EP1989961A1 - Synchronisation mechanism for office chairs - Google Patents

Synchronisation mechanism for office chairs Download PDF

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Publication number
EP1989961A1
EP1989961A1 EP08007665A EP08007665A EP1989961A1 EP 1989961 A1 EP1989961 A1 EP 1989961A1 EP 08007665 A EP08007665 A EP 08007665A EP 08007665 A EP08007665 A EP 08007665A EP 1989961 A1 EP1989961 A1 EP 1989961A1
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EP
European Patent Office
Prior art keywords
support
seat
coupling element
synchronous mechanism
lever
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Granted
Application number
EP08007665A
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German (de)
French (fr)
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EP1989961B1 (en
Inventor
Hermann Bock
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Bock 1 GmbH and Co KG
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Bock 1 GmbH and Co KG
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Publication of EP1989961A1 publication Critical patent/EP1989961A1/en
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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
    • A47C1/03261—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means
    • A47C1/03266—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with adjustable elasticity
    • 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
    • A47C1/03272—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with coil springs

Definitions

  • the invention relates to a synchronous mechanism for office chairs with the features specified in the preamble of claim 1, as is known from a variety of documents, such as DE 103 57 165 A1 or DE 36 35 044 A1 in its basic structure is known.
  • synchronous mechanism assemblies are understood in the seat base of an office chair, which provide for a coupled, a certain relative movement of the seat and backrest with each other bringing kinematics.
  • a base support is placed on a chair column, to which on the one hand a pivotable about a transverse axis, hingedly connected to the base support seat support and on the other hand also pivotable about a transverse axis, hingedly connected to the base support backrest support are mounted.
  • On the seat support of the usually provided with a padded seat seat of the office chair is mounted.
  • the backrest support which extends in a conventional manner from the actual synchronizing mechanism to the rear, carries on an upwardly extending arm, the backrest of the office chair.
  • Seat support and backrest support are coupled so articulated that a pivoting movement of the backrest to the rear - as can be caused for example by leaning of the chair user to the backrest - induces a lowering movement of the rear edge of the seat down.
  • This correlated seat-back movement provides a significant comfort advantage and is desirable for orthopedic reasons.
  • a fundamental issue with synchronous mechanisms is their spring action against the pivoting backwards.
  • a variety of spring designs is known from the prior art.
  • the construction according to DE 10 25 994 A1 provided spring assembly is based on two torsion springs, which are housed in the base support.
  • the one leg of the spring is housed in an adjustment in the base support, whereas the second leg projects upwards in the direction of seat support, which is supported via a corresponding abutment on this leg and thus acted against its rearward pivoting direction.
  • the invention is based on the object to provide a synchronous mechanism for office chairs with an improved adjustment, due to which the adjustment of the counter-spring force can be done with high ease of use, especially low effort and travel.
  • a coupling element arranged between the seat support and the support lever is provided for transmitting the pivoting movement of the seat support to the support lever.
  • the distance of the coupling element to the axes of rotation of seat support and support lever is now adjustable so that at a given pivot angle of the seat support results in a distance-dependent pivot angle of the support lever.
  • the compression of the compression spring is dependent on the distance of the coupling element to the axes of rotation of seat support and support lever.
  • the displaceable coupling element thus adds to a certain extent a displaceable transmission gear between seat support and compression spring, which is independent of the reaction force of the compression spring adjustable.
  • the adjusting mechanism does not have to work against the spring force, as is the case, for example, with a counterforce adjustment by a change in the bias of the spring.
  • the synchronous mechanism 1 as a supporting element on a base support 2, which in the region of its rear end with a cone seat 3 (see Fig. 6 ) is provided for attaching the synchronizing mechanism 1 to the upper end of a chair column 4 indicated by dashed lines.
  • Further basic components of the synchronizing mechanism 1 are the backrest support 5 and the seat support 6.
  • the backrest support 5 is mounted in front of the cone receptacle 3 approximately centrally in the base support 2 so as to be pivotable on the base support 2 via a transverse axis 7. He has two rearwardly extending side struts 8, 9, which include between them a receiving plate 10 for mounting the backrest, not shown.
  • the base support 2 extends from the cone seat 3 in an arc forward above (see Fig. 2 and 3 ), where formed in its front end portion of the substantially inverted, in plan view approximately rectangular pan seat support 6 with its front end portion via a hinge 11 (see Fig. 6 ) is attached.
  • the seat support 6 In its rear end region of the seat support 6 is also coupled to the backrest support 5 articulated.
  • the backrest support 5 In its rear end region of the seat support 6 is also coupled to the backrest support 5 articulated.
  • the backrest support 5 In its rear end region of the seat support 6 upwardly projecting bearing cheeks 12, 13 are formed, the outwardly projecting axle stub 14, 15 carry.
  • the backrest support 5 engages in corresponding receptacles in the seat support 6 and thus forms the in Fig. 4 and 5 indicated, transverse pivot axis 16 between the backrest 5 and seat support. 6
  • Fig. 2 shows the synchronous mechanism 1 in its normal position in which the seat support and thus the seat cushion unit (not shown) substantially horizontal and the backrest support 5 are arranged so that the backrest, also not shown, attached to the backrest support 2 is substantially upright.
  • the backrest support 5 is moved backwards downwards (in the clockwise direction according to FIG Fig. 2 and 3 ) is pivoted about the transverse axis 7.
  • the seat support 6 is pivoted in the pivoting direction S about the hinge 11 down.
  • the three components base support 2, backrest support 5 and seat support 6 then take the in Fig. 3 shown position with reclined seat cushion unit and swung backwards backrest a.
  • the synchronous mechanism 1 is subjected to a force by means of a designated as a whole by 17 spring arrangement against the synchronizing adjustment movement explained above.
  • the heart of this spring arrangement 17 is a central in the base support 2 in the vertical direction, open-wound helical compression spring 18, which is supported with its lower end to an abutment 19 in the base support 2 in front of the cone seat 3. With its upper end, the compression spring 18 is supported on the top wall 21 of the seat support 6 via a support lever 20 which will be explained in more detail below.
  • the seat support 6 pivots downward, whereby the helical compression spring 18 is compressed and generates a corresponding counterforce against the synchronizing movement.
  • each of a coupling element 24 supporting the adjusting slide 23 of the adjustment are mounted on a designated as a whole with 30 rack drive in the seat longitudinal direction L adjustable.
  • the downwardly facing edge of the lock slider 23 on a rack 31 which meshes with small diameter gears 32 in each case.
  • the latter are rotatably mounted on the axis 29, on the same centric a larger diameter gear 33 rotatably seated.
  • the latter is driven by a driven gear 34 on a transversely extending, arranged in the base support 2 adjusting shaft 35, at the free end of a hand wheel 36 for manual actuation of the adjustment assembly 22 is seated.
  • the support cheeks 27 are provided on their coupling element 24 facing upper side with a low-friction coating 37, for example made of PTFE, so that the trained in cross-section as a spherically shaped head coupling element 24 can slide particularly smoothly along the support cheeks 27.
  • a low-friction coating 37 for example made of PTFE
  • the lock slider 23 it is further provided that in the in Fig. 7 . 9 and 13 illustrated starting position of the clearance gap 38 between the top of the support cheeks 27 including covering 37 to the bottom 39 of the top wall 21 of the seat support 6 is slightly larger than the vertical extent d of the designed as a crowned coupling element 24.
  • the support lever 20 beats with the top of its support plate 25th on the underside 39 of the top wall 21 of the seat support 6, as shown in black contour in Fig. 13 becomes clear.
  • the counter-spring force F of the helical compression spring 18 is removed on the seat support 6 and the coupling element 24 can under play in this basic position according to the Fig. 7 . 9 and 13 unaffected by the spring force in the seat longitudinal direction L can be adjusted.
  • This is done by turning accomplished on the hand wheel 36.
  • the rotational movement is transmitted via the adjusting shaft 35, the driven gear 34, the central gear 33 and the two smaller gears 32 on the two adjusting slide 23 of the adjustment 22, so that the coupling elements 24 of the lock slider 23 between the in Fig. 7 and 9 shown extreme positions with maximum or minimum distance A S , A A of the axes of rotation (hinge 11 and axis 29 of seat support 6 and support lever 20) is displaceable.
  • Fig. 7 illustrated basic position of the synchronous mechanism 1, in which the coupling elements 24 are arranged on the adjusting slides 23 of the adjustment assembly 22 with a maximum distance a S , A A from the axes of rotation 11, 29 from the seat support 6 and support lever 20.
  • the synchronous mechanism 1 is activated by pivoting the backrest, the seat support 6 is pivoted about the axis of rotation (hinge 11). Due to the different axis of rotation of the support lever 20, the pivotal movement of the seat support 6 is transmitted via the coupling elements 24 on the support lever 20.
  • S S of the seat support 6 results in a maximum pivot angle S A ( Fig.
  • the adjusting arrangement 22 is actuated by means of the hand wheel 36 and the coupling elements 24 are moved from the in Fig. 7 shown starting position in the in Fig. 9 shown end position (distances a S 'and a A ' in Fig. 11 ).
  • the support lever 20 is more deflected due to the closer to its axis of rotation towards the coupling elements 24, as in Fig. 11 indicated by dashed lines.
  • the helical compression spring 18 is compressed at a constant swivel angle S S of the seat support 6 and the counter generated by it in the synchronous mechanism 1 -Feather force larger.

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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)

Abstract

The mechanics has a spring arrangement for pressurizing the mechanics against synchronous adjustment movement of a seat support (6) and a backrest carrier (5). An adjustment arrangement exhibits a coupling element (24) for transmission of the rotation movement of the support on a supporting lever (20). The distance of the element to a rotation axis (11) from the support and the lever is adjustable in such a manner that a distance-dependant rotation angle of the lever results with given rotation angle of the support and obtains a distance-dependent compression measure of a compression spring.

Description

Die Erfindung betrifft eine Synchronmechanik für Bürostühle mit den im Oberbegriff des Anspruchs 1 angegebenen Merkmalen, wie sie aus einer Vielzahl von Druckschriften, beispielsweise der DE 103 57 165 A1 oder DE 36 35 044 A1 in ihrem grundsätzlichen Aufbau bekannt ist.The invention relates to a synchronous mechanism for office chairs with the features specified in the preamble of claim 1, as is known from a variety of documents, such as DE 103 57 165 A1 or DE 36 35 044 A1 in its basic structure is known.

Unter der Bezeichnung "Synchronmechanik" werden Baugruppen im Sitzunterbau eines Bürostuhles verstanden, die für eine miteinander gekoppelte, eine bestimmte Relativbewegung von Sitz- und Rückenlehne zueinander mit sich bringende Kinematik sorgen. Dazu ist auf einer Stuhlsäule ein Basisträger platziert, an dem zum einen ein um eine Querachse schwenkbarer, gelenkig mit dem Basisträger verbundener Sitzträger und zum anderen ein ebenfalls um eine Querachse schwenkbarer, gelenkig mit dem Basisträger verbundener Rückenlehnenträger gelagert sind. Auf dem Sitzträger ist der in aller Regel mit einer gepolsterten Sitzfläche versehene Sitz des Bürostuhls montiert. Der Rückenlehnenträger, der sich gängiger Weise von der eigentlichen Synchronmechanik nach hinten erstreckt, trägt an einem nach oben verlaufenden Ausleger die Rückenlehne des Bürostuhles.The term "synchronous mechanism" assemblies are understood in the seat base of an office chair, which provide for a coupled, a certain relative movement of the seat and backrest with each other bringing kinematics. For this purpose, a base support is placed on a chair column, to which on the one hand a pivotable about a transverse axis, hingedly connected to the base support seat support and on the other hand also pivotable about a transverse axis, hingedly connected to the base support backrest support are mounted. On the seat support of the usually provided with a padded seat seat of the office chair is mounted. The backrest support, which extends in a conventional manner from the actual synchronizing mechanism to the rear, carries on an upwardly extending arm, the backrest of the office chair.

Sitzträger und Rückenlehnenträger sind derart gelenkig gekoppelt, dass eine Schwenkbewegung der Rückenlehne nach hinten - wie sie beispielsweise durch ein Anlehnen des Stuhlbenutzers an die Rückenlehne hervorgerufen werden kann - eine Absenkbewegung der Hinterkante des Sitzes nach unten induziert. Diese korrelierte Sitz-Rückenlehnen-Bewegung bringt einen erheblichen Komfortvorteil mit sich und ist aus orthopädischen Gründen erwünscht.Seat support and backrest support are coupled so articulated that a pivoting movement of the backrest to the rear - as can be caused for example by leaning of the chair user to the backrest - induces a lowering movement of the rear edge of the seat down. This correlated seat-back movement provides a significant comfort advantage and is desirable for orthopedic reasons.

Ein grundsätzlicher Sachverhalt bei Synchronmechaniken liegt in ihrer Federbeaufschlagung gegen die Verschwenkung nach hinten. Hierzu ist aus dem Stand der Technik eine Vielzahl von Federkonstruktionen bekannt. Die bei der Konstruktion gemäß DE 10 25 994 A1 vorgesehene Federanordnung basiert auf zwei Schenkelfedern, die im Basisträger untergebracht sind. Der eine Schenkel der Feder ist in einer Verstellanordnung im Basisträger untergebracht, wogegen der zweite Schenkel nach oben in Richtung Sitzträger ragt, der sich über ein entsprechendes Widerlager an diesem Schenkel abstützt und damit entgegen seiner nach hinten gerichteten Schwenkrichtung beaufschlagt wird.A fundamental issue with synchronous mechanisms is their spring action against the pivoting backwards. For this purpose, a variety of spring designs is known from the prior art. The construction according to DE 10 25 994 A1 provided spring assembly is based on two torsion springs, which are housed in the base support. The one leg of the spring is housed in an adjustment in the base support, whereas the second leg projects upwards in the direction of seat support, which is supported via a corresponding abutment on this leg and thus acted against its rearward pivoting direction.

Bei dieser Verstellanordnung wird der sich darin abstützende Schenkel der Schenkelfeder zur Änderung deren Vorspannung in seiner Position verstellt, wobei direkt gegen die Kraft der Schenkelfeder gearbeitet werden muss. Dies bedingt einen relativ hohen Kraftaufwand bei der Verstellung.In this adjustment arrangement, the legs of the leg spring which are supported therein are adjusted in their position to change their pretension, wherein it is necessary to work directly against the force of the leg spring. This requires a relatively high force during adjustment.

Bei der Synchronmechanik gemäß DE 103 57 165 A1 sind als Federanordnung Schraubenzugfedern vorgesehen, deren eine Aufhängungspunkt über eine Verstellmechanik in Feder-Längsrichtung verstellbar ist. Dadurch wird die Vorspannung der Federanordnung und damit die Gegen-Federkraft verstellt. Konkret sind schwenkbar gelagerte Aufhängungshaken für die Enden der Federn in der Federanordnung vorgesehen. Durch ein relativ komplexes Getriebe wird die Drehbewegung einer Betätigungswelle in eine Schwenkbewegung der Aufnahmehaken umgesetzt, die so eine Verlagerung des Aufhängepunktes der Federn und eine Variierung der Federvorspannung erzeugen.In the synchronous mechanism according to DE 103 57 165 A1 are provided as a spring assembly Schraubenzugfedern whose suspension point is adjustable via an adjustment in spring-length direction. As a result, the bias of the spring assembly and thus the counter-spring force is adjusted. Specifically, pivotally mounted suspension hooks are provided for the ends of the springs in the spring assembly. By a relatively complex gear, the rotational movement of an actuating shaft is converted into a pivotal movement of the receiving hooks, which thus produce a displacement of the suspension point of the springs and a variation of the spring preload.

Auch bei dieser Verstelleinrichtung für die Federvorspannung wird gegen die Kraft der Feder gearbeitet, sodass entweder hohe Betätigungskräfte herrschen oder eine solche Getriebeübersetzung innerhalb des Betätigungsmechanismus vorgesehen werden, dass für die Verstellung über einen bestimmten Bereich eine hohe Anzahl von Umdrehungen der Betätigungswelle notwendig sind. Beides bringt Einbußen beim Bedienungskomfort der Federkraft-Verstellung mit sich.Also in this adjustment for the spring preload is worked against the force of the spring, so either high actuation forces prevail or such a gear ratio are provided within the actuating mechanism that a large number of revolutions of the actuating shaft are necessary for the adjustment over a certain range. Both bring with it losses in the ease of use of the spring force adjustment with it.

Bei der DE 36 35 044 A1 ist als Federanordnung eine Druckfeder vorgesehen, die zur Beaufschlagung des Sitzträgers entgegen seiner Schwenkrichtung zwischen dem Basisträger und einem mit dem Sitzträger schwenkbaren Abstützhebel eingespannt ist.In the DE 36 35 044 A1 is provided as a spring arrangement, a compression spring which is clamped for urging the seat support against its pivoting direction between the base support and a pivotable with the seat support support lever.

Der Erfindung liegt nun die Aufgabe zugrunde, eine Synchronmechanik für Bürostühle mit einer verbesserten Verstellanordnung anzugeben, aufgrund derer die Verstellung der Gegen-Federkraft mit hohem Bedienungskomfort, insbesondere geringem Kraftaufwand und Stellweg erfolgen kann.The invention is based on the object to provide a synchronous mechanism for office chairs with an improved adjustment, due to which the adjustment of the counter-spring force can be done with high ease of use, especially low effort and travel.

Diese Aufgabe wird durch die im Kennzeichnungsteil des Anspruches 1 angegebenen Merkmale gelöst. Demnach ist als Verstellanordnung für die Gegen-Federkraft der Druckfeder ist ein zwischen Sitzträger und Abstützhebel angeordnetes Koppelelement zur Übertragung der Schwenkbewegung des Sitzträgers auf den Abstützhebel vorgesehen. Der Abstand des Koppelelements zu den Drehachsen von Sitzträger und Abstützhebel ist nun derart verstellbar, dass sich bei gegebenem Schwenkwinkel des Sitzträgers ein abstandsabhängiger Schwenkwinkel des Abstützhebels ergibt. Damit wird auch das Kompressionsmaß der Druckfeder abhängig vom Abstand des Koppelelements zu den Drehachsen von Sitzträger und Abstützhebel.This object is achieved by the features stated in the characterizing part of claim 1. Accordingly, as an adjusting arrangement for the counter-spring force of the compression spring, a coupling element arranged between the seat support and the support lever is provided for transmitting the pivoting movement of the seat support to the support lever. The distance of the coupling element to the axes of rotation of seat support and support lever is now adjustable so that at a given pivot angle of the seat support results in a distance-dependent pivot angle of the support lever. Thus, the compression of the compression spring is dependent on the distance of the coupling element to the axes of rotation of seat support and support lever.

Das verschiebbare Koppelelement fügt also gewissermaßen ein verschiebbares Übersetzungsgetriebe zwischen Sitzträger und Druckfeder ein, das unabhängig von der Gegenkraft der Druckfeder verstellbar ist. Insbesondere muss der Verstellmechanismus nicht gegen die Federkraft arbeiten, wie dies beispielsweise bei einer Gegenkraft-Einstellung durch eine Änderung der Vorspannung der Feder der Fall ist.The displaceable coupling element thus adds to a certain extent a displaceable transmission gear between seat support and compression spring, which is independent of the reaction force of the compression spring adjustable. In particular, the adjusting mechanism does not have to work against the spring force, as is the case, for example, with a counterforce adjustment by a change in the bias of the spring.

Bevorzugte Weiterbildungen des Erfindungsgegenstandes sind in den abhängigen Ansprüchen angegeben, deren Merkmale, Einzelheiten und Vorteile der nachfolgenden Beschreibung eines Ausführungsbeispiels anhand der beigefügten Zeichnungen entnehmbar sind. Es zeigen:

Fig. 1
eine perspektivische Ansicht einer Synchronmechanik schräg von hinten,
Fig. 2 und 3
Seitenansichten der Synchronmechanik in der horizontalen Grund- und nach hinten abgesenkten Auslenkstellung,
Fig. 4 und 5
perspektivische Ansichten der Synchronmechanik von schräg vorne und hinten bei abgenommenem Sitzträger,
Fig. 6
einen Vertikalschnitt der Synchronmechanik in der Längsmittelebene,
Fig. 7 bis 10
Vertikalschnitte entlang der Schnittlinie W-W gemäß Fig. 12 in Grund- und abgesenkter Stellung der Synchronmechanik mit unterschiedlich eingestellter Gegen-Federkraft,
Fig. 11
ein höchst schematisches Schaubild zur Erläuterung der Funktionsweise der Gegenkraft-Verstellung,
Fig. 12
einen vertikalen Querschnitt der Synchronmechanik entlang der Schnittlinie A-A nach Fig. 6, und
Fig. 13
einen in Längsrichtung versetzten Vertikalschnitt der Synchronmechanik entlang der Schnittlinie C-C gemäß Fig. 12.
Preferred embodiments of the subject invention are set forth in the dependent claims, whose features, details and advantages of the following description of an embodiment with reference to the accompanying drawings are removable. Show it:
Fig. 1
a perspective view of a synchronous mechanism obliquely from behind,
FIGS. 2 and 3
Side views of the synchronizing mechanism in the horizontal base and to the rear lowered deflection position,
4 and 5
perspective views of the synchronous mechanism obliquely from the front and rear with the seat support removed,
Fig. 6
a vertical section of the synchronous mechanism in the longitudinal center plane,
Fig. 7 to 10
Vertical sections along the section line WW according to Fig. 12 in the basic and lowered position of the synchronizing mechanism with differently adjusted counter-spring force,
Fig. 11
a highly schematic diagram for explaining the operation of the counterforce adjustment,
Fig. 12
a vertical cross-section of the synchronous mechanism along the section line AA after Fig. 6 , and
Fig. 13
a longitudinally offset vertical section of the synchronous mechanism along the section line CC according to Fig. 12 ,

Wie aus den Fig. 1 bis 3 deutlich wird, weist die Synchronmechanik 1 als tragendes Element einen Basisträger 2 auf, der im Bereich seines hinteren Endes mit einer Konusaufnahme 3 (siehe Fig. 6) zum Aufstecken der Synchronmechanik 1 auf das obere Ende einer gestrichelt angedeuteten Stuhlsäule 4 versehen ist. Weitere Grundbauteile der Synchronmechanik 1 sind der Rückenlehnenträger 5 und der Sitzträger 6. Der Rückenlehnenträger 5 ist vor der Konusaufnahme 3 etwa mittig im Basisträger 2 über eine Querachse 7 schwenkbar am Basisträger 2 gelagert. Er weist dabei zwei nach hinten verlaufende Seitenstreben 8, 9 auf, die zwischen sich eine Aufnahmeplatte 10 zur Montage der nicht näher dargestellten Rückenlehne einschließen.Like from the Fig. 1 to 3 becomes clear, has the synchronous mechanism 1 as a supporting element on a base support 2, which in the region of its rear end with a cone seat 3 (see Fig. 6 ) is provided for attaching the synchronizing mechanism 1 to the upper end of a chair column 4 indicated by dashed lines. Further basic components of the synchronizing mechanism 1 are the backrest support 5 and the seat support 6. The backrest support 5 is mounted in front of the cone receptacle 3 approximately centrally in the base support 2 so as to be pivotable on the base support 2 via a transverse axis 7. He has two rearwardly extending side struts 8, 9, which include between them a receiving plate 10 for mounting the backrest, not shown.

Der Basisträger 2 erstreckt sich von der Konusaufnahme 3 aus in einem Bogen nach vorne oben (siehe Fig. 2 und 3), wo in seinem vorderen Endbereich der im Wesentlichen als umgekehrte, in Draufsicht etwa rechteckige Wanne ausgebildete Sitzträger 6 mit seinem vorderen Endbereich über ein Gelenk 11 (siehe Fig. 6) angebunden ist.The base support 2 extends from the cone seat 3 in an arc forward above (see Fig. 2 and 3 ), where formed in its front end portion of the substantially inverted, in plan view approximately rectangular pan seat support 6 with its front end portion via a hinge 11 (see Fig. 6 ) is attached.

In seinem rückwärtigen Endbereich ist der Sitzträger 6 mit dem Rückenlehnenträger 5 ebenfalls gelenkig gekoppelt. Dazu sind im Bereich der Seitenstreben 8, 9 des Rückenlehnenträgers 5 nach oben abstehende Lagerwangen 12, 13 angeformt, die nach außen abstehende Achsstummel 14, 15 tragen. Damit greift der Rückenlehnenträger 5 in entsprechende Aufnahmen im Sitzträger 6 ein und bildet somit die in Fig. 4 und 5 angedeutete, in Querrichtung verlaufende Schwenkachse 16 zwischen Rückenlehnen 5 und Sitzträger 6.In its rear end region of the seat support 6 is also coupled to the backrest support 5 articulated. For this purpose, in the region of the side struts 8, 9 of the backrest support 5 upwardly projecting bearing cheeks 12, 13 are formed, the outwardly projecting axle stub 14, 15 carry. Thus, the backrest support 5 engages in corresponding receptacles in the seat support 6 and thus forms the in Fig. 4 and 5 indicated, transverse pivot axis 16 between the backrest 5 and seat support. 6

Aufgrund der gelenkigen Verbindung zwischen Basisträger 2, Sitzträger 6 und Rückenlehnenträger 5 kann eine typische Verstellbewegung der Synchronmechanik 1 erzielt werden, wie es sich aus einem Vergleich der Fig. 2 und 3 ergibt. Fig. 2 zeigt die Synchronmechanik 1 in ihrer Grundstellung, in der der Sitzträger und damit die darauf befindliche (nicht dargestellte) Sitzpolstereinheit im Wesentlichen horizontal und der Rückenlehnenträger 5 so angeordnet sind, dass die ebenfalls nicht dargestellte, am Rückenlehnenträger 2 befestigte Rückenlehne im Wesentlichen aufrecht gestellt ist.Due to the articulated connection between base support 2, seat support 6 and backrest support 5, a typical adjustment movement of the synchronous mechanism 1 can be achieved, as can be seen from a comparison of Fig. 2 and 3 results. Fig. 2 shows the synchronous mechanism 1 in its normal position in which the seat support and thus the seat cushion unit (not shown) substantially horizontal and the backrest support 5 are arranged so that the backrest, also not shown, attached to the backrest support 2 is substantially upright.

Lehnt sich der Stuhlbenutzer gegen diese Rückenlehne an, so wird der Rückenlehnenträger 5 nach hinten unten (im Uhrzeigersinn gemäß Fig. 2 und 3) um die Querachse 7 verschwenkt. Dabei wird der Sitzträger 6 in Schwenkrichtung S um das Gelenk 11 nach unten verschwenkt. Die drei Bauteile Basisträger 2, Rückenlehnenträger 5 und Sitzträger 6 nehmen dann die in Fig. 3 gezeigte Stellung mit nach hinten geneigter Sitzpolstereinheit und nach hinten weggeschwenkter Rückenlehne ein.If the chair user leans against this backrest, the backrest support 5 is moved backwards downwards (in the clockwise direction according to FIG Fig. 2 and 3 ) is pivoted about the transverse axis 7. In this case, the seat support 6 is pivoted in the pivoting direction S about the hinge 11 down. The three components base support 2, backrest support 5 and seat support 6 then take the in Fig. 3 shown position with reclined seat cushion unit and swung backwards backrest a.

Die Synchronmechanik 1 ist mit Hilfe einer als Ganzes mit 17 bezeichneten Federanordnung entgegen der oben erläuterten Synchronverstellbewegung kraftbeaufschlagt. Herzstück dieser Federanordnung 17 ist eine zentral im Basisträger 2 in vertikaler Richtung angeordnete, offen gewickelte Schraubendruckfeder 18, die sich mit ihrem unteren Ende an einem Gegenlager 19 im Basisträger 2 vor der Konusaufnahme 3 abstützt. Mit ihrem oberen Ende stützt sich die Druckfeder 18 über einen noch näher zu erläuternden Abstützhebel 20 an der Deckwand 21 des Sitzträgers 6 ab. Bei der oben erwähnten Verschwenkung der Synchronmechanik 1 in Schwenkrichtung S schwenkt der Sitzträger 6 nach unten, wodurch die Schraubendruckfeder 18 komprimiert wird und eine entsprechende Gegenkraft gegen die Synchronverstellbewegung erzeugt.The synchronous mechanism 1 is subjected to a force by means of a designated as a whole by 17 spring arrangement against the synchronizing adjustment movement explained above. The heart of this spring arrangement 17 is a central in the base support 2 in the vertical direction, open-wound helical compression spring 18, which is supported with its lower end to an abutment 19 in the base support 2 in front of the cone seat 3. With its upper end, the compression spring 18 is supported on the top wall 21 of the seat support 6 via a support lever 20 which will be explained in more detail below. In the above-mentioned pivoting of the synchronizing mechanism 1 in the pivoting direction S, the seat support 6 pivots downward, whereby the helical compression spring 18 is compressed and generates a corresponding counterforce against the synchronizing movement.

Zur Einstellung dieser Gegenkraft ist eine als Ganzes mit 22 bezeichnete Verstellanordnung vorgesehen, deren Herzstücke die beiden Stellschieber 23 mit den daran angeformten Koppelelementen 24 sind. Diese Verstellanordnung 22 wird im Folgenden noch ausführlich erörtert.To adjust this reaction force is designated as a whole with 22 adjustment arrangement, the heart of which are the two adjusting slide 23 with the coupling elements 24 formed thereon. This adjustment arrangement 22 will be discussed in more detail below.

Wie aus den Fig. 4 bis 6 deutlich wird, ist der Abstützhebel 20 als einarmiger Hebel ausgebildet, dessen flächiger Hebelarm an seinem freien Ende eine Abstützplatte 25 für das obere Ende der Schraubendruckfeder 18 ausbildet. Diese ist dort mit Hilfe eines angeformten Gegenlagers 26 gehalten. Symmetrisch zur Mittellängsebene (= Zeichnungsebene in Fig. 6) sind beiderseits der Abstützplatte 25 zwei horizontal und in Sitzlängsrichtung L verlaufende Stützwangen 27 am Abstützhebel 20 vorgesehen, die mit dem oben erwähnten, noch näher zu erörternden Koppelelement 24 des Stellschiebers 23 kooperieren. Der Abstützhebel 20 ist schließlich über zwei in Querrichtung fluchtende, seitliche Lagerwangen 28 (siehe Fig. 4, 12 und 13) auf einer in Querrichtung verlaufenden Achse 29 der Verstellanordnung 22 zusammen mit dem Sitzträger 6 verschwenkbar.Like from the 4 to 6 becomes clear, the support lever 20 is formed as a one-armed lever whose flat lever arm at its free end forms a support plate 25 for the upper end of the helical compression spring 18. This is held there by means of a molded abutment 26. Symmetrical to the central longitudinal plane (= drawing plane in Fig. 6 ) are on both sides of the support plate 25 two horizontally and in the seat longitudinal direction L extending support cheeks 27 provided on the support lever 20, which cooperate with the above-mentioned, yet to be discussed coupling element 24 of the lock slider 23. The support lever 20 is finally over two transversely aligned, lateral bearing cheeks 28 (see Fig. 4 . 12 and 13 ) on a transverse axis 29 of the adjustment assembly 22 together with the seat support 6 pivotally.

Wie ferner aus den Fig. 4, 5 und 7 deutlich wird, sind die jeweils ein Koppelelement 24 tragenden Stellschieber 23 der Verstellanordnung über einen als Ganzes mit 30 bezeichneten Zahnstangenantrieb in Sitzlängsrichtung L verstellbar gelagert. Dazu weist der nach unten weisende Rand der Stellschieber 23 eine Zahnstange 31 auf, die jeweils mit im Durchmesser kleinen Zahnrädern 32 kämmt. Letztere sind auf der Achse 29 drehfest gelagert, auf der gleichzeitig zentrisch ein im Durchmesser größeres Zahnrad 33 drehfest sitzt. Letzteres wird durch ein Abtriebszahnrad 34 auf einer in Querrichtung verlaufenden, im Basisträger 2 angeordneten Verstellwelle 35 angetrieben, an deren freien Ende ein Handrad 36 zur manuellen Betätigung der Verstellanordnung 22 sitzt.As further from the Fig. 4 . 5 and 7 it becomes clear that each of a coupling element 24 supporting the adjusting slide 23 of the adjustment are mounted on a designated as a whole with 30 rack drive in the seat longitudinal direction L adjustable. For this purpose, the downwardly facing edge of the lock slider 23 on a rack 31 which meshes with small diameter gears 32 in each case. The latter are rotatably mounted on the axis 29, on the same centric a larger diameter gear 33 rotatably seated. The latter is driven by a driven gear 34 on a transversely extending, arranged in the base support 2 adjusting shaft 35, at the free end of a hand wheel 36 for manual actuation of the adjustment assembly 22 is seated.

Wie insbesondere aus Fig. 7 und 13 deutlich wird, sind die Stützwangen 27 auf ihrer dem Koppelelement 24 zugewandten Oberseite mit einem reibungsarmen Belag 37, beispielsweise aus PTFE, versehen, so dass das im Querschnitt als ballig geformter Kopf ausgebildete Koppelelement 24 besonders leichtgängig entlang der Stützwangen 27 gleiten kann. Für eine leichtgängige Verstellung der Stellschieber 23 ist es ferner vorgesehen, dass in der in Fig. 7, 9 und 13 dargestellten Ausgangsposition der Abstandsspalt 38 zwischen der Oberseite der Stützwangen 27 einschließlich Belag 37 zur Unterseite 39 der Deckwand 21 des Sitzträgers 6 etwas größer ist als die vertikale Ausdehnung d des als balliger Kopf ausgestalteten Koppelelementes 24. Dazu schlägt der Abstützhebel 20 mit der Oberseite seiner Abstützplatte 25 an der Unterseite 39 der Deckwand 21 des Sitzträgers 6 an, wie aus der schwarz hervorgehobenen Kontur in Fig. 13 deutlich wird. Dadurch ist die Gegen-Federkraft F der Schraubendruckfeder 18 auf den Sitzträger 6 abgetragen und das Koppelelement 24 kann unter Spiel in dieser Grundstellung gemäß den Fig. 7, 9 und 13 unbeeinflusst von der Federkraft in Sitzlängsrichtung L verstellt werden. Dies wird durch ein Drehen am Handrad 36 bewerkstelligt. Die Drehbewegung wird über die Verstellwelle 35, das Abtriebszahnrad 34, das zentrale Zahnrad 33 und die beiden kleineren Zahnräder 32 auf die beiden Stellschieber 23 der Verstellanordnung 22 übertragen, so dass die Koppelelemente 24 der Stellschieber 23 zwischen den in Fig. 7 und 9 dargestellten Extrempositionen mit maximalem bzw. minimalem Abstand aS, aA von den Drehachsen (Gelenk 11 bzw. Achse 29 von Sitzträger 6 bzw. Abstützhebel 20) verschiebbar ist.As in particular from Fig. 7 and 13 becomes clear, the support cheeks 27 are provided on their coupling element 24 facing upper side with a low-friction coating 37, for example made of PTFE, so that the trained in cross-section as a spherically shaped head coupling element 24 can slide particularly smoothly along the support cheeks 27. For a smooth adjustment of the lock slider 23, it is further provided that in the in Fig. 7 . 9 and 13 illustrated starting position of the clearance gap 38 between the top of the support cheeks 27 including covering 37 to the bottom 39 of the top wall 21 of the seat support 6 is slightly larger than the vertical extent d of the designed as a crowned coupling element 24. For this purpose, the support lever 20 beats with the top of its support plate 25th on the underside 39 of the top wall 21 of the seat support 6, as shown in black contour in Fig. 13 becomes clear. As a result, the counter-spring force F of the helical compression spring 18 is removed on the seat support 6 and the coupling element 24 can under play in this basic position according to the Fig. 7 . 9 and 13 unaffected by the spring force in the seat longitudinal direction L can be adjusted. This is done by turning accomplished on the hand wheel 36. The rotational movement is transmitted via the adjusting shaft 35, the driven gear 34, the central gear 33 and the two smaller gears 32 on the two adjusting slide 23 of the adjustment 22, so that the coupling elements 24 of the lock slider 23 between the in Fig. 7 and 9 shown extreme positions with maximum or minimum distance A S , A A of the axes of rotation (hinge 11 and axis 29 of seat support 6 and support lever 20) is displaceable.

Die in Fig. 7 bis 10 dargestellten Zustände der Synchronmechanik 1 finden sich in der Schemadarstellung gemäß Fig. 11 wieder, anhand derer die Gegenkraftverstellung mit Hilfe der Verstellanordnung 22 wie folgt zu erläutern ist (der Übersichtlichkeit halber ist in den Fig. 7 bis 10 die Schraubendruckfeder 28 weggelassen):In the Fig. 7 to 10 shown states of the synchronous mechanism 1 can be found in the schematic representation according to Fig. 11 again, on the basis of which the counterforce adjustment with the aid of the adjusting arrangement 22 is to be explained as follows (for the sake of clarity is in the Fig. 7 to 10 the helical compression spring 28 omitted):

Ausgegangen wird von der in Fig. 7 dargestellten Grundstellung der Synchronmechanik 1, in der die Koppelelemente 24 an den Stellschiebern 23 der Verstellanordnung 22 mit maximalem Abstand aS, aA von den Drehachsen 11, 29 vom Sitzträger 6 und Abstützhebel 20 angeordnet sind. Wird nun die Synchronmechanik 1 durch ein Verschwenken der Rückenlehne aktiviert, wird der Sitzträger 6 um die Drehachse (Gelenk 11) verschwenkt. Aufgrund der abweichenden Drehachse des Abstützhebels 20 wird die Schwenkbewegung des Sitzträgers 6 über die Koppelelemente 24 auf den Abstützhebel 20 übertragen. Bei einem maximalen Schwenkwinkel SS des Sitzträgers 6 ergibt sich ein maximaler Schwenkwinkel SA (Fig. 11) des Abstützhebels 20, der für eine bestimmte Komprimierung der Schraubendruckfeder 18 und damit eine Gegen-Kraft F gegen die Verstellbewegung der Synchronmechanik 1 sorgt. Diese Gegenkraft F ist bei der Stellung der Koppelelemente 24 und in Fig. 7 und 8 minimal.It starts from the in Fig. 7 illustrated basic position of the synchronous mechanism 1, in which the coupling elements 24 are arranged on the adjusting slides 23 of the adjustment assembly 22 with a maximum distance a S , A A from the axes of rotation 11, 29 from the seat support 6 and support lever 20. Now, if the synchronous mechanism 1 is activated by pivoting the backrest, the seat support 6 is pivoted about the axis of rotation (hinge 11). Due to the different axis of rotation of the support lever 20, the pivotal movement of the seat support 6 is transmitted via the coupling elements 24 on the support lever 20. At a maximum pivot angle S S of the seat support 6 results in a maximum pivot angle S A ( Fig. 11 ) of the support lever 20, which provides for a certain compression of the helical compression spring 18 and thus a counter-force F against the adjustment of the synchronous mechanism 1. This counterforce F is at the position of the coupling elements 24 and in Fig. 7 and 8th minimal.

Zur Erhöhung der Gegenkraft F wird mit Hilfe des Handrades 36 die Verstellanordnung 22 betätigt und die Koppelelemente 24 werden von der in Fig. 7 gezeigten Ausgangsstellung in die in Fig. 9 gezeigte Endstellung verfahren (Abstände aS' und aA' in Fig. 11). Wird nun die Synchronmechanik verschwenkt, so ist der Abstützhebel 20 aufgrund der näher zu dessen Drehachse hin gewanderten Koppelelemente 24 stärker ausgelenkt, wie dies in Fig. 11 gestrichelt eingezeichnet ist. Bei ein- und demselben maximalen Schwenkwinkel SS des Sitzträgers 6 ergibt sich ein größerer Schwenkwinkel SA' des Abstützhebels 20. Damit wird die Schraubendruckfeder 18 bei gleich bleibendem Schwenkwinkel SS des Sitzträgers 6 stärker komprimiert und die von ihr in der Synchronmechanik 1 erzeugte Gegen-Federkraft größer.To increase the counterforce F, the adjusting arrangement 22 is actuated by means of the hand wheel 36 and the coupling elements 24 are moved from the in Fig. 7 shown starting position in the in Fig. 9 shown end position (distances a S 'and a A ' in Fig. 11 ). Now, if the synchronous mechanism is pivoted, the support lever 20 is more deflected due to the closer to its axis of rotation towards the coupling elements 24, as in Fig. 11 indicated by dashed lines. At the same maximum swivel angle S S of the seat support 6 results in a larger swivel angle S A 'of the support lever 20. Thus, the helical compression spring 18 is compressed at a constant swivel angle S S of the seat support 6 and the counter generated by it in the synchronous mechanism 1 -Feather force larger.

Claims (10)

Synchronmechanik für Bürostühle umfassend - einen auf einer Stuhlsäule (4) platzierbaren Basisträger (2), - einen um eine Querachse (7) schwenkbar am Basisträger (2) angelenkten Rückenlehnenträger (5), - einen Sitzträger (6), der im Bereich seines vorderen Endes über ein Gelenk (11) um eine Querachse schwenkbar mit dem Basisträger (2) und im Bereich seines rückwärtigen Endes um eine Querachse (16) schwenkbar mit dem Rückenlehnenträger (5) gekoppelt ist, - eine Federanordnung (17) zur Beaufschlagung der Synchronmechanik entgegen deren Synchron-Verstellbewegung von Sitz- (6) und Rückenlehnenträger (5), wobei die Federanordnung (17) eine Druckfeder (18) aufweist, die zur Beaufschlagung des Sitzträgers (6) entgegen seiner Schwenkrichtung (S) zwischen Basisträger (2) und einem mit dem Sitzträger (6) schwenkbaren Abstützhebel (20) eingespannt ist, sowie - eine Verstellanordnung (22) für die Gegen-Federkraft der Federanordnung (17), dadurch gekennzeichnet, dass - die Verstellanordnung (22) ein zwischen Sitzträger (6) und Abstützhebel (20) angeordnetes Koppelelement (24) zur Übertragung der Schwenkbewegung des Sitzträgers (6) auf den Abstützhebel (20) aufweist, wobei der Abstand (aS, aA) des Koppelelementes (24) zu den Drehachsen (11, 29) von Sitzträger (6) und Abstützhebel (20) derart verstellbar ist, dass sich bei gegebenem Schwenkwinkel (SS) des Sitzträgers (6) ein abstandsabhängiger Schwenkwinkel (SA) des Abstützhebels (20) und damit ein abstandsabhängiges Kompressionsmaß der Druckfeder (18) ergibt. Comprising synchronous mechanism for office chairs a base support (2) which can be placed on a chair column (4), a backrest support (5) pivotable about a transverse axis (7), pivotable on the base support (2), - A seat support (6) in the region of its front end via a hinge (11) about a transverse axis pivotally coupled to the base support (2) and in the region of its rear end about a transverse axis (16) pivotally connected to the backrest support (5) . - A spring assembly (17) for acting on the synchronous mechanism against the synchronous adjustment of the seat (6) and backrest support (5), wherein the spring assembly (17) has a compression spring (18) for applying the seat support (6) against its Swinging direction (S) between the base support (2) and one with the seat support (6) pivotable support lever (20) is clamped, and an adjusting arrangement (22) for the counter-spring force of the spring arrangement (17), characterized in that - The adjusting arrangement (22) between a seat support (6) and support lever (20) arranged coupling element (24) for transmitting the pivotal movement of the seat support (6) on the support lever (20), wherein the distance (a S , a A ) of the Coupling element (24) to the axes of rotation (11, 29) of the seat support (6) and support lever (20) is adjustable such that at a given pivot angle (S S ) of the seat support (6) a distance-dependent pivot angle (S A ) of the support lever ( 20) and thus a distance-dependent compression measure the compression spring (18) results. Synchronmechanik nach Anspruch 1, dadurch gekennzeichnet, dass der Abstützhebel (20) eine sein freies Ende bildende Abstützplatte (25) für die Druckfeder (18) aufweist.Synchronous mechanism according to claim 1, characterized in that the support lever (20) has a free end forming support plate (25) for the compression spring (18). Synchronmechanik nach Anspruch 2, dadurch gekennzeichnet, dass die Abstützplatte (25) von mindestens einer Stützwange (27), vorzugsweise beiderseits von jeweils einer Stützwange (27), zur Abstützung an dem mindestens einen Koppelelement (24) flankiert ist.Synchronous mechanism according to claim 2, characterized in that the support plate (25) of at least one support cheek (27), preferably on both sides of each support cheek (27), is flanked for support on the at least one coupling element (24). Synchronmechanik nach einem der vorgenannten Ansprüche, dadurch gekennzeichnet, dass das Koppelelement (24) an einem Stellschieber (23) angeordnet ist, der mittels eines manuell betätigbaren Antriebes (35, 36) zur Verstellung des Abstandes des Koppelelementes (24) von den Drehachsen (11, 29) von Sitzträger (6) und Abstützhebel (20) verschiebbar ist.Synchronous mechanism according to one of the preceding claims, characterized in that the coupling element (24) is arranged on a control slide (23) by means of a manually operable drive (35, 36) for adjusting the distance of the coupling element (24) from the axes of rotation (11 , 29) of the seat support (6) and support lever (20) is displaceable. Synchronmechanik nach Anspruch 4, dadurch gekennzeichnet, dass der Stellschieber (23) mittels eines Zahnstangenantriebes (31, 32, 33) verschiebbar ist.Synchronous mechanism according to claim 4, characterized in that the adjusting slide (23) by means of a rack and pinion drive (31, 32, 33) is displaceable. Synchronmechanik nach einem der vorgenannten Ansprüche, dadurch gekennzeichnet, dass der Zahnstangenantrieb (31, 32, 33) von einer manuell betätigbaren Verstellwelle (35) über ein Zahnradgetriebe (34, 33) antreibbar ist.Synchronous mechanism according to one of the preceding claims, characterized in that the rack drive (31, 32, 33) of a manually operable adjusting shaft (35) via a gear transmission (34, 33) is drivable. Synchronmechanik mindestens nach Anspruch 3, dadurch gekennzeichnet, dass die mindestens eine Stützwange (27) auf ihrer dem Koppelelement (24) zugewandten Stützbahn mit einem reibungsarmen Belag (37) versehen ist.Synchronous mechanism at least according to claim 3, characterized in that the at least one support cheek (27) on its the coupling element (24) facing support track with a low-friction coating (37) is provided. Synchronmechanik nach Anspruch 3 oder 8, dadurch gekennzeichnet, dass das in der nicht ausgelenkten Ausgangsstellung der Synchronmechanik (1) der Abstandsspalt (38) zwischen der mindestens einen Stützwange (27) des Abstützhebel (20) und dem Sitzträger (6) so bemessen ist, dass er größer als die Dicke (d) des Koppelelementes (24) ist, wodurch sich der Abstützhebel (20) direkt am Sitzträger (6) abstützt und das Koppelelement (24) zur Verstellung der Gegen-Federkraft (F) in dieser Stellung von der Beaufschlagung durch die Druckfeder (18) entkoppelt verschiebbar ist.Synchronous mechanism according to claim 3 or 8, characterized in that in the non-deflected starting position of the synchronizing mechanism (1) the distance gap (38) between the at least one support cheek (27) of the support lever (20) and the seat support (6) is so dimensioned that it is greater than the thickness (d) of the coupling element (24), whereby the support lever (20) directly on the seat support (6) is supported and the coupling element (24) for adjusting the counter-spring force (F) in this position of the Actuation by the compression spring (18) decoupled is displaced. Synchronmechanik mindestens nach Anspruch 4, dadurch gekennzeichnet, dass der Stellschieber (23) und der Abstützhebel (20) um eine gemeinsame Achse (29) schwenkbar gelagert sind.Synchronous mechanism at least according to claim 4, characterized in that the lock slider (23) and the support lever (20) about a common axis (29) are pivotally mounted. Synchronmechanik nach einem der vorgenannten Ansprüche, dadurch gekennzeichnet, dass das Koppelelement (24) als ballig geformter Kopf am Stellschieber (23) ausgebildet ist.Synchronous mechanism according to one of the preceding claims, characterized in that the coupling element (24) is designed as a spherically shaped head on the adjusting slide (23).
EP08007665A 2007-05-07 2008-04-19 Synchronisation mechanism for office chairs Not-in-force EP1989961B1 (en)

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DE102009010234A1 (en) 2009-02-24 2010-09-02 Klöber GmbH Synchronization mechanism for office chair, has spring lever with rotation point that is arranged in lower region of plate, where front pivotable part of spring lever is directly pressed on pressure spring
US8857909B2 (en) 2011-08-04 2014-10-14 Bock 1 Gmbh & Co. Kg Chair with a rocking mechanism
EP3741256A1 (en) * 2019-05-21 2020-11-25 BOCK 1 GmbH & Co. KG Synchronisation mechanism

Also Published As

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EP1989961B1 (en) 2012-08-22
DE102007021782B3 (en) 2008-09-18

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