Seating furniture with height-adjustable headrest

Description

[0001] The invention relates to a piece of seating furniture, in particular an armchair or sofa, with at least one backrest, at least one headrest, at least one headrest height adjustment and at least one headrest pivoting unit, wherein the headrest is held adjustable relative to the at least one backrest at least from a lower position to an upper position via the headrest height adjustment, wherein the headrest is held pivotably on the headrest height adjustment relative to the headrest height adjustment via the headrest pivoting unit, and wherein the at least one headrest pivoting unit is provided, when adjusting the headrest from the lower position to the upper position and / or back, at least in sections in positive engagement with at least one headrest guide and displaceable along the headrest guide in such a way thatso that an adjustment of the headrest swivel unit relative to the headrest guide is necessarily converted into a swiveling of the headrest relative to the headrest height adjustment and / or the backrest.

[0002] Seating furniture with height-adjustable headboards, also known as headrests, is available in various designs and allows the user to assume a comfortable sitting and / or lying position. Typically, this seating furniture comprises a frame and a backrest in addition to the headboard, which can be adjusted in height using a headboard height adjustment mechanism. The headboard height adjustment mechanism is integrated into the frame and / or backrest as invisibly as possible. The frame is primarily a chassis to which attachments such as side panels, at least one backrest, at least one armrest, and / or at least one seat can be mounted. The chassis itself usually stands on the surface and therefore usually includes at least one leg. Furthermore, the seating furniture is usually designed as an armchair or sofa.

[0003] To allow the user to adopt various comfortable positions on the seating, the headrests can be height-adjustable between at least one lower position and at least one upper position. For example, the user can then adjust the headrest to the lower position when lying down and to the upper position when sitting. Any intermediate positions are also conceivable.

[0004] To adjust the headrest, it can be connected to the backrest and / or the frame via height-adjustable struts. The struts are then guided along at least one guide as required to ensure comfortable adjustment of the headrest. In many cases, height adjustment alone is not sufficient to ensure that the headrest can assume a comfortable position for the user. Rather, in addition to height adjustment, the headrest must also be able to be tilted. For this reason, seating furniture is already known which, in addition to headrest height adjustment for adjusting the headrest from a lower position to an upper position, also provides a headrest pivoting unit to pivot the headrest relative to the headrest height adjustment. Corresponding seating furniture is known from JP H02 224705 A, EP 2 450 230 A1 and DE 196 49 537 A1.However, this involves a higher construction effort for the seating furniture and a higher susceptibility to failure.

[0005] Therefore, the object of the present invention is to design and develop the seating furniture mentioned at the outset and described in more detail above in such a way that the constructional effort can be reduced without having to accept any loss in terms of reliability.

[0006] This object is achieved by a piece of seating furniture according to claim 1.

[0007] The pivoting of the headboard can also be achieved with the height adjustment of the headboard. This is not only particularly easy to accomplish, but also particularly reliable. The headboard is automatically pivoted in the specified manner when the headboard is raised and / or lowered. For this purpose, the headboard pivoting unit engages with a headboard guide at least partially during the adjustment of the headboard from the lower position to the upper position and / or back. The headboard pivoting unit is thus moved along the headboard guide when the headboard height adjustment is raised or lowered. The positive engagement of the headboard pivoting unit and the headboard guide converts the height adjustment of the headboard into a pivoting of the headboard, at least partially.

[0008] It is particularly simple and reliable if the headboard swivel unit and the headboard guide remain engaged with each other throughout the entire adjustment of the headboard from the lower position to the upper position and / or back. However, this is not necessary. In principle, it would be sufficient for the corresponding engagement to be present in those sections of the headboard adjustment path in which a defined swiveling of the headboard is to be ensured. Furthermore, it is generally sufficient if only one headboard swivel unit engages with only one headboard guide. However, it can be more reliable if two headboard swivel units engage with two headboard guides, for example to prevent the headboard swivel unit or the headboard height adjustment from tilting when raising and / or lowering the headboard.The two headrest swivel units with headrest guides can conveniently be arranged on opposite sides of the seating unit and / or the backrest. Of course, more than two headrest swivel units and two headrest guides can also be provided, but this will be at the expense of the seating unit's structural complexity.

[0009] In a first particularly preferred embodiment of the seating furniture, the headrest is inclined, depending on its height position, at least in sections between the lower position and the upper position at a predetermined angle relative to the headrest height adjustment and / or the backrest. This can be achieved simply and precisely by adapting the headrest pivot unit and the headrest guide to one another in a suitable manner. For a specific height adjustment of the headrest height adjustment, the angle of the headrest is then predetermined via the headrest guide. The headrest can be inclined in different positions between the lower position and the upper position at different angles relative to the headrest height adjustment and / or the backrest. The inclination of the headrest then depends on the height at which the headrest is located.For comfort reasons, it's best to tilt the headrest further forward relative to the backrest in the upper positions than in the lower positions. In other words, when the headrest is raised, it also tilts forward relative to the backrest or the seat, even if the movements don't have to be proportional to each other.

[0010] To ensure that the headboard height can be adjusted reliably even when the headboard is handled roughly, it is advisable for the at least one headboard pivoting unit to engage at least partially in at least one recess of the at least one headboard guide when the headboard is adjusted from the lower position to the upper position and / or back. This creates a reliable positive fit that can absorb high forces and transfer them to the rest of the seating. In addition, the cam of the headboard pivoting unit can be guided at least partially along the recess when the headboard is adjusted from the lower position to the upper position and / or back. This allows a corresponding positive fit to be accompanied by corresponding guidance of the headboard. The headboard can then be pivoted very precisely relative to the headboard height adjustment and / or the backrest by the cam sliding along the recess.

[0011] To simplify adjustment of the headrest and prevent accidental damage to the seating, the recess can be designed as a channel in which the corresponding cam can then move back and forth. The channel can then expediently have sliding surfaces on both opposite sides corresponding to the cam, allowing the cam to slide, at least in sections, when adjusting the headrest from the lower position to the upper position and back again. The sliding surfaces limit the adjustment of the headrest within narrow limits, making it as comfortable as possible for the user.

[0012] The at least one headrest pivoting unit and the headrest guide can alternatively or additionally engage with each other such that, below an intermediate position, the headrest is inclined at an at least substantially constant angle relative to the headrest height adjustment and / or the backrest. When adjusting the headrest between the lower position and the intermediate position, pivoting of the headrest can thus be prevented. Consequently, no space needs to be provided for such pivoting, allowing the seating furniture to be designed in a space-saving manner.

[0013] The at least one headrest pivoting unit and the headrest guide can, however, also engage with one another in such a way that the headrest is tilted further towards the backrest and / or forward in all positions above an intermediate position than below the intermediate position. Once the intermediate position has been overcome, further raising of the headrest causes the headrest to pivot forward into a position that is comfortable for the user. If necessary, it can be specified that the further the headrest is raised, the further forward the headrest is pivoted. However, sections of the adjustment path can also be provided in which raising the headrest does not cause the headrest to pivot. This can, for example, be provided in an end section of the adjustment path.Once the headboard has reached a certain inclination, it can be raised further, if necessary, only if the user requests and initiates this.

[0014] In practice, it has been shown that the headrest can be arranged in the intermediate position when the headrest has been adjusted upwards by at least 50%, preferably at least 60%, in particular at least 70% of the adjustment range between the lower position and the upper position of the headrest. If, for example, the headrest can be raised by a total of 30 cm, the headrest can only pivot once the headrest has already been raised by 15 cm or 20 cm. The headrest can then already be arranged high enough relative to the backrest that there is space to pivot the headrest forwards towards the backrest.

[0015] To ensure that the headrest does not impair the user's comfort in the lower position, the headrest can be arranged completely below the upper edge of the backrest in the lower position. The headrest can preferably be integrated into the backrest in such a way that the headrest is not recognizable as such. The upper edge of the headrest can then either be perceived as part of the backrest, for example because the upper edge of the headrest is integrated flush with the top of the backrest or because the upper edge of the headrest is recessed into the backrest to such an extent that the headrest is not visible, at least during normal use. Alternatively or additionally, the headrest can be arranged at least partially vertically above the upper edge of the backrest in the upper position.When lifted, the headrest moves forward, at least partially over the backrest, which can lead to a comfortable position for the user.

[0016] To protect the headrest height adjustment mechanism and prevent it from being compromised, the headrest is housed in a headrest slot when in the lower position. Behind the backrest, an opening for the headrest slot is provided, through which the headrest can be at least partially inserted, allowing the user to rest their head against the headrest. To further protect the headrest height adjustment mechanism, a shelf is provided to close the opening when in the upper position, and the shelf is connected to the headrest for this purpose.

[0017] To ensure that the shelf does not impede the pivoting of the headboard, at least one strut of the headboard is guided through a recess in the shelf in such a way that the at least one strut can be adjusted in the recess when the headboard is pivoted forward and / or backward. In other words, the at least one strut of the headboard can tilt forward and backward in the recess without being hindered by this tilting movement due to the recess.

[0018] Alternatively or additionally, the at least one headboard height adjustment can have at least one gear element that meshes with a rack element of the seating furniture. In this way, a defined, yet simple and reliable height adjustment of the headboard can be ensured. The gear element can run up and down along the rack element to adjust the height of the headboard. For the sake of simplicity and to increase comfort, it is advisable if the gear element for adjusting the headboard height is motor-driven along the rack element. The height adjustment of the headboard can then be carried out without any significant effort from the user. To prevent the headboard height adjustment from tilting and blocking, it can be advisable to provide two gear elements opposite one another, each meshing with a rack element and connected to one another in a rotationally fixed manner via a synchronizing strut.The headrest height adjustment cannot then be accidentally raised and / or lowered to different extents on opposite sides of the seating furniture. It is particularly simple in design and particularly reliable in function if the synchronous strut is connected coaxially to the gear elements.

[0019] In order to avoid tilting or blocking of the headboard height adjustment, it can alternatively or additionally be provided that the at least one

[0020] The headboard height adjustment mechanism engages the rack element on the side of the rack element facing away from the gear element. This allows the gear element to be supported in one direction, and another element of the headboard height adjustment mechanism to be supported in the opposite direction. Alternatively or additionally, jamming or jamming transversely can be prevented if the two gear elements and / or two struts of the headboard are firmly connected to one another via a cross strut. This allows high forces to be absorbed and transferred to the rest of the seating furniture without, for example, damaging the synchronous strut or requiring it to be made too rigid.

[0021] If the headrest height adjustment is driven by a motor drive from at least the lower position to the upper position and back, the adjustment can be performed in a defined and reliable manner. If the motor drive is also designed to set the synchronizing rod in rotation, in particular directly, and / or to drive at least one gear element that meshes with a gear element, a structurally simple design with few individual parts can be realized.

[0022] This also applies, alternatively or additionally, if the motor drive is designed to be height-adjustable with the headboard height adjustment. This ensures satisfactory power transmission at all times. For the sake of structural simplicity, the motor drive can be attached to the synchronous strut and / or the cross strut.

[0023] Instead of a geared motor for driving the at least one gear element meshing with the rack element, if necessary via the synchronizing strut, other motor drives can also be used. In this case, a gear element meshing with a rack element can then be dispensed with if necessary. For example, linear drives, such as lifting tube drives or adjustment drives, could be used. With a linear drive, a movement block could then be adjusted up and down along the linear drive in order to adjust the height of the head section, optionally together with the head section pivot unit. For this purpose, the head section and / or the head section pivot unit would then preferably be attached to the movement block. Corresponding alternative drives can also be connected to a synchronizing strut to prevent tilting, but this does not then have to assume a drive function.In the case of linear drives, for example, it would be advisable if the opposing height-adjustable movement blocks were connected via the synchronous strut so that the movement blocks are always arranged at the same height in relation to the backrest.

[0024] To ensure that the forces acting on the seating are evenly distributed and to ensure a long service life, it may be advisable to provide a headrest swivel unit on each side of the seating. This is particularly useful for very wide headrests. If a rack element meshing with a gear element is provided on each side of the seating, tipping of the headrest is reliably prevented. If a headrest strut and / or a headrest guide are provided on each side of the seating, this can be achieved as an alternative or in support.

[0025] The invention is explained in more detail below with reference to a drawing which merely illustrates exemplary embodiments. The drawing shows Fig. 1A-leg detail of a first seating furniture according to the invention with the headboard in the upper position in perspective views, Fig. 2 the detail of the seating furniture from Fig. 1 with the headboard in the lower position in a top view, Fig. 3A-C another detail of the seating furniture from Fig. 1 in perspective views, a sectional view and a plan view, Fig. 4A-E the detail of the seating furniture from Fig. 1 with the head part in different positions when adjusting from the lower position to the upper position in similar sectional views and Fig. 5A-leg second piece of seating furniture according to the invention with the head part in the upper position in perspective views.

[0026] In the Fig. 1A-B A detail of a piece of seating furniture 1 in the area of a backrest 2 is shown in perspective views. The backrest 2 is in the Fig. 1A For the sake of clarity, it is not shown upholstered, although the seating furniture 1 is upholstered furniture, as shown in the Fig. 1B with upholstery 3 of the backrest 2. The representation of a seat and a chassis has also been omitted, since their construction is generally known and of secondary importance in this case.

[0027] Behind the backrest 2 there is a headrest 4 which can be adjusted in the Fig. 1A-B in the upper and forward-swung position. The headboard 4 is adjusted upwards and swung forwards so far that the headboard 4 with its upholstery 5 is arranged entirely above the upper edge of the backrest 2 and partially vertically above the upper edge of the backrest 2. In the illustrated embodiment, the upholstered part of the headboard 4 is supported by two struts 6 which extend through cutouts 7 in a tiered board 8. The cutouts 7 are elongated so that the headboard 4 can swing back and forth without the struts 6 being blocked by the tiered board 8. In the illustrated upper position of the headboard 4, the tiered board 8 closes the opening 9 of a headrest shaft 10 into which the headboard 4 can be inserted in order to bring it into the lower position.

[0028] The lower position of the head part 4 is in the Fig. 2 , wherein the head part 4 is arranged entirely in the headrest shaft 10 and essentially closes the opening 9 of the headrest shaft 10. In addition, the head part 4 is pivoted rearward in the lower position in order to be accommodated in the headrest shaft 10 behind the backrest 2.

[0029] To adjust the headboard 4 from the lower position to the upper position and back to the lower position, the headboard 4 is held on a headboard height adjustment 11 via a headboard pivoting unit 12, which pivots the headboard 4 from back to front and back again relative to the backrest 2 and the headboard height adjustment 11 as a result of the height adjustment of the headboard 4. During the height adjustment of the headboard 4, a cam 13 of the headboard pivoting unit 12 engages in a headboard guide 14, which in the illustrated and preferred seating furniture 1 is designed as a recess in the form of a channel 15. If the height of the headboard 4 is varied, the cam 13 of the headboard pivoting unit 12 adjusts in the headboard guide 14, which, depending on the adjustment range, is converted into pivoting of the headboard 4 forwards or backwards.Since the cam 13 is held in a form-fitting manner in the head section guide 14, the head section 4 is forced to pivot as a result of the height adjustment of the head section 4. The cam 13 is pushed forward or backward by one of the opposing sliding surfaces 16 that delimit the channel 15 of the head section guide 14, depending on the respective adjustment range of the head section 4 between the lower position and the upper position. However, the cam 13 can also be moved in sections along the channel 15 without being influenced by the channel 15 or the sliding surfaces 16, for example, if the cam 13 is arranged centrally in the channel 15 or the channel 15 extends in a straight line.

[0030] The headboard height adjustment 11 and the headboard swivel unit 12 are in the Fig. 3A-C Enlarged. The headboard height adjustment 11 comprises a motor drive 17 that drives a synchronous strut 18 to the left and right.

[0031] A drive that only moves to the right or left would also be conceivable, but not provided for. Adjustment in the corresponding opposite direction would then not be carried out via the corresponding drive. A gear element 19 is provided at both ends of the synchronous strut 18. The gear elements 19 mesh with rack elements 20 arranged on both opposite sides of the backrest 2. Depending on the direction of rotation of the synchronous strut 18, the gear elements 19 run up and down on the rack elements 20 and in doing so move the headboard height adjustment 11 up or down. To ensure that the headboard height adjustment 11, in particular the gear elements 19, do not become disengaged from the rack elements 20, the headboard height adjustment 11 positively engages behind them on the side opposite the gear elements 19.In addition, upper and lower stops 21, 22 are provided on the rack elements 20, which limit the upward and downward movement of the headrest height adjustment 11. To prevent the headrest height adjustment 11 from tilting, the two gear elements 19 assigned to the opposite sides of the backrest 2 are connected to a cross brace 23.

[0032] A headrest pivoting unit 12 is mounted on the headrest height adjustment 11 on opposite sides of the backrest 2, pivotable relative to the rotational axis of the gear elements 19, which in turn supports the headrest 4, so that pivoting of the headrest pivoting unit 12 is converted into pivoting of the headrest 4. The inclination of the headrest 4 in relation to the backrest 2 or the seating furniture 1 depends on the height at which the headrest height adjustment 11 and thus the headrest 4 is located. The cam 13 of the headrest pivoting unit 12 engages in the channel 15 of the headrest guide 14 and is moved back and forth by contact with the sliding surfaces 16 of the channel 15, so that the headrest 4 is pivoted back and forth in a corresponding manner. However, the channel 15 of the headboard guide 14 runs in a straight line over long distances, so that the inclination of the headboard 4 also remains constant in this area.This adjustment range allows the headrest 4 to be adjusted out of the headrest shaft 10 without the headrest 4 becoming wedged in the headrest shaft 10. Only when the headrest 4 has been lifted out of the opening 9 of the headrest shaft 10 does the headrest 4 pivot forward.

[0033] The height adjustment and the swiveling of the head section 4 are gradually in the Fig. 4A-E shown. In the Fig. 4A The headboard 4 is shown in the lower position. The upper edge of the headboard 4 essentially fills the opening 9 of the headrest shaft 10, and the shelf 8 is arranged in the lower area of the headrest shaft 10. Furthermore, the cam 13 of the headboard pivot unit 12 engages in a lower section of the channel 15 of the headboard guide 14.

[0034] By actuating the motor drive 17, the headboard height adjustment 11 moves slightly upwards by means of the gear elements 19 rolling on the rack elements 20, as shown in the Fig. 4B is shown. The motor drive 17 is firmly connected to the headrest height adjustment 11 and is therefore also raised. The cam 13 moves upward relative to the channel 15 of the headrest guide 14. Since the channel 15 runs linearly in this area, the corresponding adjustment of the cam 13 in this area of the channel 15 does not cause the headrest 4 to pivot relative to the backrest 2 or the seating furniture 1.

[0035] By further adjusting the headboard height adjustment 11 driven by the motor drive 17, the headboard height adjustment 11 and the headboard 4 reach the position shown in the Fig. 4C shown position. In this position, the cam 13 of the headboard pivoting unit 12 engages the upper end of the straight section of the channel 15 of the headboard guide 14. Accordingly, the inclination of the headboard 4 has changed between the positions according to Fig. 4A and 4C not changed. In the position of the Fig. 3C However, the padded part of the headrest 4 is completely moved out of the headrest shaft 10, so that the headrest 4 can now pivot forward unhindered.

[0036] This is the transition to the Fig. 4D This is the case with the position of the headboard height adjustment 11 shown, which is positioned somewhat higher than in the Fig. 3C . The cam 13 of the headrest pivoting unit 12 is pressed inwards by the outer sliding surface 16 of the channel 15 of the headrest guide 14, so that the headrest 4 pivots forward and thus passes vertically over the upper edge of the backrest 2.

[0037] The swiveling of the head section 4 forwards is not yet complete, but only when the head section 4 has reached the position shown in the Fig. 4E has reached the upper position shown. The cam of the headboard pivoting unit 12 is then moved further in the direction of the headboard height adjustment 11 by the associated sliding surface 16, so that the headboard 4 is pivoted even further forward. In this position of the headboard 4, the user can comfortably lean his head against the headboard 4.

[0038] Adjusting the head section 4 from the position shown in the Fig. 4D shown upper position into the position shown in the Fig. 4A The lower position shown is essentially the same as described above, only in the opposite direction.

[0039] In the Fig. 5A-B is an alternative piece of seating furniture 24 with a headboard 25 comprising only one strut 26 for connection to the headboard pivoting unit 27. This one strut 26 is guided through a central recess 28 in the tiered board 29, wherein the play between the tiered board 29 and the strut 26 is so large that the headboard 25 can pivot back and forth between the front position and the rear position without this pivoting being blocked by the tiered board 29. In order to prevent the headboard 25 from tipping over as a result of the at least one strut 26, the headboard height adjustment 30 has two cross struts 31, which can also run approximately parallel, as shown. One strut 26 of the headboard 25 is then firmly connected to both cross struts 31. The remaining elements of the seating furniture 24, however, are analogous to the seating furniture 1 according to the Fig. 1-4 A further discussion will therefore be omitted to avoid unnecessary repetition. List of reference symbols

[0040] 1 Seating 2 Backrest 3 Upholstery 4 Headboard 5 Upholstery 6 Strut 7 Cutouts 8 Shelf 9 Opening 10 Headrest shaft 11 Headboard height adjustment 12 Headboard swivel unit 13 Cam 14 Headboard guide 15 Channel 16 Sliding surfaces 17 Motor drive 18 Synchronous strut 19 Gear element 20 Rack element 21 Stop 22 Stop 23 Cross brace 24 Seating 25 Headboard 26 Strut 27 Headboard swivel unit 28 Cutout 29 Shelf 30 Headboard height adjustment 31 Cross braces

Claims

1. Seating furniture (1, 24), in particular an armchair or sofa, with at least one backrest (2), at least one head part (4, 25), at least one head part height adjustment (11, 30) and at least one head part pivoting unit (12, 27), wherein the head part (4, 25) is held adjustably relative to the at least one backrest (2) at least from a lower position into an upper position via the head part height adjustment (11, 30), wherein the head part (4, 25) is held pivotably relative to the head part height adjustment (11, 30) on the head part height adjustment (11, 30) via the head part pivoting unit (12, 27) and wherein the at least one head part pivoting unit (12, 27) is provided, when the head part (4, 25) is adjusted from the lower position into the upper position and / or back, at least in sections in positive engagement with at least one head part guide (14) and displaceable along the head part guide (14) in such a way that an adjustment of the head part pivoting unit (12, 27) relative to the head part guide (14) is forcibly converted into a pivoting of the head part (4, 25) relative to the head part height adjustment (11, 30) and / or the backrest (2), characterized in that an opening of a headrest duct (10) is provided behind the backrest (2) for at least partial passage of the head part (4, 25), that a tier board (8, 29) for closing the opening (9) in the upper position of the head part (4, 25) is connected to the head part (4, 25), and that at least one strut (6, 26) of the head part (4, 25) is guided through a recess in the tier board (8, 29) in such a way that the at least one strut (6, 26) can be adjusted forwards and / or backwards in the recess when the head part (4, 25) is pivoted.

2. Seating furniture according to claim 1, characterized in that the head part (4, 25), depending on its position, is inclined at least in sections between the lower position and the upper position at a predetermined angle relative to the head part height adjustment (11, 30) and / or to the backrest (2), that the head part (4, 25) is inclined, in different positions, at different angles relative to the head part height adjustment (11, 30) and / or to the backrest (2) and that, preferably, the head part (4, 25) is inclined further forwards in relation to the backrest (2) in upper positions than in the lower positions.

3. Seating furniture according to claim 1 or 2, characterized in that the at least one head part pivoting unit (12, 27) engages, when the head part (4, 25) is adjusted from the lower position into the upper position and / or back, at least partially in at least one recess of the at least one head part guide (14), and that the cam (13) of the head part pivoting unit (12,27) is guided at least in sections along the recess when the head part (4, 25) is adjusted from the lower position into the upper position and / or back in such a way that the head part (4, 25) is pivoted relative to the head part height adjustment (11, 30) and / or the backrest (2) by the cam (13) sliding against the recess.

4. Seating furniture according to claim 3, characterized in that the recess is formed as a channel (15) and that, preferably, the channel (15) has sliding surfaces (16) on both opposite sides for sliding the cam (13) when adjusting the head part (4, 25) from the lower position to the upper position and back.

5. Seating furniture according to one of claims 1 to 4, characterized in that the at least one head part pivoting unit (12, 27) and the head part guide (14) are in engagement with each other in such a way that the head part (4, 25) is inclined, below an intermediate position, at an at least substantially constant angle relative to the head part height adjustment (11,30) and / or the backrest (2) and that, preferably, the at least one head part pivoting unit (12, 27) and the head part guide (14) engage with one another in such a way that the head part (4, 25), above an intermediate position, is inclined further towards the backrest (2) and / or futher forwards in all positions than below the intermediate position.

6. Seating furniture according to one of claims 1 to 5, characterized in that the head part (4, 25) is adjusted upwards by at least 50%, preferably by at least 60%, in particular by at least 70% of the adjustment travel between the lower position and the upper position of the head part (4, 25) in the intermediate position.

7. Seating furniture according to one of claims 1 to 6, characterized in that the head part (4, 25) is arranged, in the lower position, completely below the upper edge of the backrest (2) and / or that the head part (4, 25) is arranged vertically above the upper edge of the backrest (2) at least in sections in the upper position.

8. Seating furniture according to one of claims 1 to 7, characterized in that the at least one head part height adjustment (11, 30) has at least one gear element (19) meshing with a toothed rack element (20) of the seating furniture (1, 24), that the gear element (19) for height adjustment of the head part height adjustment (11,30) is motor-driven along the toothed rack element (20) and that, preferably, two gear elements (19) are provided, opposite of one another, respectively meshing with a toothed rack element (20) and are connected to one another in a rotationally fixed manner, preferably coaxially with the gear elements (19), via a synchronization strut (18).

9. Seat according to claim 8, characterized in that the at least one head part height adjustment (11, 30) positively engages behind the toothed rack element (20) on the side of the toothed rack element (20) facing away from the gear element (19) and / or that the two gear elements (19) and / or two struts (6) of the head part (4) are firmly connected to one another via a cross strut (23).

10. Seating furniture according to one of claims 1 to 9, characterized in that the head part height adjustment (11, 30) is driven from at least the lower position to the upper position and back via a motor drive (17) and that, preferably, the motor drive (17) is configured to set the synchronization strut (18), in particular directly, in rotation and / or to drive at least one gear element meshing with a gear element (19).

11. Seating furniture according to claim 10, characterized in that the motor drive (17) is formed to be height-adjustable with the head part height adjustment (11, 30) and that, preferably, the motor drive (17) is fixed to the synchronization strut (18) and / or the cross strut (23).

12. Seating furniture according to one of claims 1 to 11, characterized in that on opposite sides of the seating furniture (1, 24), respectively a head part pivoting unit (12, 27) and / or respectively a toothed rack element (20) meshing with a gear element (19) and / or respectively a strut (6) of the head part (4) and / or respectively a head part guide (14) is provided.