EP2668871B1 - Dispositif de dossier de chaise - Google Patents

Dispositif de dossier de chaise Download PDF

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Publication number
EP2668871B1
EP2668871B1 EP11857303.9A EP11857303A EP2668871B1 EP 2668871 B1 EP2668871 B1 EP 2668871B1 EP 11857303 A EP11857303 A EP 11857303A EP 2668871 B1 EP2668871 B1 EP 2668871B1
Authority
EP
European Patent Office
Prior art keywords
backrest
elastic membrane
frame member
frame
viewed
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.)
Not-in-force
Application number
EP11857303.9A
Other languages
German (de)
English (en)
Other versions
EP2668871A1 (fr
EP2668871A4 (fr
Inventor
Atsunori MATSUMOTO
Hiroshi Saotome
Yoshinori ISOGAI
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 EP2668871A1 publication Critical patent/EP2668871A1/fr
Publication of EP2668871A4 publication Critical patent/EP2668871A4/fr
Application granted granted Critical
Publication of EP2668871B1 publication Critical patent/EP2668871B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47CCHAIRS; SOFAS; BEDS
    • A47C7/00Parts, details, or accessories of chairs or stools
    • A47C7/36Support for the head or the back
    • A47C7/40Support for the head or the back for the back
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47CCHAIRS; SOFAS; BEDS
    • A47C7/00Parts, details, or accessories of chairs or stools
    • A47C7/36Support for the head or the back
    • A47C7/40Support for the head or the back for the back
    • A47C7/46Support 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 the backrest of a chair in which an elastic membrane is stretched over a substantially rectangular backrest frame to form a back-contacting surface.
  • the backrest of a chair comprises a substantially rectangular backrest frame and an elastic membrane knitted or woven as high-tension elastic mesh that is stretched over the backrest frame.
  • the backrest in which suitable elasticity is applied to the back-contacting surface is known in Patent Literatures 1 and 2.
  • An elastic membrane is molded by suitable tension together with a backrest frame with a die, which is known in Patent Literature 3.
  • the middle of the back-contacting surface projects backward when viewed from the above, and right and left side frames are bent to project forward in the middle so that the back of the user may be fitted.
  • upper and lower frame members of the backrest frame are rounded backward, and right and left side frame members are bent to project forward in the middle when viewed from the side.
  • Upper and lower edges of the elastic membrane are stretched over the backrest frame, and right and left side edges are stretched to the right and left side frame members for the backrest frame.
  • the side frame member of the backrest frame is bent at the bent point to project in the middle forward when viewed from the side and the elastic membrane is stretched over the backrest frame to curve forward at the curved point in the middle.
  • the shape-maintaining member is provided between the bent point of each of the right and left side frame members and part of the lower frame member near the side frame member.
  • the lower part of the elastic membrane is supported by shape-maintaining member.
  • the shape-maintaining member creates restraining force for restraining a returning force for elastically returning the elastic membrane to a flat face.
  • the shape-maintaining member is provided obliquely outward and upward between the bent point of the side frame member and part of the lower frame member near the side frame member.
  • the curved point of the elastic membrane is higher than the bent point of the side frame member close to the back bone of the user.
  • the curved point of the elastic membrane presses the lumbar of the user, he/she can keep stable sitting posture with a straight back.
  • the backrest frame is molded together with the shape-maintaining member and elastic membrane, thereby increasing support strength of the elastic membrane by the backrest frame and shape-maintaining member and restraining elastic-returning force of the elastic membrane.
  • the upper frame member is formed like an arc projecting backward when viewed from the above.
  • the back surface of the elastic membrane is supported by the shape-maintaining member to press forward.
  • a restraining force is applied against the direction of elastic returning force.
  • the elastic membrane which acts as back-contacting surface can stably be maintained like an arc which curves backward when viewed from the above.
  • the upper frame member is straight when viewed from the above.
  • a restraining force for pushing the elastic membrane forward is applied by the shape-maintaining member against a returning force which pushes backward to have the back-contacting surface of the elastic membrane come closer to a flat surface.
  • the lower frame member is formed like an arc which projects backward.
  • the lower edge of the elastic membrane can be maintained like an arc.
  • the shape of the elastic membrane forming a back-contacting surface can be maintained for a long time.
  • FIG. 1 is a perspective view of one embodiment of a chair comprising the backrest according to the present invention
  • FIG. 2 is a back elevational view of the chair
  • FIG. 3 is a central vertical sectional view taken along the line III-III in FIG. 2 to illustrate that a user sits on the chair
  • FIG. 4 is an exploded perspective view of the chair.
  • a leg unit 2 comprises a pair of side legs 3,3 to which metal pipe is bent like a rectangle, and a pair of cross rails 4,5 for connecting the upper ends of the side legs 3,3 to each other.
  • a seat 6 is attached over the leg unit 2 and a backrest 7 is attached to the back end of the seat 6.
  • a synthetic-resin seat frame 8 such as polypropylene comprises front and back frame members 8A,8B and right and left frame members 8C,8C like a rectangle.
  • the circumferential edge of an elastic membrane 9 into which polyamide or polypropylene fiber is knitted or woven like a mesh is stretched by one-piece molding.
  • FIG. 5 is an enlarged vertical sectional view of the seat taken along the line V-V in FIG. 4 ;
  • FIG. 6 is an enlarged vertical sectional view of the seat taken along the line VI-VI in FIG. 4 ;
  • FIG. 7 is an enlarged vertical sectional view of the seat taken along the line VII-VII in FIG. 4 ;
  • FIG. 8 is an enlarged vertical sectional view of the seat taken along the line VIII-VIII in FIG. 4 .
  • a front edge 9a is supported by the inner circumferential surface of the front frame member 8A of the seat frame 8; a back edge 9b is supported by the inner circumferential surface of the back frame member 8B of the seat frame 8; and right and left side edges 9c,9c are supported by the inner circumferential surfaces of the side frame members 8C,8C of the seat frame 8.
  • an arcuate front tongue 10 is formed to extend backward and upward, and the front part of the elastic membrane 9 is held on the upper surface of the front tongue 10.
  • the front tongue 10 has two arcs projecting downward between the center of the width and the side frame members 8c,8c.
  • the rear end 10a of the front tongue 10 is curved downward not to come in contact with the lower surface of the elastic membrane 9.
  • the buttock of the user goes down in a recess 12 and the right and left thighs bends down with the elastic membrane 9 to come in contact with the right and left recesses of the front tongue 10, so that the front tongue 10 plays a role in cushioning against the weight of the user.
  • the back frame member 8B is an arc which slightly projects backward when viewed from the above and an arc which slightly projects downward when viewed from the back.
  • the back frame member 9B has a rear tongue 11 in a trapezoid in which a front side is shorter than a back side when viewed from the above.
  • the rear tongue 11 has a front end 11a which is an arc which slightly projects backward when viewed from the above and curves forward and downward to be lower than the upper surface of the back frame member 8B.
  • the middle of the back edge 9b of the elastic membrane 9 is supported by the front end of the rear tongue 11 so that the middle of the elastic membrane 9 gently projects downward in FIG. 8 .
  • the elastic membrane 9 is stretched so as to form a gentle curve from the highest point P in the middle of the front tongue 10 formed as an arc backward and upward from the front frame member 8A, to the lowest point Q at which the elastic membrane 9 is supported by the front end 11 a of the rear tongue 11 curved downward, thereby forming the recess 12 which gradually lowers from the back end 10a of the front tongue 10 in the middle of the seating surface of the seat 6 to the front end 11a of the rear tongue 11 of the back frame member 8B.
  • the recess 12 ensures that the user's buttock and thighs are held with the front sectional shape of the front tongue 10 to not deviate laterally.
  • the side frame member 8C is formed from the highest point R of the front part which curves backward and upward, to the middle part which curves backward and downward and the lowest point of the back part, and curves backward and upward.
  • the lowest point Q at the back end of the elastic membrane 9 supported by the front end 11a of the rear tongue 11 is rearward of and lower than the lowest point S of the back part of the side frame member 8C supporting the side edges of the elastic membrane 9.
  • the highest point R of the side frame member 8C is higher than the middle of the front tongue 10, and the front part of the seat 6 becomes lower toward the middle.
  • the lowest point Q at the back end of the elastic membrane 9 supported by the front end 11a of the rear tongue 11 is positioned at the back of the lowest point S of the back part of the side frame member 8C.
  • the seat 6 lowers without spreading backward from the highest point R to the lowest point S of the side frame member 8, and the seat 6 gradually shrinks and lowers toward the front end 11 a of the rear tongue 11 at the lowest point Q at the back end of the elastic membrane 9 from the lowest point S of the side frame member 8c, so that the buttocks of the user can be held more suitably and he/she can take more stable sitting posture.
  • the front part is tilted backward and upward, and the middle part is tilted backward and downward from the highest point R.
  • the side frame member 8C is gently tilted backward and upward from the lowest point A of the rear part, thereby improving the appearance of the seat.
  • the lowest point Q is lower than the lowest point S of the side frame member 8C by which the elastic membrane 9 is supported.
  • the side edges of the elastic membrane is positioned at the back of the lowest point S of the side frame member 8C.
  • the recess 12 curves gradually backward from the back part of the side frame member 8C when viewed from the above to enable it to fit the top and side shapes of the back frame member 8C.
  • a synthetic resin backrest frame 13 such as polypropylene comprises an upper frame member 13A and a lower frame member 13B, and right and left frame members 13C,13C like a rectangle.
  • the circumferential edges of an elastic membrane 14 to which polyamide fibers or polypropylene fibers are knitted or woven as mesh are supported and stretched on the inner circumferential surface of the frame members 13A-13C.
  • support rods 16,16 which project from the upper ends of the rear legs 3a,3b of the right and left side legs 3 of the leg unit 2 are inserted into holes 15 in the lower end of the right and left frame members 13C,13C of the backrest frame 13, so that the backrest 7 is mounted to stand on the back part of the seat 6.
  • the upper frame member 13A and lower frame member 13B of the backrest frame 13 curve backward when viewed from the above.
  • the right and left side frame members 13C each bends to project forward in the middle when viewed from the side.
  • a pair of shape-maintaining members 17,17 is symmetrically disposed between the lower frame member 13B close to the side and a bent portion 13a of the right and left side frame members 13C,13C, and the lower sides of the elastic membrane 14 are supported by the shape-maintaining member 17.
  • the shape-maintaining member 17 is molded together with the backrest frame 13 and elastic membrane 14 when the backrest 7 is molded.
  • FIG. 9 is an enlarged horizontal sectional view of the backrest taken along the line IX-IX in FIG. 4 ;
  • FIG. 10 is an enlarged horizontal sectional view taken along the line X-X in FIG. 4 ;
  • FIG. 11 is an enlarged vertical sectional view taken along the line XI-XI in FIG. 4 .
  • an upper edge 14a is held on the inner circumferential surface of the upper frame member 13A; and a lower edge 14b is held on the inner circumferential surface of the lower frame member 13C of the side frame member 13C.
  • the elastic membrane 14 is curved to project forward in the middle in FIG. 11 and like an arc which projects backward in FIG. 9 when viewed from the above
  • the elastic membrane 14 is stretched and supported on the lower part to the shape-maintaining member 17 provided between the part of the lower frame member 13B close to the bent portion 13a of the right and left side frame members 13C,13C in FIG. 10 , causing a forward elastic returning force obtained at the elastic membrane 14 close to the bent portion 13a of the right and left side frame members13C, or a restraining force as shown by an arrow in FIG. 11 restraining tension for getting near a flat surface forward by forming an arc projecting backward when viewed from the above.
  • the shape-maintaining member 17 supports the back surface of the elastic membrane 14 to press forward thereby applying restraining force against a direction of elastic returning force of the elastic membrane 14.
  • the curve of the elastic membrane 14 close to the bent portion 13a of the right and left side frame member 13C can be maintained for a long time.
  • a curving point C is higher than a bending point C0 of the side frame member 13C.
  • the curving point C is higher than the bending point C0 of the side frame member 13C in a position close to the lower part of a back bone of the user to press lumbar of the user, so that the user can be held in more stable straight sitting posture.
  • the upper frame member 13A is formed like an arc that projects backward.
  • forward elastic returning force is produced close to the bent portion 13a.
  • the upper frame member 13A is straight when viewed from the above, forward elastic returning force is not produced, but the back surface of the elastic membrane comes closer to the flat surface to cause restoration force for pushing back.
  • restraining force for pushing the elastic membrane forward is applied by the right and left shape-maintaining member 17 enabling the vertical curve of the elastic membrane 14 to be kept for a long time.

Landscapes

  • Chair Legs, Seat Parts, And Backrests (AREA)

Claims (5)

  1. Dossier (7) pour une chaise (1), le dossier (7) comprenant un bâti de dossier (13) sensiblement rectangulaire comprenant des éléments de bâti supérieur (13A), inférieur (13B), droit et gauche (13C) et une membrane élastique (14) étirée dans le bâti de dossier (13), dans lequel les éléments de bâti droit et gauche (13C) du bâti de dossier (13) sont pliés au niveau d'un point de pliage (13a) de sorte qu'un milieu de chacun des éléments de bâti fait légèrement saillie vers l'avant lorsqu'il est observé depuis un côté, la membrane élastique (14) étant étirée de sorte qu'un milieu est incurvé au niveau d'un point incurvé vers l'avant, lorsqu'elle est observée depuis le côté, le dossier (7) comprenant en outre une paire d'éléments à mémoire de forme (17), dont chacun est prévu de manière oblique vers l'extérieur et vers le haut entre la partie pliée (13a) de chacun des éléments latéraux droit et gauche (13C) et une partie de l'élément de bâti inférieur (13B) proche de chacun des éléments de bâti latéraux droit et gauche (13C), la membrane élastique étant supportée au niveau des extrémités inférieures des parties latérales droite et gauche par l'élément à mémoire de forme, caractérisé en ce que le bâti de dossier (13) est moulé conjointement avec les éléments à mémoire de forme (17) et la membrane élastique (14).
  2. Dossier (7) selon la revendication 1, dans lequel le point incurvé de la membrane élastique (14) est supérieur au point plié (13a) du bâti latéral.
  3. Dossier (7) selon la revendication 1, dans lequel l'élément de bâti supérieur (13A) est formé comme un arc légèrement en saillie vers l'arrière, lorsqu'il est observé de dessus.
  4. Dossier (7) selon la revendication 1, dans lequel l'élément de bâti supérieur (13A) est formé droit lorsqu'il est observé de dessus.
  5. Dossier (7) selon la revendication 1, dans lequel l'élément de bâti inférieur (13B) est formé comme un arc légèrement en saillie vers l'arrière lorsqu'il est observé de dessus.
EP11857303.9A 2011-01-27 2011-01-27 Dispositif de dossier de chaise Not-in-force EP2668871B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2011/051607 WO2012101803A1 (fr) 2011-01-27 2011-01-27 Dispositif de dossier de chaise

Publications (3)

Publication Number Publication Date
EP2668871A1 EP2668871A1 (fr) 2013-12-04
EP2668871A4 EP2668871A4 (fr) 2014-08-27
EP2668871B1 true EP2668871B1 (fr) 2017-07-19

Family

ID=46580406

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11857303.9A Not-in-force EP2668871B1 (fr) 2011-01-27 2011-01-27 Dispositif de dossier de chaise

Country Status (4)

Country Link
US (1) US20130313884A1 (fr)
EP (1) EP2668871B1 (fr)
CN (1) CN103391733A (fr)
WO (1) WO2012101803A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107087916A (zh) * 2017-07-06 2017-08-25 姚燕芳 人体工学椅子

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US3512831A (en) * 1964-08-24 1970-05-19 Hyland C Flint Spring seat
GB1126734A (en) * 1965-04-09 1968-09-11 Pirelli Ltd Articles of furniture upholstery supports and a method of mounting said supports
GB1133701A (en) * 1965-04-21 1968-11-13 Pirelli Ltd Articles of furniture, upholstery supports and a method of mounting said supports
JPS6270851U (fr) * 1985-10-25 1987-05-06
JPH01199426A (ja) 1988-02-04 1989-08-10 Canon Inc 半導体装置の製造方法
JP3200409B2 (ja) 1998-04-06 2001-08-20 愛知株式会社 シート張設方法、椅子の座、および背凭
JP3993375B2 (ja) * 2000-10-16 2007-10-17 コクヨ株式会社 椅子
JP4477766B2 (ja) * 2000-10-30 2010-06-09 株式会社岡村製作所 椅子の背板
JP2002219985A (ja) * 2001-01-24 2002-08-06 Delta Tooling Co Ltd 乗物用シート
US7014269B2 (en) * 2001-06-15 2006-03-21 Hon Technology Inc. Chair back construction
US6983997B2 (en) * 2001-06-29 2006-01-10 Haworth, Inc. Chair having a suspension seat assembly
US6550866B1 (en) * 2002-01-24 2003-04-22 Tung-Hua Su Chair backrest with ventilating function
AU2003212838A1 (en) * 2002-01-28 2003-09-02 Andrew J. Kurrasch Sacral support member for seating
US6698830B1 (en) * 2002-12-31 2004-03-02 Ronald K. Gaines Portable seat and storage apparatus
US20040262975A1 (en) * 2003-06-27 2004-12-30 Tung-Hua Su Backrest assembly
JP4652767B2 (ja) * 2004-10-13 2011-03-16 株式会社岡村製作所 椅子の背凭れ等における張材の張設構造
JP4448487B2 (ja) * 2005-11-04 2010-04-07 株式会社岡村製作所 椅子の背凭れ装置
JP4904519B2 (ja) * 2006-01-30 2012-03-28 コクヨ株式会社 椅子
WO2008112918A1 (fr) * 2007-03-13 2008-09-18 Hni Technologies Inc. Système de support lombaire dynamique pour dossier de chaise
EP2215931A4 (fr) * 2007-11-02 2011-04-13 Okamura Corp Dossier de siège et son dispositif de fixation
JP5472964B2 (ja) * 2008-09-12 2014-04-16 コクヨ株式会社 椅子
WO2010050204A1 (fr) * 2008-10-29 2010-05-06 株式会社岡村製作所 Dossier de chaise
JP5437724B2 (ja) * 2009-07-27 2014-03-12 株式会社岡村製作所 椅子の背凭れ装置
KR101549993B1 (ko) * 2010-02-10 2015-09-03 오카무라 가부시키가이샤 의자용 씌우개의 인장 설치 구조

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Also Published As

Publication number Publication date
EP2668871A1 (fr) 2013-12-04
US20130313884A1 (en) 2013-11-28
WO2012101803A1 (fr) 2012-08-02
CN103391733A (zh) 2013-11-13
EP2668871A4 (fr) 2014-08-27

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