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WO2008110669A1 - Mechanism for the synchronous adjustment of the tilting tension of a seat - Google Patents

Mechanism for the synchronous adjustment of the tilting tension of a seat Download PDF

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Publication number
WO2008110669A1
WO2008110669A1 PCT/FR2007/000420 FR2007000420W WO2008110669A1 WO 2008110669 A1 WO2008110669 A1 WO 2008110669A1 FR 2007000420 W FR2007000420 W FR 2007000420W WO 2008110669 A1 WO2008110669 A1 WO 2008110669A1
Authority
WO
WIPO (PCT)
Prior art keywords
tilting
backrest
spring
axis
seat
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.)
Ceased
Application number
PCT/FR2007/000420
Other languages
French (fr)
Inventor
Laurent Troesch
Jean Antoine Krommenaker
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.)
Steelcase SA
Original Assignee
Steelcase SA
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 Steelcase SA filed Critical Steelcase SA
Priority to PCT/FR2007/000420 priority Critical patent/WO2008110669A1/en
Priority to EP07731117A priority patent/EP2129263A1/en
Publication of WO2008110669A1 publication Critical patent/WO2008110669A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C1/00—Chairs adapted for special purposes
    • A47C1/02—Reclining or easy chairs
    • A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03255—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest with a central column, e.g. rocking office chairs
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C1/00—Chairs adapted for special purposes
    • A47C1/02—Reclining or easy chairs
    • A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03261—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means
    • A47C1/03266—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with adjustable elasticity
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C1/00—Chairs adapted for special purposes
    • A47C1/02—Reclining or easy chairs
    • A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03261—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means
    • A47C1/03272—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with coil springs

Definitions

  • the present invention relates to a tilt tension adjustment mechanism of a seat incorporating the connection with at least one backrest arm of said seat.
  • Known mechanisms are generally based on a torsion spring disposed at the shaft of rotation of the backrest, and whose stiffness can be adjusted by the user with the aid of an outer wheel.
  • the adjustment of the voltage is long, since it requires a large number of rotations of said wheel (typically from 10 to 20 or even 25 turns to scan the entire amplitude of the adjustment), which is hardly comfortable for said user.
  • the object of the present invention is to provide a system with a quick adjustment, with a usual rotary dial control mode, which however has a limited stroke (1 to 2 turns).
  • the system of the invention must guarantee the absence of a shirt-pulling effect and an excessive rise in the front of the seat (no compression zones under the thighs), while having a good balance in all work positions without obligation to block the position.
  • the synchronized adjustment mechanism of the invention which applies to seats whose backs are pivotally mounted on a support placed under the base of the seat surmounting the base, is characterized in principal that it comprises: - at least one tension spring prestressed to at least one predetermined minimum tension;
  • At least one compression spring whose stroke is adjustable
  • the compression and traction springs are arranged on either side of the axis of tilting of the backrest.
  • the use of these two springs with a combined action makes it possible to have a working curve very close to that obtained with the aid of traditional torsion springs.
  • one of the ends of each spring is mounted on the support of the free seat in rotation axis parallel to the axis of tilting of the backrest, the other end being connected to a plate secured to the tree of tilting of the backrest.
  • Said support comprises in fact a cradle provided with a bottom and side walls, a shaft rotatably mounted in said side walls separating said cradle in two spaces respectively receiving at least one compression spring and at least one tension spring, said shaft being on the one hand surmounted by the aforementioned plate and supporting on the other hand at least one tilting backrest arm.
  • the springs are oriented so that their axes are in at least one plane perpendicular to the axis of tilting of the backrest.
  • the plans in question are also of course perpendicular to the average plane of the seat.
  • Each compression spring is mounted on a telescopic shaft having two end heads on which the axial ends of the spring are supported.
  • each compression spring is effected in particular by varying the length of the telescopic shaft, and therefore the energy accumulated by the spring.
  • One of the heads of said shaft is articulated to the cradle, the other head resting against a curved surface of the plate along which it can move along a path in a plane perpendicular to the tilting axis, to modify the length of the shaft and consequently the tension of the spring.
  • Said curved surface therefore does not correspond to an arc having a diameter equal to the shortest length of the telescopic shaft, but to an arc of greater diameter, hence a variation of the length of this shaft depending on the direction moving the head in contact with the curved surface.
  • said curved surface is provided with lateral walls so as to constitute a guide rail for an outgrowth of the head moving between said walls.
  • the walls in question provide lateral guidance to maintain the displacement of the axis of the telescopic shaft in a single plane.
  • the curved surface, the head applied and the walls are fitted with a notch.
  • each setting position of the control lever actuated by the user bijectively corresponds to a particular position of the telescopic shaft, and a corresponding torque of the compression and traction springs.
  • the head applying on the curved surface of the plate has a lateral lug cooperating with the two parallel branches of a fork movable in rotation and whose rotary displacement drives the lug and therefore the head along the curved surface of the platinum, the lug being otherwise free in translation within the branches.
  • This system ensures the rotational displacement of the telescopic shaft, and therefore the change of orientation of the axis of the compression spring.
  • said fork is secured to a member having a toothed arcuate track meshing with a toothed wheel disposed on a shaft controlled in rotation by a wheel.
  • the user actuates the latter, he rotates the member comprising the fork via the toothed wheel / the track, and thus to change the inclination of the axis of the compression spring.
  • FIG. 1 is a perspective view of the cradle disposed under the seat cushion and comprising means for adjusting the tilting tension of the backrest of said seat;
  • FIG. 4 is a diagram showing several operating curves of a mechanism according to the invention.
  • the cradle (1) located under the seat of the seat (not shown) comprises two springs: a compression spring (2) and a tension spring (3) arranged on both sides the tree (4) for tilting the backrest, which is subject to the branches (5, 5 ') for fixing the backrest disposed laterally to the cradle (1).
  • the springs (2, 3) are separated by a plate (6) with which they cooperate.
  • the compression spring (2) is mounted on a shaft telescopic (7), free to rotate at its distal end of the plate (6) around the shaft (8).
  • the other end of the shaft (7) has a head (9) which is movable relative to a notched curved surface (10). This notched surface (10) is limited, laterally, by two walls (11, 11 ') also notched, the assembly forming a sort of curved curved slide.
  • the spring (2) disposed on the shaft (7) biases the head (9) in contact with the toothed surface (10).
  • the traction spring (3) is mounted at one of its ends to the cradle (1), via a terminal hook cooperating with a lug (13) of the cradle (1) of suitable shape. At its other end, the tension spring (3) is fixed to the plate (6) in an orifice (14) formed in a fin (15) of the plate (6) oriented perpendicular to the toothed slide (10). As will be seen in the following, the orifice (14) is provided so that the fixing of the end of the tension spring (3) can take several discrete positions also allowing adjustment.
  • the shape of the orifice (14) appears more precisely in Figure (3), and comprises in fact three parallel grooves (16) each of which can accommodate the uncoupled end of the tension spring (3).
  • the orientation of the spring axis (3), and therefore its tension, depends on the groove (16) in which the end of the spring is fixed.
  • the operation is as follows: when the user wants to change the tension of its backrest, it acts on the knob (17) which rotates a shaft (18) at the end of which is secured a toothed wheel or notched (19) cooperating with teeth or notches of a notched curvilinear surface (20) formed on the periphery of the inner recess of an oblong piece (21).
  • the oblong piece (21) Opposite the toothed surface (20), the oblong piece (21) comprises a fork (22), more visible in FIGS. 2 and 3, comprising two branches (23, 23 ') enclosing a lug (24) protruding from the head (9).
  • This lug can slide inside the two branches (23, 23 '), and moves relatively to the latter as the oblong piece (21) rotates in one direction or the other, which direction is controlled by the rotation of the control wheel (17).
  • This figure also shows that the head (9) has a notched curved end surface (26), which prevents any undesirable movement of the shaft (7) compression spring which would result in changing the setting theoretically determined by the relative position of the toothed wheel (19) and the toothed surface (20).
  • FIG. 4 shows examples of curves taken with a system according to the invention, using different combinations of tension and compression springs, when the tension is minimum (lower group of curves) and maximum (higher group).
  • the values on the abscissa correspond to the tilting angle, ranging from 0 ° to 25 °, while the values or ordinates are the resistant torques of the file going from 25000 to 260 000 N / mm.
  • the curves are almost linear, with a slope that augurs the right balance at each position.
  • the major feature of the invention is the combination of a compression spring (2) and a tension spring (3) in place of a torsion spring as conventionally used in this type of mechanism.
  • the actual control means an example of which has been previously discussed, should not be considered as limiting of this invention.

Landscapes

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

Abstract

The invention relates to a mechanism for the synchronous adjustment of the tilting tension of a seat, the back being pivotally mounted on a holder located under the seating area of the seat above the base, an adjustable return means being provided between said holder and said back. The mechanism includes: at least one pulling spring (3) preset at at least one minimum predetermined tension; at least one compression spring (2) having an adjustable stroke; said springs (2, 3) applying a combined action onto the back in order to counteract the tilting thereof.

Description

Mécanisme de réglage synchronisé de la tension de basculement d'un siège Synchronized adjustment mechanism for tilting tension of a seat

La présente invention concerne un mécanisme de réglage de tension de basculement d'un siège incorporant la liaison avec au moins un bras de dossier dudit siège.The present invention relates to a tilt tension adjustment mechanism of a seat incorporating the connection with at least one backrest arm of said seat.

Les mécanismes connus sont en général basés sur un ressort de torsion disposé au niveau de l'arbre de rotation du dossier, et dont la raideur peut être réglée par l'utilisateur à l'aide d'une molette extérieure. Pour ce type de configuration, le réglage de la tension est cependant long, car nécessitant un grand nombre de rotations de ladite molette (typiquement de 10 à 20, voire 25 tours pour balayer toute l'amplitude du réglage), ce qui n'est guère confortable pour ledit utilisateur.Known mechanisms are generally based on a torsion spring disposed at the shaft of rotation of the backrest, and whose stiffness can be adjusted by the user with the aid of an outer wheel. For this type of configuration, however, the adjustment of the voltage is long, since it requires a large number of rotations of said wheel (typically from 10 to 20 or even 25 turns to scan the entire amplitude of the adjustment), which is hardly comfortable for said user.

Par ailleurs, ce type de mécanisme reste cher, et a une incidence économiquement non négligeable sur le prix total du siège.In addition, this type of mechanism remains expensive, and has a significant economic impact on the total price of the headquarters.

L'objectif de la présente invention est de proposer un système offrant un réglage rapide, avec un mode de commande habituel par molette rotative, laquelle présente cependant une course limitée (1 à 2 tours). En corollaire à cet objectif, le système de l'invention doit garantir l'absence d'effet tire-chemise et de remontée trop importante de l'avant de l'assise (pas de zones de compression sous les cuisses), tout en disposant d'un bon équilibre dans toutes les positions de travail sans obligation de blocage de la position.The object of the present invention is to provide a system with a quick adjustment, with a usual rotary dial control mode, which however has a limited stroke (1 to 2 turns). As a corollary to this objective, the system of the invention must guarantee the absence of a shirt-pulling effect and an excessive rise in the front of the seat (no compression zones under the thighs), while having a good balance in all work positions without obligation to block the position.

Enfin, il doit s'agir d'un mécanisme permettant un mouvement synchronisé entre le dossier et l'assise, qui concerne par conséquent aussi bien le dossier que l'assise, dans un rapport bien défini pour obtenir un mouvement ergonomique du siège.Finally, it must be a mechanism allowing a synchronized movement between the backrest and the seat, which therefore concerns both the backrest and the seat, in a well defined report to obtain an ergonomic movement of the seat.

Le mécanisme de réglage synchronisé de l'invention, qui s'applique à des sièges dont les dossiers sont montés pivotants sur un support placé sous l'assise du siège surmontant la base, se caractérise à titre principal en ce qu'il comporte : - au moins un ressort de traction précontraint à au moins une tension minimale prédéfinie ;The synchronized adjustment mechanism of the invention, which applies to seats whose backs are pivotally mounted on a support placed under the base of the seat surmounting the base, is characterized in principal that it comprises: - at least one tension spring prestressed to at least one predetermined minimum tension;

- au moins un ressort de compression dont la course est réglable ;at least one compression spring whose stroke is adjustable;

- lesdits ressorts exerçant une action conjuguée sur le dossier visant à s'opposer à son basculement. Cette solution à deux ressorts ayant des comportement mécanique inversés permet un bon équilibrage dans toutes les positions, pour les utilisateurs de 40 à 120 kilos, sans effet d'affaissement ou de rejet du siège. Le réglage de tension lié au poids de chaque utilisateur et à sa morphologie s'effectue par ailleurs rapidement, avec un équilibrage correct quasi immédiat.- said springs exercising a combined action on the file to oppose its changeover. This two-spring solution with reversed mechanical behavior allows a good balancing in all positions, for users from 40 to 120 kilos, without collapse or rejection of the seat. The tension adjustment related to the weight of each user and its morphology is also done quickly, with a correct balance almost immediate.

Selon l'invention, les ressorts de compression et de traction sont disposés de part et d'autre de l'axe de basculement du dossier. L'utilisation de ces deux ressorts à action conjuguée permet d'avoir une courbe de travail très proche de celle qui était obtenue à l'aide de ressorts de torsion traditionnels.According to the invention, the compression and traction springs are arranged on either side of the axis of tilting of the backrest. The use of these two springs with a combined action makes it possible to have a working curve very close to that obtained with the aid of traditional torsion springs.

Plus précisément, dans le mécanisme de l'invention, l'une des extrémités de chaque ressort est montée sur le support de l'assise libre en rotation d'axe parallèle à l'axe de basculement du dossier, l'autre extrémité étant reliée à une platine solidaire de l'arbre de basculement du dossier.More specifically, in the mechanism of the invention, one of the ends of each spring is mounted on the support of the free seat in rotation axis parallel to the axis of tilting of the backrest, the other end being connected to a plate secured to the tree of tilting of the backrest.

Ledit support comporte en fait un berceau muni d'un fond et de parois latérales, un arbre monté rotatif dans lesdites parois latérales séparant ledit berceau en deux espaces recevant respectivement au moins un ressort de compression et au moins un ressort de traction, ledit arbre étant d'une part surmonté par la platine précitée et supportant d'autre part au moins un bras de dossier basculant.Said support comprises in fact a cradle provided with a bottom and side walls, a shaft rotatably mounted in said side walls separating said cradle in two spaces respectively receiving at least one compression spring and at least one tension spring, said shaft being on the one hand surmounted by the aforementioned plate and supporting on the other hand at least one tilting backrest arm.

Les ressorts sont orientés de telle sorte que leurs axes sont dans au moins un plan perpendiculaire à l'axe de basculement du dossier. Les plans en question sont d'ailleurs également d'allure perpendiculaire au plan moyen de l'assise. Chaque ressort de compression est monté sur un arbre télescopique comportant deux têtes d'extrémité sur lesquelles s'appuient les extrémités axiales du ressort.The springs are oriented so that their axes are in at least one plane perpendicular to the axis of tilting of the backrest. The plans in question are also of course perpendicular to the average plane of the seat. Each compression spring is mounted on a telescopic shaft having two end heads on which the axial ends of the spring are supported.

Le réglage de la tension de chaque ressort de compression s'effectue notamment en faisant varier la longueur de l'arbre télescopique, et donc l'énergie accumulée par le ressort.The adjustment of the tension of each compression spring is effected in particular by varying the length of the telescopic shaft, and therefore the energy accumulated by the spring.

L'une des têtes dudit arbre est articulée au berceau, l'autre tête s'appuyant contre une surface incurvée de la platine le long de laquelle elle peut se déplacer selon un trajet situé dans un plan perpendiculaire à l'axe de basculement, en vue de modifier la longueur de l'arbre et par conséquent la tension du ressort. Ladite surface incurvée ne correspond dès lors pas à un arc de cercle de diamètre égal à la plus petite longueur de l'arbre télescopique, mais à un arc de diamètre supérieur, d'où une variation de la longueur de cet arbre en fonction du sens de déplacement de la tête au contact de la surface incurvée.One of the heads of said shaft is articulated to the cradle, the other head resting against a curved surface of the plate along which it can move along a path in a plane perpendicular to the tilting axis, to modify the length of the shaft and consequently the tension of the spring. Said curved surface therefore does not correspond to an arc having a diameter equal to the shortest length of the telescopic shaft, but to an arc of greater diameter, hence a variation of the length of this shaft depending on the direction moving the head in contact with the curved surface.

De préférence, ladite surface incurvée est dotée de murets latéraux de manière à constituer une glissière de guidage pour une excroissance de la tête se déplaçant entre lesdits murets. Les murets en question procurent un guidage latéral visant à maintenir le déplacement de l'axe de l'arbre télescopique dans un plan unique.Preferably, said curved surface is provided with lateral walls so as to constitute a guide rail for an outgrowth of the head moving between said walls. The walls in question provide lateral guidance to maintain the displacement of the axis of the telescopic shaft in a single plane.

La surface incurvée, la tête s'y appliquant et les murets sont munis d'un crantage.The curved surface, the head applied and the walls are fitted with a notch.

Un tel crantage a notamment pour vocation d'éviter les glissements non désirés d'une pièce par rapport à l'autre, qui perturberaient le réglage. En l'espèce, chaque position de réglage de la manette de commande actionnée par l'utilisateur correspond bijectivement à une position particulière de l'arbre télescopique, et à un couple de contraintes correspondantes des ressorts de compression et de traction.Such notching is intended in particular to avoid unwanted sliding of a part relative to the other, which would disturb the setting. In this case, each setting position of the control lever actuated by the user bijectively corresponds to a particular position of the telescopic shaft, and a corresponding torque of the compression and traction springs.

La tête s'appliquant sur la surface incurvée de la platine comporte un ergot latéral coopérant avec les deux branches parallèles d'une fourche mobile en rotation et dont le déplacement rotatif entraîne l'ergot et donc la tête le long de la surface incurvée de la platine, l'ergot étant par ailleurs libre en translation à l'intérieur des branches.The head applying on the curved surface of the plate has a lateral lug cooperating with the two parallel branches of a fork movable in rotation and whose rotary displacement drives the lug and therefore the head along the curved surface of the platinum, the lug being otherwise free in translation within the branches.

Ce système assure le déplacement en rotation de l'arbre télescopique, et par conséquent le changement d'orientation de l'axe du ressort de compression. Pour le réglage de la tension du dossier, ladite fourche est solidaire d'un organe comportant une piste en arc de cercle dentée engrenant avec une roue dentée disposée sur un arbre commandé en rotation par une molette. Lorsque l'utilisateur actionne cette dernière, il fait tourner l'organe comportant la fourche via la roue dentée / la piste, et donc à modifier l'inclinaison de l'axe du ressort de compression.This system ensures the rotational displacement of the telescopic shaft, and therefore the change of orientation of the axis of the compression spring. For the adjustment of the tension of the backrest, said fork is secured to a member having a toothed arcuate track meshing with a toothed wheel disposed on a shaft controlled in rotation by a wheel. When the user actuates the latter, he rotates the member comprising the fork via the toothed wheel / the track, and thus to change the inclination of the axis of the compression spring.

Le mécanisme de réglage de l'invention va à présent être décrit plus en détail, en référence aux figures, pour lesquelles :The adjustment mechanism of the invention will now be described in more detail with reference to the figures for which:

- la figure 1 est une vue en perspective du berceau disposé sous l'assise du siège et comportant les moyens de réglage de la tension de basculement du dossier dudit siège ;- Figure 1 is a perspective view of the cradle disposed under the seat cushion and comprising means for adjusting the tilting tension of the backrest of said seat;

- la figure 2 représente, toujours en perspective, un détail dudit mécanisme vu d'un côté ;- Figure 2 shows, still in perspective, a detail of said mechanism seen from one side;

- la figure 3 représente la partie montrée en figure 2, vue de l'autre côté ; et- Figure 3 shows the part shown in Figure 2, seen from the other side; and

- la figure 4 est un diagramme représentant plusieurs courbes de fonctionnement d'un mécanisme selon l'invention.- Figure 4 is a diagram showing several operating curves of a mechanism according to the invention.

En référence à la figure 1 , le berceau (1 ), situé sous l'assise du siège (non représentée) comporte deux ressorts : un ressort de compression (2) et un ressort de traction (3) disposés de part et d'autre de l'arbre (4) de basculement du dossier, lequel est assujetti aux branches (5, 5') de fixation du dossier disposées latéralement au berceau (1). Les ressorts (2, 3) sont séparés par une platine (6) avec laquelle ils coopèrent. Le ressort de compression (2) est monté sur un arbre télescopique (7), libre en rotation à son extrémité distale de la platine (6) autour de l'arbre (8). L'autre extrémité de l'arbre (7) comporte une tête (9) qui peut se déplacer par rapport à une surface incurvée crantée (10). Cette surface crantée (10) est limitée, latéralement, par deux murets (11 , 11 ') également crantés, l'ensemble formant en quelque sorte une glissière incurvée crantée.Referring to Figure 1, the cradle (1), located under the seat of the seat (not shown) comprises two springs: a compression spring (2) and a tension spring (3) arranged on both sides the tree (4) for tilting the backrest, which is subject to the branches (5, 5 ') for fixing the backrest disposed laterally to the cradle (1). The springs (2, 3) are separated by a plate (6) with which they cooperate. The compression spring (2) is mounted on a shaft telescopic (7), free to rotate at its distal end of the plate (6) around the shaft (8). The other end of the shaft (7) has a head (9) which is movable relative to a notched curved surface (10). This notched surface (10) is limited, laterally, by two walls (11, 11 ') also notched, the assembly forming a sort of curved curved slide.

Le ressort (2) disposé sur l'arbre (7) sollicite la tête (9) au contact de la surface crantée (10).The spring (2) disposed on the shaft (7) biases the head (9) in contact with the toothed surface (10).

Le ressort de traction (3) est monté, à l'une de ses extrémités, au berceau (1), par l'intermédiaire d'un crochet terminal coopérant avec un ergot (13) du berceau (1 ) de forme adéquate. A son autre extrémité, le ressort de traction (3) est fixé à la platine (6), dans un orifice (14) pratiqué dans une ailette (15) de la platine (6) orientée perpendiculairement à la glissière crantée (10). Comme on le verra dans la suite, l'orifice (14) est prévu de telle sorte que la fixation de l'extrémité du ressort de traction (3) puisse prendre plusieurs positions discrètes permettant également un réglage.The traction spring (3) is mounted at one of its ends to the cradle (1), via a terminal hook cooperating with a lug (13) of the cradle (1) of suitable shape. At its other end, the tension spring (3) is fixed to the plate (6) in an orifice (14) formed in a fin (15) of the plate (6) oriented perpendicular to the toothed slide (10). As will be seen in the following, the orifice (14) is provided so that the fixing of the end of the tension spring (3) can take several discrete positions also allowing adjustment.

La forme de l'orifice (14) apparaît plus précisément en figure (3), et comprend en fait trois rainures parallèles (16) pouvant chacune loger l'extrémité unciforme du ressort de traction (3). L'orientation de l'axe du ressort (3), et donc sa tension, dépend de la rainure (16) dans laquelle l'extrémité du ressort est fixée. Le fonctionnement est le suivant : lorsque l'utilisateur veut modifier la tension de son dossier, il agit sur la molette (17) qui entraîne en rotation un arbre (18) à l'extrémité duquel est assujettie une roue dentée ou crantée (19) coopérant avec des dents ou crans d'une surface curviligne crantée (20) pratiquée sur la périphérie de l'évidement intérieur d'une pièce (21) oblongue. A l'opposé de la surface crantée (20), la pièce oblongue (21) comporte une fourche (22), plus visible en figures 2 et 3, comportant deux branches (23, 23') enserrant un ergot (24) dépassant de la tête (9). Cet ergot peut coulisser à l'intérieur des deux branches (23, 23'), et se déplace relativement à ces dernières à mesure de la rotation de la pièce oblongue (21) dans un sens ou dans l'autre, sens qui est commandé par la rotation de la molette de commande (17).The shape of the orifice (14) appears more precisely in Figure (3), and comprises in fact three parallel grooves (16) each of which can accommodate the uncoupled end of the tension spring (3). The orientation of the spring axis (3), and therefore its tension, depends on the groove (16) in which the end of the spring is fixed. The operation is as follows: when the user wants to change the tension of its backrest, it acts on the knob (17) which rotates a shaft (18) at the end of which is secured a toothed wheel or notched (19) cooperating with teeth or notches of a notched curvilinear surface (20) formed on the periphery of the inner recess of an oblong piece (21). Opposite the toothed surface (20), the oblong piece (21) comprises a fork (22), more visible in FIGS. 2 and 3, comprising two branches (23, 23 ') enclosing a lug (24) protruding from the head (9). This lug can slide inside the two branches (23, 23 '), and moves relatively to the latter as the oblong piece (21) rotates in one direction or the other, which direction is controlled by the rotation of the control wheel (17).

Lorsque l'utilisateur imprime une rotation à la molette (17), la pièce (21) guidée par rapport au berceau (1) notamment par la glissière (25) et la roue crantée (19) se déplace elle-même selon un mouvement de rotation qui lui permet d'entraîner l'ergot (24) vers le bas ou vers le haut, selon le sens de la rotation. La tension du dossier est minimale dans la position représentée en figure 1 , dans laquelle le ressort de compression (2) est en position basse. A l'inverse, dans la position représentée en figure 2, le ressort de compression (2) est en position haute, et la tension du dossier est maximale. Elle est médiane dans la position du ressort (2) représenté en figure 3. Cette figure montre également que la tête (9) comporte une surface d'extrémité incurvée crantée (26), qui empêche tout déplacement indésirable de l'arbre (7) du ressort de compression qui aboutirait à modifier le réglage théoriquement déterminé par la position relative de la roue crantée (19) et de la surface crantée (20).When the user prints a rotation at the wheel (17), the part (21) guided relative to the cradle (1) in particular by the slide (25) and the toothed wheel (19) moves itself in a movement of rotation that allows it to drive the lug (24) downward or upward, depending on the direction of rotation. The backrest tension is minimal in the position shown in FIG. 1, in which the compression spring (2) is in the low position. Conversely, in the position shown in Figure 2, the compression spring (2) is in the up position, and the backrest tension is maximum. It is median in the position of the spring (2) shown in Figure 3. This figure also shows that the head (9) has a notched curved end surface (26), which prevents any undesirable movement of the shaft (7) compression spring which would result in changing the setting theoretically determined by the relative position of the toothed wheel (19) and the toothed surface (20).

La figure 4 montre des exemples de courbes relevées avec un système selon l'invention, en utilisant des associations de ressorts de traction et de compression différentes, lorsque la tension est minimale (groupe inférieur de courbes) et maximale (groupe supérieur). Les valeurs en abscisse correspondent à l'angle de basculement, allant de 0° à 25°, alors que les valeurs ou ordonnées sont les couples résistants du dossier allant de 25000 à 260 000 N/mm. Les courbes sont presque linéaires, avec une pente qui laisse augurer le bon équilibrage à chaque position.FIG. 4 shows examples of curves taken with a system according to the invention, using different combinations of tension and compression springs, when the tension is minimum (lower group of curves) and maximum (higher group). The values on the abscissa correspond to the tilting angle, ranging from 0 ° to 25 °, while the values or ordinates are the resistant torques of the file going from 25000 to 260 000 N / mm. The curves are almost linear, with a slope that augurs the right balance at each position.

La caractéristique majeure de l'invention est l'association d'un ressort de compression (2) et d'un ressort de traction (3) à la place d'un ressort de torsion tel que classiquement utilisé dans ce type de mécanisme. Le moyen de commande proprement dit, dont un exemple a été exposé auparavant, ne doit pas être considéré comme limitatif de cette invention. The major feature of the invention is the combination of a compression spring (2) and a tension spring (3) in place of a torsion spring as conventionally used in this type of mechanism. The actual control means, an example of which has been previously discussed, should not be considered as limiting of this invention.

Claims

REVENDICATIONS 1. Mécanisme de réglage synchronisé de la tension de basculement d'un siège, le dossier étant monté pivotant sur un support placé sous l'assise du siège surmontant la base, des moyens de rappel ajustables étant interposés entre ledit support et le dossier, caractérisé en ce qu'il comporte :1. Synchronized adjustment mechanism of the tilting tension of a seat, the backrest being pivotally mounted on a support placed under the seat cushion above the base, adjustable return means being interposed between said support and the backrest, characterized in that it comprises: - au moins un ressort de traction précontraint à au moins une tension minimale prédéfinie ;at least one tension spring prestressed to at least one predetermined minimum tension; - au moins un ressort de compression dont la course est réglable ; - lesdits ressorts exerçant une action conjuguée sur le dossier visant à s'opposer à son basculement.at least one compression spring whose stroke is adjustable; - said springs exercising a combined action on the file to oppose its changeover. 2. Mécanisme de réglage synchronisé selon la revendication précédente, caractérisé en ce que les ressorts de compression et de traction sont disposés de part et d'autre de l'axe de basculement du dossier. 3 . Mécanisme de réglage synchronisé selon l'une des revendications précédentes, caractérisé en ce que l'une des extrémités de chaque ressort est montée sur le support de l'assise libre en rotation d'axe parallèle à l'axe de basculement du dossier, l'autre extrémité étant reliée à une platine solidaire de l'arbre de basculement du dossier. 4. Mécanisme de réglage synchronisé de la tension de basculement d'un dossier d'un siège, ledit dossier étant monté pivotant sur un support placé sous l'assise du siège surmontant la base, des moyens de rappel ajustables étant interposés entre ledit support et le dossier, caractérisé en ce qu'il comporte :2. Synchronized adjustment mechanism according to the preceding claim, characterized in that the compression springs and traction are arranged on either side of the axis of tilting of the backrest. 3. Synchronized adjustment mechanism according to one of the preceding claims, characterized in that one of the ends of each spring is mounted on the support of the free seat in rotation with an axis parallel to the axis of tilting of the backrest. other end being connected to a plate integral with the tilting shaft of the folder. 4. Synchronized adjustment mechanism of the tilting tension of a backrest of a seat, said backrest being pivotally mounted on a support placed under the seat of the seat surmounting the base, adjustable return means being interposed between said support and the file, characterized in that it comprises: - au moins un ressort de traction précontraint à au moins une tension minimale prédéfinie ;at least one tension spring prestressed to at least one predetermined minimum tension; - au moins un ressort de compression dont la course est réglable ;at least one compression spring whose stroke is adjustable; - lesdits ressorts étant disposés de part et d'autre de l'axe de basculement du dossier en vue d'exercer une action conjuguée sur le dossier visant à s'opposer à son basculement ; - l'une des extrémités de chaque ressort étant montée sur le support de l'assise libre en rotation d'axe parallèle à l'axe de basculement du dossier, l'autre extrémité étant reliée à une platine solidaire de l'arbre de basculement du dossier.- said springs being disposed on either side of the axis of tilting of the folder to exert a combined action on the file to oppose its tilting; one of the ends of each spring being mounted on the support of the free seat in rotation of axis parallel to the axis of tilting of the backrest, the other end being connected to a plate integral with the tilting shaft folder. 5. Mécanisme de réglage synchronisé selon la revendication précédente, caractérisé en ce que le support comporte un berceau muni d'un fond et de parois latérales, un arbre monté rotatif dans lesdites parois latérales séparant ledit berceau en deux espaces recevant respectivement au moins un ressort de compression et au moins un ressort de traction, ledit arbre étant surmonté de la platine et supportant au moins un bras de dossier basculant.5. Synchronized adjustment mechanism according to the preceding claim, characterized in that the support comprises a cradle provided with a bottom and side walls, a rotatably mounted shaft in said side walls separating said cradle into two spaces respectively receiving at least one spring compression and at least one tension spring, said shaft being surmounted by the plate and supporting at least one tilting backrest arm. 6. Mécanisme de réglage synchronisé selon l'une des revendications 3 à 5, caractérisé en ce que les ressorts sont orientés de telle sorte que leurs axes sont dans au moins un plan perpendiculaire à l'axe de basculement du dossier.6. Synchronized adjustment mechanism according to one of claims 3 to 5, characterized in that the springs are oriented so that their axes are in at least one plane perpendicular to the axis of tilting of the backrest. 7 . Mécanisme de réglage synchronisé selon l'une quelconque des revendications précédentes, caractérisé en ce que chaque ressort de compression est monté sur un arbre télescopique comportant deux têtes d'extrémité sur lesquelles s'appuient les extrémités axiales du ressort.7. Synchronized adjustment mechanism according to any one of the preceding claims, characterized in that each compression spring is mounted on a telescopic shaft having two end heads on which the axial ends of the spring are supported. 8. Mécanisme de réglage synchronisé selon la revendication précédente, caractérisé en ce que l'une des têtes est articulée au berceau, l'autre tête s'appuyant contre une surface incurvée de la platine le long de laquelle elle peut se déplacer selon un trajet situé dans un plan perpendiculaire à l'axe de basculement en vue de modifier la longueur de l'arbre.8. Synchronized adjustment mechanism according to the preceding claim, characterized in that one of the heads is articulated to the cradle, the other head resting against a curved surface of the plate along which it can move in a path located in a plane perpendicular to the tilt axis to modify the length of the shaft. 9. Mécanisme de réglage synchronisé de la tension de basculement d'un siège, le dossier étant monté pivotant sur un support placé sous l'assise du siège surmontant le pied, des moyens de rappel ajustables étant interposés entre ledit support et le dossier, caractérisé en ce qu'il comporte : - au moins un ressort de traction précontraint à au moins une tension minimale prédéfinie ;9. Synchronized adjustment mechanism of the tilting tension of a seat, the backrest being pivotally mounted on a support placed under the seat cushion above the foot, adjustable return means being interposed between said support and the backrest, characterized in that it comprises: at least one tension spring prestressed to at least one predefined minimum tension; - au moins un ressort de compression dont la course est réglable et monté sur un arbre télescopique comportant deux têtes d'extrémité sur lesquelles s'appuient les extrémités axiales du ressort; - lesdits ressorts étant disposés de part et d'autre de l'axe de basculement du dossier en vue d'exercer une action conjuguée sur le dossier visant à s'opposer à son basculement ;- At least one compression spring whose stroke is adjustable and mounted on a telescopic shaft having two end heads on which the axial ends of the spring are supported; - said springs being disposed on either side of the axis of tilting of the folder to exert a combined action on the file to oppose its tilting; - l'une des extrémités de chaque ressort étant montée sur le support de l'assise libre en rotation d'axe parallèle à l'axe de basculement du dossier, l'autre extrémité étant reliée à une platine solidaire de l'arbre de basculement du dossier ;one of the ends of each spring being mounted on the support of the free seat in rotation of axis parallel to the axis of tilting of the backrest, the other end being connected to a plate integral with the tilting shaft folder ; - la tête du ressort de compression située du côté de la platine s'appuyant contre une surface incurvée de la platine le long de laquelle elle peut se déplacer selon un trajet situé dans un plan perpendiculaire à l'axe de basculement en vue de modifier la longueur de l'arbre.- the head of the compression spring located on the side of the plate bearing against a curved surface of the plate along which it can move along a path in a plane perpendicular to the axis of tilting to modify the length of the tree. 10. Mécanisme de réglage synchronisé selon l'une des revendications 8 et 9, caractérisé en ce que ladite surface incurvée est dotée de murets latéraux de manière à constituer une glissière de guidage pour une excroissance de la tête se déplaçant entre lesdits murets.10. Synchronized adjustment mechanism according to one of claims 8 and 9, characterized in that said curved surface is provided with side walls of so as to constitute a guide rail for a protrusion of the head moving between said walls. 1 1 .Mécanisme de réglage synchronisé selon la revendication précédente, caractérisé en ce que la surface incurvée, la tête s'y appliquant et les murets sont munis d'un crantage.1 1. Synchronized adjustment mechanism according to the preceding claim, characterized in that the curved surface, the head applied thereto and the walls are provided with a notch. 12. Mécanisme de réglage synchronisé de la tension de basculement d'un dossier d'un siège, ledit dossier étant monté pivotant sur un support placé sous l'assise du siège surmontant la base, des moyens de rappel ajustables étant interposés entre ledit support et le dossier, caractérisé en ce qu'il comporte : - au moins un ressort de traction précontraint à au moins une tension minimale prédéfinie ;12. Synchronized adjustment mechanism of the tilting tension of a backrest of a seat, said backrest being pivotally mounted on a support placed under the seat cushion above the base, adjustable return means being interposed between said support and the backrest, characterized in that it comprises: at least one tension spring prestressed to at least one predetermined minimum tension; - au moins un ressort de compression dont la course est réglable et monté sur un arbre télescopique comportant deux têtes d'extrémité sur lesquelles s'appuient les extrémités axiales du ressort; - lesdits ressorts étant disposés de part et d'autre de l'axe de basculement du dossier en vue d'exercer une action conjuguée sur le dossier visant à s'opposer à son basculement ;- At least one compression spring whose stroke is adjustable and mounted on a telescopic shaft having two end heads on which the axial ends of the spring are supported; - said springs being disposed on either side of the axis of tilting of the folder to exert a combined action on the file to oppose its tilting; - l'une des extrémités de chaque ressort étant montée sur le support de l'assise libre en rotation d'axe parallèle à l'axe de basculement du dossier, l'autre extrémité étant reliée à une platine solidaire de l'arbre de basculement du dossier ;one of the ends of each spring being mounted on the support of the free seat in rotation of axis parallel to the axis of tilting of the backrest, the other end being connected to a plate integral with the tilting shaft folder ; - la tête du ressort de compression située du côté de la platine s'appuyant contre une surface incurvée de la platine le long de laquelle elle peut se déplacer selon un trajet situé dans un plan perpendiculaire à l'axe de basculement en vue de modifier la longueur de l'arbre, ladite surface incurvée étant dotée de murets latéraux de manière à constituer une glissière de guidage pour une excroissance de la tête se déplaçant entre lesdits murets ;- the head of the compression spring located on the side of the plate bearing against a curved surface of the plate along which it can move along a path in a plane perpendicular to the axis of tilting to modify the length of the shaft, said curved surface being provided with side walls so as to constitute a guide rail for a protrusion of the head moving between said walls; - la surface incurvée, la tête s'y appliquant et les murets étant munis d'un crantage.- The curved surface, the head applied and the walls being provided with a notch. 1 3 Mécanisme de réglage synchronisé selon l'une quelconque des revendications 8 à 12, caractérisé en ce que la tête s'appliquant sur la surface incurvée de la platine comporte un ergot latéral coopérant avec les deux branches parallèles d'une fourche mobile en rotation et dont le déplacement entraîne la tête le long de la surface incurvée de la platine, l'ergot étant libre en translation à l'intérieur des branches. 1 3 Synchronized adjustment mechanism according to any one of claims 8 to 12, characterized in that the head applying to the curved surface of the plate comprises a lateral lug cooperating with the two parallel branches of a rotating fork and whose displacement drives the head along the curved surface of the plate, the pin being free in translation inside the branches. 4. Mécanisme de réglage synchronisé selon la revendication précédente, caractérisé en ce que la fourche est solidaire d'un organe comportant une piste en arc de cercle dentée engrenant avec une roue dentée disposée sur un arbre commandé en rotation par une molette. 4. Synchronized adjustment mechanism according to the preceding claim, characterized in that the fork is secured to a member having a toothed arcuate track meshing with a toothed wheel disposed on a shaft rotated by a wheel.
PCT/FR2007/000420 2007-03-08 2007-03-08 Mechanism for the synchronous adjustment of the tilting tension of a seat Ceased WO2008110669A1 (en)

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PCT/FR2007/000420 WO2008110669A1 (en) 2007-03-08 2007-03-08 Mechanism for the synchronous adjustment of the tilting tension of a seat
EP07731117A EP2129263A1 (en) 2007-03-08 2007-03-08 Mechanism for the synchronous adjustment of the tilting tension of a seat

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PCT/FR2007/000420 WO2008110669A1 (en) 2007-03-08 2007-03-08 Mechanism for the synchronous adjustment of the tilting tension of a seat

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2070445A1 (en) * 2007-12-11 2009-06-17 Sedus Stoll AG Device to adjust the spring force of an office chair
WO2009127862A1 (en) * 2008-04-17 2009-10-22 Simclar Seating Technologies Limited Chair back tilt tensioning
WO2010103554A1 (en) * 2009-03-10 2010-09-16 Effe Tre S.R.L. Support device of a chair with tilting backrest
WO2018073222A1 (en) * 2016-10-18 2018-04-26 Vitra Patente Ag Synchronous chair mechanism and chair having one such
WO2022213591A1 (en) * 2021-04-06 2022-10-13 恒林家居股份有限公司 Chair and tray thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2704292A1 (en) * 1977-02-02 1978-08-03 Fiand F Gmbh Bearing unit for fastening seats to stands - has protruding backrest support allowing subsequent fastening of backrest
JPH0568620A (en) * 1991-09-11 1993-03-23 Daiwa Rakuda Kogyo Kk Chair
JPH05293022A (en) * 1992-04-21 1993-11-09 Meekoo Kogyo Kk Office chair
WO1997022283A1 (en) * 1995-12-18 1997-06-26 Peter Opsvik A/S A device for adjusting the tilting resistance of a chair seat
DE20010356U1 (en) * 2000-06-14 2000-09-14 Josef Steltemeier GmbH, 59557 Lippstadt Seating

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2704292A1 (en) * 1977-02-02 1978-08-03 Fiand F Gmbh Bearing unit for fastening seats to stands - has protruding backrest support allowing subsequent fastening of backrest
JPH0568620A (en) * 1991-09-11 1993-03-23 Daiwa Rakuda Kogyo Kk Chair
JPH05293022A (en) * 1992-04-21 1993-11-09 Meekoo Kogyo Kk Office chair
WO1997022283A1 (en) * 1995-12-18 1997-06-26 Peter Opsvik A/S A device for adjusting the tilting resistance of a chair seat
DE20010356U1 (en) * 2000-06-14 2000-09-14 Josef Steltemeier GmbH, 59557 Lippstadt Seating

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2070445A1 (en) * 2007-12-11 2009-06-17 Sedus Stoll AG Device to adjust the spring force of an office chair
WO2009127862A1 (en) * 2008-04-17 2009-10-22 Simclar Seating Technologies Limited Chair back tilt tensioning
WO2010103554A1 (en) * 2009-03-10 2010-09-16 Effe Tre S.R.L. Support device of a chair with tilting backrest
WO2018073222A1 (en) * 2016-10-18 2018-04-26 Vitra Patente Ag Synchronous chair mechanism and chair having one such
US11160377B2 (en) 2016-10-18 2021-11-02 Vitra Ag Synchronous chair mechanism and chair having same
WO2022213591A1 (en) * 2021-04-06 2022-10-13 恒林家居股份有限公司 Chair and tray thereof

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