JP2007136643A

JP2007136643A - Core drill

Info

Publication number: JP2007136643A
Application number: JP2005337549A
Authority: JP
Inventors: Masaaki Miyanaga; 昌明宮永
Original assignee: Miyanaga KK
Current assignee: Miyanaga KK
Priority date: 2005-11-22
Filing date: 2005-11-22
Publication date: 2007-06-07

Abstract

PROBLEM TO BE SOLVED: To provide a core drill capable of extending the axial length corresponding to the depth of the hole to be bored. SOLUTION: The core drill includes a blade body 1 equipped with a cylindrical drum 1A, a blade 1B formed at its forefront, and an engagement part 1C formed at the base end of the drum 1A, a drive shaft side attaching part 2 equipped with a cylindrical drum 2A, a part to be engaged 2B formed at its forefront for making engagement with engagement parts 1C and 3C, and an attaching part 2R to be attached to the drive shaft side of a rotary tool formed at the base end of the drum 2A, and at least one extension cylinder part 3 to be put in service selectively equipped with a cylindrical drum 3A, a part to be engaged 3B formed at its forefront and able to be engaged with the engagement part 1C, and the engagement part 3C formed at the base end of the drum 3A and able to be engaged with the part to be engaged 2B, wherein the drive shaft side attaching part 2 is coupled with the base end of the blade body 1 directly or through the extension cylinder part 3 in such a way as complying with the depth of the hole to be bored. COPYRIGHT: (C)2007,JPO&INPIT

Description

本願発明は、コアドリルに関し、特に、１本のコアドリルでもって種々の求められる穿設深さに合わせて軸長を変化させて対応することができるコアドリルに関する。 The present invention relates to a core drill, and more particularly to a core drill that can be handled by changing the axial length according to various required drilling depths with a single core drill.

コアドリルは、穿設効率の良さから、また円形穴の形状の良さから、種々の穿設作業に用いられている。例えば、エアーコンディショナーの配管用の貫通穴を建屋の壁等に穿設する場合や、コンクリートが打設された土間（床部）を貫通するように排水管を後から配設するような場合、あるいは金属部材に貫通穴を穿設するような場合等に用いられる。 The core drill is used for various drilling operations because of its good drilling efficiency and good circular hole shape. For example, when drilling through holes for piping of air conditioners in the walls of buildings, etc., or when arranging drainage pipes so as to penetrate the soil (floor) where concrete is placed, Alternatively, it is used when a through hole is formed in a metal member.

このようなコアドリルは、先端に刃部と、基端に電動ドリル等の回転駆動工具に取着するための取着部と、前記先端と基端との間を一体に連結・形成する円筒状の胴部とを備えている（特許文献１参照）。そして、前記刃部は、穿設しようとする対象物によって、異なった材質のものが用いられ、例えば、コンクリートや石材用等の刃部にはダイヤモンド粒を配設した刃体を備えたものが使用され、また、金属用等の刃部には超硬合金製のチップからなる刃体を備えたものが使用され、また、木材用等の刃部には工具鋼や高速度鋼のチップからなる刃体を備えたものが使用されている。 Such a core drill has a cylindrical shape in which a blade portion is attached to the distal end, an attachment portion for attaching a rotary drive tool such as an electric drill to the proximal end, and the distal end and the proximal end are integrally connected and formed. (Refer to patent document 1). The blade portion is made of a different material depending on the object to be drilled. For example, the blade portion for concrete or stone is provided with a blade body provided with diamond grains. Used for metal blades, etc., with blades made of cemented carbide chips, and for blades for wood, etc., from tool steel or high-speed steel chips What is equipped with a blade body is used.

また、このような穿設作業においてコアドリルを用いる場合、穿設しようとする穴径に合わせて該穴径に合致した径のものが選択されるとともに、穿設しようとする穴深さに合わせて、その穴深さに合致した軸長のコアドリルが選択される。
特開２００５−０９６０２２号公報。 Also, when using a core drill in such drilling operations, a diameter that matches the hole diameter to be drilled is selected according to the hole diameter to be drilled, and to the hole depth to be drilled. A core drill having an axial length that matches the hole depth is selected.
Japanese Patent Laying-Open No. 2005-096022.

従って、工事業者は、穿設しようとする対象物に合致するよう種々の刃体の、また、穿設しようとする穴径に合致するよう種々の径の、さらには、穿設しようとする穴深さに合致するよう種々の軸長の、各コアドリルを用意しておかなければならない。
かかる場合、工事業者は、非常に多くの種類のコアドリルを準備しておくことが強いられることになる。 Therefore, the construction contractor can use various blades to match the object to be drilled, various diameters to match the hole diameter to be drilled, and holes to be drilled. Each core drill with various axial lengths must be prepared to match the depth.
In such a case, the construction contractor is forced to prepare a very large number of types of core drills.

本願発明は、このような現況に鑑みおこなわれたもので、前記状況を多少とも改善すべく、穿設しようとする穴深さに対応して軸長を変化させる（延長する）ことができるコアドリルを提供することを目的とする。 The present invention has been made in view of such a current situation, and in order to improve the situation somewhat, a core drill capable of changing (extending) the axial length corresponding to the hole depth to be drilled. The purpose is to provide.

本発明にかかるコアドリルは、円筒状の胴部、該胴部の先端方に形成された刃部、及び前記胴部の基端方に形成された係合部とを備えた刃体部と、
円筒状の胴部、該胴部の先端方に形成され前記係合部に係合する被係合部、及び前記胴部の基端方に形成された回転工具の駆動軸側に取着するための取着部とを備えた駆動軸側取着部と、
円筒状の胴部、該胴部の先端方に形成され前記係合部に係合可能な被係合部、及び前記胴部の基端方に形成され前記駆動軸側取着部あるいは他の延設筒部の被係合部に係合可能な係合部を備え選択的に使用される少なくとも１本の延設筒部とを有し、
使用に際して、穿設しようとする穴深さに対応して、前記刃体部の基端方に前記駆動軸側取着部を直接、又は、前記延設筒部を介して連結することができるよう構成されていることを特徴とする。 A core drill according to the present invention includes a cylindrical body part, a blade part formed at the distal end of the body part, and a blade body part provided with an engagement part formed at the proximal end of the body part;
A cylindrical body, an engaged part that is formed at the distal end of the body and engages with the engaging part, and a drive shaft side of a rotary tool that is formed at the proximal end of the body. A drive shaft side mounting portion provided with a mounting portion for,
A cylindrical body portion, an engaged portion formed at the distal end of the body portion and engageable with the engaging portion, and a drive shaft side attachment portion or other portion formed at the proximal end of the body portion And having at least one extended tube portion selectively provided with an engaging portion that can be engaged with an engaged portion of the extended tube portion,
In use, the drive shaft side attaching portion can be connected directly to the proximal end of the blade body portion or via the extended tube portion in accordance with the hole depth to be drilled. It is characterized by being comprised.

また、前記コアドリルにおいて、前記刃体部と駆動軸側取着部と延設筒部の各胴部が同じ肉厚の同じ径のパイプ状の部材で構成されているとともに、
前記刃体部と前記延設筒部の各係合部の内周径が大きくなるよう加工されることによって該係合部の肉厚がその先端方に比べて薄肉に形成されており、且つ、
前記駆動軸側取着部と前記延設筒部の各被係合部の外周径が小さくなるよう加工されることによって該被係合部の肉厚がその基端方に比べて薄肉に形成されており、
前記係合部の薄肉部分と前記被係合部の薄肉部分とが係合された状態で、その係合された部分の外周面及び内周面が隣接する部分の外周面および内周面と段差のない状態に結合されると、連結された刃体部と延設筒部及び駆動軸側取着部とは全体として軸長手方向において凹凸のないストレート状のコアドリルを実現することができる。
このように構成された各コアドリルの場合、結合部分において凹凸がなく全体として外周面および内周面がストレート状となるため、従来式の１本のコアドリルと同じく、不要な穿設抵抗を生じさせることなく穿設することが可能となる。 Further, in the core drill, each blade portion of the blade body portion, the drive shaft side attaching portion, and the extending cylindrical portion is composed of a pipe-like member having the same thickness and the same diameter,
The wall thickness of the engaging portion is formed thinner than the distal end by processing so that the inner peripheral diameter of each engaging portion of the blade body portion and the extending cylindrical portion is increased, and ,
By forming the engaged portion of the drive shaft side attaching portion and the extended cylindrical portion to be smaller in outer peripheral diameter, the engaged portion is made thinner than its proximal end. Has been
In a state where the thin portion of the engaging portion and the thin portion of the engaged portion are engaged, the outer peripheral surface and inner peripheral surface of the portion where the outer peripheral surface and inner peripheral surface of the engaged portion are adjacent to each other When combined in a state without a step, the connected blade body part, the extending cylinder part, and the drive shaft side attaching part as a whole can realize a straight core drill having no irregularities in the longitudinal direction of the shaft.
In the case of each of the core drills configured as described above, since the outer peripheral surface and the inner peripheral surface are straight as a whole without any unevenness at the joint portion, an unnecessary drilling resistance is generated as in the case of one conventional core drill. Drilling can be performed without any problems.

また、前記コアドリルにおいて、前記係合部の内周面に、前記被係合部の肉厚以下の突出寸法で内径方に突出する突起が形成されるとともに、
前記被係合部の外周面に、該被係合部の肉厚以下の深さの、前記突起が係合する、被係合溝が形成されていると、確実な係合構造となる。 Further, in the core drill, on the inner peripheral surface of the engaging portion, a protrusion protruding in the inner diameter direction is formed with a protruding dimension less than the thickness of the engaged portion,
When an engaged groove that engages with the protrusion and has a depth less than the thickness of the engaged portion is formed on the outer peripheral surface of the engaged portion, a reliable engagement structure is obtained.

また、前記コアドリルにおいて、前記被係合部の外周面に、前記係合部の肉厚以下の突出寸法で外径方に突出する突起形成されるとともに、
前記係合部の内周面に、該係合部の肉厚以下の深さの、前記突起が係合する、被係合溝が形成されていると、確実な係合構造となる。 Further, in the core drill, on the outer peripheral surface of the engaged portion, a protrusion protruding outward is formed with a protruding dimension less than the thickness of the engaging portion,
A reliable engagement structure is obtained when an engagement groove in which the projection engages with a depth equal to or less than the thickness of the engagement portion is formed on the inner peripheral surface of the engagement portion.

また、前記コアドリルにおいて、前記刃体部と駆動軸側取着部と延設筒部の各胴部が同じ肉厚の同じ径のパイプ状の部材で構成されているとともに、
前記刃体部と前記延設筒部の各係合部の外周径が小さくなるよう加工されることによって該係合部の肉厚がその先端方に比べて薄肉に形成されており、且つ、
前記駆動軸側取着部と前記延設筒部の各被係合部の内周径が大きくなるよう加工されることによって該被係合部の肉厚がその基端方に比べて薄肉に形成されており、
前記係合部の薄肉部分と前記被係合部の薄肉部分とが係合された状態で、その係合された部分の外周面及び内周面が隣接する部分の外周面及び内周面と段差のない状態に結合されることによっても、連結された刃体部と延設筒部及び駆動軸側取着部とは全体として軸長手方向において凹凸のないストレート状のコアドリルを実現することができる。
このように構成された各コアドリルの場合、結合部分において凹凸がなく全体として外周面および内周面がストレート状となるため、従来式の１本のコアドリルと同じく、不要な穿設抵抗を生じさせることなく穿設することが可能となる。 Further, in the core drill, each blade portion of the blade body portion, the drive shaft side attaching portion, and the extending cylindrical portion is composed of a pipe-like member having the same thickness and the same diameter,
The wall thickness of the engaging portion is formed thinner than the distal end by processing so that the outer peripheral diameter of each engaging portion of the blade body portion and the extending cylindrical portion is smaller, and
The thickness of the engaged portion is made thinner than the base end by processing the inner peripheral diameter of each engaged portion of the drive shaft side attaching portion and the extending cylindrical portion. Formed,
In a state where the thin portion of the engaging portion and the thin portion of the engaged portion are engaged, the outer peripheral surface and inner peripheral surface of the portion where the outer peripheral surface and inner peripheral surface of the engaged portion are adjacent to each other Even when coupled in a state where there is no step, the connected blade body part, the extending cylinder part, and the drive shaft side attaching part as a whole can realize a straight core drill having no irregularities in the longitudinal direction of the shaft. it can.
In the case of each of the core drills configured as described above, since the outer peripheral surface and the inner peripheral surface are straight as a whole without any unevenness at the joint portion, an unnecessary drilling resistance is generated as in the case of one conventional core drill. Drilling can be performed without any problems.

さらに、前記コアドリルにおいて、前記係合部の外周面に、前記被係合部の肉厚以下の突出寸法で外径方に突出する突起が形成されるとともに、
前記被係合部の内周面に、該被係合部の肉厚以下の深さの、前記突起が係合する、被係合溝が形成されていると、確実な係合構造となる。 Furthermore, in the core drill, a protrusion protruding outward is formed on the outer peripheral surface of the engaging portion with a protruding dimension less than the thickness of the engaged portion,
When an engaged groove is formed on the inner peripheral surface of the engaged portion, the depth of the engaged portion being equal to or less than the thickness of the engaged portion and engaging the projection, a reliable engagement structure is obtained. .

また、前記コアドリルにおいて、前記被係合部の内周面に、前記係合部の肉厚以下の突出寸法で内径方に突出する突起が形成されるとともに、
前記係合部の外周面に、該係合部の肉厚以下の深さの、前記突起が係合する、被係合溝が形成されていると、確実な係合構造となる。 Further, in the core drill, on the inner peripheral surface of the engaged portion, a protrusion protruding in the inner diameter direction is formed with a protruding dimension less than the thickness of the engaging portion,
A reliable engagement structure is obtained when the outer peripheral surface of the engagement portion is formed with an engaged groove with a depth equal to or less than the thickness of the engagement portion and engaged with the protrusion.

また、前記コアドリルにおいて、前記突起が周面に直交する方向から見て円形の突起によって構成されるとともに、前記被係合溝の一端が被係合部の先端面に解放され、且つ、該被係合溝が周面に直交する方向から見て、Ｔ字の下端が該被係合溝の一端になるような、略Ｔ字形の溝によって該被係合溝が構成されていると、係合部と被係合部との結合が簡単に且つ円滑に実施できるとともに、穿設時の駆動トルクやコアドリルを引き抜く時に逆方向に回転させても、係合部と被係合部の結合が強固な状態を維持できる構成となる。 Further, in the core drill, the protrusion is constituted by a circular protrusion when viewed from a direction orthogonal to the peripheral surface, and one end of the engaged groove is released to the distal end surface of the engaged portion, and the covered drill is formed. When the engaged groove is constituted by a substantially T-shaped groove such that the lower end of the T-shape is one end of the engaged groove when viewed from the direction orthogonal to the circumferential surface, The coupling between the mating part and the engaged part can be performed easily and smoothly, and the coupling between the engaging part and the engaged part can be achieved even if the driving torque during drilling or the core drill is rotated in the reverse direction. It becomes the structure which can maintain a strong state.

また、前記コアドリルにおいて、前記刃体部が、穿設しよとする対象物に適した切刃を備えた複数の刃体部のうちのいずれか１の刃体部であると、穿設しようとする対象物に合わせて、該刃体部のみそれに適した切刃を具備した刃体部に適宜交換すれば、複数の対象物に対して、前記駆動軸側取着部や延設筒部をそのまま利用して穿設することができる。従って、複合材からなる壁面等、例えば、表面がタイルでその下層に鉄板が、さらに下層に木材が使用されているような壁面に対しても、刃体部のみ交換すれば、なんなく穿設することが可能となる。 Further, in the core drill, when the blade body portion is any one of a plurality of blade body portions provided with a cutting blade suitable for an object to be drilled, the core drill is to be drilled. In accordance with the object to be used, if only the blade body part is appropriately replaced with a blade body part equipped with a cutting blade suitable for the blade body part, the drive shaft side attaching part and the extending cylinder part are provided for a plurality of objects. Can be drilled using as it is. Therefore, even if a wall surface made of a composite material, for example, a wall surface in which the surface is a tile and an iron plate is used in the lower layer and wood is used in the lower layer, only the blade part is replaced, it is drilled without any problem. It becomes possible.

しかして、本発明にかかるコアドリルによれば、切削に寄与する刃体部と、回転工具の駆動軸側に取着する駆動軸側取着部と、穿設しようとする穴深さに合わせて選択的に使用する少なくとも１本の延設筒部とから構成することによって、穴深さが浅い場合には、前記延設筒部を使用することなく、前記刃体部の係合部を駆動軸側取着部の被係合部に係合させることによって、軸長が短くなったコアドリルによって穿設することができ、また、穴深さの深い穴を穿設する場合には、前記刃体部と駆動軸側取着部を、その深さに合わせて１本あるいは適宜数の延設筒部を介して連結することによって、穴深さに合致した軸長を有するコアドリルとして、深い穴を穿設することが可能となる。そして、前記刃体部と延設筒部と駆動軸側取着部の連結は、刃体部の係合部を延設筒部の被係合部に係合し、該延設筒部の係合部を駆動軸側取着部の被係合部に係合することによって、１本のコアドリルとすることが可能となる。 Thus, according to the core drill according to the present invention, the blade body part contributing to cutting, the drive shaft side attaching part attached to the drive shaft side of the rotary tool, and the hole depth to be drilled are matched. When the hole depth is shallow, the engaging portion of the blade body portion is driven without using the extending cylinder portion when the hole depth is shallow. By engaging with the engaged portion of the shaft side attachment portion, it can be drilled by a core drill having a reduced shaft length, and when drilling a hole having a deep hole depth, the blade A deep hole is formed as a core drill having an axial length that matches the hole depth by connecting the body part and the drive shaft side attachment part via one or an appropriate number of extending tube parts according to the depth. Can be drilled. And the connection of the said blade body part, the extension cylinder part, and the drive-shaft side attaching part engages the engaging part of a blade body part with the to-be-engaged part of an extension cylinder part, By engaging the engaging portion with the engaged portion of the drive shaft side attaching portion, it is possible to obtain a single core drill.

従って、工事業者等は、同じ径については、軸長の異なるコアドリルを種々準備しておかなければならないような状況から解放される。 Therefore, the contractor and the like are freed from the situation where various core drills having different axial lengths must be prepared for the same diameter.

（実施例１）
以下、本発明にかかるコアドリルの実施例について図面を参照しながら具体的に説明する。 Example 1
Hereinafter, embodiments of the core drill according to the present invention will be specifically described with reference to the drawings.

図１は本発明の一実施例にかかるコアドリルの全体の概略の構成を一部断面し且つ各構成を組立前の状態で示した全体の分解側面図である。 FIG. 1 is an exploded side view of the entire core drill according to an embodiment of the present invention, partly in cross section and showing each component in a state before assembly.

図１に図示するように、本実施例にかかるコアドリルＡは、先端（図１において下端）に配設され切削をおこなう刃体部１と、基端（図１において上端）に配設され回転工具の駆動軸側に取着するための駆動軸側取着部２と、前記刃体部１と駆動軸側取着部２との間に穿設しようとする穴深さに合わせて選択的に１本あるいは適宜本数使用される延設筒部３と、穿設開始時に取着され位置決め完了後取り外される位置決め用のセンターピン４とを有する。 As shown in FIG. 1, a core drill A according to the present embodiment is disposed at a distal end (lower end in FIG. 1) to perform cutting, and a base end (upper end in FIG. 1) is disposed and rotated. Selectable according to the drive shaft side mounting portion 2 for mounting on the drive shaft side of the tool, and the hole depth to be drilled between the blade body portion 1 and the drive shaft side mounting portion 2 The extension cylinder part 3 is used at one or an appropriate number, and the positioning center pin 4 is attached at the start of drilling and removed after the positioning is completed.

前記刃体部１は、中心線より右方を断面して内部の構成を拡大して示す図２に図示するように、円筒状の胴部１Ａと、該胴部の先端方（図２において下端方）に形成された刃部１Ｂと、前記胴部１Ａの基端方（図２において上端方）に形成された係合部１Ｃとを備えている。前記刃部１Ｂの先端部には、この実施例では、ダイヤモンド粒を焼結したブロック状の切刃１ａが、周方向において適宜間隔をもって複数個（この実施形態では８個）配設されている。そして、この切刃１ａの内周端１ｅは、前記胴部１Ａの内周面より内径方に位置し、且つ、この切刃１ａの外周端１ｆは、前記胴部１Ａの外周面より外径方に位置して、穿設時に切刃１ａにより効率よく穿設できるよう構成されている。
そして、この実施例にかかるコアドリルＡでは、前記延設筒部３を適宜本数だけ使用して所望の軸長Ｌ（図８参照）にできるため、前記胴部１Ａは、刃体部１を短くするべく、極めて短い寸法に形成されている。つまり、穿設しようとする穴深さが浅い場合に適切に対応できる軸長のコアドリルにできるように配慮されている。
また、前記係合部１Ｃは、その内周面１ｒが切削加工されることによって薄肉に形成されており、この内周面の係合部１Ｃと前記胴部１Ａの境界には、段差部１ｄが形成されている。前記切削加工の切削される厚みは、前記胴部１Ａの肉厚の約６０％程度である。つまり、この実施例では、前記係合部１Ｃの肉厚は胴部１Ａの肉厚の約４０％程度となっている。
そして、前記係合部１Ｃの内周面には、内周方に突出した突起５が形成されている。この突起５は、この実施例では、外径方から内径方に向けてプレスされることによって形成され、従って、図１あるいは図２に図示するように、該突起５の外周面側には該突起５の凹みが形成されている。しかし、この突起５は、プレス加工以外の他の加工、例えば、切削加工又は鋳造加工等によって形成してもよいことは言うまでもない。また、前記係合部１Ｃの薄肉部分をも、切削加工以外の他の加工、例えば、切削加工又は鋳造加工等によって形成してもよいことは言うまでもない。
そして、この突起５の内径方への突出寸法は、前記内周面１ｒが切削加工により削り取られた厚みよりやや小さい寸法となっている。つまり、突起５の内径方への突出寸法は、後述する延設筒部３あるいは駆動軸側取着部２の被係合溝６の溝深さに対応した寸法となっている。 As shown in FIG. 2, which shows the internal structure by enlarging the internal structure by cutting rightward from the center line, the blade body portion 1 has a cylindrical body portion 1A and a distal end of the body portion (in FIG. 2). A blade portion 1B formed on the lower end side and an engagement portion 1C formed on the base end side (upper end direction in FIG. 2) of the body portion 1A are provided. In this embodiment, a plurality of (8 in this embodiment) block-shaped cutting blades 1a sintered with diamond grains are disposed at the tip of the blade portion 1B at appropriate intervals in the circumferential direction. . And the inner peripheral end 1e of this cutting blade 1a is located in an inner diameter side from the inner peripheral surface of the said trunk | drum 1A, and the outer peripheral end 1f of this cutting blade 1a is outer diameter from the outer peripheral surface of the said trunk | drum 1A. It is located in the direction and is configured so that it can be efficiently drilled by the cutting blade 1a when drilling.
And in the core drill A concerning this Example, since the said extending cylinder part 3 can be used by the appropriate number, it can be made the desired axial length L (refer FIG. 8), Therefore The said trunk | drum 1A makes the blade body part 1 short. Therefore, it is formed in a very short dimension. In other words, consideration is given so that a core drill having an axial length that can be appropriately handled when the hole depth to be drilled is shallow.
The engaging portion 1C is formed thin by cutting the inner peripheral surface 1r, and a step portion 1d is formed at the boundary between the engaging portion 1C on the inner peripheral surface and the trunk portion 1A. Is formed. The thickness cut by the cutting process is about 60% of the thickness of the body portion 1A. That is, in this embodiment, the thickness of the engaging portion 1C is about 40% of the thickness of the trunk portion 1A.
And the protrusion 5 which protruded to the inner peripheral direction is formed in the inner peripheral surface of the said engaging part 1C. In this embodiment, the protrusion 5 is formed by pressing from the outer diameter side toward the inner diameter direction. Therefore, as shown in FIG. 1 or FIG. A recess of the protrusion 5 is formed. However, it goes without saying that the protrusion 5 may be formed by a process other than the press process, such as a cutting process or a casting process. Needless to say, the thin portion of the engaging portion 1C may be formed by processing other than cutting, for example, cutting or casting.
And the protrusion dimension to the internal diameter direction of this protrusion 5 is a dimension slightly smaller than the thickness by which the said inner peripheral surface 1r was scraped off by cutting. That is, the protrusion dimension of the protrusion 5 toward the inner diameter is a dimension corresponding to the groove depth of the extended groove portion 3 or the engaged groove 6 of the drive shaft side attaching portion 2 described later.

前記延設筒部３は、図２あるいは図３に図示するように、円筒状の胴部３Ａと、該胴部３Ａの先端方（図２，図３において下方）に形成され前記刃体部１の係合部１Ｃに係合する被係合部３Ｂと、図３に示す、該胴部３Ａの基端方（図２，図３において上方）に形成された係合部３Ｃとを有する。
前記胴部３Ａは、前記刃体部１の胴部１Ａと同じ外径と内径を有している。
前記被係合部３Ｂは、その外周面３ｇが切削加工されることによって薄肉に形成されており、この外周面の被係合部３Ｂと前記胴部３Ａの境界には、段差部３ｄが形成されている。前記切削加工の切削厚みは、前記胴部３Ａの肉厚の約４０％程度である。つまり、この実施例では、前記被係合部３Ｂの肉厚は胴部３Ａの肉厚の約６０％程度となっている。
また、前記被係合部３Ｂの外周面には、内径方に凹んだ有底の前記被係合溝６が形成されている。この被係合溝６は、この実施例では、外周面を切削加工あるいは研削加工することによって形成されている。しかし、この被係合溝６は、切削加工あるいは研削加工以外の他の加工、例えば、鋳造加工等によって形成してもよいことは言うまでもない。そして、この被係合溝６の内径方への凹み寸法（溝深さ）は、この被係合部３Ｂの肉厚より小さい寸法となっている。そして、この被係合溝６の深さは、前記突起５の内径方への突出寸法に対応した寸法、つまり、略等しい寸法（正確には、該突起５の内径方への突出寸法よりやや大きい寸法）となっている。
また、図２に図示するように、この被係合部３Ｂの軸長手方向（軸長方向）の寸法Ｌｂは、前記刃体部１の係合部１Ｃの軸方向の寸法Ｌａに等しく（正確にはやや小さく寸法）に構成されている。
また、前記胴部３Ａの基端方に形成されている前記係合部３Ｃは、前記刃体部１の係合部１Ｃと寸法的に且つ形態的に全く同じに構成されている。この係合部３Ｃの前記係合部１Ｃと同じ（あるいは対応する）構成については、同じ参照符号を付して、あるいは符号の「１」部分を「３」に代えた参照符号を付して、その説明を省略する。 As shown in FIG. 2 or FIG. 3, the extended tube portion 3 is formed on a cylindrical body portion 3A and the end of the body portion 3A (downward in FIGS. 2 and 3). 3B to be engaged with one engaging portion 1C, and an engaging portion 3C formed on the proximal end (upward in FIGS. 2 and 3) of the trunk portion 3A shown in FIG. .
The barrel portion 3A has the same outer diameter and inner diameter as the barrel portion 1A of the blade body portion 1.
The engaged portion 3B is formed thin by cutting the outer peripheral surface 3g thereof, and a step portion 3d is formed at the boundary between the engaged portion 3B and the body portion 3A on the outer peripheral surface. Has been. The cutting thickness of the cutting process is about 40% of the thickness of the body portion 3A. That is, in this embodiment, the thickness of the engaged portion 3B is about 60% of the thickness of the trunk portion 3A.
Further, the engaged groove 6 having a bottom that is recessed toward the inner diameter is formed on the outer peripheral surface of the engaged portion 3B. In this embodiment, the engaged groove 6 is formed by cutting or grinding the outer peripheral surface. However, it goes without saying that the engaged groove 6 may be formed by processing other than cutting or grinding, for example, casting. The recessed dimension (groove depth) of the engaged groove 6 toward the inner diameter is smaller than the thickness of the engaged part 3B. The depth of the engaged groove 6 is a dimension corresponding to the protrusion dimension of the protrusion 5 toward the inner diameter, that is, a substantially equal dimension (more precisely, a protrusion dimension of the protrusion 5 toward the inner diameter). Large dimensions).
As shown in FIG. 2, the dimension Lb in the axial longitudinal direction (axial length direction) of the engaged part 3B is equal to the axial dimension La of the engaging part 1C of the blade body part 1 (accurately). (Slightly smaller dimensions).
Further, the engaging portion 3C formed on the proximal end side of the body portion 3A is configured in exactly the same dimension and form as the engaging portion 1C of the blade body portion 1. The same (or corresponding) configuration of the engaging portion 3C as that of the engaging portion 1C is given the same reference numeral, or a reference numeral in which the “1” portion of the reference numeral is replaced with “3”. The description is omitted.

前記駆動軸側取着部２は、図３に図示するように、円筒状の胴部２Ａと、該胴部２Ａの先端方（図２において下方）に形成され前記係合部１Ｃ（あるいは係合部３Ｃ）に係合する被係合部２Ｂと、前記胴部２Ａの基端方（図２において上方）に形成された回転工具１０（図８（ａ）参照）の駆動軸側に取着するための取着部２Ｅとを有する。
前記胴部２Ａは、前記刃体部１の胴部１Ａおよび延設筒部３の胴部３Ａと同じ外径と内径を有している。
前記被係合部２Ｂは、前記延設筒部３の被係合部３Ｂと全く同じ構成に構成されている。
従って、前記被係合部２Ｂの前記被係合部３Ｂと同じ（あるいは対応する）構成）については、同じ参照符号を付して、あるいは符号の「３」部分を「２」に代えた参照符号を付して、その説明を省略する。
前記取着部２Ｅは、回転工具の駆動軸側（この実施例の場合、取着用アタッチメント８：図１，図４参照）に着脱自在になるように、該取着用アタッチメント８の外径に等しい内径を有する縮径部２Ｓと、この縮径部２Ｓに形成された係合部（この実施例では「「半球状の凹部」）２Ｒとを有する。従って、前記胴部２Ａとこの取着部２Ｅの境界部分にはラウンド状になった段部９が形成されている。前記縮径部２Ｓは、この実施例の場合には、フォーミング加工によって形成されている。しかし、フォーミング加工以外の他の加工方法、例えばプレス加工等によって形成されてもよいことは言うまでもない。 As shown in FIG. 3, the drive shaft side attaching portion 2 is formed at a cylindrical barrel portion 2A and the distal end (downward in FIG. 2) of the barrel portion 2A. The engaged portion 2B that engages with the joint portion 3C) and the rotary tool 10 (see FIG. 8A) formed on the base end side (upward in FIG. 2) of the body portion 2A are attached to the drive shaft side. It has attachment part 2E for wearing.
The body portion 2A has the same outer diameter and inner diameter as the body portion 1A of the blade body portion 1 and the body portion 3A of the extended cylinder portion 3.
The engaged portion 2B is configured in exactly the same configuration as the engaged portion 3B of the extended tube portion 3.
Therefore, for the engaged portion 2B, the same (or corresponding) configuration as the engaged portion 3B is given the same reference numeral, or the reference numeral “3” is replaced with “2”. Reference numerals are assigned and explanations thereof are omitted.
The attachment portion 2E is equal to the outer diameter of the attachment attachment 8 so as to be detachable on the drive shaft side of the rotary tool (in this embodiment, the attachment attachment 8: see FIGS. 1 and 4). It has a reduced diameter portion 2S having an inner diameter, and an engaging portion (in this embodiment, ““ hemispherical recess ”) 2R formed in the reduced diameter portion 2S. Therefore, a round step 9 is formed at the boundary between the body 2A and the attachment 2E. In the case of this embodiment, the reduced diameter portion 2S is formed by forming. However, it goes without saying that it may be formed by a processing method other than forming processing, for example, press processing.

そして、図４あるいは図９に図示する、前記取着用アタッチメント８の先端部（図４あるいは図９において下端部）には、前記縮径部２Ｓの内径と等しい（正確には嵌合い分だけ小さい）外径を有する取着部８Ｓが形成されており、この取着部８Ｓには、前記係合部２Ｒが係合可能な、周面に直交する方向から見ると逆Ｌ字状の係合溝８Ｄが、形成されている。また、この取着部８Ｓの基端側には、該取着部８Ｓに対して相対的に回転可能に配置されている、つまり、この取着部８Ｓが回転可能になっているのに対して、回転不能になった胴部８Ｂが設けられている。そして、この胴部８Ｂは回り止め部材８Ｌを介して回転工具１０（図８（ａ）参照）側連結されている。また、図１，図４，図８に図示するように、前記胴部８Ｂの側部（外周面）には、内部に切削液を供給可能な切削液供給口８Ｗを備えた切削液供給金具８Ｐが取着され、該切削液供給口８Ｗから胴部８Ｂ内方の通路８ｙに切削液を供給することができるよう構成されている。なお、切削液は、前記胴部８Ｂ内方の通路８ｙからこの取着用アタッチメント８の下端部の開口８Ｕへ供給することができるような構成となっている。このように固定側から回転している部位へ切削液を供給するための機構は公知のものである。なお、前記開口８Ｕは、前記センターピン４の図１に示す先端面４ｔに形成された図示しない開口に連接され、該開口を通ってその下方の外周面４ｒに形成された開口４ｕからコアドリルＡ内方に切削液を供給できるように構成されている。
そして、この取着用アタッチメント８には、前記係合溝８Ｄの周方向に延びる部分を背面側（取着用アタッチメント８の中心部分側）からバネ８ｅ（図４参照）のバネ力によって押圧するボール状の押圧部材８Ｋが配設されている。この押圧部材８Ｋを、前記駆動軸側取着部２の係合部２Ｒが、前記バネ８ｅのバネ力に打ち勝って溝に沿うように押圧されることによって乗り越え、該駆動軸側取着部２の縮径部２Ｓを取着用アタッチメント８の取着部８Ｓに挿着することができるよう構成されている。そして、挿着完了後に、前記押圧部材８Ｋが前記駆動軸側取着部２の係合部２Ｒ（図９の二点鎖線参照）を側方背面方から前記バネ力によって係止して、該係合部２Ｒを係合溝８Ｄ内に固定（係止）することができるように構成されている。また、前記係合溝８Ｄは、その上端部において、図９に図示するように、反回転方向（図９において左方向）に延設されており、コアドリルＡを逆転させて穿設穴から引き抜くときにも、この取着用アタッチメント８からコアドリルＡが外れることがないように配慮されている。しかし、コアドリルＡを逆転させて穿設穴から引き抜くときには、穿設時ほどの回転トルクが必要でないため、前述の押圧部材８Ｋをこの部分に特に設けていない。しかし、勿論、この部分にも同じ構成の押圧部材を設けておいてもよいことは言うまでもない。 4 or 9, the distal end portion (the lower end portion in FIG. 4 or 9) of the attachment 8 is equal to the inner diameter of the reduced diameter portion 2 S (exactly smaller by the amount of fitting). ) An attachment portion 8S having an outer diameter is formed, and this attachment portion 8S can be engaged with the engagement portion 2R, and has an inverted L-shape when viewed from a direction perpendicular to the circumferential surface. A groove 8D is formed. Further, on the proximal end side of the attachment portion 8S, the attachment portion 8S is disposed so as to be rotatable relative to the attachment portion 8S. That is, the attachment portion 8S is rotatable. Thus, a body portion 8B that is not rotatable is provided. And this trunk | drum 8B is connected to the rotary tool 10 (refer Fig.8 (a)) side via the rotation prevention member 8L. Further, as shown in FIGS. 1, 4 and 8, a cutting fluid supply fitting provided with a cutting fluid supply port 8W capable of supplying a cutting fluid to the inside thereof on the side portion (outer peripheral surface) of the body portion 8B. 8P is attached and it is comprised so that cutting fluid can be supplied to the channel | path 8y inside the trunk | drum 8B from this cutting fluid supply port 8W. Note that the cutting fluid can be supplied to the opening 8U at the lower end portion of the attachment 8 from the passage 8y inside the body portion 8B. The mechanism for supplying the cutting fluid to the portion rotating from the fixed side in this way is a known one. The opening 8U is connected to an opening (not shown) formed on the front end surface 4t of the center pin 4 shown in FIG. 1, and passes through the opening 4u formed on the outer peripheral surface 4r below the core drill A. The cutting fluid can be supplied inward.
The attachment attachment 8 has a ball shape in which a portion extending in the circumferential direction of the engagement groove 8D is pressed by a spring force of a spring 8e (see FIG. 4) from the back side (the central portion side of the attachment attachment 8). The pressing member 8K is disposed. The pressing member 8K is overcome by the engagement portion 2R of the drive shaft side attachment portion 2 being pressed along the groove overcoming the spring force of the spring 8e, and the drive shaft side attachment portion 2 is overcome. The reduced diameter portion 2 S can be attached to the attachment portion 8 S of the attachment 8. Then, after the insertion is completed, the pressing member 8K locks the engaging portion 2R (see the two-dot chain line in FIG. 9) of the drive shaft side attaching portion 2 from the side rear side by the spring force, The engaging portion 2R can be fixed (locked) in the engaging groove 8D. Further, as shown in FIG. 9, the engaging groove 8D is extended in the counter-rotating direction (left direction in FIG. 9) at the upper end thereof, and the core drill A is reversed and pulled out from the drilled hole. Sometimes, it is considered that the core drill A is not detached from the attachment 8. However, when the core drill A is reversed and pulled out from the drilling hole, the rotational torque as high as that at the time of drilling is not required, and thus the above-described pressing member 8K is not particularly provided at this portion. However, needless to say, a pressing member having the same configuration may be provided in this portion.

ところで、この実施例の場合、前記刃体部１の係合部１Ｃの突起５、前記延設筒部３の係合部３Ｃの突起５は、基端方から見た図６（ａ）に図示するように、周方向において３箇所、１２０度の間隔をもって配置されている。
また、前記突起５に対応する前記延設筒部３の被係合部３Ｂの被係合溝６、前記駆動軸側取着部２の被係合部２Ｂの被係合溝６は、図５（ａ）に図示するように、周方向において３箇所、１２０度の間隔をもって配置されている。
従って、前記係合部１Ｃと前記被係合部３Ｂ（あるいは被係合部２Ｂ）との結合部分、前記係合部３Ｃと前記被係合部２Ｂとの結合部分は、各係合部と被係合部との「嵌合い」および突起５と被係合溝６との係合（図７参照）によって、周方向において均等に且つ強固に係合できるような構成となっている。
しかし、前記突起５および被係合溝６は、周方向に３箇所に限定されるものでなく、２箇所であっても、４箇所であっても、あるいは１箇所又は５箇所以上であってもよい。 By the way, in the case of this embodiment, the protrusion 5 of the engaging portion 1C of the blade body portion 1 and the protrusion 5 of the engaging portion 3C of the extending cylinder portion 3 are shown in FIG. As shown in the figure, they are arranged at three locations in the circumferential direction at intervals of 120 degrees.
Further, the engaged groove 6 of the engaged portion 3B of the extended tube portion 3 corresponding to the protrusion 5 and the engaged groove 6 of the engaged portion 2B of the drive shaft side attaching portion 2 are shown in FIG. As illustrated in FIG. 5 (a), three portions are arranged at intervals of 120 degrees in the circumferential direction.
Therefore, the coupling portion between the engaging portion 1C and the engaged portion 3B (or the engaged portion 2B), and the coupling portion between the engaging portion 3C and the engaged portion 2B are each of the engaging portions. By the “fitting” with the engaged portion and the engagement between the protrusion 5 and the engaged groove 6 (see FIG. 7), the structure can be engaged uniformly and firmly in the circumferential direction.
However, the protrusion 5 and the engaged groove 6 are not limited to three places in the circumferential direction, and may be two places, four places, or one place or five places or more. Also good.

しかして、前述のように構成された本構成にかかるコアドリルは、以下のように使用することが可能となる。つまり、
穿設しようとする穴の深さに合わせて、前記刃体部１を前記駆動軸側取着部２に直接連結して所定軸長のコアドリルＡとして使用することができる。
また、より深い穴を穿設する場合には、前記刃体部１を、１本あるいは所定本数の前記延設筒部３を介して、前記駆動軸側取着部２に連結することによって、穿設しようとする穴深さに対応した軸長Ｌ（図８参照）のコアドリルＡとして使用することができる。
そして、このように連結されて適宜軸長を持ったコアドリルＡは、その連結部分は、図８に断面して示すように、外周面および内周面に段差や凹凸が形成されることなく、ストレートの状態となるため、物理的に１本に形成された従来のコアドリルと同じように、無用な抵抗なく、穿設することが可能となる。 Therefore, the core drill according to the present configuration configured as described above can be used as follows. That means
According to the depth of the hole to be drilled, the blade part 1 can be directly connected to the drive shaft side attaching part 2 and used as a core drill A having a predetermined axial length.
Further, in the case of drilling a deeper hole, by connecting the blade body part 1 to the drive shaft side attaching part 2 through one or a predetermined number of the extending cylinder parts 3, It can be used as a core drill A having an axial length L (see FIG. 8) corresponding to the hole depth to be drilled.
And, the core drill A that is connected in this way and has an appropriate axial length, as shown in a cross-sectional view in FIG. 8, the step and unevenness are not formed on the outer peripheral surface and the inner peripheral surface, Since it is in a straight state, it can be drilled without unnecessary resistance in the same manner as a conventional core drill that is physically formed in one piece.

そして、前述のように、前記被係合溝６が、略Ｔ字状に形成されているため、該被係合溝６と突起５との間では、連結部分で抜けるようなことなく、穿設時における回転トルク及び引き抜き時における反対方向の回転トルクも同様に伝達することができる。 As described above, since the engaged groove 6 is formed in a substantially T shape, the engagement groove 6 and the protrusion 5 are not pierced at the connecting portion without being pulled out. The rotational torque at the time of installation and the rotational torque in the opposite direction at the time of extraction can be transmitted in the same manner.

そして、前述した構成からなるコアドリルＡを用いて、被穿設対象物、例えば、コンクリートＭに穿設する場合について、図８に基づいて、概略説明すると、以下のとおりである。つまり、
図８（ａ）に図示するように、前記駆動軸側取着部２の係合部２Ｒを、取着用アタッチメント８の被係合溝８Ｄ（図４参照）に係合させることによって、コアドリルＡを前記取着用アタッチメント８に取着する。また、前記取着用アタッチメント８の先端部に形成されているシャンク部８Ｔを、電動ドリル装置等の回転工具１０のチャック１１等に取着する。また、この取着用アタッチメント８の回り止め部材８Ｌを前記回転工具１０の固定部材１０Ｌに固定して、該取着用アタッチメント８の胴部８Ｂが穿設時に回転しないように固定する。
そして、図８（ａ）に図示するように、前記取着用アタッチメント８に付設されている切削液供給口８Ｗに、基端が図示しない切削液タンク等に接続されているホース１２の先端を接続する。 The case of drilling an object to be drilled, for example, concrete M, using the core drill A having the above-described configuration is briefly described as follows based on FIG. That means
As illustrated in FIG. 8A, the core drill A is obtained by engaging the engaging portion 2 R of the drive shaft side attaching portion 2 with the engaged groove 8 D (see FIG. 4) of the attaching attachment 8. Is attached to the attachment attachment 8. Moreover, the shank part 8T formed in the front-end | tip part of the said attachment 8 is attached to the chuck | zipper 11 etc. of rotary tools 10, such as an electric drill apparatus. Further, the anti-rotation member 8L of the attachment 8 is fixed to the fixing member 10L of the rotary tool 10 so that the body portion 8B of the attachment 8 is not rotated at the time of drilling.
8A, the distal end of the hose 12 whose base end is connected to a cutting fluid tank (not shown) or the like is connected to the cutting fluid supply port 8W attached to the attachment attachment 8. To do.

そして、前記コアドリルＡの内方の中心軸部分に、位置決め用のセンターピン４を取着する。このセンターピン４のコアドリルＡ内への挿着（取着）は、該センターピン４の先端部を、前記取着用アタッチメント８の底面中心に形成されている前記下端開口８Ｕへ挿着することによっておこなわれる。なお、前記下端開口８Ｕとセンターピン４との間に軸長手方向にスパイラル状に延びる隙間（図示せず）が形成され、この隙間から切削液が下方に漏下する。 Then, a positioning center pin 4 is attached to the inner central shaft portion of the core drill A. The center pin 4 is inserted (attached) into the core drill A by inserting the tip of the center pin 4 into the lower end opening 8U formed at the center of the bottom surface of the attachment 8. It is carried out. A gap (not shown) extending spirally in the axial longitudinal direction is formed between the lower end opening 8U and the center pin 4, and the cutting fluid leaks downward from the gap.

このような状態で、前記電動ドリル装置のスイッチをＯＮにするとともに、前記切削液のホースから切削液の供給を開始する。
この結果、コンクリートＭに所定深さの環状の溝が穿設されることになる。なお、かかる穿設において、あるいは以後の穿設において、前記ホース１２から切削液（水を含む）を供給することによって、効率的に切削することができる。しかし、切削液に代えて、前記ホース１２から空気を供給するようしてもよい。このように、ホース１２からコアドリルＡ内部に切削液あるいは空気を供給すると、切刃１ａを冷却することができるとともに、穿設した穴から切削屑を外部に排出するのに寄与する。 In such a state, the switch of the electric drill device is turned on, and supply of cutting fluid from the cutting fluid hose is started.
As a result, an annular groove having a predetermined depth is formed in the concrete M. In this drilling or subsequent drilling, cutting can be efficiently performed by supplying a cutting fluid (including water) from the hose 12. However, air may be supplied from the hose 12 instead of the cutting fluid. In this way, when cutting fluid or air is supplied from the hose 12 into the core drill A, the cutting blade 1a can be cooled and contribute to discharging cutting waste from the drilled hole to the outside.

このように、前記刃体部１によって環状の溝が穿設されると、次に、前記センターピン４を下端開口８Ｕから取り外して、図８（ｂ）に図示するように、前記駆動軸側取着部２と刃体部１との間に、前記延設筒部３を配置することによって、コアドリルＡの軸長を長くして後、前記図８（ａ）の穿設と同じように、所定深さの貫通穴を穿設する。 As described above, when the annular groove is formed by the blade portion 1, the center pin 4 is removed from the lower end opening 8U, and the drive shaft side is removed as shown in FIG. 8B. After extending the axial length of the core drill A by disposing the extending cylinder portion 3 between the attachment portion 2 and the blade body portion 1, the same as the drilling shown in FIG. A through hole having a predetermined depth is drilled.

そして、このように軸長が長くなった状態においても該コアドリルＡの内周面及び外周面はストレートの状態となっているため、つまり無用な凹凸がないため、円滑な穿設が可能となる。 Even in such a state that the axial length is increased, the inner peripheral surface and the outer peripheral surface of the core drill A are in a straight state, that is, since there is no unnecessary unevenness, smooth drilling is possible. .

そして、前記延設筒部３は、１本に限られることなく、穿設しようとする穴深さに対応して、適宜本数使用して、コアドリルＡの軸長を長くすることができるため、本実施例にかかるコアドリルＡの場合、理論上、穿設可能な穴深さに制限がない。 And since the said extension cylinder part 3 is not restricted to 1 but can use the number suitably according to the hole depth which it is going to pierce, it can lengthen the axial length of the core drill A, In the case of the core drill A according to the present embodiment, the hole depth that can be drilled is theoretically unlimited.

また、前記刃体部１に代えて、金属用あるいは木工用の切刃を備えた刃体部と刃体部のみ交換することによって、つまり、同じ延設筒部３と駆動軸側取着部２を利用して、所望の深さの穴を穿設することができる。
従って、表面にタイルがその内方に鉄板がありさらにその内方に木材があるような壁を穿設するような場合にも、最初に、刃体部にタイル用の切刃を有する刃体部を取着したコアドリルＡでタイル部分を穿設し、次に刃体部を金属用の切刃を有する刃体部に交換して鉄板部分を穿設し、最後に刃体部を木工用の刃体部に交換して穿設することが可能となる。
（実施例２）
ところで、前記被係合溝６に関する別の実施形態として、図１０に図示するような被係合溝１０６に構成してもよい。つまり、
図１０に図示するように、被係合溝１０６の基端部（図１０において上端部）の、略Ｔ字形の周方向に延びる溝部分について、該溝部分の穿設時の駆動方向（図１０において左方向）における後方端部分の先端側の面１０６Ｎを、後方側で先端方へ傾斜した面（この実施例では、傾斜角が約２度）で構成してもよい。かかる構成によれば、穿設時に、この被係合溝１０６と前記突起５との間に駆動力が作用し且つ軸長手方向の押圧力が弱まったときにも、前記突起５を被係合部１０６の中央側へ移動させ難くする。従って、穿設時の駆動力が作用している状態において、軸長手方向の押圧力が弱まっても、突起５が被係合溝１０６から抜けるような事態を可及的に防止できる。なお、前記傾斜角は、この実施例では略２度に設定しているが、該２度に限定されるものでなく、他の角度であってよく、例えば、約１度であっても、あるいは２度以上、例えば、２〜約１０度程度であってもよい。
また、図１０に図示するように、被係合溝１０６の略Ｔ字形の周方向に延びる溝部分の、引き抜き時の駆動方向（図１０において右方向）における先方端部分に、先端側（図１０において下端側）に延びる凹部１０６Ｖを形成することにより、コアドリルＡを逆回転（図１０において右側に回転）させた状態で引き抜く際に、前記逆回転方向において負の加速度が作用しても、前記突起５が被係合部１０６の中央側へ移動しようとする動作を阻止する。従って、引き抜き時に駆動力が弱まった際にも、突起５が被係合溝１０６から抜けるような事態を防止できる。 Moreover, it replaces with the said blade body part 1, and it replaces only the blade body part provided with the cutting blade for metal or woodwork, and a blade body part, that is, the same extended cylinder part 3 and drive shaft side attaching part 2 can be used to drill a hole having a desired depth.
Therefore, even when a wall having a tile on its surface and a steel plate on its inner side and a wood on its inner side is drilled, the blade body having a cutting edge for tiles in the blade body portion first. Drill the tile part with the core drill A attached, then replace the blade part with a blade part with a metal cutting edge, drill the iron plate part, and finally use the blade part for woodworking It is possible to drill by exchanging with the blade part.
(Example 2)
By the way, as another embodiment related to the engaged groove 6, an engaged groove 106 as shown in FIG. That means
As shown in FIG. 10, with respect to the groove portion extending in the circumferential direction of the substantially T-shape at the base end portion (upper end portion in FIG. 10) of the engaged groove 106, the driving direction (see FIG. The surface 106N on the distal end side of the rear end portion (leftward in FIG. 10) may be configured with a surface inclined in the rearward direction toward the distal end (in this embodiment, the inclination angle is about 2 degrees). According to this configuration, when the driving force acts between the engaged groove 106 and the protrusion 5 and the pressing force in the axial longitudinal direction is weakened at the time of drilling, the protrusion 5 is engaged. It is difficult to move the unit 106 to the center side. Therefore, in the state where the driving force at the time of drilling is acting, even if the pressing force in the longitudinal direction of the shaft is weakened, it is possible to prevent as much as possible the situation in which the protrusion 5 comes out of the engaged groove 106. The inclination angle is set to approximately 2 degrees in this embodiment, but is not limited to 2 degrees, and may be another angle, for example, about 1 degree. Or it may be 2 degrees or more, for example, about 2 to about 10 degrees.
Further, as shown in FIG. 10, the front end side (see FIG. 10) of the groove portion of the engaged groove 106 extending in the circumferential direction of the substantially T shape in the driving direction at the time of extraction (right direction in FIG. 10). By forming the concave portion 106V extending to the lower end side in FIG. 10, even when negative acceleration acts in the reverse rotation direction when the core drill A is pulled out in the reverse rotation state (rotated to the right side in FIG. 10), The projection 5 is prevented from moving toward the center of the engaged portion 106. Therefore, even when the driving force is weakened at the time of pulling out, it is possible to prevent a situation in which the protrusion 5 comes out of the engaged groove 106.

その他の構成は、実施例１に記載した構成と同じであればよい。 Other configurations may be the same as those described in the first embodiment.

ところで、前記各実施例では、係合部の内周径が大きくなるよう加工し、被係合部の外周径を小さくなるように加工しているが、逆の構成であってもよい。つまり、被係合部の内周径が大きくなるよう加工し、係合部の外周径を小さくなるように加工してもよいことは勿論である。
また、前記各実施例では、内周面に突起を突設し外周面に被係合溝を凹設しているが、逆の構成であってもよい。つまり、内周面に被係合溝を凹設し外周面に突起を突設した構成としてもよいことは勿論である。 By the way, in each said Example, it processed so that the inner peripheral diameter of an engaging part may become large, and it processed so that the outer peripheral diameter of an to-be-engaged part may become small, However, The reverse structure may be sufficient. That is, it goes without saying that processing may be performed so that the inner peripheral diameter of the engaged portion is increased and the outer peripheral diameter of the engaging portion is decreased.
In each of the above embodiments, the protrusion is provided on the inner peripheral surface and the engaged groove is provided on the outer peripheral surface. However, the reverse configuration may be used. That is, it is needless to say that the engaged groove may be recessed on the inner peripheral surface and the protrusion may protrude from the outer peripheral surface.

また、前記各実施例では、コンクリートや石材用のコアドリルについて説明したが、木材用のコアドリル、金属用のコアドリルの場合にも、本発明を同様に適用することができることは言うまでもない。 In each of the above-described embodiments, the core drill for concrete or stone has been described. Needless to say, the present invention can be similarly applied to a core drill for wood and a core drill for metal.

本発明にかかるコアドリルは、コンクリートや石材、木材、金属、樹脂等の種々の穿設等に利用することができる。 The core drill according to the present invention can be used for various drilling of concrete, stone, wood, metal, resin and the like.

本発明の一実施例にかかるコアドリルの全体の概略の構成を一部断面し且つ各構成を組立前の状態で示した全体の分解側面図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded side view of the entire core drill according to an embodiment of the present invention, partly in cross section and showing each configuration in a state before assembly. 図１に示す刃体部とその基端側に選択的に配設される延設筒部の先端部分を、軸長手方向に延びる中心線の右半分を断面して内部の構成を示す図１の部分拡大図である。FIG. 1 is a cross-sectional view of the inner half of the blade body portion shown in FIG. 1 and a distal end portion of an extending tube portion that is selectively provided on the proximal end side of the center line extending in the axial longitudinal direction. FIG. 図１に示す延設筒部とその基端側に選択的に配設される駆動軸側取着部を示す図で、該延設筒部の基端部の一部を断面し、且つ該駆動軸側取着部をその軸長手方向に延びる中心線の右半分を断面して、各内方を示す図１の部分拡大図である。FIG. 2 is a view showing an extending cylinder portion shown in FIG. 1 and a drive shaft side attaching portion selectively disposed on the proximal end side thereof, and a cross section of a part of the proximal end portion of the extending cylinder portion; FIG. 2 is a partially enlarged view of FIG. 1 showing each inward section of the drive shaft side attachment portion by cutting a right half of a center line extending in the longitudinal direction of the shaft. 図１に示す駆動軸側取着部と該駆動軸側取着部を取着する取着用アタッチメントとを、該駆動軸側取着部を軸長手方向に延びる中心線の右半分を断面し、該取着用アタッチメントを軸長手方向に延びる中心線の左半分を断面して、内部の構成を示す図１の部分拡大図である。The drive shaft side attachment portion shown in FIG. 1 and the attachment for attaching the drive shaft side attachment portion are cross-sectioned on the right half of the center line extending in the longitudinal direction of the drive shaft side attachment portion, FIG. 2 is a partially enlarged view of FIG. 1 showing an internal configuration by cross-sectioning the left half of a center line extending in the axial longitudinal direction of the attachment. 図１〜図４に示す被係合溝部分構成等を示す図で、（ａ）は該被係合溝のある駆動軸側取着部あるいは延設筒部の各先端部の端面を先端方から見た図、（ｂ）は（ａ）のＶｂ部分の部分拡大図である。FIGS. 5A and 5B are diagrams illustrating the engaged groove portion configuration shown in FIGS. 1 to 4, in which FIG. 4A shows the end surface of each distal end portion of the drive shaft side attachment portion or the extended cylindrical portion having the engaged groove in the distal direction. (B) is a partially enlarged view of the Vb portion of (a). 図１〜図４に示す突起部分の構成等を示す図で、（ａ）は該突起合溝のある刃体部あるいは延設筒部の各基端部の端面を基端方から見た図、（ｂ）は（ａ）のＶＩｂ部分の部分拡大図である。FIGS. 1A to 4C are views showing the configuration and the like of the protruding portion shown in FIGS. 1 to 4, in which FIG. (B) is the elements on larger scale of the VIb part of (a). 図５に示す被係合溝の軸長手方向に延びる溝部分に図６に示す突起が係合した状態を拡大して示す部分拡大断面図である。FIG. 6 is a partial enlarged cross-sectional view showing in an enlarged manner a state in which the protrusion shown in FIG. 6 is engaged with a groove portion extending in the axial longitudinal direction of the engaged groove shown in FIG. 5. 本コアドリルの使用してコンクリート等に穿設するときの状態を示す図で、（ａ）はセンターピンを取着し且つ延設筒部を使用しない状態のコアドリルを用いて位置決めして穿設しようとする直前の状態を示す図、（ｂ）は位置決め完了後に延設筒部を使用して穿設しようとする直前の状態を示す図である。It is a figure which shows the state when drilling in concrete etc. using this core drill, (a) Let's position and drill using the core drill of the state which attaches a center pin and does not use an extension cylinder part FIG. 5B is a diagram showing a state immediately before attempting to pierce using the extended cylindrical portion after completion of positioning. 図１、図４に図示する取着用アタッチメントの係合溝部分の構成を示す拡大図である。It is an enlarged view which shows the structure of the engagement groove part of the attachment shown in FIG. 1, FIG. 別の実施例にかかる延設筒部あるいは駆動軸側取着部の被係合溝の構成を示す部分拡大図である。It is the elements on larger scale which show the structure of the to-be-engaged groove | channel of the extending cylinder part concerning another Example, or a drive-shaft side attaching part.

Explanation of symbols

Ａ…コアドリル
１…刃体部
１Ａ…胴部
１Ｂ…刃部
１Ｃ…係合部
２…駆動軸側取着部
２Ａ…胴部
２Ｂ…被係合部
２Ｒ…取着部
３…延設筒部
３Ａ…胴部
３Ｂ…被係合部
３Ｃ…係合部

A ... Core drill
1 ... Blade part
1A ... trunk
1B ... Blade
1C: engaging portion
2 ... Drive shaft side mounting part
2A ... trunk
2B ... engaged portion
2R ... Mounting part
3 ... Extension tube part
3A ... trunk
3B ... engaged portion
3C ... engaging part

Claims

A blade body provided with a cylindrical body, a blade formed on the distal end of the body, and an engaging part formed on the proximal end of the body;
A cylindrical body, an engaged part that is formed at the distal end of the body and engages with the engaging part, and a drive shaft side of a rotary tool that is formed at the proximal end of the body. A drive shaft side mounting portion provided with a mounting portion for,
A cylindrical body portion, an engaged portion formed at the distal end of the body portion and engageable with the engaging portion, and a drive shaft side attachment portion or other portion formed at the proximal end of the body portion And having at least one extended tube portion selectively provided with an engaging portion that can be engaged with an engaged portion of the extended tube portion,
In use, the drive shaft side attaching portion can be connected directly to the proximal end of the blade body portion or via the extended tube portion in accordance with the hole depth to be drilled. A core drill characterized by being configured as follows.

Each blade portion of the blade body portion, the drive shaft side attachment portion, and the extending cylindrical portion is composed of a pipe-shaped member having the same thickness and the same diameter,
The wall thickness of the engaging portion is formed thinner than the distal end by processing so that the inner peripheral diameter of each engaging portion of the blade body portion and the extending cylindrical portion is increased, and ,
By forming the engaged portion of the drive shaft side attaching portion and the extended cylindrical portion to be smaller in outer peripheral diameter, the engaged portion is made thinner than its proximal end. Has been
In a state where the thin portion of the engaging portion and the thin portion of the engaged portion are engaged, the outer peripheral surface and inner peripheral surface of the portion where the outer peripheral surface and inner peripheral surface of the engaged portion are adjacent to each other The core drill according to claim 1, wherein the core drill is coupled in a state without a step.

On the inner peripheral surface of the engaging portion, a protrusion is formed that protrudes in the inner diameter direction with a protruding dimension less than the thickness of the engaged portion, and
3. The engaged groove for engaging the projection with a depth equal to or less than the thickness of the engaged portion is formed on the outer peripheral surface of the engaged portion. Core drill.

On the outer peripheral surface of the engaged portion, a protrusion is formed that protrudes in an outer radial direction with a protruding dimension less than the thickness of the engaging portion,
The core drill according to claim 2, wherein a groove to be engaged is formed on an inner peripheral surface of the engagement portion, the depth of the engagement portion being equal to or less than a thickness of the engagement portion, the engagement groove engaging with the projection. .

Each blade portion of the blade body portion, the drive shaft side attachment portion, and the extending cylindrical portion is composed of a pipe-shaped member having the same thickness and the same diameter,
The wall thickness of the engaging portion is formed thinner than the distal end by processing so that the outer peripheral diameter of each engaging portion of the blade body portion and the extending cylindrical portion is smaller, and
The thickness of the engaged portion is made thinner than the base end by processing the inner peripheral diameter of each engaged portion of the drive shaft side attaching portion and the extending cylindrical portion. Formed,
In a state where the thin portion of the engaging portion and the thin portion of the engaged portion are engaged, the outer peripheral surface and inner peripheral surface of the portion where the outer peripheral surface and inner peripheral surface of the engaged portion are adjacent to each other The core drill according to claim 1, wherein the core drill is coupled in a state without a step.

On the outer peripheral surface of the engaging portion, a protrusion protruding outward is formed with a protruding dimension less than the thickness of the engaged portion,
6. An engaged groove is formed on an inner peripheral surface of the engaged portion, the engagement groove engaging with the projection having a depth equal to or less than a thickness of the engaged portion. Core drill.

On the inner peripheral surface of the engaged portion, a protrusion is formed that protrudes in the inner diameter direction with a protruding dimension less than the thickness of the engaging portion,
6. The core drill according to claim 5, wherein a groove to be engaged is formed on the outer peripheral surface of the engaging portion, the engaging groove being engaged with the protrusion and having a depth equal to or less than a thickness of the engaging portion.

The protrusion is constituted by a circular protrusion when viewed from a direction perpendicular to the peripheral surface, one end of the engaged groove is released to the front end surface of the engaged portion, and the engaged groove is the peripheral surface. The engaged groove is constituted by a substantially T-shaped groove such that the lower end of the T-shape is one end of the engaged groove when viewed from a direction perpendicular to the groove. The core drill according to any one of 4, 6, and 7.

9. The blade body portion according to claim 1, wherein the blade body portion is any one of a plurality of blade body portions provided with a cutting blade suitable for an object to be drilled. The core drill according to any one of the items.