AT525218B1 - CHAIR - Google Patents

Abstract

Chair (1) comprising a support structure (2) and a seat element (3) carried by the support structure, wherein the support structure comprises a support cross (7) having two legs (6) and a beam element (4), which each have an edge region (5a ) of a first section (5) can be arranged on a base, the beam element being connected to the seat element. So that the sitting position can be adjusted particularly easily, the invention provides that the two legs of the cross support are connected to a delimiting element (10) in a second section (18) opposite the first section, whereby a receiving opening delimited by the delimiting element and the two legs is formed (8) through which the beam element is passed and slidably supported therein to enable relative positioning of the beam element with respect to the support cross, and in that the support structure further comprises an adjustable locking element (9) for at least two different relative positions between Adjust and fix beam element and support cross.

Description

Description

CHAIR

FIELD OF THE INVENTION

The invention relates to a chair comprising a support structure and a seat element carried by the support structure,

wherein the support structure comprises a support cross having two legs and a bar element, which support cross and which bar element can each be arranged with an edge region of a first section on a base, the bar element being connected to the seat element.

STATE OF THE ART

[0002] Generic chairs comprising a support structure and a seat element carried by the support structure are known in principle.

A chair is a piece of seating furniture designed in many variants, mostly for one person, which is usually composed of a support structure and a seat element, the seat element comprising a seat and optionally a backrest. In order to ensure a particularly secure stand of the chair with a simple structure at the same time, it is advantageous if the support structure comprises crossing (leg) elements.

For example, US 4705250 A shows a support structure with crossing elements for a table or a seating element that can be quickly and easily assembled in a number of geometric configurations. EP 0442 832 A1 also shows a support structure with elements crossing one another for a seat element, the support structure being simple and rigid and having three feet.

A disadvantage of the known from the prior art, simply constructed chairs is that the sitting position can not be adjusted individually. Neither a seat inclination can be adjusted nor the seat height can be adjusted. However, this is essential, especially when sitting for a longer period of time, since every person has a different sitting posture and a different feeling of sitting comfort.

OBJECT OF THE INVENTION

It is therefore an object of the present invention to provide a chair that overcomes the disadvantages of the prior art, wherein the seat position, in particular a seat inclination, should be particularly easy to adjust. Furthermore, the chair should be economical to manufacture and flexible in use.

PRESENTATION OF THE INVENTION

[0007] This object is achieved with a chair comprising a support structure and a seat element carried by the support structure,

wherein the support structure comprises a support cross having two legs and a bar element, which support cross and which bar element can each be arranged with an edge region of a first section on a base, the bar element being connected to the seat element, solved according to the invention in that

the two legs of the support cross are connected to a delimiting element in a second section opposite the first section, as a result of which a receiving opening delimited by the delimiting element and the two legs is formed, through which receiving opening the beam element is guided and slidably mounted in this receiving opening in order to achieve a relative to allow positioning of the beam element with respect to the support cross, and that

the support structure further comprises an adjustable locking element, which locking

tion element acts on the support cross and the beam element in order to set and fix at least two different relative positions between the beam element and the support cross.

Under a chair is understood in the context of this invention, a piece of seating furniture with or without a backrest for one or more people.

It is conceivable that the support structure or at least parts of the support structure is made of wood and / or made of a metallic material.

The two legs of the supporting cross are connected to the delimiting element in the second section, as a result of which the receiving opening is formed. The beam element is arranged in sections within this receiving opening and is slidably mounted therein. By means of this arrangement, a relative positioning between the beam element and the supporting cross can be easily made possible. An angle between the beam element and the support cross is changed depending on the different positioning of the beam element in relation to the support cross. As a result, a seat surface inclination of the seat element connected to the beam element can be adjusted.

It is conceivable that with a correspondingly small angle between the beam element and the supporting cross in an operating state in which the chair according to the invention is arranged on the ground, the seat is inclined forwards, i.e. a front seating area of the seat is inclined towards the ground . As the angle increases, the seat is first aligned essentially horizontally, i.e. essentially parallel to the ground, while as the angle increases, the seat is inclined backwards, i.e. the front seating area of the seat is inclined away from the ground.

For example, when the seat is tilted forward, the pelvis of a person sitting on the chair according to the invention is tilted forward, which has a positive effect on the straightening of the spine. Furthermore, this increases the opening angle of the body, which allows the blood to circulate better.

In contrast, when the seat is tilted backwards, a “more relaxed” position can result for the person sitting on the chair according to the invention.

In order to be able to set and fix at least two different relative positions between the beam element and the supporting cross and, as a result, the corresponding angle between the beam element and the supporting cross, the support structure of the chair according to the invention includes the locking element, which engages both the beam element and the supporting cross.

It is conceivable that the locking element is connected to the beam element and/or to the supporting cross, preferably to the first section of the beam element and/or to the supporting cross, or to the beam element and/or to the supporting cross, preferably to the first section of the beam element and/or the support cross. Of course, other arrangement and connection options are not excluded.

The locking element or individual elements thereof can

- Made of a metallic material such as an aluminum alloy or steel, for example C45 or 16MnCr5, or stainless steel, for example 1.4301, or

- made of a plastic, for example a thermoplastic material, e.g. polyoxymethylene, or an elastomer or a duromer, e.g. rubber,

be made.

[0017] A large number of possible configurations are conceivable for the locking element. For example, the locking element can comprise a locking shaft plate and/or a lockable tension damper and/or a stepping motor with a coarse thread. It is also conceivable that the locking element comprises a tension spring in order to dampen the chair according to the invention in the operating state. For example, the tension spring can be a contact spring. On the one hand, a locking element comprising a toothed rack and a locking element and, on the other hand, a locking element comprising an unlocking bolt and a guide element has proven to be particularly advantageous. It is therefore provided in one embodiment of the invention that the locking element is a toothed

has a rod and a locking element,

wherein the rack is connected to the beam member or to the spider and the latch member is connected to the spider or to the beam member, the rack being engageable with the latch to adjust and fix the relative position.

Preferably, the toothed rack is connected to the first portion of the beam element or to the first portion of the support cross and the latching element is preferably connected to the first portion of the support cross or to the first portion of the beam element.

Each tooth gap, ie the distance between two adjacent teeth of the rack, forms a locking position. That is, when the latching element engages in a specific latching position, a specific relative position of the at least two different relative positions between the beam element and the supporting cross is set and fixed.

In this embodiment, the locking element is very precise and can allow numerous relative positions to be set between the beam element and the supporting cross, since a large number of teeth can be provided on the toothed rack, which teeth can be brought into engagement with the locking element. Furthermore, the locking element is particularly durable with the appropriate choice of material. For example, the rack and/or locking element can be made of steel or plastic.

It is conceivable that the rack and locking element form a telescopic adjustment fitting.

In a further embodiment of the invention it is provided that the locking element comprises an unlocking bolt,

wherein the limiting element has a through-opening, through which through-opening the unlocking bolt can be guided and engaged with the beam element.

The unlocking bolt can be arranged in sections within the through-opening of the limiting element and can be held by means of the through-opening. That is, with a corresponding arrangement, the unlocking bolt can be pushed through the through-opening, as a result of which it is in engagement with the bar element.

It is conceivable that the beam element has at least two bores, which bores are preferably arranged in the second section of the beam element and into which bores the unlocking bolt can be inserted in order to fix the beam element with respect to the support cross. Depending on which hole the unlocking bolt is inserted into, a certain relative position of the at least two different relative positions between the beam element and the cross support is set and fixed.

In any case, the locking element is structurally very simple in this embodiment, which is why it is particularly economical to produce.

In order to ensure a particularly stable connection of the two legs of the support cross, it is provided in a further embodiment of the invention that the two legs of the support cross are connected to one another by means of a blade connection, in particular by means of an overlap.

[0026] A leaf connection is, for example, a joint, a miter or an overlay.

[0027] To connect the two legs, a lap, which is a form-fitting connection, is preferably used, since with such a connection the crossing legs do not slip against one another, particularly under load. When overlapping, both parts, ie both legs, are usually machined down to about half their thickness at the connection point. The remaining material of both legs lies on top of each other in the area of the connection point.

It is alternatively or additionally conceivable that the two legs in the Ver

binding point are at least partially covered with a plate. Preferably a plate is arranged on either side of the joint - i.e. on that side of the joint which faces a base and on that side which faces the seat element.

In a further embodiment variant of the invention it is provided that the beam element comprises two struts at least in sections,

and that

the support structure comprises a projection, which projection is directed from the delimiting element into the receiving opening, the projection being arranged at least in sections between the two struts in order to stabilize the beam element.

The projection is therefore essentially perpendicular - i.e. rotated by 90° with respect to a longitudinal extent of the delimiting element - from the delimiting element into the receiving opening. Preferably, the projection extends to the junction of the two legs.

By means of the at least sectional arrangement of the projection, the beam element is stabilized with respect to the support cross, if necessary despite the load, with regard to strong fluctuations and thus ensures a safe and stable arrangement of the support structure.

The seat height - i.e. the distance between the ground and the seat surface of the seat element - also has a not inconsiderable influence on a good sitting position, which is why a further embodiment of the invention provides that the seat element can be displaced in the longitudinal direction of the beam element on the Beam element is mounted, whereby the seat height can be adjusted easily and quickly. Thus, the chair according to the invention is suitable for people regardless of their height.

Preferably, the seat element is displaceably mounted in an area of the beam element, which area is located above the support structure when the chair is in operation.

In order to prevent the seat element from being pushed off the bar element, it is provided in a further embodiment variant of the invention that the bar element has a stop element arranged in the second section, in particular in an edge region of the second section, in order to prevent the seat element from being displaced limit. This refinement can be implemented in a structurally simple and economical manner.

In a further embodiment variant of the invention it is provided that the seat element has a seat arranged on at least one support element,

wherein the seat is slidably mounted on the beam member by means of the at least one support member.

This variant embodiment can be a stool, i.e. a chair without a backrest according to the invention.

[0037] The at least one support element enables the seat element to be supported securely and in a balanced manner. Furthermore, this configuration enables the seat element to be moved easily without the seat being subjected to undue stress.

In order to enable an exact and defined setting of different seat heights, it is provided in a further embodiment of the invention that the at least one support element can be brought into engagement with the beam element. I.e. in this embodiment variant there is a positive connection between the at least one support element and the beam element.

It is conceivable that the bar element has at least two, preferably several grooves, in which grooves the support element engages, whereby a specific seat height is determined or fixed. In particular, the engagement between the support element and the beam element can be released by "tilting" the support element together with the seat - i.e. tilting in the direction of the second section of the beam element. The support element including the seat can then be moved along the bar element until it engages in a groove of the bar element that is adjacent to the “first” groove, as a result of which a different seat height is fixed.

In a further embodiment of the invention it is provided that the seat element comprises at least one support element, which is at least one support element movably connected to the at least one support element and can be arranged in such a way as to support the support element on the beam element. I.e. the at least one support element serves to further stabilize the support element with respect to the beam element and is arranged below the seat. It is conceivable that the at least one support element is connected to the at least one support element with an edge region.

Due to the movable connection between the support element and the support element, the support element can be folded in relation to the support element - i.e. towards the seat - or folded away - i.e. towards the beam element - whereby the seat height can be reduced. In particular, a minimum seat height can be achieved by folding, which in the chair according to the invention can be in a range from 40 cm to 30 cm, preferably in a range from 38 cm to 32 cm, particularly preferably in a range from 36 cm to 34 cm become.

In a further embodiment variant of the invention it is provided that the seat element has two support elements,

wherein the beam element can be clamped between the two support elements. I.e. in this variant the two support elements clamp the beam element - it is therefore a matter of a non-positive connection. The advantages of such a connection lie in the low-cost production and the simple and "continuous" adjustability.

So in order to prevent the mobility of the beam element, it is conceivable that the two support elements are connected to one another by means of a screw connection or lever connection. The force of the screw connection or the lever connection braces the two support elements with the beam element and thereby fixes the beam element - i.e. the clamping effect takes place via the screw connection or the lever connection.

For example, a screw of the screw connection is tightened, as a result of which the beam element is clamped between the two support elements. I.e. the two support elements generate a surface pressure.

In order to increase the quality of the seat, it is provided in a further embodiment of the invention that the seat element has at least one backrest connected to the at least one support element or to the seat. The backrest is therefore part of the seat element and can serve as a support for a person's head and/or back and/or arms. I.e. the backrest can support the spine and/or the arms and/or the head of a person and thus correspondingly relieve body parts of this person when sitting.

In this embodiment variant, the backrest can be fixedly or movably connected to the seat.

In order to limit and support the backrest, it is provided in a further embodiment of the invention that the backrest comprises a support element arranged along a longitudinal direction of the backrest

and that

the at least two struts each have at least two, preferably several, through-openings, the through-openings in the at least two struts being arranged in pairs with one another, so that a bolt can be passed through, on which bolt the carrier element can be supported.

The carrier element serves on the one hand as a reinforcement for the backrest - i.e. the backrest can be subjected to higher loads in this embodiment variant - and on the other hand as a stop/support element on the bolt.

[0049] The at least two through-openings of the at least two struts are preferably arranged in the second section of the beam element.

[0050] Depending on which of the at least two passage openings of each strut,

which passage openings are aligned in pairs with one another, the bolt is passed through, the seat element can be lowered accordingly.

In order to ensure a simple and economical production of the chair according to the invention, it is provided in a further embodiment of the invention that the seat and the at least one backrest are designed in one piece. This means that there are no connecting elements between the seat and the backrest.

BRIEF DESCRIPTION OF THE FIGURES

The invention will now be explained in more detail using exemplary embodiments. The drawings are exemplary and are intended to explain the idea of the invention, but in no way restrict or even conclusively reproduce it.

It shows:

1 is a schematic right side view of a first embodiment of a chair according to the invention;

2 is a schematic front view of the first embodiment of the chair according to the invention;

3 is a schematic axonometric view of a second variant embodiment of the chair according to the invention, with the support element unfolded;

[0057] FIG. 4 shows a schematic side view from the right of the second variant embodiment of the chair according to the invention with the support element folded out;

[0058] FIG. 5 shows a schematic side view from the right of the second embodiment variant of three chairs according to the invention, each with the support element folded out and different seat surface inclinations;

6 is a schematic axonometric view of the second variant embodiment of the chair according to the invention, with the support element folded;

7 is a schematic side view from the right of the second variant embodiment of the chair according to the invention with the support element folded in;

8 is a schematic axonometric view of the second embodiment variant of the chair according to the invention, with the support element unfolded and with the backrest folded;

9 is a schematic rear view of the second variant embodiment of the chair according to the invention, with the support element folded out and the backrest folded in;

10 is a schematic side view from the right of the second embodiment variant of the chair according to the invention with the support element folded out and the backrest folded in.

WAYS TO CARRY OUT THE INVENTION

Fig. 1 shows a right side view of a first embodiment of a chair 1 according to the invention, while Fig. 2 shows the corresponding front view of this embodiment, the chair 1 according to the invention having a support structure 2 and a seat element 3 carried by this.

The support structure 2, which is made of wood in this embodiment variant, comprises a support cross 7 having two legs 6 and a beam element 4, which can each be arranged with an edge region 5a of a first section 5 on a substrate. In the first embodiment variant, the two legs 6 are connected to one another by overlapping and, in addition—to increase stability—are covered on both sides with a plate in the area of the overlapping.

In a section 18 of the supporting cross 7 opposite the first section 5, the two legs 6 are connected to one another by means of a delimiting element 10, as a result of which a receiving opening 8 is formed, which is delimited by the delimiting element 10 and by the two legs 6. The beam element 4 is passed through this receiving opening 8 and is mounted in a displaceable manner. That is, the beam element 4 can be slid within the receiving opening 8 in order to enable relative positioning of the beam element 4 with respect to the support cross 7. An angle between these two elements is changed depending on the different positioning of the beam element 4 relative to the support cross 7 , as a result of which a seat surface inclination of the seat element 3 connected to the beam element 4 can be adjusted.

In the first embodiment variant, the seat element 3 comprises a seat 3a and a backrest 3b, the seat 3a being arranged on two support elements 12. FIG. The two support elements 12 are slidably mounted on the beam element 4, whereby a seat height can be adjusted easily and quickly. In order to fix the appropriately set seat height, the bar element 4 can be clamped between the two support elements 12 by means of a screw connection. The force of the screw connection braces the two support elements 12 with the beam element 4, as a result of which a surface pressure of the support elements 12 on the beam element 4 is generated.

In this embodiment variant, the seat 3a and the backrest 3b are movable, i.e. adjustable, connected to one another by means of a screw connection. In addition, the backrest 3b in this variant includes an adjustable head part.

The support structure 2 also has a locking element 9 that engages both on the beam element 4 and on the support cross 7, which in the first embodiment variant comprises an unlocking bolt 9c, by means of which different relative positions between the beam element 4 and the support cross 7 can be adjusted and fixed . For this purpose, the limiting element 10 has a through-opening through which the unlocking bolt 9c can be passed and brought into engagement with the bar element 4 . For this purpose, the bar element 4 has several holes (not shown) into which the unlocking bolt 9c can be inserted after it has been passed through the through-opening of the limiting element 10 in order to fix the bar element 4 with respect to the support element 7 .

FIG. 3 shows an axonometric view of a second embodiment of the chair 1 according to the invention with the support element 14 unfolded, while FIG. 4 shows a side view from the right of this embodiment. Although the second embodiment essentially corresponds to the first embodiment, it differs from the first embodiment in the following way:

In the second embodiment variant, the locking element 9 has a toothed rack 9a and a latching element 9b, with the toothed rack 9a being connected to the first section 5 of the beam element 4 and the latching element 9b being connected to the first section 5 of the support cross 7. Both the toothed rack 9a and the latching element 9b are made of steel in the second embodiment variant. In order to set and fix the relative position between the beam element 4 and the support cross 7 in this embodiment variant, the latching element 9b must be brought into engagement with the toothed rack 9a.

The beam element 4 comprises two struts 11 and the support structure 2 has a projection 10a which is directed into the receiving opening 8 and which is arranged between the two struts 11 . The projection 10a thus protrudes into the receiving opening 8 and, in this embodiment variant, extends from the delimiting element 10 to the area of the U overlap. The projection 10a serves to stabilize the support structure 2.

- The seat element 3 further comprises a support element 14, which between the two support element 12 on that side of the seat 3a away from the backrest 3b

has, is arranged and movably connected to the two support elements 12 . The support element 14 is foldable and can either be folded in the direction of the seat 3a or folded out in the direction of the beam element 4 . In the unfolded state, the support element 14 stabilizes the support elements 12 or the seat 3a with respect to the beam element 4. For this purpose, the support element 14 has two protruding pins, which each rest on a strut 11 of the beam element 4 when the support element 12 is in the unfolded state. In the folded state, the seat height of the chair 1 according to the invention is reduced, since the seat element 3 can be lowered until the support elements 12 rest directly on the support cross 7 , in particular directly on the delimiting element 10 . This is clearly visible in FIG. 6, which shows an axonometric view of the second embodiment variant of the chair 1 according to the invention with folded support element 14, and in FIG. 7, which shows a side view from the right with folded support element 14. In this embodiment variant, the minimum seat height of the chair 1 according to the invention with the support element 14 folded in is approximately 35 cm.

- The backrest 3b comprises a support element 15 arranged along its longitudinal direction. Furthermore, the two struts 11 in the second section 18 of the beam element 4 each have six through-openings 16, which are arranged in pairs with one another, with a pair of the A bolt 17 can be passed through openings, which serves as a support for the carrier element 15 . Depending on which of the through-openings 16 the bolt 17 is guided through, the seat element 3 can be lowered correspondingly—compare, for example, FIG arranged, which is why the bolt 17 is guided through the lowermost of the through-openings 16. In FIG. 7, in turn, the seat element 3 is arranged lower (supporting element 14 is folded in), which is why the bolt 17 is guided through the fourth-highest through-opening 16 .

Fig. 5 shows a side view from the right of the second embodiment variant of three chairs 1 according to the invention, each with the support element 14 folded out and different seat surface inclinations, with an angle between the seat 3a and the backrest 3b being left the same in each case - i.e. the relative position between the seat 3a and Backrest 3b was not changed. As a result, an angle between the backrest 3b and the beam element 4 is also the same in each of these three chairs 1 according to the invention - i.e. the relative position of the backrest 3b and beam element 4 does not change either.

It can be clearly seen in FIG. 5 that, depending on the position of the beam element 4 relative to the support cross 7, the inclination of the seat surface changes. With a small angle a between the beam element 4 and the cross-shaped support 7, the seat 3a is horizontal in this embodiment variant (left-hand representation of FIG. 5). When the angle a increases, the seat 3a inclines further and further backwards (middle and right representation of FIG. 5), the relative position of the beam element 4 and the supporting cross 7 being controlled by means of the locking element 9, in particular by means of the toothed rack 9a and the locking element 9b. is set.

8 shows an axonometric view of the second variant embodiment of the chair 1 according to the invention with the support element 14 unfolded and with the backrest 3b folded, while FIG. 9 represents a rear view and FIG. 10 a side view of this variant embodiment. In FIGS. 8 to 10 the backrest 3b is folded down in such a way that the carrier element 15 is arranged between the two struts 11 of the beam element 4 . This is possible because the backrest 3b and seat 3a are movably connected to one another - i.e. the corresponding connection can be released and fixed again after the backrest 3b has been folded down.

That is, in Figures 8 to 10, the chair 1 according to the invention is shown as a stool. Of course, it would also be possible for the chair 1 according to the invention to be designed as a stool entirely without a backrest 3b - i.e. without a backrest 3b folded down.

The bolt 17 is here arranged in the highest, ie in the sixth, through openings 16 and serves as a stop element, which a displacement of the seat element

ments 3 limited. I.e. this prevents the seat element 3 from being able to be pushed off the beam element 4 .

REFERENCE LIST

1 chair

2 support structure

3 seat element 3a seat 3b backrest

4 beam element

5 first section 5a edge region 6 leg 7 support cross 8 receiving opening 9 locking element 9a toothed rack 9b latching element 9c unlocking pin 10 limiting element

10a lead

11 strut 12 support element 13 -

14 support element

15 carrier element

16 through holes 17 bolts

18 second section

a Angle between beam element 4 and support cross 7

Claims (14)

patent claims A chair (1) comprising a support structure (2) and a seat element (3) carried by the support structure (2), the support structure (2) comprising a support cross (7) having two legs (6) and a beam element (4). , which support cross (7) and which beam element (4) can each be arranged with an edge region (5a) of a first section (5) on a base, the beam element (4) being connected to the seat element (3), characterized in that the two legs (6) of the supporting cross (7) are connected to a delimiting element (10) in a second section (18) opposite the first section (5), whereby a forms a limited receiving opening (8), through which receiving opening (8) the beam element (4) is passed and is slidably mounted in this receiving opening (8) in order to enable relative positioning of the beam element (4) with respect to the supporting cross (7), and that the support structure (2) further comprises an adjustable locking element (9), which locking element (9) acts on the support cross (7) and on the beam element (4) in order to set at least two different relative positions between the beam element (4) and the support cross (7). and to fix. 2. Chair (1) according to Claim 1, characterized in that the locking element (9) has a toothed rack (9a) and a locking element (9b), the toothed rack (9a) being connected to the beam element (4) or to the supporting cross (7 ) and the locking element (9b) is connected to the support cross (7) or to the beam element (4), wherein the toothed rack (9a) can be brought into engagement with the locking element (9b) in order to adjust and fix the relative position . 3. Chair (1) according to claim 1, characterized in that the locking element (9) comprises an unlocking bolt (9c), the limiting element (10) having a through-opening through which through-opening the unlocking bolt (9c) can be passed and connected to the beam element ( 4) is engageable. 4. Chair (1) according to one of Claims 1 to 3, characterized in that the two legs (6) of the supporting cross (7) are connected to one another by means of leaf connections, in particular by means of overlapping. 5. Chair (1) according to one of Claims 1 to 4, characterized in that the beam element (4) comprises two struts (11) at least in sections, and that the support structure (2) comprises a projection (10a), which projection (10a ) is directed from the delimiting element (10) into the receiving opening (8), the projection (10a) being arranged at least in sections between the two struts (11) in order to stabilize the beam element (4). 6. Chair (1) according to any one of claims 1 to 5, characterized in that the seat element (3) in the longitudinal direction of the beam element (4) is mounted displaceably on the beam element (4). 7. Chair (1) according to claim 6, characterized in that the beam element (4) has a stop element arranged in the second section (18) in order to limit displacement of the seat element (3). 8. Chair (1) according to one of claims 6 to 7, characterized in that the seat element (3) has a seat (3a) arranged on at least one support element (12), the seat (3a) being supported by means of the at least one support element ( 12) is slidably mounted on the beam element (4). 9. Chair (1) according to claim 8, characterized in that the at least one support element (12) can be brought into engagement with the beam element (4). 10. Chair (1) according to one of claims 8 or 9, characterized in that the seat element (3) comprises at least one support element (14), which at least one support element (14) is movably connected to the at least one support element (12) and can be arranged in such a way as to support the support element (12) on the beam element (4). 11. Chair (1) according to any one of claims 8 to 10, characterized in that the seat element (3) has two support elements (12), wherein the beam element (4) between the two support elements (12) can be clamped. 12. Chair (1) according to one of Claims 8 to 11, characterized in that the seat element (3) has at least one backrest (3b) connected to the at least one support element (12) or to the seat (3a). 13. Chair (1) according to claim 12 and according to claim 5, characterized in that the backrest comprises a support element (15) arranged along a longitudinal direction of the backrest (3b) and in that the at least two struts (11) each have at least two, preferably several , have through-openings (16), the through-openings (16) in the at least two struts (11) being arranged in pairs relative to each other, so that a bolt (17) can be passed through, on which bolt (17) the carrier element (15) can be supported. 14. Chair (1) according to claim 12 to 13, characterized in that the seat (3a) and the at least one backrest (3b) are integrally formed. 6 sheets of drawings