EP4464197A1 - Chair and furniture composition - Google Patents

Abstract

A chair (1) comprises a seat (2) with a seat support (21) comprising a rear buttocks region (2111) and a front knee region (2112), a height adjustment device (3) which is coupled to the seat (2), and a foot part (5) which is designed to be placed on a surface. The height adjustment device (3) is designed to change a distance (61) between the seat (2) and the foot part (5). The seat (2) is designed such that a height of the buttocks region (2111) of the seat support (21) and a height of the knee region (2112) of the seat support (21) can be changed relative to one another. The chair (1) further comprises a blocking structure (4) which is designed to block the height adjustment device (3) when the height of the buttocks region (2111) of the seat support (21) and the height of the knee region (2112) of the seat support (21) are in a target position relative to one another.

Description

technical field

The invention relates to a chair according to the preamble of independent claim 1 and a furniture composition with such a chair. Such chairs with a seat that comprises a seat support with a rear buttocks area and a front knee area, a height adjustment device that is coupled to the seat, and a foot part, wherein the height adjustment device is designed to change a distance between the seat and the foot part, can be used, for example, as swivel chairs in offices or at other workplaces.

State of the art

Height-adjustable chairs are often used in office workstations and other workplaces. Typically, the distance between the foot of the chair and the seat of the chair is adjustable using a specific device. In addition, such chairs can also be rotatable and adjustable in terms of their seat and backrest inclination. Since people often sit at a desk for long periods of time in offices, for example, the adjustability of chairs is of great importance for ergonomic reasons.

In particular, adjusting the seat height to suit the user is extremely important for comfortable, ergonomic and healthy sitting. In modern offices where workstations are changed relatively frequently, it is an advantage if the seat height can be changed and adjusted as easily as possible.

Well-known office swivel chairs often have a column-like gas spring that pushes the seat away from the foot. To adjust the seat height, a Lever operated. To reduce the seat height, the gas spring is compressed by applying a load to the seat when the lever is operated. To increase the seat height, the seat is relieved of load so that the gas spring moves the seat vertically upwards relative to the foot.

In addition to gas springs, other height adjustment mechanisms are also known that change the seat height, for example by turning or another actuation.

Although many chairs, especially office chairs, are precisely adjustable, the seat height is often not ideally adjusted to the user during use. This may be because the user does not have sufficient knowledge of what their ideal seat height is, or because the seat height mechanisms are too complicated to operate. In addition, many users find it too cumbersome to adjust the chair for a short time when their workplace changes frequently.

The object of the following invention is therefore to propose a chair with which the seat height can be adjusted individually in a comparatively simple and reliable manner. In particular, it is desirable to ensure that the height of office chairs and other chairs is adjusted to the respective user as often as possible.

representation of the invention

The object is achieved according to the invention by a chair as defined by the features of independent claim 1, and by a furniture composition as defined by the features of independent claim 15. Advantageous embodiments of the invention emerge from the dependent claims.

The essence of the invention is as follows: A chair comprises a seat, a height adjustment device, a foot part and a blocking structure. The seat has a seat support with a rear buttocks area and a front knee area. The height adjustment device is coupled to the seat. The foot part is designed to be placed on a surface. The height adjustment device is designed to change a distance between the seat and the foot part. The seat is designed such that a height of the buttocks area of the seat support and a height of the knee area of the seat support can be changed relative to one another. The blocking structure is designed to block the height adjustment device when the height of the The height of the seat support's buttocks area and the height of the seat support's knee area are in a target position relative to each other.

In principle, the chair can be any type of chair. However, the invention can be particularly advantageous for a chair that is used relatively frequently by different users. In particular, the chair can be an office chair or an office swivel chair.

The foot part can be constructed like a stand and equipped with several contact elements that come into contact with the floor when the chair is set up. This allows the chair to stand firmly on the floor and provide stable support for the seated user. The contact elements can be designed as castors, for example.

In the context of the invention, the term "seat support" refers to a supporting structure of the seat that forms or supports a seat surface. For example, the seat support can be designed directly as a seat plate that has the seat surface or can comprise such a plate. The seat surface can be provided with a cushion or a similar element to improve seating comfort. Or the seat support can hold or support such a seat plate. Alternatively or additionally, the seat support can be or comprise a frame-like structure onto which a textile or other flexible structure forming the seat surface is stretched or held in a similar manner.

The buttocks area can be an area of the seat support that is mainly loaded by the user's buttocks when the chair is used as intended. In particular, it can be adjacent to the user's buttocks or can directly accommodate them. Typically, the buttocks area is in a rear part of the chair or its seat.

Similarly, the knee area can be an area of the seat support that is loaded by the user's knees or a part of the legs close to the knees during normal use of the chair. Typically, the knee area is in a front part of the chair.

By being designed to change the distance between the seat and the footrest, the height adjustment device can adjust the seat height of the chair or This allows the seat height to be adjusted to suit the user.

The blocking structure can be designed in different ways to block the height adjustment device. For example, it can have a movable element that is placed in the way of the height adjustment in a suitable way to block the height adjustment device. The height adjustment device can be blocked by preventing its ability to move. In another example, the blocking structure can block the height adjustment device by disengaging it from the seat and/or the foot part. In this way, the height adjustment device can no longer exert any effect on the seat or the foot part when blocked. In a particularly advantageous embodiment, as described in more detail below, for example, the height adjustment device has a gas spring and the blocking structure comprises elements or a mechanism that actuates a valve of the gas spring. The mechanism can be designed in different ways to match the design of other components of the chair. One possible mechanism of this kind with a slide, guide and rocker is described in more detail below. To unblock the height adjustment device, the blocking structure can actuate the valve again.

The blocking structure allows the height adjustment device to be blocked so that the distance between the seat and the footrest can no longer be changed as long as the seat is being loaded by the user or as long as the user is sitting on the chair. Blocking the height adjustment device can prevent the seat height from being adjusted when the user is sitting on the chair and the seat height is set. In particular, the seat height cannot be adjusted automatically as soon as the buttocks and knees are in the target position relative to each other.

The target position of the buttocks and knees can be designed to ensure that the user's knees and buttocks or thighs are also in a target position or in a target alignment when the height adjustment element is blocked by the blocking structure. In particular, the height adjustment can be blocked in a target inclination of the user's thighs. For example, a The desired target inclination defines an approximately horizontal alignment of the thighs. For example, if the thighs are in a substantially horizontal alignment, it can be assumed that the seat height is correctly adjusted.

With the blocking structure according to the invention, the chair can be automatically adjusted to a suitable individual seat height. An automatic height adjustment can be provided that ensures that the user always finds a preferred or suitable seat height. This can be particularly advantageous for users who change frequently. The seat height can be automatically adjusted individually in a relatively simple and reliable manner and it can be ensured that the chair is always adjusted to the respective user as soon as he or she sits on the chair.

The height of the seat support's buttocks area and the height of the seat support's knee area relative to each other can also be referred to as the height ratio between the buttocks area and the knee area. This height ratio can be designed to be changeable in different ways. In one possible embodiment, the seat support is split so that the buttocks and knee areas can be adjusted independently of each other. For example, the buttocks area can be formed by a separate section or a separate component of the seat support, which is flexible or movable in height compared to or in relation to the rest of the seat support.

Preferably, in order to change the height of the seat support's buttocks area and the height of the seat support's knee area relative to one another, the seat is designed to tilt the seat support about a tilt axis, wherein the blocking structure is designed to block the height adjustment device when the seat support of the seat is tilted to a predefined target inclination. The tilt axis can be a physical element, such as a rod-shaped axis or rotatable fastening. Or it can be a quasi-virtual axis formed by other elements or components. An inclination of the seat support - i.e. the position of the buttocks area and the knee area relative to one another - can define an alignment of the thighs of the user of the chair. The target inclination can be defined such that the thighs are aligned quasi-horizontally.

The seat preferably defines a sitting direction from the buttocks area to the knee area, wherein the tilt axis preferably runs essentially at right angles to the sitting direction and wherein furthermore preferably the seat support is mounted so as to be tiltable about the tilt axis. In this embodiment, the tilt axis can in particular be implemented as a stable physical component.

The seat preferably comprises a seat support pressure element which presses the height of the seat support's buttocks area and the height of the seat support's knee area towards each other into a basic position, whereby the basic position is different from the target position. In the basic position, the height of the buttocks area is advantageously greater than the height of the knee area. When sitting down on the chair, it can be taken into account that the user's legs are relatively stretched when they first sit down and become more and more bent as they sit down. With a tiltable seat support, the basic position can be an inclined position in which a seat surface of the seat is inclined from front to back.

The seat support pressure element preferably comprises a spring. For example, the spring can be a spiral spring or a torsion spring acting on the tilt axis. Such a spring enables a comparatively simple and efficient implementation of the seat support pressure element.

In a preferred embodiment, the height adjustment device comprises a height pressure element which pushes the seat away from the foot part.

A chair with such a height pressure element can also be implemented without a blocking structure. In particular, such a chair can have the following: a seat that includes a seat support with a rear buttocks area and a front knee area, a height adjustment device that is coupled to the seat, and a foot part that is designed to be placed on a surface. The height adjustment device is designed to adjust a distance between the seat and the foot part, and the seat is designed such that a height of the buttocks area of the seat support and a height of the knee area of the seat support can be changed relative to one another, wherein the height adjustment device has a height pressure element that pushes the seat away from the foot part.

In addition, such a chair which does not include a locking structure may have the features of the preferred embodiments of the chair with locking structure listed above and below.

By pushing the seat away from the footrest, the height pressure element can ensure that the chair is at the maximum seat height or the basic position when the seat support is not under any load or the chair is not in use. The height pressure element can also be used to help the user stand up. For example, an elderly user or one with limited mobility can be supported when standing up using the height pressure element.

Different elastic or springy structures can be used as the height pressure element. The blocking structure can be designed in different ways depending on the type of height pressure element. For example, the elasticity of an elastic structure can be limited or prevented in order to block the height adjustment device. Or its elastic effect can be prevented by using an inelastic element to limit the extent of the elastic effect.

The height pressure element of the height adjustment device preferably comprises a gas spring. The gas spring can in particular be designed such that it is extended in a zero position and thus pushes the seat away from the footrest. Using the height pressure element, the chair can always be at a maximum seat height when it is not in use or when the seat is not under load. This enables efficient adjustment of the preferred individual seat height and also provides a stand-up aid.

The blocking structure preferably has a release mechanism which is designed to release the gas spring of the height adjustment device when actuated, and a locking mechanism which is designed to lock the gas spring of the height adjustment device when actuated. Gas springs are typically equipped with a valve. In many designs, the gas spring acts when the valve is open and is rigid when the valve is closed. The release mechanism can be designed to open the valve of the gas spring when actuated, and the locking mechanism can be designed to close the valve of the gas spring when actuated.

The release and locking mechanisms can be designed in different ways to suit the structural design of the chair. In particular, in addition to the preferred mechanism for locking and releasing the gas spring described in more detail below, numerous other structural solutions are possible that enable the gas spring valve to be operated. For example, they could each include a switch. They can also be implemented as an integral construction in which the same mechanism functions as a locking mechanism or as a release mechanism in different states. In such a design, one can speak of a locking-release mechanism. The release or locking mechanisms can also be equipped with electronic components such as sensors or circuits, so that, for example, the gas spring can be activated depending on an electronically determined angle of the seat.

The seat and the locking mechanism of the blocking structure are preferably arranged such that the seat actuates the locking mechanism when the height of the buttocks area of the seat support and the height of the knee area of the seat support are in the target position relative to each other.

The locking mechanism of the blocking structure is preferably coupled to a valve of the gas spring of the height adjustment device such that the valve is switched when the locking mechanism is actuated. In this way, the blocking structure can be implemented simply and effectively.

Preferably, the locking mechanism comprises a carriage, a guide and a rocker, wherein the carriage is coupled to the guide or mounted in the guide so that it is movable along the guide, wherein the rocker is coupled to the valve so that it closes the valve in a first tilting position, wherein the carriage is coupled to the seat support so that it is moved along the guide when the seat support tilts in particular about the tilting axis, and wherein the carriage is moved along the guide so that it tilts the rocker into the first tilting position when the seat support of the seat is tilted to a predefined target inclination. Such a locking mechanism can enable a stable and expedient realization of the blocking structure.

The seat and the release mechanism of the blocking structure are preferably arranged such that the seat actuates the release mechanism when the height of the seat support's buttocks area and the height of the seat support's knee area are outside the target position relative to each other. For example, the position of the buttocks area and the knee area outside the target position can be a position in the basic position or advantageously a position between the target position and the basic position.

The release mechanism of the blocking structure is preferably coupled to a valve of the gas spring of the height adjustment device in such a way that the valve is switched when the release mechanism is actuated. In this way, the blocking structure can be implemented simply and effectively.

Another aspect of the invention relates to a furniture composition with a chair as described above and a height-adjustable table, wherein the chair has a transmitting unit and the table has a receiving unit. The transmitting unit of the chair is designed to send a height signal representing a seat height when the blocking structure blocks the height adjustment device. The receiving device of the table is designed to receive the height signal and, based on the height signal, to automatically set a table height adapted to the seat height. Such a furniture composition enables the seat height of the chair to be automatically adjusted to the user as described above and, at the same time, the table height to be automatically adjusted to the set seat height. This enables a workstation to be adapted particularly efficiently to the individual circumstances of the user.

Short description of the drawings

Fig. 1

eine perspektivische Ansicht eines Ausführungsbeispiels eines erfindungsgemässen Stuhls;

Fig. 2

eine seitliche Schnittansicht an den Stuhl von Fig. 1 in einer Grundstellung;

Fig. 3

eine perspektivische Ansicht einer Blockierstruktur des Stuhls von Fig. 1;

Fig. 4

eine Schnittansicht der Blockierstruktur von Fig. 3 in einer freigegebenen Position, wobei sich eine Wippe der Blockierstruktur in einer ersten Kippstellung befindet;

Fig. 5

eine seitliche Schnittansicht an den Stuhl von Fig. 1, während eines Belastungsvorgangs;

Fig. 6

eine seitliche Schnittansicht an den Stuhl von Fig. 1 in einer Zielstellung; und

Fig. 7

eine perspektivische Ansicht der Blockierstruktur von Fig. 3 in einer blockierten Position, wobei sich die Wippe der Blockierstruktur in einer zweiten Kippstellung befindet.

Further advantageous embodiments of the invention emerge from the following description of embodiments of the invention with the aid of the schematic drawing. In particular, the chair according to the invention is described in more detail below with reference to the attached drawings using embodiments. They show:

Fig. 1

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

Fig. 2

a side sectional view of the chair from Fig. 1 in a basic position;

Fig. 3

a perspective view of a blocking structure of the chair of Fig. 1 ;

Fig. 4

a sectional view of the blocking structure of Fig. 3 in a released position, with a rocker of the blocking structure in a first tilting position;

Fig. 5

a side sectional view of the chair from Fig. 1 , during a loading process;

Fig. 6

a side sectional view of the chair from Fig. 1 in a target position; and

Fig. 7

a perspective view of the blocking structure of Fig. 3 in a blocked position, with the rocker of the blocking structure in a second tilting position.

way(s) of carrying out the invention

Certain terms are used in the following description for convenience and are not to be construed as limiting. The words "right," "left," "bottom," and "top" indicate directions in the drawing to which reference is made. The terms "inward," "outward," "below," "above," "left," "right," or similar are used to describe the arrangement of designated parts relative to one another, the movement of designated parts relative to one another, and the directions toward or away from the geometric center of the invention and designated parts thereof as shown in the figures. These spatial relative terms also include positions and orientations other than those shown in the figures. For example, if a part shown in the figures is turned over, elements or features described as "below" are then "above." The terminology includes the words expressly mentioned above, derivatives of the same, and words of similar meaning.

In order to avoid repetitions in the figures and the associated description of the various aspects and embodiments, certain features should be understood as common to different aspects and embodiments. The omission of an aspect in the description or a figure does not imply that this aspect is missing in the associated embodiment. Rather, such an omission can serve to ensure clarity and prevent repetitions. In this context, the following definition applies to the entire further description: If reference symbols are included in a figure for the purpose of graphic clarity, but in the immediately associated If reference symbols are not mentioned in the descriptive text, reference is made to their explanation in the preceding figure descriptions. If reference symbols are also mentioned in the descriptive text directly associated with a figure that are not contained in the associated figure, reference is made to the preceding and following figures. Similar reference symbols in two or more figures stand for similar or identical elements.

Fig. 1 shows a perspective view of an embodiment of a chair 1 according to the invention with a seat 2, a height adjustment device 3 and a blocking structure 4. The height adjustment device 3 comprises a gas spring 31 and a coupling part 32. The coupling part 32 is equipped with a sleeve-shaped gas spring receptacle 321, which encompasses a longitudinal end of the gas spring 31.

The seat 2 comprises a seat support 21 with a seat plate 211 and a seat support frame 212, a manual release lever 22 and a base frame 23. The base frame 23 is fixedly connected to the coupling part 32 so that the base frame 23 and the coupling part 32 form a unit. The seat plate 211 has a rear, slightly upwardly curved buttocks area 2111 and a front, slightly downwardly curved knee area 2112. The seat plate 211 defines a seating direction 213 from the buttocks area 2111 to the knee area 2112.

In Fig. 2 the chair 1 is shown in a sectional side view, wherein it is in a basic position. In particular, the height of the buttocks area 2111 of the seat plate 211 and the height of the knee area 2112 of the seat plate 211 are in a basic position relative to one another or a height ratio between the buttocks area and the knee area is in a basic position or has a basic size. The chair 1 comprises a foot part 5, which is intended to be placed on a floor or a similar surface. The gas spring 31 of the height adjustment device 3 has an upright gas cylinder 311 with a hollow interior, a piston rod 312 and a valve 313. The piston rod 312 extends from above into the hollow interior of the gas cylinder 311.

In the Fig. 2 In the basic position of the seat shown, the gas spring 31 is extended to the maximum. This means that the piston rod 312 is pushed out of the gas cylinder 311 as far as possible by the gas in the interior of the gas cylinder 311. As a result, the coupling part 32 and with it the seat 2 are pushed away from the foot part 5 as far as possible and the Seat 2 or the coupling part 32 is located at a basic distance 61 from the foot part 5.

The seat support frame 212 of the seat support 21 of the seat 2 is fixedly attached to an underside of the seat plate 211, so that the seat support frame 212 and the seat plate 211 form a unit. The seat support frame 212 is coupled approximately centrally to an articulated rod 41 of the blocking structure 4 so that it can rotate. The articulated rod 41 is in turn rotatably connected to a slide 42 of the blocking structure 4 so that the seat support frame 212 is articulated to the slide 42. The seat 2 comprises a tilt arm 24 which connects the seat support frame 212 to the base frame 23 so that it can tilt about a tilt axis 26 running at right angles to the seat direction 213. A torsion spring 25 is provided on the tilt axis 26, the spring force of which deflects the seat support frame 212 to the base frame 23 to the maximum extent so that the seat plate 211 describes a basic inclination N ₀ . In the basic inclination N _0, a difference between a height of the buttocks area 2111 of the seat plate 211 and a height of the knee area 2112 of the seat plate 211 is maximum, so that a height ratio between the buttocks area 2111 and the knee area 2112 is also maximum.

Fig. 3 shows a more detailed perspective view of the blocking structure 4. The blocking structure 4 comprises, in addition to the joint rod 41 and the slide 42, a slide guide 43 and a rocker 44. The slide 42 is mounted on the coupling part 32 of the height adjustment device 3 via the slide guide 43 in such a way that it can be moved linearly to the coupling part 32 within a predefined range. The rocker 44 is arranged in the slide 42 and has a beveled front side 441. The slide 42 is equipped with a ramp element 421 that is assigned to the front side 441 of the rocker 44. In particular, when the slide 42 is in a sliding position along the slide guide 43, it contacts the front surface 441 and when the slide 42 is moved further, it tilts the rocker 44.

As shown in the cross-sectional view of Fig. 4 The rocker 44 is clearly coupled to the valve 313 of the gas spring 31. In the basic position of the chair 1, the valve 313 of the gas spring 31 is open. When the seat plate 211 is not loaded, the seat plate 211 is pushed upwards by the gas spring 31 and the chair 1 is at the highest seat height. The rocker 44 is not in engagement with the ramp element 421 of the slide 42 and is in a first tilting position - in the view of Fig. 4 tilted to the left. As mentioned, in this position the valve 313 of the gas spring 31 is open.

Fig. 5 shows the chair 1 while it is being loaded. The user sits on the seat plate 211 with his buttocks on the buttocks area 2111. As a result, the seat plate 211 is tilted about the tilt axis 26 in accordance with the inclination of the user's thighs, increasingly against the spring force of the torsion spring 25, so that the seat plate 211 describes an intermediate inclination N _1. The intermediate inclination N ₁ is smaller than the basic inclination N ₀ . By tilting the seat plate 211 from the basic inclination N ₀ to the intermediate inclination N _1, the joint rod 41 presses the carriage 42 backwards. In this way, the ramp section 421 is moved towards the front surface 441 of the rocker 44. The rocker 44 has not yet tilted, however, and the valve 313 of the gas spring 31 is still open.

On the other hand, when the user sits down, the user's weight presses the piston rod 312 of the gas spring 31 into the gas cylinder 311. The gas arranged in the interior of the gas cylinder 311 is thereby compressed and the gas spring 31 is pushed together. In this way, the seat 2 is moved in the direction of the foot part 5 so that the seat 2 and the foot part 5 are separated by an intermediate distance 62. The intermediate distance 62 is smaller than the basic distance 61 and the seat height of the chair 1 is reduced accordingly.

In Fig. 6 the chair 1 is shown in an end position in which the height of the buttocks area 2111 of the seat plate 211 and the height of the knee area 2112 of the seat plate 211 are in a target position relative to one another or in which the height ratio between the buttocks area and the knee area is in a target position or has a target size. In the target position or target position, the height ratio is smaller than in the basic position or basic position. When sitting down, the user has tilted the seat plate 211 about the tilt axis 26 against the spring force of the torsion spring 25 so far that it is aligned quasi horizontally or slightly inclined backwards at a target inclination N ₃ . The target inclination N ₃ is smaller than the intermediate inclination N ₂ . The user's thighs are also quasi horizontal in the target position, which corresponds to a predefined preferred sitting position.

In the target position, the slide 42 is pushed or slid further back along the slide guide 43 by the link rod 41. As in Fig. 7 As can be seen, the ramp section 421 presses on the rocker 44 and tilts it into a second tilting position - in the view of Fig. 4 to the right. This will Valve 313 of the gas spring 31 is closed and the gas spring 31 is blocked or rigid. The rocker 44 and the ramp element 421 together form a locking mechanism. The seat height in the target position is thus fixed to a target distance 63 between the coupling part 32 or seat 2 and foot part 5 and adjusted to suit the user.

When the user gets up from the chair 1 again, the seat plate 211 is pushed upwards about the tilt axis 26 by the spring force of the torsion spring 25 until it is again at the basic inclination N ₀ to the base frame 23. As a result, the slide 42 of the blocking structure 4 is pulled forwards by the joint rod 41. The ramp section 421 moves away from the rocker 44 again and this tilts again in the other direction, so that the valve 313 of the gas spring 31 is opened. The rocker 44 and the ramp element 421 together form a release mechanism. As a result, the spring force of the gas spring 31 acts on the seat plate 211 and pushes it vertically upwards. The seat height is increased again accordingly until the basic distance 61 is restored. The chair 1 is now back in the starting position or basic position and ready for the next user.

By equipping the chair 1 with a manual release lever 22, the seat height of the chair 1 can also be adjusted manually. In particular, the valve 313 can be opened manually, for example, using the manual release lever 22, so that the distance between the foot part 5 and the seat 2 can be changed. In this way, the seat height can be readjusted if the automatically adjusted seat height does not exactly match the user's preferences.

Although the invention is illustrated and described in detail by means of the figures and the associated description, this illustration and this detailed description are to be understood as illustrative and exemplary and not as limiting the invention. In order not to obscure the invention, in certain cases well-known structures and techniques may not be shown and described in detail. It is understood that those skilled in the art can make changes and modifications without departing from the scope of the following claims. In particular, the present invention covers further embodiments having any combinations of features that may differ from the explicitly described combinations of features.

The present disclosure also includes embodiments with any combination of features mentioned or shown above or below for various embodiments. It also includes individual features in the figures, even if they are shown there in connection with other features and/or are not mentioned above or below. The alternatives of embodiments described in the figures and the description and individual alternatives of their features can also be excluded from the subject matter of the invention or from the disclosed subject matters. The disclosure includes embodiments that exclusively include the features described in the claims or in the exemplary embodiments, as well as those that include additional other features. The disclosure also includes intermediate generalizations of features or groups of features of exemplary embodiments shown in the figures and the associated sections of the description. This means that specific features or groups of features as disclosed in the figures and the associated sections of the description can be combined in the more general embodiments of the invention as disclosed in connection with the description of the invention. In particular, such specific features or groups of features can be provided in the more general embodiments of the invention, independent of other specific features shown in the figures. For example, the blocking structure shown in the figures can be designed with a different locking mechanism than the slide, guide and rocker shown in the figures. In particular, a different mechanism can be used if the chair has a different structure. It is understood that experts are able to incorporate specific features from the description of the figures into the embodiments of the description of the invention.

Furthermore, the expression "comprising" and derivatives thereof do not exclude other elements or steps. Likewise, the indefinite article "a" or "an" and derivatives thereof do not exclude a plurality. The functions of several features listed in the claims can be fulfilled by one unit or one step. The terms "essentially", "about", "approximately", "quasi" and the like in connection with a property or a value in particular also precisely define the property or the value. The terms "about", "quasi" and "approximately" in connection with a given numerical value or range may refer to a value or range that is within 20%, within 10%, within 5% or within 2% of the given value or range. All reference signs in the claims are not to be construed as limiting the scope of the claims.

Claims (15)

Chair (1) with a seat (2) comprising a seat support (21) with a rear buttocks area (2111) and a front knee area (2112), a height adjustment device (3) coupled to the seat (2), and a foot part (5) which is designed to be placed on a surface, wherein the height adjustment device (3) is designed to change a distance (61, 62, 63) between the seat (2) and the foot part (5), and wherein the seat (2) is designed such that a height of the buttocks region (2111) of the seat support (21) and a height of the knee region (2112) of the seat support (21) are variable relative to one another, characterized by a blocking structure (4) designed to block the height adjustment device (3) when the height of the buttocks region (2111) of the seat support (21) and the height of the knee region (2112) of the seat support (21) are in a target position relative to one another. Chair (1) according to claim 1, wherein in order to change the height of the buttocks region (2111) of the seat support (21) and the height of the knee region (2112) of the seat support (21) relative to one another, the seat (2) is designed to tilt the seat support (21) about a tilt axis (26), and wherein the blocking structure (4) is designed to block the height adjustment device (3) when the seat support (21) of the seat (2) is tilted to a predefined target inclination (N ₂ ). Chair (1) according to claim 2, wherein the seat (2) defines a seating direction (213) from the buttocks region (2111) to the knee region (2112) and wherein the tilt axis (26) extends substantially perpendicular to the seating direction (213). Chair (1) according to claim 3, wherein the seat support (21) is mounted so as to be tiltable about the tilt axis (26). Chair (1) according to one of the preceding claims, wherein the seat (2) comprises a seat support pressure element (25) which presses the height of the buttocks region (2111) of the seat support (21) and the height of the knee region (2112) of the seat support (21) towards each other into a basic position, wherein the basic position is different from the target position. Chair (1) according to claim 5, wherein the seat support pressure element (25) comprises a spring. Chair (1) according to one of the preceding claims, wherein the height adjustment device (3) has a height pressure element (31) which presses the seat (2) away from the foot part (5). Chair (1) according to claim 7, wherein the height pressure element (31) of the height adjustment device (3) comprises a gas spring (31). Chair (1) according to claim 8, wherein the blocking structure (4) has a release mechanism (44, 421) which is designed to release the gas spring (31) of the height adjustment device (3) when actuated, and a locking mechanism which is designed to lock the gas spring (31) of the height adjustment device (3) when actuated. Chair (1) according to claim 9, wherein the seat (2) and the locking mechanism (44, 421) of the blocking structure (4) are arranged such that the seat (2) actuates the locking mechanism (44, 421) when the height of the buttocks region (2111) of the seat support (21) and the height of the knee region (2112) of the seat support (21) are in the target position relative to each other. Chair (1) according to claim 10, wherein the locking mechanism (44, 421) of the blocking structure (4) is coupled to a valve (313) of the gas spring (31) of the height adjustment device (3) such that the valve (313) is switched when the locking mechanism (44, 421) is actuated. Chair (1) according to claim 2 and 10, wherein the locking mechanism (44, 421) comprises a carriage (42), a guide (43) and a rocker (44), wherein the carriage (42) is coupled to the guide (43) so that it is movable along the guide (43), wherein the rocker (44) is coupled to the valve (313) so that it closes the valve (313) in a first tilting position, wherein the carriage (42) is coupled to the seat support (21) so that it is moved along the guide (43) when the seat support (21) tilts, and wherein the carriage (42) is moved along the guide (43) so that it tilts the rocker (44) into the first tilting position when the seat support (21) of the seat is tilted to a predefined target inclination (N ₂ ). Chair (1) according to one of claims 9 to 12, wherein the seat (2) and the release mechanism (44, 421) of the blocking structure (4) are arranged such that the seat (2) actuates the release mechanism (44, 421) when the height of the buttocks region (2111) of the seat support (21) and the height of the knee region (2112) of the seat support (21) are outside the target position relative to one another. Chair (1) according to claim 13, wherein the release mechanism (44, 421) of the blocking structure (4) is coupled to a valve (313) of the gas spring (31) of the height adjustment device (3) such that the valve (313) is switched when the release mechanism (44, 421) is actuated. Furniture composition comprising a chair (1) according to one of the preceding claims and a height-adjustable table, wherein the chair (1) has a transmitting unit and the table has a receiving unit, wherein the transmitting unit of the chair (1) is designed to send a height signal representing a seat height when the blocking structure (4) blocks the height adjustment device (3), and wherein the receiving device of the table is designed to receive the height signal and, based on the height signal, to automatically set a table height adapted to the seat height.

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