EP0284272A1 - Stuhl - Google Patents

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Publication number
EP0284272A1
EP0284272A1 EP88302240A EP88302240A EP0284272A1 EP 0284272 A1 EP0284272 A1 EP 0284272A1 EP 88302240 A EP88302240 A EP 88302240A EP 88302240 A EP88302240 A EP 88302240A EP 0284272 A1 EP0284272 A1 EP 0284272A1
Authority
EP
European Patent Office
Prior art keywords
seat
base
mounting member
mounting
mounting members
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Withdrawn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
EP88302240A
Other languages
English (en)
French (fr)
Inventor
Keith Martin Rowbottom
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.)
MINES AND WEST GROUP Ltd
Original Assignee
MINES AND WEST GROUP Ltd
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 MINES AND WEST GROUP Ltd filed Critical MINES AND WEST GROUP Ltd
Publication of EP0284272A1 publication Critical patent/EP0284272A1/de
Withdrawn legal-status Critical Current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
    • 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
    • A47C7/445—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame with bar or leaf springs
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C3/00—Chairs characterised by structural features; Chairs or stools with rotatable or vertically-adjustable seats
    • A47C3/02—Rocking chairs
    • A47C3/025—Rocking chairs with seat, or seat and back-rest unit elastically or pivotally mounted in a rigid base frame
    • A47C3/026—Rocking chairs with seat, or seat and back-rest unit elastically or pivotally mounted in a rigid base frame with central column, e.g. rocking office chairs; Tilting chairs
    • 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

Definitions

  • the present invention relates to improvements in chairs and to mechanisms for connecting a chair seat to a base for permitting tilting of the seat relative to the base.
  • a mechanism for connecting a chair seat to a base for permitting tilting of the seat relative to the base comprising a body having a portion adapted for attachment to the base, mounting means comprising a mounting member extending from said body and having a portion adapted for attachment to the seat, pivot means pivotally connecting said mounting member to said body for pivotal movement of said mounting member relative to said body about the axis of said pivot means between first and second limit positions for, in use, permitting tilting of the seat relative to the base, and biasing means for biasing said mounting member about said pivot axis towards one of said limit positions, said pivot axis being positioned between said attachment portions of said mounting member and of said body.
  • the mounting member may extend from the body generally perpendicularly to the pivot axis and the biasing means may be arranged to act between the mounting member and the body to bias the mounting member towards the one limit position.
  • the biasing means may for example comprise a generally elongate leaf spring means which may be substantially unstressed in the one limit position.
  • the biasing means may extend generally parallel to the mounting member and one end portion may be fixed to one of the mounting member and the body, the other end portion bearing on the other of the body and the mounting member. Preferably the other end portion of the biasing means bears on the body.
  • the mechanism preferably comprises a plurality of mounting members extending generally parallel to each other and perpendicular to the pivot axis.
  • the mounting members may be independently pivotally mounted on the body and the biasing means may be arranged between a pair of adjacent members.
  • the mounting members may be fixed relative to each other by a trans­versely extending member to which the one end portion of the biasing means may also be fixed, the transversely extending member either forming part of the seat or seat frame or forming part of the mounting means to be fixed to the seat or seat frame.
  • a chair comprising a seat, a base and a mechanism as described above.
  • the body of the mechanism is attached to the base with the or each mounting member extending from the body in the direction of the front of the seat to which it is attached.
  • the pivot axis extends generally parallel to the front of the seat and is located between the front of the seat and the portion of the body attached to the base.
  • the seat comprises a portion which extends from the front of the seat downwardly and rearwardly, the mounting means being fixed to the extension portion of the seat so that the seat is cantilevered on the base.
  • the chair shown in Figure 1 comprises a base 1, a seat 4 and a mechanism 7 for connecting the seat to the base to permit tilting of the seat on the base.
  • the base 1 comprises a ground support portion 2 and an upwardly extending support member 3.
  • the seat 4 comprises a seating portion, a backrest portion and a downwardly and rearwardly extending portion extending from the front edge of the seating portion and to which the mechanism is connected so that the seat 4 is in effect cantilevered on the base 1.
  • the seat may, as shown, comprise a frame 5 provided with rigid or resilient elements 6 a which may be covered by upholstery as indicated by the dotted line 6 b in Figure 1.
  • the frame 5 of the seat comprises a pair of tubular members 5 a ,5 b which extend laterally of the seating portion and backrest portion and are inter­connected by the transverse elements 6 a at appropriate intervals along their length.
  • frame members 5 a ,5 b extend downwardly and then rearwardly to create the downwardly and rearwardly extending portion of the seat, and at their ends are connected by a pair of transversely extending members 5 d which may form part of the frame 5 and/or of the mechanism 7.
  • the mechanism 7 is shown in greater detail in Figures 2 to 4 and comprises a body 7 a for attachment to the base and mounting means 7 b for attachment to the seat, the mounting means 7 b being pivotally connected to the body 7 a .
  • the body 7 a comprises a generally triangular base plate 10 having a portion adapted for attachment to the base. As shown, the portion is located at one apex of the triangle of the base plate 10 and comprises an opening 11 surrounded by a collar 12 for receiving the upper end of the support member 3 of the base. As shown, the collar 12 defines a generally frusto-conical opening, the upper end of the support member 3 being correspondingly frusto-conical.
  • the mounting means 7 b comprise a plurality of, as shown two, mounting members or arms 17 extending from the body 7 a generally parallel to each other.
  • the arms 17 are pivotally mounted on the base plate 10 for pivotal movement about an axis 16 extending generally perpendicular to the arms 17 and are fixed relative to each other and to the seat by the transversely extending members 5 d to which end portions of arms 17 are fixed by, for example, welding, bolting or riveting.
  • the mounting arms are independently pivotally mounted on the base plate and, to this end, in the regions of the other two apices of the triangle of the base plate, two pairs of upstanding generally parallel walls 13,14 are provided, the walls 13,14 being apertured and receiving opposite ends of pivot pins 15 on which the arms 17 are mounted. Spacers 18 are provided on the pins 15 for correct location of the arms 17.
  • the pivot pins 15 are coaxial and together define pivot axis 16 which in use of the mechanism and, as shown, is positioned between the portion of the plate 10 by which it is attached to the base and the portions of the arms 17 by which they are attached to the seat.
  • the extent of pivotal movement of the arms 17 and the seat 4 relative to the base plate 10 and base 1 is determined by stops 19 and 20 mounted between the walls 13 and 14 above and below a projecting portion 21 of each mounting arm 17.
  • the stops define first and second limit positions as shown in Figures 3 and 4.
  • the mechanism also includes biasing means for biasing the mounting arm 17 and seat 4 towards one of the limit positions and providing a bias against move­ment towards the other limit position.
  • the biasing means may be provided by torsion means associated with, or in place of, the pivot pins 15, or by tension or compression springs acting between the arms 17 and base plate 10.
  • the bias is provided by a leaf spring assembly 22 which acts between the arms 17 and the base plate 10.
  • the assembly 22 comprises a plurality of generally elongate leaf springs which are arranged between the mounting arms 17 with one end of the leaf spring assembly being fixed, e.g.
  • the bias adjusting means is operative to vary the spacing between the other end of the spring assembly and the base plate 10 and comprises a bar 23 on which the leaf spring assembly bears and which extends across the base plate 10 and is carried by a pin 24.
  • the pin 24 is threadedly engaged in the bar 23, extends through the base plate 10 and is held axially fast relative to the base plate 10 by a circlip or flange 26.
  • the end of the pin emerging below the base plate 10 is provided with a manually engageable knob 25 for rotation of the pin in the bar 23.
  • the mechanism is arranged so that, when the chair is not in use, the spring assembly 22 maintains the seat in the limit position shown in Figure 3 with the seating portion of the seat inclined slightly forwardly. In this condition, the spring assembly is substantially unstressed and is then stressed as the seating portion is tilted rearwardly by the user to the other limit position shown in Figure 4. Rearward tilting of the seat is achieved by the user leaning back in the seat to transfer his centre of gravity rearwardly.
  • the bias provided by the leaf spring assembly is adjusted by the user, by operation of knob 25, in dependence on the weight of the user of the chair, to ensure that the chair will tilt rearwardly as and when required.
  • the leaf spring assembly 22 is arranged so that the pivot axis 16 extends through the leaf spring assembly in substantially all relative positions of the seat and base permitted by the mechanism.
  • the mechanism is shown as comprising two mounting arms 17, it will be appreciated that one or more than two mounting arms may be employed.
  • the above described mechanism may be used with other constructions of the seat 4 than that as shown with a peripheral frame.
  • the seat 4 may be provided by a frameless seat, for example moulded of a suitable plastics material which may then be upholstered and it or elements connected to it may provide the downwardly and rearwardly extending extension portion to which the mounting means of the mechanism are attached so that the seat is in effect cantilevered on the base.

Landscapes

  • Chairs Characterized By Structure (AREA)
EP88302240A 1987-03-23 1988-03-15 Stuhl Withdrawn EP0284272A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB878706806A GB8706806D0 (en) 1987-03-23 1987-03-23 Chairs
GB8706806 1987-03-23

Publications (1)

Publication Number Publication Date
EP0284272A1 true EP0284272A1 (de) 1988-09-28

Family

ID=10614432

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88302240A Withdrawn EP0284272A1 (de) 1987-03-23 1988-03-15 Stuhl

Country Status (2)

Country Link
EP (1) EP0284272A1 (de)
GB (1) GB8706806D0 (de)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991014385A1 (de) * 1990-03-28 1991-10-03 Fritz Hansen Eft. A/S Sitzmechanik
DE4410383A1 (de) * 1994-03-25 1995-09-28 Simon Klinksiek Stuhl
US6367876B2 (en) 1998-01-21 2002-04-09 Herman Miller, Inc. Chair
US6729688B2 (en) * 2000-03-24 2004-05-04 Giroflex-Entwicklungs-Ag Seat and backseat assembly for seating, in particular office chairs
US8262162B2 (en) 2007-01-29 2012-09-11 Herman Miller, Inc. Biasing mechanism for a seating structure and methods for the use thereof
USD703988S1 (en) 2013-06-07 2014-05-06 Steelcase Inc. Chair
USD703987S1 (en) 2013-06-07 2014-05-06 Steelcase Inc. Chair
USD704487S1 (en) 2013-06-07 2014-05-13 Steelcase Inc. Chair
USD706547S1 (en) 2013-06-07 2014-06-10 Steelcase Inc. Chair
USD707976S1 (en) 2013-06-07 2014-07-01 Steelcase Inc. Chair
USD721529S1 (en) 2013-06-07 2015-01-27 Steelcase Inc. Handle apparatus
US11096497B2 (en) 2015-04-13 2021-08-24 Steelcase Inc. Seating arrangement
US11109683B2 (en) 2019-02-21 2021-09-07 Steelcase Inc. Body support assembly and method for the use and assembly thereof
US11259637B2 (en) 2015-04-13 2022-03-01 Steelcase Inc. Seating arrangement
US11324325B2 (en) 2015-04-13 2022-05-10 Steelcase Inc. Seating arrangement
US11357329B2 (en) 2019-12-13 2022-06-14 Steelcase Inc. Body support assembly and methods for the use and assembly thereof
US11617444B2 (en) 2020-03-02 2023-04-04 Steelcase Inc. Body support assembly and methods for the use and assembly thereof
US11812870B2 (en) 2021-02-10 2023-11-14 Steelcase Inc. Body support structure

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB154061A (en) * 1919-11-08 1920-11-25 Alfred Howlett Improvements in or relating to tilting chairs
US3070342A (en) * 1959-04-23 1962-12-25 Middletown Mfg Company Rocking chair with declining legs
FR2267068A1 (en) * 1974-04-09 1975-11-07 Carmet Tilt mechanism with lock for armchairs - incorporates leaf springs in housing on which it is column-mounted
US4529247A (en) * 1982-04-15 1985-07-16 Herman Miller, Inc. One-piece shell chair

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB154061A (en) * 1919-11-08 1920-11-25 Alfred Howlett Improvements in or relating to tilting chairs
US3070342A (en) * 1959-04-23 1962-12-25 Middletown Mfg Company Rocking chair with declining legs
FR2267068A1 (en) * 1974-04-09 1975-11-07 Carmet Tilt mechanism with lock for armchairs - incorporates leaf springs in housing on which it is column-mounted
US4529247A (en) * 1982-04-15 1985-07-16 Herman Miller, Inc. One-piece shell chair

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991014385A1 (de) * 1990-03-28 1991-10-03 Fritz Hansen Eft. A/S Sitzmechanik
US5356199A (en) * 1990-03-28 1994-10-18 Fritz Hansen A/S Mechanism for mounting the seat of a swivel chair on a chair frame
DE4410383A1 (de) * 1994-03-25 1995-09-28 Simon Klinksiek Stuhl
US5664835A (en) * 1994-03-25 1997-09-09 Peter Roeder Chair
US6367876B2 (en) 1998-01-21 2002-04-09 Herman Miller, Inc. Chair
US6729688B2 (en) * 2000-03-24 2004-05-04 Giroflex-Entwicklungs-Ag Seat and backseat assembly for seating, in particular office chairs
US8262162B2 (en) 2007-01-29 2012-09-11 Herman Miller, Inc. Biasing mechanism for a seating structure and methods for the use thereof
USD721529S1 (en) 2013-06-07 2015-01-27 Steelcase Inc. Handle apparatus
USD703987S1 (en) 2013-06-07 2014-05-06 Steelcase Inc. Chair
USD704487S1 (en) 2013-06-07 2014-05-13 Steelcase Inc. Chair
USD706547S1 (en) 2013-06-07 2014-06-10 Steelcase Inc. Chair
USD707976S1 (en) 2013-06-07 2014-07-01 Steelcase Inc. Chair
USD703988S1 (en) 2013-06-07 2014-05-06 Steelcase Inc. Chair
US11324325B2 (en) 2015-04-13 2022-05-10 Steelcase Inc. Seating arrangement
US11259637B2 (en) 2015-04-13 2022-03-01 Steelcase Inc. Seating arrangement
US11096497B2 (en) 2015-04-13 2021-08-24 Steelcase Inc. Seating arrangement
US11553797B2 (en) 2015-04-13 2023-01-17 Steelcase Inc. Seating arrangement
US11963621B2 (en) 2015-04-13 2024-04-23 Steelcase Inc. Seating arrangement
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
US11617444B2 (en) 2020-03-02 2023-04-04 Steelcase Inc. Body support assembly and methods for the use and assembly thereof
US11812870B2 (en) 2021-02-10 2023-11-14 Steelcase Inc. Body support structure

Also Published As

Publication number Publication date
GB8706806D0 (en) 1987-04-29

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