EP0228992B1 - Arbeitsstuhl, insbesondere Bürostuhl - Google Patents

Arbeitsstuhl, insbesondere Bürostuhl Download PDF

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Publication number
EP0228992B1
EP0228992B1 EP86810525A EP86810525A EP0228992B1 EP 0228992 B1 EP0228992 B1 EP 0228992B1 EP 86810525 A EP86810525 A EP 86810525A EP 86810525 A EP86810525 A EP 86810525A EP 0228992 B1 EP0228992 B1 EP 0228992B1
Authority
EP
European Patent Office
Prior art keywords
backrest
chair
support
cam
seat
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
EP86810525A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0228992A3 (en
EP0228992A2 (de
Inventor
Peter Tobler
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.)
Provenda Marketing AG
Original Assignee
Provenda Marketing AG
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 Provenda Marketing AG filed Critical Provenda Marketing AG
Priority to AT86810525T priority Critical patent/ATE54044T1/de
Publication of EP0228992A2 publication Critical patent/EP0228992A2/de
Publication of EP0228992A3 publication Critical patent/EP0228992A3/de
Application granted granted Critical
Publication of EP0228992B1 publication Critical patent/EP0228992B1/de
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
    • A47C1/03255—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
    • A47C1/03238—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

Definitions

  • the invention relates to a work chair, in particular an office chair, with a seat support, a seat, a backrest support, a backrest and a synchronizing mechanism for moving the backrest support and seat support relative to one another, and a spring, against the force which the backrest can be pivoted backwards, blocking means are provided to block the backrest support and seat support in any position.
  • a work chair is described in EP-A-0 001 846.
  • the backrest can be blocked in various positions by actuating the blocking means. In this blocked state, it is impossible to pivot the backrest both to and from the rear. If, on the other hand, the blocking agents are unblocked, swinging, dynamic sitting is possible.
  • the backrest moves to its foremost position under the action of the spring. If the user sits down again in the chair, he usually has to move the backrest a little more or less back into the usual working position, depending on his physique, in order to then lock it in this position. This is often perceived as uncomfortable by the user, especially if he has not reached the most comfortable position at first go, only realizes this after a while and has to correct it once or even several times.
  • US-A-4 099 775 shows a chair with a seat support, a seat plate hinged to the seat support and a backrest support rigidly connected to the seat plate via the armrests.
  • a torsion spring strives to pivot the seat with the backrest support so that the backrest is moved from a rear inclined position to a practically vertical position.
  • a frame is provided at the bottom of the seat plate for mounting the tilt lock.
  • the adjustable stop is formed by a curve with a large number of teeth. The curve can be rotated by a button located on the side of the frame to bring a tooth into engagement with an edge of the seat support.
  • the inclination lock has an adjustable stop, by means of which the foremost position of the backrest support can be adjusted according to the needs of the user.
  • This has the advantage that the user of the chair does not always have to look for the most favorable working position after rocking the chair. Rather, the chair automatically returns to the working position once it has been rocked. The work situation can, however, be reset by any user. It may be surprising that, despite the efforts in the field of chair construction demonstrated by the diverse state of the art, no solution to the problem described has yet been found. However, the problem was probably not recognized at all or the effort to solve the problem was considered too great. However, the present invention solves the problem posed with minimal effort.
  • the adjustable stop is advantageously formed by a curve and a locking element is arranged at the bottom of the seat plate, which engages the curve when the user does not exert sufficient force on the backrest to pivot the backrest support backwards.
  • the latter is particularly the case when the curve is designed as a cam disk that can be rotated about an axis.
  • the curve or cam is expediently provided with a plurality of teeth into which the locking member can snap. This ensures a clearly defined position of the backrest support in the foremost position.
  • the cam disc can be connected to a setting wheel segment which projects through an opening in the backrest support. This enables one simple operation by the user. He sits in the chair and with his back presses the backrest into the desired position and then turns the adjusting wheel segment until a tooth strikes the locking element. The desired front position of the backrest support is thus determined until the same or another user of the chair wants to change it again.
  • the adjusting wheel segment advantageously has a stop pin at each end, by means of which the two end positions of the cam disc are fixed when striking the backrest support. This results in a particularly simple construction of the stop, with only a few parts being required.
  • the spring, against which force the backrest support can be pivoted backwards is advantageously a gas spring, means being provided to block the gas spring in any position.
  • a gas spring means being provided to block the gas spring in any position.
  • the adjustable stop according to the invention enables the working position to be precisely determined, but not to a rearward blocking of the backrest support.
  • the combination of stop and gas spring enables the user to determine the desired normal working position on the one hand, but on the other hand to block the backrest support in any position, i.e. also in the normal working position, not only to the front but also to prevent it from moving backwards.
  • the gas spring acts not only as a blocking device but also as a spring.
  • the work chair shown in Figure 1 consists essentially of the base II, the standpipe 13, the seat support 15, the seat plate 17 with the seat cushion 19 and the backrest support 23 articulated on the seat plate 17 by means of the axis of rotation 21 with the backrest cushion 25 thereby a so-called synchronous chair, in which the seat 19 also inclines when the backrest 25 is inclined, namely about half as much as the backrest 25.
  • the seat plate 17 is pivotally mounted on the seat support 15 with an elastic connecting plate 27.
  • the seat support 17 is pivotally connected to the backrest support 23 with the axis of rotation 21.
  • a connecting lever 29 is arranged on each side of the backrest support 23, which is designed in the form of a shell in the lower region and which represents an articulated connection between the seat support 25 and the backrest support 23. The articulation of the connecting lever 29 takes place via the axes of rotation 31 and 33.
  • a gas spring 32 is mounted at 33 and 35 and in the unlocked state exerts a force which tends to press the backrest 25 into the foremost position. An adjustment lever with which the gas spring can be blocked and unblocked cannot be seen from the drawing.
  • the gas spring has, as is usual with work chairs, not only the function of a spring, but also the function of a tilt lock.
  • a mechanical spring e.g. a coil spring may be provided, but then such a spring would not cause a tilt lock. It would then be possible, however, to additionally provide a mechanical inclination lock, as described, for example, in EP-A-0 001 846 described at the beginning.
  • it is precisely one advantage of the present invention that, under certain circumstances, it is also possible to dispense with such a double-acting inclination lock because it itself represents a single-acting, ie only one-way, tilt lock.
  • the stop 37 shown in more detail in FIG. 3 serves as such a single-acting tilt lock.
  • this stop 37 is arranged between the backrest support 23 and the seat plate 17.
  • the adjustable stop 37 forms a cam disc with a large number of teeth 39, in which a latching element 41 arranged on the seat plate 17 can engage.
  • the cam disc 37 is rotatably supported about the axis 43.
  • An adjusting wheel segment 45 which projects outwards through an opening 47 in the backrest support 23, serves to adjust the cam disk 37.
  • the setting wheel segment has a stop pin 49 on each side, by means of which the two end positions of the cam plate 37 are fixed when struck on the backrest support 23.
  • the axis 43 is mounted in the backrest support 23.
  • the backrest support 23 is advantageously made of die-cast aluminum.
  • the user In order to bring the backrest 25 into the desired working position, the user sits in the chair and presses his back against the backrest 25 until it is in the desired position.
  • the adjusting wheel segment 45 is then rotated counterclockwise until a tooth 39 strikes the locking member 41.
  • the desired front position of the backrest support 23 is thus established. If a change - this position is desired, the user pushes the backrest 25 further back, so that the locking member 41 from the cure ve 37 is lifted and the setting wheel segment 45 is released for a new setting.
  • the present invention is particularly advantageous for synchronous chairs because it can utilize the relative movement between the backrest support and seat plate or seat plate and seat support for a simple and cheap construction.
  • the invention is not limited to synchronous chairs.

Landscapes

  • Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Chairs For Special Purposes, Such As Reclining Chairs (AREA)
  • Plural Heterocyclic Compounds (AREA)
  • Exchange Systems With Centralized Control (AREA)
  • Chairs Characterized By Structure (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
EP86810525A 1986-01-07 1986-11-17 Arbeitsstuhl, insbesondere Bürostuhl Expired - Lifetime EP0228992B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86810525T ATE54044T1 (de) 1986-01-07 1986-11-17 Arbeitsstuhl, insbesondere buerostuhl.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH20/86A CH668541A5 (de) 1986-01-07 1986-01-07 Arbeitsstuhl, insbesondere zur verwendung als buerostuhl.
CH20/86 1986-01-07

Publications (3)

Publication Number Publication Date
EP0228992A2 EP0228992A2 (de) 1987-07-15
EP0228992A3 EP0228992A3 (en) 1987-12-16
EP0228992B1 true EP0228992B1 (de) 1990-06-27

Family

ID=4177563

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86810525A Expired - Lifetime EP0228992B1 (de) 1986-01-07 1986-11-17 Arbeitsstuhl, insbesondere Bürostuhl

Country Status (7)

Country Link
US (1) US4763950A (da)
EP (1) EP0228992B1 (da)
AT (1) ATE54044T1 (da)
CH (1) CH668541A5 (da)
DE (1) DE3672190D1 (da)
DK (1) DK7587A (da)
NO (1) NO864846L (da)

Families Citing this family (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1219314B (it) * 1988-05-18 1990-05-03 Pro Cord Srl Sedia con sedile oscillante
US4854641A (en) * 1989-01-23 1989-08-08 Reineman Richard G Adjustable chair
US5018787A (en) * 1990-06-20 1991-05-28 Shepherd Products U.S. Inc. Chair seat tilt control
NO174135C (no) * 1990-09-05 1994-03-23 Staal & Stil As Arbeidsstol
DE69334200T2 (de) 1992-06-15 2008-12-24 Herman Miller, Inc., Zeeland Rückenlehne für einen Stuhl
EP0698358A3 (en) * 1994-08-17 1996-06-19 Ashfield Eng Co Wexford Ltd Tilt mechanism for a chair
US6139103A (en) * 1997-03-12 2000-10-31 Leggett & Platt, Inc. Synchronized chair seat and backrest tilt control mechanism
US5979984A (en) * 1997-10-24 1999-11-09 Steelcase Development Inc. Synchrotilt chair with forwardly movable seat
US6250715B1 (en) * 1998-01-21 2001-06-26 Herman Miller, Inc. Chair
EP1211966B1 (en) * 1998-09-18 2006-06-14 Rbm A/S Ergonomic chair
US6582019B2 (en) 2000-03-17 2003-06-24 Herman Miller, Inc. Tilt assembly for a chair
DE10194640B4 (de) * 2000-10-16 2008-03-27 Kokuyo Co., Ltd. Stuhl
US6616231B2 (en) * 2001-06-15 2003-09-09 Hon Technology Inc. Multi-position tilt-limiting mechanism
US7396082B2 (en) * 2002-03-29 2008-07-08 Garrex Llc Task chair
US7165811B2 (en) * 2002-09-12 2007-01-23 Steelcase Development Corporation Control mechanism for seating unit
DE10309921A1 (de) * 2003-03-07 2004-09-16 Dauphin Entwicklungs- Und Beteiligungs-Gmbh Stuhl, insbesondere Bürostuhl
US6840578B1 (en) * 2003-09-16 2005-01-11 Wen-Fa Su Chair improvement structure
US6942080B2 (en) * 2003-12-04 2005-09-13 Tsann Kuen Enterprise Co., Ltd. Electrical appliance having a wire winding device
US7237841B2 (en) 2004-06-10 2007-07-03 Steelcase Development Corporation Back construction with flexible lumbar
US7458637B2 (en) 2004-06-10 2008-12-02 Steelcase Inc. Back construction with flexible lumbar
US7857390B2 (en) * 2006-03-24 2010-12-28 Herman Miller, Inc. Piece of furniture
US7766426B2 (en) * 2006-08-29 2010-08-03 Ram Machines (1990) Ltd. Tilt controls for chairs
US7753447B2 (en) * 2006-10-13 2010-07-13 L&P Property Management Company Casual control tilt lockout
CN102772053A (zh) 2007-01-29 2012-11-14 赫尔曼米勒有限公司 座位结构及其使用方法
JP4435215B2 (ja) * 2007-07-19 2010-03-17 三洋電機株式会社 椅子型マッサージ機
EP2200479B1 (en) * 2007-09-20 2015-06-17 Herman Miller, Inc. Body support structure
US20150173515A1 (en) * 2013-12-23 2015-06-25 Freedman Seats Ltd Seat
DE102016104638A1 (de) * 2016-03-14 2017-09-14 Burkhard Schmitz Stuhl
US11589678B2 (en) 2019-01-17 2023-02-28 Hni Technologies Inc. Chairs including flexible frames

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1359145A (en) * 1919-05-22 1920-11-16 Milwaukee Chair Company Chair
US1368469A (en) * 1919-11-15 1921-02-15 Harry A Atwood Chair
FR645280A (fr) * 1927-11-15 1928-10-23 Siège suspendu à éléments articulés réglables
US2139028A (en) * 1937-09-29 1938-12-06 Elizabeth M Mensendicck Seat
US2321385A (en) * 1941-06-16 1943-06-08 Sikes Company Tilting chair
DE1220268B (de) * 1957-07-26 1966-06-30 Daimler Benz Ag In eine Liege umwandelbarer Fahrzeugsitz, insbesondere fuer Kraftfahrzeuge
US4099775A (en) * 1976-10-07 1978-07-11 Hoover Ball And Bearing Company Chair control with tilt lock
DE2733322C3 (de) * 1977-07-23 1980-08-07 Protoned B.V., Amsterdam Arbeitsstuhl
DE2748680A1 (de) 1977-10-29 1979-05-10 Stoll Kg Christof Neigungsvorrichtung fuer sitzmoebel
CH659179A5 (en) * 1983-05-06 1987-01-15 Provenda Marketing Ag Working chair, especially an office chair
JPS60117742U (ja) * 1984-01-18 1985-08-09 株式会社岡村製作所 椅子のリクライニング装置

Also Published As

Publication number Publication date
ATE54044T1 (de) 1990-07-15
DK7587A (da) 1987-07-08
EP0228992A3 (en) 1987-12-16
DE3672190D1 (de) 1990-08-02
EP0228992A2 (de) 1987-07-15
US4763950A (en) 1988-08-16
NO864846L (no) 1987-07-08
CH668541A5 (de) 1989-01-13
NO864846D0 (no) 1986-12-02
DK7587D0 (da) 1987-01-07

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