backrest of a vehicle seat and a method for its assembly

Abstract

Backrest (104) of a vehicle seat (100), comprising at least one backrest frame (200) with a frame top (202) and a frame bottom (206) and two lateral frame sides (208) connecting the frame top (202) and the frame bottom (206) to each other, and a support structure (106) forming a rear wall of the backrest (104) and detachably connectable to the backrest frame (200), wherein the support structure (106) comprises at least one support element (110), characterized in that the support element (110) comprises at least one support bottom (114), one support top (112) and two lateral support sides (116), wherein the support element (110) - at least one positioning element (120), in particular a pre-positioning element (122), arranged on the upper surface (112) of the carrier, with at least one opening (124) for receiving a headrest bracket (300) and - at least one arranged on at least the underside of the support (114) and / or one of the lateral sides of the support (116) Locking element (140, 150, 160) are designed, wherein the supporting structure (106) can be aligned on the top of the frame (202) by means of the positioning element (120) and positioned relative to the backrest frame (200) and can then be detachably connected to the bottom of the frame (206) and / or the lateral sides of the frame (208) by means of the locking element (140, 150, 160).

Description

[0001] The invention relates to a backrest for a vehicle seat and a method for assembling such a backrest for a vehicle seat. State of the art

[0002] Supporting structures, such as support plates or so-called back plates, for backrests are known from the state of the art. The respective support structure is attached to a backrest frame using screw connections, rivet connections, and / or material connections such as welding, gluing, or soldering.

[0003] From DE 10 2018 208 693 A1 a support module for a headrest that can be connected to a backrest is known.

[0004] From US 10 081 282 B2 a seat back assembly with an inner support module and a seat back frame assembly is known.

[0005] From US 5 286 325 A a method for producing a vehicle seat by using cohesive adhesion of different material layers of the vehicle seat is known. Task

[0006] The invention is based on the object of improving a backrest of the type mentioned at the outset, in particular to design it with reduced weight, reduced parts and easy to assemble, and to provide a simplified method for assembling the backrest. Solution

[0007] The first-mentioned object is achieved by a backrest having the features of claim 1. The second-mentioned object is achieved by a method having the features of claim 10.

[0008] The support structure for the backrest of the vehicle seat comprises at least one support element. At least one positioning element, in particular a pre-positioning element, arranged on a support upper side, with at least one opening for receiving a headrest mount, and at least one locking element arranged on at least one support underside and / or a lateral support side, are formed on the support element.

[0009] By forming at least one positioning element, in particular a pre-positioning element, arranged on a support upper side, with at least one opening for receiving a headrest holder, and at least one locking element arranged on at least one support underside and / or a lateral support side, the weight of the backrest can be reduced compared to backrests known from the prior art. The positioning element and the locking element eliminate the need for separate connecting elements, such as screws. The positioning element, in particular a pre-positioning element, makes it easier to align the support structure relative to a backrest frame of the backrest.

[0010] Advantageous embodiments, which can be used individually or in combination with one another, are the subject of the subclaims.

[0011] The positioning element can protrude vertically from a plane defined by the support element. Because the positioning element protrudes vertically from the support element, in particular from the support's upper side, the positioning element can be easily aligned relative to the upper side of the backrest frame.

[0012] Because the locking element protrudes vertically from the support element, in particular from the underside and / or side of the support, the locking element can be easily aligned relative to a top side of the backrest frame.

[0013] The positioning element can be disc-shaped and / or block-like. The disc shape allows the positioning element to be lightweight and / or space-saving. A block-like shape allows the positioning element to additionally reinforce the upper side of the frame. The positioning element can be disc-shaped in some areas and block-like in some areas. When assembled with the backrest frame, the positioning element can rest on and / or against the upper side of the backrest frame to save space. When assembled with the backrest frame, the positioning element can reinforce the backrest frame, for example, by additionally stiffening it, to support a headrest holder and headrest. The positioning element, in particular the pre-positioning element, can form a reinforcing element for holding and supporting a headrest holder, for example a sliding sleeve.

[0014] The positioning element can be integrally formed on the support element. The locking element can be integrally formed on the support element. The support element can have at least one recess that forms the positioning element and / or the locking element. The positioning element and / or locking element can be integrally formed with the support element. The positioning element and / or locking element can be embedded in the support element. Alternatively, the positioning element and / or locking element are connected to the support element in a materially bonded, non-positively bonded, and / or positively bonded manner.

[0015] The positioning element can have an upper support surface and a lower support surface. The upper support surface can be designed, for example, as a support surface for a headrest mount and / or headrest. The lower support surface allows the positioning element to rest flatly on the upper side of the backrest frame.

[0016] The locking element can be designed as a locking hook, locking lug, or locking recess, for example in the form of a groove or a channel. Using the locking element, the support element can be easily connected to the backrest frame in a form-fitting and / or force-fitting manner. For example, the locking element can be clamped, clipped, wedged, hooked, or plugged together with the backrest frame and / or a backrest frame structure and / or a counter-locking element.

[0017] At least one corresponding counter-locking element can be provided on the backrest frame and / or on the backrest frame structure. The counter-locking element can be designed as a recess, channel, groove, lug, hook, or loop. The counter-locking element can also be present as a contour in the backrest frame. Additional separate fastening elements such as screws, rivets, soldered structures, or welded structures can be omitted. This can reduce effort and assembly time. Optionally, additional fastening elements can be used to connect the supporting structure to the backrest frame.

[0018] The support element can be made of plastic. For example, the support element can be made of expanded polypropylene (EPP for short). For example, the support element can be made of a sustainable plastic. The support element can be an injection-molded part. The support element can be reinforced in certain areas with metal inserts. The support element can have a base plate, for example, made of metal. For example, the edge or perimeter of the support element can be made of plastic.

[0019] The positioning element can be formed integrally with the support element. The support element and the positioning element can be manufactured in a single process step. For example, the support element and positioning element can be injection-molded parts. For example, the positioning element can be formed integrally with at least the support top side. Optionally, the positioning element can be attached to the support element, in particular to the support top side, in a material-to-material, force-to-fit, and / or form-fitting manner. The positioning element can be made of plastic, for example, a so-called EPP material. The positioning element can have damping properties. The positioning element can be formed to be substantially rigid and have reinforcing properties.

[0020] The locking element can be formed integrally with the carrier element. The carrier element and the locking element can be manufactured in a single process step. For example, the carrier element and the locking element can be injection-molded parts. For example, the locking element can be formed integrally with at least the underside of the carrier and / or one of the lateral sides of the carrier. Optionally, the locking element can be fastened to the carrier element, in particular to the top side of the carrier, in a material-to-material, force-to-fit, and / or form-fitting manner. The locking element can be made of plastic, for example a so-called EPP material. The locking element can have damping properties. The locking element can, for example, be designed to be reversibly flexible.

[0021] In all of the described embodiments, the support element can be formed in multiple parts or in one piece. For example, the support element with positioning element and locking element can be formed as an injection-molded part and / or from plastic. For example, the support element can have a base plate to which a support top side, a support bottom side, and two lateral support sides connecting the support top side to the support bottom side are fastened at the edges or perimeter with a pre-assembled positioning element and locking element. The support top side, support bottom side, and the support sides can, for example, form a support frame formed in one piece or assembled from multiple parts.

[0022] The positioning element can extend in the direction of a backrest frame, for example, provided at the front. The positioning element can therefore protrude perpendicularly from the support element in the direction of the backrest frame provided at the front. The positioning element can be designed as a positioning arm or positioning leg.

[0023] The positioning element can be designed as a pre-positioning element which is pre-positioned for assembly on the backrest frame in such a way that subsequent final assembly of the support element on the backrest frame can be simplified.

[0024] The positioning element can be designed in the form of a pocket, loop, and / or a housing and can accommodate the headrest structure partially or completely. The positioning element can have at least one receiving structure in which the headrest structure can be received in a form-fitting and / or force-fitting manner. For example, the receiving structure can be formed in the at least one opening of the positioning element. The receiving structure can be, for example, a clamping structure, a locking structure, and / or a wedge structure. The receiving structure can, for example, have a number of elevations, knobs, lugs, and / or ribs projecting into the openings.

[0025] The positioning element can be arranged in a central region of the support top. The positioning element can have two openings for each receiving a sliding sleeve of the headrest mount. The positioning element can extend across the entire width of the support top. The positioning element can be formed as the support top.

[0026] The support element can form a rear side of the backrest frame. The support element can have two positioning elements. Each positioning element can have an opening.

[0027] The support element can have multiple locking elements. The locking elements can be distributed, for example, along the edge or circumference of the support element. The support element can have at least one locking element on a corner side. The corner-side locking element can form a corner reinforcement or corner cover of the backrest frame. At least one locking element can form a locking groove or locking channel into which an edge and / or frame part of the backrest frame can be inserted, for example, inserted, clipped, and / or clamped.

[0028] The object is further achieved according to the invention by a backrest for a vehicle seat, comprising at least one backrest frame and a support structure, wherein the support structure comprises at least one support element, wherein at least one positioning element arranged on a support upper side, in particular a pre-positioning element, with at least one opening for receiving a headrest holder, and at least one locking element arranged on at least one support underside and / or a lateral support side is formed on the support element, wherein in an assembled state of the backrest frame and the support structure the positioning element rests on a frame upper side and the locking element is in locking engagement with at least one frame underside and / or lateral frame side.

[0029] The upper side of the frame can comprise at least one sliding sleeve for receiving a rod end of the headrest holder, wherein the positioning element can be plugged onto the sliding sleeve and positioned, in particular pre-positioned, relative to the backrest frame.

[0030] The positioning element can protrude vertically from a plane defined by the support element. Because the positioning element protrudes vertically from the support element, in particular from the support's upper side, the positioning element can be easily aligned relative to the upper side of the backrest frame.

[0031] Because the locking element protrudes vertically from the support element, in particular from the underside and / or side of the support, the locking element can be easily aligned relative to a top side of the backrest frame.

[0032] The positioning element can be placed and / or clipped onto the top of the frame for pre-positioning and / or pre-fixing. The support element can then be easily connected to the underside of the frame and / or the lateral side of the frame, either detachably or permanently. For example, a blind assembly can be performed after the positioning element has been pre-positioned and / or pre-fixed to the backrest frame.

[0033] The positioning element can be disc-shaped and / or block-like. The disc shape allows the positioning element to be lightweight and / or space-saving. A block-like shape allows the positioning element to additionally reinforce the upper side of the frame. The positioning element can be disc-shaped in some areas and block-like in some areas. When assembled with the backrest frame, the positioning element can rest on and / or against the upper side of the backrest frame to save space. When assembled with the backrest frame, the positioning element can reinforce the backrest frame, for example, by additionally stiffening it, to support the headrest bracket and headrest. The positioning element, in particular the pre-positioning element, can form a reinforcing element for holding and supporting a headrest bracket, for example a sliding sleeve.

[0034] The positioning element can have an upper support surface and a lower support surface. The upper support surface can be designed, for example, as a support surface for a headrest mount and / or headrest. The lower support surface allows the positioning element to rest flatly on the upper side of the backrest frame.

[0035] The locking element can be designed as a locking hook, locking lug, or locking recess, for example in the form of a groove or a channel. Using the locking element, the support element can be easily connected to the backrest frame in a form-fitting and / or force-fitting manner. For example, the locking element can be clamped, clipped, wedged, hooked, or plugged together with the backrest frame and / or a backrest frame structure and / or a counter-locking element.

[0036] The top side of the frame can have at least one counter-locking element. The bottom side of the frame can have at least one counter-locking element.

[0037] At least one frame side can have at least one counter-locking element. The locking element of the support element can be easily inserted, clipped, and / or clamped into the counter-locking element, or vice versa. The counter-locking element can be designed as a recess, channel, groove, lug, hook, or loop. The counter-locking element can also be present as a contour in the backrest frame. Additional separate fastening elements, such as screws, rivets, soldered structures, or welded structures, can be omitted. This can reduce effort and assembly time. Optionally, additional fastening elements can be used to connect the support structure to the backrest frame.

[0038] The number of locking elements can vary depending on customer requirements or the design of the backrest and / or backrest frame. The number of counter-locking elements can vary depending on customer requirements or the design of the backrest and / or backrest frame.

[0039] The object is also achieved according to the invention by a method for assembling a backrest as described above, wherein in a first step the positioning element of the support element is aligned on and / or on the upper side of the backrest frame until the opening of the positioning element is arranged opposite a through-opening and / or sliding sleeve provided in the upper side of the frame for a headrest holder, in a second step the positioning element is placed on the upper side of the backrest frame and / or is plugged onto the sliding sleeve, and in a third step the support element is pivoted relative to the backrest frame until the locking element comes into locking engagement with the backrest frame.

[0040] After pre-positioning and / or pre-fixing the positioning element on the top side of the frame, the support element can be pivoted and / or pressed relative to the backrest frame until the locking element fully engages a counter-locking structure, in particular a counter-locking element. In other words: After the positioning element has been pre-positioned on the backrest frame, the support element can be folded downward toward the backrest frame until the locking element engages at least the underside of the frame and / or one or both lateral sides of the frame.

[0041] In summary, and in other words, the invention provides a backrest that can be easily and quickly assembled, in which the support element, for example, an EPP back panel, is hooked onto the backrest frame and clipped to it. The opening or openings of the support element, in particular the positioning element, are positioned via sliding sleeves of the headrest mount, with the at least one locking element of the support element being clipped to the backrest frame from behind. Figures and embodiments of the invention

[0042] The invention is explained in more detail below with reference to advantageous embodiments illustrated in the figures. However, the invention is not limited to these embodiments. They show: Fig. 1: a side view of a vehicle seat, Fig. 2: an exploded view of a backrest according to the invention according to an embodiment, Fig. 3: a perspective view of the backrest according to the invention in an assembled state according to the embodiment, Fig. 4: a block diagram of a method for assembling a backrest according to the invention according to an embodiment.

[0043] The Fig. A vehicle seat 100 schematically illustrated in Figure 1 is described below using three spatial directions running perpendicular to one another. A longitudinal direction x, when a vehicle seat 100 is installed in the vehicle, runs largely horizontally and preferably parallel to a vehicle longitudinal direction that corresponds to the vehicle's usual direction of travel. A transverse direction y, running perpendicular to the longitudinal direction x, is also oriented horizontally in the vehicle and runs parallel to a vehicle transverse direction. A vertical direction z runs perpendicular to the longitudinal direction x and perpendicular to the transverse direction y. When a vehicle seat 100 is installed in the vehicle, the vertical direction z runs parallel to the vehicle's vertical axis.

[0044] The position and direction specifications used, such as front, rear, top, bottom, and transverse, refer to a viewing direction of an occupant sitting on a seat part 102 of the vehicle seat 100 in a usual sitting position, wherein the vehicle seat 100 is installed in the vehicle in a position of use suitable for passenger transport and with an upright backrest 104, and is oriented in the direction of travel as usual. However, the vehicle seat 100 can also be installed in a different orientation, for example, transversely to the direction of travel. Unless otherwise described, the vehicle seat 100 is constructed mirror-symmetrically to a plane running perpendicular to the transverse direction y.

[0045] The vehicle seat 100 may be a rear seat and / or a rear bench seat.

[0046] Fig. 2 and Fig. 3 show a backrest 104 according to the invention according to an embodiment, in which the backrest 104 is shown free of upholstery elements and / or cover elements.

[0047] The backrest 104 comprises a support structure 106 and a backrest frame 200. The support structure 106 forms a rear wall of the backrest 104. The support structure 106 is connected to the backrest frame 200 to form a backrest structure. After assembly, the backrest structure can be provided with a cushion and a cover.

[0048] Fig. 2 shows an exploded view of the backrest 104 according to the invention in an unassembled state.

[0049] The support structure 106 comprises a support element 110, on which a positioning element 120, in particular a pre-positioning element 122, is arranged on a support top side 112 and has two openings 124 for receiving a headrest holder 300. The positioning element 120 protrudes perpendicularly from a plane defined by the support element 110.

[0050] The positioning element 120 is block-shaped. Alternatively, the positioning element 120 can be disc-shaped. The positioning element 120 has an upper support surface 126. The upper support surface 126 can serve to support a headrest body, for example, in a lowered position. Furthermore, the positioning element 120 has a lower support surface 128. The lower support surface 128 is supported in the assembled state, as shown in Fig. 3, with the backrest frame 200 on a frame top 202.

[0051] Fig. 3 shows a perspective view of the backrest 104 according to the invention in an assembled state.

[0052] The frame top 202 comprises two sliding sleeves 204, in particular rod sleeves, for receiving rod ends of the headrest holder 300 (not shown in detail). The sliding sleeves 204 extend through the frame top 202. Alternatively, the sliding sleeves 204 can be flush with an upper and / or lower side surface of the frame top 202. For example, the sliding sleeves 204 can only protrude upwards or downwards on the frame top 202. To pre-position the support element 110 on the backrest frame 200, the positioning element 120 is aligned relative to the frame top 202 so that the sliding sleeves 204 can be inserted into the openings 124 of the positioning element 120, in particular the pre-positioning element 122. When the sliding sleeves 204 are inserted into the openings 124, the lower support surface 128 of the positioning element 120 can be placed flat on the frame top 202.Alternatively, for example, with downwardly projecting sliding sleeves 204, the positioning element 120 can be brought from below to the frame top 202 and aligned such that the sliding sleeves 204 can be inserted into the openings 124. Once the sliding sleeves 204 are inserted into the openings 124, the upper support surface 126 of the positioning element 120 can be placed flat against the lower side surface of the frame top 202.

[0053] The positioning element 120 is pre-positioned for assembly by placing the support surface 128 on and / or on the frame top 202.

[0054] In the illustrated embodiment, the positioning element 120 for pre-positioning and pre-fixing the carrier element 110 is plugged onto the sliding sleeves 204 from above in the insertion direction R1. The sliding sleeves 204 are guided completely through the openings 124.

[0055] The support element 110 comprises a support bottom 114 and two lateral support sides 116. The support sides 116 connect the support bottom 114 to the support top 112.

[0056] The support element 110 can be formed, for example, from a so-called EPP material. The support element 110 comprises a support body 130. The support body 130 is a flat support plate. The support body 130 comprises a support structure 132, for example in the form of support ribs. Alternatively, the support element 110 can be frame-shaped and formed from the support top side 112, the support bottom side 114, and two lateral support sides 116 connecting the support top side 112 and the support bottom side 114.

[0057] Furthermore, a plurality of locking elements 140 are formed on the carrier element 110, in particular on its carrier body 130. The number of locking elements 140 can vary. In the illustrated embodiment, two locking elements 140 are shown. Alternatively, fewer or more locking elements 140 can be provided and / or at other locations on the carrier element 110.

[0058] The carrier underside 114 comprises first locking elements 140. The first locking elements 140 are designed as locking hooks 142 or have locking hooks 142. The first locking elements 140 protrude perpendicularly from the plane defined by the carrier element 110. The first locking elements 140 are essentially I-shaped or J-shaped. The locking hooks 142 are directed upwards and have a locking recess 144 into which a frame underside 206 can be inserted, as shown in Fig. 3. The locking recess 144 is formed between the locking hook 142 and the carrier body 130. The locking elements 140 are arranged spaced apart from one another in the transverse direction. Alternatively or optionally additionally, the carrier underside 114 and / or the lateral carrier sides 116 can have a number of locking elements 140 designed as locking hooks 142.

[0059] In a modification of the first embodiment, the locking elements 140 can be formed in one piece and form a continuous locking recess 144 in the form of a channel or a groove along the transverse extent of the support underside 114. Alternatively, the first locking elements 140 can be U-shaped, with one leg being fastened to the support element 110, in particular to the support body 130, the other leg serving as a hook for holding the backrest frame 200, and a web connecting the legs forming the locking recess 144 for positively receiving the backrest frame 200.

[0060] The first locking elements 140 are flexible. The locking elements 140 can be made of plastic. The locking elements 140 can be spring-loaded.

[0061] To simplify the insertion and locking of the frame underside 206 in the locking recess 144, the first locking elements 140, in particular the locking hooks 142, have inclined edges 146, for example in the form of ramps. When the support element 110 is pre-positioned and pre-fixed to the backrest frame 200 via the positioning element 120, the support element 110 can be moved, for example folded and pivoted, in the pushing direction R2 such that the frame underside 206 moves over the inclined edges 146 and pushes the corresponding locking elements 140, in particular the locking hooks 142, away against their spring force F1 and / or clamping force until the frame underside 206 is arranged, in particular clamped, in the locking recesses 144. The first locking elements 140 are in locking engagement with the backrest frame 200 in the mounted, i.e., assembled, state. The frame bottom 206 is clamped or clipped between the locking elements 140 and the carrier body 130.

[0062] Alternatively, additionally or optionally, the support element 110 has lateral second locking elements 150. For example, the second locking elements 150 can be designed as lateral locking wings 152 and / or locking legs and / or locking arms. The second locking elements 150 can be arranged on the outer circumference of the support body 130 and form support wings or support legs, reinforcing wings or reinforcing legs for the backrest frame 200. The second locking elements 150 can, for example, have an inwardly directed spring force F2 and / or tension force towards the center of the support body, which, when the support element 110 is assembled with the backrest frame 200, acts on lateral frame sides 208 of the backrest frame 200. In the assembled state, the second locking elements 150 rest flatly on the lateral frame sides 208. The second locking elements 150 can be flexible.The second locking elements 150 may have oblique edges, for example in the form of ramps.

[0063] Alternatively, additionally or optionally, the support element 110 can have at least one third locking element 160 in a transition region, in particular corner region, between the support side 116 and the support top side 112 and / or the support bottom side 114, which in the assembled state acts with its spring force F3 on a transition region or corner region of the backrest frame 200.

[0064] In a modification of the first exemplary embodiment, a plurality of locking elements 140, 150, 160 can be formed on the carrier element 110, in particular on its carrier body 130. The number and / or position of the locking elements 140, 150, 160 can vary. For example, the carrier top side 112 can have fourth locking elements (not shown in detail) spaced from the positioning element 120. The fourth locking elements can form locking recesses into which one of the sliding sleeves 204 can be inserted or inserted, for example, for a locking engagement.

[0065] In a modification of the first exemplary embodiment, the backrest frame 200 can have counter-locking elements (not shown in detail). For example, the counter-locking elements can be designed as recesses, hooks, channels, grooves, lugs, or loops. The counter-locking elements can be distributed on the backrest frame 200 such that a position of the counter-locking elements corresponds to the position of the locking elements 140, 150, 160. The counter-locking elements can be arranged, for example, as elevations and / or protrusions and / or integral formations and / or channels on the frame parts (frame top side 202, frame bottom side 206, lateral frame sides 208).

[0066] In a further modification of the illustrated embodiment, the support element 110 can have inner locking elements 140, 150, 160 which engage with an inner peripheral surface of the backrest frame 200.

[0067] Fig.4 shows a block diagram of a method for assembling a backrest 104 according to the invention according to one of the embodiments.

[0068] In a first step V1, the positioning element 120 of the support element 110 is aligned with and / or on the upper frame side 202 of the backrest frame 200 until the openings 124 of the positioning element 120 are arranged opposite through-openings and / or sliding sleeves 204 provided in the upper frame side 202. In a second step V2, the positioning element 120 is placed on the upper frame side 202 of the backrest frame 200 and / or plugged onto the sliding sleeves 204. After the second step V2, the support element 110 is pre-positioned and / or pre-fixed to the backrest frame 200 by means of the positioning element 120. In a third step V3, the support element 110 is pivoted relative to the backrest frame 200 until the locking elements 140, 150, 160 come into locking engagement with the backrest frame 200.

[0069] The support element 110 is fastened to the backrest frame 200 in particular without tools. List of reference symbols 100 vehicle seats 102 Seat part 104 Backrest 106 Supporting structure 110 support element 112 Carrier top 114 Underside of the carrier 116 Carrier side 120 positioning element 122 Pre-positioning element 124 Opening 126 contact surface 128 contact surface 130 carrier bodies 132 Support structure 140, 150, 160 locking element 142 locking hooks 144 Recess 146 edge 152 locking wings 200 backrest frames 202 frame top 204 sliding sleeve 206 frame bottom 208 frame side 300 headrest mount F1 to F3 spring force R1 plug direction R2 push direction V1 to V3 step x longitudinal direction y transverse direction z Vertical direction

Claims

[1] Backrest (104) of a vehicle seat (100), comprising at least one backrest frame (200) with a frame upper side (202) and a frame lower side (206) and two lateral frame sides (208) which connect the frame upper side (202) and the frame lower side (206) to one another, and a support structure (106) which forms a rear wall of the backrest (104) and which is detachably connectable to the backrest frame (200), wherein the support structure (106) comprises at least one support element (110), characterized by that the carrier element (110) comprises at least one carrier bottom side (114), one carrier top side (112) and two lateral carrier sides (116), wherein on the carrier element (110) - at least one positioning element (120), in particular pre-positioning element (122), arranged on the carrier upper side (112), with at least one opening (124) for receiving a headrest holder (300) and - at least one arranged on at least the carrier underside (114) and / or one of the lateral carrier sides (116) locking element (140, 150, 160) are formed, wherein the support structure (106) can be aligned by means of the positioning element (120) on the frame upper side (202) and positioned relative to the backrest frame (200) and can then be releasably connected to the frame underside (206) and / or the lateral frame sides (208) with the backrest frame (200) by means of the locking element (140, 150, 160). [2] Backrest (104) according to claim 1, characterized by that the positioning element (120) and the locking element (140, 150, 160) protrude vertically from a plane defined by the carrier element (110). [3] Backrest (104) according to claim 1 or 2, characterized by that the positioning element (120) is disc-shaped and / or block-shaped. [4] Backrest (104) according to one of claims 1 to 3, characterized bythat the positioning element (120) has an upper support surface (126) and a lower support surface (128). [5] Backrest (104) according to one of claims 1 to 4, characterized by that the locking element (140, 150, 160) has a locking hook (142), a locking lug and / or a locking recess (144). [6] Backrest (104) according to one of claims 1 to 5, characterized by that at least the carrier element (110) is made of plastic. [7] Backrest (104) according to one of claims 1 to 6, characterized by that the positioning element (120) and / or the locking element (140, 150, 160) are / is formed in one piece with the carrier element (110). [8] Backrest (104) according to one of claims 1 to 7, wherein in an assembled state of the backrest frame (200) and the support structure (106), the positioning element (120) rests and / or abuts on and / or against the frame upper side (202) and the locking element (140, 150, 160) is in locking engagement with at least the frame lower side (206) and / or one of the lateral frame sides (208). [9] Backrest (104) according to claim 8, characterized by in that the frame upper side (202) comprises at least one sliding sleeve (204) for receiving a rod end of the headrest holder (300), wherein the positioning element (120) can be aligned relative to the backrest frame (200) by means of its opening (124) and can then be plugged or pushed onto the sliding sleeve (204) and can be positioned or positioned, in particular pre-positioned or pre-positioned, on this relative to the backrest frame (200). [10] Method for assembling a backrest (104) according to one of claims 1 to 9, characterized by , that - in a first step (V1), the positioning element (120) of the support element (110) is aligned on and / or on the upper side (202) of the backrest frame (200) until the opening (124) of the positioning element (120) is arranged opposite a through-opening and / or sliding sleeve (204) provided in the upper side (202) of the frame for a headrest holder (300), - in a second step (V2), the positioning element (120) is placed on the upper side (202) of the backrest frame (200) and / or is placed on the sliding sleeve (204), and - in a third step (V3) the support element (110) is pivoted relative to the backrest frame (200) until the locking element (140, 150, 160) comes into locking engagement with the frame underside (206) and / or one of the lateral frame sides (208) of the backrest frame (200).

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