JP4324389B2 - Folding box - Google Patents

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Publication number
JP4324389B2
JP4324389B2 JP2003031697A JP2003031697A JP4324389B2 JP 4324389 B2 JP4324389 B2 JP 4324389B2 JP 2003031697 A JP2003031697 A JP 2003031697A JP 2003031697 A JP2003031697 A JP 2003031697A JP 4324389 B2 JP4324389 B2 JP 4324389B2
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JP2003300526A (en
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浩司 生野
明弘 木村
喬夫 中山
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Ube Exsymo Co Ltd
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Ube Nitto Kasei Co Ltd
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Description

【0001】
【発明の属する技術分野】
本発明は、折畳み箱の改良に関する。
【0002】
【従来の技術】
折畳み可能な通い箱等の箱の従来技術として、先に、本出願人は、次のような折畳み箱を特許出願し、実用化もしている(特許文献1)。このものは、ポリプロピレン(以下、PPと略記する)製の二枚の基板間に同じくPP製の中空コア材をサンドイッチ状に一体成形したPP製段ボールをカットして得られた底板と、底板の両側に折曲げにより立設され、長尺側側面部を構成する長尺側側板と、長尺側側板の前後開口部に配置される同じくPP製段ボールからなる一対の短尺側側板と、両側板の上縁に嵌合されて枠組を構成する枠縁と、各枠縁が突合わされるコーナ部に嵌合されて縁枠を連結する4つの上部コーナ材、並びに底板のコーナ部に嵌合されて、各側板の立上げ形状を保持する4つの下部コーナ材とを備えている。
【0003】
そして、各長尺側側板には上部、下部及び中央にヒンジとなる折畳み線が形成され、底面板側に向けてく字形に折畳み可能としたものであり、各短尺側側板の上部には折畳み線を形成し、縁枠の内側に向けて折畳み可能としたものであり、各側板の上縁を枠縁及びコーナ材により箱枠状に一体に組立てた状態で、各折畳み線をヒンジとして折畳むことにより、縁枠内に平坦化され、かつ折畳み線をヒンジとして、各側板を立ち上げることで箱形状に造形されるものである。
【0004】
この従来技術では、箱の保管時には、これを平坦化して段積みすることにより減容化でき、使用時においては簡単な組上げ操作で箱状に展開形成することができ、またPPの持つ材料強度により繰返し何度でも使用できるといった利点がある。
【0005】
【特許文献1】
特許第2546317号公報
【0006】
【特許文献2】
特開平6−135440号公報
【0007】
【発明が解決しようとする課題】
しかしながら、特に、上述した特許文献2に開示された従来の折畳み箱にあっては、折畳みを可能とするためのすべての折畳み線が、PP製段ボールのうちの一方の基板を残して他方の基板及びコアに直交してその長手方向に切れ目を入れることにより外側の基板をヒンジとして折畳み展開可能に形成されるもの(いわゆる半切り)となっているが、PPのヒンジ特性による耐久性はあるものの、さらなる耐久性の向上が要請されるほか、切れ目がナイフエッジであって、この部分に異物が挟み込まれると最終展開することができないという欠点があった。
【0008】
また、実際の物流に係わる梱包現場においては、箱を乱雑に取扱うことが多いため、前記構造の折畳み箱にあっては、片持ち支持された側の短尺側側面板を正規の位置に固定することが難しく、箱の内側に向う大きな外力が加わると、簡単にへたりこんでしまい、造形が保てなくなる場合が多かった。
また、その逆に重量物を梱包して段積みすると、短尺側側板が外側に開いてしまい、これが戻る際に長尺側側板の端部にかじり込んでしまい、元に戻す作業が面倒となっていた。
【0009】
このような脆弱性を防止するためには、四隅部分に補強用のコーナ支柱を設けたり、内倒れ防止ストッパなどを設けることも考えられるが、いずれも構造の複雑さや部品点数の増加を伴い、不経済であり、加えて、折畳み及び展開時の作業が複雑で面倒なものとなり、実際の現場に即応できないものとなるといった課題がある。
【0010】
本発明は、以上の課題を解決するものであって、その目的は、構造が簡単で部品点数が少なく、しかも容易に折畳み及び立上げ展開することができ、組上げた状態では、きわめて堅牢な折畳み箱を提供せんとするものである。
【0011】
【課題を解決するための手段】
以上の目的を達成するため、本発明のうち請求項1に記載の発明は、ポリプロピレン製の二枚の基板間に同じくポリプロピレン製の中空コア材をサンドイッチ状に一体成形したポリプロピレン製段ボールをカットして得られた底板と、底板の両側に折曲げにより立設され、長尺側側面部を構成する長尺側側板と、長尺側側板の前後開口部に90°交叉して配置される同じくポリプロピレン製段ボール製の一対の短尺側側板と、両側板の上縁に嵌合されて枠組を構成する枠縁と、各枠縁が突合わされるコーナ部に嵌合されて縁枠を連結する4つの上部コーナ材とを備え、前記各長尺側側板には上部、下部及び中央にヒンジとなる折畳み線が形成され、前記底面板側に向けてく字形に折畳み可能としたものであり、前記各短尺側側板の上部には折畳み線を形成し、縁枠の内側に向けて折畳み可能としたものであり、前記各側板の上縁を前記枠縁及びコーナ材により箱枠状に一体に組立てた状態で、各折畳み線をヒンジとして折畳むことにより、縁枠内に平坦化され、かつ折畳み線をヒンジとして、各側板を立ち上げることで箱形状に造形される折畳み箱において、前記長尺側側板の中央に形成される折畳み線は、外側の基板を残して長手方向に切れ目を入れることにより外側の基板をヒンジとして折畳み展開可能にしたものであって、その両端部を所定の長さの非切れ目部位とし、前記長尺側及び短尺側側板の上部に形成される折畳み線は、熱溶融により断面V字形に形成されたものであることを特徴とするものである。
【0012】
従って、本発明では、中央の折畳み線の両側を非切れ目部位とすることで、端部からの亀裂の発生を防止でき、繰返し折畳み展開に伴うヒンジの劣化を防止し、耐久性を向上できる。また、上部側折畳み線はV字形の溝形状となっているため、開閉に際し、この部分に異物が挟み込まれることがない。
【0015】
本発明のうち請求項に記載の発明は、前記長尺側側板の両側部には箱端面より突出する短尺側側板の噛み込み防止用タブを一体に形成したことにより、重量物により、側板が外方に湾曲膨出したとしても噛み込み防止用タブの存在により、これが戻る際の板同士の噛み込みがなく、作業性が向上する。
【0016】
本発明のうち請求項に記載の発明は、前記底板のコーナ部に嵌合されて各側板の立上げ形状を保持する4つの下部コーナ材を備え、下部コーナ材の内側に長尺側側板の内側に突出するストッパプレートを立ち上げ形成し、このストッパプレートの内側に突起を突出してなり、折畳み状態の短尺側側板を回動して立ち上げる際に、側板の端縁が前記突起を弾発的に乗越え、立上げ状態で突起により戻り止めされることを特徴とするものである。従って、本発明では、外力による短尺側側板の内側へのへたり込みがなく、十分な強度で立体造形を維持できるとともに、折畳み時、或いは展開時には、突起を乗越えて内側または外側に回動する瞬発的な力を加えればよいため、折畳み展開作業も簡単である。
【0017】
本発明のうち請求項に記載の発明は、前記上部コーナ材のコーナ部下部に各側板の上部側端縁に当接する延長部を一体に設けたことを特徴とするものである。従って本発明では、立体造形時に上部側のコーナ形状も正確に形状出しすることができる。
【0018】
本発明のうち請求項に記載の発明は、前記長尺側側板の中央に形成される折畳み線をさけた位置において、長尺側側板の端縁とこれと交差する短尺側側板の端縁のそれぞれに互いに係合可能な係止部材を設けたことを特徴とするものである。従って、本発明では、短尺側側板の外方に対する湾曲膨出現象そのものがなく、タブをなくすことができる。
【0019】
本発明のうち請求項に記載の発明では、前記底板の端縁に設けた下部枠縁の外端縁に立ち上げ部を立設し、この立上げ部の内側に係合部を形成するとともに、下部枠縁の板面に戻り止め用の突起を突設する一方、前記短尺側側板の下部枠縁の下端縁外側に前記凹部に鈎形係合する係合部を形成したものであり、製箱状態で前記短尺側側板の下部枠縁が前記突起を弾的に乗越えて前記係合部同士が鈎形係合するとともに、前記突起により戻り止めされることを特徴とする。従って、本発明では、請求項と同様な効果が得られ、また下部コーナ材も省略できる。
【0020】
本発明のうち請求項に記載の発明は、長尺側側板の折畳み状態で両折畳み面を離接可能に接合する手段を設けたことにより、折畳み状態での折畳み線位置のヒンジ抵抗による戻りがなく、平担性を保持できる。
【0021】
【発明の実施の形態】
以下、本発明の好ましい実施の形態につき、添付図面を参照して詳細に説明する。図1〜図3は本発明の第一実施形態を示し、このうち図1,図2は、本発明に係る折畳み箱の部品構成を示す分解斜視図であり、図3は同折畳み箱の組立状態を示す斜視図である。
【0022】
この折畳み箱を構成する全部品は、廃棄時のダイオキシンの発生防止や、リサイクル等を考慮してポリプロピレン(以下、PPと略記する)製の成形体からなっている。このうち、底板1、長尺側側板2、及び短尺側側板3は、PP製の二枚の基板間に同じくPP製の中空コアをサンドイッチ状に一体成形したプラスチック製の段ボールからなっており、長尺側側板2は底板1の両側に折曲げにより立ち上げ成形される。なお、図1において、底板1及び側板2,3に形成された線の集合はコアの形成方向を示すものであり、側板2,3を立ち上げた状態で、強度が発現されるコア方向にカットされている。
【0023】
また、上部縁枠4,5及び上部コーナ材6、底板1の開口端面を縁取る縁枠7、底板1の隅角部を補強する下部コーナ材8、短尺側側板3に取付けられる把手枠9及び短尺側側板3の下部縁枠10はPP製の押出しまたは射出成形体から構成される。
【0024】
以上の各部材の組立手順としては、図2に示すように、側板2の上部に上部縁枠4を嵌合し、また両側板2を底板1から折曲げて立上げ、下部コーナ材8を両者の各角部に超音波溶接等によって一体に組付け、縁枠7を底板の端面に嵌合し、超音波溶着等によって各部を接続する。同様に、短尺側側板3の上下縁にも上下縁枠5,10を嵌合し、また把手孔に把手枠9を取付け、最終的に上部コーナ材6を上部縁枠4,5の接合端に嵌合し、超音波溶着等をすることで、図3に示すように、上部開口された折畳み箱が得られる。なお、図中、小さな円が描かれた部分は超音波溶着によって穿たれた孔である。図4はその一部を示す側断面図である。
【0025】
以上において、長尺側側板2にはその長手方向に沿って上下3つの折畳み線11,12,14が形成され、各折畳み線を介して内側にく字形の折畳みが可能となっている。このうち、下部側折畳み線11は、図5(a)に示すように、外側の基板aを残して内側の基板b及びコアcに直交してその長手方向に切れ目dを入れること(半切り)により外側の基板をヒンジとして折畳み展開可能にしたものである。
【0026】
これに対し、中央の折畳み線12は、前記と同様に一般部においては図5(a)に示すように、外側の基板aを残して内側の基板b及びコアcに切れ目を入れること(半切り)により外側の基板をヒンジとして折畳み展開可能にしたものであるが、(b),(c)に示すように、その両端部を非切れ目部分eとし、切れ目dに沿ってコアcの折曲げを行うようにしている。これは、ヒンジ特性が高いPPを用いたとしても、折曲げを繰返すことで切れ目dの部分が裂けるためで、非切れ目部分eを両端に形成することで、繰返し折曲げ性を向上させている。なお、この部分における非切れ目部分eの長さは、折曲げ作業性と裂け防止との兼合いで、3mm以上15mm以下とすることが好ましい。
【0027】
また、上部側折畳み線14は、熱溶融によって断面V字形に形成されている。これは、例えば、図6(a),(b)に示すように、側板2の上縁に上部縁枠4を嵌合し、縁枠4を含むヒンジ形成位置に先端部V形をした熱刃15を押し当て、断面V字形の折曲げ線14を形成するものである。この場合は、図7(a)に示すように直立した状態で外側が断面V字形溝形状となっているため、すべての折畳み線が半切りであるものと比較して、繰り返しの曲げに対する耐久性が向上するとともに、この位置に異物が挟み込まれることがない。なお、上述した下部側折畳み線11については、図5(a)に示されるように半切りとした例を示したが、図6(a),(b)及び図7(a),(b)に示されるように熱溶融によって断面V字形に形成することが好ましい。この場合、折畳み部分に中空部が露出しない結果、ここからほこり等が中空部に侵入するのを阻止できるからである。
【0028】
また、短尺側側板3の上部であって、上部縁枠5の直下に折畳み線16が形成され、枠縁内側への折畳みを可能としている。この折畳み線16もV字形ヒンジとなっており、同じくこの部位における異物の挟み込みを防止している。
【0029】
さらに、長尺側側板2の長手方向両側には、その端縁からやや突出した一対のタブ17が形成されている。このタブ17は、特に図4に想像線で示すように、短尺側側板3が長尺側側板2の端面外方に膨出し、これが戻る際に側板2の端縁が側板3の内側に入り込むことによる組上げ時の強度低下を防止するために設けられている。
【0030】
また、下部コーナ材8の長尺側側板2の外部に配置される壁部の内側には図1に白抜き矢印aで拡大して示すように、平板状のストッパプレート18が長尺側側板2に沿って起立した状態に一体に立設され、これに対し、底板1の両側面にはこのプレート18を受入れるための切欠1aが形成されている(白抜き矢印bで拡大して示すように、ストッパプレート18は底板にも沿った断面L字状とすることもできる)。このストッパプレート18は、短尺側側板3を立てた状態における内側への戻りを防止するもので、外側に回動した状態で側板3の端縁がストッパプレート18の端面に突設された突起18aを弾発的に乗越えることで、図4に示すように、戻り止めされ、立体形状に保持される。
【0031】
さらに、各上部側コーナ材6のコーナ部下部には下部側に伸びて折畳み線14の外方を覆う延長部6aが形成され、この延長部6aにより、両側板2,3の上部側における外方への回動を規制し、立体造形された状態での箱の形状を正確に形づけると同時にこの部位における保形性も確保している。
【0032】
次に、以上の構成の折畳み箱の折畳み手順を図8を用いて説明する。図3に示す立体造形状態から、先ず(a)に示すように、短尺側側板3を折畳み線16をヒンジとして上部側枠形状の内側に向けて折畳む。この操作は、ある程度強い力で側板3を内側に押すことにより、形状保持のための突起18aを乗越えて内側に折畳まれる。なお、現場での作業では蹴り込みなどによって行われることも想定される。そして、この状態では、長尺側側板2を直線状に立設する機能は失われるため、(b)に示すように、側面を内側に向けて押し付けることにより、各折畳み線11,12,14をヒンジとして内側にく字形をなして折畳まれ、最終的に(c)に示すように上から押圧すると平坦状になり、この状態で段積み積層することで、減容化した状態での保管が可能となる。(c)の状態から、箱状に造形するには以上とは逆の手順で行えばよく、前記と同じくその作業も簡単である。
【0033】
図9は、本発明の第二実施形態を示す。この実施形態においては、噛み込み防止用のタブ17が長尺側側板2の両端部中央位置一ヶ所に突出形成されている以外は前記実施形態と同様である。本実施形態では、短尺側側板3が最も外方に膨出する中央位置に設けられているので、噛み込み防止上有利であるとともに、タブ形成位置の中央に設けられている折畳み線12における非切れ目部位をタブ形成位置とすれば良いので、折畳み時におけるヒンジ抵抗も削減できる。
【0034】
図10は、本発明の第三実施形態を示す。この実施形態においては、前記第二実施形態と同じく中央に突設されたタブ17の上部位置において、長尺側側板2及び短尺側側板3の交差位置で互いに係合する係止片20を超音波溶着により取付けたこと、及び下部コーナ材8のない点が前記各実施形態と異なるものである。
【0035】
両係止片20はいずれもチャンネル状の押出成形体または射出成形体からなるもので、白抜き矢印cで拡大して示すように前記各側板2,3を挟み込んだ状態で固定されるベース20aと、ベース20aの側面に一体化された断面コ字型の鈎状片20bを備え、製箱状態では、両鈎状片20b同士が係合することで短尺側側板3の膨出を防止する構造としている。なお、短尺側側板3の両端縁と係止片20の端縁が同一線上となるよう、短尺側側板3に対する取付け位置に切り欠きを形成し、この位置に係止片20を取付けている。
【0036】
また、底板1の下部枠縁21と短尺側側板3の下部枠縁22との係合により、製箱状態に保持できるようにしている。すなわち白抜き矢印dに拡大して示すように、底板1の下部枠縁21の端縁に設けた立上げ部21aの内側には凹部21bが形成され、更に下部枠縁21の板面にはその長手方向に沿って戻り止め用の突起21cが突出形成されている。これに対し、短尺側側板3の下部枠縁22の下縁外側には長手方向に沿って前記凹部21bに鈎形係合する凹部22aが形成されている。
【0037】
従って、製箱時において、短尺側側板3の下部枠縁22の下端が図中想像線で示すように回動すると突起21cに突き当るが、この突起21bを弾発的に乗越えることで凹部21b,22a同士が鈎形に係合し、それ以上の回動が規制される。また、この側板3を折畳み方向に押戻そうとする外力が加わった場合には、枠縁22の下縁が前記突起21aに度当りし、戻りが防止される。なお、下部コーナ材8のない状態でも下部枠縁21の立上げ部21aの端縁が長尺側側板2の下部側に当接することで、直角位置決めがなされ、形状保持性を維持することができる。
【0038】
次に、図11,12は本発明の第四実施形態を示し、図11は分解図、図12は組立図である。本実施形態では、タブ17が省略されている以外は第三実施形態と同様であるので、符号のみによりその説明は省略する。但し、本実施形態において特筆すべきことは、前記係止片20によって、製箱状態では長尺側側板2と短尺側側板3の交差部は強固に係合し、互いの膨出及びこれに伴う不具合は解消されるため、タブそのものも省略することが可能であることに基づくもので、コーナ部の形状が直線状に簡素化し、外観上も好ましいものとなる。
【0039】
次に、図13,14は第四実施形態を更に発展させた第五実施形態を示し、本実施形態では係止片20を各コーナ部に付上下二つ設けたことにより、膨出現象を更に確実に防止する点、並びに、図13の一部に拡大して示すように、長尺側側板3に設けられた上下の係止片20のベース20aに互いに嵌め合い係合する雌雄の樹脂ファスナ30,31を設けた点が前記実施形態とは異なる。
【0040】
すなわち、折畳み状態で長尺側側板2は、図14に示すように折畳み先2をヒンジとして内側に向けてく字形に折曲げられることになるが(同図では、厚さ等を誇張して表現している)、このヒンジ位置における反発弾性により、常時元の状態に戻る力が加わっており、このままでは浮き上がりが生じて折畳み時における平担性が保てない。折畳み線として、半切りではなく、熱溶融を選択した場合には、箱を折り畳んだときの反力がなおさら大きい。このような場合、折畳み時の箱について、収納性に難が生じることが懸念される。そこで、折畳み時に最も接近する位置である係止片20のベース20a位置にそれぞれ樹脂製の雌雄ファスナ30,31を設け、ファスナ同士を係合(嵌め合い等)することで折畳み形状を強制的に保ち、これによって箱の収納性を確保するものである。
【0041】
なお、本実施形態では、接合手段として樹脂ファスナを用いたが、雌雄の面ファスナにより折畳み保持できる構造とすることができ、また長尺側側板2に対する取付け位置も、折畳み線12を挟む他の対向位置に配置することができる。
【0042】
以上における折畳み線の形成方法としては、図5〜図7に示す切れ目あるいは、熱圧着による形成方法のほか、図15(a),(b)に示す方法がある。この方法では、折畳み線に沿うD1部分を基板a,b及びコアcを全て切断して全通した全切断線とし、その間のD2部分を折り目を付与しやすくするための罫線とし、これが交互に所定ピッチ及び長さで連続させることにより、恰も破線が連続する形の折畳み線を形成するものである(なお、同図では、本発明の理解を助けるために、全切断線D1の幅寸法を誇張して描いているが、実際は線状のものである)。この場合、全切断線D1と罫線D2の長さ比(例えば、3cmづつ)に応じて、ヒンジの反発弾性が異なり、D1>D2の場合には反発弾性が小さい代りに、耐久性に乏しい。その逆である場合には反発弾性が高いが、耐久性に富むものとなる。また、上記罫線については通常の加圧による罫線の他、加熱溶融による熱罫線、外側の基板を残して長手方向に切れ目を入れて形成される半切り罫線などが選択できる。従って、本実施形態では、用途に応じてヒンジ特性の選択幅が広がるものとなる。
【0043】
なお、以上の各実施形態においては、モデル的な箱形状としているが、その大きさや、縦横比、深さなどは、要求される寸法に応じて、折畳み寸法などの幾何的寸法が可能な範囲で種々変更可能であることは勿論である。
【0044】
【発明の効果】
以上の説明により明らかなように、本発明による折畳み箱によれば、構造が簡単で部品点数が少なく、しかも容易に折畳み及び立上げ展開でき、組上げた状態ではきわめて堅牢となる利点がある。
【図面の簡単な説明】
【図1】本発明の第一実施形態による折畳み箱の部品配置を示す分解斜視図である。
【図2】同取付形状を示す分解斜視図である。
【図3】同組立完成状態を示す斜視図である。
【図4】同組立状態における部分側断面図である。
【図5】(a)〜(c)折畳み線の切れ目形成位置と、非形成位置及びその配置を示す斜視図である。
【図6】(a),(b)は溶融による折畳み線形成手順を示す説明図である。
【図7】同折曲げ線をヒンジとした開閉形状を示す部分断面図である。
【図8】(a)〜(c)は折畳み箱の折畳み手順を示す斜視図である。
【図9】本発明の第二実施形態における折畳み箱の立体造形状態を示す斜視図である。
【図10】本発明の第三実施形態における折畳み箱の立体造形状態を示す斜視図である。
【図11】本発明の第四実施形態による折畳み箱の部品配置を示す分解斜視図である。
【図12】同立体造形状態を示す斜視図である。
【図13】本発明の第五実施形態による折畳み箱の立体造形状態を示す斜視図である。
【図14】同折畳み箱を折畳んだ状態の半断面図である。
【図15】折畳み線の形成方法の他の実施形態を示す説明図である。
【符号の説明】
1 底板
2 長尺側側板
3 短尺側側板
4,5 上部枠縁
6 上部コーナ材
6a 下部延長片
7 底板枠縁
8 下部コーナ材
10 下部枠縁
11,12,14,16 折畳み線(14,16 熱溶融V形溝)
17 噛み込み防止用タブ
18 ストッパプレート
18a 突起
20 係止片
20b 鈎状片
21 底板側下部枠縁
21a 立上げ部
21b 凹部
21c 戻り止め用突起
22 短尺側側板の下部枠縁
22a 凹部
30,31 樹脂ファスナ(接合手段)
a,b 基板
c コア
d 切れ目
e 非切れ目部分
D1 全切断線
D2 罫線
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of a folding box.
[0002]
[Prior art]
As a prior art of a foldable return box or the like, the present applicant has previously filed a patent application for the following folding box and put it into practical use (Patent Document 1). This is made up of a bottom plate obtained by cutting a PP corrugated cardboard formed by integrally forming a hollow core material made of PP in a sandwich between two substrates made of polypropylene (hereinafter abbreviated as PP), A long side plate that is erected by bending on both sides and constitutes a long side surface portion, a pair of short side plates that are also made of cardboard made of PP and are disposed in front and rear openings of the long side plate, and both side plates A frame edge that is fitted to the upper edge of the frame, and a corner portion where each frame edge is abutted, and four upper corner members that are connected to the edge frame, and a corner portion of the bottom plate. And four lower corner members that hold the rising shape of each side plate.
[0003]
Each long side plate is formed with a folding line as a hinge at the top, bottom and center, and can be folded into a square shape toward the bottom plate, and a folding line is formed at the top of each short side plate. It can be folded toward the inside of the edge frame, and each fold line is folded as a hinge with the upper edge of each side plate assembled into a box frame shape with the frame edge and corner material. By this, it is flattened in the edge frame, and is shaped into a box shape by raising each side plate with the folding line as a hinge.
[0004]
In this prior art, when storing a box, the volume can be reduced by flattening and stacking, and when used, it can be expanded and formed into a box shape by a simple assembling operation, and the material strength of PP Has the advantage that it can be used over and over again.
[0005]
[Patent Document 1]
Japanese Patent No. 2546317 [0006]
[Patent Document 2]
JP-A-6-135440
[Problems to be solved by the invention]
However, in particular, in the conventional folding box disclosed in the above-mentioned Patent Document 2, all the folding lines for enabling folding are left on one board of the PP cardboard, and the other board. In addition, by forming a cut in the longitudinal direction perpendicular to the core, the outer substrate can be folded and unfolded as a hinge (so-called half-cut), but there is durability due to the hinge characteristics of PP. In addition to the demand for further improvement in durability, there is a drawback that the cut edge is a knife edge, and if a foreign object is caught in this portion, it cannot be finally developed.
[0008]
Moreover, in the actual packing site related to physical distribution, the box is often handled in a messy manner. Therefore, in the case of the folding box having the above structure, the short side plate on the side supported by the cantilever is fixed at a proper position. It was difficult, and when a large external force toward the inside of the box was applied, it was easily squeezed and it was often impossible to maintain the shape.
On the other hand, if heavy items are packed and stacked, the short side plate opens to the outside, and when it returns, it bites into the end of the long side plate, which makes it cumbersome to restore it. It was.
[0009]
In order to prevent such weakness, it is conceivable to provide reinforcing corner posts at the four corners, or to provide an internal fall prevention stopper, etc., but both increase the complexity of the structure and the number of parts, In addition, there is a problem that the work at the time of folding and unfolding becomes complicated and troublesome and cannot be immediately adapted to the actual site.
[0010]
The present invention solves the above-described problems, and its purpose is to have a simple structure, a small number of parts, and can be easily folded and set up, and in an assembled state, it is a very robust folding. It is intended to provide a box.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 of the present invention cuts a polypropylene corrugated cardboard in which a polypropylene hollow core material is also integrally formed in a sandwich shape between two polypropylene substrates. The bottom plate obtained in this manner, the long side plate that is erected by bending on both sides of the bottom plate, and constitutes the long side surface portion, and the front and rear openings of the long side plate are arranged 90 ° across the same. A pair of short corrugated side plates made of polypropylene, a frame edge that is fitted to the upper edges of both side plates to form a frame, and a corner portion where each frame edge is abutted to be connected to connect the edge frames 4 Each of the long side plates is formed with a folding line as a hinge at the top, bottom and center, and can be folded in a square shape toward the bottom plate side. Fold the top of the short side plate A folding line is formed and can be folded toward the inside of the edge frame, and each folding line is folded in a state where the upper edge of each side plate is assembled into a box frame shape by the frame edge and corner material. By folding as a hinge, it is flattened in the edge frame and is formed in the center of the long side plate in a folding box that is shaped into a box shape by raising each side plate using the folding line as a hinge. The fold line is formed by making a cut in the longitudinal direction while leaving the outer substrate, so that the outer substrate can be folded and unfolded as a hinge. The folding line formed on the upper side of the long side plate and the short side plate is formed in a V-shaped cross section by heat melting.
[0012]
Therefore, in the present invention, by making both sides of the central fold line into unbroken portions, it is possible to prevent cracks from being generated from the end portion, to prevent deterioration of the hinge due to repeated folding and unfolding, and to improve durability. In addition, since the upper folding line has a V-shaped groove shape, no foreign matter is caught in this portion when opening and closing.
[0015]
The invention according to claim 2 of the present invention is such that the tabs for preventing biting of the short side plate protruding from the box end surface are integrally formed on both sides of the long side plate, so that the side plate Even if the bulge bulges outward, the presence of the biting prevention tab prevents biting between the plates when the tab returns, improving workability.
[0016]
The invention according to claim 3 of the present invention is provided with four lower corner members that are fitted to the corner portions of the bottom plate and hold the rising shape of each side plate, and the long side plate is provided inside the lower corner material. A stopper plate that protrudes to the inside of the stopper plate is formed, and the protrusion protrudes to the inside of the stopper plate. When the folded short side plate is turned up and raised, the edge of the side plate elastically projects the protrusion. It is characterized in that it gets over the vehicle spontaneously and is detented by a protrusion in the upright state. Therefore, in the present invention, there is no sag inward of the short side plate due to external force, it is possible to maintain the three-dimensional modeling with sufficient strength, and when folded or unfolded, it gets over the protrusion and rotates inward or outward. Folding and unfolding work is easy because it is sufficient to apply instantaneous force.
[0017]
The invention according to a fourth aspect of the present invention is characterized in that an extension portion that comes into contact with an upper edge of each side plate is integrally provided at a lower portion of the corner portion of the upper corner material. Therefore, in the present invention, it is possible to accurately shape the upper corner shape at the time of three-dimensional modeling.
[0018]
The invention according to claim 5 of the present invention is such that the edge of the long side plate intersects with the edge of the short side plate at a position where the folding line formed at the center of the long side plate is avoided. Each is provided with a locking member which can be engaged with each other. Therefore, in the present invention, there is no curved bulging phenomenon with respect to the outside of the short side plate, and the tab can be eliminated.
[0019]
In the invention according to claim 6 of the present invention, a rising portion is erected on the outer edge of the lower frame edge provided on the edge of the bottom plate, and an engaging portion is formed inside the rising portion. In addition, a protrusion for detent is provided on the plate surface of the lower frame edge, and an engaging portion that is hook-engaged with the recess is formed outside the lower edge of the lower frame edge of the short side plate. , the engaging portions lower frame edge of the short side plate in manufacturing box state gets over the protrusion to elastically together with to hook shape engagement, characterized in that it is detent by the protrusion. Therefore, in this invention, the effect similar to Claim 2 is acquired and a lower corner material can also be abbreviate | omitted.
[0020]
The invention according to claim 7 of the present invention is the return by the hinge resistance of the folding line position in the folded state by providing means for releasably joining the folded surfaces in the folded state of the long side plate. No flatness can be maintained.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 to 3 show a first embodiment of the present invention, among which FIGS. 1 and 2 are exploded perspective views showing the components of a folding box according to the present invention, and FIG. 3 is an assembly of the folding box. It is a perspective view which shows a state.
[0022]
All parts constituting the folding box are made of a molded body made of polypropylene (hereinafter abbreviated as PP) in consideration of prevention of dioxin generation at the time of disposal and recycling. Among them, the bottom plate 1, the long side plate 2, and the short side plate 3 are made of plastic corrugated cardboard in which a PP hollow core is integrally formed in a sandwich shape between two PP substrates, The long side plate 2 is raised and formed on both sides of the bottom plate 1 by bending. In FIG. 1, a set of lines formed on the bottom plate 1 and the side plates 2 and 3 indicate the core formation direction, and in the state where the side plates 2 and 3 are raised, the core direction in which strength is expressed. It has been cut.
[0023]
Further, the upper edge frames 4 and 5 and the upper corner material 6, the edge frame 7 that borders the opening end surface of the bottom plate 1, the lower corner material 8 that reinforces the corners of the bottom plate 1, and the handle frame 9 that is attached to the short side plate 3. And the lower edge frame 10 of the short side plate 3 is made of an extruded or injection molded product made of PP.
[0024]
As shown in FIG. 2, assembling procedures of the respective members described above, the upper edge frame 4 is fitted to the upper part of the side plate 2, the both side plates 2 are bent from the bottom plate 1, and the lower corner material 8 is raised. The two corners are integrally assembled by ultrasonic welding or the like, the edge frame 7 is fitted to the end face of the bottom plate, and the respective parts are connected by ultrasonic welding or the like. Similarly, the upper and lower edge frames 5 and 10 are also fitted to the upper and lower edges of the short side plate 3, the handle frame 9 is attached to the handle hole, and finally the upper corner material 6 is joined to the upper edge frames 4 and 5. As shown in FIG. 3, a folding box having an upper opening is obtained. In the figure, the portion where a small circle is drawn is a hole made by ultrasonic welding. FIG. 4 is a side sectional view showing a part thereof.
[0025]
In the above, the long side plate 2 is formed with three upper and lower fold lines 11, 12, and 14 along the longitudinal direction thereof, and can be folded inwardly via each fold line. Among these, as shown in FIG. 5 (a), the lower folding line 11 has a cut d in the longitudinal direction perpendicular to the inner substrate b and the core c, leaving the outer substrate a (half cut). ), The outer substrate can be folded and unfolded as a hinge.
[0026]
On the other hand, as shown in FIG. 5 (a), the central folding line 12 cuts the inner board b and the core c while leaving the outer board a (half) in the general part as described above. The outer substrate can be folded and unfolded as a hinge by cutting, but as shown in (b) and (c), both ends thereof are set as non-cut portions e, and the core c is folded along the cut d. Bending is done. This is because even if PP having a high hinge characteristic is used, the portion of the cut d is torn by repeating the bending, and the non-cut portion e is formed at both ends, so that the repeated bending property is improved. . In addition, it is preferable that the length of the unbroken portion e in this portion is 3 mm or more and 15 mm or less in view of the workability of bending and the prevention of tearing.
[0027]
Moreover, the upper side folding line 14 is formed in the cross-sectional V shape by heat melting. For example, as shown in FIGS. 6 (a) and 6 (b), the upper edge frame 4 is fitted to the upper edge of the side plate 2, and the tip V is formed at the hinge forming position including the edge frame 4. The blade 15 is pressed to form a bending line 14 having a V-shaped cross section. In this case, as shown in FIG. 7 (a), since the outer side has a V-shaped groove shape in the upright state, the durability against repeated bending compared to the case where all the folding lines are half-cut. As a result, foreign matter is not caught at this position. In addition, about the lower side folding line 11 mentioned above, although the example cut half as shown in Fig.5 (a) was shown, Fig.6 (a), (b) and Fig.7 (a), (b It is preferable to form in a V-shaped cross section by thermal melting as shown in FIG. In this case, as a result of the hollow portion not being exposed at the folded portion, dust and the like can be prevented from entering the hollow portion from here.
[0028]
In addition, a fold line 16 is formed at the upper part of the short side plate 3 and directly below the upper edge frame 5 to enable folding to the inside of the frame edge. This fold line 16 is also a V-shaped hinge, which similarly prevents foreign matter from being caught in this part.
[0029]
Furthermore, a pair of tabs 17 that slightly protrude from the edges are formed on both sides in the longitudinal direction of the long side plate 2. As shown in phantom lines in FIG. 4, the tab 17 is formed such that the short side plate 3 bulges outward from the end face of the long side plate 2, and the edge of the side plate 2 enters the inside of the side plate 3 as it returns. It is provided to prevent the strength from being lowered during assembly.
[0030]
Further, a flat stopper plate 18 is provided on the inner side of the wall portion arranged outside the long side plate 2 of the lower corner member 8 as shown by an enlarged arrow a in FIG. 2, and a notch 1 a for receiving the plate 18 is formed on both side surfaces of the bottom plate 1 (as shown by an enlarged arrow b). In addition, the stopper plate 18 may be L-shaped in section along the bottom plate). This stopper plate 18 prevents inward return in the state where the short side plate 3 is erected, and a protrusion 18a in which the edge of the side plate 3 projects from the end surface of the stopper plate 18 while rotating outward. As shown in FIG. 4, it is detented and held in a three-dimensional shape.
[0031]
Further, an extension portion 6a is formed at the lower portion of each corner portion of the upper side corner material 6 so as to extend to the lower side and cover the outside of the fold line 14, and this extension portion 6a provides an outer portion on the upper side of the side plates 2 and 3. The rotation to the direction is regulated, and the shape of the box in a three-dimensionally shaped state is accurately shaped, and at the same time, the shape retaining property at this part is secured.
[0032]
Next, the folding procedure of the folding box having the above configuration will be described with reference to FIG. From the three-dimensional modeling state shown in FIG. 3, first, as shown in FIG. 3A, the short side plate 3 is folded toward the inside of the upper side frame shape with the folding line 16 as a hinge. In this operation, the side plate 3 is pushed inward with a certain degree of strong force, and the protrusion 18a for shape retention is overcome and folded inward. It is assumed that the work at the site is performed by kicking or the like. In this state, since the function of standing the long side plate 2 in a straight line is lost, the folding lines 11, 12, and 14 are pressed by pressing the side surfaces inward as shown in FIG. As shown in (c), it is folded inward and finally flattened when pressed from above as shown in (c). By stacking and stacking in this state, the volume is reduced. Storage is possible. In order to form a box shape from the state of (c), the procedure may be reversed and the operation is simple as described above.
[0033]
FIG. 9 shows a second embodiment of the present invention. In this embodiment, a tab 17 for preventing biting is the same as that of the above-described embodiment except that a tab 17 is formed at one central position on both ends of the long side plate 2. In the present embodiment, since the short side plate 3 is provided at the center position where it bulges most outward, it is advantageous in preventing biting, and the folding line 12 provided at the center of the tab forming position is not provided. Since the cut portion may be a tab forming position, hinge resistance during folding can be reduced.
[0034]
FIG. 10 shows a third embodiment of the present invention. In this embodiment, the locking piece 20 that engages with each other at the intersecting position of the long side plate 2 and the short side plate 3 at the upper position of the tab 17 projecting in the center is the same as in the second embodiment. It differs from each of the embodiments described above in that it is attached by sonic welding and the lower corner material 8 is not provided.
[0035]
Both the locking pieces 20 are each made of a channel-shaped extruded or injection-molded body, and are fixed with the side plates 2 and 3 being sandwiched between them as shown by an enlarged white arrow c. And a bowl-shaped piece 20b having a U-shaped cross-section integrated with the side surface of the base 20a. In the box-making state, the ridge-like pieces 20b are engaged with each other to prevent the short side plate 3 from bulging. It has a structure. In addition, the notch is formed in the attachment position with respect to the short side plate 3 so that both ends of the short side plate 3 and the end edge of the engagement piece 20 are on the same line, and the engagement piece 20 is attached to this position.
[0036]
Further, the lower frame edge 21 of the bottom plate 1 and the lower frame edge 22 of the short side plate 3 are engaged with each other so that they can be held in a boxed state. That is, as shown in an enlarged view with a hollow arrow d, a recess 21b is formed on the inner side of the rising portion 21a provided at the edge of the lower frame edge 21 of the bottom plate 1, and further on the plate surface of the lower frame edge 21. A detent 21c is formed to protrude along the longitudinal direction. On the other hand, a recess 22a is formed on the outside of the lower edge of the lower frame edge 22 of the short side plate 3 so as to engage with the recess 21b along the longitudinal direction.
[0037]
Accordingly, when the box is made, when the lower end of the lower frame edge 22 of the short side plate 3 rotates as shown by an imaginary line in the drawing, it abuts against the protrusion 21c. 21b and 22a engage with each other in a bowl shape, and further rotation is restricted. In addition, when an external force is applied to push back the side plate 3 in the folding direction, the lower edge of the frame edge 22 hits the protrusion 21a and the return is prevented. Even when the lower corner material 8 is not present, the edge of the rising portion 21a of the lower frame edge 21 abuts on the lower side of the long side plate 2 so that the right angle positioning can be performed and the shape retainability can be maintained. it can.
[0038]
Next, FIGS. 11 and 12 show a fourth embodiment of the present invention, FIG. 11 is an exploded view, and FIG. 12 is an assembly view. This embodiment is the same as the third embodiment except that the tab 17 is omitted, and therefore the description thereof is omitted only by the reference numerals. However, what should be noted in the present embodiment is that, in the box-making state, the crossing portion of the long side plate 2 and the short side plate 3 is firmly engaged by the locking piece 20, and the bulges and Since the accompanying problems are eliminated, the tab itself can be omitted, and the corner portion is simplified in a straight line shape, which is preferable in appearance.
[0039]
Next, FIGS. 13 and 14 show a fifth embodiment which is a further development of the fourth embodiment, and in this embodiment, the locking piece 20 is provided at each corner portion so that the bulging phenomenon is caused. Furthermore, as shown in an enlarged view in part of FIG. 13, the male and female resins that engage with each other and engage with the base 20 a of the upper and lower locking pieces 20 provided on the long side plate 3. The point which provided the fasteners 30 and 31 differs from the said embodiment.
[0040]
That is, in the folded state, the long side plate 2 is folded in a square shape with the folding tip 2 as a hinge as shown in FIG. 14 (in the figure, the thickness and the like are exaggerated). However, due to the rebound resilience at the hinge position, a force to return to the original state is always applied, and if it remains as it is, it is lifted and the flatness at the time of folding cannot be maintained. If the folding line is not half-cut but heat melting is selected, the reaction force when the box is folded is even greater. In such a case, there is a concern that the storage performance of the box when folded may be difficult. Therefore, the male and female fasteners 30 and 31 are provided at the position of the base 20a of the locking piece 20, which is the closest position during folding, and the folded shape is forced by engaging (fitting) the fasteners with each other. This ensures the storage of the box.
[0041]
In this embodiment, the resin fastener is used as the joining means, but it can be structured so that it can be folded and held by male and female surface fasteners, and the attachment position with respect to the long side plate 2 can also be other than the folding line 12. It can arrange | position in an opposing position.
[0042]
As a method for forming the folding line described above, there is a method shown in FIGS. 15A and 15B in addition to the method shown in FIGS. In this method, the D1 portion along the fold line is cut all through the substrates a and b and the core c, and the entire cut line is formed, and the D2 portion between them is a ruled line for facilitating the crease. By making them continuous at a predetermined pitch and length, the folds also form a fold line with a continuous broken line (in this figure, in order to help understanding of the present invention, the width dimension of the entire cutting line D1 is It ’s exaggerated, but it ’s actually linear.) In this case, the rebound resilience of the hinge differs according to the length ratio (for example, every 3 cm) between the entire cutting line D1 and the ruled line D2, and when D1> D2, the resilience is small, but the durability is poor. In the opposite case, the impact resilience is high, but the durability is high. As the ruled line, in addition to a ruled line formed by normal pressure, a heat ruled line formed by heating and melting, a half-cut ruled line formed by making a cut in the longitudinal direction while leaving the outer substrate, and the like can be selected. Therefore, in this embodiment, the selection range of the hinge characteristics is widened depending on the application.
[0043]
In each of the above embodiments, a model box shape is used. However, the size, aspect ratio, depth, and the like are within a range in which a geometric dimension such as a folding dimension is possible according to a required dimension. Of course, various changes can be made.
[0044]
【The invention's effect】
As is apparent from the above description, the folding box according to the present invention has the advantage that the structure is simple, the number of parts is small, the folding and rising can be easily performed, and the assembled state is extremely robust.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing a component arrangement of a folding box according to a first embodiment of the present invention.
FIG. 2 is an exploded perspective view showing the mounting shape.
FIG. 3 is a perspective view showing the assembled state.
FIG. 4 is a partial side sectional view in the assembled state.
FIGS. 5A to 5C are perspective views showing a fold line break formation position, a non-formation position, and an arrangement thereof; FIGS.
FIGS. 6A and 6B are explanatory diagrams showing a folding line forming procedure by melting. FIGS.
FIG. 7 is a partial cross-sectional view showing an open / close shape using the same folding line as a hinge.
FIGS. 8A to 8C are perspective views showing a folding procedure of the folding box.
FIG. 9 is a perspective view showing a three-dimensional modeling state of the folding box in the second embodiment of the present invention.
FIG. 10 is a perspective view showing a three-dimensional modeling state of the folding box in the third embodiment of the present invention.
FIG. 11 is an exploded perspective view showing a component arrangement of a folding box according to a fourth embodiment of the present invention.
FIG. 12 is a perspective view showing the three-dimensional modeling state.
FIG. 13 is a perspective view showing a three-dimensional modeling state of a folding box according to a fifth embodiment of the present invention.
FIG. 14 is a half sectional view of the folding box in a folded state.
FIG. 15 is an explanatory view showing another embodiment of a method of forming a folding line.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Bottom plate 2 Long side plate 3 Short side plate 4, 5 Upper frame edge 6 Upper corner material 6a Lower extension piece 7 Bottom plate frame edge 8 Lower corner material 10 Lower frame edge 11, 12, 14, 16 Folding line (14, 16 Thermal melting V-shaped groove)
17 Tab for preventing biting 18 Stopper plate 18a Protrusion 20 Locking piece 20b Cage piece 21 Bottom plate side lower frame edge 21a Rising portion 21b Recessed portion 21c Detent for protrusion 22 Lower frame edge 22a of short side plate Recess 30, 31 Resin Fastener (joining means)
a, b Substrate c Core d Cut line e Non-cut line part D1 Full cut line D2 Ruled line

Claims (7)

二枚の基板間に中空コア材をサンドイッチ状に一体成形した段ボールをカットして得られた底板と、底板の両側に折曲げにより立設され長尺側側面部を構成する長尺側側板と、長尺側側板の前後開口部に配置される段ボール製の一対の短尺側側板と、両側板の上縁に嵌合されて枠組を構成する枠縁と、各枠縁が突合わされるコーナ部に嵌合されて縁枠を連結する4つの上部コーナ材とを備え、
前記各長尺側側板には上部、下部及び中央にヒンジとなる折畳み線が形成され、前記底面板側に向けてく字形に折畳み可能としたものであり、前記各短尺側側板の上部には折畳み線を形成し、縁枠の内側に向けて折畳み可能としたものであり、前記各側板の上縁を前記枠縁及びコーナ材により箱枠状に一体に組立てた状態で、各折畳み線をヒンジとして折畳むことにより、縁枠内に平坦化され、かつ折畳み線をヒンジとして、各側板を立ち上げることで箱形状に造形される折畳み箱において、
前記長尺側側板の中央に形成される折畳み線は、外側の基板を残して長手方向に切れ目を入れることにより外側の基板をヒンジとして折畳み展開可能にしたものであって、その両端部を所定の長さの非切れ目部位とし、
前記長尺側及び短尺側側板の上部に形成される折畳み線は、熱溶融により断面V字形に形成されたものであることを特徴とする折畳み箱。
A bottom plate obtained by cutting corrugated cardboard in which a hollow core material is integrally formed between two substrates in a sandwich shape, and a long side plate that is erected on both sides of the bottom plate and constitutes a long side surface portion; A pair of corrugated cardboard short side plates disposed in the front and rear openings of the long side plate, a frame edge fitted to the upper edges of both side plates to form a frame, and a corner portion where each frame edge abuts And four upper corner materials that are connected to each other and connect the edge frame,
Each of the long side plates is formed with a folding line as a hinge at the top, bottom and center, and can be folded into a square shape toward the bottom plate, and is folded at the top of each short side plate. A line is formed and can be folded toward the inside of the edge frame, and each folding line is hinged with the upper edge of each side plate being assembled into a box frame shape by the frame edge and corner material. In the folding box that is flattened in the edge frame and folded into a box shape by raising each side plate using the folding line as a hinge,
The fold line formed at the center of the long side plate is formed by making a cut in the longitudinal direction while leaving the outer substrate so that the outer substrate can be folded and unfolded as a hinge, and both ends thereof are predetermined. And a non-cut site of length
The folding line formed in the upper part of the said elongate side and the elongate side side board is formed in the cross-section V shape by heat melting, The folding box characterized by the above-mentioned.
前記長尺側側板の両側部には、箱端面より突出する短尺側側板の噛み込み防止用タブを一体に形成したことを特徴とする請求項1に記載の折畳み箱。2. The folding box according to claim 1, wherein tabs for preventing biting of the short side plate protruding from the box end surface are integrally formed on both side portions of the long side plate. 前記底板のコーナ部に嵌合されて各側板の立上げ形状を保持する4つの下部コーナ材を備え、下部コーナ材の内側に長尺側側板の内側に突出するストッパプレートを立ち上げ形成し、このストッパプレートの内側に突起を突出してなり、折畳み状態の短尺側側板を回動して立ち上げる際に、側板の端縁が前記突起を弾発的に乗越え、立上げ状態で突起により戻り止めされることを特徴とする請求項1又は2に記載の折畳み箱。Four lower corner members that are fitted to the corner portions of the bottom plate and hold the rising shape of each side plate are provided, and a stopper plate that protrudes inside the long side plate is formed on the inner side of the lower corner material. A protrusion protrudes inside the stopper plate, and when the folded short side plate is turned up and turned up, the edge of the side plate jumps over the protrusion elastically, and detents are stopped by the protrusion in the raised state. The folding box according to claim 1 or 2 , wherein the folding box is provided. 前記上部コーナ材のコーナ部下部に各側板の上部側端縁に当接する延長部を一体に設けたことを特徴とする請求項1〜のいずれかの項に記載の折畳み箱。The folding box according to any one of claims 1 to 3 , wherein an extension portion that is in contact with an upper edge of each side plate is integrally provided at a lower corner portion of the upper corner material. 前記長尺側側板の中央に形成される折畳み線をさけた位置において、長尺側側板の端縁とこれと交差する短尺側側板の端縁のそれぞれに互いに係合可能な係止部材を設けたことを特徴とする請求項1〜のいずれかの項に記載の折畳み箱。Locking members that can be engaged with each other are provided at the edge of the long side plate and the edge of the short side plate that intersects the edge of the long side plate at a position where the folding line formed at the center of the long side plate is avoided. The folding box according to any one of claims 1 to 4 , wherein the folding box is provided. 前記底板の端縁に設けた下部枠縁の外端縁に立ち上げ部を立設し、この立上げ部の内側に係合部を形成するとともに、下部枠縁の板面に戻り止め用の突起を突設する一方、前記短尺側側板の下部枠縁の下端縁外側に前記凹部に鈎形係合する係合部を形成したものであり、製箱状態で前記短尺側側板の下部枠縁が前記突起を弾発的に乗越えて前記係合部同士が鈎形係合するとともに、前記突起により戻り止めされることを特徴とする請求項1、2、または5に記載の折畳み箱。A rising portion is erected on the outer edge of the lower frame edge provided on the edge of the bottom plate, an engaging portion is formed inside the rising portion, and a detent is provided on the plate surface of the lower frame edge. While forming a protrusion, an engaging portion is formed on the outer side of the lower edge of the lower frame edge of the short side plate to engage with the recess, and the lower frame edge of the short side plate in a boxed state. 6. The folding box according to claim 1, wherein the engaging portion is elastically moved over the protrusions so that the engaging portions engage with each other in a hook shape and are detented by the protrusions. 前記長尺側側板の折畳み状態でその折畳み面同士を離接可能に接合する手段を設けたことを特徴とする請求項1〜のいずれかの項に記載の折畳み箱。The folding box according to any one of claims 1 to 6 , further comprising means for joining the folded surfaces so as to be detachable in a folded state of the long side plate.
JP2003031697A 2002-02-07 2003-02-07 Folding box Expired - Lifetime JP4324389B2 (en)

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