JP2009165659A - Chair - Google Patents

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Publication number
JP2009165659A
JP2009165659A JP2008007398A JP2008007398A JP2009165659A JP 2009165659 A JP2009165659 A JP 2009165659A JP 2008007398 A JP2008007398 A JP 2008007398A JP 2008007398 A JP2008007398 A JP 2008007398A JP 2009165659 A JP2009165659 A JP 2009165659A
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Prior art keywords
shell
frame
chair
support
supports
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JP2008007398A
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JP5347141B2 (en
Inventor
Nobuyuki Ueda
伸行 上田
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Kokuyo Co Ltd
コクヨ株式会社
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Priority to JP2008007401A priority Critical patent/JP5347142B2/en
Priority to JP2008007398A priority patent/JP5347141B2/en
Priority claimed from CN200880124858.1A external-priority patent/CN101951812B/en
Publication of JP2009165659A publication Critical patent/JP2009165659A/en
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    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47CCHAIRS; SOFAS; BEDS
    • A47C1/00Chairs adapted for special purposes
    • A47C1/02Reclining or easy chairs
    • A47C1/031Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03255Reclining 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
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47CCHAIRS; SOFAS; BEDS
    • A47C1/00Chairs adapted for special purposes
    • A47C1/02Reclining or easy chairs
    • A47C1/031Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03261Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means
    • A47C1/03266Reclining 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
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47CCHAIRS; SOFAS; BEDS
    • A47C1/00Chairs adapted for special purposes
    • A47C1/02Reclining or easy chairs
    • A47C1/031Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03261Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means
    • A47C1/03272Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with coil springs
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47CCHAIRS; SOFAS; BEDS
    • A47C1/00Chairs adapted for special purposes
    • A47C1/02Reclining or easy chairs
    • A47C1/031Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03261Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means
    • A47C1/03277Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with bar or leaf springs
    • A47C1/03279Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with bar or leaf springs of torsion type
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47CCHAIRS; SOFAS; BEDS
    • A47C1/00Chairs adapted for special purposes
    • A47C1/02Reclining or easy chairs
    • A47C1/031Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03294Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest slidingly movable in the base frame, e.g. by rollers

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chair which enforces no special operation while simplifying the structure by making a special mechanism to project a lumbar supporting portion forward needless when it is moving from a normal condition where a load is imposed on the backrest to the back tilting condition where only the backrest is tilted rearward. <P>SOLUTION: A back supporting rod 6 pivoting a lower end on a supporting base 3 arranged below a seat and supporting a back shell 71 comprises an upper back frame 61 supporting the region of the back shell 71 above the lumbar supporting portion 71L capable of supporting the waist of a sitter and a lower back frame 62 supporting the region of the back shell 71 in the vicinity of the lower end, and is structured so as to overall bend and deform to ensure that the back shell 71 projects the lumbar supporting portion 71L relatively forward following the actions of pivotally connecting the back frames, setting a pivoting point in the lower end side rear of the back shell 71 and rearward inclining of the upper back frame 61 around the pivoting point with respect to the lower back frame 62. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、オフィス等で好適に用いられる椅子に関するものである。   The present invention relates to a chair suitably used in an office or the like.
従来より、オフィス等で好適に用いられる椅子として、背凭れの後傾動作に伴って座が後方へ沈み込む方向へスライド移動可能ないわゆるシンクロロッキング機能を有する椅子が知られている。   Conventionally, as a chair suitably used in an office or the like, a chair having a so-called synchro-rocking function is known in which a seat can be slid in a direction in which the seat sinks backward as the back leans backward.
このような椅子の一例として、背シェルを背支桿によって支持し、当該背支桿の下端部を前方へ延出させ、この延出端を脚体の上部に設けた支持基部に水平軸回りに回動可能に枢支し、背シェルに掛かる荷重に応じて背支桿が後傾する動作に伴って、背シェルのうち着座者の腰部を支持し得るランバーサポート部が前方へ突出するように背シェルを湾曲変形させるようにしたものが挙げられる(例えば下記特許文献1参照)。   As an example of such a chair, the back shell is supported by a back support rod, the lower end portion of the back support rod is extended forward, and the extended end is supported around the horizontal axis on the support base provided at the upper portion of the leg. The lumbar support part that can support the lumbar part of the seated person of the back shell protrudes forward as the back support arm tilts backward according to the load applied to the back shell. (1) (for example, see Patent Document 1 below).
下記特許文献1には、背凭れ(背シェル)の上部を、背支桿の上部に設けた軸に回動可能に支持させるとともに、背凭れの左右両側部の後面下部に、それぞれ側面視L字状のカム溝を有する案内片を固着し、操作レバーを操作して当該操作レバーに一体に設けた傾動片をカム溝内で移動させることにより、前記ランバーサポート部の前方への突出量を調整できるようにした態様が開示されている。
特開2004―49719号公報
In the following Patent Document 1, the upper part of the backrest (back shell) is rotatably supported by a shaft provided on the upper part of the back support bar, and the rear side lower parts of the right and left sides of the backrest are respectively viewed in side view L. The guide piece having the letter-shaped cam groove is fixed, and the operation lever is operated to move the tilting piece provided integrally with the operation lever within the cam groove, thereby reducing the forward protrusion amount of the lumbar support portion. An embodiment that can be adjusted is disclosed.
JP 2004-49719 A
しかしながら、上述した従来のものは、ランバーサポート部を前方に突出せるための専用の機構が必須であり、構造の複雑化を招来する上、着座者(使用者)に特別な操作を強いるものとなり、使い慣れるまでに時間も要し、実用性に劣るという問題がある。   However, the above-described conventional device requires a dedicated mechanism for projecting the lumbar support part forward, which causes a complicated structure and imposes a special operation on the seated person (user). It takes time to get used to it, and there is a problem that it is inferior in practicality.
また、上述した椅子は背凭れの後傾動作に伴って座が連動するシンクロロッキング機能を有するものである一方、背シェルを湾曲変形させて背凭れのみを後傾させる背チルト機能は有さないものである。仮に、背チルト機能を有する椅子に上述した構成を組み合わせた場合であっても、ランバーサポート部を前方に突出せるための専用の機構が必須である点、及び着座者(使用者)に特別な操作を強いる点は同様であり、やはり実用性に劣るものとなる。   In addition, the above-mentioned chair has a synchro-rocking function in which the seat is interlocked with the back tilting action of the backrest, while it does not have a back tilt function for bending only the backrest by bending the back shell. Is. Even if the above-described configuration is combined with a chair having a back tilt function, a special mechanism for projecting the lumbar support portion forward is essential, and it is special for the seated person (user). The point of forcing operation is the same, and it is also inferior to practicality.
本発明は、このような課題に着目してなされたものであって、主たる目的は、シンクロロッキング機能のみならず、背チルト機能も有する椅子であって、背凭れに荷重が掛かっていない通常状態から背凭れのみを後傾させた背チルト状態へ移行した際にランバーサポート部を前方へ突出させるための専用の機構を必要とせず、構造の簡素化を図ることができるとともに、着座者にランバーサポート部を前方へ突出させるための特別な操作を強いることのない実用性に優れた椅子を提供することにある。   The present invention has been made paying attention to such a problem, and the main purpose is a chair having not only a synchro-rocking function but also a back tilt function, and a normal state in which no load is applied to the backrest. This eliminates the need for a special mechanism for projecting the lumbar support part forward when shifting from the back to the back tilt state in which only the backrest is tilted backwards. An object of the present invention is to provide a chair with excellent practicality that does not impose a special operation for projecting the support portion forward.
すなわち、本発明の椅子は、弾性変形可能な背シェルを主体としてなる背凭れの後傾動作に伴って、座が連動するものであって、前記座の下方に配した支持基部に下端部又は下端部近傍部位を枢支させ且つ前記背シェルを支持する背支桿が、前記背シェルのうち着座者の腰部を支持し得るランバーサポート部よりも上方の部位を支持する上部背フレームと、前記背シェルの下端部又は下端部近傍部位を支持する下部背フレームとを備え、これら背フレーム同士を枢着し、当該枢着点を前記背シェルの下端部側における後方に設定したものであり、当該枢着点を中心に前記上部背フレームが前記下部背フレームに対して後傾する動作に伴って、前記背シェルが前記ランバーサポート部を相対的に前方へ突出させるように全体的に湾曲変形することを特徴とする。   That is, the chair of the present invention is such that the seat is interlocked with a back tilting operation mainly composed of a back shell that can be elastically deformed, and the lower end or the support base arranged below the seat. An upper back frame that supports a portion above the lumbar support portion that can support a waist of a seated person in the back shell, the back support rod that pivotally supports a portion near the lower end and supports the back shell, A lower back frame that supports the lower end portion of the back shell or the vicinity of the lower end portion, and these back frames are pivotally attached to each other, and the pivot point is set to the rear on the lower end side of the back shell, As the upper back frame tilts backward with respect to the lower back frame around the pivot point, the entire shell is curved and deformed so that the back shell protrudes relatively forward. To do The features.
このようなものであれば、背凭れの後傾動作に伴って座が連動するシンクロロッキング機能と、背シェルを湾曲変形させて背凭れのみを後傾させる背チルト機能とを有する椅子になるとともに、背シェルのうちランバーサポート部より上方の部位、換言すれば背シェルの上部を支持する上部背フレームと、背シェルの下端部又は下端部近傍部位を支持する下部背フレームとの枢着点を背シェルの下端部側における後方に設定しているため、着座者が意図して背シェルの上部に体重を掛けた場合に、上部背フレームが前記枢着点を中心に後傾し、これに伴って背シェルのうち上部側が後方へ反り返り、その結果、背シェルの上部と下部との間の領域、具体的にはランバーサポート部が自ずと前方へ突出する方向に湾曲変形し、着座者に良好な腰当り感を与えることができる。しかも、背シェルの上部に体重を掛ける程度に応じてランバーサポート部の前方への突出量も変化するため、別途専用の操作部を操作することなく、着座者は自身の体重の掛け方を変更することによって好みの腰当り感が得られるランバーサポート部の突出量に設定することができ、構造の簡素化を図りつつ何ら実用性を損なうことのない椅子となる。   If it is such, it will become a chair having a synchro-rocking function in which the seat is interlocked with the back tilting action of the backrest and a back tilt function in which only the backrest is tilted backward by curving and deforming the back shell. The pivot point between the upper part of the back shell above the lumbar support part, in other words, the upper back frame that supports the upper part of the back shell, and the lower back frame that supports the lower part of the back shell or the part near the lower part. Since it is set to the rear on the lower end side of the back shell, when the seated person intentionally puts weight on the upper part of the back shell, the upper back frame tilts backward about the pivot point, As a result, the upper part of the back shell warps backward, and as a result, the region between the upper and lower parts of the back shell, specifically, the lumbar support part naturally curves and deforms to protrude forward, which is good for the seated person. Hip Ri feeling can give. In addition, the amount of protrusion to the front of the lumbar support part changes depending on how much weight is applied to the upper part of the back shell, so the seated person can change how to put his weight without operating a separate operation part. By doing so, it is possible to set the projection amount of the lumbar support part that gives a desired feeling of waist contact, and the chair can be made without any loss of practicality while simplifying the structure.
このように、ランバーサポート部を前方へ突出させるための専用の機構を設ける必要がないため、構造の簡素化を有効に図ることができるとともに、ランバーサポート部を前方へ突出させるための特別な操作、或いはランバーサポート部の突出量を調整するための特別な操作を行う必要もないため、着座者にとっても使い勝手に優れたものとなる。   In this way, since it is not necessary to provide a dedicated mechanism for projecting the lumbar support part forward, it is possible to effectively simplify the structure and to perform a special operation for projecting the lumbar support part forward. Alternatively, since it is not necessary to perform a special operation for adjusting the protruding amount of the lumbar support portion, it is excellent in usability for the seated person.
特に、前記上部背フレーム又は前記下部背フレームの何れか一方の背フレームが、前記枢着点から所定方向に延出するオーバーハング部を備えたものであり、当該オーバーハング部と他方の背フレームとの間に、前記上部背フレームの後傾動作に伴って反力を発生する弾性体を配していれば、上部背フレームが下部背フレームに対して単独で後傾する背チルト動作専用の反力機構をコンパクトなものとすることができる。   In particular, one of the upper back frame and the lower back frame has an overhang portion extending in a predetermined direction from the pivot point, and the overhang portion and the other back frame If an elastic body that generates a reaction force along with the backward tilting operation of the upper back frame is disposed between the upper back frame and the back tilting operation, the upper back frame is tilted backward with respect to the lower back frame. The reaction force mechanism can be made compact.
ランバーサポート部が上部背フレームに干渉することによってランバーサポート部の前方への凸変形が抑制されることを防止するには、前記上部背フレームと前記背シェルの前記ランバーサポート部との間に、前記背凭れの後傾動作時における前記シェルの湾曲変形を許容する空間を形成すればよい。   To prevent the lumbar support portion from interfering with the upper back frame to prevent the convex deformation of the lumbar support portion forward, the lumbar support portion between the upper back frame and the back shell, What is necessary is just to form the space which accept | permits the curve deformation | transformation of the said shell at the time of the back tilting operation | movement of the backrest.
さらに、前記上部背フレーム又は前記下部背フレームの少なくとも一方が、前記背シェルを高さ方向にスライド移動可能に係合させた状態で支持するものであれば、着座者が背シェルの上部に体重を掛けて、上部背フレームが枢着点を中心に後傾した際に、背シェルが上部背フレーム又は前記下部背フレームの少なくとも一方の背フレームに対して高さ方向にスライド移動することによって、背支桿に対する背シェル全体の湾曲変形をスムーズに行わせることができる。   Furthermore, if at least one of the upper back frame or the lower back frame supports the back shell in a state in which the back shell is slidably engaged in the height direction, the seated person can place weight on the upper portion of the back shell. When the upper back frame tilts backward about the pivot point, the back shell slides and moves in the height direction with respect to at least one of the upper back frame or the lower back frame, The curved deformation of the entire back shell relative to the back support rod can be performed smoothly.
また、前記背シェルの左右巾方向略中央部に前記上部背フレーム及び前記下部背フレームからなる一組の前記背支桿を配している態様であれば、背シェルの両側端部がフリーな状態になり、樹脂製の板状部材である背シェルが着座者の背荷重を支える強度に構成されたものであっても、背シェルの左右両端部に荷重を掛けた場合にはその荷重に応じて柔軟に大きく撓ませることができる。このように、背シェルの捻れ変形を許容し、着座者の体重の掛け方や背中の動きに応じた背シェルの3次元的な変形が可能となる。   In addition, if the pair of back support rods composed of the upper back frame and the lower back frame are arranged at a substantially central portion in the lateral width direction of the back shell, both side ends of the back shell are free. Even if the back shell, which is a plate member made of resin, is constructed to have a strength that supports the back load of the seated person, if the load is applied to the left and right ends of the back shell, It can flex flexibly and flexibly. In this way, twisting deformation of the back shell is allowed, and three-dimensional deformation of the back shell according to how the seated person's weight is applied and the movement of the back is possible.
着座者が背シェルの上部に体重を掛けて上部背フレームが枢着点を中心に後傾した際、背シェル全体が湾曲変形しながらランバーサポート部を確実に前方へ突出させることができるようにするには、前記背シェルの変形特性を方向付けるために前記背シェルの前記ランバーサポート部に、当該ランバーサポート部の周辺部位よりも部分的に変形し易くした変形惹起手段を設けることが好ましい。   When the occupant puts his weight on the upper part of the back shell and the upper back frame tilts backward around the pivot point, the lumbar support part can be surely projected forward while the whole back shell curves and deforms In order to direct the deformation characteristics of the back shell, it is preferable that the lumbar support portion of the back shell is provided with deformation inducing means that is more easily deformed than the peripheral portion of the lumbar support portion.
変形惹起手段の好適な実施態様としては、前記背シェルの左右巾方向に延びる一又は複数のスリットによって変形惹起手段を構成した態様が挙げられる。   A preferred embodiment of the deformation inducing means includes an aspect in which the deformation inducing means is constituted by one or a plurality of slits extending in the lateral width direction of the back shell.
以上説明したように本発明によれば、シンクロロッキング機能のみならず、背チルト機能も有する椅子において、背凭れに荷重が掛かっていない通常状態から背凭れのみを後傾させた背チルト状態へ移行した際にランバーサポート部を前方へ突出させるための専用の機構が不要であり、構造の簡素化を図ることができるとともに、着座者にランバーサポート部を前方へ突出させるための特別な操作を強いることのない実用性に優れた椅子を提供することができる。   As described above, according to the present invention, in a chair having not only a synchro-rocking function but also a back tilt function, a transition is made from a normal state in which no load is applied to the backrest to a back tilt state in which only the backrest is tilted backward. This eliminates the need for a dedicated mechanism for projecting the lumbar support part forward, which simplifies the structure and forces the seater to perform a special operation for projecting the lumbar support part forward. A chair with excellent practicality can be provided.
以下、本発明の一実施形態を、図面を参照して説明する。   Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
本実施形態に係る椅子1は、図1〜図5に示すように、脚2と、脚2の上端側に水平旋回可能に取り付けた支持基部3と、前部を支持基部3に支持させた座受4と、座受4に取り付けた座5と、下端部を支持基部3に枢支させ且つ座受4の後部を支持する背支桿6と、背支桿6に取り付けた背凭れ7とを備えたいわゆる回転椅子である。   As shown in FIGS. 1 to 5, the chair 1 according to the present embodiment has a leg 2, a support base 3 attached to the upper end side of the leg 2 so as to be horizontally pivotable, and a front part supported by the support base 3. A seat receiver 4, a seat 5 attached to the seat receiver 4, a back support rod 6 that pivotally supports the lower end portion of the support base 3 and supports the rear portion of the seat receiver 4, and a backrest 7 attached to the back support rod 6. And so-called swivel chair.
脚2は、先端にキャスタをそれぞれ備えた複数本(図示例では5本)の脚羽根21と、各脚羽根21の基端部が集合する部位から起立する脚支柱22とからなるものである。   The leg 2 is composed of a plurality of (five in the illustrated example) leg blades 21 each having a caster at the tip, and leg struts 22 standing from a portion where the base ends of the leg blades 21 are gathered. .
支持基部3は、図6(同図は図5における矢印X方向から見た状態を示す図である)に示すように、上壁部31とこの上壁部31の両側縁からそれぞれ一体に屈曲垂下させた一対の垂下側壁部32と、一対の垂下側壁部32の前端部間に設けた補強リブとして機能する一対の隔壁33,34とを備えた例えば金属製のもので、前記上壁部31の後端部に脚支柱22の上端部を取り付けて脚支柱22に支持させている。なお、一対の隔壁33,34のうち相対的に後方側の隔壁33には、肉厚方向に穿設したリテーナ案内部33aを設け、当該リテーナ案内部33aに挿通したリテーナ912bを、後述するコイルバネ911の圧縮進退方向に進退するように案内するようにしている。またこの支持基部3は、左右の垂下側壁部32の略中央部より若干後方側に寄った部位間に、背支桿6を回動可能に軸支する第1支軸X1を横架させている。さらに、左右の垂下側壁部32の前端部には、後述する座受4の前フレーム(図示省略)を支持するための長孔32aをそれぞれ肉厚方向に穿設させている。支持基部3には下方から支持基部カバー体3cが被せられ、直接外観できないようにしてある(図3参照)。   The support base 3 is integrally bent from the upper wall portion 31 and both side edges of the upper wall portion 31, as shown in FIG. The upper wall portion is made of, for example, a metal having a pair of suspended sidewall portions 32 and a pair of partition walls 33 and 34 functioning as reinforcing ribs provided between the front end portions of the pair of suspended sidewall portions 32. The upper end portion of the leg column 22 is attached to the rear end portion of 31 and supported by the leg column 22. In addition, the partition 33 on the relatively rear side of the pair of partitions 33 and 34 is provided with a retainer guide portion 33a drilled in the thickness direction, and a retainer 912b inserted through the retainer guide portion 33a is used as a coil spring described later. 911 is guided to advance and retreat in the compression advance / retreat direction. The support base 3 has a first support shaft X1 that pivotally supports the back support rod 6 so that the back support rod 6 can be pivoted between the portions of the left and right hanging side wall portions 32 that are slightly rearward from the substantially central portion. Yes. Further, elongated holes 32a for supporting a front frame (not shown) of the seat receiver 4 to be described later are formed in the front end portions of the left and right hanging side wall portions 32 in the thickness direction. The support base 3 is covered with a support base cover body 3c from below so that it cannot be directly seen (see FIG. 3).
座受4は、前記支持基部3の上方に配され、前端部に設けた図示しない棒状の前フレームを支持基部3の長孔32aに挿通させた状態で支持基部3に支持されている。本実施形態の椅子1は、座受4の左右両側縁部近傍部位からそれぞれ上方に向かって延びる肘掛け8を備えている。図1等に示す肘掛け8は、高さ調整不能なものであるが、これに替えて、高さ調整可能な肘掛けを適用しても構わない。また、肘掛けを有さない椅子であってもよい。   The seat receiver 4 is disposed above the support base 3 and supported by the support base 3 in a state where a rod-shaped front frame (not shown) provided at the front end is inserted into the long hole 32 a of the support base 3. The chair 1 of this embodiment includes armrests 8 that extend upward from the vicinity of the left and right side edges of the seat 4. The armrest 8 shown in FIG. 1 and the like cannot be adjusted in height, but instead of this, an armrest that can be adjusted in height may be applied. Moreover, the chair which does not have an armrest may be sufficient.
座5は、当該座5に掛かる荷重を均等に支持する構造部材としての役割を担う座シェル51と、座シェル51の上方に設けられる座クッション(図示省略)と、座クッションを被覆する座クッションカバー52とを具備したものである。   The seat 5 includes a seat shell 51 that plays a role as a structural member that uniformly supports the load applied to the seat 5, a seat cushion (not shown) provided above the seat shell 51, and a seat cushion that covers the seat cushion. And a cover 52.
背凭れ7は、この背凭れ7に掛かる荷重を均等に支持する構造部材としての役割を担い背支桿6に支持される背シェル71と、背シェル71の前方に設けられる背クッション(図示省略)と、この背クッションを被覆する背クッションカバー72とを備えたものである。   The backrest 7 plays a role as a structural member that uniformly supports the load applied to the backrest 7 and is supported by the back support 6 and a back cushion (not shown) provided in front of the back shell 71. ) And a back cushion cover 72 that covers the back cushion.
背シェル71は、樹脂製の弾性板状体を主体として構成され、上部及び下部を高さ方向中央部よりも後方に突出させ、且つ左右両側縁部を左右巾方向中央部よりも前方に突出させた3次元形状をなすものである。背シェル71のうち着座者の腰部を支持し得るランバーサポート部71Lよりも上方の領域、より具体的には背シェル71の高さ方向中央部よりも上方の領域には、多数の開口711を設け、背シェル71の所定領域において開口711が占める割合である開口率が、背シェル71の上縁部及び両側縁部に向かって漸次大きくなるように設定している。以下の説明において、背シェル71のうち、開口711を設けた領域全体を「背シェル上部71T」と称す。つまり、背シェル71は、図4等に示すように、背シェル上部71Tと、背シェル71の高さ方向中央部である背シェル中央部71Sと、背シェル中央部71Sよりも若干下方に位置するランバーサポート部71Lと、ランバーサポート部71Lよりも下方の領域である背シェル下部71Uとを一体に有するものである。背シェル中央部71S、ランバーサポート部71L及び背シェル下部71Uの平面視における湾曲面の曲率は同じであり、この曲率を、背シェル上部71Tの平面視における湾曲面の曲率よりも大きく設定している。そして、図7(同図は図5に対応するものであり、背シェル71のみを左右巾方向中央縦断面で模式的に示す図である)に示すように、相対的に曲率が大きい背シェル中央部71S、ランバーサポート部71L及び背シェル下部71Uは、相互に連続する弓なりに湾曲した形状となる一方、相対的に曲率が小さい背シェル上部71Tは、高さ方向に沿って略直線状となる。なお、背シェル中央部71Sと背シェル上部71Tとは不連続線712を境界にして相互に連続している。   The back shell 71 is mainly composed of a resin elastic plate-like body, and the upper and lower portions protrude rearward from the central portion in the height direction, and the left and right side edge portions protrude forward from the central portion in the left-right width direction. It has a three-dimensional shape. A large number of openings 711 are provided in a region above the lumbar support portion 71L that can support the waist of the seated person in the back shell 71, more specifically, in a region above the center in the height direction of the back shell 71. The opening ratio, which is the ratio of the opening 711 in a predetermined region of the back shell 71, is set so as to gradually increase toward the upper edge and both side edges of the back shell 71. In the following description, the entire region of the back shell 71 provided with the opening 711 is referred to as “back shell upper portion 71T”. That is, as shown in FIG. 4 and the like, the back shell 71 is positioned slightly below the back shell upper portion 71T, the back shell central portion 71S that is the central portion in the height direction of the back shell 71, and the back shell central portion 71S. The lumbar support portion 71L and the back shell lower portion 71U, which is a region below the lumbar support portion 71L, are integrally provided. The curvature of the curved surface in plan view of the back shell central portion 71S, the lumbar support portion 71L, and the back shell lower portion 71U is the same, and this curvature is set larger than the curvature of the curved surface in plan view of the back shell upper portion 71T. Yes. 7 (this figure corresponds to FIG. 5 and is a diagram schematically showing only the back shell 71 in the central longitudinal section in the left-right width direction), and has a relatively large curvature. The central portion 71S, the lumbar support portion 71L, and the back shell lower portion 71U have a curved shape that is continuous with a bow, while the back shell upper portion 71T having a relatively small curvature has a substantially linear shape along the height direction. Become. The back shell central portion 71S and the back shell upper portion 71T are continuous with each other with a discontinuous line 712 as a boundary.
背シェル71のランバーサポート部71Lには、当該ランバーサポート部71Lの周辺部位よりも部分的に変形し易くした変形惹起手段713を設けている。本実施形態では、変形惹起手段713として、左右巾方向に延びるスリット713aを適用している。スリット713aの数は単数であっても複数であってもよく、本実施形態では、高さ方向に所定間隔空けてなる上下一対のスリット713aを設けている。   The lumbar support portion 71L of the back shell 71 is provided with a deformation inducing means 713 that can be partially deformed more easily than the peripheral portion of the lumbar support portion 71L. In the present embodiment, a slit 713a extending in the left-right width direction is applied as the deformation inducing means 713. The number of slits 713a may be singular or plural, and in the present embodiment, a pair of upper and lower slits 713a are provided that are spaced apart from each other in the height direction.
背シェル上部71Tには、図8(同図は図5のY領域における背シェル71と背支桿6との組み付け態様を示すべく、背シェル上部71Tを背支桿6に組み付ける前段階の状態を模式的に示す図である)に示すように、後方に突出し後述する上部背フレーム61の上端部に形成したスライド係合孔611に係合可能な係合部714を一体又は一体的に設けている。なお、図8では、背シェル上部71Tの開口711を省略している。係合部714は、概略ブロック状をなし、先端部(背シェル71の背面から離れた側の端部)に鍔部714aを一体に有するものである。   FIG. 8 shows a state before the back shell upper portion 71T is assembled to the back support rod 6 in order to show the manner of assembling the back shell 71 and the back support rod 6 in the Y region of FIG. As shown in FIG. 4, an engagement portion 714 that protrudes rearward and can be engaged with a slide engagement hole 611 formed at an upper end portion of the upper back frame 61 described later is integrally or integrally provided. ing. In FIG. 8, the opening 711 of the upper back shell 71T is omitted. The engaging portion 714 has a substantially block shape, and has a flange portion 714a integrally at the distal end portion (the end portion on the side away from the back surface of the back shell 71).
背シェル下部71Uには、図5等に示すように、後方に突出し後述する下部フレームの上端部に支持される被支持部715を一体又は一体的に設けている。本実施形態では、背シェル下部71Uにおける下端部、つまり背シェル71の下端部に左右一対の薄板状の被支持部715を設けている。   As shown in FIG. 5 and the like, the back shell lower portion 71U is integrally or integrally provided with a supported portion 715 that protrudes rearward and is supported by an upper end portion of a lower frame described later. In the present embodiment, a pair of left and right thin plate-like supported portions 715 are provided on the lower end portion of the back shell lower portion 71 </ b> U, that is, the lower end portion of the back shell 71.
このような背シェル71を支持する背支桿6は、図5等に示すように、背シェル71のうち着座者の腰部を支持するランバーサポート部71Lよりも上方の部位、具体的には前記背シェル上部71Tを支持する上部背フレーム61と、背シェル下部71Uを支持する下部背フレーム62とを備え、これら上部背フレーム61と下部背フレーム62との枢着点(後述する第3支軸X3)を前記背シェル71の下端部側における後方に設定し、当該枢着点を中心に上部背フレーム61が下部背フレーム62に対して傾動動作(チルト動作)可能に構成したものである。なお、図2に示すように、上部背フレーム61及び下部背フレーム62には、それぞれ後方又は下方から上部背フレームカバー体61c及び下部背フレームカバー体62cが被せられ、直接外観できないようにしてある。   As shown in FIG. 5 and the like, the back support rod 6 that supports the back shell 71 is a portion of the back shell 71 that is above the lumbar support portion 71L that supports the waist of the seated person. An upper back frame 61 that supports the back shell upper portion 71T and a lower back frame 62 that supports the back shell lower portion 71U are provided, and pivot points between the upper back frame 61 and the lower back frame 62 (third support shaft described later) X3) is set rearward on the lower end side of the back shell 71, and the upper back frame 61 is configured to be tiltable (tilted) with respect to the lower back frame 62 around the pivot point. As shown in FIG. 2, the upper back frame 61 and the lower back frame 62 are covered with an upper back frame cover body 61c and a lower back frame cover body 62c from the rear or below, respectively, so that they cannot be directly seen. .
下部背フレーム62は、図5及び図6等に示すように、支持基部3の両側面よりも外側方に配される左右一対の下部背フレーム本体621と、これら一対の下部背フレーム本体621の下端部同士を剛結し、且つ前記支持基部3の下面よりも下方に配される剛結軸622とを備えたものである。   As shown in FIGS. 5 and 6, the lower back frame 62 includes a pair of left and right lower back frame bodies 621 arranged on the outer side than both side surfaces of the support base 3, and the pair of lower back frame bodies 621. A rigid connection shaft 622 is provided that is rigidly connected to the lower ends and is disposed below the lower surface of the support base 3.
各下部背フレーム本体621は、概略板状をなし、下端部から上端部近傍部位に向かって漸次斜め後方に延出し、上端部近傍部位を斜め前方に屈曲させた側面視形状を有する。   Each lower back frame main body 621 is substantially plate-shaped, and has a side view shape that gradually extends obliquely rearward from the lower end portion toward the vicinity of the upper end portion and bends the vicinity of the upper end portion obliquely forward.
剛結軸622は、棒状をなし、溶接等の適宜の手段により下部背フレーム本体621の下端部間に架け渡した状態で固定されたものである。   The rigid connection shaft 622 has a rod shape and is fixed in a state of being bridged between the lower end portions of the lower back frame main body 621 by appropriate means such as welding.
このような下部背フレーム62を支持基部3に取り付けるには、左右一対の下部背フレーム本体621を剛結軸622によって剛結した状態で、各下部背フレーム本体621の下端部近傍部位同士の間に支持基部3を挟み込むように支持基部3の後方からあてがい、各下部背フレーム本体621の下端部近傍部位に設けた挿通孔621aと支持基部3の両垂下側壁部32に設けた図示しない挿通孔とを相互に連通させた状態で第1支軸X1を挿通させることによって行う。これにより、下部背フレーム62、ひいては背支桿6が、第1支軸X1を中心に支持基部3に対して回動可能なものとなる。なお、本実施形態では各下部背フレーム本体621の下端部近傍部位に他の部位よりも前方に延出させた延出部621bを一体に設け、各延出部621bに挿通孔621aを形成している。第1支軸X1は剛結軸622に対して、相対的に後方且つ上方に配される。   In order to attach such a lower back frame 62 to the support base 3, a pair of left and right lower back frame main bodies 621 are rigidly connected by a rigid connection shaft 622, and the lower portion of each lower back frame main body 621 is located between the vicinity of the lower end portions. An insertion hole (not shown) provided in both the side wall portions 32 of the support base 3 and the insertion hole 621a provided in the vicinity of the lower end of each lower back frame main body 621 so as to sandwich the support base 3 therebetween. Is performed by inserting the first support shaft X1 in a state where they are communicated with each other. As a result, the lower back frame 62 and thus the back support rod 6 can rotate with respect to the support base 3 about the first support shaft X1. In the present embodiment, an extension portion 621b that extends forward from the other portion is integrally provided in the vicinity of the lower end portion of each lower back frame main body 621, and an insertion hole 621a is formed in each extension portion 621b. ing. The first support shaft X1 is disposed rearward and upward relative to the rigid connection shaft 622.
本実施形態に係る椅子1は、下部背フレーム62を支持基部3に取り付けた状態において、下部背フレーム62の剛結軸622が支持基部3の下面(具体的には垂下側壁部32の下面)よりも下方に位置付けられ、この剛結軸622と支持基部3との間に背支桿6の後傾動作に伴って反力を発生するコイルバネ911を配している。そして、下部背フレーム62が前記第1支軸X1を中心に後傾した際に、剛結軸622がコイルバネ911を反発力を蓄積する方向に付勢するように構成している。   In the chair 1 according to this embodiment, in a state where the lower back frame 62 is attached to the support base 3, the rigid shaft 622 of the lower back frame 62 is the lower surface of the support base 3 (specifically, the lower surface of the hanging side wall portion 32). A coil spring 911 is disposed between the rigid coupling shaft 622 and the support base 3 and generates a reaction force in accordance with the backward tilting motion of the back support rod 6. When the lower back frame 62 is tilted rearward about the first support shaft X1, the rigid shaft 622 biases the coil spring 911 in the direction in which the repulsive force is accumulated.
具体的には、図6に示すように、剛結軸622が、その長手方向中央部で後述するコイルバネ911の一端側に設けたコイルばね受部911xを支持している。コイルバネ911及びコイルばね受部911xは、背支桿6を後傾させる際の反力を調整するための傾動反力調整装置9を構成するものである。   Specifically, as shown in FIG. 6, the rigid shaft 622 supports a coil spring receiving portion 911 x provided on one end side of a coil spring 911 described later at the center in the longitudinal direction. The coil spring 911 and the coil spring receiving portion 911x constitute the tilting reaction force adjusting device 9 for adjusting the reaction force when the back support rod 6 is tilted backward.
傾動反力調整装置9は、図5及び図6に示すように、支持基部3内に少なくとも一部が収容され、且つ背支桿6を後傾させる際の反力を座受4とは独立に発生させる反力発生部91と、座5の側縁前端側に設けられ、反力発生部91の反力の強さを調整操作するための反力調整用操作部92とを備えたものである。   As shown in FIGS. 5 and 6, the tilting reaction force adjusting device 9 is at least partially housed in the support base 3, and the reaction force when the back support rod 6 is tilted backward is independent of the seat support 4. And a reaction force adjusting operation unit 92 for adjusting the strength of the reaction force of the reaction force generating unit 91 provided on the side edge front end side of the seat 5. It is.
より具体的に説明すると、反力発生部91は、コイルバネ911と、このコイルバネ911の一端側に設けられ且つ前記反力調整用操作部92が受ける調整操作と連動して前記コイルバネ911を圧縮又は伸長させる圧縮伸長部912とを具備している。圧縮伸長部912は、前記反力調整用操作部92が受ける調整操作と連動してコイルバネ911の圧縮伸長方向と直交する方向に進退する平面視略台形状のスライダ912aと、このスライダ912aと摺動しつつ且つ前記コイルバネ911を支持しながら前記圧縮伸長方向に進退する平面視略台形状のリテーナ912bと、このリテーナ912bの前記圧縮伸長方向への進退を案内する前記リテーナ案内部33aとからなるものである。このリテーナ案内部33aは、上述した通り、座受4を支持するための支持基部3の隔壁33に形成されている。   More specifically, the reaction force generation unit 91 compresses or compresses the coil spring 911 in conjunction with a coil spring 911 and an adjustment operation provided on one end side of the coil spring 911 and received by the reaction force adjustment operation unit 92. And a compression / decompression unit 912 for decompression. The compression / extension unit 912 is a substantially trapezoidal slider 912a in plan view that moves forward and backward in a direction orthogonal to the compression / extension direction of the coil spring 911 in conjunction with the adjustment operation received by the reaction force adjustment operation unit 92, and the slider 912a and the slider 912a. A retainer 912b having a substantially trapezoidal shape in plan view that moves and supports the coil spring 911 and moves back and forth in the compression / extension direction, and the retainer guide portion 33a that guides the advance / retreat of the retainer 912b in the compression / extension direction. Is. As described above, the retainer guide portion 33a is formed in the partition wall 33 of the support base 3 for supporting the seat receiver 4.
反力調整用操作部92は、支持基部3の何れか一方の垂下側壁部32を貫通して左右巾方向に延びるロッド921と、このロッド921の先端部に設けられ且つロッド921を軸回りに回転させる操作グリップ922とを備えたものである。   The reaction force adjusting operation portion 92 includes a rod 921 that extends in the left-right width direction through one of the hanging side wall portions 32 of the support base 3, and a rod 921 that is provided at the distal end portion of the rod 921 and rotates around the rod 921. And an operation grip 922 to be rotated.
下部背フレーム62の説明に戻る。下部背フレーム62の各下部背フレーム本体621には、高さ方向中央部より若干下方の部位に周辺部位よりも前方に延出させた第2延出部621cを一体に設け、これら第2延出部621c同士に架け渡した状態で固定された第2支軸X2によって前記座受4の後端側を支持している。さらに、各下部背フレーム本体621の上端部近傍部位に、前記背シェル71の被支持部715をビス止め等の適宜の手段によって相対角度変更不能に固定している。   Returning to the description of the lower back frame 62. Each lower back frame main body 621 of the lower back frame 62 is integrally provided with a second extending portion 621c that extends forward from the peripheral portion at a position slightly below the central portion in the height direction. The rear end side of the seat receiver 4 is supported by a second support shaft X2 that is fixed in a state of being bridged between the protruding portions 621c. Furthermore, the supported portion 715 of the back shell 71 is fixed to a portion near the upper end of each lower back frame main body 621 by an appropriate means such as screwing so that the relative angle cannot be changed.
このような構成をなす下部背フレーム62の上端部に枢支される上部背フレーム61は、図5に示すように、前記左右一対の下部背フレーム本体621同士の間に挟まれる巾寸法を有し、上端部及び下端部を高さ方向中央部よりも後方に向かって突出させた側面視略くの字状をなすものである。上部背フレーム61の上端部には、図8に示すように、背シェル上部71Tに設けた前記係合部714がスライド係合可能なスライド係合孔611を形成している。スライド係合孔611は、係合部714の鍔部714aが挿脱可能な大孔部611aと、この大孔部611aの上方に連続して設けられ、大孔部611aから挿入した鍔部714aが抜け外れない状態で係合部714の相対スライド移動を許容し得る小孔部611bとから構成される。小孔部611bの高さ寸法を大孔部611aの高さ寸法よりも大きく設定し、スライド係合孔611と係合部714との相対スライド移動しろを確保している。   The upper back frame 61 pivotally supported by the upper end of the lower back frame 62 having such a configuration has a width dimension that is sandwiched between the pair of left and right lower back frame bodies 621 as shown in FIG. In addition, the upper end portion and the lower end portion are formed in a substantially U shape in a side view in which the upper end portion and the lower end portion are protruded rearward from the central portion in the height direction. As shown in FIG. 8, a slide engagement hole 611 in which the engagement portion 714 provided in the back shell upper portion 71T is slidably engageable is formed in the upper end portion of the upper back frame 61. The slide engagement hole 611 is continuously provided above the large hole 611a and the large hole 611a into which the flange 714a of the engagement part 714 can be inserted and removed, and the flange 714a inserted from the large hole 611a. And a small hole 611b that can allow the relative sliding movement of the engaging portion 714 in a state where it cannot be removed. The height dimension of the small hole part 611b is set to be larger than the height dimension of the large hole part 611a, and a margin for relative sliding movement between the slide engagement hole 611 and the engagement part 714 is secured.
上部背フレーム61の下端部には図示しない左右巾方向に貫通する挿通孔が形成されており、この挿通孔と各下部背フレーム本体621の上端部に設けた挿通孔621dとを相互に連通させた状態で第3支軸X3を挿通させることにより、上部背フレーム61が、第3支軸X3(本発明の「枢着点」に相当)を中心として後傾動作可能なものとなる。本実施形態では、第3支軸X3が、背シェル71の下端部側における後方に配されるように設定している。さらに、上部背フレーム61は、前記枢着点(第3支軸X3)よりも下方に延出するオーバーハング部612を備え、当該オーバーハング部612と下部背フレーム62との間に、上部背フレーム61の後傾動作に伴って反力を発生する本発明の弾性体たる第2コイルバネ63を配している。本実施形態では、下部背フレーム62の左右一対の下部背フレーム本体621のうち前記屈曲させた上端部近傍部位よりも若干下方側の部位同士の間に第4支軸X4を架け渡した状態で固定し、この第4支軸X4に第2コイルバネ63の一端部を支持させ、第2コイルバネ63の他端部を上部背フレーム61のオーバーハング部612に支持させている。   An insertion hole penetrating in the left-right width direction (not shown) is formed in the lower end portion of the upper back frame 61, and this insertion hole and the insertion hole 621d provided in the upper end portion of each lower back frame main body 621 are communicated with each other. By inserting the third support shaft X3 in this state, the upper back frame 61 can be tilted backward about the third support shaft X3 (corresponding to the “pivot point” of the present invention). In the present embodiment, the third support shaft X <b> 3 is set so as to be arranged rearward on the lower end side of the back shell 71. Further, the upper back frame 61 includes an overhang portion 612 that extends downward from the pivot point (third support shaft X3), and the upper back frame 61 is interposed between the overhang portion 612 and the lower back frame 62. A second coil spring 63 that is an elastic body of the present invention that generates a reaction force in association with the backward tilting operation of the frame 61 is provided. In the present embodiment, in a state where the fourth support shaft X4 is bridged between portions slightly below the bent upper end portion of the pair of left and right lower back frame main bodies 621 of the lower back frame 62. It is fixed, and one end portion of the second coil spring 63 is supported by the fourth support shaft X4, and the other end portion of the second coil spring 63 is supported by the overhang portion 612 of the upper back frame 61.
背シェル上部71T及び背シェル下部71Uをそれぞれ上部背フレーム61の上端部及び下部背フレーム62の上端部に支持させた状態において、背シェル71と背支桿6(具体的には上部背フレーム61)との間には空間が形成される。   With the back shell upper portion 71T and the back shell lower portion 71U supported by the upper end portion of the upper back frame 61 and the upper end portion of the lower back frame 62, respectively, the back shell 71 and the back support rod 6 (specifically, the upper back frame 61). A space is formed between
次に、上述した各部材から構成される本実施形態に係る椅子1の使用方法及び作用について説明する。   Next, the usage method and effect | action of the chair 1 which concerns on this embodiment comprised from each member mentioned above are demonstrated.
本実施形態に係る椅子1は、図1〜図5に示すように、背凭れ7が起立姿勢をとる通常状態(S)と、図9及び図10に示すように、背凭れ7の後傾動作に伴って、座5が連動して後方へ沈み込む方向へスライド移動するシンクロロッキング(シンクロチルト)状態(R)と、図11及び図12に示すように、通常状態(S)において着座者が意図して背凭れ7の上部に体重を掛けることにより、上部背フレーム61が第3支軸X3(本発明の枢着点)を中心に後傾し、これに伴って背シェル71全体が側面視において弓なりに湾曲変形する背チルト状態(T)とを少なくともとり得るものである。   As shown in FIGS. 1 to 5, the chair 1 according to the present embodiment is in a normal state (S) in which the backrest 7 takes a standing posture, and as shown in FIGS. 9 and 10, the backrest 7 is tilted backward. In accordance with the movement, the seat 5 is slid in the direction of sinking backward in a synchronized state (R) in which the seat 5 slides backward, and in the normal state (S) as shown in FIG. 11 and FIG. , The upper back frame 61 tilts backward about the third support shaft X3 (the pivot point of the present invention) and the entire back shell 71 is moved accordingly. At least a back tilt state (T) that curves and deforms like a bow in a side view can be taken.
通常状態(S)にある場合、弾性板状体を主体としてなる背シェル71は、その弾性に抗して側面視弓なりに湾曲した形状となっている。   When in the normal state (S), the back shell 71 mainly composed of an elastic plate-like body has a curved shape like a side view bow against the elasticity.
このような通常状態(S)にある椅子1に対して着座者が背中全体を背凭れ7に凭れ掛けさせた場合に、図10に示すように、背支桿6が、上部背フレーム61と下部背フレーム62との相対角度を維持したまま前記第1支軸X1を中心として後傾し、背シェル71も後傾する。この際、着座者の体重が背凭れ7全体に略均等に掛かることになるため、上部背フレーム61が下部背フレーム62に対して後傾することなく、換言すれば上部背フレーム61と下部背フレーム62との相対角度は変わらず、背シェル71も通常状態(S)における形状と略同一形状を保持したまま後傾する。そしてこの背支桿6の後傾動作に伴って下部背フレーム62の前記第2支軸X2によって後端側を支持された前記座受4が、その前端部に設けた前フレーム(図示省略)を長孔32a内で移動させながら後方へ沈み込む方向へスライド移動する。その結果、座受4に支持された座5全体が座受4と同一方向、すなわち後方へ沈み込む方向へスライド移動し(図9参照)、椅子1がシンクロロッキング状態(R)となる。   When a seated person leans the entire back on the backrest 7 with respect to the chair 1 in such a normal state (S), as shown in FIG. While maintaining the relative angle to the lower back frame 62, the back shell 71 tilts backward with the first support shaft X1 as the center. At this time, since the weight of the seated person is applied almost evenly to the entire backrest 7, the upper back frame 61 does not tilt backward with respect to the lower back frame 62, in other words, the upper back frame 61 and the lower back frame. The relative angle with the frame 62 does not change, and the back shell 71 also tilts backward while maintaining substantially the same shape as in the normal state (S). A front frame (not shown) provided at the front end of the seat support 4, the rear end of which is supported by the second support shaft X <b> 2 of the lower back frame 62 in accordance with the backward tilting operation of the back support rod 6. Is slid in the direction of sinking backward while moving in the long hole 32a. As a result, the entire seat 5 supported by the seat receiver 4 slides and moves in the same direction as the seat receiver 4, that is, in the direction of sinking backward (see FIG. 9), and the chair 1 enters the synchro-rocking state (R).
なお、シンクロロッキング状態(R)にある場合、下部背フレーム62の剛結軸622が、前記コイルバネ911を反発力を蓄積する方向に押圧するため、着座者が背中を背凭れ7から離す、つまり上半身を起こすと、コイルバネ911の反発力によって背支桿6全体が後傾する前の通常姿勢に自ずと復帰する。本実施形態では、前記傾動反力調整装置9によって背凭れ7を後傾させる際の反力を調整可能にしている。具体的には、操作グリップ922を時計回り又は反時計回りの何れか一方向(例えば時計回り)に回転させると、これと連動してスライダ912aが操作グリップ922に近づく方向に移動し、当該スライダ912aがリテーナ912bを押圧する。すると、スライダ912aに押圧されたリテーナ912bは、コイルバネ911を圧縮する向きに移動し、背凭れ7を後傾させる際の反力を大きくできる。一方、操作グリップ922を逆方向(例えば反時計回り)に回転させれば、背凭れ7を後傾させる際の反力を小さくできる。   In the synchro-rocking state (R), the rigid shaft 622 of the lower back frame 62 presses the coil spring 911 in the direction in which the repulsive force is accumulated, so that the seated person separates his back from the backrest 7, that is, When the upper body is raised, the entire back support 6 is automatically returned to the normal posture before being tilted backward by the repulsive force of the coil spring 911. In the present embodiment, the tilting reaction force adjusting device 9 can adjust the reaction force when the backrest 7 is tilted backward. Specifically, when the operation grip 922 is rotated in one of the clockwise and counterclockwise directions (for example, clockwise), the slider 912a moves in a direction approaching the operation grip 922 in conjunction with this, and the slider 912a presses the retainer 912b. Then, the retainer 912b pressed by the slider 912a moves in a direction in which the coil spring 911 is compressed, and the reaction force when the backrest 7 is tilted backward can be increased. On the other hand, if the operation grip 922 is rotated in the reverse direction (for example, counterclockwise), the reaction force when the backrest 7 is tilted backward can be reduced.
他方、通常状態(S)において着座者が意図して背シェル上部71Tに体重を掛けた場合、図12に示すように、背支桿6のうち上部背フレーム61が第3支軸X3を中心として下部背フレーム62に対して後傾する。この上部背フレーム61の後傾動作に伴って背シェル71のうち上部背フレーム61に支持された背シェル上部71Tには後方へ反り返ろうとする力が作用する一方で、下部背フレーム62に支持された背シェル71の下端部は、後傾しない下部背フレーム62によって通常状態(S)における位置に留まろうとするため、背シェル71は背シェル上部71Tと背シェル下部71Uとの間の部位を前方へさらに突出させるようにさらに弓なりに湾曲変形する。本実施形態では、背シェル71のランバーサポート部71Lに変形惹起手段713、具体的にはスリット713aを設けているため、背シェル71全体が弓なりに湾曲変形する際、スリット713aの開口高さを狭める方向にランバーサポート部71Lが変形し、その結果、当該ランバーサポート部71Lが、通常状態(S)にある場合と比較して相対的に前方へ突出する。また、本実施形態では、背シェル上部71Tを上部背フレーム61に高さ方向に相対スライド移動可能に係合支持させており、上部背フレーム61が後傾する際に、背シェル上部71Tに設けた前記係合部714を、上部背フレーム61の上端部に形成したスライド係合孔611内において当該スライド係合孔611に対する係合状態が解除されない範囲で高さ方向に相対スライド移動させることによって、上部背フレーム61の後傾動作に追従して背シェル71全体が湾曲変形できるようにしている。本実施形態の椅子1は、背シェル71のうち平面視における湾曲面の曲率が他の部位よりも小さく、高さ方向に沿って略直線状をなす背シェル上部71Tに上部背フレーム61の上端部を相対スライド移動させる態様であるため、当該スライド移動を安定した状態でスムーズに行うことが可能となる。   On the other hand, in the normal state (S), when the seated person intentionally puts weight on the back shell upper portion 71T, the upper back frame 61 of the back support rod 6 is centered on the third support shaft X3 as shown in FIG. As shown in FIG. Along with the backward tilting action of the upper back frame 61, the back shell upper portion 71T of the back shell 71 supported by the upper back frame 61 is acted on by the lower back frame 62 while a force is exerted to warp backward. Since the lower end portion of the back shell 71 tries to stay at the position in the normal state (S) by the lower back frame 62 that does not tilt backward, the back shell 71 is a portion between the back shell upper portion 71T and the back shell lower portion 71U. Is further curved and deformed so as to protrude further forward. In this embodiment, since the lumbar support portion 71L of the back shell 71 is provided with the deformation inducing means 713, specifically, the slit 713a, when the entire back shell 71 is curved and deformed like a bow, the opening height of the slit 713a is set. The lumbar support portion 71L is deformed in the narrowing direction, and as a result, the lumbar support portion 71L protrudes relatively forward as compared to the normal state (S). In this embodiment, the back shell upper portion 71T is engaged with and supported by the upper back frame 61 so as to be relatively slidable in the height direction, and is provided on the back shell upper portion 71T when the upper back frame 61 tilts backward. Further, the engaging portion 714 is relatively slid in the height direction within a range in which the engagement state with respect to the slide engaging hole 611 is not released in the slide engaging hole 611 formed in the upper end portion of the upper back frame 61. The entire back shell 71 can be curved and deformed following the backward tilting action of the upper back frame 61. The chair 1 of the present embodiment has a curved upper surface curvature in the back shell 71 that is smaller than that of the other portions, and is substantially straight along the height direction. Therefore, the sliding movement can be performed smoothly in a stable state.
椅子1の通常状態(S)から背チルト状態(T)への移行に伴って、上部背フレーム61のオーバーハング部612が、当該オーバーハング部612と下部背フレーム62との間に介在する第2コイルバネ63を反発力を蓄積する方向に押圧する。したがって、着座者が背中を背凭れ7から離す、つまり上半身を起こすと、第2コイルバネ63の反発力によって上部背フレーム61が後傾する前の通常姿勢に自ずと復帰し、椅子1が背チルト状態(T)から通常状態(S)に戻ることになる。また、椅子1が通常状態(S)から背チルト状態(T)に移行した際、通常状態(S)における形状よりもさらに弓なりに湾曲変形した背シェル71の弾性復帰力が上部背フレーム61を前方へ引っ張り戻す方向に付勢する力として作用する。したがって、椅子1が背チルト状態(T)にある場合に、着座者が意図してランバーサポート部71Lに体重を掛けると前記付勢力がさらに増大し、この付勢力と前記第2コイルバネ63の反発力とが相俟って、着座者が背中を背凭れ7から離す、つまり上半身を起こした際に、上部背フレーム61はその動作に追従して後傾する前の通常姿勢に素早く自動復帰することになる。   With the transition of the chair 1 from the normal state (S) to the back tilt state (T), the overhang portion 612 of the upper back frame 61 is interposed between the overhang portion 612 and the lower back frame 62. The two-coil spring 63 is pressed in the direction in which the repulsive force is accumulated. Therefore, when the seated person lifts his back from the backrest 7, that is, when the upper body is raised, the upper back frame 61 automatically returns to the normal posture before the rearward tilting by the repulsive force of the second coil spring 63, and the chair 1 is in the back tilt state. The normal state (S) is returned from (T). Further, when the chair 1 shifts from the normal state (S) to the back tilt state (T), the elastic return force of the back shell 71 that is curved and deformed more like a bow than the shape in the normal state (S) causes the upper back frame 61 to be restored. Acts as a force for energizing in the direction of pulling forward. Therefore, when the chair 1 is in the back tilt state (T), if the seated person intentionally puts his / her weight on the lumbar support portion 71L, the biasing force further increases, and the biasing force and the repulsion of the second coil spring 63 are increased. Combined with the force, when the occupant lifts his back from the backrest 7, that is, when the upper body is raised, the upper back frame 61 follows its movement and quickly automatically returns to the normal posture before tilting backward. It will be.
なお、椅子1を通常状態(S)から背チルト状態(T)へ移行させた後に、さらに着座者が体重を背凭れ7全体に掛けると、上部背フレーム61が下部背フレーム62に対して後傾した姿勢を保持しながら、下部背フレーム62が前記第1支軸X1を中心にして後傾する。その結果、椅子1が背チルト状態(T)とシンクロロッキング状態(R)とを組み合わせた最後傾状態となる(図示省略)。これと略同様に、通常状態(S)からシンクロロッキング状態(R)へ移行した後に、さらに着座者が意図して上部背フレーム61に体重を掛けると、上部背フレーム61が前記第3支軸X3を中心に下部背フレーム62に対して後傾し、シンクロロッキング状態(R)と背チルト状態(T)とを組み合わせた最後傾状態となる(図示省略)。   After the chair 1 is shifted from the normal state (S) to the back tilt state (T), when the seated person puts his / her weight on the entire backrest 7, the upper back frame 61 is rearward of the lower back frame 62. While maintaining the tilted posture, the lower back frame 62 tilts backward about the first support shaft X1. As a result, the chair 1 is in the last tilted state (not shown) that combines the back tilt state (T) and the synchro-rocking state (R). In a similar manner, after the transition from the normal state (S) to the synchro-rocking state (R), when the seater intentionally puts weight on the upper back frame 61, the upper back frame 61 is moved to the third support shaft. It tilts backward with respect to the lower back frame 62 around X3, and becomes a final tilted state combining the synchro-rocking state (R) and the back tilt state (T) (not shown).
すなわち、本実施形態に掛る椅子1は、着座者の座り方、より具体的には体重の掛け方に応じて、通常状態(S)、シンクロロッキング状態(R)、背チルト状態(T)、最後傾状態、又はこれらのうち異なる2つ状態の中間である中間状態(例えば通常状態(S)とシンクロロッキング状態(R)との中間状態や、通常状態(S)と背チルト状態(T)との中間状態:図示省略)をとるものとなる。   That is, the chair 1 according to the present embodiment has a normal state (S), a synchro-rocking state (R), a back tilt state (T), depending on how a seated person sits, more specifically, how to apply weight. The last tilted state, or an intermediate state that is intermediate between two different states (for example, an intermediate state between a normal state (S) and a synchro-rocking state (R), a normal state (S), and a back tilt state (T) Intermediate state: not shown).
なお、本実施形態の椅子1は、背支桿6と支持基部3との間に設けられ背凭れ7の傾動動作を選択的に可能にするようにした傾動制動装置Aを備えている。傾動制動装置Aは、この傾動制動装置Aの下端部を支持基部3の後端側に揺動可能に支持させ、傾動制動装置Aの上端部を下部背フレーム62の前記第4支軸X4に揺動可能に支持させたものであり、本実施形態では、傾動制動装置Aとして、図6に示すように、略円筒状のガススプリング本体A1と、このガススプリング本体A1内に略全体を収納されるべく進退するピストンロッド部(図示省略)とを具備し傾動制動部として機能する周知のガススプリングを適用しており、詳細な説明は省略する。   The chair 1 of the present embodiment includes a tilt braking device A that is provided between the back support rod 6 and the support base 3 so as to selectively allow the tilt motion of the backrest 7. The tilt braking device A supports the lower end portion of the tilt braking device A on the rear end side of the support base 3 so as to be swingable, and the upper end portion of the tilt braking device A is supported on the fourth support shaft X4 of the lower back frame 62. In this embodiment, as shown in FIG. 6, as the tilt braking device A, a substantially cylindrical gas spring main body A1 is housed, and substantially the whole is accommodated in the gas spring main body A1. A well-known gas spring having a piston rod portion (not shown) that advances and retreats as much as possible and functions as a tilt braking portion is applied, and detailed description thereof is omitted.
このように、本実施形態に係る椅子1は、背凭れ7の後傾動作に伴って座5が連動するシンクロロッキング状態(R)と、背シェル71を湾曲変形させて背凭れ7のみを後傾させる背チルト状態(T)とを採り得る椅子1になるとともに、背シェル71のうちランバーサポート部71Lより上方の部位、具体的には背シェル上部71Tを支持する上部背フレーム61と、背シェル71の下端部を支持する下部背フレーム62との枢着点(第3支軸X3)を背シェル71の下端部側における後方に設定しているため、着座者が意図して背シェル71の上部に体重を掛けた場合に、上部背フレーム61が枢着点(第3支軸X3)を中心に後傾し、これに伴って背シェル71のうち上部側が後方へ反り返り、その結果、背シェル71の上部と下部との間の領域、具体的にはランバーサポート部71Lが自ずと前方へ突出する方向に湾曲変形し、着座者に良好な腰当り感を与えることができる。しかも、背シェル71の上部に体重を掛ける程度に応じてランバーサポート部71Lの前方への突出量も変化するため、別途専用の操作部を操作することなく、着座者は自身の体重の掛け方を変更することによって好みの腰当り感が得られるランバーサポート部71Lの突出量に設定することができ、構造の簡素化を図りつつ何ら実用性を損なうことのない椅子となる。   As described above, the chair 1 according to the present embodiment has the synchro-rocking state (R) in which the seat 5 is interlocked with the backward tilting motion of the backrest 7 and the back shell 71 is curved and deformed so that only the backrest 7 is reared. In addition to the chair 1 that can be in a tilted back tilt state (T), the upper shell frame 61 that supports a portion of the back shell 71 above the lumbar support portion 71L, specifically the back shell upper portion 71T, and the back Since the pivot point (third support shaft X3) with the lower back frame 62 that supports the lower end portion of the shell 71 is set to the rear on the lower end portion side of the back shell 71, the seated person intends the back shell 71. When the weight is applied to the upper part of the upper shell frame 61, the upper back frame 61 tilts backward around the pivot point (third support shaft X3), and the upper side of the back shell 71 warps backward, and as a result, Top and bottom of the back shell 71 and Area between, specifically bent deformed in a direction in which the lumbar support portion 71L protrudes naturally forward, it is possible to provide a feeling per good waist seated person. In addition, since the amount of forward protrusion of the lumbar support portion 71L also changes depending on the degree of weight applied to the upper portion of the back shell 71, the seated person can apply his / her own weight without operating the dedicated operation portion separately. Can be set to the protruding amount of the lumbar support portion 71L that provides a desired feeling of waist contact, and the chair can be made without any loss of practicality while simplifying the structure.
特に、上部背フレーム61が、枢着点(第3支軸X3)よりもさらに下方に延出するオーバーハング部612を備えたものであり、当該オーバーハング部612と下部背フレーム62との間に、上部背フレーム61の後傾動作に伴って反力を発生する弾性体(第2コイルバネ63)を配しているため、背チルト用の反力機構をコンパクトなものとすることができ、構造の大型化及び複雑化を有効に回避できる。   In particular, the upper back frame 61 includes an overhang portion 612 that extends further downward than the pivot point (the third support shaft X3), and the upper back frame 61 is provided between the overhang portion 612 and the lower back frame 62. In addition, since the elastic body (second coil spring 63) that generates a reaction force in accordance with the backward tilting operation of the upper back frame 61 is arranged, the reaction force mechanism for the back tilt can be made compact. An increase in size and complexity of the structure can be effectively avoided.
加えて、上部背フレーム61と背シェル71のランバーサポート部71Lとの間に空間が形成されるように設定しているため、ランバーサポート部71Lが上部背フレーム61に干渉することによってランバーサポート部71Lの前方への凸変形が抑制されることを確実に防止することができる。   In addition, since it is set so that a space is formed between the upper back frame 61 and the lumbar support portion 71L of the back shell 71, the lumbar support portion 71L interferes with the upper back frame 61 to cause a lumbar support portion. It can prevent reliably that convex deformation to the front of 71L is suppressed.
上部背フレーム61が、背シェル71を高さ方向にスライド移動可能に係合させた状態で支持するものであるため、着座者が意図して背シェル71の上部に体重を掛けて、上部背フレーム61が枢着点(第3支軸X3)を中心に後傾した際に、背シェル71が上部背フレーム61に対して高さ方向にスライド移動することによって背シェル上部71Tの後方への反り返りを許容し、背シェル71全体が弓なりに撓む変形動作をスムーズに行わせることができる。   Since the upper back frame 61 supports the back shell 71 in a state in which the back shell 71 is slidably movable in the height direction, the seated person intentionally puts the weight on the upper portion of the back shell 71, and When the frame 61 tilts backward about the pivot point (third support shaft X3), the back shell 71 slides in the height direction with respect to the upper back frame 61, so that the back shell upper portion 71T moves backward. It is possible to allow warping back and smoothly perform a deformation operation in which the entire back shell 71 is bent like a bow.
また、背シェル71の左右巾方向略中央部に上部背フレーム61及び下部背フレーム62からなる一組の背支桿6を配しているため、背シェル71の両側端部が開放されたものとなり、背シェル71の捻れ変形を許容し、着座者の体重の掛け方に応じた背シェル71の3次元的な撓み変形が可能となる。なお、本実施形態では、背シェル上部71Tに複数の開口711を形成しているため、これら複数の開口711の存在が、着座者の肩付近を支持し得る背シェル上部71Tのスムーズな捻れ変形の実現に大いに寄与している。さらに付言すれば、所定領域において開口711が占める割合である開口率を、背シェル71の上縁部及び両側縁部に向かって漸次大きくなるように設定していることも背シェル上部71Tのスムーズな捻れ変形の実現に寄与している。   In addition, since a pair of back support rods 6 composed of an upper back frame 61 and a lower back frame 62 are arranged at a substantially central portion in the left-right width direction of the back shell 71, both end portions of the back shell 71 are opened. Thus, the torsional deformation of the back shell 71 is allowed, and the three-dimensional flexural deformation of the back shell 71 according to how the seated person's weight is applied becomes possible. In the present embodiment, since a plurality of openings 711 are formed in the back shell upper portion 71T, the presence of the plurality of openings 711 enables smooth twist deformation of the back shell upper portion 71T capable of supporting the vicinity of the shoulder of the seated person. Has contributed greatly to the realization of In addition, the smoothness of the upper portion of the back shell 71T is that the opening ratio, which is the ratio of the opening 711 in the predetermined region, is set to gradually increase toward the upper edge and both side edges of the back shell 71. This contributes to the realization of a torsional deformation.
背シェル71の変形特性を方向付けるために背シェル71のランバーサポート部71Lに、ランバーサポート部71Lの周辺部位よりも部分的に変形し易くした変形惹起手段713を設けているため、上部背フレーム61が枢着点(第3支軸X3)を中心に後傾した際に、背シェル71全体が湾曲変形しながらランバーサポート部71Lを確実に前方へ突出させることができる。特に、本実施形態では、背シェル71の左右巾方向に延びる複数のスリット713aによって変形惹起手段713を構成しているため、変形惹起手段713を極めて簡単な方法で実現できる。   In order to orient the deformation characteristics of the back shell 71, the lumbar support portion 71L of the back shell 71 is provided with deformation inducing means 713 that is partially deformed more easily than the peripheral portion of the lumbar support portion 71L. When 61 is tilted backward about the pivot point (third support shaft X3), the lumbar support portion 71L can be reliably projected forward while the entire back shell 71 is curved and deformed. In particular, in the present embodiment, since the deformation inducing means 713 is configured by the plurality of slits 713a extending in the left-right width direction of the back shell 71, the deformation inducing means 713 can be realized by a very simple method.
なお、本発明は、以上に詳述した実施形態に限られるものではない。   The present invention is not limited to the embodiment described in detail above.
例えば、前記実施形態では、上部背フレーム61が枢着点(第3支軸X3)から所定方向に延出するオーバーハング部612を備え、オーバーハング部612と下部背フレーム62との間に、上部背フレーム61の後傾動作に伴って反力を発生する弾性体(第2コイルバネ63)を配した態様を例示したが、これに替えて、下部背フレームを、上部背フレームとの枢着点からさらに所定方向(例えば上方)に延出するオーバーハング部を備えたものとし、当該オーバーハング部と上部背フレームとの間に、上部背フレームの後傾動作に伴って反力を発生する弾性体を配した態様としても構わない。   For example, in the above-described embodiment, the upper back frame 61 includes the overhang portion 612 that extends in a predetermined direction from the pivot point (the third support shaft X3), and between the overhang portion 612 and the lower back frame 62, Although an embodiment in which an elastic body (second coil spring 63) that generates a reaction force in accordance with the backward tilting operation of the upper back frame 61 is illustrated, the lower back frame is pivotally attached to the upper back frame instead. It is assumed that an overhang portion extending further in a predetermined direction (for example, upward) from the point is provided, and a reaction force is generated between the overhang portion and the upper back frame as the upper back frame is tilted backward. An aspect in which an elastic body is arranged may be used.
また、上部背フレームの後傾動作に伴って反力を発生する弾性体として、軸方向を椅子の左右巾方向と略一致させ、両端部を相互に軸中心から離反する方向に延出させたいわゆる巻きバネや、ゴムを適用してもよい。さらに、上部背フレーム又は下部背フレームの何れか一方のフレームに設けたオーバーハング部が、上部背フレームの後傾動作に伴ってオーバーハング部と他方のフレームとの間に介在する弾性体を反発力を蓄積する方向に引っ張るものであっても勿論構わない。   In addition, as an elastic body that generates a reaction force in accordance with the backward tilting action of the upper back frame, the axial direction is made to substantially coincide with the lateral width direction of the chair, and both ends are extended in directions away from the axial center. A so-called winding spring or rubber may be applied. Further, the overhang portion provided on either the upper back frame or the lower back frame repels the elastic body interposed between the overhang portion and the other frame in accordance with the backward tilting operation of the upper back frame. Of course, it may be pulled in the direction of accumulating force.
また、前記実施形態では、上部背フレーム61が、背シェル上部71Tを高さ方向にスライド移動可能に係合させた状態で支持する態様を例示したが、これに替えて、下部背フレームが、背シェルの下部を高さ方向にスライド移動可能に係合させた状態で支持するものであってもよく、或いは、上部背フレーム及び下部背フレームの何れもが、背シェルを高さ方向にスライド移動可能に係合させた状態で支持するものであっても構わない。すなわち、背シェルと背支桿との相対スライド移動を許容するスライド係合機構を、上部背フレームと背シェルとの間にのみ設けた態様、又は下部背フレームと背シェルとの間にのみ設けた、或いは各背フレームと背シェルとの間にそれぞれ設けた態様、これら何れの態様であっても構わない。さらに、スライド可能な距離は仕様等に応じて適宜設計変更すればよい。前記実施形態では、係合孔に係合部を係合させる態様を例示したが、係合孔に替えて係合溝を適用しても構わない。加えて、スライド係合機構として、背シェル側に係合孔又は係合溝等の係合凹部を一体に設け、背フレーム側に係合凹部にスライド係合可能な係合凸部を設けた態様を採用してもよい。その一例として、図13に示すように、背シェル71(背シェル上部)の背面に、下方にのみ開口するポケット状の係合凹部714’を一体に設ける一方、背支桿(上部背フレーム61)に、前記係合凹部714’に下方から挿入可能な側面視L字状をなす上向きの係合係合凸部611’を設け、上部背フレーム61の後傾動作に伴って、係合凸部611’と係合凹部714’との係合状態が解除されない範囲で係合凸部611’に対する係合凹部714’の呑み込み量を少なくさせることにより、背シェル71が背支桿(上部背フレーム61)に対して高さ方向にスライド移動し得るようにした態様が挙げられる。この場合、背シェルを背支桿に上方から落とし込むことによって係合凹部と係合凸部とを相互に係合させることができ、組み付け作業を簡単に行うことができる。   Moreover, in the said embodiment, although the upper back frame 61 illustrated the aspect which supports in the state which engaged the back shell upper part 71T so that sliding movement was possible in a height direction, it replaces with this and a lower back frame, The lower part of the back shell may be supported so as to be slidably movable in the height direction, or both the upper back frame and the lower back frame slide the back shell in the height direction. You may support in the state engaged so that movement was possible. That is, a mode in which a slide engagement mechanism that allows relative sliding movement between the back shell and the back support rod is provided only between the upper back frame and the back shell, or provided only between the lower back frame and the back shell. Alternatively, it may be an aspect provided between each back frame and the back shell, or any of these aspects. Furthermore, the slidable distance may be appropriately changed according to the specifications. In the said embodiment, although the aspect which engages an engaging part with an engagement hole was illustrated, it may replace with an engagement hole and may apply an engagement groove | channel. In addition, as a slide engagement mechanism, an engagement concave portion such as an engagement hole or an engagement groove is integrally provided on the back shell side, and an engagement convex portion capable of sliding engagement with the engagement concave portion is provided on the back frame side. Aspects may be adopted. As an example, as shown in FIG. 13, a pocket-shaped engaging recess 714 ′ opening only downward is integrally provided on the back surface of the back shell 71 (upper shell upper portion), while a back support rod (upper back frame 61 is provided. ) Is provided with an upward engaging engagement convex portion 611 ′ having an L shape in side view that can be inserted from below, and the engagement convex portion 714 ′ By reducing the amount of squeezing of the engagement recess 714 ′ with respect to the engagement protrusion 611 ′ within a range in which the engagement state between the portion 611 ′ and the engagement recess 714 ′ is not released, the back shell 71 can be A mode in which the frame 61) can slide in the height direction is mentioned. In this case, the engaging concave portion and the engaging convex portion can be engaged with each other by dropping the back shell into the back support rod from above, and the assembling work can be easily performed.
また、背シェルの両側縁部又は両側縁部近傍部位に、上部背フレームと下部背フレームからなる背支桿をそれぞれ配した態様としてもよい。つまり、上部背フレームと下部背フレームからなる背支桿の組を複数組(3組以上も含む)備えた椅子であっても構わない。   Moreover, it is good also as an aspect which respectively arranged the back support rod which consists of an upper back frame and a lower back frame in the both-sides edge part of a back shell, or both site | part vicinity parts. That is, the chair may be provided with a plurality of sets (including three or more sets) of back support rods composed of an upper back frame and a lower back frame.
変形惹起手段として、背シェルの左右巾方向に延びるスリットに替えて、薄肉部(薄肉ヒンジ)や、背シェルの両側縁からそれぞれ左右巾方向中央に向かって切り欠いた切欠部や、背シェルの左右巾方向に沿って等間隔又は間欠的に設けた複数の孔を適用してもよい。   As a means for inducing deformation, instead of slits extending in the lateral width direction of the back shell, thin-walled portions (thin-wall hinges), notched portions cut out from the both side edges of the back shell toward the lateral center in the lateral direction, A plurality of holes provided at equal intervals or intermittently along the left-right width direction may be applied.
また、下部背フレームが、背シェルの下端部ではなく下端部近傍部位を支持するものであっても構わない。   Further, the lower back frame may support a portion near the lower end instead of the lower end of the back shell.
その他、各部の具体的構成についても上記実施形態に限られるものではなく、本発明の趣旨を逸脱しない範囲で種々変形が可能である。   In addition, the specific configuration of each part is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
本発明の一実施形態に係る椅子を斜め前方から見た全体図。The whole figure which looked at the chair concerning one embodiment of the present invention from the slanting front. 同実施形態に係る椅子を斜め後方から見た全体図。The whole figure which looked at the chair concerning the embodiment from the slanting back. 同実施形態において通常状態にある椅子の側面図。The side view of the chair in a normal state in the embodiment. 同実施形態において通常状態にある椅子の背面図。The rear view of the chair in a normal state in the embodiment. 図3を一部省略して示す作用説明図。Action explanatory drawing which abbreviate | omits and shows a part of FIG. 図5におけるX方向矢視図。The X direction arrow line view in FIG. 図5の一部であって背シェルのみを左右巾方向中央縦断面で模式的に示す図。The figure which is a part of FIG. 5, and shows only a back shell typically in the left-right width direction center longitudinal cross-section. 図5のY領域における背シェルと背支桿との組み付け態様を模式的に示す図。The figure which shows typically the assembly | attachment aspect of the back shell and back support rod in the Y area | region of FIG. 同実施形態においてシンクロロッキング状態にある椅子を図3に対応させて示す図。The figure which shows the chair in a synchro-rocking state in the embodiment corresponding to FIG. 同実施形態においてシンクロロッキング状態にある椅子を図5に対応させて示す図。The figure which shows the chair in a synchro-rocking state in the embodiment corresponding to FIG. 同実施形態において背チルト状態にある椅子を図3に対応させて示す図。The figure which shows the chair in a back tilt state in the same embodiment corresponding to FIG. 同実施形態において背チルト状態にある椅子を図5に対応させて示す図。The figure which shows the chair in a back tilt state in the embodiment corresponding to FIG. 同実施形態におけるスライド係合機構の一変形例を図5及び図12に対応させて模式的に示す図。The figure which shows typically the modification of the slide engagement mechanism in the embodiment corresponding to FIG.5 and FIG.12.
符号の説明Explanation of symbols
1…椅子
3…支持基部
5…座
6…背支桿
61…上部背フレーム
612…オーバーハング部
62…下部背フレーム
63…弾性体(第2コイルバネ)
7…背凭れ
71…背シェル
713…変形惹起手段
713a…スリット
71L…ランバーサポート部
X3…枢着点(第3支軸)
DESCRIPTION OF SYMBOLS 1 ... Chair 3 ... Support base 5 ... Seat 6 ... Back support rod 61 ... Upper back frame 612 ... Overhang part 62 ... Lower back frame 63 ... Elastic body (2nd coil spring)
7 ... Backrest 71 ... Back shell 713 ... Deformation inducing means 713a ... Slit 71L ... Lumber support part X3 ... Pivoting point (third spindle)

Claims (7)

  1. 弾性変形可能な背シェルを主体としてなる背凭れの後傾動作に伴って、座が連動する椅子であって、
    前記座の下方に配した支持基部に下端部又は下端部近傍部位を枢支させ且つ前記背シェルを支持する背支桿が、前記背シェルのうち着座者の腰部を支持し得るランバーサポート部よりも上方の部位を支持する上部背フレームと、前記背シェルの下端部又は下端部近傍部位を支持する下部背フレームとを備え、これら背フレーム同士を相互に枢着し、当該枢着点を前記背シェルの下端部側における後方に設定したものであり、当該枢着点を中心に前記上部背フレームが前記下部背フレームに対して後傾する動作に伴って、前記背シェルが前記ランバーサポート部を相対的に前方へ突出させるように全体的に湾曲変形することを特徴とする椅子。
    A chair whose seat is interlocked with a back tilting action mainly of an elastically deformable back shell,
    From a lumbar support portion that supports a lower end portion or a portion near the lower end portion of a support base disposed below the seat and supports the back shell, and a lumbar support portion that can support a waist of a seated person in the back shell. An upper back frame that supports the upper part and a lower back frame that supports a lower end part of the back shell or a part near the lower end part, and the back frames are pivoted to each other, and the pivot point is The back shell is set at the lower end side of the back shell, and the back shell is moved toward the lower back frame around the pivot point. A chair that is curved and deformed so as to relatively protrude forward.
  2. 前記上部背フレーム又は前記下部背フレームの何れか一方の背フレームが、前記枢着点から所定方向に延出するオーバーハング部を備えたものであり、当該オーバーハング部と他方の背フレームとの間に、前記上部背フレームの後傾動作に伴って反力を発生する弾性体を配している請求項1記載の椅子。 Either the upper back frame or the lower back frame includes an overhang portion extending in a predetermined direction from the pivot point, and the overhang portion and the other back frame The chair according to claim 1, wherein an elastic body that generates a reaction force with a backward tilting motion of the upper back frame is disposed therebetween.
  3. 前記上部背フレームと前記背シェルの前記ランバーサポート部との間に空間を形成している請求項1又は2記載の椅子。 The chair according to claim 1 or 2, wherein a space is formed between the upper back frame and the lumbar support portion of the back shell.
  4. 前記上部背フレーム又は前記下部背フレームの少なくとも一方が、前記背シェルを高さ方向にスライド移動可能に係合させた状態で支持するものである請求項1、2又は3記載の椅子。 The chair according to claim 1, 2 or 3, wherein at least one of the upper back frame or the lower back frame supports the back shell in a state of being slidably engaged in a height direction.
  5. 前記背シェルの左右巾方向略中央部に前記上部背フレーム及び前記下部背フレームからなる一組の前記背支桿を配している請求項1、2、3又は4記載の椅子。 The chair according to claim 1, 2, 3, or 4, wherein a pair of the back support rods including the upper back frame and the lower back frame are arranged at a substantially central portion in the lateral width direction of the back shell.
  6. 前記背シェルの変形特性を方向付けるために前記背シェルの前記ランバーサポート部に、当該ランバーサポート部の周辺部位よりも部分的に変形し易くした変形惹起手段を設けている請求項1、2、3、4又は5記載の椅子。 In order to orient the deformation characteristics of the back shell, the lumbar support part of the back shell is provided with a deformation inducing means that makes it easier to partially deform than the peripheral part of the lumbar support part. The chair according to 3, 4 or 5.
  7. 前記変形惹起手段が、前記背シェルの左右巾方向に延びる一又は複数のスリットである請求項6記載の椅子。 The chair according to claim 6, wherein the deformation inducing means is one or a plurality of slits extending in a lateral width direction of the back shell.
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US12/734,978 US20100244521A1 (en) 2008-01-16 2008-08-05 Chair
CN200880124858.1A CN101951812B (en) 2008-01-16 2008-08-05 Chair
PCT/JP2008/064033 WO2009090770A1 (en) 2008-01-16 2008-08-05 Chair
PCT/JP2008/064032 WO2009090769A1 (en) 2008-01-16 2008-08-05 Chair
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JP5347142B2 (en) 2013-11-20
WO2009090770A1 (en) 2009-07-23
EP2233044A1 (en) 2010-09-29
WO2009090769A1 (en) 2009-07-23
JP2009165662A (en) 2009-07-30
JP5347141B2 (en) 2013-11-20
EP2233043A1 (en) 2010-09-29
EP2233043A4 (en) 2011-10-19
US20100244521A1 (en) 2010-09-30

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