JP2004270721A

JP2004270721A - Screw and mounting structure using the screw

Info

Publication number: JP2004270721A
Application number: JP2003058469A
Authority: JP
Inventors: Hiroyuki Onuma; 博幸大沼
Original assignee: Sony Corp
Current assignee: Sony Corp
Priority date: 2003-03-05
Filing date: 2003-03-05
Publication date: 2004-09-30

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screw easily engaging an engaging part at a tip of a rotating tool to a engaging groove in a head part of the screw, even in a case where the head part of the screw cannot be seen. <P>SOLUTION: The screw comprises: a shaft part 14 in which a male screw is formed; the head part 16 disposed at an end part of a shaft part 14; and the engaging groove 18 formed in the head part. A recess part 20 is formed in the head part 16 coaxially with the head part 16. The recess part 20 is formed of an opening part 22, a guide face 24 and a bottom face 26. The opening part 22 is formed in an upper face 1602 of the head part 16 so that a size of the opening part is as large as the size of an approximately whole upper face 1602. The guide face 24 is formed continuously to the opening part 22, is extended in a ring-like shape, and has inclinations so that an area of the opening part 22 becomes small from an upper face 1602 of the head part 16 toward the shaft part 14. The bottom face 26 is positioned inside a lower end of the guide face 24, and the engaging groove 18 is formed in the bottom face 26. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、ねじと、ねじを用いた取り付け構造に関する。
【０００２】
【従来の技術】
近年、地球環境保全の観点から資源のリサイクル運動が広く行われつつある。
そして、弱電業界を含んだ各種の業界でも、材料のリサイクルの見直しがなされ、リサイクルするために製品を如何に簡単に分解できるようにするかが重要な設計要素の一つとなっている。
一方、テレビなどの電気製品では、その筐体は意匠上の都合により、筐体の奥深くに配置した小ねじにより組み立てられる場合が多い。
このような場合、小ねじは、深いざぐりの底部に配設されてその頭部が外部から視認できず、そのため、ドライバーなどの先端の係合部をねじの頭部の係合溝に係合し難く、回収されたテレビなどの電気製品の分解作業を効率良く行えない不具合があった。
そこで、ざぐりを、その底部に至るにつれて内径が次第に小さくなる円錐面で形成し、この円錐面によりドライバーなどの先端の係合部を導くことも提案されているが、依然としてドライバーなどの係合部をねじの頭部の係合溝に係合し難い（例えば、特許文献１参照）。
【０００３】
【特許文献１】
特開２０００−３１２３２１号公報
【０００４】
【発明が解決しようとする課題】
これは、多くの場合、小ねじの頭部は半球状に形成されているため、係合溝から外れるとドライバーの係合部は小ねじの頭部によって係合溝から外れる方向に案内されてしまい、ドライバーの係合部が小ねじの頭部の係合溝に入り難いことが原因となっている。
また、六角ボルトが筐体の奥深くに配置され、頭部が外部から視認できない場合にも、ソケットレンチの先端の正六角形孔状の係合部を前記頭部に係合させ難い不具合がある。
本発明は前記事情に鑑み案出されたものであって、本発明の目的は、ねじの頭部が視認できない場合であっても、回転用工具の先端の係合部をねじの頭部の係合溝に簡単に係合でき、また、回転用工具の先端の係合部を六角ボルトの頭部に簡単に係合できるようにしたねじおよびねじを用いた取り付け構造を提供することにある。
【０００５】
【課題を解決するための手段】
前記目的を達成するため本発明は、雄ねじが形成された軸部と、前記軸部の端部に前記軸部と同軸上で前記軸部の断面よりも大きい断面で設けられた頭部と、前記頭部に設けられた回転用の係合溝とを有するねじであって、前記頭部に、前記頭部と同軸上に凹部が設けられ、前記凹部は、前記頭部の上面のほぼ全域にわたって開口する開口部と、前記開口部に連なり該開口部から前記軸部に近づくにつれて前記開口部の面積を次第に小さくするように傾斜しつつ延在する環状の案内面と、前記案内面の下端の内側に位置する底面とで形成され、前記係合溝は前記凹部の底面に形成されていることを特徴とする。
また、本発明は、雄ねじが形成された軸部と、前記軸部の端部に前記軸部よりも大きい断面の正六角形で形成された頭部とを有する六角ボルトであって、前記頭部の上面に、前記頭部と同軸上に凸部が設けられ、前記凸部の外周面は、前記頭部の上面において前記凸部の断面が前記頭部の上面のほぼ全域にわたって広がると共に前記上面から離れるにつれて前記断面が次第に小さくなるように傾斜しつつ延在する環状の案内面で形成されていることを特徴とする。
また、本発明は、雄ねじが形成された軸部と、前記軸部の端部に前記軸部と同軸上で前記軸部の断面よりも大きい断面で設けられた頭部と、前記頭部に設けられた回転用の係合溝とを有するねじと、前記ねじの頭部を収容するざぐりが設けられると共に前記ざぐりの底面に前記ねじの軸部を挿通させる挿通孔が前記ざぐりと同軸上に設けられた締結部とを備え、前記ざぐりに前記頭部を収容して頭部の下面を前記ざぐりの底面に係止し、回転用工具の軸部の先端の係合部を前記係合溝に係合させて回転用工具によりねじを回転させ、前記挿通孔に挿通させた前記軸部の雄ねじを、前記締結部を取り付けるべき相手方の雌ねじに螺合させることで前記締結部を取り付ける構造であって、前記頭部に、前記頭部と同軸上に凹部が設けられ、前記凹部は、前記頭部の上面のほぼ全域にわたって開口する開口部と、前記開口部に連なり前記頭部の上面から前記軸部に近づくにつれて前記開口部の面積を次第に小さくするように延在する環状の案内面と、前記案内面の下端の内側に位置する底面とで形成され、前記係合溝は前記凹部の底面に形成され、前記ねじ回転用工具の係合部の外周面がざぐりの内周面に接触した状態で、前記係合部の中心が前記頭部の上面の開口部の内側に位置するように構成されていることを特徴とする。
また、本発明は、雄ねじが形成された軸部と、前記軸部の端部に前記軸部よりも大きい断面の正六角形で形成された頭部とを有する六角ボルトと、前記六角ボルトの頭部を収容するざぐりが設けられると共に前記ざぐりの底面に前記六角ボルトの軸部を挿通させる挿通孔が前記ざぐりと同軸上に設けられた締結部とを備え、前記ざぐりに前記六角ボルトの頭部を収容して頭部の下面を前記ざぐりの底面に係止し、回転用工具の軸部の先端に形成された正六角形孔状の係合部を前記頭部に係合させて回転用工具により六角ボルトを回転させ、前記挿通孔に挿通させた前記軸部の雄ねじを、前記締結部を取り付けるべき相手方の雌ねじに螺合させることで前記締結部を取り付ける構造であって、前記頭部の上面に、前記頭部と同軸上に凸部が設けられ、前記凸部の外周面は、前記頭部の上面において前記凸部の断面が前記頭部の上面のほぼ全域にわたって広がると共に前記上面から離れるにつれて前記断面が次第に小さくなるように傾斜しつつ延在する環状の案内面で形成され、前記ねじ回転用工具の先端の外周面がざぐりの内周面に接触した状態で、前記凸部の中心が前記係合部の内側に位置するように構成されていることを特徴とする。
これらの本発明によれば、回転用工具の先端の係合部が案内面によりねじの係合溝や頭部に係合する方向に案内され、簡単に係合される。
【０００６】
【発明の実施の形態】
以下、本発明の実施の形態を図面に基づいて詳細に説明する。
まず、第１の実施の形態から説明する。
図１（Ａ）は第１の実施の形態に係るねじの断面正面図、（Ｂ）は同平面図を示す。
ねじ１２は、雄ねじが形成された軸部１４と、軸部１４の端部に軸部１４と同軸上で軸部１４の断面よりも大きい断面で設けられた頭部１６と、頭部１６に設けられた回転用の十字溝状の係合溝１８を有している。
頭部１６は、軸部１４側に位置する基部からその上面１６０２にわたり均一断面の円柱状に形成されている。
そして頭部１６に、この頭部１６と同軸上に凹部２０が設けられている。
【０００７】
凹部２０は、開口部２２と案内面２４と底面２６とで形成されている。
開口部２２は、頭部１６の上面１６０２においてこの上面１６０２のほぼ全域にわたる大きさで開口するように形成されている。したがって、頭部１６の上面１６０２は、開口部２２の周囲において細い幅で環状に延在する平坦面として残されている。本実施の形態では、開口部２２は円形に形成されている。
案内面２４は、開口部２２に連なり頭部１６の上面１６０２から軸部１４に近づくにつれて開口部２２の面積を次第に小さくするように傾斜しつつ環状に延在し、本実施の形態では、軸部１４に近づくにつれて内径が次第に小さくなる円錐面で形成されている。
底面２６は、案内面２４の下端の内側に位置し係合溝１８が収容される大きさで形成され、本実施の形態では円形の平坦面に形成され、係合溝１８はこの底面２６に形成されている。
底面２６の大きさ（底面２６の外径や案内面２４の下端の外径）は、ドライバー（回転用工具）の先端の十字状の係合部を係合溝１８に円滑に係合させる観点からすると、係合溝１８を構成する十字状溝の先端が底面２６の外周縁の近傍に位置する寸法が好ましい。より詳細には、底面２６の大きさは、係合溝１８の十字状溝の先端が底面２６の外周縁の近くに位置する寸法で形成され、あるいは、十字状溝の先端が底面２６の外周縁に接する寸法で形成され、あるいは、十字状溝の先端が案内面２４の下端に若干入り込む寸法で形成されていることが好ましい。
【０００８】
次に作用、効果について説明する。
従来ではドライバーの係合部の先端を小さい面積の係合溝１８に直接係合しなければならず、そのため係合部を係合溝１８に簡単に係合することができなかったが、本実施の形態のねじ１２によれば、ドライバーの係合部の先端が、係合溝１８よりも大きい面積の開口部２２の内側に接触しさえすれば、ドライバーの係合部は案内面２４により係合溝１８に係合する方向に導かれ、係合部が係合溝１８に簡単に係合される。
より詳細に説明すると、本実施の形態では、開口部２２が頭部１６の上面１６０２のほぼ全域にわたって形成されているので、ドライバーの係合部の先端がねじ１２の頭部１６の上面１６０２に接触しさえすれば、ドライバーの先端の係合部は案内面２４により案内されて係合溝１８に極めて簡単に係合される。
したがって、ねじ１２が大きい深さのざぐりの底部に配設され、ねじ１２の頭部１６が外部から視認できない場合であっても、ねじ１２の締結、取り外しを簡単に行なえ、特に、回収されたテレビなどの電気製品の分解作業を効率良く行なえ、リサイクルを低コストで行なう上で極めて有利となる。
【０００９】
なお、前記の実施の形態では、凹部２０の開口部２２を円形とし、案内面２４を円錐面で形成した場合について説明したが、開口部２２は多角形であってもよく、この場合には案内面２４は、多角形の開口部２２に連なる角錐面となり、底面は２６は多角形となる。
また、頭部１６は、凹部２０が形成される形状であればよく、したがって、円柱に限らず任意であり、角柱状に形成されていてもよく、あるいは、均一断面に形成されていなくてもよい。
また、前記実施の形態では、ねじ１２が小ねじである場合について説明したが、本発明においてねじの大きさは任意であり、また、タッピングねじなどにも適用される。
【００１０】
次に、ねじ１２を用いた取り付け構造について説明する。
図２はねじを用いた取り付け構造の断面図を示す。
締結部３０と被締結部３２とがねじ１２により結合されている。
ここで被締結部３２は、例えば、テレビのディスプレイの外周を保持するキャビネットのボス部であり、締結部３０は、ディスプレイの後部を収容する筐体の取り付け部である。
締結部３０には、ねじ配設用のざぐり３４が設けられ、ざぐり３４は、ねじ１２の頭部１６を収容する内径の内周面３４０２で、ねじ１２の頭部１６が外部から視認できないように大きな深さで形成されると共に、ざぐり３４の底面３４０４にねじ１２の軸部１４を挿通させる挿通孔３４０６がざぐり３４と同軸上に形成されている。ざぐり３４の内周面３４０２は、底面３４０４に近づくにつれ内径が次第に小さくなる円錐面で形成されている。
【００１１】
ねじ１２は、ざぐり３４に頭部１６が収容され、頭部１６の下面がざぐり３４の底面３４０４に係止され、雄ねじが被締結部３２の雌ねじ３２０２に締め付けられ、これにより締結部３０と被締結部３２とが締結されている。
ねじ１２を脱着するためにドライバー３６が用いられ、ドライバー３６は、軸部３６０２と、軸部３６０２の先端に設けられた十字状の係合部３６０４を備えている。
本実施の形態では、ドライバー３６の係合部３６０４の外周面が、ざぐり３４の底面３４０４近傍の内周面３４０２に接触した状態で、係合部３６０４の中心が頭部１６の開口部２２の内側に入るように、開口部２２の内径や底面３４０４近傍のざぐり３４の内径が形成されている。
【００１２】
このような取り付け構造によれば、被締結部３２と締結部３０とを締結し、あるいは、取り外す場合、ドライバー３６の軸部３６０２をざぐり３４に挿入し、係合部３６０４の外周面をざぐり３４の内周面３４０２に接触させつつ軸部３６０２をさらに底面３４０４側に入れると、係合部３６０４の先端が開口部２２の内側に位置しているので、係合部２２は案内面２４により係合溝１８方向に案内され、係合部３６０４は係合溝１８に簡単に係合される。
したがって、ねじ１２が筐体の奥深くに配置され、頭部１６が外部から視認できない場合にも、ドライバー３６の先端の係合部３６０４をねじ１２の係合溝１８に簡単に係合でき、ねじ１２の締結、取り外しを簡単に行なえ、特に、テレビなどの電気製品の分解作業を効率良く行なえるようになり、リサイクルを低コストで行なう上で極めて有利となる。
【００１３】
次に、第２の実施の形態について説明する。
図３（Ａ）は第２の実施の形態に係るねじの断面正面図、（Ｂ）は同平面図を示す。なお、以下の実施の形態において第１の実施の形態と同様な箇所には同一符号を付して説明する。
第２の実施の形態に係るねじ１２Ａは、係合溝１８の形状が第１の実施の形態と異なっている。
すなわち、ねじ１２Ａの係合溝１８は十字状溝ではなく正六角形孔状に形成されている。
そして、頭部１６に同軸上に設けられた凹部２０は、頭部１６の上面１６０２においてこの上面１６０２のほぼ全域にわたる大きさで開口する円形の開口部２２と、開口部２２に連なり軸部１４に近づくにつれて開口部２２の面積を次第に小さくするように延在する円錐面からなる案内面２４と、案内面２４の下端の内側に位置し係合溝１８が形成された平坦な底面２６とで構成され、頭部１６の上面１６０２は細い幅で環状に延在する平坦面として残されている。
【００１４】
底面２６の大きさ（底面２６の外径や案内面２４の下端の外径）は、六角レンチ（回転用工具）の正六角柱状の係合部を係合溝１８に円滑に係合させる観点からすると、係合溝１８を構成する正六角形孔の各角部が底面２６の外周縁の近傍に位置する寸法が好ましい。より詳細には、底面２６の大きさは、正六角形孔の各角部が底面２６の外周縁の近くに位置する寸法で形成され、あるいは、正六角形孔の各角部が底面２６の外周縁に接する寸法で形成され、あるいは、正六角形孔の各角部が案内面２４の下端に若干入り込む寸法で形成されていることが好ましく、正六角形孔の各角部を案内面２４の下端に入り込ませる程度によっては平坦な底面２６はなくなる。
このような第２の実施の形態によっても、第１の実施の形態と同様な効果が奏され、ねじ１２Ｂの締結、取り外しを簡単に行なえ、特に、電気製品などの分解作業を効率良く行なえ、リサイクルを低コストで行なう上で極めて有利となる。
【００１５】
次に、第３の実施の形態について説明する。
図４（Ａ）は第３の実施の形態に係るねじの断面正面図、（Ｂ）は同平面図を示す。
第３の実施の形態に係るねじ１２Ｂは、頭部１６の外周面（あるいは下面）が円錐面１６０４で形成された皿ねじである点が第１の実施の形態と異なっており、他の点は第１の実施の形態と同様である。
すなわち、ねじ１２Ｂの頭部１６に同軸上に設けられた凹部２０は、頭部１６の上面１６０２のほぼ全域にわたる大きさで開口する円形の開口部２２と、開口部２２に連なり軸部１４に近づくにつれて開口部２２の面積を次第に小さくする円錐面からなる案内面２４と、案内面２４の下端の内側に位置し十字溝状の係合溝１８が形成された円形の平坦な底面２６とで構成され、頭部１６の上面１６０２は細い幅で環状に延在する平坦面として残されている。
【００１６】
頭部１６の外周面をなす円錐面１６０４は、ねじ１２Ｂの軸部１４側に位置する基部が軸部１４と同一直径の外径で形成されると共に、この基部から上面１６０２にわたり直径が次第に大きくなるように形成され、凹部２０の案内面２４は、頭部１６の半径方向外方から見て円錐面１６０４の内側に入るように、円錐面１６０４の傾斜角度θ１よりも大きい傾斜角度θ２で形成されている。
このような第３の実施の形態によっても、第１の実施の形態と同様な効果が奏され、ねじ１２Ｂの締結、取り外しを簡単に行なえ、特に、電気製品などの分解作業を効率良く行なえ、リサイクルを低コストで行なう上で極めて有利となる。
【００１７】
なお、ねじ１２、１２Ａ、１２Ｂの頭部１６に形成される係合溝１８の形状は、第１乃至第３の実施の形態のような十字溝、正六角形孔に限らず、例えば、スリット状溝のようなその他の形状であってもよい。
さらに、ねじはＪＩＳ規格により、ねじの種類に応じてその軸部１４の外径で頭部１６の高さ、外径（断面積）が定められた規格品となっている。
本発明では、このような規格品のねじの頭部１６の上面に凹部２０を設けてもよく、この場合にはねじの種類によって、係合溝１８の深さが凹部２０の底面２６により削り取られて若干小さい寸法となる場合もありえる。
また、本発明では、凹部２０が形成されるように、規格品の頭部よりも大きい寸法の高さで頭部１６を形成し、あるいは、規格品の頭部よりも大きい寸法の外径（断面積）で頭部１６を形成し、あるいは、規格品の頭部よりも大きい寸法の高さおよび外径（断面積）で頭部１６を形成すると、案内面２４の面積がより大きく確保され、回転用工具の係合部を頭部１６の係合溝１８により円滑に案内する上で有利となる。
より詳細には、第１、第２の実施の形態において、頭部１６の外径を規格品と同一の寸法で形成すると共に、頭部１６の高さを規格品の頭部の高さよりも大きい寸法で形成し、この頭部１６に凹部２０を形成すると、係合溝１８の大きさを規格品と同一の寸法のままとして案内面２４の面積を大きく確保でき、回転用工具の係合部を頭部１６の係合溝１８により円滑に係合する上で有利となる。
あるいは、第１乃至第３の実施の形態において、頭部１６の高さを規格品の頭部の高さよりも大きい寸法で形成すると共に、頭部１６の外径を規格品の頭部の外径よりも大きい寸法で形成し、この頭部１６に凹部２０を形成すると、係合溝１８の大きさを規格品と同一の寸法のままとして案内面２４の面積をより大きく確保でき、回転用工具の係合部を頭部１６の係合溝１８により円滑に係合する上でより一層有利となる。
【００１８】
次に、第４の実施の形態について説明する。
図５（Ａ）は第４の実施の形態に係る六角ボルトの正面図、（Ｂ）は同平面図を示す。
第４の実施の形態では、ねじ１２が六角ボルト１２Ｃであり、凹部２０に代えて凸部５０が設けられている。
六角ボルト１２Ｃは、雄ねじが形成された軸部１４と、軸部１４の端部に軸部１４よりも大きい断面の正六角形で形成された頭部１６を有している。
凸部５０は頭部１６と同軸上に設けられている。
凸部５０の外周面は、頭部１６の上面１６０２において凸部５０の断面が頭部１６の上面のほぼ全域にわたって広がると共に上面１６０２から離れるにつれて前記断面が次第に小さくなるように傾斜しつつ延在する環状の案内面５４で形成されている。本実施の形態では、凸部５０は、頭部１６の上面１６０２において頭部１６を構成する正六角形の６つの辺の各中央に接する程度の大きさの円形断面で形成されると共に頭部１６の上面１６０２から離れるにつれて前記円形断面が次第に小さくなる円錐状に形成され、案内面５４は円錐面状に形成され、上面１６０２は、頭部１６をなす正六角形の各角部に湾曲面として残されている。
【００１９】
次に作用、効果について説明する。
従来ではソケットレンチ（回転用工具）の正六角形孔状の係合部の先端を頭部１６に直接係合しなければならず、そのため係合部を係合溝１８に簡単に係合することができなかったが、本実施の形態の六角ボルト１２Ｃによれば、係合部の内側に頭部１６よりも面積の小さい凸部５０の先端が入りさえすれば、係合部は案内面５４により頭部１６に係合する方向に導かれ係合部が頭部１６に係合される。
そして、凸部５０は、頭部１６の上面１６０２においてその断面が頭部１６の上面のほぼ全域にわたり広がっているので、ソケットレンチの係合部の凸部５０から頭部１６への係合も円滑になされる。
したがって、ソケットレンチの正六角形孔状の係合部を六角ボルト１２Ｃの頭部１６に簡単に係合させることができ、六角ボルト１２Ｃの締結、取り外しを簡単に行なえ、特に、回収されたテレビなどの電気製品の分解作業を効率良く行なえ、リサイクルを低コストで行なう上で極めて有利となる。
なお、前記の実施の形態では、凸部５０を円錐状に形成し、案内面５４を円錐面状に形成した場合について説明したが、凸部５０を多角錐状に形成し、案内面５４を角錐面としてもよい。例えば、凸部５０を、頭部１６の上面において頭部１６を構成する正六角形と同一形状の正六角形断面で形成すると共に頭部１６の上面１６０２から離れるにつれてこの正六角形断面が次第に小さくなる正六角錐状に形成し、案内面５４を正六角錐面状に形成してもよく、この場合には頭部１６の上面１６０２はなくなることになる。
また、頭部１６の高さを、軸部１４の外径で定まる規格品（ＪＩＳ規格）の寸法で形成してもよいが、頭部１６の高さを規格品の寸法よりも若干小さい寸法で形成しておくと、頭部１６の下面から凸部５０の先端までの寸法が短くなり、頭部１６の上面１６０２に凸部５０が存在しているにも拘わらずソケットレンチの正六角形孔状の係合部を頭部１６の下面まで十分に係合させる上で有利となる。また、本発明において六角ボルト１２Ｃは、四角ボルトなどのような他の多角形ボルトを含み、本発明のねじ（六角ボルトを含む）の材質は、金属、合成樹脂を問わず広く適用可能である。
【００２０】
次に、六角ボルト１２Ｃを用いた取り付け構造について説明する。
図６は六角ボルト１２Ｃを用いた取り付け構造の断面図を示す。
締結部３０と被締結部３２とが六角ボルト１２Ｃにより結合されている。
ここで被締結部３２は、例えば、テレビのディスプレイの外周を保持するキャビネットのボス部であり、締結部３０は、ディスプレイの後部を収容する筐体の取り付け部である。
締結部３０には、六角ボルト配設用のざぐり３４が設けられ、ざぐり３４は、内周面３４０２、底面３４０４、挿通孔３４０６を有している。内周面３４０２は、六角ボルト１２Ｃを回転させるソケットレンチ６６（回転用工具）の先端大径部６６０４を収容できる内径、および六角ボルト１２Ｃの頭部１６が外部から視認できないように大きな深さで形成されている。底面３４０４は内周面３４０２の下端の内側に円形に形成されている。軸挿通孔３４０６は、六角ボルト１２Ｃの軸部１４を挿通させる内径で、内周面３４０２と同軸上に底面３４０４に形成されている。内周面３４０２は、底面３４０４に近づくにつれ内径が次第に小さくなる円錐面で形成されている。
【００２１】
六角ボルト１２Ｃは、ざぐり３４に頭部１６が収容され、頭部１６の下面がざぐり３４の底面３４０４に係止され、雄ねじが被締結部３２の雌ねじ３２０２に締め付けられ、これにより締結部３０と被締結部３２とが締結されている。
ソケットレンチ６６は、軸部６６０２と、軸部６６０２の先端大径部６６０４に設けられた六角孔状の係合部６６０６を備えている。
本実施の形態では、ソケットレンチ６６の先端大径部３６０４の外周面が、ざぐり３４の底面３４０４近傍の内周面３４０２に接触した状態で、凸部５０の中心が係合部６６０６の内側に入るように内周面３４０２の内径が形成されている。
【００２２】
このような取り付け構造によれば、被締結部３２と締結部３０を締結し、あるいは、取り外す場合、ソケットレンチ６６の軸部６６０２をざぐり３４に挿入し、先端大径部６６０４の外周面をざぐり３４の内周面３４０２に接触させつつ軸部６６０２をさらに底面３４０４側に入れると、凸部５０の先端が係合部６６０６の内側に位置しているので、係合部６６０６は案内面５４により頭部１６方向に案内され、係合部６６０６は頭部１６に簡単に係合される。
したがって、六角ボルト１２Ｃが筐体の奥深くに配置され、頭部１６が外部から視認できない場合にも、ソケットレンチ６６の先端の係合部６６０６を六角ボルト１２Ｃの頭部１６に簡単に係合でき、六角ボルト１２Ｃの締結、取り外しを簡単に行なえ、特に、テレビなどの電気製品の分解作業を効率良く行なえるようになり、リサイクルを低コストで行なう上で極めて有利となる。
【００２３】
【発明の効果】
以上説明したように本発明のねじ、六角ボルト、それらを用いた取り付け構造によれば、簡易な構成により締結や取り外しを簡単に行なえ、特に、テレビなどの電気製品の分解作業を効率良く行なえるようになり、リサイクルを低コストで行なう上で極めて有利となる。
【図面の簡単な説明】
【図１】（Ａ）は第１の実施の形態に係るねじの断面正面図、（Ｂ）は同平面図である。
【図２】ねじを用いた取り付け構造の断面図である。
【図３】（Ａ）は第２の実施の形態に係るねじの断面正面図、（Ｂ）は同平面図である。
【図４】（Ａ）は第３の実施の形態に係るねじの断面正面図、（Ｂ）は同平面図である。
【図５】（Ａ）は第４の実施の形態に係る六角ボルトの正面図、（Ｂ）は同平面図である。
【図６】六角ボルトを用いた取り付け構造の断面図である。
【符号の説明】
１２、１２Ａ、１２Ｂ……ねじ、１２Ｃ……六角ボルト、１４……軸部、１６……頭部、１８……係合溝、２０……凹部、２２……開口部、２４……案内面、３０……締結部、３２……被締結部、３４……ざぐり、５０……凸部、５４……案内面。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a screw and a mounting structure using the screw.
[0002]
[Prior art]
In recent years, resource recycling campaigns have been widely conducted from the viewpoint of global environmental protection.
In various industries including the light electric industry, the recycling of materials has been reviewed, and one of the important design factors is how to easily disassemble products for recycling.
On the other hand, in the case of electric products such as televisions, the housing is often assembled with small screws arranged deep inside the housing for design reasons.
In such a case, the small screw is disposed at the bottom of the deep counterbore, and its head cannot be visually recognized from the outside. Therefore, the engaging portion at the tip of a screwdriver or the like is engaged with the engaging groove of the screw head. There was a problem that it was difficult to disassemble the collected electric products such as televisions efficiently.
Therefore, it has been proposed that the counterbore is formed as a conical surface whose inner diameter gradually decreases as it reaches the bottom, and that the conical surface guides the engaging portion at the tip of a driver or the like. Is difficult to engage with the engagement groove of the head of the screw (for example, see Patent Document 1).
[0003]
[Patent Document 1]
JP 2000-212321 A
[Problems to be solved by the invention]
This is because, in many cases, the head of the small screw is formed in a hemispherical shape, so that when the screw is disengaged from the engaging groove, the engaging portion of the driver is guided by the head of the small screw in the direction of disengaging the engaging groove. This is because it is difficult for the engagement portion of the driver to enter the engagement groove of the head of the machine screw.
Further, even when the hexagon bolt is disposed deep in the housing and the head cannot be visually recognized from the outside, there is a problem that it is difficult to engage the regular hexagonal hole-shaped engaging portion at the tip of the socket wrench with the head.
The present invention has been devised in view of the above circumstances, and an object of the present invention is to provide the engaging portion at the tip of the rotating tool with the head of the screw even when the head of the screw is not visible. An object of the present invention is to provide a screw and a mounting structure using the screw, which can be easily engaged with the engaging groove, and the engaging portion at the tip of the rotating tool can be easily engaged with the head of the hexagon bolt. .
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a shaft formed with a male screw, and a head provided at an end of the shaft with a cross section larger than a cross section of the shaft on the same axis as the shaft. A screw having an engagement groove for rotation provided in the head, wherein the head has a recess coaxially with the head, and the recess covers substantially the entire upper surface of the head. An opening that extends over the opening, an annular guide surface that is continuous with the opening, and extends while being inclined so as to gradually reduce the area of the opening as approaching the shaft from the opening; and a lower end of the guide surface. And a bottom surface located inside the recess, and the engagement groove is formed on a bottom surface of the concave portion.
Further, the present invention is a hexagonal bolt having a shaft formed with a male screw and a head formed in a regular hexagonal cross section larger than the shaft at an end of the shaft, wherein the head is On the upper surface of the head, a convex portion is provided coaxially with the head, and the outer peripheral surface of the convex portion has a cross section of the convex portion on the upper surface of the head extending over substantially the entire upper surface of the head and the upper surface The cross-section is formed by an annular guide surface that extends while being inclined so as to gradually decrease as the distance from the guide surface increases.
Further, the present invention provides a shaft portion having an external thread formed thereon, a head provided at an end of the shaft portion with a cross section larger than a cross section of the shaft portion coaxially with the shaft portion, and A screw having a provided engagement groove for rotation, a counterbore for accommodating a head of the screw is provided, and an insertion hole for inserting a shaft portion of the screw into a bottom surface of the counterbore is coaxial with the counterbore. A fastening portion provided, wherein the head is accommodated in the counterbore, the lower surface of the head is locked to the bottom surface of the counterbore, and the engagement portion at the tip of the shaft of the rotating tool is engaged with the engagement groove. The screw is rotated by a rotating tool by engaging with the male screw of the shaft portion inserted through the insertion hole, and the fastening portion is attached by screwing the male screw of the shaft portion to the female screw of the other party to which the fastening portion is to be attached. A recess provided on the head coaxially with the head; An opening that opens over substantially the entire area of the upper surface of the head, and an annular shape that is continuous with the opening and extends from the upper surface of the head to gradually decrease the area of the opening as approaching the shaft. A guide surface, and a bottom surface located inside a lower end of the guide surface, wherein the engagement groove is formed in a bottom surface of the concave portion, and an outer peripheral surface of an engagement portion of the screw rotating tool has a counterbore inner periphery. It is characterized in that the center of the engaging portion is located inside the opening on the upper surface of the head when in contact with the surface.
The present invention also provides a hexagonal bolt having a shaft formed with a male screw, a head formed in a regular hexagonal cross section larger than the shaft at an end of the shaft, and a head of the hexagonal bolt. A counterbore for accommodating the counterbore is provided, and a through hole through which a shaft portion of the hexagonal bolt is inserted into a bottom surface of the counterbore includes a fastening portion provided coaxially with the counterbore; And the lower surface of the head is locked to the bottom surface of the counterbore, and a regular hexagonal hole-shaped engaging portion formed at the tip of the shaft of the rotating tool is engaged with the head to rotate the tool. A structure for attaching the fastening portion by screwing a male screw of the shaft portion inserted into the insertion hole with a female screw of a counterpart to which the fastening portion is to be attached, by rotating a hexagon bolt by On the top surface, a protrusion is provided coaxially with the head The outer peripheral surface of the convex portion extends on the upper surface of the head while being inclined such that the cross section of the convex portion extends over substantially the entire area of the upper surface of the head and the cross section gradually decreases as the distance from the upper surface increases. The center of the convex portion is located inside the engaging portion while the outer peripheral surface of the tip of the screw rotating tool is in contact with the inner peripheral surface of the counterbore. It is characterized by having been done.
According to the present invention, the engaging portion at the tip of the rotating tool is guided by the guide surface in the direction of engaging with the engaging groove or the head of the screw, and is easily engaged.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
First, the first embodiment will be described.
FIG. 1A is a sectional front view of a screw according to the first embodiment, and FIG. 1B is a plan view of the same.
The screw 12 has a shaft portion 14 on which a male screw is formed, a head 16 provided at an end of the shaft portion 14 with a cross section larger than a cross section of the shaft portion 14 coaxially with the shaft portion 14, and a head 16. It has a provided cross-shaped engagement groove 18 for rotation.
The head 16 is formed in a columnar shape with a uniform cross section from the base located on the shaft portion 14 side to the upper surface 1602 thereof.
A recess 20 is provided on the head 16 coaxially with the head 16.
[0007]
The recess 20 is formed by an opening 22, a guide surface 24 and a bottom surface 26.
The opening 22 is formed on the upper surface 1602 of the head 16 so as to have a size that covers almost the entire area of the upper surface 1602. Therefore, the upper surface 1602 of the head 16 is left as a flat surface that extends annularly with a small width around the opening 22. In the present embodiment, the opening 22 is formed in a circular shape.
The guide surface 24 is connected to the opening 22 and extends annularly while being inclined so as to gradually reduce the area of the opening 22 as approaching the shaft 14 from the upper surface 1602 of the head 16. It is formed of a conical surface whose inner diameter gradually decreases as approaching the portion 14.
The bottom surface 26 is formed inside the lower end of the guide surface 24 and is sized to accommodate the engagement groove 18. In the present embodiment, the bottom surface 26 is formed as a circular flat surface. Is formed.
The size of the bottom surface 26 (the outer diameter of the bottom surface 26 and the outer diameter of the lower end of the guide surface 24) is such that a cross-shaped engaging portion at the tip of a driver (rotating tool) is smoothly engaged with the engaging groove 18. In view of this, it is preferable that the cross-shaped groove constituting the engagement groove 18 has a tip located near the outer peripheral edge of the bottom surface 26. More specifically, the size of the bottom surface 26 is such that the tip of the cross-shaped groove of the engagement groove 18 is formed near the outer peripheral edge of the bottom surface 26, or the tip of the cross-shaped groove is formed outside the bottom surface 26. It is preferable that the groove is formed so as to be in contact with the peripheral edge, or is formed such that the tip of the cross-shaped groove slightly enters the lower end of the guide surface 24.
[0008]
Next, the operation and effect will be described.
Conventionally, the tip of the engaging portion of the driver had to be directly engaged with the engaging groove 18 having a small area. Therefore, the engaging portion could not be easily engaged with the engaging groove 18. According to the screw 12 of the embodiment, as long as the tip of the engagement portion of the driver contacts the inside of the opening 22 having an area larger than the engagement groove 18, the engagement portion of the driver is formed by the guide surface 24. The guide is guided in the direction of engagement with the engagement groove 18, and the engagement portion is easily engaged with the engagement groove 18.
More specifically, in the present embodiment, since the opening 22 is formed over substantially the entire area of the upper surface 1602 of the head 16, the tip of the engaging portion of the driver is formed on the upper surface 1602 of the head 16 of the screw 12. As long as it makes contact, the engaging portion at the tip of the driver is guided by the guide surface 24 and is very easily engaged with the engaging groove 18.
Therefore, even when the screw 12 is disposed at the bottom of the counterbore having a large depth and the head 16 of the screw 12 is not visible from the outside, the screw 12 can be easily fastened and removed, and in particular, the screw 12 is recovered. This is extremely advantageous in that the disassembling operation of electric products such as televisions can be performed efficiently and recycling can be performed at low cost.
[0009]
In the above embodiment, the case where the opening 22 of the recess 20 is circular and the guide surface 24 is formed as a conical surface has been described. However, the opening 22 may be polygonal. The guide surface 24 is a pyramid surface connected to the polygonal opening 22, and the bottom surface 26 is a polygon.
In addition, the head 16 may have any shape as long as the concave portion 20 is formed, and therefore, is not limited to a cylinder, and may be any shape, may be formed in a prismatic shape, or may not be formed in a uniform cross section. Good.
In the above-described embodiment, the case where the screw 12 is a small screw has been described. However, in the present invention, the size of the screw is arbitrary, and the present invention is also applied to a tapping screw or the like.
[0010]
Next, a mounting structure using the screw 12 will be described.
FIG. 2 shows a sectional view of a mounting structure using screws.
The fastening part 30 and the fastened part 32 are connected by the screw 12.
Here, the fastened portion 32 is, for example, a boss portion of a cabinet that holds the outer periphery of the television display, and the fastened portion 30 is a mounting portion of a housing that accommodates a rear portion of the display.
The fastening portion 30 is provided with a counterbore 34 for arranging the screw. The counterbore 34 is an inner peripheral surface 3402 having an inner diameter that accommodates the head 16 of the screw 12 so that the head 16 of the screw 12 cannot be visually recognized from the outside. In addition, an insertion hole 3406 for inserting the shaft portion 14 of the screw 12 into the bottom surface 3404 of the counterbore 34 is formed coaxially with the counterbore 34. The inner peripheral surface 3402 of the counterbore 34 is formed as a conical surface whose inner diameter gradually decreases as approaching the bottom surface 3404.
[0011]
The head portion 16 of the screw 12 is accommodated in the counterbore 34, the lower surface of the head portion 16 is locked to the bottom surface 3404 of the counterbore 34, and the male screw is tightened to the female screw 3202 of the portion 32 to be fastened. The fastening portion 32 is fastened.
A driver 36 is used to attach and detach the screw 12. The driver 36 includes a shaft 3602 and a cross-shaped engaging portion 3604 provided at the tip of the shaft 3602.
In the present embodiment, with the outer peripheral surface of the engaging portion 3604 of the driver 36 in contact with the inner peripheral surface 3402 near the bottom surface 3404 of the counterbore 34, the center of the engaging portion 3604 is The inside diameter of the opening 22 and the inside diameter of the counterbore 34 near the bottom surface 3404 are formed so as to enter the inside.
[0012]
According to such an attachment structure, when fastening or removing the fastened portion 32 and the fastening portion 30, the shaft 3602 of the driver 36 is inserted into the counterbore 34, and the outer peripheral surface of the engaging portion 3604 is counterbore 34. When the shaft portion 3602 is further inserted into the bottom surface 3404 side while being in contact with the inner peripheral surface 3402, the tip of the engaging portion 3604 is located inside the opening 22, so that the engaging portion 22 is engaged with the guide surface 24. Guided in the direction of the mating groove 18, the engaging portion 3604 is easily engaged with the engaging groove 18.
Therefore, even when the screw 12 is disposed deep in the housing and the head 16 cannot be visually recognized from the outside, the engaging portion 3604 at the tip of the driver 36 can be easily engaged with the engaging groove 18 of the screw 12. 12 can be easily attached and detached, and in particular, the disassembly work of an electric product such as a television can be efficiently performed, which is extremely advantageous in performing recycling at low cost.
[0013]
Next, a second embodiment will be described.
FIG. 3A is a sectional front view of a screw according to the second embodiment, and FIG. 3B is a plan view of the same. In the following embodiments, the same parts as those in the first embodiment will be described with the same reference numerals.
The screw 12A according to the second embodiment differs from the first embodiment in the shape of the engagement groove 18.
That is, the engaging groove 18 of the screw 12A is formed in a regular hexagonal hole shape instead of a cross-shaped groove.
The concave portion 20 provided coaxially with the head 16 has a circular opening 22 which is open on the upper surface 1602 of the head 16 so as to extend over substantially the entire area of the upper surface 1602, and a shaft 14 which is connected to the opening 22. , A guide surface 24 formed of a conical surface extending so as to gradually reduce the area of the opening portion 22 as it approaches the flat surface 26 having an engagement groove 18 formed inside the lower end of the guide surface 24. The upper surface 1602 of the head 16 is left as a flat surface having a small width and extending annularly.
[0014]
The size of the bottom surface 26 (the outer diameter of the bottom surface 26 and the outer diameter of the lower end of the guide surface 24) is such that a regular hexagonal columnar engaging portion of a hexagon wrench (rotating tool) is smoothly engaged with the engaging groove 18. In view of this, it is preferable that each corner of the regular hexagonal hole forming the engaging groove 18 is located near the outer peripheral edge of the bottom surface 26. More specifically, the size of the bottom surface 26 is such that each corner of the regular hexagonal hole is formed near the outer peripheral edge of the bottom surface 26, or each corner of the regular hexagonal hole is formed at the outer peripheral edge of the bottom surface 26. It is preferable that each corner of the regular hexagonal hole is formed so as to slightly enter the lower end of the guide surface 24, and each corner of the regular hexagonal hole is inserted into the lower end of the guide surface 24. Depending on the extent to which it is applied, the flat bottom surface 26 is eliminated.
According to the second embodiment, the same effects as those of the first embodiment can be obtained, and the fastening and removal of the screw 12B can be easily performed. In particular, the disassembling operation of an electric product or the like can be efficiently performed. This is extremely advantageous in performing recycling at low cost.
[0015]
Next, a third embodiment will be described.
FIG. 4A is a sectional front view of a screw according to the third embodiment, and FIG. 4B is a plan view of the same.
The screw 12B according to the third embodiment is different from the first embodiment in that the outer peripheral surface (or lower surface) of the head 16 is a countersunk screw formed by a conical surface 1604, and other points are the same. Are the same as in the first embodiment.
That is, the concave portion 20 provided coaxially with the head 16 of the screw 12B has a circular opening 22 that opens with a size that covers almost the entire area of the upper surface 1602 of the head 16, and the shaft portion 14 that is connected to the opening 22. A guide surface 24 formed of a conical surface that gradually reduces the area of the opening portion 22 as it approaches, and a circular flat bottom surface 26 that is located inside the lower end of the guide surface 24 and has a cross-shaped engagement groove 18 formed therein. The upper surface 1602 of the head 16 is left as a flat surface having a small width and extending annularly.
[0016]
The conical surface 1604 which forms the outer peripheral surface of the head 16 has a base located on the shaft portion 14 side of the screw 12B having the same outer diameter as the shaft portion 14 and has a diameter gradually increasing from this base to the upper surface 1602. The guide surface 24 of the concave portion 20 is formed at an inclination angle θ2 larger than the inclination angle θ1 of the conical surface 1604 so as to enter the inside of the conical surface 1604 when viewed from the outside of the head 16 in the radial direction. Have been.
According to the third embodiment, the same effects as those of the first embodiment can be obtained, and the fastening and removal of the screw 12B can be easily performed. In particular, the disassembling operation of an electric product or the like can be efficiently performed. This is extremely advantageous in performing recycling at low cost.
[0017]
The shape of the engaging groove 18 formed in the head 16 of the screw 12, 12A, 12B is not limited to a cross groove or a regular hexagonal hole as in the first to third embodiments, but may be, for example, a slit shape. Other shapes such as grooves may be used.
Further, the screw is a standard product in which the height and the outer diameter (cross-sectional area) of the head 16 are determined by the outer diameter of the shaft portion 14 according to the type of the screw according to the JIS standard.
In the present invention, the recess 20 may be provided on the upper surface of the head 16 of such a standard screw. In this case, the depth of the engagement groove 18 is cut off by the bottom 26 of the recess 20 depending on the type of the screw. It may be slightly smaller in size.
Further, in the present invention, the head 16 is formed at a height larger than the head of the standard product so that the recess 20 is formed, or the outer diameter ( When the head 16 is formed with a cross-sectional area), or when the head 16 is formed with a height and an outer diameter (cross-sectional area) larger than the head of a standard product, a larger area of the guide surface 24 is secured. This is advantageous in that the engaging portion of the rotating tool is smoothly guided by the engaging groove 18 of the head 16.
More specifically, in the first and second embodiments, the outer diameter of the head 16 is formed to have the same size as the standard product, and the height of the head 16 is set to be larger than the height of the standard product head. If the recess 16 is formed in the head 16 with a large size, the area of the guide surface 24 can be secured large while the size of the engagement groove 18 remains the same as that of the standard product. This is advantageous in that the portions are smoothly engaged by the engagement grooves 18 of the head 16.
Alternatively, in the first to third embodiments, the height of the head 16 is formed to be larger than the height of the head of the standard product, and the outer diameter of the head 16 is set to the outside diameter of the head of the standard product. If the recess 16 is formed in the head 16 with a size larger than the diameter, the area of the guide surface 24 can be secured larger while keeping the size of the engagement groove 18 the same as that of the standard product. This is even more advantageous in smoothly engaging the engagement portion of the tool with the engagement groove 18 of the head 16.
[0018]
Next, a fourth embodiment will be described.
FIG. 5A is a front view of a hexagon bolt according to the fourth embodiment, and FIG. 5B is a plan view of the same.
In the fourth embodiment, the screw 12 is a hexagonal bolt 12 </ b> C, and a projection 50 is provided instead of the recess 20.
The hexagonal bolt 12C has a shaft portion 14 on which a male screw is formed, and a head 16 formed at the end of the shaft portion 14 and having a regular hexagonal cross section larger than the shaft portion 14.
The protrusion 50 is provided coaxially with the head 16.
The outer peripheral surface of the convex portion 50 extends while being inclined such that the cross section of the convex portion 50 spreads over substantially the entire upper surface of the head portion 16 and gradually decreases as the distance from the upper surface 1602 increases. An annular guide surface 54 is formed. In the present embodiment, the convex portion 50 is formed in a circular cross section of such a size as to be in contact with the center of each of the six sides of the regular hexagon constituting the head 16 on the upper surface 1602 of the head 16 and the head 16 The guide surface 54 is formed in a conical shape, and the upper surface 1602 is formed as a curved surface at each corner of the regular hexagon forming the head 16. Have been.
[0019]
Next, the operation and effect will be described.
Conventionally, the front end of a regular hexagonal hole-shaped engaging portion of a socket wrench (rotating tool) must be directly engaged with the head 16, so that the engaging portion is easily engaged with the engaging groove 18. However, according to the hexagon bolt 12C of the present embodiment, as long as the tip of the convex portion 50 having a smaller area than the head 16 enters the inside of the engaging portion, the engaging portion is not guided by the guide surface 54. Thus, the engagement portion is guided to the direction of engagement with the head 16 and the engagement portion is engaged with the head 16.
Since the cross section of the convex portion 50 on the upper surface 1602 of the head 16 extends over substantially the entire area of the upper surface of the head 16, the engagement of the engaging portion of the socket wrench from the convex portion 50 to the head 16 is also reduced. It is done smoothly.
Therefore, the regular hexagonal hole-shaped engaging portion of the socket wrench can be easily engaged with the head 16 of the hexagonal bolt 12C, and the hexagonal bolt 12C can be easily fastened and removed. This is extremely advantageous in that the disassembly operation of the electric product can be performed efficiently and recycling can be performed at low cost.
In the above-described embodiment, the case where the convex portion 50 is formed in a conical shape and the guide surface 54 is formed in a conical surface shape has been described. However, the convex portion 50 is formed in a polygonal pyramid shape, and the guide surface 54 is formed. It may be a pyramid surface. For example, the convex portion 50 is formed on the upper surface of the head 16 with a regular hexagonal cross section having the same shape as the regular hexagon forming the head 16, and the regular hexagonal cross section gradually becomes smaller as the distance from the upper surface 1602 of the head 16 increases. The guide surface 54 may be formed in the shape of a regular hexagonal pyramid, and in this case, the upper surface 1602 of the head 16 is eliminated.
In addition, the height of the head 16 may be formed to the size of a standard product (JIS standard) determined by the outer diameter of the shaft portion 14, but the height of the head 16 is slightly smaller than the size of the standard product. In this case, the dimension from the lower surface of the head 16 to the tip of the convex portion 50 becomes shorter, and the regular hexagonal hole of the socket wrench despite the presence of the convex portion 50 on the upper surface 1602 of the head 16. This is advantageous in that the engagement portion having the shape of a circle is sufficiently engaged with the lower surface of the head 16. In the present invention, the hexagonal bolt 12C includes other polygonal bolts such as a square bolt, and the material of the screw (including the hexagonal bolt) of the present invention can be widely applied regardless of metal or synthetic resin. .
[0020]
Next, a mounting structure using the hexagon bolt 12C will be described.
FIG. 6 is a sectional view of a mounting structure using a hexagon bolt 12C.
The fastening portion 30 and the fastened portion 32 are connected by a hexagon bolt 12C.
Here, the fastened portion 32 is, for example, a boss portion of a cabinet that holds the outer periphery of the television display, and the fastened portion 30 is a mounting portion of a housing that accommodates a rear portion of the display.
A counterbore 34 for arranging hexagon bolts is provided in the fastening portion 30, and the counterbore 34 has an inner peripheral surface 3402, a bottom surface 3404, and an insertion hole 3406. The inner peripheral surface 3402 has an inner diameter capable of accommodating the large-diameter portion 6604 of the tip of the socket wrench 66 (rotating tool) for rotating the hexagon bolt 12C, and has a large depth so that the head 16 of the hexagon bolt 12C cannot be visually recognized from the outside. Is formed. The bottom surface 3404 is formed in a circular shape inside the lower end of the inner peripheral surface 3402. The shaft insertion hole 3406 has an inner diameter through which the shaft portion 14 of the hexagon bolt 12C is inserted, and is formed on the bottom surface 3404 coaxially with the inner peripheral surface 3402. The inner peripheral surface 3402 is formed as a conical surface whose inner diameter gradually decreases as approaching the bottom surface 3404.
[0021]
The head 16 is housed in the counterbore 34, the lower surface of the head 16 is locked to the bottom surface 3404 of the counterbore 34, and the male screw is fastened to the female screw 3202 of the part 32 to be fastened, whereby the fastening part 30 The fastened portion 32 is fastened.
The socket wrench 66 includes a shaft portion 6602 and a hexagonal hole-shaped engaging portion 6606 provided on a large-diameter portion 6604 of the shaft portion 6602.
In the present embodiment, with the outer peripheral surface of the large-diameter portion 3604 at the distal end of the socket wrench 66 in contact with the inner peripheral surface 3402 near the bottom surface 3404 of the counterbore 34, the center of the convex portion 50 is positioned inside the engaging portion 6606. The inner diameter of the inner peripheral surface 3402 is formed so as to fit therein.
[0022]
According to such an attachment structure, when fastening or removing the fastened portion 32 and the fastening portion 30, the shaft portion 6602 of the socket wrench 66 is inserted into the counterbore 34, and the outer peripheral surface of the large-diameter portion 6604 is counterbored. When the shaft portion 6602 is further inserted into the bottom surface 3404 side while making contact with the inner peripheral surface 3402 of the projection 34, the tip of the projection 50 is located inside the engagement portion 6606, and the engagement portion 6606 is moved by the guide surface 54. Guided in the direction of the head 16, the engaging portion 6606 is easily engaged with the head 16.
Therefore, even when the hexagon bolt 12C is arranged deep in the housing and the head 16 cannot be visually recognized from the outside, the engaging portion 6606 at the tip of the socket wrench 66 can be easily engaged with the head 16 of the hexagon bolt 12C. The hexagonal bolt 12C can be easily fastened and removed, and particularly, the disassembly work of an electric product such as a television can be efficiently performed, which is extremely advantageous in performing recycling at low cost.
[0023]
【The invention's effect】
As described above, according to the screws and hexagon bolts of the present invention and the mounting structure using them, fastening and removal can be easily performed with a simple configuration, and in particular, the disassembly work of an electric product such as a television can be efficiently performed. This is extremely advantageous in performing recycling at low cost.
[Brief description of the drawings]
FIG. 1A is a sectional front view of a screw according to a first embodiment, and FIG. 1B is a plan view of the same.
FIG. 2 is a cross-sectional view of a mounting structure using screws.
FIG. 3A is a sectional front view of a screw according to a second embodiment, and FIG. 3B is a plan view of the same.
FIG. 4A is a sectional front view of a screw according to a third embodiment, and FIG. 4B is a plan view of the same.
FIG. 5A is a front view of a hexagonal bolt according to a fourth embodiment, and FIG. 5B is a plan view of the same.
FIG. 6 is a sectional view of a mounting structure using a hexagon bolt.
[Explanation of symbols]
12, 12A, 12B ... screw, 12C ... hexagon bolt, 14 ... shaft, 16 ... head, 18 ... engagement groove, 20 ... recess, 22 ... opening, 24 ... guide surface , 30 ... fastening part, 32 ... fastening part, 34 ... counterbore, 50 ... convex part, 54 ... guide surface.

Claims

A shaft portion having an external thread formed thereon, a head provided at an end of the shaft portion coaxially with the shaft portion and having a cross section larger than a cross section of the shaft portion, and a rotating portion provided on the head portion. A screw having an engagement groove,
A recess is provided on the head coaxially with the head,
The recess has an opening that opens over substantially the entire area of the top surface of the head, and extends while being inclined so as to be continuous with the opening and gradually reduce the area of the opening as approaching the shaft from the opening. Annular guide surface, and a bottom surface located inside the lower end of the guide surface,
The engagement groove is formed on a bottom surface of the concave portion,
A screw characterized in that:

The screw according to claim 1, wherein the guide surface is formed as a conical surface whose inner diameter gradually decreases as approaching the shaft portion, and the bottom surface is formed in a circular shape.

The screw according to claim 1, wherein the head has a uniform cross section from the base located on the shaft side to the upper surface.

The screw according to claim 1, wherein the head is formed in a columnar shape having a uniform cross section from the base located on the shaft portion side to the upper surface.

The screw according to claim 1, wherein the bottom surface is formed in such a size that an outer edge of the engagement groove is located near an outer periphery of the bottom surface.

The outer peripheral surface of the head, the base located on the shaft portion side is formed with an outer diameter of the same diameter as the shaft portion, and is formed as a conical surface whose diameter gradually increases from the base to the upper surface, 2. The guide surface according to claim 1, wherein the guide surface is formed at an inclination angle larger than an inclination angle of the conical surface so as to be inside the conical surface when viewed from the radial outside of the head. 3. screw.

The screw according to claim 1, wherein the engaging groove is a cross-shaped groove, a slit-shaped groove, or a hexagonal hole.

The height of the head of the screw is formed to be larger than the height of the head of a standard screw determined by the outer diameter of the shaft so that the recess is formed. The screw according to claim 1.

The outer diameter of the head of the screw is formed to be larger than the outer diameter of the head of a standard screw determined by the outer diameter of the shaft so that the recess is formed. 2. The screw according to claim 1, wherein said screw is formed.

The height and outer diameter of the head of the screw are formed to be larger than the height and outer diameter of the head of a standard screw determined by the outer diameter of the shaft so that the recess is formed. The screw according to claim 1, wherein the screw is provided.

A hexagonal bolt having a shaft formed with a male screw, and a head formed in a regular hexagonal cross section larger than the shaft at an end of the shaft,
On the upper surface of the head, a convex portion is provided coaxially with the head,
The outer peripheral surface of the convex portion extends on the upper surface of the head while being inclined such that the cross section of the convex portion extends over substantially the entire area of the upper surface of the head and the cross section gradually decreases as the distance from the upper surface increases. Formed by an annular guide surface,
Hex bolts characterized by the following.

The convex portion is formed in a circular cross section having a size such that the convex portion contacts the center of each of six sides of a regular hexagon constituting the head on the upper surface of the head, and the circular shape increases with distance from the upper surface of the head. The hexagonal bolt according to claim 11, wherein the guide surface is formed in a conical shape with a gradually decreasing cross section.

The convex portion is formed on the upper surface of the head with a regular hexagonal cross section having the same shape as the regular hexagon constituting the head, and the regular hexagonal pyramid shape in which the regular hexagonal cross section gradually becomes smaller as the distance from the upper surface of the head increases. The hexagonal bolt according to claim 11, wherein the guide surface is formed in a regular hexagonal pyramid shape.

The hexagonal bolt according to claim 11, wherein the height of the hexagonal bolt head is smaller than the height of a standard hexagonal bolt head determined by the outer diameter of the shaft portion. .

A shaft portion having an external thread formed thereon, a head provided at an end of the shaft portion coaxially with the shaft portion and having a cross section larger than a cross section of the shaft portion, and a rotating portion provided on the head portion. A screw having an engagement groove;
A counterbore for accommodating the head of the screw is provided, and an insertion hole for inserting a shaft portion of the screw into a bottom surface of the counterbore is provided with a fastening portion provided coaxially with the counterbore,
The head of the screw is accommodated in the counterbore, the lower surface of the head is locked to the bottom of the counterbore, and the engaging portion at the tip of the shaft of the rotating tool is engaged with the engaging groove to rotate. A structure in which the screw is rotated by a tool, and the male screw of the shaft portion inserted into the insertion hole is screwed to a female screw of a mating member to which the fastener is to be attached, thereby attaching the fastening portion.
A recess is provided on the head coaxially with the head,
The concave portion has an opening that opens over substantially the entire area of the upper surface of the head, and extends so as to be continuous with the opening and to gradually reduce the area of the opening as approaching the shaft from the upper surface of the head. An annular guide surface and a bottom surface located inside the lower end of the guide surface,
The engagement groove is formed on a bottom surface of the concave portion,
With the outer peripheral surface of the engaging portion of the screw rotating tool in contact with the inner peripheral surface of the counterbore, the center of the engaging portion is located inside the opening on the upper surface of the head. ,
A mounting structure using a screw, characterized in that:

A hexagonal bolt having a shank on which a male screw is formed, and a head formed in a regular hexagonal cross section larger than the shank at the end of the shank;
A counterbore for accommodating the head of the hexagon bolt is provided, and an insertion hole for inserting a shaft portion of the hexagon bolt into the bottom of the counterbore is provided with a fastening portion provided coaxially with the counterbore,
The head of the hexagon bolt is housed in the counterbore, the lower surface of the head is locked to the bottom of the counterbore, and a regular hexagonal hole-shaped engaging portion formed at the tip of the shaft of the rotating tool is connected to the head. Attach the fastening portion by screwing the male screw of the shaft portion inserted into the insertion hole to the mating female screw to which the fastening portion is to be attached by rotating the hexagon bolt with the rotating tool by engaging with the portion. Structure,
On the upper surface of the head, a convex portion is provided coaxially with the head,
The outer peripheral surface of the convex portion extends on the upper surface of the head while being inclined such that the cross section of the convex portion extends over substantially the entire area of the upper surface of the head and the cross section gradually decreases as the distance from the upper surface increases. Formed by an annular guide surface,
In a state where the outer peripheral surface of the tip of the screw rotating tool is in contact with the inner peripheral surface of the counterbore, the center of the convex portion is configured to be located inside the engaging portion,
A mounting structure using a screw, characterized in that: