JP6270122B2 - SDS plus shank - Google Patents

SDS plus shank Download PDF

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JP6270122B2
JP6270122B2 JP2013273914A JP2013273914A JP6270122B2 JP 6270122 B2 JP6270122 B2 JP 6270122B2 JP 2013273914 A JP2013273914 A JP 2013273914A JP 2013273914 A JP2013273914 A JP 2013273914A JP 6270122 B2 JP6270122 B2 JP 6270122B2
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shank
drilling
sds plus
chuck
tool
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JP2015127135A (en
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孝之 柳生
孝之 柳生
和久 盛田
和久 盛田
和也 伊藤
和也 伊藤
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ユニカ株式会社
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Description

主としてコンクリートや石材に穿孔するコンクリートドリルやコアドリルなどの穿孔工具を、電動工具のチャック部に装着固定するために用いられるSDSプラス型シャンクに関する。  The present invention relates to an SDS plus type shank used for mounting and fixing a drilling tool such as a concrete drill or a core drill for drilling mainly in concrete or stone to a chuck portion of an electric power tool.

コンクリートや石材に、アンカーボルトを取り付ける孔、配管を通過させる孔、などを明ける時は、穿孔する孔の直径、深さ、被穿孔材の材質、に適した刃先部をもつコンクリートドリル、コアドリルなどの穿孔工具のシャンクを、モータを内蔵した電動工具のチャックに挿入装着し、これを回転して穿孔することが多い。穿孔に必要な回転トルクは、電動工具に内蔵されたモータから電動工具のチャックを経由して穿孔工具のシャンクに伝達され、刃先部に伝えられる。  When drilling holes for attaching anchor bolts or pipes to concrete or stone, when drilling holes, such as concrete drills, core drills, etc., with a cutting edge suitable for the diameter and depth of the holes to be drilled and the material of the material to be drilled In many cases, the shank of this drilling tool is inserted into and mounted on a chuck of an electric tool with a built-in motor, and this is rotated for drilling. The rotational torque necessary for drilling is transmitted from the motor built in the power tool to the shank of the drill tool via the chuck of the power tool, and is transmitted to the cutting edge.

穿孔時は、被穿孔材の材質などにより、連続回転穿孔、ハンマーリング穿孔、衝撃穿孔などの異なる穿孔方式から適当な方式を選択する。使われる電動工具としては、海外の工具会社が開発したSDSプラス型チャックか、汎用ボール盤などでよく使われている、いわゆる三つ爪型チャックの、いずれか一方のチャックを持つものが一般的である。  At the time of drilling, an appropriate method is selected from different drilling methods such as continuous rotation drilling, hammer ring drilling, and impact drilling depending on the material of the material to be drilled. As power tools to be used, SDS plus type chucks developed by overseas tool companies or so-called three-jaw type chucks that are often used in general-purpose drilling machines, etc., are generally used. is there.

電動工具のチャックが、SDSプラス型か三つ爪型かで把持方式が全く異なるため、それぞれのチャック方式に対応した仕様のシャンク形状をもつ穿孔工具を適用しないと、チャックとシャンクの結合はうまくいかず、正常に穿孔することはできない。  The gripping method is completely different depending on whether the power tool chuck is an SDS plus type or a three-claw type. Therefore, unless a drilling tool with a shank shape corresponding to each chucking method is applied, the chuck and shank will be connected well. It cannot be drilled normally.

図7及び図8に、SDSプラス型シャンクをもつドリルを示す。図7はコンクリートドリル10で、刃先部11とSDSプラス型シャンク1で構成されている。図8はコアドリル11で、SDSプラス型シャンク1と、大きな直径の穿孔ができる刃先部11をもつ。これらのSDSプラス型シャンク1は、図9で示されるようにシャンク端面5の側の円周部6に、一対の円形溝3と、これに直交する位置に一対のキー溝4が加工されていて、その断面は図10で示すようになっている。  7 and 8 show a drill having an SDS plus shank. FIG. 7 shows a concrete drill 10 including a cutting edge portion 11 and an SDS plus type shank 1. FIG. 8 shows a core drill 11 having an SDS plus type shank 1 and a cutting edge portion 11 capable of drilling a large diameter. In these SDS plus type shanks 1, as shown in FIG. 9, a pair of circular grooves 3 and a pair of key grooves 4 are machined in a circumferential portion 6 on the shank end surface 5 side at a position orthogonal to the circular grooves 3. The cross section is as shown in FIG.

このSDSプラス型シャンク1が装着される電動工具のチャック部には、一対のキー部材と、一対の半径方向に移動可能な鋼球が内蔵されていて、キー部材はシャンクのキー溝4に滑合して電動工具に内蔵されたモータの回転トルクをドリルに伝達する役目を果たし、鋼球は円形溝3にはまり込んでドリルを軸方向に移動可能な状態で把持する機能を果たす。  A pair of key members and a pair of radially movable steel balls are incorporated in the chuck portion of the electric tool to which the SDS plus type shank 1 is mounted, and the key members slide in the key grooves 4 of the shank. The steel ball plays a role of transmitting the rotational torque of the motor built in the electric tool to the drill, and the steel ball fits into the circular groove 3 and functions to grip the drill while being movable in the axial direction.

チャックで把持した状態でドリルを手で軸方向に押したり引いたりすると、円形溝3にはまり込んだ鋼球が円形溝の長手方向の両端に当接する範囲内で、穿孔工具は電動工具に対して軸方向に摺動し、摺動している間も、チャック内のキー部材はシャンク1のキー溝4に滑合しているので、電動工具内のモータの回転トルクは穿孔工具に伝達される。  When the drill is pushed or pulled in the axial direction by hand while being held by the chuck, the drilling tool is against the electric tool within the range where the steel balls stuck in the circular groove 3 come into contact with both ends in the longitudinal direction of the circular groove. Since the key member in the chuck is in sliding contact with the key groove 4 of the shank 1, the rotational torque of the motor in the power tool is transmitted to the drilling tool. The

従って、ハンマーリング穿孔と呼ばれる、穿孔工具に打撃回転力を与えながら行う穿孔作業にSDSプラス型チャックと穿孔工具を使うと、打撃で生じる穿孔工具からの反動の一部が穿孔工具と電動工具の軸方向の相対位置変動で吸収されて、電動工具を持って穿孔している作業者に伝わる衝撃振動が緩和されることになり、作業負担が軽減されるという効果がある。  Therefore, when an SDS plus type chuck and a drilling tool are used for drilling work called hammer ring drilling while applying a hammering rotational force to the drilling tool, a part of the reaction from the drilling tool caused by the hammering is caused by the drilling tool and the electric tool. The shock vibration that is absorbed by the relative position fluctuation in the axial direction and is transmitted to the operator drilling with the electric power tool is alleviated, and the work load is reduced.

一方、三つ爪型チャックを持つ電動工具に装着して使用される穿孔工具のシャンクとしては、図11に示すように、円筒部6が完全に円形の、いわゆる完全丸棒型シャンク13か、図12に示すように、円周部6を三等分する位置に平面2が3か所形成された、いわゆる三面丸棒型シャンク14が一般的である。図13は三面丸棒型シャンク14の断面図を示す。  On the other hand, as a drilling tool shank used by being mounted on an electric tool having a three-jaw chuck, as shown in FIG. 11, the cylindrical portion 6 is a completely circular rod-shaped shank 13, As shown in FIG. 12, a so-called three-sided round bar-type shank 14 in which three planes 2 are formed at positions that divide the circumferential portion 6 into three equal parts is common. FIG. 13 shows a cross-sectional view of a three-sided round bar shank 14.

三面丸棒型シャンク14を持つ穿孔工具を電動工具の三つ爪型チャックで把持する時は、平面2が、チャックの爪の方向に向くように角度調整して挿入し把持する必要があり、完全丸棒型シャンク13の装着と比べると少々面倒だが、完全丸棒型シャンク13ではシャンクとチャックの爪の間で滑りが生じやすいのに対し、三面丸棒型シャンク14では、この滑りが発生しないため、大きな回転トルクが必要な穿孔を行うには三面丸棒型シャンク14を持つ穿孔工具を使うことが好ましい。  When gripping a drilling tool having a three-sided round bar shank 14 with a three-nail chuck of an electric tool, it is necessary to adjust the angle so that the plane 2 faces the direction of the nail of the chuck. Compared to the mounting of the full round bar shank 13, it is a little troublesome, but the full round bar shank 13 tends to slip between the shank and the claw of the chuck, whereas the three side round bar shank 14 causes this slip. Therefore, it is preferable to use a drilling tool having a three-sided round bar shank 14 for drilling that requires a large rotational torque.

しかし、完全な丸棒、または三つの平面を持つ丸棒、のシャンクを持ったドリルなどの穿孔工具は、三つ爪型チャックの電動工具に装着して穿孔に使うことはできるものの、キー溝も円形溝も加工されていないため、SDSプラス型チャックの電動工具には適用できない。逆に、SDSプラス型シャンク1をもつ穿孔用工具は、SDSプラス型チャックの電動工具には装着して使用できるが、三つ爪型チャックの電動工具に装着しても、SDSプラス型シャンクの特徴である円形溝とキー溝のために、三つの爪が正常にシャンクを把持できず、安定穿孔が不可能なばかりか、最悪の場合は、三つ爪型チャックの爪が破損したり、ドリルが振動で破損したりするという事故を起こす。  However, drilling tools such as drills with shanks of full round bars or round bars with three flat surfaces can be used for drilling by attaching them to electric tools of three-jaw type chucks, but key grooves Neither is it applicable to the power tool of the SDS plus type chuck. Conversely, the drilling tool having the SDS plus type shank 1 can be used by being attached to the electric tool of the SDS plus type chuck, but even if it is attached to the electric tool of the three jaw type chuck, the drilling tool of the SDS plus type shank can be used. Due to the characteristic circular groove and key groove, the three claws cannot normally grip the shank and stable drilling is impossible.In the worst case, the claws of the three-jaw chuck are damaged, Accidents occur when the drill is damaged by vibration.

以上で述べたように、SDSプラス型シャンクのコンクリートドリル、コアドリルなどの穿孔工具は、SDSプラス型チャックの電動工具では使用できるが、三つ爪型チャックの電動工具に装着して使うと、十分な穿孔トルクが穿孔工具に伝わらないために安定穿孔ができないだけでなく、三つ爪型チャックの爪がSDSプラス型シャンクの円形溝やキー溝に滑り込んで、爪が破損したり、ドリルが折れたりする問題を起こす。従って、SDSプラス型シャンクの穿孔工具は、SDSプラス型チャックの電動工具に限定して使用するしかなく、三つ爪型チャックの電動工具では使えない、という問題がある。  As mentioned above, drill tools such as SDS plus type shank concrete drills and core drills can be used with power tools of SDS plus type chucks. The drilling torque is not transmitted to the drilling tool, so stable drilling is not possible, and the jaws of the three-jaw chuck slide into the circular or key groove of the SDS plus shank, causing the nails to break or break the drill. Cause problems. Accordingly, there is a problem that the drill tool of the SDS plus type shank can only be used for the power tool of the SDS plus type chuck and cannot be used with the electric tool of the three-jaw type chuck.

上記の課題を解決するための本願発明は、シャンクに加工された一対のキー溝の少なくとも一方の溝に着脱可能なピンと、前記のピンが装着されるキー溝から左右に120度ずれた位置に平面をもつ、SDSプラス型シャンクである。  In order to solve the above problems, the present invention provides a pin that can be attached to and detached from at least one of a pair of key grooves machined into a shank, and a position that is shifted 120 degrees to the left and right from the key groove on which the pin is mounted. It is an SDS plus type shank with a flat surface.

電動工具のチャック方式がSDSプラス型の場合は、ピンを付けずにSDSプラス型シャンクとして使用する。電動工具のチャック方式が三つ爪型の場合は、ピンをキー溝に装着し、ピンと、シャンク円周面に加工された2つの平面の、合計3つの平面に三つ爪型チャックの爪が当接するように装着して使用する。  When the chuck method of the electric power tool is the SDS plus type, it is used as an SDS plus type shank without attaching a pin. When the chuck method of the electric tool is a three-claw type, the pin is attached to the keyway, and the claw of the three-claw type chuck is placed on a total of three planes: the pin and two planes machined on the shank circumferential surface. Install and use so that it contacts.

本願発明に係るSDSプラス型シャンクでは、ピンを着脱するだけで、SDSプラス型シャンクの穿孔工具を、SDSプラス型チャックの電動工具と、三つ爪型チャックの電動工具のいずれにも適用できる。従って、穿孔工具としての適用範囲が広く、穿孔作業時にシャンクの形式と電動工具のチャックの組合せを気にする必要はない。更に、穿孔工具を製造する会社では、SDSプラス型シャンクの穿孔工具、三面丸棒型シャンクの穿孔工具、の2種類の穿孔工具を造らずに、本願発明の、着脱可能なピンとSDSプラス型シャンクをもつ穿孔工具を造りさえすれば、SDSプラス型チャックの電動工具と三つ爪型チャックの電動工具の2つの市場に穿孔工具を供給できるようになるため、生産品種の削減ができ、不要な在庫を抱えることもない。  In the SDS plus type shank according to the present invention, the drilling tool of the SDS plus type shank can be applied to both the electric tool of the SDS plus type chuck and the electric tool of the three-jaw type chuck by simply attaching and detaching the pins. Therefore, the application range as a drilling tool is wide, and there is no need to worry about the combination of the shank type and the chuck of the electric tool during drilling work. Furthermore, the company that manufactures the drilling tool does not need to make two types of drilling tools, that is, an SDS plus type shank drilling tool and a three-sided round bar type shank drilling tool. As long as a drilling tool with a diameter is made, it will be possible to supply drilling tools to the two markets of power tools for SDS plus chucks and three-jaw chucks. There is no stock.

本願発明のSDSプラス型シャンクの一つの実施例を示す見取り図A sketch showing one embodiment of the SDS plus type shank of the present invention 本願発明のSDSプラス型シャンクに着脱可能なピンのひとつの実施例を示す見取り図The sketch which shows one Example of the pin which can be attached or detached to the SDS plus type | mold shank of this invention 本願発明のSDSプラス型シャンクに着脱可能なピンの別の実施例を示す見取り図The sketch which shows another Example of the pin which can be attached or detached to the SDS plus type shank of this invention 図1に示されたSDSプラス型シャンクに、図2で示されたピンを装着した状態を示す見取り図FIG. 2 is a sketch showing a state in which the pin shown in FIG. 2 is attached to the SDS plus type shank shown in FIG. 図1に示されたSDSプラス型シャンクの断面図Cross-sectional view of the SDS plus shank shown in FIG. 図4の、SDSプラス型シャンクにピンが装着されたシャンク部の断面図FIG. 4 is a cross-sectional view of the shank portion of the SDS plus type shank with a pin attached thereto. SDSプラス型シャンクをもつコンクリート用ドリルのひとつの例を示す図Diagram showing one example of a concrete drill with SDS plus shank SDSプラス型シャンクをもつコアドリルのひとつの例を示す図The figure which shows one example of the core drill which has the SDS plus type shank 従来のSDSプラス型シャンクの見取り図A sketch of a conventional SDS plus shank 図9のSDSプラス型シャンクの断面図Cross-sectional view of the SDS plus shank of FIG. 完全丸棒型シャンクの見取り図A sketch of a fully round bar shank 三つの平面をもつ三面丸棒型シャンクの見取り図A sketch of a three-sided round bar shank with three planes 図12のシャンクの断面図Sectional view of the shank of FIG.

本願発明に係る、着脱可能なピンと組み合わせて使用されるSDSプラス型シャンクは、一対のキー溝のひとつの溝から左右に120度ずれた位置に平面が加工されているが、その他の部分は、従来のSDSプラス型シャンクと同じで、従って製造方法も従来とほぼ同じである。  The SDS plus type shank used in combination with the detachable pin according to the present invention has a plane machined at a position shifted 120 degrees left and right from one groove of a pair of key grooves, It is the same as the conventional SDS plus type shank, and therefore the manufacturing method is almost the same as the conventional one.

シャンクに平面を加工するので、円形溝の一部は削り取られることになるが、削り取られる量がわずかなので、SDSプラス型チャックに内蔵された鋼球がシャンクを安定して把持できる溝深さが残り、SDSプラス型チャックに装着して使用しても把持特性には全く問題はない。また、キー溝は従来と同じ形状を維持しているので、回転伝達性能も劣化しない。  Since a flat surface is machined into the shank, a part of the circular groove is scraped off, but the amount of scraping is small, so that the steel ball built in the SDS plus type chuck has a groove depth that can stably grip the shank. The remaining gripping characteristics do not pose any problems even if they are mounted on the SDS plus type chuck. Moreover, since the keyway maintains the same shape as before, the rotation transmission performance is not deteriorated.

このシャンクと、キー溝に着脱可能でキー溝断面とほぼ同じ台形をしたピンとを組み合わせて使うと、ピンと、シャンクに予め加工された2つの平面で、合計三つの平面が構成されることになり、三つ爪チャックに装着した時、平面と爪が当接して穿孔工具がしっかり把持されるので、電動工具の回転トルクは確実に穿孔工具に伝達される。一旦、三つ爪型チャックで把持されると、ピンは穿孔振動などで抜け落ちることが無いため、単純な構造のピンでも実用可能で、従って、ピンの製造コストは穿孔工具の製造コストと比べれば微小である。  If this shank is used in combination with a pin that can be attached to and detached from the keyway and has a trapezoidal shape that is substantially the same as the cross section of the keyway, a total of three planes will be composed of the pin and two planes that have been pre-processed on the shank When mounted on the three-jaw chuck, the flat tool and the pawl come into contact with each other and the drilling tool is firmly held, so that the rotational torque of the electric tool is reliably transmitted to the drilling tool. Once gripped with a three-claw chuck, the pin does not fall off due to drilling vibration, etc., so a pin with a simple structure is also practical, so the manufacturing cost of the pin compared to the manufacturing cost of the drilling tool It is minute.

図1から図6を用いて、本願発明に係るSDSプラス型シャンクと、このシャンクに着脱可能なピンの実施例を説明する。
本願発明のSDSプラス型シャンク1は、図1に示すように、従来型のSDSプラス型シャンクの円周部6に平面2をもつことが特徴である。断面を図5に示すが、平面2は、一対のキー溝4のうち、片方のキー溝から左右に120度ずれた位置に合計で2ヶ所設けられていて、その加工深さは、円形溝3の形状に大きな変化が生じない範囲に抑えられている。
An embodiment of an SDS plus type shank according to the present invention and a pin that can be attached to and detached from the shank will be described with reference to FIGS.
As shown in FIG. 1, the SDS plus type shank 1 of the present invention is characterized by having a plane 2 on the circumferential portion 6 of the conventional SDS plus type shank. Although the cross section is shown in FIG. 5, the plane 2 is provided at a total of two positions at positions shifted by 120 degrees to the left and right from one of the key grooves 4, and the processing depth is a circular groove. 3 is limited to a range in which no significant change occurs in the shape of 3.

このSDSプラス型シャンク1に着脱可能なコ形ピン7を図2に示す。形が片仮名の「コ」の字と似ていて、SDSプラス型シャンク1の一対のキー溝4にしっかり嵌りこむ2本の台形爪8を持っている。  A U-shaped pin 7 which can be attached to and detached from the SDS plus type shank 1 is shown in FIG. The shape is similar to the letter “K” in Katakana, and it has two trapezoidal claws 8 that fit firmly into the pair of key grooves 4 of the SDS plus type shank 1.

このコ形ピン7を本願発明の図1のSDSプラス型シャンク1にはめ込んだ状態を図4に、その断面を図6に示す。図6で判るように、一対のキー溝4には台形爪8が嵌りこんでいて、片側の台形爪4から左右に120度ずれた位置に2つの平面2が配置されている。  FIG. 4 shows a state where the U-shaped pin 7 is fitted in the SDS plus type shank 1 of FIG. 1 of the present invention, and FIG. As can be seen in FIG. 6, a trapezoidal claw 8 is fitted into the pair of key grooves 4, and two planes 2 are arranged at positions shifted from the trapezoidal claw 4 on one side by 120 degrees to the left and right.

本願発明の図1に示される、着脱可能なピンが付いていないSDSプラス型シャンク1は、円周部6に2つの平面2が加工されてはいるものの、2つの円形溝3は、まだ十分、円形を維持している上に、2つのキー溝4は平面2と重ならないため、SDSプラス型チャックの電動工具に装着して使用しても、平面2がない従来のSDSプラス型シャンクと同等の把持特性と回転トルク伝達特性が維持され、穿孔作業では全く問題が生じない。  In the SDS plus type shank 1 shown in FIG. 1 of the present invention without a detachable pin, the two circular grooves 3 are still sufficient although the two planes 2 are processed in the circumferential portion 6. In addition, since the two key grooves 4 do not overlap with the plane 2 while maintaining a circular shape, even if it is mounted on an electric tool of an SDS plus type chuck and used, the conventional SDS plus type shank without the plane 2 Equivalent gripping characteristics and rotational torque transmission characteristics are maintained, and no problems occur in drilling operations.

三つ爪型チャックの電動工具で穿孔する必要がある時は、図2のコ形ピン7を二つのキー溝4に挿入して、図4のようにピン7とSDSプラス型シャンク1を一体化してから、三つ爪型チャックの爪と、シャンク1の2つの平面2と台形爪8の位置が合うようにして挿入し把持すれば、三つ爪型チャックの電動工具でも穿孔が可能である。  When it is necessary to drill with a three-jaw chuck electric tool, the U-shaped pin 7 of FIG. 2 is inserted into the two key grooves 4, and the pin 7 and the SDS plus type shank 1 are integrated as shown in FIG. If the nail of the three-jaw chuck is inserted and gripped so that the two claws of the three-jaw chuck and the two planes 2 of the shank 1 and the trapezoidal nails 8 are aligned, drilling is possible even with the electric tool of the three-jaw chuck. is there.

なお、着脱可能なピンとして、図3に示すように、断面がSDSプラス型シャンク1のキー溝4の断面と同じ、棒状の、いわゆる台形ピン9を使ってもよい。チャックに装着する時に落としてしまうこともありえるので、台形ピン9を磁化するか、台形ピン9の一部に小さな磁石を固着しておくと、磁力でシャンクとピンが一体化するので、ドリル着脱時にピンが脱落しづらくなり、作業性が向上する。  As a detachable pin, as shown in FIG. 3, a so-called trapezoidal pin 9 having the same cross section as that of the key groove 4 of the SDS plus type shank 1 may be used. Since it may drop when attached to the chuck, if the trapezoidal pin 9 is magnetized or a small magnet is fixed to a part of the trapezoidal pin 9, the shank and the pin are integrated by magnetic force, so the drill can be attached and detached Sometimes it becomes difficult for the pins to fall off, improving workability.

また、図2のコ形ピンで、2つの台形爪8の一方または両方の先端部を内側に折り曲げた構造とし、シャンクには、この折り曲げに対応する位置に小さな窪みを加工しておくと、コ形ピンをキー溝に差し込んだ時、ピンの折り曲げ部がシャンクの窪みにはまり込むので、コ形ピンとシャンクとの組み合わせが安定し、三つ爪型チャックの電動工具に着脱する時の作業が容易になる上に、工具箱などで保管している際にピンを紛失してしまう、といった問題も起きづらい。  In addition, with the U-shaped pin of FIG. 2, one or both tip portions of the two trapezoidal claws 8 are bent inward, and the shank is processed with a small depression at a position corresponding to this bending. When the U-shaped pin is inserted into the keyway, the bent part of the pin fits into the recess of the shank, so the combination of the U-shaped pin and the shank is stable, and the work for attaching and detaching to the electric tool of the three-claw chuck In addition to being easy, problems such as losing pins when stored in a tool box or the like are less likely to occur.

1 SDSプラス型シャンク
2 平面
3 円形溝
4 キー溝
5 シャンク端面
6 円周部
7 コ形ピン
8 台形爪
9 台形ピン
10 コンクリートドリル
11 刃先部
12 コアドリル
13 完全丸棒型シャンク
14 三面丸棒型シャンク
DESCRIPTION OF SYMBOLS 1 SDS plus type shank 2 Plane 3 Circular groove 4 Key groove 5 Shank end surface 6 Circumferential part 7 U-shaped pin 8 Trapezoidal claw 9 Trapezoidal pin 10 Concrete drill 11 Cutting edge 12 Core drill 13 Full round bar type shank 14 Three side round bar type shank

Claims (1)

シャンクに加工された一対のキー溝の少なくとも一方の溝に着脱可能なピンと、前記のピンが装着されるキー溝から左右に120度ずれた位置に平面をもつ、SDSプラス型シャンクAn SDS-plus-type shank having a pin that can be attached to and detached from at least one of a pair of key grooves processed into a shank, and a plane that is shifted 120 degrees to the left and right from the key groove on which the pin is mounted.
JP2013273914A 2013-12-27 2013-12-27 SDS plus shank Active JP6270122B2 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2802047B2 (en) * 1995-04-17 1998-09-21 株式会社イケダ Drilling tools
JP2834422B2 (en) * 1995-04-17 1998-12-09 株式会社イケダ Drilling tools
JP2986394B2 (en) * 1995-12-28 1999-12-06 株式会社イケダ Drilling tool

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