JP3992194B2

JP3992194B2 - buckle

Info

Publication number: JP3992194B2
Application number: JP2003129628A
Authority: JP
Inventors: 幹夫根津
Original assignee: Nifco Inc
Current assignee: Nifco Inc
Priority date: 2003-05-07
Filing date: 2003-05-07
Publication date: 2007-10-17
Anticipated expiration: 2023-05-07
Also published as: CN1550168A; KR100511434B1; TWI241171B; JP2004329571A; US20040221432A1; KR20040095616A; TW200513205A

Description

【０００１】
【発明の属する技術分野】
本発明は、紐状部材同士を着脱可能に連結するバックルのうち、特に雄部材及び雌部材からなるバックルに関する。より詳細には、係合状態から一定値以上の荷重（抜き力）により係合解除して、首や腕等の身体部分へ過剰な負荷を与えないようにしたものである。なお、本明細書で「紐状部材」とは帯、バンド、コード及びそれらの類似部材を含む広義なものである。
【０００２】
【従来の技術】
対象のバックルは、雄部材及び雌部材からなるもので、例えば、各種カード類を入れたカード入れや携帯機器を首に吊す紐状部材の着脱に使用されたり、眼鏡等の小物類を頭部に装着する紐状部材の着脱に使用されたり、衣服類における開口部の紐状部材同士を着脱可能に連結するようなときに使用される。このような用途では、例えば、雄・雌部材を介しループ状となっている紐状部材が何らかの原因で引っ掛かった場合に身体部分へ直接又は間接的に過剰な負荷を与えるため危険となる。このため、雄・雌部材同士の係合構造としては、所定係合力を維持して不用意に外れず、かつ、一定値以上の抜き力で係合解除するという相反する要件を充足しなければならない。なお、設計上は、雄部材及び雌部材が所定抜き力を受けたとき、破損して係合又は連結状態を解放する方式と、雄部材及び雌部材が正規の解除操作と同様にして係合力に抗し係合解除する方式とがある。前者では危険回避の上で有効となるものの最使用できない。後者では最使用可能であるが、所定の係合力を維持して前記抜き力のばらつきを如何に抑えるかが問題となる。
【０００３】
図７は後者の構造例として下記特許文献１に記載されたものを示している。同図のバックル（ネックストラップ）は、紐状部材６０の端部６０ａを取り付ける基部５１，５６と、互いに近づいて係合した状態から引き離し方向の一定値以上の抜き力で係合解除する被係合部５３及び係合部５７の一方をそれぞれ形成している雌部材５０及び雄部材５５からなる。ここで、雌部材５０は、後より前側に向かって取付孔５１ａ付きの基部５１と、被係合部５３付きの中間部分と、枠状入口５０ａを区画している先端部５２とから形成されている。基部５１には、紐状部材６０の対応端部６０ａが取付孔５１ａを迂回した状態で装着される。被係合部５３は、両外側へ通じた凹部形の開口として設けられている。雄部材５５は、後側の取付孔５６ａ付きの基部５６と、該基部５６から突出された対の係合部５７とから形成されている。両係合部５７は、基部５６から突出して相対的に細くなった弾性脚部５７ａの先端側に設けられており、同（ｂ）のごとく脚部５７ａ側より外側へ次第に張り出し量を増大する係合側斜面部５７ｂと、斜面部５ｂ７の頂点より次第に張り出し量を減じる案内側斜面部５７ｃとで形成されている。以上の構造では、両係合部５７が雌部材５０に対し入口５０ａから挿入される過程で脚部５７ａの弾性変位を伴って互いの間隔を縮小し、被係合部５３の開口に達した際に元の形状に復元して該開口に傾斜部５７ｂの下部分を係合する。この係合力は、被係合部５３の開口に対する各係合部５７の突出量に比例し、かつ、脚部５７ａの弾性変位度合いにより左右される。
【０００４】
【特許文献１】
実用新案登録第３０８６７２０号公報（図１〜図８）
【０００５】
【発明が解決しようとする課題】
上記バックルの要部は、被係合部５３の開口に対応して各係合部５７を左右対称形にし、かつ、脚部５７ａに対する斜面部５７ｂの角度ないしは勾配θの設定により、係合状態から引き離し方向の一定値以上の抜き力で係合解除しようとするものである。しかしながら、この構造では、環境温度差（例えば、室温として３０℃のときと−１０℃のとき）や、例えば、雌部材５０側を固定した状態で雄部材５５の紐状部材６０を引く速度及び引く方向により係合解除時の抜き力が大きく変化する。しかも、係合及び係合解除を繰り返すと、係合解除時の抜き力が比較的早く弱くなり易い。
【０００６】
本発明の目的は、以上のような問題を解消して、形態的に簡明かつ量産性を維持しながら、係合解除時における抜き力のばらつきを抑えて、抜き力をより一定値に近づけ易くすることにより、商品価値を向上することにある。
【０００７】
【課題を解決するための手段】
上記目的を達成するために、請求項１の発明は、図面の例で特定すると、紐状部材３の端部３ａを取り付ける装着部（１６及び１６ａ、２４及び２０ａ）と、互いに近づいて係合した状態から、引き離し方向の一定値以上の抜き力で係合解除する係合部２７及び被係合部１１ａの一方をそれぞれ形成している雄部材２及び雌部材１からなるバックルであって、前記係合部２７を含む対応部分と前記被係合部１１ａを含む対応部分との一方を、図５や図６の例のごとく他方より硬度の低い軟質樹脂部（図５や図６の斑点を付けた部分）により形成していることを特徴としている。
【０００８】
（工夫点等）以上の各バックルは、雄部材及び雌部材が樹脂製のモールド品であり、雄部材が雌部材内に差し込まれて係合部及び被係合部の係合を介し連結されて使用状態となる点、該係合が引き離し方向の一定値以上の荷重（抜き力）により弾性的に係合解除される点で従来品と同じくし、課題に挙げたような係合解除時における抜き力の値、つまり抜き力が製品毎にばらついたり温度変化や引き抜き荷重方向等によりばらつかないようしたものである。これは、使用態様において、紐状部材等が他の物品等に引っ掛かった場合に身体部分へ直接又は間接的に過剰な負荷、該負荷に起因する危険を回避するためである。本発明者らは、従来品の係合構造を調べてきた結果、文献１に挙げられるような係合部及び被係合部の形状設定だけでは前記した抜き力のばらつきを抑えることが不可能との結論に達し、更なる検討を重ねて本発明を完成した。すなわち、本発明の要部は、バックルが雄・雌部材の２物品からなる態様で、互いに近づけて係合、離間方向へ引っ張って係合解除するという係合構造において、係合部を含む対応部分及び被係合部を含む対応部分の一方を他方よりも硬度の低い軟質樹脂部で構成することにより、引き離し方向の荷重を加えたとき、軟質樹脂部が専ら変形して係合を解除させるものである。これは、従来品の場合に温度変化等により抜き力が大きくばらついたり破損し易くなるが、軟質部分が硬質部分に比べ低温時にも弾性特性ないしは撓み性を維持するため、前記した問題を解消する上で極めて有効となるからである。
【０００９】
また、請求項２は、前記雄部材及び雌部材の形状を形態例のものに特定しものであり、雌部材及び雄部材の各形状を単純化して成形型を共に簡易にできることに加え、雌部材側被係合部が係合解除用操作部を区画しているスリットの一部を利用し、又、雄部材側係合部が雌部材内への差し込み用片部にスリットにより区画形成されて両者共に弾性変位し易くなっているため、係合時及び係合解除時における過剰な負荷に起因した割れなどの破損の虞を防ぐことができる。これに対し、請求項３では、例えば、雄部材の片部が雌部材に対し差し込まれたり引き抜かれるときに、長溝と案内突起とのセンタリング作用によって雌部材内での幅方向の動きを規制し、それにより上記した引き方向による抜き力のばらつきを抑えるようにする。請求項４は、前記した軟質樹脂部が熱可塑性エラストマーからなるという特定であり、各種素材から最良な材質を選定したことに意義がある。該熱可塑性エラストマー（ＴＰＥ）は、常温ではゴム状弾性を持ち、高温では可塑化される性質のものであり、ポリオレフィン系（ＴＰＯ）、ウレタン系（ＴＰＵ）、ポリエステル系（ＴＰＥＥ）、ポリアミド系（ＴＰＡＥ）、アイオノマー（ＩＯ）等が挙げられる。この素材は、熱可塑性樹脂のうち、いわゆる線状構造やエンジニアリングプラスチックとしてバックル素材に多用されているポリアセタール（ＰＯＭ）、ポリアミド（ＰＡ）、ポリカーボネート（ＰＣ）等の硬質系の素材よりも高価である。そこで、発明形態としては、請求項４のように係合部及び被係合部を含む対応部分の一方にだけＴＰＥを用い、製造費増を抑えながら前記係合力と前記抜き力とを共に充足することが最も好ましい。
【００１０】
【発明の実施の形態】
本発明の好適な形態を添付図面に基づいて説明する。図１はバックルの雄・雌部材の概略外観図である。図２は該バックルの使用状態を示し、同（ａ）は上面図、（ｂ）は（ａ）を幅中間部で断面した図である。図３は雌部材の細部を示し、同（ａ）は上面図、図３（ｂ）は下面部、同（ｃ）は（ａ）を幅中間部で断面した図、同（ｄ）は（ｃ）のＡ−Ａ線断面図である。図４は雄部材の細部を示し、同（ａ）は上面図、同（ｂ）は（ａ）のＣ方向から見た側面図、同（ｃ）は下面図、同（ｄ）は（ａ）のＢ−Ｂ線断面図である。図５及び図６は変形例であり、図５（ａ）及び（ｂ）は図３（ａ），（ｃ）に対応した図、図６（ａ）及び（ｂ）は図４（ａ），（ｄ）に対応した図である。以下の説明では、バックル構造と使用例、変形例を述べた後、実施例を挙げて本発明の有用性を明らかにする。
【００１１】
（構造）形態のバックルは、例えば、上記したカード入れを首部に吊す紐状部材の着脱、小物類を頭部に装着する紐状部材の着脱、衣服開口部の紐状部材同士を着脱可能に連結する、つまり身回り用として設計されており、実寸が図面よりもかなり小さい雌部材１及び雄部材２からなる。雌部材１及び雄部材２は、後述する係合部及び被係合部の一方をそれぞれ有し、互いに近づけると係合し、かつ、離間方向へ引っ張ると係合解除する点、それぞれモールド品からなる点で従来品と同じ。異なる構成は、雌部材１と雄部材２との一方が従来と同様なポリアセタール等の硬質樹脂材からなり、他方が前記硬質樹脂材よりも硬度が低い軟質樹脂材からなる点と、次の雌部材１と雄部材２との具体的な形状において異なっている。なお、素材組合としては、雌部材１が硬質樹脂材で雄部材２が軟質樹脂材、雌部材１が軟質樹脂材で雄部材２が硬質樹脂材の何れかである。また、硬質樹脂材は従来と同じであり、軟質樹脂材は熱可塑性エラストマーが好ましい。
【００１２】
雌部材１は、図１〜３のごとく前後に貫通した略偏平筒形であり、内空間が上下壁１０ａ，１０ｂ及び両側壁１０ｃにより区画形成されている。上壁１０ａには、両側及び前側に位置した略コ形状のスリット１１が設けられている。該スリット１１は、係合解除用操作部１２を区画形成し、又、前側に位置したコ形の中間スリット部１１ａが凹部形の被係合部に設定されている。操作部１２は、コ形の両端の間に設けられた断面凹状の溝部１３により、該溝部１３の下側を薄くした薄肉ヒンジ部１４を形成し、該ヒンジ部１４を支点として上下に弾性揺動可能となっている。また、操作部１２の上面は、前側部分１２ｂが溝部１３と前後略中間との間の部分１２ａよりも上に突出されていて、係合解除操作を該前側部分１２ｂで行い易くする設定である。なお、上壁１０ａの内入口側は、外側に向かって開口高さを少し拡大するガイド用傾斜面１５として形成されている。下壁１０ｂには、後側の取付孔１６と、前後中間より若干前側に位置し、かつ、左右中間位置に案内突起１７が設けられている。取付孔１６は、下壁１０ｂの後側部分１６ｂを区画している。なお、符号１８は下壁１０ｂの両側付近に設けられた凹部である。両側壁１０ｃは、入口側の部分が少し欠如されていて、入口側から見ると、後側に窪んだ凹部１９に形成されている。
【００１３】
雄部材２は、図１及び図４のごとく雌部材１に対応した大きさで、後より前側に向かって、紐状部材３を装着する取付部２０と、雌部材１内に挿入される差込基部２１及び片部２２とからなる。取付部２０には取付孔２４が上下貫通して設けられている。取付孔２４は取付部２０を枠状にし、該枠状の後側部分２０ａを区画している。取付部２０と差込基部２１との間には、上に突出したストッパー部２３が設けられている。該ストッパー部２３は、雌部材１における上壁１０ａの挿入側端面形状に対応しており、雄部材２の雌部材２に対する差込量を規制する。差込基部２１は、雌部材１の入口側幅と略同寸であり、雌部材２の内空間に対し片部２２側より差し込まれると、前記両側の凹部１９と嵌合する。片部２２には、幅略中間で、前端より前後略中間位置まで延びる長溝２５と、上下貫通した略コ形状のスリット２６と、該スリット２６により区画された弾性係合部２７と、上面にあって両側に設けられた小突起２９とが設けられている。長溝２５は、前記案内突起１７に対応し、溝幅が案内突起１７の幅寸法より若干大きく設定されている。スリット２６は、片部両側付近及び差込基部２１付近に位置して、係合部２７を区画している。該係合部２７は、下面２８を少し欠肉して薄くなっていて、長溝２５及びスリット２６の存在により、該スリット２６の両端間に位置する部分２７ｃ（図４の（ｃ）を参照）を支点として上下に揺動可能になっている。また、係合部２７には、上記被係合部である中間スリット部１１ａに係脱する凸形の係合爪２７ａが設けられている。この係合爪２７ａは、弾性係合部２７のうち、図４（ｄ）のごとく前側よりスリット２６の中間スリット部に近づくに従って次第に上へ張り出す傾斜部２７ｂの頂点側に（中間スリット部より少し小さな幅寸法とし）形成されている。小突起２９は、すべり性を向上すると共に補強及び上下方向のがたつき防止用であるが省略してもよい。
【００１４】
（変形例）図５及び図６は上記雌部材１及び雄部材２を二色成形により一部を軟質樹脂部（斑点を付けた部分）に形成した例である。すなわち、図５は上記雌部材１に比べ、上壁１０ａのうち、薄肉ヒンジ部１４を含む係合解除用操作部１２及びスリット１１の中間スリット部１１ａより前側部分１０ｄ、つまり被係合部である中間スリット部１１ａを含む対応部分を軟質樹脂部（例えば、熱可塑性エラストマー）とし、それ以外の雌部材部分を硬質樹脂（例えば、ポリアセタール）とした例である。これに対し、図６は上記雄部材２に比べ、スリット２６で区画されている弾性係合部２７及び該係合部２７の後端までを軟質樹脂部（実施例ではＴＰＥ）とし、それ以外の雄部材部分を硬質樹脂（実施例ではＰＯＭ）とした例である。図５の雌部材１は、例えば、全体が硬質樹脂（ＰＯＭ等）で形成された雄部材２と組として用いられる。図６の雄部材２は、例えば、全体が硬質樹脂（ＰＯＭ等）で形成された雌部材１と組として用いられる。これは、硬質樹脂材（ＰＯＭ等）が軟質樹脂材（ＴＰＥ等）よりコスト的に安いため製造費を抑えるだけではなく、雌部材１及び雄部材１，２の両者、又は、係合部２７を含む対応部分及び被係合部である中間スリット部１１ａを含む対応部分の両者共に軟質樹脂材（ＴＰＥ等）にて形成すると、上記した所定係合力の値を維持し、かつ、上記した抜き力として低めの値を安定維持し難くなる傾向となるためである。
【００１５】
（使用例）以上の雌部材１及び雄部材２は、紐状部材３の対応端部３ａに同様な方法で装着される。すなわち、雌部材１の装着操作では、図２（ｂ）の例のごとく紐状部材３の対応端部３ａを雌部材１の後開口に入れ、取付孔１６を介し折り返すことにより後側部分１６ａを紐状部材３の対応部と端部３ａとの間に挟み込んだ後、紐状部材３の対応部と端部３ａとの重ね部を縫製又は溶着等で固定する。雄部材２の場合には、図２（ｂ）の例のごとく紐状部材３の対応端部３ａを雄部材２の上側から取付孔２４内に入れて折り返すことにより、後側部分２０ａを紐状部材３の対応部と端部３ａとの間に挟み込んだ後、紐状部材３の対応部と端部３ａとの重ね部を縫製又は溶着等で固定する。ここで、バックル使用形態としては、例えば、携帯機器類を首等の身体部分に吊す１本の紐状部材３の両端部３ａに雌・雄部材１，２を取り付ける態様と、洋服等の開口部を開閉する２本の紐状部材３を連結するような場合で、異なる紐状部材３の自由端部３ａに雌部材１と雄部材２を取り付ける態様とがあり、何れであってもよい。
【００１６】
図２は以上のバックルの使用態様である。この使用態様において、雌部材１及び雄部材２は、被係合部である中間スリット部１１ａに対し係合部２７の頂端側、つまり係合爪２７ａを入れて係合し、該係合力により連結状態を維持している。この状態では、前記した差込基部２１が凹部１９に嵌合していること、案内突起１７が長溝２５に位置していること、ストッパー部２３が上壁１０ａの挿入側端面に当接していることから、部材間のがたつきがなく、感触的には全体として一体ものとなっている。そして、前記係合は、操作部１２を下方向へ押圧操作して係合解除する以外に、雌部材１及び雄部材２が両側の紐状部材３０又は片側の紐状部材３０を介して引き離し方向に荷重を受けることにより係合解除される。この係合解除時の荷重を抜け力とする。この構造では、次のような工夫により、その抜け力を一定値以上、つまり該値を極力変動しない又は抜け力の値がばらつかないにしたものである。
【００１７】
第１に、形態的には、前記係合解除過程において、まず、弾性係合部２７が引き離し方向の荷重により図２（ｂ）の係合状態から、係合爪２７ａが中間スリット部１１ａを区画している対応内端面から応力を受け、該応力により係合部２７が前記した部分２７ｃを支点として下方へ揺動変位する。雄部材２は、この係合部２７の下向きへの変位により、中間スリット部１１ａに対する係合爪２７ａの係合を解除し、以後は雌部材上壁１ａの内面に圧接しながら雌部材１内から抜け出る。なお、正規の係合解除操作では、操作部１２を下方向へ押圧すると、上記と同様に係合部２７が部分２７ｃを支点として下方へ揺動変位し、該変位により係合爪２７ａも中間スリット部１１ａ内から外れる。
第２に、以上の係合構造では、前記引き離し方向の荷重が比較的ゆっくりと加わる場合と、瞬間かつ過大に加わるような場合とで係合解除時の抜け力がほとんで同じであり従来品の様な大きな変動がなくなる。同時に、後述する実施例から分かるよう使用温度による変動、引き抜き荷重方向による変動も従来品より数段小さく抑えることができる。これらは、係合構造として、上記した被係合部である中間スリット部１１ａと係合部２７の係合爪２７ａとの係合であり、これらが雌部材１及び雄部材２の左右中間部に位置していること、係合爪２７ａが板幅方向に形成され中間スリット部１１ａに対し係合部２７の上下方向への弾性変位により係脱すること、中間スリット部１１ａのスリット幅が操作部１２の弾性変位によっても微少に可変されること、雄部材２が係合部２７の中間に設けられた長溝２５と雌部材側の案内突起１７との嵌合によりセンタリングされていること、等の構成が共働して機能するためと推察される。
第３に、素材構成的には次の実施例の通りである。
【００１８】
【実施例】
以下の実施例は、上記抜き力が素材構成によってどの様に異なるかを検証したときのものである。ここでは、雌部材１及び雄部材２が共にポリアセタール（ＰＯＭ）の態様（以下、比較品という）と、雌部材１がＰＯＭで雄部材２が熱可塑性エラストマー（ＴＰＥ）の態様の例（以下、発明品という）、つまり同じ成形型を用いて素材だけを変更した例である。なお、ＰＯＭとしては商品名が東レデュポンデルリン５００Ｐ（硬度Ｄが８０）を用いた。ＴＰＥとしては東レデュポンハイトレル５５５７Ｍ（硬度Ｄが５５）を用いた。そして、同一成形型で、素材だけを変更した多数の雌・雄部材１，２を作製し、該雌・雄部材について次の方法で係合解除時の上記抜き力を計測して評価したものである。各評価値はバックルの１０個の平均値である。なお、各試験では、引っ張り試験機にて、図２（ｂ）に示すごとく雌部材１側の紐状部材３を固定部材５で押さえ、雄部材１側の紐状部材３を同図矢印方向へ１００ｍｍ／ｍｉｎの速度で引っ張って、上記抜き力（ニュートン）を測定した。この測定では各バックルを室温下に１時間放置した直後に行うようにした。
【００１９】
（実施例１）この試験は、比較品及び発明品を室温２０℃の環境で雌・雄部材の係合及び係合解除（紐状部材３０を引き離し方向へ強制的に引くことで係合解除する態様）を１００回繰り返したときの抜き力の変動を比較した例である。計測方法は、雌部材１側の紐状部材３を固定部材５で押さえ、雄部材１側の紐状部材３を真っ直ぐに荷重を加えて抜き力を測定した。この結果は、比較品が平均１３６．１Ｎ、発明品が平均２２．２Ｎであった。また、比較品は最大値が約１３９Ｎ、最小値が約８２Ｎであり、発明品は最大値が約２９．３Ｎ、最小値が約２０．４Ｎであった。以上の試験からは、上記抜き力として発明品の方が比較品より数段小さくなること、発明品の方が比較品より製品間のばらちきとしても小さく、又、１００回係脱した後の抜き力も安定していることが分かった。
【００２０】
（実施例２）この試験は、比較品及び発明品を室温２５℃の環境と、−１０℃（零下１０℃）の環境で使用したときで、上記抜き力（Ｎ）を比較したときのものである。計測方法は実施例１と同じである。この計測結果は次の通りである。２５℃の環境では、比較品が平均１３６．８Ｎ、発明品が平均２２．７Ｎであった。また、比較品は最大値が約１３９Ｎ、最小値が約８６Ｎであり、発明品は最大値が約２９．３Ｎ、最小値が約２０．９Ｎであった。これに対し、−１０℃の環境では発明品が全て正常に係脱したが、比較品のバックル１０個中、２個のバックルが雄部材の係合部で破損し測定不能となった（従って、比較品は８個での比較となる）。そして、この結果は、比較品が平均１４６Ｎ、発明品が平均２５．８Ｎであった。また、比較品では最大値が約１５６Ｎ、最小値が約１４３Ｎであり、発明品では最大値が約２８．０Ｎ、最小値が約２３．０Ｎであった。以上の試験からは、上記抜き力が発明品と比較品とで大きく異なるだけではなく、発明品の方が温度変化による変動も数段小さくなることが分かった。
【００２１】
（実施例３）この試験は、雌部材１側の紐状部材３を固定部材５で押さえ、雄部材１側の紐状部材３を図２（ａ）のごとく角度（θ＝１５度）で引き離し方向の荷重を加えたときの上記抜き力を比較したときのものである。なお、室温２５℃での使用である。この結果は、比較品が平均１４８Ｎ、発明品が平均２５Ｎであった。また、比較品では最大値が約１５６Ｎ、最小値が約９２Ｎであり、発明品では最大値が約３１Ｎ、最小値が約２１Ｎであった。この試験からは、上記抜き力が発明品と比較品とで大きく異なることと、発明品の方が引き抜き角度（１５度）による変動も充分抑えることができることが分かった。なお、以上の実施例１〜３の傾向は、上記した変形例として、例えば、雌部材１をＰＯＭで形成し、図６の雄部材２（係合部２７及び該係合部２７の後端までをＴＰＥで形成し、それ以外の部分をＰＯＭで形成した態様）でもほぼ同じ結果となった。
【００２２】
【発明の効果】
以上説明したとおり、本発明のバックルによれば、バックルが雄・雌部材からなる態様で、互いに近づけて係合、離間方向へ引っ張って係合解除するという係合構造において、請求項１の要部構成により、係合解除時における抜き力を製品間や温度並びに引き抜き角度等によるばらつきを抑えることができる。これにより、本発明品は、特に身回り用バックルとして、安全性に優れ、商品価値を向上できる。
【図面の簡単な説明】
【図１】本発明形態に係るバックルの雄・雌部材を示す概略外観図である。
【図２】上記雄・雌部材の係合を解除する引抜力を試験した際の図である。
【図３】上記バックルの雌部材単品の構成図である。
【図４】上記バックルの雄部材単品の構成図である。
【図５】上記雌部材の変形例を模式的に示す図である。
【図６】上記雄部材の変形例を模式的に示す図である。
【図７】従来のバックルの問題を説明するための図である。
【符号の説明】
１…雌部材（１１はスリット、１２は操作部、１４はヒンジ部）
２…雄部材（２０は取付部、２１は差込基部、２２は弾性片部）
１１ａ…中間スリット部（被係合部）
１６，２４…取付孔（装着部）
１７…案内突起
２３…ストッパー部
２５…長溝
２６…スリット
２７…係合部（２７ａは係合爪、２７ｂは傾斜部）[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a buckle made up of a male member and a female member, among buckles that detachably connect string-like members. More specifically, the engagement is released from the engaged state by a load (extraction force) of a certain value or more so that an excessive load is not applied to a body part such as a neck or an arm. In the present specification, the “string member” is a broad term including a band, a band, a cord, and similar members.
[0002]
[Prior art]
The target buckle is composed of a male member and a female member. For example, the buckle is used for putting a card containing various cards, attaching / detaching a string-like member that hangs a portable device around the neck, or wearing small items such as glasses on the head. It is used for attaching / detaching the string-like member to be attached to the garment, or for detachably connecting the string-like members of the openings in the clothes. In such an application, for example, when a string-like member in a loop shape is caught via a male / female member for some reason, it is dangerous because an excessive load is directly or indirectly applied to the body part. For this reason, the engagement structure between the male and female members must not satisfy the conflicting requirements of maintaining a predetermined engagement force so as not to be inadvertently disengaged and releasing the engagement with a pulling force of a certain value or more. Don't be. In terms of design, when the male member and the female member are subjected to a predetermined pulling force, they are broken to release the engaged or connected state, and the male member and the female member are engaged in the same manner as the normal release operation. There is a method of releasing the engagement against this. The former is effective for avoiding danger, but cannot be used most. The latter can be used most, but there is a problem of how to suppress a variation in the extraction force by maintaining a predetermined engagement force.
[0003]
FIG. 7 shows an example of the latter structure described in Patent Document 1 below. The buckle (neck strap) in the figure is engaged with the base portions 51 and 56 to which the end portion 60a of the string-like member 60 is attached, and is disengaged with a pulling force of a predetermined value or more in the pulling direction from the state of being close to each other and engaged. It consists of the female member 50 and the male member 55 which form one of the joint part 53 and the engaging part 57, respectively. Here, the female member 50 is formed from a base 51 with a mounting hole 51a toward the front side from the rear, an intermediate portion with an engaged portion 53, and a tip 52 that partitions the frame-shaped inlet 50a. ing. The base 51 is mounted with the corresponding end 60a of the string-like member 60 bypassing the attachment hole 51a. The engaged portion 53 is provided as a recessed opening that leads to both outer sides. The male member 55 is formed of a base portion 56 with a rear mounting hole 56 a and a pair of engaging portions 57 protruding from the base portion 56. Both engaging portions 57 are provided on the distal end side of the elastic leg portion 57a which protrudes from the base portion 56 and becomes relatively thin, and the amount of protrusion gradually increases outward from the leg portion 57a side as shown in FIG. The engaging side inclined surface portion 57b and the guide side inclined surface portion 57c that gradually reduces the amount of protrusion from the apex of the inclined surface portion 5b7 are formed. In the structure described above, the distance between the engaging portions 57 is reduced with the elastic displacement of the leg portions 57a in the process in which both the engaging portions 57 are inserted into the female member 50 from the inlet 50a, and the opening of the engaged portion 53 is reached. At this time, the original shape is restored and the lower portion of the inclined portion 57b is engaged with the opening. This engaging force is proportional to the amount of protrusion of each engaging portion 57 with respect to the opening of the engaged portion 53, and depends on the degree of elastic displacement of the leg portion 57a.
[0004]
[Patent Document 1]
Utility Model Registration No. 3086720 (FIGS. 1-8)
[0005]
[Problems to be solved by the invention]
The main part of the buckle is in an engaged state by making each engaging portion 57 symmetrical with respect to the opening of the engaged portion 53 and setting the angle or gradient θ of the inclined surface portion 57b with respect to the leg portion 57a. The engagement is to be released with a pulling force greater than a certain value in the pulling direction. However, in this structure, the environmental temperature difference (for example, when the room temperature is 30 ° C. and −10 ° C.), for example, the speed of pulling the string-like member 60 of the male member 55 while the female member 50 side is fixed and The pulling force at the time of disengagement varies greatly depending on the pulling direction. Moreover, if engagement and disengagement are repeated, the pulling force at the time of disengagement tends to weaken relatively quickly.
[0006]
The object of the present invention is to solve the above-mentioned problems, while maintaining morphological simplicity and mass productivity, suppressing variations in the extraction force at the time of disengagement, and making it easier to bring the extraction force closer to a constant value. This is to improve the product value.
[0007]
[Means for Solving the Problems]
To achieve the above object, the invention of claim 1, when a particular example of the drawings, the mounting portion for attaching the end portion 3a of the string-shaped member 3 and (16 and 16a, 24 and 20a), close to each other engaging A buckle comprising a male member 2 and a female member 1 forming one of an engaging portion 27 and an engaged portion 11a, respectively, which are disengaged by a pulling force equal to or greater than a certain value in the pulling direction from the combined state. , One of the corresponding portion including the engaging portion 27 and the corresponding portion including the engaged portion 11a is made of a soft resin portion (in FIGS. 5 and 6) having a lower hardness than the other as in the examples of FIGS. It is characterized by being formed by a spotted portion).
[0008]
(Ingenious points, etc.) In each of the above buckles, the male member and the female member are molded products made of resin, and the male member is inserted into the female member and connected through the engagement of the engaging portion and the engaged portion. In the same way as the conventional product in that it is in a use state, and the engagement is released elastically by a load (pulling force) greater than a certain value in the direction of separation, when releasing the engagement as mentioned in the problem In this case, the value of the pulling force, i.e., the pulling force does not vary from product to product or varies due to temperature change, pulling load direction, or the like. This is for avoiding an excess load directly or indirectly on the body part and a danger caused by the load when the string-like member or the like is caught on another article or the like in the usage mode. As a result of examining the engagement structure of the conventional product, the present inventors cannot suppress the variation in the above-described extraction force only by setting the shapes of the engaging portion and the engaged portion as described in Document 1. The present invention was completed through further studies. That is, the main part of the present invention, in a manner that the buckle consists of two articles of the male and female member, the engagement, the engagement structure that disengaged by pulling the detaching direction close together, corresponds comprising an engagement portion By configuring one of the part and the corresponding part including the engaged part with a soft resin part having a lower hardness than the other, the soft resin part is exclusively deformed to release the engagement when a load in the pulling direction is applied. Is. This is because in the case of the conventional product, the pulling force greatly varies or breaks easily due to a temperature change or the like, but the soft part maintains the elastic characteristics or the flexibility even at a low temperature as compared with the hard part. This is because the above is extremely effective.
[0009]
Further, according to claim 2, wherein is intended to identify the shape of the male and female members to those of embodiment, in addition to being able to mold to simplify the shape of the female member and the male member easily both female The member-side engaged portion uses a part of the slit that divides the disengaging operation portion, and the male member-side engaging portion is defined by a slit in the piece for insertion into the female member. Since both are easily elastically displaced, it is possible to prevent the possibility of breakage such as cracks due to excessive load during engagement and disengagement. On the other hand, in claim 3 , for example, when a piece of the male member is inserted into or extracted from the female member, the movement in the width direction in the female member is regulated by the centering action of the long groove and the guide projection. Thereby, the variation in the pulling force due to the pulling direction is suppressed. The fourth aspect is specific that the soft resin portion is made of a thermoplastic elastomer, and is meaningful in that the best material is selected from various materials. The thermoplastic elastomer (TPE) has a rubber-like elasticity at room temperature and is plasticized at a high temperature, and is polyolefin (TPO), urethane (TPU), polyester (TPEE), polyamide ( TPAE), ionomer (IO) and the like. This material is more expensive than rigid materials such as polyacetal (POM), polyamide (PA), and polycarbonate (PC), which are frequently used as buckle materials as thermoplastic structures among thermoplastic resins. . Therefore, as an aspect of the invention, the TPE is used only for one of the corresponding parts including the engaging part and the engaged part as in claim 4 to satisfy both the engaging force and the pulling force while suppressing an increase in manufacturing cost. Most preferably.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a schematic external view of a male / female member of a buckle. FIG. 2 shows the use state of the buckle. FIG. 2A is a top view, and FIG. 2B is a cross-sectional view of FIG. 3A shows details of the female member, FIG. 3A is a top view, FIG. 3B is a bottom surface, FIG. 3C is a cross-sectional view of FIG. It is AA sectional view taken on the line of c). 4A and 4B show details of the male member, wherein FIG. 4A is a top view, FIG. 4B is a side view seen from the direction C of FIG. 4A, FIG. 4C is a bottom view, and FIG. It is a BB line sectional view of). FIGS. 5 and 6 are modified examples, FIGS. 5A and 5B correspond to FIGS. 3A and 3C, and FIGS. 6A and 6B are FIGS. , (D). In the following description, after describing the buckle structure, usage examples, and modifications, the usefulness of the present invention will be clarified by giving examples.
[0011]
The (structure) form buckle can, for example, attach and detach a string-like member that hangs the card case above the neck, attach and detach a string-like member that attaches small items to the head, and attach and detach the string-like members at the clothing opening. It consists of a female member 1 and a male member 2 which are designed to be connected, that is, for personal use and whose actual size is considerably smaller than that of the drawing. Each of the female member 1 and the male member 2 has one of an engaging portion and an engaged portion, which will be described later, and is engaged when it comes close to each other and disengaged when pulled in the separating direction. This is the same as the conventional product. A different structure is that one of the female member 1 and the male member 2 is made of a hard resin material such as polyacetal similar to the conventional one, and the other is made of a soft resin material having a hardness lower than that of the hard resin material. The specific shapes of the member 1 and the male member 2 are different. As the material combination, the female member 1 is a hard resin material, the male member 2 is a soft resin material, the female member 1 is a soft resin material, and the male member 2 is a hard resin material. The hard resin material is the same as the conventional one, and the soft resin material is preferably a thermoplastic elastomer.
[0012]
The female member 1 has a substantially flat cylindrical shape penetrating in the front-rear direction as shown in FIGS. 1 to 3, and the inner space is defined by the upper and lower walls 10a and 10b and the side walls 10c. The upper wall 10a is provided with substantially U-shaped slits 11 located on both sides and the front side. The slit 11 defines a disengagement operation portion 12, and a U-shaped intermediate slit portion 11 a located on the front side is set as a recessed engagement portion. The operation portion 12 is formed by a groove portion 13 having a concave cross section provided between both ends of the U-shape to form a thin hinge portion 14 having a thin lower side of the groove portion 13 and elastically swinging up and down with the hinge portion 14 as a fulcrum. It is possible to move. Further, the upper surface of the operation portion 12 is set so that the front portion 12b protrudes above the portion 12a between the groove portion 13 and the front and rear substantially middle so that the engagement release operation can be easily performed by the front portion 12b. . Note that the inner entrance side of the upper wall 10a is formed as a guide inclined surface 15 that slightly increases the opening height toward the outside. The lower wall 10b is provided with a rear mounting hole 16 and a guide protrusion 17 that is located slightly forward of the front and rear middle and at the middle of the left and right. The mounting hole 16 defines the rear portion 16b of the lower wall 10b. Reference numeral 18 denotes a recess provided near both sides of the lower wall 10b. The both side walls 10c are formed in the recesses 19 that are recessed to the rear side when viewed from the entrance side, with the entrance side portion being slightly missing.
[0013]
The male member 2 has a size corresponding to the female member 1 as shown in FIGS. 1 and 4, and is attached to the female member 1 from the mounting portion 20 for attaching the string-like member 3 toward the front side from the rear. It consists of a recessed base 21 and a piece 22. A mounting hole 24 is provided in the mounting portion 20 so as to penetrate vertically. The mounting hole 24 forms the mounting portion 20 in a frame shape and defines the frame-shaped rear portion 20a. A stopper portion 23 protruding upward is provided between the attachment portion 20 and the insertion base portion 21. The stopper portion 23 corresponds to the shape of the insertion-side end surface of the upper wall 10a in the female member 1, and restricts the amount of insertion of the male member 2 into the female member 2. The insertion base portion 21 is substantially the same size as the inlet side width of the female member 1. When the insertion base portion 21 is inserted into the inner space of the female member 2 from the one portion 22 side, the insertion base portion 21 is fitted to the concave portions 19 on both sides. The piece portion 22 has an approximately middle width, a long groove 25 extending from the front end to a substantially middle position in the front and rear, a substantially U-shaped slit 26 penetrating vertically, an elastic engagement portion 27 defined by the slit 26, and an upper surface. There are small projections 29 provided on both sides. The long groove 25 corresponds to the guide protrusion 17, and the groove width is set to be slightly larger than the width dimension of the guide protrusion 17. The slits 26 are located in the vicinity of both sides of the one part and in the vicinity of the insertion base 21 to define the engaging part 27. The engaging portion 27 is thinned by slightly thinning the lower surface 28. Due to the presence of the long groove 25 and the slit 26, a portion 27c positioned between both ends of the slit 26 (see FIG. 4C). It can swing up and down with fulcrum as a fulcrum. The engaging portion 27 is provided with a convex engaging claw 27a that engages with and disengages from the intermediate slit portion 11a that is the engaged portion. This engaging claw 27a is located on the apex side of the inclined portion 27b that gradually protrudes upward from the elastic engaging portion 27 as it approaches the intermediate slit portion of the slit 26 as shown in FIG. 4 (d) (from the intermediate slit portion). A little smaller width). The small protrusions 29 are used for improving the sliding property and for reinforcing and preventing rattling in the vertical direction, but may be omitted.
[0014]
(Modification) FIGS. 5 and 6 are examples in which the female member 1 and the male member 2 are partially formed into a soft resin portion (a spotted portion) by two-color molding. That is, FIG. 5 is a front side portion 10d of the disengaging operation portion 12 including the thin hinge portion 14 and the intermediate slit portion 11a of the slit 11 in the upper wall 10a as compared with the female member 1, that is, the engaged portion. This is an example in which a corresponding portion including a certain intermediate slit portion 11a is a soft resin portion (for example, a thermoplastic elastomer), and the other female member portion is a hard resin (for example, polyacetal). On the other hand, in FIG. 6, compared with the male member 2, the elastic engagement portion 27 partitioned by the slit 26 and the rear end of the engagement portion 27 are soft resin portions (in the embodiment, TPE), and the others This is an example in which the male member portion is made of hard resin (POM in the embodiment). The female member 1 in FIG. 5 is used, for example, as a pair with the male member 2 formed entirely of hard resin (POM or the like). The male member 2 in FIG. 6 is used, for example, as a pair with the female member 1 formed entirely of hard resin (POM or the like). This is because not only the hard resin material (POM or the like) is cheaper than the soft resin material (TPE or the like) but also the manufacturing cost is suppressed, and both the female member 1 and the male members 1 and 2, or the engaging portion 27. When the corresponding portion including the intermediate slit portion 11a, which is the engaged portion, is formed of a soft resin material (TPE or the like), the above-described predetermined engagement force value is maintained and the above-described extraction is performed. This is because it tends to be difficult to stably maintain a low value as a force.
[0015]
(Usage example) The female member 1 and the male member 2 described above are attached to the corresponding end portion 3a of the string-like member 3 in the same manner. That is, in the mounting operation of the female member 1, as shown in the example of FIG. 2B, the corresponding end portion 3a of the string-like member 3 is placed in the rear opening of the female member 1 and folded back through the attachment hole 16 to return the rear portion 16a. Is sandwiched between the corresponding portion of the string-like member 3 and the end portion 3a, and then the overlapping portion of the corresponding portion of the string-like member 3 and the end portion 3a is fixed by sewing or welding. In the case of the male member 2, as shown in the example of FIG. 2 (b), the corresponding end portion 3 a of the string-like member 3 is inserted into the attachment hole 24 from the upper side of the male member 2 and folded, whereby the rear portion 20 a is strapped. After being sandwiched between the corresponding portion of the member 3 and the end portion 3a, the overlapping portion of the corresponding portion of the string-like member 3 and the end portion 3a is fixed by sewing or welding. Here, as a use form of the buckle, for example, a mode in which the female / male members 1 and 2 are attached to both end portions 3a of one string-like member 3 that suspends portable devices on a body part such as a neck, and an opening such as clothes There is a mode in which the female member 1 and the male member 2 are attached to the free end portions 3a of different string-like members 3 in the case where two string-like members 3 that open and close the portion are connected, and either may be used. .
[0016]
FIG. 2 shows how the above buckle is used. In this usage mode, the female member 1 and the male member 2 are engaged with the intermediate slit portion 11a, which is an engaged portion, by engaging the top end side of the engaging portion 27, that is, by inserting the engaging claw 27a. Stay connected. In this state, the aforementioned insertion base 21 is fitted in the recess 19, the guide projection 17 is positioned in the long groove 25, and the stopper 23 is in contact with the insertion side end surface of the upper wall 10a. For this reason, there is no rattling between the members, and the touch is integrated as a whole. The engagement is performed by pressing the operating portion 12 downward to release the engagement, and the female member 1 and the male member 2 are separated via the string-like members 30 on both sides or the string-like members 30 on one side. The engagement is released by receiving a load in the direction. The load at the time of releasing the engagement is defined as a release force. In this structure, the following force is used to make the removal force not less than a certain value, that is, the value does not fluctuate as much as possible or the value of the removal force does not vary.
[0017]
First, morphologically, in the disengagement process, first, the engagement claw 27a moves the intermediate slit portion 11a from the engagement state shown in FIG. Stress is received from the corresponding inner end face that is partitioned, and the engaging portion 27 is oscillated and displaced downward with the portion 27c as a fulcrum by the stress. The male member 2 releases the engagement of the engagement claw 27a with respect to the intermediate slit portion 11a due to the downward displacement of the engagement portion 27, and thereafter pressurizes with the inner surface of the female member upper wall 1a. Get out of. In the normal disengagement operation, when the operation portion 12 is pressed downward, the engagement portion 27 swings downward with the portion 27c as a fulcrum in the same manner as described above. It comes off from the inside of the slit part 11a.
Secondly, in the above engagement structure, the release force at the time of disengagement is almost the same between the case where the load in the pulling-off direction is applied relatively slowly and the case where the load is applied instantaneously and excessively. The big fluctuation like At the same time, as can be seen from the examples described later, the fluctuation due to the operating temperature and the fluctuation due to the direction of the pulling load can be suppressed to be several steps smaller than the conventional product. These are engagements of the intermediate slit portion 11a, which is the above-described engaged portion, and the engagement claw 27a of the engagement portion 27 as an engagement structure, and these are the left and right intermediate portions of the female member 1 and the male member 2. The engaging claw 27a is formed in the plate width direction and is engaged with and disengaged from the intermediate slit portion 11a by the elastic displacement of the engaging portion 27 in the vertical direction, and the slit width of the intermediate slit portion 11a is operated. It can be slightly changed by the elastic displacement of the portion 12, the male member 2 is centered by the fitting of the long groove 25 provided in the middle of the engaging portion 27 and the guide projection 17 on the female member side, etc. It is assumed that the structure of
Third, the material composition is as in the following embodiment.
[0018]
【Example】
In the following examples, it is verified how the above-mentioned extraction force varies depending on the material configuration. Here, both the female member 1 and the male member 2 are in the form of polyacetal (POM) (hereinafter referred to as a comparative product), and the female member 1 is in the POM and the male member 2 is in the thermoplastic elastomer (TPE). This is an example in which only the material is changed using the same mold. As the POM, Toray DuPont Delrin 500P (hardness D is 80) was used. As TPE, Toray DuPont Hytrel 5557M (hardness D is 55) was used. Then, a large number of female / male members 1 and 2 having only the material changed were produced with the same mold, and the above-mentioned pulling force at the time of disengagement was measured and evaluated for the female / male members by the following method. It is. Each evaluation value is an average value of 10 buckles. In each test, as shown in FIG. 2B, the string-like member 3 on the female member 1 side is pressed by the fixing member 5 and the string-like member 3 on the male member 1 side is pressed in the direction of the arrows. The pulling force (Newton) was measured by pulling at a speed of 100 mm / min. This measurement was performed immediately after each buckle was left at room temperature for 1 hour.
[0019]
(Example 1) In this test, the comparison product and the invention product were engaged and disengaged between the female and male members in an environment at room temperature of 20 ° C (disengagement by forcibly pulling the string-like member 30 in the separating direction). It is the example which compared the fluctuation | variation of the drawing force when repeating the aspect which carries out 100 times. In the measurement method, the string-like member 3 on the female member 1 side was pressed by the fixing member 5, and a load was applied to the string-like member 3 on the male member 1 side to measure the pulling force. As a result, the average of comparative products was 136.1N, and the average of invention products was 22.2N. The comparative product had a maximum value of about 139N and a minimum value of about 82N, and the invention product had a maximum value of about 29.3N and a minimum value of about 20.4N. From the above test, the inventive product is several times smaller than the comparative product as the above-mentioned pulling force, and the inventive product is smaller than the comparative product in terms of variation between products. It was found that the pulling force of the was stable.
[0020]
(Example 2) This test was conducted when the above-mentioned removal force (N) was compared when the comparative product and the invention product were used in an environment at a room temperature of 25 ° C and an environment of -10 ° C (10 ° C under zero). It is. The measurement method is the same as in the first embodiment. The measurement results are as follows. In the environment of 25 ° C., the average of the comparative products was 136.8 N, and the average of the invention products was 22.7 N. Further, the comparative product had a maximum value of about 139 N and a minimum value of about 86 N, and the invention product had a maximum value of about 29.3 N and a minimum value of about 20.9 N. On the other hand, in the environment of −10 ° C., all the invention products were normally engaged / disengaged, but out of 10 comparative buckles, 2 buckles were damaged at the engaging portion of the male member, and measurement was impossible (accordingly). The comparison product is a comparison with 8 pieces). As a result, the average of the comparative products was 146 N and the average of the invention products was 25.8 N. In the comparative product, the maximum value was about 156 N and the minimum value was about 143 N, and in the invention product, the maximum value was about 28.0 N and the minimum value was about 23.0 N. From the above test, it was found that not only the above-mentioned pulling force is greatly different between the inventive product and the comparative product, but also the inventive product has several steps less fluctuation due to temperature change.
[0021]
(Example 3) In this test, the string-like member 3 on the female member 1 side is pressed by the fixing member 5, and the string-like member 3 on the male member 1 side is held at an angle (θ = 15 degrees) as shown in FIG. This is a comparison of the pulling force when a load in the pulling direction is applied. In addition, it is used at room temperature of 25 ° C. As a result, the average of comparison products was 148N, and the average of invention products was 25N. In the comparative product, the maximum value was about 156 N and the minimum value was about 92 N, and in the invention product, the maximum value was about 31 N and the minimum value was about 21 N. From this test, it was found that the above-mentioned pulling force is greatly different between the inventive product and the comparative product, and that the inventive product can sufficiently suppress the variation due to the drawing angle (15 degrees). In addition, as for the tendency of the above Examples 1-3, as an above-described modification, for example, the female member 1 is formed of POM, and the male member 2 (the engaging portion 27 and the rear end of the engaging portion 27 in FIG. The results were almost the same in the case of forming up to TPE and forming the other parts with POM.
[0022]
【The invention's effect】
As described above, according to the buckle of the present invention, in the aspect in which the buckle is composed of male and female members, the engagement structure in which the buckle is brought into engagement with each other and pulled in the separation direction to be disengaged, the essential part of claim 1 is provided. Due to the configuration of the parts, it is possible to suppress variations in the pulling force at the time of disengagement between products, temperature, pulling angle and the like. Thereby, this invention product is excellent in safety | security as a buckle for personal use, and can improve a commercial value.
[Brief description of the drawings]
FIG. 1 is a schematic external view showing a male / female member of a buckle according to an embodiment of the present invention.
FIG. 2 is a diagram when a pulling force for releasing the engagement between the male and female members is tested.
FIG. 3 is a configuration diagram of a single female member of the buckle.
FIG. 4 is a configuration diagram of a single male member of the buckle.
FIG. 5 is a diagram schematically showing a modified example of the female member.
FIG. 6 is a view schematically showing a modification of the male member.
FIG. 7 is a diagram for explaining a problem of a conventional buckle.
[Explanation of symbols]
1 ... Female member (11 is a slit, 12 is an operation part, 14 is a hinge part)
2 ... Male member (20 is a mounting portion, 21 is an insertion base, 22 is an elastic piece)
11a: Intermediate slit (engaged part)
16, 24 ... Mounting hole (mounting part)
17 ... Guide protrusion 23 ... Stopper part 25 ... Long groove 26 ... Slit 27 ... Engagement part (27a is an engagement claw, 27b is an inclined part)

Claims

One of an engagement portion and an engaged portion that can be disengaged by a pulling force equal to or greater than a predetermined value in the pulling direction from a state where the attachment portion to which the end portion of the string-like member is attached and the engagement portion approach each other are formed. A buckle comprising a male member and a female member,
One of the corresponding part including the engaging part and the corresponding part including the engaged part is formed of a soft resin part having a lower hardness than the other.

2. The disengaging operation portion provided on the upper wall that defines the inner space and defined by the U-shaped slit, and the middle of the U-shape that constitutes the slit. The male member is partitioned by a piece portion inserted into the inner space of the female member and a U-shaped slit in a part of the piece portion. And the engagement portion that engages with the engaged portion and releases the engagement by the pressing force of the operation portion.

A long groove provided on a piece of the male member and extending rearward from the tip of the piece; and a long groove provided on the lower wall of the female member in the process of inserting the piece into the internal space of the female member. The buckle according to claim 2 , further comprising a guide protrusion that is positioned inside and centers the male member with respect to the female member.

The buckle whose soft resin part of Claim 1 is a thermoplastic elastomer.