JP2019150942A

JP2019150942A - Impact tool

Info

Publication number: JP2019150942A
Application number: JP2018121100A
Authority: JP
Inventors: 耕司高萩; Koji Takahagi; 嵩登田渕; Takato Tabuchi; 貴大楠本; Takahiro Kusumoto; 徳夫平林; Tokuo Hirabayashi
Original assignee: Makita Corp
Current assignee: Makita Corp
Priority date: 2018-03-05
Filing date: 2018-06-26
Publication date: 2019-09-12
Anticipated expiration: 2038-06-26
Also published as: JP7049944B2; CN209425376U

Abstract

To prevent separation of a distal end of an anvil even if the anvil is broken.SOLUTION: An impact wrench 1 includes a brushless motor 12, a hammer 37 which is rotated by the brushless motor 12, and a shaft-like anvil 4 which is impacted by the hammer 37 in a rotation direction. The anvil 4 has a proximal end part 46 having a cylindrical outer shape, and a distal end part 47 continuous with the proximal end part 46 and having a prism-like outer shape, and further has an axial center hole 53 which is formed in an axial direction of the anvil 4 in a manner extending over the proximal end part 46 and the distal end 47. A pin 55 is inserted in the axial center hole 53.SELECTED DRAWING: Figure 4

Description

本発明は、インパクトレンチやインパクトドライバ等のインパクト工具に関する。 The present invention relates to impact tools such as impact wrench and impact driver.

インパクトレンチ等のインパクト工具は、モータと、モータの駆動に伴って回転するスピンドルと、スピンドルにカム結合されるハンマを含む打撃機構とを備え、打撃機構をハンマケースに収容して、ハンマを、ハンマケースの前端で軸支されるアンビルに係合させてなるものが知られている（例えば特許文献１参照）。ここではアンビルのトルクが増加すると、スピンドルの回転をハンマの間欠的な回転打撃力（インパクト）に変換してアンビルに付与でき、アンビルに装着したソケットやビット等でボルトやネジの締め外しが行えるようになっている。 An impact tool such as an impact wrench includes a motor, a spindle that rotates as the motor is driven, and an impact mechanism that includes a hammer that is cam-coupled to the spindle. The impact mechanism is housed in a hammer case, There is known one engaged with an anvil pivotally supported at the front end of the hammer case (see, for example, Patent Document 1). Here, when the torque of the anvil increases, the rotation of the spindle can be applied to the anvil by converting it to intermittent hammering force (impact) of the hammer, and the bolts and screws can be tightened with a socket or bit attached to the anvil. It is like that.

特開２０１８−１３１４号公報JP-A-2018-1314

このようなインパクト工具において、例えばアンビルに装着したソケットによってボルトやナットの締め付けを行う際、ねじれ方向に大きなトルクが加わると、アンビルが折損して先端がソケットごと分離してしまうおそれがあった。 In such an impact tool, for example, when a bolt or nut is tightened with a socket attached to the anvil, if a large torque is applied in the twisting direction, the anvil may break and the tip may be separated from the socket.

そこで、本発明は、アンビルが折損することがあっても、先端が分離することがないインパクト工具を提供することを目的としたものである。 SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an impact tool in which a tip does not separate even if an anvil breaks.

上記目的を達成するために、請求項１に記載の発明は、モータと、モータにより回転するハンマと、ハンマにより回転方向に打撃される軸状のアンビルと、を含んでなり、アンビルは、外形円筒状の基端部と、基端部と連続する外形角筒状の先端部とを有すると共に、基端部と先端部とに跨がってアンビル内で軸線方向に形成される孔を有し、孔に、ピンが挿入されていることを特徴とする。
請求項２に記載の発明は、請求項１の構成において、孔は、アンビルの軸心に形成されていることを特徴とする。
請求項３に記載の発明は、請求項１の構成において、先端部には、装着したソケットの抜け止めに用いる貫通孔が、アンビルの軸線方向と直交方向に形成され、孔は、貫通孔を挟んでアンビルの軸心を中心とした点対称位置に一対設けられて、各孔にピンがそれぞれ挿入されていることを特徴とする。
請求項４に記載の発明は、請求項１乃至３の何れかの構成において、ピンは、アンビルよりも強度の高い材料で形成されていることを特徴とする。
請求項５に記載の発明は、請求項１乃至４の何れかの構成において、基端部側で孔とピンとの間には、ピンの抜け止め手段が設けられていることを特徴とする。
請求項６に記載の発明は、請求項５の構成において、抜け止め手段は、ピンに外装されて孔の内面を押圧する弾性体であることを特徴とする。
請求項７に記載の発明は、請求項５の構成において、抜け止め手段は、孔に対するピンの少なくとも一部の圧入であることを特徴とする。
請求項８に記載の発明は、請求項５乃至７の何れかの構成において、ピンに、先端部の端面に係合する係合部が設けられていることを特徴とする。
上記目的を達成するために、請求項９に記載の発明は、モータと、モータにより回転するハンマと、ハンマにより回転方向に打撃される軸状のアンビルと、を含むインパクト工具であって、アンビルが折損した際にアンビルを工具本体から分離不能とする分離防止手段が備えられていることを特徴とする。
上記目的を達成するために、請求項１０に記載の発明は、モータと、モータにより回転するハンマと、ハンマにより回転方向に打撃される軸状のアンビルと、を含んでなり、アンビルは、外形円筒状の基端部と、基端部と連続する外形角筒状の先端部とを有すると共に、基端部と先端部とに跨がってアンビル内で軸線方向に形成される孔を有し、孔の内部に、基端部と先端部とに跨がって軸線方向に延びる連結部材が設けられていると共に、連結部材における基端部側の端部と先端部側の端部とに、孔の直径よりも大きい拡径部がそれぞれ一体的に設けられていることを特徴とする。
請求項１１に記載の発明は、請求項１０の構成において、先端部には、装着したソケットの抜け止めに用いる貫通孔が、アンビルの軸線方向と直交方向に形成され、先端部側に設けられる拡径部は、貫通孔内で同軸のリング状に形成されて、貫通孔の内径とリング状の拡径部の内径とは同径となっていることを特徴とする。なお、ここでの「同径」は多少の誤差も含む。
請求項１２に記載の発明は、請求項１１の構成において、ソケットの抜け止めのために貫通孔に挿通される抜け止めピンは、リング状の拡径部を貫通することを特徴とする。
請求項１３に記載の発明は、請求項１１又は１２の構成において、連結部材はワイヤであり、リング状の拡径部は、ワイヤの端部が係止するＯリングであることを特徴とする。
請求項１４に記載の発明は、請求項１１又は１２の構成において、連結部材はワイヤであり、リング状の拡径部は、ワイヤの端部を折り曲げて形成されることを特徴とする。
請求項１５に記載の発明は、請求項１０乃至１４の何れかの構成において、基端部には、孔と同軸で連通する有底孔が形成され、基端部側に設けられる拡径部は、有底孔内で連結部材に連結されるスチールボールであることを特徴とする。 In order to achieve the above object, an invention according to claim 1 includes a motor, a hammer rotated by the motor, and a shaft-shaped anvil struck in the rotation direction by the hammer. It has a cylindrical base end and an outer rectangular tube-shaped front end continuous with the base end, and has a hole formed in the anvil direction in the anvil across the base end and the front end. And a pin is inserted into the hole.
According to a second aspect of the present invention, in the configuration of the first aspect, the hole is formed in the axial center of the anvil.
According to a third aspect of the present invention, in the configuration of the first aspect, a through hole used for retaining the attached socket is formed in the tip portion in a direction perpendicular to the axial direction of the anvil. A pair of pins are provided at point-symmetrical positions around the axis of the anvil, and pins are inserted into the holes, respectively.
According to a fourth aspect of the present invention, in any one of the first to third aspects, the pin is formed of a material having higher strength than the anvil.
According to a fifth aspect of the present invention, in any one of the first to fourth aspects, a pin retaining means is provided between the hole and the pin on the base end side.
According to a sixth aspect of the present invention, in the configuration of the fifth aspect, the retaining means is an elastic body that is externally mounted on the pin and presses the inner surface of the hole.
According to a seventh aspect of the present invention, in the configuration of the fifth aspect, the retaining means is a press-fit of at least a part of the pin into the hole.
According to an eighth aspect of the present invention, in the structure according to any of the fifth to seventh aspects, the pin is provided with an engaging portion that engages with an end surface of the tip portion.
In order to achieve the above object, an invention according to claim 9 is an impact tool including a motor, a hammer rotated by the motor, and a shaft-shaped anvil struck in the rotation direction by the hammer. Separation preventing means for making the anvil unseparable from the tool main body when it breaks is provided.
In order to achieve the above object, an invention according to claim 10 includes a motor, a hammer rotated by the motor, and a shaft-shaped anvil that is struck in the rotation direction by the hammer. It has a cylindrical base end and an outer rectangular tube-shaped front end continuous with the base end, and has a hole formed in the anvil direction in the anvil across the base end and the front end. A connecting member extending in the axial direction across the base end portion and the tip end portion is provided inside the hole, and an end portion on the base end portion side and an end portion on the tip end side of the connecting member are provided. In addition, a larger-diameter portion larger than the diameter of the hole is integrally provided.
According to an eleventh aspect of the present invention, in the configuration of the tenth aspect, a through hole used for retaining the attached socket is formed in the distal end portion in a direction orthogonal to the axial direction of the anvil and provided on the distal end portion side. The enlarged diameter portion is formed in a coaxial ring shape in the through hole, and the inner diameter of the through hole and the inner diameter of the ring-shaped enlarged diameter portion are the same. The “same diameter” here includes some errors.
According to a twelfth aspect of the present invention, in the structure of the eleventh aspect, the retaining pin inserted through the through hole for retaining the socket penetrates the ring-shaped enlarged diameter portion.
According to a thirteenth aspect of the present invention, in the configuration of the eleventh or twelfth aspect, the connecting member is a wire, and the ring-shaped enlarged diameter portion is an O-ring that the end of the wire is locked. .
A fourteenth aspect of the invention is characterized in that, in the constitution of the eleventh or twelfth aspect, the connecting member is a wire, and the ring-shaped enlarged diameter portion is formed by bending an end portion of the wire.
According to a fifteenth aspect of the present invention, in the structure according to any one of the tenth to fourteenth aspects, the base end portion is formed with a bottomed hole that communicates coaxially with the hole and is provided on the base end portion side. Is a steel ball connected to the connecting member in the bottomed hole.

本発明によれば、アンビルが折損することがあっても、ピンや分離防止手段、連結部材の存在により、先端部が分離することがない。よって、ソケットの工具本体からの分離を防止することができる。 According to the present invention, even if the anvil breaks, the tip portion is not separated due to the presence of the pin, the separation preventing means, and the connecting member. Therefore, separation of the socket from the tool body can be prevented.

インパクトレンチの斜視図である。It is a perspective view of an impact wrench. インパクトレンチの正面図である。It is a front view of an impact wrench. インパクトレンチの中央縦断面図である。It is a center longitudinal cross-sectional view of an impact wrench. 本体部の拡大図である。It is an enlarged view of a main-body part. ソケットを装着したアンビルの説明図で、（Ａ）は側面、（Ｂ）は正面、（Ｃ）はＡ−Ａ線断面、（Ｄ）はアンビルが折損した状態の断面、（Ｅ）はピンを長くした変更例の断面をそれぞれ示す。It is explanatory drawing of the anvil which attached the socket, (A) is the side, (B) is the front, (C) is the AA line section, (D) is the section where the anvil is broken, (E) is the pin The cross sections of the modified examples are shown respectively. ピンの先端のみを圧入したアンビルの変更例の説明図で、（Ａ）は縦断面、（Ｂ）はアンビルが折損した状態の断面をそれぞれ示す。It is explanatory drawing of the example of a change of the anvil which press-fitted only the front-end | tip of a pin, (A) is a longitudinal cross-section, (B) shows the cross section in the state where the anvil broke down, respectively. ピン全体を圧入したアンビルの変更例の説明図で、（Ａ）は縦断面、（Ｂ）はアンビルが折損した状態の断面をそれぞれ示す。It is explanatory drawing of the example of a change of the anvil which press-fit the whole pin, (A) is a longitudinal cross-section, (B) shows the cross section in the state where the anvil broke down, respectively. 有底孔を有するアンビルにソケットを装着した変更例の説明図で、（Ａ）は側面、（Ｂ）はＢ−Ｂ線断面、（Ｃ）はアンビルが折損した状態の断面をそれぞれ示す。It is explanatory drawing of the example of a change which attached the socket to the anvil which has a bottomed hole, (A) is a side surface, (B) is a BB line cross section, (C) shows the cross section in the state where the anvil was broken, respectively. 有底孔を有するアンビルにピンの先端のみを圧入した変更例の説明図で、（Ａ）は縦断面、（Ｂ）はアンビルが折損した状態の断面をそれぞれ示す。It is explanatory drawing of the modification which press-fits only the front-end | tip of a pin in the anvil which has a bottomed hole, (A) is a longitudinal cross-section, (B) shows the cross section in the state where the anvil broke down, respectively. 有底孔を有するアンビルにピン全体を圧入した変更例の説明図で、（Ａ）は縦断面、（Ｂ）はアンビルが折損した状態の断面をそれぞれ示す。It is explanatory drawing of the modification which press-fits the whole pin to the anvil which has a bottomed hole, (A) is a longitudinal cross-section, (B) shows the cross section of the state which the anvil broke, respectively. ピンを２本設けた変更例のアンビルを有するインパクトレンチの一部正面図である。It is a partial front view of the impact wrench which has the anvil of the modification which provided two pins. ピンを２本設けた変更例のアンビルを有するインパクトレンチの本体部の拡大図である。It is an enlarged view of the main-body part of the impact wrench which has the anvil of the modification which provided two pins. ピンを２本設けた変更例のアンビルにソケットを装着した説明図で、（Ａ）は側面、（Ｂ）は正面、（Ｃ）はＣ−Ｃ線断面、（Ｄ）はアンビルが折損した状態の断面をそれぞれ示す。It is explanatory drawing which attached the socket to the anvil of the modified example which provided two pins, (A) is a side surface, (B) is a front, (C) is a CC cross section, (D) is the state where the anvil broke down Each of the cross sections is shown. ２本のピンの先端のみを圧入したアンビルの変更例の説明図で、（Ａ）は縦断面、（Ｂ）はアンビルが折損した状態の断面をそれぞれ示す。It is explanatory drawing of the example of a change of the anvil which press-fitted only the front-end | tip of two pins, (A) is a longitudinal cross-section, (B) shows the cross section of the state which the anvil broke, respectively. ２本のピンを遊挿したアンビルの変更例の説明図で、（Ａ）は縦断面、（Ｂ）はアンビルが折損した状態の断面をそれぞれ示す。It is explanatory drawing of the example of a change of the anvil which loosely inserted two pins, (A) is a longitudinal cross-section, (B) shows the cross section in the state where the anvil broke down, respectively. ワイヤを用いたアンビルの変更例の説明図で、（Ａ）は縦断面、（Ｂ）はＤ−Ｄ線断面、（Ｃ）はＥ−Ｅ線断面をそれぞれ示す。It is explanatory drawing of the example of a change of the anvil using a wire, (A) is a longitudinal cross-section, (B) shows a DD line cross section, (C) shows an EE line cross section, respectively. 図１６のＡ部拡大図である。It is the A section enlarged view of FIG. ワイヤを用いた変更例のアンビルにソケットを装着した説明図で、（Ａ）は縦断面、（Ｂ）はＦ−Ｆ線断面、（Ｃ）はＧ−Ｇ線断面をそれぞれ示す。It is explanatory drawing which attached the socket to the anvil of the example of a change using a wire, (A) is a longitudinal cross-section, (B) is a FF line cross section, (C) shows a GG line cross section, respectively. 図１８のＢ部拡大図である。It is the B section enlarged view of FIG. ワイヤを用いたアンビルの他の変更例の説明図で、（Ａ）は縦断面、（Ｂ）はＨ−Ｈ線断面、（Ｃ）はＩ−Ｉ線断面をそれぞれ示す。It is explanatory drawing of the other modification of the anvil using a wire, (A) is a longitudinal cross-section, (B) shows a HH line cross section, (C) shows an II line cross section, respectively. 図２０のＣ部拡大図である。It is the C section enlarged view of FIG.

以下、本発明の実施の形態を図面に基づいて説明する。
図１は、インパクト工具の一例であるインパクトレンチの斜視図、図２は正面図、図３は中央縦断面図である。このインパクトレンチ１は、前後方向に延びる本体部２に、ハンドル３を下向きに形成した側面視Ｔ字状の工具本体を有し、本体部２の先端からはアンビル４が前方へ突出している。ハンドル３の下端に設けたバッテリー装着部５には、電源となる複数の充電池を収容したバッテリーパック６が装着されている。
本体部２のハウジングは、下部にハンドル３を延設した合成樹脂製の本体ハウジング７と、本体ハウジング７の前方に組み付けられて打撃機構１４を収容する金属製のハンマケース８とからなる。本体ハウジング７は、左右一対の半割ハウジング７ａ，７ｂを左右方向のネジ９，９・・によって組み付けて形成される。本体ハウジング７内でハンマケース８の後方には、ハンマケース８の後端を閉塞するギヤハウジング１０が、各半割ハウジング７ａ，７ｂの内面に突設された保持リブ１１によって保持されている。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of an impact wrench as an example of an impact tool, FIG. 2 is a front view, and FIG. 3 is a central longitudinal sectional view. This impact wrench 1 has a tool body having a T-shape in a side view in which a handle 3 is formed downward on a main body 2 extending in the front-rear direction, and an anvil 4 projects forward from the tip of the main body 2. A battery pack 6 containing a plurality of rechargeable batteries serving as a power source is attached to the battery attachment portion 5 provided at the lower end of the handle 3.
The housing of the main body 2 is composed of a synthetic resin main body housing 7 with a handle 3 extended in the lower part, and a metal hammer case 8 that is assembled in front of the main body housing 7 and accommodates the striking mechanism 14. The main body housing 7 is formed by assembling a pair of left and right halved housings 7a, 7b with screws 9, 9,. A gear housing 10 that closes the rear end of the hammer case 8 is held behind the hammer case 8 in the main body housing 7 by holding ribs 11 protruding from the inner surfaces of the half housings 7a and 7b.

本体部２には、図４にも示すように、後方から、ブラシレスモータ１２、スピンドル１３、打撃機構１４、アンビル４が順番に配置されて、ブラシレスモータ１２が本体ハウジング７に収容され、スピンドル１３と打撃機構１４とアンビル４とがハンマケース８に収容されている。
まず、ブラシレスモータ１２は、ステータ１５とその内側のロータ１６とからなるインナロータ型で、ステータ１５は、複数の積層鋼板から形成される筒状の固定子鉄心１７と、固定子鉄心１７の軸方向前後の端面にそれぞれ設けられる前絶縁部材１８及び後絶縁部材１９と、前後絶縁部材１８，１９を介して固定子鉄心１７に巻回されるコイル２０，２０・・と、を有する。前絶縁部材１８には、ロータ１６に設けた永久磁石２４の位置を検出して回転検出信号を出力する回転検出素子（図示略）を搭載したセンサ回路基板２１が取り付けられている。 As shown in FIG. 4, the brushless motor 12, the spindle 13, the striking mechanism 14, and the anvil 4 are sequentially arranged in the main body 2 from the rear, and the brushless motor 12 is accommodated in the main body housing 7. The hammering mechanism 14 and the anvil 4 are accommodated in the hammer case 8.
First, the brushless motor 12 is an inner rotor type including a stator 15 and a rotor 16 inside thereof, and the stator 15 includes a cylindrical stator core 17 formed of a plurality of laminated steel plates and an axial direction of the stator core 17. And a front insulating member 18 and a rear insulating member 19 provided on the front and rear end surfaces, respectively, and coils 20, 20,... Wound around the stator core 17 via the front and rear insulating members 18, 19. A sensor circuit board 21 on which a rotation detection element (not shown) that detects the position of the permanent magnet 24 provided on the rotor 16 and outputs a rotation detection signal is mounted on the front insulating member 18.

ロータ１６は、軸心に位置する回転軸２２と、回転軸２２の周囲に配置され、複数の鋼板を積層してなる略円筒状の回転子鉄心２３と、回転子鉄心２３の内部に固定される板状の永久磁石２４，２４・・とを有する。回転軸２２の後端は、本体ハウジング７の後部に保持された軸受２５に軸支され、前端は、ギヤハウジング１０に保持された軸受２６に軸支されて、ピニオン２７が形成された前端をギヤハウジング１０の前方へ突出している。回転軸２２における軸受２５の前方部位には、遠心ファン２８が取り付けられて、遠心ファン２８の外側で本体ハウジング７の左右の側面には、周方向に並ぶ複数の排気口２９，２９・・が形成され、センサ回路基板２１の外側で本体ハウジング７の左右の側面には、前後方向に並ぶ複数の吸気口３０，３０・・が形成されている。 The rotor 16 is fixed around the rotating shaft 22 positioned at the shaft center, the substantially cylindrical rotor core 23 which is disposed around the rotating shaft 22 and is formed by stacking a plurality of steel plates, and the rotor core 23. Plate-like permanent magnets 24, 24,. The rear end of the rotary shaft 22 is pivotally supported by a bearing 25 held at the rear portion of the main body housing 7, and the front end is pivotally supported by a bearing 26 held by the gear housing 10, and the front end where the pinion 27 is formed is formed. Projecting forward of the gear housing 10. A centrifugal fan 28 is attached to a front portion of the bearing 25 on the rotary shaft 22, and a plurality of exhaust ports 29, 29... Arranged in the circumferential direction are provided on the left and right side surfaces of the main body housing 7 outside the centrifugal fan 28. A plurality of air inlets 30, 30... Arranged in the front-rear direction are formed on the left and right side surfaces of the main body housing 7 outside the sensor circuit board 21.

スピンドル１３は、後部に遊星歯車３２，３２・・を保持するキャリア部３１を一体に有し、後端軸心には有底孔３３が形成されて、有底孔３３内に突出した回転軸２２のピニオン２７が遊星歯車３２に噛合している。ハンマケース８の後端内面とギヤハウジング１０との間には、遊星歯車３２が噛合するインターナルギヤ３４が保持されている。ハンマケース８内でスピンドル１３の後端は、ギヤハウジング１０に保持される軸受３５によって軸支されている。スピンドル１３の前端軸心には凹部３６が形成されている。
打撃機構１４は、スピンドル１３の前部に外装されたハンマ３７と、そのハンマ３７を前方へ付勢するコイルバネ３８とを含んで構成される。ハンマ３７は、前面に図示しない一対の爪を備え、内周面に設けた外側カム溝３９と、スピンドル１３の外周面に設けた内側カム溝４０とに跨がって嵌合するボール４１，４１を介してスピンドル１３と回転方向で係合している。コイルバネ３８は、スピンドル１３に外装されて前端をハンマ３７の後面に設けたリング溝４２に挿入させる一方、後端をキャリア部３１の前面に当接させて、常態ではハンマ３７を前進位置に付勢している。 The spindle 13 integrally has a carrier portion 31 for holding the planetary gears 32, 32.. At the rear portion, and a bottomed hole 33 is formed at the rear end axis, and the rotating shaft protruding into the bottomed hole 33 is formed. 22 pinions 27 mesh with the planetary gear 32. An internal gear 34 with which the planetary gear 32 meshes is held between the rear end inner surface of the hammer case 8 and the gear housing 10. In the hammer case 8, the rear end of the spindle 13 is pivotally supported by a bearing 35 held by the gear housing 10. A recess 36 is formed in the front end axis of the spindle 13.
The striking mechanism 14 includes a hammer 37 that is externally mounted on the front portion of the spindle 13 and a coil spring 38 that biases the hammer 37 forward. The hammer 37 includes a pair of claws (not shown) on the front surface, and a ball 41 that fits across an outer cam groove 39 provided on the inner peripheral surface and an inner cam groove 40 provided on the outer peripheral surface of the spindle 13. 41 is engaged with the spindle 13 through the rotation direction. The coil spring 38 is externally mounted on the spindle 13 so that the front end is inserted into a ring groove 42 provided on the rear surface of the hammer 37, while the rear end is brought into contact with the front surface of the carrier portion 31 so that the hammer 37 is normally attached to the forward position. It is fast.

ハンマケース８は、前方へ先細りとなるテーパ筒状で、前端には内面が等径となる小径の軸受部４３が形成されて、軸受部４３の前端にバンパ４４が外装されている。
アンビル４は鉄製の軸状で、軸受部４３に軸受メタル４５によってスピンドル１３と同軸で軸支される外形円筒状の基端部４６と、基端部４６に同軸で連続して前方へ突出し、外周四面を面取して後述するソケット６０を装着する外形角筒状（ここでは正方形筒状）の先端部４７とを有する。基端部４６の後端には、ハンマ３７の爪と回転方向で係合する一対のアーム４８，４８が形成されると共に、後端軸心には、スピンドル１３の凹部３６に嵌合する凸部４９が形成されている。軸受メタル４５は、軸受部４３の後端内面より後方へ突出して保持されており、その後端には、アーム４８，４８の前側を受けるワッシャ５０が外装されている。 The hammer case 8 has a tapered cylindrical shape that tapers forward, a small-diameter bearing portion 43 having an inner diameter of the inner diameter is formed at the front end, and a bumper 44 is externally provided at the front end of the bearing portion 43.
The anvil 4 has an iron shaft shape, and has an outer cylindrical base end portion 46 coaxially supported on the bearing portion 43 by a bearing metal 45 and coaxially with the spindle 13, and continuously protrudes forward on the base end portion 46 coaxially. The outer peripheral square surface is chamfered, and has a rectangular tube-shaped (herein, a square tube-shaped) tip portion 47 on which a socket 60 described later is mounted. At the rear end of the base end portion 46, a pair of arms 48, 48 that engage with the claws of the hammer 37 in the rotational direction are formed, and at the rear end axial center, a protrusion that fits into the recess 36 of the spindle 13 is formed. A portion 49 is formed. The bearing metal 45 protrudes rearward from the inner surface of the rear end of the bearing portion 43, and a washer 50 for receiving the front sides of the arms 48, 48 is provided on the rear end.

また、先端部４７の前端外周には、図５にも示すように、リング溝５１が形成されて、リング溝５１に、ソケット６０の内面に押圧して抜け抵抗を付与するバネリング５２が外装されている。
さらに、アンビル４の軸心には、先端部４７の前面から先端部４７を越えて後方へ延びる本発明の孔としての横断面円形の軸心孔５３が、前面側の開口部５４を大径として形成されており、この軸心孔５３に、開口部５４に嵌合する係合部としての大径の頭部５６を有する分離防止手段としての横断面円形のピン５５が、略全長に亘って遊挿されている。ピン５５の後端部には、抜け止め手段（弾性体）としてのリングスプリング５７が外装されて、リングスプリング５７が軸心孔５３の内面と当接することにより、ピン５５の抜けを防止している。このピン５５は、アンビル４と同じ鉄製である。 Further, as shown in FIG. 5, a ring groove 51 is formed on the outer periphery of the front end of the tip portion 47, and a spring ring 52 that presses against the inner surface of the socket 60 and provides resistance to pulling out is attached to the ring groove 51. ing.
Further, a shaft center hole 53 having a circular cross section as a hole of the present invention extending rearward from the front surface of the tip portion 47 beyond the tip portion 47 is formed in the shaft center of the anvil 4 so that the opening 54 on the front side has a large diameter. A pin 55 having a circular cross section as a separation preventing means having a large-diameter head portion 56 as an engaging portion that fits into the opening portion 54 is formed in the axial hole 53 over substantially the entire length. Are loosely inserted. A ring spring 57 as a retaining means (elastic body) is externally provided at the rear end portion of the pin 55, and the ring spring 57 is in contact with the inner surface of the axial hole 53 to prevent the pin 55 from coming off. Yes. This pin 55 is made of the same iron as the anvil 4.

先端部４７に装着されるソケット６０は、六角ボルト等の頭部が嵌合可能な正面視正六角形の六角孔６２を開口させた大径部６１と、大径部６１と同軸で連結されて先端部４７に嵌合する正面視正方形状の四角孔６４を形成した小径部６３とからなる筒状となっている。小径部６３には、図示しないＯリングが外装される凹溝６５が形成され、凹溝６５の位置には、小径部６３の軸線と直交する直交孔６６が貫通形成されている。先端部４７に装着した状態での軸心孔５３及びピン５５の後端は、アンビル４のアーム４８の前面よりも前方で、ソケット６０の後端よりも後方に位置している。 A socket 60 attached to the distal end portion 47 is coaxially connected to the large diameter portion 61 and a large diameter portion 61 in which a hexagonal hole 62 having a regular hexagonal shape in front view that can be fitted with a head such as a hexagon bolt is opened. It has a cylindrical shape including a small-diameter portion 63 formed with a square hole 64 having a square shape when viewed from the front to be fitted to the tip portion 47. A concave groove 65 in which an O-ring (not shown) is externally formed is formed in the small diameter portion 63, and an orthogonal hole 66 perpendicular to the axis of the small diameter portion 63 is formed through the concave groove 65. The rear end of the axial hole 53 and the pin 55 in a state where the front end 47 is mounted is located in front of the front surface of the arm 48 of the anvil 4 and rearward of the rear end of the socket 60.

一方、ハンドル３の上部では、トリガ７１を前方へ突出させたトリガスイッチ７０が設けられると共に、ブラシレスモータ１２の正逆切替ボタン７２が設けられている。トリガ７１の上方で本体ハウジング７には、ハンマケース８の下面を覆ってトリガ７１よりも前方へ突出する延設部７３が形成されて、延設部７３の先端に、アンビル４の前方を照射するＬＥＤ７５を有するライトユニット７４が設けられている。
バッテリー装着部５には、ブラシレスモータ１２の制御用のスイッチング素子やマイコン等を搭載した制御回路基板７７を備えるコントローラ７６と、装着されたバッテリーパック６の端子と電気的に接続される端子台７８とが収容されている。また、バッテリー装着部５には、打撃力の切替ボタンと表示ランプ等を有して制御回路基板７７へ電気的に接続されるスイッチパネル７９が設けられている。さらに、バッテリー装着部５の左側面には、正面視がＵ字状の吊り下げフック８０の一端がネジ固定されている。 On the other hand, at the upper part of the handle 3, a trigger switch 70 that makes the trigger 71 protrude forward is provided, and a forward / reverse switching button 72 of the brushless motor 12 is provided. An extension part 73 that covers the lower surface of the hammer case 8 and protrudes forward from the trigger 71 is formed in the main body housing 7 above the trigger 71, and the front of the anvil 4 is irradiated to the tip of the extension part 73. A light unit 74 having an LED 75 is provided.
The battery mounting unit 5 includes a controller 76 including a control circuit board 77 on which a switching element for controlling the brushless motor 12 and a microcomputer are mounted, and a terminal block 78 electrically connected to terminals of the mounted battery pack 6. And is housed. In addition, the battery mounting portion 5 is provided with a switch panel 79 that has an impact force switching button, a display lamp, and the like and is electrically connected to the control circuit board 77. Furthermore, one end of a hanging hook 80 having a U-shape in front view is screwed to the left side surface of the battery mounting portion 5.

以上の如く構成されたインパクトレンチ１においては、トリガ７１を押し込み操作すると、トリガスイッチ７０がＯＮしてバッテリーパック６の電源によってブラシレスモータ１２が駆動する。すなわち、制御回路基板７７のマイコンが、センサ回路基板２１の回転検出素子から出力されるロータ１６の永久磁石２４の位置を示す回転検出信号を得てロータ１６の回転状態を取得し、取得した回転状態に応じて各スイッチング素子のＯＮ／ＯＦＦを制御し、ステータ１５の各コイル２０に対し順番に電流を流すことでロータ１６を回転させる。よって、回転軸２２が回転してキャリア部３１の遊星歯車３２を遊星運動させることでスピンドル１３が減速回転し、ボール４１を介してハンマ３７を回転させるため、ハンマ３７が係合するアンビル４が回転してソケット６０によるボルト等の締付が可能となる。また、スイッチパネル７９の操作でライトＯＮ状態とすれば、トリガスイッチ７０のＯＮによってＬＥＤ７５が点灯してソケット６０の前方を照射する。 In the impact wrench 1 configured as described above, when the trigger 71 is pushed in, the trigger switch 70 is turned on and the brushless motor 12 is driven by the power supply of the battery pack 6. That is, the microcomputer of the control circuit board 77 obtains the rotation detection signal indicating the position of the permanent magnet 24 of the rotor 16 output from the rotation detection element of the sensor circuit board 21, acquires the rotation state of the rotor 16, and acquires the obtained rotation. The rotor 16 is rotated by controlling ON / OFF of each switching element in accordance with the state, and passing current to each coil 20 of the stator 15 in order. Therefore, the rotating shaft 22 rotates to cause the planetary gear 32 of the carrier portion 31 to perform a planetary motion, whereby the spindle 13 is decelerated and rotated, and the hammer 37 is rotated via the ball 41. Therefore, the anvil 4 with which the hammer 37 is engaged is The bolt 60 or the like can be tightened by the socket 60 by rotating. If the light is turned on by operating the switch panel 79, the LED 75 is turned on when the trigger switch 70 is turned on, and the front of the socket 60 is irradiated.

締付が進んでアンビル４のトルクが高まると、ハンマ３７がコイルバネ３８の付勢に抗してボール４１を内側カム溝４０に沿って後方へ転動させながら後退し、爪がアーム４８から外れると、コイルバネ３８の付勢によってボール４１を内側カム溝４０に沿って前方へ転動させることでハンマ３７は回転しながら前進し、爪をアーム４８に再係合させてアンビル４に回転打撃力（インパクト）を発生させる。このインパクトを間欠的に繰り返すことでさらなる締付が行われる。 When tightening progresses and the torque of the anvil 4 increases, the hammer 37 moves backward while rolling the ball 41 along the inner cam groove 40 against the bias of the coil spring 38, and the pawl is detached from the arm 48. When the ball 41 rolls forward along the inner cam groove 40 by the urging of the coil spring 38, the hammer 37 advances while rotating, the claws are re-engaged with the arm 48, and the rotating impact force is applied to the anvil 4. (Impact) is generated. Further tightening is performed by intermittently repeating this impact.

そして、アンビル４に大きなトルクが加わってアンビル４が図５（Ｄ）に示すように先端部４７の位置Ｐで折損することがあっても、軸心孔５３に遊挿されるピン５５はねじり応力を受けにくいため、ピン５５は折損を免れる。よって、折損した先端部４７の一部は、ピン５５によって分離することなくソケット６０と共に元の位置で保持され、落下を防止することができる。特にピン５５は、頭部５６が大径となっているので、頭部５６が開口部５４に係合することで折損した先端部分の分離が効果的に防止される。 Even if a large torque is applied to the anvil 4 and the anvil 4 breaks at the position P of the tip portion 47 as shown in FIG. 5D, the pin 55 loosely inserted into the axial hole 53 has torsional stress. Since the pin 55 is difficult to receive, the pin 55 is not broken. Therefore, a part of the broken tip portion 47 is held at the original position together with the socket 60 without being separated by the pin 55, and can be prevented from falling. In particular, since the pin 56 has a large diameter at the head portion 56, separation of the tip portion that is broken when the head portion 56 engages with the opening 54 is effectively prevented.

このように、上記形態のインパクトレンチ１によれば、アンビル４は、外形円筒状の基端部４６と、基端部４６と連続する外形角筒状の先端部４７とを有すると共に、基端部４６と先端部４７とに跨がってアンビル４内で軸線方向に形成される軸心孔５３を有し、軸心孔５３に、ピン５５が挿入されているので、アンビル４が折損することがあっても、ピン５５の存在により、先端部４７が分離することがないため、ソケット６０の本体部２からの分離及び落下を防止することができる。
特にここでは、軸心孔５３を、アンビル４の軸心に形成しているので、ねじり応力が加わりにくい位置にピン５５を配置でき、ピン５５が折損するおそれが低減される。 As described above, according to the impact wrench 1 of the above-described form, the anvil 4 has the outer cylindrical base end portion 46 and the outer shape square cylindrical tip portion 47 continuous with the base end portion 46, and the base end. Since it has the axial hole 53 formed in the axial direction in the anvil 4 across the part 46 and the front-end | tip part 47 and the pin 55 is inserted in the axial hole 53, the anvil 4 breaks. Even if this occurs, the tip portion 47 is not separated due to the presence of the pin 55, so that the socket 60 can be prevented from being separated from the main body portion 2 and dropped.
In particular, here, since the axial hole 53 is formed in the axial center of the anvil 4, the pin 55 can be disposed at a position where the torsional stress is not easily applied, and the possibility that the pin 55 is broken is reduced.

また、基端部４６側で軸心孔５３とピン５５との間に、ピン５５の抜け止め手段を設けているので、先端部４７が折損した際にピン５５が基端部４６から外れることが阻止され、先端部４７の分離を確実に防止できる。
さらに、抜け止め手段を、ピン５５に外装されて軸心孔５３の内面を押圧するリングスプリング５７としているので、ピン５５の抜け止めが簡単に行える。
そして、ピン５５に、先端部４７の端面に係合する頭部５６が設けられているので、抜け止めされたピン５５による先端部４７の分離防止が効果的に行える。 Further, since the pin 55 is provided between the shaft hole 53 and the pin 55 on the base end portion 46 side, the pin 55 is detached from the base end portion 46 when the tip end portion 47 is broken. Is prevented, and the separation of the tip 47 can be reliably prevented.
Furthermore, since the retaining means is a ring spring 57 that is externally mounted on the pin 55 and presses the inner surface of the axial hole 53, the retaining of the pin 55 can be easily performed.
Since the pin 55 is provided with the head portion 56 that engages with the end surface of the tip portion 47, it is possible to effectively prevent the tip portion 47 from being separated by the pin 55 that has been prevented from coming off.

なお、軸心孔５３及びピン５５の後端は、図５（Ｅ）に示すようにアーム４８の前面位置まで後方へ長くしてもよい。これは以下の変更例においても同様である。また、抜け止め手段である弾性体もリングスプリング以外にＯリング等も採用できる。
但し、ピン５５の抜け止め手段は、リングスプリング５７に限らず、図６に示すように、軸心孔５３の後端部分５３ａのみをピン５５の外径と略同径として、ピン５５の後端を後端部分５３ａに圧入させる構造としてもよい。
また、抜け止め手段として、図７に示すように、軸心孔５３の全長をピン５５の外径と略同径として、ピン５５全体を軸心孔５３に圧入させる構造としてもよい。この場合、ピン５５全体で抜け止めが行われるため、大径の開口部５４や頭部５６は不要となる。但し、全体でねじり応力を受けることになるため、先端部４７と同時に折損しないように、同じ鉄製でもピン５５の方の強度を高くしている。 Note that the rear ends of the axial hole 53 and the pin 55 may be elongated backward to the front position of the arm 48 as shown in FIG. The same applies to the following modifications. In addition to the ring spring, an O-ring or the like can be adopted as the elastic body as the retaining means.
However, the retaining means for the pin 55 is not limited to the ring spring 57, and only the rear end portion 53a of the shaft hole 53 is substantially the same diameter as the outer diameter of the pin 55 as shown in FIG. A structure may be adopted in which the end is press-fitted into the rear end portion 53a.
Further, as shown in FIG. 7, as the retaining means, the entire length of the shaft hole 53 may be approximately the same as the outer diameter of the pin 55, and the entire pin 55 may be press-fitted into the shaft hole 53. In this case, since the pin 55 is prevented from coming off, the large-diameter opening 54 and the head 56 are unnecessary. However, since it receives torsional stress as a whole, the strength of the pin 55 is increased even if it is made of the same iron so as not to be broken at the same time as the tip portion 47.

このように、抜け止め手段を、軸心孔５３に対するピン５５の少なくとも一部の圧入としても、ピン５５の抜け止めが簡単に行える。
また、ピン５５をアンビル４よりも強度の高い材料で形成すれば、アンビル４と共にピン５５が折損するおそれが一層少なくなる。但し、ピンはアンビルと同じ鉄製に限らず、靱性のある樹脂や合金等の他の材料で作製することもできる。 Thus, even if the retaining means is a press-fit of at least a part of the pin 55 with respect to the axial hole 53, the retaining of the pin 55 can be easily performed.
Further, if the pin 55 is formed of a material having a higher strength than the anvil 4, the possibility that the pin 55 is broken together with the anvil 4 is further reduced. However, the pin is not limited to the same iron as the anvil but can be made of other materials such as tough resin or alloy.

加えて、アンビル４の形状も上記形態に限らず、例えば図８に示すように、アンビル４の後端軸心に、スピンドル１３の先端が挿入される前有底孔５８が形成される場合は、軸心孔５３を前有底孔５８と連通するまで貫通形成して、リングスプリング５７を備えたピン５５を遊挿するようにしてもよい。この構造であってもピン５５によるソケット６０の落下防止は可能である。
また、この構造の場合も、図９に示すように、軸心孔５３の後端部分５３ａをピン５５と略同径として部分的に圧入したり、図１０に示すように、軸心孔５３の全体をピン５５と略同径として全体を圧入したりして抜け止め手段を構成しても差し支えない。
そして、上記形態や各変更例において、ピン５５の径は、先端部４７の面取部分の幅（図４に示す幅Ｈ）に対して２５％以下とするのが望ましい。これを越えると先端部４７の欠損部分が大きくなりすぎて先端部４７の有効断面積が小さくなり、強度低下に繋がるからである。また、トルクが大きくなるとピン５５に加わるねじり応力も大きくなるため、２５％以下であってもトルクが大きくなるに従ってピン５５の径の割合を小さく設定するのが望ましい。 In addition, the shape of the anvil 4 is not limited to the above form. For example, as shown in FIG. 8, when a front bottomed hole 58 into which the tip of the spindle 13 is inserted is formed in the rear end axis of the anvil 4. Alternatively, the shaft hole 53 may be formed so as to penetrate the front bottom hole 58 and the pin 55 provided with the ring spring 57 may be loosely inserted. Even with this structure, it is possible to prevent the socket 60 from falling by the pins 55.
Also in the case of this structure, as shown in FIG. 9, the rear end portion 53a of the axial hole 53 is partially press-fitted with substantially the same diameter as the pin 55, or the axial hole 53 as shown in FIG. It is also possible to form a retaining means by making the whole of the pin 55 approximately the same diameter as the pin 55 and press-fitting the whole.
And in the said form and each modification, it is desirable for the diameter of the pin 55 to be 25% or less with respect to the width | variety of the chamfered part of the front-end | tip part 47 (width | variety H shown in FIG. 4). If this is exceeded, the chipped portion of the tip portion 47 becomes too large and the effective cross-sectional area of the tip portion 47 becomes small, leading to a reduction in strength. Further, since the torsional stress applied to the pin 55 also increases as the torque increases, it is desirable to set the ratio of the diameter of the pin 55 smaller as the torque increases even if it is 25% or less.

一方、ピン５５は１本に限らず、２本設けることもできる。図１１，１２はその一例を示すもので、インパクトレンチ１自体の構成は先の形態と略同じであるため、重複する説明は省略する。
ここでのアンビル４は、図８と同様に、後端軸心に、スピンドル１３の先端に設けた凸部８１が挿入される前有底孔５８が形成されている。アンビル４の先端部４７には、図１３にも示すように、軸線を中心とした上下の点対称位置に、一対の孔８２，８２が、後端が前有底孔５８の前端よりやや前方となる位置まで形成されている。孔８２，８２の間で先端部４７には、装着されたソケット６０の直交孔６６に跨がって抜け止め用ピンを貫通させるための貫通孔８３が貫通形成されている。そして、各孔８２には、孔８２の内径と略同径で、アンビル４よりも強度が高い鉄製のピン５５がそれぞれ全体を圧入させることで固定されている。 On the other hand, the number of pins 55 is not limited to one, and two pins 55 may be provided. FIGS. 11 and 12 show an example thereof, and the configuration of the impact wrench 1 itself is substantially the same as that of the previous embodiment, and therefore redundant description is omitted.
In the anvil 4 here, a front bottomed hole 58 into which a convex portion 81 provided at the tip of the spindle 13 is inserted is formed at the rear end axis as in FIG. As shown in FIG. 13, the anvil 4 has a pair of holes 82, 82 at the upper and lower point symmetrical positions around the axis, and the rear end is slightly forward of the front end of the front bottomed hole 58. It is formed up to the position. A through-hole 83 is formed in the tip portion 47 between the holes 82 and 82 so as to penetrate the orthogonal hole 66 of the attached socket 60 and allow the retaining pin to pass therethrough. In each hole 82, an iron pin 55 having substantially the same diameter as the inner diameter of the hole 82 and higher in strength than the anvil 4 is fixed by press-fitting the whole.

このように、孔８２，８２を、貫通孔８３を挟んでアンビル４の軸心を中心とした点対称位置に一対設けて、各孔８２にピン５５をそれぞれ挿入した場合も、アンビル４に大きなトルクが加わってアンビル４が図１３（Ｄ）に示すように先端部４７の位置Ｐで折損することがあっても、ピン５５，５５は変形しつつ折損を免れる。よって、折損した先端部４７の一部は、圧入されたピン５５，５５によって分離することなくソケット６０と共に元の位置で保持され、落下を防止することができる。
この場合、ピン５５，５５はアンビル４よりも強度を高くするのが望ましい。 As described above, when the holes 82 and 82 are provided at a point-symmetrical position around the axis of the anvil 4 with the through hole 83 interposed therebetween, and the pin 55 is inserted into each hole 82, the anvil 4 is also large. Even if the anvil 4 is broken at the position P of the tip portion 47 as shown in FIG. 13 (D) due to the torque, the pins 55 and 55 are deformed and are not broken. Therefore, a part of the broken tip portion 47 is held at the original position together with the socket 60 without being separated by the press-fit pins 55, 55, and can be prevented from falling.
In this case, it is desirable that the pins 55 and 55 have higher strength than the anvil 4.

なお、ピン５５が２本の場合も全体的な圧入に限らず、図１４に示すように、各孔８２の後端部分８２ａのみをピン５５の外径と略同径として部分的に圧入させ、頭部５６を大径とした開口部８４に係合させるようにしてもよい。
また、図１５に示すように、ピン５５の全体を孔８２に遊挿させて後端に外装したリングスプリング５７を孔８２の内面に押圧させて抜け止めを図ってもよい。
さらに、ピン５５の長さも、アンビル４の後端に前有底孔５８がなければさらに長くしてもよいし、孔８２及びピン５５の数を３つ以上として同心円上に配置することもできる。 When the number of the pins 55 is two, not only the overall press-fitting, but only the rear end portion 82a of each hole 82 is partially press-fitted with the same diameter as the outer diameter of the pin 55 as shown in FIG. The head 56 may be engaged with the opening 84 having a large diameter.
Further, as shown in FIG. 15, the entire pin 55 may be loosely inserted into the hole 82, and the ring spring 57, which is externally mounted on the rear end, may be pressed against the inner surface of the hole 82 to prevent the pin 55 from coming off.
Further, the length of the pin 55 may be further increased if there is no front bottomed hole 58 at the rear end of the anvil 4, and the number of the holes 82 and the pins 55 may be three or more and arranged concentrically. .

一方、ソケットの落下防止としては横断面円形のピンに限らず、横断面角形や多角形、平板状の部材とする等、アンビルが折損しても工具本体から分離しないようにするための分離防止手段としての分離防止部材を採用することは可能である。この場合、アンビルの外周から分離防止部材で固定して分離不能としたり、アンビルとハウジング（ハンマケースやバンパも含む）との間を分離防止部材で接続して分離不能としたりすることが考えられる。 On the other hand, the fall prevention of the socket is not limited to a pin with a circular cross section, but a separation prevention to prevent separation from the tool body even if the anvil breaks, such as a square, polygonal, flat plate member, etc. It is possible to employ a separation preventing member as a means. In this case, it can be considered that the separation from the outer periphery of the anvil is fixed by a separation preventing member, or the separation between the anvil and the housing (including the hammer case and the bumper) is made by the separation preventing member. .

そして、アンビル４が図１１，１２のように前有底孔５８と貫通孔８３とを備える場合、ピンを２本設ける上記変更例の他、図１６に示すような変更例も考えられる。
ここではアンビル４の軸心に軸心孔５３を設けて、その軸心孔５３に、連結部材としてのワイヤ９０を挿入している。ワイヤ９０の後端は、前有底孔５８に設けられた軸心孔５３の直径よりもよりも大径の拡径部としてのスチールボール９１にかしめ固定されている。一方、軸心孔５３の前方で貫通孔８３内には、軸心孔５３の直径よりも大径に形成された拡径部としてのＯリング９２が同軸で配置されて、ワイヤ９０の前端は、貫通孔８３内でＯリング９２を貫通係止している。Ｏリング９２を貫通係止したワイヤ９０の前端は、軸心孔５３内へ折り返されて、ワイヤ９０の中間部に沿って挿入される折り返し部９３となっている。貫通孔８３内には、図１７に示すように、軸心孔５３の前方でＯリング９２を保持する保持溝９４がリング状に形成されており、ここに保持されるＯリング９２の内径は、貫通孔８３の内径と等しくなっている。このＯリング９２の内径は、後述する抜け止めピン６７が貫通できればよいため、貫通孔８３の内径とは多少の相違があってもよい。 And when the anvil 4 is provided with the front bottomed hole 58 and the through-hole 83 like FIG.11, 12, in addition to the said modified example which provides two pins, the modified example as shown in FIG. 16 is also considered.
Here, an axial hole 53 is provided in the axial center of the anvil 4, and a wire 90 as a connecting member is inserted into the axial hole 53. The rear end of the wire 90 is caulked and fixed to a steel ball 91 as an enlarged diameter portion larger than the diameter of the axial hole 53 provided in the front bottomed hole 58. On the other hand, in the through hole 83 in front of the axial hole 53, an O-ring 92 as a diameter-enlarged portion formed larger than the diameter of the axial hole 53 is coaxially arranged, and the front end of the wire 90 is The O-ring 92 is locked through in the through hole 83. The front end of the wire 90 penetrating and locking the O-ring 92 is folded back into the axial hole 53 to form a folded portion 93 that is inserted along the middle portion of the wire 90. In the through hole 83, as shown in FIG. 17, a holding groove 94 for holding the O-ring 92 is formed in a ring shape in front of the axial hole 53, and the inner diameter of the O-ring 92 held therein is The inner diameter of the through hole 83 is equal. The inner diameter of the O-ring 92 may be slightly different from the inner diameter of the through hole 83 as long as the retaining pin 67 described later can pass therethrough.

よって、図１８に示すように、アンビル４の先端部４７にソケット６０を嵌合させて直交孔６６と貫通孔８３とに跨がって抜け止めピン６７を挿入し、凹溝６５にＯリング６８を外装させれば、ソケット６０が装着される。このとき貫通孔８３内では、図１９にも示すように、抜け止めピン６７がＯリング９２を貫通しているので、ワイヤ９０の前端は、Ｏリング９２及び抜け止めピン６７を介して後方側への抜け止めがなされる。また、ワイヤ９０の後端はスチールボール９１によって前方側への抜け止めがなされる。このため、先端部４７が例えばＯリング９２より後方の位置（図１８（Ａ）に示す位置Ｐ１）で折損することがあっても、前後端が抜け止めされるワイヤ９０の存在により、先端部４７が分離することがなく、ソケット６０も分離しない。また、貫通孔８３の位置（図１８（Ｂ）に示す位置Ｐ２）で折損することがあっても、Ｏリング９２を貫通する抜け止めピン６７によりソケット６０は分離しないため、先端部４７も分離することはない。 Therefore, as shown in FIG. 18, the socket 60 is fitted to the tip portion 47 of the anvil 4, the retaining pin 67 is inserted across the orthogonal hole 66 and the through hole 83, and the O-ring is inserted into the groove 65. If the 68 is put on the exterior, the socket 60 is attached. At this time, as shown in FIG. 19, the retaining pin 67 passes through the O-ring 92 in the through-hole 83, so that the front end of the wire 90 is on the rear side via the O-ring 92 and the retaining pin 67. A slip-off is made. Further, the rear end of the wire 90 is prevented from coming forward by a steel ball 91. For this reason, even if the tip portion 47 breaks at a position behind the O-ring 92 (position P1 shown in FIG. 18A), for example, the tip portion is prevented by the presence of the wire 90 that prevents the front and rear ends from coming off. 47 is not separated, and the socket 60 is not separated. Even if the socket 60 is broken at the position of the through-hole 83 (position P2 shown in FIG. 18B), the socket 60 is not separated by the retaining pin 67 that penetrates the O-ring 92. Never do.

このように、図１６に示す変更例によれば、軸心孔５３の内部に、基端部４６と先端部４７とに跨がってアンビル４の軸線方向に延びる連結部材（ワイヤ９０）が設けられていると共に、ワイヤ９０における基端部４６側の端部と先端部４７側の端部とに、軸心孔５３の直径よりも大きい拡径部（スチールボール９１、Ｏリング９２）がそれぞれ一体的に設けられているので、アンビル４が折損することがあっても、ワイヤ９０の存在により先端部４７が分離することがない。よって、ソケット６０の本体部２からの分離及び落下を防止することができる。 As described above, according to the modification shown in FIG. 16, the connecting member (wire 90) extending in the axial direction of the anvil 4 across the proximal end portion 46 and the distal end portion 47 in the axial hole 53. In addition, a diameter-enlarged portion (steel ball 91, O-ring 92) larger than the diameter of the axial hole 53 is provided at the end portion on the proximal end portion 46 side and the end portion on the distal end portion 47 side of the wire 90. Since they are integrally provided, the tip portion 47 is not separated by the presence of the wire 90 even if the anvil 4 breaks. Therefore, separation and fall of the socket 60 from the main body 2 can be prevented.

特にここでは、先端部４７側で貫通孔８３内に設けられるＯリング９２を、貫通孔８３の内径と同径としているので、Ｏリング９２を設けても抜け止めピン６７を支障なく挿通できる。
また、抜け止めピン６７はＯリング９２を貫通するので、抜け止めピン６７を利用したワイヤ９０の抜け止め（ソケット６０の分離及び落下防止）が行える。
さらに、連結部材をワイヤ９０とし、リング状の拡径部を、ワイヤ９０の端部が係止するＯリング９２としたことで、先端部４７の分離及び落下の防止が簡単に行える。
そして、基端部４６側に設けられる拡径部を、前有底孔５８内でワイヤ９０に連結されるスチールボール９１としたことで、前有底孔５８を利用したワイヤ９０の抜け止めが簡単に行える。 In particular, here, since the O-ring 92 provided in the through hole 83 on the distal end portion 47 side has the same diameter as the inner diameter of the through hole 83, the retaining pin 67 can be inserted without any trouble even if the O-ring 92 is provided.
Further, since the retaining pin 67 penetrates the O-ring 92, the retaining of the wire 90 using the retaining pin 67 (separation of the socket 60 and prevention of dropping) can be performed.
Further, since the connecting member is the wire 90 and the ring-shaped enlarged diameter portion is the O-ring 92 that is engaged with the end portion of the wire 90, the tip portion 47 can be easily separated and prevented from falling.
Then, the diameter-enlarged portion provided on the base end portion 46 side is the steel ball 91 connected to the wire 90 in the front bottomed hole 58, so that the wire 90 using the front bottomed hole 58 is prevented from coming off. Easy to do.

なお、上記変更例では、先端部４７側の拡径部をＯリングとしているが、これに限らず、金属製や樹脂製のリング体を設けてワイヤを係止させてもよい。また、図２０，２１に示すように、ワイヤ９０の前端をリング状に折り曲げて拡径部９５を形成し、この拡径部９５を保持溝９４に保持させて折り返し部９３を軸心孔５３に挿入させて抜け止めを図ることもできる。
このようにリング状の拡径部９５をワイヤ９０の端部を折り曲げて形成すれば、抜け止めが簡単に行える。
一方、基端部側の拡径部もスチールボール以外にピン等の他の部材を採用してもよいし、他の部材を用いずにワイヤの後端をリング状やフック状に折り曲げて拡径部としてもよい。 In addition, in the said modification, although the enlarged diameter part by the side of the front-end | tip part 47 is made into an O-ring, it is not restricted to this, A metal or resin-made ring body may be provided and a wire may be latched. 20 and 21, the front end of the wire 90 is bent into a ring shape to form an enlarged diameter portion 95, and the enlarged diameter portion 95 is held in a holding groove 94 so that the folded portion 93 is formed into the axial hole 53. It can also be inserted to prevent slipping out.
If the ring-shaped enlarged diameter portion 95 is formed by bending the end portion of the wire 90 as described above, it can be easily prevented from coming off.
On the other hand, the expanded diameter portion on the base end side may be made of other members such as pins in addition to the steel balls, or the rear end of the wire may be bent into a ring shape or a hook shape without using other members. It is good also as a diameter part.

また、孔はアンビルの軸心に設ける場合に限らず、偏心位置に設けて連結部材及び拡径部で抜け止めを図ってもよいし、孔を複数設けてそれぞれに連結部材及び拡径部を設けてもよい。なお、孔を複数設ける場合は、例えば軸心を挟む左右に一対の孔を設けて一本のワイヤを挿通させ、ワイヤの前部を貫通孔の保持溝に沿って周回させて拡径部を形成することも考えられる。
但し、連結部材としてはワイヤに限らず、金属製や樹脂製のピン等も採用できる。この場合の拡径部も別体の部材で形成したり、一体に形成したりすればよい。 In addition, the hole is not limited to being provided in the center of the anvil, and may be provided at an eccentric position to prevent the connection member and the enlarged diameter portion from coming off, or a plurality of holes may be provided, and the connection member and the enlarged diameter portion may be provided respectively. It may be provided. In the case of providing a plurality of holes, for example, a pair of holes are provided on the left and right sides of the shaft center, a single wire is inserted, and the front portion of the wire is circulated along the holding groove of the through hole to form the enlarged diameter portion. Forming is also conceivable.
However, the connecting member is not limited to a wire, and a metal or resin pin can be used. The enlarged diameter portion in this case may be formed of a separate member or formed integrally.

その他、インパクト工具としては、モータがブラシレスでないものや、バッテリーパックでなく交流電源を使用するものでもよいし、インパクトレンチに限らず、アンビルをスピンドルに対して直角に設けたアングルインパクトレンチや、インパクトドライバ、アングルインパクトドライバ等であっても本発明は採用可能である。例えばインパクトドライバでは、ビットを差込装着するためにアンビルの軸心に設けられた装着孔の径方向外側に、１又は２本のピンを配置することが考えられる。 In addition, as an impact tool, a motor whose brush is not brushless, an AC power supply instead of a battery pack may be used, and not only an impact wrench but also an angle impact wrench with an anvil provided at right angles to the spindle, impact The present invention can be adopted even with a driver, an angle impact driver, or the like. For example, in an impact driver, it is conceivable to arrange one or two pins on the radially outer side of a mounting hole provided in the center of an anvil for inserting and mounting a bit.

１・・インパクトレンチ、２・・本体部、３・・ハンドル、４・・アンビル、６・・バッテリーパック、７・・本体ハウジング、８・・ハンマケース、１２・・ブラシレスモータ、１３・・スピンドル、１４・・打撃機構、２２・・回転軸、３７・・ハンマ、４３・・軸受部、４６・・基端部、４７・先端部、４８・・アーム、５３・・軸心孔、５３ａ・・後端部分、５５・・ピン、５６・・頭部、５７・・リングスプリング、６０・・ソケット、６７・・抜け止めピン、８２・・孔、８２ａ・・後端部分、８３・・貫通孔、９０・・ワイヤ、９１・・スチールボール、９２・・Ｏリング、９５・・拡径部、Ｐ，Ｐ１，Ｐ２・・折損位置。 1 ・・ Impact wrench, 2 ・・ Main body, 3 ・ Handle, 4 ・・ Anvil, 6 ・・ Battery pack, 7 ・・ Main body housing, 8 ・ Hammer case, 12 ・・ Brushless motor, 13 ・ Spindle , 14 .. Strike mechanism, 22 .. Rotating shaft, 37 .. Hammer, 43 .. Bearing part, 46 .. Base end part, 47. Tip part, 48 .. Arm, 53 .. Shaft hole, 53 a · Rear end portion, 55 ·· Pin, 56 ·· Head, 57 ·· Ring spring, 60 ·· Socket, 67 ·· Retaining pin, 82 ·· Hole, 82a ·· Rear end portion, 83 ·· Penetrating Hole, 90 ... Wire, 91 ... Steel ball, 92 ... O-ring, 95 ... Expanded part, P, P1, P2 ... Broken position.

Claims

A motor,
A hammer rotated by the motor;
An axial anvil that is struck in the rotational direction by the hammer,
The anvil has an outer cylindrical base end portion and an outer rectangular tube-shaped distal end portion continuous with the base end portion, and straddles the base end portion and the distal end portion within the anvil. Having holes formed in the axial direction;
An impact tool, wherein a pin is inserted into the hole.

The impact tool according to claim 1, wherein the hole is formed in an axis of the anvil.

A through-hole used for preventing the attached socket from coming off is formed in the tip portion in a direction orthogonal to the axial direction of the anvil, and the hole is centered on the axis of the anvil with the through-hole interposed therebetween. 2. The impact tool according to claim 1, wherein a pair is provided at a symmetrical position, and the pins are inserted into the holes. 3.

4. The impact tool according to claim 1, wherein the pin is made of a material having a higher strength than the anvil.

The impact tool according to any one of claims 1 to 4, wherein means for retaining the pin is provided between the hole and the pin on the base end side.

The impact tool according to claim 5, wherein the retaining means is an elastic body that is externally mounted on the pin and presses the inner surface of the hole.

The impact tool according to claim 5, wherein the retaining means is press-fitting at least a part of the pin into the hole.

The impact tool according to any one of claims 5 to 7, wherein the pin is provided with an engaging portion that engages with an end surface of the tip portion.

A motor,
A hammer rotated by the motor;
An impact tool including a shaft-shaped anvil that is struck in the rotational direction by the hammer,
An impact tool characterized by comprising separation preventing means for making the anvil unseparable from the tool body when the anvil breaks.

A motor,
A hammer rotated by the motor;
An axial anvil that is struck in the rotational direction by the hammer,
The anvil has an outer cylindrical base end portion and an outer rectangular tube-shaped distal end portion continuous with the base end portion, and straddles the base end portion and the distal end portion within the anvil. Having holes formed in the axial direction;
A connecting member extending in the axial direction across the base end portion and the tip end portion is provided inside the hole, and an end portion on the base end portion side and the tip end portion of the connecting member An impact tool, wherein an enlarged diameter portion larger than the diameter of the hole is provided integrally with an end portion on the side.

A through hole used for preventing the attached socket from being detached is formed in the tip portion in a direction orthogonal to the axial direction of the anvil, and the enlarged diameter portion provided on the tip portion side is coaxial within the through hole. The impact tool according to claim 10, wherein the impact tool is formed in a ring shape, and an inner diameter of the through-hole and an inner diameter of the ring-shaped enlarged portion are the same.

The impact tool according to claim 11, wherein a retaining pin inserted into the through hole for retaining the socket penetrates the ring-shaped enlarged diameter portion.

The impact tool according to claim 11 or 12, wherein the connecting member is a wire, and the ring-shaped enlarged diameter portion is an O-ring that is engaged with an end portion of the wire.

The impact tool according to claim 11 or 12, wherein the connecting member is a wire, and the ring-shaped enlarged diameter portion is formed by bending an end portion of the wire.

The base end portion is formed with a bottomed hole that communicates coaxially with the hole, and the enlarged diameter portion provided on the base end side is connected to the connecting member within the bottomed hole. The impact tool according to any one of claims 10 to 14, wherein: