Vehicle seat

Abstract

The invention relates to a vehicle seat (1) having at least one seat assembly (2) with a support structure (3) and two side parts (5, 6) molded on a seat surface (4). Wherein the at least one seat assembly (2) has a width adjustment mechanism (7) for adjusting the width of the seat surface (4) of the seat assembly (2), and an angle adjustment mechanism (8), which is coupled to the width adjustment mechanism (7), for adjusting the positioning angle of the at least one side part (5, 6) of the seat assembly (2).

Description

TECHNICAL FIELD

[0001] Vehicle seats in vehicles usually have a plurality of seat components, in particular a seat cushion (seat squab), if appropriate with a laterally molded side cushion, and a backrest or back squab, if appropriate with a laterally molded side part. BACKGROUND

[0002] In order to stabilize the vehicle seat, in particular taking into account the forces acting on the vehicle seat when the vehicle is in motion, the seat components of the vehicle seat usually also have a load-bearing structure as a support structure.

[0003] According to DE 10 2007 047 840 A1, a seat arrangement for a vehicle is known, the lateral support sections of which can be moved inwards and outwards predictively by means of a drive arrangement depending on the road profile.

[0004] A regulating device for regulating a seat side part is described in DE 10 2007 009 891 A1. The regulating device comprises a regulating element coupled to the side part, a support for mechanically supporting the regulating element, and an inflatable air bag for positioning the regulating element relative to the support when the side part is being regulated.

[0005] A vehicle seat arrangement with a foldable seat squab for getting in and out of the vehicle is described in DE 10 2014 210 790 A1. The seat squab extends laterally from the seat base or the backrest of the vehicle seat and has a squab support with a hinge device, an abutment element and a meshing surface arranged therebetween. A spring-preloaded dynamic element coupled to the backrest or the seat base can be moved into a folded position for getting in and out of the vehicle.

[0006] According to DE 20 2004 013 668 U1, a motor vehicle seat is known, which has an adjustable side part on the seat squab and / or the backrest. The length of the side part and its orientation relative to the central seat region and / or the backrest region can be changed by a combined adjustment of the side part, in particular by means of a combined linear and rotary guide rail, resulting in a controllable trajectory movement.

[0007] Furthermore, the relevant patent literature also includes DE 10 2016 204 067 A1 and DE 196 05 779 C2.

[0008] Further, the same type JP 2005 206 027 A shows a vehicle seat having at least one seat assembly with a carrier structure and two side parts molded on a seat surface, wherein the at least one seat assembly has a width adjustment mechanism for adjusting the width of the seat surface of the seat assembly and an angle adjustment mechanism coupled with the width adjustment mechanism for adjusting the positioning angle of at least one side part of the seat assembly; wherein the width adjustment mechanism of each seat assembly has two pairs of crossbars arranged spaced apart from each other and connected with the carrier structure of the seat assembly, the pairs of crossbars each having two crossbars, wherein a fixed part of each crossbar is connected with the carrier structure of the seat assembly and a movable part of each crossbar movable over a certain movement stroke is connected with one of the two side parts of the seat assembly, and each crossbar has a hinge element which, when the crossbar is moved, cooperates with a turning element mounted on the fixed part of the crossbar to form the angle adjustment mechanism, wherein the turning element on the fixed part of each crossbar is arranged in a turning position corresponding to the typical movement stroke of the movable part of each crossbar. SUMMARY

[0009] It is an object of the present application to provide a vehicle seat which enables a support function and / or a holding function for an occupant on the vehicle seat to be realized in a simple manner and with advantageous properties.

[0010] According to the application, this object is achieved by a vehicle seat having the features of patent claim 1.

[0011] Advantageous refinements of the vehicle seat according to the application are the subject matter of the further patent claims.

[0012] In the vehicle seat according to the application, the seat surface width modification of a particular seat assembly of the vehicle seat is achieved by narrowing or widening the seat surface, also commonly referred to as "seat plane", between the two side parts of the seat assembly, by means of a width adjustment mechanism which is preferably driven by an electric motor.

[0013] In particular, the seat surface width modification of the seat surface of a vehicle seat having two molded side parts is achieved by narrowing or widening the seat surface of the seat cushion, and / or the seat surface width modification of the backrest surface of a vehicle seat having two molded side parts is achieved by narrowing or widening the seat surface of the seat backrest.

[0014] The width adjustment mechanism for adjusting the seat surface width of the respective seat assembly is coupled to the angle adjustment mechanism or the folding mechanism. By means of the angle adjustment mechanism, the positioning angle / adjustment angle (Anstellwinkel) of the at least one side portion molded on the seat surface of the respective seat assembly can be adjusted by means of the folding mechanism. In particular, the width adjustment mechanism of the seat surface of the respective seat assembly is coupled to the angle adjustment mechanism or the folding mechanism of the two side portions of the respective seat assembly by means of a force-guiding device.

[0015] The angle adjustment mechanism or the folding mechanism for folding the two side portions of the seat assembly is in particular only active when the width adjustment of the seat surface of the respective seat assembly exceeds a certain extent, that is to say, when the adjustment of the seat surface width of the respective seat assembly reaches a certain movement path, the angle adjustment mechanism for folding the two side portions of the seat assembly is triggered.

[0016] The width adjustment mechanism of the respective seat assembly has two pairs of crossbars which are arranged at a distance from one another and which are connected to the carrier structure of the seat assembly, the pairs of crossbars each having two crossbars. Here, the crossbars are connected to the carrier structure of the seat assembly by means of a fixed portion and to one of the two side portions of the seat assembly by means of a movable portion which can be moved by a certain movement path. Thus, two crossbars are connected to one of the side portions molded on the seat surface of the seat assembly and the other two crossbars are connected to the other side portion molded on the seat surface of the seat assembly. The movable portion of each crossbar has a hinge, for example a rotary hinge or a hinge designed as a hinge leaf, which cooperates with a deflection element mounted on the fixed portion of the crossbar to form an angle adjustment mechanism when the movable portion of the crossbar is moved. In particular, the angle adjustment mechanism is triggered and the folding process of the side portions of the seat assembly is initiated if the hinge mounted on the movable portion of the crossbar reaches a deflection position corresponding to one third of the total possible movement path of the movable portion of the crossbar, the deflection element being arranged in this deflection position on the fixed portion of the crossbar.

[0017] The deflection position is for example determined and set by positioning the deflection element on the fixed portion of the crossbar in such a way that the angle adjustment mechanism is triggered and the folding process of the side portions of the respective seat assembly is initiated when the movement path of the movable portion of the crossbar reaches one third of the total possible movement path of the movable portion of the crossbar. Thus, within one third of the total possible movement path of the movable portion of the crossbar, only a pure width adjustment or widening of the seat surface of the respective seat assembly takes place, that is to say, only a widening of the seat surface of the respective seat assembly takes place; within the remaining movement path of the movable portion of the crossbar, however, a width adjustment of the respective seat assembly and an angle adjustment of the at least one side portion of the respective seat assembly take place, that is to say, a widening of the seat surface of the respective seat assembly and a folding of the two side portions of the respective seat assembly take place.

[0018] Thus, when a width change of the seat surface of the seat assembly of the vehicle seat is carried out in a necessary case, the positioning angle of the two side portions of each seat assembly can also change in consequence. Thereby, a safe support of the entire torso or even the entire body of the vehicle occupant located on the vehicle seat is provided, and this stability thus extends up to the shoulder and head region of the occupant, which is particularly advantageous when the vehicle is involved in a crash.

[0019] Due to the close fit of the body of the vehicle occupant located on the vehicle seat to each seat assembly, the heat transfer of the seat heating device designed for each seat assembly to the occupant is also improved, and thereby the efficiency of the seat heating device is increased.

[0020] Furthermore, the position or angular position set by the width adjustment of each seat assembly and the angle adjustment of the two side portions of each seat assembly will remain unchanged until another position or angular position is set by a subsequent activation of the width adjustment mechanism.

[0021] When a corresponding width change is carried out to narrow each seat assembly, i.e. to narrow the seat surface of each seat assembly, in the case of a folded side portion of the seat assembly, the side portions of each seat assembly will be folded away or folded back, contrary to the folding process of the side portions of each seat assembly.

[0022] To implement the angle adjustment mechanism, i.e. the folding mechanism, each seat assembly preferably has two longitudinal rods arranged on one seat half of each seat assembly, and a plurality of elastic tensioning elements parallel to the pairs of transverse rods, which have a certain elasticity and are in particular configured as springs. One end of these elastic tensioning elements is connected to each longitudinal rod connected to the transverse rod fixed part and thus not movable, and the other end is connected to the longitudinal rod connected to the transverse rod movable part or in other words forming the outer contour of the side portion of the seat assembly and thus foldable.

[0023] Thereby, with the aid of the turning element and the elastic tensioning element, a forced guidance of the movable part of the transverse rod can be achieved during the folding process of the two side portions of each seat assembly when the travel of the movable part of the transverse rod exceeds the turning position.

[0024] Here, each seat half of each seat assembly is preferably provided with at least three such elastic tensioning elements, for example three or four springs having a certain spring strength and being equidistantly distributed on each seat half of each seat assembly.

[0025] Advantageously, the support points or support surfaces of the seat cushion of each seat assembly can also be formed by these elastic tensioning elements, for example by the springs as elastic elements, so that it is not necessary to equip each seat assembly with a separate spring frame.

[0026] The elasticity of the elastic tensioning elements, in particular the spring constant of the elastic tensioning elements configured as springs, is to be selected here in such a way that it has the pre-set properties in terms of ride comfort and angle adjustment. In particular, the specific seat cushion softness of the individual seat assemblies of the vehicle seat is thereby set, which also provides the necessary stiffness for the folding process of the two side portions of the individual seat assemblies of the vehicle seat.

[0027] These elastic tensioning elements, in particular configured as springs, thus ensure, on the one hand, a kind of pincer movement during the folding process of the two side portions of the seat assemblies of the vehicle seat, so that the occupant sitting on the vehicle seat is almost enveloped by the two sides of the folded side portions, and, on the other hand, provide a certain softness of the seat cushion of the individual seat assemblies of the vehicle seat and form a corresponding support surface for the seat cushion of the individual seat assemblies of the vehicle seat.

[0028] In another preferred embodiment of the application, at least one such elastic tensioning element, in particular at least one elastic tensioning element configured as a spring, is also arranged between the two longitudinal rods connected to the crossbar fixing portion of one crossbar pair, i.e. between two longitudinal rods located on one seat half of the seat assembly and adjacent to each other.

[0029] In another preferred embodiment of the application, the width adjustment mechanism is integrated in both crossbar pairs by a motor-driven adjustment drive for moving the movable portions of the two crossbars of the respective crossbar pair.

[0030] The two motor-driven adjustment drives arranged centrally in the individual seat assemblies are thus intended to enable a width change of the individual seat assemblies by narrowing or widening the seat surface of the individual seat assemblies of the vehicle seat.

[0031] In particular, a synchronous and simultaneous movement of the movable portions of all crossbars is thereby carried out, i.e. a synchronous and simultaneous movement of the two movable portions of each crossbar arranged on one seat half of the individual seat assemblies and connected to one molded side portion of the individual seat assemblies.

[0032] Preferably, an electric motor with a differential is provided in each adjustment drive. The adjustment drive can be designed as a spindle drive, in particular with a movable spindle, if necessary with a gear unit and a brake.

[0033] By means of the adjustment drive, a synchronous and simultaneous movement of the movable portions of the crossbars of the individual seat assemblies is thereby carried out. By means of the brake, in particular, this movement of the movable portions of the crossbars on the two seat halves of the seat assemblies of the vehicle seat can be controlled.

[0034] Thus, the side portions on both sides of the vehicle seat are folded synchronously, in particular the side cushions on both sides of the vehicle seat or the side portions of the backrest of the vehicle seat are folded synchronously.

[0035] It can be provided here that, when the vehicle is subjected to high acceleration forces or a collision occurs, the two side portions of the seat assembly of the vehicle seat are folded automatically to the greatest extent, so that the side portions on both sides of the seat assembly of the vehicle seat are also folded automatically to the greatest extent.

[0036] Since the seat width of each seat assembly is changed during the movement of the crossbar movable part, i.e. the seat surface is moved or displaced inwards towards the centre of the seat or moved or displaced outwards from the centre of the seat, it can be provided that the seat assembly of the vehicle seat is made of a resilient material which can be deformed in accordance with the movement of the seat surface of the seat assembly.

[0037] That is to say, the seat surface of each seat assembly of the vehicle seat, in particular the seat surface of the seat cushion of the vehicle seat and / or the seat surface of the backrest of the vehicle seat, is preferably made of a resilient material which can be deformed in accordance with the movement stroke of the crossbar movable part. Thus, by narrowing or widening the seat surface of the seat assembly of the vehicle seat and the movement of the seat surface of the seat assembly of the vehicle seat corresponding thereto, the resilient material of the seat surface of each seat assembly of the vehicle seat can also adapt to the change in the seat width of the seat assembly of the vehicle seat.

[0038] In the manual mode, the width adjustment mechanism is activated by an occupant sitting on the vehicle seat operating a control element, and the angle adjustment mechanism associated therewith is likewise activated if necessary. The control element can be designed, for example, as a rotary knob, a push button or a push lever, by means of which the occupant of the vehicle can individualize the seat width of each seat assembly of the vehicle seat and the angular position of the side portions on both sides of each seat assembly of the vehicle seat.

[0039] Alternatively, in an automatic mode, the width adjustment mechanism can be activated automatically, and thus, if necessary, the angle adjustment mechanism coupled thereto, in particular by control of a control device associated with the vehicle seat. In the automatic mode, the width adjustment mechanism can be activated automatically, and thus, if necessary, the angle adjustment mechanism coupled thereto, in particular in dependence on an acceleration force acting on the vehicle and thus on the vehicle seat. In the automatic mode, the respective width adjustment mechanism is actuated in dependence on a sensor signal or an acceleration sensor signal, and thus in dependence on a current lateral acceleration and / or longitudinal acceleration of the vehicle, for a simultaneous and identical length change of the two crossbars of the frame-like carrier structure of the seat assembly. As already mentioned, in particular in the case of relatively high acceleration forces acting on the vehicle and in the case of a crash, the width adjustment of the respective seat assembly, i.e. the widening of the seat surface of the respective seat assembly, and the angle adjustment of the two side portions of the respective seat assembly coupled thereto, i.e. the folding of the two side portions of the respective seat assembly, will be activated automatically.

[0040] In a preferred embodiment of the application, length adjustment mechanisms can also be integrated in the two side portions of the vehicle seat assembly, in particular in the two side bolsters of the vehicle seat cushion and / or in the two side portions of the vehicle seat backrest. The length adjustment mechanisms located in the two side portions of the vehicle seat assembly are designed for a simultaneous and identical height adjustment of the two side portions of the seat assembly of the vehicle seat, in particular of the two side bolsters of the vehicle seat cushion and / or of the two side portions of the vehicle seat backrest, so that the height of the seat assembly of the vehicle seat can be adapted to the body size of the vehicle occupant located on the vehicle seat.

[0041] The respective length adjustment mechanism can have an electric motor integrated in or associated with the side portion of the seat assembly of the vehicle seat for the adjustment.

[0042] The vehicle seat can be designed for various types of vehicles, in particular also for autonomous vehicles, in which the vehicle occupant can select a variable seat position in the vehicle in autonomous driving mode.

[0043] By means of the width adjustment mechanism and the angle adjustment mechanism coupled thereto according to the application, a simple device enables a rapid width change of the seat surface of the seat assembly and the angle change coupled thereto, and thus the folding of the two side portions of the respective seat assembly, in particular a rapid width change of the seat surface of the vehicle seat cushion and / or of the seat surface of the vehicle seat backrest and the angle change coupled thereto, and thus the folding of the side bolsters of the vehicle seat cushion and / or of the side portions of the vehicle seat backrest.

[0044] Thus, the entire torso of a vehicle occupant seated on the vehicle seat is kept stable in the vehicle seat when the vehicle is in various driving states or various driving maneuvers are performed, so that the vehicle occupant is reliably supported in the vehicle seat.

[0045] This active wrapping of a vehicle occupant seated on the vehicle seat by folding the two side portions of the seat assembly of the vehicle seat is particularly effective in the event of a collision risk of the vehicle and also provides good lateral support for a vehicle occupant seated on the vehicle seat in an autonomous driving mode. Furthermore, the heat transfer from the vehicle seat to the vehicle occupant is effective for vehicle seats equipped with a seat heating function, so that only a small heating power is required for the seat heating.

[0046] Further advantages, features and details of the application are given in the following description of preferred embodiments and with reference to the drawings. The above-mentioned features and combinations of features mentioned in the description and the features and combinations of features mentioned in the description of the drawings and / or shown alone in the drawings can be used not only in the respective combinations indicated, but also in other combinations or alone without departing from the scope of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0047] wherein:

[0048] Figure 1 A schematic view of a backrest carrier structure of a vehicle seat backrest with width adjustment mechanism and angle adjustment mechanism is shown.

[0049] Figure 2 A partial view of a backrest carrier structure of a vehicle seat backrest is shown, containing a detailed view of the width adjustment mechanism and the angle adjustment mechanism in the stowed / retracted position.

[0050] Figure 3 A partial view of a backrest carrier structure of a vehicle seat backrest is shown, containing a detailed view of the width adjustment mechanism and the angle adjustment mechanism in the stowed / retracted position.

[0051] Figure 4 A schematic view of a seat cushion and a backrest carrier structure of a vehicle seat backrest is shown. DETAILED DESCRIPTION

[0052] In the following, an embodiment of a vehicle seat backrest or back cushion will be described, wherein the explanations and explanations relating thereto can be transferred analogously to a seat cushion of a vehicle seat.

[0053] According to Figure 1The vehicle seat 1 has, in addition to a seat cushion not shown, a seat back 2 or back cushion as a seat component 2, which has two side parts 5, 6 molded on both sides of a seat surface 4 of the seat back 2. Thus, the side part 5 on one seat half 17 of the seat back 2 is molded with the seat surface 4 of the seat back 2; the side part 6 on the other seat half 18 of the seat back 2 is molded with the seat surface 4 of the seat back 2.

[0054] In the seat back (or back cushion) 2 of the vehicle seat 1, a seat back carrier structure 3 is integrated, which serves to stabilize the structure of the vehicle seat 1 or the seat back 2.

[0055] Furthermore, two crossbar pairs 9, 10 are provided, which are arranged spaced apart from one another, each crossbar pair having two crossbars 11. Here, the crossbars 11 have a fixed part 12, which has a swivel element as a swivel element 15 mounted in a specific swivel position, and a movable part 13, which is movable along a specific movement path, having a hinge 14.

[0056] In both crossbar pairs 9, 10, i.e. in the upper crossbar pair 9, which is located in the upper region of the seat back carrier structure 3 and has two respective crossbars 11, and in the lower crossbar pair 10, which is located in the lower region of the seat back carrier structure 3 and has two respective crossbars 11, a width adjustment mechanism 7 is integrated centrally. By means of the width adjustment mechanism 7, a movement or displacement of the movable part 13 of the crossbars 11 of the crossbar pairs 9, 10 can be effected, so that a bidirectional movement of the movable part 13 of the crossbars 11 is possible: a movement from the outside to the inside, i.e. in the direction of the center of the seat back 2 of the vehicle seat 1, or a movement from the inside to the outside, i.e. in the direction of the respective side part 5, 6 of the seat back 2 of the vehicle seat 1. As a result of this, the width of the seat surface 4 located between the two side parts 5, 6 of the seat back 2 of the vehicle seat 1 also changes, i.e. the seat back 2 of the vehicle seat 1 is thereby narrowed or widened.

[0057] Figure 1 The situation shown in Fig. 2 is that the movable parts 13 of all crossbars 11 of the two crossbar pairs 9, 10 are displaced from the inside to the outside, i.e. in the direction of the respective side part 5, 6 of the seat back 2 of the vehicle seat 1, by a specific movement path, i.e. are in the extended position.

[0058] When the movable parts 13 of the crossbars 11 of the crossbar pairs 9, 10 have exceeded the specific movement path, i.e. when the swivel position specified by the roller or swivel element as a swivel element 15 is reached, the angle adjustment mechanism 8 comes into play, which causes the two side parts 5, 6 of the seat back 2 of the vehicle seat 1 to be folded. The angle adjustment mechanism 8 comes into play by means of the movement of the hinge 14 on the movable part 13, in combination with the swiveling at the roller / swivel element as a swivel element 15 and as a result of the spring tension of the plurality of springs as elastic tensioning elements 16, which are tensioned between the fixed longitudinal bars 19 and the movable longitudinal bars 20, which form the outer contour of the two side parts 5, 6 of the seat back 2 of the vehicle seat 1.

[0059] For example, three such springs as elastic tensioning elements 16 are provided between the fixed longitudinal rods 19 and the movable longitudinal rods 20 on each seat half 17, 18 of the backrest 2 of the vehicle seat 1. In addition, such springs 22 can also be arranged as elastic tensioning elements between two fixed longitudinal rods 19.

[0060] In the folding process of the two side portions 5, 6 of the backrest 2 of the vehicle seat 1, in order to support the folding movement of the two side portions 5, 6 of the backrest 2 of the vehicle seat 1, a sleeve 28 is provided within the frame of the backrest carrier structure 3.

[0061] In order to implement the width adjustment mechanism 7 and the angle adjustment mechanism 8 coupled thereto and thus to move the movable portion 13 of the crossbar 11, an adjustment drive 23 with an electric motor 24 and a plurality of spindle drives 25 is provided for each crossbar pair 9, 10 centrally arranged in the middle of the respective link pair 9, 10.

[0062] In order to adjust the height of the two side portions 5, 6 of the backrest 2 of the vehicle seat 1, a corresponding length adjustment mechanism 26 can be provided. As a result, the two side portions 5, 6 of the backrest 2 of the vehicle seat 1 can be changed in height synchronously and in the same direction.

[0063] Figure 2 A detailed view of the fully retracted state of the movable portion 13 of the respective crossbar 11 is shown in Fig. 6.

[0064] In the fully retracted state of the movable portion 13 of the respective crossbar 11, the movable portion 13 of the crossbar 11 is not turned and, as a result, the two side portions 5, 6 of the backrest 2 of the vehicle seat 1 are also not narrowed due to the elongation of the springs as elastic tensioning elements 16.

[0065] As a result, a secure and snug wrap of the vehicle occupant 27 located on the vehicle seat 1 is also not possible.

[0066] In the position of the fully retracted state, the springs as elastic tensioning elements 16 have been pre-tensioned for the next extension of the movable portion 13 of the crossbar 11.

[0067] Figure 3 A detailed view of the fully extended state of the movable portion 13 of the respective crossbar 11 is shown in Fig. 7.

[0068] In the fully extended position of the movable portion 13 of the respective crossbar 11, the full folding of the two side portions 5, 6 of the backrest 2 of the vehicle seat 1 is achieved by means of the angle adjustment mechanism 8. This angle adjustment mechanism 8 is triggered when the movable portion 13 of the crossbar 11 passes the turning position specified by the roller / deflector as turning element 15.

[0069] When the movable sections 13 of the respective cross bars 11 are in the fully extended state, i.e. the movable sections 13 of the respective cross bars 11 have reached the maximum stroke of movement, a maximum narrowing of the two side portions 5, 6 of the backrest 2 of the vehicle seat 1 is achieved by the turning of the movable sections 13 of the cross bars 11 at the rollers / deflectors as turning elements 15 by means of the hinges 14 and due to the spring tension resulting from the retraction of the springs as elastic tensioning elements 16, so that a firm and snug wrapping of the vehicle occupant 27 located on the vehicle seat 1 is achieved.

[0070] According to Figure 3 the fully extended state of the movable sections 13 of the respective cross bars 11, a maximum narrowing of the two side portions 5, 6 of the backrest 2 of the vehicle seat 1 is also associated with a corresponding strong bending of the seat cushion 21 on the backrest carrier structure 3. Figure 4 In

[0071] According to Figure 4 the maximum narrowing of the two side portions 5, 6 of the backrest 2 of the vehicle seat 1 achieved when the movable sections 13 of the respective cross bars 11 are in the fully extended state is also associated with a corresponding strong bending of the seat cushion 21 on the backrest carrier structure 3.

Claims

1. Vehicle seat (1) with at least one seat component (2) which has a carrier structure (3) and two side parts (5, 6) which are moulded on a seat surface (4), wherein The at least one seat assembly (2) has a width adjustment mechanism (7) for adjusting the width of the seat surface (4) of the seat assembly (2) and an angle adjustment mechanism (8) coupled to the width adjustment mechanism (7) for adjusting the positioning angle of at least one of the side portions (5, 6) of the seat assembly (2); wherein the width adjustment mechanism (7) of each seat assembly (2) has two pairs of crossbars (9, 10) arranged at a distance from each other and connected to the carrier structure (3) of the seat assembly (2), each pair of crossbars (9, 10) having two crossbars (11), wherein a fixed portion (12) of each crossbar (11) is connected to the carrier structure (3) of the seat assembly (2) and a movable portion (13) of each crossbar (11) movable by a certain movement stroke is connected to one of the two side portions (5, 6) of the seat assembly (2), and the movable portion (13) of each crossbar (11) has a hinge (14) which, when the crossbar (11) is moved, cooperates with a steering element (15) mounted on the fixed portion (12) of each crossbar (11) to form the angle adjustment mechanism (8), wherein the steering element (15) located on the fixed portion (12) of each crossbar (11) is arranged in a steering position corresponding to the typical movement stroke of the movable portion (13) of each crossbar (11), characterized in that To form the angle adjustment mechanism (8), each seat assembly (2) has a plurality of elastic tensioning elements (16) oriented parallel to each crossbar (11) of the two pairs of crossbars (9, 10), and each two longitudinal bars (19, 20) arranged on a seat half (17, 18) of each seat assembly (2), and one end of the elastic tensioning elements (16) is respectively connected to the fixed longitudinal bars (19) connected to the fixed portion (12) of the crossbar (11), and the other end of the elastic tensioning elements (16) is respectively connected to the movable longitudinal bars (20) connected to the movable portion (13) of the crossbar (11).

2. Vehicle seat (1) according to claim 1, characterized in that The elastic tensioning elements (16) form a support surface of a seat cushion (21) of the seat assembly (2).

3. Vehicle seat (1) according to claim 1, characterized in that At least one elastic tensioning element (22) is arranged between the two fixed longitudinal bars (19) connected to the fixed portion (12) of the crossbar (11) of the pair of crossbars (9, 10).

4. Vehicle seat (1) according to any one of the preceding claims, characterized in that In each of the two pairs of crossbars (9, 10), an adjustment drive (23) driven by an electric motor is integrated for moving the movable portion (13) of the two crossbars (11) of each pair of crossbars (9, 10).

5. Vehicle seat (1) according to any one of the preceding claims, characterized in that in each of the two side portions (5, 6) of the seat assembly (2) a length adjustment mechanism (26) is integrated for simultaneously and identically adjusting the height of the two side portions (5, 6) of the seat assembly (2).

6. Vehicle seat (1) according to any one of the preceding claims, characterized in that as the seat assembly (2) of the vehicle seat (1) a seat cushion with side cushions as side portions and / or the backrest (2) with sides as the side portions (5, 6) is provided.

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