EP0624328A1 - Device for locking the tiltable seat of an office chair - Google Patents

Device for locking the tiltable seat of an office chair Download PDF

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Publication number
EP0624328A1
EP0624328A1 EP94830101A EP94830101A EP0624328A1 EP 0624328 A1 EP0624328 A1 EP 0624328A1 EP 94830101 A EP94830101 A EP 94830101A EP 94830101 A EP94830101 A EP 94830101A EP 0624328 A1 EP0624328 A1 EP 0624328A1
Authority
EP
European Patent Office
Prior art keywords
tie rod
sphere
lever
blades
locking
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.)
Withdrawn
Application number
EP94830101A
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German (de)
French (fr)
Inventor
Sergio Moreschi
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.)
Cofemo SpA
Original Assignee
Cofemo SpA
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Filing date
Publication date
Application filed by Cofemo SpA filed Critical Cofemo SpA
Publication of EP0624328A1 publication Critical patent/EP0624328A1/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Withdrawn legal-status Critical Current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
    • A47C1/00—Chairs adapted for special purposes
    • A47C1/02—Reclining or easy chairs
    • A47C1/022—Reclining or easy chairs having independently-adjustable supporting parts
    • A47C1/024—Reclining or easy chairs having independently-adjustable supporting parts the parts, being the back-rest, or the back-rest and seat unit, having adjustable and lockable inclination
    • A47C1/027—Reclining or easy chairs having independently-adjustable supporting parts the parts, being the back-rest, or the back-rest and seat unit, having adjustable and lockable inclination by means of clamps or friction locking members

Definitions

  • the utility model in question relates in general to office chairs with a tilting seat, and more particularly to a device for locking / unlocking the seat of these chairs.
  • the office chairs or armchairs can be made up of seat, backrest, fixed to a tilting support on a fixed element or relative to this fixed element supported by an upright or a support column.
  • the oscillations of this support, and therefore of the seat, can be prohibited by a blocking device located between the tilting support and the central body.
  • the central body has parallel blades and the locking / unlocking device is supported by the tilting support and intended to engage the latter to the central body by a stacking blocking of these blades.
  • the device normally comprises a tie rod which crosses these blades and which is displaced axially and transversely with respect to the tilting support from the locking position to the unlocking position by means of a support element against the opposite sides of the stacking of slides; a spring which tends to hold the lever normally in the locked position, and an operating lever which acts on the tie rod opposing this spring to move it into the unlocked position.
  • This invention aims, moreover, to provide a locking / unlocking device for tilting seats obtained through a new arrangement and combination of elements, with a simpler and more economical design and easier movement.
  • the device in question is practically in accordance with claim 1 which will follow. It allows to: - momentarily unlock the swing, in addition to permanent locking and unlocking, with automatic return blocked after a straightening of the seat; and - use a simple-form operating lever that can be extended forward near the tilting support for easier manual access.
  • Fig. 1 shows a plan view of a support assembly for a tilting seat complete with a locking / unlocking device
  • Fig. 2 shows a cross section of the assembly of FIG. 1 at the locking / unlocking device.
  • the reference 10 indicates a tilting support relative to the body which is equipped with several stacked blades 11.
  • the tilting support 10 supports a seat for chairs and the like which can be locked / unlocked on this stack of blades 11 at by means of a locking / unlocking device 12 which can be actuated manually.
  • This device 12 mainly comprises a fixed tie rod 13, a locking spring 14 and an operating lever 15.
  • the tie rod 13 is oriented transversely to the support 10, crosses the blades 11, being guided, on one side, in a socket 16 which rests against one side of the stack of blades 11 and which can be moved in a seat 10 ′ obtained in the tilting support 10 and, from opposite side, in a reaction sleeve 17 fixed to the tilting support 10 and provided with a bottom flange 17 'which rests against the opposite side of the stack of blades 11.
  • the tie rod 13 has on one side a nut 18 which prevents the extraction of the guide elements 16, 17 and on the other side it is provided with a head 19 turned towards the operating lever 15 and which is moves axially from the locking position to the unlocking position on the blades 11.
  • the locking spring 14 is located, precompressed, inside the sleeve 17, between the head 19 of the tie rod 13 and the bottom flange 17 'of the sleeve.
  • the spring 14 thus acts by normally moving the tie rod towards the lever 15 and keeping the sleeve 16 engaged against the stack of blades 11 which are thus blocked against the bottom 17 ′ of the reaction rod 17.
  • the operating lever 15 is located next to the tilting support 10 and comprises a control arm 15 ′ extending orthogonally to the axis of the tie rod 13 at a certain distance from the head 19 of the latter, and a grip arm 15 '' angular with respect to the control arm 15 '.
  • This control arm 15 of the lever 15 passes through the sleeve 17 and can rotate on its axis.
  • a sphere 20 in the center of a guide ring 21 fixed or integral with the reaction sleeve 17, this sphere 20 acting as a member for transmitting the commands from the lever to the tie rod .
  • the control arm 15 ′ of the lever 15 has a radial cavity 22 which defines a cam which interacts with the sphere 20 to establish the locking / unlocking positions of the device.
  • the cavity 22 when the cavity 22 is oriented towards the sphere 20, it houses part of the sphere - see FIG. 2 - which allows the tie rod 13, by the action of the spring 14, to move towards the sphere and maintain the blocking position at which the blades are compressed between the elements 16 and 17.
  • the release may be momentary and unstable if the lever arm 15 '' of the lever is moved upward, in the direction of the arrow S in FIG. 2, so as to leave the cavity 22 partially in correspondence with the sphere.
  • Such a reduced displacement can be delimited by a stop tooth 23 on the arm 15 '' of the lever 15, which interacts with a stop on the reaction sleeve.
  • the unstable condition between the sphere 20 and the cavity 22, and the reaction action of the spring 14 will allow the device to automatically return to the locked position once the manual control ( S ) on the lever is removed.

Abstract

The utility model in question relates to a locking and unlocking device for chairs in which the seat is fixed to a support (10) that tilts on a fixed component and relative to this fixed component, which has a row of parallel plates (11). The device comprises a rigid tie (13) which extends through the plates (11) and is shifted axially from the locked position to the unlocked position by means of a lever and with the help of a spring (14) which normally tends to keep the tie (13) in the locked position. The operating lever (14) acts on the tie (13) through an intermediate ball (20) and has a radial cavity (22) into which part of the ball (20) fits in order to define the locked position of the tie (13). <IMAGE>

Description

Le modèle utilitaire en question concerne en général les chaises de bureau à assise basculante, et plus en particulier un dispositif de blocage/déblocage de l'assise de ces chaises.The utility model in question relates in general to office chairs with a tilting seat, and more particularly to a device for locking / unlocking the seat of these chairs.

Les chaises ou les fauteuils de bureau peuvent être constituées d'assise, siège-dossier, fixée à un support basculant sur un élément fixe ou par rapport à cet élément fixe supporté par un montant ou une colonne d'appui. Les oscillations de ce support, et donc du siège, peuvent être interdites par un dispositif de blocage situé entre le support basculant et le corps central.The office chairs or armchairs can be made up of seat, backrest, fixed to a tilting support on a fixed element or relative to this fixed element supported by an upright or a support column. The oscillations of this support, and therefore of the seat, can be prohibited by a blocking device located between the tilting support and the central body.

Dans une exécution diffusée, le corps central présente des lames parallèles et le dispositif de blocage/déblocage est supporté par le support basculant et destiné à engager ce dernier au corps central par un blocage à empilage de ces lames. Le dispositif comprend normalement un tirant qui traverse ces lames et que l'on déplace axialement et transversalement par rapport au support basculant de la position de blocage à la position de déblocage au moyen d'un élément d'appui contre les côtés opposés de l'empilage de lames; un ressort qui tend à maintenir le levier normalement dans la position de blocage, et un levier de manoeuvre qui agit sur le tirant opposant à ce ressort pour le déplacer dans la position de déblocage.In a diffused embodiment, the central body has parallel blades and the locking / unlocking device is supported by the tilting support and intended to engage the latter to the central body by a stacking blocking of these blades. The device normally comprises a tie rod which crosses these blades and which is displaced axially and transversely with respect to the tilting support from the locking position to the unlocking position by means of a support element against the opposite sides of the stacking of slides; a spring which tends to hold the lever normally in the locked position, and an operating lever which acts on the tie rod opposing this spring to move it into the unlocked position.

Plusieurs modes d'interaction entre le levier de manoeuvre et le tirant de blocage/déblocage ont été proposés. Cette invention vise, d'ailleurs, à offrir un dispositif de blocage/déblocage pour assises basculantes obtenu par l'intermédiaire d'un nouvel arrangement et combinaison d'éléments, à conception plus simple et économique et au mouvement plus aisé.Several modes of interaction between the operating lever and the locking / unlocking tie rod have been proposed. This invention aims, moreover, to provide a locking / unlocking device for tilting seats obtained through a new arrangement and combination of elements, with a simpler and more economical design and easier movement.

Le dispositif en question est pratiquement conforme à la revendication 1 qui suivra. Il permet de:
   - débloquer momentanément le balancement, outre au blocage et déblocage permanents, avec retour automatique bloqué après un redressement de l'assise; et
- utiliser un levier de manoeuvre à la forme simple et que l'on peut étendre en avant près du support basculant pour un accès manuel plus aisé.The device in question is practically in accordance with claim 1 which will follow. It allows to:
- momentarily unlock the swing, in addition to permanent locking and unlocking, with automatic return blocked after a straightening of the seat; and
- use a simple-form operating lever that can be extended forward near the tilting support for easier manual access.

Des détails supplémentaires de l'invention en question sont plus évidents dans la description faite se rapportant au plan indicatif et non limitatif ci-joint, où:
la Fig. 1 montre une vue en plan d'un ensemble de support pour assise basculante complet de dispositif de blocage/déblocage; et
la Fig. 2 montre une section transversale de l'ensemble de la Fig. 1 au niveau de dispositif de blocage/déblocage.Additional details of the invention in question are more evident in the description given relating to the indicative and non-limiting plan attached, where:
Fig. 1 shows a plan view of a support assembly for a tilting seat complete with a locking / unlocking device; and
Fig. 2 shows a cross section of the assembly of FIG. 1 at the locking / unlocking device.

Dans ces plans, la référence 10 indique un support basculant par rapport au corp qui est équipé de plusieurs lames empilées 11. Le support basculant 10 supporte une assise pour chaises et similaires que l'on peut bloquer/débloquer sur cet empilage de lames 11 au moyen d'un dispositif de blocage/déblocage 12 que l'on peut actionner manuellement. Ce dispositif 12 comprend principalement un tirant fixe 13, un ressort de blocage 14 et un levier de manoeuvre 15.In these plans, the reference 10 indicates a tilting support relative to the body which is equipped with several stacked blades 11. The tilting support 10 supports a seat for chairs and the like which can be locked / unlocked on this stack of blades 11 at by means of a locking / unlocking device 12 which can be actuated manually. This device 12 mainly comprises a fixed tie rod 13, a locking spring 14 and an operating lever 15.

En particulier, le tirant 13 est orienté transversalement au support 10, traverse les lames 11, étant guidé, d'un côté, dans une douille 16 qui repose contre un côté de l'empilage de lames 11 et que l'on peut déplacer dans un siège 10' obtenu dans le support basculant 10 et, du côté opposé, dans un manchon de réaction 17 fixé au support basculant 10 et muni d'une bride de fond 17' qui repose contre le côté opposé de l'empilage de lames 11.In particular, the tie rod 13 is oriented transversely to the support 10, crosses the blades 11, being guided, on one side, in a socket 16 which rests against one side of the stack of blades 11 and which can be moved in a seat 10 ′ obtained in the tilting support 10 and, from opposite side, in a reaction sleeve 17 fixed to the tilting support 10 and provided with a bottom flange 17 'which rests against the opposite side of the stack of blades 11.

Pratiquement, le tirant 13 présente sur un côté un écrou 18 qui empêche l'extraction des éléments de guide 16, 17 et sur l'autre côté il est muni d'une tête 19 tournée vers le levier de manoeuvre 15 et que l'on déplace axialement de la position de blocage à la position de déblocage sur les lames 11.In practice, the tie rod 13 has on one side a nut 18 which prevents the extraction of the guide elements 16, 17 and on the other side it is provided with a head 19 turned towards the operating lever 15 and which is moves axially from the locking position to the unlocking position on the blades 11.

Le ressort de blocage 14 se trouve, précomprimée, à l'intérieur du manchon 17, entre la tête 19 du tirant 13 et la bride de fond 17' du manchon. Le ressort 14 agit ainsi en déplaçant normalement le tirant vers le levier 15 et maintenant la douille 16 engagée contre l'empilage de lames 11 qui sont ainsi bloquées contre le fond 17' du machon de réaction 17.The locking spring 14 is located, precompressed, inside the sleeve 17, between the head 19 of the tie rod 13 and the bottom flange 17 'of the sleeve. The spring 14 thus acts by normally moving the tie rod towards the lever 15 and keeping the sleeve 16 engaged against the stack of blades 11 which are thus blocked against the bottom 17 ′ of the reaction rod 17.

Le levier de manoeuvre 15 se trouve à côté du support basculant 10 et comprend un bras de commande 15' s'étendant orthogonalement à l'axe du tirant 13 à une certaine distance de la tête 19 de ce dernier, et un bras de prise 15'' angulaire par rapport au bras de commande 15'. Ce bras de commande 15 du levier 15 traverse le manchon 17 et peut tourner sur son axe. Entre le bras de commande 15 et la tête 19 du tirant 13 est interposée une sphère 20 au centre d'un anneau de guide 21 fixé ou intégral au manchon de réaction 17, cette sphère 20 agissant comme organe de transmission des commandes du levier au tirant. Le bras de commande 15' du levier 15 dispose d'une cavité radiale 22 qui définit une camme qui interagit avec la sphère 20 pour établir les positions de blocage/déblocage du dispositif.The operating lever 15 is located next to the tilting support 10 and comprises a control arm 15 ′ extending orthogonally to the axis of the tie rod 13 at a certain distance from the head 19 of the latter, and a grip arm 15 '' angular with respect to the control arm 15 '. This control arm 15 of the lever 15 passes through the sleeve 17 and can rotate on its axis. Between the control arm 15 and the head 19 of the tie rod 13 is interposed a sphere 20 in the center of a guide ring 21 fixed or integral with the reaction sleeve 17, this sphere 20 acting as a member for transmitting the commands from the lever to the tie rod . The control arm 15 ′ of the lever 15 has a radial cavity 22 which defines a cam which interacts with the sphere 20 to establish the locking / unlocking positions of the device.

En effet, quand la cavité 22 est orientée vers la sphère 20, elle loge une partie de la sphère - voir Fig. 2 - ce qui permet au tirant 13, par l'action du ressort 14, de se déplacer vers la sphère et maintenir la position de blocage à laquelle les lames sont comprimées entre les éléments 16 et 17.In fact, when the cavity 22 is oriented towards the sphere 20, it houses part of the sphere - see FIG. 2 - which allows the tie rod 13, by the action of the spring 14, to move towards the sphere and maintain the blocking position at which the blades are compressed between the elements 16 and 17.

Par contre, une rotation du levier 15 autour de l'axe du bras de commande 15' provoque l'éloignement de la cavité 22 de la sphère 20. Cette dernière est ainsi poussée vers le tirant 13 par la surface périphérique du bras. Cela provoque un déplacement axial du tirant 13 opposé à l'action du ressort 14 et un déblocage du dispositif lorsque la douille 16 tend à s'éloigner de l'empilage de lames.On the other hand, a rotation of the lever 15 around the axis of the control arm 15 ′ causes the cavity 22 to move away from the sphere 20. The latter is thus pushed towards the tie rod 13 by the peripheral surface of the arm. This causes an axial displacement of the tie rod 13 opposite to the action of the spring 14 and an unlocking of the device when the sleeve 16 tends to move away from the stack of blades.

On peut avoir un déblocage permanent en déplaçant vers le bas, dans le sens de la flèche G dans la Fig. 2, le bras de prise 15'' du levier 15 pour éloigner complètement la cavité 22 de la sphère 20. Le déblocage peut être momentané et instable si le bras de prise 15'' du levier est déplacé vers le haut, dans le sens de la flèche S dans la Fig. 2, de manière à laisser la cavité 22 partiellement en correspondance de la sphère. Un tel déplacement réduit peut être délimité par un dent d'arrêt 23 sur le bras 15'' du levier 15, qui interagit avec une butée sur le manchon de réaction. La condition instable entre la sphère 20 et la cavité 22, et l'action de réaction du ressort 14 permettront au dispositif de retourner automatiquement dans la position de blocage une fois la commande manuelle (S) sur le levier est enlevée.You can have a permanent release by moving down in the direction of the arrow G in FIG. 2, the lever arm 15 '' of the lever 15 to completely separate the cavity 22 from the sphere 20. The release may be momentary and unstable if the lever arm 15 '' of the lever is moved upward, in the direction of the arrow S in FIG. 2, so as to leave the cavity 22 partially in correspondence with the sphere. Such a reduced displacement can be delimited by a stop tooth 23 on the arm 15 '' of the lever 15, which interacts with a stop on the reaction sleeve. The unstable condition between the sphere 20 and the cavity 22, and the reaction action of the spring 14 will allow the device to automatically return to the locked position once the manual control ( S ) on the lever is removed.

Claims (4)

Dispositif de blocage/déblocage pour chaises munies de siège fixé à un support (10) basculant sur un élément fixe et par rapport à cet élément fixe qui est équipé d'un empilage de lames parallèles (11), dispositif comprenant un tirant fixe (13) qui traverse les lames (11) et que l'on déplace axialement de la position de blocage à la position de déblocage au moyen d'éléments (16, 17) reposant contre les côtés opposés de l'empilage de lames (11), un ressort de blocage (14) qui tend normalement à maintenir le tirant (13) dans la position de blocage, et un levier de manoeuvre (15) qui agit sur le tirant (13) opposé à ce ressort (14) pour le déplacer de la position de déblocage, caractérisé par le fait que ce levier de manoeuvre (14) agit sur le tirant (13) par l'intermédiaire d'une sphère interposée (20), ce levier étant disposé d'une cavité radiale (22) où vient se loger une partie de la sphère (20) afin de définir la position de blocage du tirant (13).Locking / unlocking device for chairs fitted with a seat fixed to a support (10) tilting on a fixed element and relative to this fixed element which is equipped with a stack of parallel blades (11), device comprising a fixed tie rod (13 ) which passes through the blades (11) and which is moved axially from the locking position to the unlocking position by means of elements (16, 17) resting against the opposite sides of the stack of blades (11), a locking spring (14) which normally tends to keep the tie rod (13) in the locked position, and an operating lever (15) which acts on the tie rod (13) opposite this spring (14) to move it from the unlocking position, characterized in that this operating lever (14) acts on the tie rod (13) via an interposed sphere (20), this lever being arranged with a radial cavity (22) where comes to accommodate a part of the sphere (20) in order to define the locking position of the tie rod (13). Dispositif conforme aux revendications 1, où le tirant (13), qui traverse les lames (11), est guidé dans une douille (16) qui repose contre un côté de l'empilage de lames et qui glisse dans un siège (10') obtenu dans le support basculant, et dans un manchon de réaction (17) qui est fixé au support basculant et qui dispose d'une bride de fond (17') qui repose contre le côté opposé de l'empilage de lames (11), où le tirant (13) est équipé d'une tête (19) qui fait partie du manchon (17) et qui est en contact avec la sphère (20), où le ressort le blocage (14) est située précomprimée entre la tête (19) du tirant (13) et la bride de fond (17') du manchon (17) pour déplacer le tirant vers la sphère (20), et le levier de manoeuvre (15), déplaçant la sphère (20) vers la tête du tirant, définit la position de déblocage.Device according to claims 1, wherein the tie rod (13), which passes through the blades (11), is guided in a sleeve (16) which rests against one side of the stack of blades and which slides in a seat (10 ') obtained in the tilting support, and in a reaction sleeve (17) which is fixed to the tilting support and which has a bottom flange (17 ') which rests against the opposite side of the stack of blades (11), where the tie rod (13) is equipped with a head (19) which is part of the sleeve (17) and which is in contact with the sphere (20), where the locking spring (14) is located precompressed between the head ( 19) of the tie rod (13) and the bottom flange (17 ') of the sleeve (17) to move the tie rod towards the sphere (20), and the operating lever (15), moving the sphere (20) towards the head of the tie rod, defines the unlocking position. Dispositif conforme aux revendications 1 et 2, où le levier de manoeuvre (15) est équipé d'un bras de commande (15') placé orthogonalement à l'axe du tirant et un bras de prise (15') courbé par rapport au bras de commande, où le bras de commande (15') traverse le manchon de réaction (17) avec possibilité de rotation autour de son axe, et où la cavité radiale (222) interagissant avec la sphère (20) est obtenue sur le bras de commande (15') et l'on peut approcher ou éloigner de la sphère en tournant le levier autour de l'axe du bras de commande du levier.Device according to claims 1 and 2, in which the operating lever (15) is equipped with a control arm (15 ') placed orthogonally to the axis of the tie rod and a grip arm (15') curved relative to the arm control, where the control arm (15 ') passes through the reaction sleeve (17) with the possibility of rotation about its axis, and where the radial cavity (222) interacting with the sphere (20) is obtained on the control (15 ') and you can approach or move away from the sphere by turning the lever around the axis of the lever control arm. Dispositif conforme à la revendication 3, où on peut déplacer le levier dans un premier sens (G) et un deuxième sens (S) différement par rapport à une position de blocage où la cavité radiale loge une partie de la sphère afin de définir la position de blocage, le déplacement du levier dans le premier sens (G) comportant un éloignement complet de la cavité de la sphère afin de définir la position de déblocage permanent du dispositif, tandis que le déplacement du levier dans le deuxième sens (S) comporte l'éloignement partiel de la cavité de la sphère afin de définir un blocage momentané et instable et le retour automatique dans la position de blocage du dispositif.Device according to claim 3, in which the lever can be moved in a first direction ( G ) and a second direction ( S ) differently from a blocking position where the radial cavity houses part of the sphere in order to define the position blocking, the movement of the lever in the first direction ( G ) comprising a complete separation of the cavity from the sphere in order to define the permanent unlocking position of the device, while the movement of the lever in the second direction ( S ) partial removal of the cavity from the sphere in order to define a momentary and unstable blocking and automatic return to the blocking position of the device.
EP94830101A 1993-05-14 1994-03-04 Device for locking the tiltable seat of an office chair Withdrawn EP0624328A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITBS930035 IT231241Y1 (en) 1993-05-14 1993-05-14 LOCKING / UNLOCKING DEVICE FOR THE OSCILLATING SEAT OF OFFICE CHAIRS
ITBS930035U 1993-05-14

Publications (1)

Publication Number Publication Date
EP0624328A1 true EP0624328A1 (en) 1994-11-17

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EP94830101A Withdrawn EP0624328A1 (en) 1993-05-14 1994-03-04 Device for locking the tiltable seat of an office chair

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EP (1) EP0624328A1 (en)
CA (1) CA2118762A1 (en)
IT (1) IT231241Y1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5676425A (en) * 1996-03-19 1997-10-14 R.A.M. Machines (1990) Ltd. Releasable lock forchair control mechanism

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3409593A1 (en) * 1983-05-13 1984-11-15 Wiesner - Hager KG, Altheim Work chair
DE9211244U1 (en) * 1992-08-21 1992-10-29 Dauphin Friedrich W Gmbh

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3409593A1 (en) * 1983-05-13 1984-11-15 Wiesner - Hager KG, Altheim Work chair
DE9211244U1 (en) * 1992-08-21 1992-10-29 Dauphin Friedrich W Gmbh

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CA2118762A1 (en) 1994-11-15
ITBS930035V0 (en) 1993-05-14
ITBS930035U1 (en) 1994-11-14
IT231241Y1 (en) 1999-08-02

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