EP2491821A1 - Dossier pour chaise - Google Patents

Dossier pour chaise Download PDF

Info

Publication number
EP2491821A1
EP2491821A1 EP10824921A EP10824921A EP2491821A1 EP 2491821 A1 EP2491821 A1 EP 2491821A1 EP 10824921 A EP10824921 A EP 10824921A EP 10824921 A EP10824921 A EP 10824921A EP 2491821 A1 EP2491821 A1 EP 2491821A1
Authority
EP
European Patent Office
Prior art keywords
upholstery material
portions
backrest
friction member
frame
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Withdrawn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
EP10824921A
Other languages
German (de)
English (en)
Other versions
EP2491821A4 (fr
Inventor
Ken Nakayama
Kouichirou Wakizono
Ryou Igarashi
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.)
Okamura Corp
Original Assignee
Okamura Corp
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 Okamura Corp filed Critical Okamura Corp
Publication of EP2491821A1 publication Critical patent/EP2491821A1/fr
Publication of EP2491821A4 publication Critical patent/EP2491821A4/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Withdrawn legal-status Critical Current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
    • A47C5/00—Chairs of special materials
    • A47C5/04—Metal chairs, e.g. tubular
    • A47C5/06—Special adaptation of seat upholstery or fabric for attachment to tubular 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
    • A47C1/03283—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with fluid springs
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C31/00—Details or accessories for chairs, beds, or the like, not provided for in other groups of this subclass, e.g. upholstery fasteners, mattress protectors, stretching devices for mattress nets
    • A47C31/02—Upholstery attaching means
    • 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

Definitions

  • the present invention relates to a backrest for a chair, the backrest having a back frame upholstered with a bag-like upholstery material by fitting the bag-like upholstery material onto the back frame.
  • a meshed woven material of synthetic fibers is often used from the viewpoint of ventilation, stretch properties, and tensile strength, for example.
  • an upholstery material is used to upholster a back frame by fitting the upholstery material onto the back frame in a predetermined tensioned state and a sitting person falls back on the backrest, a back-surface portion of the upholstery material positioned to the rear of the back frame is pulled around to the front-surface side of the upholstery material so that a front-surface portion of the upholstery material positioned to the front of the back frame can be appropriately warped backward.
  • the lower portions of the side portions of the upholstery material may move up and slackening or development of wrinkles may be caused.
  • the sliding resistance at the area of contact between the lower portions of the side portions of the upholstery material where the sitting person is supported around the hip and the outer surfaces of the side frames is small, the lower portions of the side portions of the upholstery material are easily moved around toward the front surface side.
  • the front-surface portion of the upholstery material where the sitting person is supported around the hip is excessively warped backward, the lumbar support effect cannot be obtained, and the hip of the sitting person cannot be comfortably supported.
  • the present invention has been made in view of the foregoing problems, and an object of the present invention to provide a backrest for a chair capable of preventing, by making lower portions of side portions of an upholstery material less slidable on side frames, slackening or development of wrinkles due to moving up of the upholstery material, and also preventing a front-surface portion of the upholstery material being excessively warped backward, so that the hip of the sitting person can be comfortably supported.
  • the lower portions of the side portions of the upholstery material is made less slidable, moving up of the upholstery material to cause slackening or development of wrinkles can be prevented. Further, because the lower portions of the side portions of the upholstery material is made less movable around toward the front surface side of the back frame, the front-surface portion of the upholstery material on a lower side thereof where the sitting person is supported around the hip is prevented from being excessively warped backward, so that the hip of the sitting person can be comfortably supported by the lumbar support effect.
  • stitched portions are formed by internally folding and stitching both side-end portions of the upholstery material to cause the upholstery material to be bag-like, each of the stitched portions being covered by a side-end portion of the high-friction member fixed by stitching.
  • the stitched portion of the side-end portions of the upholstery material is covered with the side-end portion of the high-friction member by stitching.
  • the stitched portion of the side-end portions of the upholstery material can be reinforced, so that the upholstery material can be prevented from being frayed.
  • wearing of the side portions of the upholstery material can be reduced, so that the reupholstering intervals of the upholstery material can be extended and cost can be reduced.
  • the high-friction member is formed by one of a polyurethane resin or a foam thereof, a urethane elastomer, and rubber.
  • the present invention provides a backrest for a chair capable of preventing slackening or development of wrinkles due to moving up of the upholstery material, and also preventing a front-surface portion of the upholstery material being excessively warped backward, so that the hip of the sitting person can be comfortably supported.
  • FIGS. 1 and 2 are side views of a chair including a backrest according to an embodiment of the present invention.
  • the chair includes a lower assembly 4 which includes a disk-shaped base 1, a leg column 2 mounted at the center of the disk-shaped base 1 in an upright manner, and a support base 3 fixedly mounted on an upper end of the leg column 2.
  • the support base 3 has a substantially triangular shape expanding from the upper end of the leg column 2 toward the front in plan and side views.
  • a front-lower portion of a seat 5 is pivotally mounted on a base axle 6 extending in a left-right direction.
  • the seat 5 can be rotated about the base axle 6 into a standby position in which the seat 5 is inclined with its rear raised, as illustrated in FIG. 1 , or into a use position in which the seat 5 is horizontal or inclined with its rear slightly lowered, as illustrated in FIG. 2 .
  • the arm rests 7 extend upward from the sides of the rear of the seat 5 and include a backrest pivotal support portion 7a and an arm pad portion 7b.
  • the backrest pivotal support portion 7a includes a curved surface 8 protruding backward and having a semicircular or fan shape in a side view, which shape is centered about a support axle 11 of a backrest 9, which will be described later.
  • the arm pad portion 7b extends forward from an upper portion of the backrest pivotal support portion 7a and has an upwardly arched shape.
  • the arm rests 7 have a generally forwardly extending triangular shape converging in a forward-upper direction in a side view.
  • the arm pad portions 7b may be dimensioned with respect to the front-rear direction such that front-end portions of the arm pad portions 7b are positioned forwardly of a vertical line S passing through the center of the base axle 6, on which the seat 5 is pivoted, in the standby position illustrated in FIG. 1 .
  • the front-end portions of the arm pad portions 7b may be positioned slightly to the rear of the vertical line S corresponding to the base axle 6 on which the seat 5 is pivoted.
  • front-end portions of forwardly extending side pieces 10 extending forward from a lower portion of the backrest 9 on both sides are located.
  • the front-end portions are pivoted on the support axle 11 extending substantially in the left-right direction.
  • the backrest 9 can be rotated about the support axle 11 into an upright position illustrated in FIG. 2 or a backwardly inclined position, not illustrated, with respect to the seat 5 and the arm rests 7.
  • the backrest 9 includes a concave surface 12 facing the rear surface of the backrest pivotal support portions 7a and having an arch shape substantially complementary to the curved surface 8 on the rear surface of the backrest pivotal support portions 7a.
  • the backrest 9 can be rotated about the support axle 11 with the opposed surfaces positioned close to each other.
  • a first biasing portion 13 for biasing the backrest 9 in an upright direction is provided.
  • the first biasing portion 13 may include a gas spring and a compression spring.
  • the support base 3 includes a second biasing portion 14 for helping the sitting person stand up by biasing the seat 5 into the standby position.
  • the second biasing portion 14 includes a rubber torsion unit 15 having an axis in the left-right direction; a backwardly extending first link 16 linked with the rubber torsion unit 15 and biased in the anticlockwise direction in the side view of FIG. 1 ; and a second link 17 having a lower-end portion pivoted to the end of the first link 16 via an axis extending in the left-right direction.
  • An upper end portion of the second link 17 is pivoted on a lower surface of the seat 5 in an intermediate area in the front-rear direction via an axis extending in the left-right direction, the second link 17 extending in a diagonally upward-rear direction.
  • the backrest 9 extends in the up-down direction and includes a back frame 22 having a vertically longer rectangular shape in a front elevation.
  • the back frame 22 includes a pair of right and left side frames 18 extending in the up-down direction and having a gradually increasing front-rear dimension toward the lower ends with which the forwardly extending side pieces 10 are continuously connected.
  • the upper ends of the side frames 18 are coupled via an upper frame 19 extending in the left-right direction.
  • the lower ends of the side frames 18 are coupled via a lower frame 20 extending in the left-right direction.
  • the upper frame 19 and the lower frame 20 are coupled at their intermediate portions in the left-right direction via an intermediate frame 21 which is positioned backwardly of the side frames 18 and extending in the up-down direction.
  • the back frame 22 may be integrally formed from a synthetic resin material having an appropriate elasticity.
  • the synthetic resin material may contain reinforced fibers, such as glass or carbon fibers, for increased strength.
  • the lower portions of the side frames 18 and a lower portion of the intermediate frame 21 are arched with the center of curvature located forwardly in a side view.
  • the upper frame 19 and the lower frame 20 are curved in a plan view, with their intermediate portions positioned backwardly of their side portions.
  • a front-surface portion and a back-surface portion of the upholstery material 26 with respect to the back frame 22 are allowed to be relatively greatly spaced apart from each other in the front-rear direction.
  • the lower portion of the backrest 9 is also backwardly spaced from the rear ends of the seat 5 and the arm rests 7.
  • the intermediate frame 21 may be thinner than the other frame forming members of the back frame 22 so that the intermediate frame 21 can be more readily elastically deformed than the other members. In this way, when the front-surface portion of the upholstery material 26 is subjected to a load as will be described later, the intermediate frame 21 can be elastically deformed in the forward direction.
  • the head-rest frame 25 includes upwardly extending extension frames 23 which are curved with intermediate portions thereof positioned forwardly of the upper and lower portions thereof in a side view. Upper ends of the extension frames 23 are coupled to each other via a top frame 24 extending in the left-right direction.
  • the back frame 22 and the head-rest frame 25 are upholstered from above with the bag-like upholstery material 26 by fitting the bag-like upholstery material 26 onto the back frame 22 and the head-rest frame 25.
  • the upholstery material 26 includes openings in the lower end and lower-side portions, and has stretch properties.
  • the upholstery material 26 may be in the form of a mesh woven from synthetic fibers.
  • the upholstery material 26 includes a head-rest covering portion 27 covering the head-rest frame 25, and a backrest covering portion 28 covering the back frame 22.
  • the back frame 22 and the head-rest frame 25 are covered with the upholstery material 26 in a predetermined tensioned state.
  • the right and left forwardly extending side pieces 10 protrude in the forward direction through the lower-side openings of the upholstery material 26.
  • Lower-end portions of a front-surface portion 28a and a back-surface portion 28b of the upholstery material 26 positioned to the front and rear of the back frame 22, respectively, are joined to each other via a joining means below the lower frame 20 of the back frame 22.
  • the joining means include hook-and-loop fasteners, hooks, and zippers (not illustrated).
  • the head-rest frame 25 and the head-rest covering portion 27 of the upholstery material 26 may be omitted.
  • thin and flexible low-friction members 29 having small sliding resistance with respect to the frames 18 and 23 are disposed on inner surfaces of the side portions of the upholstery material 26 that contact outer surfaces of the side frames 18 of the back frame 22 excepting the forwardly extending side pieces 10, and outer surfaces of the extension frames 23 of the head-rest frame 25.
  • Thin and flexible high-friction members 30 having large sliding resistance with respect to the side frames 18 are disposed on inner surfaces of the side portions of the upholstery material 26 where the sitting person is supported around his or her hip, the inner surfaces contacting the outer surfaces of lower portions of the side frames 18.
  • the low-friction members 29 may include a material such as a polyamide resin (trade name Nylon), fluororesin (Teflon (registered trademark); trade name Daiflon), or polyacetal.
  • the high-friction members 30 may include a material such as a polyurethane resin or a foam thereof, a urethane elastomer, or rubber.
  • the side-end portions of the upholstery material 26 are inwardly folded into layers and stitched into bag-shaped portions at positions close to the inner surfaces on the front side of the right and left side frames 18 or extension frames 23.
  • the front-end portions of the low-friction member 29 and the high-friction member 30 are folded into U-shaped portions by which the folded portions of the upholstery material 26 are covered by stitching.
  • stitched portions 26a of the side-end portions of the upholstery material 26 can be reinforced.
  • the front-end portions of the low-friction member 29 and the high-friction member 30 may be simply stitched onto the stitched portions 26a of the side-end portions of the upholstery material 26 simultaneously without being folded in U-shape.
  • the low-friction member 29 and the high-friction member 30 may be affixed onto the outer surfaces of the side frames 18 and the extension frames 23 or onto the inner surfaces of the side portions of the upholstery material 26 by using an adhesive, rather than by stitching.
  • a concave groove 31 may be formed in the outer surfaces of the side frames 18 and the extension frames 23 in the up-down direction, and a convex portion 32 may be formed on inner surfaces of the low-friction member 29 and the high-friction member 30 in the up-down direction. In this way, by fitting the convex portion 32 in the concave groove 31, the low-friction member 29 and the high-friction member 30 can be detachably mounted on the outer surfaces of the side frames 18 and the extension frames 23.
  • the low-friction member 29 and the high-friction member 30 configured to be elastically deformable may be detachably fitted on the outer surfaces of the side frames 18 and the extension frames 23.
  • the concave groove 31 illustrated in FIG. 8 may not be provided in the side frames 18 and the extension frames 23.
  • the low-friction member 29 and the high-friction member 30 may be a film formed on the outer surfaces of the side frames 18 and the extension frames 23 by coating.
  • the back-surface portion 28b of the upholstery material 26 is pulled and extended as the front-surface portion 28a of the upholstery material 26 is extended and warped backward, as indicated by the two-dot chain line in FIG. 4 .
  • the side portions of the upholstery material 26 are pulled around toward the front-surface portion 28a to some extent, as indicated by arrows, so that the amount of warping of the front-surface portion 28a in the backward direction increases.
  • the upper side portions of the upholstery material 26 are permitted to smoothly move around toward the front surface side, so that the front-surface portion 28a of the upholstery material 26 supporting the back and head of the sitting person can be effectively warped backward in such a manner as to fit the back and head of the sitting person.
  • the back and head of the sitting person can be comfortably supported with flexibility.
  • the development of unpleasant sliding noise can be prevented when the side portions of the upholstery material 26 are moved around toward the front-surface portion 28a.
  • the upholstery material 26 slides with respect to the side frames 18 via the low-friction members 29 affixed on the inner surfaces of the side portions of the upholstery material 26, wearing of the side portions of the upholstery material 26 can be reduced, so that the reupholstering intervals can be extended and cost can be reduced.
  • the high-friction members 30 are attached to the inner surfaces of the side portions of the upholstery material 26 where the sitting person is supported around the hip, the inner surfaces contacting the outer surfaces of the lower portions of the right and left side frames 18.
  • the sliding resistance between the side frames 18 and the lower side portions of the upholstery material 26 is increased.
  • the lower portions of the side frames 18 are curved into an arch shape extending forward, the lower portions of the side portions of the upholstery material 26 are prevented from moving up, thus preventing slackening or development of wrinkles in the lower portion of the upholstery material 26.
  • the lower portion of the front-surface portion 28a of the upholstery material 26 where the sitting person is supported around the hip can be maintained in a properly tensioned state and prevented from being excessively warped backward.
  • the lumbar support effect can be obtained and the hip of the sitting person can be comfortably supported, thereby providing enhanced comfort to the sitting person.
  • the side portions of the upholstery material 26 can slide with respect to the low-friction member 29 and the high-friction member 30 attached to the side frames 18.
  • the present invention is not limited to the foregoing embodiments and may include various other modifications or implementations.
  • the low-friction members 29 are attached to the inner surfaces of the upper side portions, excluding the lower side portions of the upholstery material 26, the low-friction members 29 may be omitted and only the high-friction members 30 may be provided.
  • the high-friction members 30 may be disposed on the inner surfaces of the side portions of the upholstery material 26 or on the outer surfaces of the side frames 18.
  • the high-friction members 30 may be disposed on both the outer surfaces of the side frames 18 and the inner surfaces of the side portions of the upholstery material 26, so that the high-friction members 29 can be contacted with each other.
  • the present invention may be applied to the backrest for conventional chairs having the seat 5 that is not inclined up or down.

Landscapes

  • Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Chair Legs, Seat Parts, And Backrests (AREA)
EP10824921.0A 2009-10-19 2010-10-19 Dossier pour chaise Withdrawn EP2491821A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2009240146A JP5606717B2 (ja) 2009-10-19 2009-10-19 椅子の背凭れ
PCT/JP2010/068341 WO2011049072A1 (fr) 2009-10-19 2010-10-19 Dossier pour chaise

Publications (2)

Publication Number Publication Date
EP2491821A1 true EP2491821A1 (fr) 2012-08-29
EP2491821A4 EP2491821A4 (fr) 2014-10-29

Family

ID=43900297

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10824921.0A Withdrawn EP2491821A4 (fr) 2009-10-19 2010-10-19 Dossier pour chaise

Country Status (7)

Country Link
US (1) US20120212027A1 (fr)
EP (1) EP2491821A4 (fr)
JP (1) JP5606717B2 (fr)
KR (1) KR20120098633A (fr)
CN (1) CN102573571A (fr)
CA (1) CA2778163A1 (fr)
WO (1) WO2011049072A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD689313S1 (en) 2012-09-20 2013-09-10 Steelcase Inc. Chair
USD690146S1 (en) 2012-09-20 2013-09-24 Steelcase Inc. Chair
USD758774S1 (en) 2015-04-24 2016-06-14 Steelcase Inc. Headrest assembly
USD759415S1 (en) 2015-04-24 2016-06-21 Steelcase Inc. Headrest
USD760526S1 (en) 2015-04-24 2016-07-05 Steelcase Inc. Headrest assembly
USD781605S1 (en) 2015-04-24 2017-03-21 Steelcase Inc. Chair
USD781604S1 (en) 2015-04-24 2017-03-21 Steelcase Inc. Chair

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5855879B2 (ja) * 2011-09-12 2016-02-09 株式会社岡村製作所 椅子
JP6414964B2 (ja) * 2014-10-24 2018-10-31 株式会社オカムラ 椅子用荷重支持部材および椅子
JP6529154B2 (ja) * 2014-10-24 2019-06-12 株式会社オカムラ 椅子用荷重支持部材および椅子
WO2017213229A1 (fr) * 2016-06-10 2017-12-14 株式会社岡村製作所 Structure de support de charge pour chaise, corps de support de charge pour chaise, et chaise
US11690457B2 (en) * 2020-02-04 2023-07-04 Hni Technologies Inc. Chair with flexible internal support

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US20020017814A1 (en) * 1999-11-05 2002-02-14 Alfred G. Niederman Modular furniture including interchangeable upholstery
JP2002172039A (ja) * 2000-12-06 2002-06-18 Kokuyo Co Ltd 家 具
DE20216302U1 (de) * 2002-10-22 2003-04-17 Vitra Patente Ag Muttenz Neigbare Rückenlehne mit elastischer Bespannung
JP2009112396A (ja) * 2007-11-02 2009-05-28 Okamura Corp 椅子の背凭れ装置

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US4062589A (en) * 1976-08-04 1977-12-13 Klein Gerhart P Chair with contoured seat
US20020017814A1 (en) * 1999-11-05 2002-02-14 Alfred G. Niederman Modular furniture including interchangeable upholstery
JP2002172039A (ja) * 2000-12-06 2002-06-18 Kokuyo Co Ltd 家 具
DE20216302U1 (de) * 2002-10-22 2003-04-17 Vitra Patente Ag Muttenz Neigbare Rückenlehne mit elastischer Bespannung
JP2009112396A (ja) * 2007-11-02 2009-05-28 Okamura Corp 椅子の背凭れ装置

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Title
See also references of WO2011049072A1 *

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD689313S1 (en) 2012-09-20 2013-09-10 Steelcase Inc. Chair
USD689319S1 (en) 2012-09-20 2013-09-10 Steelcase Inc. Chair
USD690146S1 (en) 2012-09-20 2013-09-24 Steelcase Inc. Chair
USD690547S1 (en) 2012-09-20 2013-10-01 Steelcase Inc. Chair
USD699958S1 (en) 2012-09-20 2014-02-25 Steelcase Inc. Chair
USD699959S1 (en) 2012-09-20 2014-02-25 Steelcase Inc. Chair
USD758774S1 (en) 2015-04-24 2016-06-14 Steelcase Inc. Headrest assembly
USD759415S1 (en) 2015-04-24 2016-06-21 Steelcase Inc. Headrest
USD760526S1 (en) 2015-04-24 2016-07-05 Steelcase Inc. Headrest assembly
USD781605S1 (en) 2015-04-24 2017-03-21 Steelcase Inc. Chair
USD781604S1 (en) 2015-04-24 2017-03-21 Steelcase Inc. Chair

Also Published As

Publication number Publication date
CA2778163A1 (fr) 2011-04-28
JP5606717B2 (ja) 2014-10-15
US20120212027A1 (en) 2012-08-23
CN102573571A (zh) 2012-07-11
JP2011083518A (ja) 2011-04-28
EP2491821A4 (fr) 2014-10-29
WO2011049072A1 (fr) 2011-04-28
KR20120098633A (ko) 2012-09-05

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