EP0815778B1 - Perfectionnement aux systèmes de flexion différentielle des dossiers de sièges de bureau - Google Patents

Perfectionnement aux systèmes de flexion différentielle des dossiers de sièges de bureau Download PDF

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Publication number
EP0815778B1
EP0815778B1 EP96440052A EP96440052A EP0815778B1 EP 0815778 B1 EP0815778 B1 EP 0815778B1 EP 96440052 A EP96440052 A EP 96440052A EP 96440052 A EP96440052 A EP 96440052A EP 0815778 B1 EP0815778 B1 EP 0815778B1
Authority
EP
European Patent Office
Prior art keywords
bar
torsion
lumbar
seat
user
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
EP96440052A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0815778A1 (fr
Inventor
Frederiks Faiks
Pascal Jaeger
Philippe Mayeur
Robert M. Scheper
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
Steelcase Strafor 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 Strafor SA filed Critical Steelcase Strafor SA
Priority to DK96440052T priority Critical patent/DK0815778T3/da
Priority to AT96440052T priority patent/ATE162937T1/de
Priority to EP96440052A priority patent/EP0815778B1/fr
Priority to ES96440052T priority patent/ES2114755T3/es
Priority to DE69600161T priority patent/DE69600161T2/de
Publication of EP0815778A1 publication Critical patent/EP0815778A1/fr
Application granted granted Critical
Publication of EP0815778B1 publication Critical patent/EP0815778B1/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
    • A47C1/031—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
    • A47C1/03294—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest slidingly movable in the base frame, e.g. by rollers
    • 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
    • A47C1/03255—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
    • A47C1/03277—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with bar or leaf springs
    • A47C1/03279—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with bar or leaf springs of torsion type

Definitions

  • the present invention relates to office chairs with backrests adjustable, and it aims more specifically at improvements adjustable backrest systems with organs for independent adjustment of the thoracic portion and the portion lumbar of these files in order to make them more comfortable thanks to their ability to better adapt to different user back configurations.
  • the mechanism determining the adjustable support of the lumbar portion is mounted fixed by relative to the column on which the seat rests swivel, that is to say that the seat base is fixed. Furthermore, in this same structure, the elements transmitting the action of this mechanism to said lumbar portion are relatively close to each other laterally due to the nature of this mechanism, whereas on the contrary it would be desirable for them to be located at the outer edge of the backrest.
  • the present invention eliminates all of these drawbacks, thanks to a other mechanism, involving means ensuring resistance elastic of each of the support elements by elastic deformation under the action of a torsional stress.
  • the adjustable backrest system includes an adjustment independent of the thoracic portion and the lumbar portion of said backrest, of the type in which a first support element, acting elastically on said thoracic portion is pivotally mounted on the control unit fixed of said adjustment system, while a second support element acts elastically on said lumbar portion, said first and second elements of support operating independently of each other in rotation towards the rear relative to the seat, mechanical means ensuring resistance elastic of the two support elements.
  • each of said mechanical means associated with one of the support elements consists of an organ liable to undergo elastic deformation under the action of a torsional stress, the two members being associated with each other by so that the second intervenes sequentially with respect to the first.
  • organs can in particular be torsion springs, bars torsion or combinations of the two, but preferably according to the invention, they consist of a couple of torsion bars.
  • these means are associated with each other by in such a way that the second intervenes sequentially with respect to the first.
  • the second of these bars is mounted relative to the first so as to intervene after to have undergone the action of the deformation of the first.
  • a first torsion bar determines the inclination of the thoracic portion of the backrest by tilting, around the fixed seat box, a first crew carrying a bar substantially vertical support from the high point of the backrest, and a second bar of torsion determines the inclination of the lumbar portion of the backrest, by tilting, around said first crew, of a second crew carrying columns supporting a substantially horizontal grab bar of the arched area adapting to the user's lumbar area.
  • the first crew consists essentially of a torsion bar horizontal constant section, working over its entire length, fixed to a end to a concentric sheath rotatably attached to the fixed housing of the seat, and serving as a reminder of the rotation of said sheath, which carries a casing tilting to which is fixed a corner bar whose top is articulated to a point on the backrest under pressure from the back of the rib cage the user, and preferably comprising at its other end means for preload allowing the hardness of the reaction to be adjusted at will of the file at said pressure.
  • the second crew consists essentially of a torsion bar horizontal preferably formed of four equal bars with square section, in order to allow the development of a higher degree of twist, this composite bar serving similarly to the previous one, as an organ to a pair of sleeves rotatably attached to said tilting casing and carrying at each end a vertical column, preferably at height adjustable, these columns supporting a determining horizontal grab bar, behind the backrest, the optimal degree of curvature of the lumbar region of the body of the user, ie the base of the spine and the pelvis.
  • the central area of this second torsion bar includes prestressing means regulating at will the reaction of the lumbar portion of the backrest at user pressure.
  • the mobile elements are shown in solid lines in rest position, and in broken line in deformed position under the effect of user body.
  • the seat according to the invention comprises a fixed casing B based on a pivoting column system P.
  • the seat A of the seat On the fixed box B is mounted the seat A of the seat, having preferably certain features which will be explained below.
  • first torsion bar 1 ( Figure 2) carrying a first crew consisting of a tilting casing 2 integral a sleeve 11 concentric with the bar 1, to which it is fixed at one end 1a, this sleeve being rotatably attached to the housing B, and carrying a bar 3, having a first section 3a, oriented towards the rear substantially in the horizontal extension of the housing 2, and a second section 3b, at right angles with section 3a, extending upwards behind the backrest D which is attached to it hooked by a system of links 4 ensuring its maintenance whatever the height, preferably with the interposition of a silent block.
  • the second torsion bar 5 (figures 3 and 3a), mounted in a pair of rotary sleeves 12 and 13 welded to ends 5a and 5b of the bar, and carrying at their two external ends columns 6 substantially vertical, or slightly inclined backwards at rest, which are located on either side of the backrest, and which are joined to their upper part by a horizontal grab bar 7 in front of which is arch the lower portion of the backrest.
  • the height of the columns 6 can be adjusted, for example by means of racks, with which cooperate with detachable elastic pawls or fingers or analogues (as shown schematically in 14). As one can see in FIG.
  • the bar 5 is made up of four bars 5a, 5b, 5c, 5d of identical square sections, but each equal to a quarter of the section of the bar 5.
  • the contact surfaces of the small bars 5a, 5b, 5c, 5d slide against each other, facilitating the overall deformation by twisting the bar 5.
  • the user's lumbar portion will exert pressure on the lower arched part of the backrest D and the grab bar 7, with the same elastic holding effect, in degree and hardness. Moving in tilting forward of this lower portion is limited by stopper adjustable tabs fixed to the sheath against stops 16 fixed to the seat.
  • the torsion bar 1 may include a prestressing system to adapt the hardness.
  • a member 8 actuated by a button 9 located under the seat, and which tends to subject the bar 1 to a beginning of torsion, by support on the fixed base B even before the user exerts his weight on the folder. This beginning of torsion makes it harder to continue the user action.
  • torsion bar 5 Similar means can be used with torsion bar 5, such as illustrated in Figure 3.
  • the prestressing is exerted, not at the free end of the bar, as in the previous case, but at the center 10 of the bar, which then works twice as much on each side to reach the same inclination of the columns 6.
  • the bar 5 carries a housing 15 (FIG. 3a), the tilting of which, controlled by the rod 10 'screwed into the housing 2, modifies the torsion of the bar 5.
  • This structure ensures symmetry of operation, the bar serving at the same rotation axis time.
  • the tilt point 1 of the housing 2 is located at the front of the pivoting column P. This results in a very low inclination of the rear portion of the seat A, (the front portion resting on the case B) even for a relatively large tilting of the backrest D, this which is sometimes sought after today. For example, for a report of distances of 2.5, backrest tilting up to 24 ° angle will cause an inclination of the seat only about 9 °. This contributes to overall seat comfort.
  • the top of the seat A is convex, as shown in C, unlike the usual geometry in this type of seat.
  • the backrest D must be flexible enough to allow independent bending of its upper portion and its portion lower.
  • a composite material may be used, for example formed of glass fibers embedded in polyether foam; so the seat comfort is formed by the curve and not by the thickness of the foam.

Landscapes

  • Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Chairs For Special Purposes, Such As Reclining Chairs (AREA)
  • Chair Legs, Seat Parts, And Backrests (AREA)
EP96440052A 1996-06-28 1996-06-28 Perfectionnement aux systèmes de flexion différentielle des dossiers de sièges de bureau Expired - Lifetime EP0815778B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DK96440052T DK0815778T3 (da) 1996-06-28 1996-06-28 Forbedringer i systemer til differentiel bøjning af ryglæn på kontorstole
AT96440052T ATE162937T1 (de) 1996-06-28 1996-06-28 Verbesserungen für systeme mit differentieller formung von rückenlehnen von bürostühlen
EP96440052A EP0815778B1 (fr) 1996-06-28 1996-06-28 Perfectionnement aux systèmes de flexion différentielle des dossiers de sièges de bureau
ES96440052T ES2114755T3 (es) 1996-06-28 1996-06-28 Perfeccionamientos en los sistemas de flexion diferencial de los respaldos de butacas de despacho.
DE69600161T DE69600161T2 (de) 1996-06-28 1996-06-28 Verbesserungen für Systeme mit differentieller Formung von Rückenlehnen von Bürostühlen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP96440052A EP0815778B1 (fr) 1996-06-28 1996-06-28 Perfectionnement aux systèmes de flexion différentielle des dossiers de sièges de bureau

Publications (2)

Publication Number Publication Date
EP0815778A1 EP0815778A1 (fr) 1998-01-07
EP0815778B1 true EP0815778B1 (fr) 1998-02-04

Family

ID=8225411

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96440052A Expired - Lifetime EP0815778B1 (fr) 1996-06-28 1996-06-28 Perfectionnement aux systèmes de flexion différentielle des dossiers de sièges de bureau

Country Status (5)

Country Link
EP (1) EP0815778B1 (da)
AT (1) ATE162937T1 (da)
DE (1) DE69600161T2 (da)
DK (1) DK0815778T3 (da)
ES (1) ES2114755T3 (da)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9510684B2 (en) 2010-06-15 2016-12-06 Johann Burkhard Schmitz Chair

Families Citing this family (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6557939B1 (en) 1998-10-21 2003-05-06 Vitra Patente Ag Adjustment mechanism, back cover and arm rest for a chair
IT1308075B1 (it) * 1999-06-04 2001-11-29 Pro Cord Srl Sedia con sedile oscillante
CA2422015A1 (en) * 2000-09-19 2002-03-28 Han-Keel Yoo Chair for correcting an improper alignment of spinal vertebrae and method for correcting an improper alignment of spinal vertebrae by means of the chair
CA2626453C (en) 2002-02-13 2011-02-01 Herman Miller, Inc. Tilt chair having a flexible back, adjustable armrests and adjustable seat depth, and methods for the use thereof
DE102007044130A1 (de) * 2007-09-15 2009-03-19 König + Neurath AG Rückenlehne insbesondere eines Bürostuhls
KR100903215B1 (ko) 2008-10-10 2009-06-18 주식회사 시디즈 틸팅 가능 의자
NL1037679C2 (nl) * 2010-02-03 2011-08-04 Konink Ahrend N V Stoel, in het bijzonder een bureaustoel.
USD637423S1 (en) 2010-04-13 2011-05-10 Herman Miller, Inc. Chair
USD657166S1 (en) 2010-04-13 2012-04-10 Herman Miller, Inc. Chair
USD652657S1 (en) 2010-04-13 2012-01-24 Herman Miller, Inc. Chair
USD639091S1 (en) 2010-04-13 2011-06-07 Herman Miller, Inc. Backrest
USD650206S1 (en) 2010-04-13 2011-12-13 Herman Miller, Inc. Chair
US8449037B2 (en) 2010-04-13 2013-05-28 Herman Miller, Inc. Seating structure with a contoured flexible backrest
USD653061S1 (en) 2010-04-13 2012-01-31 Herman Miller, Inc. Chair
CH704814A2 (de) * 2011-04-12 2012-10-15 Vitra Patente Ag Mechanik für einen Stuhl mit synchron verstellbarer Ausrichtung von Rückenlehne und Sitz.
DE202012007254U1 (de) * 2012-07-26 2013-10-28 Proflm Sp. Z.O.O. Sitzmöbel, insbesondere Bürostuhl
US11229294B2 (en) 2012-09-20 2022-01-25 Steelcase Inc. Chair assembly with upholstery covering
US11304528B2 (en) 2012-09-20 2022-04-19 Steelcase Inc. Chair assembly with upholstery covering
US8998339B2 (en) 2012-09-20 2015-04-07 Steelcase Inc. Chair assembly with upholstery covering
NO2908696T3 (da) * 2012-10-18 2018-05-05
CA3026655A1 (en) 2016-06-11 2017-12-14 Humanscale Corporation Chair with articulating backrest
EP3927215A4 (en) 2019-02-21 2023-03-15 Steelcase Inc. BODY SUPPORT ASSEMBLY AND METHODS OF USE AND ASSEMBLY THEREOF
US11357329B2 (en) 2019-12-13 2022-06-14 Steelcase Inc. Body support assembly and methods for the use and assembly thereof

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3072436A (en) * 1960-04-14 1963-01-08 Moore Edwin Rosco Tilting devices for chair seats and chair backs
DE3719784A1 (de) * 1987-06-13 1988-12-22 Roeder Soehne Sitzmoebelfab Sitzmoebel
US5249839A (en) * 1991-11-12 1993-10-05 Steelcase Inc. Split back chair

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9510684B2 (en) 2010-06-15 2016-12-06 Johann Burkhard Schmitz Chair

Also Published As

Publication number Publication date
DE69600161T2 (de) 1998-09-17
ATE162937T1 (de) 1998-02-15
DE69600161D1 (de) 1998-03-19
EP0815778A1 (fr) 1998-01-07
ES2114755T3 (es) 1998-06-01
DK0815778T3 (da) 1998-09-23

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