EP0295214B1 - Chair - Google Patents

Chair Download PDF

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Publication number
EP0295214B1
EP0295214B1 EP88810371A EP88810371A EP0295214B1 EP 0295214 B1 EP0295214 B1 EP 0295214B1 EP 88810371 A EP88810371 A EP 88810371A EP 88810371 A EP88810371 A EP 88810371A EP 0295214 B1 EP0295214 B1 EP 0295214B1
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EP
European Patent Office
Prior art keywords
backrest
seat
spindle
chair
chair according
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.)
Expired - Lifetime
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EP88810371A
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German (de)
French (fr)
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EP0295214A1 (en
Inventor
Egon Bräuning
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Protoned BV
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Protoned BV
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Priority to AT88810371T priority Critical patent/ATE67381T1/en
Publication of EP0295214A1 publication Critical patent/EP0295214A1/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
    • A47C7/00—Parts, details, or accessories of chairs or stools
    • A47C7/36—Supports for the head or the back
    • A47C7/40—Supports for the head or the back for the back
    • A47C7/44—Supports for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame
    • A47C7/445—Supports for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame with bar or leaf springs

Definitions

  • the invention relates to seating furniture according to the preamble of the independent claim.
  • the functional coupling of seat and backrest which is referred to in the industry as "synchronous”, should be solved as far as possible in such a way that, on the one hand, the rear section of the seat adjoining the backrest is only lowered when the seated person presses the backrest backwards and that, on the other hand, the backrest, regardless of the load on the seat, maintains its vertical position as long as no direct force is exerted on it.
  • the chair shown in Fig. 1 with no essential details consists of a frame 1, a seat 2 and a backrest 3.
  • the frame 1 has essentially two approximately right-angled feet 4 formed from tubular profiles, which on the front of the chair carry a first pivot axis A1.
  • the frame also includes the lower section 3a (FIG. 2) of the backrest 3, which is connected to the feet 4 via a cross member 5 and thus forms an integral part of the frame.
  • the backrest 3 is a plastic plate 6 which extends over the entire height of the chair and which is reinforced with two longitudinal steel strips 7 which are flexibly fastened to the cross member 5 with their lower ends. Thanks to this construction, the backrest 3 has a certain elasticity, so that it yields under load and automatically resumes its original position when unloaded. As can be seen from the following Description still follows, this elastic spring action is required especially in the lower backrest section 3a.
  • the seat designated as a whole by 2
  • the seat thus forms a kind of two-armed lever with the front lever arm c and the axis of rotation A1.
  • the seat frame 8 engages behind the backrest 3 and is connected to the backrest 3 on the rear side thereof by means of a second pivot axis A2.
  • This second pivot axis A2 is on the one hand rigidly attached to the back of the backrest 3 by means of a bracket 10 and on the other hand carries at its two end sections two connecting straps 11, on which the rear section of the seat frame 8 is suspended.
  • the two connecting straps 11 are thus rotatably mounted about the axis A2 and have the function of transmitting any movement of the backrest 3 to the seat frame 8.
  • the second pivot axis A2 is located at a vertical distance b from an imaginary horizontal plane through the axis A1 that it is approximately at the level of the lumbar vertebrae of the seated person.
  • a horizontal distance a of the axis A2 from the backrest 3 should preferably also be provided, e.g. can be between 5 and 20 cm.
  • the backrest 3 is loaded in the area of the lumbar vertebrae (arrow B in FIG. 2), it bends backwards due to its inherent elasticity into the position indicated by broken lines.
  • the axis A2 describes a circular arc with the radius A1-A2 and lowers the rear, the backrest 3 adjacent seat section by a corresponding amount. The seated person has thus found a new seating position that meets the ergonomic criteria.
  • FIGS. 1 and 2 The chair shown in FIGS. 1 and 2 is only one possible embodiment which can be modified in various ways by a person skilled in the art within the scope of the inventive concept. So it may be advantageous with a view to achieving a simple construction to extend the backrest 3 shown in one piece downwards and to fasten it to the lower frame element; but it would still be possible to attach the backrest to the frame at about the height of the seat level and either flexibly attach it to a crossbar or steer it by means of a further horizontal axis. In any case, however, at least that section of the backrest 3 that extends from the fastening point of the axis A2 to the lower clamping point of the backrest 3 should be designed to be elastically resilient. The achievement of a corresponding elastic restoring force can be achieved by training the Backrest 3 in plastic, steel or by connecting different materials can be achieved.
  • a decisive advantage of the construction described is the fact that the chair manages with a very simple seat-backrest adjustment mechanism that does not require any coil springs or gas springs and thus results in easy and inexpensive seating, while on the other hand the function achieved by it Consideration of seating comfort corresponds to a fully adequate solution.
  • 3 and 4 show a modification of the inventive concept, the padding not being shown here either, for the sake of clarity.
  • the three basic units i.e. to distinguish a supporting frame 11, a seat 12 and a backrest 13.
  • the commercially available frame 11 provided with rollers 14 carries a cross member 15 which is designed in the form of a steel profile and is rigidly attached to the upper part of the frame.
  • the crossmember 15 On its front edge, the crossmember 15 carries a pivot axis A1, on which the seat 12 is suspended in such a way that it can also perform a rocking movement about the axis A1 in the manner of a two-armed lever.
  • the longer seat section is self-supporting, i.e. not connected to the backrest.
  • the backrest 13 which in turn can consist, for example, of an elastic plastic plate 16 and reinforcing steel strips 17, is on anchored its lower end to the cross member 15 in such a way that it can be pivoted about an axis A3 located on the cross member.
  • a pivot axis A2 is also attached here, at a distance b above a horizontal plane through the axis A1 (corresponding to the position of the lumbar vertebrae) and at a distance a from the backrest itself.
  • This is actuated by an actuating linkage 18 which extends from the front seat section on both sides and above the seat and thus simultaneously forms the armrests of the chair on the one hand, and on the other hand represents the connecting link between the backrest and the seat.
  • the actuating linkage 18 comprises two actuating levers which start from the pivot axis A1 and are rigidly attached to the underside of the seat on both sides thereof.
  • the axis A1 can be, for example, a tube in which the ends of the two actuating levers 18 are rotatably mounted.
  • the axes A1, A2 and A3 illustrated with the aid of FIGS. be designed as a pivot, as hinges, etc.

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  • Chairs Characterized By Structure (AREA)
  • Chair Legs, Seat Parts, And Backrests (AREA)
  • Chairs For Special Purposes, Such As Reclining Chairs (AREA)
  • Special Chairs (AREA)

Abstract

A seat (2) is mounted pivotably about a first axle (A1) on the stand (1) of the chair. The seat frame (8) is connected to a second axle (A2) which is fastened to the backrest (3) behind the backrest (3) at a horizontal distance from the latter and at a vertical distance from the first axle (A1). The backrest (3) produced from an elastically resilient material, when deflected out of its vertical position, causes the second axle (A2) to move over an arc of a circle of radius A1-A2; the rear seat portion adjacent to the backrest (3) is also lowered correspondingly thereby. The backrest (3) extending over the entire height of the chair forms with its lower portion an integral component of the chair stand (1). In comparison with the known complicated and heavy backrest/seat adjustment mechanisms, a cost-effective and lightweight construction, but one which fully satisfies modern ergonomic requirements as regards sitting comfort, is proposed here.

Description

Die Erfindung betrifft ein Sitzmöbel gemäss dem Oberbegriff des unabhängigen Patentanspruchs.The invention relates to seating furniture according to the preamble of the independent claim.

Es ist eine bekannte Tatsache, dass das längere Sitzen in einer ganz bestimmten Sitzposition alsbald zu Ermüdung führt und dass jeder Sitzende daher im allgemeinen die Tendenz zeigt, seine Lage von Zeit zu Zeit zu verändern. Diese Lageveränderungen erstrecken sich zwar in erster Linie au die Winkelverstellung der Rückenlehne, doch hat sich gezeigt, dass jegliche Verschwenkung der Rückenlehne nach hinten, wenn dieselbe nicht zu einer ergonomisch untragbaren Position führen soll, mit einer entsprechenden Verstellung des Sitzes gekoppelt sein soll. Nur so ist es erfahrungsgemäss möglich, den menschlichen Körper im Sitzen so abzustützen, dass dieser in allen möglichen Stellungen der Rückenlehne längere Zeit ermüdungsfrei sitzen kann.It is a known fact that sitting in a certain sitting position for long periods of time soon leads to fatigue and therefore every person generally tends to change their position from time to time. Although these changes in position primarily extend to the angle adjustment of the backrest, it has been shown that any pivoting of the backrest to the rear, if it should not lead to an ergonomically unacceptable position, should be coupled with a corresponding adjustment of the seat. Experience has shown that this is the only way to support the human body while sitting so that it can sit in all possible positions of the backrest for a long time without fatigue.

Der dadurch bedingten Ausbildung der Sitzflächen-Rückenlehnen-Verstellmechanik sind bereits zahlreiche Konstruktionen gewidmet, die somit alle das Ziel haben, den hinteren, der Rückenlehne benachbarten Sitzabschnitt beim Zurückschwenken der Rückenlehne um ein entsprechendes Mass abzusenken, damit der Sitzende in der neuen Lage nicht nach vorne zu rutschen droht. Diese bekannten Konstruktionen beruhen jedoch durchwegs auf der Verwendung von Hebelgestängen mit Stahl- und/oder Gasfedern, so dass die zur Zeit bekannten, den oben angegebenen Kriterien entsprechenden Stühle nicht nur konstruktiv kompliziert, sondern auch kostspielig und relativ schwer sind. Eine solche Stuhlkonstruktion geht aus der US-PS 2961035 hervor, wo eine am Stuhlgestell schwenkbar gelagerte Rückenlehne federnd aufgehängt ist und über Hebelmittel entgegen einer Stahlfeder so mit den Tragelementen der Sitzauflage gekuppelt ist, dass bei einer Rückwärtsverschwenkung der Rückenlehne gleichzeitig eine Abwärtsbewegung des Hinterteils der Sitzauflage stattfindet.The resulting design of the seat backrest adjustment mechanism is already devoted to numerous constructions, all of which therefore have the aim of lowering the rear seat section adjacent to the backrest by a corresponding amount when the backrest is pivoted back, so that the seated person does not move forward in the new position threatens to slip. However, these known constructions are based entirely on the use of lever linkages with steel and / or gas springs, so that the chairs known at the moment and which meet the criteria specified above are not only structurally complicated, but also are expensive and relatively heavy. Such a chair construction is apparent from US-PS 2961035, where a backrest pivotally mounted on the chair frame is resiliently suspended and is coupled to the supporting elements of the seat cover by lever means against a steel spring such that when the backrest is pivoted backwards, a downward movement of the rear part of the seat cover is simultaneously effected takes place.

Es ist somit Aufgabe der vorliegenden Erfindung, ein Sitzmöbel der eingangs beschriebenen Art vorzuschlagen, das zwar einerseits die von ergonomischen Gesichtspunkten angestrebte Koppelung der Verstellbewegungen von Sitz und Rückenlehne aufweist, andererseits aber ohne die bekannten aufwendigen und schweren Verstell- und Auffangmechanismen auskommt. Dabei soll die Funktionskoppelung von Sitz und Rückenlehne, welche in der Branche als "synchron" bezeichnet wird, nach Möglichkeit so gelöst sein, dass einerseits der hintere, an die Rückenlehne angrenzende Sitzflächenabschnitt erst dann abgesenkt wird, wenn der Sitzende die Rückenlehne nach hinten drückt und dass andererseits die Rückenlehne, unabhängig von der Belastung der Sitzfläche, ihre Vertikallage beibehält, solange keine direkte Krafteinwirkung auf dieselbe erfolgt.It is therefore an object of the present invention to propose a piece of seating furniture of the type described at the outset which, on the one hand, has the coupling of the adjustment movements of the seat and backrest which is desired from an ergonomic point of view, but on the other hand does not require the known complex and heavy adjustment and catching mechanisms. The functional coupling of seat and backrest, which is referred to in the industry as "synchronous", should be solved as far as possible in such a way that, on the one hand, the rear section of the seat adjoining the backrest is only lowered when the seated person presses the backrest backwards and that, on the other hand, the backrest, regardless of the load on the seat, maintains its vertical position as long as no direct force is exerted on it.

Diese Aufgabe wird durch die im kennzeichnenden Teil des unabhängigen Patentanspruchs 1 definierte Merkmalskombination gelöst, die auf der überraschenden Einsicht beruht, dass die Funktionen der bekannten Verstellmechanismen so in die prinzipiellen Stuhlteile ― Gestell, Sitz und Rükkenlehne ― integriert werden können, dass ein kostengünstiges und leichtes Sitzmöbel resultiert, das den bekannten ergonomischen Anforderungen an den Sitzkomfort durchaus standzuhalten vermag, ohne mit den Nachteilen der bekannten Mechanismen behaftet zu sein.This object is achieved by the combination of features defined in the characterizing part of independent claim 1, which is based on the surprising insight that the functions of the known adjustment mechanisms can be integrated into the basic chair parts - frame, seat and backrest - in such a way that they are inexpensive and light Seating results, which is able to withstand the known ergonomic requirements for seating comfort without being burdened with the disadvantages of the known mechanisms.

Nachstehend werden anhand der beiliegenden Zeichnung einige Ausführungsbeispiele des Erfindungsgegenstandes beschrieben.

  • Fig. 1 zeigt in vereinfachter Perspektivansicht eine erste Ausführungsform des erfindungsgemässen Sitzmöbels vor Anbringung der Polsterung,
  • Fig. 2 ist ein Vertikalschnitt dieser Ausführungsform,
  • Fig. 3 ist eine Perspektivdarstellung einer Variante und
  • Fig. 4 ist die entsprechende Vertikalschnittdarstellung.
Some exemplary embodiments of the subject matter of the invention are described below with reference to the accompanying drawing.
  • 1 shows a simplified perspective view of a first embodiment of the seating furniture according to the invention before the upholstery is attached,
  • Fig. 2 is a vertical section of this embodiment,
  • Fig. 3 is a perspective view of a variant and
  • Fig. 4 is the corresponding vertical sectional view.

Der in Fig. 1 unter Verzicht auf unwesentliche Einzelheiten dargestellte Stuhl besteht aus einem Gestell 1, einem Sitz 2 und einer Rückenlehne 3. Das Gestell 1 weist im wesentlichen zwei annähernd rechtwinklig abgebogene, aus Rohrprofilen gebildete Füsse 4 auf, welche an der Stuhl-Vorderseite eine erste Schwenkachse A1 tragen. Zum Gestell gehört bei dieser Ausführungsform ferner der untere Abschnitt 3a (Fig. 2) der Rückenlehne 3, welcher über einen Querträger 5 mit den Füssen 4 verbunden ist und damit einen integrierenden Bestandteil des Gestells bildet.The chair shown in Fig. 1 with no essential details consists of a frame 1, a seat 2 and a backrest 3. The frame 1 has essentially two approximately right-angled feet 4 formed from tubular profiles, which on the front of the chair carry a first pivot axis A1. In this embodiment, the frame also includes the lower section 3a (FIG. 2) of the backrest 3, which is connected to the feet 4 via a cross member 5 and thus forms an integral part of the frame.

Die Rückenlehne 3 ist bei dieser ersten Ausführungsform eine sich über die gesamte Stuhlhöhe erstreckende Kunststoffplatte 6, welche mit zwei längsverlaufenden Stahlbändern 7 verstärkt ist, die mit ihren unteren Enden an dem Querträger 5 flexibel befestigt sind. Dank dieser Konstruktion besitzt die Rückenlehne 3 eine bestimmte Federelastizität, sodass sie bei Belastung nachgibt und bei Entlastung ihre ursprüngliche Lage selbsttätig wieder einnimmt. Wie sich aus der nachfolgenden Beschreibung noch ergeben wird, ist diese elastische Federwirkung vor allem im unteren Rückenlehnenabschnitt 3a erforderlich.In this first embodiment, the backrest 3 is a plastic plate 6 which extends over the entire height of the chair and which is reinforced with two longitudinal steel strips 7 which are flexibly fastened to the cross member 5 with their lower ends. Thanks to this construction, the backrest 3 has a certain elasticity, so that it yields under load and automatically resumes its original position when unloaded. As can be seen from the following Description still follows, this elastic spring action is required especially in the lower backrest section 3a.

Der gesamthaft mit 2 bezeichnete Sitz weist einen praktisch U-förmigen Rahmen 8 auf, der beispielsweise ebenfalls aus einem Rohrprofil erstellt sein kann und im Bereich des vorderen Sitzabschnitts, im Abstand c von der Sitzvorderkante, mittels zweier Schwenkbügel 9 in einer rohrförmigen Traverse 9a drehbar gelagert ist. Der Sitz bildet somit eine Art zweiarmigen Hebels mit dem vorderen Hebelarm c und der Drehachse A1. Wie Fig. 1 und 2 ferner zeigen, hintergreift der Sitzrahmen 8 die Rückenlehne 3 und ist an deren Rückseite mittels einer zweiten Schwenkachse A2 mit der Rückenlehne 3 verbunden. Diese zweite Schwenkachse A2 ist einerseits mittels einer Konsole 10 starr an der Rückseite der Rückenlehne 3 befestigt und trägt andererseits an ihrer beiden Endabschnitten zwei Verbindungslaschen 11, an denen der hintere Abschnitt des Sitzrahmens 8 aufgehängt ist. Die beiden Verbindungslaschen 11 sind somit um die Achse A2 drehbar gelagert und haben die Funktion, jegliche Bewegung der Rückenlehne 3 auf den Sitzrahmen 8 zu übertragen.The seat, designated as a whole by 2, has a practically U-shaped frame 8, which, for example, can also be created from a tubular profile and is rotatably supported in the area of the front seat section, at a distance c from the front edge of the seat, by means of two swivel brackets 9 in a tubular cross member 9a is. The seat thus forms a kind of two-armed lever with the front lever arm c and the axis of rotation A1. As FIGS. 1 and 2 also show, the seat frame 8 engages behind the backrest 3 and is connected to the backrest 3 on the rear side thereof by means of a second pivot axis A2. This second pivot axis A2 is on the one hand rigidly attached to the back of the backrest 3 by means of a bracket 10 and on the other hand carries at its two end sections two connecting straps 11, on which the rear section of the seat frame 8 is suspended. The two connecting straps 11 are thus rotatably mounted about the axis A2 and have the function of transmitting any movement of the backrest 3 to the seat frame 8.

Die zweite Schwenkachse A2 befindet sich in einem solchen vertikalen Abstand b von einer gedachten, durch die Achse A1 gelegten Horizontalebene, dass sie sich etwa auf der Höhe der Lendenwirbel der sitzenden Person befindet. Vorzugsweise sollte ferner ein waagrechter Abstand a der Achse A2 von der Rückenlehne 3 vorgesehen sein, der z.B. zwischen 5 und 20 cm liegen kann.The second pivot axis A2 is located at a vertical distance b from an imaginary horizontal plane through the axis A1 that it is approximately at the level of the lumbar vertebrae of the seated person. A horizontal distance a of the axis A2 from the backrest 3 should preferably also be provided, e.g. can be between 5 and 20 cm.

Bei der Benützung des beschriebenen Stuhles ergibt sich folgendes:When using the chair described, the following results:

Nachdem die sitzende Person zunächst während einer gewissen Zeit in der vertikalen Sitzposition verharrte, welche den in Fig. 2 voll ausgezogenen Konturen der Sitz- Rückenlehnen-Kombination entspricht, wird sich erfahrungsgemäss das Bedürfnis einstellen, durch Verstellung der Rückenlehne 3 eine andere Sitzposition einzunehmen. Wird nun die Rückenlehne 3, wie dies normalerweise der Fall ist, im Bereich der Lendenwirbel (Pfeil B in Fig. 2) belastet, so biegt sie sich aufgrund ihrer Eigenelastizität nach hinten in die mit unterbrochenen Linien angedeutete Lage. Dabei beschreibt die Achse A2 einen Kreisbogen mit dem Radius A₁-A₂ und senkt den hinteren, der Rückenlehne 3 benachbarten Sitzabschnitt um ein entsprechendes Mass ab. Die sitzende Person hat damit eine neue Sitzlage gefunden, welche den ergonomischen Kriterien entspricht.After the seated person initially remained in the vertical sitting position for a certain time, which corresponds to the fully drawn contours of the seat-backrest combination in FIG. 2, experience has shown that the need to adopt a different sitting position by adjusting the backrest 3. If, as is normally the case, the backrest 3 is loaded in the area of the lumbar vertebrae (arrow B in FIG. 2), it bends backwards due to its inherent elasticity into the position indicated by broken lines. The axis A2 describes a circular arc with the radius A₁-A₂ and lowers the rear, the backrest 3 adjacent seat section by a corresponding amount. The seated person has thus found a new seating position that meets the ergonomic criteria.

Der in Fig. 1 und 2 dargestellte Stuhl ist lediglich eine mögliche Ausführungsform, die vom Fachmann im Rahmen des Erfindungsgedankens in mannigfaltiger Hinsicht abgewandelt werden kann. So kann es zwar im Hinblick auf die Erzielung einer einfachen Bauweise von Vorteil sein, die dargestellte Rückenlehne 3 einteilig nach unten zu verlängern und am unteren Gestellelement zu befestigen; doch wäre es immerhin auch möglich, die Rückenlehne etwa auf der Höhe der Sitzebene am Gestell anzubringen und dort an einer Traverse entweder flexibel zu befestigen oder mittels einer weiteren horizontalen Achse anzulenken. In jedem Falle sollte aber mindestens derjenige Abschnitt der Rückenlehne 3, der sich von der Befestigungsstelle der Achse A2 bis zur unteren Einspannstelle der Rückenlehne 3 erstreckt, elastisch federnd ausgebildet sein. Die Erzielung einer entsprechenden elastischen Rückstellkraft kann durch Ausbildung der Rückelehne 3 in Kunststoff, Stahl oder durch Verbindung verschiedener Werkstoffe erzielt werden.The chair shown in FIGS. 1 and 2 is only one possible embodiment which can be modified in various ways by a person skilled in the art within the scope of the inventive concept. So it may be advantageous with a view to achieving a simple construction to extend the backrest 3 shown in one piece downwards and to fasten it to the lower frame element; but it would still be possible to attach the backrest to the frame at about the height of the seat level and either flexibly attach it to a crossbar or steer it by means of a further horizontal axis. In any case, however, at least that section of the backrest 3 that extends from the fastening point of the axis A2 to the lower clamping point of the backrest 3 should be designed to be elastically resilient. The achievement of a corresponding elastic restoring force can be achieved by training the Backrest 3 in plastic, steel or by connecting different materials can be achieved.

Als entscheidender Vorteil der beschriebenen Konstruktion muss die Tatsache gewertet werden, dass der Stuhl einerseits mit einer höchst einfachen Sitz-Rückenlehnen-Verstellmechanik auskommt, welche keinerlei Schraubenfedern oder Gasfedern benötigt und damit ein leichtes und kostengünstig erstellbares Sitzmöbel ergibt, während andererseits die damit erzielte Funktion vom Gesichtspunkte des Sitzkomforts einer durchaus vollwertigen Lösung entspricht.A decisive advantage of the construction described is the fact that the chair manages with a very simple seat-backrest adjustment mechanism that does not require any coil springs or gas springs and thus results in easy and inexpensive seating, while on the other hand the function achieved by it Consideration of seating comfort corresponds to a fully adequate solution.

Eine Abwandlung des Erfindungsgedankens zeigen die Fig. 3 und 4, wobei auch hier, der Uebersichtlichkeit halber, die Polsterung nicht dargestellt wurde. Auch in diesem Falle sind am Stuhl die drei prinzipiellen Einheiten, d.h. ein tragendes Gestell 11, ein Sitz 12 und eine Rückenlehne 13 zu unterscheiden. Das handelsübliche, mit Rollen 14 versehene Gestell 11 trägt eine in Form eines Stahlprofils ausgebildete Traverse 15, welche starr am Gestelloberteil befestigt ist.3 and 4 show a modification of the inventive concept, the padding not being shown here either, for the sake of clarity. In this case too, the three basic units, i.e. to distinguish a supporting frame 11, a seat 12 and a backrest 13. The commercially available frame 11 provided with rollers 14 carries a cross member 15 which is designed in the form of a steel profile and is rigidly attached to the upper part of the frame.

An ihrer Vorderkante trägt die Traverse 15 eine Schwenkachse A1, an welcher der Sitz 12 so aufgehängt ist, dass er auch hier nach Art eines zweiarmigen Hebels eine Wippbewegung um die Achse A1 ausführen kann. Im Gegensatz zu der in Fig. 1 und 2 dargestellten Ausführungsform ist jedoch hier der längere Sitzabschnitt freitragend, d.h. nicht mit der Rückenlehne verbunden.On its front edge, the crossmember 15 carries a pivot axis A1, on which the seat 12 is suspended in such a way that it can also perform a rocking movement about the axis A1 in the manner of a two-armed lever. In contrast to the embodiment shown in Figs. 1 and 2, however, the longer seat section is self-supporting, i.e. not connected to the backrest.

Die Rückenlehne 13, welche beispielsweise wiederum aus einer elastischen Kunststoffplatte 16 und verstärkenden Stahlbändern 17 bestehen kann, ist an ihrem unteren Ende an der Traverse 15 so verankert, dass sie sich um eine an der Traverse befindliche Achse A3 verschwenken lässt. An der Rückseite der Rückenlehne 13 ist auch hier, im Abstand b oberhalb einer durch die Achse A1 gedachten Horizontalebene (entsprechend der Lage der Lendenwirbel) und im Abstand a von der Rückenlehne selbst, eine Schwenkachse A2 befestigt. An dieser greift ein Betätigungsgestänge 18 an, das vom vorderen Sitzabschnitt ausgehend beidseits und oberhalb des Sitzes verläuft und damit gleichzeitig einerseits die Armlehnen des Stuhles bildet, andererseits das Verbindungsglied zwischen Rückenlehne und Sitz darstellt.The backrest 13, which in turn can consist, for example, of an elastic plastic plate 16 and reinforcing steel strips 17, is on anchored its lower end to the cross member 15 in such a way that it can be pivoted about an axis A3 located on the cross member. On the back of the backrest 13, a pivot axis A2 is also attached here, at a distance b above a horizontal plane through the axis A1 (corresponding to the position of the lumbar vertebrae) and at a distance a from the backrest itself. This is actuated by an actuating linkage 18 which extends from the front seat section on both sides and above the seat and thus simultaneously forms the armrests of the chair on the one hand, and on the other hand represents the connecting link between the backrest and the seat.

Das Betätigungsgestänge 18 umfasst zwei Betätigungshebel, welche von der schwenkachse A1 ausgehen und beidseits derselben an der Sitzunterseite starr befestigt sind. Die Achse A1 kann beispielsweise ein Rohr sein, in dem die Enden der beiden Betätigungshebel 18 drehbar gelagert sind.The actuating linkage 18 comprises two actuating levers which start from the pivot axis A1 and are rigidly attached to the underside of the seat on both sides thereof. The axis A1 can be, for example, a tube in which the ends of the two actuating levers 18 are rotatably mounted.

Bei Belastung der Rückenlehne wird sich dieselbe auch bei dieser Ausführungsform so verformen (vgl. gestrichelte Kontur), dass die Achse A2 um ein entsprechendes Mass abgesenkt wird, da sie sich auf einem Kreisbogen mit dem Radius A₁-A₂ bewegt. Diese Absenkbewegung der Achse A2 wird nun über die Armlehnen 18 auf den vorderen Sitzabschnitt übertragen, der sich leicht anhebt und dadurch die gewünschte Absenkbewegung des hinteren Sitzabschnittes bewirkt. Die mit der Durchbiegung der Rückenlehne verbundene Ausbauchung derselben im unteren Rückenlehnenabschnitt 13a (Fig. 4) wird durch die Anordnung der Achse A3 aufgenommen.When the backrest is loaded, the same will deform in this embodiment (see dashed outline) that the axis A2 is lowered by a corresponding amount, since it moves on a circular arc with the radius A₁-A₂. This lowering movement of the axis A2 is now transmitted via the armrests 18 to the front seat section, which rises slightly and thereby brings about the desired lowering movement of the rear seat section. The bulge of the same in the lower backrest section 13a (FIG. 4) associated with the deflection of the backrest is absorbed by the arrangement of the axis A3.

Die anhand der Fig. 1 bis 4 dargestellten Achsen A1, A2 und A3 können vom Fachmann in bekannter Weise, z.B. als Drehzapfen, als Scharniere etc. ausgebildet sein.The axes A1, A2 and A3 illustrated with the aid of FIGS. be designed as a pivot, as hinges, etc.

Claims (8)

1. A chair having a frame, a seat (2, 12) which is supported on the frame in the region of the free, front end portion of said seat by means of a first horizontal spindle (A1) and is pivotable about this spindle in the manner of a two-armed lever, and having a backrest (3, 13) which is substantially vertical in its rest position but which is capable of being moved backwards under a load said backrest (3, 13) being connected to the seat (2, 12) in such a way that any movement of the backrest (3, 13) out of its vertical position causes a corresponding lowering of the seat portion adjacent the backrest (3, 13), a second horizontal spindle (A2) being secured to the backrest (3, 13) on that side of the backrest (3, 13) which is remote from the seat (2, 12), at a vertical spacing (b) above said first spindle (A1), the seat (2, 12) being coupled to said second spindle (A2) in such a way that the lowering of the said second spindle (A2) resulting from the tilting of the backrest (3, 13) is transmitted directly or indirectly to the seat portion adjacent the backrest (3,13), characterised in that the backrest (3,13), which is clamped at its lower end and projects upwardly as a free support is of a resilient elastic construction, at least in that part which is situated below said second spindle (A2).
2. A chair according to claim 1, characterised in that the seat (2) has a rigid support fame (8) which is hinged at one end to said second spindle (A2).
3. A chair according to claim 1, characterised in that two actuating levers (18) act on said first spindle (A1), on both sides thereof, said levers (18) being fixedly connected to the underside of the seat, on the one hand, and being guided on both sides of and above the seat (12) as far as the second spindle (A2), on the other hand, and simultaneously forming the armrests of the chair.
4. A chair according to claim 2, characterised in that the backrest (3) extends as far as the bottommost support plane of the chair and thus simultaneously forms an integral part of the frame (1) which supports the chair.
5. Chair according to claim 4, characterised in that fixed to the lower edge of the backrest (3) are feet (4) which are raised in the region of the front edge of the seat, where they support said first spindle (A1).
6. Chair according to any of claims 1 to 5, characterised in that the backrest (3/13) is pivotable about a third spindle (A3) mounted on the lower end portion thereof.
7. Chair according to any of claims 1 to 6, characterised in that the backrest (3, 13) has a resiliently flexible plastics sheet reinforced with vertically or longitudinally extending steel strips.
8. Chair according to any of claims 1 to 7, characterised in that said second spindle (A2) is at a horizontal spacing (a) from the backrest (3/13).
EP88810371A 1987-06-09 1988-06-07 Chair Expired - Lifetime EP0295214B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88810371T ATE67381T1 (en) 1987-06-09 1988-06-07 SEATING.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2161/87 1987-06-09
CH2161/87A CH672882A5 (en) 1987-06-09 1987-06-09

Publications (2)

Publication Number Publication Date
EP0295214A1 EP0295214A1 (en) 1988-12-14
EP0295214B1 true EP0295214B1 (en) 1991-09-18

Family

ID=4227301

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88810371A Expired - Lifetime EP0295214B1 (en) 1987-06-09 1988-06-07 Chair

Country Status (9)

Country Link
US (1) US4880272A (en)
EP (1) EP0295214B1 (en)
JP (1) JPS63317104A (en)
AT (1) ATE67381T1 (en)
AU (1) AU599292B2 (en)
CA (1) CA1293683C (en)
CH (1) CH672882A5 (en)
DE (2) DE8806924U1 (en)
DK (1) DK310488A (en)

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US5383712A (en) * 1988-04-25 1995-01-24 Perry; Charles O. Flexible chair
ES2118081T3 (en) * 1990-04-10 1998-09-16 Charles O Perry FLEXIBLE STACKABLE CHAIR IN LARGE QUANTITY.
WO1992005726A1 (en) * 1990-10-01 1992-04-16 Achim Steinmeier Dismantlable chair
DE4236834C2 (en) * 1991-11-02 2002-09-05 Gotthard Bresch seating
DE4210283C1 (en) * 1992-03-28 1993-04-01 Martin Stoll Gmbh, 7890 Waldshut-Tiengen, De
WO1994027472A1 (en) * 1993-06-02 1994-12-08 Sava Cvek Articulated support chair
ES2110874B1 (en) * 1994-04-21 1998-11-16 Jevit Manufact Metalicas Sa SEAT FURNITURE.
DE4428244A1 (en) * 1994-08-10 1996-02-22 Desanta Chair connectable into row of seats
US6224159B1 (en) 1999-05-12 2001-05-01 Charles Owen Perry Flexible chair which can be disassembled to a flat configuration
US6412869B1 (en) 1999-05-27 2002-07-02 Steelcase Development Corporation Nestable synchrotilt chair
FI108842B (en) * 1999-11-17 2002-04-15 Martela Oyj Chair
WO2002060299A1 (en) * 2001-01-31 2002-08-08 Radmilo Eric A self-adjusting general-purpose chair with a cantilever type seat fixed on the front side of the seat
US7226127B1 (en) * 2005-12-21 2007-06-05 Tk Canada Limited Ergonomic chair backrest
US7806478B1 (en) 2006-01-04 2010-10-05 Sava Cvek Task chair with dual tilting capabilities
US9480339B2 (en) 2012-12-31 2016-11-01 Sava Cvek Seat with pelvic support
CA3091345C (en) * 2018-02-16 2022-10-18 Barrett Studios, Inc. Chair assembly
FR3081691B1 (en) * 2018-06-01 2022-11-04 Martin Veith CHAIR WITH IMPROVED COMFORT
DE202018103738U1 (en) * 2018-06-29 2019-10-09 Armin Sander Seating, in particular free-swinging chair
IT202100006467A1 (en) * 2021-03-18 2022-09-18 Pro Cord Spa CHAIR WITH OSCILLATING SEAT AND BACK

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US2557671A (en) * 1951-06-19 Mcdonald
US169065A (en) * 1875-10-19 Improvement in chairs
DE88021C (en) *
AT147750B (en) * 1935-01-21 1936-11-10 Hermann Franz Donath Seating.
DE675688C (en) * 1936-03-26 1939-05-13 Andreas Gaal Cantilever seating and reclining furniture frame
US2439869A (en) * 1944-11-14 1948-04-20 Renwick J Sharp Adjustable spring supported chair
DE832053C (en) * 1950-12-24 1952-02-21 Paul Bode Frame for seating such as armchairs and chairs
US2961035A (en) * 1954-05-26 1960-11-22 Lorenz Anton Article of repose for supporting the body of a person
FR77026E (en) * 1957-10-09 1962-01-08 Seat or other items such as sofa, etc.
EP0136374B1 (en) * 1983-10-05 1987-06-16 Giroflex-Entwicklungs AG Chair with an inclinable seat and back-rest

Also Published As

Publication number Publication date
JPS63317104A (en) 1988-12-26
DE8806924U1 (en) 1988-07-07
CH672882A5 (en) 1990-01-15
DE3864913D1 (en) 1991-10-24
DK310488A (en) 1988-12-10
AU1666088A (en) 1988-12-15
DK310488D0 (en) 1988-06-08
EP0295214A1 (en) 1988-12-14
AU599292B2 (en) 1990-07-12
CA1293683C (en) 1991-12-31
US4880272A (en) 1989-11-14
ATE67381T1 (en) 1991-10-15

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