Backrest assembly with seatbelt retractor module for seatbelt integral seat

Abstract

The invention relates to a backrest assembly of a safety belt integral seat, comprising a first assembly having backrest side rails (10, 20) between which at least one backrest head plate is arranged in a stationary manner. According to the invention, the backrest assembly comprises a second assembly designed as a prefabricated seatbelt retractor module, the seatbelt retractor module having a rear backrest head plate (71) and at least one receptacle, the seatbelt retractor module having the at least one receptacle on the inner face thereof, the seat belt retractor module has at least one receptacle in which the seat belt retractor module is reversibly arranged, the seat belt retractor module being integrally arranged in an installation space formed in the first component in the assembled state, and the seat belt retractor module having an inner surface facing the front backrest head plate (40) of the first component in the assembled state, the inner surface facing the front backrest head plate (40) of the first component in the assembled state. The installation space is bounded by the backrest side beams (10, 20) and the front backrest head plate (40).

Description

Technical Field

[0001] The present invention relates to a backrest assembly of an integrated seat belt seat, which includes a first assembly having side beams of the backrest, and at least one backrest headrest is fixedly arranged between the side beams of the backrest. Background Art

[0002] Patent document DE 11 2018 006 209 B4 describes a vehicle seat, in particular a motor vehicle seat, which has a seat part arranged on a seat substructure, a backrest pivotally arranged on the seat part or the seat substructure via a backrest fitting around a backrest pivot, wherein the vehicle seat has a seat belt in a three-point configuration, and wherein the seat belt guide passes through a seat belt outlet arranged in the upper side region of the backrest. It is disclosed therein that the vehicle seat according to the first embodiment is equipped with a seat belt retractor and an additional load belt in the backrest area. The seat belt retractor preferably has a seat belt tensioner. The seat belt retractor assigned to the seat belt for fixing the user is held in the upper backrest area.

[0003] Patent document DE 10 2020 110 594 A1 describes a seat assembly with an integrated seat belt restraint device. The seat backrest assembly includes a seat backrest frame having first and second lateral elements that define a backrest support section of the seat backrest frame. An upper frame element connects the first and second lateral elements of the seat backrest frame to define a headrest support section of the seat backrest frame. An upper mounting plate is coupled to the upper frame element. A retaining rod is coupled to the upper mounting plate. A retraction mechanism is operatively coupled to the backrest support section of the seat backrest frame. A mounting bracket is operatively coupled to the seat backrest frame. The seat belt includes a strap having a first section that is operatively coupled to the retraction mechanism and extends from the retraction mechanism in the interior space of the seat backrest assembly towards the retaining rod. A second section of the strap extends from the retaining rod to the mounting bracket in the interior space of the seat backrest assembly.

[0004] The vehicle seat described in the patent document is a seat with an integrated seat belt, which combines all the required functions of the seat, including the seat belt function. The seat with an integrated seat belt can be removed from the vehicle and used as a whole. In the seat with an integrated seat belt, the backrest of the seat with an integrated seat belt is fixed to the seat part or the seat substructure. The seat with an integrated seat belt includes a seat belt device as the seat belt, and the seat belt device has a seat belt retractor, also known as a seat belt winder. Two different designs are known from the prior art. The seat belt retractor is either arranged on the backrest and mainly assigned to the shoulder belt there, or the seat belt retractor is assigned to the seat substructure, especially in the side rear part of the seat substructure, or to the seat part carried by the seat substructure.

[0005] The invention relates to a seat with an integrated seat belt (Gurtintegralsitz), which includes a seat part and a backrest. The seat is equipped with a seat belt in a three-point configuration. The seat belt is deflected by a seat belt deflection element 30 (see Figure 1E and Figure 3 ) in a seat belt outlet arranged in the upper side area of the backrest (see Figure 1D and Figure 2D ). The seat belt webbing is stored, for example, in a seat belt retraction unit 3 (see Figure 1E and Figure 2E ), which is arranged in the backrest. The seat belt (not shown preliminarily) is fixed to the structure on the seat part side or the seat substructure side by a seat belt end fitting or also to the backrest side structure near the transition of the lower end of the backrest to the rear end of the seat part. The seat belt can also be fixed to a seat belt buckle connection point by a seat belt buckle, and the connection point is arranged on the side of the seat with an integrated seat belt opposite to the seat belt end fitting and is also near the transition of the lower end of the backrest to the rear end of the seat part. The seat belt is accordingly divided into two sections, namely a section as the lap belt basically between the seat belt end fitting and the closed seat belt buckle and a section as the shoulder belt between the closed seat belt buckle and the seat belt outlet.

[0006] Accordingly, the seat belt extends from the seat belt retractor unit 3 through the seat belt outlet in the first section known as the shoulder belt until the seat belt buckle. After deflecting at the seat belt buckle, the seat belt further extends through the second section known as the waist belt until the seat belt end fitting. In order for the shoulder belt to be withdrawn from the seat belt retractor unit 3 through the seat belt outlet in the upper side area of the backrest, it is technically required to integrate the seat belt retractor unit into the relatively small installation space available in the backrest, so that not only the seat belt retractor unit 3 itself finds a position, but also the structure of the backrest with the integrated seat belt retractor unit has the stability to absorb the seat belt tension force especially in the event of a collision (loading condition). The seat belt retractor unit 3 is configured with a seat belt tensioner unit 2 and a drive unit 1. In the present design, as Figure 2E shown, these units are arranged side by side in a longitudinal structure. The aforementioned seat belt retractor units together constitute the so-called seat belt retractor.

[0007] The structure of the seat belt retractor is not the subject of the present invention, but as described, it is technically required to integrate the seat belt retractor units into the relatively small installation space available in the backrest so that the seat belt retractor itself finds a position and the structure of the backrest with the integrated seat belt retractor also has stability, so as to be able to absorb the seat belt tension force acting on the seat belt retractor or the seat belt retractor units. Summary of the Invention

[0008] Therefore, the technical problem to be solved by the present invention is to design an integrated seat belt seat with a backrest, in which a seat belt retractor is integrated, the seat belt retractor is arranged in a space-saving manner and can be easily assembled, and an optimal strength combination should be formed between the backrest structure and the seat belt retractor after assembly, so that the seat belt tension force acting on the backrest structure in the event of a collision can be absorbed by the backrest structure.

[0009] The starting point of the present invention is a backrest assembly of an integrated seat belt seat, which includes a first assembly having backrest side beams (Lehnenseitenholme), and at least one backrest headrest is fixedly arranged between the backrest side beams.

[0010] According to the provisions of the present invention, the backrest assembly includes a second component, which is designed as a prefabricated seat belt retractor module. The seat belt retractor module has a backrest headboard and at least one receiving portion. The seat belt retractor module has the at least one receiving portion on its inner surface, and this inner surface faces the front headboard of the first component in the assembled state of the backrest assembly. The seat belt retractor is reversibly arranged in the at least one receiving portion. The seat belt retractor module is integrally arranged in the installation space formed in the first component in the assembled state, and this installation space is bounded by the backrest side beam and the front headboard.

[0011] In order to establish a structural connection between the first component and the second component, it is preferably provided that the second component, that is, the seat belt retractor module, is arranged in the installation space of the first component in the assembled state, and the first and second components are fixedly connected to each other in a position-fixed manner by at least one releasable connection group. Advantageously, the simple assembly of the prefabricated seat belt retractor module can be carried out and positioned in the installation space. The structure of the backrest head of the backrest is designed to be so stable that the forces acting on the seat belt retractor module and acting on the backrest structure in the force flow can be absorbed in consideration of personal safety, as described in this specification.

[0012] It is preferably provided that the front headboard has a three-dimensional U-shaped outer contour to form the installation space. The substantially flat surface of the front headboard is orthogonally bounded by elements respectively arranged on the upper side and the lower side of the end side of the headboard in the assembled state. It is hereby provided that the front headboard forms a bent shelf in the upper end region of the U-shaped outer contour and forms a hem in the lower end region of the U-shaped outer contour. The hem forms an upper side, and the horizontally arranged surface of the upper side in the installed state extends parallel to the horizontally arranged surface of the lower side of the bent upper shelf. The substantially flat and vertically arranged front headboard formed above the hem forms a vertical surface between the lower side of the shelf and the upper side of the hem.

[0013] Furthermore, it is preferably provided that the front headboard has a three-dimensional U-shaped outer contour to form the installation space. The U-shaped outer contour is characterized in that the substantially flat surface of the front headboard is orthogonally bounded by elements respectively arranged laterally on the end side of the headboard in the assembled state. The laterally arranged elements are preferably bent (or angled) side plates, and the three-dimensional contour of the side plates corresponds to the contour of the backrest side beam pointing to the side plates such that the side plates are in surface contact with the inner side of the backrest side beam in the assembled state.

[0014] Preferably, it is also provided that the at least one receiving part of the second component and / or the rear backrest headboard are detachably connected to the backrest side beam and / or the front backrest headboard by means of at least one connecting group. In other words, it is advantageously possible to replace the second component as a whole if desired.

[0015] In particular, it is preferably provided that a receiving and stabilizing plate and a receiving and stabilizing cage are arranged on the inner surface of the rear backrest headboard for stabilizing the backrest headboard and for receiving a plurality of seat belt retractor units of the seat belt retractor. By means of the arrangement of at least one receiving part or a plurality of receiving parts, a synergistic effect is advantageously achieved with respect to the stability of the rear backrest headboard, i.e. the second component as a whole, and the possibility of arranging the seat belt retractor in the second component designed as a seat belt retractor module.

[0016] According to the invention, on the assembly side, during assembly, the second component designed as a prefabricated seat belt retractor module is advantageously reversibly inserted by the worker into the installation space of the first component from the rear side of the backrest.

[0017] The invention relates to a seat with an integrated seat belt, having a backrest, which is characterized by having the aforementioned backrest assembly.

[0018] The above-described embodiments and the following description of the invention are based on directional designations such as "up", "down", "rear", "front", "vertical", "horizontal" and their derivatives in order to define the positions of the parts of the backrest assembly. Here, the normal installation position of the backrest of the seat with an integrated seat belt arranged in the interior space of a vehicle is taken as the starting point. Description of the Drawings

[0019] The invention is explained below with reference to the drawings. In the drawings:

[0020] Figures 1A to 1E A perspective view of the backrest assembly and its parts and the seat belt retractor module, seen obliquely from behind;

[0021] Figures 2A to 2E A substantially lateral view of the backrest assembly and its parts and the seat belt retractor module;

[0022] Figure 3 Shows according to Figure 1E and Figure 2E An enlarged perspective view of the seat belt retractor module, seen obliquely from the front. Detailed Description of the Invention

[0023] Figures 1A to 1E and Figures 2A to 2E The backrest assembly of the backrest head is shown in a combined view, with reference to the normal installation position of the backrest arranged substantially vertically in the interior space of a vehicle, the backrest head comprising vertical backrest side beams 10, 20.

[0024] In the present embodiment, the upper backrest side beams 10, 20 of the backrest are involved. They are arranged on a lower backrest side beam (not shown) in an inclination-adjustable manner so as to adjust the inclination of the backrest head relative to the lower backrest structure. However, as clearly pointed out, the solution according to the present invention described below can generally be applied to backrest side beams with or without upper backrest head adjustment. Therefore, only the backrest side beams 10, 20 themselves will be discussed below, rather than the "upper" backrest side beams 10, 20.

[0025] The backrest assembly according to the present invention includes backrest side beams 10, 20 and a front backrest headboard 40, and the backrest side beams and the front backrest headboard are fixedly connected to each other, particularly preferably welded to each other.

[0026] The front backrest headboard 40 is designed such that it is arranged in the front region of the backrest structure.

[0027] The front backrest headboard 40 has a three-dimensional shape and particularly closely adheres to the three-dimensional shape on the inner side of the backrest side beams 10, 20.

[0028] Through the three-dimensional contours of the backrest side beams 10, 20 and the three-dimensional contours of the front backrest headboard 40 that reproduce the contours of the backrest side beams 10, 20 in a complementary contour, a particularly stable backrest head has been ensured, in which higher forces can be absorbed. In the assembled state, the surface of the front backrest headboard 40 facing the backrest side beams 10, 20 and the surface facing the front backrest headboard 40 form a relatively large abutting surface in the region of the backrest side beams, thereby realizing the stabilization of the backrest head.

[0029] Figure 1C and Figure 2C An adapter plate 50 is shown, which is placed on the bent upper side shelf 43 of the front backrest headboard 40 and is fixedly connected to the backrest headboard 40, particularly by threaded connection, in the assembled state.

[0030] The adapter plate 50 forms a receiving portion for the headrest structural member 60. The headrest structural member is preferably also designed as a headrest plate and constitutes the basic structure of the headrest. The headrest is arranged on the backrest by means of the adapter plate 50.

[0031] As described above, Figure 1D and Figure 2D A seat belt deflection element 30 is shown, which is arranged in a deepened setting portion (Vorsehung) 44 of the bent shelf 43 on the upper side of the backrest headboard 40 in the assembled state. As can be best seen in Figure 1B , the front backrest headboard 40 is curled in the region of the installation position of the seat belt deflection element 30. This curled and deepened placement portion (Abstellung) 45 is also used to improve the stability of the front backrest headboard 40 under load.

[0032] Figure 1B and Figure 2B The views in Figure 2B clearly show that the front backrest headboard 40 also has a special three-dimensional shape, which is characterized by a front plate that transitions into a bent side plate, and the three-dimensional contour of the side plate corresponds to the contour of the backrest side beams 10, 20 that points to the side plate. In addition, the front plate is basically flat.

[0033] Figure 1B and Figure 2B The views in Figure 2B also clearly show that the front backrest headboard 40 also has a special three-dimensional shape, which is characterized in that the front backrest headboard 40 has a U-shaped shape.

[0034] The bent upper side shelf 43 is designed in the upper end region of the U-shaped shape.

[0035] Preferably, a hem 41 is designed in the lower end region of the U-shaped shape. The hem forms an upper side, and the surface that is horizontal in the installed state of the upper side extends parallel to the lower surface that is horizontal in the installed state of the bent upper side shelf 43.

[0036] In other words, the front backrest headboard 40, which is basically flat and vertically arranged in the installed state, formed above the hem 41 transitions into a horizontal region in the region of the hem 41, where the vertical surface complements the U-shaped shape of the backrest headboard 40.

[0037] The hem 41 is also designed such that a vertically arranged surface is formed below the horizontal region of the hem 41. This surface serves as a connection and abutment surface 46 for the rear backrest headboard 71, and the rear backrest headboard is part of the seat belt retractor module as will be further described.

[0038] In addition, a bent L-shaped shelf 42 extends from this connection and abutment surface 46. Besides the hem 41, the L-shaped shelf itself also serves to stabilize the front backrest headboard 40 and, as will be further described, serves as a support for the rear backrest headboard 71 in the assembled state.

[0039] The above description and the views in the figures clearly show that the front backrest headboard 40 located between the backrest side beams 10, 20 forms a stable installation space for the seat belt retractor units 1, 2, 3 of the seat belt retractor. This installation space is bounded in two spatial directions y (horizontal) and z (vertical) and has a depth when observed in the third spatial direction x (horizontal), and this depth is basically equal to the width of the backrest side beams 10, 20.

[0040] Figure 1B and Figure 2BThe view in also clearly shows that the end side of the bent upper side shelf 43 of the front backrest headboard 40, on which the adapter plate 50 is placed, pointing backward towards the rear backrest headboard 71, is substantially flush with the end side of the bent L-shaped shelf 42 pointing backward towards the rear backrest headboard 71.

[0041] The seat belt retractor module shown in Figure 1E and Figure 2E can be advantageously arranged, in particular inserted, into the mounting space defined above.

[0042] As described above, the design of the front backrest headboard 40 and its connection to the backrest side beams 10, 20 has ensured an optimal strength combination of the first backrest assembly within the backrest head of the backrest assembly.

[0043] As will be elaborated below, additionally, the insertion of the seat belt retractor module advantageously results in a further improved optimal strength combination of the backrest head of the backrest assembly.

[0044] The seat belt retractor module advantageously includes a rear backrest headboard 71, and the seat belt retractor units 1, 2, 3 are arranged on the inner side pointing towards the front backrest headboard 40 at the rear backrest headboard.

[0045] To stably fix the seat belt retractor units 1, 2, 3 to the rear backrest headboard 71, two receiving and stabilizing plates 75 and a receiving and stabilizing cage 76 are arranged on the inner side formed in the assembled state of the rear backrest headboard 71.

[0046] The rear backrest headboard 71 further includes a bent horizontal upper flange (Pfalz) 72 extending from the substantially flat plate surface vertically extending from the rear backrest headboard 71.

[0047] The rear backrest headboard 71 further includes a vertically extending bent side flange 73 extending from the substantially flat plate surface vertically extending from the rear backrest headboard 71.

[0048] The rear backrest headboard 71 further includes a flanged portion 77 extending from the substantially flat plate surface vertically extending from the rear backrest headboard 71, and this flanged portion forms a lower plate wall that closes the seat belt retractor module downward.

[0049] A vertically bent edge 74 further extends from the flanged portion 77, and this vertically bent edge forms a connecting and abutting surface 78 pointing towards the front backrest headboard 40 in the assembled state, and this connecting and abutting surface abuts against the above-mentioned vertically arranged connecting and abutting surface 46 of the front backrest headboard 40 in the assembled state.

[0050] The bent vertical fold edge 74 forms the lower end side, which, in the assembled state, is supported on the upper side of the bent L-shaped shelf 42 of the front backrest headboard 40, since the L-shaped shelf 42 constitutes a support surface for the lower fold edge 74 of the rear backrest headboard 71.

[0051] Preferably along here Figure 2B and Figure 2E The seat belt retractor module is inserted and screwed into the provided installation space along the arrow P1 between them.

[0052] In this process, once the seat belt retractor module is inserted into the installation space of the backrest head and from then on the backrest assembly is complete, the upper side of the bent L-shaped shelf 42 of the front backrest headboard 40 constitutes a support surface for the downwardly directed end side of the lower fold edge 74 of the rear backrest headboard 71.

[0053] The seat belt retractor module mainly having the rear backrest headboard 71 and the accommodation and stabilization plate 75 and the accommodation and stabilization cage 76 for accommodating the seat belt retractor units 1, 2, 3 is finally fixedly connected, in particular screwed, to the front backrest headboard 40 and / or the backrest side beams 10, 20. Here, the following main connection groups are defined, which ensure that the backrest assembly is designed to absorb very large forces in the event of a load, and all components of the backrest assembly are arranged in a position-stable manner under load.

[0054] The seat belt retractor module is connected to the backrest side beams 10, 20 and the front backrest headboard 40 by a first connection group. Here, in the present embodiment, preferably two threaded connection portions S1 are established, which fixedly connect the side fold edges 73 of the rear backrest headboard 71 to the backrest side beams 10, 20 and the front backrest headboard 40 attached inside the backrest side beams 10, 20 to each other in terms of position.

[0055] The seat belt retractor module is connected to the front backrest headboard 40 by a second connection group. Here, in the present embodiment, preferably four threaded connection portions S2 are established, which connect the lower fold edge 74 of the rear backrest headboard 71 to the rolled edge 41. In the assembled state, the connection and abutment surfaces 46 and 78 first abut against each other, while the lower end side of the bent vertical fold edge 74 is supported on the bent L-shaped shelf 42. In the assembled state, the planar abutment against the rolled edge 41 over the entire width of the backrest head also advantageously forms a very stable strength combination of the backrest assembly.

[0056] The seatbelt retractor module is connected to the front backrest headboard 40 via a third connection group. Among them, in this embodiment, it is preferably to establish four threaded connection parts S3, and the accommodation and stabilizing plate 75 and the accommodation and stabilizing cage 76 are included in these four threaded connection parts. The threaded connection part S3 at least passes through the accommodation and stabilizing plate 75, the accommodation and stabilizing cage 76 and the front backrest headboard 40. Advantageously, it is realized that the accommodation and stabilizing plate 75 and the accommodation and stabilizing cage 76 are respectively self-positioned and positioned on the front backrest headboard 40 within the seatbelt retractor module. The accommodation and stabilizing plate 75 and the accommodation and stabilizing cage 76 are preferably arranged, especially welded, on the inner side of the rear backrest headboard 71. The accommodation and stabilizing plate and the accommodation and stabilizing cage are used as stabilizing elements of the seatbelt retractor module when viewed separately. The accommodation and stabilizing plate and the accommodation and stabilizing cage advantageously serve as partitions in the assembled state, and these partitions accommodate the seatbelt retractor units 1, 2, 3 and stabilize the seatbelt retractor units relative to each other. Through the connection with the front backrest headboard 40, the accommodation and stabilizing plate and the accommodation and stabilizing cage finally serve as a strength combination of the backrest assembly together with the front backrest headboard 40 and the backrest side beams 10, 20.

[0057] Finally, the seatbelt retractor module is connected to the front backrest headboard 40 via a fourth connection group. Among them, in this embodiment, it is preferably to establish three threaded connection parts S4, and these three threaded connection parts connect the upper hem 72 of the rear backrest headboard 71 to the shelf 43 of the front backrest headboard 40, so as to also realize the fixed positioning of the seatbelt retractor module within the backrest assembly in the upper region of the backrest head.

[0058] List of reference numerals

[0059] 10, 20 Backrest side beams

[0060] 30 Seatbelt deflection element

[0061] 40 Front backrest headboard

[0062] 41 Hem

[0063] 42 Shelf

[0064] 43 Shelf

[0065] 44 Setting part

[0066] 45 Placing part

[0067] 46 Connection and abutting surface

[0068] 50 Adapter plate

[0069] 60 Headrest structural member

[0070] 70 Seatbelt retractor module

[0071] 71 Rear backrest headboard

[0072] 72 Upper hemming

[0073] 73 Side hemming

[0074] 74 Lower hemming

[0075] 75 Receiving and stabilizing plate

[0076] 76 Receiving and stabilizing cage

[0077] 77 Flanging part

[0078] 78 Connecting and abutting surface

[0079] S1 Threaded connection part

[0080] S2 Threaded connection part

[0081] S3 Threaded connection part

[0082] S4 Threaded connection part

[0083] 1 Drive unit

[0084] 2 Seat belt pretensioner unit

[0085] 3 Seat belt retractor unit

[0086] P1 Arrow (insertion direction)

Claims

1. A backrest assembly of an integrated seatbelt seat, comprising a first assembly, the first assembly having backrest side beams (10, 20), and at least one backrest headrest being fixedly arranged between the backrest side beams, characterized in that, The backrest assembly includes a second assembly designed as a prefabricated seat belt retractor module, wherein the seat belt retractor module has a rear backrest headboard (71) and at least one receiving portion, wherein the seat belt retractor module has the at least one receiving portion on its inner surface, which inner surface faces the front backrest headboard (40) of the first assembly in the assembled state of the backrest assembly, and the seat belt retractor is reversibly arranged in the at least one receiving portion, wherein the seat belt retractor module is integrally arranged in the installation space formed in the first assembly in the assembled state, and the installation space is bounded by the backrest side beams (10, 20) and the front backrest headboard (40).

2. The backrest assembly according to claim 1, wherein, The front backrest headboard (40) has a three-dimensional U-shaped outer contour so as to form the installation space, wherein the substantially flat surface of the front backrest headboard (40) is orthogonally bounded by elements arranged on the upper side and the lower side respectively at the end sides of the backrest headboard (40) in the assembled state.

3. The backrest assembly according to at least one of the preceding claims, characterized in that, The front backrest headboard (40) forms a bent shelf (43) in the upper end region of the U-shaped outer contour and forms a hem (41) in the lower end region of the U-shaped outer contour, and the hem forms an upper side, and the horizontally arranged surface of the upper side in the installed state extends parallel to the horizontally arranged surface of the lower side of the bent upper side shelf (43), wherein the front backrest headboard (40) which is substantially flat and vertically arranged in the installed state and formed above the hem (41) forms a vertical surface between the lower side of the shelf (43) and the upper side of the hem (41).

4. The backrest assembly according to at least one of the preceding claims, characterized in that, The front backrest headboard (40) has a three-dimensional U-shaped outer contour so as to form the installation space, wherein the substantially flat surface of the front backrest headboard (40) is orthogonally bounded by elements arranged laterally respectively at the end sides of the backrest headboard (40) in the assembled state.

5. The backrest assembly according to at least one of the preceding claims, characterized in that, The laterally arranged elements are bent side plates, and the three-dimensional contour of the side plates corresponds to the contour of the backrest side beams (10, 20) facing the side plates such that the side plates are planar and closely attached to the inner sides of the backrest side beams (10, 20) in the assembled state.

6. The backrest assembly according to at least one of the preceding claims, characterized in that, The at least one receiving portion and / or the rear backrest headboard (71) of the second assembly are detachably connected to the backrest side beams (10, 20) and / or the front backrest headboard (40) by at least one connecting group.

7. The backrest assembly according to at least one of the preceding claims, characterized in that, A receiving and stabilizing plate (75) and a receiving and stabilizing cage (76) are arranged on the inner surface of the rear backrest headboard (71) for stabilizing the rear backrest headboard (71) and for receiving a plurality of seat belt retractor units (1, 2, 3) of the seat belt retractor.

8. The backrest assembly according to at least one of the preceding claims, characterized in that, The second assembly designed as a prefabricated seat belt retractor module can be reversibly inserted into the installation space of the first assembly from the rear side of the backrest.

9. An integrated seatbelt seat, characterized in that, There is a backrest assembly according to at least one of claims 1 to 8.

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