EP2689692B1 - Seating furniture, in particular an office chair - Google Patents

Description

The invention is in the field of mechanics and especially in the field of furniture construction. It relates to a chair with a base part, a backrest and a backrest support. Such seating is often equipped with a synchronous mechanism for the synchronous adjustment of the seat and the backrest and designed such that a sitting position of a user is supported.

In particular, office chairs are manufactured for a continuous and regular use, offer an extremely high level of comfort and should support an ergonomically favorable sitting position. The backrest of such an office chair can yield under force and thus allow different seating positions or dynamically support possible seating positions and position changes. For this purpose, various principles may apply, such as, for example, from US 2008/0179930 A1 is known to attach a backrest to a base member while making it movable.

The present invention has for its object to provide a chair of the type mentioned, the backrest is individually customizable in terms of shape.

This object is achieved by the features of claim 1. Advantageous embodiments, developments and variants are the subject of the dependent claims.

For this purpose, in the chair according to the invention a backrest support with a base part facing the lower support end and facing away from the base upper support end and a preferably at least partially shell-like backrest provided a flexible backrest section and a having inflexible support portion. The inflexible support portion is via a first (lower) pivot axis to the lower support end and the flexible Backrest portion is connected via a second (upper) pivot axis to the upper support end of the backrest support, wherein the flexible back portion extends between the second (upper) pivot axis and a transition region to the inflexible support portion. By means of an adjusting mechanism of the inflexible support portion is pivotable about the first (lower) pivot axis and consequently the distance between the second (upper) pivot axis and the transition region is adjustable, so that the backrest shape of the backrest, in particular their extending in the sagittal plane curvature in the flexible backrest section, is changed. As a result, the shape of the backrest due to their flexible backrest part is particularly advantageous and in a simple manner with respect to the rigid backrest support individually adjustable or adjustable.

This principle of adjustability and adjustability of the backrest shape as well as the construction according to the invention are particularly advantageously applicable to an office chair, in which the base part has a seat support with a seat surface and a support frame with rollers.

The backrest is approximately L-shaped in side view or in a vertical longitudinal section, wherein the comparatively short, substantially horizontally extending L-leg forms the inflexible support section and the comparatively long, substantially vertically extending L-leg forms the flexible backrest section. The backrest support, which is preferably also approximately L-shaped, suitably has two carrier legs spaced apart from one another, between which the comparatively short L-legs of the inflexible support section of the backrest are arranged. In contrast, the flexible backrest section of the backrest projects beyond the backrest support on both sides in the (horizontal) transverse direction.

In a particularly advantageous embodiment, the flexible backrest section of the backrest projects beyond the second (upper) pivot axis in the (vertical) longitudinal direction. This leads to a change in the backrest shape to pivot this upper backrest section, namely to its pivoting at the back, when the arching of the flexible backrest portion extending in the sagittal plane increases as a result of pivoting of the inflexible support section and to vertical alignment as the arching decreases.

In this case, with the longitudinal direction of the backrest, the course direction of the flexible backrest section from the transition region to the inflexible support section is meant beyond the second (upper) pivot point. The sagittal plane is the plane of the chair in which the usual S-shaped curvature of the spine of a human is located, which uses the piece of furniture in the intended anatomical position in a straight, symmetrical sitting posture. In the case of a chair with armrests, the sagittal plane is that plane which forms a vertically aligned plane of symmetry of the chair between the armrests.

In a deflection of the backrest within the sagittal plane transverse to the longitudinal direction of the backrest support and the backrest, this is changed by a compression or extension of the cross-section in the sagittal plane S-shaped or multi-curved configuration of the backrest. The rotatable or pivotable mounting of the approximately L-shaped backrest to the backrest support is particularly easy to produce by a realization of the first and second pivot axis as a fixed bearing in the form of, for example, a rotary or pivot bearing.

The transition region between the comparatively short L-leg, which forms the inflexible support portion of the backrest, and the comparatively long L-leg, which forms the flexible backrest portion, to the second (upper) pivot bearing dependent on the degree of compression or curvature of the flexible backrest portion Distance up. Accordingly, if this distance is increased in the longitudinal direction of the backrest by means of the adjustment mechanism in the longitudinal direction of the backrest as a result of a pivoting of the inflexible support section (short leg of the backrest), the compression (bulging) of the flexible backrest section (long L-leg of the backrest) decreases. Conversely, the compression decreases (Buckle) of the flexible backrest section too, if this distance is reduced.

The adjusting mechanism has an adjusting element. This is coupled in an advantageous embodiment with the inflexible support portion of the backrest and in the backrest carrier in a trained as a slot guide contour in one of the support legs (carrier-side guide contour) and there in its relatively short leg of L, out. The displaceably guided in the slot-like guide contour of the backrest support adjustment is preferably a bolt or cam in turn in an elongated hole formed as a guide contour of the inflexible support portion of the backrest (reclining guide contour) guided adjustment.

In the course of manual actuation of the adjusting mechanism in the form of a rotary movement of an actuating element about a backrest-fixed (carrier-fixed) axis of rotation, the adjusting part is displaced along the carrier-side guide contour. As a result, the bolt of the adjustment part in the reclining guide contour of the inflexible seat portion of the backrest is forcibly guided such that the inflexible support portion pivots about the first (lower) pivot axis. For this purpose, the course of the reclining guide contour is steeper than the course of the carrier-side guide contour, in which the adjustment or the adjustment is performed.

The adjustment or displacement of the adjusting part and thus the bolt-like adjusting element within the carrier-fixed guide contour is carried out in an appropriate embodiment by means of a shaft on the adjustment of the adjusting shaft fixed gear meshing with rack-like locking elements of the adjustment. The adjustment axis is suitably formed by a polygonal (hexagonal) shaft or rod.

Suitably, the adjusting element of the adjusting mechanism can be fixed in a number of adjustment positions. For this purpose, the adjustment expediently has a bearing shell with spaced detent recesses.

This bearing shell lies in the recess-side guide contour formed as a slot-like recess. The provided with the detent recesses and the bolt of the adjusting receiving bearing shell has two opposing and the slot-like guide contour for the bolt between them limiting side walls.

Suitably, one of these side walls, preferably that side wall which lies opposite the latching recesses, is elastically yielding in the opening direction of the oblong hole or slot-like guide contour. Thus, this side wall can escape radially, when the bolt of the adjustment moves over the area between two locking recesses of the opposite side wall. The flexibility of the resilient side wall is expediently achieved in that this side wall is not or only partially tied or formed on a rear wall-like shell portion of the bearing shell. An elastic compliance of a side wall can be ensured on the one hand by a suitable choice of the material of the bearing shell and on the other hand by constructive measures.

Preferably, the bearing shell is provided as a separate component which is inserted into a lehenseitiges slot to form the guide contour. A frame of the bearing shell preferably has a circumferential reinforced edge which is substantially oval-shaped, and on which the two side walls are opposite one another on the longitudinal sides. In addition, the frame may have a bottom in the installed state, the rear wall of the bearing shell forming, which stabilizes the edge and the position of the side walls against each other. If, in addition, a slot in the bottom or in the rear wall is arranged parallel to one of the side walls, this side wall becomes movable and elastically more yielding than the other, opposite side wall.

Taking into account the detent recesses, the two side walls should have a spacing which is smaller than the diameter of the bolt, so that it is clamped elastically between the side walls. The bolt of the adjustment is then typically in the slot in each case in a detent recess rotatably mounted and is selectively transferred under the action of force from a detent recess in another. It is ensured by the elasticity of the side walls that the bolt is held in operation in a detent recess and can only be moved by additional adjustment effort from one detent recess to another.

In a particularly suitable embodiment of the backrest, its flexible backrest section has a central part and laterally attached side parts. The backrest may have a curved only in the sagittal plane middle part and two each also curved in only one plane and connected to the middle part side parts. In this way, both the middle part and each of the side parts can be easily produced, wherein by the interaction of central part and side parts a curved surface in several dimensions can be formed. The central part and the side parts can thus together form a curved in the transverse plane contour. In this case, the transverse plane is a plane perpendicular to the sagittal plane, which is aligned horizontally in the usual setup of the chair. Also, the middle part and the two side parts may be curved in the sagittal plane. In addition, the backrest, d. H. whose flexible backrest section may also be arched in the transversal plane, so that the backrest or its flexible backrest section is particularly advantageously adapted to the contour of the back of a user.

The side parts are connected or formed with the formation of narrow gaps on the central part via, for example, comparatively thin-walled material webs. These webs are opened over part of their (vertical) length, so that two guide contours result laterally of the middle part. In these guide contours corresponding guide elements are guided, which are connected or integrally formed on a lumbar support. The lumbar support is thus manually displaceable within the guide contours in the vertical direction.

The lumbar support may be, for example, a part-cylindrical component whose cylinder axis is perpendicular to the sagittal plane and that at the central part of the backrest or, for example in the connecting region in each case with the middle part a side part is attached. The lumbar support serves to realize a desired anatomical individual shape of the backrest, in particular in its flexible backrest region.

Fig. 1

schematisch einen Bürostuhl mit einem Lehnenträger und einer gewölbten Rückenlehne in einer Seitenansicht,

Fig. 2

den Bürostuhl in einer perspektivischen Ansicht mit Blick auf die Rückseite der Rückenlehne,

Fig. 3

in schematischer Seitenansicht die am Lehnenträger in einem oberen und einem unteren Schwenkpunkt gelagerte Rückenlehne mit zwei unterschiedlichen Wölbungen,

Fig. 4 und 5

in einer Darstellung gemäß Fig. 3 einen Verstellmechanismus im Bereich eines unflexiblen Stützbereichs der Rückenlehne mit unterschiedlichen Positionen einer trägerseitigen und einer lehnenseitigen langlochartigen Führungskontur zueinander,

Fig. 6

in Seitenansicht einen lehnenseitigen Teil des Verstellmechanismus,

Fig. 7

in Seitenansicht ein trägerseitiges Verstellteil im Eingriff mit dem lehnenseitigen Teil des Verstellmechanismus,

Fig. 8

den Verstellmechanismus in perspektivischer Ansicht mit einem mit dem Verstellteil in Eingriff befindlichem Zahnrad,

Fig. 9

in einer Darstellung gemäß Fig. 8 die trägerseitige Führung des Verstellteils in einem Trägerschenkel des Lehnenträgers,

Fig. 10

in perspektivischer Vorderansicht die im Lehnenträger gehaltene Rückenlehne mit einem aus einem Mittelteil und zwei Seitenteilen gebildeten Lehnenabschnitt inklusive Lordosenstütze,

Fig. 11

die Rückenlehne in einer Schnittdarstellung, und

Fig. 12

die Rückenlehne in einer perspektivischen Rückansicht.

Embodiments of the invention will be explained in more detail with reference to a drawing. Show:

Fig. 1

schematically an office chair with a backrest support and a curved backrest in a side view,

Fig. 2

the office chair in a perspective view overlooking the back of the backrest,

Fig. 3

in a schematic side view of the backrest mounted on the backrest support in an upper and a lower pivot point with two different curvatures,

4 and 5

in a representation according to Fig. 3 an adjustment mechanism in the region of an inflexible support region of the backrest with different positions of a carrier-side and a lean-side slot-like guide contour to one another,

Fig. 6

in side view a leaning side part of the adjusting mechanism,

Fig. 7

in side view, a carrier-side adjusting part in engagement with the reclining-side part of the adjusting mechanism,

Fig. 8

the adjusting mechanism in a perspective view with a gear located in engagement with the adjusting part,

Fig. 9

in a representation according to Fig. 8 the carrier-side guidance of the adjusting part in a carrier leg of the backrest carrier,

Fig. 10

in a perspective front view held in the backrest backrest with a backrest portion formed from a central part and two side parts including lumbar support,

Fig. 11

the backrest in a sectional view, and

Fig. 12

the backrest in a perspective rear view.

Corresponding parts are provided in all figures with the same reference numerals.

The FIGS. 1 and 2 show in side view or in a rear perspective view of an office chair 1 with a base 2 with a seat 3 and a seat support 4. The base 2 rests on a support frame 5 with a provided with rollers 6 carrying star 7. At the base part 2 is a backrest support held with two spaced, in particular at least substantially parallel to each other, Trägerschenkein 8a, 8b. The backrest support 8 is substantially L-shaped, with its comparatively short L-leg 8c extending substantially horizontally. The comparatively long L-leg 8d of the backrest support 8 extends substantially vertically and holds the leg end side, ie at the upper support end 10b, a backrest 9, while the backrest support 8a extends with the lower support end 10a below the seat surface 3 to the base part 2, to the backrest support 8 is held. The backrest 9 extends with an upper backrest portion 9a beyond the upper support end 10b of the backrest support 8.

The as well as the seat 3 covered with a pad 11 backrest 9 has a flexible backrest portion 9b and an inflexible, hereinafter referred to as a support or pivot portion backrest portion 9c, which is arranged between the comparatively short L-legs 8c of the backrest support 8. The flexible backrest section 9c has a curvature 12 directed towards the seat surface 3, specifically in the so-called sagittal plane, which in the plane of the paper Fig. 1 lies and the office chair 1 almost in a left and a right chair half shares.

How out Fig. 2 is relatively clear, the backrest 9 extends with the flexible backrest portion 9c with respect to the backrest width between two armrests 13 connected to the seat support 4 and in the vertical backrest longitudinal direction to the top of the seat 3. The office chair 1 may comprise a so-called synchronous mechanism, which allows a synchronous movement of the backrest 9 and the seat surface 3 when the backrest 9 inclines from the upright position shown to a backward inclined position.

In the region of the comparatively short L-leg 8c of the backrest support 8, a handling element or operating lever 14 can be seen, which is part of an adjustment mechanism described below. Rear side of the backrest 9 handling elements 15 can be seen, for the adjustment of a lumbar support 16 (FIG. Fig. 10 ), as will also be explained in more detail below.

The Fig. 3 to 5 show comparatively schematically the connection of the backrest 9 to the backrest support 8 with differently shaped backrest 9 and in particular different curvature or compression or extension of the flexible backrest portion 9c and the associated different tilt or pivotal position of the inflexible support portion 9c of the backrest 9. In the 4 and 5 In addition, the adjusting mechanism 20 is shown in principle.

The backrest 9 is connected via a first, lower pivot axis 17 and a second, upper pivot axis 18 to the backrest support 8. Here, the lower pivot axis 17 is in the region of the lower support end 10a of the comparatively short, the inflexible support portion 9c of the backrest 9 forming L-leg. In other words, the lower pivot axis 17 is located at the leg ends of the comparatively short L-legs of both the backrest 9 and the back support 8. The upper pivot axis 18 is analogous in the region of the upper support end 10b, ie at the leg end of the comparatively long L-. Leg of the backrest 9 and the backrest support 8. Here, the upper pivot axis 18 with respect to the backrest 9 at the upper end of the flexible backrest part 9b and there in the transition to the backrest portion 9a.

Between the comparatively long L-leg of the backrest 9, which forms its flexible backrest portion 9b, and the comparatively short L-leg 9c of the backrest 9, which forms its inflexible support portion 9c, there is a corresponding transitional area 19. This is to the second, spaced above the upper pivot axis 18, wherein this distance A means the adjustment mechanism 20 adjustable and thus the shape of the backrest 9 is variable.

Thus, by pivoting this transition region 19 in the vertical direction down the distance A 'relative to the distance A in the Fig. 3 and 4 shown starting position enlarged. Accordingly, depending on the distance A or A ', the curvature 12 of the flexible backrest portion 9b more or less compressed or stretched. Along with this different compression or extension of the backrest 9, the inclination of the upper backrest portion 9a relative to the vertical changes, this upper backrest portion 9a with increasing curvature (compression) 12 of the backrest 9 is inclined increasingly towards the vertical to the rear.

The change in the shape of the backrest 9 is effected by means of the adjusting mechanism 20, whose operation in principle from the 4 and 5 is apparent. An adjusting element 21 is guided in a carrier-side guide contour 22, which is introduced as a slot in the comparatively short L-leg 8c of the back support 8. The adjusting element 21 also interacts with a reclining guide contour 23, which is also introduced in the form of a slot in the inflexible support portion 9c of the backrest 9. The inclination angles α ₁ and α _{2 of} the reclining guide contour 23 and the carrier-side guide contour 22 are different, wherein the reclining guide contour 23steiler runs as the carrier-side guide contour 22. In other words, the two guide contours 22, 23 based on the adjusting element 21 at an angle α ₃ to each other, which corresponds to the difference between the two inclination angles α ₁ and α ₂ to the horizontal H.

The Fig. 6 to 9 show a detailed embodiment of the adjusting mechanism 20. The executed in the form of a bolt or cam adjusting element 21 of the adjusting mechanism 20 is formed on an elongate adjusting member 24 which is guided displaceably in the carrier-side guide contour 22 ( Fig. 9 ). The adjusting member 24 cooperates with a gear or pinion 25, which sits non-rotatably on a running in the embodiment as a hexagon rod or shaft 26. The Shaft 26 passes through the inflexible support portion 9c of the backrest 9 and the support leg 8a in the region of its comparatively short L-leg 8c with a shaft journal 26a, on which the actuating lever 14 is placed. The external teeth of the gear 25 clamped with corresponding teeth of a rack 27 which is impressed in the adjustment part 24.

In the course of an actuation of the adjusting mechanism 20 by means of the actuating element 14 in the form of a rotational movement, a rotation of the gear 25 takes place about the axis defined by the shaft 26, with the result that the adjusting member 24 is displaced in the carrier-side guide contour 22 in the direction of arrow 28a. As a result of the coupling of the adjusting part 24 via the adjusting element 21 with the inflexible support portion 9c of the backrest 9 on the reclining-side guide contour 23 is a pivoting movement of the transition region 19 in the direction of arrow 28b. Consequently, the shape of the backrest 9 changes, in particular by increasing its curvature 12 in the flexible backrest section 9d (compression) or reduced (extension). This is pivoted by the inflexible support portion 9c of the backrest 9 about the lower pivot axis 17. This is formed by integrally formed on the inside of the support legs 8a and 8b pin 29, in corresponding recesses 30 at the leg end of the comparatively short L-leg - and thus in the inflexible support section 9c - seat the backrest 9 so that it can rotate.

In order to keep the backrest 9 in the respectively adjusted form, the adjusting mechanism 20 is self-locking. For this purpose, an elongated bearing shell 31 is inserted into the reclining guide contour 23, the in Fig. 6 is relatively clear. The bearing shell 31 has a frame with two opposite side walls 32, 33, between which a slot or a slot opening 34 is formed as a reclining side guide contour. In this sits the bolt-like adjusting element 21 of the carrier-side adjustment part 24 a.

One of the two side walls, here the side wall 32, is provided on the inside with locking recesses 35 in which the bolt-like adjusting element 21 is clamped rests. The clamping fixation is achieved in that the locking recesses 35 opposite side wall 33 of the bearing shell 31 is formed radially elastic. For this purpose, a slot 37 is inserted between a shell rear wall 36 and the corresponding side wall 23 of the bearing shell 31. In the unloaded state, the clear width between the side walls 32 and 33 is smaller than the outer diameter of the adjusting element 21 of the adjustment 24. In the course of an adjustment or displacement of the bolt-like adjusting element 21 within the slot opening 34, the adjusting element 21 under appropriate elastic deformation of the side wall 33 in engage adjacent detent recesses 35 to be clamped there due to the force exerted by the flexible side wall 33 spring force.

This results in an elastic resilience of the frame of the bearing shell 31, which results in that held therein between the side walls 32, 33 in a locking position bolt-like adjusting element 21 is held there elastically and with respect to a shift self-locking. Only an actuation of the shaft or rod 26 changes the position of the adjusting element 21 in the bearing shell 31 and thus in the reclining guide contour 23 to a further latching recess 35 out.

In Fig. 6 is also comparatively clear that the carrier side rotatably fixed shaft or rod 26 of the adjusting mechanism 20 comparatively large openings of the inflexible support portion 9c of the backrest 9 passes through, wherein the inside width of this leaning side opening 38 is sufficiently large compared to the outer diameter of the shaft or rod 26 ,

Fig. 10 Shown is the overall shape of the backrest 9 with a central part 90 and two side parts 91, 92 and with the lumbar support 16, wherein the lumbar support 16 is arranged in the region of the flexible backrest portion 9b. The backrest 12 may for example consist of a bendable hard plastic and be at least partially covered with a padding.

Fig. 11 shows a cross section through a backrest 9 at the level of the leaning region above the lordosis support 16 in the horizontal direction, parallel to the transverse plane. It is clear that both the middle part 90 and the side parts 91, 92 of the backrest 9 are each curved in only one plane of curvature, wherein the in Fig. 8 shown arrangement of the central part 90 and the side parts 91 and 92 a total of approximated by kinking curvature of the backrest 9 in a further plane, namely the horizontal (transversal) level realized. The middle part 90 and the side parts 91, 92 are, for example, glued together, shed, welded or preferably connected to one another by material webs 41, 42, for example in the manner of film hinges, in their respective joining regions 39, 40. As a result, a total of approximately three-dimensional curvature shape of the backrest 9 results.

Fig. 12 shows in a perspective rear view of the central region of the flexible backrest portion 9b of the backrest 9 with the side parts 91, 92 and the middle part 90. The lordosis support 16, not shown, extending across a portion of the first side part 91, the entire central part 90 and a total Part of the second side part 92 extends, is by means of pin-like projections 41 ( Fig. 10 ) in guide grooves 42 ( Fig. 12 ) guided and held, which are introduced into the web-like joining areas 39, 40. LIST OF REFERENCE NUMBERS 1 office chair 24 adjusting part 2 base 25 Gear / crack 3 seat 26 Shaft / bar 4 seat support 26a Journals / Section 5 supporting frame 27 rack 6 role 28a, b arrow 7 support star 29 spigot 8th backrest support 30 recess 8a, b support legs 31 bearing shell 8c short L-thigh 32 Side wall 8d long L-thigh 33 Side wall 9 backrest 34 Slot guide 9a Upper backrest section 35 catch recess 9b flexible backrest section 36 Shell rear wall 9c inflexible support section 37 slot 10a lower end of carrier 38 opening 10b upper carrier end 39 joining area 11 pad 40 joining area 12 bulge 41 conformation 13 armrest 42 guide 14 actuating lever 15 handling element 90 midsection 16 lumbar support 91 side panel 17 lower pivot axis 92 side panel 18 upper pivot axis 19 Transition area A section 20 adjustment H horizontal 21 Adjusting / bolts α _1,2 tilt angle 22 carrier-side guide contour α ₃ angle 23 lean side guide contour

Claims (13)

1. Seating furniture (1), in particular an office chair, having a base part (2) and having a backrest support (8) which has a lower support end (10a) facing the base part (2) and an upper support end (10b) facing away from the base part (2), and having a backrest (9) having a flexible backrest section (9b) and having an inflexible support section (9c),

   - wherein the inflexible support section (9c) is attached to the lower support end (10a) via a first pivot axis (17) and the flexible backrest section (9b) is attached to the upper support end (10b) of the backrest support (8) via a second pivot axis (18),

   - wherein the flexible backrest section (9b) extends between the second (upper) support axis (18) and a transition region (19) to the inflexible support section (9c),

   - wherein, by pivoting the inflexible support section (9c) around the first (lower) pivot axis (17) using an adjustment mechanism (20) having an adjustment element (21), the spacing (A, A') between the second (upper) pivot axis (18) and the transition region (19) can be adjusted in order to change the backrest design of the backrest (9), in particular its curvature (12) extending in the sagittal plane in the region of the flexible backrest section (9b),

   characterised in that

   - the adjustment element (21) is moulded to an adjustment part (24) which is guided in a guide contour (22) of the backrest support (8), said guide contour being formed as an elongated hole, and

   - the adjustment element (21) is guided in a guide contour (23) of the inflexible support section (9c), said guide contour being formed as an elongated hole.
2. Seating furniture (1) according to claim 1,
   characterised in that
   the flexible backrest section (9b) has a central part (90) which is arched in the sagittal plane, as well as two side parts (91, 92) which are each arched in one plane and are connected to the central part (90).
3. Seating furniture (1) according to claim 2,
   characterised in that
   the central part (90) and the side parts (91, 92) together form an arched contour in the transverse plane.
4. Seating furniture (1) according to claim 2 or 3,
   characterised in that
   guide contours (42) are provided in parallel to each other between the central part (90) and the side parts (91, 92), into which guide contours a lumbar support (16) is able to be guided in a vertically adjustable manner.
5. Seating furniture (1) according to one of claims 1 to 4,
   characterised in that
   the backrest support (8) has two support legs (8a, 8b) which are spaced apart from each other, between which the inflexible support section (9c) of the backrest (9) is arranged.
6. Seating furniture (1) according to one of claims 1 to 5,
   characterised in that
   the adjustment element (21) of the adjustment mechanism (20) is coupled to the inflexible support section (9c) and is guided in the backrest support (8).
7. Seating furniture (1) according to one of claims 1 to 6,
   characterised in that
   the adjustment mechanism (20) has a shaft (26) which runs transversely to the sagittal plane and is mounted rotatably in the backrest support (8), said shaft having an actuating element (14) held thereon for the manual actuation of the adjustment mechanism (20).
8. Seating furniture (1) according to one of claims 1 to 7,
   characterised in that
   the adjustment mechanism (20) has a gear wheel (25), which is in particular non-rotational with the shaft (26), said gear wheel engaging with corresponding support-side locking elements (27), in particular a rack of the adjustment part (24).
9. Seating furniture (1) according to one of claims 1 to 8,
   characterised in that
   the adjustment element (21) of the adjustment mechanism (20) is able to be fixed in an adjustment position.
10. Seating furniture (1) according to one of claims 1 to 9,
    characterised in that
    the adjustment mechanism (20) has a bearing shell (31) allocated to the backrest support (8), said bearing shell having locking recesses (25) which are spaced apart from one another.
11. Seating furniture (1) according to claim 10,
    characterised in that
    the bearing shell (31) sits in the guide contour (23) of the inflexible support section (9c), said guide contour being formed as an elongated hole, and receives the adjustment element (21).
12. Seating furniture (1) according to claim 10 or 11,
    characterised in that
    the bearing shell (31) has two side walls (32, 33) which are opposite each other and delimit an elongated hole (34) between them, of which side walls at least one is elastically flexible in the opening direction of the elongated hole (34).
13. Seating furniture (1) according to claim 12,
    characterised in that
    the locking recesses (35) are introduced into one of the side walls (32, 33).

Images