EP1258210A2 - Synchronised mechanism for a coupled seat- and backrest-movement in an office chair - Google Patents

Synchronised mechanism for a coupled seat- and backrest-movement in an office chair Download PDF

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Publication number
EP1258210A2
EP1258210A2 EP02009186A EP02009186A EP1258210A2 EP 1258210 A2 EP1258210 A2 EP 1258210A2 EP 02009186 A EP02009186 A EP 02009186A EP 02009186 A EP02009186 A EP 02009186A EP 1258210 A2 EP1258210 A2 EP 1258210A2
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EP
European Patent Office
Prior art keywords
support
backrest
seat
movement
seat support
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Granted
Application number
EP02009186A
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German (de)
French (fr)
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EP1258210B1 (en
EP1258210A3 (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 EP1258210A2 publication Critical patent/EP1258210A2/en
Publication of EP1258210A3 publication Critical patent/EP1258210A3/en
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Publication of EP1258210B1 publication Critical patent/EP1258210B1/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
    • A47C1/03205—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest having adjustable and lockable inclination
    • 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
    • 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
    • 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
    • A47C1/03274—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 of torsion type

Definitions

  • the invention relates to a synchronous mechanism for a correlated seat-backrest movement an office chair with the in the preamble of Features specified claim 1, as they from DE 199 21 153 A1 are known.
  • Assemblies in the seat substructure are called "synchronous mechanics" of an office chair understood for a coupled, a certain relative movement of the seat and backrest to each other associated kinematics.
  • On the seat support is the usually office chair with a padded seat assembled.
  • the backrest support which differs commonly from the the actual synchronous mechanism extends to the rear, carries on to one the arm of the office chair runs at the top.
  • Seat support and backrest support are articulated so that a Swiveling movement of the backrest to the rear - as for example nervous by leaning the chair user against the backrest can be - a lowering movement of the rear edge of the seat down induced.
  • This correlated seat-backrest movement brings you considerable comfort advantage and is for orthopedic reasons he wishes.
  • the above objectives are at the above mentioned Document provided storage of the backrest support via a Handlebar arrangement reached on the base support, which defines a four-link chain.
  • the handlebar arrangement consists of two hinged to the base bracket Handlebars and the backrest support itself as a coupling of the four-link chain.
  • the longitudinal axes of the two handlebars stand up in one acute angle opening towards the seat.
  • the backrest support in the form of a Four-link chain can basically reach a large swivel angle, the backrest support is not only about a fixed pivot axis turns, but performs an additional tilting movement to the rear. This The handlebars open and upwards turn and tilt pronounced possible.
  • the seat support at its front end region is articulated on the base support via another handlebar.
  • this handlebar In your upright position Position of the synchronous mechanism, this handlebar is inclined forward. With its rear end area, the seat support is on the backrest support hinged.
  • the articulated storage of the seat carrier provides a total of three Handlebar pairs on both sides of the seat median longitudinal plane a relatively complex Construction.
  • a synchronous mechanism is known from DE 198 10 768 A1, in which the Backrest support articulated to the base support in a single hinge point is and thus performs a pure swivel movement.
  • the seat support this synchronous mechanism is at the rear end with a hinge point coupled to the backrest support. At the front end it is in one oblong control curve rising diagonally from the bottom to the top guided.
  • this backrest-seat support linkage Although structurally simpler, it also has one opposite Kinematics less well adapted to practical requirements on.
  • the rising elongated control curve for mounting the The front end of the seat carrier leads to the one already associated with the Construction according to DE 199 21 153 A1 discussed lifting movement of the front edge of the seat.
  • the invention has for its object a synchronous mechanism of the generic type Art to improve so that under constructive simplification the initial lifting movement of the seat carrier is avoided.
  • This task is according to the characterizing part of claim 1 by Formation of the joint between the base support and seat support at the front end solved as a rotary slide joint, which is designed so that the Lowering movement of the seat support after a horizontal sliding movement is superimposed on the back.
  • the rotary-slide joint is preferably by a horizontal, slot-like, running in the longitudinal direction of the seat Backdrop formed in the seat support, in which a bearing journal of the seat support is guided is.
  • the arrangement and dimensioning the joints and handlebars between the base support and backrest support or seat carrier provided four-link chain serve to achieve a particularly compact structure in a comparative enlarged to the prior art according to DE 199 21 153 A1 Ratio of the swivel angle of the backrest to the swivel angle of the seat holder.
  • the base support can be attached on the outside Handlebar and the backrest support part also particularly compact and serve as the central "backbone" of the synchronous mechanism. This is done by the preferred design of the handlebars as a widened sheet on the one hand created an additional design element, on the other hand under Occupational safety aspects pinching the fingers in the synchronous mechanism reliably prevented.
  • the basic structure of the synchronous mechanism designated as a whole by 1 is to be explained with reference to FIGS. 1 and 3. Accordingly, it shows one Base carrier 2, which by means of a cone holder 3 on the upper End of a chair column 4 is set. Outside and above the side, Cheeks 5 running parallel to the longitudinal direction L of the chair Various construction parts of the synchronous mechanism 1. Core pieces of it are a substantially frame-shaped seat support 6 and a fork-shaped backrest support in plan view 7. On the seat support 6 is the padded seat (not shown) assembled. The backrest support 7 holds via an angled cross member 18 a backrest, also not shown, in modern office chairs is adjustable in height.
  • the backrest support 7 is thus articulated with a handlebar arrangement connected to the base support 2.
  • This handlebar arrangement has a first Link 8, which is approximately in the middle of a pivot bearing 9 on the base support 2 is articulated.
  • a second link 10 is between the front link 8 and Cone seat 3 mounted on a pivot bearing 11 on the base support 2.
  • the free ends of the two links 8, 10 are connected via joints 12, 13 coupled to the backrest support 7.
  • the two pivot bearings 9, 11 and the joints 12, 13 define a four-link chain in which the backrest manager 7 itself with its respective fork leg 14 forms.
  • the front link 8 is approximately vertically upwards, while the rear one Handlebar 10 is inclined to the rear.
  • the two through the hinge points extending longitudinal axes 15, 16 of the links 8, 10 form one opening upwards towards the seat support 6, acute angle W (FIG. 1) of just over 30 °.
  • the aspect ratio between the front and rear Handlebars 8, 10 is about 2.5: 3. Because of the above interpretation and arrangement of the four-link chain is carried out by the backrest support 7 the indicated in Fig. 1 by the arrow 17 superimposed rotary and Swiveling movement backwards and downwards.
  • the seat support 6 is in front of its rear End 19 with the backrest support 7 via a bearing eye 20 to the front joint 12 forming axis coupled and so with its rear Articulated end area.
  • the joint between seat support 6 and backrest support 7 is thus in the front joint 12 between the handlebar 8 and backrest support 7 integrated.
  • At its front end region 21 - that is 1 in the left is the seat support 6 with the base support 2 over one as a whole connected with 22 designated rotary-slide joint.
  • the latter is on a bearing extension 27 of the base support 2 is formed and is perpendicular to the central longitudinal plane M from this outwards and into the scenery 25.
  • the synchronous mechanism 1 is countered by a spring arrangement F.
  • Arrow direction 17 - that is, pretensioned to the basic position of the synchronous mechanism 1.
  • This spring arrangement F is in the form of two in the transverse direction mutually aligned leg springs 28 (Fig. 3) given around the the pivot bearing 9 of the front link 8 forming axis positioned are.
  • the upward-pointing leg 29 is supported on a projection 30 on the seat support 6, while the second, forward leg 31 is supported in an adjustment mechanism 32 in the base support 2.
  • the Leg springs 28 exert a spring force against that directed towards the rear Swivel movement of the backrest made by the adjustment mechanism 32 can be varied by actuation by a rotary lever 33.
  • the backrest support leads 7 when the backrest is loaded to the rear the swivel-rotary movement indicated by arrow 17 to the rear below, with the rear link 10 of the four-bar chain continuing to the rear and the front handlebar 8 also fold backwards.
  • the Angle W between the longitudinal axes 15, 16 of the two links 8, 10 approximately 20 ° (Fig. 2).
  • the four-link chain folds, so to speak the further spread starting position according to FIG. 1 together, so that this already compact arrangement is further reduced becomes.
  • the compact arrangement also contributes to the fact that the distance a between the two Joints 12, 13 between the backrest support 7 and the handlebars 8 or 10 sit, approximately equal to the length L10 of the rear link 10 and in the ratio already given is greater than the length L8 of the front Handlebar 8 is.
  • the seat support 6 Due to the mentioned pivoting movement of the four-link chain with the backrest support 7, the seat support 6 is both down towards the rear pivoted as well as horizontally in the region of the rotary sliding joint 22 moved backwards. This means that there is no relevant stroke movement of the front end 21 of the seat, causing any constrictions or avoid pressure on the underside of the thighs become.
  • the synchronous mechanism 1 is otherwise designed so that in Fig. 2nd shown swung back end position of the backrest support 7 a Swivel angle W7 of approx. 26 ° passes during the swivel angle W6 of the seat support 6 is approximately 15 °. It is remarkable that the ratio of the swivel angle of the backrest and seat support during the pivoting movement changes. So the relationship is initially a value of approximately 3.5: 1, is reduced approximately in the middle of the Swivel range to values around 2: 1, finally at the end, i.e. at maximum swivel to achieve a ratio W7: W6 of about 1.8: 1.
  • the synchronizing mechanism 1 is in different Positions between the basic position (Fig. 1) and the maximum position pivoted to the rear (FIG. 2).
  • the corresponding Locking device is not shown explicitly in the figures and is required it belongs to the state of the art - no detailed discussion. It it is only pointed out that the determination with the further Operating lever 35 on the side of the rotary lever 33. The one on the operating lever 36 on the other side is used to trigger the height adjustment the chair column 4.

Abstract

The joint between the base and seat supports (2,6) consists of a slotted (25) twist joint (22). The slot also contains the seat support (6) bearing pin (26) so the joint (22) has to be moved horizontally back in the slot to lower the seat support. The joint as such is integrated with the front joint (12) between the front rod (8) and backrest support (7) and the interval (a) between joints (12 and 13) and rods (7,8) equals the length (L) of the rear rod (10) and is greater than the length (L8) of the front rod (8).

Description

Die Erfindung betrifft eine Synchronmechanik für eine korrelierte Sitz-Rückenlehnen-Bewegung eines Bürostuhles mit den im Oberbegriff des Anspruches 1 angegebenen Merkmalen, wie sie aus der DE 199 21 153 A1 bekannt sind.The invention relates to a synchronous mechanism for a correlated seat-backrest movement an office chair with the in the preamble of Features specified claim 1, as they from DE 199 21 153 A1 are 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 plaziert, 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.Assemblies in the seat substructure are called "synchronous mechanics" of an office chair understood for a coupled, a certain relative movement of the seat and backrest to each other associated kinematics. There is a base support on a chair column placed on which, on the one hand, a pivotable about a transverse axis, articulated to the base support and to the other one also pivotable about a transverse axis, articulated with the base support connected backrest supports are stored. On the seat support is the usually office chair with a padded seat assembled. The backrest support, which differs commonly from the the actual synchronous mechanism extends to the rear, carries on to one the arm of the office chair runs at the top.

Sitzträger und Rückenlehnenträger sind derart gelenkig gekoppelt, daß eine Schwenkbewegung der Rückenlehne nach hinten - wie sie beispielsweise durch ein Anlehnen des Stuhlbenutzers an die Ruckeniehne nervorgerufen 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 articulated so that a Swiveling movement of the backrest to the rear - as for example nervous by leaning the chair user against the backrest can be - a lowering movement of the rear edge of the seat down induced. This correlated seat-backrest movement brings you considerable comfort advantage and is for orthopedic reasons he wishes.

Ein vielfach bei Synchronmechaniken nach dem Stand der Technik auftretendes Problem besteht in dem oft sehr beschränkten Schwenkwinkel der Rückenlehne. Darüber hinaus ist die Absenkbewegung der Sitzfläche auch bei einem relativ großen Rückenlehnen-Schwenkwinkel oftmals zu gering, was auf die schwenkbare Lagerung des Sitz-und Rückenlehnenträgers in jeweils nur einem Schwenkgelenk am Basisträger zurückzuführen ist.A common occurrence in synchronous mechanisms according to the prior art The problem is the often very limited swivel angle of the Backrest. In addition, the lowering movement of the seat is also often too small with a relatively large backrest swivel angle, which points to the pivoting mounting of the seat and backrest support only one swivel joint can be attributed to the base support.

Die vorstehenden Zielsetzungen werden bei der in der eingangs genannten Druckschrift vorgesehenen Lagerung des Rückenlehnenträgers über eine Lenkeranordnung am Basisträger erreicht, die eine Viergelenk-Kette definiert. Die Lenkeranordnung besteht aus zwei am Basisträger angelenkten Lenkern und dem Rückenlehnenträger selbst als Koppel der Viergelenk-Kette. Die Längsachsen der beiden Lenker stehen in einem sich nach oben zum Sitz hin öffnenden, spitzen Winkel.The above objectives are at the above mentioned Document provided storage of the backrest support via a Handlebar arrangement reached on the base support, which defines a four-link chain. The handlebar arrangement consists of two hinged to the base bracket Handlebars and the backrest support itself as a coupling of the four-link chain. The longitudinal axes of the two handlebars stand up in one acute angle opening towards the seat.

Durch die vorstehende Lagerung des Rückenlehnenträgers in Form einer Viergelenk-Kette ist grundsätzlich ein großer Schwenkwinkel erreichbar, wobei der Rückenlehnenträger sich nicht nur um eine feste Schwenkachse dreht, sondern eine zusätzliche Kippbewegung nach hinten vollführt. Diese Dreh-Kipp-Bewegung wird durch die sich nach oben öffnenden Lenker ausgeprägt möglich.Due to the above storage of the backrest support in the form of a Four-link chain can basically reach a large swivel angle, the backrest support is not only about a fixed pivot axis turns, but performs an additional tilting movement to the rear. This The handlebars open and upwards turn and tilt pronounced possible.

Dabei ist ferner vorgesehen, daß der Sitzträger an seinen vorderen Endbereich uber einen weiteren Lenker am Basisträger angelenkt ist. In dei aufrechten Position der Synchronmechanik ist dieser Lenker nach vorne geneigt. Mit seinem hinteren Endbereich ist der Sitzträger am Rückenlehnenträger angelenkt. It is also provided that the seat support at its front end region is articulated on the base support via another handlebar. In your upright position Position of the synchronous mechanism, this handlebar is inclined forward. With its rear end area, the seat support is on the backrest support hinged.

Durch die nach vorne geneigte Anordnung des vorderen Lenkers ergibt sich, daß ausgehend von der aufrechten Position der Synchronmechanik-also der Grundposition - der Sitz mit seiner Vorderkante zumindest am Anfang der korrelierten Sitz-Rückenlehnen-Bewegung eine ausgeprägte Hubbewegung nach oben vollführt. Dies hat den Effekt, daß der Benutzer beim Betätigen der Synchronmechanik durch Zurückdrücken der Rückenlehne gegen sein eigenes, auf dem Sitz aufliegendes Gewicht arbeiten muß.Due to the forward inclined arrangement of the front handlebar yourself that starting from the upright position of the synchronous mechanism-so the basic position - the seat with its front edge at least at the beginning the correlated seat-backrest movement a pronounced lifting movement carried out upwards. This has the effect that the user Actuation of the synchronous mechanism by pushing back the backrest must work against its own weight on the seat.

Aufgrund individuell verschiedener Vorlieben von Person zu Person wird dieser Effekt teilweise als nachteilig empfunden. Dies gilt auch für die oben erwähnte ausgeprägte Hubbewegung des Sitzträgers und damit der Sitzfläche eines Bürostuhls am Anfang der Sitz-Rückenlehnen-Synchronbewegung.Due to individual preferences from person to person this effect is sometimes seen as disadvantageous. This also applies to the above mentioned pronounced lifting movement of the seat carrier and thus the Seat of an office chair at the beginning of the seat-backrest synchronous movement.

Schließlich stellt die gelenkige Lagerung des Sitzträgers mit insgesamt drei Lenker-Paaren beiderseits der Sitz-Mittellängsebene eine relativ aufwendige Konstruktion dar.Finally, the articulated storage of the seat carrier provides a total of three Handlebar pairs on both sides of the seat median longitudinal plane a relatively complex Construction.

Aus der DE 198 10 768 A1 ist eine Synchronmechanik bekannt, bei der der Rückenlehnenträger in einem einzigen Gelenkpunkt am Basisträger angelenkt ist und damit eine reine Schwenkbewegung vollführt. Der Sitzträger dieser Synchronmechanik ist am hinteren Ende über einen Gelenkpunkt mit dem Rückenlehnenträger gekoppelt. Am vorderen Ende ist er in einer schräg von vorne unten nach hinten oben ansteigenden Langloch-Steuerkurve geführt. Insgesamt ist diese Rückenlehnen-Sitzträger-Anlenkung zwar konstruktiv einfacher aufgebaut, weist aber auch eine gegenüber den praktischen Anforderungen weniger gut angepaßte Kinematik auf. Insbesondere die ansteigende Langloch-Steuerkurve zur Lagerung des Vorderendes des Sitzträgers führt zu der bereits im Zusammenhang mit der Konstruktion nach DE 199 21 153 A1 diskutierten Hubbewegung der Sitzvorderkante.A synchronous mechanism is known from DE 198 10 768 A1, in which the Backrest support articulated to the base support in a single hinge point is and thus performs a pure swivel movement. The seat support this synchronous mechanism is at the rear end with a hinge point coupled to the backrest support. At the front end it is in one oblong control curve rising diagonally from the bottom to the top guided. Overall, this backrest-seat support linkage Although structurally simpler, it also has one opposite Kinematics less well adapted to practical requirements on. In particular, the rising elongated control curve for mounting the The front end of the seat carrier leads to the one already associated with the Construction according to DE 199 21 153 A1 discussed lifting movement of the front edge of the seat.

Ausgehend von den geschilderten Problemen beim Stand der Technik liegt der Erfindung die Aufgabe zugrunde, eine Synchronmechanik der gattungsgemäßen Art so zu verbessern, daß unter konstruktiver Vereinfachung die anfängliche Hubbewegung des Sitzträgers vermieden wird.Based on the problems described in the prior art the invention has for its object a synchronous mechanism of the generic type Art to improve so that under constructive simplification the initial lifting movement of the seat carrier is avoided.

Diese Aufgabe wird laut Kennzeichnungsteil des Anspruches 1 durch die Ausbildung des Gelenks zwischen Basisträger und Sitzträger am Vorderende als ein Dreh-Schiebe-Gelenk gelöst, das so ausgelegt ist, daß der Absenkbewegung des Sitzträgers eine horizontale Schiebebewegung nach hinten überlagert ist. Vorzugsweise wird das Dreh-Schiebe-Gelenk durch eine horizontale, in Längsrichtung des Sitzes verlaufende, langlochartige Kulisse im Sitzträger gebildet, in der ein Lagerzapfen des Sitzträgers geführt ist.This task is according to the characterizing part of claim 1 by Formation of the joint between the base support and seat support at the front end solved as a rotary slide joint, which is designed so that the Lowering movement of the seat support after a horizontal sliding movement is superimposed on the back. The rotary-slide joint is preferably by a horizontal, slot-like, running in the longitudinal direction of the seat Backdrop formed in the seat support, in which a bearing journal of the seat support is guided is.

Durch die vorstehend erörterte Auslegung der gelenkigen Anbindung des Sitzträgers an dem Basisträger wird einerseits die eingangs erörterte Hubbewegung vermieden, was die gewünschte Komfort-Verbesserung mit sich bringt. Ferner ist ein Dreh-Schiebe-Gelenk insbesondere in der vorstehend aufgezeigten Ausführungsform konstruktiv sehr einfach realisierbar.By the interpretation of the articulated connection of the The seat support on the base support becomes the lifting movement discussed at the beginning avoided what the desired comfort improvement entails brings. Furthermore, a rotary slide joint is particularly in the above shown embodiment constructively very easy to implement.

Weitere bevorzugte Ausführungsformen, die die Anordnung und Dimensionierung der Gelenke und Lenker der zwischen Basisträger und Rückenlehnenträger bzw. Sitzträger vorgesehenen Viergelenk-Kette betreffen, dienen der Erzielung eines besonders kompakten Aufbaus bei einem vergleichsweise zum Stand der Technik gemäß DE 199 21 153 A1 vergrößerten Verhältnis vom Schwenkwinkel der Rückenlehne zum Schwenkwinkel des Sitzträgers.Further preferred embodiments, the arrangement and dimensioning the joints and handlebars between the base support and backrest support or seat carrier provided four-link chain, serve to achieve a particularly compact structure in a comparative enlarged to the prior art according to DE 199 21 153 A1 Ratio of the swivel angle of the backrest to the swivel angle of the seat holder.

Schließlich kann der Basisträger durch die außenseitige Anbringung der Lenker und des Rückenlehnenträgerteils ebenfalls besonders kompakt und als zentrales "Rückgrat" der Synchronmechanik dienen. Dabei wird durch die bevorzugte Ausbildung der Lenker als verbreitertes Flächengebilde einerseits ein zusätzliches Design-Element geschaffen, andererseits unter Arbeitsschutz-Gesichtspunkten ein Einklemmen der Finger in der Synchronmechanik zuverlässig verhindert.Finally, the base support can be attached on the outside Handlebar and the backrest support part also particularly compact and serve as the central "backbone" of the synchronous mechanism. This is done by the preferred design of the handlebars as a widened sheet on the one hand created an additional design element, on the other hand under Occupational safety aspects pinching the fingers in the synchronous mechanism reliably prevented.

Weitere Merkmale, Einzelheiten und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung, in der ein Ausführungsbeispiel des Erfindungsgegenstandes anhand der beigefügten Zeichnungen näher erläutert wird. Es zeigen:

Fig. 1
eine schematische Seitenansicht der Synchronmechanik in Grundstellung,
Fig. 2
eine Seitenansicht analog Fig. 1 in nach hinten geschwenkter Stellung der Synchronmechanik und
Fig. 3
eine schematische Draufsicht auf die Synchronmechanik gemäß Fig. 2.
Further features, details and advantages of the invention will become apparent from the following description in which an embodiment of the subject matter of the invention is explained in more detail with reference to the accompanying drawings. Show it:
Fig. 1
a schematic side view of the synchronous mechanism in the basic position,
Fig. 2
a side view analogous to FIG. 1 in the pivoted position of the synchronous mechanism and
Fig. 3
3 shows a schematic top view of the synchronous mechanism according to FIG. 2.

Der grundsätzliche Aufbau der als Ganzes mit 1 bezeichneten Synchronmechanik ist anhand von Fig. 1 und 3 zu erläutern. Sie weist demnach einen Basisträger 2 auf, der mittels einer Konusaufnahme 3 auf das obere Ende einer Stuhlsäule 4 gesetzt ist. Außerhalb und oberhalb der seitlichen, parallel zur Längsrichtung L des Stuhles verlaufenden Wangen 5 liegen verschiedene Konstruktionsteile der Synchronmechanik 1. Kernstücke davon sind zum einen ein im wesentlichen rahmenförmiger Sitzträger 6 und ein in Draufsicht gabelförmiger Rückenlehnenträger 7. Auf dem Sitzträger 6 ist der mit einer gepolsterten Sitzfläche versehene Sitz (nicht dargestellt) montiert. Der Rückenlehnenträger 7 hält über eine abgewinkelte Traverse 18 eine ebenfalls nicht dargestellte Rückenlehne, die bei modernen Bürostühlen höhenverstellbar ist.The basic structure of the synchronous mechanism designated as a whole by 1 is to be explained with reference to FIGS. 1 and 3. Accordingly, it shows one Base carrier 2, which by means of a cone holder 3 on the upper End of a chair column 4 is set. Outside and above the side, Cheeks 5 running parallel to the longitudinal direction L of the chair Various construction parts of the synchronous mechanism 1. Core pieces of it are a substantially frame-shaped seat support 6 and a fork-shaped backrest support in plan view 7. On the seat support 6 is the padded seat (not shown) assembled. The backrest support 7 holds via an angled cross member 18 a backrest, also not shown, in modern office chairs is adjustable in height.

Wie insbesondere aus Fig. 3 deutlich wird, ist die gesamte Synchronmechanik 1 bezüglich der Mittel-Längsebene M, was die eigentliche Kinematik betrifft, spiegelsymmetrisch aufgebaut. Insoweit ist bei der folgenden Beschreibung immer von beiderseits paarweise vorhandenen Konstruktionselementen auszugehen.As is particularly clear from FIG. 3, the entire synchronous mechanism is 1 with respect to the central longitudinal plane M, which is the actual kinematics affects, mirror-symmetrical. To that extent, the following Description of construction elements always present in pairs on both sides go out.

Der Rückenlehnenträger 7 ist also über eine Lenkeranordnung gelenkig mit dem Basisträger 2 verbunden. Diese Lenkeranordnung weist einen ersten Lenker 8 auf, der etwa mittig an einem Schwenklager 9 am Basisträger 2 angelenkt ist. Ein zweiter Lenker 10 ist zwischen vorderem Lenker 8 und Konusaufnahme 3 an einem Schwenklager 11 am Basisträger 2 gelagert. Die freien Enden der beiden Lenker 8, 10 sind über Gelenke 12, 13 mit dem Rückenlehnenträger 7 gekoppelt. Die beiden Schwenklager 9, 11 und die Gelenke 12, 13 definieren eine Viergelenk-Kette, bei der der Rückenlehnenirager 7 mit seinem jeweiligen Gabelschenkel 14 selbst die Koppel bildet. In der in Fig. 1 gezeigten Grundstellung des Rückenlehnenträgers 7 steht der vordere Lenker 8 etwa vertikal nach oben, während der hintere Lenker 10 nach hinten geneigt verläuft. Die beiden durch die Gelenkpunkte verlaufenden Längsachsen 15, 16 der Lenker 8, 10 bilden dabei einen sich nach oben zum Sitzträger 6 hin öffnenden, spitzen Winkel W (Fig. 1) von etwas über 30°. Das Längenverhältnis zwischen vorderem und hinterem Lenker 8, 10 beträgt etwa 2,5 : 3. Aufgrund der vorstehenden Auslegung und Anordnung der Viergelenk-Kette vollführt der Rückenlehnenträger 7 die in Fig. 1 durch den Pfeil 17 angedeutete überlagerte Dreh- und Schwenkbewegung nach hinten unten.The backrest support 7 is thus articulated with a handlebar arrangement connected to the base support 2. This handlebar arrangement has a first Link 8, which is approximately in the middle of a pivot bearing 9 on the base support 2 is articulated. A second link 10 is between the front link 8 and Cone seat 3 mounted on a pivot bearing 11 on the base support 2. The free ends of the two links 8, 10 are connected via joints 12, 13 coupled to the backrest support 7. The two pivot bearings 9, 11 and the joints 12, 13 define a four-link chain in which the backrest manager 7 itself with its respective fork leg 14 forms. In the basic position of the backrest support 7 shown in FIG. 1 the front link 8 is approximately vertically upwards, while the rear one Handlebar 10 is inclined to the rear. The two through the hinge points extending longitudinal axes 15, 16 of the links 8, 10 form one opening upwards towards the seat support 6, acute angle W (FIG. 1) of just over 30 °. The aspect ratio between the front and rear Handlebars 8, 10 is about 2.5: 3. Because of the above interpretation and arrangement of the four-link chain is carried out by the backrest support 7 the indicated in Fig. 1 by the arrow 17 superimposed rotary and Swiveling movement backwards and downwards.

Wie ferner aus Fig. 1 hervorgeht, ist der Sitzträger 6 vor seinem hinteren Ende 19 mit dem Rückenlehnenträger 7 über ein Lagerauge 20 an die das vordere Gelenk 12 bildende Achse gekoppelt und so mit seinem hinteren Endbereich angelenkt. Das Gelenk zwischen Sitzträger 6 und Rückenlehnenträger 7 ist also in das vordere Gelenk 12 zwischen Lenker 8 und Rückenlehnenträger 7 integriert. An seinem vorderen Endbereich 21 - also links in Fig. 1 - ist der Sitzträger 6 mit dem Basisträger 2 über ein als Ganzes mit 22 bezeichnetes Dreh-Schiebe-Gelenk verbunden. Dieses besteht einerseits aus einer in den beiderseitigen Längsstreben 23, 24 (Fig. 3) eingeformten, langlochartigen Kulisse 25, in die andererseits von innen her ein Lagerzapfen 26 eingreift. Letzterer ist jeweils an einem Lagerfortsatz 27 des Basisträgers 2 angeformt und steht rechtwinklig zur Mittel-Längsebene M von diesem nach außen ab und in die Kulisse 25 hinein.1, the seat support 6 is in front of its rear End 19 with the backrest support 7 via a bearing eye 20 to the front joint 12 forming axis coupled and so with its rear Articulated end area. The joint between seat support 6 and backrest support 7 is thus in the front joint 12 between the handlebar 8 and backrest support 7 integrated. At its front end region 21 - that is 1 in the left is the seat support 6 with the base support 2 over one as a whole connected with 22 designated rotary-slide joint. This exists on the one hand from a molded in the longitudinal struts 23, 24 (FIG. 3) on both sides, slot-like backdrop 25, in the other hand from the inside a journal 26 engages. The latter is on a bearing extension 27 of the base support 2 is formed and is perpendicular to the central longitudinal plane M from this outwards and into the scenery 25.

Die Synchronmechanik 1 ist durch eine Federanordnung F entgegen der Pfeilrichtung 17 - also zur Grundposition der Synchronmechanik 1 hinvorgespannt. Diese Federanordnung F ist in Form zweier in Querrichtung miteinander fluchtender Schenkelfedern 28 (Fig. 3) gegeben, die um die das Schwenklager 9 des vorderen Lenkers 8 bildende Achse positioniert sind. Der nach oben weisende Schenkel 29 stützt sich an einem Vorsprung 30 am Sitzträger 6 ab, während der zweite, nach vorne verlaufende Schenkel 31 sich in einer Verstellmechanik 32 im Basisträger 2 abstützt. Die Schenkelfedern 28 üben eine Federkraft entgegen der nach hinten gerichteten Schwenkbewegung der Rückenlehne aus, die durch die Verstellmechanik 32 mittels Betätigung durch einen Drehhebel 33 variierbar ist.The synchronous mechanism 1 is countered by a spring arrangement F. Arrow direction 17 - that is, pretensioned to the basic position of the synchronous mechanism 1. This spring arrangement F is in the form of two in the transverse direction mutually aligned leg springs 28 (Fig. 3) given around the the pivot bearing 9 of the front link 8 forming axis positioned are. The upward-pointing leg 29 is supported on a projection 30 on the seat support 6, while the second, forward leg 31 is supported in an adjustment mechanism 32 in the base support 2. The Leg springs 28 exert a spring force against that directed towards the rear Swivel movement of the backrest made by the adjustment mechanism 32 can be varied by actuation by a rotary lever 33.

Wie nun aus einem Vergleich der Fig. 1 und 2 deutlich wird, führt der Rückenlehnenträger 7 bei einer Beaufschlagung der Rückenlehne nach hinten die mit dem Pfeil 17 angedeutete Schwenk-Drehbewegung nach hinten unten aus, wobei sich der hintere Lenker 10 der Viergelenk-Kette weiter nach hinten und der vordere Lenker 8 sich ebenfalls nach hinten umlegen. Bei maximalem Schwenkwinkel des Rückenlehnenträgers 7 beträgt der Winkel W zwischen den Längsachsen 15, 16 der beiden Lenker 8, 10 etwa 20° (Fig. 2). Die Viergelenk-Kette faltet sich also gewissermaßen gegenüber der weiter gespreizten Ausgangsstellung gemäß Fig. 1 zusammen, so daß diese ohnehin schon kompakte Anordnung noch weiter verkleinert wird.As can now be seen from a comparison of FIGS. 1 and 2, the backrest support leads 7 when the backrest is loaded to the rear the swivel-rotary movement indicated by arrow 17 to the rear below, with the rear link 10 of the four-bar chain continuing to the rear and the front handlebar 8 also fold backwards. At the maximum swivel angle of the backrest support 7, the Angle W between the longitudinal axes 15, 16 of the two links 8, 10 approximately 20 ° (Fig. 2). The four-link chain folds, so to speak the further spread starting position according to FIG. 1 together, so that this already compact arrangement is further reduced becomes.

Zu der kompakten Anordnung trägt auch bei, daß der Abstand a der beiden Gelenke 12, 13, die zwischen Rückenlehnenträger 7 und den Lenkern 8 bzw. 10 sitzen, etwa gleich der Länge L10 des hinteren Lenkers 10 und in dem bereits angegebenen Verhältnis größer als die Länge L8 des vorderen Lenkers 8 ist.The compact arrangement also contributes to the fact that the distance a between the two Joints 12, 13 between the backrest support 7 and the handlebars 8 or 10 sit, approximately equal to the length L10 of the rear link 10 and in the ratio already given is greater than the length L8 of the front Handlebar 8 is.

Durch die erwähnte Schwenkbewegung der Viergelenk-Kette mit dem Rückenlehnenträger 7 wird auch der Sitzträger 6 sowohl nach hinten unten abgeschwenkt als auch im Bereich des Dreh-Schiebe-Gelenks 22 horizontal nach hinten verschoben. Dadurch ergibt sich keine relevante Hubbewegung des vorderen Endes 21 der Sitzfläche, wodurch irgendwelche Einschnürungen oder Druck auf die Unterseite der Oberschenkel vermieden werden. Due to the mentioned pivoting movement of the four-link chain with the backrest support 7, the seat support 6 is both down towards the rear pivoted as well as horizontally in the region of the rotary sliding joint 22 moved backwards. This means that there is no relevant stroke movement of the front end 21 of the seat, causing any constrictions or avoid pressure on the underside of the thighs become.

Die Synchronmechanik 1 ist im übrigen so ausgelegt, daß in der in Fig. 2 gezeigten zurückgeschwenkten Endstellung der Rückenlehnenträger 7 einen Schwenkwinkel W7 von ca. 26° durchläuft, während der Schwenkwinkel W6 des Sitzträgers 6 ca. 15° beträgt. Bemerkenswert dabei ist, dass sich das Verhältnis der Schwenkwinkel von Rückenlehnen- und Sitzträger während der Schwenkbewegung ändert. So liegt das Verhältnis anfänglich bei einem Wert von etwa 3,5 : 1, reduziert sich etwa in der Mitte des Schwenkbereichs auf Werte um 2 : 1, um schließlich am Ende, also bei maximaler Schwenkung, ein Verhältnis W7 : W6 von etwa 1,8 : 1 zu erreichen. Dies hat den Vorteil, dass ein hoher Absenkwinkel des Sitzträgers erreicht werden kann, ohne dass der Schwenkwinkel der Rückenlehne zu groß werden muß, was zu einer liegeähnlichen Position führen würde. Grund für dieses niedrige Endverhältnis der Schwenkwinkel ist die Schiebebewegung des Sitzträgers während des Absenkens. Damit wird auch der sogenannte "Hemdauszieheffekt" wirkungsvoll vermieden.The synchronous mechanism 1 is otherwise designed so that in Fig. 2nd shown swung back end position of the backrest support 7 a Swivel angle W7 of approx. 26 ° passes during the swivel angle W6 of the seat support 6 is approximately 15 °. It is remarkable that the ratio of the swivel angle of the backrest and seat support during the pivoting movement changes. So the relationship is initially a value of approximately 3.5: 1, is reduced approximately in the middle of the Swivel range to values around 2: 1, finally at the end, i.e. at maximum swivel to achieve a ratio W7: W6 of about 1.8: 1. This has the advantage that the seat support has a high lowering angle can be achieved without the swivel angle of the backrest too must be large, which would lead to a couch-like position. The reason for this low final ratio of the swivel angle is the sliding movement of the seat support during lowering. With that the so-called "shirt pull-out effect" effectively avoided.

Wie aus Fig. 1 und 3 deutlich wird, sind die außen am Sitzträger 6 angebrachten Lenker 8, 10 als verbreiterte Flächengebilde etwa in Nierenform ausgebildet, wobei sie sich in allen Schwenkstellungen zwischen den beiden Positionen gemäß Fig. 1 und 2 gegenseitig und in Verbindung mit den außen an den Lenkern 8, 10 angreifenden Lagerwangen 34 des gabelartigen Rückenlehnenträgers 7 derart überlappen, daß keine Durchgriffsmöglichkeiten zwischen Lenkern 8, 10, Basisträger 2 und Rückenlehnenträger 7 vorhanden sind. Damit sind die Finger der auf dem Stuhl sitzenden Person wirkungsvoll gegen ein Einklemmen beim Verschwenken der Synchronmechanik geschützt.As is clear from FIGS. 1 and 3, the ones attached to the outside of the seat support 6 Handlebars 8, 10 as widened flat structures approximately in kidney shape trained, being in all pivot positions between the two Positions according to FIGS. 1 and 2 mutually and in connection with the outside of the handlebars 8, 10 bearing cheeks 34 of the fork-like Backrest support 7 overlap in such a way that no access options between handlebars 8, 10, base support 2 and backrest support 7 available. This is the fingers of the person sitting on the chair effective against jamming when pivoting the synchronous mechanism protected.

In nicht näher dargestellter Weise ist die Synchronmechanik 1 in verschiedenen Positionen zwischen der Grundposition (Fig. 1) und der maximal nach hinten verschwenkten Position (Fig. 2) feststellbar. Die entsprechende Arretiereinrichtung ist in den Figuren nicht explizit gezeigt und bedarf- da sie zum Stand der Technik gehört - keiner eingehenden Erörterung. Es wird lediglich darauf hingewiesen, daß die Feststellung mit dem weiteren Bedienungshebel 35 auf der Seite des Drehhebels 33 erfolgt. Der auf der anderen Seite sitzende Bedienungshebel 36 dient zur Auslösung der Höhenverstellung der Stuhlsäule 4.In a manner not shown, the synchronizing mechanism 1 is in different Positions between the basic position (Fig. 1) and the maximum position pivoted to the rear (FIG. 2). The corresponding Locking device is not shown explicitly in the figures and is required it belongs to the state of the art - no detailed discussion. It it is only pointed out that the determination with the further Operating lever 35 on the side of the rotary lever 33. The one on the operating lever 36 on the other side is used to trigger the height adjustment the chair column 4.

Claims (6)

Synchronmechanik für die korrelierte Sitz-Rückenlehnen-Bewegung eines Bürostuhls mit einem auf einer Stuhlsäule (4) plazierbaren Basisträger (2), einem um eine Querachse schwenkbaren, bei seinem vorderen Ende (21) gelenkig mit dem Basisträger (2) verbundenen Sitzträger (6), einem ebenfalls um eine Querachse schwenkbaren, gelenkig mit dem Basisträger (2) verbundenen Rückenlehnenträger (7), der mit dem Sitzträger (6) derart gekoppelt ist, dass eine Schwenkbewegung der Rückenlehne nach hinten eine Absenkbewegung des rückwärtigen Bereichs des Sitzträgers (6) induziert, wobei der Rückenlehnenträger (7) über eine eine Viergelenk-Kette definierende Lenkeranordnung (8, 10) am Basisträger (2) schwenkbar gelagert ist, wobei die Lenkeranordnung (8, 10) aus vorderen und hinteren, am Basisträger (2) angelenkten Lenkern (8, 10) und dem Rückenlehnenträger (7) selbst als Koppel der Viergelenk-Kette besteht, und wobei der Sitzträger (6) mit seinem hinteren Endbereich (19) am Rückenlehnenträger (7) angelenkt ist,    dadurch gekennzeichnet, dass das Gelenk zwischen Basisträger (2) und Sitzträger (6) derart als ein Dreh-Schiebe-Gelenk (22) ausgebildet ist, dass der Absenkbewegung des Sitzträgers (6) eine horizontale Schiebebewegung nach hinten überlagert ist. Synchronous mechanism for the correlated seat-backrest movement of an office chair a base support (2) which can be placed on a chair column (4), a seat support (6) pivotable about a transverse axis and articulated at its front end (21) to the base support (2), a backrest support (7) which is also pivotable about a transverse axis and is articulated to the base support (2) and which is coupled to the seat support (6) such that a pivoting movement of the backrest induces a lowering movement of the rear region of the seat support (6), the backrest support (7) being pivotably mounted on the base support (2) via a link arrangement (8, 10) defining a four-link chain, wherein the handlebar arrangement (8, 10) consists of front and rear links (8, 10) articulated on the base support (2) and the backrest support (7) itself as a coupling of the four-link chain, and wherein the seat support (6) is articulated with its rear end region (19) on the backrest support (7), characterized in that the joint between the base support (2) and the seat support (6) is designed as a rotary-slide joint (22) such that the lowering movement of the seat support (6) is superimposed on a horizontal sliding movement to the rear. Synchronmechanik nach Anspruch 1,
dadurch gekennzeichnet, dass
das Dreh-Schiebe-Gelenk (22) eine horizontal in Längsrichtung verlaufende, langlochartige Kulisse (25) im Sitzträger (6) aufweist, in der ein Lagerzapfen (26) des Sitzträgers (6) geführt ist.Synchronous mechanism according to claim 1,
characterized in that
the rotary slide joint (22) has a slot-like link (25) running horizontally in the longitudinal direction in the seat support (6), in which a bearing journal (26) of the seat support (6) is guided. Synchronmechanik nach Anspruch 1 oder 2,
dadurch gekennzeichnet, dass
das Gelenk zwischen Sitzträger (6) und Rückenlehnenträger (7) in das vordere Gelenk (12) zwischen vorderem Lenker (8) und Rückenlehnenträger (7) integriert ist.Synchronous mechanism according to claim 1 or 2,
characterized in that
the joint between seat support (6) and backrest support (7) is integrated into the front joint (12) between front handlebar (8) and backrest support (7). Synchronmechanik nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet, dass
der Abstand (a) der beiden Gelenke (12, 13) zwischen Rückenlehnenträger (7) und den beiden Lenkern (8, 10) etwa gleich der Länge (L 10) des hinteren Lenkers (10) und größer als die Länge (L8) des vorderen Lenkers (8) ist.Synchronous mechanism according to one of claims 1 to 3,
characterized in that
the distance (a) of the two joints (12, 13) between the backrest support (7) and the two links (8, 10) is approximately equal to the length (L 10) of the rear link (10) and greater than the length (L8) of the front handlebar (8). Synchronmechanik nach einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet, dass
die Lenker (8, 10) beiderseits außen am Sitzträger (6) angebracht sind, wobei wiederum der Ruckenlehnenträger (7) über außen an den Lenkern (8, 10) angreifende Lagerwangen (34) an diese angebunden ist.Synchronous mechanism according to one of claims 1 to 4,
characterized in that
the handlebars (8, 10) are attached to the outside of the seat support (6) on both sides, the backrest support (7) in turn being connected to the handlebars (34) via external bearing cheeks (34). Synchronmechanik nach Anspruch 5,
dadurch gekennzeichnet, dass
die Lenker (8, 10) in Draufsicht bezogen auf ihre Gelenkachse als verbreiterte Flächengebilde derart ausgestaltet sind, dass in keiner relativen Schwenkstellung der von ihnen gebildeten Viergelenkkette eine Durchgriffsmöglichkeit zwischen Lenker (8, 10), Basisträger (2) und Rückenlehnenträger (7) existiert.Synchronous mechanism according to claim 5,
characterized in that
the handlebars (8, 10) in plan view with respect to their hinge axis are designed as widened flat structures in such a way that there is no possibility of reaching through between the handlebars (8, 10), base support (2) and backrest support (7) in any relative pivoting position of the four-link chain they form ,
EP02009186A 2001-05-18 2002-04-25 Synchronised mechanism for a coupled seat- and backrest-movement in an office chair Expired - Fee Related EP1258210B1 (en)

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DE10125994A DE10125994A1 (en) 2001-05-18 2001-05-18 Synchronous mechanism for a correlated movement of the seat backrest of an office chair

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US5308144A (en) * 1989-05-20 1994-05-03 Roeder Gmbh Chair, in particular work or office chair
US5971481A (en) * 1996-10-11 1999-10-26 Giroflex Entwicklungs Ag Chair, specially an office chair
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WO2000022959A1 (en) * 1998-10-20 2000-04-27 Protoned B.V. Chair mechanism
DE19921153A1 (en) * 1999-05-07 2000-11-09 Bock 1 Gmbh & Co Adjustment mechanism for swivel chair, comprising specific arrangement of springs and joint elements for synchronized motion of seat and back

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1985206A1 (en) * 2006-02-15 2008-10-29 Vicente Berbegal Perez Office chair
EP1985206A4 (en) * 2006-02-15 2012-10-31 Perez Vicente Berbegal Office chair
EP2250940A3 (en) * 2009-05-13 2011-07-20 Bock-1 GmbH & Co. KG Synchronisation mechanism
US8550557B2 (en) 2009-05-13 2013-10-08 Bock 1 Gmbh & Co. Kg Synchronous mechanism

Also Published As

Publication number Publication date
EP1258210B1 (en) 2006-03-15
US6886888B2 (en) 2005-05-03
DE50206055D1 (en) 2006-05-11
EP1258210A3 (en) 2004-01-14
DE10125994A1 (en) 2002-11-21
US20020171276A1 (en) 2002-11-21

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