JPH0475813A - Core drill - Google Patents
Core drillInfo
- Publication number
- JPH0475813A JPH0475813A JP18914990A JP18914990A JPH0475813A JP H0475813 A JPH0475813 A JP H0475813A JP 18914990 A JP18914990 A JP 18914990A JP 18914990 A JP18914990 A JP 18914990A JP H0475813 A JPH0475813 A JP H0475813A
- Authority
- JP
- Japan
- Prior art keywords
- core body
- coupling
- top wall
- top plate
- ball
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000008878 coupling Effects 0.000 claims abstract description 34
- 238000010168 coupling process Methods 0.000 claims abstract description 34
- 238000005859 coupling reaction Methods 0.000 claims abstract description 34
- 238000005553 drilling Methods 0.000 claims abstract description 26
- 238000000926 separation method Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
- B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
- B28D1/04—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs
- B28D1/041—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs with cylinder saws, e.g. trepanning; saw cylinders, e.g. having their cutting rim equipped with abrasive particles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
- B23B31/02—Chucks
- B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means
- B23B31/113—Retention by bayonet connection
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B51/00—Tools for drilling machines
- B23B51/04—Drills for trepanning
- B23B51/0473—Details about the connection between the driven shaft and the tubular cutting part; Arbors
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
- Drilling Tools (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、コンクリート材等に対して比較的大口径穴
を穿穴するのに用いるコアドリルに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a core drill used for drilling relatively large diameter holes in concrete materials and the like.
(従来技術〕
従来より、大口径穴の1穴用として多種多様のコアドリ
ルが開発され市販されており、これ等のコアドリルでは
、被穿入体の材質に適合させた穿穴刃を備えている。(Prior art) A wide variety of core drills have been developed and commercially available for single-hole large-diameter holes, and these core drills are equipped with drilling blades adapted to the material of the object to be drilled. .
ところで、固化したコンクリート材を対象とするコアド
リルでは、円筒状をなすコア体の下端開口周縁に超硬合
金チ・ンプからなる穿穴刃が設けられ、この穿穴刃の側
面はコア体の内外両面に対して僅かに突出させた分厚い
形態を採っている。By the way, in a core drill for solidified concrete, a drilling blade made of a cemented carbide tip is provided at the periphery of the opening at the bottom of the cylindrical core body, and the side surfaces of this drilling blade are located inside and outside the core body. It has a thick shape that protrudes slightly from both sides.
このように、コア体の内外両面に突出状とする穿穴刃を
設けたコアドリルを用いてコンクリート材に対して貫通
穴を穿穴する場合、穿入後にコア体内部には円柱状に刺
り貫かれた切削塊が残るが、この切削塊をコア体の下端
開口側へ抜き取るには、コア体内面側に突出する穿穴刃
部が邪魔して抜き取りを困難にする。In this way, when drilling a through hole in concrete using a core drill equipped with protruding drilling blades on both the inner and outer surfaces of the core body, a cylindrical hole is drilled inside the core body after drilling. A cut lump that has been pierced remains, but the drilling blade protruding toward the inner surface of the core body obstructs the removal of this cut lump toward the lower end opening side of the core body, making it difficult to pull it out.
そこで、コア体内からの切削塊の抜き取りを容易にする
ために、シャンクと一体とする頂盤に対してコア体を別
体に構成し、穿入後に両者を分離1−2で切削塊をコア
体の上端開口側から抜き取るようにし5たコアドリルが
提案されている。Therefore, in order to make it easier to remove the cutting lump from the core body, the core body is constructed separately from the top plate which is integrated with the shank, and after drilling, the two are separated 1-2 to remove the cutting lump from the core. A core drill has been proposed which is designed to be extracted from the upper opening side of the body.
〔発明が解決しようとする課題]
ところが、頂壁とコア体を別体とする従来のコアト”リ
ルでは、頂壁とコア体との結合乙−ねし構造等が採用さ
れているため、両者の結合・分離に手間が掛かり作業性
が悪く、また、繰り返1、の使用でねし構造部が損耗し
て両者の結合関係に悪影響を与える等の問題がある。[Problems to be Solved by the Invention] However, in the conventional Coretril, in which the top wall and the core body are separate bodies, a joint structure between the top wall and the core body, etc. is adopted. It takes time and effort to connect and separate the two, resulting in poor workability, and there are also problems such as repeated use of the screw structure wears out and adversely affects the connection relationship between the two.
この発明は上記の点に鑑みなされたものであって、頂壁
とコア体との結合・分離が簡単にできて取り扱いに便利
であり、繰り返(7の使用でも結合関係が変わらず信頼
性が高く、作業性に優れ、たコアドリルを提イ具するこ
とを目的々する。This invention was made in view of the above points, and it is easy to connect and separate the top wall and the core body, making it convenient to handle, and the connection relationship remains unchanged even after repeated use (7). The purpose is to provide a core drill with high performance and excellent workability.
上記の目的を達成するためのごの発明の要旨とする古こ
ろは、上面中央にシャンクを有する頂壁と、下端開口F
′]縁に穿穴刃を設けた円筒状のコア体からなり、上記
頂壁にコア体取付jJ部を形設j7、頂壁上部からコア
体取付は部周面に向けて、頂壁軸心方向乙こ傾斜し7、
且つ、頂壁半径方向に傾斜する複数個の保持孔を設け、
該保持孔内に、ばね乙こより付勢して結合用ボールを収
嵌保持し2てコア体取付は部周面に突出させ、コア体取
付は部が嵌挿される上記コア体の−J二端開口部C5二
、結合用ボールが係脱する係合孔を設し3た、ことを特
徴とするコアドリルにある。In order to achieve the above object, the old roller has a top wall having a shank at the center of the upper surface, and an opening F at the bottom end.
′] Consists of a cylindrical core body with a perforation blade on the edge, and a core body mounting part JJ is formed on the top wall.The core body is attached from the top of the top wall toward the circumferential surface of the top wall axis. 7, tilting toward the heart
and providing a plurality of holding holes inclined in the radial direction of the top wall,
The coupling ball is fitted and held in the holding hole by the force of the spring 2, and the core body is attached to the -J2 part of the core body into which the part is inserted. The core drill is characterized in that it has an end opening C5 and an engagement hole into which the coupling ball engages and disengages.
[作 用]
頂壁のコア体取付は部をコア体の上端開口部に嵌挿する
と、コア体の」二端開ロ経が結合用ボールに上向きに摺
接してこれを押し込み、結合用ボールが係合孔に合致し
て突出係合1−1頂盤とコア体とが結合される。[Function] To attach the core body on the top wall, when the part of the core body is inserted into the upper end opening of the core body, the opening diameter at the second end of the core body slides upward against the connecting ball and pushes it in, causing the connecting ball to is aligned with the engagement hole, and the protruding engagement 1-1 top plate and the core body are coupled.
頂壁とコア体とが結合した状態で、頂壁と:7ア体を軸
線方向に引き離す力を加えると、結合用ボールには、こ
れに接触する係合孔縁から下向きに掛かる力の一部が結
合用ボールを外向きに引き出す方向に作用し、頂壁とコ
ア体との分離を阻止する。When a force is applied to separate the top wall and the core body in the axial direction while the top wall and the core body are connected, the coupling ball will receive part of the force applied downward from the edge of the engagement hole that comes into contact with it. The portion acts in a direction to pull the coupling ball outward and prevents separation of the top wall and the core body.
穿孔作業において穿孔方向に回転させる時、頂壁側から
の回転トルクは、コア体に対して結合用ボールが突出係
合する係合孔縁を押圧し5て伝達されるが、この押圧力
の一部は結合用ボールを外向きに引き出″g一方向に作
用し、頂壁とコア体との結合関係を安定させて7穴が行
われる。When rotating in the drilling direction during drilling work, the rotational torque from the top wall side is transmitted by pressing the engagement hole edge where the coupling ball protrudes and engages with the core body. A portion of the connecting ball is pulled outward and acts in one direction to stabilize the connecting relationship between the top wall and the core body, and the seven holes are made.
頂壁に対してコア体を上記7穴時とは逆方向に相対的に
回動させると、コア体の係合孔縁が結合用ボールtこ横
向きtこ摺接して結合用ボールを押し、込み、結合用ボ
ールが係合孔から抜出したところで頂壁とコア体を軸線
方向に引き離すと両者は分離される。When the core body is rotated relative to the top wall in the opposite direction to that for the seven holes, the edge of the engagement hole of the core body slides into horizontal contact with the coupling ball and pushes the coupling ball, When the top wall and the core body are pulled apart in the axial direction when the coupling ball is pulled out from the engagement hole, the two are separated.
以F、この発明の実施例を図面を参院しながら具体的に
説明する。Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
第1図はこの発明のコアドリルの分解斜視図、第2図は
頂壁の正面図、第3図は一部を欠除した頂壁の平面図で
ある。FIG. 1 is an exploded perspective view of the core drill of the present invention, FIG. 2 is a front view of the top wall, and FIG. 3 is a partially cutaway plan view of the top wall.
図において、1は頂壁で、上面中央にシャンク2を有す
る。、3は頂壁1に形設したコア体取付は部で、1部に
ストッパー周鍔4を有する。In the figure, 1 is a top wall, and has a shank 2 at the center of the top surface. , 3 is a core body attachment part formed on the top wall 1, and one part has a stopper flange 4.
5はコア体取付は部3周面に向けて、頂壁1−F部から
設けた複数個の保持孔で、この保持孔5は、頂壁軸心に
対して所定の角度に傾斜させ、且つ、頂壁半径方向6二
対して所定の角度に傾斜させたもので、コア体取付は部
3周面に開口6を有し、この開口6は後述する結合用ボ
ールの抜出を防止するためj、こ若干狭窄した構成にし
ている。Reference numeral 5 denotes a plurality of holding holes provided from the top wall 1-F toward the circumferential surface of the core body mounting portion 3, and the holding holes 5 are inclined at a predetermined angle with respect to the axis of the top wall. In addition, it is inclined at a predetermined angle with respect to the radial direction 62 of the top wall, and has an opening 6 on the circumferential surface of the core body mounting portion 3, and this opening 6 prevents the coupling ball, which will be described later, from being pulled out. Therefore, it has a slightly constricted configuration.
7はこの保持孔5内に収嵌保持した結合用ボールで、保
持孔5内においてばね8乙こよって開口6向けに付勢し
て結合用ボール7の一部を開口6から突出させている。Reference numeral 7 denotes a coupling ball that is fitted and held in the holding hole 5, and is biased toward the opening 6 by a spring 8B in the holding hole 5, so that a part of the coupling ball 7 protrudes from the opening 6. .
9ば下端開口周縁に穿穴刃10を設けた円筒状のコア体
で、実施例における穿穴刃10は超硬合金チ・ノブから
なり、コンクリ−1〜等への穿入乙こ適合させたもので
、穿穴刃10の側面をコア体内外両面に対して僅かに突
出状にしている。9 is a cylindrical core body with a drilling blade 10 provided at the periphery of the opening at the lower end, and the drilling blade 10 in the embodiment is made of a cemented carbide tip knob, and is suitable for drilling into concrete 1 to etc. The side surfaces of the drilling blade 10 are slightly protruded from both the inner and outer surfaces of the core body.
11は結合用ボール7に対応してコア体9の」二端開ロ
部に設けられ、コア体数イ」け部周面において結合用ボ
ール7が係脱する係合孔で、開口6から突出する結合用
ボール7の大きさに適合させている。Reference numeral 11 denotes an engagement hole, which is provided at the opening at the two ends of the core body 9 corresponding to the coupling ball 7, and through which the coupling ball 7 engages and disengages on the circumferential surface of the core body 9. It is adapted to the size of the protruding coupling ball 7.
尚、図中12は頂壁1上面に重合状に固着した覆板、1
3は保持孔5内に挿着さればね8を圧縮状態に押圧保持
する押当片である。In addition, 12 in the figure is a cover plate fixed to the upper surface of the top wall 1 in a superposed manner;
Reference numeral 3 denotes a pressing piece that is inserted into the holding hole 5 and presses and holds the spring 8 in a compressed state.
上記構成において、頂壁軸心並びに頂壁半径方向に対す
る保持孔5の傾斜方向としては、穿入時の回転方向に対
してその間口6が背向する方向を採り、それぞれの傾斜
角度は、次ぎの条件を満足させて設定される。In the above configuration, the inclination direction of the holding hole 5 with respect to the top wall axis and the top wall radial direction is the direction in which the opening 6 is opposite to the rotation direction at the time of drilling, and the respective inclination angles are as follows. It is set by satisfying the following conditions.
(a) コア体取付は部3をコア体9の上端開口部に
嵌挿するのに、第4図に示すようにコア体取付は部3周
面に突出する結合用ボール7を、コア体9の上端開口縁
が上向きに押圧する時は、結合用ボール7にコア体9の
上端開口縁が摺接して結合用ボール7を保持孔5内に押
し込むようにする。(a) When attaching the core body, the part 3 is inserted into the upper end opening of the core body 9. As shown in FIG. When the upper end opening edge of the core body 9 presses upward, the upper end opening edge of the core body 9 comes into sliding contact with the coupling ball 7 and pushes the coupling ball 7 into the holding hole 5.
(b) 頂壁1とコア体9とが結合した状態で、第5
図に示すように頂壁1とコア体9を軸線方向に引き離す
力を加える時は、結合用ボール7には係合孔縁を介して
下向きに引き出す方向の力が作用して結合用ボール7は
動かず、頂壁1とコア体9との分離を阻止するようにす
る。(b) With the top wall 1 and the core body 9 connected, the fifth
As shown in the figure, when a force is applied to separate the top wall 1 and the core body 9 in the axial direction, a force is applied to the coupling ball 7 in a downward direction through the engagement hole edge, and the coupling ball 7 does not move and prevents separation of the top wall 1 and the core body 9.
(C) 第6図に示すように頂壁1とコア体9を結合
して穿孔方向に回転させる時は、結合用ボール7には外
向きに引き出す方向の力が作用して動かず、頂壁lとコ
ア体9との保合関係を安定させるようにする。(C) When the top wall 1 and the core body 9 are combined and rotated in the drilling direction as shown in FIG. The cohesive relationship between the wall l and the core body 9 is stabilized.
(d) 第7図に示すように頂壁lに対してコア体9
を上記穿入方向とは逆方向に相対的に回動させる時は、
結合用ボール7は係合孔縁により横向きに押圧され、結
合用ボール7に係合孔縁が摺接して結合用ボール7を保
持孔5内に押し込み、頂壁1とコア体9との引き離しか
可能になるようにする。(d) As shown in FIG. 7, the core body 9 is attached to the top wall l.
When relatively rotating in the direction opposite to the above-mentioned drilling direction,
The coupling ball 7 is pressed sideways by the edge of the engagement hole, and the edge of the engagement hole slides into contact with the coupling ball 7, pushing the coupling ball 7 into the holding hole 5, and separating the top wall 1 and the core body 9. or make it possible.
(効 果]
上記の如く構成したこの発明のコアドリルは、次のよう
な効果を奏する。(Effects) The core drill of the present invention configured as described above has the following effects.
(1)結合用ボールを介して頂壁とコア体とが結合され
るもので、その結合は、頂壁のコア体取付は部をコア体
の上端開口部を嵌入し、コア体の係合孔に頂壁側の結合
用ボールを係合させるだけでよいから、ワンタッチ的に
簡単にできて作業性を向上する。(1) The top wall and the core body are connected via a connecting ball, and the connection is achieved by fitting the core body attachment part of the top wall into the upper end opening of the core body, and then engaging the core body. Since it is only necessary to engage the coupling ball on the top wall side with the hole, it can be easily done with one touch, improving work efficiency.
(2)頂壁とコア体との分離は、頂壁とコア体とを若干
相対的に回動させて係合孔に対する結合用ボールの係合
間係を解いて後、軸心方向への引き離を可能にするから
、頂壁とコア体とは不用意に分離するようなことがなく
、取り扱いを便利にする。(2) The top wall and the core body can be separated by rotating the top wall and the core body slightly relative to each other to release the coupling ball from the engagement hole, and then pulling it in the axial direction. Since the top wall and the core body can be separated from each other, the top wall and the core body will not be accidentally separated, making handling convenient.
(3)コア体の上端開口部には、複数個の孔が穿設しで
あるだけであるから、穿穴作業後にコア体内部に残る切
削塊をコア体の上端開口部から抜き取る時に、コア体内
には邪魔する突起物が全くな(、切削塊の取り出しを簡
単にし、また、繰り返しの使用でも損耗等は起こらず、
耐用寿命の延長が図られる。(3) Since a plurality of holes are simply drilled in the upper end opening of the core body, when removing the cutting lump remaining inside the core body after the drilling operation, the core body There are no protrusions inside the body that can get in the way (it makes it easy to take out the cutting lumps, and there is no wear and tear even with repeated use.
The service life will be extended.
(4)頂壁とコア体との結合部を規格化しておけば、一
つの頂壁に対して穿穴刃の種類を違えた複数種のコア体
が共用できるから、被穿入体の種類を違えての穿入や、
穿穴刃が損耗した時のコア体の交換等に便利であり、経
済的で汎用性が高い。(4) If the joint between the top wall and the core body is standardized, multiple types of core bodies with different types of drilling blades can be used in common for one top wall. Penetration with different
It is convenient for replacing the core body when the drilling blade is worn out, and is economical and highly versatile.
第1図はこの発明のコアドリルの分解斜視図、第2図は
頂壁の正面図、第3図は頂壁の一部を欠除した平面図、
第4図は頂壁とコア体の結合途中を説明するための要部
の縦断面図、第5図は頂壁とコア体の結合状態を説明す
のための要部の縦断面図、第6図は穿孔時を説明するた
めの要部の横断面図、第7図は頂壁とコア体の分離を説
明するための要部の正面図である。
1・・・頂壁、2・・・シャンク、3・・・コア体取付
は部、4・・・ストッパー周鍔、5・−・保持孔、6・
・・開口、7・・・結合用ボール、8・・・ばね、9・
・・コア体、10・・・穿穴刃、11・・・係合孔、1
2・・・覆板、13・・・押当片。
第1図
第4図
第6図
第2図
第3図
第7図FIG. 1 is an exploded perspective view of the core drill of the present invention, FIG. 2 is a front view of the top wall, and FIG. 3 is a plan view with a portion of the top wall removed.
FIG. 4 is a vertical cross-sectional view of the main part to explain the connection between the top wall and the core body, FIG. 5 is a vertical cross-sectional view of the main part to explain the connection state of the top wall and the core body, FIG. 6 is a cross-sectional view of the main part for explaining the drilling process, and FIG. 7 is a front view of the main part for explaining the separation of the top wall and the core body. DESCRIPTION OF SYMBOLS 1... Top wall, 2... Shank, 3... Core body mounting part, 4... Stopper flange, 5... Holding hole, 6...
...Opening, 7...Ball for connection, 8...Spring, 9.
...Core body, 10...Drilling blade, 11...Engagement hole, 1
2... Cover plate, 13... Pressing piece. Figure 1 Figure 4 Figure 6 Figure 2 Figure 3 Figure 7
Claims (1)
穴刃を設けた円筒状のコア体からなり、上記頂壁にコア
体取付け部を形設し、頂盤上部からコア体取付け部周面
に向けて、頂壁軸心方向に傾斜し、且つ、頂壁半径方向
に傾斜する複数個の保持孔を設け、該保持孔内に、ばね
により付勢して結合用ボールを収嵌保持してコア体取付
け部周面に突出させ、コア体取付け部が嵌挿される上記
コア体の上端開口部に、結合用ボールが係脱する係合孔
を設けたことを特徴とするコアドリル。It consists of a top wall with a shank in the center of the top surface, and a cylindrical core body with a drilling blade provided around the opening at the lower end. A plurality of holding holes are provided that are inclined in the axial direction of the top wall and in the radial direction of the top wall, and the coupling balls are fitted and held in the holding holes by being biased by a spring. A core drill characterized in that an engagement hole into which a coupling ball engages and disengages is provided in the upper end opening of the core body, which protrudes from the circumferential surface of the core body attachment part and into which the core body attachment part is inserted.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18914990A JPH07100245B2 (en) | 1990-07-17 | 1990-07-17 | Core drill |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18914990A JPH07100245B2 (en) | 1990-07-17 | 1990-07-17 | Core drill |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0475813A true JPH0475813A (en) | 1992-03-10 |
JPH07100245B2 JPH07100245B2 (en) | 1995-11-01 |
Family
ID=16236250
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP18914990A Expired - Lifetime JPH07100245B2 (en) | 1990-07-17 | 1990-07-17 | Core drill |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH07100245B2 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001038027A1 (en) * | 1999-11-19 | 2001-05-31 | Kabushiki Kaisha Miyanaga | Core body lock device of core drill and core body used for the device |
EP1447195A1 (en) * | 2003-02-12 | 2004-08-18 | Narex Ceska Lipa a.s. | Drilling device with a core drill |
WO2005068119A1 (en) * | 2004-01-17 | 2005-07-28 | A.V. Custom Style B.V. | Tool-change arbor system |
JP5679390B1 (en) * | 2014-06-30 | 2015-03-04 | 有限会社シーアールサービス | Vehicle headlamp |
US9751135B1 (en) * | 2016-11-08 | 2017-09-05 | Hole Dynamics, LLC | Quick release hole saw |
US20170252834A1 (en) * | 2015-06-09 | 2017-09-07 | Thomas J. Spera | Hole-saw |
USD871877S1 (en) | 2018-04-24 | 2020-01-07 | Hole Dynamics, LLC | Hole saw arbor |
-
1990
- 1990-07-17 JP JP18914990A patent/JPH07100245B2/en not_active Expired - Lifetime
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001038027A1 (en) * | 1999-11-19 | 2001-05-31 | Kabushiki Kaisha Miyanaga | Core body lock device of core drill and core body used for the device |
US6926476B1 (en) | 1999-11-19 | 2005-08-09 | Kabushiki Kaisha Miyanaga | Core body lock device of core drill and core body used for the device |
EP1447195A1 (en) * | 2003-02-12 | 2004-08-18 | Narex Ceska Lipa a.s. | Drilling device with a core drill |
WO2005068119A1 (en) * | 2004-01-17 | 2005-07-28 | A.V. Custom Style B.V. | Tool-change arbor system |
JP5679390B1 (en) * | 2014-06-30 | 2015-03-04 | 有限会社シーアールサービス | Vehicle headlamp |
US20170252834A1 (en) * | 2015-06-09 | 2017-09-07 | Thomas J. Spera | Hole-saw |
US9751135B1 (en) * | 2016-11-08 | 2017-09-05 | Hole Dynamics, LLC | Quick release hole saw |
US9821380B1 (en) | 2016-11-08 | 2017-11-21 | Hole Dynamics, LLC | Quick release hole saw |
USD871877S1 (en) | 2018-04-24 | 2020-01-07 | Hole Dynamics, LLC | Hole saw arbor |
USD926008S1 (en) | 2018-04-24 | 2021-07-27 | Hole Dynamics, LLC | Hole saw arbor |
Also Published As
Publication number | Publication date |
---|---|
JPH07100245B2 (en) | 1995-11-01 |
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