DE102023106596A1 - Vehicle seat and method for assembling it - Google Patents

Abstract

The invention relates to a vehicle seat (1) having a structural frame (6), a backrest (2) and a seat part (3), the backrest (2) having a lower part (8) and an upper part (7), the upper part (7) having an upper cushion body (15) and a headrest (4) integrated therein and the lower part (8) having a support structure (11), a lower cushion body (9), support wires (19) for supporting the lower cushion part (9) and functional components (24). According to the invention, the lower part (8) of the backrest (2) has an upper fastening part (10a) and a lower fastening part (10b) and the lower part (8) is fixed to the structural frame (6) via these fastening parts (10a, 10b) independently of the upper part (7), the lower part (8) being fixed to the structural frame (6) in a non-destructive manner and detachable.

Description

The invention relates to a vehicle seat with a backrest, wherein a lower part of the backrest is of modular design, and to a method for assembling the vehicle seat.

Vehicle seats generally have several components, in particular a seat part, a backrest and a headrest, which are attached to a structural frame of the vehicle seat. The seat part and the backrest each have a cushioned body with a continuous support surface for the seat occupant, the support surface being ergonomically shaped and held on a support structure of the respective component. The headrest also has a correspondingly designed cushioned body. The individual components are then attached separately and independently of one another to the structural frame via the support structure.

When manufacturing the aforementioned components, in particular the upholstery body, a specific shape is generally chosen, which, however, is not equally optimal for every seat occupant in terms of ergonomics. In particular, the stiffness or flexibility of the upholstery material is predetermined and cannot subsequently be adapted to the individual properties such as weight and dimensions of a different or changing seat occupant. Any functional components that may be present are also specified.

The US6811227B2 discloses a vehicle seat with a structural frame via which the vehicle seat is connected to the vehicle, as well as with a backrest and a seat part, which are fixed to the structural frame. Additional dampers are installed in both the seat part and the backrest in order to increase the comfort for a seat occupant.

The US7775603 describes a spring system for a seat part of a vehicle seat, wherein the spring system is fixed to the structural frame of the vehicle seat.

The EP3543124 discloses a cover for a vehicle seat, wherein the cover has upholstery bodies and functional components which can be fixed to a structural frame of a vehicle seat by means of a supporting structure.

The US10974634B2 discloses a vehicle seat, wherein a holding structure is provided for the cushion body of the backrest, which allows an exchange of the cushion body of the backrest attached to the holding structure.

Such designs sometimes make it possible to replace individual components of the vehicle seat, including the upholstery. This makes it possible to adapt a vehicle seat to the individual wishes and needs of a seat occupant. However, this means that the respective components of the vehicle seat are completely replaced, which is usually quite complex and expensive, especially in the case of vehicle seats where the headrest is integrated into the backrest.

The invention is therefore based on the object of providing a vehicle seat with a backrest which enables the backrest to be easily and inexpensively adjusted to the respective seat occupant. The object is also to provide a method for mounting the vehicle seat.

These objects are achieved by a vehicle seat and a method according to the independent claims. The subclaims describe preferred developments.

Thus, a vehicle seat is provided, having a structural frame, a backrest and a seat part, wherein the backrest has a lower part and an upper part, wherein the upper part has an upper cushion body and a headrest integrated or accommodated therein, wherein the upper cushion body surrounds the headrest and is therefore not part of the headrest itself, and wherein the lower part has a support structure, a lower cushion body, support wires for supporting the lower cushion part and functional components. The structural frame which holds the individual components of the vehicle seat preferably consists of metal struts or molded parts and is connected to the body of the vehicle in a well-known manner, for example via a rail system. According to the invention, it is provided that the lower part of the backrest has an upper fastening part and a lower fastening part and the lower part is fixed to the structural frame via these fastening parts independently of the upper part, wherein the lower part is fixed to the structural frame in a non-destructively detachable or non-destructively removable manner.

Advantageously, unlike the vehicle seats of the state of the art mentioned at the beginning, it is possible to arrange only the crucial component of the backrest, the lower part, on the structural frame in a simple and exchangeable manner. A modular and prefabricated lower part, which is adapted to the respective seat occupant, can therefore be provided and then easily assembled without tools and without replacing the entire backrest. In this way, the relevant lower area of the backrest, which is mainly subjected to stress by seat occupants with different weights and different anatomies, can be adjusted and made available separately, which saves effort and costs. Subsequent replacement for a different occupant or a change in the occupant is also possible easily and without tools. Preferably, the non-destructively detachable or removable fixation of the lower part can be designed by a clip connection and/or a locking connection between the lower part and the structural frame. However, snapping, clamping or a combination of the above-mentioned types of connection is also possible. It is important that the fixation is reversible, whereby reversible in this case means non-destructive release of the fixation without special tools.

The lower area of a backrest, which in the invention is formed by the lower part, is usually subjected to particularly high stress, since the driver's seat occupant is permanently seated in this area. As a result, this area is subject to increased stress and increased wear. This area also usually contains functional components that serve to improve comfort, so that these can also be specifically adjusted and/or replaced without replacing the entire backrest. It can preferably be provided that the lower part, as a modular, prefabricated unit, has the following functional components: a lumbar support and/or an adjustment system for the side bolsters and/or a massage system and/or a heater and/or a ventilation system. In order to enable simple attachment to the modular lower part, it is preferably provided that the respective functional component is attached to a support mat, with the support mat being held on the support wires.

The upper part of the backrest, which is made up of the headrest and an upper upholstered body, with the headrest integrated or accommodated in it, is firmly fixed to the structural frame, i.e. it cannot be easily removed or taken off. The reason for this is that in such a vehicle seat with a headrest integrated into the upholstered body of the vehicle seat, this area, which is less heavily used and less adaptable and which is defined by the upper part in the invention, does not usually need to be replaced. This can therefore usually remain on the backrest, so that the effort and costs can be saved if the lower area (here the lower part) of the backrest is to be adapted or replaced. It is preferably provided that the lower part takes up between 65% and 75% of the area of the backrest and the separate, unconnected upper part takes up between 25% and 35% of the area of the backrest. It has been found that these areas of the backrest are expected to be subject to the greatest and least stress and signs of wear and tear and that the functional components are located in this area.

The upper part is therefore not only formed by the headrest, but also forms a support surface for the occupant (not just for the head) in such an integrated vehicle seat. Accordingly, it is preferably provided that the lower cushion body of the lower part and the upper cushion body of the upper part are separated from one another by a dividing line when the vehicle seat is installed, so that the lower cushion body of the lower part and the upper cushion body of the upper part form a support surface that is only interrupted by the dividing line and against which an occupant can rest his or her back. A dividing line does not mean that there is an air gap between the two cushion bodies. Rather, this dividing line is to be understood as an area where the lower cushion body and the upper cushion body touch in order to form a continuous support surface.

The upper part can also be manufactured more easily due to the two-part structure, as it consists of fewer components that are adaptable or need to be adapted, and this can then be done automatically. Accordingly, only a targeted adjustment of the lower part is provided as part of a modular structure, but not of the entire backrest. Accordingly, such a two-part structure of the backrest, in which only the modular lower part can be removed easily and without tools, can shorten production and assembly times. In addition, production and assembly can be automated due to the simplicity.

• - einen oberen Querträger aufweist, an dem das Unterteil über das obere Befestigungsteil zerstörungsfrei lösbar oder abnehmbar an dem Strukturrahmen fixiert ist, und
• - einen unteren Querträger aufweist, an dem das Unterteil über das untere Befestigungsteil zerstörungsfrei lösbar oder abnehmbar an dem Strukturrahmen fixiert ist. Ferner ist vorzugsweise vorgesehen, dass das Oberteil der Rückenlehne unabhängig von dem Unterteil und/oder ohne gemeinsame Befestigungsmittel an dem oberen Querträger befestigt ist.

The structural frame of the vehicle seat preferably consists of metal struts or molded parts and is connected to the body of the vehicle in a well-known manner, for example via a rail system. Preferably, the structural frame is provided in a backrest area

• - has an upper cross member to which the lower part is fixed to the structural frame via the upper fastening part in a non-destructively detachable or removable manner, and
• - has a lower cross member to which the lower part can be non-destructively detachably or removable via the lower fastening part on the structural frame. Furthermore, it is preferably provided that the upper part of the backrest is fastened to the upper cross member independently of the lower part and/or without common fastening means.

Accordingly, an independent fastening of the two parts is achieved via the stabilizing and structural cross members, which simplifies the connection and enables the lower part and also the upper part to be held securely. It is preferably provided that the respective cross member has an area that is designed to complement the respective fastening part on the lower part in order to achieve the detachable or removable connection in a simple manner.

For this purpose, it can be provided, for example, that the upper fastening part is formed by a nose which is fastened to the support structure of the lower part, preferably protruding upwards, and which is held on the upper cross member of the structural frame, in particular engaging in a holder fastened to the upper cross member. It can then also be provided that the lower fastening part is formed by a hook-shaped section or a rear engagement on the support structure of the lower part, wherein the hook-shaped section is held on the lower cross member of the structural frame, in particular rests on a contact surface of the lower cross member and/or engages around it in a hook-shaped manner. In addition, it can be provided that a locking element is arranged on the hook-shaped section, which locks into the lower cross member in order to fix the lower part to the structural frame in a non-destructively detachable or removable manner.

The supporting structure of the lower part is then preferably designed in such a way that the lower part is dimensionally stable due to the supporting structure and can withstand forces that occur when the vehicle seat is in use. Materials such as metal struts and/or plastic parts can be used for the supporting structure. For example, the supporting structure consists of a plastic frame onto which the lower upholstery body is stretched. This also makes it possible to securely attach the respective fastening parts so that the lower part can be held securely to the structural frame.

Preferably, it is further provided that at least some of the support wires of the lower part are held on the upper cross member and/or on the lower cross member of the structural frame, with ends of the respective support wire preferably engaging in receptacles, for example holes, in the upper cross member and/or in the lower cross member. The respective support wire is, for example, part of a suspension of the backrest, which in turn interacts with the lower upholstery body on the rear, for example also via the support mat. By fastening it to the structural frame, the stability and durability of the lower part is improved and the suspension is improved. When assembling the lower part, the ends of the support wires can automatically thread or engage in the receptacles or openings, which simplifies assembly.

• - Bereitstellen eines Strukturrahmens mit einem Rückenlehnenbereich und einem Sitzteilbereich;
• - Bereitstellen eines Sitzteils und Befestigen des Sitzteils an dem Sitzteilbereich;
• - Bereitstellen eines Oberteils mit einem oberen Polsterkörper und einer darin integrierten oder aufgenommenen Kopfstütze, wobei der obere Polsterkörper die Kopfstütze umgibt, und Befestigen des Oberteils an dem Rückenlehnenbereich;
• - Bereitstellen eines Unterteils unabhängig von dem Oberteil, vorzugsweise eines modular aufgebauten, vorgefertigten Unterteils, und Fixieren des Unterteils an dem Rückenlehnenbereich, wobei das Unterteil und das Oberteil zusammen die Rückenlehne ausbilden und das Unterteil unabhängig von dem Oberteil an dem Rückenlehnenbereich des Strukturrahmens befestigt wird, indem
• - das Unterteil mittels eines oberen Befestigungsteils durch eine in vertikaler Richtung ausgerichtete Bewegung oberseitig am Strukturrahmen festgelegt wird, und anschließend
• - das Unterteil durch ein Verschwenken des Unterteils um das obere Befestigungsteil mittels eines unteren Befestigungsteils unterseitig am Strukturrahmen zerstörungsfrei lösbar oder zerstörungsfrei abnehmbar fixiert wird.

According to the invention, a method for assembling the vehicle seat according to the invention is also provided, comprising at least the following steps:

• - Providing a structural frame with a backrest area and a seat part area;
• - Providing a seat part and attaching the seat part to the seat part area;
• - providing an upper part with an upper cushion body and a headrest integrated or accommodated therein, the upper cushion body surrounding the headrest, and attaching the upper part to the backrest region;
• - Providing a lower part independently of the upper part, preferably a modular, prefabricated lower part, and fixing the lower part to the backrest area, wherein the lower part and the upper part together form the backrest and the lower part is fastened to the backrest area of the structural frame independently of the upper part by
• - the lower part is fixed to the upper side of the structural frame by means of an upper fastening part by a movement directed in a vertical direction, and then
• - the lower part is fixed to the underside of the structural frame in a non-destructively detachable or non-destructively removable manner by pivoting the lower part around the upper fastening part by means of a lower fastening part.

The same explanations and advantages apply to the method according to the invention as to the vehicle seat according to the invention. The embodiments of the method and the vehicle seat can be combined with one another.

The individual steps of the process do not necessarily have to be carried out in this order. For example, the lower part can be attached to the structural frame first and then the upper part or the seat part. However, it is advantageous if the structural frame is manufactured first with at least the upper part mounted and then the lower part is assembled (before or after the seat part). In this way, the modular and prefabricated lower part can be manufactured in a JIT factory and then assembled to the separately manufactured structural frame with the upper part already firmly attached to it.

Preferably, it can also be provided that a vehicle seat with a previously assembled seat part and upper part is provided with a new lower part, for example due to a defect or a desired change in the configuration (conversion) of the lower part. The lower part can be easily removed by carrying out the steps for assembling the lower part in reverse order.

• - das obere Befestigungsteil durch eine Nase gebildet ist, die durch die in vertikaler Richtung ausgerichtete Bewegung des Unterteils oberseitig in Eingriff mit einer Halterung an einem oberen Querträger des Strukturrahmens gebracht wird, und/oder
• - das untere Befestigungsteil durch einen hakenförmigen Abschnitt der Tragstruktur des Unterteils gebildet ist, der durch das Verschwenken des Unterteils um das obere Befestigungsteil zu einem Anliegen und/oder zu einem Umgreifen einer Anlagefläche an einem unteren Querträger des Strukturrahmens gebracht wird, insbesondere ergänzend eingerastet wird.

In particular, it is intended that for the assembly

• - the upper fastening part is formed by a nose which is brought into engagement with a bracket on an upper cross member of the structural frame by the vertical movement of the lower part, and/or
• - the lower fastening part is formed by a hook-shaped section of the supporting structure of the lower part, which is brought into contact with and/or into engagement with a contact surface on a lower cross member of the structural frame by pivoting the lower part about the upper fastening part, in particular is additionally locked into place.

• 1 eine Explosionsdarstellung eines erfindungsgemäßen Fahrzeugsitzes;
• 2 ein Sitzgestell des Fahrzeugsitzes gemäß 1;
• 3A eine Seitenansicht des in 1 dargestellten Fahrzeugsitzes während der Fixierung eines Unterteils der Rückenlehne;
• 3B eine Seitenansicht des in 1 dargestellten Fahrzeugsitzes mit vollständig fixiertem Unterteil der Rückenlehne; und
• 4 eine Rückansicht des in 1 dargestellten Fahrzeugsitzes.

The invention is explained in more detail below with reference to the accompanying drawings. They show:

• 1 an exploded view of a vehicle seat according to the invention;
• 2 a seat frame of the vehicle seat according to 1 ;
• 3A a side view of the 1 vehicle seat shown during fixation of a lower part of the backrest;
• 3B a side view of the 1 vehicle seat shown with the lower part of the backrest fully fixed; and
• 4 a rear view of the 1 vehicle seat shown.

1 shows a vehicle seat 1 in an exploded view, wherein the vehicle seat 1 has a backrest 2, a seat part 3 and a structural frame 6, via which the backrest 2 is pivotally connected to the seat part 3. The structural frame 6 is as in 2 shown divided into a backrest area A, which supports the backrest 2, and a seat part area B, which supports the seat part 3.

As in 1 Shown in an exploded view, the backrest 2 has an upper part 7 made up of several components, the upper part 7 in the illustrated embodiment having a headrest 4, a belt outlet 5 and an upper cushion body 15 in which the headrest 4 is accommodated or integrated. Furthermore, a curtain attachment (not shown) can also be provided as part of the upper part 7. The integrated headrest 4 is, for example, a 4-way headrest. The aforementioned components of the upper part 7 are each firmly fixed to the backrest area A of the structural frame 6 and thus form a firmly fixed unit.

The backrest 2 also has a lower part 8 which is independent of the upper part 7 or separate from it or not connected to it and has a structural support structure 11, for example in the form of a plastic frame, a lower upholstered body 9 with side cheeks 17, an upper fastening part 10a in the form of a nose 18 and a lower fastening part 10b in the form of a hook-shaped section 23 with a locking element 23a or a rear grip. A cover 9a can also be pulled over the lower upholstered body 9.

In order to achieve a cushioning effect, support wires 19 (dashed in 1 which additionally has a support mat 22 (dashed in 1 The support wires 19 and the support mat 22 are positioned flat behind the lower cushion body 9 and can therefore absorb shocks.

The lower part 8 can be configured modularly and assembled in a JIT (Just in Time) plant as a modular unit, whereby this modular unit can then be subsequently clipped and/or snapped into the backrest area A of the structural frame 6 without tools via the fastening parts 10a, 10b, as explained later. In addition, the modularly constructed lower part 8 can also be removed without causing any damage if the lower part 8 needs to be replaced, for example in the event of a defect or if a different configuration is desired. Additional functional components 24 can be attached to the modularly constructed lower part 8, for example a lumbar support 24a (in 1 shown only schematically) and/or side walls 17 with an automatic adjustment system 24b (in 1 shown only schematically) and/or a massage system 24c (in 1 shown only schematically) and/or a heater 24d (in 1 shown only schematically) and/or a ventilation 24e (in 1 shown only schematically).

A belt buckle 14 is also attached to the structural frame 6 in the seat part area B and armrests 12 are attached to the backrest area A. In order to enable the lower part 8 to be easily attached and removed without damaging it from the structural frame 6, the latter has an upper cross member 6a and a lower cross member 6b in the backrest area A. The upper cross member 6a is attached to the upper cross member 6a in accordance with 2 a holder 21 or a receptacle is arranged, into which the nose 18 (upper fastening part 10a) on the lower part 8 or on the support structure 11 can engage. Furthermore, receptacles 20 in the form of holes are provided on the upper cross member 6a, into which the support wires 19 can be hung or fastened with their ends. The lower cross member 6b has a contact surface 25, on or around which the hook-shaped section 23 (lower fastening part 10b) can be placed.

• Zunächst wird das modular aufgebaute Unterteil 8 mit den jeweiligen Funktionskomponenten 24 bereitgestellt. Das obere Befestigungsteil 10a am Unterteil 8, das hier die Form einer Nase 18 aufweist, wird durch eine Bewegung in vertikaler Richtung z hinter der Halterung 21 positioniert, beispielsweise untergehakt. Dieser Zustand, bei dem das obere Befestigungsteil 10a untergehakt ist, ist in 3A gezeigt.

Based on the 3A and 3B the procedure for assembling the vehicle seat 1, in particular the installation of the lower part 8 of the backrest 2 to the structural frame 6, can be understood:

• First, the modularly constructed lower part 8 is provided with the respective functional components 24. The upper fastening part 10a on the lower part 8, which here has the shape of a nose 18, is positioned behind the holder 21 by a movement in the vertical direction z, for example hooked under. This state, in which the upper fastening part 10a is hooked under, is in 3A shown.

The lower part 8 is then pivoted around the holder 21 or the upper fastening part 10a and the lower fastening part 10b or the hook-shaped section 23 is thereby brought in the longitudinal direction x in the direction of the lower cross member 6b. From a certain pivoting, the hook-shaped section 23 rests on the contact surface 25 on the lower cross member 6b and the locking element 23a locks, for example, into an opening or the like on the lower cross member 6b. This state is in 3B shown. The lower part 8 is thereby detachably attached to the backrest area A of the structural frame 6. In this state, the lower cushion body 9 and the upper cushion body 15 form a support surface which is only separated by a dividing line L between the lower part 8 and the upper part 7 or between the two cushion bodies 9, 15 by a slot.

Finally, as in 4 shown, close a panel 13 on the back of the backrest 2 by means of a zipper 16 so that the back is also closed.

To remove the lower part 8, it is pulled away from the lower cross member 6b in the longitudinal direction x in the lower area, for example after manually grasping the lower part 8. The locking element 23a then releases when a corresponding pulling force is exerted and the lower part 8 can be pivoted around the upper fastening part 10a or the holder 21 by a pivoting movement. From a certain pivoting position, the nose 18 can be freed from the holder 21 by a downward movement (z) of the lower part 8 and the lower part 8 can be removed and replaced with a new or repaired lower part 8. This process takes place without tools and is non-destructive.

List of reference symbols

1

Vehicle seat

2

backrest

3

Seat part

4

headrest

5

Belt outlet

6

Structural frame

6a

upper cross member

6b

lower cross member

7

Top

8

Bottom part

9

lower cushion body

10a

upper fastening part

10b

lower fastening part

11

Supporting structure

12

armrest

13

Aperture

14

Belt buckle

15

upper cushion body

16

zipper

17

Side panels

18

Nose

19

Support wire

20

Recording

21

Bracket

22

Support mat

23

hook-shaped section

23a

Locking element

24

Functional element

24a

Lumbar support

24b

Adjustment system

24c

Massage system

24d

Heating

24e

ventilation

25

Contact surface

A

Backrest area

B

Seat area

L

dividing line

x

longitudinal direction

z

vertical direction

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions.

Cited patent literature

• US 6811227 B2 [0004]
• US7775603 [0005]
• EP3543124 [0006]
• US 10974634 B2 [0007]

Claims (15)

Vehicle seat (1) having a structural frame (6), a backrest (2) and a seat part (3), wherein the backrest (2) has a lower part (8) and an upper part (7), wherein the upper part (7) has an upper cushion body (15) and a headrest (4) integrated or accommodated therein, wherein the upper cushion body (15) surrounds the headrest (4), and wherein the lower part (8) has a support structure (11), a lower cushion body (9), support wires (19) for supporting the lower cushion part (9) and functional components (24), characterized in that the lower part (8) of the backrest (2) has an upper fastening part (10a) and a lower fastening part (10b) and the lower part (8) is fixed to the structural frame (6) independently of the upper part (7) via these fastening parts (10a, 10b), wherein the lower part (8) can be non-destructively detached or removed from the structural frame (6) is fixed. Vehicle seat (1) after Claim 1 , characterized in that the non-destructively detachable or removable fixation is formed by a clip connection and/or a latching connection between the lower part (8) and the structural frame (6). Vehicle seat (1) after Claim 1 or 2 , characterized in that the upper part (7) is permanently and/or non-removably fixed to the structural frame (6) and the upper part (7) preferably has a belt outlet (5). Vehicle seat (1) according to one of the preceding claims, characterized in that the structural frame (6) in a backrest region (A) - has an upper cross member (6a) to which the lower part (8) is fixed to the structural frame (6) in a non-destructively detachable or removable manner via the upper fastening part (10a), and - has a lower cross member (6b) to which the lower part (8) is fixed to the structural frame (6) in a non-destructively detachable or removable manner via the lower fastening part (10a). Vehicle seat (1) after Claim 4 , characterized in that the upper part (7) of the backrest (2) is fastened to the upper cross member (6a) independently of the lower part (8) and/or without common fastening means. Vehicle seat (1) after Claim 4 or 5 , characterized in that the upper fastening part (10a) is formed by a nose (18) which is fastened to the support structure (11) of the lower part (8), preferably projecting upwards, and which is held on the upper cross member (6a) of the structural frame (6), in particular engages in a holder (21) fastened to the upper cross member (6a). Vehicle seat (1) according to one of the Claims 4 until 6 , characterized in that the lower fastening part (10b) is formed by a hook-shaped portion (23) on the support structure (11) of the lower part (8), wherein the hook-shaped portion (23) is held on the lower cross member (6b) of the structural frame (6), in particular rests against a contact surface (25) of the lower cross member (6b) and/or engages around it in a hook-shaped manner. Vehicle seat (1) after Claim 7 , characterized in that a locking element (23a) is arranged on the hook-shaped section (23), which locks into the lower cross member (6b) in order to fix the lower part (8) to the structural frame (6) in a non-destructively detachable or removable manner. Vehicle seat (1) according to one of the Claims 4 until 8 , characterized in that at least some of the support wires (19) of the lower part (8) are held on the upper cross member (6a) and/or on the lower cross member (6b) of the structural frame (6), wherein preferably ends of the respective support wire (19) engage in receptacles (20) in the upper cross member (6a) and/or in the lower cross member (6b). Vehicle seat (1) according to one of the preceding claims, characterized in that the lower part (8) takes up 65% to 75% of the area of the backrest (2) and the upper part (7) which is separate therefrom and not connected thereto takes up between 25% and 35% of the area of the backrest (2). Vehicle seat (1) according to one of the preceding claims, characterized in that the lower cushion body (9) of the lower part (8) and the upper cushion body (15) of the upper part (7) are separated from one another by a dividing line (L), preferably by a slot, in the assembled state of the vehicle seat (1), so that the lower cushion body (9) of the lower part (8) and the upper cushion body (15) of the upper part (7) form a support surface for the occupant which is interrupted by the dividing line (L). Vehicle seat (1) according to one of the preceding claims, characterized in that the lower part (8) is designed as a modular, prefabricated unit with one or more functional components (24), wherein the modular, prefabricated unit has as functional component (24): a lumbar support (24a) and/or an adjustment system (24b) for the side bolsters (17) and/or a massage system (24c) and/or a heater (24d) and/or a ventilation system (24e). Vehicle seat (1) after Claim 12 , characterized in that the respective functional component (24) is fastened to a support mat (22), wherein the support mat (22) is held on the support wires (19). Method for assembling a vehicle seat (1), in particular a vehicle seat (1) according to one of the preceding claims, with at least the following steps: - providing a structural frame (6) with a backrest area (A) and a seat part area (B); - providing a seat part (3) and fastening the seat part (3) to the seat part area (B); - providing an upper part (7) with an upper cushion body (15) and a headrest (4) integrated or accommodated therein, the upper cushion body (15) surrounding the headrest (4), and fastening the upper part (7) to the backrest area (A); - Providing a lower part (8) independent of the upper part (7), preferably a modular, prefabricated lower part (8), and fixing the lower part (8) to the backrest area (A), wherein the lower part (8) and the upper part (7) together form the backrest (2) and the lower part (8) is fixed to the backrest area (A) of the structural frame (6) by means of - the lower part (8) is fixed to the upper side of the structural frame (6) by means of an upper fastening part (10a) by a movement aligned in the vertical direction (z), and then - the lower part (8) is fixed to the lower side of the structural frame (6) by pivoting the lower part (8) around the upper fastening part (10a) by means of a lower fastening part (10b) in a non-destructively detachable or non-destructively removable manner. Procedure according to Claim 14 , characterized in that - the upper fastening part (10a) is formed by a nose (18) which is brought into engagement with a holder (21) on an upper cross member (6a) of the structural frame (6) by the movement of the lower part (8) in the vertical direction (z), and/or - the lower fastening part (10b) is formed by a hook-shaped section (23) of the support structure (11) of the lower part (8), which is brought to rest on and/or to engage around a contact surface (25) on a lower cross member (6b) of the structural frame (6) by the pivoting of the lower part (8) about the upper fastening part (10a), in particular is additionally latched.