JP3829449B2

JP3829449B2 - Mating member, assembly

Info

Publication number: JP3829449B2
Application number: JP35629597A
Authority: JP
Inventors: 光芳熊本; 文夫栗原; 宗洋三井
Original assignee: JSR Corp
Current assignee: JSR Corp
Priority date: 1997-12-08
Filing date: 1997-12-08
Publication date: 2006-10-04
Anticipated expiration: 2017-12-08
Also published as: JPH11173311A

Description

【０００１】
【発明の属する技術分野】
本発明は、嵌合用の凹部を備えた中空板形状の樹脂成形部材と、該凹部と嵌合される凸部を備えた（樹脂成形）部材と、を嵌合して成る嵌合部材に関する。また、該嵌合部材を少なくとも１箇所に有する組立品（例：屋内や屋外の家具，オフィス家具等）に関する。
【０００２】
【従来の技術】
組立式の本棚、キャビネット、机、書類棚等、種々の組立式の家具等が提供されている。これらの組立式の家具等は、木材、金属、樹脂等の材料から成る各部材を、ネジ等の止め金具を用いて接合することにより組み立てられる。
しかし、木材、金属等の材料から成る組立式の家具等は重いため、組み立て時の取り扱いが困難であり、作業性が悪いという問題がある。このため、軽量な樹脂を主体とする組立式の家具等を提供して欲しいという要望がある。
また、ネジ等の止め金具で各部材を接合すると、接合部分が緩み易いため、ガタツキの原因になり易い。また、ネジ等の締め具合を適正にすることが難しいという問題もある。さらに、ガタツキを無くそうとして締め過ぎると、その部位やネジ山が破壊されてしまうという問題もある。このため、組立後のガタツキを無くして欲しい、ネジ等の止め金具を不要にして欲しいという要望がある。
【０００３】
【発明が解決しようとする課題】
上記の要望に応え得る組立式家具等、即ち、止め金具が不要で、且つ、樹脂を主体とする組立式家具等には、下記の問題がある。
１．止め金具を用いずに２個の部材を接合する構造として、一方の部材に凹部を設け、該凹部に対応する凸部を他方の部材に設けて、両者を嵌合する構造がある。嵌合部の緩みを防止するためには凹部と凸部を寸法精度良く形成する必要があるが、寸法精度の良い凹部と凸部を嵌め合わせる作業は非常に困難であり、ユーザによる組立作業には馴染まない。また、樹脂製の部材に寸法精度の良い凹部と凸部を設けることは、従来の成形技術では非常に困難である。
２．上記事情に鑑み、凹部と凸部に若干の間隙（遊び）を設けておき、凹部と凸部を嵌合した後に間隙に楔を圧入することも考えられるが、樹脂製の部材で凹部と凸部の間隙に楔を圧入すると、楔からの押圧力で凹部と凸部が楔と反対の方向へ押されて変形し、その変形が外観に表れてしまう。このため、外観の重視される製品には不向きである。また、楔が適正に圧入されるようにするためには凹部と凸部を寸法精度良く形成して間隙を適正に設定する必要があるが、上述のように、樹脂製の部材に寸法精度の良い凹部と凸部を設けることは、従来の成形技術では非常に困難である。
本発明は、軽量で、ユーザが容易に組み立てることができ、組立後に緩みやガタツキが無い組立品（組立式家具等）を提供することを目的とする。また、そのために、組立品を構成する部材を嵌合して間隙に楔を圧入しても、楔による変形が組立品の外表面に表れないようにすることを目的とする。
【０００４】
【課題を解決するための手段】
本発明は、下記［１］〜［３］のように構成される。
［１］構成１：
嵌合用の凹部を備えた中空板形状の樹脂成形部材（ａ）と、該凹部と嵌合される凸部を備えた部材（ｂ）と、楔部材（ｃ）とを有し、
前記中空板形状の樹脂成形部材（ａ）の一方の板面には底面部に肉盛部が形成され且つ長手方向両端の側面部に孔が設けられた溝が形成されており、該孔の一方に棒材の一端を係止して押し下げて上記肉盛部を押圧した状態で該棒材の他端を他方の孔に挿入することにより上記底面部の内表面が他方の板面の内表面に密着されて成り、
上記樹脂成形部材（ａ）の嵌合用の凹部と上記部材（ｂ）の凸部が嵌合されるとともに該嵌合用の凹部の内壁と該凸部の外壁との間に上記楔部材（ｃ）が介在されることを特徴とする嵌合部材。
上記樹脂成形部材（ａ）の凹部と上記部材（ｂ）の凸部を嵌合した後に、上記楔部材（ｃ）を上記凹部の内壁と上記凸部の外壁との間に嵌め入れることで、該内壁と該外壁との間に上記楔部材（ｃ）を介在させてもよい。また、上記樹脂成形部材（ａ）の凹部の内壁又は上記部材（ｂ）の凸部の外壁の何れかに上記楔部材（ｃ）を設けた状態で、上記凹部と上記凸部を嵌合することにより、上記内壁と上記外壁との間に上記楔部材（ｃ）を介在させてもよい。このことは、下記構成２でも同様である。
上記嵌合の様子を図１に示す。その詳細については後述する。
［２］構成２：
構成１に於いて、
前記中空板形状の樹脂成形部材（ａ）と凸部を備えた部材（ｂ）は、熱容量の小さな板材で構成された成形面の背後の空間内に加熱／冷却流体を供給／排出可能であり且つ複数個に分割可能である各ブロックがパリソンに対して接近／離隔可能に設けられた上型と、熱容量の小さな板材で構成された成形面の背後の空間内に加熱／冷却流体を供給／排出可能であり前記上型との間で成形用空間を構成する下型を備えたブロー成形用金型を用い、前記下型の上部にパリソンの下端部をピンチした後、ダイから垂下されるパリソンの後続部が前記下型の成形面側面を覆うように該後続部を該成形面側面に対して相対移動させるとともに、前記上型の各ブロックを合体させることにより、嵌合用の凹部／凸部を有するように成形されて成る、
ことを特徴とする嵌合部材。
［３］構成３：
構成１又は構成２に記載の嵌合部材を少なくとも１箇所に有することを特徴とする組立品。
このように、本発明の構成１〜構成３は、楔による変形が樹脂成形部材（ａ）の中空により吸収されて楔や部材（ｂ）の凸部に接触する部位に止まる結果、外表面には楔に押された突出部が現れない嵌合構造を有する。
樹脂成形部材（ａ）の材料としては、好ましくは熱可塑性樹脂である。熱可塑性樹脂を樹脂成形部材（ａ）に用いる場合の成形法としては、好ましくはブロー成形法、真空成形法であり、更に好ましくはブロー成形法であり、特に好ましくは高転写ブロー成形法である。高転写ブロー成形法とは、金型成形面の転写性を通常のブロー成形法よりも高めたブロー成形法であり、金型成形面を加熱することによって達成される。
部材（ｂ）の材料としては、樹脂（構成２参照）、木材、金属等が挙げられる。好ましくは熱可塑性樹脂である。部材（ｂ）を熱可塑性樹脂で構成する場合、その成形法としては、射出成形法、押出成形法、ブロー成形法、真空成形法等が挙げられる。好ましくはブロー成形法、更に好ましくは高転写ブロー成形法である。部材（ｂ）は、中空形状であってもよく、中空形状でなくてもよいが、好ましくは中空形状である。
【０００５】
樹脂成形部材（ａ）を高転写ブロー成形法で成形する場合には、金型成形面の温度を材料樹脂のビカット軟化温度（Ｔ）℃以上に加熱して、溶融樹脂（パリソン）が成形面に密着されるようにする。ビカット軟化温度（Ｔ）℃以上への昇温は予熱によって行ってもよく、また、パリソンの外表面をブロー圧力で成形面に接触させる際に加熱してもよい。好ましくは予熱である。
樹脂成形部材（ａ）の成形に適した金型は、
（１）成形面を材料樹脂のビカット軟化温度（Ｔ）℃以上に加熱する機能を必須の機能として備え、好ましくは上記温度に予熱する機能を備え、
（２）成形サイクルを短縮する見地から、望ましくは、成形面の転写後に成形面を速やかに冷却する機能を備え、好ましくは（ビカット軟化温度（Ｔ）−１０）℃に速やかに冷却する機能を備え、
（３）中空（２重壁構造）の部材を、望ましくは、均一な肉厚分布となるように成形する機能を備え、好ましくは複雑な形状であっても中空に成形できる機能を備え、
（４）嵌合用の凹部や凸部等を持つ種々の形状の部材を成形できるように、望ましくは、十分に深い２重壁構造の深絞り成形品を成形する機能を備え、
ていることが望まれる。
なお、上記の各機能は、部材（ｂ）を樹脂で構成する場合（構成２参照）に、該部材（ｂ）の成形に適した金型の機能でもある。
【０００６】
上記（１）の加熱機能と（２）の冷却機能とは、成形面を熱容量の小さな金属等の薄い板材で構成するとともに、その背後に空間を設け、該空間内に加熱流体や冷却流体を供給し／排出するように構成することで実現可能である。
上記（３）と（４）の機能（望ましい機能）は、分割可能な複数個のブロックを有し、各ブロックがパリソンに対して接近し、及び遠ざかるように移動可能に設けられた上型と、該上型との間で成形用空間を構成する下型と、を備え、ダイから垂下される下端部をピンチされたパリソンの後続部を、前記成形用空間に面する前記下型の側面を覆うように該側面に対して相対移動させる機能を備えたブロー成形用金型を用いることにより実現可能である。
例えば、分割可能な複数個のブロックを有し、各ブロックがパリソンに対して接近し、及び遠ざかるように移動可能に設けられ、各ブロックが合体した状態で下方が開放された中空構造を成す上型と、上部にパリソンの下端部を固定するためのピンチ部材を有し、前記上型の中空内に位置することにより該上型との間で成形用空間を構成する下型と、を備え、ダイから垂下したパリソンの下端部を前記ピンチ部材に固定し、パリソンの後続部を前記下型の側面に沿うように垂下させ、前記各ブロックを合体させることにより前記成形用空間を構成してパリソンを成形する、成形用金型、を用いることにより実現可能である。
また、分割可能な複数個のブロックを有し、各ブロックがパリソンに対して接近し、及び遠ざかるように移動可能に設けられ、各ブロックが合体した状態で下方が開放された中空構造を成す上型と、上部にパリソンの下端部を固定するためのピンチ部材を有し、上下移動可能に設けられ、ホームポジションから上昇して前記上型の中空内に位置することにより該上型との間で成形用空間を構成する下型と、を備え、ダイから垂下したパリソンの下端部をホームポジションに在る前記下型のピンチ部材に固定し、前記各ブロックを合体させることによりパリソンの上端部をピンチし、前記下型を上昇させることによりパリソンの後続部を該下型の側面に沿うように上昇させて該下型を前記中空内に位置させることにより前記成形用空間を構成してパリソンを成形する、成形用金型、を用いることによっても実現可能である。
上記（１）〜（４）の機能を実現する具体的構成例については後述する。
【０００７】
本発明の組立品としては、例えば、キャビネット、机、本棚、書類棚、ファイル等の収納ボックス、倉庫用等の荷物棚、簡易トイレ、簡易更衣室、収納ボックスを兼ねたベンチ等がある。つまり、キャビネットの側部と天板の接合部や側部と底板の接合部、机の脚と天板との接合部、本棚の棚板と側板との接合部、書類棚の棚板と側板との接合部、ファイル等の収納ボックスの側板と天板の接合部や側板と底板の接合部、倉庫用等の荷物棚の棚板と側板との接合部等に、本発明の嵌合構造を採用できる。
凹部を有する樹脂成形部材（ａ）の材料や、凸部を有する部材（ｂ）を樹脂で構成した場合の材料として好ましく用いられるものは、例えば、ＡＳ樹脂、ポリスチレン、ハイインパクトポリスチレン、アクリロニトリル−ブタジエン系ゴム−スチレンから成るグラフト共重合体（ＡＢＳ樹脂）、アクリロニトリル−ブタジエン系ゴム−スチレン−αメチルスチレンから成るグラフト共重合体（耐熱ＡＢＳ樹脂）、アクリロニトリル−エチレン−プロピレン系ゴム−スチレン及び／又はメタクリル酸メチルから成るグラフト共重合体（ＡＥＳ樹脂）、アクリロニトリル−水添ジエン系ゴム−スチレン及び／又はメタクリル酸メチルから成るグラフト共重合体、アクリロニトリル−シリコーンゴム−スチレン及び／又はメタクリル酸メチルから成るグラフト共重合体、ポリエチレン、ポリプロピレン、ポリカ−ボネ−ト、ポリフェニレンエ−テル、ポリオキシメチレン、ナイロン、メタクリル酸メチル系重合体、ポリエ−テルスルホン、ポリアリレ−ト、塩化ビニル系樹脂、マレイミド化合物−スチレン及び／又はアクリロニトリル及び／又はα−メチルスチレンからなる共重合体、ゴム状重合体−マレイミド化合物−スチレン及び／又はアクリロニトリル及び／又はメタクリル酸メチル及び／又はα−メチルスチレンからなるグラフト共重合体等、及びこれらの複合物と、これらに充填剤を添加した樹脂を用いることができる。なお、これらは例示であり、これら以外の樹脂も好適に用いることができる。
【０００８】
【発明の実施の形態】
１．嵌合と楔部材（ｃ）の介在による一体化構造．
請求項の樹脂成形部材（ａ）の凹部と部材（ｂ）の凸部が嵌合されるとともに該凹部の内壁と該凸部の外壁の間に楔部材（ｃ）が介在されることによって実現される一体化構造を、図１を参照して説明する。
図１は、天板61と側板65を一体化する例を示す。天板61とは、例えば、机の天板、本棚の棚板、荷物棚の棚板等である。側板とは、例えば、机の袖部を構成する板、本棚の側板（支持板）、荷物棚の側板（支持板）等である。なお、図１では板部材と板部材を一体化する例が示されているが、板部材と棒部材、棒部材と棒部材を一体化する場合も、同様に構成することができる。つまり、凹部と凸部が嵌め合わされているとともに凹部の内壁と凸部の外壁の間に楔が介在されている一体化構造を用いて、板部材と棒部材、棒部材と棒部材を強固に結合するように構成することができる。
図１（ａ）には、天板61の一端部（図中左端部）下面側の凹部（線状の溝）61b 内に、側板65の上端部の凸部（線状の突出部）65b を嵌め入れて、両者を一体化する例が示されている。この構造は、同図（ｂ）の上段に示すように天板61の凹部61b 内に側板65の凸部65b を嵌め入れた後、同図（ｂ）の下段に示すように両者の間隙に楔69を打ち込む（圧入する）ことで構成される。このように楔69を打ち込むと、図内に矢印で示すように、天板61の凹部61b は楔69に押されて両側方向へ拡がるように変形して、天板61と側板65とが強固に結合されて一体化される。一方、天板61は中空の２重壁構造に形成されているため、凹部61b と、人間の眼にふれる外表面61a とは離されている。このため、上記の変形は楔69や側板65の凸部65b に直接的に接触する部位に止まり、外表面61a には変形は伝わらない。つまり、外表面61a は、変形の無い綺麗な外観のままである。
なお、上記では、天板61の凹部61b 内に側板65の凸部65b を嵌め入れた後に両者の間隙に楔69を打ち込む（圧入する）という手順で一体化構造が構成されているが、本発明はこのような手順での組立に限定されない。例えば、天板61の凹部61b 又は側板65の凸部65b に楔69を別体又は一体に設けておき、その状態で、天板61の凹部61b と側板65の凸部65b を嵌合することにより、上記の一体化構造を構成してもよい。
このように、図１には、凹部を備えた中空形状の樹脂成形部材（ａ）と、該凹部と嵌合される凸部を備えた部材（ｂ）と、楔部材（ｃ）とを有し、
上記樹脂成形部材（ａ）の凹部と上記部材（ｂ）の凸部が嵌合されるとともに該凹部の内壁と該凸部の外壁との間に上記楔部材（ｃ）が介在されることにより一体化され、該楔部材（ｃ）の介在による上記樹脂成形部材（ａ）の変形がその中空により吸収されて該楔部材（ｃ）又は上記部材（ｂ）の凸部に接触する部位に止まることを特徴とする嵌合部材が示されている。また、この嵌合部材を各種の組立品の構成要素として用い得ることが示されている。
なお、楔69や側板65の材質として、天板61と同じ材質を用いると、リサイクル時に纏めて処理することができるという効果がある。
【０００９】
２．金型の構造．
次に、上述の部材（中空の２重壁構造・嵌合用の凹部61b や凸部65b 等の複雑な形状・良好な表面外観・嵌合対象の凹部61b と凸部65b に適正な間隙を設定できる良好な寸法精度・均一な肉厚，という特徴を備えた部材（ａ）（ｂ））の成形に適したブロー成形用の金型について説明する。なお、金型の成形面は、当然ながら成形対象の部材に対応する形状に構成されているが、図では、説明を簡略化するため、単純な形状の成形面が描かれている。
成形用金型．
図２は成形用金型を模式的に示す断面図である。
図示の成形用金型は、上型（第１型，雌型）2 と、下型（第２型，雄型）1 とを有する。
上型2 は、分割可能な複数個（本例では２個）のブロック2a,2b を有し、各ブロック2a,2b が、上方から鉛直に垂下されるパリソン90（図３等参照）に対して接近することができ、且つ、遠ざかることができるように、水平移動可能に設けられている。各ブロック2a,2b が合体した状態では、下方が開放された円筒形状の中空部を有し、その内表面が成形面の一部（深絞り形状の成形品の外周面と底外面用の成形面）となる。成形面の一部を成す内表面は、熱容量の小さな薄い金属板23a,23b で構成されており、その背後には空間2S,2S が設けられている。この空間2S,2S は、金属板23a,23b が断熱材25a,25b を介して本体21a,21b に支持されていることにより確保されている。本体21a,21b は背後の取付板29a,29b を介して不図示の型締装置に取り付けられており、該型締装置の動作により、各ブロック2a,2b は、上方から垂下されるパリソン90に対して接近し、又は、遠ざかるように動作する。また、前記空間2S,2S 内には、加熱用の加熱流体や冷却用の冷却流体が供給／排出されるように構成されており、これにより、金属板23a,23b を速やかに所望の温度に加熱／冷却することが可能となる。
下型1 は、上端面の略中央部にパリソン90の先端（下端）部を固定するためのピンチ部材であるシャッター機構（カメラのシャッタ−機構と同様の機能を持つ機構）17を有し、上型2 の中空内に位置した状態に於いて該上型2 の内表面との間で成形用空間を構成する。この下型1 の外周面と上端面と下端部上面が成形面の一部（深絞り形状の成形品の内周面と底内面と縁面用の成形面）となる。成形面の一部を成す外周面と上端面と下端部上面は、熱容量の小さな薄い金属板13で構成されており、その背後には空間1Sが設けられている。この空間1Sは、金属板13が断熱材15を介して本体11に支持されていることにより確保されている。本体11は背後の取付板19を介して不図示の型締装置に取り付けられており、該型締装置の動作により、下型1 は、ホームポジションから上昇して上死点（最上位置）に到り、又は、上死点から下降して下死点（最下位置）であるホームポジションに到るように動作する。また、前記空間1S内には、加熱用の加熱流体や冷却用の冷却流体が供給／排出されるように構成されており、これにより、金属板13を速やかに所望の温度に加熱／冷却することが可能となる。
【００１０】
３．ブロー成形過程．
次に、上記構成の成形用金型を用いたブロー成形過程について説明する。
３−１．上型移動の場合.
まず、ダイ52（図３）から垂下したパリソン90の下端部をシャッター機構17により固定し（図３（ａ））、パリソン90の後続部を下型1 の側面に沿うように垂下させ（図３（ｂ））、上型2 の各ブロック2a,2b を接近させて合体させる（図４（ａ）〜（ｂ））ことにより成形用空間を構成し、パリソン外表面を加熱した成形面に押圧して十分に密着させることで成形面を転写し（図５（ａ））、冷却して固化させた後、取り出す（図５（ｂ））。
３−２．下型移動の場合．
図２〜図５には上型2 を接近させて合体させることにより成形空間を構成する金型が示されているが、このような金型に代えて、下型を上昇させることにより成形空間を構成する金型を用いる場合には、ダイから垂下したパリソンの下端部をホームポジションに在る下型のシャッター機構により固定し、上型の各ブロックを接近させて合体させることによりパリソンの上端部をピンチし、下型を上昇させることによりパリソンの後続部を下型の側面に沿うように上昇させて下型を上型の中空内に位置させることにより成形用空間を構成し、パリソン外表面を加熱した成形面に押圧して十分に密着させることにより成形面を転写し、冷却して固化させた後に取り出す。
【００１１】
４．成形過程の具体例（図３〜図５）．
通常のブロ−成形機（ＩＰＢ−５５ＥＰＬ：石川島播磨重工（株）社製）と通常のブロ−成形用ＡＢＳ樹脂（＃８８Ｋ４：テクノポリマー（株）社製）を用いて、成形を実施した。
まず、上型2 を開いた状態で、下型1 を最上位置（図３（ａ）に示す上死点の位置）に設定した後、パリソン90を吐出して鉛直に垂下させ、パリソン90の先端部（下端部）が下型1 の上端面に達すると（図３（ａ））、シャッター機構17によってパリソン90の下端をピンチして下型1 の上面に固定した。
続いて、不図示のプリブロー機構によりパリソン内の圧力を２Ｋｇ／ｃｍ² 〜３Ｋｇ／ｃｍ² の範囲に保った状態で、連続して吐出した。これにより、パリソン90は折れ曲がりながら下型1 を覆うようにして下降した。パリソン90の折れ曲がった先端が下型1 の下端縁部付近に到達した時点でパリソン90の吐出を終了して、上型2 の型締めを開始した（図３（ｂ））。
型締め動作の途中では、パリソン90が型に押されて変形するため、パリソン90の内部圧力が上昇しようとするが、この内部圧力が前述の圧力範囲内に留まるように、不図示のプリブロ−機構を用いて制御した（図４（ａ））。
型閉め完了後、上述のプリブローで使用した吹き込み針を用いて、６Ｋｇ／ｃｍ² の圧力までパリソン90a の内部を加圧して、パリソン外表面を成形面へ押し付けた（図４（ｂ））。また、空間2S,2S,1S内へ加熱流体を供給することにより上記押し付け時の成形面の表面温度が１３０℃となるように制御した後、上記加熱流体を空間2S,2S,1S内から排出して、２５℃の冷却水を空間2S,2S,1S内へ噴出させて成形品91を冷却した（図５（ａ））。
冷却終了後、上型2 を開き、下型1 を取付板19操作者側（例えば、図示の手前側）へ４５度傾斜させて、成形品91を取り出した（図５（ｂ））。
なお、上記では、成形品91の重量が９３０ｇ〜９７０ｇの範囲に入るようにパリソン吐出条件を設定している。
このようにして、前述の特徴（中空の２重壁構造・嵌合用の凹部61b や凸部65b 等の複雑な形状・良好な表面外観・嵌合対象の凹部61b と凸部65b に適正な間隙を設定できる良好な寸法精度・均一な肉厚）を備えた本発明の組立品の構成部材を成形することができる。
【００１２】
５．上記成形方法により成形される部材の特徴．
上述のように成形される樹脂成形部材は、本発明の効果に加えて、さらに下記の効果を奏する。
１．射出成形法ではなくブロー成形法により成形しているため、大型の部材であっても低コストで成形することができる。したがって、大型の家具等の部材であっても提供することができる。
２．射出成形法ではなくブロー成形法により成形しているため、金型構造を複雑化させることなく中空構造の部材を比較的容易に成形することができる。このため、中空構造により軽量化の度合いを向上させることが容易である。
３．通常のブロー成形法ではなく成形面を加熱することでパリソン外表面を成形面に密着させる高転写ブロー生成法により成形しているため、外観を重視される製品用途に用いることができる。
４．通常のブロー成形法ではなく成形面を加熱することでパリソン外表面を成形面に密着させる高転写ブロー生成法により成形しているため、嵌合される凹部と凸部を寸法精度良く形成することができ、楔の圧入用の間隙を適正に設定することができる。また、外観寸法も精度良く構成できるため、組立後のガタツキもなく、ガタツキが許容されない製品用途にも用いることができる。
５．図２に示すような金型（上型と下型から成る金型）を用いて成形しているため、凹部や凸部のような複雑な形状を有する部材であっても、ヒケ等の無い良好な寸法精度で成形することができる。なお、従来の金型でアンダーカット構造を成形する場合、金型構造が非常に複雑となって非常にコスト高となるばかりでなく、部位によってはアンダーカット構造を形成不可能な部位もある。
【００１３】
６．天板61等の板部材の補強構造．
次に、図６〜図７を参照して、中空の樹脂製板部材610 （前述の天板61や側板65等に相当する部材）を補強する構造について説明する。図６は板部材610 の斜視図、図７は溝610cの長手方向の端面図である。
図６に示すように、樹脂製板部材610 の裏面（図中の上面）には、前述の凸部と嵌合されるべき凹部610bの他に、２本の溝610cが板部材610 の長手方向に形成されている。溝610cの深さは、図７に示すように、溝の底面部が板部材610 の表面部に接触しないギリギリの深さである。また、溝610c内の底面には肉盛部610dが形成されている。また、溝610cの両端部には、下記アルミパイプAPの径に対応するサイズのピン孔（ブローピン孔，内部冷却用の孔）PHが、各々設けられている。なお、溝の本数は板部材610 のサイズや形状、或いは達成したい強度等に応じて適宜に変更できる。
補強は、図７（ｂ）（ｃ）に示すように行われる。即ち、溝610cの一端のピン孔PHにアルミパイプAPの先端APS を貫入し、図示矢印のようにアルミパイプAPを押し下げてアルミパイプAPの側面で肉盛部610dを押圧し、アルミパイプAPを後退させて先端APS の出っ張り部をピン孔PHに係止させるとともに後端部を他端側のピン孔PHに貫入する。これにより、アルミパイプAPが溝610c内に固定され、該アルミパイプAPの側面で肉盛部610dが押圧される。
このように、アルミパイプAPの側面で肉盛部610dが押圧される結果、溝610cの底面部が板部材610 の表面部に密着し（図では両者の間隙が示されているが実際はアルミパイプAPを取り付けることにより密着状態となる）、表裏間が中空であることに起因するペコペコ感や振動時のビビリが無くなる。即ち、アルミパイプAPを取り付けるという簡易な作業（ユーザが容易に行い得る作業）により、板材610 に対して、板面に垂直な方向の集中荷重に耐え得る剛性を付与することができる。なお、溝610cの底面部と板部材610 の表面部とを成形時に密着させた場合には、表面外観にヒケが発生するという不具合が生じてしまう。
なお、上述の例では凹部610bを備えた部材について述べたが、前述の凸部（嵌合用の凸部）を備えた樹脂製板部材にも同様に適用できる。また、凹部や凸部は嵌合を目的とするものであるため、嵌合を目的としない樹脂製板部材（単品の板部材等）を補強する場合には、当然ながら凹部や凸部は必須ではない。
また、上述の例では溝610c内に１本のアルミパイプを組み付ける例が示されているが、板部材610 のサイズや形状、或いは達成したい強度等に応じて溝610c内に組み付けるアルミパイプの本数を適宜に変更してよい。
また、上述の例では補強材としてアルミパイプを用いているが、補強材の材質としては、アルミや鉄等の金属類、木材、集成材、樹脂、繊維強化樹脂等が挙げられる。形状は、パイプ、棒、板等が挙げられる。
【００１４】
【発明の効果】
本発明によると、軽量で、ユーザが容易に組み立てることができ、組立後に緩みやガタツキが無い組立品（組立式家具等）を提供することができる。また、その組立品の外観を良好にするために、組立品を構成する部材を嵌合して間隙に楔を圧入しても、楔による変形が組立品の外表面に表れないようにできる。更に、剛性の高い嵌合部材を提供することができる効果がある。
本発明の構成２や構成２を引用する構成３によると、前記効果に加えて、更に、寸法精度の良い樹脂成形品から成る嵌合部材や組立品を提供することができる効果がある。
【図面の簡単な説明】
【図１】本発明の組立品を構成する部材を接合する嵌合構造の説明図であり、（ａ）は接合対象の天板と側板を模式的に示す斜視図、（ｂ）は接合部の断面構造を模式的に示す説明図。
【図２】本発明の組立品を構成する部材を成形する金型の断面模式図。
【図３】図２の金型による製造過程の説明図。
【図４】図２の金型による製造過程の図３の続きの説明図。
【図５】図２の金型による製造過程の図４の続きの説明図。
【図６】本発明の組立品の部材の一例である天板の斜視図。
【図７】図６の天板の補強部（溝部）の断面模式図であり、（ａ）はブローピンを突き刺した状態、（ｂ）はピン孔に補強用パイプの先端を貫入させた状態、（ｃ）は補強用パイプの後端を反対側のピン孔に嵌入させた状態を示す。
【符号の説明】
１下型
２ａ，２ｂ上型
６１天板
６５側板
９０パリソン
９１成型品
ＡＰアルミパイプ[0001]
BACKGROUND OF THE INVENTION
  The present invention includes a recess for fitting.InsideEmpty plate shapeTreeThe present invention relates to a fitting member formed by fitting a grease-molded member and a (resin-molded) member provided with a convex portion fitted to the concave portion. The present invention also relates to an assembly (eg, indoor or outdoor furniture, office furniture, etc.) having the fitting member in at least one place.
[0002]
[Prior art]
Various assembling-type furniture such as assembling-type bookshelves, cabinets, desks, and document shelves are provided. These assembling-type furniture and the like are assembled by joining members made of materials such as wood, metal, and resin by using fasteners such as screws.
However, assembling-type furniture made of materials such as wood and metal is heavy, it is difficult to handle during assembly, and there is a problem that workability is poor. For this reason, there is a demand for providing assembling-type furniture mainly composed of lightweight resin.
Further, if each member is joined with a fastener such as a screw, the joined portion is likely to loosen, which is likely to cause backlash. In addition, there is a problem that it is difficult to properly tighten screws and the like. Furthermore, there is also a problem that, if it is overtightened to eliminate rattling, the part and the screw thread are destroyed. For this reason, there is a desire to eliminate rattling after assembly and to eliminate the need for fasteners such as screws.
[0003]
[Problems to be solved by the invention]
Assembly-type furniture that can meet the above-described demands, that is, assembly-type furniture that does not require a fastener and is mainly made of resin, has the following problems.
1. As a structure for joining two members without using a metal fitting, there is a structure in which a concave portion is provided in one member, a convex portion corresponding to the concave portion is provided in the other member, and both are fitted. In order to prevent loosening of the fitting part, it is necessary to form the concave part and the convex part with high dimensional accuracy, but it is very difficult to fit the concave part and convex part with good dimensional accuracy, and it is difficult for the assembly work by the user. Is not familiar. In addition, it is very difficult to provide concave portions and convex portions with good dimensional accuracy in a resin member using conventional molding techniques.
2. In view of the above circumstances, it is conceivable to provide a slight gap (play) between the concave and convex portions, and press the wedge into the gap after fitting the concave and convex portions. When the wedge is press-fitted into the gap between the portions, the concave portion and the convex portion are pushed in the direction opposite to the wedge by the pressing force from the wedge, and the deformation appears in the appearance. For this reason, it is not suitable for a product whose appearance is important. In addition, in order to properly press-fit the wedge, it is necessary to form the concave and convex portions with good dimensional accuracy and to set the gap appropriately. Providing good concave and convex portions is very difficult with conventional molding techniques.
An object of the present invention is to provide an assembly (such as assembly-type furniture) that is lightweight, can be easily assembled by a user, and has no looseness or rattling after assembly. It is another object of the present invention to prevent deformation caused by the wedge from appearing on the outer surface of the assembly even when members constituting the assembly are fitted and a wedge is press-fitted into the gap.
[0004]
[Means for Solving the Problems]
  The present invention provides the following [1] to [3] Is configured.
[1] Configuration 1:
  A hollow plate-shaped resin molded member (a) provided with a concave portion for fitting, a member (b) provided with a convex portion fitted to the concave portion, and a wedge member (c),
  One plate surface of the hollow plate-shaped resin molded member (a) has a groove formed with a built-up portion on the bottom surface and holes on both side surfaces in the longitudinal direction. One end of the bar is locked and pushed down to the other side, and the other end of the bar is inserted into the other hole in a state where the build-up part is pressed, so that the inner surface of the bottom part is the inner side of the other plate. It is in close contact with the surface,
  The wedge member (c) is fitted between the fitting concave portion of the resin molded member (a) and the convex portion of the member (b) and between the inner wall of the concave portion for fitting and the outer wall of the convex portion. The fitting member characterized by the above-mentioned.
  After fitting the concave portion of the resin molded member (a) and the convex portion of the member (b), the wedge member (c) is fitted between the inner wall of the concave portion and the outer wall of the convex portion, The wedge member (c) may be interposed between the inner wall and the outer wall. Moreover, the said recessed part and the said convex part are fitted in the state which provided the said wedge member (c) in either the inner wall of the recessed part of the said resin molding member (a), or the outer wall of the convex part of the said member (b). Thus, the wedge member (c) may be interposed between the inner wall and the outer wall. The same applies to the following configuration 2.
  The state of the fitting is shown in FIG. Details thereof will be described later.
[2] Configuration 2:
  In configuration 1,
  SaidHollow plate shapeResin molded member (a) andMember with convex part(B) is a block in which heating / cooling fluid can be supplied / discharged into a space behind a molding surface made of a plate material having a small heat capacity and can be divided into a plurality of blocks. A heating / cooling fluid can be supplied / discharged in a space behind a molding surface composed of a plate material having a small heat capacity and a molding space between the upper die and the upper die. Using a blow molding die provided with a mold, pinch the lower end of the parison to the upper part of the lower mold, and then the subsequent part of the parison hanging from the die covers the side of the molding surface of the lower mold The part is moved relative to the side surface of the molding surface and the blocks of the upper mold are combined to form a concave / convex part for fitting.The
  The fitting member characterized by the above-mentioned.
[3] Configuration 3:
  An assembly comprising the fitting member according to Configuration 1 or Configuration 2 in at least one place.
  Thus, in the first to third aspects of the present invention, the deformation due to the wedge is absorbed by the hollow of the resin-molded member (a) and stops at the portion that contacts the convex portion of the wedge or the member (b). Has a fitting structure in which the protrusion pushed by the wedge does not appear.
  The material of the resin molded member (a) is preferably a thermoplastic resin. As a molding method when a thermoplastic resin is used for the resin molded member (a), a blow molding method or a vacuum molding method is preferable, a blow molding method is more preferable, and a high transfer blow molding method is particularly preferable. . The high transfer blow molding method is a blow molding method in which the transferability of the mold molding surface is higher than that of a normal blow molding method, and is achieved by heating the mold molding surface.
  Examples of the material of the member (b) include resin (see Configuration 2), wood, metal, and the like. A thermoplastic resin is preferable. When the member (b) is made of a thermoplastic resin, examples of the molding method include an injection molding method, an extrusion molding method, a blow molding method, and a vacuum molding method. A blow molding method is preferred, and a high transfer blow molding method is more preferred. The member (b) may have a hollow shape or may not have a hollow shape, but preferably has a hollow shape.
[0005]
  When the resin molding member (a) is molded by the high transfer blow molding method, the temperature of the mold molding surface is heated to the Vicat softening temperature (T) ° C. or higher of the material resin so that the molten resin (parison) is formed on the molding surface. To be in close contact with the The temperature of the Vicat softening temperature (T) ° C. or higher may be increased by preheating, or may be heated when the outer surface of the parison is brought into contact with the molding surface with a blow pressure. Preheating is preferable.
  A mold suitable for molding the resin molded member (a) is:
  (1) A function of heating the molding surface to the Vicat softening temperature (T) ° C. or higher of the material resin as an essential function, preferably a function of preheating to the above temperature,
  (2) From the viewpoint of shortening the molding cycle, desirably, it has a function of quickly cooling the molding surface after transfer of the molding surface, preferably a function of rapidly cooling to (Vicat softening temperature (T) -10) ° C. Prepared,
  (3) A hollow (double wall structure) member is desirably provided with a function of forming a uniform thickness distribution, and preferably provided with a function of forming a hollow shape even in a complicated shape.
  (4) It is desirable to have a function of forming a deep-drawn molded product having a sufficiently deep double wall structure so that various shapes of members having concave and convex portions for fitting can be formed.
  It is hoped that
  In addition, each said function is a case where member (b) is comprised with resin.(See Configuration 2)Furthermore, it is also a function of a mold suitable for forming the member (b).
[0006]
In the heating function (1) and the cooling function (2), the molding surface is formed of a thin plate material such as a metal having a small heat capacity, a space is provided behind the molding surface, and heating fluid and cooling fluid are provided in the space. This can be realized by configuring to supply / discharge.
The above functions (3) and (4) (desired functions) include a plurality of blocks that can be divided, and an upper die that is movably provided so that each block approaches and moves away from the parison. A lower mold that forms a molding space with the upper mold, and a side portion of the lower mold that faces a rear portion of the parison pinched at a lower end portion suspended from the die and facing the molding space. This can be realized by using a blow molding die having a function of moving relative to the side surface so as to cover the surface.
For example, it has a plurality of blocks that can be divided, each block is provided so as to move toward and away from the parison, and a hollow structure in which the lower part is opened in a state where the blocks are combined is formed. A mold and a lower mold that has a pinch member for fixing the lower end of the parison on the upper part and forms a molding space with the upper mold by being positioned in the hollow of the upper mold The lower end of the parison hanging from the die is fixed to the pinch member, the trailing portion of the parison is hung along the side of the lower mold, and the blocks are combined to form the molding space. This can be realized by using a mold for molding a parison.
In addition, it has a plurality of blocks that can be divided, and each block is provided so as to be movable toward and away from the parison. It has a mold and a pinch member for fixing the lower end of the parison on the upper part, is provided so as to be movable up and down, and rises from the home position and is located in the hollow of the upper mold so that it is between the upper mold A lower mold that constitutes a molding space, and a lower end of the parison hanging from the die is fixed to the pinch member of the lower mold at the home position, and the upper ends of the parison are assembled by combining the blocks. The molding space is configured by raising the lower mold by raising the trailing part of the parison along the side surface of the lower mold and positioning the lower mold in the hollow. Molding a parison mold, it can be also realized by use of.
A specific configuration example for realizing the functions (1) to (4) will be described later.
[0007]
Examples of the assembly of the present invention include cabinets, desks, bookshelves, document shelves, storage boxes for files, luggage racks for warehouses, simple toilets, simple changing rooms, benches that also serve as storage boxes, and the like. That is, the junction between the side and top of the cabinet, the junction between the side and the bottom, the junction between the desk leg and the top, the junction between the book shelf and the side plate, the shelf and the side plate of the document shelf Fitting structure of the present invention, such as a joint portion between a storage plate such as a file, a joint portion between a side plate and a top plate of a storage box, a joint portion between a side plate and a bottom plate, a joint portion between a shelf plate and a side plate of a luggage rack for warehouses, etc. Can be adopted.
For example, AS resin, polystyrene, high impact polystyrene, acrylonitrile-butadiene may be preferably used as the material of the resin molded member (a) having the concave portion and the material when the member (b) having the convex portion is made of resin. Rubber-styrene graft copolymer (ABS resin), acrylonitrile-butadiene rubber-styrene-α-methylstyrene graft copolymer (heat-resistant ABS resin), acrylonitrile-ethylene-propylene rubber-styrene and / or Graft copolymer consisting of methyl methacrylate (AES resin), acrylonitrile-hydrogenated diene rubber-styrene and / or graft copolymer consisting of methyl methacrylate, acrylonitrile-silicone rubber-styrene and / or methyl methacrylate. Graft copolymer, polyethylene, polypropylene, polycarbonate, polyphenylene ether, polyoxymethylene, nylon, methyl methacrylate polymer, polyethersulfone, polyarylate, vinyl chloride resin, maleimide compound-styrene And / or a copolymer made of acrylonitrile and / or α-methylstyrene, a rubbery polymer-maleimide compound, a graft copolymer made of styrene and / or acrylonitrile and / or methyl methacrylate and / or α-methylstyrene, etc. , And a composite thereof, and a resin to which a filler is added can be used. These are merely examples, and resins other than these can also be suitably used.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
1. Integrated structure with interposition of fitting and wedge member (c).
The concave portion of the resin molded member (a) and the convex portion of the member (b) are fitted together, and the wedge member (c) is interposed between the inner wall of the concave portion and the outer wall of the convex portion. The integrated structure to be performed will be described with reference to FIG.
FIG. 1 shows an example in which the top plate 61 and the side plate 65 are integrated. The top plate 61 is, for example, a desk top plate, a book shelf shelf, a luggage shelf shelf, or the like. Examples of the side plate include a plate constituting a sleeve portion of a desk, a side plate (support plate) of a bookshelf, and a side plate (support plate) of a luggage shelf. In addition, although the example which integrates a plate member and a plate member is shown in FIG. 1, when integrating a plate member and a bar member, and a bar member and a bar member, it can comprise similarly. In other words, the plate member and the bar member, and the bar member and the bar member are strengthened using an integrated structure in which the concave portion and the convex portion are fitted together and a wedge is interposed between the inner wall of the concave portion and the outer wall of the convex portion. Can be configured to combine.
In FIG. 1 (a), one end of the top plate 61 (the left end in the figure) has a concave portion (linear groove) 61b on the lower surface side, and a convex portion (linear protruding portion) 65b at the upper end of the side plate 65. An example is shown in which the two are integrated. In this structure, as shown in the upper part of the figure (b), after the convex part 65b of the side plate 65 is fitted into the concave part 61b of the top board 61, the gap between the two parts is obtained as shown in the lower part of the figure (b). It is configured by driving (pressing) a wedge 69. When the wedge 69 is driven in this way, as indicated by an arrow in the figure, the concave portion 61b of the top plate 61 is pushed by the wedge 69 and deforms so as to expand in both directions, so that the top plate 61 and the side plate 65 are strong. To be integrated. On the other hand, since the top plate 61 is formed in a hollow double wall structure, the recess 61b is separated from the outer surface 61a that touches the human eye. For this reason, the above deformation stops at a portion that directly contacts the wedge 69 and the convex portion 65b of the side plate 65, and the deformation is not transmitted to the outer surface 61a. That is, the outer surface 61a remains a beautiful appearance without deformation.
In the above description, the integrated structure is configured by the procedure of fitting the convex portion 65b of the side plate 65 into the concave portion 61b of the top plate 61 and then driving (press-fitting) the wedge 69 into the gap between the two. The invention is not limited to assembly in such a procedure. For example, the wedge 69 is provided separately or integrally with the concave portion 61b of the top plate 61 or the convex portion 65b of the side plate 65, and in this state, the concave portion 61b of the top plate 61 and the convex portion 65b of the side plate 65 are fitted. Thus, the integrated structure may be configured.
As described above, FIG. 1 includes a hollow resin molded member (a) having a concave portion, a member (b) having a convex portion fitted to the concave portion, and a wedge member (c). And
When the concave portion of the resin molded member (a) and the convex portion of the member (b) are fitted, and the wedge member (c) is interposed between the inner wall of the concave portion and the outer wall of the convex portion. The deformation of the resin molded member (a) due to the interposition of the wedge member (c) is absorbed by the hollow and stops at the portion that contacts the wedge member (c) or the convex portion of the member (b). A fitting member characterized by this is shown. It is also shown that this fitting member can be used as a component of various assemblies.
In addition, when the same material as the top plate 61 is used as the material of the wedge 69 and the side plate 65, there is an effect that the processing can be performed at the time of recycling.
[0009]
2. Mold structure.
Next, the above-mentioned members (hollow double wall structure, complicated shape such as concave portion 61b and convex portion 65b for fitting, good surface appearance, and proper clearance between concave portion 61b and convex portion 65b to be fitted are set. A blow molding die suitable for molding the members (a) and (b) having the characteristics of good dimensional accuracy and uniform thickness that can be performed will be described. Note that the molding surface of the mold is naturally formed in a shape corresponding to the member to be molded, but in the drawing, a molding surface having a simple shape is drawn in order to simplify the description.
Mold for molding.
FIG. 2 is a cross-sectional view schematically showing a molding die.
The illustrated mold has an upper mold (first mold, female mold) 2 and a lower mold (second mold, male mold) 1.
The upper mold 2 has a plurality of (two in this example) blocks 2a and 2b that can be divided, and each block 2a and 2b is perpendicular to the parison 90 (see FIG. 3 etc.) It can be moved horizontally so that it can approach and move away. In the state where the blocks 2a and 2b are combined, it has a cylindrical hollow portion that is open at the bottom, and its inner surface is a part of the molding surface (molded for outer peripheral surface and bottom outer surface of deep-drawn shaped molded product) Surface). The inner surface forming a part of the molding surface is composed of thin metal plates 23a and 23b having a small heat capacity, and spaces 2S and 2S are provided behind them. The spaces 2S and 2S are secured by the metal plates 23a and 23b being supported by the main bodies 21a and 21b via the heat insulating materials 25a and 25b. The main bodies 21a and 21b are attached to a mold clamping device (not shown) via rear mounting plates 29a and 29b, and each block 2a and 2b is attached to the parison 90 suspended from above by the operation of the mold clamping device. It moves to approach or move away. The spaces 2S and 2S are configured so that heating fluid for heating and cooling fluid for cooling are supplied / discharged, whereby the metal plates 23a and 23b can be quickly brought to a desired temperature. It becomes possible to heat / cool.
The lower mold 1 has a shutter mechanism (mechanism having a function similar to a shutter mechanism of a camera) 17 that is a pinch member for fixing the tip (lower end) portion of the parison 90 at a substantially central portion of the upper end surface. A molding space is formed between the upper die 2 and the inner surface of the upper die 2 in a state of being located in the hollow of the upper die 2. The outer peripheral surface, upper end surface, and lower end upper surface of the lower mold 1 become a part of the molding surface (the inner peripheral surface, the bottom inner surface, and the molding surface for the edge surface of the deep-drawn molded product). The outer peripheral surface, the upper end surface, and the lower end upper surface forming part of the molding surface are formed of a thin metal plate 13 having a small heat capacity, and a space 1S is provided behind the thin metal plate 13. This space 1S is secured by the metal plate 13 being supported by the main body 11 via the heat insulating material 15. The main body 11 is attached to a mold clamping device (not shown) via a mounting plate 19 on the back. By the operation of the mold clamping device, the lower mold 1 is raised from the home position to the top dead center (uppermost position). It moves to reach the home position that is the bottom dead center (bottom position). The space 1S is configured so that heating fluid for heating and cooling fluid for cooling are supplied / discharged, whereby the metal plate 13 is quickly heated / cooled to a desired temperature. It becomes possible.
[0010]
3. Blow molding process.
Next, a blow molding process using the molding die having the above configuration will be described.
3-1. For upper mold movement.
First, the lower end portion of the parison 90 suspended from the die 52 (FIG. 3) is fixed by the shutter mechanism 17 (FIG. 3A), and the subsequent portion of the parison 90 is suspended along the side surface of the lower mold 1 (FIG. 3). 3 (b)), the blocks 2a and 2b of the upper mold 2 are brought close to each other (Figs. 4 (a) to (b)) to form a molding space, and the outer surface of the parison is heated to the molding surface. The molding surface is transferred by pressing and sufficiently contacting (FIG. 5A), cooled and solidified, and then taken out (FIG. 5B).
3-2. For lower mold movement.
FIGS. 2 to 5 show a mold that forms a molding space by bringing the upper mold 2 close to each other, but instead of such a mold, the molding space is raised by raising the lower mold. When using the mold that constitutes the upper end of the parison, the lower end of the parison hanging from the die is fixed by the lower shutter mechanism at the home position, and the blocks of the upper mold are brought close together and combined. Pinch the part and raise the lower mold to raise the trailing part of the parison along the side of the lower mold and position the lower mold in the hollow of the upper mold to form the molding space, outside the parison The molding surface is transferred by pressing the surface against the heated molding surface to bring it into close contact, cooled and solidified, and then taken out.
[0011]
4). Specific examples of the molding process (FIGS. 3 to 5).
Molding was performed using a normal blow molding machine (IPB-55EPL: manufactured by Ishikawajima-Harima Heavy Industries Co., Ltd.) and a normal blow molding ABS resin (# 88K4: manufactured by Techno Polymer Co., Ltd.).
First, with the upper mold 2 opened, the lower mold 1 is set to the uppermost position (the position of the top dead center shown in FIG. 3A), and then the parison 90 is discharged and drooped vertically. When the front end (lower end) reached the upper end surface of the lower mold 1 (FIG. 3A), the lower end of the parison 90 was pinched by the shutter mechanism 17 and fixed to the upper surface of the lower mold 1.
Subsequently, the pressure in the parison is set to 2 kg / cm by a pre-blow mechanism (not shown).² ~ 3Kg / cm² In the state maintained in the range of, was continuously discharged. As a result, the parison 90 descends so as to cover the lower mold 1 while bending. When the bent tip of the parison 90 reached the vicinity of the lower edge of the lower mold 1, the discharge of the parison 90 was terminated and the upper mold 2 was clamped (FIG. 3 (b)).
In the middle of the mold clamping operation, the parison 90 is pushed by the mold and deforms, so that the internal pressure of the parison 90 tends to increase. However, the pre-bloom (not shown) is used so that the internal pressure remains within the above-described pressure range. It controlled using the mechanism (FIG. 4 (a)).
After completion of mold closing, using the blowing needle used in the above pre-blow, 6 kg / cm² The inside of the parison 90a was pressurized to a pressure of 1 to press the outer surface of the parison against the molding surface (FIG. 4B). In addition, by supplying a heating fluid into the spaces 2S, 2S, and 1S, the surface temperature of the molding surface at the time of pressing is controlled to be 130 ° C, and then the heating fluid is discharged from the spaces 2S, 2S, and 1S. Then, the molded product 91 was cooled by jetting cooling water at 25 ° C. into the spaces 2S, 2S, and 1S (FIG. 5A).
After cooling, the upper mold 2 was opened, the lower mold 1 was inclined 45 degrees toward the mounting plate 19 operator side (for example, the front side in the figure), and the molded product 91 was taken out (FIG. 5B).
In the above description, the parison discharge conditions are set so that the weight of the molded product 91 falls within the range of 930 g to 970 g.
In this way, the above-mentioned features (hollow double wall structure, complicated shape such as the concave portion 61b and convex portion 65b for fitting, good surface appearance, and the appropriate gap between the concave portion 61b and the convex portion 65b to be fitted are provided. The component of the assembly of the present invention having good dimensional accuracy and uniform wall thickness can be formed.
[0012]
5). Characteristics of members molded by the above molding method.
In addition to the effects of the present invention, the resin molded member molded as described above further exhibits the following effects.
1. Since molding is performed not by injection molding but by blow molding, even a large member can be molded at low cost. Therefore, even members such as large furniture can be provided.
2. Since molding is performed not by injection molding but by blow molding, a hollow structure member can be molded relatively easily without complicating the mold structure. For this reason, it is easy to improve the weight reduction degree by the hollow structure.
3. Since the molding surface is formed by a high transfer blow generation method in which the outer surface of the parison is brought into close contact with the molding surface by heating the molding surface instead of the usual blow molding method, it can be used for product applications in which appearance is important.
4). Since the molding surface is heated not by the usual blow molding method but by the high transfer blow generation method in which the outer surface of the parison is in close contact with the molding surface, the concave and convex portions to be fitted must be formed with high dimensional accuracy. And the gap for press-fitting the wedge can be set appropriately. In addition, since the external dimensions can be configured with high accuracy, there is no backlash after assembly, and it can be used for product applications where backlash is not allowed.
5). Since it is molded using a mold as shown in FIG. 2 (a mold composed of an upper mold and a lower mold), there is no sink even if the member has a complicated shape such as a concave or convex portion. It can be molded with good dimensional accuracy. In addition, when forming an undercut structure with the conventional metal mold | die, not only the metal mold | die structure becomes very complicated and becomes very expensive, but there is also a site | part which cannot form an undercut structure depending on a site | part.
[0013]
6). Reinforcement structure for plate members such as top plate 61.
Next, a structure for reinforcing the hollow resin plate member 610 (member corresponding to the top plate 61, the side plate 65, etc.) will be described with reference to FIGS. 6 is a perspective view of the plate member 610, and FIG. 7 is an end view in the longitudinal direction of the groove 610c.
As shown in FIG. 6, on the back surface (upper surface in the drawing) of the resin plate member 610, there are two grooves 610c in addition to the concave portion 610b to be fitted with the above-mentioned convex portion. Is formed in the direction. As shown in FIG. 7, the depth of the groove 610 c is the depth at which the bottom surface of the groove does not contact the surface portion of the plate member 610. Further, a built-up portion 610d is formed on the bottom surface in the groove 610c. In addition, pin holes (blow pin holes, internal cooling holes) PH having sizes corresponding to the diameters of the following aluminum pipes AP are provided at both ends of the groove 610c. The number of grooves can be appropriately changed according to the size and shape of the plate member 610 or the strength desired to be achieved.
The reinforcement is performed as shown in FIGS. 7B and 7C. That is, the end APS of the aluminum pipe AP is inserted into the pin hole PH at one end of the groove 610c, the aluminum pipe AP is pressed down as shown by the arrow in the drawing, and the build-up portion 610d is pressed on the side surface of the aluminum pipe AP. The protruding portion of the tip APS is retracted to be locked in the pin hole PH, and the rear end portion is inserted into the pin hole PH on the other end side. Thereby, the aluminum pipe AP is fixed in the groove 610c, and the built-up portion 610d is pressed by the side surface of the aluminum pipe AP.
As described above, as a result of the build-up portion 610d being pressed by the side surface of the aluminum pipe AP, the bottom surface portion of the groove 610c is brought into close contact with the surface portion of the plate member 610 (the gap is shown in the figure, but the aluminum pipe is actually By attaching the AP, it becomes in a close contact state), and there is no feeling of bumpiness or chatter due to vibration between the front and back sides. That is, by a simple operation of attaching the aluminum pipe AP (operation that can be easily performed by the user), the plate member 610 can be provided with rigidity that can withstand concentrated loads in a direction perpendicular to the plate surface. In addition, when the bottom surface portion of the groove 610c and the surface portion of the plate member 610 are brought into close contact with each other at the time of molding, there is a problem that the surface appearance is sinked.
In the above example, the member provided with the recess 610b has been described. However, the present invention can be similarly applied to the resin plate member provided with the above-described protrusion (fitting protrusion). In addition, since the concave and convex portions are intended for fitting, of course, when reinforcing resin plate members (single plate members, etc.) that are not intended for fitting, the concave and convex portions are essential. is not.
In the above example, an example in which one aluminum pipe is assembled in the groove 610c is shown. However, the number of aluminum pipes assembled in the groove 610c according to the size and shape of the plate member 610 or the strength to be achieved. May be changed as appropriate.
In the above example, an aluminum pipe is used as the reinforcing material, but examples of the material of the reinforcing material include metals such as aluminum and iron, wood, laminated material, resin, and fiber reinforced resin. Examples of the shape include a pipe, a rod, and a plate.
[0014]
【The invention's effect】
  According to the present invention, it is possible to provide an assembly (such as assembly-type furniture) that is lightweight and can be easily assembled by a user and has no looseness or rattling after assembly. Further, in order to improve the appearance of the assembly, even if the members constituting the assembly are fitted and the wedge is press-fitted into the gap, the deformation due to the wedge can be prevented from appearing on the outer surface of the assembly.. FurtherIn addition, there is an effect that a highly rigid fitting member can be provided.
  According to the configuration 2 and the configuration 3 quoting the configuration 2 of the present invention, in addition to the above-described effects, there is an effect that it is possible to provide a fitting member or an assembly made of a resin molded product with high dimensional accuracy.
[Brief description of the drawings]
FIG. 1 is an explanatory view of a fitting structure for joining members constituting an assembly of the present invention, (a) is a perspective view schematically showing a top plate and a side plate to be joined, and (b) is a joined portion. Explanatory drawing which shows typically the cross-sectional structure of.
FIG. 2 is a schematic cross-sectional view of a mold for molding a member constituting the assembly of the present invention.
FIG. 3 is an explanatory diagram of a manufacturing process using the mold shown in FIG. 2;
4 is an explanatory diagram continued from FIG. 3 in the manufacturing process using the mold shown in FIG. 2;
5 is an explanatory diagram continued from FIG. 4 in the manufacturing process using the mold of FIG. 2;
FIG. 6 is a perspective view of a top plate as an example of a member of the assembly of the present invention.
7 is a schematic cross-sectional view of a reinforcing portion (groove portion) of the top plate of FIG. 6, in which (a) shows a state where a blow pin is pierced, (b) shows a state where a tip of a reinforcing pipe is inserted into a pin hole, (C) shows a state in which the rear end of the reinforcing pipe is fitted into the pin hole on the opposite side.
[Explanation of symbols]
1 Lower mold
2a, 2b Upper mold
61 Top plate
65 side plate
90 Parison
91 Molded products
AP Aluminum pipe

Claims

A hollow plate-shaped resin molded member (a) provided with a concave portion for fitting, a member (b) provided with a convex portion fitted to the concave portion, and a wedge member (c),
One plate surface of the hollow plate-shaped resin molded member (a) has a groove formed with a built-up portion on the bottom surface and holes on both side surfaces in the longitudinal direction. One end of the bar is locked and pushed down to the other side, and the other end of the bar is inserted into the other hole in a state where the build-up part is pressed, so that the inner surface of the bottom part is the inner side of the other plate. It is in close contact with the surface,
The wedge member (c) is fitted between the fitting concave portion of the resin molded member (a) and the convex portion of the member (b) and between the inner wall of the concave portion for fitting and the outer wall of the convex portion. The fitting member characterized by the above-mentioned.

In claim 1,
The hollow plate-shaped resin molded member (a) and the member (b) having a convex portion can supply / discharge heating / cooling fluid into a space behind a molding surface formed of a plate material having a small heat capacity. In addition, a heating / cooling fluid is supplied into a space behind a molding surface composed of an upper mold in which each block that can be divided into a plurality of blocks can be approached / separated from the parison and a plate material having a small heat capacity / Using a blow mold having a lower mold that can be discharged and that forms a molding space with the upper mold, the lower end of the parison is pinched to the upper part of the lower mold and then suspended from the die The rear part of the parison is moved relative to the side of the molding surface so that the rear part of the lower mold covers the side of the molding surface, and the blocks of the upper mold are combined to form a recess / convex for fitting. part Ru is molded formed so as to have,
The fitting member characterized by the above-mentioned.

An assembly comprising the fitting member according to claim 1 or 2 in at least one place.