EP1878360A1 - Chaise avec siège et dossier à mouvement synchronisé - Google Patents

Chaise avec siège et dossier à mouvement synchronisé Download PDF

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Publication number
EP1878360A1
EP1878360A1 EP06425482A EP06425482A EP1878360A1 EP 1878360 A1 EP1878360 A1 EP 1878360A1 EP 06425482 A EP06425482 A EP 06425482A EP 06425482 A EP06425482 A EP 06425482A EP 1878360 A1 EP1878360 A1 EP 1878360A1
Authority
EP
European Patent Office
Prior art keywords
backrest
seat
support base
support structure
chair
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Withdrawn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
EP06425482A
Other languages
German (de)
English (en)
Inventor
Giancarlo Piretti
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.)
Pro Cord SpA
Original Assignee
Pro Cord SpA
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 Pro Cord SpA filed Critical Pro Cord SpA
Priority to EP06425482A priority Critical patent/EP1878360A1/fr
Priority to US11/772,967 priority patent/US20080012412A1/en
Priority to MX2007008192A priority patent/MX2007008192A/es
Priority to JP2007179728A priority patent/JP2008018239A/ja
Priority to CA002593292A priority patent/CA2593292A1/fr
Priority to CNA2007101290938A priority patent/CN101103865A/zh
Publication of EP1878360A1 publication Critical patent/EP1878360A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C1/00—Chairs adapted for special purposes
    • A47C1/02—Reclining or easy chairs
    • A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03255—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest with a central column, e.g. rocking office chairs
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C1/00—Chairs adapted for special purposes
    • A47C1/02—Reclining or easy chairs
    • A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03205—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest having adjustable and lockable inclination
    • A47C1/03233—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest 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
    • 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
    • A47C1/03205—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest having adjustable and lockable inclination
    • A47C1/03238—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest having adjustable and lockable inclination by means of peg-and-notch or pawl-and-ratchet mechanism
    • 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

Definitions

  • the present invention relates to a chair with seat and backrest with synchronised movement.
  • the invention relates to a chair comprising a support base, a seat that is movable relative to the support base between a lowered position and a raised position, and a backrest articulated to the support base around a transverse axis and oscillating around said axis between a position of maximum forward inclination and a position of maximum backward inclination, and in which the seat and the backrest are mutually connected in such a way that when the backrest is in the position of maximum forward inclination, the seat is in lowered position and when the backrest is in the position of maximum backward inclination, the seat is in the raised position.
  • Chairs of the type defined above are known in the field as "weight-activated chairs".
  • the weight of the user tends to push the seat downward and tends to maintain the backrest in the position of maximum forward inclination.
  • the backward thrust is contrasted by the weight of the user bearing down on the seat.
  • Chairs of this kind are normally provided with an elastic device which tends to thrust the seat towards the lowered position and the backrest towards the position of maximum forward inclination, so the backwards thrust on the backrest has to overcome both the weight bearing down on the seat and the elastic force which tends to maintain the backrest in the position of maximum forward inclination.
  • the object of the present invention is to provide a chair of the type indicated above having a simpler, more economical and more compact structure than prior art chairs.
  • said object is achieved by a chair having the characteristics set out in claim 1.
  • the reference number 10 designates a chair according to the present invention.
  • the chair 10 comprises a fixed support base 12, a seat 14 and a backrest 16.
  • the support base 12 comprises a transverse element 18 with a channel shape, provided at its lateral ends with two flanges 20 extending upwards.
  • the base 12 is connected to a vertical central upright (not shown) with adjustable height, projecting upwards from a support formed by a plurality of radial arms provided at their outer ends with casters, according to an arrangement that is widely known in the office chair industry.
  • the backrest 16 comprises a support structure 22 that bears a shaped panel 24 to support the occupant's back.
  • the support structure 22 of the backrest 16 has two lateral sections 26 that extend in the longitudinal direction.
  • the two lateral sections 26 are articulated to the flanges 20 of the support base 12 around a transverse horizontal axis 28.
  • the two lateral sections 26 of the backrest 16 are provided with transverse holes 30 with mutually aligned axes, which are connected by means of trunnions (not shown) to corresponding holes 32 provided at the top ends of the flanges 20 of the support base 12.
  • the two lateral sections 26 of the backrest 16 are provided with respective connecting portions 34 which extend forward relative to the articulation axis 28.
  • the connecting portions 34 are provided at their front ends with transverse holes 36 with mutually aligned axes.
  • the backrest 14 comprises a support structure 38 and a panel 40.
  • the support structure 38 in turn comprises a transverse element 42 and two longitudinal elements 44 fastened to the transverse element 42.
  • the two longitudinal elements 44 have respective longitudinal guides engaged by blocks 46 fastened to the lower part of the panel 40. This arrangement enables to adjust the position of the panel 40 in the longitudinal direction relative to the support structure 38.
  • One of the two blocks 46 is provided with an arresting device that allows to lock the panel 40 in a pre-selected position, disengageable by means of a lever 48.
  • the transverse element 42 of the support structure of the backrest 38 is provided at its lateral ends with two vertical arms 50 that are fixed relative to the transverse element 42.
  • the two arms 50 are provided with respective holes with transverse axis 52.
  • the vertical arms 50 of the transverse element 42 are articulated to the connecting portions 34 of the backrest 16 by means of two pivot pins 54, each of which engages two aligned holes 36, 52.
  • the pivot pins 54 achieve an articulated connection between the transverse element 42 of the support structure of the backrest 38 and the support structure of the backrest 22, around an axis designated with the reference 56.
  • the articulation axis 56 is parallel and displaced forward relative to the articulation axis 28 between the backrest 16 and the support base 12.
  • the support structure of the backrest 38 is connected to the support base 12 by means of two rocking levers 58.
  • Each rocking lever 58 has a first end articulated to the support base 12 and a second end articulated to the support structure of the backrest 38. More specifically, the second end of each lever 58 is articulated to a respective longitudinal element 44 of the support structure of the backrest 38.
  • the axes of articulation of the levers 58 are respectively designated by the references 60 and 62. Said axes are mutually parallel and they are parallel to the axes of articulation 28 and 56 defined previously. In the example shown in the figures, two levers 58 are provided, but a single lever 58 could also be sufficient to achieve the same result.
  • the support base 12 bears an elastic element constituted by a flexing bar 64.
  • the flexing bar 64 extends in the transverse direction, parallel to the axes of articulation 28, 56.
  • the ends of the flexing bar 64 extend in the transverse direction beyond the transverse element 42 of the support structure of the seat 38. Said ends engage respective holes of two vertical levers 66.
  • the top ends of the vertical levers 66 are articulated to the connecting portions 34 of the backrest 16.
  • the top ends of the levers 66 are articulated to the connecting portions 34 by means of the same pivot pins 54 that connect in articulated fashion the connecting portions 34 of the backrest 16 to the vertical flanges 50 of the support structure of the backrest 38.
  • the flexing bar 34 can be constituted by a metal rod with any cross section, e.g. circular, square, rectangular, etc.
  • the flexing bar 64 could also be formed as a leaf spring, with a plurality of mutually fastened superposed strips. A central part of the flexing bar 64 is fastened to the support base 12 whilst the lateral portions of the flexing bar 64 can deform elastically relative to the fixed central portion.
  • the support base 12 comprises two fixed pivot pins 68 and two movable pivot pins 70.
  • the pivot pins 68, 70 are provided with through holes with transverse axis through which extends the flexing bar 64.
  • the holes of the pivot pins 68, 70 are mutually aligned and the movable pivot pins 70 are positioned exteriorly in the transverse direction relative to the fixed pivot pins 68.
  • the movable pivot pins 70 extend through respective transverse slots 72 of the support base 12.
  • the movable pivot pins 70 engage with play the flexing bar 64 and can be displaced relative to the support base 12 by means of an adjustment mechanism that enables to move the pivot pins 70 jointly.
  • the displacement of the pivot pins 70 varies the free inflexion length of the lateral ends of the bar 64. Consequently, displacing the movable pivot pins 70 varies the stiffness of the flexing bar 64.
  • FIGs 6 and 7 show an example of the adjustment mechanism that controls the movement of the movable pivot pins 70.
  • Each movable pivot pin 70 is fastened to a respective adjustment rod 74.
  • the two rods 74 are positioned on the lower surface of the support base 12 and have respective racks 76 that mesh with a same gearwheel 78 freely rotatable around a vertical axis.
  • One of the two adjustment rods 74 is provided with an actuation grip 80. If the grip 80 is moved in the transverse direction, the two rods 74 are jointly moved in the direction indicated by the arrows 82 in Figures 6 and 7.
  • Figure 6 shows the condition in which the pivot pins 70 are in the outermost position, which corresponds to the maximum stiffness of the flexing bar 64.
  • Figure 7 shows the condition in which the pivot pins 70 are in the innermost position, which corresponds to the maximum flexibility (or minimum stiffness) of the flexing bar 74.
  • Figures 3 and 4 show the two extreme positions of the chair according to the present invention.
  • the flexing bar 64 is in non-deformed position.
  • the backrest 16 is in the position of maximum forward inclination and the seat 14 is in its fully lowered position.
  • the chair assumes this configuration when it is not occupied by a user or when the user sits on the seat 14 but exerts no backwards force on the backrest 16.
  • Figure 4 shows the backrest 16 in the configuration of maximum backward inclination.
  • the flexing bar 64 is in the condition of maximum inflexion and the seat 14 is in the fully raised position. This is the configuration assumed by the chair when the user bears backwards on the backrest with all his/her weight.
  • the rearward thrust imparted by the user is contrasted by the weight of the user on the seat 14 and by the return force of the flexing bar 64.
  • connection between the seat 14 and the support base 12 is achieved by means of the rocking levers 58 and by means of the connecting portions 34.
  • the geometry of this connection is such that the seat moves forward during its motion from the lowered position to the raised position and, simultaneously, it changes its inclination relative to a horizontal plane. This movement of the backrest enables to obtain ideal conditions from the ergonomic viewpoint in any position of the chair.
  • a flexing bar 64 as an elastic element to return the backrest 16 in the position of maximum forward inclination enables considerably to reduce the dimensions of the support base 12.
  • the mechanism for adjusting the stiffness of the elastic organ also becomes particularly simple.
  • the ends of the flexing bar can be connected to downward extensions of the vertical arms 50.
EP06425482A 2006-07-11 2006-07-11 Chaise avec siège et dossier à mouvement synchronisé Withdrawn EP1878360A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP06425482A EP1878360A1 (fr) 2006-07-11 2006-07-11 Chaise avec siège et dossier à mouvement synchronisé
US11/772,967 US20080012412A1 (en) 2006-07-11 2007-07-03 Chair with seat and backrest with synchronised movement
MX2007008192A MX2007008192A (es) 2006-07-11 2007-07-04 Silla con asiento y respaldo con movimiento sincronizado.
JP2007179728A JP2008018239A (ja) 2006-07-11 2007-07-09 シートと背もたれとが連動する椅子
CA002593292A CA2593292A1 (fr) 2006-07-11 2007-07-11 Fauteuil avec siege et dossier mus en synchronisme
CNA2007101290938A CN101103865A (zh) 2006-07-11 2007-07-11 带有同步运动的椅座和靠背的座椅

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06425482A EP1878360A1 (fr) 2006-07-11 2006-07-11 Chaise avec siège et dossier à mouvement synchronisé

Publications (1)

Publication Number Publication Date
EP1878360A1 true EP1878360A1 (fr) 2008-01-16

Family

ID=37496876

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06425482A Withdrawn EP1878360A1 (fr) 2006-07-11 2006-07-11 Chaise avec siège et dossier à mouvement synchronisé

Country Status (6)

Country Link
US (1) US20080012412A1 (fr)
EP (1) EP1878360A1 (fr)
JP (1) JP2008018239A (fr)
CN (1) CN101103865A (fr)
CA (1) CA2593292A1 (fr)
MX (1) MX2007008192A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018160647A1 (fr) * 2017-03-02 2018-09-07 Knoll, Inc. Mécanisme de bascule de dos de chaise

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103479112A (zh) * 2013-09-24 2014-01-01 浙江永艺家具股份有限公司 一种转椅底盘
US10579161B2 (en) * 2014-07-31 2020-03-03 Hewlett-Packard Development Company, L.P. ION writing calibration
ITUB20159640A1 (it) * 2015-12-22 2017-06-22 Pro Cord Spa Sedia pieghevole
DE102017214298A1 (de) * 2017-08-16 2019-02-21 Sedus Stoll Ag Verbindungsanordnung für eine Rückenlehne und Büro- oder Konferenzsitzmöbel

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002032260A1 (fr) * 2000-10-18 2002-04-25 Enrico Cioncada Fauteuil à position variable
WO2002102199A1 (fr) * 2001-06-15 2002-12-27 Hon Technology Inc. Chaise ergonomique amelioree
US20030230918A1 (en) * 2002-06-18 2003-12-18 Hector Serber Dynamically balanced seat assembly having independently and arcuately movable seat and backrest and method
US20050146184A1 (en) * 2003-12-30 2005-07-07 Machael Jay R. Chair with backward and forward passive tilt capabilities

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4840426A (en) * 1987-09-30 1989-06-20 Davis Furniture Industries, Inc. Office chair
US4877291A (en) * 1987-12-14 1989-10-31 Taylor William P Reclining chair
US5308145A (en) * 1992-02-12 1994-05-03 Kimball International Marketing, Inc. Reclining chair
IT1270377B (it) * 1993-05-27 1997-05-05 Pro Cord Srl Sedia con schienale oscillante
US6086153A (en) * 1997-10-24 2000-07-11 Steelcase Inc. Chair with reclineable back and adjustable energy mechanism
US7273253B2 (en) * 2004-06-09 2007-09-25 Kimball International, Inc. Chair ride mechanism with tension assembly

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002032260A1 (fr) * 2000-10-18 2002-04-25 Enrico Cioncada Fauteuil à position variable
WO2002102199A1 (fr) * 2001-06-15 2002-12-27 Hon Technology Inc. Chaise ergonomique amelioree
US20030230918A1 (en) * 2002-06-18 2003-12-18 Hector Serber Dynamically balanced seat assembly having independently and arcuately movable seat and backrest and method
US20050146184A1 (en) * 2003-12-30 2005-07-07 Machael Jay R. Chair with backward and forward passive tilt capabilities

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018160647A1 (fr) * 2017-03-02 2018-09-07 Knoll, Inc. Mécanisme de bascule de dos de chaise
US10231546B2 (en) 2017-03-02 2019-03-19 Knoll, Inc. Chair back tilt mechanism
JP2020508778A (ja) * 2017-03-02 2020-03-26 ノル・インコーポレイテッド 椅子の背部傾動機構
US10743667B2 (en) 2017-03-02 2020-08-18 Knoll, Inc. Chair back tilt mechanism

Also Published As

Publication number Publication date
JP2008018239A (ja) 2008-01-31
US20080012412A1 (en) 2008-01-17
CA2593292A1 (fr) 2008-01-11
CN101103865A (zh) 2008-01-16
MX2007008192A (es) 2009-01-07

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