EP1197167A2 - Mécanisme à bascule pour chaise et chaise munie de ce mécanisme - Google Patents

Mécanisme à bascule pour chaise et chaise munie de ce mécanisme Download PDF

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Publication number
EP1197167A2
EP1197167A2 EP01308492A EP01308492A EP1197167A2 EP 1197167 A2 EP1197167 A2 EP 1197167A2 EP 01308492 A EP01308492 A EP 01308492A EP 01308492 A EP01308492 A EP 01308492A EP 1197167 A2 EP1197167 A2 EP 1197167A2
Authority
EP
European Patent Office
Prior art keywords
chair
support
mechanism support
pivot
resilient
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Withdrawn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
EP01308492A
Other languages
German (de)
English (en)
Other versions
EP1197167A3 (fr
Inventor
Ian Howell
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.)
Rodd Engineering Ltd
Original Assignee
Rodd Engineering 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 Rodd Engineering Ltd filed Critical Rodd Engineering Ltd
Publication of EP1197167A2 publication Critical patent/EP1197167A2/fr
Publication of EP1197167A3 publication Critical patent/EP1197167A3/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Withdrawn legal-status Critical Current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
    • A47C1/03261—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
    • A47C1/03288—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with resilient blocks

Definitions

  • This invention relates to a chair tilting mechanism and to a chair incorporating such a mechanism.
  • Chairs of this type provide for tilting of the seat of the chair and for tilting of the back and are frequently employed in office chairs.
  • UK Patent GB 2 264 862 shows such a mechanism which employs a fixed support, a seat support pivotally connected to the fixed support by a pivot, a back rest support and a bias means connected between at least two of the supports to provide bias during tilting.
  • the back rest support is pivotally connected to the fixed support of the pivot and to a seat support by a connector which allows both rotation and translational movement, the connector being located rearwardly of the pivot between the back rest and the fixed supports.
  • the pivot between the seat and the fixed supports is located forwardly of the pivot between the back rest and the fixed supports and the bias means act between the seat and fixed supports forwardly of the pivot between the seat and the fixed supports.
  • the bias means are in the form of a compression spring mounted at the front of the seat and locking means are provided.
  • the present invention is intended to provide a chair tilt mechanism which is easier to construct and is less expensive to manufacture. It is also intended to provide a neater construction which is visually more attractive.
  • a chair tilt mechanism comprises a mechanism support adapted for connection to the seat of a chair and including first means for connection to a chair base and which are pivoted to said mechanism support, second means for connection to a chair back support pivoted to said first means and resilient biasing means which extend between the pivot between the first and second means and the mechanism support, movement of the mechanism support against the biasing causing relative angular movement between the first and second means and relative angular movement of the mechanism support about the pivot between the first means and the mechanism support.
  • first and second means are provided respectively by the arms of a toggle joint, said resilient biasing means acting on the joint pivot.
  • the resilient biasing means can be provided by a block or blocks of resilient material, for example rubber or a synthetic polymeric material.
  • a block or blocks of resilient material for example rubber or a synthetic polymeric material.
  • the block or blocks of resilient material are preferably deformed from an initial shape during installation so that they are pre-stressed when in position ready for use.
  • means for locking the mechanism support to the first means can be provided.
  • the invention also includes a chair incorporating the tilt mechanism set forth above.
  • the chair tilt mechanism comprises a channel shaped mechanism support 1, the upper edges of the channel being provided with flanges 2 for attachment to the lower part of the seat 3 of a chair with which it is to be used. Openings 4 are provided in the flanges to allow them to be secured to the seat 3.
  • Located in the mechanism support 1 are first means in the form of a fabricated arm 5 which is carried on a pivot pin 6 which extends between the spaced apart sides 7 of the channel shaped mechanism support 1.
  • This arm 5 is fabricated from an upper channel shaped member 8 which is located within a lower channel shaped member 9 to which it is secured by welding or the like.
  • Extending between the two members 8 and 9 is a tube 10 which is dimensioned to accept the column 11 of a chair base 12 which is provided with castors 13.
  • the upper channel shaped member 8 has an extension 15 which can engage a pin 16 which also extends between the sides 7 of the mechanism support 1 and which acts as a stop against downward angular movement of the mechanism support about the pivot 6.
  • Second means for connection to a chair back support are provided by a channel shaped arm 20 which is pivoted to the lower member 9 by a pivot pin 21.
  • the arm 20 is dimensioned to fit within the walls 22 of the lower member 9 and the pivot pin 21 extends between these walls and through suitable openings in the arm 20.
  • the mechanism support 1 carries upper and lower guides provided by pins 23, 24 which extend between the walls 7 and which are spaced apart to allow the arm 20 to move longitudinally and rotationally between them.
  • the chair back support 25 is connected to the arm 20, for example by suitable nuts and bolts.
  • Resilient biasing means are provided which extend between the pivot 21 between the first and second means and the mechanism support 1. These biasing means are provided by a block 29 of resilient material, for example rubber or a synthetic polymeric material. The lower end of the block is shaped to engage a W-shaped stiffener 30 which rests against the pivot pin 21 and the upper end of the block 29 is held in place by a retainer 31, the shape of which is most clearly shown in Figure 3.
  • the retainer comprises a pair of side channels 32 and a domed central portion 33. The domed central portion acts on the block 29 and the retainer 31 is held in place in the mechanism support 1 by a pair of spaced apart pins 34 which act against the channels 32 and restrain the retainer from upward movement, at the same time acting to compress the block 29.
  • the resilient biasing means provided by the block 29 extend between the pivot pin 21 between the first and second means and the mechanism support 1 through the pins 34. Movement of the mechanism support against the biasing causes relative angular movement between the first and second means provided by the arms 5 and 20 and relative angular movement about the pivot 6 between the first means, in the form of the arm 5, and the mechanism support 1.
  • the first means in the form of the arm 5 and the second means in the form of the arm 20 provide respectively the arms of a toggle joint and the resilient biasing means 28 act on the joint pivot 21.
  • Tilting of the seat against the resilient biasing means can be achieved by the user as required.
  • Figure 5 shows means for locking the mechanism in a desired position and comprises a bracket 38 carried by a pair of pins 39 which extend between the side walls 7 of the mechanism support 1, the bracket is thus rigidly held in position.
  • Extending from the bracket is a screw threaded column 40 which passes through an opening 41 in the extension 15 to a screw threaded adjustment knob 42. Axial adjustment of the knob 42 on the column 40 fixes the position of the extension 15 and thus the first arm 5 thus locking the mechanism in position.
  • knob 42 In order to allow free movement of the mechanism the knob 42 is moved to an axially displaced position which allows the free movement.
  • Means can be included for adjusting the height of the chair stem and these means can be of well-known type, for example Figure 2 shows a cranked adjustment spindle 50 which passes through an opening 51 which passes through the upper part of the lower member 9 and locates in an opening 52 on the other side. Rotation of the adjusting rod 50 causes the stem 11 to rise and fall in the tube 10.
  • Such adjustment mechanisms are well-known and it will not therefore be described further.
  • the resilient block or blocks could be replaced by some other form of biasing, for example a compression spring, but the use of a resilient block provides a simple and reliable construction.
  • FIGs 7, 8, 9 and 10 show an alternative construction in which similar reference numerals to those used in Figures 1 to 6 are employed to indicate similar parts.
  • the fabricated arm 5 is replaced by a fabricated arm 55 which has a lower channel member 9 similar to that of the previous construction but with an upper channel member 56 which extends transversely across the lower channel member 9.
  • This channel member 56 is secured to the lower channel member 9 by welding indicated by reference numeral 57.
  • the tube 10 extends between the members 56 and 9 in a similar manner to the tube shown in the previous construction.
  • the front bracing pin 16 between the sides 7 is a tube which is riveted over at its ends and the riveted pin 34 as shown in the earlier construction is replaced by a stepped pin 58 which retains one end of the spring plate 31. This allows for easier assembly.
  • the W-shaped stiffener 30 is not employed in this construction and the resilient biasing means 28 provided by the block 29 of resilient material has its lower angled faces 59 elongated, or moved further out from the main body portion, to allow the material (when loading) to bear on the channel shaped arm 20 indicated by reference numeral 60 in Figure 7. This spreads the load and prevents any tendency for the rubber block which forms the resilient means 28 splitting at its apex on the pivot pin 21 after an extended period of wear.
  • the lower part of the channel member now has a floor 61 which extends throughout its whole length and vertically upwards where indicated by reference numeral 62 which encloses the operating mechanism.

Landscapes

  • Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Chairs Characterized By Structure (AREA)
EP01308492A 2000-10-10 2001-10-04 Mécanisme à bascule pour chaise et chaise munie de ce mécanisme Withdrawn EP1197167A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0024840 2000-10-10
GBGB0024840.1A GB0024840D0 (en) 2000-10-10 2000-10-10 Chair tilting mechanism and a chair incorporating such a mechanism

Publications (2)

Publication Number Publication Date
EP1197167A2 true EP1197167A2 (fr) 2002-04-17
EP1197167A3 EP1197167A3 (fr) 2003-07-30

Family

ID=9901032

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01308492A Withdrawn EP1197167A3 (fr) 2000-10-10 2001-10-04 Mécanisme à bascule pour chaise et chaise munie de ce mécanisme

Country Status (7)

Country Link
US (1) US20020041118A1 (fr)
EP (1) EP1197167A3 (fr)
CN (1) CN1346615A (fr)
AU (1) AU7826101A (fr)
CA (1) CA2358358A1 (fr)
GB (1) GB0024840D0 (fr)
ZA (1) ZA200108143B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7566099B2 (en) 2003-10-22 2009-07-28 Lord Corporation Furniture seatback tilt recline angle limiter and method

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6969116B2 (en) * 2003-12-30 2005-11-29 Hni Technologies Inc. Chair with backward and forward passive tilt capabilities
WO2006094259A2 (fr) * 2005-03-01 2006-09-08 Haworth, Inc. Mecanisme de controle d'inclinaison d'un fauteuil
DE102006056928B3 (de) * 2006-12-04 2008-06-05 Sato Office Gmbh Sitz mit einer Sitzplatte und einer Rückenlehne
JP5220462B2 (ja) * 2008-04-01 2013-06-26 デルタ工業株式会社 シートのリクライニング装置
WO2015161281A1 (fr) 2014-04-17 2015-10-22 Hni Technologies Inc. Chaise et ensembles, systèmes et procédés de commande de chaise
US10194750B2 (en) 2015-04-13 2019-02-05 Steelcase Inc. Seating arrangement
US10966527B2 (en) 2017-06-09 2021-04-06 Steelcase Inc. Seating arrangement and method of construction
WO2016168185A1 (fr) 2015-04-13 2016-10-20 Steelcase Inc. Agencement de siège
US11259637B2 (en) 2015-04-13 2022-03-01 Steelcase Inc. Seating arrangement
EP4268676A3 (fr) 2019-02-21 2024-02-07 Steelcase Inc. Ensemble de support corporel et procédés d'utilisation et d'assemblage associés
US11357329B2 (en) 2019-12-13 2022-06-14 Steelcase Inc. Body support assembly and methods for the use and assembly thereof

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2264862A (en) 1992-03-10 1993-09-15 Ashfield Eng Co Wexford Ltd "a chair tilting mechanism"

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO159335C (no) * 1984-05-08 1988-12-21 Haag A S Laasbar vippemekanisme for stolsete eller lignende.
GB8825077D0 (en) * 1988-10-26 1988-11-30 Phr Furniture Ltd Pedestal chair
JP2596820Y2 (ja) * 1993-07-27 1999-06-21 株式会社内田洋行 椅 子

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2264862A (en) 1992-03-10 1993-09-15 Ashfield Eng Co Wexford Ltd "a chair tilting mechanism"

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7566099B2 (en) 2003-10-22 2009-07-28 Lord Corporation Furniture seatback tilt recline angle limiter and method
US8167375B2 (en) 2003-10-22 2012-05-01 Lord Corporation Furniture seatback tilt recline angle limiter and method

Also Published As

Publication number Publication date
US20020041118A1 (en) 2002-04-11
EP1197167A3 (fr) 2003-07-30
GB0024840D0 (en) 2000-11-22
CA2358358A1 (fr) 2002-04-10
ZA200108143B (en) 2002-06-26
CN1346615A (zh) 2002-05-01
AU7826101A (en) 2002-04-11

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