EP2465386B1 - Seating - Google Patents

Description

The invention relates to a chair, in particular a chair with a free-swinging seat and a free-running backrest.

The DE 36 17 298 A1 describes a trained in the manner of a cantilever chair. The chair has an angled seat portion with a seat and a backrest formed as a common component. The corresponding chair frame for supporting this seat part has two side parts of a tubular profile, which are bent approximately Z-shaped to achieve a resilient effect. In order to avoid excessive rocking or rocking of the chair, a rod-shaped stiffening member is provided on both side parts, which connects the two end portions of the respective Z-side part with each other. In this way, excessive dimensioning of the bent pipe profiles can be avoided, which in addition to an increase in weight would also have the disadvantage of a reduced spring action.

Another measure to avoid excessive sizing of the bent pipe profiles consists in a stiffening of the pipe profiles themselves. So proposes, for example, the DE 41 35 488 A1 To introduce in the pipe profile before the bending process stiffening members, which are then deformed together with the pipe profile and contribute to the stiffening of the profile. Such a stiffening of the pipe profile counteracts as a stronger dimensioning of course, the desired spring action.

Furthermore, the DE 297 18 785 U1 a chair construction with a fixed seat and a free from the seat swinging backrest. To this end, the chair frame of square steel tube for holding the backrest contains two arched structures in the lower part of the foot and in the upper part of the backrest. Further, the DE 10 2007 052 937 A1 a swing mechanism for a chair, in which the seat is directly connected to the backrest, so that these two components can not oscillate independently.

The US 4,522,444 A shows a chair in which the seat and the backrest are integrally formed, so that these two sub-components also can not swing freely independently.

There is a need for a chair that has a seat and a backrest that can swing freely independently of each other. Also in this case too strong swinging or rocking of the individual chair parts should be avoided without the corresponding chair frame must be over-dimensioned.

The object of the present invention is therefore to provide an improved seating in which a seat and a backrest can swing freely independently.

This object is achieved by a chair with the features of claim 1. Advantageous embodiments and modifications of the invention are the subject of the dependent claims.

The chair of the invention comprises a seat, a backrest and a chair frame. The seat defines a main seat direction which extends from a rear side of the seat to a front side of the seat. The chair frame has two side parts, each having a substantially horizontally extending bottom strut; a first leg extending obliquely forward and upward from a rear end portion of the floor brace; a first attachment portion provided on an upper end portion of the first leg facing away from the bottom brace and formed to secure the seat; a second leg extending obliquely rearwardly and upwardly from a front end portion of the floor brace; and a second attachment portion provided on an upper end portion of the second leg facing away from the bottom brace and configured to secure the seat back, wherein the upper end portions of the first legs are positioned in the main seat direction in front of the upper end portions of the second legs. In addition, a variable-length coupling device is provided, which is connected on the one hand via at least a first connection point with the first legs of the two side parts and on the other hand via at least one second connection point with the second legs of the two side parts, wherein the coupling device is designed such that limits its maximum length is.

The seat and the backrest of the seat according to the invention are formed as separate components and attached separately from each other to the first and second legs of the chair frame. In this way, it is possible that the seat and the backrest can swing freely independently.

The bottom strut and the two legs of a side part together form approximately the shape of a triangle. The bending moments occur mainly in the connecting regions between the bottom strut and the first and the second leg in the chair frame. In particular, the seat may swing forward downwardly as the first leg flexes forward in the region of the rear end portion of the floor strut, and may swing the seatback rearwardly as the second leg flexes rearwardly in the region of the front end portion of the floor strut.

In order to prevent excessive rocking or rocking of the seat and the backrest, the variable-length coupling device is provided. This coupling device connects the two legs of a side part of the chair frame with each other such that the seat can not move too far away from the backrest.

Due to the coupling device may possibly be dispensed with a greater dimensioning of the chair frame, which would counteract the cantilever and would also have a higher weight of the chair result. By limiting the free-running movement of the seat or the backrest, the bending moments are also limited to the curved connections between the bottom strut and the respective leg, whereby the material of the chair frame is less stressed.

The seating direction of the chair is to be understood as referring to a normal use of the chair and a straight sitting position with respect to the seat. Therefore, the main seat direction runs from a rear side of the chair, where usually the backrest is fixed, to a front side of the chair, where the user's feet are in a straight sitting posture.

Shape, size and material of the seat and the backrest can basically be chosen arbitrarily. Also, the headquarters of the chair is independent of these variables.

The bottom strut is substantially horizontal, i. essentially parallel to a floor on which the seating stands. The bottom strut can rest directly on the ground or be spaced from the ground via foot elements and / or Fußgleitelemente.

The first leg and the second leg of the chair frame extend from the rear and the front end portion of the floor strut. The connection can be angled or preferably bent. The angle between the bottom strut and the two legs is basically freely selectable and may be selected to be different or equal to each other for the first and the second leg.

It is preferable that the two side parts of the chair frame are formed and arranged substantially symmetrically to the main seat direction. Also, the bottom struts of the side members preferably extend substantially parallel to the main seat direction, i. in this context within an angular range of about ± 15 degrees to the main seat direction. These two measures can increase the stability of the chair frame and thus of the entire chair.

The chair frame is preferably integrally formed in the region of the connections between the bottom strut and the legs due to the bending moments to be absorbed there. Incidentally, the chair frame, ie its bottom struts and legs can optionally be formed in one or more pieces.

The chair frame is preferably at least partially made of a tubular profile.

Furthermore, the chair frame is preferably made of a high-strength steel.

The upper end portions of the first legs are positioned in front of the upper end portions of the second legs. That the first legs of the chair frame intersect the second legs, so that the seat can be mounted in front of the backrest on the first attachment portion of the first leg. In this case, the first leg of the chair frame can extend transversely to the main seat direction either inside or outside the second leg of the chair frame.

Further, the upper end portions of the first legs are preferably at least partially in the seat, i. taken in the bottom of the seat.

The coupling device has at least a first connection point to the first legs of the side parts of the chair frame and at least one second connection point to the second legs of the side parts of the chair frame. That the coupling device may comprise one or more coupling strands which respectively require one or more first and second connection points with the legs of the chair frame. The numbers of the first and second connection points of the coupling device may optionally be the same or different from each other. In the case of several, i. of two or more coupling strands, these are preferably arranged or formed symmetrically to the main seat direction.

Preferably, the coupling device is designed and / or arranged such that their connection direction is substantially parallel to the main seat direction. In this embodiment, the coupling device is optimally aligned with these movements in the most common movements of the seat and the backrest and thus most effective. Alternatively, angular orientations of the coupling devices are also conceivable. In particular, in the case of two or more coupling strands of the coupling device, it is possible, at least a portion of the strands in one Arrange angle to the headquarters direction. In this case, the entirety of the coupling strands is preferably designed and arranged symmetrically with respect to the main seat direction, so that the overall result is a coupling device with an effective direction in the main seat direction.

Preferably, the coupling device is designed and / or arranged such that their connection direction is substantially horizontal. In this embodiment of the coupling device, this can be arranged very close to the seat and thus save space. This offers, for example, the possibility that the seating can be hung on a table furniture without the coupling device interferes with the hanging or the coupling device can be damaged when hanging. Alternatively, the coupling device may also be designed and / or arranged such that its connection direction extends substantially vertically or at an angle to the horizontal.

The coupling device may preferably be at least partially received in the seat, more specifically in the underside of the seat and thus protected. Alternatively, the coupling device may also be placed completely below the seat.

According to the invention, the coupling device between the first and second legs of the two side parts of the chair frame is variable in length and formed with a limited maximum length. This is to be understood as meaning all types of coupling devices which connect the first and second legs of the two side parts to one another and, starting from a relaxed rest position of the chair or chair frame (ie without loading of the seat by, for example, a person seated thereon), an enlargement allow the distance between the first and second joints on the first and second legs ("variable in length") up to a predetermined maximum distance. This is of course to apply to the intended use of the chair with the typically expected forces and weights. The invention includes coupling devices that counteract this change in distance, and also Coupling devices that allow this change in distance (up to the maximum distance).

In an advantageous embodiment of the invention, the at least one first connection point of the coupling device with the first legs of the chair frame is arranged in front of and / or above the at least one second connection point of the coupling device with the second legs of the chair frame. In this preferred positioning of the coupling device, the length limitation of the coupling device can be particularly simple to limit the movement of the seat or the backrest.

In a preferred embodiment, the coupling device has at least one elastic spring element. The at least one elastic spring element is preferably a tension spring. When using at least one elastic spring element, the limitation of the movement of the seat or the backrest can advantageously be damped or carried out against a force applied by the spring element.

Alternatively or additionally, the coupling device may comprise at least one cable, in which at least one end is provided with a stop element. While in relaxed state of rest of the chair or chair frame this rope is loosely guided between the first and second connection points, it limited by its stop element in the tensioned or extended state, the length of the coupling device and thus the distance between the first and second legs of the side panels. The at least one cable is preferably designed as a steel cable. In another embodiment, as an alternative or in addition to the at least one elastic spring element, the coupling device may have at least two rigid elements which engage with one another and are movable relative to one another. By way of example, the two rigid elements are a pin guided in a slot.

In a further embodiment of the invention, the maximum length of the coupling device (variable) is adjustable. This way, for example the possibility to adapt the seating to the expected load (eg according to the weight of a user: child - teenager - adult) without having to replace the coupling device.

In yet another embodiment, the coupling device is designed such that its minimum length is limited. Depending on the arrangement of the coupling device between the two legs of a side part of the chair frame and such a minimum length of the coupling device can restrict the movement of the seat or the backrest.

Also in this case, the minimum length of the coupling device (variable) can be adjustable.

In an advantageous embodiment of the invention, the first attachment portions of the two side parts of the chair frame are interconnected. This connection of the two side parts of the chair frame on the first mounting portions can increase the stability of the chair frame and thus the chair in an advantageous manner.

In the case of such a connection of the two first attachment portions of the first legs of the chair frame, the at least one first connection point of the coupling device can advantageously be provided in this connection region. This has the advantage that the at least one first connection point can be positioned as close as possible to the central axis of the seat in the main seat direction, with the result of a stable and central coupling of the first and second legs.

In an advantageous embodiment of the invention, the bottom struts of the two side parts of the chair frame are connected to each other via at least one crossmember. By this Traverse (s), the stability of the chair frame can be increased.

Furthermore, the first attachment portion of the side part preferably extends substantially horizontally. In this way, an attachment of the Seat on the first mounting portion of the first leg of the side part, if necessary, easier to be mounted and aligned.

In an advantageous embodiment of the invention, the first leg of the second leg of the side part in each position of the chair frame at a minimum distance of about 25 mm. This ensures that no nips are present on the seating despite its free-swinging construction. As a result, the risk of injury to users can be reduced.

Fig. 1

eine Perspektivansicht eines Sitzmöbels gemäß einem ersten Ausführungsbeispiel der Erfindung;

Fig. 2

eine Seitenansicht des Sitzmöbels von Fig. 1;

Fig. 3

eine Ansicht des Sitzmöbels von Fig. 1 von unten;

Fig. 4

eine Teilseitenansicht der Kopplungsvorrichtung des Sitzmöbels von Fig. 1 bis 3 als modifiziertes erstes Ausführungsbeispiel; und

Fig. 5

eine Seitenansicht eines Sitzmöbels gemäß einem zweiten Ausführungsbeispiel der Erfindung.

The above and other features and advantages of the present invention will become more apparent from the following description of non-limiting embodiments with reference to the accompanying drawings. In it show, partly schematically:

Fig. 1

a perspective view of a chair according to a first embodiment of the invention;

Fig. 2

a side view of the chair of Fig. 1 ;

Fig. 3

a view of the seat of Fig. 1 from underneath;

Fig. 4

a partial side view of the coupling device of the chair of Fig. 1 to 3 as a modified first embodiment; and

Fig. 5

a side view of a chair according to a second embodiment of the invention.

There will now be a first embodiment of a seat with reference to Fig. 1 to 4 described in more detail.

The chair has a seat 10 and a backrest 12 as separately formed and separately mounted components. Seat 10 and backrest 12 are made, for example, as molded parts made of a plastic material.

The seat 10 defines a main seat direction 14 which extends from a rear side of the seat to a front side. In Fig. 1 and 3 this headquarters direction 14 is located in each case at the location of the central axis of the chair in this main seat direction. The main seat direction 14 results from a normal use of the chair with a straight sitting position in which the user sits straight on the seat 10, leaning against the backrest 12 at the rear and looking forward.

The seat 10 and the backrest 12 are mounted on a chair frame. This chair frame has two side parts 16a and 16b, which are formed and arranged substantially symmetrically to the central axis of the seat in the main seat direction 14. The two side parts 16a, 16b are preferably made of a tubular profile of a high-strength steel.

The two side parts 16a, 16b each contain a bottom brace 18, which extends substantially horizontally, ie, parallel to the ground, from front to back. In this exemplary embodiment, the bottom struts 18 of the side parts 16a, 16b are aligned essentially parallel to the main seat direction 14 (cf. Fig. 3 However, they may also include an angle in the range of about ± 15 degrees with the main seat direction 14.

At the bottom struts 18 optional foot elements, sliding elements or the like can be attached. In addition, the bottom struts 18 of the two side parts 16a, 16b are preferably connected to one another via at least one cross member 20, which runs essentially transversely to the main seat direction 14 and increases the stability of the chair frame.

Each side member 16a, 16b further includes a first leg 22 extending from a rear end portion of the bottom brace 18 (right in FIG Fig. 2 and 3 ) runs diagonally forward and upwards. This first leg 22 can bend around the first connection region 24 between the bottom strut 18 and the first leg 22, so that the first leg 22 can swing freely forward.

At the bottom of the strut 18 facing away from the upper end portion of the first leg 22, a first attachment portion 26 is provided in each case. These first attachment portions 26 extend substantially horizontally and are preferably connected together by a connecting portion 28 to increase the stability of the chair frame. At the first mounting portions 26 each have a mounting plate 30 is fixed, which is connected to the underside of the seat 10, for example screwed.

Furthermore, each side part 16a, 16b has a second leg 32 extending from a front end portion of the bottom strut 18 (left in FIG Fig. 2 and 3 ) runs diagonally backwards and upwards. This second leg 32 can bend around the front connection region 34 between the bottom strut 18 and the second leg 32, so that the first leg 32 can swing freely to the rear.

At the bottom of the strut 18 facing away from the upper end portion of the second leg 32, a second attachment portion 36 is provided in each case. These second attachment portions 36 initially extend substantially horizontally inwards and then in an upward arc. At the second fixing portions 36 of the second leg 32, the backrest 12 is attached. Optionally, the second fastening portions 36 of the side parts 16a, 16b can be connected to each other in order to further increase the stability of the chair frame.

As in particular in Fig. 2 To recognize the bottom strut 18, the first leg 22 and the second leg 32 of a side part 16a, 16b approximately form the shape of a triangle. In this case, the first fastening sections 26 of the first legs 22 are positioned in the main seat direction 14 at least partially in front of the second fastening sections 36 of the second legs 32. As in particular in Fig. 1 and 3 can be seen, the forwardly extending first legs 22 are guided outside the rearward extending second legs 32 of the side parts 16a, 16b over.

The chair frame is also provided with a coupling device 38. As in Fig. 2 indicated, this coupling device 38 is connected on the one hand to the first fastening portions 26 of the first leg 22 and on the other hand to the second fastening portions 36 of the second leg 32 of the side parts 16a, 16b.

In this case, this coupling device 38 extends in this embodiment substantially horizontally between the two connection points. As in Fig. 2 shown, remains in this way a space below the seat 10 is obtained, so that the chair can be hung in an advantageous manner with a seat 10 on a table furniture.

Next is in Fig. 2 indicated that the coupling device 38 is at least partially embedded in the bottom of the seat 10, that is received in corresponding grooves. Thus, the coupling device 38 itself is better protected and the risk of injury to users and third parties is reduced.

Likewise, the upper end portions of the first legs 22 are preferably at least partially recessed in the seat 10, i. received in corresponding grooves in the bottom of the seat 10. This increases the stability of the attachment of the seat 10 to the first legs 22 of the side parts 16a, 16b.

In reference to Fig. 3 For example, in this embodiment, the coupling device 38 is composed of exactly one coupling strand that extends substantially along the center axis of the chair in the main seat direction 14.

The coupling device 38 or its coupling strand is formed variable in length. For this purpose, the coupling device 38 has a spring element 40 which is attached via a first fastening element 42 to the connecting portion 28 between the first two fastening portions 26 of the first leg 22 and a second fastening element 44 to the two second fastening portions 36 of the second leg 32 , The first connection point of the coupling device 38 with the first legs 22 of the side parts 16a, 16b is thus in the main seat direction 14 in front of the second connection point the coupling device 38 with the second legs 32 of the side parts 16a, 16b positioned.

The spring element 40 of the coupling device 38 counteracts too great a spacing between the upper end regions of the first and second legs 22, 32. The maximum distance is limited by a maximum length of the spring element 40, wherein this limitation is due to the spring force conditions upon expansion of the spring element 40 in a damped manner.

The maximum length of the coupling device 38 may, if desired, be adapted to the particular user of the chair, more specifically to his / her body weight. This can be done, for example, by selecting a spring element 40 with an adapted spring constant for the coupling device 38. In another embodiment, for example, the second fastening element 44 of the coupling device 38 can be exchanged or variably adjusted.

The coupling device 38 acts as follows. If the seat 10 in its front in the head-14 direction area (left in Fig. 2 ), so he can tip down slightly forward, since the first leg 22 of the side parts 16a, 16b can swing around the rear connecting portions 24 to the bottom struts 18 forward. However, this free swinging of the seat 10 is limited by the coupling device 38, which restricts the distance of the forwardly moving first fastening sections 26 of the first legs 22 from the second fastening sections 36 of the second legs 32 remaining in the rest position. Since thus too strong swinging or rocking of the seat forward is not possible, the possible load on the rear connecting portions 24 of the chair frame is limited, so that a weaker dimensioning of the pipe profile can be chosen or can be dispensed with additional stiffening of the pipe section.

Similarly, as a user shifts his weight rearwardly and pushes against the seat back 12, the seat back 12 will rock slightly rearward, as the second legs 32 of the side panels 16a, 16b are about the front Connecting portions 34 can swing to the bottom struts 18 to the rear. This free swinging of the backrest 12 is likewise limited by the coupling device 38, which restricts the distance between the rearward-moving second fastening sections 36 of the second legs 32 from the first fastening sections 26 of the first legs 22 remaining essentially in the rest position. Since thus too strong swinging or rocking the backrest 12 to the rear is not possible, the possible load on the front connecting portions 34 of the chair frame is limited.

In the Fig. 1 to 3 It can also be seen that the first legs 22 have a clear distance from the second legs 32 of the chair frame at each position. These distances are preferably chosen so that they produce no terminal points in any position of the chair frame, ie in particular at the maximum deflection of the seat 10 forward on the one hand and at the maximum deflection of the backrest 12 to the rear. To exclude or minimize the risk of injury, a nip-free seating is desired, which ensures at any time and at any point a minimum distance of about 25 mm between the adjacent components.

Moreover, while a limitation on the maximum length of the coupling device 38 has been described above, which is intended to limit the free swing of the seat 10 forward and the backrest 12 to the rear, it is also possible to set a minimum length of the coupling device 38. This can be achieved for example by appropriately designed spring elements 40, correspondingly configured fasteners 42, 44 or by additional elements. Also, such a minimum length of the coupling device 38 may be designed to be variably adjustable.

In the first embodiment described above, the coupling device 38 has an elastic spring element 40. Also conceivable are coupling devices 38 with two or more elastic spring elements 40, which are arranged one behind the other and / or parallel to one another.

In the first embodiment described above, the coupling device 38 has an elastic spring element 40. Additionally or alternatively, the coupling device 38 may also include two or more rigid components which are slidably engaged with each other to define a minimum and / or a maximum length of the coupling device. For this purpose, for example, a slot extending in the main seat direction 14 may be used, in which a pin is slidably guided.

A particularly preferred embodiment of the coupling device will be referred to as a modification of the above-described first embodiment Fig. 4 described in more detail. Fig. 4 shows the part of the coupling device 38 which is attached to the connecting portion 28 of the two first legs 22 of the side parts 16a, 16b.

As in Fig. 4 As shown, the coupling device 38 is attached to a fastener 42 which is mounted, for example welded, to the connecting portion 28. The coupling device 38 has, as in the first embodiment, an elastic spring element in the form of a tension spring 40. This tension spring 40 is formed at its end with a hook-shaped extension 46 which engages in a hole / opening 48 in the fastener 42. The tension spring 40 thus fixed at its ends counteracts with its spring force an increase in the distance between the fastening elements 42, 44 and limits the distance to a maximum dimension.

In this modified embodiment, a steel cable 50 is additionally provided, which is guided through the axial cavity of the tension spring 40, as in Fig. 4 indicated. This steel cable 50 is guided at the end by a further hole / opening 54 in the fastener 42. In addition, the steel cable 50 has at its end a stop sleeve 52, which is designed with respect to shape and size larger than the aperture 54 so that they can not pass through the opening 54 therethrough.

In the relaxed state of rest of the chair or the chair frame, ie without load, for example, by a person sitting on it, the steel rope 50 runs through the opening 54 in the fastening element 54 and lies loosely in the tension spring 40, so that the steel cable 50 has no effect. When the seat is loaded, the first and second legs 22, 32 of the side parts 16a, 16b of the chair frame move and the joints between the legs 22, 32 and the coupling device 38 move apart against the force of the tension spring 40. This increase in the distance or extension of the coupling device 38 is possible until the attached at the end of the steel cable 50 stop sleeve 52 abuts against the fastener 42. In this way, the elongation of the tension spring 40 and thus the maximum length of the coupling device 38 are limited.

In another embodiment (not shown), the coupling device 38 includes the steel cord 50 of FIG Fig. 4 but not the tension spring 40. The steel cable 50 also ensures the limitation of the maximum length of the coupling device 38, the counterforce in this case but solely by the chair frame, more precisely by the connections between the legs 22, 32 and the bottom struts 18 of two side parts 16a, 16b applied.

Referring to Fig. 5 Now, a second embodiment of a seat is explained in detail. The same components are identified by the same reference numerals as in the case of the first embodiment.

The second embodiment of the Fig. 5 is different from the one in Fig. 1 to 3 illustrated embodiment by the arrangement of the coupling device 38 in the chair frame.

As in Fig. 5 is indicated, the coupling device 38 extends from first connection points on the first attachment portions 26 of the first leg 22 down to second connection points on the second attachment portions 36 of the second leg 32. Here, the coupling device 38 preferably has two parallel coupling strands, which is symmetrical to the central axis in the main seat direction 14 are arranged and, for example, in the region of the crossing points of the first and second legs 22, 32 in the view of Fig. 3 are located.

In this embodiment, the first connection points of the coupling device 38 with the first legs 22 are thus above the second connection points of the coupling device 38 with the second legs 32. It is therefore preferable to have both a maximum length (for the swinging of the backrest 12) and a minimum length To specify length (for the seat 10 swing).

While the coupling strands in Fig. 5 run substantially vertically, they can also run obliquely backwards in more or less large angles.

Incidentally, the seating corresponds to Fig. 5 that of the first embodiment, including its described modifications and variations.

Claims (12)

1. A seating furniture comprising:

   a seat (10) defining a main sitting direction (14) extending from a rear side of the seat toward a front side of the seat;

   a backrest (12) at the rear side of the seat (10); and

   a chair frame having two side parts (16a, 16b) each comprising:

   - a bottom strut (18) extending substantially horizontally;

   - a first leg (22) extending at an angle forwards and upwards from a rear end section of the bottom strut (18);

   - a first fastening section (26) provided at an upper end section of the first leg (22) facing away from the bottom strut (18) and configured for mounting the seat (10);

   - a second leg (32) extending at an angle rearwards and upwards from a front end section of the bottom strut (18); and

   - a second fastening section (36) provided at an upper end section of the second leg (32) facing away from the bottom strut (18) and configured for mounting the backrest (12),
   wherein the upper end sections of the first legs (22) are positioned in front of the upper end sections of the second legs (32) in the main sitting direction (14),

   characterized in that
   the seat (10) and the backrest (12) are formed as components separate to one another and are mounted to the first or second legs (22, 32) of the chair frame separate from each other so that the seat and the backrest are allowed to swing freely and independently from one another; and
   there is provided a coupling device (38) of variable length which is on the one hand connected to the first legs (22) of the two side parts (16a, 16b) via at least one first connection site, and on the other hand to the second legs (32) of the two side parts (16a, 16b) via at least one second connection site,
   wherein the coupling device (38) is configured such that its maximum length is limited.
2. The seating furniture according to claim 1
   characterized in that
   the at least one first connection site of the coupling device (38) is disposed in front of and/or above the at least one second connection site of the coupling device (38).
3. The seating furniture according to any one of preceding claims,
   characterized in that
   the coupling device (38) comprises at least one elastic spring element (40), preferably a tension spring.
4. The seating furniture according to any one of claims 1 to 3,
   characterized in that
   the coupling device (38) comprises at least one rope (50) which has at least one end equipped with a stop element (52).
5. The seating furniture according to any one of claims 1 to 3,
   characterized in that
   the coupling device (38) comprises at least two rigid elements that are engaging each other and are movable in relation to each other.
6. The seating furniture according to any one of preceding claims,
   characterized in that
   the maximum length of the coupling device (38) is adjustable.
7. The seating furniture according to any one of preceding claims,
   characterized in that
   the coupling device (38) is configured such that its minimum length is limited.
8. The seating furniture according to any one of preceding claims,
   characterized in that
   the first fastening sections (26) of the two side parts (16a, 16b) of the chair frame are coupled to one another.
9. The seating furniture according to claim 8,
   characterized in that
   the at least one first connection site of the coupling device (38) is disposed within a connection area of the first legs (22) of the two side parts (16a, 16b) of the chair frame.
10. The seating furniture according to any one of preceding claims,
    characterized in that
    the bottom struts (18) of the two side parts (16a, 16b) of the chair frame are coupled to one another via at least one cross-member (20).
11. The seating furniture according to any one of preceding claims,
    characterized in that
    the two side parts (16a, 16b) of the chair frame are configured and arranged in an essentially symmetric manner in relation to the main sitting direction (14).
12. The seating furniture according to any one of preceding claims,
    characterized in that
    the first leg (22) has a minimum distance of about 25 mm from the second leg (32) of the side part (16a, 16b) in all positions of the side part (16a, 16b).

Images