JP2004141425A

JP2004141425A - Chair

Info

Publication number: JP2004141425A
Application number: JP2002310164A
Authority: JP
Inventors: Koichi Morisada; 森貞　浩一; Koichi Isoda; 磯田　浩一; Kozo Abe; 阿部　紘三
Original assignee: Itoki Crebio Corp
Current assignee: Itoki Crebio Corp
Priority date: 2002-10-24
Filing date: 2002-10-24
Publication date: 2004-05-20
Anticipated expiration: 2022-10-24
Also published as: JP4103541B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chair wherein the attaching of a backrest plate to a frame is easy, and at the same time, which is excellent in durability as well, can provide a favorable cushioning property, and in addition, is excellent in appearance as well, and for which the number of parts can be reduced. <P>SOLUTION: This chair has a seat plate 2 and the backrest plate 3 attached to the frame 1. In this case, the upper part of the backrest plate is attached to the frame, and at the same time, is provided with a gap 31 for allowing the lower part of the backrest plate to be warped and deformed in the longitudinal direction between the back surface of the lower part of the backrest plate and the frame. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、椅子に係わり、更に詳しくはフレームに座板と背凭れ板を取付けた椅子に関するものである。
【０００２】
【従来の技術】
従来から、フレームに座板と背凭れ板を取付けて構成した椅子は公知であり、フレームに座板及び背凭れ板を取付ける構造も各種提供されている。例えば、特許文献１には、逆Ｕ字状に成形した合成樹脂製の背体縁枠の内周面に、板状背体を嵌着するとともに、背体縁枠の下方両端部に丸棒を延出し、座体の後方両側に立設した両支脚の上端に前記丸棒を嵌入して、側方からねじにより抜止めした連結構造が記載されている。
【０００３】
また、特許文献２には、比較的薄いクッションを折り曲げ、その間に両側端に嵌合用の筒部を設けたキャンバスを挟み込んで取付け、略Ｕ型に形成されて背フレームに前記筒部を嵌合してクッションを被せ、かつ下部にポケットを有する袋状のカバーで被覆一体化した背凭れ部の構造が記載されている。また、座部の構造そして、両側の側フレームの前後間に固定された前フレームと背フレームとの間にキャンバスを張設し、該キャンバスに座部クッションを載置したものが記載されている。
【０００４】
また、特許文献３には、インジェクション成形した座板と背凭れ板とを、丸スチールパイプにより形成されたフレームに取付けた椅子が記載されている。つまり、略Ｕ字型の背支杆の左右立起部及び水平部に、背凭れ板の両側縁部及び上縁部に形成した嵌合部を嵌合するとともに、背凭れ板の両側縁部に形成した取付部を左右立起部の後面部を回り込んで覆うような形状とし、該取付部を後側から立起部にねじ止めした構造が記載されている。また、座板は、薄板状の椅子本体の下面に略格子状に垂下した複数の補強用リブを有し、前後方向に延びる両側の座受杆の前後間に前支持体と後支持体を連結し、その上に前記座板が支持されている。
【０００５】
【特許文献１】実用新案登録第２５９６９３３号公報
【０００６】
【特許文献２】実公昭６０−３８９１９号公報
【０００７】
【特許文献３】特開２００１−９５６４３公報
【０００８】
【発明が解決しようとする課題】
ここで、特許文献１に記載されたものは、背凭れ部の連結部分における強度に問題があるとともに、合成樹脂製の背体縁枠の撓みを利用してクッション性を持たせているので、耐久性に問題がある。また、特許文献２に記載されたものは、張設したキャンバスで座及び背クッションを支持する構造であるので、経年変化によりキャンバスが延びて座部や背凭れ部に張りがなくなり、所期の座り心地が得られなくなり、やはり耐久性に問題があるとともに、組み立てに手間がかかる。そして、特許文献３に記載されたものは、座板や背凭れ板の取付強度の点で問題があるとともに、クッション性が乏しく、更に背凭れ板の背面に背支杆が露出して外観性に劣る。
【０００９】
本発明が前述の状況に鑑み、解決しようとするところは、フレームへの背凭れ板の取付けが容易であるとともに、耐久性にも優れ、また良好なクッション性を持たせることができ、更に外観性にも優れ、部品点数を削減できる椅子を提供する点にある。
【００１０】
【課題を解決するための手段】
本発明は、前述の課題解決のために、フレームに座板と背凭れ板を取付けた椅子であって、前記背凭れ板の上部をフレームに取付けるとともに、該背凭れ板の下部背面と前記フレームとの間に、該背凭れ板の下部が前後に撓み変形することを許容するための隙間を設けてなる椅子を構成した。
【００１１】
ここで、前記背凭れ板の背面に下方へ開口した装着部を突設するとともに、前記フレームの上方へ向いた背固定部を前記背凭れ板の装着部内に嵌挿するとともに、該背固定部に設けた係合爪と装着部内に設けた係合凹部とからなる固定手段あるいは前記装着部を貫通して背固定部にねじ止めする固定手段にて抜止めして背凭れ板を取付けてなることが好ましい。
【００１２】
また、前記背凭れ板の背面に下方へ開口した袋状の装着部を突設するとともに、該装着部の開口部が背凭れ板の幅方向で両端部から中央部に向かって連続形成されており、前記フレームを構成する支持フレームは左右一対の支持杆の略垂直な背支持杆の先端部間を背連結杆で連結一体化したものであり、該背支持杆の先端部の前記背固定部を前記背凭れ板の装着部内に嵌挿するとともに、前記背連結杆を前記装着部の開口部内に位置させて背凭れ板の略中央部を支持してなるのである。
【００１３】
更に、前記座板と背凭れ板とを、同一形状となして合成樹脂製で一体成形してなることがより好ましい。
【００１４】
【発明の実施の形態】
次に本発明の実施の形態を添付図面に基づき更に詳細に説明する。図１〜図４は本発明に係る椅子を示し、図中符号１はフレーム、２は座板、３は背凭れ板、４は脚フレーム、５は支持フレームをそれぞれ示している。
【００１５】
本発明に係る椅子は、金属製フレーム１に合成樹脂製で一体成形した座板２と背凭れ板３を取付けた構造を有している。前記フレーム１は、丸スチールパイプだ作製した脚フレーム４と支持フレーム５を分離可能に連結して構成したが、材料としてはアルミ製でも良く、また中実の棒でも良く、更に断面形状も任意である。
【００１６】
また、前記座板２と背凭れ板３は、共に合成樹脂製で一体成形されたものであり、例えば発泡ポリプロピレン等で成形し、前記座板２にあっては下面に後方へ開口した袋状の装着部６を突設するとともに、該装着部６の開口部７が座板２の幅方向で両端部から中央部に向かって連続形成されており、前記背凭れ板３にあっては背面に下方へ開口した袋状の装着部８を突設するとともに、該装着部８の開口部９が背凭れ板３の幅方向で両端部から中央部に向かって連続形成されている。前記座板２と背凭れ板３は、滑らかに湾曲した板体の凸面側に、前記装着部６，８を滑らかに湾曲させて突出した形状となっており、前記開口部７，９の部分のみが不連続な段部となっている。そして、前記座板２の開口部７を、該座板２の前後方向で略中央部に形成し、前記背凭れ板３の開口部９を、該背凭れ板３の上下方向で略中央部に形成している。
【００１７】
ここで、前記座板２と背凭れ板３とは同一金型で成形した同一形状とすることがコスト削減の観点から好ましい。但し、前記座板２と背凭れ板３とを同一形状に成形しても、穿孔等の後加工を加えることはある。また、前記座板２と背凭れ板３は、成形品であるので、素材や発泡倍率を変えることによって弾性力を適宜設定することが可能であり、また着色も自由であるので、様々な色のものを提供できる。
【００１８】
そして、前記フレーム１の前方へ向いた座固定部１０を前記座板２の装着部６内に嵌挿した状態で該座板２をフレーム１に取付けるとともに、前記フレーム１の上方へ向いた背固定部１１を前記背凭れ板３の装着部８内に嵌挿した状態で該背凭れ板３をフレーム１に取付けるのである。
【００１９】
更に詳しくは、前記フレーム１を構成する脚フレーム４は、左右一対の側面視倒コ字形の支脚杆１２，１２の上端部前後に、前受杆１３と後受杆１４を横方向に固着して設けたものである。ここで、前記脚フレーム４は、上下にスタッキングできるような形状に形成することが好ましい。また、前記フレーム１を構成する前記支持フレーム５は、略水平な座支持杆１５と、略垂直な背支持杆１６とを有する側面視略Ｌ字形の左右一対の支持杆１７，１７の両端部を、座連結杆１８と背連結杆１９で連結一体化したものであり、前記座支持杆１５，１５及び座連結杆１８とで前記座固定部１０を構成し、前記背支持杆１６，１６及び背連結杆１９とで前記背固定部１１を構成している。
【００２０】
そして、図４及び図５に示すように、前記支持フレーム５の両支持杆１７，１７の座支持杆１５，１５を前記脚フレーム４の前記後受杆１４との交差部でねじ２０，２０にて連結する。ここで、前記座支持杆１５，１５と前受杆１３及び後受杆１４との交差部であって、前記前受杆１３及び後受杆１４には取付孔２１，…を形成し、前記座支持杆１５には螺孔２２若しくはねじ２０がタッピンねじの場合には下穴を形成している。それから、図５及び図６に示すように、前記座支持杆１５，１５の先端部の前記座固定部１０を前記座板２の装着部６内に嵌挿した状態で、該装着部６を形成する袋板６Ａを前記前受杆１３と座固定部１０とで挟み、袋板６Ａを貫通して前記前受杆１３と座固定部１０とを連結する。ここで、前記座連結杆１８を前記装着部６の開口部７内に位置させて座板２の略中央部を支持している。この場合、前記座板２の袋板６Ａには通孔２３，２３を形成しておき、前記前受杆１３の取付孔２１，２１に下方から挿入したねじ２４を通孔２３，２３を通して前記座固定部１０である座支持杆１５，１５に形成した螺孔２２，２２に螺合して連結する。従って、前記ねじ２０，２０及びねじ２４，２４を外せば、前記座板２と脚フレーム４と支持フレーム５とは完全に分解することができる。
【００２１】
また、前記背凭れ板３をフレーム１に取付けるには、図３、図４及び図７に示すように、前記支持フレーム５の略垂直な背支持杆１６の先端部の前記背固定部１１を前記背凭れ板３の装着部８内に嵌挿するとともに、適宜な固定手段にて抜止めして取付ける。ここで、前記背固定部１１を前記背凭れ板３の装着部８内に嵌挿した状態で、前記背連結杆１９を前記装着部８の開口部９内に位置させて背凭れ板３の略中央部を支持している。
【００２２】
前記固定手段としては、前記装着部８を形成する袋板８Ａで、前記座板２の通孔２３，２３と同じ位置に形成した通孔２５，２５にねじ２６，２６を挿通し、前記背支持杆１６，１６の先端部に形成した螺孔２７又は前記ねじ２６がタッピンねじの場合には下穴に螺合して抜止めする。この場合、前記座板２と背凭れ板３とは、前記通孔２３，２３と通孔２５，２５のまで同一となり、これら通孔を含めて一体成形することが可能である。また、前記背凭れ板３と支持フレーム５との分解もねじ２６，２６を外すだけで簡単に行うことができ、廃棄処分の際の分別、リサイクルが容易である。
【００２３】
また、他の固定手段としては、図８及び図９に示すように、前記背固定部１１を構成する前記背支持杆１６，１６の先端部に設けた係合爪２８，２８と前記装着部８内に設けた係合凹部２９，２９とからなる固定手段を採用することが可能である。この場合には、単に前記背固定部１１を背凭れ板３の装着部８内に嵌挿するだけで、前記係合爪２８，２８が係合凹部２９，２９に係合して抜止め状態で簡単に取付けることができる。また、前記背凭れ板３と支持フレーム５との分解は、前記背支持杆１６，１６の先端部に沿って前記装着部８の袋板８Ａを切開することで容易に行える。
【００２４】
このように、前記座板２と背凭れ板３とを前記フレーム１に取付けて組み立てた椅子は、前記座板２と背凭れ板３が合成樹脂製であるので材料そのものの弾性力を備えているが、図５に示すように、前記座板２の開口部７より後方側の下面と、前記支持フレーム５の座支持杆１５との間に、該座板２の後部が上下に撓み変形することを許容するための隙間３０を設け、また図７及び図９に示すように、前記背凭れ板３の開口部９より下方側の背面と、前記支持フレーム５の背支持杆１６との間に、該背凭れ板３の下部が前後に撓み変形することを許容するための隙間３１を設けている。
【００２５】
従って、前記座板２に着座すると、着座者の重心が座板２の前後中央部よりも後方に位置するので、前記座板２の後部が前記隙間３０を設けた作用によって下方へ撓み変形するとともに、前記背凭れ板３に凭れ掛かった際に、着座者の腰部の押圧力で前記背凭れ板３の下部が前記隙間３１を設けた作用によって後方へ撓み変形する。それにより、着座者の体重、体型に応じて座板２及び背凭れ板３が部分的に変形するので、座り心地が非常に良くなる。
【００２６】
【発明の効果】
以上にしてなる請求項１に係る発明の椅子は、フレームに座板と背凭れ板を取付けた椅子であって、前記背凭れ板の上部をフレームに取付けるとともに、該背凭れ板の下部背面と前記フレームとの間に、該背凭れ板の下部が前後に撓み変形することを許容するための隙間を設けてなるので、背凭れ板に凭れ掛かった際に、着座者の腰部の押圧力で前記背凭れ板の下部が後方へ撓み変形するので、良好なクッション性を持たせることができ、座り心地が良くなる。
【００２７】
請求項２によれば、フレームへの背凭れ板の取付けが容易になり、また外観性にも優れたものとなる。
【００２８】
請求項３によれば、フレームに背凭れ板を簡単に取付けることができるにも係らず、背凭れ板の取付強度が高く、しかも背連結杆で背凭れ板の上下略中央部を支持するので、支持強度が高く、耐久性も向上し、更に組立工数と部品点数を削減できてコスト低減化に大きく寄与する。
【００２９】
請求項４によれば、座板及び背凭れ板の形状、色も自由に設計することができ、斬新なデザインの椅子を提供でき、更に座板と背凭れ板を共通部品化して更なるコスト低減化図ることができる。
【図面の簡単な説明】
【図１】本発明に係る椅子の斜視図である。
【図２】同じく椅子の側面図である。
【図３】同じく座板と背凭れ板の取付部の構造を示した側面図である。
【図４】本発明の椅子の分解斜視図である。
【図５】フレームに座板を取付けた状態の部分縦断側面図である。
【図６】同じくフレームに座板を取付けた状態の部分縦断正面図である。
【図７】支持フレームに背凭れ板を取付けた状態の部分縦断側面図である。
【図８】支持フレームに背凭れ板を抜止め状態で取付ける構造を示す部分分解斜視図である。
【図９】同じく支持フレームに背凭れ板を抜止め状態で取付けた状態の部分縦断側面図である。
【符号の説明】
１　フレーム　　　　　２　座板
３　背凭れ板　　　　　４　脚フレーム
５　支持フレーム　　　６　装着部
６Ａ　袋板　　　　　　７　開口部
８　装着部　　　　　　８Ａ　袋板
９　開口部　　　　　　１０　座固定部
１１　背固定部　　　　１２　支脚杆
１３　前受杆　　　　　１４　後受杆
１５　座支持杆　　　　１６　背支持杆
１７　支持杆　　　　　１８　座連結杆
１９　背連結杆　　　　２０　ねじ
２１　取付孔　　　　　２２　螺孔
２３　通孔　　　　　　２４　ねじ
２５　通孔　　　　　　２６　ねじ
２７　螺孔　　　　　　２８　係合爪
２９　係合凹部　　　　３０　隙間
３１　隙間[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a chair, and more particularly to a chair having a seat and a backrest attached to a frame.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, chairs configured by attaching a seat plate and a backrest plate to a frame are known, and various structures for attaching the seat plate and the backrest plate to the frame have been provided. For example, in Patent Literature 1, a plate-shaped back body is fitted to the inner peripheral surface of a synthetic resin back body frame formed into an inverted U shape, and round bars are attached to both lower ends of the back body frame. And a connecting structure in which the round bar is fitted into the upper ends of both supporting legs erected on both rear sides of the seat body and is prevented from being removed from the side by screws.
[0003]
Further, in Patent Document 2, a relatively thin cushion is bent, and a canvas provided with fitting cylinders at both ends is sandwiched and attached between the cushions. The canvas is formed into a substantially U-shape, and the cylinder is fitted to a back frame. It describes a structure of a backrest portion which is covered and integrated with a bag-shaped cover having a pocket at the lower portion. Also described is a structure of a seat portion, in which a canvas is stretched between a front frame and a back frame fixed between front and rear sides of both side frames, and a seat cushion is placed on the canvas. .
[0004]
Patent Literature 3 discloses a chair in which an injection-molded seat plate and a backrest plate are attached to a frame formed by a round steel pipe. That is, the fitting portions formed on the both side edges and the upper edge of the backrest plate are fitted into the left and right upright portions and the horizontal portion of the substantially U-shaped back support rod, and both side edges of the backrest plate. A structure is described in which the mounting portion formed in the above-mentioned configuration is formed so as to wrap around the rear surface portion of the left and right upright portion and cover the same, and the mounting portion is screwed to the upright portion from the rear side. Further, the seat plate has a plurality of reinforcing ribs suspended in a substantially lattice shape on the lower surface of the thin plate-shaped chair main body, and the front support member and the rear support member are provided between the front and rear seat receiving rods extending in the front-rear direction. And the seat plate is supported thereon.
[0005]
[Patent Document 1] Japanese Utility Model Registration No. 2596933
[Patent Document 2] Japanese Utility Model Publication No. 60-38919
[Patent Document 3] Japanese Patent Application Laid-Open No. 2001-95743
[Problems to be solved by the invention]
Here, the one described in Patent Literature 1 has a problem in strength at a connecting portion of the backrest portion, and has a cushioning property by utilizing the bending of a synthetic resin back frame. There is a problem with durability. Further, since the structure described in Patent Document 2 has a structure in which the seat and the back cushion are supported by the stretched canvas, the canvas extends due to aging, and the seat portion and the backrest portion are not stretched. You will not be able to sit comfortably, and there will be problems with durability, and it will take time to assemble. The one described in Patent Literature 3 has a problem in the mounting strength of the seat plate and the backrest plate, has poor cushioning properties, and further has a back support rod exposed on the back surface of the backrest plate to improve appearance. Inferior.
[0009]
In view of the above situation, the present invention is intended to solve the problem that the backrest plate can be easily attached to the frame, has excellent durability, and has good cushioning properties. Another object of the present invention is to provide a chair which has excellent performance and can reduce the number of parts.
[0010]
[Means for Solving the Problems]
The present invention provides a chair in which a seat plate and a backrest plate are attached to a frame, in which an upper portion of the backrest plate is attached to a frame, and a lower back surface of the backrest plate and the frame. A chair is provided with a gap between the upper and lower parts to allow the lower part of the backrest plate to be bent back and forth.
[0011]
At this time, a mounting portion that opens downward is protrudingly provided on the back surface of the backrest plate, and a back fixing portion facing upward of the frame is inserted into the mounting portion of the backrest plate, and the back fixing portion is inserted. The backrest plate is secured by pulling it out with fixing means consisting of an engaging claw provided on the mounting portion and an engaging concave portion provided in the mounting portion, or fixing means for penetrating the mounting portion and screwing to the back fixing portion. Is preferred.
[0012]
In addition, a bag-shaped mounting portion that opens downward is protrudingly provided on the back surface of the backrest plate, and the openings of the mounting portion are formed continuously from both ends to the center in the width direction of the backrest plate. The support frame constituting the frame is formed by connecting and integrating a distal end of a substantially vertical back support rod of a pair of left and right support rods with a back connection rod, and fixing the distal end of the back support rod to the back. The portion is fitted into the mounting portion of the backrest plate, and the back connecting rod is positioned in the opening of the mounting portion to support a substantially central portion of the backrest plate.
[0013]
Further, it is more preferable that the seat plate and the backrest plate have the same shape and are integrally formed of synthetic resin.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. 1 to 4 show a chair according to the present invention, wherein reference numeral 1 denotes a frame, 2 denotes a seat plate, 3 denotes a backrest plate, 4 denotes a leg frame, and 5 denotes a support frame.
[0015]
The chair according to the present invention has a structure in which a seat plate 2 and a backrest plate 3 integrally formed of a synthetic resin are attached to a metal frame 1. The frame 1 is constructed by connecting a leg frame 4 made of a round steel pipe and a support frame 5 so as to be separable, but may be made of aluminum or a solid rod, and may have an arbitrary cross-sectional shape. It is.
[0016]
The seat plate 2 and the backrest plate 3 are both made of synthetic resin and are integrally formed. For example, the seat plate 2 and the backrest plate 3 are formed of foamed polypropylene or the like. The mounting portion 6 is formed in a projecting manner, and the opening 7 of the mounting portion 6 is formed continuously from both ends to the center in the width direction of the seat plate 2. In addition, a bag-shaped mounting portion 8 which is opened downward is projected, and an opening 9 of the mounting portion 8 is formed continuously from both ends to the center in the width direction of the backrest plate 3. The seat plate 2 and the backrest plate 3 have a shape in which the mounting portions 6 and 8 are smoothly curved and protrude from the convex surface side of the smoothly curved plate body, and the portions of the openings 7 and 9 are formed. Only a discontinuous step is formed. The opening 7 of the seat plate 2 is formed substantially at the center in the front-rear direction of the seat plate 2, and the opening 9 of the backrest plate 3 is formed substantially at the center in the vertical direction of the backrest plate 3. Is formed.
[0017]
Here, it is preferable that the seat plate 2 and the backrest plate 3 have the same shape formed by the same mold from the viewpoint of cost reduction. However, even if the seat plate 2 and the backrest plate 3 are formed in the same shape, post-processing such as perforation may be added. Further, since the seat plate 2 and the backrest plate 3 are molded products, the elastic force can be appropriately set by changing the material and the expansion ratio, and the coloring can be freely performed. Can be provided.
[0018]
Then, the seat plate 2 is attached to the frame 1 with the seat fixing portion 10 facing forward of the frame 1 inserted into the mounting portion 6 of the seat plate 2, and the back facing upward of the frame 1 is mounted. The backrest plate 3 is attached to the frame 1 in a state where the fixing portion 11 is inserted into the mounting portion 8 of the backrest plate 3.
[0019]
More specifically, the leg frame 4 constituting the frame 1 has a front support rod 13 and a rear support rod 14 fixed laterally around the upper and lower ends of a pair of left and right support legs 12, 12 each having an inverted U-shape in side view. It is provided. Here, it is preferable that the leg frame 4 is formed in a shape that can be vertically stacked. The support frame 5 constituting the frame 1 has a pair of left and right support rods 17 having a substantially horizontal seat support rod 15 and a substantially vertical back support rod 16 and having a substantially L-shape in side view. Are connected and integrated by a seat connecting rod 18 and a back connecting rod 19, and the seat fixing portion 10 is constituted by the seat supporting rods 15, 15 and the seat connecting rod 18, and the back supporting rods 16, 16 are formed. And the back connecting rod 19 constitutes the back fixing portion 11.
[0020]
As shown in FIGS. 4 and 5, the seat support rods 15, 15 of both support rods 17, 17 of the support frame 5 are screwed at the intersection of the leg frame 4 with the rear receiving rod 14. Connect with. Here, mounting holes 21,... Are formed at the intersections of the seat supporting rods 15, 15 with the front receiving rod 13 and the rear receiving rod 14, and the front receiving rod 13 and the rear receiving rod 14 are formed. When the screw hole 22 or the screw 20 is a tapping screw, the seat support rod 15 has a prepared hole. Then, as shown in FIGS. 5 and 6, with the seat fixing portion 10 at the distal end of the seat support rods 15, 15 inserted into the mounting portion 6 of the seat plate 2, the mounting portion 6 is The bag plate 6A to be formed is sandwiched between the front receiving rod 13 and the seat fixing portion 10, and the front receiving rod 13 and the seat fixing portion 10 are connected through the bag plate 6A. Here, the seat connecting rod 18 is positioned in the opening 7 of the mounting portion 6 to support a substantially central portion of the seat plate 2. In this case, through holes 23, 23 are formed in the bag plate 6A of the seat plate 2, and the screws 24 inserted from below into the mounting holes 21, 21 of the front receiving rod 13 pass through the through holes 23, 23. It is screwed and connected to screw holes 22, 22 formed in the seat support rods 15, 15 which are the seat fixing portions 10. Therefore, if the screws 20, 20 and the screws 24, 24 are removed, the seat plate 2, the leg frame 4, and the support frame 5 can be completely disassembled.
[0021]
In order to attach the backrest plate 3 to the frame 1, as shown in FIGS. 3, 4 and 7, the back fixing portion 11 at the distal end of a substantially vertical back support rod 16 of the support frame 5 is used. It is inserted into the mounting portion 8 of the backrest plate 3 and is secured by a proper fixing means so as to be secured. Here, in a state where the back fixing portion 11 is inserted into the mounting portion 8 of the backrest plate 3, the back connecting rod 19 is positioned in the opening 9 of the mounting portion 8, and the backrest plate 3 is It supports almost the center.
[0022]
As the fixing means, screws 26, 26 are inserted into through holes 25, 25 formed at the same positions as the through holes 23, 23 of the seat plate 2 in the bag plate 8A forming the mounting portion 8, and When the screw hole 27 or the screw 26 formed at the tip of the support rod 16, 16 is a self-tapping screw, it is screwed into a pilot hole to prevent it from being removed. In this case, the seat plate 2 and the backrest plate 3 are the same up to the through holes 23, 23 and the through holes 25, 25, and can be integrally formed including these through holes. Further, the backrest plate 3 and the support frame 5 can be easily disassembled simply by removing the screws 26, 26, and separation and recycling at the time of disposal are easy.
[0023]
As another fixing means, as shown in FIGS. 8 and 9, engaging claws 28, 28 provided at the distal end of the back support rods 16, 16 constituting the back fixing part 11, and the mounting part It is possible to employ a fixing means composed of the engaging recesses 29 provided in the inside 8. In this case, simply by inserting the back fixing portion 11 into the mounting portion 8 of the backrest plate 3, the engaging claws 28, 28 are engaged with the engaging recesses 29, 29 to prevent the backrest. And can be easily installed. In addition, the backrest plate 3 and the support frame 5 can be easily disassembled by cutting the bag plate 8A of the mounting portion 8 along the distal ends of the back support rods 16,16.
[0024]
In this manner, the chair in which the seat plate 2 and the backrest plate 3 are attached to the frame 1 and assembled has the elastic force of the material itself because the seat plate 2 and the backrest plate 3 are made of synthetic resin. However, as shown in FIG. 5, the rear portion of the seat plate 2 is vertically deformed between the lower surface of the seat plate 2 behind the opening 7 and the seat support rod 15 of the support frame 5. 7 and FIG. 9, the back support plate 3 has a back surface below the opening 9 and a back support rod 16 of the support frame 5 as shown in FIGS. 7 and 9. A gap 31 is provided therebetween to allow the lower portion of the backrest plate 3 to be bent and deformed back and forth.
[0025]
Accordingly, when the user sits on the seat plate 2, the center of gravity of the seated person is located rearward of the front and rear center portion of the seat plate 2, so that the rear portion of the seat plate 2 is bent and deformed downward by the action of providing the gap 30. At the same time, when leaning against the backrest plate 3, the lower part of the backrest plate 3 is bent and deformed rearward by the action of providing the gap 31 by the pressing force of the waist of the seated person. Thereby, the seat plate 2 and the backrest plate 3 are partially deformed according to the weight and the body shape of the seated person, so that the sitting comfort is greatly improved.
[0026]
【The invention's effect】
The chair of the invention according to claim 1 configured as described above is a chair in which a seat plate and a backrest plate are attached to a frame, and an upper portion of the backrest plate is attached to the frame, and a lower back surface of the backrest plate is attached to the frame. Since a gap is provided between the frame and the frame so as to allow the lower portion of the backrest plate to bend and deform back and forth, when leaning on the backrest plate, the pressing force of the lumbar portion of the seated person is used. Since the lower part of the backrest plate is flexed and deformed rearward, good cushioning properties can be provided, and sitting comfort is improved.
[0027]
According to the second aspect, the attachment of the backrest plate to the frame is facilitated, and the appearance is also excellent.
[0028]
According to the third aspect, although the backrest plate can be easily attached to the frame, the mounting strength of the backrest plate is high, and the back connection rod supports the upper and lower substantially central portions of the backrest plate. In addition, the support strength is high, the durability is improved, and the number of assembly steps and the number of parts can be reduced.
[0029]
According to the fourth aspect, the shapes and colors of the seat plate and the backrest plate can be freely designed, and a chair with a novel design can be provided. Reduction can be achieved.
[Brief description of the drawings]
FIG. 1 is a perspective view of a chair according to the present invention.
FIG. 2 is a side view of the chair.
FIG. 3 is a side view showing a structure of a mounting portion of the seat plate and the backrest plate.
FIG. 4 is an exploded perspective view of the chair of the present invention.
FIG. 5 is a partial vertical sectional side view in a state where a seat plate is attached to a frame.
FIG. 6 is a partial longitudinal sectional front view showing a state in which a seat plate is attached to the frame.
FIG. 7 is a partial vertical sectional side view in a state where a backrest plate is attached to a support frame.
FIG. 8 is a partially exploded perspective view showing a structure in which a backrest plate is attached to a support frame in a retaining state.
FIG. 9 is a partial longitudinal sectional side view showing a state in which a backrest plate is attached to the support frame in a retaining state.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 frame 2 seat plate 3 backrest plate 4 leg frame 5 support frame 6 mounting portion 6A bag plate 7 opening 8 mounting portion 8A bag plate 9 opening 10 seat fixing portion 11 back fixing portion 12 supporting leg rod 13 front receiving rod 14 rear Receiving rod 15 Seat support rod 16 Back support rod 17 Support rod 18 Seat connection rod 19 Back connection rod 20 Screw 21 Mounting hole 22 Screw hole 23 Through hole 24 Screw 25 Through hole 26 Screw 27 Screw hole 28 Engaging claw 29 Engaging recess 30 gap 31 gap

Claims

A chair in which a seat plate and a backrest plate are attached to a frame, wherein an upper portion of the backrest plate is attached to the frame, and a lower portion of the backrest plate is provided between a lower back surface of the backrest plate and the frame. A chair provided with a gap for allowing bending and deformation in a front and rear direction.

A mounting portion that opens downward on the back of the backrest plate protrudes, and a back fixing portion facing upward of the frame is inserted into the mounting portion of the backrest plate, and provided on the back fixing portion. 2. A backrest plate which is secured to a backrest plate by a fixing means comprising an engaging claw and an engaging recess provided in the mounting portion or by a fixing means which passes through the mounting portion and is screwed to the back fixing portion. The described chair.

A bag-shaped mounting portion that opens downward on the back surface of the backrest plate is protruded, and the openings of the mounting portion are formed continuously from both ends to the center in the width direction of the backrest plate, The support frame constituting the frame is formed by connecting and integrating a distal end portion of a substantially vertical back support rod of a pair of left and right support rods with a back connection rod, and the back fixing portion at the distal end portion of the back support rod. 3. The chair according to claim 1, wherein the backrest plate is fitted into the mounting portion of the backrest plate, and the back connecting rod is positioned in an opening of the mounting portion to support a substantially central portion of the backrest plate.

The chair according to any one of claims 1 to 3, wherein the seat plate and the backrest plate have the same shape and are integrally formed of synthetic resin.