Backrest element for a vehicle seat

Abstract

The invention relates to a backrest element for a vehicle seat, comprising at least one frame element formed from a tubular element and forming at least one part of the backrest element, wherein the contour of the at least one frame element is given by a plurality of bends of the tubular element and is formed such that at least one inner surface is enclosed by the tubular element.

Description

Technical Field

[0001] The present invention relates to a backrest element for a vehicle seat including a frame element and a vehicle seat including such a backrest element. Background Technology

[0002] This type of vehicle seat is suitable for commercial vehicles such as trucks, tractors, or construction machinery or similar vehicles. Typically, this backrest element is welded together from various individual components. For example, several spars are welded together by connecting plates or sheets and / or reinforcing plates or sheets. The disadvantages here are the number of components and the number or total length of welds. Reducing the weight of the backrest element is also desirable. Another disadvantage is that the prefabricated individual components mean little flexibility in redesigning the backrest. Summary of the Invention

[0003] The object of the present invention is to provide a backrest element that overcomes or at least reduces the above-mentioned disadvantages.

[0004] The backrest element of the present invention achieves this objective. Advantageous embodiments will be derived from the embodiments.

[0005] The core idea of ​​the present invention is a backrest element for a vehicle seat, wherein the backrest element includes at least one frame element formed from a tubular element and shaped as at least one part of the backrest element, wherein the profile of the at least one frame element is given by a plurality of bends in the tubular element and is configured such that at least one inner surface is surrounded by the tubular element.

[0006] By using at least one frame element formed as part of the backrest element through multiple bends of a tubular component, multiple welding joints can be avoided. Furthermore, the number of parts to be welded is significantly reduced. Consequently, the weight of the backrest element is also reduced. In addition, the number of tools required to manufacture the backrest element is greatly reduced. By using modern CNC bending machines, the contour of the frame element can be easily reshaped if needed, thus achieving a high degree of design flexibility to meet the requirements of the backrest element.

[0007] In engineering mechanics, bending refers to the mechanical change in the geometry of a slender component (such as a tubular element). Typical bending, caused by static and dynamic stresses, is a change in the curvature of the centerline or surface compared to the curvature of the element in a stress-free state.

[0008] The backrest elements extend along the longitudinal axis (X), the width axis (Y), and the height axis (Z).

[0009] According to a particularly advantageous embodiment, the backrest element includes a lower region adapted and designed to provide support in the lumbar region of the occupant. Advantageously, the backrest element includes an upper region adapted and designed to provide support in the shoulder region of the occupant and / or for receiving or providing a headrest.

[0010] Advantageously, the frame elements are formed from a single tubular component. In this case, the monolithic design means that all parts are made from a single, unified component.

[0011] According to another particularly advantageous embodiment, the frame element includes a belt portion designed and adapted to accommodate belt devices. Preferably, the belt portion is located in the upper portion, region, of the backrest element. Advantageously, at the lower end of the belt portion along the longitudinal axis X, two portions of the tubular element are substantially adjacent to each other along the height axis Z. These overlapping portions of the tubular element can also be referred to as the winding of the tubular element. The overlapping portions of the tubular element provide local reinforcement to the frame or backrest element. Because the belt devices are located on the belt portion, increased forces are applied to the belt portion in the event of an accident or collision. In particular, the forces generated are especially large in the regions where the portions of the tubular element overlap. Typically, a large portion of the force acts forward along the height direction Z. The advantageous juxtaposition of the first and second portions of the tubular element along the height axis Z precisely takes into account the effect of this force.

[0012] According to another preferred embodiment, the belt portion is formed in such a way that it defines a first inner surface. Advantageously, a first plate-like element is at least partially disposed within this first inner surface. Thus, the first plate-like element may fill the entire first inner surface or only a portion thereof. Preferably, the first plate-like element is attached to the belt portion by means of a material connection. Thus, a material connection exists between the portion of the tubular element that forms the belt portion, respectively defining or surrounding the first inner surface, and the first plate-like element. This material connection is preferably a welded connection. Alternatively or cumulatively, additional connections may be provided between the first plate-like element and the belt portion, such as non-direct connections and / or direct connections in the form of threaded connections, riveted connections, snap-fit ​​connections, etc. The first plate-like element is advantageously made of metal, and for example, a sheet of metal. Further advantageously, the first plate-like element has means for fastening the belt device, such as holes, protrusions, receptacles, etc., or combinations of said means.

[0013] According to another preferred embodiment, the upper region of the backrest element includes a frame element. Preferably, only one frame element is disposed in the upper region of the backrest element. Advantageously, the frame element is arranged on the lower backrest element portion forming the lower region of the backrest element. The lower backrest element portion may be formed, for example, as a standard element and include a corresponding receiving portion for the frame element. Thus, the backrest element will include only one frame element, which is at least an outer frame for the upper region of the backrest element. Advantageously, a strap portion of the frame element is further disposed in the upper portion.

[0014] Advantageously, the strap portion, as well as the portion suitable for receiving or forming a headrest and / or for supporting the shoulder area, is thus formed from a single, integral tubular element. However, embodiments without the strap portion are conceivable, which can be used in vehicle seats without integrated straps. The frame element, including the upper region of the backrest element, is formed solely by bending of the tubular element. The frame element can be flexibly formed through a bending process and is therefore adaptable to various configurations of the lower backrest element portion.

[0015] It is also conceivable that the lower backrest element includes a second frame element, which is formed by a second tubular element and whose outline is given by at least a plurality of bends in the tubular element.

[0016] According to another advantageous embodiment, the lower region and the upper region of the backrest element include at least one frame element. Advantageously, only one frame element is provided. Preferably, the single frame element, formed by only a single tubular element, thus forms at least one outer frame for the backrest element. Preferably, the single frame element includes a strap portion. However, embodiments without a strap portion are also conceivable, which can be used for vehicle seats without integrated straps.

[0017] Preferably, the frame element can form the outer frame of the backrest element, and other elements, such as support plates, support sheets, or support pillars, are arranged on the outer frame. Compared with conventional backrest elements, backrest elements with this frame element can be manufactured more efficiently and also have a lower weight.

[0018] According to another advantageous embodiment, the lower portion of the frame element has two annular segments spaced apart along the width axis Y. Preferably, each of these annular segments surrounds a second inner surface. Advantageously, a second plate-like element is at least partially arranged in or on each of the two second inner surfaces. The corresponding lateral second plate-like elements can thus fill the entire corresponding second inner surface or only a portion thereof. Preferably, the corresponding second plate-like elements are arranged on the corresponding annular segments by means of a material connection. Thus, a material connection exists between the corresponding second plate-like elements and the portions of the tubular elements that form the corresponding annular segments or define or surround the corresponding second inner surfaces. This material connection is preferably a welded connection. Alternatively or cumulatively, additional connections, such as force-locking and / or form-locking connections in the form of threaded connections, riveted connections, snap-fit ​​connections, etc., can be provided between the corresponding second plate-like elements and the corresponding annular segments. The corresponding second plate-like elements are advantageously made of metal, and for example, sheet metal. Furthermore, it is advantageous that the corresponding second plate-shaped element has a corresponding device capable of arranging the tilting device, such as a hole, opening, protrusion, or a combination of the aforementioned devices.

[0019] Advantageously, the corresponding annular segment includes a third portion of the tubular element extending downward along the longitudinal axis X and a fourth portion of the tubular element extending upward along the longitudinal axis X.

[0020] Preferably, the third portion is connected to the fourth portion via a bent fifth portion of the tubular element. In this respect, it is advantageous that the third and fourth portions are spaced apart along the height axis Z in the lower portion of the annular segment. Thus, the second inner surface lies between the third and fourth portions. In the upper region of the annular segment, the third and fourth portions are adjacent to each other. Furthermore, it is advantageous to provide a transverse portion of the tubular element that extends along the width axis Y between the upper portions of the two annular segments. Advantageously, the bending of the fifth portion and thus the creation of the annular segment is achieved by bending the transverse portion upwards by approximately 180° from a plane parallel to the plane spanned by the longitudinal axis X and the width axis Y, such that the transverse portion adjoins a further upward portion of the tubular element.

[0021] Advantageously, all adjacent portions of the tubular elements of the frame element are joined by means of a material connection. This material connection is preferably a welded connection. Alternatively or cumulatively, further connections can be provided between the corresponding portions of the tubular elements, such as non-direct connections and / or direct connections in the form of threaded connections, riveted connections, snap-fit ​​connections, etc. This connection ensures increased stability of the frame element.

[0022] Advantageously, at least one additional plate-like element and / or support strut is arranged on the frame element. The additional plate-like element may be arranged in the lower region of the frame element and serves to support the lumbar region of the occupant. This plate-like element may be made of metal, and for example, may be a sheet of metal. Of course, additional support plates or support struts may be provided on the frame element. Furthermore, additional elements may be arranged or provided on the frame element as fastening devices, such as holes, openings, protrusions, etc.

[0023] This objective is further addressed by a vehicle seat having a backrest element according to one of the above embodiments. The vehicle seat may be equipped with all the features described above in the context of the backrest element, individually or in combination with each other, or vice versa.

[0024] This objective is further addressed by a method for manufacturing a backrest element for a vehicle seat. The method includes the following steps: -Provide tubular components; -The tubular element is bent multiple times using a first tube bending machine to form a preform; - Use a rod-shaped auxiliary tool; - Bending the preform around the rod-shaped auxiliary tool so that the lower end of the preform reaches the middle part of the preform.

[0025] Preferably, the first pipe bending machine is a CNC pipe bending machine.

[0026] Advantageously, the method further includes at least one of the following steps: - Preferably, adjacent portions of tubular elements are connected by means of welded joints; - Preferably, at least one plate-shaped element and / or support column are arranged by means of a welded joint.

[0027] Therefore, the described method has the same advantages and implementation schemes as combining the aforementioned backrest elements and / or vehicle seats, individually or in combination. Attached Figure Description

[0028] Further advantages, objects, and features of the invention will be explained in the following description with reference to the accompanying drawings. In various embodiments, similar components may have the same reference numerals.

[0029] These figures show:

[0030] Figure 1 A backrest element according to the prior art is shown;

[0031] Figure 2 The framework elements according to one embodiment are shown;

[0032] Figure 3A backrest element according to one embodiment is shown;

[0033] Figure 4 A frame element according to another embodiment is shown;

[0034] Figure 5 A backrest element according to another embodiment is shown;

[0035] Figure 6 A backrest element according to another embodiment is shown;

[0036] Figure 7a The force applied to the vehicle seat during the collision is shown;

[0037] Figure 7b The force applied to the frame element is shown;

[0038] Figure 7c The deformation of the frame elements during the collision simulation is shown;

[0039] Figure 8 A schematic diagram of the manufacturing process of the backrest components is shown;

[0040] Figure 9 A preform of the frame element is shown;

[0041] Figure 10 A vehicle seat with frame elements according to one embodiment is shown. Detailed Implementation

[0042] Figure 1 A backrest element 1 in the prior art is shown. This backrest element 1 is adjusted according to other elements, such as trim, covers, reclining chairs, cover accessories, etc. These elements are not shown in further description. Of course, such elements can still be provided in the illustrated embodiment. Figure 1 The backrest element 1 shown is composed of a large number of individual parts, which are welded together in the form of rods and various metal sheets.

[0043] exist Figures 2 to 6 , Figure 7b and Figures 8 to 10 The image shows a backrest element 1 for a vehicle seat 100. The backrest element 1 includes at least one frame element 2, which is formed by a tubular element 3 and shaped as at least one part of the backrest element 1. The outline of the at least one frame element 2 is given by a plurality of bends 4 of the tubular element 3 and shaped such that at least one inner surface 5 is surrounded by the tubular element 3.

[0044] The backrest element 1 and the frame element 2 extend along the longitudinal axis X, the width axis Y, and the height axis Z. As can be seen from the figure, the frame element 2 includes multiple bends 4. These bends 4 are marked with corresponding reference numerals only by way of example; not all bends 4 are identified by reference numerals.

[0045] The backrest element 1 includes a lower region 1a and an upper region 1b, the lower region 1a being adapted and intended to provide support in the lumbar region of the occupant, and the upper region 1b being adapted and intended to provide support in the shoulder region of the occupant and / or receive or provide a headrest.

[0046] All embodiments of the frame element 2 shown in the figure include a belt portion 7, which is used for and adapted to accommodate belt devices. The belt portion 7 is disposed in the upper region 1b of the backrest element 1. However, the arrangement of the belt portion 7 is not intended to limit generality. Embodiments without this belt portion 7 are also conceivable. Such a backrest element 1 would be used for a vehicle seat 100 without integrated belts.

[0047] The belt portion 7 has an upper portion 7b, which is substantially rectangular in shape. Therefore, the belt portion 7 in the upper portion 7b is formed by an inner portion 20 and an outer portion 21 of the tubular element 3. These two portions 20, 21 are connected to each other via a second transverse portion 22 of the tubular element 3. The inner portion 20 and the outer portion 21 of the tubular element 3 are spaced apart from each other along the width axis Y in the upper portion 7b. Towards the lower end 7a of the belt portion 7, the inner portion 20 and the outer portion 21 extend together in a V-shape along the width axis Y. Furthermore, the inner portion 20 and the outer portion 21 extend outward in opposite directions along the height axis Z until they join the first portion 8 and the second portion 9 of the tubular element 3. In the lower end 7a of the belt portion 7, along the longitudinal axis X, the two portions 8, 9 of the tubular element 3, in the form of the first portion 8 and the second portion 9, are substantially adjacent to each other along the height axis Z. Therefore, the first portion 8 and the second portion 9 are intertwined or twisted together. Advantageously, these adjacent first parts 8 and second parts 9 are welded together.

[0048] The belt portion 7 is further formed in such a way that it defines the first inner surfaces 5, 5a. At least partially, a first plate-like element 10 is arranged in the first inner surfaces 5, 5a. The first plate-like element 10 is thus fixed to the belt portion 7 or the inner portion 20 and the outer portion 21 of the tubular element 3 by means of a welded joint. The belt assembly can then be fixed to the first plate-like element 10. For this purpose, the first plate-like element 10 has corresponding devices in the form of holes, protrusions, openings, etc.

[0049] according to Figure 2 and Figure 3The first embodiment shown provides a frame element 2 that forms a frame for the upper region 1b of the backrest element 1. Therefore, the frame element 2 is adapted and intended to receive a head support. The frame element 2 can be disposed on the lower backrest element portion 11 forming the lower region 1a of the backrest element 1. This can be achieved... Figure 3 As seen in the image, such a lower backrest element portion 11 may include standard elements advantageously welded together. Alternatively, the lower backrest element portion 11 may include an additional frame element 2, which is formed of a tubular element 3.

[0050] Furthermore, the frame element 2 includes the strip portion 7 as described above. In this embodiment, the inner portion 20 of the tubular element 3 extends to the first end 3a of the tubular element. The first end 3a is adjacent to and advantageously welded to the second transverse portion 22 of the tubular element 3. The second transverse portion 22 of the tubular element 3 is part of a third transverse portion 23 that extends straight along the entire extension of the width axis Y of the frame element 2. As described above, the outer portion 21 is incorporated into the second portion 9 of the tubular element 3. The second portion 9 then extends to the second end 3b of the tubular element 3.

[0051] Opposite to the third transverse portion 23 along the longitudinal axis X is the fourth transverse portion 24 of the tubular element 3, which has a straight central portion along the width axis Y, each central portion merging next to it into a substantially U-shaped bend 25. The first U-shaped bend 25 merges into the first portion 8. The second U-shaped bend 25 connects to the third transverse portion 23 via a lateral portion 26. By means of the two U-shaped bends 25, the frame element 2 can be arranged or secured to the lower backrest element portion 11.

[0052] The third transverse portion 23, the fourth transverse portion 24, the lateral portion 26, and the strip portion 7 surround the third inner surface 5, 5c.

[0053] according to Figure 4 , Figure 5 , Figure 6 , Figure 7b , Figure 8 and Figure 10 In the illustrated embodiment, the lower region 1a and upper region 1b of the backrest element 1 include at least one frame element 2, wherein only one frame element 2 is provided, formed or bent from an integral tubular element 3. Also in this embodiment, the frame element 2 includes a band portion 7 as described above, which further includes an inner portion 20, an outer portion 21, a second transverse portion 22, a first portion 8, and a second portion 9 of the tubular element 3. These portions operate as described above.

[0054] Also in this embodiment, the first portion 8 and the second portion 9 are adjacent to each other along the height axis Z. Furthermore, according to this embodiment, the frame element 2 includes a third transverse portion 23 extending straight along the width axis Y. However, unlike the first embodiment, here the second transverse portion 22 is not part of the third transverse portion 23. Instead, the third transverse portion 23 is arranged above and abuts the second transverse portion 22 along the longitudinal axis X. Advantageously, the two transverse portions 22, 23 are welded together. The third transverse portion 23 leads to a first end 3a of the tubular element 3, which is therefore positioned above the second transverse portion 22. The second portion 9 of the tubular element 3 further leads to a second end 3b of the tubular element 3.

[0055] The lower portion 2a of frame element 2 has two annular segments 12 spaced apart along the width axis Y. Each annular segment 12 surrounds a second inner surface 5, 5b. Figure 5 As can be seen, the corresponding second plate-shaped element 13 is at least partially disposed in or on the second inner surfaces 5, 5b. Preferably, the corresponding second plate-shaped element 13 is welded to the annular segment 12. The second plate-shaped element 13 has means for arranging tilting devices, such as holes, openings, protrusions, or combinations thereof.

[0056] The corresponding annular segment 12 includes a third portion 14 of the tubular element 3 extending downward along the longitudinal axis X and a fourth portion 15 of the tubular element 3 extending upward along the longitudinal axis X. The corresponding third portion 14 is connected to the corresponding fourth portion 15 via a curved fifth portion 16 of the tubular element 3.

[0057] In the lower portion 12a of the annular segment 12, the third portion 14 and the fourth portion 15 are spaced apart along the height axis Z. In the upper portion 12b of the annular segment 12, the third portion 14 and the fourth portion 15 are adjacent to each other. Preferably, the third portion 14 and the fourth portion 15 are welded together in the upper portion 12b. With this arrangement, the second inner surfaces 5, 5b are closed.

[0058] One of the two third portions 14 merges into the first portion 8 along the longitudinal axis X. The second portion 9 thus extends along the longitudinal axis X and further along the third portion 14 until it leads to the second end 3b. The other third portion 14 merges into the lateral portion 26 along the longitudinal axis X, and the lateral portion 26 in turn merges into the third transverse portion 23.

[0059] Furthermore, a first transverse portion 17 is provided for the tubular element 3, which extends along the width axis Y between the upper portions 12b of the two annular segments 12. For example, it can be seen that in Figure 4In the middle, the two fourth portions 15 bend toward the corresponding third portion 14, such that they rest on the third portion 14 in the upper portion 12b. The first transverse portion 17 is thus arranged above the third portion 14 along the height axis Z. Furthermore, the first transverse portion 17 is arranged substantially parallel to the third transverse portion 23 and further opposite to it.

[0060] The first transverse portion 17, the third transverse portion 23, the lateral portion 26, and the strip portion 7 thus surround the third inner surface 5, 5c.

[0061] exist Figure 5 As can be seen, a first plate-shaped element 10 is disposed in the belt portion 7. Furthermore, another plate-shaped element 18 is arranged between the two annular segments 12. This plate-shaped element 18 is used to support the lumbar region of the occupant. Similarly, a support strut 19 is disposed between the lateral portion 26 and the belt portion 7 to increase stability in this area. Therefore, Figure 5 The backrest element 1 shown consists of 7 parts and weighs 5.32 kg. It is estimated that manufacturing requires approximately 30 welds. The weld length is estimated to be 985 mm. In comparison, Figure 1 The backrest component 1 comprises 15 parts and weighs 5.36 kg. Manufacturing requires 68 welds. The estimated weld length is 2467 mm.

[0062] exist Figure 6 In the middle, the backrest and existing technology Figure 4 The frame elements 2 are superimposed graphically. For example, it can be seen that the first transverse pillar 17 is on the horizontal plane of the supporting pillar 19, which would make the latter redundant.

[0063] Figure 7a The backrest and corresponding force applied during the collision are shown in the prior art. Figure 7b The force is shown introduced through the frame element 2 in the seat base (not shown). Force 27 is applied such that a force of 1 is applied along the third transverse portion 23 and along the first transverse portion 17. A force of 2 is applied downward along the longitudinal axis X in the belt portion 7. A force of 3 is applied in the annular segment 12 located below the belt portion 7. A force of 2 is applied in the opposite annular segment 12. The force 27 applied by the armrest (not shown) has been taken into consideration. Figure 7c The deformation of frame element 2 during the collision simulation is shown.

[0064] In frame element 2, the critical point 28 where maximum deformation and force occur is reinforced by three overlapping portions, namely, a first portion 8, a second portion 9, and a fourth portion 15. Therefore, frame element 2 has an extremely stable structure.

[0065] Figure 10A vehicle seat 100 with a backrest element 2 and a seat component 101 is shown.

[0066] The backrest element 1 can be provided by means of a method for manufacturing a backrest element 1 for a vehicle seat 100. The method includes the following steps: a) Provide tubular element 3; b) Using a first tube bending machine, preferably a CNC tube bending machine, the tubular element 3 is bent several times to produce a preform 29; c) Apply rod-shaped auxiliary tool 30; d) Bend the preform 29 around the rod-shaped auxiliary tool 30 such that the lower end 29a of the preform 29 reaches the middle portion 29b of the preform 29.

[0067] exist Figure 8 The process is illustrated schematically in the image. Figure 9 The preform 29 is shown in further detail. The bent portions 4 of the preform 29 are shown and labeled C1 to C15. The bent portions 4 are bent in ascending order by a first tube bending machine.

[0068] In step a), advantageously, bends 4C1 to C9 are first generated. Then, a 180° rotation is performed using a first robot. The remaining bends 4C15 to C10 are then generated, but bend 4C13 is not generated. The preform 29 is now removed from the tube bending machine by a second robot, which preferably includes two clamps. Now, bend 4C13 is bent using the tube bending machine.

[0069] Then apply the rod-shaped auxiliary tool 30. See Figure 8 (See inset illustration.) Finally, in step d), the preform 29 is bent around the rod-shaped auxiliary tool 30 such that the lower end 29a of the preform 29 is brought to the middle portion 29b of the preform 22.

[0070] Advantageously, the method further includes at least one of the following steps: - Preferably, the adjacent portions of the tubular element 3 are connected by means of a welded joint; - Preferably, at least one plate-shaped element 18 and / or support column 19 are arranged by means of a welded joint.

[0071] The diameter of the tubular element 3 is advantageously in the range of 10 to 40 mm, more preferably between 15 mm and 25 mm, and even more preferably 20 mm. The wall thickness is preferably in the range of 0.5 mm to 3 mm, more preferably between 1 mm and 2.5 mm, and even more preferably 1.5 mm.

[0072] The applicant reserves the right to claim all features essential to the invention disclosed in the application documents, provided that such features, individually or in combination, are novel compared to the prior art. It should be further noted that individual drawings also depict features that may be advantageous in themselves. Those skilled in the art will readily recognize that specific features described in the drawings may also be advantageous without employing further features of those drawings. Furthermore, those skilled in the art will recognize that combinations of several features shown in a single drawing or different drawings may also produce advantages.

[0073] List of reference numerals 1. Backrest components; 1a Lower area of ​​the backrest element; 1b Upper area of ​​the backrest element; 2. Frame components; 2a The lower part of the frame element; 3. Tubular elements; 3a The first end of the tubular element; 3b The second end of the tubular element; 4. Bending section; 5. Inner surface; 5a First inner surface; 5b Second inner surface; 5c Third inner surface; 7. With part; 7a The lower end of the section; 7b The upper part of the belt section; 8. The first part of the tubular element; 9. The second part of the tubular element; 10. First plate-shaped element; 11. Lower backrest components; 12 Annular segments; 12a The lower part of the annular segment; 12b Upper part of the annular segment; 13. Second plate-shaped element; 14. The third part of the tubular element; 15. The fourth part of the tubular element; 16. The fifth part of the tubular element; 17. The first transverse portion of the tubular element; 18 plate elements; 19. Supporting pillars; 20. The internal portion of a tubular element; 21. The outer portion of a tubular element; 22. The second transverse portion of the tubular element; 23. The third transverse portion of the tubular element; 24. The fourth transverse portion of the tubular element; 25 U-shaped bend; 26 Lateral portion; 27. Force applied; 28. Critical point; 29. Preforms; 29a The lower end of the preform; 29b The middle portion of the preform; 30. Rod-shaped auxiliary tools; 100 vehicle seats; 101 Seat components; X is the longitudinal axis; Y-axis width; Z-axis (height axis).

Claims

1. A backrest element for a vehicle seat (1). Its features The backrest element (1) includes at least one frame element (2) formed from a tubular element (3) and shaped as at least a part of the backrest element (1), the outline of the frame element (2) being given by a plurality of bends (4) of the tubular element (3) and being designed such that at least one inner surface (5) is surrounded by the tubular element (3). The frame element (2) includes a belt portion (7) intended and adapted to have a belt device arranged thereon, the belt portion (7) being disposed in the upper region (1b) of the backrest element (1), wherein at the lower end (7a) of the belt portion (7), along the longitudinal axis (X), two portions (8, 9) of the tubular element (3) are substantially abutted along the height axis (Z), and The strip portion (7) is formed such that it defines a first inner surface (5a).

2. The backrest element (1) according to claim 1. Its features The backrest element (1) includes a lower region (1a) adapted and intended to provide support in the lumbar region of the occupant, and an upper region (1b) adapted and intended to provide support in the shoulder region of the occupant and / or to receive or provide a headrest.

3. The backrest element (1) according to claim 1. Its features The frame element (2) is formed from an integral tubular element (3).

4. The backrest element (1) according to claim 1. Its features A first plate-shaped element (10) is at least partially disposed in the first inner surface (5a), and the first plate-shaped element (10) is disposed on the belt portion (7) by means of material bonding.

5. The backrest element (1) according to claim 2 or 3. Its features The upper region (1b) of the backrest element (1) includes at least one frame element (2), wherein only one frame element (2) is disposed in the upper region (1b) of the backrest element (1), wherein the frame element (2) is arranged on the lower backrest element portion (11) forming the lower region (1a) of the backrest element (1).

6. The backrest element (1) according to any one of claims 1 to 3. Its features The lower region (1a) and the upper region (1b) of the backrest element (1) include at least one frame element (2), wherein only one frame element (2) is provided.

7. The backrest element (1) according to claim 6. Its features The lower portion (2a) of the frame element (2) includes two annular segments (12) spaced apart from each other along the width axis (Y), wherein each annular segment surrounds a second inner surface (5b), wherein a second plate-like element (13) is at least partially arranged in or on each of the second inner surfaces (5b), wherein the corresponding second plate-like element (13) is arranged on the corresponding annular segment (12) by means of material connection.

8. The backrest element (1) according to claim 7. Its features The corresponding annular segment (12) includes a third portion (14) of the tubular element (3) extending downward along the longitudinal axis (X) and a fourth portion (15) of the tubular element (3) extending upward along the longitudinal axis (X), the third portion (14) being connected to the fourth portion (15) via a curved fifth portion (16) of the tubular element (3), wherein in the lower portion (12a) of the annular segment (12), the third portion (14) and the fourth portion (15) are spaced apart along the height axis (Z), wherein in the upper portion (12b) of the annular segment (12), the third portion (14) and the fourth portion (15) are adjacent to each other, wherein a first transverse portion (17) of the tubular element (3) is configured to extend along the width axis (Y) between the upper portions (12b) of the two annular segments (12).

9. The backrest element (1) according to any one of claims 1 to 3. Its features At least one additional plate-shaped element (18) and / or support column (19) is disposed on the frame element (2), the additional plate-shaped element (18) or the support column (19) being disposed on the frame element (2) by means of material connection.

10. A vehicle seat (100) having a backrest element (1) according to any one of claims 1 to 9.

11. A method of manufacturing a backrest element (1) for a vehicle seat (100) according to any one of claims 1 to 9, comprising the following steps: a) Provide a tubular element (3); b) The tubular element (3) is bent multiple times by means of a first tube bending machine to produce a preform (29). c) Apply rod-shaped auxiliary tools (30); d) Bend the preform (29) around the rod-shaped auxiliary tool (30) such that the lower end (29a) of the preform (29) reaches the middle portion (29b) of the preform (29).

Images