EP0645974A1 - Chair. - Google Patents

Chair.

Info

Publication number
EP0645974A1
EP0645974A1 EP94913565A EP94913565A EP0645974A1 EP 0645974 A1 EP0645974 A1 EP 0645974A1 EP 94913565 A EP94913565 A EP 94913565A EP 94913565 A EP94913565 A EP 94913565A EP 0645974 A1 EP0645974 A1 EP 0645974A1
Authority
EP
European Patent Office
Prior art keywords
seat
bearing block
backrest
pivot
pivoting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP94913565A
Other languages
German (de)
French (fr)
Other versions
EP0645974B1 (en
Inventor
Klaus Schrewe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mauser Office GmbH
Original Assignee
Mauser Waldeck AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mauser Waldeck AG filed Critical Mauser Waldeck AG
Publication of EP0645974A1 publication Critical patent/EP0645974A1/en
Application granted granted Critical
Publication of EP0645974B1 publication Critical patent/EP0645974B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C31/00—Details or accessories for chairs, beds, or the like, not provided for in other groups of this subclass, e.g. upholstery fasteners, mattress protectors, stretching devices for mattress nets
    • A47C31/12—Means, e.g. measuring means for adapting chairs, beds or mattresses to the shape or weight of persons
    • A47C31/126—Means, e.g. measuring means for adapting chairs, beds or mattresses to the shape or weight of persons for 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
    • A47C1/03255—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest with a central column, e.g. rocking office chairs
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C1/00—Chairs adapted for special purposes
    • A47C1/02—Reclining or easy chairs
    • A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03261—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means
    • A47C1/03266—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with adjustable elasticity
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C1/00—Chairs adapted for special purposes
    • A47C1/02—Reclining or easy chairs
    • A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03261—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means
    • A47C1/03272—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with coil springs

Definitions

  • the invention relates to a piece of seating furniture with a seat which can be pivoted in the front region about a horizontal pivot axis, the inclination of which can be changed and which, depending on the change in inclination of the seat, inevitably can be changed in the inclination disproportionately, the seat being pivotally connected to pivot levers, the one end supports the backrest and the other ends are rotatably mounted on the bracket of the chair frame, the pivot levers being articulated at a distance from the rear end of the seat on the seat and the sections of the pivot lever on the pedestal rotatably mounted on the pivot axis of the Sections of the swivel levers adjoining the seat are at an obtuse angle to the standing surface, a return spring being provided for automatically resetting the seat surface and the backrest from the rest position into the working position with weight relief.
  • Seating furniture of this type in particular office swivel chairs or other types of work chairs, are known in a wide variety of designs, each of which is aimed at synchronous movement of the seat surface and the backrest when pivoting from the working position with approximately horizontal seat surface and vertical backrest into the rest position to achieve what appropriate synchronization devices, for example in the form of pivoting levers, are used.
  • the synchronization device is designed such that a disproportionate pivoting of the backrest takes place when the seat surface is pivoted in order to achieve an ergonomically advantageous rest position and to avoid the so-called "shirt pull-out effect".
  • a generic seating furniture is known from DE 39 16 474-Al.
  • the pivoting from the working position into the rest position takes place by shifting the weight of the user against a restoring device which is formed, for example, by a spring.
  • a restoring device which is formed, for example, by a spring.
  • the swivel axis of the seat on the bearing block is simultaneously sloping backwards, for which purpose elongated hole guides are provided in the bearing block.
  • a disadvantage of this known seating furniture is, on the one hand, that the displaceability of the pivot axis of the seat in the front chair area requires a relatively complex structural design, which must be provided with a correspondingly space-consuming cladding, which impairs the visual impression of the seating furniture.
  • the reset device cannot be adapted to different user weights.
  • This variation of the spring preload can indeed achieve an adjustment of the resetting device, but it has been found that when the spring preload is changed, only an insufficient adjustment range in the limit ranges (for users with a low or large body weight) is achieved. In addition, either a very long adjustment path or considerable effort is required in the border areas, which makes handling more difficult.
  • the displaceability of the pivoting levers required for the synchronous movement does not require any additional installation space in the front seating area, but rather only underneath in the actual bearing block, so that overall only a small installation space is required for the synchronization technology which has a positive effect on the visual appearance.
  • the arrangement of the return spring enables the pivot lever to change the installation position of the spring, so that the power lever arm of the spring changes with respect to the pivot point of the pivot axes or Can change pivot lever, whereby the torque exerted on the pivot axes can be changed in a simple manner. There is therefore no need to change the pretension of the spring.
  • This change in position of the spring or the spring end can be carried out in a simple manner without great effort, in particular there is an extraordinarily wide range of user weight settings, which is continuously selected between the extreme values. Since the pretension of the spring is not influenced, an adjustment in the border areas is also possible in a simple and exact way.
  • the return spring is articulated at one end to the bearing block and the other end is arranged so as to be adjustable in a slot-shaped guide of the swivel lever.
  • the provision of the pivot levers is limited by means of a limiting device such that the pivot levers cannot come into contact with the underside of the seat.
  • a limiting device such that the pivot levers cannot come into contact with the underside of the seat.
  • the limiting device is formed by an elongated hole guide arranged on the underside of the swivel bearing, into which a pin-shaped element arranged on the bearing block engages. Due to its limited displaceability compared to the pin-shaped element, the elongated hole guide thus limits the maximum pivoting movement of the pivot levers, which is caused by the restoring force, in such a way that the pivot levers do not hit the underside of the seat in the rest position.
  • FIG. 1 is a schematic side view of a piece of seating furniture according to the invention in the working and rest position with a fully effective resetting device
  • a piece of seating furniture according to the invention preferably designed as a swivel chair, is generally designated 1 in the drawing and is shown without a base frame.
  • the swivel chair 1 has a bearing block 2 serving as a carrier with a receptacle 3 for the foot frame (not shown). At the front upper end of the bearing block 2, a fixed pivot point 4 is provided, around which a horizontal tale pivot axis 5 of the front region of a seat 6 with a seat 7 is articulated.
  • pivot levers 10 are articulated in a pivot lever linkage 8 about a pivot axis 9, which have a front section 10a, a middle section 10b and a rear section 10c, where in which the rear section 10c is angled approximately at right angles to the central section 10b and carries a backrest 11.
  • the front section 10a and the middle section 10b of the swivel levers 10 are at an obtuse angle to the standing surface, preferably in the order of 160 ° to 170 °.
  • the front sections 10a of the pivot levers 10 are articulated (joint 12) each connected to a lever 13 which is rotatably mounted on the bearing block 2 in a fixed pivot point 14.
  • a return spring 15 is provided.
  • This return spring is fixed at one end but rotatable (articulation 16) to the bearing block 2 and at the other end to the sections 10a of the pivot lever 10, the installation position at the sections 10a of the pivot lever 10 being changeable.
  • a curved slot guide 17 is recessed in the swivel levers 10 in the area of the sections 10a.
  • the spring in the elongated hole guide can thus be adjusted from position A to position B at the maximum.
  • a maximum restoring force acts in position A
  • the restoring force in position B or the corresponding torque is at the wrestle.
  • This adjustment of the lever arm or the torque exerted by the restoring spring enables a significantly better and more precise adjustability of the required restoring force compared to conventional bias changes of the restoring springs, in particular also in the limit areas, ie for users with a particularly high or low body weight.
  • FIG. 3 shows a modified embodiment of seating furniture 1 according to the invention, the same reference numerals as in FIGS. 1 and 2 being used if the same parts are concerned.
  • the pivot levers 10 are not mounted on the bearing block via additional levers 13, but directly in the bearing block 2, an elongated hole guide 18 being provided in the bearing block 2 to enable the pivoting lever 10 to be displaced. Otherwise, the movement sequence of the synchronous mechanism is the same as in the embodiment according to FIGS. 1 and 2, but this embodiment according to FIG. 3 obviously requires even fewer components and is therefore even more advantageous.
  • FIG. 4 The embodiment of a piece of seating furniture 1 according to the invention shown in FIG. 4, the same reference numerals are used here as in the previous figures. corresponds in principle to the embodiment according to FIG. 1.
  • a limitation device is also provided in this seating furniture 1, which limits the return of the pivoting levers 10 in such a way that the pivoting levers 10 cannot come into contact with the underside of the seat 2.
  • the limiting device has a bow-shaped elongated hole guide 20 arranged on the underside of the pivot lever linkage 8, which cooperates with a pin-shaped element 19 arranged on the bearing block 3 and is guided so as to be displaceable to a limited extent.
  • the slot guide 20 is designed such that a free space remains at the stop of the slot guide 20 on the pin-shaped element 19 between the pivot levers 10 or the regions 10b of the pivot lever and the underside of the seat 2 in the rest position.
  • FIG. 5 shows a conventional adjustment by changing the pretensioning force of the spring
  • FIG. 6 the adjustment range can be seen by changing the installation position of the spring according to the invention.
  • the adjustment range is at the embodiment according to the invention (FIG. 6) is considerably larger, which considerably simplifies the adjustment, particularly in the border areas.

Landscapes

  • Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Chairs For Special Purposes, Such As Reclining Chairs (AREA)
  • Chairs Characterized By Structure (AREA)
  • Chair Legs, Seat Parts, And Backrests (AREA)
  • Seats For Vehicles (AREA)
  • Mattresses And Other Support Structures For Chairs And Beds (AREA)
  • Special Chairs (AREA)
  • Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
  • Finger-Pressure Massage (AREA)

Abstract

PCT No. PCT/EP94/01105 Sec. 371 Date Dec. 12, 1994 Sec. 102(e) Date Dec. 12, 1994 PCT Filed Apr. 9, 1994 PCT Pub. No. WO94/23614 PCT Pub. Date Oct. 27, 1994The invention is directed to a seat arrangement with a seat pivotable around a horizontal pivot axis in its front region and with a variable inclination and with a backrest whose inclination can be changed compulsorily more than proportionally (super proportionally) in relationship to [or as a function of] the inclination change of the seat; herein the seat is pivotally connected to rocking levers. The rocking levers support the backrest with their respective ends. The respective ends of the rocking levers, opposite to the respective backrest supporting ends, are pivotally attached to the bearing block of the seat frame, wherein the rocking levers are articulated at the seat with spacing from the rear end of said seat and where the segments of the rocking levers rotatably supported in the bearing block and the segments of the rocking levers adjacent to the articulation axis of the seats form an obtuse angle with the base, wherein a return spring is provided for automatic return of the seat surface and backrest from the neutral into the working position if the weight is removed from the seat.

Description

"Sitzmöbel ""Seating furniture"
Die Erfindung betrifft ein Sitzmöbel mit einem im vorderen Bereich um eine horizontale Schwenkachse schwenkbaren, in der Neigung veränderbaren Sitz und einer in Abhängigkeit von der Neigungsänderung des Sitzes zwangsweise in der Nei¬ gung überproportional veränderbaren Rückenlehne, wobei der Sitz mit Schwenkhebeln gelenkig verbunden ist, deren eine Enden die Rückenlehne tragen und deren andere Enden am La¬ gerbock des Stuhlgestells drehbar gelagert sind, wobei die Schwenkhebel im Abstand vom hinteren Ende des Sitzes am Sitz angelenkt sind und die am Lagerbock drehbar gelagerten .Abschnitte der Schwenkhebel zu den sich an die Anlenkachse des Sitzes anschließenden Abschnitten der Schwenkhebel in einem zur Standfläche hin stumpfen Winkel stehen, wobei ei¬ ne Rückstellfeder zur selbsttätigen Rückstellung der Sitz¬ fläche und der Rückenlehne von der Ruhe- in die Arbeitspo¬ sition bei Gewichtsentlastung vorgesehen ist.The invention relates to a piece of seating furniture with a seat which can be pivoted in the front region about a horizontal pivot axis, the inclination of which can be changed and which, depending on the change in inclination of the seat, inevitably can be changed in the inclination disproportionately, the seat being pivotally connected to pivot levers, the one end supports the backrest and the other ends are rotatably mounted on the bracket of the chair frame, the pivot levers being articulated at a distance from the rear end of the seat on the seat and the sections of the pivot lever on the pedestal rotatably mounted on the pivot axis of the Sections of the swivel levers adjoining the seat are at an obtuse angle to the standing surface, a return spring being provided for automatically resetting the seat surface and the backrest from the rest position into the working position with weight relief.
Derartige Sitzmöbel, insbesondere Bürodrehstühle oder Ar¬ beitsstühle anderer Art, sind in vielfältigen Ausführungs¬ formen bekannt, wobei jeweils angestrebt wird, beim Ver¬ schwenken von der Arbeitsposition mit etwa waagerechter Sitzfläche und senkrechter Rückenlehne in die Ruheposition eine synchrone Bewegung der Sitzfläche und der Rückenlehne zu erreichen, wozu entsprechende Synchronisationseinrich¬ tungen, beispielsweise in Form von Schwenkhebeln, verwendet werden. Dabei ist die Synchronisationseinrichtung so aus¬ gebildet, daß eine überproportionale VerSchwenkung der Rückenlehne bei Verschwenkung der Sitzfläche erfolgt, um eine ergonomisch günstige Ruheposition zu erreichen und den sogenannten "Hemdauszieheffekt" zu vermeiden.Seating furniture of this type, in particular office swivel chairs or other types of work chairs, are known in a wide variety of designs, each of which is aimed at synchronous movement of the seat surface and the backrest when pivoting from the working position with approximately horizontal seat surface and vertical backrest into the rest position to achieve what appropriate synchronization devices, for example in the form of pivoting levers, are used. The synchronization device is designed such that a disproportionate pivoting of the backrest takes place when the seat surface is pivoted in order to achieve an ergonomically advantageous rest position and to avoid the so-called "shirt pull-out effect".
Ein gattungsgemäßes Sitzmöbel ist aus der DE 39 16 474-Al bekannt. Bei diesem bekannten Sitzmöbel erfolgt die Ver¬ schwenkung von der Arbeits- in die Ruheposition durch Ge¬ wichtsverlagerung des Benutzers gegen eine Rückstellein¬ richtung, die beispielsweise von einer Feder gebildet ist. Dabei wird bei der Absenkbewegung gleichzeitig die Schwenk¬ achse des Sitzes am Lagerbock nach rückwärts abfallend ge¬ führt, wozu geeignete Langlochführungen im Lagerbock vor¬ gesehen sind.A generic seating furniture is known from DE 39 16 474-Al. In this known seating furniture, the pivoting from the working position into the rest position takes place by shifting the weight of the user against a restoring device which is formed, for example, by a spring. During the lowering movement, the swivel axis of the seat on the bearing block is simultaneously sloping backwards, for which purpose elongated hole guides are provided in the bearing block.
Von Nachteil bei diesem bekannten Sitzmöbel ist zum einen, daß die Verschiebbarkeit der Schwenkachse des Sitzes im vorderen Stuhlbereich eine relativ aufwendige konstruktive Ausgestaltung benötigt, die mit einer entsprechend raum¬ aufwendigen Verkleidung versehen werden muß, was den opti¬ schen Eindruck des Sitzmöbels beeinträchtigt. Zum anderen ist von wesentlichem Nachteil, daß die Rückstelleinrichtung nicht an unterschiedliche Benutzergewichte angepaßt werden kann.A disadvantage of this known seating furniture is, on the one hand, that the displaceability of the pivot axis of the seat in the front chair area requires a relatively complex structural design, which must be provided with a correspondingly space-consuming cladding, which impairs the visual impression of the seating furniture. On the other hand, it is a major disadvantage that the reset device cannot be adapted to different user weights.
Grundsätzlich ist es beispielsweise aus der DE 39 30 983-Al bekannt, eine Rückstelleinrichtung zu verwenden, die von wenigstens einer im Verschwenkmechanismus wirksamen Schrau¬ benfeder gebildet ist. Zur Anpassung an unterschiedliche Benutzergewichte und damit zur Einstellung unterschiedli¬ cher Rückstellkräfte ist bei diesem bekannten Sitzmöbel eine Einrichtung zur Veränderung der Vorspannung vorgese¬ hen.Basically, it is known, for example from DE 39 30 983-A1, to use a reset device which is formed by at least one helical spring which is effective in the pivoting mechanism. In order to adapt to different user weights and thus to set different restoring forces, a device for changing the preload is provided in this known seating.
Durch diese Variation der Federvorspannkraft läßt sich zwar eine Einstellung der Rückstelleinrichtung erreichen, es hat sich jedoch herausgestellt, daß bei der Veränderung der Fe¬ dervorspannkraft nur ein unzureichender Verstellbereich in den Grenzbereichen (für Benutzer mit geringem oder großem Körpergewicht) erreicht wird. Zudem ist in den Grenzberei¬ chen entweder ein sehr großer Verstellweg oder ein erhebli¬ cher Kraftaufwand erforderlich, wodurch die Handhabung er¬ schwert wird.This variation of the spring preload can indeed achieve an adjustment of the resetting device, but it has been found that when the spring preload is changed, only an insufficient adjustment range in the limit ranges (for users with a low or large body weight) is achieved. In addition, either a very long adjustment path or considerable effort is required in the border areas, which makes handling more difficult.
Aufgabe der Erfindung ist es deshalb, eine Lösung zu schaf¬ fen, mit der bei möglichst einfacher konstruktiver Ausge¬ staltung und geringer Baugröße sowie optisch ansprechendem Erscheinungsbild des Sitzmöbels die Handhabbarkeit der Rückstelleinrichtung wesentlich verbessert und auf einfache Weise auch in den Grenzbereichen mit geringem Kraftaufwand eine Einstellung ermöglicht wird.It is therefore an object of the invention to provide a solution with which the ease of handling of the seating furniture is as simple as possible in terms of design and small size, as well as visually appealing appearance of the seating furniture Reset device significantly improved and a setting is made possible in a simple manner even in the border areas with little effort.
Diese Aufgabe wird mit einem Sitzmöbel der eingangs be¬ zeichneten Art erfindungsgemäß dadurch gelöst, daß die Schwenkachse der Schwenkhebel gegenüber dem Lagerbock ver¬ schiebbar ist, und daß die Rückstellfeder zwischen dem Lagerbock und den am Lagerbock drehbar gelagerten Ab¬ schnitten der Schwenkhebel angeordnet und in ihrer Einbau¬ lage gegenüber den Schwenklagern derart veränderbar ein¬ stellbar ist, daß das von der Federkraft ausgeübte Drehmo¬ ment um die Schwenkachse veränderbar ist.This object is achieved according to the invention with a piece of seating furniture of the type described at the outset in that the pivot axis of the pivoting lever can be displaced relative to the bearing block, and in that the return spring is arranged between the bearing block and the sections of the pivoting lever which are rotatably mounted on the bearing block and in its installation position relative to the swivel bearings is adjustable so that the torque exerted by the spring force can be changed about the swivel axis.
Mit der erfindungsgemäßen Ausgestaltung wird zum einen er¬ reicht, daß die für die Synchronbewegung erforderliche Ver¬ schiebbarkeit der Schwenkhebel keinen zusätzlichen Bauraum im vorderen Sitzmöbelbereich erfordert, sondern vielmehr nur unterhalb im eigentlichen Lagerbock, wodurch für die Synchronisationsmechnik insgesamt nur ein geringer Bauraum benötigt wird, was das optische Erscheinungsbild positiv beeinflußt. Zum anderen wird in Verbindung mit dieser An- lenkung der Schwenkhebel durch die Anordnung der Rückstell¬ feder ermöglicht, die Einbaulage der Feder zu verändern, so daß sich der Krafthebelarm der Feder in Bezug auf den Dreh¬ punkt der von der Feder beaufschlagten Schwenkachsen bzw. Schwenkhebel verändern läßt, wodurch entsprechend das auf die Schwenkachsen ausgeübte Drehmoment auf einfache Weise veränderbar ist. Es ist somit keine Veränderung der Vor¬ spannung der Feder erforderlich. Diese Lageänderung der Fe¬ der bzw. des Federendes läßt sich auf einfache Weise ohne großen Kraftaufwand durchführen, insbesondere bietet sich eine außergewöhnlich große Bandbreite der Benutzergewichts¬ einstellung, die stufenlos zwischen den Extremwerten ge¬ wählt wird. Da die Vorspannung der Feder nicht beeinflußt wird, ist auch eine Einstellung in den Grenzbereichen auf einfache und exakte Weise möglich.With the configuration according to the invention, on the one hand, it is achieved that the displaceability of the pivoting levers required for the synchronous movement does not require any additional installation space in the front seating area, but rather only underneath in the actual bearing block, so that overall only a small installation space is required for the synchronization technology which has a positive effect on the visual appearance. On the other hand, in connection with this articulation, the arrangement of the return spring enables the pivot lever to change the installation position of the spring, so that the power lever arm of the spring changes with respect to the pivot point of the pivot axes or Can change pivot lever, whereby the torque exerted on the pivot axes can be changed in a simple manner. There is therefore no need to change the pretension of the spring. This change in position of the spring or the spring end can be carried out in a simple manner without great effort, in particular there is an extraordinarily wide range of user weight settings, which is continuously selected between the extreme values. Since the pretension of the spring is not influenced, an adjustment in the border areas is also possible in a simple and exact way.
In vorteilhafter Ausgestaltung der Erfindung ist vorgese¬ hen, daß die Rückstellfeder mit einem Ende fest am Lager¬ bock angelenkt und mit dem anderen Ende in einer langloch- förmigen Führung der Schwenkhebel verstellbar angeordnet ist. Diese Ausgestaltung ist konstruktiv besonders günstig und kompakt, da sie keine zusätzlichen Elemente benötigt, vielmehr sind die Führungen zur Veränderung der Einbaulage der Feder unmittelbar in die Schwenkhebel integriert.In an advantageous embodiment of the invention it is provided that the return spring is articulated at one end to the bearing block and the other end is arranged so as to be adjustable in a slot-shaped guide of the swivel lever. This design is structurally particularly inexpensive and compact, since it does not require any additional elements, rather the guides for changing the installation position of the spring are integrated directly into the pivot levers.
In besonders vorteilhafter Ausgestaltung der Erfindung ist vorgesehen, daß die Rückstellung der Schwenkhebel mittels einer Begrenzungseinrichtung derart beschränkt ist, daß die Schwenkhebel nicht in Kontakt mit der Sitzunterseite gelan¬ gen können. Anders als beispielsweise bei dem aus der DE 39 16 474-Al bekannten Sitzmöbel läßt sich durch diese Zusatzeinrichtung zuverlässig vermeiden, daß bei Wirksam¬ keit der Rückstelleinrichtung die Schwenkhebel in Kontakt mit der Sitzunterseite gelangen und diese möglicherweise beschädigen können, wenn die Rückstellkraft zu groß ist.In a particularly advantageous embodiment of the invention it is provided that the provision of the pivot levers is limited by means of a limiting device such that the pivot levers cannot come into contact with the underside of the seat. Unlike, for example, the one from the Known seating furniture known from DE 39 16 474-A1 can be reliably avoided by this additional device, that when the resetting device is effective, the pivoting levers come into contact with the underside of the seat and can possibly damage it if the resetting force is too great.
Dabei ist besonders vorteilhaft vorgesehen, daß die Be¬ grenzungseinrichtung von einer an der Unterseite des Schwenklagers angeordneten Langlochführung gebildet ist, in welche ein am Lagerbock angeordnetes stiftformiges Element eingreift. Die Langlochführung beschränkt somit durch ihre begrenzte Verschiebbarkeit gegenüber dem stiftförmigen Ele¬ ment die maximale Rückschwenkbewegung der Schwenkhebel, die durch die Rückstellkraft verursacht wird, derart, daß in der Ruheposition die Schwenkhebel nicht an die Unterseite des Sitzes stoßen.It is particularly advantageously provided that the limiting device is formed by an elongated hole guide arranged on the underside of the swivel bearing, into which a pin-shaped element arranged on the bearing block engages. Due to its limited displaceability compared to the pin-shaped element, the elongated hole guide thus limits the maximum pivoting movement of the pivot levers, which is caused by the restoring force, in such a way that the pivot levers do not hit the underside of the seat in the rest position.
Die Erfindung ist nachstehend anhand der Zeichnung bei¬ spielsweise näher erläutert. Diese zeigt in:The invention is explained in more detail below with reference to the drawing, for example. This shows in:
Fig. 1 in schematischer Seitenansicht ein erfindungsge¬ mäßes Sitzmöbel in Arbeits- und Ruheposition mit voll wirksamer Rückstelleinrichtung,1 is a schematic side view of a piece of seating furniture according to the invention in the working and rest position with a fully effective resetting device,
Fig. 2 in derselben Darstellung wie in Fig. 1 ein Sitz¬ möbel mit unterschiedlicher Position der Rück- Stelleinrichtung,2 in the same representation as in FIG. 1, a piece of seating furniture with a different position of the rear Actuator,
Fig. 3 in derselben Darstellung wie in Fig. 1 und 2 eine abgewandelte Ausführungsform eines Sitzmöbels,3 in the same representation as in FIGS. 1 and 2, a modified embodiment of a piece of seating furniture,
Fig. 4 in derselben Darstellung wie in den Fig. 1 bis 3 eine abgewandelte Ausführungsform eines Sitzmöbels mit Begrenzungseinrichtung für die Rückstellein¬ richtung,4 in the same representation as in FIGS. 1 to 3, a modified embodiment of a piece of seating furniture with a limiting device for the return device,
Fig. 5 in einem Kraft-Weg-Diagramm eine Federcharakte¬ ristik mit herkömmlicher Veränderung der Vorspan¬ nung und5 in a force-displacement diagram, a spring characteristic with a conventional change in the preload and
Fig. 6 in einem Kraft-Weg-Diagramm eine Federcharakte¬ ristik mit der erfindungsgemäßen Gewichtsanpassung.6 in a force-displacement diagram, a spring characteristic with the weight adjustment according to the invention.
Ein vorzugsweise als Drehstuhl ausgebildetes erfindungsge¬ mäßes Sitzmöbel ist in der Zeichnung allgemein mit 1 be¬ zeichnet und ohne Fußgestell dargestellt.A piece of seating furniture according to the invention, preferably designed as a swivel chair, is generally designated 1 in the drawing and is shown without a base frame.
Der Drehstuhl 1 weist einen als Träger dienenden Lagerbock 2 mit einer Aufnahme 3 für das nicht dargestellte Fußge¬ stell auf. Am vorderen oberen Ende des Lagerbocks 2 ist ein fester Drehpunkt 4 vorgesehen, um welchen um eine horizon- tale Schwenkachse 5 der vordere Bereich eines Sitzes 6 mit Sitzfläche 7 angelenkt ist.The swivel chair 1 has a bearing block 2 serving as a carrier with a receptacle 3 for the foot frame (not shown). At the front upper end of the bearing block 2, a fixed pivot point 4 is provided, around which a horizontal tale pivot axis 5 of the front region of a seat 6 with a seat 7 is articulated.
An der Unterseite des Sitzes 6 im Bereich etwas hinter der Mitte des Sitzes sind in einer Schwenkhebelanlenkung 8 um eine Anlenkachse 9 gelenkig zwei Schwenkhebel 10 angelenkt, welche einen vorderen Abschnitt 10a, einen mittleren Ab¬ schnitt 10b und einen hinteren Abschnitt 10c aufweisen, wo¬ bei der hintere Abschnitt 10c gegenüber dem mittleren Ab¬ schnitt 10b etwa rechtwinklig abgewinkelt ist und eine Rückenlehne 11 trägt. Der vordere Abschnitt 10a und der mittlere Abschnitt 10b der Schwenkhebel 10 stehen in einem zur Standfläche hin stumpfen Winkel, bevorzugt in einer Größenordnung von 160° bis 170°.On the underside of the seat 6 in the area somewhat behind the center of the seat, two pivot levers 10 are articulated in a pivot lever linkage 8 about a pivot axis 9, which have a front section 10a, a middle section 10b and a rear section 10c, where in which the rear section 10c is angled approximately at right angles to the central section 10b and carries a backrest 11. The front section 10a and the middle section 10b of the swivel levers 10 are at an obtuse angle to the standing surface, preferably in the order of 160 ° to 170 °.
Die vorderen Abschnitte 10a der Schwenkhebel 10 sind ge¬ lenkig (Gelenk 12) jeweils mit je einem Hebel 13 verbunden, welcher in einem festen Drehpunkt 14 am Lagerbock 2 drehbar gelagert ist.The front sections 10a of the pivot levers 10 are articulated (joint 12) each connected to a lever 13 which is rotatably mounted on the bearing block 2 in a fixed pivot point 14.
Durch diese Ausgestaltung erfolgt bei einer Gewichtsverla¬ gerung nach hinten durch einen Benutzer eine Verschwenkung des Sitzes 2 um die Schwenkachse 5 nach unten, während sich gleichzeitig aufgrund der Ausbildung der Schwenkhebel 10 mit den Hebeln 13 eine überproportionale Neigungsverände¬ rung der Rückenlehne 11 einstellt. Dies ist aus Fig. 1 deutlich zu erkennen, denn der mit Ll bezeichnete Abstand der Oberkante der Schwenkhebel 10 gegenüber der Sitzober¬ kante in der Ruheposition ist deutlich größer als der mit L2 bezeichnete Abstand in der gestrichelt dargestellten ab¬ gesenkten Position.With this configuration, when the weight is shifted to the rear by a user, the seat 2 is pivoted downward about the pivot axis 5, while at the same time a disproportionate change in the inclination of the backrest 11 occurs due to the design of the pivot lever 10 with the levers 13. This is from Fig. 1st can be clearly seen, because the distance between the upper edge of the swivel levers 10 and L1 in relation to the upper edge of the seat in the rest position is significantly larger than the distance with L2 in the lowered position shown in dashed lines.
Um eine automatische Rückstellung des Sitzes 2 und der Rückenlehne 11 aus der abgesenkten Position in die Ruhepo¬ sition bei Gewichtsentlastung zu gewährleisten, ist eine Rückstellfeder 15 vorgesehen. Diese Rückstellfeder ist mit einem Ende fest aber drehbar (Anlenkung 16) am Lagerbock 2 angelenkt und mit dem anderen Ende an den Abschnitten 10a der Schwenkhebel 10, wobei die Einbaulage an den Abschnit¬ ten 10a der Schwenkhebel 10 veränderbar ist. Dazu ist in den Schwenkhebeln 10 im Bereich der Abschnitte 10a eine bo¬ genförmige Langlochführung 17 ausgespart.In order to ensure an automatic return of the seat 2 and the backrest 11 from the lowered position into the resting position when the weight is relieved, a return spring 15 is provided. This return spring is fixed at one end but rotatable (articulation 16) to the bearing block 2 and at the other end to the sections 10a of the pivot lever 10, the installation position at the sections 10a of the pivot lever 10 being changeable. For this purpose, a curved slot guide 17 is recessed in the swivel levers 10 in the area of the sections 10a.
Wie am besten aus Fig. 2 hervorgeht, läßt sich somit die Feder in der Langlochführung aus der Position A bis maximal in die Position B verstellen. Dies hat zur Folge, daß sich das von der Rückstellfeder 15 ausgeübte Drehmoment um die Schwenkachsen 14 bzw. 5 verändern läßt, um eine exakte An¬ passung der Rückstellkraft an unterschiedliche Benutzerge¬ wichte vornehmen zu können. Während in der Position A eine maximale Rückstellkraft wirkt, ist die Rückstellkraft in der Position B bzw. das entsprechende Drehmoment am ge- ringsten. Diese Verstellung des Hebelarmes bzw. des von der Rückstellfeder ausgeübten Drehmomentes ermöglicht gegenüber herkömmlichen Vorspannungsänderungen der Rückstellfedern eine wesentlich bessere und genauere Einstellbarkeit der erforderlichen Rückstellkraft, insbesondere auch in den Grenzbereichen, d.h. für Benutzer mit besonders hohem oder geringem Körpergewicht.As can best be seen from FIG. 2, the spring in the elongated hole guide can thus be adjusted from position A to position B at the maximum. This has the consequence that the torque exerted by the return spring 15 can be changed about the pivot axes 14 or 5 in order to be able to make an exact adaptation of the return force to different user weights. While a maximum restoring force acts in position A, the restoring force in position B or the corresponding torque is at the wrestle. This adjustment of the lever arm or the torque exerted by the restoring spring enables a significantly better and more precise adjustability of the required restoring force compared to conventional bias changes of the restoring springs, in particular also in the limit areas, ie for users with a particularly high or low body weight.
In Fig. 3 ist eine abgewandelte Ausführungsform eines er¬ findungsgemäßen Sitzmöbels 1 dargestellt, wobei dieselben Bezugszeichen wie in den Fig. 1 und 2 verwandt sind, sofern gleiche Teile betroffen sind.FIG. 3 shows a modified embodiment of seating furniture 1 according to the invention, the same reference numerals as in FIGS. 1 and 2 being used if the same parts are concerned.
Im Unterschied zur Ausführungsform nach den Fig. 1 und 2 sind die Schwenkhebel 10 nicht über zusätzliche Hebel 13 am Lagerbock gelagert, sondern unmittelbar im Lagerbock 2, wo¬ bei zur Ermöglichung der Verschiebbarkeit der Schwenkhebel 10 eine Langlochführung 18 im Lagerbock 2 vorgesehen ist. Ansonsten ist der Bewegungsablauf der Synchronmechanik der¬ selbe, wie bei der Ausführungsform nach Fig. 1 und 2, diese Ausführungsform nach Fig. 3 benötigt aber ersichtlich noch weniger Bauteile und ist deshalb noch vorteilhafter.In contrast to the embodiment according to FIGS. 1 and 2, the pivot levers 10 are not mounted on the bearing block via additional levers 13, but directly in the bearing block 2, an elongated hole guide 18 being provided in the bearing block 2 to enable the pivoting lever 10 to be displaced. Otherwise, the movement sequence of the synchronous mechanism is the same as in the embodiment according to FIGS. 1 and 2, but this embodiment according to FIG. 3 obviously requires even fewer components and is therefore even more advantageous.
Die in Fig. 4 dargestellte Ausführungsform eines erfin¬ dungsgemäßen Sitzmöbels 1, hier sind ebenfalls dieselben Bezugszeichen wie in den vorangegangenen Figuren verwandt. entspricht im Prinzip der Ausführungsform nach Fig. 1. Zu¬ sätzlich ist bei diesem Sitzmöbel 1 jedoch auch noch eine Begrenzungseinrichtung vorgesehen, die die Rückstellung der Schwenkhebel 10 derart beschränkt, daß die Schwenkhebel 10 nicht in Kontakt mit der Unterseite des Sitzes 2 gelangen können.The embodiment of a piece of seating furniture 1 according to the invention shown in FIG. 4, the same reference numerals are used here as in the previous figures. corresponds in principle to the embodiment according to FIG. 1. In addition, however, a limitation device is also provided in this seating furniture 1, which limits the return of the pivoting levers 10 in such a way that the pivoting levers 10 cannot come into contact with the underside of the seat 2.
Dabei weist die Begrenzungseinrichtung eine an der Unter¬ seite der Schwenkhebelanlenkung 8 angeordnete bügeiförmige Langlochführung 20 auf, welche mit einem am Lagerbock 3 angeordneten stiftförmigen Element 19 zusammenwirkt und gegenüber diesem begrenzt verschiebbar geführt ist. Dabei ist die Langlochführung 20 so ausgebildet, daß am Anschlag der Langlochführung 20 am stiftförmigen Element 19 zwischen den Schwenkhebeln 10 bzw. den Bereichen 10b der Schwenkhe¬ bel und der Unterseite des Sitzes 2 in Ruheposition ein Freiraum verbleibt.The limiting device has a bow-shaped elongated hole guide 20 arranged on the underside of the pivot lever linkage 8, which cooperates with a pin-shaped element 19 arranged on the bearing block 3 and is guided so as to be displaceable to a limited extent. The slot guide 20 is designed such that a free space remains at the stop of the slot guide 20 on the pin-shaped element 19 between the pivot levers 10 or the regions 10b of the pivot lever and the underside of the seat 2 in the rest position.
In den Fig. 5 und 6 ist die Wirksamkeit der Verstellung der Rückstellfeder 15 zu erkennen.5 and 6, the effectiveness of the adjustment of the return spring 15 can be seen.
Während Fig. 5 eine herkömmliche Verstellung mittels Verän¬ derung der VorSpannkraft der Feder zeigt, ist in Fig. 6 der Verstellbereich mittels der erfindungsgemäßen Veränderung der Einbaulage der Feder zu erkennen. Wie unmittelbar aus den Figuren 5 und 6 hervorgeht, ist der Verstellbereich bei der erfindungsgemäßen Ausgestaltung (Fig. 6) wesentlich größer, was insbesondere in den Grenzbereichen die Ein¬ stellung wesentlich erleichtert.5 shows a conventional adjustment by changing the pretensioning force of the spring, in FIG. 6 the adjustment range can be seen by changing the installation position of the spring according to the invention. As can be seen directly from FIGS. 5 and 6, the adjustment range is at the embodiment according to the invention (FIG. 6) is considerably larger, which considerably simplifies the adjustment, particularly in the border areas.
Natürlich ist die Erfindung nicht auf die dargestellten Ausführungsbeispiele beschränkt. Weitere Ausgestaltungen der Erfindung sind möglich, ohne den Grundgedanken zu ver¬ lassen. Of course, the invention is not limited to the exemplary embodiments shown. Further refinements of the invention are possible without leaving the basic idea.

Claims

Ansprüche; Expectations;
1. Sitzmöbel mit einem im vorderen Bereich um eine horizontale Schwenkachse schwenkbaren, in der Neigung veränderbaren Sitz und einer in .Abhängigkeit von der Neigungsänderung des Sitzes zwangsweise in der Neigung überproportional verän¬ derbaren Rückenlehne, wobei der Sitz mit Schwenkhebeln ge¬ lenkig verbunden ist, deren eine Enden die Rückenlehne tra¬ gen und deren andere Enden am Lagerbock des Stuhlgestells drehbar gelagert sind, wobei die Schwenkhebel im Abstand vom hinteren Ende des Sitzes am Sitz angelenkt sind und die am Lagerbock drehbar gelagerten Abschnitte der Schwenkhebel zu den sich an die Anlenkachse des Sitzes anschließenden Abschnitten der Schwenkhebel in einem zur Standfläche hin stumpfen Winkel stehen, wobei eine Rückstellfeder zur selbsttätigen Rückstellung der Sitzfläche und der Rücken¬ lehne von der Ruhe- in die Arbeitsposition bei Gewichts¬ entlastung vorgesehen ist, dadurch gekennzeichnet, daß die Schwenkachse (12) der Schwenkhebel (10) gegenüber dem Lagerbock (2) verschiebbar ist, und daß die Rückstell¬ feder (15) zwischen dem Lagerbock (2) und den am Lagerbock (2) drehbar gelagerten Abschnitten (10a) der Schwenkhebel (10) angeordnet und in ihrer Einbaulage gegenüber den Schwenklagern (4,14) derart veränderbar einstellbar ist. daß das von der Federkraft ausgeübte Drehmoment um die Schwenkachsen veränderbar ist.1. Seating furniture with a seat that can be swiveled in the front area about a horizontal swivel axis, the inclination of which can be changed, and a backrest that can be changed disproportionately depending on the change in inclination of the seat, the seat being articulated with swivel levers, one end of which supports the backrest and the other ends of which are rotatably mounted on the bearing block of the chair frame, the pivoting levers being articulated on the seat at a distance from the rear end of the seat and the sections of the pivoting lever rotatably mounted on the bearing block relative to the pivoting axis of the Sections of the swivel levers adjoining the seat are at an obtuse angle to the standing surface, a return spring being provided for automatically resetting the seat surface and the backrest from the rest position into the working position when the weight is relieved, characterized in that the pivot axis (12) the swivel lever (10) is displaceable over the bearing block (2), and that the return spring (15) is arranged between the bearing block (2) and the sections (10a) of the pivoting lever (10) rotatably mounted on the bearing block (2) and in their installed position relative to the pivoting bearings (4,14) can be adjusted in this way. that the torque exerted by the spring force can be changed about the pivot axes.
2. Sitzmöbel nach Anspruch 1, dadurch gekennzeichnet, daß die Rückstellfeder (15) mit einem Ende fest am Lager¬ bock (2) angelenkt und mit dem anderen Ende in einer lang- lochförmigen Führung (17) der Schwenkhebel (10) verstellbar angeordnet ist.2. Seating furniture according to claim 1, characterized in that the return spring (15) with one end articulated on the bearing block (2) and with the other end in an elongated hole-shaped guide (17) the pivot lever (10) is arranged adjustable .
3. Sitzmöbel nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Rückstellung der Schwenkhebel (10) mittels einer Begrenzungseinrichtung (19,20) derart beschränkt ist, daß die Schwenkhebel (10) nicht in Kontakt mit der Sitzunter¬ seite gelangen können.3. Seating furniture according to claim 1 or 2, characterized in that the provision of the pivot lever (10) by means of a limiting device (19, 20) is limited such that the pivot lever (10) cannot come into contact with the seat bottom.
4. Sitzmöbel nach Anspruch 3, dadurch gekennzeichnet, daß die Begrenzungseinrichtung von einer an der Unterseite der Schwenkhebelanlenkung (8) angeordneten Langlochführung (20) gebildet ist, in welche ein am Lagerbock (2) angeord¬ netes stiftformiges Element (19) eingreift. 4. Seating furniture according to claim 3, characterized in that the limiting device is formed by an elongated hole guide (20) arranged on the underside of the pivot lever linkage (8), in which a pin-shaped element (19) engages on the bearing block (2).
EP94913565A 1993-04-14 1994-04-09 Chair Expired - Lifetime EP0645974B1 (en)

Applications Claiming Priority (3)

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DE4312113A DE4312113C1 (en) 1993-04-14 1993-04-14 Seating
DE4312113 1993-04-14
PCT/EP1994/001105 WO1994023614A1 (en) 1993-04-14 1994-04-09 Chair

Publications (2)

Publication Number Publication Date
EP0645974A1 true EP0645974A1 (en) 1995-04-05
EP0645974B1 EP0645974B1 (en) 1997-02-19

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EP (1) EP0645974B1 (en)
JP (1) JPH07507957A (en)
AT (1) ATE148984T1 (en)
DE (2) DE4312113C1 (en)
DK (1) DK0645974T3 (en)
ES (1) ES2098933T3 (en)
GR (1) GR3023398T3 (en)
WO (1) WO1994023614A1 (en)

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Publication number Publication date
JPH07507957A (en) 1995-09-07
DE4312113C1 (en) 1994-10-27
US5584533A (en) 1996-12-17
EP0645974B1 (en) 1997-02-19
DK0645974T3 (en) 1997-07-28
ES2098933T3 (en) 1997-05-01
ATE148984T1 (en) 1997-03-15
GR3023398T3 (en) 1997-08-29
WO1994023614A1 (en) 1994-10-27
DE59401826D1 (en) 1997-03-27

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