EP0688522A1 - Chair, particularly office-chair - Google Patents

Chair, particularly office-chair Download PDF

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Publication number
EP0688522A1
EP0688522A1 EP95108361A EP95108361A EP0688522A1 EP 0688522 A1 EP0688522 A1 EP 0688522A1 EP 95108361 A EP95108361 A EP 95108361A EP 95108361 A EP95108361 A EP 95108361A EP 0688522 A1 EP0688522 A1 EP 0688522A1
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EP
European Patent Office
Prior art keywords
seat
spring element
chair
chair according
axis
Prior art date
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.)
Withdrawn
Application number
EP95108361A
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German (de)
French (fr)
Inventor
Oliver Hirschoff
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wilhelm Link & Co KG Stahlrohrmobel GmbH
Original Assignee
Wilhelm Link & Co KG Stahlrohrmobel GmbH
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Publication date
Application filed by Wilhelm Link & Co KG Stahlrohrmobel GmbH filed Critical Wilhelm Link & Co KG Stahlrohrmobel GmbH
Publication of EP0688522A1 publication Critical patent/EP0688522A1/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • A47C1/03261—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means
    • A47C1/03288—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with resilient blocks
    • 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
    • A47C1/03205—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest having adjustable and lockable inclination
    • A47C1/03216—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest having adjustable and lockable inclination by fluid means
    • 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 an office chair, with a seat support, a seat pivotally mounted thereon about a horizontal axis and an elastic spring element between the seat and the seat support.
  • the lever arm on which the spring acts can also be changed.
  • this adjustment is usually also achieved using a handwheel, so that several turns of this handwheel are also necessary in order to adapt the restoring force to the body weight of the user of the chair.
  • the object of the invention is to design a chair of the type mentioned in such a way that the restoring force of the spring element can be varied over a wide range with small actuating forces and small actuating paths.
  • the spring element can either have a different radial extension to the axis, or the spring element can have different suspension properties around the axis.
  • the spring element by rotating the spring element about the substantially vertical axis, a large proportion of the spring element is arranged close to the horizontal axis, about which the seat is pivotably mounted. As a result, only a small proportion of its volume is compressed when the seat is inclined, with the result that only a small restoring force is exerted on the seat. If, on the other hand, the spring element is rotated in such a way that its larger portion is located in a region distant from the horizontal axis, the largest part of the spring element is compressed when the seat is inclined and a relatively high restoring force is thus exerted on the seat.
  • the force exerted by the spring element on the seat can be varied by the spatial distribution of the mass or volume of the spring element below the seat.
  • the part of the spring element with the harder suspension properties can be pushed into the region near the horizontal axis by rotating the spring element about the substantially vertical axis in order to set a high restoring force, or the spring element can be rotated so that its area with the softer suspension properties comes to lie close to the horizontal axis, so that the spring element exerts only a slight force on the seat.
  • the spring element is particularly useful in the first case to manufacture the spring element from a spring block made of cellularly foamed polyurethane with a high density.
  • This material which is similar in structure to a foam, offers very good suspension properties. It can be compressed up to 60% of the original height and generates very high forces that cannot be achieved by any metallic spring with comparable installation dimensions. There is also a progressive force curve, ie at the end of the spring travel the force increases disproportionately. This effect is perceived as pleasant on the chair and is expressly desired.
  • other elastomers can also be used as a spring block.
  • the restoring force is usually adjusted when the seat is tilted forward.
  • the upper side of the spring element can have a truncated cone-like extension on the vertical axis, which engages in a corresponding concave recess on the seat. This increase is under slight pressure even at the foremost seat angle and thus holds the spring element in position.
  • the transition surfaces between the truncated cone of the spring element and the seat surface should be rounded, so that a uniform increase in the force is felt when tilting back.
  • the design of the spring element with a truncated cone-like elevation on its upper side also has the advantage that at front seat inclination angles only those areas of the spring element that are close to the vertical axis of rotation of the spring element are under pressure. Only there is a frictional force generated between the spring element and the seat by the pressure of the seat on the spring element. This friction therefore only requires a small torque to overcome the vertical axis of rotation of the spring element. This braking torque is adjusted so that the spring element can be easily turned on the one hand, but on the other hand is not independently adjusted by vibrations or movements.
  • a stepless locking of the chair at any angle can be achieved by an additional locking element, which can also be a gas spring, for example.
  • the chair additionally has a backrest which can be adjusted by an inclination and which is firmly connected to a backrest support, the backrest support having a backrest holder and an extension arranged at an angle to the backrest holder, the upper end of which is articulated to the seat and the lower end of which is connected to one Handlebar is articulated, which is articulated to the seat support.
  • the handlebar can be connected to a substantially downward-pointing lever, which is connected via the locking element to the horizontal axis, about which the seat is pivotally mounted.
  • a locking element is preferably to be arranged laterally next to the spring element below the seat.
  • Fig. 1 shows a schematic representation of an office chair 10 with a seat bracket 11, a seat 12 and a backrest 13.
  • the seat bracket 11 is fixed at an obtuse angle so firmly on a chair column 14 that it points to the front edge of the seat 12.
  • the chair column 14 is arranged on a base frame 16 mounted on rollers 15.
  • a bore 18 is provided in the seat support 11, in which a vertical axis 19 is rotatably mounted. At the upper end of this vertical axis 19, a horizontal turntable 20 is attached, which rests on a horizontal surface 21 of the seat support 11. On this turntable 20, an elastic spring element 22 is fastened, which together with the turntable 20 can be rotated about the axis 19.
  • This spring element 22 consists of a cellularly foamed polyurethane with a high density.
  • FIGS. 2 and 3 show the shape and position of the spring element 22 which is arranged on the turntable 20, which in turn rests on the horizontal plate 21 of the seat support 11.
  • the turntable 20 can be rotated by means of a lever 23 via the axis 19, which passes through a bore 18 in the seat support 11.
  • This spring element can, as shown in Fig. 2 and in Fig. 3 with solid lines, be set so that the extension 22.2 of the spring element 22 lies between the vertical axis 19 and the horizontal axis 17. In this position, in which the largest part of the spring element is located near the pivot axis 17 of the seat 12, only a small proportion of the volume of the spring element 22 is compressed when the seat 12 is tilted. The force exerted by the spring element 22 on the seat 12 is therefore low in this position.
  • the spring element 22 can, however, in the direction of arrow 26, i.e. H. in the top view counterclockwise, a quarter turn to bring the extension 22.2 of the spring element 22 in a position away from the horizontal axis 17. In this position, the largest part of the spring element 22 is now at a significant distance from the pivot axis 17 of the seat 12, so that an inclination of the seat 12 results in a strong compression of the spring element 22 and thus a very high restoring force.
  • the spring element by turning the spring element about the axis 19 by means of the lever 23, the restoring force exerted by the spring element 22 on the seat 12 can be continuously adjusted.
  • FIG. 4 clearly shows once again the assembly of seat 12, spring element 22 and seat support 11.
  • Seat 12 is mounted with its recess 25 on the frustoconical elevation 24 of spring element 22.
  • the spring element 22 in turn lies on a plate 20 which can be rotated together with the axis 19 by the lever 23.

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  • Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Chairs Characterized By Structure (AREA)

Abstract

The chair has a spring element (22) which is rotatably positioned on a vertical axle (19), and, when turned, the distribution of force exerted on the seat surface (12) by the spring element can be locally varied. The spring element has a variable radial expansion in relation to the axle. The spring element is partly made of cellular foam polyurethane, and has an extension parallel to the seat and continuously rotatable by roughly 90 deg.. The top of the spring element has a truncated cone shaped protuberance (24) as an extension to the vertical axle and fitting into a matching concave hole (25) in the seat. A locking element (31) fixes the seat in any angle of tilt. <IMAGE>

Description

Die Erfindung betrifft einen Stuhl, insbesondere einen Bürostuhl, mit einem Sitzträger, einem darauf um eine horizontale Achse verschwenkbar gelagerten Sitz und einem elastischen Federelement zwischen dem Sitz und dem Sitzträger.The invention relates to a chair, in particular an office chair, with a seat support, a seat pivotally mounted thereon about a horizontal axis and an elastic spring element between the seat and the seat support.

Wenn sich eine Person auf einen derartigen Stuhl setzt, kann sie mit ihrem Körpergewicht den Sitz um die horizontale Achse schwenken, und häufig ist mit der Neigung des Sitzes über eine Mechanik auch eine Neigung einer Rückenlehne verbunden. Ein Federelement zwischen dem Sitz und dem Sitzträger bewirkt eine Rückstellung des Sitzes und gegebenenfalls auch der Rückenlehne, wenn der Sitz entlastet ist.When a person sits on such a chair, he can swing the seat about the horizontal axis with his body weight, and often the inclination of the seat is also connected to an inclination of a backrest via a mechanism. A spring element between the seat and the seat support causes the seat and possibly also the backrest to be reset when the seat is relieved.

Um den Stuhl an die unterschiedlichen Körpergewichte von verschiedenen Personen anzupassen, ist es erforderlich, die Rückstellkraft dieser Feder einstellen zu können. Bei herkömmlichen Stühlen wird dazu gewöhnlich die Vorspannung einer Feder beispielsweise durch das Betätigen eines Handrades verändert. Mit diesem Handrad muß aber die Vorspannung der Feder überwunden werden, so daß entweder sehr viele Umdrehungen am Handrad nötig sind, um eine spürbare Änderung zu erreichen, oder sehr hohe Kräfte am Stellrad erforderlich sind.In order to adapt the chair to the different body weights of different people, it is necessary to be able to adjust the restoring force of this spring. In conventional chairs, the preload of a spring is usually changed, for example, by operating a handwheel. With this handwheel, however, the pretension of the spring must be overcome, so that either a very large number of revolutions on the handwheel are necessary to achieve a noticeable change, or very high forces on the adjusting wheel are required.

Ein Verstellen der Vorspannung des Feder mittels eines Handrades ist daher sehr unkomfortabel.Adjusting the spring preload using a handwheel is therefore very uncomfortable.

Anstatt die Vorspannung einer Feder zu ändern, kann auch der Hebelarm, auf den die Feder wirkt, verändert werden. In der Praxis wird diese Verstellung jedoch meist auch über ein Handrad erreicht, so daß ebenfalls mehrere Umdrehungen an diesem Handrad nötig sind, um die Rückstellkraft an das Körpergewicht des Benutzers des Stuhles anzupassen.Instead of changing the preload of a spring, the lever arm on which the spring acts can also be changed. In practice, however, this adjustment is usually also achieved using a handwheel, so that several turns of this handwheel are also necessary in order to adapt the restoring force to the body weight of the user of the chair.

Die Aufgabe der Erfindung besteht darin, einen Stuhl der eingangs genannten Art so auszubilden, daß mit geringen Stellkräften und kleinen Stellwegen die Rückstellkraft des Federelementes in einem großen Spektrum variiert werden kann.The object of the invention is to design a chair of the type mentioned in such a way that the restoring force of the spring element can be varied over a wide range with small actuating forces and small actuating paths.

Diese Aufgabe wird mit einem Stuhl der eingangs genannten Art dadurch gelöst, daß das Federelement um eine im wesentlichen senkrechte Achse drehbar angeordnet ist und so ausgebildet ist, daß durch ein Drehen des Federelementes die örtliche Verteilung der vom Federelement auf die Sitzfläche ausgeübten Kraft variierbar ist.This object is achieved with a chair of the type mentioned in that the spring element is rotatably arranged about an essentially vertical axis and is designed such that the local distribution of the force exerted by the spring element on the seat surface can be varied by rotating the spring element.

Die Erfindung hat den Vorteil, daß durch ein Drehen des Federelementes mittels eines angesetzten Hebels um beispielsweise 50 - 90° ein Anpassen der Rückstellkraft der Feder an Personen mit einem Körpergewicht von 50 - 110 kg erreicht werden kann. Bei entlasteter Sitzfläche kann das Federelement leicht um einen bestimmten Winkel verstellt werden, ohne daß größere Stellkräfte überwunden werden müssen. Die erfindungsgemäße Verstellmechanik ist daher weit komfortabler als alle vorbekannten Einrichtungen zur Verstellung der Rückstellkraft.The invention has the advantage that, by rotating the spring element by means of an attached lever by, for example, 50-90 °, the restoring force of the spring can be adapted to people with a body weight of 50-110 kg. When the seat is relieved, the spring element can easily be adjusted by a certain angle without having to overcome larger actuating forces. The adjustment mechanism according to the invention is therefore far more comfortable than all previously known devices for adjusting the restoring force.

Um durch Drehen des Federelementes die örtliche Verteilung der vom Federelement auf die Sitzfläche ausgeübten Kraft zu variieren, kann das Federelement entweder eine unterschiedliche radiale Ausdehnung zur Achse aufweisen, oder das Federelement kann um die Achse herum unterschiedliche Federungseigenschaften aufweisen.In order to vary the local distribution of the force exerted by the spring element on the seat surface by rotating the spring element, the spring element can either have a different radial extension to the axis, or the spring element can have different suspension properties around the axis.

Im ersteren Fall wird durch Drehen des Federelementes um die im wesentlichen senkrechte Achse ein großer Anteil des Federelementes nahe der horizontalen Achse, um die der Sitz verschwenkbar gelagert ist, angeordnet. Dadurch wird bei einer Neigung des Sitzes nur ein kleiner Anteil seines Volumens zusammengedrückt, was zur Folge hat, daß nur eine kleine Rückstellkraft auf den Sitz ausgeübt wird. Wird das Federelement hingegen so gedreht, daß sein größerer Anteil sich in einem von der horizontalen Achse entfernten Gebiet befindet, wird bei einer Neigung des Sitzes der größte Teil des Federelementes komprimiert und somit eine relativ hohe Rückstellkraft auf den Sitz ausgeübt. So kann durch die räumliche Verteilung der Masse oder des Volumens des Federelementes unterhalb des Sitzes die vom Federelement auf den Sitz ausgeübte Kraft variiert werden.In the former case, by rotating the spring element about the substantially vertical axis, a large proportion of the spring element is arranged close to the horizontal axis, about which the seat is pivotably mounted. As a result, only a small proportion of its volume is compressed when the seat is inclined, with the result that only a small restoring force is exerted on the seat. If, on the other hand, the spring element is rotated in such a way that its larger portion is located in a region distant from the horizontal axis, the largest part of the spring element is compressed when the seat is inclined and a relatively high restoring force is thus exerted on the seat. For example, the force exerted by the spring element on the seat can be varied by the spatial distribution of the mass or volume of the spring element below the seat.

Wenn das Federelement in gleichmäßigem Abstand um die Achse herum unterschiedliche Federungseigenschaften aufweist, kann durch Drehen des Federelementes um die im wesentlichen senkrechte Achse der Teil des Federelementes mit den härteren Federungseigenschaften in den Bereich nahe der horizontalen Achse geschoben werden, um eine hohe Rückstellkraft einzustellen, oder das Federelement kann so gedreht werden, daß sein Bereich mit den weicheren Federungseigenschaften nahe der horizontalen Achse zu liegen kommt, so daß das Federelement nur eine geringe Kraft auf den Sitz ausübt.If the spring element has different suspension properties at a uniform distance around the axis, the part of the spring element with the harder suspension properties can be pushed into the region near the horizontal axis by rotating the spring element about the substantially vertical axis in order to set a high restoring force, or the spring element can be rotated so that its area with the softer suspension properties comes to lie close to the horizontal axis, so that the spring element exerts only a slight force on the seat.

Zweckmäßig ist es vor allem im ersten Fall, das Federelement aus einem Federblock aus zellig geschäumtem Polyurethan mit einem hohen Raumgewicht herzustellen. Dieses Material, das in seiner Struktur ähnlich ist wie ein Schaumstoff, bietet sehr gute Federungseigenschaften. Es läßt sich bis zu 60 % der ursprünglichen Höhe zusammendrücken und erzeugt sehr hohe Kräfte, die von keiner metallischen Feder mit vergleichbaren Einbaumaßen erreicht werden können. Außerdem entsteht ein progressiver Kraftverlauf, d. h. zum Ende des Federweges steigt die Kraft überproportional an. Dieser Effekt wird am Stuhl als angenehm empfunden und ist ausdrücklich erwünscht. Neben der Verwendung von zellig geschäumtem Polyurethan sind aber auch andere Elastomere als Federblock einsetzbar.It is particularly useful in the first case to manufacture the spring element from a spring block made of cellularly foamed polyurethane with a high density. This material, which is similar in structure to a foam, offers very good suspension properties. It can be compressed up to 60% of the original height and generates very high forces that cannot be achieved by any metallic spring with comparable installation dimensions. There is also a progressive force curve, ie at the end of the spring travel the force increases disproportionately. This effect is perceived as pleasant on the chair and is expressly desired. In addition to the use of cellular foamed polyurethane, other elastomers can also be used as a spring block.

Die Verstellung der Rückstellkraft erfolgt üblicherweise bei vorgeneigtem Sitz. Um auch in dieser Position eine gewisse Grundkraft zu erhalten, kann das Federelement an seiner Oberseite in Verlängerung der senkrechten Achse eine kegelstumpfartige Erhöhung aufweisen, die in eine entsprechende konkave Ausnehmung am Sitz eingreift. Diese Erhöhung steht auch bei vordersten Sitzneigewinkeln unter leichtem Druck und hält somit das Federelement an seiner Position. Die Übergangsflächen zwischen dem Kegelstumpf des Federelementes und der Sitzfläche sollten abgerundet ausgebildet sein, damit ein gleichmäßiges Ansteigen der Kraft beim Zurückneigen spürbar ist.The restoring force is usually adjusted when the seat is tilted forward. In order to obtain a certain basic force in this position as well, the upper side of the spring element can have a truncated cone-like extension on the vertical axis, which engages in a corresponding concave recess on the seat. This increase is under slight pressure even at the foremost seat angle and thus holds the spring element in position. The transition surfaces between the truncated cone of the spring element and the seat surface should be rounded, so that a uniform increase in the force is felt when tilting back.

Die Ausbildung des Federelementes mit einer kegelstumpfartigen Erhöhung an seiner Oberseite hat darüber hinaus den Vorteil, daß bei vorderen Sitzneigewinkeln nur solche Bereiche des Federelementes unter Druckspannung stehen, die nahe der senkrechten Drehachse des Federelementes liegen. Nur dort wird durch den Druck des Sitzes auf das Federelement eine Reibungskraft zwischen Federelement und Sitz erzeugt. Diese Reibung erfordert daher zur Überwindung nur ein geringes Drehmoment um die vertikale Drehachse des Federelementes. Dieses Bremsmoment ist so abgestimmt, daß sich das Federelement einerseits leicht drehen läßt, aber andererseits durch Erschütterungen oder Bewegungen nicht selbständig verstellt wird.The design of the spring element with a truncated cone-like elevation on its upper side also has the advantage that at front seat inclination angles only those areas of the spring element that are close to the vertical axis of rotation of the spring element are under pressure. Only there is a frictional force generated between the spring element and the seat by the pressure of the seat on the spring element. This friction therefore only requires a small torque to overcome the vertical axis of rotation of the spring element. This braking torque is adjusted so that the spring element can be easily turned on the one hand, but on the other hand is not independently adjusted by vibrations or movements.

Eine stufenlose Arretierung des Stuhles bei beliebigen Neigewinkeln kann durch ein zusätzliches Arretierelement, das beispielsweise auch eine Gasfeder sein kann, erreicht werden.A stepless locking of the chair at any angle can be achieved by an additional locking element, which can also be a gas spring, for example.

Besonders vorteilhaft ist es, die erfindungsgemäße Mechanik zur Verstellung der Rückstellkraft in Verbindung mit einem Stuhl nach der deutschen Patentanmeldung P 44 03 123.8 zu verwenden. In diesem Fall weist der Stuhl zusätzlich eine um eine Neigungslage verstellbare Rückenlehne auf, die fest mit einem Rückenlehnenträger verbunden ist, wobei der Rückenlehnenträger einen Lehnenhalter und eine winklig zum Lehnenhalter angeordnete Verlängerung aufweist, deren oberes Ende am Sitz angelenkt ist und deren unteres Ende an einem Lenker angelenkt ist, der gelenkig mit dem Sitzträger verbunden ist. In diesem Fall kann der Lenker mit einem im wesentlichen nach unten weisenden Hebel verbunden sein, der über das Arretierelement mit der horizontalen Achse verbunden ist, um den der Sitz schwenkbar gelagert ist. Ein derartiges Arretierelement ist vorzugsweise seitlich neben dem Federelement unterhalb des Sitzes anzuordnen.It is particularly advantageous to use the mechanism according to the invention for adjusting the restoring force in conjunction with a Chair according to the German patent application P 44 03 123.8 to use. In this case, the chair additionally has a backrest which can be adjusted by an inclination and which is firmly connected to a backrest support, the backrest support having a backrest holder and an extension arranged at an angle to the backrest holder, the upper end of which is articulated to the seat and the lower end of which is connected to one Handlebar is articulated, which is articulated to the seat support. In this case, the handlebar can be connected to a substantially downward-pointing lever, which is connected via the locking element to the horizontal axis, about which the seat is pivotally mounted. Such a locking element is preferably to be arranged laterally next to the spring element below the seat.

Ein Ausführungsbeispiel ist in den Zeichnungen dargestellt und wir im folgenden näher beschrieben.An embodiment is shown in the drawings and we described in more detail below.

Es zeigen:

Fig. 1
eine Seitenansicht eines erfindungsgemäßen Stuhles, der im Bereich des Federelementes geschnitten dargestellt ist;
Fig. 2
eine vergrößerte Darstellung des Ausschnitts in Fig. 1 mit dem Federelement;
Fig. 3
eine Draufsicht auf den Stuhl bei entfernter Sitzfläche und
Fig. 4
eine perspektivische Darstellung des Sitzes mit der darunter angeordneten Verstellmechanik.
Show it:
Fig. 1
a side view of a chair according to the invention, which is shown cut in the area of the spring element;
Fig. 2
an enlarged view of the detail in Figure 1 with the spring element.
Fig. 3
a plan view of the chair with the seat removed and
Fig. 4
a perspective view of the seat with the adjustment mechanism arranged below it.

Fig. 1 zeigt in schematischer Darstellung einen Bürostuhl 10 mit einem Sitzträger 11, einem Sitz 12 und einer Rückenlehne 13. Der Sitzträger 11 ist in einem stumpfen Winkel derart fest an einer Stuhlsäule 14 befestigt, daß er zur vorderen Kante des Sitzes 12 zeigt. Die Stuhlsäule 14 ist auf einem auf Rollen 15 gelagerten Fußgestell 16 angeordnet.Fig. 1 shows a schematic representation of an office chair 10 with a seat bracket 11, a seat 12 and a backrest 13. The seat bracket 11 is fixed at an obtuse angle so firmly on a chair column 14 that it points to the front edge of the seat 12. The chair column 14 is arranged on a base frame 16 mounted on rollers 15.

Am vorderen Ende des Sitzträgers 11 ist eine horizontale Achse 17 vorgesehen, an der der Sitz 12 schwenkbar angelenkt ist.At the front end of the seat support 11, a horizontal axis 17 is provided, on which the seat 12 is pivoted.

Im Sitzträger 11 ist eine Bohrung 18 vorgesehen, in der eine vertikale Achse 19 drehbar gelagert ist. Am oberen Ende dieser vertikalen Achse 19 ist ein horizontaler Drehteller 20 angebracht, der auf einer waagerechten Fläche 21 des Sitzträgers 11 aufliegt. Auf diesem Drehteller 20 ist ein elastisches Federelement 22 befestigt, das zusammen mit dem Drehteller 20 um die Achse 19 drehbar ist.A bore 18 is provided in the seat support 11, in which a vertical axis 19 is rotatably mounted. At the upper end of this vertical axis 19, a horizontal turntable 20 is attached, which rests on a horizontal surface 21 of the seat support 11. On this turntable 20, an elastic spring element 22 is fastened, which together with the turntable 20 can be rotated about the axis 19.

Dieses Federelement 22 besteht aus einem zellig geschäumten Polyurethan mit einem hohen Raumgewicht.This spring element 22 consists of a cellularly foamed polyurethane with a high density.

Form und Lage des Federelementes sind besser in den Fig. 2 und 3 zu erkennen. Fig. 2 zeigt das Federelement 22, das auf dem Drehteller 20 angeordnet ist, der wiederum auf der waagerechten Platte 21 des Sitzträgers 11 aufliegt. Der Drehteller 20 ist über die Achse 19, die durch eine Bohrung 18 im Sitzträger 11 hindurchgeht, mittels eines Hebels 23 drehbar.The shape and position of the spring element can be seen better in FIGS. 2 and 3. Fig. 2 shows the spring element 22 which is arranged on the turntable 20, which in turn rests on the horizontal plate 21 of the seat support 11. The turntable 20 can be rotated by means of a lever 23 via the axis 19, which passes through a bore 18 in the seat support 11.

Das Federelement 22 hat, wie die Draufsicht in Fig. 3 deutlich zeigt, einen in etwa runden Bereich 22.1 und eine Verlängerung 22.2. An seiner Oberseite ist das Federelement 22 von der Verlängerung der Achse 19 bis zu seinen äußeren Rändern leicht fallend abgeschrägt (Fig. 2). Außerdem weist es oberhalb der Verlängerung der Achse 19 eine kegelstumpfartige Erhöhung auf, wobei die Ränder dieses Kegelstumpfes 24 leicht abgerundet sind. An der diesem Kegelstumpf 24 gegenüberliegenden Seite des Sitzes 12 ist im Sitz 12 eine diesem Kegelstumpf 24 entsprechende Vertiefung 25 vorgesehen, in die der Kegelstumpf 24 hineinragt.As the plan view in FIG. 3 clearly shows, the spring element 22 has an approximately round region 22.1 and an extension 22.2. On its upper side, the spring element 22 is chamfered slightly falling from the extension of the axis 19 to its outer edges (FIG. 2). In addition, it has a truncated cone-like elevation above the extension of the axis 19, the edges of this truncated cone 24 being slightly rounded. On the side opposite this truncated cone 24 of the seat 12, a recess 25 corresponding to this truncated cone 24 is provided in the seat 12, into which the truncated cone 24 protrudes.

Dieses Federelement kann wie in Fig. 2 und in Fig. 3 mit durchgezogenen Linien gezeigt, so gestellt werden, daß die Verlängerung 22.2 des Federelementes 22 zwischen der senkrechten Achse 19 und der horizontalen Achse 17 liegt. In dieser Position, in der sieh der größte Teil des Federelementes nahe der Schwenkachse 17 des Sitzes 12 befindet, wird bei einer Neigebewegung des Sitzes 12 nur ein kleiner Anteil des Volumens des Federelementes 22 zusammengedrückt. Die vom Federelement 22 auf den Sitz 12 ausgeübte Kraft ist daher in dieser Position gering.This spring element can, as shown in Fig. 2 and in Fig. 3 with solid lines, be set so that the extension 22.2 of the spring element 22 lies between the vertical axis 19 and the horizontal axis 17. In this position, in which the largest part of the spring element is located near the pivot axis 17 of the seat 12, only a small proportion of the volume of the spring element 22 is compressed when the seat 12 is tilted. The force exerted by the spring element 22 on the seat 12 is therefore low in this position.

Das Federelement 22 kann aber in Richtung des Pfeiles 26, d. h. in der Draufsicht entgegen des Uhrzeigersinnes, um eine Viertelumdrehung gedreht werden, um die Verlängerung 22.2 des Federelementes 22 in eine von der horizontalen Achse 17 entfernte Position zu bringen. In dieser Lage liegt nun der größte Teil des Federelementes 22 in deutlicher Entfernung zur Schwenkachse 17 des Sitzes 12, so daß eine Neigung des Sitzes 12 eine starke Komprimierung des Federelementes 22 und somit eine sehr hohe Rückstellkraft zur Folge hat. Somit kann durch Drehen des Federelementes um die Achse 19 mittels des Hebels 23 die vom Federelement 22 auf den Sitz 12 ausgeübte Rückstellkraft stufenlos verstellt werden.The spring element 22 can, however, in the direction of arrow 26, i.e. H. in the top view counterclockwise, a quarter turn to bring the extension 22.2 of the spring element 22 in a position away from the horizontal axis 17. In this position, the largest part of the spring element 22 is now at a significant distance from the pivot axis 17 of the seat 12, so that an inclination of the seat 12 results in a strong compression of the spring element 22 and thus a very high restoring force. Thus, by turning the spring element about the axis 19 by means of the lever 23, the restoring force exerted by the spring element 22 on the seat 12 can be continuously adjusted.

An der Stuhlsäule 14 ist mittels einer Achse 27 ein Lenker 28 befestigt, mit dem über einen Lehnenhalter 29 die Lehne 13 zu bewegen ist (Fig. 2). Die Achse 27 ist fest mit dem Lenker 28 und mit einem Hebel 30 verbunden, an dessen Ende das eine Ende eines Arretierelementes 31 befestigt ist. Das andere Ende dieses Arretierelementes 31 ist mit der horizontalen Achse 17 verbunden, um die der Sitz 12 schwenkbar ist. Im vorliegenden Falle ist das Arretierelement eine Gasfeder, die in verschiedenen Längen feststellbar ist.A handlebar 28 is fastened to the chair column 14 by means of an axle 27, with which the backrest 13 can be moved via a backrest holder 29 (FIG. 2). The axis 27 is fixed to the handlebar 28 and to a lever 30, at the end of which one end of a locking element 31 is attached. The other end of this locking element 31 is connected to the horizontal axis 17 about which the seat 12 is pivotable. In the present case, the locking element is a gas spring, which in different Lengths can be determined.

Die Fig. 4 zeigt noch einmal deutlich den Zusammenbau von Sitz 12, Federelement 22 und Sitzträger 11. Der Sitz 12 ist mit seiner Ausnehmung 25 auf der kegelstumpfartigen Erhöhung 24 des Federelementes 22 gelagert. Das Federelement 22 liegt wiederum auf einer Platte 20, die zusammen mit der Achse 19 durch den Hebel 23 gedreht werden kann.4 clearly shows once again the assembly of seat 12, spring element 22 and seat support 11. Seat 12 is mounted with its recess 25 on the frustoconical elevation 24 of spring element 22. The spring element 22 in turn lies on a plate 20 which can be rotated together with the axis 19 by the lever 23.

Claims (9)

Stuhl, insbesondere Bürostuhl (10), mit einem Sitzträger (11), einem darauf um eine horizontale Achse (17) verschwenkbar gelagerten Sitz (12) und einem elastischen Federelement (22) zwischen dem Sitz (12) und dem Sitzträger (11), dadurch gekennzeichnet, daß das Federelement (22) um eine im wesentlichen senkrechte Achse (19) drehbar angeordnet ist und so ausgebildet ist, daß durch ein Drehen des Federelementes (22) die örtliche Verteilung der vom Federelement (22) auf die Sitzfläche (12) ausgeübten Kraft variierbar ist.Chair, in particular office chair (10), with a seat support (11), a seat (12) pivotably mounted thereon about a horizontal axis (17) and an elastic spring element (22) between the seat (12) and the seat support (11), characterized in that the spring element (22) is arranged to be rotatable about an essentially vertical axis (19) and is designed such that, by rotating the spring element (22), the local distribution of the spring element (22) to the seat surface (12) exerted force is variable. Stuhl nach Anspruch 1, dadurch gekennzeichnet, daß das Federelement (22) eine unterschiedliche radiale Ausdehnung zur Achse (19) aufweist.Chair according to claim 1, characterized in that the spring element (22) has a different radial extension to the axis (19). Stuhl nach Anspruch 1, dadurch gekennzeichnet, daß das Federelement (22) um die Achse (19) herum unterschiedliche Federungseigenschaften aufweist.Chair according to claim 1, characterized in that the spring element (22) has different suspension properties around the axis (19). Stuhl nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das Federelement (22) einen Teil aus einem zellig geschäumten Polyurethan aufweist.Chair according to one of claims 1 to 3, characterized in that the spring element (22) has a part made of a cellularly foamed polyurethane. Stuhl nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das Federelement (22) in einer im wesentlichen zum Sitz (12) parallelen Richtung eine Verlängerung (22.2) aufweist und um etwa 90° stufenlos drehbar ist.Chair according to one of Claims 1 to 4, characterized in that the spring element (22) has an extension (22.2) in a direction essentially parallel to the seat (12) and can be rotated continuously by approximately 90 °. Stuhl nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß das Federelement (22) an seiner Oberseite in Verlängerung der senkrechten Achse (19) eine kegelstumpfartige Erhöhung (24) aufweist, die in eine entsprechende konkave Ausnehmung (25) am Sitz (12) eingreift.Chair according to one of claims 1 to 5, characterized in that the spring element (22) has on its upper side in extension of the vertical axis (19) a truncated cone-like elevation (24) which fits into a corresponding concave recess (25) on the seat (12 ) intervenes. Stuhl nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß der Stuhl ein Arretierelement (31) aufweist, um den Sitz (12) in einer beliebigen Neigung zu fixieren.Chair according to one of claims 1 to 6, characterized in that the chair has a locking element (31) in order to fix the seat (12) at any inclination. Stuhl nach Anspruch 7, dadurch gekennzeichnet, daß der Stuhl eine um ihre Neigungslage verstellbare Rückenlehne (13) aufweist, die fest mit einem Rückenlehnenträger verbunden ist, wobei der Rückenlehnenträger einen Lehnenhalter (29) und eine winklig zum Lehnenhalter angeordnete Verlängerung aufweist, deren oberes Ende am Sitz (12) angelenkt ist und deren unteres Ende an einem Lenker (28) angelenkt ist, der über eine Achse (27) gelenkig mit dem Sitzträger (11) verbunden ist, wobei der Lenker (28) einen fest mit ihm verbundenen Hebel (30) aufweist, der über das Arretierelement (31) mit der horizontalen Achse (17) verbunden ist.Chair according to claim 7, characterized in that the chair has a backrest (13) which is adjustable about its inclination and which is fixedly connected to a backrest support, the backrest support having a backrest holder (29) and an extension arranged at an angle to the backrest holder, the upper end of which is articulated on the seat (12) and the lower end of which is articulated on a link (28) which is articulated to the seat support (11) via an axle (27), the link (28) having a lever () 30) which is connected to the horizontal axis (17) via the locking element (31). Stuhl nach einem der Ansprüche 7 oder 8, dadurch gekennzeichnet, daß das Arretierelement (31) eine Gasfeder ist.Chair according to one of claims 7 or 8, characterized in that the locking element (31) is a gas spring.
EP95108361A 1994-06-21 1995-06-01 Chair, particularly office-chair Withdrawn EP0688522A1 (en)

Applications Claiming Priority (2)

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DE4421597 1994-06-21
DE19944421597 DE4421597A1 (en) 1994-06-21 1994-06-21 Chair, especially office chair

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EP0688522A1 true EP0688522A1 (en) 1995-12-27

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WO2001078558A1 (en) * 2000-04-14 2001-10-25 Provenda Marketing Ag Seating, in particular an office chair
WO2007112236A1 (en) * 2006-03-24 2007-10-04 Hni Corporation Reclining chair with enhanced adjustability
USD731833S1 (en) 2014-04-17 2015-06-16 Allsteel Inc. Chair
US9332851B2 (en) 2013-03-15 2016-05-10 Hni Technologies Inc. Chair with activated back flex
US9504331B2 (en) 2007-03-13 2016-11-29 Hni Technologies Inc. Dynamic chair back lumbar support system
USD796883S1 (en) 2014-10-15 2017-09-12 Hni Technologies Inc. Chair
US9801470B2 (en) 2014-10-15 2017-10-31 Hni Technologies Inc. Molded chair with integrated support and method of making same
US10064493B2 (en) 2014-04-17 2018-09-04 Hni Technologies Inc. Flex lumbar support
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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001078558A1 (en) * 2000-04-14 2001-10-25 Provenda Marketing Ag Seating, in particular an office chair
WO2007112236A1 (en) * 2006-03-24 2007-10-04 Hni Corporation Reclining chair with enhanced adjustability
US7837265B2 (en) 2006-03-24 2010-11-23 Hni Corporation Reclining chair with enhanced adjustability
CN101522075B (en) * 2006-03-24 2012-03-28 Hni技术公司 Reclining chair with enhanced adjustability
US8297701B2 (en) 2006-03-24 2012-10-30 Hni Technologies, Inc. Reclining chair with enhanced adjustability
US9504331B2 (en) 2007-03-13 2016-11-29 Hni Technologies Inc. Dynamic chair back lumbar support system
US11725382B2 (en) 2010-05-05 2023-08-15 Allsteel Inc. Modular wall system
US10927545B2 (en) 2010-05-05 2021-02-23 Allsteel Inc. Modular wall system
US10172465B2 (en) 2013-03-15 2019-01-08 Hni Technologies Inc. Chair with activated back flex
US10893752B2 (en) 2013-03-15 2021-01-19 Hni Technologies Inc. Chair with activated back flex
US9332851B2 (en) 2013-03-15 2016-05-10 Hni Technologies Inc. Chair with activated back flex
US10064493B2 (en) 2014-04-17 2018-09-04 Hni Technologies Inc. Flex lumbar support
USD731833S1 (en) 2014-04-17 2015-06-16 Allsteel Inc. Chair
US9801470B2 (en) 2014-10-15 2017-10-31 Hni Technologies Inc. Molded chair with integrated support and method of making same
USD833193S1 (en) 2014-10-15 2018-11-13 Artco-Bell Corporation Chair
USD796883S1 (en) 2014-10-15 2017-09-12 Hni Technologies Inc. Chair

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