Backrest part for seating furniture and seating furniture

Abstract

The invention relates to a backrest (6) for a piece of seating furniture (2) for supporting a user of the seating furniture (2) from the backrest side, comprising a base frame (10) and at least one headrest part (8) arranged on the base frame (10) for supporting the user from the head side, the respective headrest part (8) being held on the base frame (10) by means of a headrest adjustment device (12), the headrest adjustment device (12) is arranged on the chassis (10) and can be automatically switched back and forth between a lower height position of the headrest part (8) and an upper height position of the headrest part (8), and wherein the headrest adjustment device (12) has two guide links (14, 16) for holding the headrest part (8), each guide link being movable along a height axis of the chassis (10) and spaced apart from one another, and a lower cross member (18) which extends perpendicularly to the guide links (14, 16) and is mechanically connected to the guide links (14, 16).

Description

TECHNICAL FIELD

[0001] The invention relates to a backrest part for a seat furniture for supporting a user of the seat furniture from a backrest side, comprising a chassis and at least one headrest part arranged on the chassis for supporting the user from a head side, wherein the respective headrest part is held on the chassis by means of a headrest part adjustment device of the chassis and is automatically reciprocally shifted between a lower height position of the headrest part and an upper height position of the headrest part, and wherein the headrest adjustment device has two guide links which are respectively movable along a height axis of the chassis and mutually spaced apart and serve for holding the headrest part, and a lower crossbar which extends perpendicular to the guide links and is mechanically connected with the guide links, wherein the lower crossbar is on both end side ends of the lower crossbar respectively force-transmissively connected with a drive member of a drive of the headrest adjustment device which extends along the height axis of the chassis, the drive having an electric motor.

[0002] Furthermore, the invention also relates to a seat furniture with a backrest part of this type. BACKGROUND

[0003] The type of backrest part for a seat furniture and the seat furniture equipped with the backrest part are known in the prior art in a plurality of mutually different embodiments. The known backrest part for a seat furniture is configured for supporting a user of the seat furniture from a backrest side and comprises a chassis and at least one headrest part arranged on the chassis for supporting the user from a head side, wherein the respective headrest part is held on the chassis by means of a headrest part adjustment device of the chassis and is automatically reciprocally shifted between a lower height position of the headrest part and an upper height position of the headrest part, and wherein the headrest adjustment device has two guide links which are respectively movable along a height axis of the chassis and mutually spaced apart and serve for holding the headrest part, and a lower crossbar which extends perpendicular to the guide links and is mechanically connected with the guide links, wherein the lower crossbar is on both end side ends of the lower crossbar respectively force-transmissively connected with a drive member of a drive of the headrest adjustment device which extends along the height axis of the chassis, the drive having an electric motor. SUMMARY

[0004] The invention solves the technical problem of improving the backrest part for a seat furniture and the seat furniture.

[0005] To solve the technical problem, the invention in combination with the features of the preamble of claim 1 is characterized in that the drive has only one electric motor, wherein the electric motor is fixedly arranged on the upper crossbar of the headrest adjustment device substantially centrally between the two guide links. Furthermore, the technical problem is solved by the seat furniture having the technical features of claim 10.

[0006] A particular advantage of the present application is that the backrest and the seat furniture for the backrest are improved. In view of the construction of the backrest and the seat furniture according to the present application, a very good synchronicity of the two guide links for holding and height adjustment of the respective headrest portion of the backrest relative to the chassis of the backrest can be ensured. Accordingly, tilting of the headrest adjustment device and thus a lack of smoothness, jamming or even damage is effectively avoided during height adjustment of the aforementioned headrest portion, i.e. during its change from the lower height position to the upper height position or vice versa. The backrest with the headrest adjustment device according to the present application is thus constructed functionally reliable and long-lived. During height adjustment of the respective headrest portion, only one motor of the drive of the headrest adjustment device cannot move together as usual due to its position fixation, so that either a higher stability of the backrest according to the present application can be achieved compared to the prior art or, with a similar stability of the backrest according to the present application, an embodiment with lower material input and / or a construction space saving is achieved. The essentially central positioning of the only one motor also serves to avoid an undesirable torque input in the backrest caused by the motor in a simple manner. The aforementioned advantages apply in particular to the backrest according to the present application, with a headrest portion of large dimensions, for example with a large extension perpendicular to the chassis height axis, i.e. a very wide headrest portion. Furthermore, the aforementioned advantages can be achieved with the present application in a structurally and technologically very simple and robust manner and method.

[0007] In principle, the backrest according to the present application and the seat furniture according to the present application equipped with the backrest according to the present application can be freely selected within a wide range of applications in terms of type, functionality, material and size.

[0008] A further advantageous refinement of the backrest according to the present application provides that the motor is connected to the rest of the drive by means of at least one drive link, preferably the drive link is configured as a polygonal link, particularly preferably as a hexagonal link. In this way, on the one hand, a structurally reduced and, on the other hand, a robust embodiment of the headrest adjustment device and thus of the backrest according to the present application is achieved. This applies in particular to the preferred and particularly preferred embodiments of the refinement. It is particularly advantageous for this case that the at least one drive link is configured as the only one drive link.

[0009] A further advantageous refinement of the backrest portion according to the application provides that the remaining portion of the drive has two angle drives, wherein the angle drives are each connected in a torque-transmitting manner on the drive side to the motor and on the transmission side to the drive elements, which are each configured as a spindle, and wherein each spindle cooperates in a force-transmitting manner with a spindle nut which is adapted to the spindle and which is mechanically connected to one of the two end-side end portions of the lower crosspiece. Thereby, on the one hand, very reliable and in large numbers implemented embodiments for torque deflection by 90° are given in the transmission technology on the market. For example, angle drives configured as bevel gear drives are cited here. On the other hand, by the combination of a respective angle drive on the one side and a spindle with a respective spindle nut adapted thereto on the other side, an embodiment of the torque deflection is formed which is very simple both in terms of construction and in terms of production technology.

[0010] An advantageous refinement of the above-described refinement of the backrest portion according to the application provides that the spindles are arranged in a U-profile of the headrest adjustment device which extends along a height axis of the chassis, and the spindle nuts are guided in the adapted U-profile essentially without play perpendicular to the height axis of the chassis. In this way, on the one hand, the stability of the headrest adjustment device and thus of the backrest portion according to the application is significantly improved by means of the U-profile, while only a small increase in material and thus in weight is incurred. On the other hand, by the combination of the U-profile with the respective spindle nut, a simple but very functionally reliable and robust transverse guidance of the spindle nut along the height axis is formed during the height adjustment of the respective headrest portion.

[0011] An advantageous refinement of the backrest portion according to the application according to claim 3 or 4 provides that the spindles are arranged in a U-profile of the headrest adjustment device which extends along a height axis of the chassis, and the spindle nuts are guided in the adapted U-profile essentially without play along the height axis of the chassis. Thereby, similar to the above-described refinement, on the one hand, the stability of the headrest adjustment device and thus of the backrest portion according to the application is significantly improved by means of the U-profile, while only a small increase in material and thus in weight is incurred, and on the other hand, by the combination of the U-profile with the respective spindle nut, a simple but very functionally reliable and robust longitudinal guidance of the spindle nut along the height direction is formed during the height adjustment of the respective headrest portion.

[0012] Accordingly, an advantageous refinement of one of the last two refinements of the backrest part according to the application provides that each spindle nut is configured perpendicular to the height axis of the chassis and / or is configured with a tolerance compensation along the height axis of the chassis, preferably each spindle nut is configured biconvexly along the height axis of the chassis. In this way it is ensured that each spindle nut, despite unavoidable component tolerances and mounting tolerances, guides in the adapted U-shaped profile perpendicular to the height axis of the chassis and / or along the height axis of the chassis functionally reliable, i.e. without tilting, etc. This applies in particular to the particularly preferred embodiment of this refinement. Due to the above-mentioned biconvex design of each spindle nut, i.e. the crown shape of the spindle nut along the height axis, there is a close force transmission bearing between each spindle nut and the respective U-shaped profile, so that a gap between the spindle on one side and the spindle nut on the other side can be compensated. This also applies in particular to the reversal of the spindle nut movement direction, i.e. the movement of each headrest part from a downward height position into an upward height position and vice versa.

[0013] According to a particularly preferred refinement of the backrest part according to the application according to claim 6, each spindle nut is configured to be reversibly deformable perpendicular to and / or along the height axis of the chassis, preferably each spindle nut has slits on both sides, particularly preferably the slits extend along the height axis of the chassis. As a result, each spindle nut is particularly suitable for the present use case. This applies in particular to the preferred embodiment of this refinement, with the aid of which each spindle nut can be realized in a particularly simple manner and method in terms of construction and production technology. The particularly preferred embodiment of this refinement is particularly suitable for the present use case, since a very important compensation of the gap between each spindle and the spindle nut adapted thereto along the height axis of the chassis can be achieved in a simple and reliable manner. BRIEF DESCRIPTION OF DRAWINGS

[0014] Further advantages, features and details of the application result from the other subclaims and the following description. The features mentioned here can each be essential on their own, individually or in any combination. The drawings serve merely to illustrate the application in an exemplary manner and do not have limiting character. In the drawings:

[0015] Figure 1 An embodiment of a seat furniture according to the application is shown in perspective view, comprising two backrest parts according to the application,

[0016] Figure 2 An embodiment is shown in a similar view Figure 1 A partial view of a view shows an embodiment, which shows the chassis of two backrest parts,

[0017] Figure 3a A left-hand chassis in Figure 2 is shown in perspective view detail, comprising a headrest part in a lower height position,

[0018] Figure 3b Showing details in 3D view Figure 2 The left side of the base frame includes the headrest section at an upper height position.

[0019] Figure 3c Shown in enlarged view Figure 3a Details of the letter "A"

[0020] Figure 3d Shown in enlarged view Figure 3b Details of the letter "B"

[0021] Figure 4 The base frame is shown in a partial perspective sectional view, including... Figure 3a The left-hand angle drive and the matching spindle with spindle nut in the middle.

[0022] Figure 5a Shown in front view Figure 4 The base frame, but without the U-shaped profile and lower crossbeam.

[0023] Figure 5b Show Figure 5a The cross section "CC" in the middle, and

[0024] Figure 5c A three-dimensional diagram showing the basis Figure 5b The cross-section. Detailed Implementation

[0025] exist Figures 1 to 5c The image schematically illustrates an embodiment of a chair furniture according to the invention, which has a total of two backrests according to the invention.

[0026] The seating furniture 2 is constructed as a two-seater sofa and includes a total of two seat portions 4 (not shown) for users to sit on, and a total of two backrests 6 adapted to the two seat portions 4, the backrests being used to support the user from the backrest side. In this embodiment, each of the two backrests 6 has a headrest portion 8 for supporting the user from the head side. Referring to this... Figure 1 The two backrests 6 and the two headrests 8 are constructed identically to each other, so sometimes only one backrest 6 and its corresponding headrest 8 are shown or described below. The description accordingly applies to the backrests 6 and their headrests 8 that are not shown or described.

[0027] In this embodiment, each backrest 6 of the chair furniture 2 includes a base frame 10 and a headrest portion 8 arranged on the base frame 10 for supporting the user from the head side. Each headrest portion 8 is fixed to the base frame 10 by means of a headrest adjustment device 12, and at a lower height position (e.g., ...) Figure 1 and Figure 2(As shown on the left side of the diagram) and the upper height position of the headrest 8 (as shown in the diagram) Figure 1 and Figure 2 The graph (shown on the right) automatically switches between these two positions. For this purpose, it also refers to... Figure 3a , including according to Figure 1 and Figure 2 The headrest 8 on the left side of the backrest 6 is at a lower height position; and refer to... Figure 3b , including according to Figure 1 and Figure 2 The headrest portion 8 of the right-side backrest 6 is in the upper height position. Furthermore, the headrest adjustment device 12 has two guide rods 14 and 16, respectively movable along the height axis of the base frame 10 and spaced apart, for securing the headrest portion 8, and includes a lower crossbeam 18 extending perpendicularly to and mechanically connected to the guide rods 14 and 16. The lower crossbeam 18 is force-transmittingly connected at its two end faces to drive members 20 and 22 extending along the height axis of the base frame 10 of the drive mechanism 12, the drive having a motor 24. For this purpose, particularly refer to… Figures 3a to 3d As shown in the overall diagram.

[0028] According to the invention, the drive has only one motor 24, which is fixedly arranged on the upper crossbeam 26 of the headrest adjustment device 12 in a substantially central position between the two guide links 14, 16. For this purpose, see, for example, the following reference... Figures 2 to 3b .

[0029] The motor 24 is torque-transmittingly connected to the rest of the driver via at least one drive link 28, wherein the drive link 28 is configured as a polygonal link, i.e., a hexagonal link. With a suitable selection of the motor, the drive link can be configured as a single, unique link.

[0030] The remaining portion of the aforementioned drive includes two angle actuators 30 and 32, which are respectively connected to the motor 24 on the drive side for torque transmission and to the drive members 20 and 22, which are configured as main shafts, on the transmission side for torque transmission. Each main shaft 20 and 22 engages with a main shaft nut 34 or 36 adapted to the main shaft 20 and 22 for force transmission, and the main shaft nut is mechanically connected to one of the two end faces of the lower crossbeam 18. For this purpose, reference is made in particular to… Figure 3c and 3d From 5a to Figure 5c As shown in the overall diagram. Figure 3dExemplarily shown, the guide links 14, 16 are mechanically fixed to the lower cross member 18 on the one hand by means of the screw connections 38 and guided longitudinally by means of the spherical bearing arrangements 40 of the upper cross member 26 on the other hand. The two angle drives 30, 32 are here constructed on the one hand as far as possible from plastic parts and on the other hand as conical gear bearings. Reference is made for this purpose to Figures 5a to 5c Overall shown, wherein only the angle drive 30 is shown exemplarily.

[0031] In this embodiment, the respective spindle 20, 22 is arranged in a U-shaped profile 42, 44 of the headrest adjustment device 12 which extends along the height axis of the chassis 10, and the respective spindle nut 34, 36 is guided in the adapted U-shaped profile 42, 44 at least along the height axis of the chassis 10 substantially without play.

[0032] For this purpose, the respective spindle nut 34, 36 is toleranced on the one hand at least along the height axis of the chassis 10, wherein the respective spindle nut 34, 36 is biconvex on the one hand along the height axis of the chassis 10. Reference is made for this purpose especially to Figure 5b and Figure 5c Furthermore, the spindle nuts 34, 36 which are constructed as plastic nuts respectively are reversibly deformable perpendicularly to the height axis of the chassis 10 and along the spindle axis of the chassis, wherein the respective spindle nut 34, 36 has slits 46, 48 on both sides, i.e. the respective slit 46, 48 extends along the height axis of the chassis 10.

[0033] Furthermore, the respective spindle nut 34, 44 is adapted to the respective U-shaped profile 42, 44, so that a play between the spindle nut 34, 36 on the one hand and the adapted spindle 20, 22 on the other hand along the height axis of the chassis 10 can be compensated, so that a substantially synchronous movement of the two guide links 14, 16 is achieved when the headrest part 8 is transformed between the two height positions.

[0034] The mode of action of the seat furniture according to the application with the backrest part according to the application according to the present embodiment is explained in detail below with Figures 1 to 5c reference to

[0035] As already mentioned above, the seat furniture 2 is a two-seater sofa which comprises a total of two seat parts 4 and a total of two backrest parts 6 adapted thereto. Since the seat part-backrest part mating groups 4, 6 are constructed identically to one another, it is sufficient to explain one of the two mating groups 4, 6 in detail. The relevant description applies correspondingly to the not shown and / or not explained seat part-backrest part mating groups 4, 6. Analogous to this is the fact that only one of the two sides of the chassis 10 is described in the application.

[0036] First of all, Figure 2 The headrest adjustment device 12 shown on the left side of the figure is in the Figure 2The lower height position of the headrest portion 8 is shown on the left side of the diagram. (As shown...) Figure 3c As shown, the spindle nut 34, which is fixedly threaded to the lower crossbeam 18, is in a first terminal position at the lower end of the U-shaped profile 42. If a user (not shown) wishes to move the headrest 8 from the lower height position to the upper height position at this time, the user can, for example, activate the control of the motor 24 in a manner and method known to those skilled in the art by operating an operating element (not shown). The rotor (not shown) of the motor 24 rotates in a predetermined rotation direction according to this control, thereby rotating the drive linkage 28 coupled with the rotor torque transmission. Thus, the torque of the 90° deflection by the angle transmission 30 causes the spindle nut 34, which is force-transmitted on the spindle 20, to move from the aforementioned first terminal position to a second terminal position at the upper end of the U-shaped profile 42, which is adapted to the upper height position of the headrest 8. For this purpose, refer to... Figure 3d Similarly, this also applies to the angle actuator 32 along with the main shaft 22 and main shaft nut 36 arranged in the U-shaped profile 44. Given the construction of the two main shaft nuts 34 and 36, i.e., their substantially clearance-free guidance at least along the height axis of the base frame 10, substantially synchronous movement of the two main shaft nuts 34 and 36 along the height axis of the base frame 10 is achieved. This is because, due to their special design, the main shaft nuts 34 and 36 must first undergo reversible deformation with a predetermined force before they can actually move from the first end position to the second end position. This deformation compensates for the gaps existing on both sides of the headrest adjustment device 12, thereby allowing the two main shaft nuts 34 and 36 to move substantially synchronously from the first end position to the second end position.

[0037] Here, the lower crossbeam 18, which is fixedly threaded to the two main shaft nuts 34 and 36, is... Figures 1 to 3d In the corresponding drawing, the movement is also from bottom to top, so that the guide rods 14 and 16, which are fixedly threaded to the lower crossbeam 18, along with the headrest portion 8 fixed thereto, are longitudinally guided by the upper crossbeam 26. Figures 1 to 3d The movement is upwards in each drawing. For this purpose, special reference should be made. Figure 3b and Figure 3b .

[0038] If the user wishes to change the headrest 8 from the upper height position to the lower height position, this is accomplished in a manner and method similar to that previously described for changing from the lower height position to the upper height position. The corresponding control of the motor 24 can be achieved, for example, by reoperating the operating element. However, alternatively, it is also conceivable to provide different operating elements for this direction of change and for the other direction of change. Furthermore, other operating methods known to those skilled in the art for this type of seating furniture can also be applied in principle.

[0039] It is apparent that some embodiments of the application are also possible in which the transformation of the headrest part from the lower height position to the upper height position and vice versa from the upper height position to the lower height position is possible both in stages and also steplessly by means of intermediate positions. Here, the intermediate positions are respectively positioned at different height positions between the lower height position and the upper height position of the headrest part 8. Accordingly, the user can bring the respective headrest part 8 not only into the two extreme positions, but also into at least one desired intermediate position in which the respective headrest part 8 is then held for supporting the head of the user. The holding of the headrest part 8 in the lower height position and in the upper height position and, if present, in the at least one intermediate position is here accomplished only by means of the mechanical construction described above. Here, the activation of the respective positions can be accomplished, for example, by means of the operation of this operating element a number of times corresponding to the respective position, by means of mutually different operating elements or by means of other operating solutions suitable therefor.

[0040] In view of the construction of the backrest part 6 and the seat furniture 2 according to the application, a very good synchronicity of the two guide links 14, 16 for holding and height adjustment of the headrest part 8 of the backrest part 6 relative to the chassis 10 of the backrest part 6 can be ensured. Accordingly, during the height adjustment of the headrest part 8 described above, i.e. during its transformation from the lower height position to the upper height position or vice versa from the upper height position to the lower height position, tilting of the headrest adjustment device 12 and thus jerkiness, jamming or even damage are effectively avoided. The backrest part 6 with the headrest adjustment device 12 according to the application is thus constructed functionally reliable and with a long service life. During the height adjustment of the respective headrest part 8, only one motor 24 of the drive of the headrest adjustment device 12 is not possible, due to its position fixation, to move jointly as is usual, so that either a higher stability of the backrest part 6 can be achieved compared to the prior art or, with a similar stability of the backrest part 6, an embodiment with lower material input and / or a construction space saving is achieved. The essentially central positioning of the only one motor 24 also serves to avoid an undesirable moment input in the backrest part 6 caused by this motor 24 in a simple manner. The advantages described above apply in particular to the backrest part 6 with a headrest part 8 of large dimensions, for example with a large extension perpendicular to the chassis 10 height axis, i.e. a very wide headrest part 8. Furthermore, the advantages described above can be achieved by means of the backrest part 6 in a structurally and technologically extremely simple and robust manner and method.

[0041] The application is not limited to the embodiments described above. Reference is made, for example, to the relevant description in the preamble and to the alternative and optional features in the detailed description.

[0042] List of reference signs

[0043] 2 seat furniture

[0044] 4 seat part

[0045] 6 backrest part

[0046] 8 headrest part

[0047] 10 base frame

[0048] 12 headrest adjustment device

[0049] 14 guide link

[0050] 16 guide link

[0051] 18 lower cross member

[0052] 20 drive (spindle)

[0053] 22 drive (spindle)

[0054] 24 motor

[0055] 26 upper cross member

[0056] 28 drive link

[0057] 30 angle drive

[0058] 32 angle drive

[0059] 34 spindle nut

[0060] 36 spindle nut

[0061] 38 screw connection

[0062] 40 spherical bearing arrangement

[0063] 42 U-profile

[0064] 44 U-profile

[0065] 46 slot

[0066] 48 slot

Claims

1. Backrest part (6) for a seat furniture (2) for supporting a user of the seat furniture (2) from a backrest side, comprising a chassis (10) and at least one headrest part (8) arranged on the chassis (10) for supporting a head of the user from a head side, wherein The respective headrest part (8) is held on the chassis (10) by means of a headrest adjustment device (12) and can be automatically reciprocally shifted between a lower height position of the headrest part (8) and an upper height position of the headrest part (8), and wherein the headrest adjustment device (12) has two guide links (14, 16) for holding the headrest part (8), which are movable along a height axis of the chassis (10) and are spaced apart from one another, and has a lower crossbar (18) which extends transversely to the guide links (14, 16) and is mechanically connected to the guide links (14, 16), wherein the lower crossbar (18) is force-transmissively connected on both end sides of the lower crossbar (18) to drive elements (20, 22) of a drive of the headrest adjustment device (12) which extend along the height axis of the chassis (10), the drive having an electric motor (24), characterized in that the drive has only one single electric motor (24), wherein the electric motor (24) is fixedly arranged on a upper crossbar (26) of the headrest part adjustment device (12) substantially centrally between the two guide links (14, 16).

2. Backrest portion (6) according to claim 1, characterized in that The electric motor (24) is torque-transmissively connected to the rest of the drive by means of at least one drive link (28), preferably the drive link (28) is configured as a polygonal link, particularly preferably the polygonal link is configured as a hexagonal link.

3. Backrest portion (6) according to claim 1 or 2, characterized in that The rest of the drive has two angle drives (30, 32), wherein the angle drives (30, 32) are torque-transmissively connected on the drive side to the electric motor (24) and on the transmission side to the drive elements (20, 22) which are configured as main shafts, and wherein each main shaft (20, 22) cooperates force-transmissively with a main shaft nut (34, 36) which is adapted to the main shaft (20, 22) and which is mechanically connected to one of the two end sides of the lower crossbar (18).

4. The backrest portion of claim 3, wherein Each main shaft is arranged in a U-shaped profile which extends along the height axis of the chassis of the headrest adjustment device, and each main shaft nut is guided substantially without play in the adapted U-shaped profile perpendicular to the height axis of the chassis.

5. Backrest portion (6) according to claim 3 or 4, characterized in that Each main shaft (20, 22) is arranged in a U-shaped profile (42, 44) which extends along the height axis of the chassis (10) of the headrest adjustment device (12), and each main shaft nut (34, 36) is guided substantially without play in the adapted U-shaped profile (42, 44) along the height axis of the chassis (10).

6. Backrest portion (6) according to claim 4 or 5, characterized in that Each main shaft nut (34, 36) is configured tolerance-compensatingly perpendicular to the height axis of the chassis and / or along the height axis of the chassis (10), preferably each main shaft nut (34, 36) is configured bi-conically along the height axis of the chassis (10).

7. The device (6) according to claim 6, characterized in that Each main shaft nut (34, 36) is configured reversibly deformable perpendicular to and / or along the height axis of the chassis (10), preferably each main shaft nut (34, 36) has slits (46, 48) on both sides, particularly preferably the slits (46, 48) extend along the height axis of the chassis (10).

8. Backrest portion (6) according to any one of claims 3 to 7, characterized in that The respective spindle nut (34, 44) is configured in cooperation with the respective U-shaped profile (42, 44) such that a gap between the spindle nut (34, 36) on the one hand and the respective spindle (20, 22) on the other hand can be compensated along the height axis of the chassis (10) such that a substantially simultaneous movement of the two guide links (14, 16) is achieved when the headrest (8) is transformed between the two height positions of the headrest (8).

9. Backrest portion (6) according to any one of claims 3 to 8, characterized in that The respective angle drive (30, 32) and / or the respective spindle nut (34, 36) is at least partially, preferably completely, composed of plastic.

10. A seating furniture (2) comprising at least one seat portion (4) for a user of the seating furniture (2) to sit on and at least one backrest portion (6) assigned to the at least one seat portion (4) for supporting the user from a backrest side, wherein At least one backrest (6) has at least one headrest (8) for supporting a user's head from the head side, characterized in that the backrest (6) is configured according to any one of claims 1 to 9.

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