DE102016218037A1 - Seating frame with side panels and tubular frame construction, group of seat bases for different types of vehicle seats and mounting methods - Google Patents

Abstract

More particularly, the invention relates to a seat base (U) for a vehicle seat, comprising at least a first side part (1a) and a second side part (1b), which are arranged opposite one another and form part of a substructure for the vehicle seat, via which weight forces are absorbed. caused by a person sitting on the vehicle seat. According to the invention, the first and second side parts (1a, 1b) are connected to one another via a tubular frame construction (2), via which a position of a seat pan part (SW) to be fixed to the seat base frame (U) is predetermined for the vehicle seat.

Description

The invention particularly relates to a seat base for a vehicle seat according to the preamble of claim 1.

A generic seat base for a vehicle seat has to connect the seat base to a floor of a vehicle or for connecting the seat base to a to be fixed to the floor rail assembly on which the seat frame is longitudinally displaceable, at least a first side part and a second side part, the are arranged opposite one another. In particular weight forces are to be absorbed by the first and second side parts, which are caused by a person sitting on the vehicle seat. Of course, such side parts are usually designed to absorb crash-induced forces introduced into the vehicle seat structure. For example, if necessary, forces must also be absorbed via the side parts of a seat underframe which, in the event of a crash, act on the seat underframe and in particular the side parts via a seatbelt fixed to the seat underframe.

In previously customary in practice side parts of a seat base frame, the side parts are designed differently, depending on whether the side panel is on the door or tunnel side use. Thus, different interfaces, for example for the fixation of a seatbelt and / or desired trim components, are then formed via the side parts. Furthermore, the side parts vary depending on how high a seat of the respective vehicle seat should be arranged. A seat pan part, which at least partially supports a seat cushion of the vehicle seat, is accordingly provided in different types of vehicle seats on different types of first and second side parts. Accordingly, a variety of different side panels must be kept in practice for different types of vehicle seats and their seat bases.

For example, from the DE 10 2010 028 562 A1 In order to reduce the variety of parts for different types of seat base, it is already known to produce different types of side parts for different seat bases by removing portions from a first type of side part to form therefrom a side part of a second type for another type of vehicle seat. For example, a side panel of the first type is trimmed and / or shortened to obtain a side panel of the second type. As a result, although the production of different side parts for the different types of vehicle seats and different types of corresponding seat bases is then simplified. For the assembly but still the different types of side panels must be kept.

The invention is therefore based on the object to provide a seat base, the assembly is easier and more flexible, and to provide a mounting method for mounting different types of seat bases, which is faster, more flexible and / or less expensive.

The above objects are achieved by a seat frame of claim 1, a group of seat bases of claim 12 and a mounting method of claim 14.

In a seat undercarriage according to the invention for a vehicle seat, a first, for example door-side part and a second, for example, tunnel-side side part are provided, which are arranged opposite each other - usually transverse to a seat longitudinal axis - and part of a substructure for the vehicle seat, on the weight forces of a to be seated on the vehicle seat person. The first and second side parts are thus load-bearing components of the seat underframe, wherein on the opposite side parts a - relative to a seat longitudinal axis - right and left side of the seat frame is defined. According to the invention, it is further provided that the first and second side parts are connected to one another via a tubular frame construction, via which a position of a seat pan part to be fixed to the seat underframe is predefined for the vehicle seat.

With a view to the specification of a specific position of a seat pan part to be fixed to the seat base for the vehicle seat, which at least partially carries a seat cushion of the vehicle seat, a tubular frame construction is provided here. Only this additional tubular frame construction specifies the desired position of the seat pan part on the vehicle seat, and thus in particular any interfaces and / or bearing points for the fixation and / or support of the seat pan part. By providing a separate tubular frame construction for specifying the position of the seat pan part, the side parts can be made less complex. Furthermore, the seat base can be modularly constructed in a simple manner, so that the seat base frame can be adapted to a particular type of vehicle seat solely via the tubular frame construction. While the fixation of the seat underframe is realized, for example, on a rail arrangement for longitudinal adjustment of the vehicle seat via the side parts, only the one to be connected to the side parts Pipe frame construction, the position of the seat pan part on the seat base before.

Under a tubular frame construction is understood in particular a rigid and immovable fixed to the side panels tubular frame, ie in particular a tubular frame, which has no articulation with the side panels. A single height-adjustable cross tube or a plurality of individual height-adjustable transverse tubes thus do not constitute a tubular frame construction in the sense of the solution in question here. around a preferably pre-assembled and subsequently to the side panels to be fixed structure of at least two rigidly with each other and extending along different spatial directions extending tubes.

In particular, it may be provided that a height of the seat pan part - with respect to the floor of the vehicle - is predetermined via the tubular frame construction. The arranged on the seat parts tube frame construction thus determines where and how the seat pan part is arranged on the seat base.

In one embodiment variant, the first and second side parts of the seat underframe are designed as identical parts, so that identically formed side parts are used for the right and left sides of the seat underframe. Consequently, completely identically formed side parts are consequently arranged on the seat underframe such that they can be transferred into one another by a parallel displacement. For possibly different interfaces or components on the right and left sides of the seat underframe, different additional means are provided, for example, on each first and second side part ,

In one embodiment variant, the tubular frame construction on the first side part is fixed on an inner side facing the other, second side part, and on the second side part on an outer side facing away from the first side part. The tubular frame construction is therefore once set inside and once outside on the first and second side panels. This variant is particularly advantageous for identically formed first and second side parts, since in this case the connection with the tubular frame construction is ultimately made on the same side surfaces of the side parts. The same interface can thus be used on each side section. The tubular frame construction is thus fixed to the side panels on the same side, e.g. each on the right, but this side of the seat base is once inside (the left side panel) and once outside (the right side panel).

In principle, it can be provided that the tubular frame construction is welded to the first and second side parts. This allows a weight-saving design of the seat base and a quick installation.

The tubular frame construction may be made asymmetrical with respect to a seat longitudinal axis, transverse to which the first and second side parts face each other. This is usually given, for example, in the above-described determination of the tubular frame construction on an inner side of the first side part and on an outer side of the second side part. As a result of the asymmetrical design of the tubular frame construction, it can be achieved, for example, that the tubular frame construction can only be connected to the first and second side parts in a defined manner.

In one embodiment variant, the tubular frame construction has a single preassembled tubular frame. By using a preassembled tubular frame bearing parts of the seat base can be made comparatively inexpensive. Such a tubular frame then has, for example, at least two pipes connected to one another, wherein these pipes can each be manufactured separately and bent at at least one point in order to give the pipe frame the predetermined contour.

In one exemplary embodiment, the tubular frame construction has two side tubes, each fixed to one of the side parts, and a central tube connecting the two side tubes, which extends with at least one section between the side parts. The center tube is to support the seat pan part over the width of the seat on the finished vehicle seat and to receive corresponding weight forces, preferably in a front area of the vehicle seat.

At least one tube of the tubular frame construction may be bent at least once. In particular, all tubes of the tubular frame construction can each be bent at least once to give the tubular frame construction the desired shape.

In one embodiment, at least one tube of the tubular frame construction is L-shaped or Γ-shaped, where "Γ" stands for the major of the Greek letter gamma. It has been found that from L-shaped and / or Γ-shaped tubes particularly simple tubular frame construction can be produced, which can act as a support of a seat pan part to the seat base. Also, from such shaped tubes, different types of tubular frame constructions can be made comparatively easy to be made. With an appropriate choice of tube geometry, a tubular frame construction formed with it is also easily enough stable and yet relatively easy.

In one embodiment, the seat underframe on a tubular frame construction with a tubular frame, the tubes are all designed differently from each other. Here, therefore, the tubes of the tubular frame with respect to their length, contour and / or (cross-sectional) geometry are different. This reduces during assembly the risk of incorrect use of individual tubes, which ultimately only one type of tube is provided for a specific point of the tube frame.

The tubes of the tubular frame construction can in principle be fixed to one another via separate fastening means. With a view to a fast and cost-effective production is provided in an embodiment that the tubes of the tubular frame construction are welded together.

By way of example, the tubular frame construction can have at least one square tube which defines an interface for fixing the seat pan part. By using a square tube results over a round tube, the advantage that on the lateral surface of the tube a flat contact surface and / or bearing point is present. This facilitates a stable fixation of the seat pan part to the tubular frame construction.

Another aspect of the invention is the provision of a modular system for creating different types of vehicle seats. In this case, in particular, the first and second side parts each form a first pre-assembly, which is combined depending on the type of vehicle seat with a second subassembly with a frame construction, wherein for the second subassembly of different types of frame structures can be selected.

It is therefore proposed a group of seat bases for different types of vehicle seats, in which a seat pan part is respectively positioned differently and for the respective position of the seat pan part one of several possible frame structures with always identically formed side panels is combined. The seat bases of the group of seat bases thus comprise identically formed side parts, with each seat base two side parts for connection of the respective seat frame to a floor of a vehicle or for connection of the seat frame to be fixed to the floor rail arrangement are arranged opposite to each other and the two side parts Weight forces of a person sitting on the vehicle seat should be recorded. Depending on the type of vehicle seat, the seat bases have different frame structures, via which the two side parts are connected to each other and on each a different position, in particular position and / or orientation of a determined on the seat base seat pan part is specified for the respective vehicle seat.

In the group of seat bases according to the invention, individualization for the respective vehicle seat type thus takes place via the frame construction or the type of frame construction, wherein the individual frame structures may differ from one another, in particular with regard to geometry, dimensions and / or contour. For example, if the frame structure has a tubular frame, depending on the type of frame construction, for example, the number, the geometry (for example, in view of the cross section and the tube thickness), the length and / or the contour of the tubes differ in the different types used by frame structures.

In one embodiment, each seat frame each has two completely identically formed side parts, so that not only the side parts of the different seat bases for the different types of vehicle seats are identical to each other, but also opposite side parts of a single seat frame. Thus, a single type of side member is used here, over which, in combination with various frame constructions, different seat bases are made for different types of vehicle seats. Thus, not only in the seat bases for different vehicle seats, the side panels used are designed as equal parts, but also in a single seat base frame. Thus, at the finished vehicle seat, a door-side member does not differ from a tunnel-side member. In a vehicle seat of another type, that is, for example, another series, only the fixed to the two identical side parts, preferably welded frame construction is different.

• – Bereitstellen mehrerer identisch ausgebildeter erster Seitenteile und mehrerer identisch ausgebildeter zweiter Seitenteile, über die Gewichtskräfte aufgenommen werden sollen, die durch eine auf dem Fahrzeugsitz sitzende Person verursacht werden, zur Montage unterschiedlicher Sitzuntergestelle für die unterschiedlichen Typen von Fahrzeugsitzen,
• – Bereitstellen mindestens zweier unterschiedlicher Typen von Rahmenkonstruktionen zur Verbindung erster und zweiter Seitenteile miteinander, wobei je nach Typ der Rahmenkonstruktion eine Position eines an dem Sitzuntergestell festzulegenden Sitzwannenteils für den Fahrzeugsitz vorgegeben ist, die sich von derjenigen Position unterscheidet, die über einen anderen Typ von Rahmen Konstruktion vorgegeben wird,
• – Auswählen eines Typs von Rahmenkonstruktion in Abhängigkeit davon, für welchen Typ Fahrzeugsitz das Sitzuntergestell verwendet werden soll, und
• – Verbinden einer Rahmenkonstruktion des ausgewählten Typs mit ersten und zweiten Seitenteilen, die einander gegenüberliegend angeordnet wurden.

Against this background, an assembly method is proposed in which seat bases for different types of vehicle seats, in which a seat pan part is positioned differently, are assembled from a first subassembly having identical side parts and different types of frame constructions as a second subassembly. An assembly method according to the invention comprises at least the following steps:

• Providing a plurality of identically designed first side parts and a plurality of identically formed second side parts, via which weight forces are to be absorbed, which are caused by a person sitting on the vehicle seat, for mounting different seat bases for the different types of vehicle seats,
• - Providing at least two different types of frame structures for connecting first and second side parts together, depending on the type of frame construction, a position of a seat base to be determined on the seat frame seat pan portion is specified for the vehicle seat, which differs from the position that a different type of frame Construction is predetermined,
• Selecting a type of frame construction depending on which type of vehicle seat the seat base is to be used for, and
• - Connecting a frame construction of the selected type with first and second side parts, which were arranged opposite each other.

In a variant of the method can be provided analogous to the above explanations that only one type side part is provided for the first and second side parts, so that a door-side part and a tunnel-side side part of each seat base are identical. When assembling the seat undercarriage, therefore, two identical side parts are always used to form a first preassembly and then combined with a second preassembly, which is different depending on the type of vehicle seat. For example, identically designed side parts are welded to different tube frames, depending on which type of vehicle seat is to be mounted.

The attached figures exemplify possible embodiments of the invention.

Hereby show:

1A - 1B an embodiment variant of a seat undercarriage according to the invention with identically formed side parts, which are connected to each other via a welded, asymmetric tubular frame;

2 the seat base of the 1A and 1B with a seat pan part fixed to the tubular frame;

3A - 3B additional perspective views of the seat base of the seat pan part;

4 a flowchart illustrating a possible assembly method based on a modular system according to the invention.

The 1A - 1B . 2 and 3A - 3B show a seat base U for a vehicle seat, consisting of identical side panels 1a and 1b and a frame construction in the form of a tubular frame 2 is constructed. The seat base U is in this case fixed to a rail arrangement S with two pairs of rails Sa and Sb, via which the seat base U is displaceable along a seat longitudinal direction L. side panels 1a and 1b lie opposite each other across a seat longitudinal axis, which runs along the seat longitudinal direction L. The side parts 1a and 1b of the seat base U are each on a sliding upper rail 3a or 3b a pair of rails Sa or Sb fixed, here with the respective upper rail 3a or 3b welded. Each side part 1a . 1b in this case has two along the seat longitudinal direction L spaced mounting portions 10 and 11 on, over which the respective side part 1a or 1b on the associated upper rail 3a . 3b is fixed.

The side parts 1a and 1b are executed as identical parts and therefore completely identical. Due to the identical design of the side panels 1a and 1b these can be converted into each other by a parallel shift. The side parts 1a and 1b are thus arranged to each other on the seat base such that on the seat base U at the one side part 1a or 1b a page 101 or 102 inside and the other side part 1b or 1a the same page 101 or 102 lies outside. For example, this is a right-hand page 101 of the first side part 1a the other side part 1b facing and thus lies inside, while the other side part 1b this page 101 lies outside. The same applies vice versa for the respective left side 102 the side parts 1a and 1b ,

By using identical parts for the two side panels 1a and 1b on a seat base U, these consequently do not differ depending on whether hereby a door-side or tunnel-side side part of the seat base U is formed. The actual interfaces, in particular for the determination of a seat pan part SW of the vehicle seat only through the tubular frame 2 defined to the side panels 1a and 1b is welded. A pair of side panels 1a . 1b thus forms a first preassembly for the seat base U, with a second preassembly with the tube frame 2 is combined to mount the seat base U.

The tubular frame 2 This is made of three square tubes 20 . 21 and 22 built up. The square tubes 20 and 21 are executed as curved and substantially each L-shaped side tubes. These two side pipes 20 and 21 are interconnected by the third square tube, which thus a central tube 22 forms. The pipes 20 . 21 and 22 of the tubular frame 2 are designed differently and have different contours and lengths. That's the middle tube 22 Γ-shaped and has two different lengths right and left connection sections 22a and 22b on, over a cross piece 22c of the central tube 22 connected to each other. The two side pipes 20 and 21 are also in each case L-shaped, but have different lengths and thus different long front connecting portions 20v and 21v that in with the center tube 22 is welded. At the one (left) side tube 20 extends the front connecting section 20v up to the top rail 3a , At the other (right) side tube 21 is the front connecting section 21v shorter and ends above the top rail 3b , Here is the longer end of the connection section 22b of the central tube 22 up to the top rail 3b guided.

Through the different curved tubes 20 . 21 and 22 These are on the finished tubular frame 2 nested together so that the tubular frame 2 is extremely resilient at comparatively low weight and easy with identical side panels 1a and 1b can be welded. Both side pipes 20 and 21 For this purpose, have rear connection sections 20h and 21h on, each on a side panel 1a or 1b are welded. Each connection section 20h and 21h is on the right side 101 the respective side part 1a or 1b set inside or outside. Accordingly, this is a left side tube 20 over its rear connecting section 20h on an inside of the left side part 1a fixed. The opposite right side tube 21 is over its rear connecting section 21h on the outside of the other, right side part 1b arranged.

Starting from the respective rear connection section 20h and 21h extends a side pipe 20 or 21 slightly inclined upwards and then goes over a bending point in a downward in the direction of the respective upper rail 3a or 3b extending front connecting portion 20v or 21v above. At each front connecting section 20v . 21v is the respective side tube 20 or 21 with the center tube 22 welded. An additional welding with a front portion of the respective side part 1a or 1b in the area of the attachment section 11 and / or with the respective upper rail 3a or 3b is on the left side part 1a over the front connecting section 20v one side tube 20 , on the other, right side through the longer front connecting section 22b of the central tube 22 realized.

In the asymmetric tubular frame 2 also covers the Γ-shaped center tube 22 with its left connection section 22a the left side tube 20 so that on the one, left side of the center tube 22 with its left connection section 22a lies on the outside, while on the opposite, right side of the right side tube 21 with its front connecting portion 21v lies outside.

As based on the 2 and 3A - 3B is illustrated forms the tubular frame 2 with his pipes 20 . 21 and 22 the interfaces for the fixation of the seat pan part SW on the seat base U and also provides the height in which the seat pan part SW is present at the finished vehicle seat. The essentially U-shaped seat pan part in the plan view lies on the tubular frame in the intended condition 2 on, at the rear connecting sections 20h and 21h the two side tubes and on the cross piece 22c of the central tube 22 , and is fixed thereto, eg via screw, bolt and / or rivet connections.

In the 3A and 3B By the way, it is still below the tube frame 2 a connection component V connecting the two pairs of rails Sa and Sb is shown. At this example, an electric motor drive device is accommodated for the seat adjustment.

In the illustrated seat base U a modular construction is ensured in a simple manner, in which identical side parts 1a and 1b form a first subassembly and a second subassembly in the form of an asymmetric tubular frame construction on the side panels 1a and 1b is welded. It can, depending on the desired vehicle type and therefore for different series another tube frame 2 with the identical side parts 1a . 1b be welded in order to pretend about the position of the seat pan part SW and the necessary interfaces for the fixation of the seat pan part SW. The corresponding pipes 20 . 21 and 22 , which nested together the desired tube frame 2 result, in this case are then bent to the appropriate contours and optionally provided in different lengths.

In the 1A are exemplified by two hatchings a shortened front connecting portion 20v for an alternative left side tube 20 ' and one at its right connecting portion 22b shortened center tube 22 ' illustrated. A corresponding tubular frame 2 would thus specify a lower height for a seat pan part SW to be determined thereon and would thus be provided for a different type of vehicle seat. Such can with only one type side part 1a . 1b and different tube frames 2 one Modular system can be provided to produce different types of seat bases U for different types of vehicle seats in a simple and cost-effective manner.

Based on the flowchart of 4 is the sequence of a possible assembly process for a group of different seat bases U illustrated in more detail.

In this case, initially in a first method step A1, two identical side parts are produced 1a and 1b the modular box positioned opposite each other and, for example, already on top rails 3a and 3b a rail assembly S welded. Subsequently, in a selection process of a method step A2, it is decided which of several different, pre-held tube frames 2 with the side parts 1a and 1b is to be welded to produce the seat base U of the given type. Depending on the type seat base U respectively type vehicle seat is in process steps 3.1 . 3.2 , .... the respective tubular frame 2 selected and then in a subsequent step A4 with the pair of side panels 1a . 1b welded. In this way, for example, in two different types of vehicle seats, only a single type of side part 1a . 1b and two types of tubular frame 2 be kept. Here are the different types of tubular frame 2 be made of different bent square tubes. For example, always two different curved square tubes are provided and welded together to form the respective tubular frame, but have different lengths to specify the respective seat pan part depending on the type seat base U a different height and location.

It should be noted that, of course, the step of selecting the appropriate tube frame 2 also already in advance in the context of a design or planning process and thus can not be done directly in the assembly of the seat base U. For example, different production lines for different seat base types may have been planned beforehand via the modular system provided, in which case only one type of tubular frame will be installed at a time.

LIST OF REFERENCE NUMBERS

10, 11

attachment section

101, 102

First / Second page

1a, 1b

side panel

2

Tubular frame (frame construction)

20, 20 ', 21

side pipe

20v, 20h

(front / rear) connecting portion

21v, 21h

(front / rear) connecting portion

22, 22 '

center tube

22a, 22b

(left / right) connecting section

22c

crosspiece

3a, 3b

upper rail

L

Seat longitudinal direction

S

rail arrangement

Sa, Sb

pair of rails

SW

When seat part

U

Seat base

V

connecting member

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been 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 assumes no liability for any errors or omissions.

Cited patent literature

• DE 102010028562 A1 [0004]

Claims (15)

Seat undercarriage for a vehicle seat, which is used for connecting the seat underframe (U) to a floor of a vehicle or for connecting the seat underframe (U) to a rail arrangement (S) to be fixed to the floor, via which the seat underframe (U) is mounted longitudinally displaceably, at least a first side part ( 1a ) and a second side part ( 1b ), which are arranged opposite one another and are to be received via the weight forces which are caused by a person sitting on the vehicle seat, characterized in that the first and second side parts ( 1a . 1b ) via a tubular frame construction ( 2 ) are connected to each other via which a position of a seat pan part (SW) to be fixed to the seat base frame (U) is predetermined for the vehicle seat. Seat undercarriage according to claim 1, characterized in that the first and second side parts ( 1a . 1b ) are formed completely identical. Seat underframe according to claim 1 or 2, characterized in that the tubular frame construction ( 2 ) Interfaces for fixing the seat pan (SW) to the tubular frame construction ( 2 ) having. Seat underframe according to one of claims 1 to 3, characterized in that on the tubular frame construction ( 2 ) A height of the seat pan part (SW) is specified. Seat underframe according to one of the preceding claims, characterized in that the tubular frame construction ( 2 ) on the first side part ( 1a ) on one another, the second side part ( 1b ) facing inside ( 101 ) and on the second side part ( 1b ) on one of the first side part ( 1a ) facing away from the outside. Seat underframe according to one of the preceding claims, characterized in that the tubular frame construction ( 2 ) with respect to a seat longitudinal axis (L), transverse to which the first and second side parts ( 1a . 1b ) are opposite each other, designed asymmetrically. Seat underframe according to one of the preceding claims, characterized in that a tubular frame ( 2 ) of the tubular frame construction two each at one of the side parts ( 1a . 1b ) fixed side pipes ( 20 . 21 ) as well as the two side tubes ( 20 . 21 ) connecting the middle tube ( 22 ), which communicates with at least one section ( 22c ) between the side parts ( 1a . 1b ). Seat underframe according to one of the preceding claims, characterized in that at least one tube ( 20 . 21 . 22 ) of the tubular frame construction ( 2 ) is bent at least once, in particular all tubes ( 20 . 21 . 22 ) of the tubular frame construction ( 2 ) are each bent at least once. Seat underframe according to one of the preceding claims, characterized in that at least one tube ( 20 . 21 . 22 ) of the tubular frame construction ( 2 ) Is L-shaped or Γ-shaped. Seat underframe according to one of the preceding claims, characterized in that a tubular frame ( 2 ) of the tubular frame construction of pipes ( 20 . 21 . 22 ) is formed, which are all designed differently from each other. Seat underframe according to one of the preceding claims, characterized in that the tubular frame construction ( 2 ) at least one square tube ( 20 . 21 . 22 ), which defines an interface for the determination of the seat pan part (SW). Group of seat bases (U) for different types of vehicle seats, in which a seat pan part (SW) is in each case positioned differently, characterized in that - the seat bases (U) have identically formed first side parts (U) ( 1a ) and identically formed second side parts ( 1b ), wherein at each seat base (U) a first and a second side part (U) 1a . 1b ) for connecting the respective seat underframe (U) to a floor of a vehicle or for connecting the seat frame (U) to a to be fixed to the floor rail arrangement (S), via which the seat frame (U) is mounted longitudinally displaceable, are arranged opposite to each other and over the two side parts ( 1a . 1b ) Weight forces are to be absorbed, which are caused by a person sitting on the vehicle seat, and - depending on the type of vehicle seat, the seat bases (U) different frame structures ( 2 ), over which the two side parts ( 1a . 1b ) are each connected to each other and on each of which a different position of the seat base (U) to be determined seat pan part (SW) is predetermined for the respective vehicle seat. Group according to claim 12, characterized in that each seat subframe (U) each have two completely identically formed side parts (U). 1a . 1b ), so that not only the side parts ( 1a . 1b ) of the different seat bases (U) for the different types of vehicle seats are identical to each other, but also each other opposite side parts ( 1a . 1b ) of a single seat base (U). Method for mounting seat bases (U) for different types of vehicle seats, in which a seat pan part (SW) is positioned differently, comprising at least the following steps: - providing a plurality of identically formed first side parts (U) ( 1a ) and a plurality of identically formed second side parts ( 1b ) for mounting different seat bases (U) for the different types of vehicle seats intended to receive weight forces caused by a person sitting on the vehicle seat, - providing at least two different types of frame structures ( 2 ) for connecting first and second side parts ( 1a . 1b ), depending on the type of frame construction ( 2 ) a position of a seat pan part (SW) to be fixed to the seat base (U) is predetermined for the vehicle seat, which differs from the position which is predetermined by another type of frame construction, - selecting a type of frame construction ( 2 ) depending on which type of vehicle seat the seat base (U) is to be used for, and - connecting a frame structure ( 2 ) of the selected type with first and second side parts ( 1a . 1b ) arranged opposite each other. A method according to claim 14, characterized in that for the first and second side parts ( 1a . 1b ) only one type of side part is provided, so that a door-side part ( 1a ; 1b ) and a tunnel-side side part ( 1b ; 1a ) of each seat underframe (U) are identical.

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