JP4362990B2

JP4362990B2 - Tool holding device for impact tools

Info

Publication number: JP4362990B2
Application number: JP2001141532A
Authority: JP
Inventors: 博芳賀; 敦行菊池
Original assignee: Hitachi Koki Co Ltd
Current assignee: Koki Holdings Co Ltd
Priority date: 2001-05-11
Filing date: 2001-05-11
Publication date: 2009-11-11
Anticipated expiration: 2021-05-11
Also published as: JP2002337070A

Description

【０００１】
【発明の属する技術分野】
本発明は、電気ハンマ、ハンマドリル等の衝撃工具の工具保持装置に関するものである。
【０００２】
【従来の技術】
衝撃工具の工具保持装置は、基本的に図１４、図１５に示すようにスリーブ２内に先端工具１を収納した状態で、スリーブ２にスリーブ２の半径方向に移動可能に保持された錠止部材３をスリーブ２の半径方向内側に移動させ半径方向外側の移動を規制し、先端工具１の他部より外径の小さい細径部１ａと錠止部材３とを係合させることにより、スリーブ２への先端工具１の取付けを可能としている。
【０００３】
上記構成をした従来の衝撃工具の工具保持装置の一例を図１４を用いて説明する。
【０００４】
図に示す従来の衝撃工具の工具保持装置は、錠止部材３とスリーブ２に錠止部材３を保持する錠止孔２ａとを複数個（図では２個）設けると共に、スリーブ２外周にスリーブ２の軸方向に移動可能で、常時スプリング２０によってスリーブ２の先端２ｂ側に付勢されたホルダ４と、スリーブ２及びホルダ４外周に位置し軸方向移動が可能でスリーブ２の先端２ｂから離れる方向に軸方向移動した際にはホルダ４を先端２ｂから離れる方向に移動させるグリップ５とを有する構成をしている。
【０００５】
ホルダ４にはスリーブ２外径寸法より若干大きい内径を持つ規制部４ａと、規制部４ａよりも小さな内径寸法を持つ逃げ部４ｂとが設けられている。
【０００６】
図の上方半分で示されるように錠止部材３の外周にホルダ４の規制部４ａが位置する際には、規制部４ａが錠止部材３の外周に当接することにより錠止部材３はスリーブ２の半径方向内側に移動し、錠止部材３はスリーブ２内部に突出する。この状態では錠止部材３のスリーブ２の半径方向の移動は規制され、錠止部材３はスリーブ２内に収納された先端工具１の細径部１ａと係合可能となる。また、図の下方半分で示されるように錠止部材３の外周にホルダ４の逃げ部４ｂが位置している際には、錠止部材３のスリーブ２の半径方向の移動は許容され、スリーブ２から先端工具１を取外すことが可能となる。
【０００７】
スリーブ２に対するホルダ４の軸方向位置に応じて錠止部材３のスリーブ２の半径方向の移動を規制することにより、スリーブ２内に先端工具１を保持可能となると共に、錠止部材３のスリーブ２の半径方向の移動を許容することにより、スリーブ２から先端工具１を取外し可能となっており、ホルダ４が図に示すようにスプリング２０の付勢力によりスリーブ２の先端２ａ側に位置している際にはスリーブ２内に先端工具１を保持可能であり、スプリング２０の付勢力に抗してホルダ４をスリーブ２の先端２ａから離れるように軸方向移動させた際にはスリーブ２からの先端工具１の取外し、またはスリーブ２内への先端工具１の収納を可能としている。
【０００８】
スリーブ２からの先端工具１の取外し、またはスリーブ２内への先端工具１の収納を行うためにホルダ４をスプリング２０に抗して軸方向移動させる作業は、グリップ５をスリーブ２の先端２ａから離れるように軸方向移動させることより行っていた。
【０００９】
次に従来の衝撃工具の工具保持装置の他の例を図１５及び図１６を用いて説明する。
【００１０】
上記した従来の工具保持装置は、スリーブ２に対するホルダ４の軸方向位置に応じてスリーブ２内に先端工具１を保持する、またはスリーブ２からの先端工具１の取外し及びスリーブ２内への先端工具１の収納を可能とする構成であるが、図１５に示す従来の衝撃工具の工具保持装置は、上記したホルダ４と同様に錠止部材３のスリーブ２の半径方向の移動を規制するための規制部４ａ、錠止部材３の移動を許容する逃げ部４ｂを有するホルダ４をスリーブ２に回動可能に設けた構成をし、スリーブ２に対するホルダ４の回動位置に応じてスリーブ２内に先端工具１を保持する、またはスリーブ２からの先端工具１の取外し及びスリーブ２内への先端工具１の収納を可能とする構成をしたものである。
【００１１】
図１５に示す従来の衝撃工具の工具保持装置は、錠止部材３とスリーブ２に錠止部材３を保持する錠止孔２ａとを複数個（図では３個）設けると共に、スリーブ２外周に回動可能で、常時ねじり形スプリング２１によって一回動位置に付勢されたホルダ４と、スリーブ２及びホルダ４外周にスリーブ２に対して回動可能でホルダ４と回動不能に係合したグリップ５とを有する構成をしている。
【００１２】
図１６に示すように錠止部材３の外周にホルダ４の規制部４ａが位置する際には、規制部４ａが錠止部材３の外周に当接することにより錠止部材３はスリーブ２の半径方向内側に移動し、錠止部材３はスリーブ２内部に突出する。この状態では錠止部材３のスリーブ２の半径方向の移動は規制され、錠止部材３はスリーブ２内に収納された先端工具１の細径部１ａと係合可能となる。ホルダ４はこのように錠止部材３の外周に規制部４ａが位置する回動位置となるようにねじり形スプリング２１によって常時付勢されている。
【００１３】
また、錠止部材３の外周にホルダ４の逃げ部４ｂが位置している際には、錠止部材３のスリーブ２の半径方向の移動は許容され、スリーブ２から先端工具１を取外すことが可能となる。
【００１４】
図に示すようにスリーブ２に先端工具１を保持させた状態からねじり形スプリング２１の付勢力に抗する方向（図１６の反時計回り方向）にグリップ５を回動させることにより、錠止部材３の外周にホルダ４の逃げ部４ｂが位置し、錠止部材３の移動が許容され錠止部材３がスリーブ２の半径方向外側に移動可能となり、錠止部材３と先端工具１の細径部１ａとの係合を解除することができるため、スリーブ２から先端工具１を取外すことが可能となる。なお、スリーブ２内に先端工具１を収納する際にも同様にねじりコイルバネ２１の付勢力に抗する方向にホルダ４を回動させることにより、スリーブ２内への錠止部材３の突出を解除し、スリーブ２内に先端工具１を収納させる。
【００１５】
【発明が解決しようとする課題】
上記したような従来の工具保持装置においては、前者の構成ではグリップ５をスプリング２０の付勢力に抗してスリーブ２の軸方向に移動させない限り、先端工具１をスリーブ２内に保持させることができないものであり、後者の構成ではグリップ５をねじり形スプリング２１の付勢力に抗してグリップ５を回動させない限り、先端工具１をスリーブ２に保持させることができないものであり、先端工具の装着作業が面倒であり、作業性の低下を招くものであった。
【００１６】
本発明の目的は、上記欠点を解消し、グリップを操作することなく先端工具を装着できる工具保持装置を提供することである。
【００１７】
上記目的は、細径部を持つ先端工具を収納可能なスリーブと、該スリーブに該スリーブの半径方向に移動可能に保持される錠止部材と、前記スリーブ外周に設けられ、一動作位置では前記錠止部材の前記移動を規制し前記錠止部材を前記スリーブ内部に突出させ、他の動作位置では前記錠止部材の前記移動を許容するホルダとを有する衝撃工具であって、前記スリーブの半径方向に移動可能で、前記スリーブ内への前記先端工具の挿入によって前記スリーブの半径方向外側に移動する移動部材を前記スリーブに設けると共に、前記スリーブ外周に回動可能に設けられ、付勢手段により一回動方向に回動するよう付勢された回動部材と、前記付勢手段の付勢力に抗した状態で前記回動部材の前記スリーブに対する回動を規制し、前記移動部材の前記移動によって前記回動部材の回動規制を解除する回動規制手段とを設け、前記回動部材は回動により前記錠止部材を前記スリーブ内部に突出させるよう前記ホルダを動作させ、前記回動部材は前記ホルダと相対回動不能に設けられていることにより達成される。
【００１８】
【発明の実施の形態】
本発明衝撃工具の工具保持装置の一実施形態を図１〜図６を用いて説明する。
【００１９】
図１に示すように本発明衝撃工具の工具保持装置は、細径部１ａを持つ先端工具１を収納可能なスリーブ２と、スリーブ２の錠止孔２ａにスリーブ２の半径方向に移動可能に保持され、スリーブ２内部に突出可能な錠止部材３と、スリーブ２外周にスリーブ２の軸方向に移動可能に設けられたホルダ４と、スリーブ２及びホルダ４外周に回動可能に設けられたグリップ５と、スリーブ２の保持孔２ｃ内にスリーブ２の半径方向に移動可能に保持され、スリーブ２内部に突出可能な移動部材であるピン６と、スリーブ２外周に回動可能に設けられた回動部材７と、回動部材７に設けられた貫通孔７ａ内にスリーブ２の半径方向に移動可能に保持され、回動部材７内部に突出可能かつスリーブ２の保持孔２ｃ内に係合可能な回動規制手段を構成する係止ピン８と、断面形状が凹形状をした回動部材７の細径部分外周をほぼ覆う形状をし、係止ピン８を常時スリーブ２の半径方向内側に付勢するリング形バネ９と、一端がスリーブ２に回動不能に係合されると共に他端が回動部材７に回動不能に係合され、回動部材７を一回動位置に回動させるよう付勢する付勢手段であるねじりバネ１０と、ホルダ４をスリーブ２の先端２ａから離れる方向に常時付勢する付勢手段である圧縮バネ１１とを有する構成をしている。
【００２０】
ホルダ４にはスリーブ２外径寸法より若干大きな内径を持つ規制部４ａと、規制部４ａよりも大きな内径寸法を持つ逃げ部４ｂとが設けられていると共に、スリーブ２の先端２ｂ付近外周に設けられた軸方向に延びる長溝２ｆに常時係合する突部４ｄが設けられており、突部４ｄと長溝２ｆとの係合によりホルダ４はスリーブ２に対して回動不能かつ軸方向移動可能に係合している。
【００２１】
グリップ５はホルダ４と相対回動可能に、かつ回動部材７と相対回動不能に設けられており、スリーブ２外周に係合したＣ形リング１４によってスリーブ２の先端２ｂ側への抜け止めがされている。
【００２２】
図３に示すように錠止部材３の外周にホルダ４の規制部４ａが位置する際には、規制部４ａが錠止部材３の外周に位置することにより錠止部材３はスリーブ２の半径方向内側に移動し、錠止部材３はスリーブ２内部に突出する。この状態では錠止部材３のスリーブ２の半径方向の移動は規制され、錠止部材３はスリーブ２内に収納された先端工具１の細径部１ａと係合可能となる。また、図１に示すように錠止部材３の外周にホルダ４の逃げ部４ｂが位置している際には、錠止部材３のスリーブ２の半径方向の移動は許容される。
【００２３】
回動部材７には、図１、図３及び図６に示すようにホルダ４側端部にホルダ４側に徐々に突出するよう傾斜面を有した当接部である凸部７ｃが設けられており、ホルダ４の回動部材７側端部には回動部材７側に徐々に突出するよう傾斜面を有し、端部が凸部７ｃ端部と当接あるいは非当接可能な凸部４ｃが設けられており、ホルダ４の端部と回動部材７の端部とは圧縮バネ１１の作用により常に当接するようになっている。
【００２４】
回動部材７には図１に示すように穴溝７ｂが設けられており、穴溝７ｂ内には一端１０ａがスリーブ２の穴溝２ｄに挿入されたねじりバネ１０の他端１０ｂが挿入され、ねじりバネ１０は一端１０ａがスリーブ２に回動不能、他端１０ｂが回動部材７に回動不能となっている。ねじりバネ１０は回動部材７を図３及び図４に示す回動位置に回動させるよう付勢する。
【００２５】
図１に示す状態は、スリーブ２に先端工具１を取付けていない状態を示し、この状態では図２に示すように係止ピン８を保持する回動部材７の貫通孔７ａと、ピン６を保持するスリーブ２の保持孔２ｃとの位置がスリーブ２の半径方向において一致して、係止ピン８がリング形バネ９の付勢力により回動部材７内部に突出すると共にスリーブ２の保持孔２ｃと係合している。また、係止ピン８がピン６と当接して、係止ピン８はリング形バネ９の付勢力によりピン６をスリーブ２内部に突出させる。
【００２６】
係止ピン８がスリーブ２の保持孔２ｃと係合していることにより、回動部材７の回動は規制されており、この状態ではねじりバネ１０は回動部材７を一回動方向（図２の反時計回り方向）に回動させるよう付勢している。
【００２７】
係止ピン８がスリーブ２の保持孔２ｃと係合した状態では、回動部材７の凸部７ｃとホルダ４の凸部４ｃとは非当接の状態にあり、ホルダ４は圧縮バネ１１の付勢力によりスリーブ２の先端から離れる位置に位置しており、錠止部材３外周にホルダ４の逃げ部４ｂが位置し、錠止部材３のスリーブ２の半径方向の移動を許容した状態にある。すなわち、スリーブ２内に先端工具１を挿入可能な状態となっている。
【００２８】
図１に示す状態では、先端工具１の段差部１ｂがスリーブ２に保持されたピン６と僅かに接触した状態にあるが、この状態から更にスリーブ２内に先端工具１を挿入すると、先端工具１の段差部１ｂがリング形バネ９の付勢力に抗してピン６をスリーブ２の半径方向外側に移動させる。ピン６のスリーブ２の半径方向外側への移動により係止ピン８も同時にスリーブ２の半径方向外側へ移動し、係止ピン８とスリーブ２の保持孔２ｃとの係合は解除される。係止ピン８と保持孔２ｃとの係合が解除されることにより、回動部材７はねじりバネ１０の付勢力により図２に示す状態から反時計周り方向に回動し、図３及び図４に示す状態となる。
【００２９】
図３に示す状態では、回動部材７の回動により回動部材７とホルダ４とが凸部７ｃ端部と凸部４ｃ端部とで当接することにより、ホルダ４が圧縮バネ１１の付勢力に抗してスリーブ２の先端２ｂ側に移動し、錠止部材３の外周にホルダ４の規制部４ａが位置することで錠止部材３のスリーブ２の半径方向の移動が規制され錠止部材３をスリーブ２内部に突出させている。これにより、スリーブ２内の先端工具１の細径部１ａと錠止部材３とが係合し、スリーブ２へ先端工具１が取付けられることとなる。なお、回動部材７のねじりバネ１０の付勢力により回動する方向での回動位置の規制は図示していないが、例えば回動部材７とスリーブ２外周に設けられ回動部材７の回動方向において当接することができる段差等により行われ、回動部材７の凸部７ｃ端部とホルダ４の凸部４ｃ端部とで回動部材７とホルダ４とが当接する位置で回動部材７の回動が規制されるようになっている。
【００３０】
上記したように、本発明衝撃工具の工具保持装置によれば、スリーブ２内へ先端工具１を挿入するのみで、スリーブ２にスリーブ２の半径方向に移動可能に保持された移動部材であるピン６がスリーブ２内での先端工具１の軸方向移動によってスリーブ２の半径方向外側に移動し、このピン６の移動によって回動部材７に内部に突出可能に設けられた回動規制手段を構成する係止ピン８とスリーブ２に設けられた保持孔２ｃとの係合が解除され、回動部材７が一回動位置へ回動され、回動部材７が錠止部材３のスリーブ２の半径方向の移動を規制するようホルダ４を動作させるため、スリーブ２へ先端工具１を保持させることができる。従って、容易に先端工具１の取付け作業を行うことができる。
【００３１】
また、図３に示すようにスリーブ２に先端工具１を取付けた状態から先端工具１を取外すには、スリーブ２に対してグリップ５をねじりバネ１０の付勢力に抗して図４で示す時計回り方向に回動させることにより行われる。
【００３２】
グリップ５と回動部材７とは相対回動不能に係合されているため、グリップ５と共に回動部材７が回動し、これにより回動部材７の凸部７ｃ端部とホルダ４の凸部４ｃ端部との当接は解除され、それぞれの傾斜面によって徐々にホルダ４は圧縮バネ１１の付勢力によりスリーブ２の先端２ｂから離れる方向に移動し、錠止部材３の外周に位置するホルダ４の部分が規制部４ａから逃げ部４ｂに移行すると、錠止部材３のスリーブ２の半径方向の移動は許容され、スリーブ２内における先端工具１の細径部１ａと錠止部材３との係合が解除されることになり、スリーブ２から先端工具１を取り外すことが可能となる。
【００３３】
なお、上記したようにグリップ５を図４に示す状態から図２に示す状態まで時計回り方向に回動させると、係止ピン８がスリーブ２の保持孔２ｃと係合可能となり、この係止ピン８と保持孔２ｃとの係合により、グリップ５及び回動部材７はねじりバネ１０の付勢力に抗した状態でスリーブ２と係合し、回動が規制される状態となる。すなわち、図１及び図２に示す状態となる。
【００３４】
なお、上記したねじりバネ１０が回動部材７を一回動位置に回動させるよう付勢する付勢力は、ホルダ４を回動部材７側に付勢する圧縮バネ１１の付勢力に抗して回動部材７を回動させることができるように設定されている。
【００３５】
また、上記実施形態では、図に示すように先端工具１が段差部１ｂを有し、段差部１ｂのスリーブ２内での軸方向移動によってピン６がスリーブ２の半径方向外側に移動する構成となっていると共に、ピン６が段差部１ｂと当接しスリーブ２の半径方向外側に移動する際には先端工具１の細径部１ｂの外周に錠止部材３が位置するように設定されている。上記した移動部材であるピン６の動作は先端工具１の段差部１ｂにより行われるものに限定されるものではなく、先端工具１の外周や先端工具１の端部によってスリーブ２の半径方向外側に移動する構成であっても良い。
【００３６】
また、上記実施形態では、図２及び図４から分かるようにホルダ４がスリーブ２の軸方向に移動し錠止部材３のスリーブ２の半径方向の移動を規制するあるいは許容するために回動部材７及びグリップ５が回動する回動量を約９０°としたが、これは回動部材７及びホルダ４の凸部７ｃ、４ｃを２個設けた構成としたためであり、本発明の構成がこれに限られるものではない。
【００３７】
なお、図に示すように上記実施形態では錠止部材３及びピン６を鋼球としたが、本発明の構成がこれに限られるものではない。
【００３８】
次に本発明衝撃工具の工具保持装置の他の実施形態を図７〜図１３を用いて以下説明する。
【００３９】
図に示す本発明衝撃工具の工具保持装置は、細径部１ａを持つ先端工具１を収納可能なスリーブ２と、スリーブ２の錠止孔２ａにスリーブ２の半径方向に移動可能に保持され、スリーブ２内部に突出可能な３個の錠止部材３と、スリーブ２外周に回動可能に設けられたホルダ４と、スリーブ２及びホルダ４外周に回動可能に設けられたグリップ５と、スリーブ２の保持孔２ｃ内にスリーブ２の半径方向に移動可能に保持され、スリーブ２内部に突出可能な移動部材であるピン６と、スリーブ２外周にスリーブ２の軸方向に移動可能かつ回動可能に設けられ、更にホルダ４と回動不能に係合した回動部材７と、一端１０ａがスリーブ２に回動不能に係合されると共に他端１０ｂが回動部材７に回動不能に係合され、回動部材７を一回動位置に回動させるよう付勢する付勢手段であるねじりバネ１０と、ホルダ４と回動部材７との間に位置し回動部材７をスリーブ２の先端２ｂから離れる方向に常時付勢する付勢部材である圧縮バネ１１とを有する構成をしている。
【００４０】
ホルダ４には図に示すようにスリーブ２外周とほぼ同寸法の内径を持つ規制部４ａと規制部４ａよりも大きな内径を持つ逃げ部４ｂとを有する構成をしており、図７及び図８に示すように錠止部材３の外周にホルダ４の逃げ部４ｂが位置する際には錠止部材３のスリーブ２の半径方向の移動は許容され、図１０及び図１１に示すように錠止部材３の外周にホルダ４の規制部４ａが位置する際には錠止部材３のスリーブ２の半径方向の移動は規制され、錠止部材３はスリーブ２内部に突出する。
【００４１】
ホルダ４の回動部材７側端部外周には一定の間隔を持って形成された複数（図示せず）の凹部４ｄが設けられていると共に回動部材７のホルダ４側端部にはホルダ４の凹部４ｄと係合可能な複数の凸部７ｄが設けられており、凹部４ｄ及び凸部７ｄは常時係合し、スリーブ２の外周においてホルダ４と回動部材７とは相対回動不能に係合している。
【００４２】
また、図９及び図１２に示すようにグリップ５と回動部材７とは、グリップ５の内側に設けられた凸部５ａと回動部材７の外周に設けられた凹部７ｉとが係合することにより、相対回動不能に係合している。すなわち、グリップ５をスリーブ２に対して回動させることにより、回動部材７及びホルダ４も共に回動する構成となっている。
【００４３】
回動部材７の反ホルダ４側端部に隣接するスリーブ２外周には図１３に示すように第１の段差部２ｅが設けられており、回動部材７の反ホルダ４側端部には回動部材７がスリーブ２の先端２ｂから離れる位置に位置している際に回動方向において第１の段差部２ｅと当接可能な回動規制手段を構成する突部７ｅが設けられている。なお、回動部材７の回動方向において突部７ｅが第１の段差部２ｅに当接している状態は、回動部材７が付勢部材であるねじりバネ１０の付勢力に抗して回動した状態にある。また、図１３に示すようにスリーブ２外周には第１の段差部２ｅよりも回動部材７側に第２の段差部２ｇが設けられており、回動部材７の突部７ｅはこの第２の段差部２ｇとも回動方向において当接可能となっている。
【００４４】
回動部材７にはスリーブ２外周とほぼ同寸法の内径を持つ内径部７ｆと、内径部７ｆより大きな内径を持つ逃げ部７ｇと、内径部７ｆと逃げ部７ｇとを連結し内径部７ｆから逃げ部７ｇにかけて徐々に内径寸法が大きくなるよう傾斜した傾斜面７ｈが設けられている。回動部材７の内径部７ｆがスリーブ２の保持孔２ｃ内にスリーブ２の軸方向に移動可能に設けられたピン６の中心外周に位置することのない構成となっている。
【００４５】
また、回動部材７には図９、図１０及び図１２に示すように穴溝７ｂが設けられており、穴溝７ｂ内には一端１０ａがスリーブ２の穴溝２ｄに挿入されたねじりバネ１０の他端１０ｂが挿入され、ねじりバネ１０は一端１０ａがスリーブ２に回動不能、他端１０ｂが回動部材７に回動不能となっており、ねじりバネ１０は回動部材７を図７〜図９に示す回動位置に回動させるよう付勢する。
【００４６】
なお、本実施形態では、図に示すようにスリーブ２の先端２ｂ側外周にはホルダ４と当接するダンパ１２と、ダンパ１２の抜け止めのためのワッシャ１３、Ｃ形リング１４が設けられており、これにより先端工具１がスリーブ２の先端２ｂ側に移動して先端工具１の軸方向において先端工具１と錠止部材３とが衝突した際の衝撃を、錠止部材３及びホルダ４を介してダンパ１２により緩和することができるようにしている。更にスリーブ２の先端２ｂはキャップ１５により覆われており、キャップ１５はワッシャ１３、ダンパ１２及びグリップ５の構成により抜け止めされている。
【００４７】
なお、上記実施形態では、スリーブ２にスリーブ２の軸方向に移動可能に保持され先端工具１の細径部１ａと係合可能な錠止部材３を図に示すように鋼球とすると共に、錠止部材３のスリーブ２の軸方向の移動を規制するホルダ４を図に示すような形状としたものであるが、図８及び図９に示すような錠止部材３及びホルダ４の形状としても良いものである。
【００４８】
更に、上記実施形態では、スリーブ２内での先端工具１の段差部１ｂの軸方向移動によって移動部材であるピン６がスリーブ２の半径方向外側に移動する構成としたが、例えばピン６は先端工具１の外周や端部によりスリーブ２の半径方向外側に移動されるようにした構成であっても良く、本発明がこの構成に限定されるものではない。
【００４９】
また、スリーブ２内での先端工具１の軸方向移動により移動部材であるピン６がスリーブ２の半径方向外側に移動する際には、先端工具１の細径部１ａの外周に錠止部材３が位置する状態にあるよう、本実施形態ではピン６を動作させる先端工具１の段差部１ａと細径部１ｂの距離に合わせてピン６と錠止部材３との距離が設定されている。
【００５０】
図９はスリーブ２に先端工具１を取付けていない状態であるが、この状態では回動部材７はホルダ４と回動部材７との間に位置する圧縮バネ１１の付勢力によりスリーブ２の先端２ｂから離れる方向に付勢されていると共に回動部材７の突部７ｅが回動方向においてスリーブ２の第１の段差部２ｅと当接している。なお、この状態では回動部材７はねじりバネ１０の付勢力に抗して回動が規制された状態にある。
【００５１】
また、ホルダ４は錠止部材３の外周に逃げ部４ｂが位置する回動位置にあり、錠止部材３はスリーブ２の半径方向に移動可能な状態にある。
【００５２】
更にスリーブ２の保持孔２ｃに保持されたピン６は、圧縮バネ１１によってスリーブ２の先端２ｂから離れる方向に付勢された回動部材７の傾斜面７ｈによってスリーブ２内に突出するようスリーブ２の半径方向内側に付勢されている。
【００５３】
図９に示す状態から、先端工具１を更にスリーブ２内に挿入すると先端工具１の段差部１ｂによってピン６がスリーブ２の半径方向外側に付勢され、これにより傾斜面７ｈを介して回動部材７を圧縮バネ１１の付勢力に抗してスリーブ２の先端２ｂ側に移動させる。
【００５４】
回動部材７の先端２ｂ側への移動により回動部材７の突部７ｅとスリーブ２の第１の段差部２ｅへの当接が解除され、回動部材７はねじりバネ１０の付勢力により図９に示す状態から時計回り方向に約６０°回動した状態で、回動部材７の突部７ｅが第２の段差部２ｇに当接して回動部材７の回動は規制され、図１２に示す状態となる。
【００５５】
回動部材７の回動と共にホルダ４も回動することにより、図８に示すように錠止部材３の外周にホルダ４の逃げ部４ｂが位置していた状態から図１１に示すように錠止部材３の外周にホルダ４の規制部４ａが位置する状態となり、錠止部材３のスリーブ２の半径方向の移動が規制され錠止部材３はスリーブ２内部へ突出し、図１０に示すようにスリーブ２内部において錠止部材３と先端工具１の細径部１ａとが係合し、スリーブ２への先端工具１の取付けが行われる。
【００５６】
上記したように、本発明衝撃工具の工具保持装置によれば、スリーブ２内へ先端工具１を挿入するのみで、スリーブ２にスリーブ２の半径方向に移動可能に保持された移動部材であるピン６がスリーブ２内での先端工具１の軸方向移動によりスリーブ２の半径方向外側に移動し、ピン６の移動によって回動部材７が軸方向に移動することにより回動規制手段を構成する突部７ｅと第１の段差部２ｅとの回動方向における当接が解除され、回動部材７が一回動位置へ回動して、錠止部材３のスリーブ２の半径方向の移動を規制するようホルダ４を動作させるため、スリーブ２へ先端工具１を保持させることができる。従って、容易に先端工具１の取付け作業を行うことができるようになる。
【００５７】
また、図１０に示すようにスリーブ２に先端工具１を取付けた状態から先端工具１を取外すには、スリーブ２に対してグリップ５をねじりバネ１０の付勢力に抗して図１２で示す反時計回り方向に回動させることにより行われる。
【００５８】
グリップ５を図１２で示す反時計回りに回動させることにより、回動部材７及びホルダ４がグリップ５と共に回動し、図１２の状態から約６０°回動させると、回動部材７はホルダ４と回動部材７との間に設けられた圧縮バネ１１の付勢力により回動部材７の反ホルダ４側端部の突部７ｅが第１の段差部２ｅから落ち込み、突部７ｅが回動部材７の回動方向において第１の段差部２ｅと当接し、回動部材７はねじりバネ１０の付勢力に抗した状態で回動が規制され、図７〜図９に示す状態となる。
【００５９】
グリップ５を図１２に示す状態から反時計回り方向に約６０°回動させることにより、ホルダ４も図１１に示す状態から約６０°回動することとなり、スリーブ２に保持された錠止部材３の外周にホルダ４の規制部４ａが位置していた状態から錠止部材３の外周にホルダ４の逃げ部４ｂが位置する状態となり、錠止部材３のスリーブ２の半径方向の移動が許容され、スリーブ２から先端工具１を取外すことが可能となる。なお、グリップ５を図１２に示す状態から反時計回り方向に６０°以上回動させると、回動部材７の突部７ｅが第１の段差部２ｅに落ち込み、その後グリップ５の回動操作を解除すると、回動部材７及びグリップ５がねじりバネ１０の付勢力により回動して回動部材７の突部７ｅが第１の段差部２ｅに当接することにより回動部材７の回動位置が規制されるものであるため、グリップ５を回動させスリーブ２から先端工具１を取外す作業も容易に行うことができるものである。
【００６０】
また、上記実施形態では、図９及び図１２から分かるように回動部材７及びグリップ５が回動する回動量を約６０°としたが、これは図１１に示すように錠止部材３及びホルダ４に逃げ部４ｂをそれぞれ３個設けた構成とし、錠止部材３が逃げ部４ｂ間のほぼ中央の規制部４ａの位置に位置するようにしたためであり、これにより作業時の振動等により若干ホルダ４が回動したとしても錠止部材３のスリーブ２の半径方向の移動を確実に規制することができるようにしたものである。
【００６１】
なお、図に示すように上記実施形態では錠止部材３及びピン６を鋼球としたが、本発明の構成がこれに限られるものではない。錠止部材３を図１５、図１６に示すような構成とすると共にホルダ４を同様に図１５、図１６に示すような構成とすることも可能である。
【００６２】
上記したように本発明によれば、スリーブ２の半径方向に移動可能で、スリーブ２内での先端工具１の軸方向移動によってスリーブ２の半径方向外側に移動する移動部材であるピン６をスリーブ２に設けると共に、移動部材であるピン６の移動によって錠止部材３の移動を規制するようホルダ４を動作させる動作手段を構成する回動部材７を設けた構成としたことにより、スリーブ２内に先端工具１を挿入するのみでスリーブ２へ先端工具１を保持させることができるようになり、先端工具１の取付け作業を容易に行うことができるようになる。
【００６３】
なお、図１〜図６で示した実施形態は、先端工具１がスリーブ２内に挿入され、ピン６がスリーブ２の半径方向外側に移動すると、回動部材７が回動して回動部材７がホルダ４をスリーブ２の軸方向に移動させることにより、錠止部材３のスリーブ２の半径方向の移動を規制しスリーブ２に先端工具１を保持する構成としたが、ホルダ４を図７〜図１３に示す実施形態のようにスリーブ２に対して回動可能で回動位置により錠止部材３の移動を規制または許容する構成に変更すると共にホルダ４と回動部材７とを回動不能に係合させた構成とすることも可能である。
【００６４】
【発明の効果】
上記したように本発明によれば、スリーブの半径方向に移動可能で、スリーブ内での先端工具の軸方向移動によってスリーブの半径方向外側に移動する移動部材をスリーブに設けると共に、移動部材の前記移動によって錠止部材のスリーブの半径方向の移動を規制するようホルダを動作させる動作手段を設けた構成とすることにより、スリーブ内に先端工具を挿入するのみでスリーブに先端工具を取付ける操作を行うことができ、作業性の向上を図ることができる衝撃工具の工具保持装置を提供することができるようになる。
【図面の簡単な説明】
【図１】本発明衝撃工具の工具保持装置の一実施形態を示す縦断側面図。
【図２】図１のＡ−Ａ線断面図。
【図３】先端工具を保持した状態を示す図１の衝撃工具の工具保持装置の動作説明図。
【図４】図３のＢ−Ｂ線断面図。
【図５】本発明衝撃工具の工具保持装置を構成する図１の回動部材を示す斜視図。
【図６】本発明衝撃工具の工具保持装置を構成する図１のホルダを示す斜視図。
【図７】本発明衝撃工具の工具保持装置の他の実施形態を示す縦断側面図。
【図８】図７のＣ−Ｃ線断面図。
【図９】図７のＤ−Ｄ線断面図。
【図１０】先端工具を保持した状態を示す図７の衝撃工具の工具保持装置の動作説明図。
【図１１】図８のＥ−Ｅ線断面図。
【図１２】図８のＦ−Ｆ線断面図。
【図１３】本発明衝撃工具の工具保持装置を構成する図７のスリーブを示す斜視図。
【図１４】従来の衝撃工具の工具保持装置の一例を示す縦断側面図。
【図１５】従来の衝撃工具の工具保持装置の他の例を示す縦断側面図。
【図１６】図１５のＧ−Ｇ線断面図。
【符号の説明】
１は先端工具、１ａは細径部、１ｂは段差部、２はスリーブ、２ａは錠止孔、２ｂは先端、２ｃは円形孔、２ｄは穴溝、２ｅは段差部、３は錠止部材、４はホルダ、４ａは規制部、４ｂは逃げ部、４ｃは凸部、４ｄは突部、５はグリップ、５ａは凸部、６は移動部材、７は回動部材、７ａは貫通孔、７ｂは穴溝、７ｃは凸部、７ｄは凸部、７ｅは突部、７ｆは内径部、７ｇは逃げ部、７ｈは傾斜面、７ｉは凹部、８は係止ピン、９はリング形バネ、１０はねじりバネ、１０ａ、１０ｂは端部、１１は圧縮バネ、１２はダンパ、１３はワッシャ、１４はＣ形リング、１５はキャップである。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tool holding device for impact tools such as electric hammers and hammer drills.
[0002]
[Prior art]
As shown in FIGS. 14 and 15, the tool holding device for the impact tool is basically a lock that is held by the sleeve 2 so as to be movable in the radial direction of the sleeve 2 with the tip tool 1 housed in the sleeve 2. The sleeve 3 is moved by moving the member 3 radially inward of the sleeve 2 to restrict the radially outward movement, and by engaging the locking member 3 with the small diameter portion 1a having a smaller outer diameter than the other portion of the tip tool 1. It is possible to attach the end tool 1 to 2.
[0003]
An example of a conventional tool holding device for an impact tool having the above configuration will be described with reference to FIG.
[0004]
The conventional tool holding device for an impact tool shown in the figure is provided with a plurality of (two in the figure) locking holes 2a for holding the locking member 3 in the locking member 3 and the sleeve 2, and a sleeve on the outer periphery of the sleeve 2. 2 is movable in the axial direction of the holder 2, and is always urged toward the tip 2 b of the sleeve 2 by the spring 20. When moving in the axial direction, the holder 5 is configured to move in a direction away from the tip 2b.
[0005]
The holder 4 is provided with a restricting portion 4a having an inner diameter slightly larger than the outer diameter of the sleeve 2 and an escape portion 4b having an inner diameter smaller than the restricting portion 4a.
[0006]
As shown in the upper half of the figure, when the restricting portion 4a of the holder 4 is positioned on the outer periphery of the locking member 3, the restricting portion 4a abuts on the outer periphery of the locking member 3 so that the locking member 3 becomes a sleeve. 2, the locking member 3 protrudes into the sleeve 2. In this state, the movement of the locking member 3 in the radial direction of the sleeve 2 is restricted, and the locking member 3 can be engaged with the small-diameter portion 1 a of the tip tool 1 housed in the sleeve 2. When the escape portion 4b of the holder 4 is positioned on the outer periphery of the locking member 3 as shown in the lower half of the figure, the sleeve 2 of the locking member 3 is allowed to move in the radial direction, and the sleeve It becomes possible to remove the tip tool 1 from 2.
[0007]
By restricting the radial movement of the sleeve 2 of the locking member 3 according to the axial position of the holder 4 with respect to the sleeve 2, the tip tool 1 can be held in the sleeve 2, and the sleeve of the locking member 3. 2 allows the tool 2 to be removed from the sleeve 2 so that the holder 4 is positioned on the tip 2a side of the sleeve 2 by the biasing force of the spring 20 as shown in the figure. When the holder 4 is moved in the axial direction so as to move away from the tip 2 a of the sleeve 2 against the biasing force of the spring 20, the tip tool 1 can be held in the sleeve 2. The tip tool 1 can be removed or the tip tool 1 can be stored in the sleeve 2.
[0008]
In order to remove the tip tool 1 from the sleeve 2 or to move the holder 4 in the axial direction against the spring 20 in order to store the tip tool 1 in the sleeve 2, the grip 5 is moved from the tip 2 a of the sleeve 2. It was done by moving it in the axial direction to leave.
[0009]
Next, another example of a conventional tool holding device for an impact tool will be described with reference to FIGS.
[0010]
The above-described conventional tool holding device holds the tip tool 1 in the sleeve 2 according to the axial position of the holder 4 with respect to the sleeve 2, or removes the tip tool 1 from the sleeve 2 and the tip tool into the sleeve 2. The conventional tool holding device for an impact tool shown in FIG. 15 is for restricting the radial movement of the sleeve 2 of the locking member 3 in the same manner as the holder 4 described above. The holder 4 having the restricting portion 4a and the escape portion 4b that allows the movement of the locking member 3 is provided on the sleeve 2 so as to be rotatable, and the holder 4 is placed in the sleeve 2 according to the rotation position of the holder 4 with respect to the sleeve 2. The tip tool 1 is held, or the tip tool 1 can be removed from the sleeve 2 and the tip tool 1 can be stored in the sleeve 2.
[0011]
A conventional tool holding device for an impact tool shown in FIG. 15 is provided with a plurality of (three in the figure) locking holes 2 a for holding the locking member 3 in the locking member 3 and the sleeve 2, and on the outer periphery of the sleeve 2. The holder 4 that is rotatable and is always urged to a rotational position by a torsion spring 21, and the sleeve 2 and the outer periphery of the holder 4 are rotatable with respect to the sleeve 2 and engaged with the holder 4 so as not to rotate. The grip 5 is included.
[0012]
As shown in FIG. 16, when the restricting portion 4 a of the holder 4 is positioned on the outer periphery of the locking member 3, the restricting portion 4 a comes into contact with the outer periphery of the locking member 3, so that the locking member 3 The locking member 3 protrudes into the sleeve 2. In this state, the movement of the locking member 3 in the radial direction of the sleeve 2 is restricted, and the locking member 3 can be engaged with the small-diameter portion 1 a of the tip tool 1 housed in the sleeve 2. The holder 4 is constantly urged by the torsion spring 21 so that the holder 4 is in the rotational position where the restricting portion 4a is located on the outer periphery of the locking member 3 as described above.
[0013]
Further, when the escape portion 4 b of the holder 4 is located on the outer periphery of the locking member 3, the movement of the locking member 3 in the radial direction of the sleeve 2 is allowed, and the tip tool 1 can be removed from the sleeve 2. It becomes possible.
[0014]
As shown in the figure, the locking member is rotated by rotating the grip 5 in a direction (counterclockwise direction in FIG. 16) against the urging force of the torsion spring 21 from the state in which the tip tool 1 is held on the sleeve 2. 3 is located on the outer periphery of the holder 4, the movement of the locking member 3 is allowed, the locking member 3 can be moved radially outward of the sleeve 2, and the small diameter of the locking member 3 and the tip tool 1. Since the engagement with the portion 1 a can be released, the tip tool 1 can be removed from the sleeve 2. Similarly, when the tip tool 1 is stored in the sleeve 2, the protrusion of the locking member 3 into the sleeve 2 is released by rotating the holder 4 in a direction against the urging force of the torsion coil spring 21. Then, the tip tool 1 is stored in the sleeve 2.
[0015]
[Problems to be solved by the invention]
In the conventional tool holding device as described above, in the former configuration, the tip tool 1 can be held in the sleeve 2 unless the grip 5 is moved in the axial direction of the sleeve 2 against the biasing force of the spring 20. In the latter configuration, the tip tool 1 cannot be held by the sleeve 2 unless the grip 5 is rotated against the urging force of the torsion spring 21, and the tip tool 1 cannot be held. The mounting work is troublesome and causes a decrease in workability.
[0016]
An object of the present invention is to provide a tool holding device that can eliminate the above-mentioned drawbacks and can mount a tip tool without operating a grip.
[0017]
The above purpose is A sleeve having a small diameter portion capable of storing a tip tool, a locking member held by the sleeve so as to be movable in a radial direction of the sleeve, and provided on an outer periphery of the sleeve; An impact tool having a holder that restricts the movement, protrudes the locking member into the sleeve, and allows the movement of the locking member at other operating positions, and is movable in the radial direction of the sleeve A moving member that moves radially outward of the sleeve when the tip tool is inserted into the sleeve is provided on the sleeve, and is provided rotatably on the outer periphery of the sleeve. A pivot member biased to pivot to the sleeve, and the pivot of the pivot member with respect to the sleeve in a state resisting the bias force of the bias means, and the movement of the movable member. And a rotation restricting means for releasing the rotation restriction of the rotation member. The rotation member operates the holder so that the locking member protrudes into the sleeve by rotation, and the rotation member Is provided so that it cannot rotate relative to the holder. Is achieved.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of a tool holding device for an impact tool of the present invention will be described with reference to FIGS.
[0019]
As shown in FIG. 1, the tool holding device for an impact tool of the present invention is capable of moving in the radial direction of the sleeve 2 in a sleeve 2 that can store a tip tool 1 having a small diameter portion 1a and a locking hole 2a of the sleeve 2. A locking member 3 that is held and can protrude into the sleeve 2, a holder 4 that is provided on the outer periphery of the sleeve 2 so as to be movable in the axial direction of the sleeve 2, and that is rotatably provided on the outer periphery of the sleeve 2 and the holder 4. The grip 5 is held in the holding hole 2c of the sleeve 2 so as to be movable in the radial direction of the sleeve 2, and is provided on the outer periphery of the sleeve 2 so as to be rotatable. The rotation member 7 is held in a through hole 7 a provided in the rotation member 7 so as to be movable in the radial direction of the sleeve 2, can protrude into the rotation member 7, and is engaged in the holding hole 2 c of the sleeve 2. Configure possible rotation restricting means A locking pin 8, a ring-shaped spring 9 that has a shape that substantially covers the outer periphery of the small-diameter portion of the rotating member 7 having a concave cross-sectional shape, and constantly biases the locking pin 8 radially inward of the sleeve 2; One end is non-rotatably engaged with the sleeve 2 and the other end is non-rotatably engaged with the rotation member 7 to urge the rotation member 7 to rotate to one rotation position. The device includes a torsion spring 10 as a means and a compression spring 11 as a biasing means for constantly biasing the holder 4 in a direction away from the tip 2a of the sleeve 2.
[0020]
The holder 4 is provided with a restricting portion 4a having an inner diameter slightly larger than the outer diameter size of the sleeve 2 and an escape portion 4b having an inner diameter size larger than the restricting portion 4a, and is provided on the outer periphery near the tip 2b of the sleeve 2. A protrusion 4d that is always engaged with the elongated groove 2f extending in the axial direction is provided, and the holder 4 cannot rotate with respect to the sleeve 2 but can move in the axial direction by the engagement of the protrusion 4d and the long groove 2f. Is engaged.
[0021]
The grip 5 is provided so as to be able to rotate relative to the holder 4 and not to rotate relative to the rotating member 7, and prevents the sleeve 2 from coming off toward the tip 2 b side by a C-shaped ring 14 engaged with the outer periphery of the sleeve 2. Has been.
[0022]
As shown in FIG. 3, when the restricting portion 4 a of the holder 4 is located on the outer periphery of the locking member 3, the restricting portion 4 a is located on the outer periphery of the locking member 3, so that the locking member 3 has a radius of the sleeve 2. The locking member 3 protrudes into the sleeve 2. In this state, the movement of the locking member 3 in the radial direction of the sleeve 2 is restricted, and the locking member 3 can be engaged with the small-diameter portion 1 a of the tip tool 1 housed in the sleeve 2. As shown in FIG. 1, when the escape portion 4b of the holder 4 is positioned on the outer periphery of the locking member 3, the radial movement of the sleeve 2 of the locking member 3 is allowed.
[0023]
As shown in FIGS. 1, 3, and 6, the rotating member 7 is provided with a convex portion 7 c that is an abutting portion having an inclined surface so as to gradually protrude toward the holder 4 side at the end portion on the holder 4 side. The end of the holder 4 on the side of the rotating member 7 has an inclined surface that gradually protrudes toward the side of the rotating member 7, and the end can be in contact with or not in contact with the end of the protrusion 7 c. A portion 4 c is provided, and the end portion of the holder 4 and the end portion of the rotating member 7 are always in contact with each other by the action of the compression spring 11.
[0024]
As shown in FIG. 1, the rotation member 7 is provided with a hole groove 7b, and the other end 10b of the torsion spring 10 having one end 10a inserted into the hole groove 2d of the sleeve 2 is inserted into the hole groove 7b. The torsion spring 10 has one end 10 a that cannot rotate with respect to the sleeve 2 and the other end 10 b that cannot rotate with respect to the rotating member 7. The torsion spring 10 urges the rotation member 7 to rotate to the rotation position shown in FIGS.
[0025]
The state shown in FIG. 1 shows a state in which the tip tool 1 is not attached to the sleeve 2. In this state, the through hole 7 a of the rotating member 7 that holds the locking pin 8 and the pin 6 are connected as shown in FIG. 2. The position of the holding sleeve 2 with the holding hole 2c coincides in the radial direction of the sleeve 2, and the locking pin 8 projects into the rotating member 7 by the biasing force of the ring-shaped spring 9, and the holding hole 2c of the sleeve 2 Is engaged. Further, the locking pin 8 comes into contact with the pin 6, and the locking pin 8 projects the pin 6 into the sleeve 2 by the biasing force of the ring-shaped spring 9.
[0026]
Since the locking pin 8 is engaged with the holding hole 2c of the sleeve 2, the rotation of the rotating member 7 is restricted. In this state, the torsion spring 10 moves the rotating member 7 in one rotation direction ( It is biased to rotate in the counterclockwise direction of FIG.
[0027]
When the locking pin 8 is engaged with the holding hole 2 c of the sleeve 2, the convex portion 7 c of the rotating member 7 and the convex portion 4 c of the holder 4 are not in contact with each other. It is located at a position away from the tip of the sleeve 2 due to the urging force, and the escape portion 4b of the holder 4 is located on the outer periphery of the locking member 3 so that the radial movement of the sleeve 2 of the locking member 3 is allowed. . That is, the tip tool 1 can be inserted into the sleeve 2.
[0028]
In the state shown in FIG. 1, the stepped portion 1 b of the tip tool 1 is slightly in contact with the pin 6 held by the sleeve 2. If the tip tool 1 is further inserted into the sleeve 2 from this state, the tip tool 1 is inserted. 1 step portion 1 b moves the pin 6 to the outside in the radial direction of the sleeve 2 against the urging force of the ring-shaped spring 9. As the pin 6 moves outward in the radial direction of the sleeve 2, the locking pin 8 also moves outward in the radial direction of the sleeve 2, and the engagement between the locking pin 8 and the holding hole 2 c of the sleeve 2 is released. When the engagement between the locking pin 8 and the holding hole 2c is released, the rotating member 7 is rotated counterclockwise from the state shown in FIG. 2 by the urging force of the torsion spring 10. FIG. The state shown in FIG.
[0029]
In the state shown in FIG. 3, the rotation of the rotation member 7 causes the rotation member 7 and the holder 4 to come into contact with the end of the projection 7 c and the end of the projection 4 c, so that the holder 4 is attached to the compression spring 11. The sleeve 2 moves to the tip 2b side against the force, and the restricting portion 4a of the holder 4 is positioned on the outer periphery of the locking member 3, whereby the movement of the sleeve 2 of the locking member 3 in the radial direction is restricted and locked. The member 3 is protruded into the sleeve 2. As a result, the small diameter portion 1 a of the tip tool 1 in the sleeve 2 and the locking member 3 are engaged, and the tip tool 1 is attached to the sleeve 2. Although regulation of the rotation position in the direction of rotation by the biasing force of the torsion spring 10 of the rotation member 7 is not shown, for example, the rotation of the rotation member 7 provided on the outer periphery of the rotation member 7 and the sleeve 2 is not shown. Rotation is performed at a position where the rotating member 7 and the holder 4 come into contact with each other between the projecting portion 7c end of the rotating member 7 and the projecting portion 4c end of the holder 4. The rotation of the member 7 is restricted.
[0030]
As described above, according to the tool holding device for an impact tool of the present invention, a pin which is a moving member that is held by the sleeve 2 so as to be movable in the radial direction of the sleeve 2 only by inserting the tip tool 1 into the sleeve 2. 6 is configured to move to the outside in the radial direction of the sleeve 2 by the axial movement of the tip tool 1 in the sleeve 2, and to constitute a rotation restricting means provided so as to protrude inside the rotating member 7 by the movement of the pin 6. The engaging pin 8 and the holding hole 2c provided in the sleeve 2 are disengaged, the rotating member 7 is rotated to one rotation position, and the rotating member 7 is connected to the sleeve 2 of the locking member 3. Since the holder 4 is operated so as to restrict the movement in the radial direction, the tip tool 1 can be held on the sleeve 2. Therefore, the attachment work of the tip tool 1 can be easily performed.
[0031]
In order to remove the tip tool 1 from the state in which the tip tool 1 is attached to the sleeve 2 as shown in FIG. 3, the grip 5 is against the urging force of the torsion spring 10 against the sleeve 2 as shown in FIG. This is done by rotating in the turning direction.
[0032]
Since the grip 5 and the rotation member 7 are engaged with each other so as not to rotate relative to each other, the rotation member 7 rotates together with the grip 5, and thereby the convex portion 7 c end of the rotation member 7 and the convex of the holder 4. The contact with the end of the portion 4c is released, and the holder 4 is gradually moved away from the tip 2b of the sleeve 2 by the urging force of the compression spring 11 by each inclined surface, and is positioned on the outer periphery of the locking member 3. When the portion of the holder 4 moves from the restricting portion 4a to the relief portion 4b, the locking member 3 is allowed to move in the radial direction of the sleeve 2, and the small diameter portion 1a of the tip tool 1 and the locking member 3 in the sleeve 2 are allowed to move. Thus, the tip tool 1 can be removed from the sleeve 2.
[0033]
When the grip 5 is rotated clockwise from the state shown in FIG. 4 to the state shown in FIG. 2 as described above, the locking pin 8 can be engaged with the holding hole 2c of the sleeve 2, and this locking Due to the engagement between the pin 8 and the holding hole 2c, the grip 5 and the rotating member 7 are engaged with the sleeve 2 against the urging force of the torsion spring 10, and the rotation is restricted. That is, the state shown in FIGS. 1 and 2 is obtained.
[0034]
The urging force that urges the torsion spring 10 to rotate the rotation member 7 to the one rotation position resists the urging force of the compression spring 11 that urges the holder 4 toward the rotation member 7. Thus, the rotation member 7 is set so as to be rotated.
[0035]
Moreover, in the said embodiment, as shown to a figure, the tip tool 1 has the level | step-difference part 1b, and the structure to which the pin 6 moves to the radial direction outer side of the sleeve 2 by the axial direction movement in the sleeve 2 of the level | step-difference part 1b In addition, when the pin 6 contacts the stepped portion 1b and moves outward in the radial direction of the sleeve 2, the locking member 3 is set to be positioned on the outer periphery of the small-diameter portion 1b of the tip tool 1. . The operation of the pin 6 that is the moving member is not limited to that performed by the step portion 1b of the tip tool 1, but is moved outwardly in the radial direction of the sleeve 2 by the outer periphery of the tip tool 1 or the end portion of the tip tool 1. The structure which moves may be sufficient.
[0036]
In the above embodiment, as can be seen from FIGS. 2 and 4, the holder 4 moves in the axial direction of the sleeve 2, and the rotation member is used to restrict or permit the movement of the locking member 3 in the radial direction of the sleeve 2. 7 and the grip 5 are rotated by about 90 °. This is because the two convex portions 7c and 4c of the rotating member 7 and the holder 4 are provided, and the configuration of the present invention is this. It is not limited to.
[0037]
As shown in the figure, in the above embodiment, the locking member 3 and the pin 6 are steel balls, but the configuration of the present invention is not limited to this.
[0038]
Next, another embodiment of the tool holding device for an impact tool of the present invention will be described below with reference to FIGS.
[0039]
The tool holding device for an impact tool of the present invention shown in the figure is held by a sleeve 2 capable of storing a tip tool 1 having a small diameter portion 1a, and a locking hole 2a of the sleeve 2 so as to be movable in the radial direction of the sleeve 2, Three locking members 3 that can protrude into the sleeve 2, a holder 4 that is rotatably provided on the outer periphery of the sleeve 2, a grip 5 that is rotatably provided on the outer periphery of the sleeve 2 and the holder 4, and a sleeve 2 is held in the holding hole 2c so as to be movable in the radial direction of the sleeve 2, and is a pin 6 that is a movable member that can protrude into the sleeve 2, and is movable in the axial direction of the sleeve 2 and rotatable on the outer periphery of the sleeve 2. Further, a rotating member 7 that is non-rotatably engaged with the holder 4 and one end 10 a are non-rotatably engaged with the sleeve 2 and the other end 10 b is non-rotatably engaged with the rotating member 7. The rotating member 7 is rotated to one rotating position. A torsion spring 10 that is an urging means for urging the urging member and a urging member that is located between the holder 4 and the rotating member 7 and constantly urges the rotating member 7 in a direction away from the distal end 2 b of the sleeve 2. It has a configuration having a certain compression spring 11.
[0040]
As shown in the figure, the holder 4 has a configuration having a restricting portion 4a having an inner diameter substantially the same as the outer periphery of the sleeve 2 and a relief portion 4b having an inner diameter larger than the restricting portion 4a. As shown in FIG. 10, when the escape portion 4b of the holder 4 is positioned on the outer periphery of the locking member 3, the sleeve 2 of the locking member 3 is allowed to move in the radial direction. As shown in FIGS. When the restricting portion 4 a of the holder 4 is located on the outer periphery of the member 3, the movement of the locking member 3 in the radial direction of the sleeve 2 is restricted, and the locking member 3 projects into the sleeve 2.
[0041]
A plurality (not shown) of recesses 4d formed at regular intervals are provided on the outer periphery of the end of the rotating member 7 on the holder 4 and a holder is provided on the end of the rotating member 7 on the holder 4 side. A plurality of convex portions 7d that can be engaged with the four concave portions 4d are provided. The concave portions 4d and the convex portions 7d are always engaged, and the holder 4 and the rotating member 7 cannot be relatively rotated on the outer periphery of the sleeve 2. Is engaged.
[0042]
Further, as shown in FIGS. 9 and 12, the grip 5 and the rotating member 7 are engaged with a convex portion 5 a provided inside the grip 5 and a concave portion 7 i provided on the outer periphery of the rotating member 7. By this, it is engaged so that relative rotation is impossible. That is, when the grip 5 is rotated with respect to the sleeve 2, the rotating member 7 and the holder 4 are also rotated.
[0043]
As shown in FIG. 13, a first step portion 2 e is provided on the outer periphery of the sleeve 2 adjacent to the end of the rotating member 7 on the side opposite to the holder 4, and on the end of the rotating member 7 on the side opposite to the holder 4. A protrusion 7e is provided that constitutes a rotation restricting means that can come into contact with the first step portion 2e in the rotation direction when the rotation member 7 is located at a position away from the tip 2b of the sleeve 2. . Note that the state in which the protrusion 7e is in contact with the first stepped portion 2e in the rotation direction of the rotation member 7 rotates against the urging force of the torsion spring 10 that is the urging member. It is in a moving state. Further, as shown in FIG. 13, a second step 2g is provided on the outer periphery of the sleeve 2 closer to the rotating member 7 than the first step 2e. The two stepped portions 2g can be brought into contact with each other in the rotation direction.
[0044]
An inner diameter portion 7f having an inner diameter substantially the same as the outer circumference of the sleeve 2, an escape portion 7g having an inner diameter larger than the inner diameter portion 7f, and the inner diameter portion 7f and the escape portion 7g are connected to the rotating member 7 from the inner diameter portion 7f. An inclined surface 7h that is inclined so as to gradually increase the inner diameter dimension over the escape portion 7g is provided. The inner diameter portion 7 f of the rotating member 7 is configured not to be positioned on the outer periphery of the center of the pin 6 provided in the holding hole 2 c of the sleeve 2 so as to be movable in the axial direction of the sleeve 2.
[0045]
Further, as shown in FIGS. 9, 10 and 12, the rotating member 7 is provided with a hole groove 7b, and one end 10a is inserted into the hole groove 2d of the sleeve 2 in the hole groove 7b. 10, the other end 10b of the torsion spring 10 is inserted into the sleeve 2, and the other end 10b of the torsion spring 10 cannot be rotated into the rotating member 7. 7 to FIG. 9 is urged to rotate.
[0046]
In this embodiment, as shown in the figure, a damper 12 that contacts the holder 4, a washer 13 for preventing the damper 12 from coming off, and a C-shaped ring 14 are provided on the outer periphery on the tip 2 b side of the sleeve 2. Thus, the impact when the tip tool 1 moves to the tip 2b side of the sleeve 2 and the tip tool 1 and the locking member 3 collide in the axial direction of the tip tool 1 is passed through the locking member 3 and the holder 4. The damper 12 can be used for relaxation. Further, the tip 2 b of the sleeve 2 is covered with a cap 15, and the cap 15 is prevented from coming off by the configuration of the washer 13, the damper 12 and the grip 5.
[0047]
In the above embodiment, the locking member 3 held by the sleeve 2 so as to be movable in the axial direction of the sleeve 2 and engageable with the small diameter portion 1a of the tip tool 1 is a steel ball as shown in the figure, The holder 4 for restricting the axial movement of the sleeve 2 of the locking member 3 is shaped as shown in the figure, but the shape of the locking member 3 and the holder 4 as shown in FIGS. Is also good.
[0048]
Furthermore, in the above-described embodiment, the pin 6 as the moving member is moved outward in the radial direction of the sleeve 2 by the axial movement of the step portion 1b of the tip tool 1 in the sleeve 2. The configuration may be such that the sleeve 1 is moved outward in the radial direction of the sleeve 2 by the outer periphery or the end of the tool 1, and the present invention is not limited to this configuration.
[0049]
Further, when the pin 6 as a moving member moves outward in the radial direction of the sleeve 2 by the axial movement of the tip tool 1 in the sleeve 2, the locking member 3 is placed on the outer periphery of the small diameter portion 1 a of the tip tool 1. In this embodiment, the distance between the pin 6 and the locking member 3 is set in accordance with the distance between the stepped portion 1a of the tip tool 1 that operates the pin 6 and the small diameter portion 1b.
[0050]
FIG. 9 shows a state in which the tip tool 1 is not attached to the sleeve 2. In this state, the rotating member 7 is moved by the urging force of the compression spring 11 positioned between the holder 4 and the rotating member 7. The projection 7e of the rotating member 7 is urged in a direction away from 2b and is in contact with the first step 2e of the sleeve 2 in the rotating direction. In this state, the rotation member 7 is in a state where the rotation is restricted against the urging force of the torsion spring 10.
[0051]
Further, the holder 4 is in a rotational position where the escape portion 4 b is located on the outer periphery of the locking member 3, and the locking member 3 is in a state of being movable in the radial direction of the sleeve 2.
[0052]
Further, the pin 6 held in the holding hole 2c of the sleeve 2 protrudes into the sleeve 2 by the inclined surface 7h of the rotating member 7 biased in a direction away from the tip 2b of the sleeve 2 by the compression spring 11. It is biased radially inward.
[0053]
When the tip tool 1 is further inserted into the sleeve 2 from the state shown in FIG. 9, the stepped portion 1b of the tip tool 1 biases the pin 6 radially outward of the sleeve 2, thereby rotating through the inclined surface 7h. The member 7 is moved to the tip 2b side of the sleeve 2 against the urging force of the compression spring 11.
[0054]
Due to the movement of the rotating member 7 toward the distal end 2 b, the contact between the protrusion 7 e of the rotating member 7 and the first stepped portion 2 e of the sleeve 2 is released, and the rotating member 7 is moved by the biasing force of the torsion spring 10. 9, the projection 7e of the rotating member 7 abuts against the second step portion 2g, and the rotation of the rotating member 7 is restricted. The state shown in FIG.
[0055]
By rotating the holder 4 together with the rotation of the rotation member 7, the lock 4 as shown in FIG. 11 from the state in which the escape portion 4b of the holder 4 is located on the outer periphery of the lock member 3 as shown in FIG. The restricting portion 4a of the holder 4 is positioned on the outer periphery of the stopper member 3, the radial movement of the sleeve 2 of the locking member 3 is restricted, and the locking member 3 protrudes into the sleeve 2, as shown in FIG. In the sleeve 2, the locking member 3 and the small diameter portion 1a of the tip tool 1 are engaged, and the tip tool 1 is attached to the sleeve 2.
[0056]
As described above, according to the tool holding device for an impact tool of the present invention, a pin which is a moving member that is held by the sleeve 2 so as to be movable in the radial direction of the sleeve 2 only by inserting the tip tool 1 into the sleeve 2. 6 is moved outward in the radial direction of the sleeve 2 by the axial movement of the tip tool 1 in the sleeve 2, and the rotation member 7 is moved in the axial direction by the movement of the pin 6 to form a rotation restricting means. The contact in the rotational direction between the portion 7e and the first stepped portion 2e is released, the rotational member 7 is rotated to one rotational position, and the radial movement of the sleeve 2 of the locking member 3 is restricted. In order to operate the holder 4, the tip tool 1 can be held on the sleeve 2. Therefore, the attachment work of the tip tool 1 can be easily performed.
[0057]
In order to remove the tip tool 1 from the state in which the tip tool 1 is attached to the sleeve 2 as shown in FIG. 10, the grip 5 is against the urging force of the torsion spring 10 against the sleeve 2. This is done by turning it clockwise.
[0058]
When the grip 5 is rotated counterclockwise as shown in FIG. 12, the rotating member 7 and the holder 4 are rotated together with the grip 5, and when the grip member 5 is rotated about 60 ° from the state of FIG. Due to the urging force of the compression spring 11 provided between the holder 4 and the rotating member 7, the protrusion 7e at the end of the rotating member 7 opposite to the holder 4 falls from the first stepped portion 2e, and the protruding portion 7e The rotating member 7 is in contact with the first stepped portion 2e in the rotating direction, and the rotating member 7 is restricted from rotating while resisting the urging force of the torsion spring 10, and the states shown in FIGS. Become.
[0059]
When the grip 5 is turned about 60 ° counterclockwise from the state shown in FIG. 12, the holder 4 is also turned about 60 ° from the state shown in FIG. From the state in which the restricting portion 4a of the holder 4 is positioned on the outer periphery of the holder 3, the escape portion 4b of the holder 4 is positioned on the outer periphery of the locking member 3, and the radial movement of the sleeve 2 of the locking member 3 is allowed. Thus, the tip tool 1 can be removed from the sleeve 2. When the grip 5 is rotated 60 ° or more in the counterclockwise direction from the state shown in FIG. 12, the protrusion 7e of the rotating member 7 falls into the first step portion 2e, and then the grip 5 is rotated. When released, the rotating member 7 and the grip 5 are rotated by the biasing force of the torsion spring 10, and the projecting portion 7e of the rotating member 7 contacts the first step portion 2e, whereby the rotating position of the rotating member 7 is reached. Therefore, the work of removing the tip tool 1 from the sleeve 2 by rotating the grip 5 can be easily performed.
[0060]
In the above embodiment, as can be seen from FIG. 9 and FIG. 12, the rotation amount by which the rotation member 7 and the grip 5 are rotated is set to about 60 °. However, as shown in FIG. This is because the holder 4 is provided with three relief portions 4b, and the locking member 3 is positioned substantially at the center of the restriction portion 4a between the relief portions 4b. Even if the holder 4 is slightly rotated, the movement of the locking member 3 in the radial direction of the sleeve 2 can be surely restricted.
[0061]
In addition, as shown to a figure, in the said embodiment, although the locking member 3 and the pin 6 were steel balls, the structure of this invention is not restricted to this. The locking member 3 can be configured as shown in FIGS. 15 and 16, and the holder 4 can be similarly configured as shown in FIGS.
[0062]
As described above, according to the present invention, the pin 6, which is a moving member that is movable in the radial direction of the sleeve 2 and moves outward in the radial direction of the sleeve 2 by the axial movement of the tip tool 1 in the sleeve 2, is provided. 2 and a rotating member 7 constituting an operating means for operating the holder 4 so as to restrict the movement of the locking member 3 by the movement of the pin 6 which is a moving member. The tip tool 1 can be held on the sleeve 2 simply by inserting the tip tool 1 into the sleeve 2, and the tip tool 1 can be easily attached.
[0063]
In the embodiment shown in FIGS. 1 to 6, when the tip tool 1 is inserted into the sleeve 2 and the pin 6 moves outward in the radial direction of the sleeve 2, the rotating member 7 rotates to rotate the rotating member. 7 moves the holder 4 in the axial direction of the sleeve 2, thereby restricting the radial movement of the sleeve 2 of the locking member 3 and holding the tip tool 1 on the sleeve 2. As shown in the embodiment shown in FIG. 13, the holder 4 and the rotating member 7 are rotated while being changed to a configuration that can rotate with respect to the sleeve 2 and restrict or permit the movement of the locking member 3 depending on the rotating position. It is also possible to adopt a configuration in which the engagement is impossible.
[0064]
【The invention's effect】
As described above, according to the present invention, the sleeve is provided with the moving member that is movable in the radial direction of the sleeve and moves outward in the radial direction of the sleeve by the axial movement of the tip tool in the sleeve. By providing the operation means for operating the holder so as to restrict the radial movement of the sleeve of the locking member by the movement, the operation of attaching the tip tool to the sleeve is performed only by inserting the tip tool into the sleeve. Therefore, it is possible to provide a tool holding device for an impact tool that can improve workability.
[Brief description of the drawings]
FIG. 1 is a longitudinal side view showing an embodiment of a tool holding device for an impact tool of the present invention.
FIG. 2 is a cross-sectional view taken along line AA in FIG.
FIG. 3 is an operation explanatory view of the tool holding device of the impact tool in FIG. 1 showing a state in which the tip tool is held.
4 is a cross-sectional view taken along line BB in FIG.
5 is a perspective view showing the rotating member of FIG. 1 constituting a tool holding device for an impact tool of the present invention.
6 is a perspective view showing the holder of FIG. 1 constituting the tool holding device for an impact tool of the present invention.
FIG. 7 is a longitudinal side view showing another embodiment of the tool holding device for an impact tool of the present invention.
8 is a cross-sectional view taken along line CC in FIG.
9 is a cross-sectional view taken along line DD of FIG.
10 is an operation explanatory view of the tool holding device of the impact tool of FIG. 7 showing a state in which the tip tool is held.
11 is a cross-sectional view taken along line EE in FIG.
12 is a sectional view taken along line FF in FIG.
13 is a perspective view showing the sleeve of FIG. 7 constituting the tool holding device of the impact tool of the present invention.
FIG. 14 is a longitudinal side view showing an example of a conventional tool holding device for an impact tool.
FIG. 15 is a longitudinal side view showing another example of a conventional tool holding device for an impact tool.
16 is a cross-sectional view taken along line GG in FIG.
[Explanation of symbols]
1 is a tip tool, 1a is a small diameter portion, 1b is a stepped portion, 2 is a sleeve, 2a is a locking hole, 2b is a tip, 2c is a circular hole, 2d is a hole groove, 2e is a stepped portion, and 3 is a locking member. 4 is a holder, 4a is a restricting portion, 4b is a relief portion, 4c is a convex portion, 4d is a protruding portion, 5 is a grip, 5a is a convex portion, 6 is a moving member, 7 is a rotating member, 7a is a through hole, 7b is a hole groove, 7c is a convex part, 7d is a convex part, 7e is a convex part, 7f is an inner diameter part, 7g is a relief part, 7h is an inclined surface, 7i is a concave part, 8 is a locking pin, 9 is a ring spring 10 is a torsion spring, 10a and 10b are end portions, 11 is a compression spring, 12 is a damper, 13 is a washer, 14 is a C-shaped ring, and 15 is a cap.

Claims

A sleeve having a small diameter portion capable of storing a tip tool, a locking member held by the sleeve so as to be movable in a radial direction of the sleeve, and provided on an outer periphery of the sleeve; An impact tool having a holder for restricting the movement and allowing the locking member to protrude into the sleeve and permitting the movement of the locking member in another operating position;
A movable member that is movable in the radial direction of the sleeve and moves radially outward of the sleeve by insertion of the tip tool into the sleeve is provided on the sleeve, and is provided rotatably on the outer periphery of the sleeve. A rotation member urged to rotate in one rotation direction by the urging means, and restricting the rotation of the rotation member relative to the sleeve in a state against the urging force of the urging means; A rotation restricting means for releasing the rotation restriction of the turning member by the movement of the member, and the turning member operates the holder so that the locking member protrudes into the sleeve by turning;
The impact tool characterized in that the rotating member is provided so as not to rotate relative to the holder.

It said biasing means, the impact tool according to claim 1, wherein the one end engages the sleeve, a torsion spring other end is engaged with the rotary member.

The turning member is provided so as to be movable in the axial direction of the sleeve by the movement of the moving member outward in the radial direction of the sleeve, and the turning restricting means includes a step portion provided on an outer periphery of the sleeve and the step The impact tool according to claim 1, further comprising a protrusion provided on the rotating member capable of contacting in the rotating direction of the rotating member.

The impact tool according to claim 3, further comprising an urging unit that urges the rotating member toward the stepped portion between the rotating member and the holder.

A sleeve having a small diameter portion capable of storing a tip tool, a locking member held by the sleeve so as to be movable in a radial direction of the sleeve, and provided on an outer periphery of the sleeve; A tool holding device for an impact tool having a holder for restricting the movement and allowing the locking member to protrude into the sleeve and permitting the movement of the locking member in another operating position;
A movable member that is movable in the radial direction of the sleeve and moves radially outward of the sleeve by insertion of the tip tool into the sleeve is provided on the sleeve, and is provided rotatably on the outer periphery of the sleeve. A rotation member urged to rotate in one rotation direction by the urging means, and restricting the rotation of the rotation member relative to the sleeve in a state against the urging force of the urging means; A rotation restricting means for releasing the rotation restriction of the turning member by the movement of the member, and the turning member operates the holder so that the locking member protrudes into the sleeve by turning;
A tool holding device for an impact tool, wherein the rotating member is provided so as not to rotate relative to the holder.

6. The tool holding device for an impact tool according to claim 5, wherein the biasing means is a torsion spring having one end engaged with the sleeve and the other end engaged with the rotating member.

The turning member is provided so as to be movable in the axial direction of the sleeve by the movement of the moving member outward in the radial direction of the sleeve, and the turning restricting means includes a step portion provided on an outer periphery of the sleeve and the step 6. The tool holding device for an impact tool according to claim 5, further comprising a protrusion provided on the rotating member capable of contacting in the rotating direction of the rotating member.

The tool holding device for an impact tool according to claim 7, further comprising an urging unit that urges the rotating member toward the stepped portion between the rotating member and the holder.