EP0900035B1 - Chair with a synchronisation mechanism - Google Patents

Chair with a synchronisation mechanism Download PDF

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Publication number
EP0900035B1
EP0900035B1 EP98903022A EP98903022A EP0900035B1 EP 0900035 B1 EP0900035 B1 EP 0900035B1 EP 98903022 A EP98903022 A EP 98903022A EP 98903022 A EP98903022 A EP 98903022A EP 0900035 B1 EP0900035 B1 EP 0900035B1
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EP
European Patent Office
Prior art keywords
seat
backrest
backrest support
support
chair
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP98903022A
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German (de)
French (fr)
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EP0900035A1 (en
Inventor
Jörg ASSMANN
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Comforto GmbH
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Comforto GmbH
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Publication of EP0900035A1 publication Critical patent/EP0900035A1/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
    • 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
    • A47C1/03294—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest slidingly movable in the base frame, e.g. by rollers

Definitions

  • the invention relates to a chair with synchronous mechanism from the type specified in the preamble of claim 1.
  • synchronous mechanism is an articulated coupling between Seat and backrest such that a change in inclination the backrest automatically with a change in inclination the seat, and vice versa. This improves the seating comfort, because with an upright posture a about horizontal adjustment of the seat and when leaning back Back posture in a sloping position the seat is desired.
  • Chairs with synchronous mechanism are known in numerous versions, for example the publications DE 30 33 953 C2, DE 36 08 718 C3 and DE 38 34 614 A1 can be called.
  • the relationship between the coupled inclination changes of the seat and the backrest i.e. the so-called synchronous course the mutual distances between the pivot axes and articulation points certainly.
  • a chair with synchronous mechanism is known from US-A-5423594, where by changing the length of the backrest support with the base connecting the chair the synchronous ratio can be changed. By changing the length the handlebar also changes the angle between the backrest and seat in the normal position of the See.
  • US-A-5560682 discloses a chair with synchronous mechanism, in which also changes the synchronous process can that the geometry of the backrest support and the Basic structure of the handlebar connection connecting the chair is changed, but only by changing elements the handlebar connection is possible.
  • a chair is known, optionally with or can be executed without synchronous mechanics depending on whether there is a connecting link between the seat and backrest support or between the seat and the base structure of the Chair is arranged.
  • the choice between these two positions the handlebar must be made by the manufacturer, a Adjustment by the user is not provided.
  • the invention has for its object a chair mentioned type so that the synchronous course, i.e. the relationship between the coupled slope changes of the seat and backrest by the user in a simple manner can be changed.
  • the basic idea of the invention is to determine the relationship between the coupled changes in inclination of the seat and backrest not by changing the effective length of one that couples them Handlebar change, but by moving the Handlebar relative to the seat and backrest pivot axis. Because the joints of the handlebar in the slots of the seat and the backrest support are slidably guided and these slots in the normal position of the chair is approximately horizontal and thus is also approximately parallel to each other, by Moving the handlebar in the slots does not incline the backrest changes relative to the seat in the normal position, but only the relationship between the changes in inclination of the backrest and seat.
  • a chair column 1 On a chair column 1 is rotatable in a conventional manner and a seat support 3 adjustable in height.
  • the area of the seat support 3 is about a horizontal axis 5 the seat 7 rotatably mounted.
  • This seat pivot axis 5 is located preferably below the front part of the seat 7.
  • a second horizontal axis of rotation on the seat support 3 9 formed around which a backrest support 11 rotatably mounted is who carries a backrest 13.
  • the backrest support 11 is with the seat 7 by a coupling link 15 articulated coupled.
  • the coupling link 15 an upper journal 15a, which is in an approximately horizontal Slot 17 of the seat 7 engages, and a lower Bearing pin 15b, which is in an approximately horizontal Slot 19 of the backrest support 11 engages.
  • the bearing journals 15a, 15b can be moved in the slots 17, 19, and the position of the coupling link 15 in the longitudinal direction the slots 17, 19 can by means of a screw spindle 21 are adjusted and fixed, which are mounted on the seat support 7 and is rotated by the user with a handwheel 23 can.
  • the coupling link 15 with its journals 15a and 15b and the slots 17, 19 in pairs on both sides of the vertical central plane the seat can be provided. Alternatively, they can also simply provided in the middle plane of the chair his.
  • the coupling link 15 moved in the longitudinal direction of the slots 17, 19 and thereby the distance between those formed by the journals 15a, 15b Hinge points from the seat and backrest pivot axis 5 and 9 can be changed.
  • the coupling link 15 shown in its left or front end position in which the pivot pin 15a of the pivot axis 5 of the seat 7 has the smallest possible distance A. If in this position the coupling arm 15 of the backrest support 11 with the backrest 13 by the angle ⁇ backwards into the dashed position 11 ', 13' shown is pivoted, the seat 7, since he with the backrest support 11 through the coupling link 15 is coupled by the angle ⁇ after pivoted below.
  • the ratio between the angles ⁇ and ⁇ depends on the distance of the coupling link 15 from the Swivel axes 5 and 9. In the shown left end position the coupling link 15 results in the smallest Seat recline angle ⁇ at a given recline angle ⁇ , i.e. the ratio of the seat angle ⁇ Backrest inclination angle ⁇ , the so-called synchronous ratio, has the smallest possible value. It is in the illustrated Example approx. 0.4: 1.
  • the coupling link 15 by means of the spindle 21 after shifted to the right until the bearing pin 15a the right or has reached the rear end of the slot 17 and from the Pivot axis 5 of the seat 7 the greatest possible distance B then the backrest support is inclined backwards 11 by the same angle ⁇ of the seat 7 through the Coupling link 15 by an angular amount ⁇ '(not shown) pulled down, which is significantly larger than the drawn angle ⁇ .
  • ⁇ ' the ratio of the angle ⁇ 'to the angle ⁇ has a larger value.
  • the synchronous ratio in the right end position of the coupling link 15 approx. 0.7: 1.
  • the device for moving the articulated connection can also be used between seat 7 and backrest support 11 relative to whose pivot axes 5 and 9 mechanically in a different way than using guide slots and screw spindles his.
  • the mechanical adjustment shown adjustment by means of an electric motor can also be considered to be pulled.
  • a stepless adjustment a setting in a number of predetermined steps be provided.
  • the change in the synchronous ratio also by moving the seat and / or backrest swivel axis 5, 9 can be brought about relative to the articulated coupling 15.

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

Description

Die Erfindung betrifft einen Stuhl mit Synchronmechanik von der im Oberbegriff des Anspruchs 1 angegebenen Art. Mit Synchronmechariik bezeichnet man eine gelenkige Kopplung zwischen Sitz und Rückenlehne derart, daß eine Neigungsveränderung der Rückenlehne automatisch mit einer Neigungsveränderung des Sitzes, und umgekehrt, verbunden ist. Dies verbessert den Sitzkomfort, da bei aufrechter Rückenhaltung eine etwa horizontale Einstellung des Sitzes und bei zurückgelehnter Rückenhaltung eine nach hinten abfallende Position des Sitzes erwünscht ist. Stühle mit Synchronmechanik sind in zahlreichen Ausführungen bekannt, beispielsweise können die Druckschriften DE 30 33 953 C2, DE 36 08 718 C3 und DE 38 34 614 A1 genannt werden. Das Verhältnis zwischen den miteinander gekoppelten Neigungsänderungen des Sitzes und der Rückenlehne, d.h. der sogenannte Synchronverlauf, wird von den gegenseitigen Abständen der Schwenkachsen und Gelenkverbindungspunkte bestimmt.The invention relates to a chair with synchronous mechanism from the type specified in the preamble of claim 1. With synchronous mechanism is an articulated coupling between Seat and backrest such that a change in inclination the backrest automatically with a change in inclination the seat, and vice versa. This improves the seating comfort, because with an upright posture a about horizontal adjustment of the seat and when leaning back Back posture in a sloping position the seat is desired. Chairs with synchronous mechanism are known in numerous versions, for example the publications DE 30 33 953 C2, DE 36 08 718 C3 and DE 38 34 614 A1 can be called. The relationship between the coupled inclination changes of the seat and the backrest, i.e. the so-called synchronous course the mutual distances between the pivot axes and articulation points certainly.

Dieses Verhältnis bzw. dieser Synchronverlauf liegt bei diesen vorbekannten Stühlen mit Synchronmechanik konstruktionsbedingt unveränderlich fest. Anpassungen an die körperlichen Gegebenheiten der sitzenden Personen, z.B. an das Körpergewicht, sind allenfalls durch Einstellung einer der Neigungsänderung entgegenwirkenden Federkraft (vgl. DE 3608718 C2 oder DE 3700447 A1) oder durch Änderung der Sitzneigung in der Normalstellung (vgl. DE 4324545 A1) möglich. This ratio or this synchronous course lies with them previously known chairs with synchronous mechanism due to the design invariably firm. Adjustments to the physical Conditions of the seated person, e.g. body weight, are at most by setting one of the inclination change counteracting spring force (cf. DE 3608718 C2 or DE 3700447 A1) or by changing the seat angle to the normal position (see. DE 4324545 A1) possible.

Aus US-A-5423594 ist ein Stuhl mit Synchronmechanik bekannt, bei dem durch Ändern der Länge eines den Rückenlehnenträger mit der Basis des Stuhls verbindenden Lenkers das Synchronverhältnis geändert werden kann. Durch eine Längenänderung des Lenkers ändert sich auch der Winkel zwischen Rückenlehne und Sitz in der Normalstellung des Stuhles.A chair with synchronous mechanism is known from US-A-5423594, where by changing the length of the backrest support with the base connecting the chair the synchronous ratio can be changed. By changing the length the handlebar also changes the angle between the backrest and seat in the normal position of the See.

US-A-5560682 offenbart einen Stuhl mit Synchronmechanik, bei dem ebenfalls der Synchronverlauf dadurch geändert werden kann, daß die Geometrie einer den Rückenlehnenträger und der Basis-struktur des Stuhles verbindenden Lenkerverbindung verändert wird, was jedoch nur durch Auswechseln von Elementen der Lenkerverbindung möglich ist.US-A-5560682 discloses a chair with synchronous mechanism, in which also changes the synchronous process can that the geometry of the backrest support and the Basic structure of the handlebar connection connecting the chair is changed, but only by changing elements the handlebar connection is possible.

Aus DE-A-37 00 447 ist ein Stuhl bekannt, der wahlweise mit oder ohne Synchronmechanik ausgeführt werden kann je nach dem, ob ein Verbindungslenker zwischen Sitz- und Rückenlehnenträger oder zwischen Sitz und der Basisstruktur des Stuhles angeordnet wird. Die Wahl zwischen diesen beiden Positionen des Lenkers muß herstellerseitig erfolgen, eine Verstellmöglichkeit durch den Benutzer ist nicht vorgesehen.From DE-A-37 00 447 a chair is known, optionally with or can be executed without synchronous mechanics depending on whether there is a connecting link between the seat and backrest support or between the seat and the base structure of the Chair is arranged. The choice between these two positions the handlebar must be made by the manufacturer, a Adjustment by the user is not provided.

Der Erfindung liegt die Aufgabe zugrunde, einen Stuhl der genannten Art so auszubilden, daß der Synchronverlauf, d.h. das Verhältnis zwischen den gekoppelten Neigungsänderungen von Sitz und Lehne durch den Benutzer in einfacher Weise verändert werden kann.The invention has for its object a chair mentioned type so that the synchronous course, i.e. the relationship between the coupled slope changes of the seat and backrest by the user in a simple manner can be changed.

Die erfindungsgemäße Lösung der Aufgabe ist in Anspruch 1 angegeben. Die Unteransprüche beziehen sich auf vorteilhafte weitere Ausgestaltungen der Erfindung.The achievement of the object is in claim 1 specified. The sub-claims relate to advantageous further refinements of the invention.

Grundgedanke der Erfindung ist es, das Verhältnis zwischen den gekoppelten Neigungsänderungen von Sitz und Rückenlehne nicht durch Verändern der effektiven Länge eines sie koppelnden Lenkers zu verändern, sondern durch Verschieben des Lenkers relativ zur Sitz- und Lehnenschwenkachse. Da die Gelenke des Lenkers in Schlitzen des Sitzes und des Rückenlehnenträgers verschiebbar geführt sind und diese Schlitze in der Normalstellung des Stuhles annähernd horizontal und damit auch annähernd parallel zueinander verlaufen, wird durch Verschieben des Lenkers in den Schlitzen nicht die Neigung der Rückenlehne relativ zum Sitz in der Normalstellung verändert, sondern nur das Verhältnis zwischen den Neigungsänderungen von Rückenlehne und Sitz.The basic idea of the invention is to determine the relationship between the coupled changes in inclination of the seat and backrest not by changing the effective length of one that couples them Handlebar change, but by moving the Handlebar relative to the seat and backrest pivot axis. Because the joints of the handlebar in the slots of the seat and the backrest support are slidably guided and these slots in the normal position of the chair is approximately horizontal and thus is also approximately parallel to each other, by Moving the handlebar in the slots does not incline the backrest changes relative to the seat in the normal position, but only the relationship between the changes in inclination of the backrest and seat.

Eine Ausführungsform der Erfindung wird anhand der Zeichnung näher erläutert. Diese zeigt in schematischer Seitenansicht einen Bürostuhl mit einer einstellbaren Synchronmechanik gemäß einem Ausführungsbeispiel der Erfindung.An embodiment of the invention is based on the drawing explained in more detail. This shows a schematic side view an office chair with an adjustable synchronous mechanism according to an embodiment of the invention.

An einer Stuhlsäule 1 ist in an sich bekannter Weise drehbar und höhenverstellbar ein Sitzträger 3 gelagert. Im vorderen Bereich des Sitzträgers 3 ist um eine horizontale Achse 5 drehbar der Sitz 7 gelagert. Diese Sitzschwenkachse 5 befindet sich vorzugsweise unterhalb des vorderen Teils des Sitzes 7. In einem Abstand von der Drehachse 5 nach hinten versetzt ist am Sitzträger 3 eine zweite horizontale Drehachse 9 ausgebildet, um die ein Rückenlehnenträger 11 drehbar gelagert ist, der eine Rückenlehne 13 trägt. Der Rückenlehnenträger 11 ist mit dem Sitz 7 durch einen Kopplungslenker 15 gelenkig gekoppelt. Zu diesem Zweck hat der Kopplungslenker 15 einen oberen Lagerzapfen 15a, der in einen annähernd horizontalen Schlitz 17 des Sitzes 7 eingreift, und einen unteren Lagerzapfen 15b, der in einen annähernd horizontalen Schlitz 19 des Rückenlehnenträgers 11 eingreift. Die Lagerzapfen 15a, 15b sind in den Schlitzen 17, 19 verschiebbar, und die Position des Kopplungslenkers 15 in Längsrichtung der Schlitze 17, 19 kann mittels einer Schraubspindel 21 verstellt und festgelegt werden, die am Sitzträger 7 gelagert ist und mit einem Handrad 23 vom Benutzer gedreht werden kann.On a chair column 1 is rotatable in a conventional manner and a seat support 3 adjustable in height. In the front The area of the seat support 3 is about a horizontal axis 5 the seat 7 rotatably mounted. This seat pivot axis 5 is located preferably below the front part of the seat 7. At a distance from the axis of rotation 5 to the rear is a second horizontal axis of rotation on the seat support 3 9 formed around which a backrest support 11 rotatably mounted is who carries a backrest 13. The backrest support 11 is with the seat 7 by a coupling link 15 articulated coupled. For this purpose, the coupling link 15 an upper journal 15a, which is in an approximately horizontal Slot 17 of the seat 7 engages, and a lower Bearing pin 15b, which is in an approximately horizontal Slot 19 of the backrest support 11 engages. The bearing journals 15a, 15b can be moved in the slots 17, 19, and the position of the coupling link 15 in the longitudinal direction the slots 17, 19 can by means of a screw spindle 21 are adjusted and fixed, which are mounted on the seat support 7 and is rotated by the user with a handwheel 23 can.

Es versteht sich für den Fachmann, daß der Kopplungslenker 15 mit seinen Lagerzapfen 15a und 15b sowie die Schlitze 17, 19 jeweils paarweise beiderseits der lotrechten Mittelebene des Sitzes vorgesehen sein können. Alternativ können sie auch nur einfach in der Mittelebene des Stuhls vorgesehen sein.It is understood by those skilled in the art that the coupling link 15 with its journals 15a and 15b and the slots 17, 19 in pairs on both sides of the vertical central plane the seat can be provided. Alternatively, they can also simply provided in the middle plane of the chair his.

Durch Drehen der Schraubspindel 21 kann der Kopplungslenker 15 in Längsrichtung der Schlitze 17, 19 verschoben und dadurch der Abstand der von den Lagerzapfen 15a, 15b gebildeten Gelenkpunkte von der Sitz- und Lehnenschwenkachse 5 und 9 verändert werden. In der Zeichnung ist der Kopplungslenker 15 in seiner linken oder vorderen Endposition dargestellt, in der der Gelenkzapfen 15a von der Schwenkachse 5 des Sitzes 7 den kleinstmöglichen Abstand A hat. Wenn in dieser Position des Kopplungslenkers 15 der Rückenlehnenträger 11 mit der Rückenlehne 13 um den Winkel β nach hinten in die gestrichelt dargestellte Position 11', 13' geschwenkt wird, wird der Sitz 7, da er mit dem Rückenlehnenträger 11 durch den Kopplungslenker 15 gekoppelt ist, um den Winkel α nach unten geschwenkt. Das Verhältnis zwischen den Winkeln α und β hängt von dem Abstand des Kopplungslenkers 15 von den Schwenkachsen 5 und 9 ab. In der dargestellten linken Endposition des Kopplungslenkers 15 ergibt sich der kleinste Sitzneigungswinkel α bei einem gegebenen Lehnenneigungswinkel β, d.h. das Verhältnis des Sitzneigungswinkels α zum Lehnenneigungswinkel β, das sogenannte Synchronverhältnis, hat den kleinstmöglichen Wert. Es beträgt bei dem dargestellten Beispiel ca. 0,4 : 1.By turning the screw 21, the coupling link 15 moved in the longitudinal direction of the slots 17, 19 and thereby the distance between those formed by the journals 15a, 15b Hinge points from the seat and backrest pivot axis 5 and 9 can be changed. In the drawing is the coupling link 15 shown in its left or front end position, in which the pivot pin 15a of the pivot axis 5 of the seat 7 has the smallest possible distance A. If in this position the coupling arm 15 of the backrest support 11 with the backrest 13 by the angle β backwards into the dashed position 11 ', 13' shown is pivoted, the seat 7, since he with the backrest support 11 through the coupling link 15 is coupled by the angle α after pivoted below. The ratio between the angles α and β depends on the distance of the coupling link 15 from the Swivel axes 5 and 9. In the shown left end position the coupling link 15 results in the smallest Seat recline angle α at a given recline angle β, i.e. the ratio of the seat angle α Backrest inclination angle β, the so-called synchronous ratio, has the smallest possible value. It is in the illustrated Example approx. 0.4: 1.

Wird der Kopplungslenker 15 mittels der Spindel 21 nach rechts verschoben, bis der Lagerzapfen 15a das rechte oder hintere Ende des Schlitzes 17 erreicht hat und von der Schwenkachse 5 des Sitzes 7 den größtmöglichen Abstand B hat, dann wird bei einer Rückwärtsneigung des Rückenlehnenträgers 11 um den gleichen Winkel β der Sitz 7 durch den Kopplungslenker 15 um einen Winkelbetrag α' (nicht eingezeichnet) nach unten gezogen, der deutlich größer ist als der eingezeichnete Winkel α. Dies bedeutet, daß das Verhältnis des Winkels α' zum Winkel β einen größeren Wert hat. Bei dem dargestellten Ausführungsbeispiel würde das Synchronverhältnis in der rechten Endstellung des Kopplungslenkers 15 ca. 0,7 : 1 betragen.The coupling link 15 by means of the spindle 21 after shifted to the right until the bearing pin 15a the right or has reached the rear end of the slot 17 and from the Pivot axis 5 of the seat 7 the greatest possible distance B then the backrest support is inclined backwards 11 by the same angle β of the seat 7 through the Coupling link 15 by an angular amount α '(not shown) pulled down, which is significantly larger than the drawn angle α. This means that the ratio of the angle α 'to the angle β has a larger value. In the illustrated embodiment, the synchronous ratio in the right end position of the coupling link 15 approx. 0.7: 1.

Es versteht sich, daß die Zeichnung nur ein schematisches Ausführungsbeispiel darstellt. Zahlreiche für die Erfindung unwesentliche Einzelheiten sind weggelassen, wie z.B. etwaige Federn oder dergleichen, die den Schwenkbewegungen des Sitzes 7 und des Rückenlehnenträgers 11 den erforderlichen Widerstand leisten, bzw. die Rückstellkraft erzeugen, die Sitz und Lehne in die Normalstellung zurückführt. It is understood that the drawing is only a schematic Representing embodiment. Numerous for the invention insignificant details are omitted, e.g. any Springs or the like that the pivoting movements of the Seat 7 and the backrest support 11 the required Resist or generate the restoring force that Returns the seat and backrest to the normal position.

Auch kann die Einrichtung zum Verschieben der Gelenkverbindung zwischen Sitz 7 und Rückenlehnenträger 11 relativ zu deren Schwenkachsen 5 und 9 mechanisch in anderer Weise als mittels Führungsschlitzen und Schraubspindeln ausgeführt sein. An Stelle der dargestellten mechanischen Verstellung kann auch eine Verstellung mittels Elektromotor in Betracht gezogen werden. Anstatt einer stufenlosen Verstellung kann eine Einstellung in einer Anzahl von vorgegebenen Schritten vorgesehen sein. Auch kann die Änderung des Synchronverhältnisses auch durch Verlagern der Sitz- und/oder Lehnenschwenkachse 5, 9 relativ zur Gelenkkopplung 15 herbeigeführt werden.The device for moving the articulated connection can also be used between seat 7 and backrest support 11 relative to whose pivot axes 5 and 9 mechanically in a different way than using guide slots and screw spindles his. Instead of the mechanical adjustment shown adjustment by means of an electric motor can also be considered to be pulled. Instead of a stepless adjustment a setting in a number of predetermined steps be provided. Also, the change in the synchronous ratio also by moving the seat and / or backrest swivel axis 5, 9 can be brought about relative to the articulated coupling 15.

Claims (3)

  1. A chair, with a synchronising mechanism, having
       a frame (3),
       a seat (7) which is pivotably mounted on the frame (3) about a real or imaginary horizontal seat pivot axis (5) and which can pivot downwards from its normal position,
       a backrest support (11) carrying a backrest (13), which support is pivotably mounted on the frame (3) about a real or imaginary horizontal backrest pivot axis (9) and can pivot rearwards from its normal position,
       and a link (15) which at both ends is connected by means of articulations (15a,15b) to the seat (7) and to the backrest support (11) respectively and couples their pivoting movements with one another,
       wherein the ratio between the alterations in the pivot angles (α, β) of the seat (7) and the backrest support (11), i.e. the synchronising curve, is determined by the distances of the articulations (15a,15b) from the seat pivot axis (5) and the backrest pivot axis (9),
    characterised in that the articulations (15a,15b) of the link (15) are guided displaceably in slots (17,19) of the seat (7) and of the backrest support (11), and in that the slots (17,19) extend substantially horizontally in the normal position of the seat (7) and the backrest support (11), and in that the link (15) can be adjusted and located stepwise or continuously along the slots (17,19) by an adjusting mechanism (21).
  2. A chair according to Claim 1, characterised in that the adjusting mechanism hasp a screw spindle (21).
  3. A chair according to Claim 1 or 2, characterised in that the adjustment extent of the link (15) relative to the seat (7) and to the backrest support (11) is chosen so that the synchronising ratio, i.e. the ratio of an alteration in inclination of the seat (7) relative to the alteration in inclination of the backrest support (11) coupled therewith at the end of the adjustment range is lower than 0.5 to 1, in particular about 0.4:1 or lower, and at the other end of the adjustment range is more than 0.5:1, in particular about 0.7:1 or more.
EP98903022A 1997-01-23 1998-01-22 Chair with a synchronisation mechanism Expired - Lifetime EP0900035B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19702328A DE19702328A1 (en) 1997-01-23 1997-01-23 Chair with synchronous mechanism
DE19702328 1997-01-23
PCT/EP1998/000342 WO1998032353A1 (en) 1997-01-23 1998-01-22 Chair with a synchronisation mechanism

Publications (2)

Publication Number Publication Date
EP0900035A1 EP0900035A1 (en) 1999-03-10
EP0900035B1 true EP0900035B1 (en) 2002-11-06

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EP98903022A Expired - Lifetime EP0900035B1 (en) 1997-01-23 1998-01-22 Chair with a synchronisation mechanism

Country Status (4)

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US (1) US5931531A (en)
EP (1) EP0900035B1 (en)
DE (2) DE19702328A1 (en)
WO (1) WO1998032353A1 (en)

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DE59806164D1 (en) 2002-12-12
WO1998032353A1 (en) 1998-07-30
EP0900035A1 (en) 1999-03-10
US5931531A (en) 1999-08-03
DE19702328A1 (en) 1998-07-30

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