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EP0085670B1 - Chair - Google Patents

Chair Download PDF

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Publication number
EP0085670B1
EP0085670B1 EP81902299A EP81902299A EP0085670B1 EP 0085670 B1 EP0085670 B1 EP 0085670B1 EP 81902299 A EP81902299 A EP 81902299A EP 81902299 A EP81902299 A EP 81902299A EP 0085670 B1 EP0085670 B1 EP 0085670B1
Authority
EP
European Patent Office
Prior art keywords
seat
movement
back rest
pair
backrest
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
Application number
EP81902299A
Other languages
German (de)
French (fr)
Other versions
EP0085670A1 (en
Inventor
Hermann Locher
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.)
Giroflex Entwicklungs AG
Original Assignee
Giroflex Entwicklungs AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Giroflex Entwicklungs AG filed Critical Giroflex Entwicklungs AG
Priority to AT81902299T priority Critical patent/ATE12168T1/en
Publication of EP0085670A1 publication Critical patent/EP0085670A1/en
Application granted granted Critical
Publication of EP0085670B1 publication Critical patent/EP0085670B1/en
Expired 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
    • A47C1/03255—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
    • 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
    • A47C1/03211—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 electric motors
    • 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
    • A47C1/03283—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with fluid springs

Definitions

  • the invention relates to a chair according to the preamble of claim 1.
  • the invention now aims to avoid this relative movement or at least to reduce it in such a way that it is no longer noticeable.
  • a chair of the type mentioned is characterized according to the invention by the features of the characterizing part of the claim.
  • FIG. 1 shows a possible embodiment of such a known chair.
  • the standpipe of the chair is called.
  • This has a seat support 2 with tabs 3 (only one visible) which contain an axis of rotation 4 for the seat 5 formed from pins or the like.
  • Standpipe 1, seat support 2, tabs 3 and thus also the axis of rotation 4 are to be regarded as stationary for the following explanations; they are therefore also shown in this figure as if they formed a single part.
  • the seat 5 is the first of the movable parts in that it can be pivoted about the axis of rotation 4.
  • the solid line shows the seat in its normal position; the dashed line, marked 5 ', shows it in its tilted or inclined position, into which it can be brought by a leaning user.
  • the pivot angle between the starting position 5 and the inclined position 5 ' is denoted by a.
  • the seat has a pivot axis 6 at its rear end. A further movable part is attached to this, namely the backrest, which is denoted overall by 7, is pivotable. It continues below the pivot axis 6 in a guide part 8 consisting of two parallel supports (only one support visible in FIG. 1). This is rigidly connected to the backrest 7.
  • the seat 5 is not only pivotable about the axis of rotation 4, but is also mounted in a longitudinally displaceable manner, as will be shown on the basis of the following explanations.
  • the guide part 8 can namely be pivoted about a pivot axis 9a attached to the rigid seat support 2, and since it is consequently stationary, it forms the center of the pivoting movement of all movable parts, i.e. the seat 5, the backrest 7 and the guide part 8 together with the pivot axis 6 it follows from this, in particular when looking at FIG. 1, that the seat not only pivots about the axis of rotation 4, but also has to move along the same, which is made possible by suitable means, usually by elongated holes.
  • a piston rod 10 of a cylinder-piston unit usually a gas spring 11 of a commercially available type, which must also be pivotably mounted due to the movement of the pivot axis 6, specifically at the upper end of the standpipe 1.
  • the pivot axis 6 also changes its position as mentioned; the new location is designated 6 '. In doing so, she travels a distance labeled a.
  • the guide part 8 also changes its position, since it carries the pivot axis 6. Its new layer 8 'forms an angle with the old layer 8 which is larger than the angle a. Since the backrest 7 is rigidly connected to the guide part 8, it also changes its position to the same extent. It also swivels from 7 to 7 'by this angle, which is denoted by ⁇ . She points So in this position to the seat at a larger angle than in the starting position.
  • Fig. 2 shows schematically some structural details.
  • the seat 5 is shown partially broken away to show the underlying organs. It can be seen that the seat support 2 widens considerably at its front end, that is to say it is T-shaped, in order to carry one tab 3 each.
  • the axis of rotation 4 can consist of two short swivel shafts about which the seat 5 can swing.
  • the pivot axis 6, however, is continuous because of the bearing of the piston rod 10; it is attached to the underside of the seat 5 in a known and therefore not shown manner.
  • the guide part 8 consisting of the two mentioned supports, and the backrest 7 are rigidly connected to one another, these parts are shown as a single part.
  • the backrest 7 not only makes a circular pivoting movement, but also lowers by the distance a. If you consider a point on the backrest, for example the upper end E, it moves according to the arrows 12 to the position E '.
  • FIG. 3 the same parts as in FIG. 1 can initially be seen.
  • the backrest 7 has changed somewhat, as will be explained.
  • the position of the gas spring 11 has also changed. It is now pivotally attached to the seat support 2.
  • an approximately L-shaped pair of transmission levers 13 (only one lever can be seen in FIG. 3) and a driver bow 14 have been newly added.
  • the pair of transmission levers 13 has three articulation points.
  • each of the L-shaped levers With the short leg 13a of each of the L-shaped levers, the pair of levers is articulated on the pivot axis 9 of the guide part 8 and on the piston rod 10 of the gas spring.
  • Another articulation point is designated 15; this is the actual axis of rotation, which is fixedly attached to immovable seat support 2 and about which the pair of transmission levers 13 rotates.
  • the last articulation point 16 is located on the longer leg 1 3b of each lever and is formed by an axis with which the driver bow 14 is articulated on the transmission lever pair 13 (FIG. 4).
  • the driver bow 14 a rigid, curved, elongated plate, is articulated on a backrest plate 70 at its other end. Details can be found above all in FIG. 5, which is yet to be explained.
  • This backrest plate 70 is slidably supported by sliders 71 on a guide consisting of two guide rails 72, which form a direct continuation of each support of the guide part 8. 5, the sliders 71 have a recess 73 into which a projecting rib 74 of each guide rail 72 engages.
  • the driver bow 14 is connected to the backrest plate 70 in an articulated manner via a pivot axis 17, this pivot axis passing through two tabs 75 rigidly attached to the plate.
  • the embodiment shown here shows thus a mechanical adjustment device. It goes without saying that other adjustment devices, for example hydraulic or electrical, could also be used to bring about the same effect. It should also be pointed out that, especially when using such adjustment devices, a reverse relative movement between the backrest and the seat can also take place, in that the latter is raised at the inclination while the backrest or the backrest plate merely inclines. By lifting the seat, the same relative displacement between the seat and the backrest results in this case as in the example shown.

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  • Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Chairs Characterized By Structure (AREA)
  • Chairs For Special Purposes, Such As Reclining Chairs (AREA)
  • Chair Legs, Seat Parts, And Backrests (AREA)
  • Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
  • Finger-Pressure Massage (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
  • Control Of El Displays (AREA)

Abstract

A reclining chair is disclosed containing a conventional seat portion pivotable about a fixed pivot shaft or axle and a backrest containing a backrest plate displaceable upon guide rails. These guide rails are pivoted to a greater extent than the seat during the rearward reclining of the seat, due to the action of a guide element connected with a piston rod of a pneumatic spring arrangement. Due to the movement of the guide element there is rotated a transmission lever pair about a stationary pivot shaft, the transmission lever pair being connected with the guide element. A curved entrainment member, hingedly connected with this transmission lever pair, is connected with the backrest plate. Since a pivot shaft between the transmission lever pair and the curved entrainment member moves through an appreciably larger distance than the connection location between the seat and the guide element or the guide rails, the backrest plate is downwardly drawn along the guide rails. By virtue of this adjustment mechanism there is ensured that the backrest plate follows that course of movement which is performed by the back of the user during reclining of the chair.

Description

Die Erfindung betrifft einen Stuhl gemäss dem Oberbegriff des Anspruchs 1.The invention relates to a chair according to the preamble of claim 1.

Stühle, hauptsächlich Bürostühle, dieser Art sind seit einiger Zeit bekannt. Sie bieten einen beachtlichen Sitzkomfort, da sie einerseits in der Ausgangs- oder Arbeitsstellung dank der praktisch senkrechten Rückenlehne eine gute Stützung des Rückens des Benützers ergeben, andererseits aber in der nach rückwärts geneigten Lage ein entspanntes Sitzen (sogenannte Relaxstellung) ermöglichen.Chairs, mainly office chairs, of this type have been known for some time. They offer remarkable seating comfort, because on the one hand they provide good support for the back of the user in the starting or working position thanks to the practically vertical backrest, but on the other hand they allow relaxed sitting (so-called relax position) in the reclined position.

Stühle ähnlicher Art weisen folgenden Nachteil auf. Wenn der Winkel zwischen dem Sitz und der Rückenlehne sich aufweitet, macht der Oberkörper des Benützers nicht einfach eine Schwenkbewegung, sondern es findet eine aus verschiedenen Bewegungen überlagerte resultierende Bewegung statt. Das Ergebnis ist, dass der Rücken des Benützers beim Zurückkippen der Lehne eine Bewegung ausführt, bei welcher jede einzelne Stelle des Rückens eine ziemlich steil nach unten abfallende Kurve durchläuft. Die Rückenlehne kann aber dieser Bewegung nicht folgen. Zwar bewegt sie sich, da sie am rückwärtigen Ende des Sitzes angebracht ist und dieses Ende beim Kippen nach unten schwenkt, ebenfalls nach unten, während sie gleichzeitig die Schwenkbewegung ausführt. Ihre Bewegungskurve ist jedoch weniger steil, so dass eine Relativbewegung zwischen Rücken und Lehne auftritt.Chairs of a similar type have the following disadvantage. When the angle between the seat and the backrest widens, the upper body of the user does not simply make a swiveling movement, but instead there is a resulting movement superimposed on various movements. The result is that when the back of the back is tilted, the user's back performs a movement in which every single point on the back runs through a fairly steep downward curve. However, the backrest cannot follow this movement. Since it is attached to the rear end of the seat and pivots this end when it is tilted down, it also moves downwards while simultaneously performing the pivoting movement. However, their movement curve is less steep, so that there is a relative movement between the back and the backrest.

Die Erfindung bezweckt nun, diese Relativbewegung zu vermeiden oder wenigstens derart zu reduzieren, dass sie nicht mehr bemerkbar ist.The invention now aims to avoid this relative movement or at least to reduce it in such a way that it is no longer noticeable.

Ein Stuhl der eingangs erwähnten Art ist erfindungsgemäss durch die Merkmale des kennzeichnenden Teils des Anspruchs gekennzeichnet.A chair of the type mentioned is characterized according to the invention by the features of the characterizing part of the claim.

Die Erfindung wird anhand der beiliegenden Zeichnungen beispielsweise näher erläutert; es zeigen :

  • Fig. 1 eine schematische Darstellung eines Stuhles der bisher bekannten Art und seiner Wirkungsweise,
  • Fig. 2 eine Aufsicht auf diesen Stuhl, unter teilweiser Wegbrechung des Sitzes,
  • Fig. 3 die gleiche Darstellung wie in Fig. 1, aber für den erfindungsgemässen Stuhl,
  • Fig. 4 eine gleiche Ansicht wie Fig. 2, aber auf den Stuhl gemäss Fig. 3, und
  • Fig. 5 eine perspektivische Darstellung der Führung der beweglichen Rückenlehnenplatte.
The invention is explained in more detail with reference to the accompanying drawings, for example; show it :
  • 1 is a schematic representation of a chair of the previously known type and its mode of operation,
  • 2 is a top view of this chair, with the seat partially broken away,
  • 3 shows the same representation as in FIG. 1, but for the chair according to the invention,
  • Fig. 4 is a same view as Fig. 2, but on the chair according to Fig. 3, and
  • Fig. 5 is a perspective view of the leadership of the movable backrest plate.

Um den Bewegungsablauf und die Wirkungsweise des Stuhles besser zu verstehen, soll vorerst anhand von Fig. 1 erläutert werden, wie ein Stuhl der bisher bekannten Artfunktioniert. Die schematische Darstellung zeigt eine mögliche Ausführungsform eines solchen bekannten Stuhles. Mit 1 ist das Standrohr des Stuhles bezeichnet. Dieses weist einen Sitzträger 2 mit Laschen 3 (nur eine sichtbar) auf, die eine aus Stiften oder dergleichen gebildete Drehachse 4 für den Sitz 5 enthalten. Standrohr 1, Sitzträger 2, Laschen 3 und damit auch die Drehachse4 sind für die folgenden Erläuterungen als stationär zu betrachten; sie sind daher in dieser Figur auch so dargestellt, als ob sie einen einzigen Teil bilden würden. Der Sitz 5 ist der erste der beweglichen Teile, indem er um die Drehachse 4 schwenkbar ist. Die voll ausgezogene Linie zeigt den Sitz in seiner Normallage; die gestrichelte Linie, mit 5' markiert, zeigt ihn in seiner zurückgekippten oder geneigten Lage, in die er durch einen sich zurücklehnenden Benützer gebracht werden kann. Der Schwenkwinkel zwischen der Ausgangslage 5 und der geneigten Lage 5' ist mit a bezeichnet. An seinem hinteren Ende weist der Sitz eine Schwenkachse 6 auf. An dieser ist ein weiterer beweglicher Teil, nämlich die gesamthaft mit 7 bezeichnete Rückenlehne schwenkbar angebracht. Sie setzt sich unterhalb der Schwenkachse 6 in einen aus zwei parallelen Trägern (in Fig. 1 nur ein Träger sichtbar) bestehenden Führungsteil 8 fort. Dieser ist also mit der Rückenlehne 7 starr verbunden. Der Sitz 5 ist übrigens um die Drehachse 4 nicht nur schwenkbar, sondern auch längsverschieblich gelagert, wie anhand der folgenden Ausführungen gezeigt wird. Der Führungsteil 8 ist nämlich um eine am starren Sitzträger 2 angebrachte Schwenkachse 9a schwenkbar, und da diese demzufolge ortsfest ist, bildet sie das Zentrum der Schwenkbewegung aller beweglichen Teile, also des Sitzes 5, der Rückenlehne 7 und des Führungsteils 8 samt Schwenkachse 6. Es folgt daraus, insbesondere bei Betrachtung der Fig. 1, dass der Sitz um die Drehachse 4 nicht nur schwenkt, sondern sich auch entlang derselben verschieben muss, was durch geeignete Mittel, meistens durch Langlöcher, ermöglicht wird.In order to better understand the sequence of movements and the mode of operation of the chair, it should first be explained with reference to FIG. 1 how a chair of the previously known type functions. The schematic representation shows a possible embodiment of such a known chair. With 1 the standpipe of the chair is called. This has a seat support 2 with tabs 3 (only one visible) which contain an axis of rotation 4 for the seat 5 formed from pins or the like. Standpipe 1, seat support 2, tabs 3 and thus also the axis of rotation 4 are to be regarded as stationary for the following explanations; they are therefore also shown in this figure as if they formed a single part. The seat 5 is the first of the movable parts in that it can be pivoted about the axis of rotation 4. The solid line shows the seat in its normal position; the dashed line, marked 5 ', shows it in its tilted or inclined position, into which it can be brought by a leaning user. The pivot angle between the starting position 5 and the inclined position 5 'is denoted by a. The seat has a pivot axis 6 at its rear end. A further movable part is attached to this, namely the backrest, which is denoted overall by 7, is pivotable. It continues below the pivot axis 6 in a guide part 8 consisting of two parallel supports (only one support visible in FIG. 1). This is rigidly connected to the backrest 7. Incidentally, the seat 5 is not only pivotable about the axis of rotation 4, but is also mounted in a longitudinally displaceable manner, as will be shown on the basis of the following explanations. The guide part 8 can namely be pivoted about a pivot axis 9a attached to the rigid seat support 2, and since it is consequently stationary, it forms the center of the pivoting movement of all movable parts, i.e. the seat 5, the backrest 7 and the guide part 8 together with the pivot axis 6 it follows from this, in particular when looking at FIG. 1, that the seat not only pivots about the axis of rotation 4, but also has to move along the same, which is made possible by suitable means, usually by elongated holes.

Ebenfalls an der Schwenkachse 6 angelenkt ist eine Kolbenstange 10 eines Zylinderkolbenaggregates, üblicherweise einer Gasfeder 11 von handelsüblicher Bauart, die wegen der Bewegung der Schwenkachse 6 ebenfalls schwenkbar gelagert sein muss, und zwar am oberen Ende des Standrohres 1. Da der Abstand des Gasfederschwenkpunktes 11 a von der Schwenkachse 6 geringer ist als der konstante Abstand der Schwenkachsen 9a und 6 voneinander und dieser Schwenkpunkt 11 a zudem neben der Verbindungslinie der beiden genannten Schwenkachsen liegt, verkürzt sich sein Abstand von der Schwenkachse 6 bei der Rückwärtsbewegung bzw. bei der Lageänderung der letzteren; die Gasfeder 11 wird also komprimiert, wobei sie wie üblich in jeder Stellung ihres Kolbens blockierbar ist, und dadurch ergibt sich auch die federnde Wirkung beim Rückwärtslehnen.Also articulated on the pivot axis 6 is a piston rod 10 of a cylinder-piston unit, usually a gas spring 11 of a commercially available type, which must also be pivotably mounted due to the movement of the pivot axis 6, specifically at the upper end of the standpipe 1. Since the distance of the gas spring pivot point 11 a from the pivot axis 6 is less than the constant distance of the pivot axes 9a and 6 from each other and this pivot point 11a is also next to the connecting line of the two mentioned pivot axes, its distance from the pivot axis 6 shortens during the backward movement or when changing the position of the latter; the gas spring 11 is thus compressed, whereby it can be locked as usual in any position of its piston, and this also results in the resilient effect when leaning backward.

Schwenkt also bei dieser Rückwärtsbewegung der Sitz von 5 nach 5', so ändert wie erwähnt die Schwenkachse 6 ihre Lage ebenfalls; die neue Lage ist mit 6' bezeichnet. Hierbei legt sie eine Strecke zurück, die mit a bezeichnet ist. Durch diese Bewegung ändert auch der Führungsteil 8 seine Lage, da er ja die Schwenkachse 6 trägt. Seine neue Lage 8' bildet mit der alten Lage 8 einen Win - kel, welcher grösser als der Winkel a ist. Da die Rückenlehne 7 starr mit dem Führungsteil 8 verbunden ist, ändert auch sie ihre Lage im gleichen Ausmass. Auch sie schwenkt um diesen Winkel, der mit ß bezeichnet ist, von 7 nach 7'. Sie weist also in dieser Lage zum Sitz einen grösseren Winkel auf als in der Ausgangsstellung.If the seat pivots from 5 to 5 'during this backward movement, the pivot axis 6 also changes its position as mentioned; the new location is designated 6 '. In doing so, she travels a distance labeled a. As a result of this movement, the guide part 8 also changes its position, since it carries the pivot axis 6. Its new layer 8 'forms an angle with the old layer 8 which is larger than the angle a. Since the backrest 7 is rigidly connected to the guide part 8, it also changes its position to the same extent. It also swivels from 7 to 7 'by this angle, which is denoted by β. She points So in this position to the seat at a larger angle than in the starting position.

Fig. 2 zeigt schematisch einige konstruktive Einzelheiten. Der Sitz 5 ist teilweise weggebrochen dargestellt, um die darunterliegenden Organe zu zeigen. Man erkennt, dass der Sitzträger 2 sich an seinem vorderen Ende stark verbreitert, also T-förmig ist, um je eine Lasche 3 zu tragen. Die Drehachse 4 kann wie dargestellt aus zwei kurzen Schwenkwellen bestehen, um welche der Sitz 5 schwingen kann. Die Schwenkachse 6 ist hingegen wegen der Lagerung der Kolbenstange 10 durchgehend; sie ist in bekannter und daher nicht näher dargestellter Weise an der Unterseite des Sitzes 5 befestigt. Um zu zeigen, dass der Führungsteil 8, bestehend aus den zwei erwähnten Trägern, und die Rückenlehne 7 starr miteinander verbunden sind, sind diese Teile als ein einziger Teil dargestellt.Fig. 2 shows schematically some structural details. The seat 5 is shown partially broken away to show the underlying organs. It can be seen that the seat support 2 widens considerably at its front end, that is to say it is T-shaped, in order to carry one tab 3 each. As shown, the axis of rotation 4 can consist of two short swivel shafts about which the seat 5 can swing. The pivot axis 6, however, is continuous because of the bearing of the piston rod 10; it is attached to the underside of the seat 5 in a known and therefore not shown manner. In order to show that the guide part 8, consisting of the two mentioned supports, and the backrest 7 are rigidly connected to one another, these parts are shown as a single part.

Anhand von Fig. 1 ist somit ersichtlich, dass die Lehne 7 nicht nur eine kreisförmige Schwenkbewegung macht, sondern sich auch noch um die Distanz a absenkt. Betrachtet man einen Punkt der Lehne, beispielsweise das obere Ende E, so wandert dieser gemäss den eingetragenen Pfeilen 12 zur Stelle E'.1 that the backrest 7 not only makes a circular pivoting movement, but also lowers by the distance a. If you consider a point on the backrest, for example the upper end E, it moves according to the arrows 12 to the position E '.

Nun lässt sich aber beweisen, dass der menschliche Rücken nicht die selbe Bewegung macht. Vielmehr vollführt er eine Bewegung, bei welcher eine entsprechende Stelle, die beispielsweise auf dem genannten Punkt E aufliegt, beim Rückwärtsneigen des Stuhles zu einem Punkt E" wandert, der wesentlich tiefer liegt als der Punkt E'. Die Lehne 7 hat also, relativ zum Rücken betrachtet, eine Bewegung nach oben durchgeführt. Diese Relativverschiebung, die wegen ihrer Wirkung auf männliche Benützer in der Fachsprache als "Hemdauszieheffekt" bezeichnet wird, soll nun durch den erfindungsgemässen Stuhl vermieden werden. Dies wird anhand der Fig. 3 und 4 erläutert.Now it can be proven that the human back does not make the same movement. Rather, it executes a movement in which a corresponding point, which rests, for example, on said point E, moves to a point E "when the chair is tilted back, which point is substantially lower than point E '. The backrest 7 thus has, relative to This relative shift, which is referred to in technical terms as " shirt pull-out effect" because of its effect on male users, is now to be avoided by the chair according to the invention. This is explained with reference to FIGS.

In Fig. 3 sind vorerst die selben Teile wie in Fig. 1 erkennbar. Die Rückenlehne 7 hat sich etwas geändert, wie noch erläutert wird. Geändert hat sich auch die Lage der Gasfeder 11. Sie ist nun schwenkbar am Sitzträger 2 befestigt. Weggefallen ist die Anlenkung des Führungsteils 8 am Sitzträger 2, also die Schwenkachse 9a; sie wird durch eine Schwenkachse 9 am Ende des Führungsteils 8 ersetzt. Neu hinzugekommen sind hingegen ein annähernd L-förmiges Übersetzungshebelpaar 13 (in Fig. 3 nur ein Hebel ersichtlich) und ein Mitnehmerbogen 14. Das Übersetzungshebelpaar 13 hat drei Anlenkstellen. Mit dem kurzen Schenkel 13a jedes der L-förmigen Hebel ist das Hebelpaar an der Schwenkachse 9 des Führungsteils 8 und an der Kolbenstange 10 der Gasfeder angelenkt. Eine weitere Anlenkstelle ist mit 15 bezeichnet; diese ist die eigentliche Drehachse, die ortsfest an unbeweglichen Sitzträger 2 angebracht ist und um welche das Übersetzungshebelpaar 13 sich dreht. Die letzte Anlenkstelle 16 befindet sich am längeren Schenkel 1 3b jedes Hebels und ist durch eine Achse gebildet, mit welcher der Mitnehmerbogen 14 am Übersetzungshebelpaar 13 angelenkt ist (Fig. 4).3, the same parts as in FIG. 1 can initially be seen. The backrest 7 has changed somewhat, as will be explained. The position of the gas spring 11 has also changed. It is now pivotally attached to the seat support 2. The articulation of the guide part 8 on the seat support 2, that is to say the pivot axis 9a; it is replaced by a pivot axis 9 at the end of the guide part 8. On the other hand, an approximately L-shaped pair of transmission levers 13 (only one lever can be seen in FIG. 3) and a driver bow 14 have been newly added. The pair of transmission levers 13 has three articulation points. With the short leg 13a of each of the L-shaped levers, the pair of levers is articulated on the pivot axis 9 of the guide part 8 and on the piston rod 10 of the gas spring. Another articulation point is designated 15; this is the actual axis of rotation, which is fixedly attached to immovable seat support 2 and about which the pair of transmission levers 13 rotates. The last articulation point 16 is located on the longer leg 1 3b of each lever and is formed by an axis with which the driver bow 14 is articulated on the transmission lever pair 13 (FIG. 4).

Der Mitnehmerbogen 14, eine starre, gebogene längliche Platte, ist an seinem anderen Ende an einer Rückenlehnenplatte 70 angelenkt. Einzelheiten sind vor allem der noch zu erläuternden Fig. 5 zu entnehmen. Diese Rückenlehnenplatte 70 ist mittels Gleitern 71 an einer aus zwei Führungsschienen 72, welche eine direkte Fortsetzung jedes Trägers des Führungsteils 8 bilden, bestehenden Führung gleitend gelagert. Gemäss Fig. 5 weisen die Gleiter 71 eine Vertiefung 73 auf, in welche eine vorstehende Rippe 74 jeder Führungsschiene 72 angreift. Vor allem aus dieser Figur ist auch ersichtlich, dass der Mitnehmerbogen 14 über eine Schwenkachse 17 gelenkig mit der Rückenlehnenplatte 70 verbunden ist, wobei diese Schwenkachse durch zwei starr an der Platte angebrachte Laschen 75 hindurchführt.The driver bow 14, a rigid, curved, elongated plate, is articulated on a backrest plate 70 at its other end. Details can be found above all in FIG. 5, which is yet to be explained. This backrest plate 70 is slidably supported by sliders 71 on a guide consisting of two guide rails 72, which form a direct continuation of each support of the guide part 8. 5, the sliders 71 have a recess 73 into which a projecting rib 74 of each guide rail 72 engages. Above all, it can also be seen from this figure that the driver bow 14 is connected to the backrest plate 70 in an articulated manner via a pivot axis 17, this pivot axis passing through two tabs 75 rigidly attached to the plate.

Die Wirkungsweise soll nun anhand von Fig. 3 erläutert werden. Neigt sich der Sitz 5, so ändert der Führungsteil 8 seine Lage nach 8', wie schon erläutert. Weil nun aber das Übersetzungshebelpaar 13 mit ihm über die Schwenkachse 9 verbunden ist, hat die Verlagerung dieser Schwenkachse 9 nach 9' eine Mitnahme jedes Schenkels 13a zur Folge. Wegen der ortsfesten Drehachse 15 verdreht sich somit das Hebelpaar 13 um dieselbe. Die Enden der Schenkel 13a vollführen daher eine Kreisbewegung. Es ist deshalb notwendig, auch hier die Gasfeder gelenkig zu lagern. Die Schwenkbewegung der Gasfeder 11 ist aber, wie aus Fig. 3 ersichtlich, wegen der relativen Lage der Kolbenstange 10 zu den Schenkeln 13a sehr minim, so dass dies auf die Bewegung des Führungsteils 8 praktisch ohne Einfluss bleibt.The mode of operation will now be explained with reference to FIG. 3. If the seat 5 tilts, the guide part 8 changes its position to 8 ', as already explained. However, because the pair of translation levers 13 is now connected to it via the pivot axis 9, the displacement of this pivot axis 9 to 9 'results in entrainment of each leg 13a. Because of the fixed axis of rotation 15, the pair of levers 13 thus rotates about the same. The ends of the legs 13a therefore perform a circular movement. It is therefore necessary to also articulate the gas spring. 3, because of the relative position of the piston rod 10 to the legs 13a, the pivoting movement of the gas spring 11 is very minimal, so that this has practically no influence on the movement of the guide part 8.

Die Drehbewegung der Übersetzungshebel 13 hat nun aber zur Folge, dass wegen der ungleichen Länge der beiden Schenkel 13a, 13b jedes Hebels die Enden der Schenkel 1 3b eine ungleich grössere, also übersetzte Bewegung ausführen. Damit vollführt die Anlenkstelle 16 eine kreisförmige Bewegung um die Anlenkstelle 15 als Mittelpunkt und legt hierbei eine Distanz zurück, die in Fig. 3 mit b bezeichnet ist. Man ersieht sofort, dass diese Distanz b erheblich grösser als die Distanz a (Bewegung von 6 nach 6', Fig. 1) ist. Der Mitnehmerbogen 14 wird also stärker nach unten gezogen und zieht daher die Rückenlehnenplatte 70 entlang den Führungsschienen 72 nach unten, obwohl sich diese selber um die Distanz a nach unten bewegen. Damit ist der angestrebte Zweck erreicht. Betrachtet man wieder den Punkt E auf der Rückenlehnenplatte, so wandert dieser im Verlauf der Neigung nach E", also zu dem Punkt, an welchem wie früher erwähnt auch die betreffende Stelle des Rückens des Benützers gelangt ist. Die Relativverschiebung zwischen Lehne und Rücken . fällt damit weg, was sich in einer deutlich spürbaren Komfortverbesserung bemerkbar macht. Das Ausmass dieser Bewegung der Rückenlehnenplatte 70 wird durch die Geometrie des Verstellmechanismus, insbesondere durch diejenige des Übersetzungshebelpaares 13, bestimmt.The rotational movement of the transmission lever 13 now has the consequence, however, that because of the unequal length of the two legs 13a, 13b of each lever, the ends of the legs 1 3b carry out an unevenly larger, ie translated movement. The articulation point 16 thus executes a circular movement around the articulation point 15 as the center point and thereby travels a distance which is denoted by b in FIG. 3. It can immediately be seen that this distance b is considerably greater than the distance a (movement from 6 to 6 ', FIG. 1). The driver bow 14 is thus pulled downward more and therefore pulls the backrest plate 70 down along the guide rails 72, although these themselves move downwards by the distance a. The intended purpose has been achieved. If one looks again at point E on the backrest plate, it moves in the course of the inclination towards E ", ie to the point at which, as mentioned earlier, the relevant point on the back of the user has also reached. The relative displacement between the backrest and back falls the extent of this movement of the backrest plate 70 is determined by the geometry of the adjustment mechanism, in particular by that of the pair of transmission levers 13.

Das hier dargestellte Ausführungsbeispiel zeigt also eine mechanische Verstelleinrichtung. Es versteht sich von selber, dass auch andere Verstelleinrichtungen, z.B. hydraulische oder elektrische, zur Herbeiführung desselben Effektes in Frage kommen könnten. Ebenso ist darauf hinzuweisen, dass vor allem bei Verwendung solcher Verstelleinrichtungen auch eine umgekehrte Relativbewegung zwischen Rückenlehne und Sitz stattfinden kann, indem nämlich der letztere bei der Neigung angehoben wird, während sich die Rückenlehne bzw. die Rückenlehnenplatte lediglich neigt. Durch das Anheben des Sitzes ergibt sich auch in diesem Falle dieselbe Relativverschiebung zwischen Sitz und Rückenlehne wie beim dargestellten Beispiel.The embodiment shown here shows thus a mechanical adjustment device. It goes without saying that other adjustment devices, for example hydraulic or electrical, could also be used to bring about the same effect. It should also be pointed out that, especially when using such adjustment devices, a reverse relative movement between the backrest and the seat can also take place, in that the latter is raised at the inclination while the backrest or the backrest plate merely inclines. By lifting the seat, the same relative displacement between the seat and the backrest results in this case as in the example shown.

Claims (4)

1. Chair with a seat (5), which is pivotable about a fixed, horizontal spindle (4) into a position which slopes off rearwards away from this spindle, and with a back rest (7) fitted to the seat and whose rear edge also moves downwards during sloping and which is simultaneously pivotable about a spindle fitted to the seat, but, due to a sloping mechanism (8, 10) which comes into action, effects a larger pivoting angle (β) than that of the seat, and the back rest (7) has a plate (70) which, by an adjusting device (13, 14) operated by its pivoting movement, is drawn downwards against the seat (5) along a guide (72) during the said movement, characterized in that the adjusting device (13, 14), the back rest plate (70) and the sloping mechanism of back rest (7) together have a common pivot pin (9), which is pivotable about a fixed pin (15), and that the adjusting device has a pair of transmission levers (13), connecting the two latter pins (9,15), which is rotatable aboutthe pin (15) and is extended beyond the same and which, during the movement of the common pivot pin (9), initiates a greater movement of the back rest plate (70) compared therewith.
2. Chair according to Claim 1, characterized in that the pair of transmission levers (13) comprises two substantially L-shaped levers with legs of unequal length and a member (14) which, at its one end, is articulated by means of a pivot pin (16) to the pair of transmission levers, and to whose other end the back rest plate (70) is connected in hinged manner by means of a further pivot pin (17).
3. Chair according to Claims 1 and 2, characterized in that the pivot pin (9) common to the sloping mechanism and the adjusting device is located on the shorter leg (13a) of each transmission lever (13), and that the pair of transmission levers is pivotable about the fixed pin (15), which is essentially passed through the connection point of the two legs (13a, 13b) and is fitted to a support (2) which holds the seat (5).
4. Chair according to Claim 1, the guide for the back rest plate (70) comprising two rails (72), characterized in that each of these two rails is connected at one end in rigid manner to a support of a guide part (8) belonging to the sloping mechanism of back rest (7).
EP81902299A 1981-08-19 1981-08-19 Chair Expired EP0085670B1 (en)

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AT81902299T ATE12168T1 (en) 1981-08-19 1981-08-19 CHAIR.

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PCT/CH1981/000094 WO1983000610A1 (en) 1981-08-19 1981-08-19 Chair

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EP0085670A1 EP0085670A1 (en) 1983-08-17
EP0085670B1 true EP0085670B1 (en) 1985-03-20

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EP (1) EP0085670B1 (en)
JP (1) JPS5841511A (en)
AT (1) ATE12168T1 (en)
AU (1) AU541109B2 (en)
BR (1) BR8109037A (en)
CA (1) CA1183074A (en)
CH (1) CH661647A5 (en)
DE (2) DE3152945D2 (en)
DK (1) DK154921C (en)
FI (1) FI75091C (en)
NO (1) NO160967C (en)
PT (1) PT75330B (en)
WO (1) WO1983000610A1 (en)
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US9004597B2 (en) 2012-09-20 2015-04-14 Steelcase Inc. Chair back mechanism and control assembly
US9010859B2 (en) 2012-09-20 2015-04-21 Steelcase Inc. Chair assembly
US9022476B2 (en) 2012-09-20 2015-05-05 Steelcase Inc. Control assembly for chair
US9027998B2 (en) 2012-09-20 2015-05-12 Steelcase Inc. Chair assembly
US9027997B2 (en) 2012-09-20 2015-05-12 Steelcasel Inc. Chair assembly
US9027999B2 (en) 2012-09-20 2015-05-12 Steelcase Inc. Control assembly for chair
US9049935B2 (en) 2012-09-20 2015-06-09 Steelcase Inc. Control assembly for chair
USD742677S1 (en) 2012-09-20 2015-11-10 Steelcase Inc. Chair
USD742676S1 (en) 2012-09-20 2015-11-10 Steelcase Inc. Chair
US9345328B2 (en) 2012-09-20 2016-05-24 Steelcase Inc. Chair assembly with upholstery covering
US9451826B2 (en) 2012-09-20 2016-09-27 Steelcase Inc. Chair assembly
US9462888B2 (en) 2012-09-20 2016-10-11 Steelcase Inc. Control assembly for chair
US9492013B2 (en) 2012-09-20 2016-11-15 Steelcase Inc. Chair back mechanism and control assembly

Also Published As

Publication number Publication date
US4502729A (en) 1985-03-05
FI75091B (en) 1988-01-29
FI831278A0 (en) 1983-04-15
NO160967C (en) 1989-06-21
DK170083D0 (en) 1983-04-18
EP0085670A1 (en) 1983-08-17
DE3152945C1 (en) 1987-06-19
DE3152945D2 (en) 1983-11-03
FI831278L (en) 1983-04-15
PT75330A (en) 1982-08-01
BR8109037A (en) 1983-09-06
AU541109B2 (en) 1984-12-13
NO160967B (en) 1989-03-13
CH661647A5 (en) 1987-08-14
DK154921C (en) 1989-05-29
DK170083A (en) 1983-04-18
CA1183074A (en) 1985-02-26
DK154921B (en) 1989-01-09
PT75330B (en) 1984-05-21
NO831360L (en) 1983-04-18
JPS5841511A (en) 1983-03-10
WO1983000610A1 (en) 1983-03-03
JPH0230244B2 (en) 1990-07-05
ATE12168T1 (en) 1985-04-15
FI75091C (en) 1988-05-09
AU7450581A (en) 1983-03-08
ZA825764B (en) 1983-06-29

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