EP1537804A1 - Synchronised mechanism for an office chair - Google Patents

Synchronised mechanism for an office chair Download PDF

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Publication number
EP1537804A1
EP1537804A1 EP04025029A EP04025029A EP1537804A1 EP 1537804 A1 EP1537804 A1 EP 1537804A1 EP 04025029 A EP04025029 A EP 04025029A EP 04025029 A EP04025029 A EP 04025029A EP 1537804 A1 EP1537804 A1 EP 1537804A1
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EP
European Patent Office
Prior art keywords
support
seat
synchronous mechanism
mechanism according
eccentric
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Granted
Application number
EP04025029A
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German (de)
French (fr)
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EP1537804B1 (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 EP1537804A1 publication Critical patent/EP1537804A1/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
    • A47C1/03261—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
    • A47C1/03255—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
    • A47C1/03294—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest slidingly movable in the base frame, e.g. by rollers

Definitions

  • the invention relates to a synchronous mechanism for office chairs with the im
  • the preamble of claim 1 specified features, as described in DE 198 10 768 A1 or DE 101 25 994 A1 are known.
  • synchronous mechanism assemblies are in the seat substructure of an office chair meant for a coupled, a certain relative movement of the seat and backrest to each other provide with bringing kinematics.
  • This is on a chair column a base support placed on the one to a pivotable about a transverse axis, hingedly connected to the base support seat support and on the other also pivotable about a transverse axis, hinged to the base support connected backrest support are stored.
  • On the seat carrier is the usually with a padded seat provided seat of the office chair assembled.
  • the backrest support which is commonly used by the Actual synchronous mechanism extends to the rear, contributes to one after Above extending boom, 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 for example caused by leaning on the chair user to the backrest can be - a lowering movement of the rear edge of the seat down induced.
  • This correlated seat-back movement brings one considerable comfort advantage with it and is for orthopedic reasons he wishes.
  • the provided in the construction according to DE 101 25 994 A1 spring arrangement is based on two torsion springs, which housed in the base plate are.
  • the one leg of the spring is in an adjustment in the base support housed, whereas the second leg upwards in the direction Seat support protrudes, which has a corresponding abutment on this Leg supports and thus against its backward Swing direction is applied.
  • the invention is based on the object, a synchronous mechanism for Office chairs to improve so that the spring arrangements in a constructive Simplicity particularly compact and especially in a narrower spatial To arrange proximity under the seat carrier, so that the area of the base carrier essentially free, while achieving the greatest possible freedom of design remains.
  • the entire spring arrangement on the one hand constructively less expensive, because on the one hand with a simple design and with little constructive means to the elements of the synchronous mechanism bindable tension springs is worked.
  • These need For example, only between two corresponding hook-shaped bearing on Base support or backrest or seat support to be hung. Further is by the arrangement flat under the top of the seat support one particularly space-saving and compact design of the spring arrangement guaranteed.
  • the term "under the top” is intended to be understood be that the tension springs either under one through the top surface the seat support formed cover, but also in an upwardly open Inclusion of the usually made of an injection molded part complex and with integrally molded structural elements, such as Stiffening ribs, axle mountings etc. provided seat support can be arranged.
  • a base support 1 which is in the area its rear end with a cone holder 2 for attaching the synchronous mechanism on the upper end of a (not shown) chair column is provided.
  • Other basic components of the synchronous mechanism are the Backrest support 3 and the seat support 4.
  • the backrest support 3 is shortly before the cone seat 2 via a transverse axis 5 pivotally on the base support 1 stored. He has two in a curve back upwards running Side struts 6, 7 on which the backrest, not shown attached is.
  • the base support 1 takes in its side view (FIG. 1) the arch shape of the Backrest support 3 on and leads to the front above, where in his front End a crosshead 8 is integrally formed.
  • This one is wearing Transverse axis 9, which fulfills several functions, namely on the one hand, the rotary-sliding storage the seat support 4 and the other as an abutment for to be explained in more detail tension spring assembly 10 with adjustment 12th
  • this has in The area of its front end has two downwardly projecting, lateral cheeks 13, 14 on, with one in the seat longitudinal direction SL to the rear slightly sloping slot 15, 16 are provided. With these slots 15, 16 is the seat support 4 on the transverse axis 9 rotatable about this axis and in Direction of the slots 15, 16 slidably. By engaging this Components is thus a rotary-sliding joint 17 between the base and seat support 1, 4 formed.
  • tension spring arrangement For acting on the synchronizing mechanism against the synchronizing movement from the basic position shown in Figs. 1 and 2 out is the already mentioned, as a whole with 10 designated tension spring arrangement provided, the four parallel to each other, on either side of the central longitudinal plane M in a common horizontal plane arranged tension springs 22.1 to 22.4 (hereinafter with the common reference numeral 22, unless a single tension spring of a separate discussion required).
  • These tension springs 22 are with their front suspension eye 23 each hooked to receiving hooks 24, which in turn on the Transverse axis 9 are pivotally hinged in the crosshead 8 of the base support 1.
  • the tension springs 22 also have hooks 25, which is rotated relative to the front hooks 23 by 90 ° lie. With these hooks 25, the tension springs 22 are again suspended in the rear receiving hooks 26, which in closer discussed below Way as a position adjustable bearing of the adjustment 12 for adjustment the bias of the tension springs 22 act.
  • the pickup hooks 26 are facing away from the hook ends 27 in this regard Articulated ends 28 hinged to eccentrics 29.
  • the joint ends 28 a bearing bush 30, in the corresponding stub axle 31 of the eccentric 29 intervene.
  • the pivoting direction of this articulated connection is vertical.
  • the four eccentrics 29 are each arranged coaxially above Gear wheels provided, wherein the so-called coupling gears 32.1, 32.4 are associated with the two outer eccentrics 29.1, 29.4.
  • These Coupling gears 32.1, 32.4 are each adjacent to an inside thereof arranged gear 33.2, 33.3 in engagement with the two inner eccentrics 29.2, 29.3 are rotationally coupled.
  • gears 33.2, 33.3 will be clockwise and counterclockwise the coupling gears 32.1, 32.4, each with opposite Driving sense driven.
  • the main drive of the eccentric 29 existing eccentric via an actuator 34, the one in the seat support 4 transverse to Seat longitudinal direction SL and horizontally extending, laterally projecting actuating shaft 35, which has a non-illustrated operating knob is rotatable by hand at the end.
  • Central points the actuating shaft 35 a threaded screw 36 which with the gears 33.2, 33.3 engages and forms a worm gear 37.
  • the screw 36 divided into two opposing threaded sections 38.2, 38.3, so that by a rotation of the actuating shaft 35 and the worm gear 37 with the threaded sections 38.2, 38.3 in engagement standing gears 33.2, 33.3 always in opposite directions of rotation Rotate D1, D2.

Abstract

Synchronizing mechanism comprises a spring arrangement (10) having an extension spring (24) arranged parallel to the sliding direction of a seat support (4) and between a bearings. Preferred Features: One or more bearings for increasing the spring length can be adjusted to adjust the pre-tension of further extension springs (22). Each adjustable bearing is formed by a receiving hook which is hinged on an cam. The cam can be rotated by an adjusting drive via a worm gear pair.

Description

Die Erfindung betrifft eine Synchronmechanik für Bürostühle mit den im Oberbegriff des Anspruchs 1 angegebenen Merkmalen, wie sie aus der DE 198 10 768 A1 oder der DE 101 25 994 A1 bekannt sind.The invention relates to a synchronous mechanism for office chairs with the im The preamble of claim 1 specified features, as described in DE 198 10 768 A1 or DE 101 25 994 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.Under the name "synchronous mechanism" assemblies are in the seat substructure of an office chair meant for a coupled, a certain relative movement of the seat and backrest to each other provide with bringing kinematics. This is on a chair column a base support placed on the one to a pivotable about a transverse axis, hingedly connected to the base support seat support and on the other also pivotable about a transverse axis, hinged to the base support connected backrest support are stored. On the seat carrier is the usually with a padded seat provided seat of the office chair assembled. The backrest support, which is commonly used by the Actual synchronous mechanism extends to the rear, contributes to one after Above extending boom, 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 for example caused by leaning on the chair user to the backrest can be - a lowering movement of the rear edge of the seat down induced. This correlated seat-back movement brings one considerable comfort advantage with it and is for orthopedic reasons he wishes.

Um bei einer reinen Schwenkkopplung des Rückenlehnenträgers mit dem Basis- und Sitzträger eine Verschwenkung von Rückenlehne und Sitz nach hinten unten zu ermöglichen, muss in die Mechanik ein Freiheitsgrad eingeführt werden, der eine Verschiebung des Sitzträgers nach hinten bei gleichzeitiger Verschwenkbarkeit um sein vorderes Ende ermöglicht. Hierfür offenbaren die beiden eingangs genannten Druckschriften zum Stand der Technik ein Dreh-Schiebe-Gelenk zwischen Basisträger und vorderem Ende des Sitzträgers. Je nachdem, ob und wie stark bei der Schiebe-Schwenk-Bewegung des Sitzträgers ein Ansteigen der Sitzvorderkante gewünscht ist, liegt die langlochartige Schiebeführung für den Sitzträger eher steil, wie bei der DE 198 10 768 A1 oder eher flach, wie bei der DE 101 25 994 A1.In order for a pure pivotal coupling of the backrest support with the Base and seat support a pivoting of the backrest and seat to at the bottom of the back, one degree of freedom must be introduced into the mechanics be, which is a displacement of the seat support to the rear simultaneous pivoting around its front end allows. Therefor disclose the two documents mentioned above to the state the technique of a rotary-sliding joint between the base plate and the front End of the seat carrier. Depending on whether and how strong in the sliding-swivel movement the seat support an increase in the seat leading edge desired is, the slot-like sliding guide for the seat support is more likely steep, as in DE 198 10 768 A1 or rather flat, as in DE 101 25th 994 A1.

Ein weiterer 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. Bei der Synchronmechanik gemäß DE 198 10 768 A1 ist die Kombination einer Gas- und Schraubendruckfeder vorgesehen, die sich als relativ hoch bauende Einheit unter den Sitzträger erstreckt. Der eine Angriffspunkt dieser Federanordnung ist das vordere Lagerende des Sitzträgers, mit seinem rückwärtigen Ende ist die Federanordnung in einem Widerlager vor der Konusaufnahme des Sitzträgers abgestützt.Another basic issue with synchronous mechanisms is in their spring action against the pivoting backwards. For this For example, a variety of spring designs are known in the art. In the synchronous mechanism according to DE 198 10 768 A1, the combination a gas and helical compression spring provided, which is considered relative high-building unit extends under the seat support. The one attack point this spring arrangement is the front bearing end of the seat support, with its rear end, the spring assembly is in an abutment supported the cone seat of the seat support.

Die bei der Konstruktion gemäß DE 101 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. The provided in the construction according to DE 101 25 994 A1 spring arrangement is based on two torsion springs, which housed in the base plate are. The one leg of the spring is in an adjustment in the base support housed, whereas the second leg upwards in the direction Seat support protrudes, which has a corresponding abutment on this Leg supports and thus against its backward Swing direction is applied.

Beide Federanordnungen nach dem Stand der Technik nehmen einen beträchtlichen Teil des zur Verfügung stehenden Bauraumes im Basisträger ein, so dass dessen freier Gestaltung relativ enge Grenzen gesetzt sind. Insbesondere werden bei Verwendung solcher bekannten Synchronmechaniken die Basisträger aus optisch-ästhetischen Gründen relativ voluminöse Verkleidungen aufweisen, um die Federanordnung und die damit verbundenen Verstellelemente weitestgehend zu verbergen.Both spring assemblies of the prior art take a considerable amount Part of the available installation space in the base carrier so that its free design is set relatively narrow limits. Especially become when using such known synchronous mechanisms the base carriers for reasons of aesthetics and aesthetics relatively bulky Have fairings to the spring assembly and the associated Hide adjusting elements as far as possible.

Zu der Problematik der Verstellbarkeit der Vorspannung der Federanordnung wird auf die DE 100 08 453 C2 verwiesen, die ein Federpaket mit zuund wegschaltbaren Federeinheiten zur Variierung der Federvorspannung und damit Gegenkraft gegen das Verschwenken offenbart. Die Federanordnung selbst ist jedoch hier zwischen dem Basisträger und einem einstückigen, kombinierten Sitz-Rückenlehnen-Träger angeordnet, der als Ganzes nach hinten schwenkbar ist. Dies stellt an sich keine Synchronmechanik dar.On the problem of adjustability of the bias of the spring assembly Reference is made to DE 100 08 453 C2, which is a spring package with zuund wegschaltbaren spring units for varying the spring preload and thus reveals counterforce against pivoting. The spring arrangement itself is here however between the base carrier and a one-piece, Combined seat-backrest support arranged as a Whole is pivoted to the rear. This does not provide a synchronous mechanism per se represents.

Der Erfindung liegt die Aufgabe zugrunde, eine Synchronmechanik für Bürostühle so zu verbessern, dass die Federanordnungen bei konstruktiver Einfachheit besonders kompakt und insbesondere in engerer räumlicher Nähe unter dem Sitzträger anzuordnen ist, so dass der Bereich des Basisträgers unter Erzielung größtmöglicher Designfreiheit im wesentlichen frei bleibt.The invention is based on the object, a synchronous mechanism for Office chairs to improve so that the spring arrangements in a constructive Simplicity particularly compact and especially in a narrower spatial To arrange proximity under the seat carrier, so that the area of the base carrier essentially free, while achieving the greatest possible freedom of design remains.

Diese Aufgabe wird durch die im Kennzeichnungsteil des Anspruches 1 angegebenen Merkmale gelöst, wonach die Federanordnung mindestens eine im wesentlichen parallel zur Schieberichtung des Sitzträgers flach unter dessen Oberseite angeordnete Zugfeder aufweist, die zwischen einem basisträgerfesten Lager und einem rückenlehnenträgerfesten oder vorzugsweise sitzträgerfesten Lager angeordnet ist.This object is achieved by the in the characterizing part of claim 1 given characteristics, according to which the spring arrangement at least a substantially parallel to the sliding direction of the seat support flat below whose upper side has arranged tension spring, which between a base carrier fixed bearing and a backrest carrier fixed or preferably seat carrier fixed bearing is arranged.

Durch die angegebene Konstruktionsweise ist die gesamte Federanordnung zum einen konstruktiv wenig aufwendig, da zum einen mit einfach aufgebauten und mit geringen konstruktiven Mitteln an die Elemente der Synchronmechanik anbindbaren Zugfedern gearbeitet wird. Diese brauchen beispielsweise nur zwischen zwei entsprechende hakenförmige Lager am Basisträger bzw. Rücklehnen- oder Sitzträger eingehängt zu werden. Ferner ist durch die Anordnung flach unter der Oberseite des Sitzträgers eine besonders raumsparende und kompakte Ausführung der Federanordnung gewährleistet. Der Begriff "unter dessen Oberseite" soll dabei so verstanden werden, dass die Zugfedern entweder unter einer durch die Deckfläche des Sitzträgers gebildeten Abdeckung, aber auch in einer nach oben offenen Aufnahme des in aller Regel aus einem Spritzgussteil komplex aufgebauten und mit einstückig angeformten Konstruktionselementen, wie beispielsweise Versteifungsrippen, Achsaufnahmen etc. versehenen Sitzträgers angeordnet sein können. Es soll lediglich darauf ankommen, dass die Zugfedern flach, parallel zur Sitzfläche innerhalb der Höhenkontur des im wesentlichen plattenförmigen Sitzträgers liegen. Damit ragt die Federanordnung praktisch horizontal nach hinten entlang des Sitzträgers und der Bereich unterhalb davon bleibt für andere Konstruktions- und Designteile des Stuhles in beliebiger Weise nutzbar.By the specified construction, the entire spring arrangement on the one hand constructively less expensive, because on the one hand with a simple design and with little constructive means to the elements of the synchronous mechanism bindable tension springs is worked. These need For example, only between two corresponding hook-shaped bearing on Base support or backrest or seat support to be hung. Further is by the arrangement flat under the top of the seat support one particularly space-saving and compact design of the spring arrangement guaranteed. The term "under the top" is intended to be understood be that the tension springs either under one through the top surface the seat support formed cover, but also in an upwardly open Inclusion of the usually made of an injection molded part complex and with integrally molded structural elements, such as Stiffening ribs, axle mountings etc. provided seat support can be arranged. It is only important that the Tension springs flat, parallel to the seat within the height contour of the im lie essentially plate-shaped seat support. This protrudes the spring assembly practically horizontally back along the seat support and the Area below it remains for other design and design parts of the chair usable in any way.

Die Grundkonstruktion der Federanordnung auf der Basis von Zugfedern ermöglicht auch bevorzugte Weiterbildungen, bei denen die Verstellung der Vorspannung der Federanordnung auf einfache Weise bewerkstelligbar ist. Diese sind in den Unteransprüchen angegeben und in einem Ausführungsbeispiel anhand der beigefügten Zeichnungen näher erläutert. Es zeigen:

Fig. 1
eine Seitenansicht einer Synchronmechanik,
Fig. 2
deren Unteransicht und
Fig. 3
deren Rückansicht.
The basic construction of the spring arrangement on the basis of tension springs also allows preferred developments in which the adjustment of the bias of the spring assembly can be accomplished in a simple manner. These are specified in the subclaims and explained in more detail in an embodiment with reference to the accompanying drawings. Show it:
Fig. 1
a side view of a synchronous mechanism,
Fig. 2
their bottom view and
Fig. 3
their rear view.

Im Folgenden soll zuerst der Grundaufbau der Synchronmechanik erläutert werden. So ist als tragendes Teil ein Basisträger 1 vorgesehen, der im Bereich seines hinteren Endes mit einer Konusaufnahme 2 zum Aufstecken der Synchronmechanik auf das obere Ende einer (nicht gezeigten) Stuhlsäule versehen ist. Weitere Grundbauteile der Synchronmechanik sind der Rückenlehnenträger 3 und der Sitzträger 4. Der Rückenlehnenträger 3 ist kurz vor der Konusaufnahme 2 über eine Querachse 5 schwenkbar am Basisträger 1 gelagert. Er weist zwei in einem Bogen nach hinten oben verlaufende Seitenstreben 6, 7 auf, an denen die nicht gezeigte Rückenlehne angebracht ist.The basic structure of the synchronous mechanism will first be explained below become. Thus, as a supporting part, a base support 1 is provided which is in the area its rear end with a cone holder 2 for attaching the synchronous mechanism on the upper end of a (not shown) chair column is provided. Other basic components of the synchronous mechanism are the Backrest support 3 and the seat support 4. The backrest support 3 is shortly before the cone seat 2 via a transverse axis 5 pivotally on the base support 1 stored. He has two in a curve back upwards running Side struts 6, 7 on which the backrest, not shown attached is.

Der Basisträger 1 nimmt in seiner Seitenansicht (Fig. 1) die Bogenform des Rückenlehnenträgers 3 auf und führt nach vorne oben, wo in seinem vorderen Endbereich ein Querhaupt 8 einstückig angeformt ist. Dieses trägt eine Querachse 9, die mehrere Funktionen erfüllt, nämlich zum einen die Dreh-Schiebe-Lagerung des Sitzträgers 4 und zum anderen als Widerlager für die noch näher zu erläuternde Zugfederanordnung 10 mit Verstellanordnung 12.The base support 1 takes in its side view (FIG. 1) the arch shape of the Backrest support 3 on and leads to the front above, where in his front End a crosshead 8 is integrally formed. This one is wearing Transverse axis 9, which fulfills several functions, namely on the one hand, the rotary-sliding storage the seat support 4 and the other as an abutment for to be explained in more detail tension spring assembly 10 with adjustment 12th

Hinsichtlich der Dreh-Schiebe-Lagerung des Sitzträgers 4 weist dieser im Bereich seines vorderen Endes zwei nach unten abstehende, seitliche Wangen 13, 14 auf, die mit einem in Sitzlängsrichtung SL nach hinten leicht abfallenden Langloch 15, 16 versehen sind. Mit diesen Langlöchern 15, 16 ist der Sitzträger 4 auf der Querachse 9 um diese Achse drehbar und in Richtung der Langlöcher 15, 16 verschiebbar. Durch den Eingriff dieser Bauteile wird also ein Dreh-Schiebe-Gelenk 17 zwischen Basis- und Sitzträger 1, 4 gebildet.With regard to the pivot-sliding support of the seat support 4, this has in The area of its front end has two downwardly projecting, lateral cheeks 13, 14 on, with one in the seat longitudinal direction SL to the rear slightly sloping slot 15, 16 are provided. With these slots 15, 16 is the seat support 4 on the transverse axis 9 rotatable about this axis and in Direction of the slots 15, 16 slidably. By engaging this Components is thus a rotary-sliding joint 17 between the base and seat support 1, 4 formed.

Im Bereich seines rückwärtigen Endes ist der Sitzträger 4 an seinen seitlichen Wangen 13, 14 mit nach innen abstehenden Achsstummeln 18, 19 versehen, die von außen in nach oben abstehende Lagerfortsätze 20, 21 am Rückenlehnenträger 3 eingreifen. Damit sind Rückenlehnenträger 3 und Sitzträger 4 gelenkig um eine horizontale Querachse verschwenkbar miteinander verbunden.In the region of its rear end of the seat support 4 is at its side Cheeks 13, 14 with inwardly projecting axle stubs 18, 19 provided, from the outside in upwardly projecting bearing extensions 20, 21 am Backrest support 3 intervene. So are backrest support 3 and Seat support 4 pivotally about a horizontal transverse axis pivotable with each other connected.

Zur Beaufschlagung der Synchronmechanik entgegen der Synchronverstellbewegung aus der in den Fig. 1 und 2 gezeigten Grundposition heraus ist die bereits angesprochene, als Ganzes mit 10 bezeichnete Zugfederanordnung vorgesehen, die vier parallel zueinander, beiderseits der Mittellängsebene M in einer gemeinsamen horizontalen Ebene angeordnete Zugfedern 22.1 bis 22.4 (im Folgenden mit dem gemeinsamen Bezugszeichen 22 versehen, sofern nicht eine einzelne Zugfeder einer gesonderten Erörterung bedarf) aufweist. Diese Zugfedern 22 sind mit ihrer vorderen Einhängeöse 23 jeweils an Aufnahmehaken 24 eingehängt, die wiederum auf der Querachse 9 im Querhaupt 8 des Basisträgers 1 schwenkbar angelenkt sind.For acting on the synchronizing mechanism against the synchronizing movement from the basic position shown in Figs. 1 and 2 out is the already mentioned, as a whole with 10 designated tension spring arrangement provided, the four parallel to each other, on either side of the central longitudinal plane M in a common horizontal plane arranged tension springs 22.1 to 22.4 (hereinafter with the common reference numeral 22, unless a single tension spring of a separate discussion required). These tension springs 22 are with their front suspension eye 23 each hooked to receiving hooks 24, which in turn on the Transverse axis 9 are pivotally hinged in the crosshead 8 of the base support 1.

An ihren rückwärtigen Enden weisen die Zugfedern 22 ebenfalls Einhängeösen 25 auf, die gegenüber den vorderen Einhängeösen 23 um 90° verdreht liegen. Mit diesen Einhängeösen 25 sind die Zugfedern 22 wiederum in hinteren Aufnahmehaken 26 eingehängt, die in im Folgenden näher erörterter Weise als lageverstellbares Lager der Verstellanordnung 12 zur Verstellung der Vorspannung der Zugfedern 22 fungieren. Die Aufnahmehaken 26 sind in dieser Hinsicht mit ihren den Hakenenden 27 abgewandten Gelenkenden 28 an Exzentern 29 angelenkt. Dazu weisen die Gelenkenden 28 eine Lagerbuchse 30 auf, in die entsprechende Achsstummel 31 der Exzenter 29 eingreifen. Die Schwenkrichtung dieser Gelenkverbindung liegt vertikal. Die vier Exzenter 29 sind jeweils mit koaxial darüber angeordneten Zahnrädern versehen, wobei die so bezeichneten Kopplungszahnräder 32.1, 32.4 den beiden äußeren Exzentern 29.1, 29.4 zugeordnet sind. Diese Kopplungszahnräder 32.1, 32.4 stehen mit jeweils einem innen davon benachbart angeordneten Zahnrad 33.2, 33.3 in Eingriff, die mit den beiden inneren Exzentern 29.2, 29.3 drehgekoppelt sind. Durch eine Drehung der Zahnräder 33.2, 33.3 beispielsweise im und gegen den Uhrzeigersinn werden die Kopplungszahnräder 32.1, 32.4 mit jeweils entgegengesetztem Drehsinn angetrieben.At their rear ends, the tension springs 22 also have hooks 25, which is rotated relative to the front hooks 23 by 90 ° lie. With these hooks 25, the tension springs 22 are again suspended in the rear receiving hooks 26, which in closer discussed below Way as a position adjustable bearing of the adjustment 12 for adjustment the bias of the tension springs 22 act. The pickup hooks 26 are facing away from the hook ends 27 in this regard Articulated ends 28 hinged to eccentrics 29. For this purpose, the joint ends 28 a bearing bush 30, in the corresponding stub axle 31 of the eccentric 29 intervene. The pivoting direction of this articulated connection is vertical. The four eccentrics 29 are each arranged coaxially above Gear wheels provided, wherein the so-called coupling gears 32.1, 32.4 are associated with the two outer eccentrics 29.1, 29.4. These Coupling gears 32.1, 32.4 are each adjacent to an inside thereof arranged gear 33.2, 33.3 in engagement with the two inner eccentrics 29.2, 29.3 are rotationally coupled. By turning the For example, gears 33.2, 33.3 will be clockwise and counterclockwise the coupling gears 32.1, 32.4, each with opposite Driving sense driven.

Der Hauptantrieb der aus den Exzentern 29 bestehenden Exzenteranordnung erfolgt über einen Stellantrieb 34, der eine im Sitzträger 4 quer zur Sitzlängsrichtung SL und horizontal verlaufende, seitlich abstehende Betätigungswelle 35 aufweist, die über einen nicht näher dargestellten Betätigungsknauf am Ende von Hand drehbar ist. Zentral weist die Betätigungswelle 35 eine Gewindeschnecke 36 auf, die mit den Zahnrädern 33.2, 33.3 in Eingriff steht und ein Schneckenradgetriebe 37 bildet. Dabei ist die Gewindeschnecke 36 in zwei gegenläufige Gewindeabschnitte 38.2, 38.3 geteilt, so dass durch eine Drehung der Betätigungswelle 35 und des Schneckenradgetriebes 37 die mit den Gewindeabschnitten 38.2, 38.3 in Eingriff stehenden Zahnräder 33.2, 33.3 immer in gegenläufigen Drehrichtungen D1, D2 rotieren. The main drive of the eccentric 29 existing eccentric via an actuator 34, the one in the seat support 4 transverse to Seat longitudinal direction SL and horizontally extending, laterally projecting actuating shaft 35, which has a non-illustrated operating knob is rotatable by hand at the end. Central points the actuating shaft 35 a threaded screw 36 which with the gears 33.2, 33.3 engages and forms a worm gear 37. Here is the screw 36 divided into two opposing threaded sections 38.2, 38.3, so that by a rotation of the actuating shaft 35 and the worm gear 37 with the threaded sections 38.2, 38.3 in engagement standing gears 33.2, 33.3 always in opposite directions of rotation Rotate D1, D2.

Wie aus Fig. 2 erkennbar ist, ist in der dort gezeigten Grundstellung der verstellbaren Exzenteranordnung 12 die Drehposition der beiden äußeren Exzenter 29.1, 29.4 so, dass sich die Aufnahmehaken 26.1, 26.4 in ihrer vorderen Totpunktstellung befinden. Die inneren Exzenter 29.2, 29.3 sind demgegenüber in ihrer Drehstellung um 90° verdreht und stehen damit so, dass die zugeordneten Aufnahmehaken 26.2, 26.3 maximal weit nach innen verlagert sind. In dieser Stellung ist die Zugfederanordnung 10 am wenigstens vorgespannt, erzeugt also den geringsten Widerstand gegen eine Schwenkbewegung von Rücklehnenträger 3 und Sitzträger 4 nach hinten unten. Bei dieser Bewegung, bei der der Sitzträger 4 im Dreh-Schiebe-Gelenk 17 entlang gleitet, wird der Abstand zwischen den vorderen Aufnahmehaken 24 und den hinteren Aufnahmehaken 26 vergrößert, so dass sich die Zugfedern 22 unter Aufbau einer entsprechenden Gegenkraft dehnen. Bei dieser Einstellung der Exzenter 29 werden ferner, da sich die äußeren Federn 22.1, 22.4 im vorderen Totpunkt befinden, keine signifikanten Kräfte über die inneren Zahnräder 33.2, 33.3 auf den Stellantrieb 34 übertragen. Ferner heben sich durch die gegenläufigen Gewindeabschnitte 38.2, 38.3 der Gewindeschnecke 36 die Axialkräfte in dieser gegenseitig auf, die durch die inneren Zahnräder 33.2, 33.3 auf die Schnecke bedingt durch die Zugkräfte der Federn 22 einwirken. Insgesamt werden also keine signifikanten Kräfte durch Rückwirkung der Federn 22 auf die Betätigungswelle 35 übertragen, so dass eine leichtgängige Betätigung gewährleistet ist.As can be seen from Fig. 2, in the basic position shown there is the adjustable eccentric 12, the rotational position of the two outer Eccentric 29.1, 29.4 so that the receiving hooks 26.1, 26.4 in their front dead center position are located. The inner eccentric 29.2, 29.3 are in contrast rotated in its rotational position by 90 ° and are so, that the associated receiving hooks 26.2, 26.3 maximum far inward are relocated. In this position, the tension spring assembly 10 is at least biased, thus producing the least resistance to a Pivoting movement of backrest support 3 and seat support 4 to the rear below. In this movement, in which the seat support 4 in the rotary sliding joint 17 slides along, the distance between the front pickup hook 24 and the rear receiving hook 26 increases, so that the tension springs 22 stretch under construction of a corresponding counterforce. In this setting, the eccentric 29 are further, since the outer Springs 22.1, 22.4 are at the front dead center, no significant Forces on the inner gears 33.2, 33.3 on the actuator 34th transfer. Furthermore, they are lifted by the opposite threaded sections 38.2, 38.3 of the screw 36, the axial forces in this mutually on, due to the internal gears 33.2, 33.3 on the screw act by the tensile forces of the springs 22. Overall, so no significant forces by reaction of the springs 22 on the actuating shaft 35 transmitted, so that ensures a smooth operation is.

Durch ein Drehen an der Betätigungswelle 35 rotiert die Gewindeschnecke 36 so, dass sich die inneren Zahnräder 33.2, 33.3 in den erwähnten gegenläufigen Drehrichtungen D1, D2 und dadurch wiederum die äußeren Kopplungszahnräder 32.1, 32.4 in gegenläufige Richtungen D3, D4 drehen. Dadurch werden die inneren Aufnahmehaken 26.2, 26.3 in die hintere Totpunktstellung verbracht, während die äußeren Aufnahmehaken 26.1, 26.4 aus der gezeigten vorderen Totpunktstellung in die um 90° nach außen verdrehte Stellung fahren. Insgesamt werden alle vier Zugfedern 22 durch die Verlagerung der Aufnahmehaken 26 nach hinten gedehnt und damit mit einer größeren Vorspannung beaufschlagt. Bei der vorstehend erörterten härtesten Einstellung befinden sich - wie gesagt - die inneren Federn im hinteren Totpunkt, so dass ein selbstständiges Zurückdrehen des Schneckenradgetriebes 37 durch die Beaufschlagung durch die stärker gedehnten Zugfedern 22 aufgrund der Selbsthemmung im Schneckenradgetriebe 37 unterbunden wird.By rotating the actuating shaft 35, the screw screw rotates 36 so that the inner gears 33.2, 33.3 in the mentioned opposite Direction of rotation D1, D2 and in turn the outer coupling gears 32.1, 32.4 rotate in opposite directions D3, D4. Thereby the inner receiving hooks 26.2, 26.3 are in the rear dead center position spent while the outer receiving hooks 26.1, 26.4 from the front dead center position shown in the rotated by 90 ° outwards Drive position. Overall, all four springs 22 through the Displacement of the receiving hook 26 stretched backwards and thus with a larger bias applied. In the above discussed hardest setting are - as I said - the inner springs in the rear dead center, allowing an independent turning back of the worm gear 37 by the impact of the more stretched Tension springs 22 due to the self-locking in the worm gear 37th is prevented.

Claims (10)

Synchronmechanik für Bürostühle umfassend einen auf einer Stuhlsäule platzierbaren Basisträger (1), einen um eine Querachse (5) schwenkbar am Basisträger (1) angelenkten Rückenlehnenträger (3), einen Sitzträger (4), der im Bereich seines vorderen Endes über ein Dreh-Schiebe-Gelenk (17) um eine Querachse (11) schwenkbar und im wesentlichen in Sitzlängsrichtung (SL) verschiebbar mit dem Basisträger (1) und im Bereich seines rückwärtigen Endes um eine Querachse (18, 19) schwenkbar mit dem Rückenlehnenträger (4) gekoppelt ist, sowie eine Federanordnung (10) zur Beaufschlagung der Synchronmechanik entgegen deren Synchron-Verstellbewegung von Sitz- (4) und Rückenlehnenträger (3), dadurch gekennzeichnet, dass die Federanordnung (10) mindestens eine im wesentlichen parallel zur Schieberichtung des Sitzträgers (4) flach unter dessen Oberseite angeordnete Zugfeder (24) aufweist, die zwischen einem basisträgerfesten Lager (24) und einem rückenlehnenträgerfesten oder vorzugsweise sitzträgerfesten Lager (26) angeordnet ist. Comprising synchronous mechanism for office chairs a base support (1) which can be placed on a chair column, a backrest support (3) pivotable about a transverse axis (5) and pivotable on the base support (1), a seat support (4) which in the region of its front end via a rotary-sliding joint (17) about a transverse axis (11) pivotally and substantially in the seat longitudinal direction (SL) displaceable with the base support (1) and in the region of its rear end about a transverse axis (18, 19) pivotally coupled to the backrest support (4), as well as a spring arrangement (10) for acting on the synchronizing mechanism against its synchronous adjusting movement of seat (4) and backrest support (3), characterized in that the spring arrangement (10) has at least one tension spring (24) which is arranged substantially parallel to the sliding direction of the seat support (4) flatly underneath its upper side and which is arranged between a bearing (24) fixed in the base carrier and a bearing (26) fixed to the backrest carrier or preferably seat carrier. Synchronmechanik nach Anspruch 1, dadurch gekennzeichnet, dass Zugfedern (22) in einer geraden Anzahl, vorzugsweise vier Zugfedern (22.1-22.4) paarweise und symmetrisch zur Mittellängsebene (M) der Synchronmechanik zwischen Basisträger (1) und Rückenlehnenträger (3) oder vorzugsweise Sitzträger (4) angeordnet sind. Synchronous mechanism according to claim 1, characterized in that tension springs (22) in an even number, preferably four tension springs (22.1-22.4) in pairs and symmetrically to the central longitudinal plane (M) of the synchronous mechanism between the base support (1) and backrest support (3) or preferably seat support ( 4) are arranged. Synchronmechanik nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass zur Verstellung der Vorspannung der mindestens einen Zugfeder (22) mindestens eines der beiden Lager (26) zur Erhöhung der Federlänge lageverstellbar ist.Synchronous mechanism according to claim 1 or 2, characterized in that for adjusting the bias of the at least one tension spring (22) at least one of the two bearings (26) to increase the spring length is adjustable in position. Synchronmechanik nach Anspruch 3, dadurch gekennzeichnet, dass jedes verstellbare Lager durch einen Aufnahmehaken (26) gebildet ist, der an einem verdrehbaren Exzenter (29) angelenkt ist.Synchronous mechanism according to claim 3, characterized in that each adjustable bearing is formed by a receiving hook (26) which is articulated on a rotatable eccentric (29). Synchronmechanik nach Anspruch 2 und 5, dadurch gekennzeichnet, dass der mindestens eine Exzenter (29) durch einen Stellantrieb (34) über ein Schneckenradgetriebe (37) verdrehbar ist.Synchronous mechanism according to claim 2 and 5, characterized in that the at least one eccentric (29) by an actuator (34) via a worm gear (37) is rotatable. Synchronmechanik nach Anspruch 5, dadurch gekennzeichnet, dass das Schneckenradgetriebe (37) zwei symmetrisch zur Mittellängsebene (M) angeordnete Exzenteranordnungen (29.1, 29.2 und 29.3, 29.4) für zwei symmetrische Zugfederanordnungen (22.1, 22.2 und 22.3, 22.4) über gegenläufige Gewindeschneckenabschnitte (32.2, 38.3) antreibt.Synchronous mechanism according to claim 5, characterized in that the worm gear (37) two symmetrically to the central longitudinal plane (M) arranged eccentric assemblies (29.1, 29.2 and 29.3, 29.4) for two symmetrical Zugfederanordnungen (22.1, 22.2 and 22.3, 22.4) on opposite threaded screw sections (32.2 , 38.3). Synchronmechanik nach Anspruch 6, dadurch gekennzeichnet, dass jede Exzenteranordnung zwei seitlich nebeneinander angeordnete Exzenter (29) mit jeweils einem Aufnahmehaken (26) und einer Zugfeder (22) aufweist, wobei jeweils die inneren Exzenter (29.2, 29.3) über das in die Gewindeschnecke (36) eingreifende Zahnrad (33.2, 33.3) des Schneckenradgetriebes (37) und die äußeren Exzenter (29.1, 29.4) jeweils über ein mit diesem Zahnrad (33.2, 33.3) eingreifendes Kopplungszahnrad (32.1, 32.4) angetrieben sind. Synchronous mechanism according to claim 6, characterized in that each eccentric arrangement has two laterally juxtaposed eccentrics (29) each with a receiving hook (26) and a tension spring (22), wherein in each case the inner eccentric (29.2, 29.3) via the in the screw ( 36) engaging gear (33.2, 33.3) of the worm gear (37) and the outer eccentric (29.1, 29.4) in each case via a with this gear (33.2, 33.3) engaging the coupling gear (32.1, 32.4) are driven. Synchronmechanik nach Anspruch 7, dadurch gekennzeichnet, dass die beiden Aufnahmehaken (26.1, 26.2 und 26.3, 26.4) in Winkelpositionen an ihren Exzentern (29) angelenkt sind, die um 90° zueinander versetzt sind.Synchronous mechanism according to claim 7, characterized in that the two receiving hooks (26.1, 26.2 and 26.3, 26.4) are articulated in angular positions on their eccentrics (29), which are offset by 90 ° to each other. Synchronmechanik nach einem der Ansprüche 3 bis 8, dadurch gekennzeichnet, dass die verstellbaren Lager (26) der Zugfedern (22) am hinteren Ende des Sitzträgers (4) angeordnet sind.Synchronous mechanism according to one of claims 3 to 8, characterized in that the adjustable bearings (26) of the tension springs (22) at the rear end of the seat support (4) are arranged. Synchronmechanik nach einem der Ansprüche 3 bis 9, dadurch gekennzeichnet, dass die nicht verstellbaren Lager der Zugfedern (22) durch am Basisträger (1) angelenkte Aufnahmehaken (24) im Vorderbereich des Sitzträgers (4) gebildet sind.Synchronous mechanism according to one of claims 3 to 9, characterized in that the non-adjustable bearings of the tension springs (22) are hinged to the base support (1) receiving hooks (24) in the front region of the seat support (4).
EP04025029A 2003-12-06 2004-10-21 Synchronised mechanism for an office chair Not-in-force EP1537804B1 (en)

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WO2010028412A1 (en) * 2008-09-15 2010-03-18 Bene Ag Device for adjusting the pivoting resistance of a backrest
EP2926690A1 (en) * 2014-04-04 2015-10-07 Bock 1 GmbH & Co. KG Mechanism for an office chair
CN112384106A (en) * 2018-07-02 2021-02-19 柯尼希及诺伊拉特股份公司 Chair (Ref. TM. chair)

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CN105361484B (en) * 2015-12-01 2017-11-24 中原工学院 A kind of timing adjustable seating
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CN112384106A (en) * 2018-07-02 2021-02-19 柯尼希及诺伊拉特股份公司 Chair (Ref. TM. chair)

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DK1537804T3 (en) 2007-06-25
DE502004003024D1 (en) 2007-04-12
CN100569144C (en) 2009-12-16
DE10357165A1 (en) 2005-06-30
EP1537804B1 (en) 2007-02-28
ATE354992T1 (en) 2006-03-15

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