EP0382665A1 - Rocking mechanism for an office chair - Google Patents

Rocking mechanism for an office chair Download PDF

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Publication number
EP0382665A1
EP0382665A1 EP90440006A EP90440006A EP0382665A1 EP 0382665 A1 EP0382665 A1 EP 0382665A1 EP 90440006 A EP90440006 A EP 90440006A EP 90440006 A EP90440006 A EP 90440006A EP 0382665 A1 EP0382665 A1 EP 0382665A1
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EP
European Patent Office
Prior art keywords
roller
seat
faces
mechanism according
face
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.)
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Application number
EP90440006A
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German (de)
French (fr)
Inventor
Charles Heidmann
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 Strafor SA
Original Assignee
Strafor SA
Steelcase Strafor SA
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Publication date
Application filed by Strafor SA, Steelcase Strafor SA filed Critical Strafor SA
Publication of EP0382665A1 publication Critical patent/EP0382665A1/en
Withdrawn legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C3/00—Chairs characterised by structural features; Chairs or stools with rotatable or vertically-adjustable seats
    • A47C3/02—Rocking chairs
    • A47C3/025—Rocking chairs with seat, or seat and back-rest unit elastically or pivotally mounted in a rigid base frame
    • A47C3/026—Rocking chairs with seat, or seat and back-rest unit elastically or pivotally mounted in a rigid base frame with central column, e.g. rocking office chairs; Tilting chairs
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C3/00—Chairs characterised by structural features; Chairs or stools with rotatable or vertically-adjustable seats
    • A47C3/02—Rocking chairs
    • A47C3/025—Rocking chairs with seat, or seat and back-rest unit elastically or pivotally mounted in a rigid base frame
    • A47C3/0252—Rocking chairs with seat, or seat and back-rest unit elastically or pivotally mounted in a rigid base frame connected only by an elastic member positioned between seat and base frame
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C7/00—Parts, details, or accessories of chairs or stools
    • A47C7/36—Support for the head or the back
    • A47C7/40—Support for the head or the back for the back
    • A47C7/44—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame
    • A47C7/448—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame with resilient blocks

Definitions

  • the present invention relates to a new tilting mechanism for office chairs, ensuring optimum comfort although comprising a very small number of parts.
  • the invention provides a radically different solution to this problem, thanks to an extremely simple mechanism, in fact comprising only two essential parts, each of which can be produced by molding an appropriate synthetic material.
  • the invention relates to a mechanism for tilting the seat of a seat relative to a fixed base, characterized in that it consists of a first part molded from resistant and relatively elastic synthetic material, with vertical section in the shape of a lying U, the underside of this part, corresponding to the first branch of the U, being horizontal and carrying a seat mounting socket on the base, the upper face, substantially horizontal and intended to support the seat connected to the backrest having parallel slots extending from the front of said piece to the free rear edge of said face, defining a number of independent parallel strips and a second piece molded in rigid synthetic material, in the form roller, housed between the two faces of the first part and transversely to said lamellae, so that said lamellae resting on the roller, said wheel water constituting for them a support on which their rear portion can flex under the action of the weight of the user, exerted on both the seat and the backrest.
  • the roller has along its length a series of notched sections so as to have lower radii on variable portions of its periphery and on which the lamellae do not bear, so that they flex from the front edge of the upper face.
  • the distribution of said sections is such that the number of lamellae supported on the roller is always increasing from the ends of the roller towards the middle.
  • the two faces of the first part are originally molded so to be appreciably divergent, an additional part then being put in place so as to exert on the upper face a closer action towards the lower face, to bring the two faces to be substantially horizontal, but under a prestressing corresponding to the minimum weight provided by the user.
  • a rotary cam is housed between the two faces of the first part, at the rear of the roller, so as to constitute a means of adjusting the amplitude of the deflections of the slats and as a result of the tilting of the seat .
  • the system according to the invention essentially consists of a first part 1 having in vertical section ( Figure 2) the shape of an elongated and lying U, and a second part 2, having the general shape of a cylinder or roller housed between the branches of this U.
  • the part 1 has a substantially horizontal lower face 3 and preferably stiffened by vertical ribs 4, and carrying a conical sleeve 5 for assembly to the base 6 of the seat, and an upper face 7, shown here substantially horizontal, by virtue of an effect prestressing which will be explained later, this face 7 being extended by lateral pads 8, intended to support the whole of the seat 9 and of the backrest 10 (simply suggested here in broken lines).
  • the front of the lower face 3 and a large portion of the upper face are notched by parallel slots 11, defining a series of parallel strips 12.
  • the roller 2 is housed between the faces 3 and 7, transversely to these strips, which rest on a generator C, constituting a support for their deflection in the direction of the arrow F, to an extreme position 7 B , defined by stop on an adjustable cam 17.
  • the basic system therefore consists of these two parts, and works simply by this flexing effect under the weight of the subject.
  • this system is preferably associated with sophistication, and in particular with a means of selecting the number of lamellae subjected to said deflection:
  • the part 2 can consist of a roller 13 comprising along its length sections having notches such as 14 and 15: FIGS. 3 a , 3 b , 3 c , thus show sections of the part 2 made from its end of the roller 13 and towards its center, the part 2 can take several angular positions by means of a rotary adjustment lever 16.
  • the part 1 is molded with the divergent faces 3 and 7 (as illustrated in 7 A ) and a suitable piece, for example pliers or a jaw, closes face 7 towards face 3, thus maintaining it under a prestress corresponding for example to a weight of 60 to 90 kg. Under these conditions the system will only start to deform under the action of tilting.
  • the part 1 must naturally be made of a synthetic material that is both resistant and relatively elastic; on the other hand, the material used for the roller 13 must be rigid enough to serve as a support for the bending strips.

Abstract

Rocking mechanism for the seat 9 of a chair with respect to a fixed base 6, characterised in that it is composed of a first part 1 moulded from synthetic material which is strong and relatively elastic, having a vertical cross-section in the shape of a "U" laying on its side, the lower face 3 of this part, corresponding to the first arm of the U, being horizontal and carrying a pivoting socket 5 for mounting the chair on the base 6, the upper face 7, substantially horizontal and intended to support the seat 9 connected to the back 10, comprising parallel slots 11 extending from the front of the said part to the free rear edge of the said face defining a certain number of independent parallel blades 12 and a second part 2 moulded from a rigid synthetic material, in the form of a roller housed between the two faces of the first part in a direction which is transverse to that of the said blades, such that the said blades 12 resting on the roller 2, the said roller constitutes a support for them on which their rear portion can flex under the effect of the user's weight applied both on the seat and on the back. <IMAGE>

Description

La présente invention concerne un nouveau mécanisme de basculement pour les sièges de bureau, assurant un confort optimum bien que comportant un très petit nombre de pièces.The present invention relates to a new tilting mechanism for office chairs, ensuring optimum comfort although comprising a very small number of parts.

On rappelera tout d'abord que les sièges de bureau, qui doivent assurer à leur utilisateur commodité et confort, ont bénéficié au cours des années, de perfectionnements constants : après avoir été simplement pivotants et basculants dans leur ensemble, ils ont comporté des moyens de basculement différents pour l'assise et le dossier, puis ils ont comporté une combinaison de moyens tels que ceux décrits dans le brevet français n° 87.13248 de la déposante, grâce auxquels l'ensemble de l'assise et du dossier est basculant, le dossier étant lui-même flexible, et cet ensemble est monté coulissant d'avant en arrière sur une glissière, pour s'adapter à la configuration physique de l'utilisateur.First of all, it should be recalled that office chairs, which must provide their user with convenience and comfort, have benefited over the years from constant improvements: after having been simply swiveling and tilting as a whole, they have included means of different tilting for the seat and the backrest, then they included a combination of means such as those described in French patent n ° 87.13248 of the applicant, thanks to which the whole of the seat and the backrest is tilting, the backrest being itself flexible, and this assembly is slidably mounted front to back on a slide, to adapt to the physical configuration of the user.

Cette dernière combinaison, bien que procurant incontestablement les avantages recherchés, implique cependant un nombre important de pièces, aussi bien métalliques qu'en matériau synthétique, de sorte que le résultat recherché est atteint au prix d'une complication et d'un coût relativement élevés.This last combination, although indisputably providing the desired benefits, however involves a large number of parts, both metallic and synthetic material, so that the desired result is achieved at the cost of a complication and relatively high cost.

L'invention apporte à ce problème une solution radicalement différente, grâce à un mécanisme d'une extrême simplicité, ne comportant en fait que deux parties essentielles, pouvant être chacune réalisée, par moulage d'un matériau synthétique approprié.The invention provides a radically different solution to this problem, thanks to an extremely simple mechanism, in fact comprising only two essential parts, each of which can be produced by molding an appropriate synthetic material.

A cet effet, l'invention vise un mécanisme de basculement de l'assise d'un siège par rapport à un piétement fixe, caractérisé en ce qu'il se compose d'une première pièce moulée en matériau synthétique résistant et relativement élastique, à section verticale en forme de U couché, la face inférieure de cette pièce, correspondant à la première branche du U, étant horizontale et portant une douille de montage du siège sur le piétement, la face supérieure, sensiblement horizontale et destinée à supporter l'assise raccordée au dossier comportant des fentes parallèles s'étendant depuis l'avant de ladite pièce jusqu'au bord arrière libre de ladite face, en définissant un certain nombre de lamelles parallèles indépendantes et d'une seconde pièce moulée en matériau synthétique rigide, en forme de rouleau, logée entre les deux faces de la première pièce et transversalement auxdites lamelles, de sorte que, lesdites lamelles reposant sur le rouleau, ledit rouleau constituant pour elles un appui sur lequel leur portion arrière peut fléchir sous l'action du poids de l'utilisateur, exercé à la fois sur l'assise et le dossier.To this end, the invention relates to a mechanism for tilting the seat of a seat relative to a fixed base, characterized in that it consists of a first part molded from resistant and relatively elastic synthetic material, with vertical section in the shape of a lying U, the underside of this part, corresponding to the first branch of the U, being horizontal and carrying a seat mounting socket on the base, the upper face, substantially horizontal and intended to support the seat connected to the backrest having parallel slots extending from the front of said piece to the free rear edge of said face, defining a number of independent parallel strips and a second piece molded in rigid synthetic material, in the form roller, housed between the two faces of the first part and transversely to said lamellae, so that said lamellae resting on the roller, said wheel water constituting for them a support on which their rear portion can flex under the action of the weight of the user, exerted on both the seat and the backrest.

Pour optimiser encore davantage les résultats obtenus grâce à ce mécanisme, et notamment pouvoir régler les modalités de fléchissement des lamelles en fonction du poids de l'utilisateur (60-90 kg), il est prévu, selon un mode de réalisation préféré de l'invention que le rouleau comporte sur sa longueur une série de sections échancrées de manière à présenter des rayons inférieurs sur des portions variables de sa périphérie et sur lesquelles les lamelles ne prennent pas appui, de sorte qu'elles fléchissent à partir du bord avant de la face supérieure.To further optimize the results obtained with this mechanism, and in particular to be able to adjust the modalities of deflection of the slats according to the weight of the user (60-90 kg), it is provided, according to a preferred embodiment of the invention that the roller has along its length a series of notched sections so as to have lower radii on variable portions of its periphery and on which the lamellae do not bear, so that they flex from the front edge of the upper face.

Dans ce cas, pour permettre le réglage précité, des moyens sont prévus pour faire pivoter le rouleau sur lui-même, de manière à sélectionner à volonté lesdites sections et par suite le nombre de lamelles prenant appui sur lui.In this case, to allow the aforementioned adjustment, means are provided for pivoting the roller on itself, so as to select at will said sections and consequently the number of lamellae bearing on it.

Sur le plan pratique, la répartition desdites sections est telle que le nombre de lamelles prenant appui sur le rouleau est toujours croissant depuis les extrémités du rouleau vers le milieu.On a practical level, the distribution of said sections is such that the number of lamellae supported on the roller is always increasing from the ends of the roller towards the middle.

Pour que le système ne risque pas de se déformer sous le seul poids de l'utilisateur sans action de basculement, il est prévu selon une caractéristique importante de l'invention que les deux faces de la première pièce sont moulées à l'origine de manière à être sensiblement divergentes, une pièce supplémentaire étant ensuite mise en place de manière à exercer sur la face supérieure une action de rapprochement vers la face inférieure, pour amener les deux faces à être sensiblement horizontales, mais sous une précontrainte correspondant au poids minimum prévu par l'utilisateur.So that the system does not risk being deformed under the sole weight of the user without tilting action, it is provided according to an important characteristic of the invention that the two faces of the first part are originally molded so to be appreciably divergent, an additional part then being put in place so as to exert on the upper face a closer action towards the lower face, to bring the two faces to be substantially horizontal, but under a prestressing corresponding to the minimum weight provided by the user.

Il est également prévu qu'une came rotative est logée entre les deux faces de la première pièce, à l'arrière du rouleau, de manière à constituer un moyen de réglage de l'amplitude des fléchissements des lamelles et par suite du basculement du siège.It is also intended that a rotary cam is housed between the two faces of the first part, at the rear of the roller, so as to constitute a means of adjusting the amplitude of the deflections of the slats and as a result of the tilting of the seat .

On va maintenant décrire plus en détails l'invention en se référant au dessin annexé qui illustre à titre non limitatif un mode de réalisation typique, et sur lequel :

  • - la figure 1 est une vue de dessus de l'ensemble des deux pièces constituant le système selon l'invention ;
  • - la figure 2 est une coupe verticale par le plan II-II de la figure 1 ;
  • - et les figures 3a, 3b, et 3c sont des coupes du rouleau intervenant dans ce système, en divers plans transversaux répartis sur sa longueur.
The invention will now be described in more detail with reference to the appended drawing which illustrates, without limitation, a typical embodiment, and in which:
  • - Figure 1 is a top view of the assembly of the two parts constituting the system according to the invention;
  • - Figure 2 is a vertical section through the plane II-II of Figure 1;
  • - And Figures 3 a , 3 b , and 3 c are sections of the roller involved in this system, in various transverse planes distributed over its length.

En se référant aux figures 1 et 2, on voit que le système selon l'invention se compose essentiellement d'une première pièce 1 présentant en coupe verticale (figure 2) la forme d'un U allongé et couché, et d'une seconde pièce 2, ayant la forme générale d'un cylindre ou rouleau logé entre les branches de ce U.Referring to Figures 1 and 2, we see that the system according to the invention essentially consists of a first part 1 having in vertical section (Figure 2) the shape of an elongated and lying U, and a second part 2, having the general shape of a cylinder or roller housed between the branches of this U.

La pièce 1 présente une face inférieure 3 sensiblement horizontale et de préférence rigidifiée par des nervures verticales 4, et portant une douille conique 5 d'assemblage au piétement 6 du siège, et une face supérieure 7, représentée ici sensiblement horizontale, grâce à un effet de précontrainte qui sera exposé plus loin, cette face 7 se prolongeant par des patins latéraux 8, destinés à supporter l'ensemble de l'assise 9 et du dossier 10 (simplement suggéré ici en trait interrompu).The part 1 has a substantially horizontal lower face 3 and preferably stiffened by vertical ribs 4, and carrying a conical sleeve 5 for assembly to the base 6 of the seat, and an upper face 7, shown here substantially horizontal, by virtue of an effect prestressing which will be explained later, this face 7 being extended by lateral pads 8, intended to support the whole of the seat 9 and of the backrest 10 (simply suggested here in broken lines).

L'avant de la face inférieure 3 et une portion importante de la face supérieure sont entaillées par des fentes parallèles 11, définissant une série de lamelles parallèles 12.The front of the lower face 3 and a large portion of the upper face are notched by parallel slots 11, defining a series of parallel strips 12.

Le rouleau 2 est logé entre les faces 3 et 7, transversalement à ces lamelles, qui reposent sur une génératrice C, constituant un appui pour leur fléchissement dans le sens de la flèche F, jusqu'à une position extrême 7B, définie par butée sur une came réglable 17.The roller 2 is housed between the faces 3 and 7, transversely to these strips, which rest on a generator C, constituting a support for their deflection in the direction of the arrow F, to an extreme position 7 B , defined by stop on an adjustable cam 17.

Le système de base se compose donc de ces deux pièces, et fonctionne simplement par cet effet de fléchissement sous le poids du sujet.The basic system therefore consists of these two parts, and works simply by this flexing effect under the weight of the subject.

Dans la pratique toutefois, ce système est de préférence associé à des sophistications, et notamment à un moyen de sélection du nombre des lamelles soumises audit fléchissement :In practice, however, this system is preferably associated with sophistication, and in particular with a means of selecting the number of lamellae subjected to said deflection:

Ainsi, la pièce 2 peut se composer d'un rouleau 13 comportant sur sa longueur des sections présentant des échancrures telles que 14 et 15 : les figures 3a, 3b, 3c, montrent ainsi des coupes de la pièce 2 pratiquées depuis son extrêmité du rouleau 13 et vers son centre, la pièce 2 pouvant prendre plusieurs positions angulaires au moyen d'un levier de réglage rotatif 16.Thus, the part 2 can consist of a roller 13 comprising along its length sections having notches such as 14 and 15: FIGS. 3 a , 3 b , 3 c , thus show sections of the part 2 made from its end of the roller 13 and towards its center, the part 2 can take several angular positions by means of a rotary adjustment lever 16.

Le comportement du système est alors le suivant :The behavior of the system is as follows:

Toutes les lamelles reposant sur des sections du rouleau 13 ne comportant pas d'échancrures fléchiront autour du point C (figure 1). Ce sera toujours le cas des lamelles correspondant aux deux extrêmités du rouleau 13.All the lamellae resting on sections of the roller 13 not having indentations will flex around point C (FIG. 1). This will always be the case for the lamellae corresponding to the two ends of the roller 13.

Par contre, quand une lamelle sera située au-dessus d'une échancrure, elle fléchira sur toute sa longueur autour du point C′, situé à l'avant de la face 7. Elle s'enfoncera donc suivant le trajet 7C situé plus bas que 7B (figure 1). L'ensemble des lamelles subissant cette modification de fléchissement dépendra du nombre de sections échancrées 14-15 mise en jeu par la rotation du rouleau 13 ; cette modification correspondra à une concavité plus ou moins prononcée de la portion centrale de la face 7. Bien entendu, les angles de fléchissement ont été volontairement exagérées sur la figure 1, pour faciliter la compréhension de cette description. Dans la réalité, on peut situer l'ordre de grandeur général du fléchissement des lamelles à environ 10° ± 1 ou 2°, sous l'effet d'un poids de 60-90 Kg d'un sujet exerçant sur le dossier une poussée de 25 dN. Cet ordre de grandeur correspond au confort recherché pour le sujet. La limite de ce fléchissement peut d'ailleurs être modifiée par rotation de la came de butée 17.On the other hand, when a strip is located above a notch, it will flex over its entire length around the point C ′, located at the front of the face 7. It will therefore sink along the path 7 C located more lower than 7 B (Figure 1). The set of blades undergoing this deflection modification will depend on the number of indented sections 14-15 brought into play by the rotation of the roller 13; this modification will correspond to a more or less pronounced concavity of the central portion of the face 7. Of course, the angles of deflection have been deliberately exaggerated in FIG. 1, to facilitate understanding of this description. In reality, we can locate the general order of magnitude of the deflection of the slats at around 10 ° ± 1 or 2 °, under the effect of a weight of 60-90 kg of a subject exerting on the backrest 25 dN. This order of magnitude corresponds to the comfort sought for the subject. The limit of this deflection can moreover be modified by rotation of the stop cam 17.

Enfin, pour éviter que la déformation des lamelles ne se produise pour un poids relativement faible, il est prévu de soumettre la face supérieure 7 à une précontrainte : la pièce 1 est moulée avec les faces 3 et 7 divergentes (comme illustré en 7A) et une pièce appropriée, par exemple une pince ou une machoire referme la face 7 vers la face 3 en la maintenant ainsi sous une précontrainte correspondant par exemple à un poids de 60 à 90 kg. Dans ces conditions le système ne commencera à se déformer réellement que sous l'action de basculement.Finally, to prevent the deformation of the lamellae from occurring for a relatively low weight, provision is made to subject the upper face 7 to a prestress: the part 1 is molded with the divergent faces 3 and 7 (as illustrated in 7 A ) and a suitable piece, for example pliers or a jaw, closes face 7 towards face 3, thus maintaining it under a prestress corresponding for example to a weight of 60 to 90 kg. Under these conditions the system will only start to deform under the action of tilting.

Pour se comporter de cette manière, la pièce 1 doit naturellement être réalisée en un matériau synthétique à la fois résistant et relativement élastique ; d'autre part, le matériau utilisé pour le rouleau 13 doit être suffisamment rigide pour servir d'appui aux lamelles en flexion.To behave in this way, the part 1 must naturally be made of a synthetic material that is both resistant and relatively elastic; on the other hand, the material used for the roller 13 must be rigid enough to serve as a support for the bending strips.

Claims (6)

1. Mécanisme de basculement de l'assise 9 d'un siège par rapport à un piétement fixe 6, caractérisé en ce qu'il se compose d'une première pièce 1 moulée en matériau synthétique résistant et relativement élastique, à section verticale en forme de U couché, la face inférieure 3 de cette pièce, correspondant à la première branche du U, étant horizontale et portant une douille de montage 5 pivotante du siège sur le piétement 6, la face supérieure 7, sensiblement horizontale et destinée à supporter l'assise 9 raccordée au dossier 10 comportant des fentes parallèles 11 s'étendant depuis l'avant de ladite pièce jusqu'au bord arrière libre de ladite face, en définissant un certain nombre de lamelles 12 parallèles indépendantes et d'une seconde pièce 2 moulée en matériau synthétique rigide, en forme de rouleau, logée entre les deux faces de la première pièce et transversalement auxdites lamelles, de sorte que, lesdites lamelles 12 reposant sur le rouleau 2, ledit rouleau constitue pour elles un appui sur lequel leur portion arrière peut fléchir sous l'action du poids de l'utilisateur, exercé à la fois sur l'assise et le dossier.1. Mechanism for tilting the seat 9 of a seat with respect to a fixed base 6, characterized in that it consists of a first part 1 molded from resistant and relatively elastic synthetic material, with vertical section in shape of lying U, the underside 3 of this piece, corresponding to the first branch of the U, being horizontal and carrying a mounting sleeve 5 pivoting of the seat on the base 6, the upper face 7, substantially horizontal and intended to support the seat 9 connected to the back 10 having parallel slots 11 extending from the front of said piece to the free rear edge of said face, defining a number of independent parallel strips 12 and a second piece 2 molded in rigid synthetic material, in the form of a roll, housed between the two faces of the first part and transversely to said strips, so that said strips 12 resting on the roll 2, said roller constitutes for them a support on which their rear portion can flex under the action of the weight of the user, exerted on both the seat and the backrest. 2. Mécanisme selon la revendication 1, caractérisé en ce que le rouleau 2 comporte sur sa longueur une série de sections échancrées 14,15 de manière à présenter des rayons inférieurs sur des portions variables de sa périphérie et sur lesquelles les lamelles ne prennent pas appui, de sorte qu'elles fléchissent à partir du bord avant de la face supérieure.2. Mechanism according to claim 1, characterized in that the roller 2 has along its length a series of indented sections 14,15 so as to have lower radii on variable portions of its periphery and on which the lamellae are not supported , so that they flex from the front edge of the upper side. 3. Mécanisme selon la revendication 2, caractérisé en ce que des moyens sont prévus pour faire pivoter le rouleau sur lui-même, de manière à sélectionner à volonté lesdites sections et par suite le nombre de lamelles prenant appui sur lui.3. Mechanism according to claim 2, characterized in that means are provided for pivoting the roller on itself, so as to select at will said sections and consequently the number of lamellae bearing on it. 4. Mécanisme selon les revendications 2 et 3, caractérisé en ce que la répartition desdites sections est telle que le nombre de lamelles prenant appui sur le rouleau est toujours croissant depuis les extrémités du rouleau vers le milieu, lesquelles ne comportent pas d'échancrures.4. Mechanism according to claims 2 and 3, characterized in that the distribution of said sections is such that the number of lamellae bearing on the roller is always increasing from the ends of the roller towards the middle, which do not have indentations. 5. Mécanisme selon les revendications 1 à 4, caractérisé en ce que les deux faces 3,7 de la première pièce sont moulées à l'origine de manière à être sensiblement divergentes, une pièce supplémentaire étant ensuite mise ne place de manière à exercer sur la face supérieure une action de rapprochement vers la face inférieure, pour amener les deux faces à être sensiblement horizontales, mais sous une précontrainte correspondant au poids prévu par l'utilisateur.5. Mechanism according to claims 1 to 4, characterized in that the two faces 3,7 of the first part are originally molded so as to be substantially divergent, an additional part being then placed so as to exert on the upper face an approach action towards the lower face, to cause the two faces to be substantially horizontal, but under a prestress corresponding to the weight provided by the user. 6. Mécanisme selon l'une quelconque des revendications précédentes, caractérisées en ce qu'une came rotative est logée entre les deux faces de la première pièce, à l'arrière du rouleau, de manière à constituer un moyen de réglage de l'amplitude ou un blocage des fléchissements des lamelles et par suite du basculement du siège.6. Mechanism according to any one of the preceding claims, characterized in that a rotary cam is housed between the two faces of the first part, at the rear of the roller, so as to constitute a means for adjusting the amplitude or a blocking of the deflections of the slats and as a result of the tilting of the seat.
EP90440006A 1989-02-10 1990-01-24 Rocking mechanism for an office chair Withdrawn EP0382665A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8901935A FR2642945A1 (en) 1989-02-10 1989-02-10 TILT MECHANISM FOR OFFICE SEAT
FR8901935 1989-02-10

Publications (1)

Publication Number Publication Date
EP0382665A1 true EP0382665A1 (en) 1990-08-16

Family

ID=9378796

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90440006A Withdrawn EP0382665A1 (en) 1989-02-10 1990-01-24 Rocking mechanism for an office chair

Country Status (4)

Country Link
EP (1) EP0382665A1 (en)
CA (1) CA2009513A1 (en)
FR (1) FR2642945A1 (en)
PT (1) PT93105A (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3740792A (en) * 1971-04-01 1973-06-26 P Werner Resilient hinging device for chairs and the like
US4411468A (en) * 1981-03-05 1983-10-25 Homecrest Industries Incorporated Rocking chair
EP0242433A2 (en) * 1986-04-21 1987-10-28 Mauser Waldeck AG Chair having a resiliently tiltable seat and back-rest
US4790600A (en) * 1987-01-16 1988-12-13 J. G. Furniture Systems, Inc. Task chair

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3740792A (en) * 1971-04-01 1973-06-26 P Werner Resilient hinging device for chairs and the like
US4411468A (en) * 1981-03-05 1983-10-25 Homecrest Industries Incorporated Rocking chair
EP0242433A2 (en) * 1986-04-21 1987-10-28 Mauser Waldeck AG Chair having a resiliently tiltable seat and back-rest
US4790600A (en) * 1987-01-16 1988-12-13 J. G. Furniture Systems, Inc. Task chair

Also Published As

Publication number Publication date
PT93105A (en) 1991-10-15
CA2009513A1 (en) 1990-08-10
FR2642945A1 (en) 1990-08-17

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