

There presents in profile a motor vehicle seat with a backrest in folded configuration according to the invention.

There presents a passenger compartment of a motor vehicle with two seats according to the invention.

In the following description, the term “include” is synonymous with “include” and is not restrictive in that it authorizes the presence of other elements in the motor vehicle or the seat to which it relates. It is understood that the term “understand” includes the terms “consist of”. The terms “external” and “internal” will respectively designate what is oriented towards the exterior of the vehicle and towards the interior of the vehicle.

In this description, the term “longitudinal”, the term “longitudinal”, the term “transverse”, and the term “transversely” are used according to the reference of the vehicle, in the assembly configuration. The term “longitudinal” corresponds to the main direction of movement of the vehicle. The term “transverse” corresponds to a direction perpendicular to the main direction of movement of the vehicle. The term “front” refers to the main direction of movement of the vehicle. The term “rear” refers to the opposite of the front of the vehicle.

The X axis represents the longitudinal direction, the Y axis represents the transverse direction, and the Z axis represents the vertical direction. These three axes define a trihedron whose orientation is preserved throughout the figures.

In this description, the value ranges include the limits which delimit them.

Through the description, the different figures use the same reference signs to designate identical or similar entities.

There represents a motor vehicle 10 according to the invention. The motor vehicle 10 comprises energy storage means and at least one motor (not shown) adapted to drive said motor vehicle 10.

The motor vehicle 10 comprises a structure 12, also called a body. Structure 12 partially forms the body of the vehicle at the level of the roof, the front fenders, the “C” pillars. The structure 12 supports different components of the motor vehicle 10. The structure 12 delimits in particular the passenger compartment 14 of the vehicle. The passenger compartment 14 is capable of receiving passengers, for example at the front and rear of the motor vehicle 10. The passenger compartment 14 is delimited laterally by side walls 15. The side walls 15 can be formed by the doors lateral, and possibly by a central pillar; or B pillar.

The passenger compartment 14 houses a central console 16. The central console 16 receives various controls (not shown). It extends longitudinally in the front half of the passenger compartment 14. It forms a protrusion on the floor of the passenger compartment 14. The central console 16 has an upper area 18. The upper area extends longitudinally. The upper area is approximately horizontal.

The motor vehicle 10 comprises at least one seat 20; preferably several seats (only one visible). The motor vehicle 10 may include at least two front seats and a rear bench. The two front seats are advantageously separated transversely by the central console 16. Each seat 20 includes a seat. Each seat 20 can be connected to the structure by slides (not shown) in order to adapt the longitudinal position in the passenger compartment 14. Each seat 20 can also include means for adjusting the height and inclination of the seat. seated.

There presents a seat 20 of a motor vehicle according to a first embodiment of the invention. The motor vehicle may correspond to that presented in relation to the . Seat 20 can be a front seat. It can be a left seat. A right seat can be deduced by symmetry.

The seat 20 comprises a lower frame 22 intended to be fixed to the structure of the vehicle, in particular via the slides. The lower frame 22 forms a fixing interface for the seat 20.

The seat includes a seat 24 and a backrest 26. The seat 24 is generally horizontal, and the backrest 26 vertical. The backrest 26 is elevated relative to the seat 24. The backrest 26 is optionally surmounted by a headrest 28. The headrest 28 vertically extends the backrest 26. It offers a vertical front surface for the head of 'an occupant. The backrest 26 is possibly pivotable relative to the seat 24.

The seat 20 further comprises an armrest 30. The armrest 30 is shown open in order to expose the organs it houses. The armrest 30 is elevated relative to the seat 24. It extends forward relative to the backrest 26. The armrest 30 extends over a longitudinal portion of the seat 24. The armrest comprises an upper body 34 with a support surface 36. The upper body 34 is in elevation relative to the seat 24. The upper body 34 can be vertically spaced from the seat 24. The support surface 36 is generally horizontal , it is capable of receiving an elbow from an occupant. The support surface 36 can be an upper support surface.

The armrest 30 further comprises an airbag safety device 40, commonly called an airbag. The airbag safety device 40 is integrated into the armrest 30. The airbag safety device 40 comprises inflation means 42, such as a pyrotechnic charge, and a waterproof envelope 44 forming an inflatable envelope. In the present figure, the waterproof envelope 44 is folded into a configuration favoring rapid and directed deployment. The waterproof envelope 44 is capable of being inflated in a fraction of a second, for example in 10 milliseconds, in order to form lateral protection for the occupant (not shown) of the seat. The armrest 30 is preferably a fixed armrest relative to the seat 24.

The backrest also has a lower portion 46, an upper portion 48 with a front surface 50, and a pivot connection 52 allowing rotation between the lower portion 46 and the upper portion 48. Thus, the upper portion 48 can tilt one quarter turn. The upper portion 48 pivots relative to the lower portion 46 between an upright position and a folded position at the level of the armrest 30. In the upright position, the upper portion is straight; and/or in the extension of the lower portion. The upper portion is movable between a vertical position and a horizontal position. The upper portion 48 includes a rear surface 49.

The lower portion 46 extending vertically at the level of the upper body 34, for example at the level of the airbag safety device 40. The upper surface 36 comprises a first rupture zone capable of being crossed by the airbag safety device 40 during its deployment. The first rupture zone is above the air bag safety device 40.

The invention splits the backrest 26 into two pivoting portions, and allows deployment of an airbag safety device 40 above the lower portion 46. In addition, the upper portion 48 folds at the level of the armrest 30. As a result, the seat 20 adopts a compact configuration once folded, and raises the starting level of the airbag. The invention gives a dual function to the space above the upper surface: deployment of the airbag safety device 40 and pivoting of the upper portion 48.

The height of the lower part indexes the height from which the airbag safety device 40 deploys, but also the zone from which the upper portion 48 of the backrest 26 folds. The deployment zone is smaller vertically, therefore the airbag safety device 40 deploys more quickly. The departure zone of the air bag safety system is raised; closer to the occupant's head. It covers the occupant’s sensitive upper limbs more quickly. By raising the folding area of the backrest, the latter folds into a more compact area. It is shorter, therefore easier to handle. This improves ergonomics.

There presents a seat 20 of a motor vehicle of the invention. The motor vehicle may correspond to that presented in relation to one of Figures 1 to 2.

The airbag safety device 40, more precisely the waterproof envelope 44, is shown in deployed configuration, unlike the is in folded configuration. The inflation means are not shown to simplify the present figure.

The waterproof envelope 44 is deployed in front of the front surface 50 of the upper portion 48 of the backrest 26. The waterproof envelope 44 extends above and/or from the pivot connection 52. The waterproof envelope 44 is vertically above and preferably at a distance from the lower portion 46. The waterproof envelope 44 extends above the bearing surface 36 of the upper body 34 of the armrest 30 in which it is installed.

The invention provides a pivot connection 52 in order to fold the backrest 26 in two parts in a compact manner by fitting the armrest 30. At the same time, the airbag safety device is capable of deploying above the pivot connection 52 The deployment zone of the airbag safety device 40 is vertically at the level of the zone swept by the upper portion 48 of the backrest 26. These zones coincide vertically. Concomitantly, the invention shortens the upper portion 48 and brings the airbag safety device 40 closer to the upper body of the occupant. Thus, the invention optimizes safety and ergonomics. In particular, the thorax is protected more effectively so that in the event of injuries, they will be of lesser importance.

There presents a seat 20 of a motor vehicle according to a second embodiment of the invention. The motor vehicle corresponds to that presented in relation to one of Figures 1 to 3. The seat 20 is identical or similar to that presented in ; however, it differs in that the airbag safety device 40 is inclined relative to the horizontal.

The support surface 36 of the upper body 34 of the armrest 30 is generally horizontal. It may be noticeably curved. The seat 20 has a horizontal direction 54, in particular in the longitudinal direction of the motor vehicle.

The air bag safety device 40 has a main elongation 56 which is the direction it comprises its greatest length. In the folded configuration, the inflation means 42 and the waterproof envelope 44 extend along the main elongation 56. The main elongation 56 is inclined relative to the horizontal direction 54 by a first angle A1 of between 20° and 50°. Angle A1 can be defined in a plane including the X and Z axes.

This arrangement allows forward deployment of the airbag safety device 40.

There presents an armrest 30 of a motor vehicle seat 20 according to the second embodiment of the invention. The air bag safety system is not shown for clarity.

The armrest 30 has a front panel 58 on the upper body 34. The front panel 58 is generally vertical, and generally perpendicular to the longitudinal direction 54.

The upper body 34 comprises a rupture zone 60 capable of being crossed by the airbag safety device. In detail, the upper surface 36 has a first rupture zone 62 capable of being crossed by the airbag safety device. The first rupture zone 62 presents a programmed line of fragility. It may be a line with a reduction in thickness inside the upper body 34. The first rupture zone 62 may be a lower rupture zone.

The rupture zone 60 also includes an auxiliary rupture zone 64 on the front panel 58. The auxiliary rupture zone 64 extends into the front panel 58 of the upper body 34. It extends the first rupture zone 62.

In the first embodiment, the rupture zone 60 may essentially comprise the first rupture zone 62; and replace the auxiliary break zone 64 with an extension of the first break zone 62 towards the rear.

There presents a seat 20 of a motor vehicle according to a third embodiment of the invention. The motor vehicle corresponds to that presented in relation to one of Figures 1 to 2. The seat 20 is identical or similar to that presented in ; it differs, however, in that the airbag safety device 40 is arranged in the backrest 26, in particular in the upper portion 48.

The backrest 26 is presented from the rear, an optional covering panel forming the rear surface of the upper portion 48 is removed in order to expose the interior of the backrest 26. The optional covering panel can extend from the lower portion 48 to the headrest (not visible). In the present embodiment, the main extension 56 is substantially in a vertical direction 66 of the seat 20. It can be parallel, or inclined by at most 15°, preferably by at most 10°, more preferably by at more than 5°, relative to a vertical direction 66 of the seat 20.

The airbag safety device 40 is housed in the upper portion 48 of the backrest 26, and above the upper body (not visible) as well as the lower portion 46. The airbag safety device 40 is above and preferably at a distance from the pivot connection 52.

The front surface (not visible) comprises a second rupture zone (not shown) capable of being crossed by the airbag safety device 40. The second rupture zone may include the characteristics of the first rupture zone described in relation to there . Each rupture zone can be a programmed zone of fragility.

In inflated configuration, the inflatable bag safety device 40, in particular its bag (not shown), can be as shown in .

There presents a seat 20 of a motor vehicle according to a fourth embodiment of the invention. Seat 20 is identical or similar to that presented in ; it differs, however, in that the airbag safety device 40 is arranged in the backrest 26, in particular in the upper portion 48.

As in , the backrest 26 is presented from the rear, being free of the covering panel. The motor vehicle may correspond to that presented in relation to one of the preceding figures.

The airbag safety device 40 is arranged in the upper portion 48 of the backrest 26. The airbag safety device 40 has a main elongation 56 inclined relative to the vertical direction 66 by a second angle A2 of between 30° and 60°. This inclination allows deployment by bypassing the thorax and shoulder of a seat occupant.

The upper portion 48 of the backrest 26 comprises a frame 70 and a fixing support 72 of the air bag safety device 40. The fixing support 72 is advantageously triangular. The mounting bracket 72 connects the airbag safety device 40 to the frame 70. The triangular shape makes it possible to tilt the airbag safety device 40 in an optimal orientation for the protection of the occupant. The fixing support 72 is hollowed out in order to lighten it.

There presents a seat 20 of a motor vehicle according to the invention. The motor vehicle may correspond to that presented in relation to one of the preceding figures. Backrest 26 is in folded configuration. The upper portion 48 is horizontal, it runs along the upper surface 36 of the upper body 34 of the armrest 30. The rear surface 49 of the upper portion is generally horizontal now.

The headrest 28 is also retracted. It is folded down. The headrest 28 faces downwards; towards the lower portion 46 of the backrest 26. It approaches the seat 24. The headrest 28 extends vertically along the armrest 30; preferably of the upper body 34. The configuration is compact.

There presents a part of the passenger compartment 14 of a motor vehicle. The motor vehicle may correspond to that presented in relation to one of the preceding figures. The passenger compartment part has two seats 20. At least one of the seats 20 or each seat 20 may be similar or identical to those described in relation to one of the preceding figures. They can be symmetrical.

Seat 20 on the right; in the vehicle repository; is in the folded configuration, and the left seat 20 is in the deployed configuration.

It is remarkable that for the right seat 20 which is folded down, the rear surface 49 of the upper portion 48 is flush with the upper area 18 of the central console 16. Thus, the combination of the central console 18 and at least one Folded seats provide an extended work surface.

The motor vehicle comprises a side wall 15, preferably two side walls 15 delimiting the passenger compartment 14. For each seat 20, the airbag safety device 40 is on the side of the associated side wall 15. The waterproof envelope 44 is then able to deploy transversely between the upper portion 48 of the backrest 26 and the side wall 15.

Generally speaking, in the folded position the rear surface 49 is vertically at the level of the upper area 18. They can be parallel. They can be substantially coplanar, or at most vertically 10 cm apart, preferably 5 cm.

As seen on the left seat whose backrest 26 is straightened, the upper portion 48 of the backrest 26 comprises a lower section 74 and an upper section 76. The upper section 76 being narrower than the lower section 74. This aspect allows a reduction in the seat 20, and better visibility from the rear seats of the motor vehicle.

On the left seat 20, the front surface 50 comprises a second rupture zone 80 (shown in dotted lines) capable of being crossed by the air bag safety device 40. The second rupture zone 80 generally extends vertically. It is elevated relative to armrest 30 on the left side. The second rupture zone 80 may be an upper rupture zone.

Claims (10)

Seat (20) of a motor vehicle (10), the seat (20) comprising a seat (24), a backrest (26) with a lower portion (46), an airbag safety device (40) capable of protecting a occupant of said seat (20), an armrest (30) comprising an upper body (34) with a support surface (36), characterized in that the backrest (26) further comprises a pivot connection (52) and a portion upper portion (48) with a front surface (50), the upper portion (48) pivoting relative to the lower portion (46) between an upright position and a folded position at the level of the armrest (30), the lower portion ( 46) extending vertically at the level of the upper body (34); the airbag safety device (40) being arranged in the upper body (34) of the armrest (30) and the upper surface (36) comprises a first rupture zone (62) capable of being crossed by the airbag safety device (40) air bag safety (40); or the airbag safety device (40) being disposed in the upper portion (48) of the backrest (26) and, the front surface (50) comprises a second rupture zone which is capable of being crossed by the safety device air bag (40) and which extends above the upper surface (36). Seat (20) according to claim 1, characterized in that the airbag safety device (40) is arranged in the upper body (34), the upper body (34) also comprising a front panel (58), the first rupture zone (62) extending into the front panel (58) of the upper body (34). Seat (20) according to claim 2, characterized in that the seat (20) comprises a horizontal direction (54), the airbag safety device (40) has a main elongation (56) inclined relative to the horizontal direction of a first angle (A1) between 20° and 50°. Seat (20) according to claim 1, characterized in that the airbag safety device (40) is arranged in the upper body (34), the airbag safety device (40) has a main elongation (56) arranged horizontally and parallel to the support surface (36). Seat (20) according to claim 1, characterized in that the airbag safety device (40) is arranged in the upper portion (48) of the backrest (26) and has a main extension (56) arranged vertically. Seat (20) according to claim 1, characterized in that the seat (20) comprises a vertical direction (66), the airbag safety device (40) is arranged in the upper portion (48) of the backrest (26) , the airbag safety device (40) has a main elongation (56) inclined relative to the vertical direction (66) by a second angle (A2) of between 30° and 60°. Seat (20) according to claim 6, characterized in that the upper portion (48) of the backrest (26) comprises a frame (70) and a triangular fixing support (72), the air bag safety device (40) being fixed to the frame (70) via the fixing support (72). Seat (20) according to one of claims 1 to 7, characterized in that the seat (20) comprises a reclining headrest (28) connected to the upper portion (48) of the backrest (26), the seat (20) ) being configured to be in a retracted configuration in which the upper portion (48) is in the folded position and in which the headrest (28) is folded vertically at the level of the upper body (34) of the armrest (30) . Motor vehicle (10) comprising a seat (20) characterized in that the seat (20) conforms to one of claims 1 to 8, the motor vehicle (10) comprises a side wall (15), the safety device with an inflatable bag (40) being on the side of said side wall (15) and being able to deploy transversely between the upper portion (48) of the backrest (26) and the side wall (15). Motor vehicle (10) according to claim 9, characterized in that the motor vehicle (10) comprises a central console (16) with an upper area (18), and the upper portion (48) of the backrest (26) comprises a surface rear (49); in the folded position, the rear surface (49) is vertically level with the upper area (18).