US20010050500A1 - Chair with seat and backrest that oscillate in a synchronized way - Google Patents

Chair with seat and backrest that oscillate in a synchronized way Download PDF

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Publication number
US20010050500A1
US20010050500A1 US09/871,884 US87188401A US2001050500A1 US 20010050500 A1 US20010050500 A1 US 20010050500A1 US 87188401 A US87188401 A US 87188401A US 2001050500 A1 US2001050500 A1 US 2001050500A1
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US
United States
Prior art keywords
backrest
seat
supporting structure
blocking
aforesaid
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.)
Abandoned
Application number
US09/871,884
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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
Assigned to PRO CORD SPA reassignment PRO CORD SPA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: PIRETTI, GIANCARLO
Publication of US20010050500A1 publication Critical patent/US20010050500A1/en
Abandoned 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
    • A47C1/03205—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
    • A47C1/03255—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
    • 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
    • A47C1/03261—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 a chair with seat and backrest that oscillate in a synchronized way. More precisely, the invention relates to a chair of the type comprising:
  • a backrest-supporting structure articulated to the base structure about a first transverse axis
  • a seat-supporting structure which is mobile with respect to the base structure in a way synchronized with the movement of oscillation of the backrest-supporting structure
  • the purpose of the present invention is to provide a chair of the type specified above that enables the aforesaid drawbacks to be overcome.
  • FIGS. 1A and 1B are side elevations of a chair according to the present invention in two operating conditions
  • FIG. 2 is a partial perspective view of the mechanism of the chair indicated by the arrow II in FIGS. 1A and 1B;
  • FIG. 3 is a section according to the line III-III of FIG. 2;
  • FIGS. 4 and 5 are sections according to the line IV-IV of FIG. 3 in two operating positions
  • FIGS. 6 and 7 are sections according to the line VI-VI of FIG. 3 in two operating positions
  • FIG. 8 is a perspective view of the control device indicated by the arrow VIII in FIG. 3;
  • FIGS. 9 and 10 are sections according to the line IX-IX of FIG. 8, illustrating the control device respectively in the releasing position and in the blocking position;
  • FIG. 11 is a section according to the line XI-XI of FIG. 10.
  • FIG. 12 is a section according to the line XII-XII of FIG. 9.
  • the number 10 designates a chair comprising a central support 12 , which is height-adjustable (of a type of itself known) and carries at its top a base structure 14 .
  • the base structure 14 carries a seat 16 , a backrest 18 , and a pair of armrests 20 .
  • the base structure 14 is generically box-shaped, open at the top, and fixed to the top end of the central support 12 .
  • a transverse tubular element 22 is fixed to the base structure 12 and carries, inside it, a torsion bar 24 consisting, for example of a pack of metal laminas.
  • the backrest 18 comprises a supporting structure including two shaped tubular elements 26 , the bottom ends of which are articulated to the tubular element 22 about a first transverse axis A.
  • the tubular elements 26 constituting the backrest-supporting structure are fixed to the opposite ends of the torsion bar 24 .
  • Each armrest 20 is carried by an upright 30 which is height-adjustable and which, at its bottom end, is fixed to the corresponding end of a tubular element 26 of the backrest-supporting structure. In this way, as illustrated in FIGS. 1A and 1B, the armrests 20 can oscillate in an integral way with the backrest 18 about the transverse axis A.
  • a central area of the torsion bar 24 is fixed to an adjusting lever 32 .
  • This fixing may be obtained, for example, by shape-fitting between the rectangular section of the torsion bar 24 and a hole having a corresponding shape made in the adjusting lever 32 .
  • one end of the adjusting lever 32 is connected to the base structure 14 by means of an adjusting device 34 that enables modification of the pre-loading of the torsion bar 24 .
  • the adjusting device 34 comprises a screw 36 fixed to an adjusting knob 38 .
  • the screw 36 engages an internal thread 40 which cooperates with the top part of a pressure element 42 .
  • the said pressure element 42 rests on one end of the adjusting lever 32 and is shaped in such a way as to provide shape-fitting with the lever 32 so as to prevent rotation of the pressure element 42 about the axis of the screw 36 .
  • rotation of the adjusting knob 38 enables modification of the angular position of the adjusting lever 32 with respect to the base structure 14 .
  • the variation in position of the lever 32 modifies the elastic pre-loading of the torsion bar 24 , i.e., the force that must be applied to the backrest to overcome the force of contrast of the spring and cause an oscillation of the backrest backwards about the transverse axis A.
  • the chair 10 comprises a seat-supporting structure 44 , which is generally box-shaped and open at the bottom, and on which the seat 16 with the corresponding padding is fixed.
  • the two shaped tubular elements 26 constituting the backrest-supporting structure are connected together by a transverse rod 46 parallel to the articulation axis A.
  • the seat-supporting structure 44 is articulated in its rear part about the rod 46 .
  • the said articulation is obtained, for example, by means of a pair of bushings 48 which are carried by opposite side walls of the seat-supporting structure 44 and engage the rod 46 in a rotating way.
  • the seat-supporting structure 44 is thus articulated to the backrest-supporting structure 26 about an axis B (FIG. 3) parallel to the articulation axis A between the backrest-supporting structure 26 and the base structure 14 .
  • the front part of the seat-supporting structure 44 is articulated to the base structure 14 by means of a pair of connecting rods 50 , each of which has a bottom end articulated to the base structure 14 about an axis 52 and a top end articulated to the seat-supporting structure 44 about an axis 54 .
  • the articulation axes 52 and 54 are parallel to the articulation axes A and B.
  • the seat-supporting structure 44 is connected to the base structure 14 by means of an articulated-quadrilateral mechanism, the said quadrilateral being formed by the lines joining the articulation axes A and B and, respectively, 53 and 54 .
  • the seat 10 is moreover provided with a device for blocking the seat and backrest in a plurality of different positions.
  • the blocking device comprises a rocker arm 56 having a central part articulated on the transverse tubular element 22 about the axis A, a first end articulated to the rod 46 about the axis B, and a second end provided with a plurality of holes 58 , 60 which can be engaged by respective blocking elements.
  • the rocker arm 56 is preferably provided with a pair of elastic inserts 62 , 64 , which, as illustrated in FIGS. 4 and 5, are designed to bear upon the base structure 14 to define a position of maximum inclination forwards (FIG. 4) and a position of maximum inclination backwards (FIG. 5).
  • the chair 10 comprises a control device 66 that can be operated manually to block or release synchronized oscillation of the seat and backrest.
  • the control device 66 comprises a support 68 fixed to the base structure 14 of the chair.
  • a control shaft 70 is carried by the support 68 in an oscillating way about its own axis and can oscillate between a blocking position and a releasing position.
  • the shaft 70 carries, at one of its ends, a control lever 71 that can be operated manually.
  • a transverse pin 72 is fixed to the shaft 70 and has a head 74 which projects out from the support 68 .
  • the pin 72 co-operates with an arrest mechanism 76 designed to define two retention positions corresponding to the blocking position and to the releasing position.
  • the arrest mechanism 76 comprises a first arrest element 78 and a second arrest element 80 provided with respective seats having a semicircular shape that are set facing one another and are designed to grip, between them, a portion of the pin 72 to perform the action of retention.
  • the two retention elements 78 , 80 are slidable one with respect to the other along the axis of the shaft 70 and are elastically pushed against one another by an elastic element constituted, for example, by a helical spring in compression 84 . It will be realized that by applying a torque higher than a preset value on the axis of the shaft 70 by means of the control lever 71 it is possible to cause the pin 72 to move by snap action from one to the other of the two operating positions illustrated in FIGS. 9 and 10.
  • the control device 66 comprises a pair of blocking pins 86 , 88 which are slidable within respective seats 90 integral with the base structure 14 . As may be seen in FIGS. 9 and 10, the blocking pins 86 , 88 are slidable, in a direction orthogonal to the rocker arm 56 , between the releasing position illustrated in FIG. 9 and the blocking position illustrated in FIG. 10.
  • the control device 66 comprises a pair of pin springs 92 , each of which has a first arm 94 that engages the head 74 of the pin 72 and a second arm 96 which engages a radial appendage 98 of a respective blocking pin 86 , 88 .
  • Each pin spring 92 has a central portion which is carried, so that it is free to turn, by a pin 100 integral with the support 68 of the control device 66 .
  • the movement of the pin 72 from the releasing position to the blocking position controls, by means of the springs 92 , sliding of the blocking pins 86 , 88 from a retracted position of release (FIG. 9) to an extracted position of blocking (FIG. 10).
  • the springs 92 Withhold the blocking pins 86 , 88 in an inoperative, retracted, position.
  • the rocker arm 56 is free to oscillate about the axis A.
  • the backrest and seat are pushed by the torsion spring 24 towards the position illustrated in FIG. 1A and are free to oscillate backwards (i.e., to be inclined backwards) under the action of a thrust exerted backwards by the user.
  • the rocker arm 56 is integral with the base structure 14 , given that the engagement of one of the blocking pins 86 or 88 in a corresponding hole 58 or 60 prevents rotation of the rocker arm 56 about the axis A. It will be appreciated that the blocking of the rocker arm 56 prevents the movement of oscillation of the seat and backrest and that each hole 58 , 60 defines a different blocking position of the seat and backrest.
  • the chair is also provided with a second lever 102 , which may be operated manually to control, in a way in itself known, a gas-operated spring which controls height-adjustment of the chair.

Landscapes

  • Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Chairs Characterized By Structure (AREA)
  • Chairs For Special Purposes, Such As Reclining Chairs (AREA)
  • Special Chairs (AREA)
  • Chair Legs, Seat Parts, And Backrests (AREA)
US09/871,884 2000-06-06 2001-06-01 Chair with seat and backrest that oscillate in a synchronized way Abandoned US20010050500A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2000TO000538A IT1320403B1 (it) 2000-06-06 2000-06-06 Sedia con sedile e schienale oscillanti in modo sincronizzato.
ITT02000A000538 2000-06-06

Publications (1)

Publication Number Publication Date
US20010050500A1 true US20010050500A1 (en) 2001-12-13

Family

ID=11457791

Family Applications (1)

Application Number Title Priority Date Filing Date
US09/871,884 Abandoned US20010050500A1 (en) 2000-06-06 2001-06-01 Chair with seat and backrest that oscillate in a synchronized way

Country Status (5)

Country Link
US (1) US20010050500A1 (zh)
EP (1) EP1161904A1 (zh)
JP (1) JP2002010852A (zh)
CN (1) CN1327781A (zh)
IT (1) IT1320403B1 (zh)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7243993B2 (en) * 2002-07-23 2007-07-17 Okamura Corporation Tilting mechanism for a chair and a chair having the same
US20090242700A1 (en) * 2006-05-11 2009-10-01 Patrick Raymond Seat
KR20130038121A (ko) * 2010-02-26 2013-04-17 도나티 에스.피.에이. 의자의 시트와 등받이를 동기화하는 장치
US10231545B2 (en) * 2015-10-15 2019-03-19 Co.Fe.Mo. Industrie S.R.L. Oscillation mechanism for chairs
US10813458B2 (en) 2016-07-08 2020-10-27 Co.Fe.Mo. Industrie S.R.L. Tilting mechanism for chairs
US11109683B2 (en) 2019-02-21 2021-09-07 Steelcase Inc. Body support assembly and method for the 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
US11478082B2 (en) 2020-12-22 2022-10-25 Barbara Gervais Care chair

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1320420B1 (it) 2000-06-09 2003-11-26 Pro Cord Srl Sedia con sedile oscillante.
JP4818506B2 (ja) * 2000-11-06 2011-11-16 株式会社岡村製作所 椅子における背凭れの傾動装置
JP2008049079A (ja) * 2006-08-28 2008-03-06 Kokuyo Co Ltd ロッキング機構、及び椅子
WO2010097818A1 (en) * 2009-02-25 2010-09-02 Donati S.P.A. Device for synchronizing the tilt of a chair back and seat
JP5443301B2 (ja) * 2010-08-31 2014-03-19 株式会社岡村製作所 椅子
JP5133382B2 (ja) * 2010-08-31 2013-01-30 株式会社岡村製作所 椅子
TWI685317B (zh) * 2016-10-07 2020-02-21 堡勝企業股份有限公司 椅背緩衝調整裝置及具有椅背緩衝調整裝置的椅子
DE102017208151A1 (de) * 2016-10-24 2018-04-26 Stabilus Gmbh Stellvorrichtung zur Betätigung einer Bremse und mobile Einheit, insbesondere Stuhl
CN107041645A (zh) * 2017-04-25 2017-08-15 安徽庆睿实业有限责任公司 智能保健办公椅

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITTO980034A1 (it) * 1998-01-16 1999-07-16 Miotto Int Comp Dispositivo meccanico per il controllo della movimentazione sincrona d i sedile e schienale di una seduta.
WO2000022959A1 (de) * 1998-10-20 2000-04-27 Protoned B.V. Stuhlmechanik

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7243993B2 (en) * 2002-07-23 2007-07-17 Okamura Corporation Tilting mechanism for a chair and a chair having the same
US20090242700A1 (en) * 2006-05-11 2009-10-01 Patrick Raymond Seat
US8157326B2 (en) * 2006-05-11 2012-04-17 Tech-Nicon International Management Services Limited Seat
KR20130038121A (ko) * 2010-02-26 2013-04-17 도나티 에스.피.에이. 의자의 시트와 등받이를 동기화하는 장치
KR101661949B1 (ko) * 2010-02-26 2016-10-04 도나티 에스.피.에이. 의자의 시트와 등받이를 동기화하는 장치
US10231545B2 (en) * 2015-10-15 2019-03-19 Co.Fe.Mo. Industrie S.R.L. Oscillation mechanism for chairs
US10813458B2 (en) 2016-07-08 2020-10-27 Co.Fe.Mo. Industrie S.R.L. Tilting mechanism for chairs
US11109683B2 (en) 2019-02-21 2021-09-07 Steelcase Inc. Body support assembly and method for the use and assembly thereof
US11602223B2 (en) 2019-02-21 2023-03-14 Steelcase Inc. Body support assembly and methods for the use and assembly thereof
US11910934B2 (en) 2019-02-21 2024-02-27 Steelcase Inc. Body support assembly and methods for the 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
US11786039B2 (en) 2019-12-13 2023-10-17 Steelcase Inc. Body support assembly and methods for the use and assembly thereof
US11805913B2 (en) 2019-12-13 2023-11-07 Steelcase Inc. Body support assembly and methods for the use and assembly thereof
US11478082B2 (en) 2020-12-22 2022-10-25 Barbara Gervais Care chair

Also Published As

Publication number Publication date
JP2002010852A (ja) 2002-01-15
ITTO20000538A0 (it) 2000-06-06
ITTO20000538A1 (it) 2001-12-06
IT1320403B1 (it) 2003-11-26
EP1161904A1 (en) 2001-12-12
CN1327781A (zh) 2001-12-26

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AS Assignment

Owner name: PRO CORD SPA, ITALY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:PIRETTI, GIANCARLO;REEL/FRAME:011878/0022

Effective date: 20010523

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION