EP2359717A1 - Rückenkehne für einen stuhl - Google Patents

Rückenkehne für einen stuhl Download PDF

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Publication number
EP2359717A1
EP2359717A1 EP09823317A EP09823317A EP2359717A1 EP 2359717 A1 EP2359717 A1 EP 2359717A1 EP 09823317 A EP09823317 A EP 09823317A EP 09823317 A EP09823317 A EP 09823317A EP 2359717 A1 EP2359717 A1 EP 2359717A1
Authority
EP
European Patent Office
Prior art keywords
frame
frames
backrest
upholstering material
upholstering
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.)
Granted
Application number
EP09823317A
Other languages
English (en)
French (fr)
Other versions
EP2359717B1 (de
EP2359717A4 (de
Inventor
Ryo Igarashi
Ken Nakayama
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
Priority claimed from JP2008277530A external-priority patent/JP5512951B2/ja
Priority claimed from JP2009054129A external-priority patent/JP5616585B2/ja
Application filed by Okamura Corp filed Critical Okamura Corp
Publication of EP2359717A1 publication Critical patent/EP2359717A1/de
Publication of EP2359717A4 publication Critical patent/EP2359717A4/de
Application granted granted Critical
Publication of EP2359717B1 publication Critical patent/EP2359717B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • A47C7/446—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame with fluid springs
    • 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
    • A47C7/46—Support for the head or the back for the back with special, e.g. adjustable, lumbar region support profile; "Ackerblom" profile chairs

Definitions

  • the present invention relates to a chair backrest.
  • This application claims priorities based on Japanese Patent Application Nos. 2008-277530 filed in Japan on October 29, 2008, and 2009-54129 filed in Japan on March 6, 2009, the contents of which are incorporated herein by reference.
  • an object of the present invention is to provide a chair backrest in which, when a person sitting on the chair leans against the backrest, a reaction force of the upholstering material does not vary to an extreme extent during the leaning action and a rearward recess amount of the upholstering material of the backrest in response to a load is sufficiently secured, thereby obtaining a comfortable sitting sensation.
  • the rear surface portion is also elongated, whereby the elongation of the rear surface portion causes an increase in the rearward recess ratio of the front surface portion, thus making it possible to obtain a comfortable sitting sensation.
  • the intermediate frames can be greatly separated rearward from the both side portion frames.
  • the effect of the above (1) can be further enhanced, and the thickness of the backrest in the front and rear direction can be thickly formed, which can give the backrest a high quality sensation.
  • the elasticity of the intermediate frame complements the tension of the upholstering material, whereby it is possible to further increase the rearward recess ratio of the front surface portion of the upholstering material according to this synergistic action.
  • the reaction force of the upholstering material does not vary to an extreme extent during the leaning action, and a rearward recess amount of the upholstering material of the backrest in response to a load can be sufficiently secured, thereby obtaining a comfortable sitting sensation.
  • FIGS. 1 to 3 show a chair that includes a first embodiment of a backrest of the present invention.
  • the chair includes a lower portion constituent body 4 in which a leg column 2 is vertically provided in the center of a base 1 of a disk and a support base 3 is attached to an upper end of the leg column 2.
  • the leg column 2 may be configured such that the height thereof can be controlled by a gas spring (not shown).
  • the support base 3 has a shape that is expanded from the upper end of the leg column 2 toward the front in a nearly triangular shape in a planar view and the side surface.
  • a front lower portion of a seat 5 is supported via a base shaft 6 extending in the left and right direction, and the seat 5 can be rotated around the base shaft 6 between a stand-by position inclining rearward and upward as shown in FIG. 1 and a horizontal or a slightly rearward and downwardly inclined use position as shown in FIGS. 2 and 3 .
  • a pair of left and right armrests 7 and 7 is integrally formed.
  • the respective armrests 7 and 7 are vertically provided in the rear portion of both sides of the seat 5.
  • the rear portions of the respective armrests 7 and 7 include a backrest pivot support portion 7a having a curved surface 8 which is protruded rearward centered on a support shaft 11 of the backrest 9 described later and has a semicircular arc shape or a fan shape when viewed from the side surface, and an arm support portion 7b that is extended forward from the upper portion of the backrest pivot support portion 7a and has an upward arc shape, and the entire shape forms an approximately forward triangular shape when viewed from the side surface that converges toward the front upper part.
  • the size of the arm support portion 7b in the front and rear direction is set such that the front end portion thereof is in the stand-by position shown in FIG. 1 and is located further forward from a vertical line V passing through the center of the base shaft 6 that is an attachment shaft of the seat 5. Furthermore, as shown in FIG. 2 , the size is set such that, when the seat 5 is in the use position, the front end portion of the arm support portion 7b is situated behind the vertical line V, that is, slightly behind the base shaft 6.
  • a front inventory of a front side piece 10 extending forward from both lower portions of the backrest 9 is supported via the support shaft 11 extended approximately in the left and right direction.
  • the backrest 9 can be rotated centering on the support shaft 11 between a standing position shown in FIG. 2 and a rearward slope position shown in FIG. 3 with respect to the seat 5 and the armrest 7.
  • the outer surface of the backrest pivot support portion 7a is protruded outward such that the attachment part of the front side piece 10 is situated in the outermost side such that the inner surface of the front side piece 10 does not widely come into contact with the outer surface of the backrest pivot support portion 7a.
  • first biasing means 13 formed of a gas spring which biases the backrest 9 in the standing direction, a compression spring or the like.
  • the second biasing means 14 that can assist the standing of a person sitting on the chair by biasing the seat 5 toward the stand-by position.
  • the second biasing means 14 includes a rubber torsion unit 15 that has an axis for example which extends in the left and right direction; a rearward-facing first link 16 that is connected to the rubber torsion unit 15 and is biased in a counterclockwise direction when viewed from the side surface in FIG.
  • the armrest 7 is formed integrally with the seat 5, even when the seat 5 is rotated between the stand-by position and the use position or the backrest 9 slopes, the relative position of the armrest 7 relative to the seat 5 is not changed. For that reason, the elbows of a person can be placed on the armrest 7 in a natural state between the stand-by position and the use position, whereby the usability of the chair is improved.
  • the front end portion of the arm support portion 7b in the armrest 7 is situated in front of a vertical line V passing through the center of the base shaft 6 with the seat 5 attached thereto.
  • the front end portion of the front side piece 10 extending forward from both side lower portions of the backrest 9 is attached to the backrest pivot support portion 7a standing up from the rear both side portions of the seat 5 via the support shaft 11, and the opposed surfaces of the backrest pivot support portion 7a and the lower portion of the backrest 9 are a circular arc-shaped or fan-shaped round surface 8 and a circular arc-shaped concave curved surface 12 around the support shaft 11.
  • the backrest 9 it is possible to cause the backrest 9 to greatly slope rearward without interfering with the seat 5 and the armrest 7.
  • the backrest 9 since the lower portion of the backrest 9 is firmly supported on the backrest pivot support portion 7a of the armrest 7 formed integrally with the seat 5, the backrest 9 having a large up and down size can also be supported such that it can be stably and smoothly rotated.
  • the backrest 9 includes a back frame 22 having a front shape of a longitudinal rectangular frame shape that is formed by connecting the upper ends of a pair of left and right side portion frames 18 and 18 extending in the up and down direction by a lower frame 20 extending in the left and right direction, connecting the lower ends of both side portion frames 18 and 18 by the upper frame 19 extending in the left and right direction, and connecting the intermediate portions of an upper frame 19 and the lower frame 20 in the left and right direction by an intermediate frame 21 that is situated behind the both side portion frames 18 and 18 and is extended in the up and down direction.
  • the back frame 22 is integrally formed by a synthetic resin material having a suitable elasticity. It is desirable that a reinforced fiber such as a glass fiber or a carbon fiber is added to the synthetic resin material.
  • both side portion frames 18 and 18 and the lower portion of the intermediate frame 21 have circular arc-shaped curved shapes with a curvature center thereof situated in the front when viewed from the side surface, and the upper frame 19 and the lower frame 20 have curved shapes with an intermediate portion thereof situated behind the both side portions when viewed in a plan view.
  • the lower portion of the backrest 9 is separated rearward from the rear end portions of the seat 5 and the armrest 7, and the backrest 9 is prevented from interfering with the rear ends of the seat 5 and the armrest 7 upon being rotated, whereby the rearward rotation range of the backrest 9 can be enlarged.
  • the intermediate frame 21 is easier to deform elastically than other portions as it is formed to be thinner than other frame constitution members in the back frame 22. For that reason, when a load is applied to the front surface portion of an upholstering material 26 described later, the intermediate frame 21 can be elastically deformed rearward.
  • the rearward displacement amount of the intermediate frame 21 relative to both side portion frames 18 and 18 is set to increase as it moves closer to the lower part.
  • left and right front side pieces 10 are formed integrally with the lower portions of both side portion frames 18 and 18.
  • both side portion frames 18 and 18 In the upper end of both side portion frames 18 and 18, upward-facing extension frames 23 and 23, which are curved such that intermediate portions thereof are situated ahead of the upper and lower portions when viewed from the side surface, are consecutively provided. Furthermore, a headrest frame 25 is integrally formed in the upper end of the back frame 22, the headrest frame 25 being formed by connecting the upper ends of both extension frames 23 and 23 to each other by a top portion frame 24 extended in the left and right direction.
  • the bag-like upholstering material 26 having elasticity with a lower end open and both lower portions open is provided in a state of tension by covering the frames from the upper part.
  • the upholstering material 26 includes a headrest cover portion 27 that covers a headrest frame 25, and a backrest cover portion 28 that covers the back frame 22, and the fabrics thereof are different from each other. Furthermore, the fabrics of the front surface portion 27a and the rear surface portion 27b in the headrest cover portion 27 and the fabrics of the front surface portion 28a and the rear surface portion 28b in the backrest cover portion 28 are also different from each other.
  • Both of the fabrics of the headrest cover portion 27 and the backrest cover portion 28 are mesh materials, but the fabric of at least the front surface portion 27a of the headrest cover portion 27 is formed by a mesh material having elasticity superior to that of the fabric of at least the front surface portion 28a of the backrest cover portion 28.
  • the fabric of at least the front surface portion 27a of the headrest cover portion 27 is a mesh material having coarse eyes of a low density
  • the fabric of at least the front surface portion 28a of the backrest cover portion 28 is a fine-mesh material which has a high mesh density
  • the direction of the texture or the stitches of the mesh material is extended in the left and right direction in the front surface portion 27a in the headrest cover portion 27 and the front surface portion 28a in the backrest cover portion 28, and is extended in the up and down direction in the rear surface portion 27b in the headrest cover portion 27 and the rear surface portion 28b in the backrest cover portion 28. That is, such a mesh material is elongated in a transverse direction in the front surface portions 27a and 28a and is elongated in a longitudinal direction in the rear surface portions 27b and 28b.
  • the front surface portion 28a in the backrest cover portion 28 is a mesh material having fine eyes of a high density and the surface thereof is a fabric of a mesh material which is flexible and has a low light transmitting property or transparency.
  • the rear surface portion 28b in the backrest cover portion 28 is a mesh material having coarse eyes of a low density and is a fabric of a mesh material having a high light transmitting property or transparency.
  • the fabric of the front surface portion 28a it is desirable to use a maul-shaped fiber that is formed by twisting a short fiber interposed between a plurality of elastic threads.
  • front surface portion 27a and the rear surface portion 27b in the headrest cover portion 27 and the front surface portion 28a and the rear surface portion 28b in the backrest cover portion 28 are different from each other in color as well as material, thereby the high-quality design can be provided.
  • the upholstering material 26 may be formed by covering and providing one formed in a bag shape over the back frame 22 or the like in a state of tension.
  • the upholstering material 26 may be formed in a bag shape.
  • the lower end portion of the upholstering material 26 is attached to the lower end portion of the lower frame 20 by causing the left and right front side pieces 10 and 10 to protrude from the openings of both side lower portions toward the front and joining the lower end portions of the front surface portion 28a and the rear surface portion 28b to each other by a surface fastener, a hook, a fastener, and other joining means (none of which are shown) in the lower part of the lower frame 20 in the back frame 22.
  • the headrest cover portion 27 that covers a headrest frame 25 of the upholstering material 26 may be omitted.
  • the intermediate portions of the upper frame 19 and the lower frame 20 are connected by the intermediate frame 21 that is situated behind the both side portion frames 18 and 18 and is extended in the up and down direction, and the intermediate portion of the rear surface portion 26b of the upholstering material 26 protrudes rearward from the intermediate frame 21.
  • the front surface portion 28a of the upholstering material 26 does not come into contact with the rear surface portion 28b, and the resistance force of the upholstering material 26 does not vary to an extreme extent during the leaning action.
  • the rear surface portion 28b is also elongated along with the elongation of the front surface portion 28a of the upholstering material 26 and the rearward recess amount of the front surface portion 28a is increased by the elongation of the rear surface portion 28b, a comfortable sitting sensation can be obtained.
  • the intermediate frame 21 can be greatly separated rearward from both side portion frames 18 and 18. For that reason, the aforementioned effect can be further enhanced, and it is possible to give the backrest 9 a high quality sensation by increasing the thickness of the backrest 9 in the front and rear direction.
  • the headrest having a characteristic shape integrally with the back frame 22 by the headrest frame 25 and by the headrest cover portion 27 covering the headrest frame 25 in the bag-like upholstering material 26.
  • the fabrics of the front surface portions 27a and 28a and the rear surface portions 27b and 28b are different from each other as mentioned above.
  • the occurrence of a moiré pattern can be prevented.
  • the rearward displacement amount of the intermediated frame 21 relative to both side portion frames 18 and 18 increases as it moves closer to the lower part.
  • the bag-like upholstering material 26 having the same material, size or the like in any portion of the up and down direction, it is possible to make the initial tension of the upholstering material 22 in the lower portion of the backrest 9 greater than the initial tension of the upholstering material 26 in the upper portion of the backrest 9.
  • FIG. 5 is a side view of a chair including a backrest device of a second embodiment in the present invention
  • FIG. 6 is a partially enlarged front view that partially cuts away upholstering material of a front surface in a chair backrest and shows the upholstering material of a front surface and the upholstering material of a rear surface
  • FIG. 7 is a major part enlarged longitudinal cross-sectional view of a backrest taken along lines VII-VII of FIG. 6 .
  • the members having the same configuration as those of the first embodiment will be denoted by the same reference numerals as in the first embodiment, and descriptions thereof will be omitted.
  • the chair of the present embodiment can be rotated around the base shaft 6 between an A position of a stand-by state inclining rearward and upward as shown in FIG. 5 , a B position of a nearly horizontal normal use state and a C position of a reclining-use state slightly inclining rearward and downwardly as shown in FIG. 5 by two-dot chain lines.
  • a porous sheet-like upholstering material for example, the upholstering material 26 of a mesh shape having flexibility composed of cloth or the like in a bag shape with a lower end open and both side lower portions open is provided in a state of tension.
  • a mesh 127 in a front surface 26A side of the upholstering material 26 relative to the backrest frame 22 has the same shape as that of a mesh 128 in a rear surface 26B thereof. Furthermore, the sizes of the meshes 127 and 128 are different from each other such that the size of the front surface 26A side is fine and that of the rear surface 26B side is coarse. As a result, when viewing the chair backrest 9 from the front, a clear pattern formed of a plurality of assembly shapes similar to the shapes of the meshes 127 and 128 can clearly emerge on the whole surface of the backrest 9.
  • the size of the mesh 127 of the front surface 26A in the upholstering material 26 is within the range of 95% to 80% of the mesh 128 of the rear surface 26B. That is, as in a case where the size of the mesh 127 of the front surface 26A in the upholstering material 26 is equal to or greater than 95% of the mesh 128 of the rear surface 26B, when there is no great difference in the sizes of the meshes 127 and 128, the moiré pattern is simple as in the related art and does not change sufficiently, and there is no depth in terms of design.
  • the size of the mesh 27 of the front surface 26A is equal to or less than 80% of that of the mesh 128 of the rear surface 26B, for example, 50%, there is no interest due to the combination, and in the size equal to or less than 25%, only a shape with insufficient change is obtained in which the shape of the mesh 127 of the front surface 26A and the shape of the mesh 128 of the rear surface 26B overlap with each other.
  • FIGS. 8A to 8C show a pattern of a moiré pattern due to a change (%) in the sizes of the mesh of the upholstering material of the front surface relative to the upholstering material of the rear surface.
  • FIG. 8A is a diagram that shows a shape of a case where the size of the mesh of the upholstering material of the front surface is 95% of that of the upholstering material of the rear surface.
  • FIG. 8B is a diagram that shows a shape of a case where the size of the mesh of the upholstering material of the front surface is 90% of that of the upholstering material of the rear surface.
  • FIG. 8C is a diagram that shows a shape of a case where the size of the mesh of the upholstering material of the front surface is 80% of that of the upholstering material of the rear surface.
  • FIGS. 9A to 9C show another embodiment of a pattern of a moiré pattern due to a change (%) in the sizes of the mesh of the upholstering material of the front surface relative to the upholstering material of the rear surface.
  • FIG. 9A is a diagram that shows a shape of a case where the size of the mesh of the upholstering material of the front surface is 95% of that of the upholstering material of the rear surface.
  • FIG. 9B is a diagram that shows a shape of a case where the size of the mesh of the upholstering material of the front surface is 90% of that of the upholstering material of the rear surface.
  • FIG. 9C is a diagram that shows a shape of a case where the size of the mesh of the upholstering material of the front surface is 80% of that of the upholstering material of the rear surface.
  • the upholstering material forming a mesh shape formed of a cloth or the like was used, it is also possible to use a punching metal having a plurality of opened hole portions, a wire composed in a mesh shape or the like as the upholstering material.
  • the present invention can be carried out in a plurality of modified forms without being limited to only the above embodiments.
  • the reaction force of the upholstering material does not vary to an extreme extent during the leaning action, and a rearward recess amount of the upholstering material of the backrest in response to a load can be sufficiently secured, thereby obtaining a comfortable sitting sensation.
  • first biasing means 14 second biasing means, 15 rubber torsion unit, 16 first link, 17 second link, 18side portion frame, 19 upper frame, 20 lower frame, 21 intermediate frame, 22 back frame, 23 extension frame, 24 top frame, 25 headrest frame, 26 upholstering material, 26A front surface, 26B rear surface, 27 headrest cover portion, 27a front surface portion, 27b rear surface portion, 28 backrest cover portion, 28a front surface portion, 28b rear surface portion, 127, 128 mesh, V vertical line

Landscapes

  • Chair Legs, Seat Parts, And Backrests (AREA)
EP09823317.4A 2008-10-29 2009-10-28 Rückenlehne für einen stuhl Not-in-force EP2359717B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2008277530A JP5512951B2 (ja) 2008-10-29 2008-10-29 椅子の背凭れ
JP2009054129A JP5616585B2 (ja) 2009-03-06 2009-03-06 椅子の背凭れ装置
PCT/JP2009/005705 WO2010050204A1 (ja) 2008-10-29 2009-10-28 椅子の背凭れ

Publications (3)

Publication Number Publication Date
EP2359717A1 true EP2359717A1 (de) 2011-08-24
EP2359717A4 EP2359717A4 (de) 2013-10-16
EP2359717B1 EP2359717B1 (de) 2014-11-26

Family

ID=42128575

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09823317.4A Not-in-force EP2359717B1 (de) 2008-10-29 2009-10-28 Rückenlehne für einen stuhl

Country Status (6)

Country Link
US (1) US20110204694A1 (de)
EP (1) EP2359717B1 (de)
KR (1) KR20110090904A (de)
CN (1) CN102202546A (de)
CA (1) CA2742008A1 (de)
WO (1) WO2010050204A1 (de)

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USD705561S1 (en) 2013-05-16 2014-05-27 Steelcase Inc. Chair
USD708466S1 (en) 2013-05-16 2014-07-08 Steelcase Inc. Chair

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CN103391733A (zh) * 2011-01-27 2013-11-13 株式会社冈村制作所 椅子的靠背装置
US11304528B2 (en) 2012-09-20 2022-04-19 Steelcase Inc. Chair assembly with upholstery covering
US8998339B2 (en) 2012-09-20 2015-04-07 Steelcase Inc. Chair assembly with upholstery covering
US11229294B2 (en) 2012-09-20 2022-01-25 Steelcase Inc. Chair assembly with upholstery covering
JP6204011B2 (ja) * 2012-10-16 2017-09-27 株式会社岡村製作所 フレームへの張材の張設構造、およびそれを用いた椅子の背凭れ
JP6123239B2 (ja) * 2012-11-06 2017-05-10 コクヨ株式会社 椅子の表皮材
JP6552083B2 (ja) * 2014-10-24 2019-07-31 株式会社オカムラ 椅子用荷重支持部材および椅子
EP3210498B1 (de) 2014-10-24 2019-06-12 Okamura Corporation Möbelstück, lastträgerelement für einen stuhl und stuhl
WO2016063973A1 (ja) * 2014-10-24 2016-04-28 株式会社岡村製作所 家具、椅子用荷重支持部材及び椅子
WO2019112956A1 (en) * 2017-12-05 2019-06-13 Steelcase Inc. Compliant backrest
EP4268676A3 (de) 2019-02-21 2024-02-07 Steelcase Inc. Körperstützanordnung und verfahren zur verwendung und montage davon
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USD704945S1 (en) 2013-05-16 2014-05-20 Steelcase Inc. Chair
USD705561S1 (en) 2013-05-16 2014-05-27 Steelcase Inc. Chair
USD708466S1 (en) 2013-05-16 2014-07-08 Steelcase Inc. Chair

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US20110204694A1 (en) 2011-08-25
KR20110090904A (ko) 2011-08-10
CA2742008A1 (en) 2010-05-06
EP2359717B1 (de) 2014-11-26
WO2010050204A1 (ja) 2010-05-06
EP2359717A4 (de) 2013-10-16

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