EP2872007B1 - Seat device - Google Patents

Description

The invention relates to a desk-seat device comprising a base frame with a base and a seat structure with a seat and a backrest.

As desk-seat devices are referred to in the context of the application seat devices in which a height of the seat, dimensions and the like is optimized for use at a desk. Such desk-seat devices are referred to in connection with the application as office work chair or short office chair. Requirements for such seating devices are specified for example in DIN EN 1335.

Out FR 958 120 A Seat devices are known with a pivotable, a seat and a backrest comprehensive seat structure, in which a pivot axis above a seat at least approximately disposed in the region of a center of gravity of a seat structure.

From the post-published document WO2013 / 167822 A1 Seat devices are known which verschwenbar about a focus from a sitting position in a reclining position.

In recent years, numerous scientific studies have confirmed that the ability of a working person with a long working day can be significantly increased by a short sleep, often called daytime sleep or power napping. It is therefore known to provide so-called bedrooms in an office. Furthermore, devices are known with which a work table or an office chair can be converted into a reclining device for a short sleep. Such retooling, however, is usually associated with a great deal of effort, so that the high conversion effort precludes the goal to allow a short sleep the worker in a short break.

It is therefore an object of the invention to provide a desk-seat device, which allows use in a lying position, without requiring a high conversion effort is required.

This object is achieved by a desk chair apparatus comprising a base frame with a base having rollers, and a seat structure having a seat surface and a backrest, wherein a pivotal mechanism is provided, by means of which the seat structure on the base frame about a horizontal pivot axis between a working - And a reclining position is pivotally mounted, wherein the pivot axis is arranged with respect to the base frame stationary above the seat at least approximately in the region of a center of gravity of the seat structure together with a designated use of the seat structure person, said base comprises rollers, by means of which the seat device is movable, and wherein the seat structure comprises a leg rest adjustable between a use position and a stowed position.

The leg or footrest allows the lower legs and / or feet to be stored in a lying position. In the use position, the leg rest is in one embodiment in a plane with the seat. In another embodiment, the leg rest is angled with respect to the seat in the use position. The leg rest is coupled in one embodiment with the pivot mechanism of the seat structure, so that when pivoting the seat structure in the lying position, the leg rest is adjusted to the use position. In other embodiments, the adjustment movements of the seat structure and the leg rest are not coupled, so that, for example, the leg rest can be brought into a working position even in the working position.

In the working position, the seat device can be used without restrictions at a desk. A pivoting movement is possible at least between the working and the lying position. In one embodiment, pivoting into any intermediate position is also possible. Due to the arrangement of the pivot axis in the center of gravity no effect Torque due to gravity on the seat structure. The position of the seat structure is thus stable in any pivoting position of the seat structure about the pivot axis, also referred to as tilting position. This makes it possible to dispense with expensive locking mechanisms. In one embodiment, however, additional locking mechanisms for fixing the seat structure are provided in a desired tilt position.

A pivoting movement of the seat structure is possible with little effort, for example by support on an armrest of the seat device. The pivoting movement is therefore initiated and executed manually in one embodiment by a user. In another embodiment, at least one drive and / or a brake is provided to pivot the seat structure and / or to lock in a certain position. The pivoting position over the maximum positions, d. H. Beyond the working position and / or the lying position, is prevented in advantageous embodiments by attacks. Due to the arrangement of the pivot axis above the seat, overturning of the seat structure is reliably prevented even in the event of a failure of the brakes and / or without limitation. Since the center of gravity of the seat structure-possibly with a person using the seat structure as intended-remains at least approximately stationary during a pivoting movement, there is also no risk of tilting of the seat device about an erection point of the base during pivoting.

The pivoting movement about the pivot axis lying at least approximately in the center of gravity also leads to a feeling of relaxation in the case of a pivoting movement in the case of a person using the seat device.

Furthermore, an embodiment is provided that the seat structure and the base frame are connected vertically adjustable, for example by means of a gas spring device. Because at one Pivoting movement between the working and lying position no displacement of the pivot axis relative to the base frame, despite a height adjustment of the seat structure is spoken relative to the base frame of a fixed pivot axis. In a further embodiment, a tilt mechanism for a dynamic sitting in the working position is provided between the seat device and the base frame. Depending on the weight of the seat surface and / or backrest and thus their influence on the center of gravity position, the center of gravity of the seat structure, possibly together with a person using the seat structure as intended, is almost the same for a large number of potential users. In order to allow adaptation to different people, balancing weights are provided in one embodiment.

In one embodiment, it is provided that the seat structure comprises a seat structure support. The seat support serves as a holding device for the seat and the backrest. In this case, in an advantageous embodiment, the seat surface and / or the backrest is adjustable relative to the pivot axis and mounted in at least two different positions fixed to the seat structure support. Due to the adjustability of the seat and / or the backrest relative to the pivot axis an adjustment of the seat device for a particular application by shifting the center of gravity in the pivot axis is possible.

In a further embodiment it is provided that the seat surface and the backrest are connected to the seat surface for a transmission of an adjustment movement of the backrest. In one embodiment, the seat and the backrest are rigidly connected. As a "rigid connection" a mechanical connection is referred to, in which the components ideally perform no relative movement to each other. In other embodiments, the seat and the backrest are elastically connected, so over a small, definable angle range a Relative movement between the seat and the backrest is possible. As a result, for example when using the seat device in a working position, a compensation movement is possible. In a further embodiment, it is provided that at least during a pivoting of the seat structure about the pivot axis, the seat and the backrest are rigidly connected to prevent relative movement between the seat and backrest upon pivoting about the pivot axis and thus a displacement of the center of gravity during pivoting , The rigid connection is effected in one embodiment by a suitable device automatically during the pivoting movement about the pivot axis. In other embodiments, it is provided that the parts are connected manually by a user. It is provided in one embodiment that only after a rigid connection of the parts a pivoting movement is released about the pivot axis.

In one embodiment of the desk-seat device, the swivel mechanism comprises two support elements assigned to the base frame, arranged laterally of the seat structure, and two rockers associated with the seat structure and pivotably mounted on the support elements. In connection with the application, a "mechanical connection of the rockers with parts of the seat structure, in particular with the seat structure support, as well as a one-part design of the rockers with parts of the seat structure, in particular with the seat structure support, are referred to as the" seat structure assigned ". In one embodiment, two of the base frame associated side armrests are provided, the armrests act as support elements on which the wings are pivotally articulated.

In another embodiment of the desk-seat device, the pivot mechanism comprises at least two concentrically arranged sheet guides. Depending on the desired swivel angle, at least two concentrically arranged, closed circular guides or open curved guides are summarized below under sheet guides, intended. The sheet guides are slidably mounted on rollers or counter-guides, so that the seat structure performs a pivoting movement about the axis, which is defined by the two centers. In advantageous embodiments, it is provided that the two sheet guides are associated with the seat structure and are slidably mounted in a counter guide associated with the base frame. In one embodiment, a course of the bending line of the two sheet guides is optimized for a pivoting movement. The two sheet guides are designed for this purpose in one embodiment as circular arc guides. In another embodiment, the sheet guides on a bending line, which differs in sections from a circular path. By a suitable choice of the bending line, in one embodiment, a force is increased at the beginning of a pivoting movement from the working position and / or from the lying position. Alternatively or additionally, it is provided by a suitable choice of the bending line in another embodiment, that the seat structure is forced into the working position and / or in the lying position without external force. The course of the bending line can be suitably selected by the person skilled in the art without difficulty, the center of gravity remaining at least approximately stationary.

In yet another embodiment of the desk-seat device, the pivot mechanism comprises two hinge devices, each of which has at least one upper arm and a forearm articulated about an arm axis to the upper arm, the upper arm being hinged to the base frame about a base axis, the lower arm an end axis is rotatably hinged to the seat structure, the base axis, the arm axis and the end axis of each hinge device intersect each other in each case a central point and the connecting line of the central points defines the pivot axis. In one embodiment, further arms are provided, which are rotatable about further arm axes that pass through the central point, wherein the forearm is not directly or directly hinged to the seat structure, but the seat structure between the two last arms of the two hinge devices, rotatable about both of them End axles is stored. Such a pivot mechanism allows pivoting about a not physically realized pivot axis. The pivot mechanism is arranged offset to the pivot axis. In advantageous embodiments, the swivel mechanism is arranged to save space below the seat, without this resulting in an impairment of the use in the working position. In addition, it is possible to provide a design of the seat structure, which is not enforced by the pivoting mechanism.

In a development, the two joint devices are constructed symmetrically with respect to the plane of symmetry between the two central points. This is advantageous for ease of storage and construction during construction and maintenance, but this is not necessary. In advantageous embodiments, however, it is at least provided that the end axes extend in a common normal plane to the pivot axis and / or that the base axes lie in a common plane.

In a further development, it is provided that the leg rest is articulated pivotably on the seat structure. In this case, in one embodiment, the leg rest is articulated pivotably about an axis arranged at a front end of the seat surface. In one embodiment, pivoting takes place by means of a folding mechanism with a stopper element projecting downwards from the seat surface, which holds the leg rest against the force of gravity in a lying position in a lying position of the seat structure in a use position.

In an alternative embodiment, the legrest is slidably mounted and hinged in a drawer. In one embodiment, the leg rest is loaded by means of a constraining force, which causes it to fold down when the leg rest is pulled out of the drawer. Further advantages of the invention will become apparent from the subclaims and from the following description of embodiments of the invention, which are shown schematically in the drawings. For identical or similar components, the same reference numbers are used in the drawings. As part of an embodiment features described or illustrated may also be used in another embodiment to obtain a further embodiment of the invention.

Fig. 1

eine perspektivische Darstellung einer Schreibtisch-Sitzvorrichtung gemäß einem ersten Ausführungsbeispiel;

Fig. 2

eine perspektivische Darstellung einer Stützstruktur der Schreibtisch-Sitzvorrichtung gemäß Fig. 1;

Fig. 3

eine Seitenansicht der Schreibtisch-Sitzvorrichtung gemäß Fig. 1;

Fig. 4

eine perspektivische Darstellung einer Sitzstruktur der Schreibtisch-Sitzvorrichtung gemäß Fig. 1 mit zwei Schwingen;

Fig. 5

eine perspektivische Darstellung einer Schreibtisch-Sitzvorrichtung gemäß einem zweiten Ausführungsbeispiel;

Fig. 6

eine Seitenansicht der Schreibtisch-Sitzvorrichtung gemäß Fig. 5;

Fig. 7

ein Detail Z der Seitenansicht der Schreibtisch-Sitzvorrichtung gemäß Fig. 5;

Fig. 8

eine Seitenansicht der einer Schreibtisch-Sitzvorrichtung gemäß einem dritten Ausführungsbeispiel;

Fig. 9

eine Rückansicht der Schreibtisch-Sitzvorrichtung gemäß Fig. 8;

Fig. 10

eine perspektivische Darstellung der Schreibtisch-Sitzvorrichtung gemäß Fig. 8;

Fig. 11

ein Detail XI der Schreibtisch-Sitzvorrichtung gemäß Fig. 10;

Fig. 12

eine Seitenansicht einer Schreibtisch-Sitzvorrichtung gemäß einem vierten Ausführungsbeispiel in einer Arbeitsstellung;

Fig. 13

eine Seitenansicht der Schreibtisch-Sitzvorrichtung gemäß Fig. 12 nach Ausziehen einer Beinauflage und

Fig. 14

eine Seitenansicht der Schreibtisch-Sitzvorrichtung gemäß Fig. 12 in einer Liegestellung.

In the drawings show:

Fig. 1

a perspective view of a desk-seat device according to a first embodiment;

Fig. 2

a perspective view of a support structure of the desk-seat device according to Fig. 1 ;

Fig. 3

a side view of the desk-seat device according to Fig. 1 ;

Fig. 4

a perspective view of a seat structure of the desk-seat device according to Fig. 1 with two wings;

Fig. 5

a perspective view of a desk-seat device according to a second embodiment;

Fig. 6

a side view of the desk-seat device according to Fig. 5 ;

Fig. 7

a detail Z of the side view of the desk-seat device according to Fig. 5 ;

Fig. 8

a side view of a desk-chair apparatus according to a third embodiment;

Fig. 9

a rear view of the desk-seat device according to Fig. 8 ;

Fig. 10

a perspective view of the desk-seat device according to Fig. 8 ;

Fig. 11

a detail XI of the desk seat device according to Fig. 10 ;

Fig. 12

a side view of a desk-seat device according to a fourth embodiment in a working position;

Fig. 13

a side view of the desk-seat device according to Fig. 12 after taking off a leg rest and

Fig. 14

a side view of the desk-seat device according to Fig. 12 in a lying position.

The Fig. 1 and 3 schematically show a desk-seat device 1 according to a first embodiment in a perspective view and a side view. Fig. 2 and 4 show parts of the desk-chair apparatus 1 according to the first embodiment. The FIGS. 5 and 6 show a perspective view and a side view of a desk-seat device 101 according to a second embodiment. Fig. 7 shows a detail Z according to Fig. 5 ,

The Fig. 8 to 10 schematically show a desk-seat device 201 according to a third embodiment in a side view, a rear view and a perspective view, respectively. Fig. 11 shows a detail XI of the desk-chair apparatus 201 according to the Fig. 8 to 10 ,

The Fig. 12 to 13 schematically show a desk-seat device 301 according to a fourth embodiment in three side views. The desk-seat device 1, 101, 201, 301 have partially the same or similar components. For these components, uniform reference numerals are used. In the following, these components will be described first.

The desk-seat devices 1, 101, 201 each comprise a base frame 2 with a base 20 and a seat structure 3 with a seat surface 30 and a backrest 31. At the base 20, rollers 21 are provided in the illustrated embodiments.

The desk-seat devices 1, 101, 201 each further comprise a pivot mechanism 4, 104, 204, by means of which the seat structure 3 about a horizontal pivot axis I between a in the Fig. 3 . 6 . 8 and 9 work position shown and one in Fig. 1 . 5 and 10 Lying arrangement shown is pivotally mounted. The pivot axis I is arranged in each case stationary relative to the base frame 2 above the seat surface 30, wherein a position of the pivot axis I is chosen so that the pivot axis I at least approximately in the region of a center of gravity of the seat structure 3 together with a not shown, intended use the seat structure 3 person is arranged.

The seat structure 3 comprises in the illustrated embodiments in each case a seat structure support 32 to which the seat surface 30 is attached. The backrest 31 and the seat surface 30 are rigidly connected to each other in the illustrated embodiments by means of an angle 33. The seat surface 30 is adjustably mounted on the seat structure support 32 in one embodiment. This makes it possible to move a center of gravity of the seat structure 3, taking into account a person using the seat structure, relative to the pivot axis I, so that the center of gravity comes to lie in the pivot axis I. In the illustrated embodiment, the Seat 30 and backrest 31 rigidly connected to the seat structure support 32.

The in the Fig. 1 to 11 illustrated desk seat devices 1, 101, 201 further comprise each a leg rest 7, on which in the lying position according to the Fig. 1 . 5 and 10 the lower legs or the feet of a user, not shown, can be stored. The leg rest 7 is - as in Fig. 3 . 6 or 8th is recognizable - stowed in the working position in a position below the seat surface 30. The leg rest 7 is displaceably mounted by means of two guide rail pairs 70, 71 relative to the seat surface 30 in a plane arranged at least approximately parallel to the seat surface. In each case, a guide rail 70 is attached to the seat structure support 32. At one end of the second, relative to the first displaceable guide rail 71, the leg rest 7 is pivotally articulated. An adjustment mechanism for the leg rest 7 further comprises a lever 72, on which a constraining force is applied by means of an element not shown in the figures. Due to the constraining force, the leg rest 7 in the extension of the guide rails 71 in the in Fig. 1 shown, with respect to the seat 30 angled position pivoted about the pivot axis 73.

The in the Fig. 12 to 14 illustrated desk seat devices 301 also includes a leg rest 307 on which in the lying position according to Fig. 13 the lower legs or the feet of a user, not shown, can be stored. The leg rest 307 is - as in Fig. 12 can be seen - stowed in the working position in a position below the seat 30. As in Fig. 13 can be seen, the leg rest 307 is pulled out of the stowage position for use. The legrest 307 is displaceably mounted by means of a pin 371 in a guide rail 370 mounted on the seat structure support 32 and in the extended position about the pin 371 pivotable. The leg rest 307 is further associated with a folding mechanism 374. The folding mechanism 374 comprises a stopper element 375 projecting downwards from the seat surface 30 and cooperating with a stop 376 arranged on the rear side of the leg rest 307. By means of two levers 377, 378, the stopper element 375 is issued during pivoting of the seat structure 3, so that the leg rest 307 pivots about the pin 371.

The pivot mechanisms 4, 104, 204 provided in the four exemplary embodiments are described below.

According to the first in the Fig. 1 to 4 illustrated embodiment and the fourth in the Fig. 12 to 14 illustrated embodiment, the pivoting mechanism 4 comprises two of the base frame 2 associated, laterally of the seat structure 3 arranged support members 40 which is integrally formed as a U-shaped support structure 400.

The support structure 400 is described in detail in FIG Fig. 2 shown. The U-shaped support structure 400 comprises a base 41 and two legs projecting from the base and acting as support elements 40. By means of the base 41, the support structure 400 with the base frame via screws 42 and a support plate 43 is firmly connected. The support structure 400 is according to the embodiment Fig. 1 to 4 relative to the base 20 by means of a known gas pressure spring device 5 mounted vertically adjustable. On the support structure 400, two armrests 6 are fastened by means of screws 60 in the embodiment.

The swing mechanism 4 further comprises two wings 44, which in detail in Fig. 4 Seat structure 3 are assigned. The rockers 44 are arranged pivotably about the pivot axis I on the support structure 400 by means of two pivot bearings 45. In a modified embodiment, the support structure 400 comprises a Perforated ring for a connection of the wings. This makes it possible to arrange the rockers 44 in different positions on the support structure 400, so as to vary a position of the pivot axis I.

The illustrated support structure 400 comprises two stops 46, 47, by means of which a maximum movement of the seat structure 3 is limited relative to the base frame 2 in the illustrated embodiment. As in Fig. 1 can be seen, acts in the radial direction closer to the pivot axis I arranged stop 47 with the rocker 44 together to prevent a pivoting movement on the lying position addition. However, the arrangement of the stops 46, 47 is merely exemplary and can be selected by a person skilled in the art.

As in Fig. 4 can be seen, the wings 44 are fastened by means of a screw 34 to the seat structure support 32. Alternatively or in addition to the above-described modified embodiment of a support structure 400 with a perforated ring for connecting the rockers 44, it is conceivable to arrange the rockers in different positions on the seat structure support 32, so as to vary a position of the pivot axis I.

The in the Fig. 5 to 7 shown pivoting mechanism 104 comprises two concentrically arranged bow guides 140, which are mechanically connected to the seat structure support 32 in the illustrated embodiment. In the illustrated embodiment, the sheet guides 140 are extended in the region of the backrest 31. The bow guides 140 thus support the backrest 31. At the same time, an aesthetically pleasing structure is created.

Fig. 7 shows a detail Z according to Fig. 5 , As in Fig. 7 can be seen, the bow guides 140 are each in a counter guide 141 with three Rollers 142 slidably mounted. The counter guide 141 is associated with the base frame 2 and mounted on the base frame 2 by means of a bracket 143. The bracket 143 is mounted vertically adjustable relative to the base 20 in advantageous embodiments. The seat device 101 further comprises two armrests 6, which are also connected to the base frame 2 by means of side plates 61 and by means of the bracket 143. The side plates 61 serve in the in Fig. 5 to 7 illustrated embodiment as a housing for the counter-guides 141, wherein in the illustration according to Fig. 5 the armrest 6 is shown offset from the counter guide 141, so that the counter guide 141 is visible.

In the Fig. 8 to 10 shown pivot mechanism 204 comprises two hinge devices 8, wherein a hinge device 8 in Fig. 11 is shown in detail. The joint devices 8 each comprise an upper arm 80 and a lower arm 81 which is rotatably hinged to the upper arm. The upper arm 80 and the lower arm 81 are pivoted to one another about a schematically illustrated arm axis 82. The upper arm 80 is further articulated about a schematically illustrated base axis 83 on the base frame 2. More precisely, the upper arm 80 is attached to a bracket 243 associated with the base frame 2. The lower arm 81 is pivoted about an end axis 84 to the seat structure 3, more specifically to the seat structure support 32. The base axis 83, the arm axis 82 and the end axis 84 intersect each other in a schematically drawn central point 85. A connecting line of the two central points 85 defines the pivot axis I.

In the illustrated embodiment, the two hinge devices 8 are similar and symmetrical with respect to in Fig. 9 drawn symmetry plane II between the central points 85 constructed.

The two hinge devices 8 allow pivotable about the pivot axis I storage, wherein the pivot mechanism 204 spaced from the pivot axis I is arranged. This makes it possible to arrange the components of the pivoting mechanism 204 below the seat surface 30 and objected to a region of use of the armrests 6. As a result, a risk of injury due to body parts of the user clamped in the area of the pivoting mechanism 204 is particularly low.

In the illustrated embodiment, each hinge device comprises two arms, namely an upper arm 80 and a lower arm 81. In other embodiments, further "arms" are provided which are each rotatably articulated about a further axis, with all other axes go through the central point 85. An advantage of such arrangements is that it is possible to form the arms short and therefore to allow a good fit in tight spaces. In still other embodiments, more than two hinge devices 8 are provided, wherein a central point of the additional hinge devices in the pivot axis I is located.

The base axes 83 are arranged on the bracket 243 and thus arranged immovably to each other. Likewise, the two end axes 84 are arranged on the common seat structure support 32 and thus immovably to each other. An orientation of the base axis 83, the arm axis 82 and the end axis 84 and a length of the upper arm 80 and / or the lower arm 81 are freely selectable within wide limits. This makes it possible to place the central points 85 in a targeted manner in dependence on, for example, a mass of the seat structure, only the lateral deflection, which takes place per angular unit, sets limits here.

In the embodiment according to the Fig. 8 to 10 the adjusting mechanism for the legrest 7 further comprises a blocking element 75. The leg rest 7 is displaceably mounted relative to the seat surface 30 by means of the two guide rail pairs 70, 71, wherein a constraining force is applied to the leg rest 7, which forces the leg rest 7 into the extended use position. The locking member 75 holds the leg rest 7 against the urging force in the stowed position. By loosening the locking element 75, the leg rest is extended semiautomatically. The leg rest 7 is in the in Fig. 8 to 10 illustrated embodiment without pad designed so that a particularly space-saving stowage is possible.

In all illustrated embodiments, an adjusting movement between the working position and the lying position is done manually. A user can be supported for this purpose, for example, on the armrests and initiate a pivoting movement in the reclining position by leaning back. In other embodiments, the pivoting mechanism comprises a drive or a plurality of drives. The drives are suitably selected according to the pivoting mechanism.

In one embodiment, a timer with a wake-up function is provided, wherein after a defined period of time a user is woken up. In one embodiment, it is provided for this purpose that at the end of the period of time, a constraining force is applied, by means of which a provision of the seat structure 3 from the lying position takes place in the working position. The coercive force is applied in a development by a drive, in another embodiment by means of a spring, which is released after the expiration of the period of time.

The materials required for the realization of the individual pivoting mechanisms 4, 104, 204, such as stainless steel, aluminum and accordingly Robust plastic are in the field of production of seating devices the skilled person sufficiently available, in knowledge of the invention, it is no problem for him to select and dimension them accordingly.

Claims (13)

1. A desk chair device comprising a base frame (2) with a pedestal (20) and a chair structure (3) with a seat (30) and a backrest (31), a pivot mechanism (4, 104, 204) being provided, by means of which the chair structure (3) is mounted on the base frame (2) in order to be pivotable about a horizontal pivot axis (I) between a work position and a reclining position, and the pivot axis (I) being arranged with respect to the base frame (2) in a fixed position above the seat (30) at least approximately in the region of a center of gravity of the chair structure (3) together with a person using the chair structure (3) as intended, characterized in that the pedestal (20) is provided with casters (21) by means of which the desk chair device can be moved around, and in that the chair structure (3) comprises a legrest (7, 307) which can be displaced between a use position and a stowed position.
2. The desk chair device according to claim 1, characterized in that the chair structure (3) comprises a chair structure support (33), wherein the seat (30) and/or the backrest (31) is/are mounted such that it/they can be adjusted relative to the pivot axis (I) and attached to the chair structure support (33) in at least two different positions.
3. The desk chair device according to claim 1 or 2, characterized in that the seat (30) and the backrest (31) are rigidly connected in order to transfer a displacement movement of the backrest (31) to the seat (30).
4. The desk chair device according to claim 1, 2 or 3, characterized in that the pivot mechanism (4) comprises two support elements (40) which are assigned to the base frame (2) and are arranged at the side of the chair structure (3), and two cranks (44) which are assigned to the chair structure (3) and are mounted on the support elements (40) such that they can be made to pivot.
5. The desk chair device according to claim 1, 2 or 3, characterized in that the pivot mechanism (104) comprises at least two curved guides (140) which are arranged concentrically.
6. The desk chair device according to claim 5, characterized in that the two curved guides (140) are assigned to the chair structure (3) and are mounted displaceably in a counterstay (141) assigned to the base frame (2).
7. The desk chair device according to claim 5 or 6, characterized in that a profile of the bending line of the two curved guides (140) is optimized for a pivoting movement.
8. The desk chair device according to claim 1, 2 or 3, characterized in that the pivot mechanism (204) comprises two articulation devices (8), each of which has at least one upper arm (80) and one lower arm (81) which is articulated to the upper arm such that it can be made to rotate about an arm axis (82), wherein the upper arm (80) is articulated to the base frame (2) such that it can be made to rotate about a base axis (83), the lower arm (81) is articulated to the chair structure such that it can be made to rotate about an end axis (84), the base axis (83), the arm axis (82) and the end axis (84) of each articulation device (8) intersect with each other in each case at a central point (85) and the line connecting the two central points (85) defines the pivot axis (I).
9. The desk chair device according to claim 8, characterized in that the two articulation devices (8) are constructed symmetrically with respect to the plane of symmetry (II) between the two central points (85).
10. The desk chair device according to claim 8 or 9, characterized in that the end axes (85) run in a common normal plane in relation to the pivot axis (I).
11. The desk chair device according to claim 7, 8 or 9, characterized in that the base axes (83) lie in a common plane.
12. The desk chair device according to any one of the preceding claims, characterized in that the legrest (7, 307) is articulated to the chair structure (3) such that it can be made to pivot.
13. The desk chair device according to any one of the preceding claims, characterized in that the legrest (7, 307) is mounted such that it can be pushed and folded into a drawer.

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