JP4108322B2

JP4108322B2 - Joint structure and method and chair using the same

Info

Publication number: JP4108322B2
Application number: JP2001367188A
Authority: JP
Inventors: 和幸伊藤
Original assignee: Takano Co Ltd
Current assignee: Takano Co Ltd
Priority date: 2001-11-30
Filing date: 2001-11-30
Publication date: 2008-06-25
Anticipated expiration: 2021-11-30
Also published as: JP2003166510A

Description

【０００１】
【発明の属する技術分野】
本発明は少なくとも一方の部材が樹脂成形品である２部材（パーツ）を連結するジョイント構造並びに方法及びそれを利用した椅子に関する。更に詳述すると、本発明は、外観に取り付けた痕跡を残さないジョイント構造並びに方法及びそれを利用した椅子に関する。
【０００２】
【従来の技術】
少なくとも一方の部材が樹脂成形品である２部材（パーツ）を連結する際に、外観に取り付けた痕跡を残さないジョイント構造が望まれる。例えば、図１０に示すようなカンチレバータイプのパイプ脚椅子においては、脚パイプ１０１と腰掛け部（座と背が一体化されたもの）１０２との連結が、図９に示すようなジョイント構造を備えるジョイント１０３を介して行われている。
【０００３】
このジョイント構造は、腰掛け部１０２にビス止めされる樹脂製ジョイント１０３の上端、即ち肘掛け部を構成するパイプ１０４と対向する部分にパイプ１０４に向けて突き出る筒状の突起からなる差込み部１０５を一体成形により設け、この差込み部１０５をパイプ１０４に嵌合させることによって外から見えない連結構造を実現するようにしたものである。即ち、樹脂製ジョイント１０３側には筒状の差込み部１０５を一体成形すると共に径方向に開けられたねじ孔１０６を設け、差込み部１０５をパイプ１０４に挿入した状態でパイプ１０４側に設けられた孔１０７からねじ１０８をねじ込んで固定するようにしている。また、ジョイント１０３とパイプ１０４との空回りを防ぐため、ジョイント１０３の差込み部１０５の根元部分には突起から成る回り止め部１０９が一体成形されると共に、パイプ１０４の先端面にはジョイント１０３側の回り止め部１０９と嵌合する凹部１１０が設けられている。更に、差込み部１０５の根元部分には、差込み部１０５を囲いこの差込み部１０５との間の隙間に肘掛けパッド１１２の端を嵌め込んで端部を覆って見栄えを良くする肘掛け押さえ部１１１を設けている。
【０００４】
ここで、樹脂だけで差込み部１０５を形成したのでは、差込み部１０５の根元部分にかかる剪断力で折れてしまう虞がある。そこで、差込み部１０５の剪断を防ぐために、射出成形によりジョイント１０３を成型した直後に差込み部にノックピン１１３が打ち込まれて差込み部１０５の補強が行われている。そして、この差込み部１０５には嵌め込んだパイプ１０４を固定するねじ１０８を止め着けるためのねじ孔１０６も後加工で設けられる。このねじ孔１０６は、樹脂製の差込み部１０５並びに金属製ノックピン１１３を径方向に貫通するようにねじ立てが行われることによって開けられている。
【０００５】
また、背と座のシェルが分離されたような形態をとる椅子のような場合には、シェル材としては、ガラス繊維で補強された強化樹脂を使用せざるを得ない。ガラス繊維で樹脂を強化することにより、例えば背シェルが全体的には１枚の板状に形成されている場合には、構造的強度を確保することができる。
【０００６】
【発明が解決しようとする課題】
しかしながら、差込み部１０５に金属製ノックピン１１３が圧入されているため、ノックピン１１３と差込み部１０５（惹いては樹脂製ジョイント１０３）とが分離できないので、分別廃棄処分やリサイクルが難しい。
【０００７】
また、ノックピン１１３の打ち込みやねじ切りなどの後加工が必要となり、手間がかかると共に加工コストが高くなる。しかも、金属製ノックピン１１３と比較的柔らかい樹脂製差込み部１０５との異種材料を貫通するようにねじ孔１０６を開ける加工は孔位置がずれ易く、組み立てやねじの締め付けに手間取ったり、ねじが効かなくなる虞がある。
【０００８】
更に、ノックピン１１３だけで連結部にかかる剪断力を持たせるには、樹脂の嵌合代が少ないため、より大きな剛性と強度が望まれる場合には向かない構造である。
【０００９】
また、樹脂成形品としてガラス繊維入り強化樹脂を使用するときには、樹脂成形品を粉砕したときにガラス繊維が寸断されるためガラス繊維強化プラスチックとしての再生はできないし、寸断されたガラス繊維が樹脂成型器のスクリューを傷つけるため通常の再生樹脂の材料としても使えない。このため、リサイクルが難しいものであった
【００１０】
本発明は、外観に取付けの痕跡を残さずに連結可能とするジョイント構造並びに方法において、簡単に樹脂部品と金属部品を分離できるようにすることを目的とする。また、本発明は、剪断力をジョイント部材だけで担うことができるジョイント方法及び構造を提供することを目的とする。更に、本発明は、ガラス繊維強化樹脂などの強い樹脂を使わなくとも、樹脂単独素材のパーツを使用可能とするジョイント構造の椅子を提供することを目的とする。
【００１１】
【課題を解決するための手段】
かかる目的を達成するため、請求項１記載の発明にかかるジョイント方法は、樹脂成形品とこれに連結される連結相手部材との２部材を連結するジョイント方法において、樹脂成形品に連結相手部材側に向けて突出するダボとその周りを覆う鞘部とを一体成形し、鞘部に挿入されると共にダボと嵌合する筒状の第１取付部と連結相手部材に取り付けられる第２取付部とを有する金属製ジョイント部材をダボに固定し、鞘部内に連結相手部材の先端を挿入した状態で金属製ジョイント部材の第２取付部に連結相手部材を固定して樹脂成形品と連結相手部材とを連結するようにしている。
【００１２】
このようなジョイント方法は、例えば請求項２記載のジョイント構造によって実現される。即ち、請求項２記載の発明にかかるジョイント構造は、樹脂成形品とこれに連結される連結相手部材との２部材を連結するジョイント構造において、樹脂成形品と一体成形される連結相手部材側に突出するダボ及びその周りを覆う鞘部と、鞘部に挿入されると共にダボと嵌合する筒状の第１取付部と連結相手部材に取り付けられる第２取付部並びにダボの先端面と当接する座部とを有する金属製ジョイント部材と、ジョイント部材の座部を貫通してダボにねじ込まれジョイント部材をダボに固定する取付ねじとを備え、ダボにねじ止めされた金属製ジョイント部材の第２取付部に樹脂成形品の鞘部に先端が挿入された連結相手部材を取付け、樹脂成形品と連結相手部材とを連結するようにしている。
【００１３】
このようなジョイント方法並びにジョイント構造によると、金属製ジョイント部材の第１取付部を樹脂成形品のダボに嵌合してから固定すれば、その後ジョイント部材の第２取付部に連結相手部材を止め着けることで容易にジョイント部材の取付けができ取付作業の効率が良い。また、ジョイント部材と樹脂成形品との連結箇所が鞘部に隠れると共に、鞘部の外でのジョイント部材と連結相手部材との取り付けは連結相手部材例えばパイプの裏の隠れた部分においてねじなどを利用して行われるので、取付の形跡を目に付きやすい部分の外観に残さない。しかも、連結相手部材は金属製ジョイント部材と鞘部、更にジョイント部材はダボとその周りを覆う鞘部によってそれぞれ共持ちされるので、十分な剛性と強度を確保できる。更に、本発明のジョイント方法によると、ダボに固定した金属製ジョイントを取り外すだけで、樹脂成形品と金属製ジョイント部材とが分離できるので、分別廃棄や樹脂成形品のリサイクルを可能とする。特に、本発明のジョイント構造の場合には、取付ねじでジョイント部材をダボに固定しているので、これを緩めるだけで、樹脂成形品と金属製ジョイント部材とが容易に分離でき、分別廃棄や樹脂成形品のリサイクルに効果的である。
【００１４】
また、請求項３記載の発明は、請求項２記載のジョイント構造において、取付ねじをタッピンねじとし、ダボにねじ立てするようにしている。この場合、樹脂成形品を成形する際にナット等の雌ねじ部材をインサートしたり、ねじ孔を後加工する必要がなくなる。
【００１５】
また、請求項４記載の発明は、請求項２または３記載のジョイント構造において、ジョイント部材の第１取付部の先端面とダボの根元部分の周辺に、互いに嵌合して回り止めとなる凸部と凹部とがそれぞれ設けられるようにしている。この場合には、ジョイント部材をダボに嵌め込みながら回転させるだけで回り止め部に対応する位置で自然に係合するので、位置決めが容易である。加えて、ジョイント部材とダボとの位置関係が一義的に定まるので、ジョイント部材と連結相手部材との関係も一義的に定まる。しかも、ジョイント部材は金属製でかつ単一素材であるため、ねじ孔などを開ける場合にも位置ずれが起き難い。したがって、ジョイント部材と連結相手部材との間の固定例えばビス止めなども、ねじ孔位置がずれることが少なく、組み立てやねじの締め付けに手間取ったり、ねじが効かなくなる虞も少ない。
【００１６】
更に、請求項５記載の発明にかかる椅子は、請求項２から４のいずれかに記載のジョイント構造を用いて樹脂製背シェルとそれに結合するフレームとを連結するようにしている。ここで、樹脂製背シェルに結合するフレームとしては、特に限定されるものではないが、回転椅子や固定椅子の脚パイプから延びる背支桿であったり、座を支持するフレームの一部であったりする。この場合には、樹脂製背シェルのダボに金属製ジョイント部材を嵌合させて取付ねじで固定してから、背支桿などのパイプ状構造物ないしその他の構造物を金属製ジョイントの第２取付部に嵌め込んだりあるいは重ねたりして見え易い外観に表れる箇所の裏側からあるいはカバーなどで隠せる箇所から固定するだけで、フレームと背シェルとの取付け箇所に取付の痕跡を残さずに組み立てることができる。更に、請求項６記載の発明にかかる椅子は、フレームが肘掛け部分を構成するパイプであることを特徴としている。この場合には、樹脂製背シェルのダボに金属製ジョイント部材を嵌合させて取付ねじで固定してから、脚フレームの肘掛け部のパイプを金属製ジョイントの第２取付部に嵌め込んでビスなどでパイプの裏側から固定するだけで、脚フレームの肘掛け部と背シェルとの組み立て作業が完了すると共に取付の形跡を外観に残さないようにできる。
【００１７】
また、請求項７記載の発明は、請求項６記載の椅子において、フレームが１本のパイプを折り曲げることによって、床面に当たるコの字形の脚支え部と、該脚支え部の前端から立ち上がる２本の脚部と、各脚部の上端から後方に折り曲げられ背シェルと連結される肘掛け部と、左右の脚部の座の高さの部分で後方へ向けて延びると共に少なくとも後端で幅方向に横板で連結された座用支持パイプとを備えるカンチレバー式フレームであり、かつ背シェルが非強化樹脂によってフレームの肘掛け部とそれぞれ連結される鞘部と立て壁部とボトム部とを含むバケット形状を成し、背シェルの鞘部とフレームの肘掛け部との間を請求項２から４のいずれかに記載のジョイント構造を用いて接続すると共に、ボトム部とフレームの座用支持パイプの後端の横板とを固定して背シェルをフレームに取り付けるものである。したがって、背シェルは、左右のジョイント部材を介した連結とボトム部での固定により支持されることによって、応力の分散を図ることができてポリプロピレンのような比較的柔らかく剛性不足の樹脂材料を使っても十分な剛性と強度を確保できる。
【００１８】
【発明の実施の形態】
以下、本発明の構成を図面に示す実施形態に基づいて詳細に説明する。
【００１９】
図１に本発明のジョイント構造の一実施形態を示す。このジョイント構造は、少なくとも一方の部材が樹脂成形品である２部材例えば樹脂成形品とこれに連結される連結相手部材とを連結するものであって、樹脂成形品１側に連結相手部材２側に突出するダボ３及びその周りを覆う鞘部４を一体成形すると共に、樹脂成形品１のダボ３に嵌合し尚かつその周りを覆う鞘部４内に挿入可能な第１取付部５ａと連結相手部材２と固定される第２取付部５ｂとを有する金属製ジョイント部材５を取付ねじ６ビスによってダボ３にねじ止めして、鞘部４からジョイント部材５の第２取付部５ｂを突出させるようにしている。そして、この第２取付部５ｂに連結相手部材２を取り付けることによって、樹脂成形品１と連結相手部材２との２部材を連結するようにしている。
【００２０】
樹脂成形品１と一体成形されるダボ３は、金型の型合わせ面において金型の割方向に突出するように設定されることにより、射出成形により樹脂成形品１と一体に成形される。この場合、スライド型等を必要としない簡単な割型を用いて成形できるので、金型も安価なものとなる。ダボ３は、本実施形態の場合、鞘部４より短く、鞘部４の内方に凹むような長さとされている。また、ダボ３はねじ立てを可能とする大きさの穴７を中心に有する筒状を成し、その根元部分にジョイント部材５の回り止めと位置決めのための凸部８が一体成形されている。この凸部８は、ダボ３の根元部分においてダボ３と鞘部４とを径方向に連結するリブを兼ねており、ダボ３の強度を高める。鞘部４は、ジョイント部材５の第１取付部５ａよりも僅かに大きく、がたつきなくジョイント部材５を収めてジョイント部材５とダボ３並びに鞘部４とで剪断力を受けるように設けられている。
【００２１】
金属製ジョイント部材５は、特定の材質や加工法などに限定されるものではないが、軽量で尚かつ成型が容易な例えば亜鉛ダイカストやアルミダイカストなどのによって成型することが好ましい。このジョイント部材５は、樹脂成形品１のダボ３と鞘部４との間に挿入される第１取付部５ａと、連結相手部材２と固定される第２取付部５ｂとから成り、それらの間にはジョイント部材５をダボ３に固定するための座部５ｃを形成する仕切壁を有している。座部５ｃには、第１取付部５ａひいてはジョイント部材５をダボ３に固定するための取付ねじ６を通す穴５ｄが設けられている。この穴５ｄは、取付ねじ６の頭部よりも小さいが首下のねじ部分を通過させうる大きさである。また、第１取付部５ａの先端にはダボ３側の凸部８と嵌り込む凹部９を有している。
【００２２】
第２取付部５ｂの形状ないし構造は、連結相手部材２の形状ないし構造に応じて適宜選択される。本実施形態の場合、連結相手部材２がパイプであるため、これと嵌合する外周面と取付ねじ６を通すための孔とを備えた筒状とされている。また、連結相手部材２がパイプであるため、これの先端部分を収納する鞘部４の内周面形状も円形とされている。したがって、第１取付部５ａの外形状も外周面を有する筒状とされている。ダボ３の横断面形状も特に円形に限られるものではないが、型製作の容易性などを考慮すると円形であることが好ましいことから、第２取付部５ｂも筒状とすることが好ましい。このことから、本実施形態の場合には、ジョイント部材５の第１取付部５ａと第２取付部５ｂは、図５に示すように、共に筒状を成している。また、第２取付部５ｂの外周面には、軸方向に沿って４本のビード１５が等間隔に形成されている。このビード１５は、半円形を成し、第２取付部５ｂの外周面と連結相手部材たるパイプ２の内周面との間の隙間をほぼ埋める高さであり、パイプ２に対してジョイント部材５の第２取付部５ｂを滑らかに挿入可能とすると共にがたつきなく保持する。挿入時に摩擦などの抵抗がないので、スムーズに挿入することができ、取り付けが容易である。
【００２３】
尚、図５に示すジョイント部材５は、割型の型合わせを考慮して両側部分の一部が部分的に直線形状とされており、厳密な意味での円形外周面ではない。また、ジョイント部材５は、少なくともダボ３に嵌合される第１取付部５ａを筒状に形成すれば足り、第２取付部５ｂの形状ないし構造は図５に示すような筒状に特に限定されるものではなく、連結相手部材２の形状や構造に応じた形状や構造が適宜選択れさる。例えば、連結相手部材２がパイプではなく、平板や矩形断面形状ないし非円形の突起のようなものの場合には、平板状金具や１ないし複数本のピン、棒状物あるいは樋形状の断面を有する湾曲した板材などとしても良い。更に、第１取付部５ａは、強度的には円形の外形状として外方からも剪断力を受けることが好ましいが、場合によっては角形の外形状としても可能である。即ち、角柱状のダボ３と角パイプ状の第１取付部５ａとの組み合わせにしても良い。少なくとも力がかかる方向において樹脂成形品１と金属製ジョイント部材５との結合部分が共持ちになる構造を有していれば良い。
【００２４】
ここで、取付ねじ６を通す位置、即ち座部５ｃの穴５ｄ並びにダボ３の穴７の位置は、第１取付部５ａの内周面の中心からジョイント部材５と連結相手部材２とを止めねじ１３で固定する位置とは反対側に偏心して設けられている。そして、第２取付部５ｂに設けられる取付ねじ６を挿入する孔１０も同方向に偏心するように設けられ、第１取付部の厚みを上述の止めねじ１３を取り付ける側に厚くなるように設けている。この厚肉部１１を利用して連結相手部材２たるパイプを取り付けるための止めねじ１３をねじ込むためのねじ孔１２が設けられている。この場合、十分な長さのねじ孔１２が形成できる。また、場合によっては、取付ねじ６の位置を偏心させずに、第１取付部５ａに対して第２取付部５ｂを偏心させることによって厚肉部１１を設けるようにしても良い。
【００２５】
取付ねじ６としては、タッピンネジの使用が好ましい。この場合には、ダボ３の穴７にタッピンねじ６をねじ込むだけでねじ立が行われるので、射出成形時の型構造が極めて簡単となる。取付ねじ６は、ダボ３に嵌合されるジョイント部材５の抜け止め程度の固着力があれば足りるので、タッピンねじで十分である。勿論、インサート成形により樹脂成形品１の射出成形と同時にナットやその他の雌ねじ部材をダボ３に予め埋設したり、別工程でねじを加工することも可能である。このような場合には、取付ねじ６としては、タッピンねじを用いずに、一般的な止めねじを用いる。
【００２６】
以上のように構成されたジョイント構造によれば、金属製ジョイント部材５の第１取付部５ａを樹脂成形品１のダボ３に嵌合してからタッピンねじ６を第２取付部５ｂの孔１０を通して座部５ｃの穴５ｄからダボ３の穴７にねじ込むことによって、ジョイント部材５をダボ３に簡単に取り付けることができる。その後、ジョイント部材５の第２取付部５ｂを連結相手部材たるパイプ２に嵌め込んでから、パイプ２のばか孔１４からねじ孔１２に止めねじ１３をねじ込んで第２取付部５ｂとパイプ２とを止めつける。このとき、連結相手部材・パイプ２の先端部分が鞘部４の中に収容されて連結端部が隠れると共に、鞘部４の外に露出した第２連結部５ｂと連結相手部材２との取り付けは連結相手部材・パイプ２の裏の隠れた部分において止めねじ１３を利用して行われるので、取付の形跡を目に付きやすい部分の外観に残さない。更に、止めねじ１３はそれを覆い隠すカバー例えば肘掛けパッド２０などの存在によって隠されるので、連結箇所付近では一層取付の痕跡を残すことがない。また、連結を解除する場合には、各ねじ１３，６を順に外すことによって、樹脂成形品１と金属製ジョイント部材５及び連結相手部材２とが簡単に分離される。
【００２７】
図７及び図８に、図１に示すジョイント構造をカンチレバータイプの椅子に適用した実施形態を示す。この椅子は、座シェル２３および背シェル２１をパイプフレームから成る脚フレーム２２で支持するようにしたものである。座シェル２３と背シェル２１とは樹脂製である。ここで、連結対象となる２部材としては、脚フレーム２２の肘掛け部分を構成するパイプ２２ａと樹脂製背シェル２１であって、射出成形によって背シェル２１とダボ３並びに鞘部４とが一体成形されている。
【００２８】
樹脂成形品１たる背シェル２１とダボ３並びに鞘部４との関係は、例えば図６に示すように、背シェル２１の腰部付近に設定される両側の肘掛け部２２ａに対応する位置に鞘部４とダボ３とが配置されるように一体成形されている。また、連結相手部材２としては、脚フレーム２２の肘掛け部を構成するパイプ２２ａであり、ジョイント部材５の第２連結部５ｂのねじ孔１２にパイプ２２ａを嵌め込んだ状態でねじ込む止めねじ１３を通すばか孔１４が対応する位置に開けられている。
【００２９】
脚フレーム２２は、１本のパイプを折り曲げることによって、床面に当たるコの字形の脚支え部２２ｃと、脚支え部２２ｃの前端からやや後方へ傾きながら立ち上がる２本の脚部２２ｂと、脚部２２ｂの上端から後方に折り曲げられ背シェル２１と連結される肘掛け部２２ａとを構成し、座シェル２３並びに背シェル２１を片持ち支持する構造とされている。左右の脚部２２ｂの座の高さの部分には、後方へ向けて延びる座用支持パイプ２２ｄとそれらを前端と後端においてそれぞれ幅方向に連結する横板２４，２５とが備えられている。前端の横板２４は座シェル２３の前端を装着して支持し、後端の横板２５は背シェル２１の下端部を取り付けて支持する。これによって、座シェル２３は更に背シェル２１が取り付けられた横板２５の上に載置されることによって後端部が支持されている。
【００３０】
背シェル２１と脚フレーム２２とは、左右の肘掛け部のパイプ２２ａとそれぞれ連結される２ヶ所の金属ジョイント部材５を含むジョイント構造とボトム部１８のリブ１９とフレーム横板２５とのビス止めによって連結されている。背シェル２１のボトム部１８には金型の割方向に突出するリブ１９を形成し、このリブ１９にフレーム横板２５を差し込んで取り付ける。座シェル２３の底面の後端部寄りの部位には、横板２５の下に潜り込み横板２５と上下方向には係合するも座シェル２３を前方へスライドさせるときには妨げと成らないクリップ（図示省略）が設けられている。更に、座シェル２３の底面の後端にも背シェル２１の奥行き部に形成されているリブ２６と係合し座シェル２３の後端部が浮上するのを防ぐように上下方向には係合するも座シェル２３を前方へスライドさせるときには妨げと成らないクリップ（図示省略）が設けられている。
【００３１】
背シェル２１はガラス繊維などの補強繊維が含まれていない非強化樹脂、例えばポリプロピレン樹脂製で、図６及び図７、８に示すように、立て壁部１７とボトム部１８とから成るバケット形状を成している。そして、背シェル２１の脚フレーム２２の肘掛け部２２ａへの取付部には、肘掛け部２２ａへ向けて突出する筒状の鞘部４と同心状のダボ３を有している。尚、鞘部４、ダボ３および凸部８などは金型の割方向となるように設けられている。
【００３２】
肘掛けパッド２０は、脚フレーム２２の肘掛け部２２ａに嵌合される樹脂製の筒であり、止めねじ１３の頭部を覆い、尚かつ金属製パイプの冷たさが伝わらないようにしている。この肘掛けパッド２０にはフィンが設けられ、背シェル２１と当接する端面に設けられた位置決め用ダボ１６と嵌合するダボ孔（図示省略）が設けられている。この肘掛けパッド２０の裏面の前端寄りの部位には、固定用の止めねじ２７を通すばか孔（図示省略）が設けられている。このばか孔を通して止めねじ２７がパイプ２２ａのねじ孔（図示省略）にねじ込まれる。
【００３３】
以上のように構成された本実施形態のカンチレバー椅子においては、背シェル２１と脚フレーム２２の肘掛け部２２ａとの連結は、先ず、背シェル２１の鞘部４のダボ３にジョイント部材５を嵌め込んで周り止めの凹部９と凸部８とを合わせて位置決めした後、タッピンねじ６を第２取付部５ｂの孔１０から差し込んでねじ立てを行う。次いで、脚フレーム２２の横板２５を背シェル２１のボトム部１８のリブ１９の下に差し込むように嵌合させながら、鞘部４から突出したジョイント部材５の第２取付部５ｂに肘掛け部のパイプ２２ａを嵌合する。そして、肘掛け部のパイプ２２ａのばか孔１４から止めねじ１３を第２取付部５ｂのねじ孔１２にねじ込んで、パイプ２２ａとジョイント部材５とを連結する。その後、肘掛け部パイプ２２ａに予め嵌め込み退避していた肘掛けパッド２０をずらして、背シェル２１の鞘部４に当接させる。そして、肘掛けパッド２０の先端寄りのばか孔から止めねじ２７をパイプ２２ａのねじ孔にねじ込んで肘掛けパッド２０をパイプ２２ａに固定する。これによって、背シェル２１と脚フレーム２２の肘掛け部２２ａとの連結を外観に痕跡を残さずに実現できる。
【００３４】
つぎに、脚フレーム２２の横板２５と背シェル２１のボトム部１８のリブ１９とをビス止めによって固定する。背シェル２１は、左右の肘掛け部のジョイント部材５を介した連結とボトム部１８のリブ１９での２カ所のビス止めとの計４カ所での支持されることによって、応力の分散を図ることができてポリプロピレンのような比較的柔らかく剛性不足の樹脂材料を使っても十分な剛性と強度を確保できる。更に、一方向から組み付けられるので、組み立て作業が容易である。
【００３５】
なお、上述の実施形態は本発明の好適な実施の一例ではあるがこれに限定されるものではなく、本発明の要旨を逸脱しない範囲において種々変形実施可能である。即ち、本実施形態では、カンチレバータイプの椅子の肘と背シェルとの連結部位のように直交する２部材を連結するのに適用した場合について主に説明したが、この部分あるいは部品に特に限定されるものではなく、さまざまな部位や部品ないし製品にも適用できる。例えば、本実施形態では肘掛けを有するカンチレバー椅子の肘掛け部と背シェルとの連結に適用した例について主に説明したが、４本足のパイプ椅子や回転椅子などにも適用可能であるし、椅子以外の製品にも適用可能である。また、連結部位は、サークル脚や４本脚などの固定パイプ脚あるいは回転椅子の背支桿と背シェルとの連結、脚の前端から背シェルに向けて後方に傾斜するように立ち上がるカンチレバー脚と背シェルとの連結、樹脂製座シェルと座支持フレームないし背支桿との連結あるいは樹脂製座シェルと樹脂製背シェルとの連結など、樹脂製シェルとそれに結合するフレームないしその他の樹脂製品や金属製品・セラミック製品などとの結合に広く適用することができる。即ち、金属製ジョイント５を介して連結される２部材は、少なくとも一方が樹脂成形品であれば足りるが、双方が樹脂成形品であっても良い。また、ジョイント構造は樹脂成形品に対して形成される方向や部位などを限定されるものではなく、図７の実施形態のように背シェルに対して直交するように配置しても良いし、背シェルと同方向に延びる背支桿との間の連結のように、樹脂成形品の本体と同じ方向に延びる２部材の間の連結にも適用できる。また、本実施形態では、連結相手部材２あるいは連結部材たるパイプ２２ａは連結強度をより高めるために鞘部４の中にその先端部分を挿入するようにしているが、これに特に限定されるものではなく、先端部分を鞘部４内に挿入せずに鞘部４の開口端で突き合わるようにして連結するようにしても良い。この場合でも、取付けの痕跡は外観上に表れず、装飾性に優れることは同様である。また、ジョイント部材５の第２取付部５ｂと連結相手部材２（パイプ２２ａ）とを連結する止めねじ１３の頭を隠すカバーや肘掛けパッド２０のようなものは場合によっては使われない。また、本実施形態では、ジョイント部材５の固定には取付ねじ特にタッピンねじを用いた場合について主に説明したがこれに特に限定されるものではなく、その他の着脱可能な固定手段を採用することができることは言うまでもない。
【００３６】
【発明の効果】
以上の説明から明らかなように、本発明のジョイント方法によると、金属製ジョイント部材をダボに嵌合して固定してから、ジョイントの取り付け部を利用して連結相手部材を固定して連結するするようにしているので、ジョイント部材の取付けが容易であると共に連結相手部材の取付も簡単にでき作業効率が良い。また、ジョイント部材をダボから取り外すだけで、樹脂成形品と金属製ジョイント部材とが分離できるので、分別廃棄が可能となるとともに樹脂成形品のリサイクルが容易となる。しかも、連結相手部材はダボとその周りを覆う鞘部とによって保持された金属製ジョイント部材を介して連結されるので、取り付けた形跡のない連結構造でありながら、十分な剛性と強度を確保できる。
【００３７】
また、本発明のジョイント構造によると、金属製ジョイント部材をねじ止めするだけで組み立てられるので、作業効率が良い。また、取付ねじを緩めるだけで、樹脂成形品と金属製ジョイント部材とが分離できるので、分別廃棄が可能となるとともに樹脂成形品のリサイクルが容易となる。しかも、連結相手部材はダボとその周りを覆う鞘部とによって保持された金属製ジョイント部材を介して連結されるので、取り付けた形跡のない連結構造でありながら、十分な剛性と強度を確保できる。
【００３８】
また、請求項３記載の発明によると、樹脂成形品のダボと金属製ジョイント部材とを嵌合させタッピンねじでねじ立てするだけで一体化でき、更にビスを使って他方の部材を取り付けることができるので、２部材の連結作業例えばパイプ椅子の各構成部品の組み立て作業が容易となり、作業効率が向上する。しかも、樹脂成形品を成形する際にナット等の雌ねじ部材をインサートしたり、ねじ孔を後加工する必要がなくなるし、樹脂成形品側に一切金属が含まれないので、分別廃棄及びリサイクルに効果的である。
【００３９】
また、請求項４記載の発明によると、ジョイント部材をダボに嵌め込みながら回転させるだけで回り止め部に対応する位置で自然に係合するので、位置決めが容易である。加えて、ジョイント部材と連結相手部材との間の固定例えばビス止めなども、ねじ孔位置がずれることが少なく、組み立てやねじの締め付けに手間取ったり、ねじが効かなくなる虞も少ない。
【００４０】
更に、請求項５記載の発明にかかる椅子によると、樹脂製背シェルのダボに金属製ジョイント部材を嵌合させて取付ねじで固定してから、フレーム例えば脚パイプや背支桿などを金属製ジョイントの第２取付部に嵌め込みあるいは組み込んでビスなどで裏側あるいはカバーなどで隠せる部分から固定するだけで、フレームと背シェルとの組み立て作業が完了すると共に取付の形跡を外観に残さないようにできる。したがって、椅子の組み立て作業が容易かつ効率的となりコストダウンが可能となる。
【００４１】
また、請求項６記載の発明にかかる椅子によると、樹脂製背シェルのダボに金属製ジョイント部材を嵌合させて取付ねじで固定してから、脚フレームの肘掛け部のパイプを金属製ジョイントの第２取付部に嵌め込んでビスなどでパイプの裏側から固定するだけで、脚フレームと背シェルとの組み立て作業が完了すると共に取付の形跡を外観に残さないようにできる。したがって、椅子の組み立て作業が容易かつ効率的となりコストダウンが可能となる。
【００４２】
また、請求項７記載の発明によると、ガラス繊維などの補強繊維が含まれた強化樹脂を使わずにポリプロピレンなどの比較的柔らかい・弱い樹脂を使うことができるので、リサイクルに便利である。
【図面の簡単な説明】
【図１】本発明のジョイント構造の一実施形態を示す縦断面図である。
【図２】図１のジョイント構造のII-II線に沿う縦断面図である。
【図３】図１のIII−III線に沿う横断面図である。
【図４】図１のIV−IV線に沿う横断面図である。
【図５】ジョイント部材の一例を示す斜視図で、第２取付部を仮想線で示す。
【図６】本発明のジョイント構造をカンチレバータイプのパイプ椅子に適用した実施形態における鞘部とダボの一例を一部断面して示す斜視図である。
【図７】カンチレバータイプのパイプ椅子の縦断面図である。
【図８】図７の椅子の背シェルと脚フレームとの関係を示す半裁平面図である。
【図９】従来のカンチレバータイプのパイプ椅子の脚フレームと腰掛け部とのジョイント構造を示す斜視図である。
【図１０】従来のジョイント構造を脚フレームと腰掛け部との連結に適用したカンチレバータイプパイプ椅子の外観を示す斜視図である。
【符号の説明】
１樹脂成形品
２連結相手部材
３ダボ
４鞘部
５金属製ジョイント部材
５ａ第１取付部
５ｂ第２取付部
５ｃ座部
５ｄ取付ねじを通す穴
６タッピングねじ（取付ねじ）
８回り止め用凸部
９回り止め用凹部
２１樹脂成形品としての背シェル
２２ａ肘掛け部分を構成するパイプ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a joint structure and method for connecting two members (parts) in which at least one member is a resin molded product, and a chair using the joint structure and method. More specifically, the present invention relates to a joint structure and method that do not leave a mark attached to the appearance, and a chair using the joint structure and method.
[0002]
[Prior art]
When connecting two members (parts) in which at least one member is a resin molded product, a joint structure that does not leave a trace attached to the appearance is desired. For example, in a cantilever-type pipe leg chair as shown in FIG. 10, the connection between the leg pipe 101 and the stool (the seat and the back are integrated) has a joint structure as shown in FIG. This is done via the joint 103.
[0003]
In this joint structure, an insertion portion 105 made of a cylindrical protrusion protruding toward the pipe 104 is integrated with an upper end of the resin joint 103 screwed to the stool portion 102, that is, a portion facing the pipe 104 constituting the armrest portion. A connection structure which is provided by molding and is invisible from the outside is realized by fitting the insertion portion 105 to the pipe 104. That is, a cylindrical insertion portion 105 is integrally formed on the resin joint 103 side, and a screw hole 106 opened in the radial direction is provided. The insertion portion 105 is provided on the pipe 104 side in a state where the insertion portion 105 is inserted into the pipe 104. A screw 108 is screwed from the hole 107 and fixed. Further, in order to prevent the joint 103 and the pipe 104 from idling, a rotation preventing portion 109 made of a protrusion is integrally formed at the base portion of the insertion portion 105 of the joint 103, and the joint 104 side is formed on the tip surface of the pipe 104. A recess 110 that fits with the rotation stopper 109 is provided. Furthermore, an armrest holding portion 111 is provided at the base portion of the insertion portion 105 so as to surround the insertion portion 105 and fit the end of the armrest pad 112 into a gap between the insertion portion 105 and cover the end portion to improve the appearance. ing.
[0004]
Here, when the insertion part 105 is formed only with resin, there exists a possibility that it may be broken by the shearing force applied to the root part of the insertion part 105. Therefore, in order to prevent shearing of the insertion portion 105, the knock pin 113 is driven into the insertion portion immediately after the joint 103 is molded by injection molding to reinforce the insertion portion 105. The insertion portion 105 is also provided with a screw hole 106 for fastening a screw 108 for fixing the pipe 104 fitted therein by post-processing. The screw hole 106 is opened by tapping so as to penetrate the resin insertion portion 105 and the metal knock pin 113 in the radial direction.
[0005]
Further, in the case of a chair that takes a form in which the shell of the back and the seat is separated, a reinforced resin reinforced with glass fiber must be used as the shell material. By reinforcing the resin with glass fiber, for example, when the back shell is formed in a single plate shape as a whole, the structural strength can be ensured.
[0006]
[Problems to be solved by the invention]
However, since the metal knock pin 113 is press-fitted into the insertion portion 105, the knock pin 113 and the insertion portion 105 (and hence the resin joint 103) cannot be separated, so that it is difficult to dispose of and separate or recycle.
[0007]
Further, post-processing such as driving and threading of the knock pin 113 is required, which takes time and increases the processing cost. In addition, the process of opening the screw hole 106 so as to penetrate different materials of the metal knock pin 113 and the relatively soft resin insertion portion 105 is likely to shift the hole position, and it takes time to assemble and tighten the screw, and the screw does not work. There is a fear.
[0008]
Further, in order to give a shearing force applied to the connecting portion only with the knock pin 113, since the resin fitting cost is small, this structure is not suitable when a larger rigidity and strength are desired.
[0009]
In addition, when glass fiber reinforced resin is used as a resin molded product, the glass fiber is broken when the resin molded product is crushed, so it cannot be regenerated as glass fiber reinforced plastic. It can not be used as a material for ordinary recycled resin because it damages the screw of the container. For this reason, it was difficult to recycle
[0010]
It is an object of the present invention to make it possible to easily separate a resin part and a metal part in a joint structure and method that can be connected without leaving any trace of mounting on the appearance. Moreover, an object of this invention is to provide the joint method and structure which can bear a shear force only with a joint member. Furthermore, an object of the present invention is to provide a chair having a joint structure that can use parts made of a single resin material without using a strong resin such as a glass fiber reinforced resin.
[0011]
[Means for Solving the Problems]
In order to achieve such an object, the joint method according to the first aspect of the present invention comprises: Between the resin molded product and the connection partner member connected to it In the joint method for connecting two members, the resin molded product is connected to the connection partner member side. Towards A metal having a projecting dowel and a sheath covering the periphery thereof, and having a cylindrical first mounting portion that is inserted into the sheath and fits with the dowel and a second mounting portion that is attached to the connecting member. The joint member is fixed to the dowel, and with the tip of the connection partner member inserted into the sheath, the connection partner member is fixed to the second mounting portion of the metal joint member to connect the resin molded product and the connection partner member. I am doing so.
[0012]
Such a joint method is realized, for example, by the joint structure according to claim 2. That is, the joint structure according to the invention of claim 2 is: Between the resin molded product and the connection partner member connected to it In a joint structure for connecting two members, a dowel projecting to a connecting mating member side integrally formed with a resin molded product, a sheath portion covering the dowel, and a cylindrical first member inserted into the sheath portion and fitted to the dowel A metal joint member having a first attachment portion and a second attachment portion attached to the connection partner member and a seat portion that contacts the tip surface of the dowel, and a screw member that passes through the seat portion of the joint member and is screwed into the dowel. A connecting mating member having a distal end inserted into a sheath portion of the resin molded product is attached to the second mounting portion of the metal joint member screwed to the dowel. Are connected to each other.
[0013]
According to such a joint method and joint structure, when the first mounting portion of the metal joint member is fitted and fixed to the dowel of the resin molded product, the connection partner member is then stopped on the second mounting portion of the joint member. The joint member can be easily attached by attaching it, and the efficiency of the attaching operation is good. In addition, the joint portion between the joint member and the resin molded product is hidden in the sheath portion, and the joint member and the connection partner member outside the sheath portion are attached to the connection partner member such as a screw in a hidden portion on the back of the pipe. Since it is done by using, it does not leave the appearance of the attachment in the appearance of the easily visible part. Moreover, since the joint member is held together by the metal joint member and the sheath portion, and the joint member is also held by the dowel and the sheath portion covering the periphery thereof, sufficient rigidity and strength can be secured. Furthermore, according to the joint method of the present invention, the resin molded product and the metal joint member can be separated simply by removing the metal joint fixed to the dowel. Therefore, it is possible to separate and discard the resin molded product. In particular, in the case of the joint structure of the present invention, the joint member is fixed to the dowel with a mounting screw. Therefore, the resin molded product and the metal joint member can be easily separated just by loosening them. Effective for recycling resin molded products.
[0014]
According to a third aspect of the present invention, in the joint structure according to the second aspect, the mounting screw is a tapping screw and is tapped on a dowel. In this case, it is not necessary to insert a female screw member such as a nut or to post-process the screw hole when molding a resin molded product.
[0015]
According to a fourth aspect of the present invention, in the joint structure according to the second or third aspect, the first fitting portion of the joint member is protruded from the front end surface of the joint member and around the base portion of the dowel to prevent rotation. A portion and a concave portion are provided. In this case, positioning is easy because the joint member is naturally engaged at a position corresponding to the anti-rotation portion by simply rotating the joint member while fitting it into the dowel. In addition, since the positional relationship between the joint member and the dowel is uniquely determined, the relationship between the joint member and the connection partner member is also uniquely determined. Moreover, since the joint member is made of metal and made of a single material, it is difficult for displacement to occur even when a screw hole or the like is opened. Accordingly, the fixing between the joint member and the connection partner member, for example, screwing, is less likely to shift the screw hole position, and there is little possibility that the assembly or tightening of the screw takes time and the screw is not effective.
[0016]
Furthermore, the chair concerning invention of Claim 5 connects the resin-made back shell and the flame | frame couple | bonded to it using the joint structure in any one of Claim 2-4. Here, the frame coupled to the resin back shell is not particularly limited, but may be a back support rod extending from a leg pipe of a rotary chair or a fixed chair, or a part of the frame supporting the seat. Or In this case, after fitting the metal joint member to the dowel of the resin back shell and fixing with the mounting screw, the pipe-like structure such as the back support rod or other structure is attached to the second joint of the metal joint. Assemble the frame and back shell without leaving traces of mounting by simply fixing it from the back of the part that appears in an easy-to-see appearance by fitting or overlapping the mounting part, or from the part that can be hidden with a cover, etc. Can do. Furthermore, the chair according to the invention described in claim 6 is characterized in that the frame is a pipe constituting an armrest portion. In this case, the metal joint member is fitted into the dowel of the resin back shell and fixed with the mounting screw, and then the pipe of the armrest portion of the leg frame is fitted into the second mounting portion of the metal joint to tighten the screw. By simply fixing from the back side of the pipe, the assembly work of the armrest portion of the leg frame and the back shell can be completed and the trace of the attachment can be left in the appearance.
[0017]
The invention according to claim 7 is the chair according to claim 6, When the frame bends one pipe, a U-shaped leg support that hits the floor, two legs that rise from the front end of the leg support, and a back shell that is bent backward from the upper end of each leg. A cantilever type frame comprising: an armrest connected to each other; and a seat support pipe that extends rearward at a seat height portion of the left and right legs and is connected at least at the rear end by a horizontal plate in the width direction. The back shell has a bucket shape including a sheath portion, a standing wall portion, and a bottom portion that are respectively connected to the armrest portion of the frame by a non-reinforced resin, and between the sheath portion of the back shell and the armrest portion of the frame. Is connected using the joint structure according to any one of claims 2 to 4, and the bottom shell and the horizontal plate at the rear end of the seat support pipe of the frame are fixed to attach the back shell to the frame. That . Therefore, the back shell is supported by the connection through the left and right joint members and fixed at the bottom part, so that the stress can be dispersed and a relatively soft and insufficiently rigid resin material such as polypropylene is used. However, sufficient rigidity and strength can be secured.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the configuration of the present invention will be described in detail based on embodiments shown in the drawings.
[0019]
FIG. 1 shows an embodiment of the joint structure of the present invention. In this joint structure, at least one member is a resin molded product. For example, a resin molded product and a connection partner member connected to the resin molded product The dowels 3 projecting to the connecting mating member 2 side and the sheath 4 covering the periphery thereof are integrally formed on the resin molded product 1 side, and the dowels 3 of the resin molded product 1 are not yet fitted. The metal joint member 5 having the first mounting portion 5a that can be inserted into the sheath portion 4 that covers the periphery and the second mounting portion 5b that is fixed to the connection partner member 2 is screwed into the dowel 3 with the mounting screw 6 screw. The second mounting portion 5b of the joint member 5 is protruded from the sheath portion 4 by stopping. And the 2 member of the resin molded product 1 and the connection other member 2 is connected by attaching the connection other member 2 to this 2nd attachment part 5b.
[0020]
The dowel 3 integrally molded with the resin molded product 1 is formed integrally with the resin molded product 1 by injection molding by setting so as to protrude in the mold splitting direction on the mold mating surface of the mold. In this case, since it can be molded using a simple split mold that does not require a slide mold or the like, the mold is also inexpensive. In the present embodiment, the dowel 3 is shorter than the sheath portion 4 and has a length that is recessed inward of the sheath portion 4. Further, the dowel 3 is formed in a cylindrical shape having a hole 7 having a size capable of tapping, and a convex portion 8 for preventing rotation and positioning of the joint member 5 is integrally formed at the base portion thereof. . The convex portion 8 also serves as a rib that connects the dowel 3 and the sheath portion 4 in the radial direction at the root portion of the dowel 3, and increases the strength of the dowel 3. The sheath portion 4 is slightly larger than the first attachment portion 5a of the joint member 5, and is provided so as to receive the shearing force between the joint member 5, the dowel 3 and the sheath portion 4 without the backlash. ing.
[0021]
The metal joint member 5 is not limited to a specific material or processing method, but is preferably molded by, for example, zinc die casting or aluminum die casting that is lightweight and easy to mold. The joint member 5 includes a first attachment portion 5a inserted between the dowel 3 and the sheath portion 4 of the resin molded product 1, and a second attachment portion 5b fixed to the connection partner member 2. A partition wall for forming a seat portion 5c for fixing the joint member 5 to the dowel 3 is provided therebetween. The seat portion 5c is provided with a hole 5d through which the first mounting portion 5a and thus the mounting screw 6 for fixing the joint member 5 to the dowel 3 are passed. The hole 5d is smaller than the head of the mounting screw 6 but has a size that allows a threaded portion under the neck to pass therethrough. Moreover, the front-end | tip of the 1st attaching part 5a has the recessed part 9 fitted with the convex part 8 by the side of the dowel 3. FIG.
[0022]
The shape or structure of the second mounting portion 5 b is appropriately selected according to the shape or structure of the connection partner member 2. In the case of this embodiment, since the connection partner member 2 is a pipe, it is made into the cylinder shape provided with the outer peripheral surface fitted to this and the hole for letting the attachment screw 6 pass. Moreover, since the connection partner member 2 is a pipe, the inner peripheral surface shape of the sheath part 4 which accommodates the front-end | tip part is also made circular. Therefore, the outer shape of the first mounting portion 5a is also a cylindrical shape having an outer peripheral surface. The cross-sectional shape of the dowel 3 is not particularly limited to a circular shape, but it is preferable that the second mounting portion 5b is also a cylindrical shape because it is preferably a circular shape in consideration of the ease of mold production. From this, in the case of this embodiment, as shown in FIG. 5, both the 1st attaching part 5a and the 2nd attaching part 5b of the joint member 5 have comprised the cylindrical shape. Further, four beads 15 are formed at equal intervals along the axial direction on the outer peripheral surface of the second mounting portion 5b. The bead 15 is semicircular and has a height that substantially fills the gap between the outer peripheral surface of the second mounting portion 5b and the inner peripheral surface of the pipe 2 that is a connection partner member. 5 can be smoothly inserted and held without rattling. Since there is no resistance such as friction at the time of insertion, it can be inserted smoothly and easy to install.
[0023]
In addition, the joint member 5 shown in FIG. 5 is not a circular outer peripheral surface in a strict sense because part of both side portions is partially linear in consideration of split mold matching. Further, it is sufficient for the joint member 5 to form at least the first mounting portion 5a fitted to the dowel 3 in a cylindrical shape, and the shape or structure of the second mounting portion 5b is particularly limited to a cylindrical shape as shown in FIG. Instead, the shape and structure corresponding to the shape and structure of the connection partner member 2 are appropriately selected. For example, when the connection partner member 2 is not a pipe but a flat plate, a rectangular cross-sectional shape or a non-circular protrusion, a curved plate having a flat metal fitting, one or more pins, a rod-like object, or a bowl-shaped cross section. It is good also as a finished board material. Further, in terms of strength, the first mounting portion 5a preferably has a circular outer shape and receives a shearing force from the outside. However, in some cases, the first mounting portion 5a may have a rectangular outer shape. That is, a combination of the prismatic dowel 3 and the square pipe-shaped first attachment portion 5a may be used. What is necessary is just to have a structure where the joint part of the resin molded product 1 and the metal joint member 5 is held together at least in the direction in which the force is applied.
[0024]
Here, the position through which the mounting screw 6 is passed, that is, the position of the hole 5d of the seat portion 5c and the hole 7 of the dowel 3 stops the joint member 5 and the connecting counterpart member 2 from the center of the inner peripheral surface of the first mounting portion 5a. Eccentricity is provided on the opposite side of the position fixed by the screw 13. The hole 10 for inserting the mounting screw 6 provided in the second mounting portion 5b is also provided to be eccentric in the same direction, and the thickness of the first mounting portion is provided so as to be thicker on the side where the set screw 13 is attached. ing. A screw hole 12 is provided for screwing a set screw 13 for attaching a pipe as the connection counterpart member 2 using the thick portion 11. In this case, a sufficiently long screw hole 12 can be formed. Moreover, depending on the case, you may make it provide the thick part 11 by decentering the 2nd attachment part 5b with respect to the 1st attachment part 5a, without making the position of the attachment screw 6 eccentric.
[0025]
A tapping screw is preferably used as the mounting screw 6. In this case, since the tapping is performed only by screwing the tapping screw 6 into the hole 7 of the dowel 3, the mold structure at the time of injection molding becomes very simple. As the mounting screw 6, it is sufficient that the joint member 5 fitted to the dowel 3 has a fixing force enough to prevent the joint member 5 from coming off. Therefore, a tapping screw is sufficient. Of course, it is possible to embed a nut or other female screw member in advance in the dowel 3 at the same time as injection molding of the resin molded product 1 by insert molding, or to process a screw in a separate process. In such a case, a general set screw is used as the mounting screw 6 without using a tapping screw.
[0026]
According to the joint structure configured as described above, after the first attachment portion 5a of the metal joint member 5 is fitted to the dowel 3 of the resin molded product 1, the tapping screw 6 is attached to the hole 10 of the second attachment portion 5b. The joint member 5 can be easily attached to the dowel 3 by screwing into the hole 7 of the dowel 3 from the hole 5d of the seat portion 5c. Thereafter, the second mounting portion 5b of the joint member 5 is fitted into the pipe 2 which is a connection partner member, and then the set screw 13 is screwed into the screw hole 12 from the flaw hole 14 of the pipe 2 to thereby connect the second mounting portion 5b and the pipe 2 To stop. At this time, the connection partner member / pipe 2 is housed in the sheath portion 4 so that the connection end portion is hidden, and the second connection portion 5b exposed to the outside of the sheath portion 4 and the connection partner member 2 are attached. Is performed by using the set screw 13 in the hidden part of the back of the connection partner member / pipe 2, so that no trace of attachment is left in the appearance of the easily visible part. Furthermore, since the set screw 13 is hidden by the presence of a cover for covering it, such as the armrest pad 20, there is no further trace of attachment near the connection point. Moreover, when canceling | releasing a connection, the resin molded product 1, the metal joint member 5, and the connection partner member 2 are easily isolate | separated by removing each screw 13 and 6 in order.
[0027]
7 and 8 show an embodiment in which the joint structure shown in FIG. 1 is applied to a cantilever type chair. In this chair, a seat shell 23 and a back shell 21 are supported by a leg frame 22 made of a pipe frame. The seat shell 23 and the back shell 21 are made of resin. Here, the two members to be connected are the pipe 22a constituting the armrest portion of the leg frame 22 and the resin back shell 21, and the back shell 21, the dowel 3 and the sheath 4 are integrally formed by injection molding. Has been.
[0028]
For example, as shown in FIG. 6, the relationship between the back shell 21, which is the resin molded product 1, the dowel 3, and the sheath portion 4 is a sheath portion at a position corresponding to the armrest portions 22 a on both sides set near the waist of the back shell 21. 4 and the dowel 3 are integrally molded. Further, the connecting member 2 is a pipe 22 a that constitutes an armrest portion of the leg frame 22, and a set screw 13 that is screwed in a state where the pipe 22 a is fitted in the screw hole 12 of the second connecting portion 5 b of the joint member 5. The through hole 14 is opened at a corresponding position.
[0029]
The leg frame 22 has a U-shaped leg support portion 22c that hits the floor surface by bending one pipe, two leg portions 22b that stand up slightly backward from the front end of the leg support portion 22c, and a leg portion. The armrest 22a is bent backward from the upper end of 22b and connected to the back shell 21, and the seat shell 23 and the back shell 21 are cantilevered. Seat support pipes 22d extending rearward and horizontal plates 24 and 25 for connecting them in the width direction at the front end and the rear end are provided at the seat height portion of the left and right legs 22b. . The front end horizontal plate 24 is attached and supported by the front end of the seat shell 23, and the rear end horizontal plate 25 is attached and supported by the lower end portion of the back shell 21. Thus, the rear end portion of the seat shell 23 is supported by being placed on the horizontal plate 25 to which the back shell 21 is attached.
[0030]
The back shell 21 and the leg frame 22 are formed by a joint structure including two metal joint members 5 respectively connected to the left and right armrest pipes 22a, and screws between the ribs 19 of the bottom portion 18 and the frame horizontal plate 25. It is connected. A rib 19 protruding in the split direction of the mold is formed on the bottom portion 18 of the back shell 21, and a frame horizontal plate 25 is inserted and attached to the rib 19. A clip (not shown) that sinks under the lateral plate 25 and engages with the lateral plate 25 in the vertical direction, but does not interfere when the seat shell 23 is slid forward. (Omitted) is provided. Furthermore, it engages with the rib 26 formed in the depth part of the back shell 21 also at the rear end of the bottom surface of the seat shell 23 so as to prevent the rear end part of the seat shell 23 from floating up and down. However, when the seat shell 23 is slid forward, a clip (not shown) that does not interfere is provided.
[0031]
The back shell 21 is made of non-reinforcing resin not containing reinforcing fibers such as glass fiber, for example, polypropylene resin, and as shown in FIGS. 6, 7, and 8, a bucket shape including a standing wall portion 17 and a bottom portion 18. Is made. And the attachment part to the armrest part 22a of the leg frame 22 of the back shell 21 has the cylindrical sheath part 4 and the concentric dowel 3 which protrude toward the armrest part 22a. In addition, the sheath part 4, the dowel 3, the convex part 8, etc. are provided so that it may become the split direction of a metal mold | die.
[0032]
The armrest pad 20 is a resin tube fitted to the armrest portion 22a of the leg frame 22, covers the head of the set screw 13, and prevents the coldness of the metal pipe from being transmitted. The armrest pad 20 is provided with fins, and is provided with dowel holes (not shown) for fitting with positioning dowels 16 provided on the end surface in contact with the back shell 21. A portion near the front end of the back surface of the armrest pad 20 is provided with a flaw hole (not shown) through which the fixing set screw 27 is passed. The set screw 27 is screwed into the screw hole (not shown) of the pipe 22a through this hole.
[0033]
In the cantilever chair of the present embodiment configured as described above, the joint member 5 is first fitted to the dowel 3 of the sheath portion 4 of the back shell 21 in order to connect the back shell 21 and the armrest portion 22a of the leg frame 22. Then, after positioning the concave portion 9 and the convex portion 8 to prevent rotation, the tapping screw 6 is inserted from the hole 10 of the second mounting portion 5b and tapped. Next, while fitting the horizontal plate 25 of the leg frame 22 so as to be inserted under the rib 19 of the bottom portion 18 of the back shell 21, the armrest portion is attached to the second attachment portion 5 b of the joint member 5 protruding from the sheath portion 4. The pipe 22a is fitted. Then, the set screw 13 is screwed into the screw hole 12 of the second attachment portion 5b from the flaw hole 14 of the pipe 22a of the armrest portion, and the pipe 22a and the joint member 5 are connected. Thereafter, the armrest pad 20 that has been fitted and retracted in advance in the armrest pipe 22 a is shifted and brought into contact with the sheath 4 of the back shell 21. Then, the armrest pad 20 is fixed to the pipe 22a by screwing the set screw 27 into the screw hole of the pipe 22a from the flaw hole near the tip of the armrest pad 20. As a result, the connection between the back shell 21 and the armrest portion 22a of the leg frame 22 can be realized without leaving any trace on the appearance.
[0034]
Next, the horizontal plate 25 of the leg frame 22 and the rib 19 of the bottom portion 18 of the back shell 21 are fixed by screws. The back shell 21 is supported at a total of four locations, that is, the connection via the joint member 5 of the left and right armrests and the two screws at the ribs 19 of the bottom 18, thereby distributing stress. Even if a relatively soft and insufficiently rigid resin material such as polypropylene is used, sufficient rigidity and strength can be secured. Furthermore, since it is assembled | attached from one direction, an assembly operation is easy.
[0035]
The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the gist of the present invention. That is, in this embodiment, the case where the present invention is mainly applied to connecting two orthogonal members such as the connecting portion between the elbow and the back shell of a cantilever type chair has been described. It can be applied to various parts, parts and products. For example, in the present embodiment, an example of application to the connection between an armrest portion of a cantilever chair having an armrest and a back shell has been mainly described. However, the present embodiment can also be applied to a four-legged pipe chair or a swivel chair. It is applicable to other products. In addition, the connecting part is a fixed pipe leg such as a circle leg or four legs, or a back support rod of the swivel chair and a back shell, a cantilever leg that rises backward from the front end of the leg toward the back shell. Resin shell and frame or other resin products, such as connection with back shell, connection between resin seat shell and seat support frame or back support, or connection between resin seat shell and resin back shell, It can be widely applied to bonding with metal products and ceramic products. That is, it is sufficient that at least one of the two members connected via the metal joint 5 is a resin molded product, but both may be a resin molded product. Further, the joint structure is not limited to the direction or part formed with respect to the resin molded product, and may be arranged to be orthogonal to the back shell as in the embodiment of FIG. It can also be applied to a connection between two members extending in the same direction as the main body of the resin molded product, such as a connection between the back shell and a back support rod extending in the same direction. In the present embodiment, the connection partner member 2 or the pipe 22a as the connection member is inserted into the sheath portion 4 in order to further increase the connection strength. However, the present invention is particularly limited to this. Instead, the tip portion may be connected so as to abut at the open end of the sheath portion 4 without being inserted into the sheath portion 4. Even in this case, the trace of attachment does not appear on the appearance, and it is the same that the decorativeness is excellent. In addition, a cover or an armrest pad 20 that hides the head of the set screw 13 that connects the second mounting portion 5b of the joint member 5 and the connection partner member 2 (pipe 22a) is not used in some cases. Further, in the present embodiment, the case where an attachment screw, particularly a tapping screw, is mainly used for fixing the joint member 5, but the present invention is not particularly limited thereto, and other detachable fixing means is adopted. Needless to say, you can.
[0036]
【The invention's effect】
As is clear from the above description, according to the joint method of the present invention, the metal joint member is fitted and fixed to the dowel, and then the connection partner member is fixed and connected using the joint mounting portion. As a result, the joint member can be easily attached and the connecting mating member can be easily attached, and the working efficiency is good. Further, since the resin molded product and the metal joint member can be separated simply by removing the joint member from the dowel, it is possible to separate and discard the resin molded product and to facilitate the recycling of the resin molded product. In addition, since the connection partner member is connected via the metal joint member held by the dowel and the sheath portion surrounding the dowel, sufficient rigidity and strength can be secured even though the connection structure has no trace of attachment. .
[0037]
Further, according to the joint structure of the present invention, the metal joint member can be assembled only by screwing, so that the work efficiency is good. Further, since the resin molded product and the metal joint member can be separated simply by loosening the mounting screw, it is possible to separate and discard the resin molded product and to facilitate the recycling of the resin molded product. In addition, since the connection partner member is connected via the metal joint member held by the dowel and the sheath portion surrounding the dowel, sufficient rigidity and strength can be secured even though the connection structure has no trace of attachment. .
[0038]
According to the invention described in claim 3, the dowel of the resin molded product and the metal joint member can be fitted and integrated by simply tapping with a tapping screw, and the other member can be attached using a screw. Therefore, the connecting work of two members, for example, the assembling work of each component of the pipe chair becomes easy, and the working efficiency is improved. Moreover, there is no need to insert a female screw member such as a nut or post-processing of the screw hole when molding a resin molded product, and there is no metal on the resin molded product side, so it is effective for waste disposal and recycling Is.
[0039]
According to the fourth aspect of the present invention, since the joint member is naturally engaged at a position corresponding to the anti-rotation portion by simply rotating the joint member while being fitted in the dowel, positioning is easy. In addition, the fixing between the joint member and the connection partner member, for example, screwing, is less likely to shift the screw hole position, and there is little possibility of troublesome assembly or screw tightening or screw failure.
[0040]
Further, according to the chair of the invention described in claim 5, after the metal joint member is fitted to the dowel of the resin back shell and fixed with the mounting screw, the frame such as the leg pipe or the back support rod is made of metal. By simply fitting or assembling into the second mounting part of the joint and fixing it from the back side or the part that can be hidden by the cover, etc., the assembly work of the frame and the back shell is completed and the trace of the mounting is not left in the appearance. . Therefore, the assembling work of the chair is easy and efficient, and the cost can be reduced.
[0041]
According to the chair of the sixth aspect of the present invention, the metal joint member is fitted to the dowel of the resin back shell and fixed with the mounting screw, and then the pipe of the armrest portion of the leg frame is connected to the metal joint. By simply fitting into the second mounting portion and fixing from the back side of the pipe with a screw or the like, the assembly work of the leg frame and the back shell can be completed and the trace of the mounting can be left in the appearance. Therefore, the assembling work of the chair is easy and efficient, and the cost can be reduced.
[0042]
Further, according to the invention described in claim 7, since a relatively soft and weak resin such as polypropylene can be used without using a reinforced resin containing reinforcing fibers such as glass fibers, it is convenient for recycling.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of a joint structure of the present invention.
FIG. 2 is a longitudinal sectional view taken along line II-II of the joint structure of FIG.
FIG. 3 is a transverse sectional view taken along line III-III in FIG.
4 is a cross-sectional view taken along line IV-IV in FIG.
FIG. 5 is a perspective view illustrating an example of a joint member, and a second attachment portion is indicated by an imaginary line.
FIG. 6 is a perspective view showing a partial cross section of an example of a sheath and a dowel in an embodiment in which the joint structure of the present invention is applied to a cantilever type pipe chair.
FIG. 7 is a longitudinal sectional view of a cantilever type pipe chair.
8 is a half plan view showing the relationship between the back shell and the leg frame of the chair of FIG. 7. FIG.
FIG. 9 is a perspective view showing a joint structure between a leg frame and a seat portion of a conventional cantilever type pipe chair.
FIG. 10 is a perspective view showing an external appearance of a cantilever type pipe chair in which a conventional joint structure is applied to a connection between a leg frame and a seat.
[Explanation of symbols]
1 Resin molded product
2 Connection partner
3 Dowels
4 sheath
5 Metal joint members
5a First mounting part
5b Second mounting part
5c seat
5d Hole for mounting screws
6 Tapping screw (Mounting screw)
8 Non-rotating convex
9 Recessed recess
21 Back shell as a resin molded product
22a Pipe composing armrest

Claims

In a joint method for connecting two members, a resin molded product and a connection partner member connected thereto, a dowel projecting toward the connection partner member and a sheath covering the periphery of the resin molded product are integrally formed. And fixing a metal joint member having a cylindrical first attachment portion inserted into the sheath portion and fitted to the dowel and a second attachment portion attached to the connection partner member to the dowel, The resin molded product and the connection partner member are connected by fixing the connection partner member to the second mounting portion of the metal joint member in a state where the tip of the connection partner member is inserted into the sheath portion. How to joint.

In a joint structure for connecting two members, a resin molded product and a connection partner member connected thereto, a dowel projecting toward the connection partner member integrally formed with the resin molded product and a sheath portion covering the periphery thereof And a metal having a cylindrical first attachment portion inserted into the sheath portion and fitted to the dowel, a second attachment portion attached to the connection partner member, and a seat portion in contact with the distal end surface of the dowel A second joint of the metal joint member screwed to the dowel, comprising: a joint member; and an attachment screw that passes through the seat of the joint member and is screwed into the dowel to fix the joint member to the dowel. A joint structure characterized in that the connection partner member having a tip inserted into a sheath portion of the resin molded product is attached to the attachment portion, and the resin molded product and the connection counterpart member are connected.

The joint structure according to claim 2, wherein the mounting screw is a tapping screw and is tapped on the dowel.

3. A convex portion and a concave portion, which are fitted to each other to prevent rotation, are provided on the periphery of the distal end surface of the first mounting portion of the joint member and the root portion of the dowel, respectively. Or the joint structure of 3.

A chair comprising a resin back shell and a frame coupled thereto connected to each other using the joint structure according to claim 2.

The chair according to claim 5, wherein the frame is a pipe constituting an armrest portion.

The frame is folded backward from the upper end of each leg by folding a single pipe, the U-shaped leg support that hits the floor, two legs that rise from the front end of the leg support, and A cantilever type comprising an armrest connected to the back shell and a seat support pipe extending rearward at the seat height of the left and right legs and connected at least at the rear end with a horizontal plate in the width direction. The back shell has a bucket shape including a sheath portion, a standing wall portion, and a bottom portion respectively connected to the armrest portion of the frame by a non-reinforced resin, and the sheath portion of the back shell; The armrest portion of the frame is connected using the joint structure according to any one of claims 2 to 4, and the bottom portion and a rear end of the seat support pipe of the frame are connected. 6. Chair according to fix the plate is intended for mounting said back shell to the frame.