EP0343450B1 - Chair, in particular a work or office chair - Google Patents

Chair, in particular a work or office chair Download PDF

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Publication number
EP0343450B1
EP0343450B1 EP89108563A EP89108563A EP0343450B1 EP 0343450 B1 EP0343450 B1 EP 0343450B1 EP 89108563 A EP89108563 A EP 89108563A EP 89108563 A EP89108563 A EP 89108563A EP 0343450 B1 EP0343450 B1 EP 0343450B1
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EP
European Patent Office
Prior art keywords
seat
backrest
chair
pivot
levers
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP89108563A
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German (de)
French (fr)
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EP0343450A1 (en
Inventor
Günter Kratz
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Haworth Buroeinrichtungen GmbH
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R O E D E R GmbH
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Priority to AT89108563T priority Critical patent/ATE75114T1/en
Publication of EP0343450A1 publication Critical patent/EP0343450A1/en
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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C3/00—Chairs characterised by structural features; Chairs or stools with rotatable or vertically-adjustable seats
    • A47C3/02—Rocking chairs
    • A47C3/025—Rocking chairs with seat, or seat and back-rest unit elastically or pivotally mounted in a rigid base frame
    • A47C3/026—Rocking chairs with seat, or seat and back-rest unit elastically or pivotally mounted in a rigid base frame with central column, e.g. rocking office chairs; Tilting chairs
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C1/00—Chairs adapted for special purposes
    • A47C1/02—Reclining or easy chairs
    • A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03255—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest with a central column, e.g. rocking office chairs

Definitions

  • the invention relates to a chair, in particular a work or office chair, with a seat which can be pivoted in the front region about a horizontal pivot axis and whose inclination can be changed and, depending on the change in inclination of the seat, by means of an adjusting device, the inclination of the backrest which can be changed disproportionately, in which with increasing inclination of the seat, the backrest executes an additional relative movement downwards relative to the facing end of the seat, in which pivot levers are articulated on the support arms of the chair frame directed towards the front, the free ends of which are attached to the backrest in a fixed and non-rotatable manner and carry them, in which the seat is rotatably mounted on these swivel levers and is articulatedly supported on the chair frame in the front region via at least one entraining lever and in which the swivel levers designed as armrests or armrests are arranged on both sides of the seat.
  • Such a chair is known from DE-U-86 16 836.
  • the known chairs of this type offer excellent seating comfort, since on the one hand they provide a clear support for the back of the user in the starting or working position thanks to the practically vertical position of the backrest, but on the other hand they allow relaxed sitting after the backrest is tilted back.
  • the backrest When the backrest is tilted backwards, the user's upper body does not simply make one Swiveling movement, but there is a movement superimposed from different movement components. Since the backrest executes an additional downward movement towards the seat when tilting backwards, a relative movement between the back of the user and the backrest is avoided or at least reduced to an undetectable value.
  • the swivel levers are rotatably mounted in the rear area of the seat and the swivel levers are rotatably mounted on the central column of the chair frame, the swivel levers are for the most part below the seat and cannot be designed directly as an armrest or armrest.
  • the driving lever in the arrangement shown does not cause the front edge of the seat to sink when the backrest support is tilted backwards.
  • multi-link lever chains are used, as shown in EP 0 176 816 A1, or, on the other hand, pairs of transmission levers and drive arches as shown in EP 0 085 870 A1.
  • many parts are required for the adjustment device.
  • the same also applies to a chair according to DE 29 16 897 A1, in which, when the seat is pulled out, the backrest on the backrest bar is displaced in the direction of the seat.
  • pivot levers between the articulation axis on the support arms and the fixed connection point on the backrest carry downwardly projecting bearing tabs on which the seat is rotatably supported with its central region.
  • the swivel levers Due to this articulation of the swivel levers with the mounting brackets, the swivel levers will for the most part lie above the seat and can even take over the function of armrests or armrests.
  • the guide lever also lowers the front edge of the seat, which improves seating comfort when the backrest support is tilted back and the seat angle is increased.
  • the swivel levers and the entraining lever (s) only require robust swivel joints that work reliably.
  • a further embodiment provides that the swivel levers in Area of the articulation axis are angled downwards and run approximately parallel to the bearing brackets for the seat.
  • one embodiment provides that the axis of rotation of the entraining lever or arms on the support arms is arranged facing the front end of the seat in front of the articulation axis of the swivel lever.
  • the lower end of the backrest is connected to the rear region of the seat via a length compensation member.
  • the backrest and seat then form a single unit.
  • the shapely transition from the seat to the backrest is further improved in that the seat has an upward extension at the rear end, the is preferably positively connected to the lower end of the backrest via the length compensation member.
  • the length compensation member is formed from two telescopic parts, then the two parts are connected to the seat and the backrest and covered by means of a bellows.
  • the length compensation element does not have to perform a load-bearing function, it only covers the changing distance between the rear area of the seat and the lower end of the backrest.
  • the elastically designed length compensation member can also itself be designed as a bellows.
  • the pivot bearing of the seat on the pivot levers is solved according to the invention so that the pivot levers between the articulation axis on the support arms and the fixed connection point on the backrest carry downwardly projecting bearing tabs on which the seat is rotatably mounted.
  • the seat can also have mounting brackets for the mounting bolts or even carry the mounting bolts.
  • the seat When lowering the seat, the seat is moved in the direction of the backrest if the design is such that the pivot axis of the pivot lever is arranged below the horizontal pivot axis of the front region of the seat, and that the axis of rotation of the entraining lever or arms on the support arms is the front End of the seat facing the pivot axis of the pivot lever is arranged.
  • Fig. 1 shows schematically how the seat 20 and the backrest 25 are connected to the adjusting device and which parts the adjusting device comprises.
  • the column 10 of the chair frame merges into support arms 11 directed towards the front of the chair.
  • pivot levers 13 are articulated on both sides of the seat, as the articulation axis 12 shows.
  • the seat 20 is rotatably supported with a central area on bearing tabs 14 of the pivot lever 13.
  • the seat 20 can have bearing brackets 23 which receive the bearing bolts for the axis of rotation 15.
  • the free ends of the pivot levers 13 are connected to the backrest 25 as a fixed, non-rotatable connection point 16.
  • the front area of the seat 20 carries bearing brackets 22 for the horizontal pivot axis 19.
  • the carrying levers 17 are preferably also pivotably mounted on the bearing brackets 22 on both sides of the seat 20, and are supported in an articulated manner on the support arms 11 via the axes of rotation 18.
  • the axes of rotation 18 of the entraining lever 17 face the front end of the seat 20 and the pivot axis 13 of the pivot lever 13.
  • the rear end of the seat 20 goes into the upward extension 21, which is connected to the lower end of the backrest 25 via the length compensation member 24.
  • This length compensation member 24 has no load-bearing function, it merely covers the changing distance between the extension 21 of the seat 20 and the lower end of the backrest 25 in an elegant manner.
  • the pivot levers 13 are also adjusted in the direction 27.
  • the swivel angle of the swivel levers 13 is increased due to the distance between the axes of rotation 15 and the articulation axes 12.
  • the entraining levers 17 perform a swiveling movement in the same direction, so that the seat 20, in addition to a lowering in the front region, also a displacement in the direction of the backrest 25 experiences.
  • the backrest 25 executes the inclination movement 28, which is greater than the inclination movement of the seat 20. Since the connection point 16 is rigid, the backrest 25 is forcibly adjusted in the direction 29.
  • the length compensation member 24 allows this movement.
  • the length compensation member 24 takes on the adaptation of the changing distance between the lower end of the backrest 25 and the extension 21 of the seat 20th
  • Fig. 2 shows an embodiment of a chair on an enlarged scale.
  • a swivel lever 13 and an entraining lever 17 are arranged on both sides of the seat 20.
  • Two support arms 11 extend from the column of the chair frame, not shown, which extend to the front region of the seat 20.
  • the seat 20 can consist of a seat support and seat cushion be composed.
  • the pivot levers 13 initially go upward from the articulation axis 12 with an angled section and then extend inclinedly into the lower region of the backrest 25, which can also be composed of a backrest support and a backrest cushion.
  • the ends of the pivot levers 13 are fixed and non-rotatably connected to the backrest 25, as the connection point 16 shows.
  • downward-facing bearing brackets 14 are attached in the front area and run approximately parallel to the angled end sections of the swivel levers 13.
  • About the middle region of the seat 20 is rotatably mounted on the bearing brackets 14, as the axis of rotation 15 shows.
  • further mounting brackets are attached, on which the entraining levers 17 are mounted so as to be pivotable about the horizontal pivot axis 19.
  • the driving levers 17 are articulated on the support arms 11 via the axes of rotation 18. In the starting position, the pivot axis 19 of the driving lever 17 and thus the horizontal pivot axis of the seat 20 lie above the pivot axis 12 of the pivot lever 13.
  • the axes of rotation 18 of the pivot lever 17 face the front end of the seat 20 in front of the pivot axis 12 of the pivot lever 13. With the distance of the axes of rotation 15 from the articulation axes 12 is the measure of the increase in the angle of inclination of the backrest 25 when the seat 20 is lowered.
  • the swivel levers 13 are also adjusted in the same swivel direction via the mounting brackets 14, the swivel angle of the swivel lever 13 being correspondingly greater than the swivel angle of the seat 20.
  • the driving levers 17 are also pivoted in the direction of the backrest 25.
  • the backrest 25 can be adjusted up to a 25 'marked end position, the seat 20 assuming the end position shown in broken lines in FIG. 3. The lowering of the front area of the seat 20 can be clearly seen.
  • the pivot levers 13 are designed as armrests or armrests and can carry upholstery.
  • the shape above the seat 20 can be designed freely if the rotary bearing of the seat 20 and the fixed attachment of the backrest 25 to the pivot levers 13 and the pivot bearing of the pivot lever 13 on the support arms 11 of the chair frame are maintained.
  • the dimensioning of the driving lever 17 and its articulation on the seat 20 and the support arms 11 depends on the amount of the desired lowering of the front region of the seat 20 and the amount of the desired displacement of the seat 20 in the direction of the backrest 25.
  • the arrangement of the adjusting device comprising the pivoting lever 13 and the carrying lever 17 is identical on both sides of the seat 20.
  • the backrest 25 When the seat 20 is lowered, the backrest 25 is simultaneously also adjusted downwards via the pivoting lever 13, the distance between the lower end of the backrest 25 and the rear end of the seat 20 becoming smaller.
  • This change in distance compensates for the length compensation member 24, which can be constructed in various ways.
  • Two telescopic parts, which on the backrest 25 and the Seat 20 attached and covered by a bellows can take over the compensation.
  • the same purpose is fulfilled by an elastic part which is designed in the manner of a bellows and is connected to the seat 20 and the backrest 25. A shapely transition can be achieved between the seat 20 and the backrest 25.

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  • Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Chairs For Special Purposes, Such As Reclining Chairs (AREA)
  • Chairs Characterized By Structure (AREA)
  • Plural Heterocyclic Compounds (AREA)

Abstract

The invention relates to a chair, in particular a work chair or office chair, having a seat (20), which is swivellable in the front region about a horizontal swivel axis (12) and which can be altered in inclination, and a backrest (25), which can be forcibly altered overproportionally in inclination by means of an adjusting device in dependence on the alteration of inclination of the seat, in which chair, with an increasing inclination of the seat, the backrest executes an additional relative movement downwards in relation to the facing end of the seat. A simple adjusting device having operationally reliable rotation and pivot bearings results from the fact that swivel levers (13) are linked to support arms (11) of the chair frame on both sides of the seat, the free ends of which swivel levers are mounted fixedly and non-rotationally on the backrest and support the backrest, and that the seat is mounted rotatably approximately in its central region on the swivel levers and is supported in the front region in an articulated manner on the chair frame via at least one carriage lever (17). <IMAGE>

Description

Die Erfindung betrifft einen Stuhl, insbesondere Arbeits- oder Bürostuhl, mit einem im vorderen Bereich um eine horizontale Schwenkachse schwenkbaren und in der Neigung veränderbaren Sitz und einem in Abhängigkeit von der Neigungsänderung des Sitzes mittels einer Verstelleinrichtung zwangsweise in der Neigung überproportional veränderbaren Rückenlehne, bei dem mit zunehmender Neigung des Sitzes die Rückenlehne gegenüber dem zugekehrten Ende des Sitzes eine zusätzliche Relativbewegung nach unten ausführt, bei dem an zur Vorderseite gerichteten Tragarmen des Stuhlgestelles Schwenkhebel angelenkt sind, deren freie Enden fest und unverdrehbar an der Rückenlehne angebracht sind und diese tragen, bei dem der Sitz an diesen Schwenkhebeln drehbar gelagert ist und sich im vorderen Bereich über mindestens einen Mitführhebel gelenkig an dem Stuhlgestell abstützt und bei dem die als Armlehnen oder Armstützen ausgebildeten Schwenkhebel zu beiden Seiten des Sitzes angeordnet sind.The invention relates to a chair, in particular a work or office chair, with a seat which can be pivoted in the front region about a horizontal pivot axis and whose inclination can be changed and, depending on the change in inclination of the seat, by means of an adjusting device, the inclination of the backrest which can be changed disproportionately, in which with increasing inclination of the seat, the backrest executes an additional relative movement downwards relative to the facing end of the seat, in which pivot levers are articulated on the support arms of the chair frame directed towards the front, the free ends of which are attached to the backrest in a fixed and non-rotatable manner and carry them, in which the seat is rotatably mounted on these swivel levers and is articulatedly supported on the chair frame in the front region via at least one entraining lever and in which the swivel levers designed as armrests or armrests are arranged on both sides of the seat.

Ein derartiger Stuhl ist aus dem DE-U-86 16 836 bekannt. Die bekannten Stühle dieser Art bieten einen ausgezeichneten Sitzkomfort, da sie einerseits in der Ausgangs- oder Arbeitsstellung dank der praktisch senkrechten Stellung der Rückenlehne ein eindeutiges Abstützen des Rückens des Benützers erbringen, andererseits aber nach dem Rückwärtsneigen der Rückenlehne ein entspanntess Sitzen ermöglichen. Beim Rückwärtsneigen der Rückenlehne macht der Oberkörper des Benutzers nicht einfach eine Schwenkbewegung, sondern es ergibt sich eine aus verschiedenen Bewegungskomponenten überlagerte Bewegung. Da die Rückenlehne beim Rückwärtsneigen eine zusätzliche Abwärtsbewegung in Richtung zum Sitz ausführt, wird eine Relativbewegung zwischen dem Rücken des Benutzers und der Rückenlehne vermieden oder zumindest auf eine nicht mehr bemerkbaren Wert reduziert.Such a chair is known from DE-U-86 16 836. The known chairs of this type offer excellent seating comfort, since on the one hand they provide a clear support for the back of the user in the starting or working position thanks to the practically vertical position of the backrest, but on the other hand they allow relaxed sitting after the backrest is tilted back. When the backrest is tilted backwards, the user's upper body does not simply make one Swiveling movement, but there is a movement superimposed from different movement components. Since the backrest executes an additional downward movement towards the seat when tilting backwards, a relative movement between the back of the user and the backrest is avoided or at least reduced to an undetectable value.

Da bei diesen bekannten Stühlen die Schwenkhebel im hinteren Bereich des Sitzes drehbar gelagert sind und die Schwenkhebel an der zentrischen Säule des Stuhlgestelles drehbar gelagert sind, liegen die Schwenkhebel zum größten Teil unterhalb des Sitzes und können nicht direkt als Armlehne oder Armstütze ausgebildet werden. Außerdem bringt der Mitführhebel in der gezeigten Anordnung beim Rückwärtsneigen des Rückenlehnenträgers kein Absinken der Vorderkante des Sitzes.Since in these known chairs the swivel levers are rotatably mounted in the rear area of the seat and the swivel levers are rotatably mounted on the central column of the chair frame, the swivel levers are for the most part below the seat and cannot be designed directly as an armrest or armrest. In addition, the driving lever in the arrangement shown does not cause the front edge of the seat to sink when the backrest support is tilted backwards.

Wie die EP-A-0 085 670 , die EP-A-0 176 816 und die DE-A-29 16 897 zeigen, kann diese Kompensation der Relativbewegung zwischen dem Körper des Benützers und der Rückenlehne an verschiedenartigen Stühlen auf konstruktiv unterschiedliche Arten gelöst werden. Der Stuhl kann als Synchronstuhl ausgebildet sein, bei dem ein Abwärtsneigen des den Sitz tragenden Sitzträgers zwangsweise ein Rückwärtsneigen des Rückenlehnenstabes mit größerem Neigungswinkel bewirkt. Der Sitzträger mit dem Sitz kann auch an dem Lagerbock ausziehbar geführt sein. Wie diese bekannten Stühle zeigen, ist zur Kompensation der Relativbewegung zwischen dem Körper des Benützers und der Rückenlehne, die beim Verändern der Neigung des Rückenlehnenstabes auftritt, stets eine aufwendige und komplizierte Verstelleinrichtung erforderlich, die nicht immer störungsfrei und betriebssicher arbeitet.As EP-A-0 085 670, EP-A-0 176 816 and DE-A-29 16 897 show, this compensation can Relative movement between the body of the user and the backrest on different types of chairs can be solved in structurally different ways. The chair can be designed as a synchronous chair, in which a downward inclination of the seat support carrying the seat inevitably brings about a backward inclination of the backrest bar with a larger angle of inclination. The seat support with the seat can also be guided to be extendable on the bearing block. As these known chairs show, to compensate for the relative movement between the body of the user and the backrest, which occurs when changing the inclination of the backrest bar, a complex and complex adjustment device is always required, which does not always work properly and reliably.

Dabei sind zum einen mehrgliedrige Hebelketten eingesetzt, wie die EP 0 176 816 A1 zeigt, oder zum anderen Übersetzungshebelpaare und Mitnehmerbögen wie die EP 0 085 870 A1 zeigt. In jedem Falle sind viele Teile für die Verstelleinrichtung erforderlich. Dasselbe gilt auch für einen Stuhl nach der DE 29 16 897 A1, bei der mit dem Herausziehen des Sitzes die Rückenlehne am Rückenlehnenstab in Richtung zum Sitz hin verschoben wird.On the one hand, multi-link lever chains are used, as shown in EP 0 176 816 A1, or, on the other hand, pairs of transmission levers and drive arches as shown in EP 0 085 870 A1. In any case, many parts are required for the adjustment device. The same also applies to a chair according to DE 29 16 897 A1, in which, when the seat is pulled out, the backrest on the backrest bar is displaced in the direction of the seat.

Ein weiterer Nachteil dieser bekannten Stühle besteht darin, daß die Schwenk- oder Drehlager der Verstelleinrichtung teilweise eine zusätzliche Verstellbewegung der gelenkig miteinander verbundenen Teile zulassen müssen. Der Aufbau dieser Lager ist daher meist kompliziert und nicht absolut betriebssicher.Another disadvantage of these known chairs is that the swivel or pivot bearings of the adjusting device must partially allow an additional adjustment movement of the articulated parts. The structure of these camps is therefore usually complicated and not absolutely reliable.

Es ist Aufgabe der Erfindung, einen Stuhl der eingangs erwähnten Art zu schaffen, der allein mit den Schwenkhebeln und dem Mitführhebel die Relativbewegung von Sitz und Rückenlehnenträger ermöglicht, dabei aber lediglich in der Verstelleinrichtung Drehgelenke erfordert und gleichzeitig Armlehnen oder Armstützen schafft.It is an object of the invention to provide a chair of the type mentioned, which allows the relative movement of the seat and backrest support alone with the pivot levers and the carrying lever, but only requires swivel joints in the adjustment device and at the same time creates armrests or armrests.

Diese Aufgabe wird nach der Erfindung dadurch gelöst, daß die Schwenkhebel zwischen der Anlenkachse an den Tragarmen und der festen Verbindungsstelle an der Rückenlehne nach unten ragende Lagerlaschen tragen, an denen der Sitz mit seinem mittleren Bereich drehbar gelagert ist.This object is achieved according to the invention in that the pivot levers between the articulation axis on the support arms and the fixed connection point on the backrest carry downwardly projecting bearing tabs on which the seat is rotatably supported with its central region.

Durch diese Anlenkung der Schwenkhebel mit den Lagerlaschen werden die Schwenkhebel zum überwiegenden Teil über dem Sitz liegen und können selbst die Funktion von Armlehnen oder Armstützen übernehmen. Mit dem Mitführhebel wird gleichzeitig ein Absenken der Sitzvorderkante erreicht, was gerade den Sitzkomfort bei zurückgeneigtem Rückenlehnenträger und vergrößerter Neigung des Sitzes verbessert. Die Schwenkhebel und der bzw. die Mitführhebel erfordern nur robuste Drehgelenke, die betriebssicher arbeiten.Due to this articulation of the swivel levers with the mounting brackets, the swivel levers will for the most part lie above the seat and can even take over the function of armrests or armrests. The guide lever also lowers the front edge of the seat, which improves seating comfort when the backrest support is tilted back and the seat angle is increased. The swivel levers and the entraining lever (s) only require robust swivel joints that work reliably.

Um die Schwenkhebel praktisch über die gesamte Sitztiefe als Armlehnen oder Armstützen ausnützen zu können, sieht eine weitere Ausgestaltung vor, daß die Schwenkhebel im Bereich der Anlenkachse nach unten abgewinkelt sind und annähernd parallel zu den Lagerlaschen für den Sitz verlaufen.In order to be able to use the swivel levers practically over the entire seat depth as armrests or armrests, a further embodiment provides that the swivel levers in Area of the articulation axis are angled downwards and run approximately parallel to the bearing brackets for the seat.

Um einen ausreichenden Schwenkbereich für die Mitführhebel zu erhalten, sieht eine Ausgestaltung vor, daß die Drehachse des bzw. der Mitführhebel an den Tragarmen dem vorderen Ende des Sitzes zugekehrt vor der Anlenkachse der Schwenkhebel angeordnet ist.In order to obtain a sufficient swivel range for the entraining lever, one embodiment provides that the axis of rotation of the entraining lever or arms on the support arms is arranged facing the front end of the seat in front of the articulation axis of the swivel lever.

Aus ästhetischen Gesichtspunkten kann zudem vorgesehen sein, daß das untere Ende der Rückenlehne über ein Längenausgleichsglied mit dem hinteren Bereich des Sitzes verbunden ist. Rückenlehne und Sitz bilden dann optisch eine Einheit.From an aesthetic point of view, it can also be provided that the lower end of the backrest is connected to the rear region of the seat via a length compensation member. The backrest and seat then form a single unit.

Der formschöne Übergang von dem Sitz zur Rückenlehne wird dabei dadurch noch verbessert, daß der Sitz am hinteren Ende eine nach oben gerichtete Verlängerung aufweist, die über das Längenausgleichsglied vorzugsweise formschlüssig mit dem unteren Ende der Rückenlehne verbunden ist.The shapely transition from the seat to the backrest is further improved in that the seat has an upward extension at the rear end, the is preferably positively connected to the lower end of the backrest via the length compensation member.

Ist das Längenausgleichsglied aus zwei teleskopierbaren Teilen gebildet, dann sind die beiden Teile mit dem Sitz und der Rückenlehne verbunden und mittels eines Faltenbalges abgedeckt. Eine tragende Funktion braucht das Längenausgleichsglied nicht zu übernehmen, es deckt nur den sich ändernden Abstand zwischen dem hinteren Bereich des Sitzes und dem unteren Ende der Rückenlehne ab.If the length compensation member is formed from two telescopic parts, then the two parts are connected to the seat and the backrest and covered by means of a bellows. The length compensation element does not have to perform a load-bearing function, it only covers the changing distance between the rear area of the seat and the lower end of the backrest.

Das elastisch ausgebildete Längenausgleichsglied kann jedoch auch selbst als Faltenbalg ausgebildet sein.However, the elastically designed length compensation member can also itself be designed as a bellows.

Die Drehlagerung des Sitzes an den Schwenkhebeln ist nach der Erfindung so gelöst, daß die Schwenkhebel zwischen der Anlenkachse an den Tragarmen und der festen Verbindungsstelle an der Rückenlehne nach unten ragende Lagerlaschen tragen, an denen der Sitz drehbar gelagert ist. Dabei kann der Sitz ebenfalls Lagerlaschen für die Lagerbolzen aufweisen oder selbst die Lagerbolzen tragen.The pivot bearing of the seat on the pivot levers is solved according to the invention so that the pivot levers between the articulation axis on the support arms and the fixed connection point on the backrest carry downwardly projecting bearing tabs on which the seat is rotatably mounted. The seat can also have mounting brackets for the mounting bolts or even carry the mounting bolts.

Beim Absenken des Sitzes wird der Sitz in Richtung zur Rückenlehne verschoben, wenn die Ausgestaltung so ist, daß die Anlenkachse der Schwenkhebel unterhalb der horizontalen Schwenkachse des vorderen Bereiches des Sitzes angeordnet ist, und daß die Drehachse des bzw. der Mitführhebel an den Tragarmen dem vorderen Ende des Sitzes zugekehrt vor der Anlenkachse der Schwenkhebel angeordnet ist.When lowering the seat, the seat is moved in the direction of the backrest if the design is such that the pivot axis of the pivot lever is arranged below the horizontal pivot axis of the front region of the seat, and that the axis of rotation of the entraining lever or arms on the support arms is the front End of the seat facing the pivot axis of the pivot lever is arranged.

Die Erfindung wird anhand eines in den Zeichnungen dargestellten Ausführungsbeispiels näher erläutert. Es zeigt:

  • Fig. 1 schematisch in Seitenansicht den Stuhl mit der Verstelleinrichtung in der Ausgangsstellung,
  • Fig. 2 in vergrößertem Maßstab die Verstelleinrichtung und den Stuhl gemäß einer Ausgestaltung in derselben Seitenansicht und
  • Fig. 3 die andere Seitenansicht des Stuhles nach Fig. 2 bei abgesenktem Sitz und zurückgeneigter Rückenlehne.
The invention is explained in more detail using an exemplary embodiment shown in the drawings. It shows:
  • 1 shows a schematic side view of the chair with the adjusting device in the starting position,
  • Fig. 2 on an enlarged scale the adjustment device and the chair according to an embodiment in the same side view and
  • Fig. 3 shows the other side view of the chair of FIG. 2 with the seat lowered and the backrest reclined.

Die Fig. 1 zeigt schematisch, wie der Sitz 20 und die Rückenlehne 25 mit der Verstelleinrichtung verbunden sind und welche Teile die Verstelleinrichtung umfaßt. Die Säule 10 des Stuhlgestelles geht in zur Vorderseite des Stuhles gerichtete Tragarme 11 über. Am Ende der Tragarme 11 sind zu beiden Seiten des Sitzes 20 Schwenkhebel 13 angelenkt, wie die Anlenkachse 12 zeigt. Der Sitz 20 ist mit einem mittleren Bereich an Lagerlaschen 14 der Schwenkhebel 13 drehbar gelagert. Dabei kann der Sitz 20 Lagerlaschen 23 aufweisen, die die Lagerbolzen für die Drehachse 15 aufnehmen. Die freien Enden der Schwenkhebel 13 sind als feste unverdrehbare Verbindungsstelle 16 mit der Rückenlehne 25 verbunden. Der vordere Bereich des Sitzes 20 trägt Lagerlaschen 22 für die horizontale Schwenkachse 19. An den Lagerlaschen 22 sind vorzugsweise auch zu beiden Seiten des Sitzes 20 die Mitführhebel 17 schwenkbar gelagert, die sich über die Drehachsen 18 gelenkig an den Tragarmen 11 abstützen. Die Drehachsen 18 der Mitführhebel 17 liegen dem vorderen Ende des Sitzes 20 zugekehrt von der Anlenkachse 12 der Schwenkhebel 13. Das hintere Ende des Sitzes 20 geht in die nach oben gerichtete Verlängerung 21 über, die über das Längenausgleichsglied 24 mit dem unteren Ende der Rückenlehne 25 in Verbindung steht. Dieses Längenausgleichsglied 24 hat keine tragende Funktion, es deckt lediglich den sich ändernden Abstand zwischen der Verlängerung 21 des Sitzes 20 und dem unteren Ende der Rückenlehne 25 formschön ab.Fig. 1 shows schematically how the seat 20 and the backrest 25 are connected to the adjusting device and which parts the adjusting device comprises. The column 10 of the chair frame merges into support arms 11 directed towards the front of the chair. At the end of the support arms 11 20 pivot levers 13 are articulated on both sides of the seat, as the articulation axis 12 shows. The seat 20 is rotatably supported with a central area on bearing tabs 14 of the pivot lever 13. In this case, the seat 20 can have bearing brackets 23 which receive the bearing bolts for the axis of rotation 15. The free ends of the pivot levers 13 are connected to the backrest 25 as a fixed, non-rotatable connection point 16. The front area of the seat 20 carries bearing brackets 22 for the horizontal pivot axis 19. The carrying levers 17 are preferably also pivotably mounted on the bearing brackets 22 on both sides of the seat 20, and are supported in an articulated manner on the support arms 11 via the axes of rotation 18. The axes of rotation 18 of the entraining lever 17 face the front end of the seat 20 and the pivot axis 13 of the pivot lever 13. The rear end of the seat 20 goes into the upward extension 21, which is connected to the lower end of the backrest 25 via the length compensation member 24. This length compensation member 24 has no load-bearing function, it merely covers the changing distance between the extension 21 of the seat 20 and the lower end of the backrest 25 in an elegant manner.

Wird der Sitz 20 in Richtung 26 nach unten verstellt, dann werden die Schwenkhebel 13 in Richtung 27 mit verstellt. Dabei wird der Schwenkwinkel der Schwenkhebel 13 vergrößert, bedingt durch den Abstand der Drehachsen 15 von den Anlenkachsen 12. Die Mitführhebel 17 führen eine gleichgerichtete Schwenkbewegung aus, so daß der Sitz 20 neben einer Absenkung im vorderen Bereich auch noch eine Verschiebung in Richtung zur Rückenlehne 25 erfährt. Die Rückenlehne 25 führt die Neigungsbewegung 28 aus, die größer ist als die Neigungsbewegung des Sitzes 20. Da die Verbindungsstelle 16 starr ist, wird die Rückenlehne 25 zwangsweise in Richtung 29 verstellt. Das Längenausgleichsglied 24 läßt diese Bewegung zu. Damit wird erreicht, daß mit zunehmender Neigung der Rückenlehne 25 eine Absenkbewegung 29 der Rückenlehne 25 in Richtung zum Sitz 20 ausgeführt wird. Das Längenausgleichsglied 24 übernimmt die Anpassung des sich ändernden Abstandes zwischen dem unteren Ende der Rückenlehne 25 und der Verlängerung 21 des Sitzes 20.If the seat 20 is adjusted downwards in the direction 26, then the pivot levers 13 are also adjusted in the direction 27. The swivel angle of the swivel levers 13 is increased due to the distance between the axes of rotation 15 and the articulation axes 12. The entraining levers 17 perform a swiveling movement in the same direction, so that the seat 20, in addition to a lowering in the front region, also a displacement in the direction of the backrest 25 experiences. The backrest 25 executes the inclination movement 28, which is greater than the inclination movement of the seat 20. Since the connection point 16 is rigid, the backrest 25 is forcibly adjusted in the direction 29. The length compensation member 24 allows this movement. This ensures that a lowering movement 29 of the backrest 25 in the direction of the seat 20 is carried out with increasing inclination of the backrest 25. The length compensation member 24 takes on the adaptation of the changing distance between the lower end of the backrest 25 and the extension 21 of the seat 20th

Fig. 2 zeigt in vergrößertem Maßstab ein Ausführungsbeispiel eines Stuhles. Zu beiden Seiten des Sitzes 20 ist ein Schwenkhebel 13 und ein Mitführhebel 17 angeordnet. Von der nicht dargestellten Säule des Stuhlgestelles gehen zwei Tragarme 11 aus, die sich bis zum vorderen Bereich des Sitzes 20 erstrecken. Der Sitz 20 kann aus Sitzträger und Sitzpolster zusammengesetzt sein. Die Schwenkhebel 13 gehen von der Anlenkachse 12 zunächst mit einem abgewinkelten Abschnitt nach oben und erstrecken sich dann geneigt bis in den unteren Bereich der Rückenlehne 25, die ebenfalls aus einem Rückenlehnenträger und einem Rückenlehnenpolster zusammengesetzt sein kann. Die Enden der Schwenkhebel 13 sind fest und unverdrehbar mit der Rückenlehne 25 verbunden, wie die Verbindungsstelle 16 zeigt. An den Schwenkhebeln 13 sind im vorderen Bereich nach unten gerichtete Lagerlaschen 14 angebracht, die annähernd parallel zu den abgewinkelten Endabschnitten der Schwenkhebel 13 verlaufen. An den Lagerlaschen 14 ist etwa der mittlere Bereich des Sitzes 20 drehbar gelagert, wie die Drehachse 15 zeigt. Im vorderen Bereich des Sitzes 20 sind weitere Lagerlaschen angebracht, an denen die Mitführhebel 17 um die horizontale Schwenkachse 19 schwenkbar gelagert sind. Die Mitführhebel 17 stützen sich über die Drehachsen 18 an den Tragarmen 11 gelenkig ab. Dabei liegt in der Ausgangsstellung die Schwenkachse 19 des Mitführhebels 17 und damit die horizontale Schwenkachse des Sitzes 20 über der Anlenkachse 12 der Schwenkhebel 13. Die Drehachsen 18 der Mitführhebel 17 liegen dem vorderen Ende des Sitzes 20 zugekehrt vor der Anlenkachse 12 der Schwenkhebel 13. Mit dem Abstand der Drehachsen 15 von den Anlenkachsen 12 wird das Maß der Vergrößerung des Neigungswinkels der Rückenlehne 25 beim Absenken des Sitzes 20 festgelegt. Beim Absenken des Sitzes 20 werden über die Lagerlaschen 14 die Schwenkhebel 13 in gleicher Schwenkrichtung mit verstellt, wobei der Schwenkwinkel der Schwenkhebel 13 entsprechend größer ist als der Schwenkwinkel des Sitzes 20.Fig. 2 shows an embodiment of a chair on an enlarged scale. A swivel lever 13 and an entraining lever 17 are arranged on both sides of the seat 20. Two support arms 11 extend from the column of the chair frame, not shown, which extend to the front region of the seat 20. The seat 20 can consist of a seat support and seat cushion be composed. The pivot levers 13 initially go upward from the articulation axis 12 with an angled section and then extend inclinedly into the lower region of the backrest 25, which can also be composed of a backrest support and a backrest cushion. The ends of the pivot levers 13 are fixed and non-rotatably connected to the backrest 25, as the connection point 16 shows. On the swivel levers 13, downward-facing bearing brackets 14 are attached in the front area and run approximately parallel to the angled end sections of the swivel levers 13. About the middle region of the seat 20 is rotatably mounted on the bearing brackets 14, as the axis of rotation 15 shows. In the front area of the seat 20, further mounting brackets are attached, on which the entraining levers 17 are mounted so as to be pivotable about the horizontal pivot axis 19. The driving levers 17 are articulated on the support arms 11 via the axes of rotation 18. In the starting position, the pivot axis 19 of the driving lever 17 and thus the horizontal pivot axis of the seat 20 lie above the pivot axis 12 of the pivot lever 13. The axes of rotation 18 of the pivot lever 17 face the front end of the seat 20 in front of the pivot axis 12 of the pivot lever 13. With the distance of the axes of rotation 15 from the articulation axes 12 is the measure of the increase in the angle of inclination of the backrest 25 when the seat 20 is lowered. When the seat 20 is lowered, the swivel levers 13 are also adjusted in the same swivel direction via the mounting brackets 14, the swivel angle of the swivel lever 13 being correspondingly greater than the swivel angle of the seat 20.

Wie die Ansicht nach Fig. 3 zeigt, werden dabei die Mitführhebel 17 in Richtung zur Rückenlehne 25 mit verschwenkt. Dies führt zum Absenken des vorderen Bereiches des Sitzes 20, verbunden mit einer Verschiebung des Sitzes 20 in Richtung zur Rückenlehne 25, was den Sitzkomfort des Stuhles auch bei abgesenktem Sitz 20 verbessert. Die Rückenlehne 25 kann bis zu einer mit 25′ gekennzeichneten Endstellung verstellt werden, wobei der Sitz 20 die in Fig. 3 gestrichelt eingezeichnete Endstellung einnimmt. Dabei ist deutlich die Absenkung des vorderen Bereiches des Sitzes 20 zu erkennen.As the view according to FIG. 3 shows, the driving levers 17 are also pivoted in the direction of the backrest 25. This leads to the lowering of the front area of the seat 20, connected with a displacement of the seat 20 in the direction of the backrest 25, which improves the seating comfort of the chair even when the seat 20 is lowered. The backrest 25 can be adjusted up to a 25 'marked end position, the seat 20 assuming the end position shown in broken lines in FIG. 3. The lowering of the front area of the seat 20 can be clearly seen.

Die Schwenkhebel 13 werden als Armlehnen oder Armstützen ausgebildet und können eine Polsterung tragen. Dabei kann die Form über dem Sitz 20 frei gestaltet werden, wenn die Drehlagerung des Sitzes 20 und die feste Anbringung der Rückenlehne 25 an den Schwenkhebeln 13 sowie die Schwenklagerung der Schwenkhebel 13 an den Tragarmen 11 des Stuhlgestelles beibehalten werden. Die Dimensionierung der Mitführhebel 17 und ihre Anlenkung an dem Sitz 20 und den Tragarmen 11 richtet sich nach dem Betrag der gewünschten Absenkung des vorderen Bereiches des Sitzes 20 und dem Betrag der gewünschten Verschiebung des Sitzes 20 in Richtung zur Rückenlehne 25.The pivot levers 13 are designed as armrests or armrests and can carry upholstery. The shape above the seat 20 can be designed freely if the rotary bearing of the seat 20 and the fixed attachment of the backrest 25 to the pivot levers 13 and the pivot bearing of the pivot lever 13 on the support arms 11 of the chair frame are maintained. The dimensioning of the driving lever 17 and its articulation on the seat 20 and the support arms 11 depends on the amount of the desired lowering of the front region of the seat 20 and the amount of the desired displacement of the seat 20 in the direction of the backrest 25.

Wie die Seitenansichten nach Fig. 2 und 3 erkennen lassen, ist die Anordnung der Verstelleinrichtung aus Schwenkhebel 13 und Mitführhebel 17 auf beiden Seiten des Sitzes 20 identisch.As can be seen from the side views according to FIGS. 2 and 3, the arrangement of the adjusting device comprising the pivoting lever 13 and the carrying lever 17 is identical on both sides of the seat 20.

Beim Absenken des Sitzes 20 wird die Rückenlehne 25 über die Schwenkhebel 13 gleichzeitig auch nach unten verstellt, wobei der Abstand des unteren Endes der Rückenlehne 25 zum hinteren Ende des Sitzes 20 kleiner wird. Diese Abstandsänderung gleicht das Längenausgleichsglied 24 aus, das auf verschiedene Art aufgebaut sein kann. Zwei teleskopierbare Teile, die an der Rückenlehne 25 und dem Sitz 20 befestigt und mittels eines Faltenbalges abgedeckt sind, können den Ausgleich übernehmen. Denselben Zweck erfüllt ein elastisches Teil, das selbst nach Art eines Faltenbalges ausgelegt und mit dem Sitz 20 und der Rückenlehne 25 verbunden ist. Dabei läßt sich ein formschöner Übergang zwischen dem Sitz 20 und der Rückenlehne 25 erreichen.When the seat 20 is lowered, the backrest 25 is simultaneously also adjusted downwards via the pivoting lever 13, the distance between the lower end of the backrest 25 and the rear end of the seat 20 becoming smaller. This change in distance compensates for the length compensation member 24, which can be constructed in various ways. Two telescopic parts, which on the backrest 25 and the Seat 20 attached and covered by a bellows can take over the compensation. The same purpose is fulfilled by an elastic part which is designed in the manner of a bellows and is connected to the seat 20 and the backrest 25. A shapely transition can be achieved between the seat 20 and the backrest 25.

Claims (8)

1. A chair, in particular a work or office chair, comprising a seat which is pivotable in the front region about a horizontal pivot axis and which is variable in its inclination, and a backrest (25) which is necessarily over-proportionally variable in inclination by means of an adjusting device in dependence on the change in inclination of the seat (20), wherein with increasing inclination of the seat (20) the backrest (25) performs an additional relative movement downwardly with respect to the adjacent end of the seat (20), wherein pivot levers (13) are pivotally mounted to support arms (11) of the chair frame, which are directed towards the front side, the free ends of which pivot levers (13) are fixedly and non-rotatably mounted to the backrest (25) and carry same, wherein the seat (20) is rotatably mounted at said pivot levers (13) and in the front region is supported pivotably on the seat frame by way of at least one entrainment lever (17), and wherein the pivot levers (13) which are formed as arm rests or arm supports are arranged at both sides of the seat (20), characterised in that between the pivot mounting axis (12) to the support arms (11) and the fixed connection (16) to the backrest (25) the pivot levers (13) carry downwardly projecting mounting bars (14) at which the seat (20) is rotatably mounted with its middle region.
2. A chair according to claim 1 characterised in that the pivot levers (13) are angled downwardly in the region of the pivot mounting axis (12) and extend approximately parallel to the mounting bars (14) for the seat (20).
3. A chair according to claim 1 or claim 2 characterised in that the pivot mounting axis (12) of the pivot levers (13) is arranged beneath the horizontal pivot axis (19) of the front region of the seat (20).
4. A chair according to one of claims 1 to 3 characterised in that the axis of rotation (18) of the entrainment lever or levers (17) is arranged on the support arms (11) towards the front end of the seat (20) in front of the pivot mounting axis (12) of the pivot levers (13).
5. A chair according to one of claims 1 to 4 characterised in that the lower end of the backrest (25) is connected to the rear region of the seat (20) by way of a length compensating member (24).
6. A chair according to claim 5 characterised in that at the rear end the seat (20) has an upwardly directed extension (21) which is preferably positively connected by way of the length compensating member (24) to the lower end of the backrest (25).
7. A chair according to claim 5 characterised in that the length compensating member (24) comprises two telescopic members which are connected to the seat (20) and the backrest (25) and are covered by means of a bellows member.
8. A chair according to claim 5 characterised in that the length compensating member (24) is itself of an elastic nature and is in the form of a bellows member.
EP89108563A 1988-05-26 1989-05-12 Chair, in particular a work or office chair Expired - Lifetime EP0343450B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89108563T ATE75114T1 (en) 1988-05-26 1989-05-12 CHAIR, ESPECIALLY WORK OR OFFICE CHAIR.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3817761 1988-05-26
DE3817761A DE3817761A1 (en) 1988-05-19 1988-05-26 Chair, in particular work or office chair

Publications (2)

Publication Number Publication Date
EP0343450A1 EP0343450A1 (en) 1989-11-29
EP0343450B1 true EP0343450B1 (en) 1992-04-22

Family

ID=6355087

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89108563A Expired - Lifetime EP0343450B1 (en) 1988-05-26 1989-05-12 Chair, in particular a work or office chair

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US (1) US5071189A (en)
EP (1) EP0343450B1 (en)
JP (1) JPH02191410A (en)
AT (1) ATE75114T1 (en)
CA (1) CA1320676C (en)
DE (2) DE3817761A1 (en)
ES (1) ES2032626T3 (en)

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Also Published As

Publication number Publication date
DE58901223D1 (en) 1992-05-27
ES2032626T3 (en) 1993-02-16
ATE75114T1 (en) 1992-05-15
DE3817761A1 (en) 1989-11-30
EP0343450A1 (en) 1989-11-29
DE3817761C2 (en) 1990-05-10
US5071189A (en) 1991-12-10
JPH02191410A (en) 1990-07-27
CA1320676C (en) 1993-07-27

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