EP0609782B1 - Siège, notamment siège de travail - Google Patents

Siège, notamment siège de travail Download PDF

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Publication number
EP0609782B1
EP0609782B1 EP94101245A EP94101245A EP0609782B1 EP 0609782 B1 EP0609782 B1 EP 0609782B1 EP 94101245 A EP94101245 A EP 94101245A EP 94101245 A EP94101245 A EP 94101245A EP 0609782 B1 EP0609782 B1 EP 0609782B1
Authority
EP
European Patent Office
Prior art keywords
seat
support
chair
chair according
back support
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.)
Expired - Lifetime
Application number
EP94101245A
Other languages
German (de)
English (en)
Other versions
EP0609782A1 (fr
Inventor
Hermann Bock
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.)
Martin Bock Kunststoffverarbeitung
Original Assignee
Martin Bock Kunststoffverarbeitung
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 Martin Bock Kunststoffverarbeitung filed Critical Martin Bock Kunststoffverarbeitung
Publication of EP0609782A1 publication Critical patent/EP0609782A1/fr
Application granted granted Critical
Publication of EP0609782B1 publication Critical patent/EP0609782B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • A47C1/022—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
    • 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
    • A47C7/54—Supports for the arms
    • 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
    • A47C1/025—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 a rack-and-pinion or like gearing mechanism
    • 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
    • A47C7/441—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame with adjustable elasticity
    • 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
    • A47C7/443—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame with coil springs

Definitions

  • the invention relates to seating and in particular an office chair with the features specified in the preamble of claim 1.
  • Such seating is known from document US-A-4,561,693.
  • Seating furniture of this type is known in a wide variety of embodiments.
  • such seating furniture In order to adapt to the body stature of the person using the chair, particularly in office chairs, such seating furniture has various adjustment options, the most important adjustment functions being, on the one hand, the height adjustment of the seat surface and, on the other hand, the inclination adjustment of the backrest. It must be ensured that the adjustable parts are properly and stably locked.
  • Another aspect is the possibility of optionally attaching armrests to the seating furniture. These should be attachable with the least possible design and assembly effort.
  • An office chair is known from EP-A-0 417 518, in which the seat plate is mounted on a front support plate and a rear support plate. The latter in turn sits on a leg spring, which is fixed on the support column of the office chair and ensures a resilient design of the seat plate.
  • the rear support plate is provided with a support surface for a backrest protruding at an obtuse angle, it being possible for the connection between the support surface and the backrest to be elastic.
  • an active inclination adjustment of the backrest relative to the seat plate is not possible with the previously known office chair.
  • the invention has for its object to improve seating and in particular an office chair of the generic type so that the aforementioned adjustment and attachment options for the back and armrests including their locking can be realized with little design and assembly effort are.
  • the pivot axis for the backrest carrier which is fixedly attached to the seat carrier, simultaneously represents the fastening element for holding armrests, with which the pivot axis has a dual function.
  • the swivel axis itself is in the Usually a particularly stable component so that this advantage also benefits from a firm mounting of the armrests.
  • the measure provided according to claim 4 further improves the mounting of the armrest by creating an additional anti-tilt device for the armrest by engaging the projection provided on the armrest foot part in a corresponding recess on the seat support.
  • Claims 6 to 9 relate to an advantageous locking device for a piece of seating furniture, as can be used quite generally between a fixed part and a pivoting part of a piece of seating furniture which can be pivoted relative thereto, in order to determine the pivoting part.
  • the corresponding locking device can be used between the seat support forming the fixed part and the backrest support forming the pivoting part of the office chair according to the present invention.
  • the locking device has a gear part rotatably mounted on the fixed part, lockable in the direction of rotation, and a toothed part arranged on the pivoting part and in engagement with the gear part. Due to the locking of the gear part and its engagement in the toothing part, the pivot part is in a certain pivot position relative to the Fixed part locked.
  • the lock discussed above is a purely mechanical fixing, which can nevertheless be carried out continuously.
  • This mechanical locking device is of a simpler design than known blocking devices with so-called disk packs.
  • the measure specified in claim 7 creates a kind of translation within the locking device, due to which the locking forces to be applied for a stable locking on the gear part are particularly low.
  • the determination of the gear part is possible in different ways. For example, it can be done using a locking screw that can be operated by a handwheel. However, preference is given to the eccentric clamp specified in claim 8 by means of an eccentric lever, as described in more detail in the exemplary embodiment.
  • Claims 10 and 11 characterize advantageous developments of the seating furniture according to the invention with regard to the mounting location of a locking device, for example designed according to at least one of claims 6 to 9, for locking the incline of the backrest support.
  • the specified positioning of the locking device brings on the one hand a high locking effect due to the large distance from the pivot axis.
  • the control unit for the specified eccentric clamp is within easy reach in the front area of the seat.
  • the locking device according to claims 10 and 11 is structurally simple.
  • Claim 12 teaches a particularly simple and compact design of a reset device that automatically spends the backrest support and thus the backrest in the unlocked state of the locking device in a reset position - for example in a maximum forward inclined position.
  • a sudden pivoting of the backrest in the return pivoting direction is avoided by the damping body provided between the backrest and seat support.
  • An office chair has a conventional base frame, not shown in the figures, with five radially extending struts, on the ends of which rollers are arranged.
  • a telescopic support column 1 for height adjustment, which carries a triggerable gas spring for height locking. From this gas spring, the upward protruding release button 2 or the release lever 2 'can be seen for this in FIGS. 1 and 2.
  • On the upper end of the support column 1 is a seat support, designated as a whole by 3, which is injection-molded in one piece from plastic material.
  • This seat support 3 has a dimensionally stable plate 4 which bears an upholstered seat surface, on the underside of which a bearing collar 5 is formed approximately in a central position.
  • a conical sleeve 7 made of metal is injected into its bearing opening 6, with which the seat support 3 rests on the bearing cone 8 at the upper end of the support column 1 with a clamp fit.
  • bearing projections are provided on the underside of the plate 4 over its width, namely the two inner bearing projections 9 and the two outer bearing projections 10.
  • These bearing projections 9, 10 are each provided with bearing holes 11 which are aligned horizontally and transversely to the longitudinal direction L of the seat, in which a pivot axis 12 designed as an open end cylindrical tube is fixedly attached to the seat support 3.
  • This pivot axis 12 extends on both sides into the region of the lateral longitudinal edges 13, 14 of the plate 4 of the seat support 3 and is based on the seat depth S of the seat surface provided by the plate 4 just behind the bearing collar 5 of the seat support 4 with a distance a arranged from the rear edge 15 of the plate 4, which corresponds to approximately one third of the seat depth S.
  • the backrest support which will be described in more detail below, is pivotally mounted on the seat support 3, as a result of which the backrest (not shown) can be tilted at the free ends of the two backrest support tubes 17 fastened to the backrest support 16.
  • each armrest 19 can be inserted into the two insertion openings 18 at the ends of the pivot axis 12.
  • each armrest 19 has an integrally molded foot part 20 at the lower end, into each of which an inwardly extending, protruding plug pin 21 is injected in a form-fitting manner.
  • the free end of the plug pin 21 is in the insertion opening 18 inserted and fixed with the aid of a fastening screw 22 screwed from below through the outer bearing projection 10 and the pivot axis 12.
  • each foot part 20 above the plug pin 21 is provided with a projection 23 which also projects inwards and which engages in a corresponding recess 24 on the outside of the outer bearing projection 10 of the seat support 3.
  • Each armrest 19 is thus secured against being pulled out of the pivot axis 12 and against tilting relative to the latter.
  • the insertion openings 18 and the recesses 24 can each be closed by a common cover cap 25 (FIGS. 6, 7) which is snapped into these parts.
  • the backrest support 16 is designed as a flat box open at the top, which is closed at the bottom by the bottom 26.
  • the backrest support 16 is essentially rectangular with a trapezoidal tapering front end 27, with a corresponding rear wall 28, parallel side walls 29, 30, inclined walls 31, 32 running at an acute angle to one another in the region of the front end 27 and a front wall 33 for lateral limitation of the backrest support 16 are provided.
  • the bottom 26 is provided in the area of the trapezoidal front end 27 with an approximately circular opening 34 for the passage of the support column 1 and the bearing collar 5.
  • the former are each provided on their top with a reinforced bearing block 35 in which a bearing eye 36 is formed.
  • the backrest support 16 is pivotally mounted on the pivot axis 12 between the two inner bearing projections 9 of the seat support 3 in the pivoting direction V (FIG. 1).
  • the two side walls 29, 30 are each flanked on their inside by a two-part guide 37 for the backrest support tubes 17, in which the latter are each fixed by a fastening screw 38 (FIG. 8).
  • a locking device 39 for locking the inclination of the backrest support 16 intended.
  • This consists on the one hand of a row of teeth 40 on the outside of the front wall 33 with tooth elements 41 arranged vertically one above the other, running horizontally and transversely to the longitudinal direction L of the seat, and on the other hand a toothed shaft 42 which engages with the row of teeth 40 with their tooth elements 41 'corresponding to the tooth elements 41' stands.
  • the toothed shaft 42 is rotatably supported with the interposition of friction disks 43, 44 on a clamping bolt 45 which is held by two bearing webs 46, 47 on the underside of the seat support 3.
  • the one bearing web 47 is provided on its outside with a bearing part 48, which is used for the rotary mounting of an eccentric lever 49.
  • an eccentric lever 49 When the eccentric lever 49 is released, the clamping connection between the clamping bolt 45 and the friction disks 43, 44 is released, so that the toothed shaft 42 can be freely rotated in the direction of rotation D (FIG. 1) and thus the backrest support 16 can be pivoted about the pivot axis 12 (pivoting direction V in Fig. 1).
  • the basic concept of the locking device 39 discussed above can be used not only in the manner shown in the exemplary embodiment between the seat support 3 and the backrest support 16. Rather, it can be used quite generally between a fixed part, which is represented by the seat support 3 in the exemplary embodiment, and a pivoting part which can be pivoted relative thereto and which is represented by the backrest support 16 in the exemplary embodiment.
  • a gear part rotatably mounted on the fixed part and lockable in the direction of rotation D which in the present case is formed by the toothed shaft 42, and a toothed part arranged on the pivoting part and in engagement with the gear part, which in the present case represents the tooth row 40, are provided.
  • the distance A of the toothed part (row of teeth 40) from the pivot axis 12 of the pivoting part (backrest support 16) advantageously corresponds to a multiple of the radius r of the gear part (toothed shaft 42). This type of translation achieves a stable locking with a relatively low clamping force of the eccentric lever 49.
  • a reset swivel device 50 is further provided, which essentially consists of a helical compression spring 51.
  • This helical compression spring 51 is arranged in the longitudinal direction L of the seat in the region between the pivot axis 12 and the bottom 26 of the backrest support 16 and is supported on the one hand on the rear side of the bearing collar 5 of the seat support 3.
  • a guide projection 52 on the bearing collar 5 engages in the compression spring 51.
  • the helical compression spring 51 is supported on an abutment body 53, which is displaceably guided in the longitudinal direction of the seat L in a sliding guide formed by two intermediate walls 54, 55 in the backrest support 16.
  • the abutment body 53 also has a guide projection 56 which engages in the helical compression spring 51.
  • the abutment body 53 is provided with a bore which is coaxial with the helical compression spring 51 and is open to the rear and in the outer end of which a nut 57 is inserted in a rotationally fixed manner. This interacts with a grub screw 58 in the manner of a spindle drive, the grub screw 58 being rotatably mounted in the rear wall 28 of the backrest support 16 with a cylindrical extension 59.
  • a rotary knob 60 is placed on the outer end of the extension 59, with the aid of which the threaded pin 58 can be rotated and thus the abutment body 53 can be displaced in the longitudinal direction L of the seat.
  • the restoring force exerted by the helical compression spring 51 on the backrest support 16 can thus be varied in the counterclockwise direction with respect to FIG. 1.
  • damping bodies 61 in the form of so-called “Cellasto blocks” are inserted, which sit in compartments 62 of the backrest support 16 and with their top 63 in a corresponding guide receptacle 64 on the underside support the plate 4 of the seat support 3.
  • These damping bodies 61 counteract the restoring force of the helical compression spring 51, so that after the locking device 39 is released, the backrest support 16 is not pivoted suddenly, but rather pivoted in a damped manner.

Landscapes

  • Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Chairs Characterized By Structure (AREA)

Claims (13)

  1. Siège, en particulier siège de bureau ou de travail comportant un support de pied, une colonne porteuse disposée sur celui-ci, de préférence réglable en hauteur (1), un support de siège (3) logé sur la colonne porteuse (1) muni de bords longitudinaux (13, 14) situés latéralement et un support de dossier (16) logé sur le support de siège (3) de façon à pouvoir basculer pour permettre le maintien en inclinaison réglable d'un dossier, caractérisé en ce qu'un axe solidement fixé sur le support de siège (3), axe de basculement (12) pour le support de dossier (16) s'étend jusque dans la zone des bords longitudinaux situés latéralement (13, 14) du support de siège (3) et sont conçus pour permettre le maintien en position des accoudoirs (19).
  2. Siège selon la revendication 1, caractérisé en ce que l'axe basculant (12) est conçu sous forme de tube cylindrique ouvert sur le côté d'extrémité, tube cylindrique dans les extrémités ouvertes duquel (18) peut respectivement s'insérer un accoudoir (19) avec un axe débrochable (21).
  3. Siège selon la revendication 2, caractérisé en ce que l'axe débrochable (21) est inséré dans une partie de pied (20) de l'accoudoir.
  4. Siège selon la revendication 3, caractérisé en ce que l'accoudoir (19) est muni d'une saillie (23) dans la zone de la partie de pied (20) qui s'emmanche dans un évidement correspondant (24) sur le support de siège (3).
  5. Siège selon l'une des revendications 1 à 4, caractérisé en ce que l'axe pivotant (12) du support de dossier (16) est disposé par rapport à la profondeur de siège (S) de la surface d'assise derrière le logement de support de siège (5, 7) selon un espacement (a) par rapport au bord arrière (15) de la surface de siège qui correspond approximativement à un tiers de la profondeur totale du siège (S).
  6. Siège, en particulier selon l'une des revendications 1 à 5, caractérisé en ce que le dispositif de blocage (39) entre une partie solide et une partie de pivotement pouvant basculer par rapport à celle-ci (16) du siège, lequel dispositif de blocage (39) présente un élément de roue dentée blocable dans la position (D) logé de façon rotative sur l'élément solide (3) et un élément de denture en prise avec l'élément de roue dentée (42), disposé sur l'élément basculant (16).
  7. Siège selon la revendication 6, caractérisé en ce que la distance (A) entre l'élément de denture (40) et l'axe pivotant (12) de l'élément pivotant (support de dossier 16) correspond à un multiple du rayon (r) de l'élément de roue dentée (42).
  8. Siège selon la revendication 6 ou 7, caractérisé en ce que l'élément de denture (42) est blocable par un serrage excentré (49).
  9. Siège selon la revendication 8, caractérisé en ce que le blocage excentré (49) sollicite à l'état desserré l'élément de roue dentée (42) selon une force de freinage définie.
  10. Siège selon l'une des revendications 1 à 9, caractérisé en ce qu'au niveau du bord antérieur (33) disposé en amont du logement ou palier de support de siège (5, 7), bord antérieur du support de dossier (16) est disposé un dispositif de blocage (39), en particulier un dispositif du type selon au moins l'une des revendications 6 à 9, pour le blocage en inclinaison du support de dossier (16).
  11. Siège selon la revendication 10, caractérisé en ce que le système de blocage (39) comporte une série dentée (40) sur le bord antérieur (33) du support de dossier (16), série dentée qui est en prise avec un arbre denté (42) blocable au moyen d'un serrage excentré (49) dans le sens de rotation (D) sur le support de siège (3).
  12. Siège selon l'une des revendications 1 à 11, caractérisé en ce que dans le support de dossier (16) est disposé un ressort (51) exerçant une sollicitation dans la direction d'une position de rappel, ressort qui est logé sensiblement dans la direction longitudinale du siège (L) entre un appui sur le support de siège (3) et un contre-palier (53) logé sensiblement dans la direction longitudinale du siège (L) de façon déplaçable sur le support de dossier (16).
  13. Siège selon la revendication 12, caractérisé en ce qu'entre l'élément porteur de dossier (16) et l'élément porteur de siège (3) est disposé au moins un corps d'amortissement élastiquement déformable (61) pour délimiter la force de rappel exercée par le ressort de rappel (51) sur le support de dossier (16) dans la direction de la position de rappel.
EP94101245A 1993-02-05 1994-01-28 Siège, notamment siège de travail Expired - Lifetime EP0609782B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4303324A DE4303324A1 (de) 1993-02-05 1993-02-05 Sitzmöbel, insbesondere Bürostuhl
DE4303324 1993-02-05

Publications (2)

Publication Number Publication Date
EP0609782A1 EP0609782A1 (fr) 1994-08-10
EP0609782B1 true EP0609782B1 (fr) 1997-05-21

Family

ID=6479714

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94101245A Expired - Lifetime EP0609782B1 (fr) 1993-02-05 1994-01-28 Siège, notamment siège de travail

Country Status (2)

Country Link
EP (1) EP0609782B1 (fr)
DE (2) DE4303324A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19502649A1 (de) * 1995-01-28 1996-08-01 Stoll Kg Christof Arretiermechanik für die neigbare Lehne eines Stuhles
DE19530437C2 (de) * 1995-08-18 2002-11-07 Bock Martin Kunststoff Arretiervorrichtung

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4131315A (en) * 1977-04-16 1978-12-26 Firma Drabert Sohne Chair with deformable armrest
DE3269436D1 (en) * 1982-10-13 1986-04-03 Stoll Gmbh Martin Chair
US4561693A (en) * 1983-06-10 1985-12-31 Knoll International, Inc. Back support tilt and seat and back support height control mechanism for a chair or the like
DE8417429U1 (de) * 1984-06-08 1984-09-20 Hansen, Eckard, 9430 St. Margrethen Punktsynchronverstelleinrichtung für Bürostühle
US4840426A (en) * 1987-09-30 1989-06-20 Davis Furniture Industries, Inc. Office chair
DE3930361C2 (de) * 1989-09-12 1993-11-04 Simon Desanta Stuhl, insbesondere buerostuhl
FR2674414B1 (fr) * 1991-03-26 1995-05-05 Lingranotto Ets Siege a dossier et assise synchronises.

Also Published As

Publication number Publication date
DE59402784D1 (de) 1997-06-26
DE4303324A1 (de) 1994-08-11
EP0609782A1 (fr) 1994-08-10

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