Abstract:
The invention relates to a backrest ( 3 ) for a rear seat or a rear bench ( 1 ) of a motor vehicle, in particular a backrest ( 3 ) produced in accordance with a method according to one of the preceding claims, wherein the backrest ( 3 ) has upholstery ( 4 ) and a back plate ( 5, 5 B) which is arranged behind the upholstery ( 4 ) and extends essentially over the entire backrest ( 3 ), wherein at least two thirds of the back plate ( 5, 5 B) are composed of a rolled metal sheet.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a U.S. national counterpart application of international application serial No. PCT/EP2007/006716 filed Jul. 30, 2007, which claims priority to German Patent Application No. 102006041528.0 filled Sep. 5, 2006 and to German Patent Application No. 102006041524.8 filed Sep. 5, 2006. 
     FIELD OF THE INVENTION 
     The invention refers to a backrest for a rear seat and/or a rear bench-type seat of a motor vehicle. Furthermore, the invention refers to a rear seat or a rear bench-type seat including such aforementioned backrest. Also, the invention refers to a method for manufacturing such aforementioned backrest. 
     BACKGROUND INFORMATION 
     U.S. Pat. No. 6,260,924 B1 comprises a modular rear seat system for a vehicle which comprises a type A seat back frame having a fastening facility for a central shoulder safety belt, and a type B seat back frame of small width. The left ends of the seat back frames are essentially similar regarding their sizes and shapes, and the right ends of the seat back frames are essentially similar regarding their sizes and shapes, as well. The symmetry regarding the ends makes it possible that the modular rear seat system forms a “40/40 Configuration” with two type B seat back frames for smaller vehicles and a “40/60 Configuration” with one type A and one type B seat back frame, each, for medium size vehicles and a “60/60 Configuration” with two type A seat back frames for larger vehicles. Moreover, the dual nature of the modular rear seat system enables the formation of a “40/60 Configuration” in left hand steered vehicles of one vehicle (production) line and of a “60/40 Configuration” in right hand steered vehicles. 
     DE 10 2005 005 485 discloses a rear-section rest frame for a rear-section rest part of a vehicle seat including at least one base plate, a left and a right vertically extending lateral hat-shaped section and an upper and a lower, transversely extending hat-shaped section, wherein the hat-shaped sections are welded onto the front side of the base plate, wherein the rear-section rest frame has cushion channels for attaching a cushion and/or a cover along its lateral edges and its upper and lower edges, wherein the hat-shaped sections are formed rectilinearly, wherein the lateral hat-shaped sections are welded to the hat-shaped sections extending in the transverse direction, and wherein lateral cushion channels are formed on the lateral hat-shaped sections. 
     DE 20 2004 019 560 U1 discloses a rest frame for a vehicle seat having one or several hinged rest frame parts, wherein each rest frame part comprises a lower hat-shaped section extending in the transverse direction, an upper hat-shaped section extending in the transverse direction, several vertical bars each being welded to the hat-shaped sections at their ends, a rear metal plate which is welded to the rear side of the hat-shaped sections and/or the vertical bars, and two outer joints, each of which has a bearing block to be attached to the vehicle chassis and a joint bolt received in the bearing block and in the lower hat-shaped section, wherein the vertical bars are welded to the hat-shaped sections free of positive-fit by means of their ends. 
     DE 101 42 981 A1 discloses a (back)rest-cushion-carrier for a motor vehicle rear bench-type seat having a base metal plate and at least one reinforcing frame at least partially extending circumferentially and being fixedly connected to the base plate. 
     DE 202 04 180 U1 discloses a structural carrier for a motor vehicle seat having bars for reinforcement, wherein the bars are connected with a base metal plate forming box-shaped sections. 
     EP 0 875 4 16 A2 discloses a tiltable backrest for a rear seat of a vehicle, wherein the bearing structure of the backrest is essentially formed by a single extruded profile, the direction of manufacture of which extends in the direction of the width extension of the rear seat, and wherein a lateral closing element is provided in a lateral region of the extruded profile. 
     DE 101 26 014 C1 discloses a hinged backrest for a rear seat of a motor vehicle, wherein the backrest, when viewed in the direction of its width, is formed essentially continuously and is manufactured as a hollow extrusion-pressed profile with at least one profile chamber, and wherein the direction of extrusion of the extrusion-pressed profile extends in the direction of the height of the backrest. 
     DE 30 46 427 A1 discloses a backrest for a vehicle seat having a lateral part. 
     DE 101 53 156 A1 discloses a cushion carrier for a motor vehicle seat, said carrier having a single metal base plate for each independently movable part of the cushion carrier, in which base metal plate beads are formed which cohere with each other as an at least partially circumferential channel, wherein cohering beads have differing depths. 
     WO 01/89875 A1 discloses a bench-type seat for a vehicle having a tiltable backrest being subdivided into two portions of which at least one is formed by a plate on which a profile is arranged, said profile being composed of modules which, together, form a frame. 
     It is an object of the invention to reduce the costs for manufacturing a backrest for a rear seat or a rear bench-type seat of a motor vehicle, or those for the manufacture of a rear seat or a rear bench-type seat of a motor vehicle. 
     SUMMARY OF THE INVENTION 
     The aforementioned object is achieved by a backrest for a rear seat or a rear bench-type seat of a motor vehicle wherein the backrest comprises a cushion and a back metal plate arranged behind the cushion, which back metal plate extends essentially over the whole backrest, wherein the back metal plate comprises a base plate and a lateral part which is fixedly connected with, in particular welded to the base plate at least on one side (directly or indirectly), wherein one side of the lateral part, which one side is facing away from the side of the lateral part which is attached to the base plate, is adapted to the contour of a wheel housing and/or a chassis of the motor vehicle. 
     Herein, it is particularly provided that the base plate and the lateral part are arranged essentially in the same plane or in parallel planes, in particular at a rather small distance with respect to each other. In this context “a rather small distance” is particularly to mean a distance in the order of the thickness of the metal plate of the lateral part or of the base plate. A base plate or a lateral part is regarded to be arranged in the plane in which the essential portion of its surface extends. 
     According to the gist of the invention, a back metal plate will extend essentially over the whole backrest particularly in cases in which it extends in two orthogonal directions essentially over the whole backrest. According to the gist of the invention, a back metal plate will extend essentially over the whole backrest particularly when it extends essentially over the whole backrest viewed in the transverse direction of the motor vehicle as well as in the vertical direction thereof. A back metal plate will extend, according to the gist of the invention, essentially over the whole backrest particularly when it extends over essentially the whole backrest in its longitudinal direction as well as in the vertical direction. 
     In an embodiment of the invention the width of the lateral part will vary by at least 20% when viewed in the transverse direction of the motor vehicle. In a further embodiment of the invention the lateral part is designed asymmetrically in three directions which are orthogonal with respect to each other. According to the gist of the invention, a metal plate or lateral part will be regarded designed to be asymmetrical in three directions lying orthogonal with respect to each other particularly if there is no direction in which the plate, or the lateral part is symmetrical. 
     In a further embodiment of the invention, a cushion channel for attaching the cushion and/or a cover is formed in one of the edges of the lateral part, wherein, according to a further embodiment of the invention, the lateral part is bordered by the cushion channel on at least two of its sides or on three sides. 
     In a further expedient embodiment of the invention a cushion channel for attaching the cushion and/or a cover is formed in one edge of the base plate, or one cushion channel, each, for attaching the cushion and/or the cover is formed in two opposing edges of the base plate. It is also possible that an essentially vertically extending cushion channel is formed in the base plate. 
     In a further embodiment of the invention the base plate is a rolled metal plate. A rolled metal plate, in the sense of the invention, in particular is a metal plate manufactured by rolling. Herein, an essential or a by far major portion of the (final) contour of the metal plate is not manufactured by pressing or stamping, but by rolling. 
     In a further expedient embodiment of the invention the lateral part is a pressed metal plate. A pressed metal plate, in the sense of the invention, is in particular a metal plate manufactured by pressing or stamping. Herein, an essential or a by far major portion of the contour of the metal plate is manufactured by pressing or stamping. 
     In a further embodiment of the invention the lateral section is composed of a material differing from the material of the base plate, wherein it is particularly provided that the base plate has a lower weight per area unit than the lateral part. In a further expedient embodiment of the invention the lateral part is composed of a material having a lower tensile strength than the material of the base plate. In further embodiment of the invention the thickness of the metal plate of the lateral part is larger than the thickness of the metal plate of the base plate. In a further embodiment of the invention the size of the area of the base plate is at least double as large as the size of the area of the lateral part. 
     In a further embodiment of the invention the back metal plate comprises a profile carrier in particular designed as a hat-shaped section on a side of the base plate facing away from the lateral part. Herein, and in a further expedient embodiment of the invention, the profile carrier comprises a cushion channel for attaching the cushion and/or a cover. 
     In a further expedient embodiment of the invention a profile extending in the transverse direction of the motor vehicle, or a bead extending in the transverse direction of the motor vehicle, is formed in the base plate. 
     In a further embodiment of the invention the base plate is composed of steel having a tensile strength of at least 800 N/mm 2 . 
     The aforementioned object is moreover achieved by a backrest for a rear seat or a rear bench-type seat of a motor vehicle—said backrest in particular including one or several of the aforementioned features—, wherein the backrest comprises a cushion and a back metal plate arranged behind the cushion and extending essentially over the whole backrest, wherein the back metal plate comprises a base plate and a lateral part connected with, in particular welded to the base plate, and wherein the width of the lateral part varies by at least 20%, when viewed in the transverse direction of the motor vehicle. 
     Herein, it is particularly provided that the base plate and the lateral part are arranged essentially in the same plane or in parallel planes, in particular at a very small distance from each other. In this sense, a very small distance is particularly regarded to be a distance in the order of the thickness of the metal plate of the lateral part or of the base plate. Herein, a base plate or a lateral part is regarded to be arranged in the plane in which the essential portion of its surface is extending. 
     According to the gist of the invention, a back metal plate will, in particular, extend essentially over the whole backrest if it extends essentially over the whole backrest in two orthogonal directions. According to the gist of the invention, a back metal plate will, in particular, extend over the whole backrest if it extends essentially over the whole backrest in the transverse direction of the motor vehicle as well as in the vertical direction. A back metal plate, in the sense of the invention, will, in particular, extend essentially over the whole backrest if it extends over essentially the whole backrest in the longitudinal direction as well as in the vertical direction thereof. 
     In a further embodiment of the invention the lateral part is designed to be unsymmetrical in three directions which are orthogonal with respect to each other. In the sense of the invention, a metal plate or a lateral part is in particular regarded to be formed asymmetrically in three directions orthogonal with regard to each other if there is no direction in which the metal plate or the lateral part is symmetrical. 
     In a further embodiment of the invention, a cushion channel for attaching the cushion and/or a cover is formed in one of the edges of the lateral part, wherein, according to a further embodiment of the invention, the lateral part is bordered by the cushion channel on at least two of its sides or on three sides. 
     In a further expedient embodiment of the invention a cushion channel for attaching the cushion and/or a cover is formed in one edge of the base plate, or one cushion channel, each, for attaching the cushion and/or the cover is formed in two opposing edges of the base plate. It is also possible that an essentially vertically extending cushion channel is formed in the base plate. 
     In a further embodiment of the invention the base plate is a rolled metal plate. A rolled metal plate, in the sense of the invention, is, in particular, a metal plate manufactured by rolling. Herein, an essential or by far major portion of the (final) contour of the metal plate is not generated by pressing or stamping, but by rolling. 
     In a further expedient embodiment of the invention the lateral part is a pressed metal plate. A pressed metal plate, in the sense of the invention, is, in particular, a metal plate manufactured by pressing or stamping. Herein, an essential or by far major portion of the contour of the metal plate is generated by pressing or stamping. 
     In a further embodiment of the invention the lateral part is composed of a material differing from that of the base plate, wherein, in particular, it is provided that the base plate has a lower weight per area unit than the lateral part. In a further expedient embodiment of the invention the lateral part is composed of a material having a lower tensile strength than the material of the base plate. In a further embodiment of the invention the thickness of the metal plate of the lateral part is larger than the thickness of the metal plate of the base plate. In a further embodiment of the invention the size of the area of the base plate is at least double as large as the size of the area of the lateral part. 
     In a further embodiment of the invention the back metal plate comprises a profile carrier in particular designed as a hat-shaped section on a side of the base plate facing away from the lateral part. In a further expedient embodiment of the invention, the profile carrier, in this context, comprises a cushion channel for attaching the cushion and/or a cover. 
     In a further expedient embodiment of the invention a profile extending in the transverse direction of the motor vehicle, or a bead extending in the transverse direction of the motor vehicle, is formed in the base plate. 
     In a further embodiment of the invention the base plate is composed of steel having a tensile strength of at least 800 N/mm 2 . 
     The aforementioned object is moreover achieved by a backrest for a rear seat or a rear bench-type seat of a motor vehicle, said backrest, in particular, including one or several of the aforementioned features, wherein the backrest comprises a cushion and a back metal plate arranged behind the cushion and extending essentially over the whole backrest, wherein the back metal plate comprises a base plate and a lateral part connected with, in particular welded to the base plate, and wherein the lateral part is designed to be asymmetrical in three directions which are orthogonal with respect to each other. In the sense of the invention, a metal plate or a lateral part will be regarded to be designed asymmetrical in three directions lying orthogonal with respect to each other particularly when there is no direction in which the plate or the lateral part is symmetrical. 
     Herein, it is, in particular, provided that the base plate and the lateral part are arranged essentially in the same plane or in parallel planes, in particular at a very small distance from each other. In this sense, a very small distance is, in particular, regarded to be a distance in the order of the thickness of the metal plate of the lateral part or of the base plate. Herein, a base plate or a lateral part is regarded to be arranged in the plane in which the essential portion of its surface is extending. 
     In the sense of the invention, a back metal plate will extend essentially over the whole backrest particularly in cases when it extends essentially over the whole backrest in two orthogonal directions. In the sense of the invention, a back metal plate will extend essentially over the whole backrest particularly if it extends essentially over the whole backrest in the transverse direction of the motor vehicle as well as in the vertical direction. A back metal plate, in the sense of the invention, will extend essentially over the whole backrest particularly if it extends over essentially the whole backrest in the longitudinal direction thereof as well as in the vertical direction. 
     In a further embodiment of the invention, a cushion channel for attaching the cushion and/or a cover is formed in one of the edges of the lateral part, wherein, according to a further embodiment of the invention, the lateral part is bordered by the cushion channel on at least two of its sides or on three sides. 
     In a further expedient embodiment of the invention a cushion channel for attaching the cushion and/or a cover is moulded  16  into one edge of the base plate, or one cushion channel, each, for attaching the cushion and/or the cover is formed in two opposing edges of the base plate. It is also possible that an essentially vertically extending cushion channel is formed in the base plate. 
     In a further expedient embodiment of the invention the base plate is a rolled metal plate. A rolled metal plate, in the sense of the invention, is, in particular, a metal plate manufactured by rolling. Herein, an essential or by far major portion of the (final) contour of the metal plate is not generated by pressing or stamping, but by rolling. 
     In a further expedient embodiment of the invention the lateral part is a pressed metal plate. A pressed metal plate, in the sense of the invention, is, in particular, a metal plate manufactured by pressing or stamping. Herein, an essential or by far major portion of the contour of the metal plate is generated by pressing or stamping. 
     In a further embodiment of the invention the lateral section is composed of a material differing from that of the base plate, wherein it is, in particular, provided that the base plate has a lower weight per area unit than the lateral part. In a further expedient embodiment of the invention the lateral part is composed of a material having a lower tensile strength than the material of the base plate. In a further embodiment of the invention the thickness of the metal plate of the lateral part is larger than the thickness of the metal plate of the base plate. In a further embodiment of the invention the size of the area of the base plate is at least double as large as the size of the area of the lateral part. 
     In a further embodiment of the invention the back metal plate comprises a profile carrier in particular designed as a hat-shaped section on a side of the base plate facing away from the lateral part. In a further expedient embodiment of the invention, the profile carrier, in this context, comprises a cushion channel for attaching the cushion and/or a cover. 
     In a further expedient embodiment of the invention a profile extending in the transverse direction of the motor vehicle, or a bead extending in the transverse direction of the motor vehicle, is formed in the base plate. 
     In a further embodiment of the invention the base plate is composed of steel having a tensile strength of at least 800 N/mm 2 . 
     The aforementioned object is, moreover, achieved by a method for manufacturing a backrest for a rear seat or a rear bench-type seat of a motor vehicle, in particular a backrest comprising one or several of the aforementioned features, wherein a base plate is generated, in particular rolled, wherein a lateral part is pressed such that one side of the lateral part is adapted to the contour of a wheel housing and/or a chassis of the motor vehicle such that the width of the lateral part varies by at least 20%, in the transverse direction of the motor vehicle, and/or that the lateral part is designed asymmetrical in three directions which are orthogonal with respect to each other, and wherein the base plate and the lateral part are connected fixedly with each other (directly or indirectly) to form a back metal plate for the backrest, which back metal plate extends essentially over the whole backrest. 
     In an embodiment of the invention the base plate and the lateral part are welded to each other. 
     In a further embodiment of the invention, for manufacturing the base plate, a steel strip is rolled, wherein the base plate is cut-off from the rolled steel strip. 
     In a further embodiment of the invention the steel strip is rolled such that a cushion channel for attaching the cushion and/or a cover is formed in at least one longitudinal edge. 
     In a further expedient embodiment of the invention the back metal plate is padded. 
     A rear seat or a rear bench-type seat of a motor vehicle may comprise a divided or divisible backrest. In this case a backrest for a rear seat of a motor vehicle is, in the sense of the invention, in particular a portion of the divided or divisible backrest. 
     The aforementioned object is moreover achieved by a method for manufacturing a backrest for a rear seat or a rear bench-type seat of a motor vehicle, wherein a steel strip is rolled, wherein a base plate is cut-off from the rolled steel strip, wherein a lateral part is pressed, and wherein the base plate and the lateral part are fixedly connected with each other to form a back metal plate for the backrest, which plate extends essentially over the whole backrest. Herein, the base plate, in particular, comprises at least two thirds of the back metal plate. 
     In the sense of the invention, a back metal plate will extend essentially over the whole backrest particularly in cases in which it extends essentially over the whole backrest in two orthogonal directions. In the sense of the invention, a back metal plate will extend essentially over the whole backrest particularly when it extends essentially over the whole backrest in the transverse direction of the motor vehicle as well as in the vertical direction. A back metal plate, in the sense of the invention, will, in particular, extend essentially over the whole backrest when it extends over essentially the whole backrest in the longitudinal direction as well as in the vertical direction. 
     A rear seat or a rear bench-type seat of a motor vehicle may comprise a divided or divisible backrest. In this case, a backrest for a rear seat of a motor vehicle is, in the sense of the invention, in particular a portion of the divided or divisible backrest. 
     In an embodiment of the invention the back metal plate is padded. In a further embodiment of the invention the steel strip is rolled such that a cushion channel for attaching a padding and/or a cover is formed in at least one longitudinal edge. In a further expedient embodiment of the invention the steel strip is rolled such that one cushion channel, each, for attaching a padding and/or a cover is formed in its longitudinal edges. In a further embodiment of the invention the steel strip is rolled such that at least one profile or bead is formed in its longitudinal direction. 
     The aforementioned object is moreover achieved by a method for manufacturing a backrest for a rear seat or a rear bench-type seat of a motor vehicle, wherein a steel strip is rolled such that a cushion channel for attaching a cushion/padding and/or a cover is formed in at least one longitudinal edge, wherein a base plate is cut-off from the rolled steel strip, and wherein the base plate is integrated in the backrest as a back metal plate or as a portion of a back metal plate, which back metal plate will extend essentially over the whole backrest. Herein, the base plate comprises, in particular, at least two thirds of the back metal plate. 
     In the sense of the invention, a back metal plate will, in particular, extend essentially over the whole backrest in cases in which it extends in two orthogonal directions essentially over the whole backrest. In the sense of the invention, a back metal plate will extend essentially over the whole backrest particularly when it extends essentially over the whole backrest in the transverse direction of the motor vehicle as well as in the vertical direction. A back metal plate will extend, in the sense of the invention, essentially over the whole backrest particularly when it extends over essentially the whole backrest in its longitudinal direction as well as in the vertical direction. 
     A rear seat or a rear bench-type seat of a motor vehicle may comprise a divided or divisible backrest. In this case, a backrest for a rear seat of a motor vehicle is, in the sense of the invention, in particular a portion of the divided or divisible backrest. 
     In an embodiment of the invention the back metal plate is padded(-up). In a further expedient embodiment of the invention the steel strip is rolled such that one cushion channel, each, for attaching the cushion/padding and/or the cover is formed in its longitudinal edges. In a furthermore expedient embodiment of the invention the steel strip is rolled such that at least one profile or bead is formed in its longitudinal direction. 
     The aforementioned object is moreover solved by a method for manufacturing a backrest for a rear seat or a rear bench-type seat of a motor vehicle, wherein a steel strip is rolled, wherein a base plate is cut-off from the rolled steel strip, and wherein the base plate is padded with a cushion/padding. 
     A rear seat or a rear bench-type seat of a motor vehicle may comprise a divided or divisible backrest. In this case, a backrest for a rear seat of a motor vehicle is, in the sense of the invention, in particular a portion of the divided or divisible backrest. 
     Herein, the base plate according to an embodiment extends over at least two thirds of the backrest. 
     In an embodiment of the invention the steel strip is rolled such that in at least one longitudinal edge a cushion channel for attaching the cushion and/or a cover is formed. In a further expedient embodiment of the invention the steel strip is rolled such that one cushion channel, each, for attaching the cushion/padding and/or the cover is formed in its longitudinal edges. In a further embodiment of the invention the steel strip is rolled such that at least one profile or bead is formed in its longitudinal direction. 
     The aforementioned object is moreover achieved by a backrest for a rear seat or a rear bench-type seat of a motor vehicle, in particular a backrest manufactured according to an aforementioned method, wherein the backrest comprises a cushion/padding and a back metal plate arranged behind the cushion and extending essentially over the whole backrest, and wherein at least two thirds of the back metal plate are composed of a rolled metal plate. A rolled metal plate, in the sense of the invention, is, in particular, a metal plate manufactured by rolling. Herein, an essential or by far major portion of the (final) contour of the metal plate is not manufactured by pressing or stamping, but by rolling. 
     In the sense of the invention, a back metal plate will extend essentially over the whole backrest particularly in cases when it extends in two orthogonal directions essentially over the whole backrest. In the sense of the invention, a back metal plate will extend essentially over the whole backrest particularly when it extends essentially over the whole backrest in the transverse direction of the motor vehicle as well as in the vertical direction. In the sense of the invention, a back metal plate will extend essentially over the whole backrest particularly when it extends essentially over the whole backrest in its longitudinal direction as well as in the vertical direction. 
     A rear seat or a rear bench-type seat of a motor vehicle may comprise a divided or divisible backrest. In this case, a backrest or a rear seat of a motor vehicle is, in the sense of the invention, in particular a portion of the divided or divisible backrest. 
     In an embodiment of the invention a cushion channel for attaching the cushion/padding and/or a cover is formed in a rolled edge of the back metal plate. In a further expedient embodiment of the invention the back metal plate has a rolled base plate comprising at least two thirds of the back metal plate, which base plate is fixedly connected with a pressed lateral part. A pressed metal plate, in the sense of the invention, is, in particular, a metal plate manufactured by pressing or stamping. Herein, an essential or by far major portion of the contour of the metal plate is manufactured by pressing or stamping. In a further embodiment of the invention a cushion channel for attaching the cushion and/or the cover is formed in an edge of the base plate. There may be provided a cushion channel of the type which extends essentially vertically. Herein, essentially vertically means a direction which is essentially vertical when the backrest is in an upright position. 
     In a further embodiment of the invention a cushion channel for attaching the cushion and/or the cover is formed in an edge of the lateral part, wherein the lateral part, in a further embodiment of the invention, is bordered by the cushion channel on at least two sides and/or on three sides. 
     In a further expedient embodiment of the invention the lateral part is composed of a material having a lower tensile strength than the material of the base plate. In a furthermore embodiment of the invention the base plate is composed of steel having a tensile strength of at least 800 N/mm 2 . In a furthermore expedient embodiment of the invention the thickness of the metal plate of the lateral part is larger than the thickness of the metal plate of the base plate. In a furthermore embodiment of the invention the size of the area of the base plate is at least double as large as the size of the area of the lateral part. 
     In a further expedient embodiment of the invention the back metal plate comprises, on one side, a profile carrier which is particularly designed as a hat-shaped section, wherein the profile carrier according to an embodiment comprises a cushion channel for attaching the cushion/padding and/or the cover. This cushion channel, in an expedient embodiment of the invention, extends essentially vertically. 
     In a furthermore embodiment of the invention a profile extending in the transverse direction of the motor vehicle or a bead extending in the transverse direction of the motor vehicle is formed in the back metal plate. 
     The aforementioned object is furthermore achieved by a rear seat or a rear bench-type seat having a backrest as mentioned before. 
     A back metal plate, in the sense of the invention, is, in particular, a metal plate which helps maintaining a so-called space of survival (cf. DE 100 22 984 A1). 
     A motor vehicle, in the sense of the invention, is in particular a land vehicle to be used individually in road traffic. Motor vehicles, in the sense of the invention, are, in particular, not restricted to land vehicles having combustion engines. 
     Further advantages and details may be taken from the following description of specific examples of embodiments. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  shows, by way of a simplified principle representation, a cross-section of an example of an embodiment of a rear seat or a rear bench-type seat of a motor vehicle; 
         FIG. 2  shows, by way of a perspective representation, an example of embodiment of a back metal plate for the backrest of a rear seat or a rear bench-type seat according to  FIG. 1 ; 
         FIG. 3  shows a top view of the back metal plate according to  FIG. 2 ; 
         FIG. 4  shows an exploded view of the back metal plate according to  FIG. 2 ; 
         FIG. 5  shows a cross-sectional representation of the back metal plate according to  FIG. 2 ; 
         FIG. 6  shows a further example of embodiment of a back metal plate; 
         FIG. 7  shows a top view of the back metal plate according to  FIG. 6 ; 
         FIG. 8  shows an exploded view of the back metal plate according to  FIG. 6 ; 
         FIG. 9  shows a cross-sectional representation of the back metal plate according to  FIG. 6 ; 
         FIG. 10  shows a further example of embodiment of a back metal plate; 
         FIG. 11  shows a top view of the back metal plate according to  FIG. 10 ; 
         FIG. 12  shows an exploded view of the back metal plate according to  FIG. 10 ; 
         FIG. 13  shows a cross-sectional representation of the back metal plate according to  FIG. 10 ; 
         FIG. 14  shows a further example of embodiment of a back metal plate; 
         FIG. 15  shows a top view of the back metal plate according to  FIG. 14 ; 
         FIG. 16  shows an exploded view of the back metal plate according to  FIG. 14 ; 
         FIG. 17  shows a cross-sectional representation of the back metal plate according to  FIG. 14 ; 
         FIG. 18  shows a further example of embodiment of a back metal plate; 
         FIG. 19  shows a top view of the back metal plate according to  FIG. 18 ; 
         FIG. 20  shows an exploded view of the back metal plate according to  FIG. 18 ; 
         FIG. 21  shows a further example of embodiment of a back metal plate; 
         FIG. 22  shows a top view of the back metal plate according to  FIG. 21 ; 
         FIG. 23  shows an exploded view of the back metal plate according to  FIG. 21 ; 
         FIG. 24  shows a cross-sectional representation of the back metal plate according to  FIG. 21 ; 
         FIG. 25  shows a cut-out from, respectively the cross-sectional representation according to  FIG. 24 ; 
         FIG. 26  shows an example of embodiment of a method for manufacturing a backrest for a rear seat or for a rear bench-type seat of a motor vehicle; 
         FIG. 27  shows an example of embodiment regarding a selection of lateral parts; 
         FIG. 28  shows an example of embodiment of an equipment for the rolling of base plates; 
         FIG. 29  shows an example of embodiment regarding a selection of base plates; 
         FIG. 30  shows an example of embodiment of a base plate prior to moulding an essentially vertical cushion channel; 
         FIG. 31  shows an example of embodiment of the base plate according to  FIG. 30  following the moulding of the essentially vertical cushion channel; 
         FIG. 32  shows a further example of embodiment of a base plate prior to moulding an essentially vertical cushion channel; and 
         FIG. 33  shows an example of embodiment of the base plate according to  FIG. 32  following the moulding of the essentially vertical cushion channel. 
     
    
    
     DETAILED DESCRIPTION 
       FIG. 1  shows an exemplified embodiment of a cross-section through an example of embodiment of a rear seat or a rear bench-type seat  1  of a motor vehicle by way of a simplified principle representation. The rear seat or the rear bench-type seat  1  comprises a sitting portion  2  and a backrest  3 . The backrest  3  comprises a cushion or padding  4  and a back metal plate  5  arranged behind the cushion  4 . A lining  6 , such as for example a cover, may be provided behind the back metal plate  5 . The backrest  3  may comprise a (non-shown) frame connected to the back metal plate  5 . Examples of such frames are e.g. disclosed in DE 10 2005 005 485, DE 20 2004 019 560 U1 and DE 101 42 981 A1. The rear seat or the rear bench-type seat  1  moreover comprises a (non-shown) head-rest. The elements of  FIG. 1  have been drawn considering simplicity and clearness and are thus not necessarily shown to scale. Thus, for example the scale of some of the elements of  FIG. 1  has been exaggerated with regard to other elements in order to improve comprehension of the example of embodiment. 
       FIG. 2  shows an example of embodiment of the back metal plate  5  by way of a perspective representation,  FIG. 3  shows the back metal plate  5  by way of a top view,  FIG. 4  shows the back metal plate  5  by way of an exploded representation, and  FIG. 5  shows the back metal plate  5  by way of a cross-sectional representation. The back metal plate  5  comprises a rolled base plate  10  and a pressed lateral part  11  which has been welded to the base plate  10  by butt joint in the area designated by reference numeral  13 . The side of the lateral part  11  facing away from the side of the lateral part  11  connected to the base plate  10  is adapted to the contour  50  of a wheel housing and/or a chassis of the motor vehicle. Herein, the lateral part  11  is according to an embodiment designed such that its width varies by at least 20% when seen in the transverse direction of the motor vehicle. In the shown example of embodiment the width of the lateral part  11  varies by 60% when seen in the transverse direction of the motor vehicle, i.e. the smallest width B 2  of the lateral part  11  is 40% of the largest width B 1  of the lateral part  11 . The surface of the base plate  10  is at least double as much as the surface of the lateral part  11 . 
     A cushion channel  111  for attaching the cushion  4  and/or a cover has been formed in a portion of the edge of the lateral part  11 , which channel encloses the lateral part  11  along three sides. Also, one cushion channel  102  or  101 , each, for attaching the cushion  4  and/or a cover has been formed in the upper and the lower edges, respectively, of the base plate  10 . The back metal plate  5  comprises a profile carrier  12  designed as a hat-shaped section on the side of the base plate  10  facing away from the lateral part  11 , which profile carrier  12  comprises a cushion channel  121  for attaching the cushion  4  and/or a cover. The profile carrier  12  is welded to the base plate  10  at locations which have been designated by reference numerals  14  and  15 . 
       FIG. 6  shows, by way of a perspective representation, an example of embodiment of a back metal plate  5 A forming an alternative regarding back metal plate  5 .  FIG. 7  shows a top view of back metal plate  5 A,  FIG. 8  shows an exploded representation of back metal plate  5 A, and  FIG. 9  shows a cross-sectional representation of back metal plate  5 A. Back metal plate  5 A comprises a rolled base plate  10 A corresponding to base plate  10 , and a pressed lateral part  11 A corresponding to lateral part  11 , with the lateral part  11 A overlapping with base plate  10 A in an area designated by reference numeral  20 A and being welded to base plate  10 A in this area  20 A. The side of the lateral part  11 A which is facing away from the side of lateral part  11 A connected to the base plate  10 A is also adapted to the contour  50  of a wheel housing and/or a chassis of the motor vehicle. Herein, lateral part  11 A is also according to an embodiment designed such that its width varies at least by 20% when seen in the transverse direction of the motor vehicle. The area of the base plate  10 A is at least double as large as the area of the lateral part  11 A. A cushion channel  111 A corresponding to cushion channel  111  is formed in a portion of the edge of lateral part  11 A. The base plate  10 A comprises cushion channels  101 A and  102 A corresponding to cushion channels  101  and  102 , respectively. Moreover, the back metal plate  5 A comprises a profile carrier  12 A corresponding to profile carrier  12  and comprising a cushion channel  121 A. The profile carrier  12 A is welded to the base plate  10 A at locations designated by reference numerals  14 A and  15 A. 
       FIG. 10  shows, by way of a perspective representation, an example of embodiment of a back metal plate  5 B forming an alternative regarding back metal plate  5 A.  FIG. 11  shows a top view of back metal plate  5 B,  FIG. 12  shows an exploded representation of back metal plate  5 B, and  FIG. 13  shows a cross-sectional representation of back metal plate  5 B. Back metal plate  5 B comprises a rolled base plate  10 B corresponding to base plate  10 A, and a pressed lateral part  11 B corresponding to lateral part  11 A, with the lateral part  11 B overlapping with base plate  10 B in an area designated by reference numeral  20 B and being welded to base plate  10 B in this area  20 B. The side of the lateral part  11 B which is facing away from the side of lateral part  11 B connected to the base plate  10 B is also adapted to the contour  50  of a wheel housing and/or a chassis of the motor vehicle. Herein, lateral part  11 B is also according to an embodiment designed such that its width varies at least by 20% when seen in the transverse direction of the motor vehicle. The area of the base plate  10 B is at least double as large as the area of the lateral part  11 B. Profiles or beads  21 B—formed by rolling the base plate  10 B—are formed in the base plate  11 B and extend in the transverse direction of the motor vehicle. The base plate  10 B comprises cushion channels  101 B and  102 B corresponding to cushion channels  101 A and  102 A, respectively. A cushion channel  111 B corresponding to cushion channel  111 A is formed in a portion of the edge of lateral part  11 B. Moreover, the back metal plate  5 B comprises a profile carrier  12 B corresponding to profile carrier  12 A and comprising a cushion channel  121 B. The profile carrier  12 B is welded to the base plate  10 B at locations designated by reference numerals  14 B and  15 B. 
       FIG. 14  shows, by way of a perspective representation, an example of embodiment of a back metal plate  5 C forming an alternative regarding back metal plate  5 B.  FIG. 15  shows a top view of back metal plate  5 C,  FIG. 16  shows an exploded representation of back metal plate  5 C, and  FIG. 17  shows a cross-sectional representation of back metal plate  5 C. Back metal plate  5 C comprises a rolled base plate  10 C corresponding to base plate  10 B, which base plate  10 C has profiles or beads  21 C—formed by the rolling of the base plate  10 C—extending in the transverse direction of the motor vehicle, and a pressed lateral part  11 C corresponding to lateral part  11 B, with the lateral part  11 B overlapping with base plate  10 C in an area designated by reference numeral  20 C and being welded to base plate  10 B in this area  20 C. Herein, and in contrast to the arrangement of the back metal plate  5 B the lateral part  11 C is arranged above the base plate  10 C in area  20 C. To this end, the lateral part  11 C has respective recesses  22 C corresponding with the profiles or beads  21 C. The side of the lateral part  11 C which is facing away from the side of lateral part  11 C connected to the base plate  10 C is adapted to the contour  50  of a wheel housing and/or a chassis of the motor vehicle. Herein, lateral part  11 C is also according to an embodiment designed such that its width varies at area least by 20% when seen in the transverse direction of the motor vehicle. The area of the base plate  10 C is at least double as large as the area of the lateral part  11 C. A cushion channel  111 C corresponding to cushion channel  111 B is formed in a portion of the edge of lateral part  11 B. The base plate  10 C comprises cushion channels  101 C and  102 C corresponding to cushion channels  101 B and  102 B. Moreover the back metal plate  5 C comprises a profile carrier  12 C corresponding to profile carrier  12 B and comprising a cushion channel  121 C. The profile carrier  12 C is welded to the base plate  10 C at locations designated by reference numerals  14 C and  15 C. 
       FIG. 18  shows a perspective representation of a further example of embodiment of a back metal plate  5 D forming an alternative regarding back metal plate  5 B.  FIG. 19  shows a top view of the back metal plate  5 D and  FIG. 20  shows an exploded view of back metal plate  5 D. The back metal plate  5 D comprises a rolled base plate  10 D corresponding to base plate  10 B and having profiles or beads  21 D extending in the transverse direction of the motor vehicle, and a pressed lateral part  11 D corresponding to the lateral part  11 B and being welded to the base plate  10 D. Profiles  24 D corresponding to the profiles or beads  21 D are formed in the lateral part  11 D. Furthermore, a profile  25 D extending orthogonally with respect to the profiles or beads  21 D is formed in the lateral part  11 D. In an alternative but less expedient arrangement a profile corresponding to profile  25 D may be welded to the lateral part  11 D as well. 
     The side of the lateral part  11 D which is facing away from the side of lateral part  11 D connected to the base plate  10 D is adapted to the contour  50  of wheel housing and/or a chassis of the motor vehicle. Herein, lateral part  11 D is also according to an embodiment designed such that its width varies at least by 20% when seen in the transverse direction of the motor vehicle. The area of the base plate  10 D is at least double as large as the area of the lateral part  11 D. A cushion channel  111 D corresponding to cushion channel  111 B is formed in a portion of the edge of lateral part  11 D. The base plate  10 D comprises cushion channels  101 D and  102 D corresponding to cushion channels  101 B and  102 B. Moreover, the back metal plate  5 D comprises a profile carrier  12 D corresponding to profile carrier  12 B and comprising a cushion channel  121 D. The profile carrier  12 D is welded to the base plate  10 D. 
       FIG. 21  shows, by way of a perspective representation, an example of an embodiment of a back metal plate  5 E forming an alternative regarding back metal plate  5 .  FIG. 22  shows a top view of back metal plate  5 E,  FIG. 23  shows an exploded representation of back metal plate  5 E, and  FIG. 24  and  FIG. 25  show back metal plate  5 E by way of a cross-sectional representation, wherein  FIG. 25  shows a cut-out from  FIG. 24  which has been marked by a circle designated by reference numeral  30 E in  FIG. 24 . Back metal plate  5 E comprises a rolled base plate  10 E corresponding to base plate  10 , and a pressed lateral part  11 E corresponding to lateral part  11 , with the lateral part  11 E overlapping with base plate  10 E in an area designated by reference numeral  26 E and being welded to the base plate  10 E in this area  26 E. The side of the lateral part  11 E which is facing away from the side of lateral part  11 E connected to the base plate  10 E is adapted to the contour  50  of a wheel housing and/or a chassis of the motor vehicle as well. Herein, the lateral part  11 E is also according to an embodiment designed such that its width varies at least by 20% when seen in the transverse direction of the motor vehicle. The area of the base plate  10 E is at least double as large as the area of the lateral part  11 E. 
     The back metal plate  5 E further comprises a profile carrier  12 E corresponding to profile carrier  12  and designed as a hat-section, as well as a profile carrier  28 E which is shaped as a hat-section as well and is welded to the base plate  10 E in area  26 E as well in an area designated by reference numeral  27 E. The profile carrier  12 E is welded to the base plate  10 E at locations designated by reference numerals  14 E and  15 E. 
     A cushion channel  111 E corresponding to cushion channel  111  is formed in a portion of the edge of lateral part  11 E. Moreover, the base plate  10 E comprises cushion channels  101 E and  102 E corresponding to cushion channels  101  and  102 . Profile carrier  12 E comprises a further cushion channel  121 E corresponding to cushion channel  121 . 
     In an embodiment the lateral parts  11 ,  11 A,  11 B,  11 C,  11 D, and  11 E are composed of a material having less tensile strength than the material of the base plates  10 ,  10 A,  10 B,  10 C,  10 D and  10 E. Herein, the base plates  10 ,  10 A,  10 B,  10 C,  10 D, and  10 E are composed, according to another expedient embodiment, of steel having a tensile strength of at least 800 N/mm 2 . According to another embodiment the thicknesses of the metal plates of the lateral parts  11 ,  11 A,  11 B,  11 C,  11 D, and  11 E are larger than the plate thicknesses of the base plates  10 ,  10 A,  10 B,  10 C,  10 D, and  10 E. According to another expedient embodiment the base plates  10 ,  10 A,  10 B,  10 C,  10 D, and  10 E are designed symmetrically such that a lateral part corresponding to the lateral parts  11 ,  11 A,  11 B,  11 C,  11 D, and  11 E may be welded to a corresponding base plate  10 ,  10 A,  10 B,  10 C,  10 D, and  10 E either on the left or on the right hand side. 
       FIG. 26  shows an example of embodiment of a process for manufacturing a backrest for a rear seat or a rear bench-type seat of a motor vehicle such as for example one of the backrests  5 ,  5 A,  5 B,  5 C,  5 D, and  5 E. Herein, a lateral part, which corresponds to one of the lateral parts  11 ,  11 A,  11 B,  11 C,  11 D, and  11 E, is pressed in a step  40 . Herein, lateral parts  61 ,  62 ,  63 ,  64 ,  65 ,  66  can be pressed as represented in  FIG. 27 , which parts are adapted to different contours of wheel housings. Herein, each one of the lateral parts  61 ,  62 ,  63 ,  64 ,  65 ,  66  may be designed corresponding to lateral parts  11 ,  11 A,  11 B,  11 C,  11 D, and  11 E, for example. 
     In a step  41  for manufacturing a base plate corresponding to one of the base plates  10 ,  10 A,  10 B,  100 ,  10 D, and  10 E a steel strip  71  is rolled—by means of an equipment or apparatus  70  represented by way of example in  FIG. 28 , or by means of rollers  72  provided in such an equipment or apparatus  70 —, wherein the cushion channels  101 ,  102 ,  101 A,  102 A,  101 B,  102 B,  101 C,  102 C,  101 D,  102 D,  101 E and  102 E as well as the beads  21 B,  21 C, and  21 D are formed by rolling, into the steel strip  71  and thus into the subsequent base plate  10 ,  10 A,  10 B,  10 C,  10 D, and  10 E, respectively. Step  41  is followed by a step  42 , in which—by means of a cutting device  73 —the base plate  10 ,  10 A,  10 B,  100 ,  10 D, and  10 E, respectively, is cut-off from the rolled steel strip  71 . Herein, base plates  81 ,  82 ,  83 ,  84  of differing lengths may be cut, as has been represented in  FIG. 29 . Herein, each of the base plates  81 ,  82 ,  83 ,  84  may be designed corresponding to the base plates  10 ,  10 A,  10 B,  10 C,  10 D, or  10 E. 
     A step  43  follows, in the course of which one base plate  81 ,  82 ,  83 , or  84 , each, and one lateral part  61 ,  62 ,  63 ,  64 ,  65 , or  66 , each, respectively selected from a selection  60  of lateral parts  61 ,  62 ,  63 ,  64 ,  65 , and  66 , and from a selection  80  of base plates  81 ,  82 ,  83 ,  84 ,  85 , and  86 , respectively, are welded, screwed or riveted to each other to form a back metal plate  5 ,  5 A,  5 B,  5 C,  5 D, or  5 E. Moreover, the profile carrier  12 ,  12 A,  12 B,  12 C,  12 D, or  12 E and  28 E is welded to a base plate  10 ,  10 A,  10 B,  100 ,  10 D, and  10 E and the lateral part  11 E, respectively. For producing a back metal plate for a non-separated or non-separable backrest it is according to an embodiment provided that, instead of the profile carrier  12 ,  12 A,  12 B,  12 C,  12 D, or  12 E provided with a cushion channel  121 ,  121 A,  121 B,  121 C,  121 D or  121 E, a lateral part corresponding to lateral part  11 ,  11 A,  11 B,  11 C,  11 D, and  11 E (however, mirror-inverted), respectively, is welded, screwed or riveted to the base plate  10 ,  10 A,  10 B,  100 ,  10 D and  10 E, respectively. If necessary, a frame is welded onto the back metal plate  5 ,  5 A,  5 B,  5 C,  5 D, or  5 E. Step  43  is followed by a step  44  in which the back metal plate  5 ,  5 A,  5 B,  5 C,  5 D, and  5 E is padded(-up). 
     As an alternative of step  43  steps  40  or  42  are followed by a step  45  in which (as represented, by way of example, in  FIG. 30  and  FIG. 32 ) a flap  150 F or flaps  150 G is/are cut to form a base plate  10 F and  10 G, respectively, and a vertical cushion channel  103 F and  103 G, respectively, is shaped from flaps  150 F or  150 G, respectively (as shown, by way of example, in  FIG. 31  and  FIG. 33 ). Herein, the base plate  10 F shown in  FIG. 31  may replace the base plates  10 ,  10 A or  10 E, and the cushion channel  103 F may replace the cushion channels  121 ,  121 A or  121 E. Cushion channels corresponding to cushion channels  101 ,  101 A and  101 E, respectively, and  102 ,  102 A and  102 E, respectively, are designated by reference numerals  101 F and  102 F, respectively. The base plate  100  shown in  FIG. 33  may replace base plates  10 B,  10 C or  10 D, respectively, and the cushion channel  103 G may substitute cushion channels  121 B,  121 C or  121 D, respectively. Cushion channels corresponding to cushion channels  101 B,  101 C, and  101 D, respectively, and  102 B,  102 C, and  102 D, respectively, are designated by reference numerals  101 G and  102 G, respectively, and beads corresponding to beads  21 B,  21 C and  21 D are designated by reference numeral  21 G. Step  45  is followed by step  46 , in which one base plate  81 ,  82 ,  83 , or  84  and one lateral part  61 ,  62 ,  63 ,  64 ,  65 , or  66 , each, from a selection  60  of lateral parts  61 ,  62 ,  63 ,  64 ,  65 ,  66  and from a selection  80  of base plates  81 ,  82 ,  83 ,  84 , respectively, are welded, screwed or riveted to each other to form a back metal plate. Step  45  is followed by step  44 , in which the back metal plate is padded.