JPH05169307A - Core drill - Google Patents

Core drill

Info

Publication number
JPH05169307A
JPH05169307A JP33358491A JP33358491A JPH05169307A JP H05169307 A JPH05169307 A JP H05169307A JP 33358491 A JP33358491 A JP 33358491A JP 33358491 A JP33358491 A JP 33358491A JP H05169307 A JPH05169307 A JP H05169307A
Authority
JP
Japan
Prior art keywords
cutting
tip
abrasive
efficiency
core
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
Application number
JP33358491A
Other languages
Japanese (ja)
Other versions
JP2549787B2 (en
Inventor
Tsunehiro Ezaki
歴弘 江崎
Akiji Kobayashi
明司 小林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rasa Industries Ltd
Original Assignee
Rasa Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Rasa Industries Ltd filed Critical Rasa Industries Ltd
Priority to JP3333584A priority Critical patent/JP2549787B2/en
Publication of JPH05169307A publication Critical patent/JPH05169307A/en
Application granted granted Critical
Publication of JP2549787B2 publication Critical patent/JP2549787B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28DWORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/02Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
    • B28D1/04Working 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
    • B28D1/041Working 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

Abstract

PURPOSE:To improve the cutting efficiency by improving the efficiency of supplying abrasives to an area working for dressing a cutting chip. CONSTITUTION:A core drill 4 comprises a cylindrical core 14 including a fitting portion 14a to an apparatus main body 6 at the rear end portion, block-like cutting chips 16 fixed at substantially equal spaces in the circumferential direction to the tip 14c of the cylindrical core 14, and a soft member 16 for filling up gap areas between the respective cutting chips 16 in the circumferential direction. The soft member 18 is formed by raw material which is equal to that of the cutting chip 16 or softer, so that the chip part forms substantially ring shape having a substantially rectangular section due to the existence of the soft member 18.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】この発明は、コンクリート等の被削材を穿
孔するためのコアドリルに関し、詳しくは、切削部位に
冷却流体とともに研削材を供給して切削効率の向上を図
るタイプのドリル装置に用いられるコアドリルに関する
ものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core drill for drilling a work material such as concrete. More specifically, the present invention relates to a core drill used in a drilling device of a type that supplies a cooling fluid together with a coolant to a cutting site to improve cutting efficiency. It is about.

【0002】[0002]

【従来の技術】この種のコアドリルでは、筒状コアの先
端に複数のブロック状の切削チップが周方向に間隔をお
いて固着された構造となっており、周方向における各切
削チップ間の空隙部は、主として空気等の冷却流体や切
削屑の排出促進孔としての役割をなす。
2. Description of the Related Art This type of core drill has a structure in which a plurality of block-shaped cutting tips are fixed to the tip of a cylindrical core at intervals in the circumferential direction, and a gap between the cutting tips in the circumferential direction is formed. The part mainly serves as a discharge promoting hole for a cooling fluid such as air and cutting chips.

【0003】また、各切削チップは切刃としてのダイヤ
モンド粒をバインダ材で固めて形成されており、良好な
切削状態が維持されるには、最外面のダイヤモンド粒が
切刃としての役目を終えて損耗ないし欠落した後に、バ
インダ材が適度に摩耗して順次内方の新しいダイヤモン
ド粒が現れる目立て作用が要求される。本出願人は、研
削材を冷却流体としての圧搾空気とともに被削材の切削
部位に送り込み、切削チップの冷却と目立て作用とを同
時に行うことが、非常に有益であることを発見し、特願
平3ー86940号及び同3ー215201号にて、研
削材と圧搾空気との混合流体供給技術を提供している。
Further, each cutting tip is formed by solidifying diamond grains as a cutting edge with a binder material, and in order to maintain a good cutting state, the diamond grain on the outermost surface finishes its role as a cutting edge. After the abrasion or loss, the binder material is appropriately abraded, and new inward diamond grains are successively produced, so that a dressing action is required. The applicant of the present invention has found that it is very useful to send the abrasive together with compressed air as a cooling fluid to the cutting portion of the work material to simultaneously cool the cutting tip and perform the dressing action. Japanese Patent Laid-Open Nos. 3-86940 and 3-215201 provide a mixed fluid supply technology of an abrasive and compressed air.

【0004】[0004]

【発明が解決しようとする課題】ところで、本出願人に
係る上記技術では、研削材による積極的な目立て作用に
よって切削効率の向上がなされることが実証されている
が、周方向における切削チップ間の空隙部の存在によっ
て研削材の供給効率が阻害されるという問題を同時に抱
える現状にある。
By the way, it has been proved that the above-mentioned technique of the present applicant improves the cutting efficiency by the positive dressing action of the abrasive material. At the same time, there is a problem that the supply efficiency of the abrasive is hindered by the existence of the voids.

【0005】すなわち、良好な目立てがなされるには研
削材が切削チップの先端面に効率的に供給されることが
必要であるが、空隙部では冷却流体による切削チップの
冷却と切削屑の排出とを兼ねた搬送流が生じるため、図
4に示すように、搬送流に研削材Kが導かれて切削チッ
プ16の先端面16a(被削面Sに対向する面)域に届
かないまま、すなわち目立てに何ら寄与しないまま矢印
1 に示すように外部へ排出されている。一部は矢印E
2 に示すように切削チップ16の外周へ案内される。図
はドリルが略水平となるいわゆる横切りでの切削部位を
示しており、符号14は筒状コアを示し、符号14c、
14dは筒状コア14の先端面及び内面を示している。
また、符号38は切削チップ16間の空隙部を示し、符
号36はコンクリート等の被削材を示している。
That is, it is necessary for the abrasive to be efficiently supplied to the tip end surface of the cutting tip in order to make a good setting, but in the void portion, the cutting tip is cooled by the cooling fluid and the cutting waste is discharged. As shown in FIG. 4, the abrasive material K is guided to the carrier flow so as not to reach the tip surface 16a (the surface facing the work surface S) of the cutting tip 16, that is, as shown in FIG. It is discharged to the outside as shown by arrow E 1 without contributing to the sharpening. Part is arrow E
It is guided to the outer periphery of the cutting tip 16 as shown in 2 . The drawing shows a cutting portion in a so-called horizontal cut in which the drill is substantially horizontal, and reference numeral 14 indicates a cylindrical core, reference numeral 14c,
14d shows the tip end surface and the inner surface of the tubular core 14.
Further, reference numeral 38 indicates a gap between the cutting tips 16, and reference numeral 36 indicates a work material such as concrete.

【0006】本発明者による実験を踏まえた考察に基づ
けば、切削部位における切削状況を総合的に判断した場
合、空隙部の存在による冷却効率の良否よりも目立ての
良否による実質的な切削能率の良否のほうが全体の切削
効率に与える影響が大きいと推測される。また、冷却流
体による冷却機能は、切削溝との間に若干の排出孔が形
成されればある程度達成されることも確認されている。
Based on the consideration based on the experiment conducted by the present inventor, when comprehensively judging the cutting situation at the cutting site, the substantial cutting efficiency depending on the sharpness is determined rather than the cooling efficiency due to the existence of the voids. It is presumed that good or bad has a greater effect on the overall cutting efficiency. It has also been confirmed that the cooling function of the cooling fluid can be achieved to some extent if a small number of discharge holes are formed between the cutting fluid and the cutting groove.

【0007】従って、冷却流体による切削チップの冷却
機能並びに切削屑の排出機能の確保に対し、切削チップ
先端面への研削材の供給効率を可能な限り優先させるこ
とによって、結果的に切削効率の向上がなされることが
期待できる。
Therefore, in order to secure the cooling function of the cutting tip and the discharging function of the cutting waste by the cooling fluid, the efficiency of supplying the abrasive to the tip surface of the cutting tip is given priority as much as possible, resulting in the cutting efficiency It can be expected that improvements will be made.

【0008】そこで、この発明は、切削チップ先端面へ
の研削材の供給効率の向上を図ることができ、よって切
削効率の向上並びに研削材の使用効率の向上を図れるコ
アドリルの提供をその目的とする。
[0008] Therefore, an object of the present invention is to provide a core drill capable of improving the supply efficiency of the abrasive to the tip end surface of the cutting tip, thus improving the cutting efficiency and the use efficiency of the abrasive. To do.

【0009】[0009]

【課題を解決するための手段】この発明は、上記目的を
達成すべく創案されたもので、その特徴は、周方向にお
ける各切削チップ間の空隙部が切削チップと同等か軟質
の軟質部材で埋められている構成にある。
The present invention was devised to achieve the above object, and is characterized by a soft member in which the gap between the cutting tips in the circumferential direction is equal to or softer than the cutting tips. It is in a buried configuration.

【0010】[0010]

【作用】この発明によれば、研削材が筒状コア内に冷却
流体とともに供給され、切削部位へ供給される。供給さ
れた研削材は軟質部材の存在によって切削チップ間から
の逃げを阻止されるとともに、切削チップより早く摩耗
することによって形成される軟質部材部位の隙間から冷
却流体とともに外方に案内される。研削材は軟質部材部
位の隙間を通過することによって、周方向における切削
チップの先端面域に供給される。
According to the present invention, the abrasive is supplied into the cylindrical core together with the cooling fluid, and then supplied to the cutting site. The supplied abrasive is prevented from escaping from between the cutting tips due to the presence of the soft member, and is guided outward together with the cooling fluid from the gap of the soft member portion formed by being worn earlier than the cutting tips. The abrasive is supplied to the tip surface area of the cutting tip in the circumferential direction by passing through the gap in the soft member portion.

【0011】[0011]

【実施例】図1乃至図3はこの発明の一実施例を示す。
空気で冷却するいわゆる乾式タイプにおける横切りの切
削例を示す。ドリル装置2には、コアドリル4を有する
装置本体部6と、切削屑を吸引する集塵手段8と、図示
しないコンプレッサ等の空気源に接続される給気管10
と、研削材Kを供給する研削材供給手段12とが備えら
れている。
1 to 3 show an embodiment of the present invention.
An example of cross cutting in a so-called dry type in which cooling is performed with air is shown. The drill device 2 includes a device body 6 having a core drill 4, dust collecting means 8 for sucking cutting waste, and an air supply pipe 10 connected to an air source such as a compressor (not shown).
And an abrasive material supply means 12 for supplying the abrasive material K.

【0012】コアドリル4は、後端部に装置本体部6へ
の取付部14aを有する筒状コア14と、この筒状コア
14の先端14cに周方向に略等間隔に固着されたブロ
ック状の切削チップ16と、周方向における各切削チッ
プ16間の空隙部を埋める軟質部材18とから構成され
ている。軟質部材18の存在にによってチップ部位は断
面が略矩形のほぼ完全なリング状をなす。
The core drill 4 has a cylindrical core 14 having a mounting portion 14a at the rear end thereof for attaching to the apparatus body 6, and a block-shaped core 14 fixed to the tip 14c of the cylindrical core 14 at substantially equal intervals in the circumferential direction. The cutting tip 16 and the soft member 18 that fills the voids between the cutting tips 16 in the circumferential direction. Due to the presence of the soft member 18, the tip portion has a substantially rectangular cross-section and a substantially perfect ring shape.

【0013】切削チップ16は、ダイヤモンド粒をメタ
ルボンド等のバインダ材で保持したものである。これに
対して軟質部材18は、例えば切削チップ16のメタル
ボンドと同等(例えばダイヤモンド粒を含まず、メタル
ボンドの硬度が同一)か軟質のメタルボンドで形成さ
れ、各切削チップ16間における筒状コア14の先端1
4cと切削チップ16の側面にろう付け等の手段をもっ
て固着される。
The cutting tip 16 holds diamond grains with a binder material such as a metal bond. On the other hand, the soft member 18 is formed of, for example, a metal bond that is equivalent to the metal bond of the cutting tips 16 (for example, does not include diamond grains and has the same hardness of metal bonds) or a soft metal bond, and has a tubular shape between the cutting tips 16. Tip 1 of core 14
4c and the side surface of the cutting tip 16 are fixed by means such as brazing.

【0014】また、この例では筒状コア14の内周面1
4bには、研削材Kを切削部位へ強制誘導するための供
給溝20が筒状コア14の基部から先端に亘って螺旋状
に形成されている。供給溝20は、コアドリル4の回転
方向に対して逆ねじ態様で形成されるもので、この例で
は、コアドリル4の右回転に対して左ねじ態様で形成さ
れている。なお、本出願人は実願平3ー81309号に
て、特に横切り切削の場合に効力を発揮する螺旋供給溝
による研削材Kの強制誘導技術を提案済みである。
Also, in this example, the inner peripheral surface 1 of the cylindrical core 14 is
4b, a supply groove 20 for forcibly guiding the abrasive K to the cutting portion is formed in a spiral shape from the base of the cylindrical core 14 to the tip. The supply groove 20 is formed in a reverse thread form with respect to the rotation direction of the core drill 4, and in this example, is formed in a left thread form with respect to the right rotation of the core drill 4. The applicant of the present application has proposed in Japanese Patent Application No. 3-811309 a technique for forcibly guiding the abrasive material K by means of a spiral feed groove, which is particularly effective in transverse cutting.

【0015】装置本体部6の中央部には、電動モータ等
の駆動源に接続される駆動軸22が設けられており、そ
の先端に筒状コア14の取付部14aが螺合されてい
る。符号24はシール部材を示す。
A drive shaft 22 connected to a drive source such as an electric motor is provided at the center of the apparatus main body 6, and a mounting portion 14a of the tubular core 14 is screwed to the tip thereof. Reference numeral 24 indicates a seal member.

【0016】集塵手段8は、コアドリル4に嵌合されて
切削部位を取り囲む吸引ヘッド26と、この吸引ヘッド
26と図示しない集塵機とを接続する集塵ホース28と
から構成されている。給気管10は装置本体部6の駆動
軸22にいわゆるスイベルジョイント態様で接続されて
おり、駆動軸22には、給気管10に連通する径方向の
水平供給路22aと、この水平供給路22aに連通して
筒状コア14内に臨む軸方向の垂直路22bが形成され
ている。
The dust collecting means 8 comprises a suction head 26 which is fitted to the core drill 4 and surrounds the cutting portion, and a dust collecting hose 28 which connects the suction head 26 and a dust collector (not shown). The air supply pipe 10 is connected to a drive shaft 22 of the apparatus body 6 in a so-called swivel joint manner. The drive shaft 22 has a radial horizontal supply passage 22a communicating with the air supply pipe 10 and a horizontal supply passage 22a. An axial vertical path 22b that communicates with and faces the inside of the tubular core 14 is formed.

【0017】研削材供給手段12は、研削材Kが収容さ
れる研削材タンク30と、給気管10と研削材タンク3
0とを接続する研削材供給路32と、この研削材供給路
32に設けられる開閉バルブ34とから構成されてい
る。
The abrasive material supply means 12 includes an abrasive material tank 30 in which the abrasive material K is stored, an air supply pipe 10 and an abrasive material tank 3.
It is composed of an abrasive material supply passage 32 connecting 0 with an opening / closing valve 34 provided in the abrasive material supply passage 32.

【0018】次にドリル装置2による穿孔過程を説明す
る。コアドリル4を回転駆動しながら移動させると切削
チップ16がコンクリート等の被削材36に食い付いて
穿孔が進行する。穿孔に伴って、給気管10を介して供
給される圧搾空気Aが駆動軸22内を通ってコアドリル
4内に送り込まれ、また、研削材供給手段12の開閉バ
ルブ34が開かれ、これによって研削材Kが研削材供給
路32から給気管10内に送り込まれる。給気管10内
に供給された研削材Kは圧搾空気Aの流れで搬送され、
コアドリル4内に送り込まれる。
Next, the drilling process by the drill device 2 will be described. When the core drill 4 is moved while being rotationally driven, the cutting tip 16 bites against the work material 36 such as concrete and the drilling proceeds. Along with the perforation, the compressed air A supplied through the air supply pipe 10 is sent into the core drill 4 through the drive shaft 22, and the opening / closing valve 34 of the abrasive material supplying means 12 is opened, whereby grinding is performed. The material K is fed into the air supply pipe 10 from the abrasive supply path 32. The abrasive material K supplied into the air supply pipe 10 is conveyed by the flow of the compressed air A,
It is fed into the core drill 4.

【0019】送り込まれた研削材Kは供給溝20に集結
し、コアドリル4の回転に伴う螺旋形のねじ送り作用に
よって先端側へ強制誘導され、切削部位Pへ供給され
る。
The fed abrasive material K is gathered in the supply groove 20 and is forcibly guided to the tip side by the spiral screw feeding action accompanying the rotation of the core drill 4, and is supplied to the cutting portion P.

【0020】切削部位Pでは、軟質部材18が切削チッ
プ16より早く摩耗するので、被削面Sと軟質部材18
との間に常に若干の隙間gが生じ、この隙間gが圧搾空
気Aによる搬送流の通路としてなる。従って、研削材K
も矢印E3 に示すように隙間g、すなわち、切削チップ
16の先端面16aの通過域を確実に案内されることに
なり、これによって研削材Kのほぼ全量が切削チップ1
6の目立てに作用し得る域に供給されることになる。
At the cutting site P, the soft member 18 wears faster than the cutting tip 16.
A small gap g is always formed between the compressed air A and the compressed air A, and this gap g serves as a passage for the flow of the compressed air A. Therefore, the abrasive material K
Also, as indicated by arrow E 3 , the gap g, that is, the passage area of the tip surface 16a of the cutting tip 16 is surely guided, whereby almost the entire amount of the abrasive material K is cut.
6 will be supplied to the area where it can act.

【0021】これによって切削チップ16のバインダ材
が研削材Kとの接触で摩耗してドレッシング作用が促さ
れ、切削チップ16の切れ味が穿孔作業中全体に亘って
低下することなく維持される。研削材Kの供給効率の向
上によって、切削効率の向上が得られるばかりでなく、
研削材Kの適正量による使用効率の向上を図ることがで
きる。
As a result, the binder material of the cutting tip 16 is worn by the contact with the abrasive material K to promote the dressing action, and the sharpness of the cutting tip 16 is maintained throughout the drilling work without lowering. Not only can the cutting efficiency be improved by improving the supply efficiency of the abrasive material K, but
It is possible to improve the use efficiency by using an appropriate amount of the abrasive material K.

【0022】軟質部材18の適正な摩耗による隙間gの
存在によって圧搾空気Aによる冷却機能も有効に維持さ
れ、切削効率の向上並びに作業能率の向上がなされる。
また、この場合、研削材Kは切削チップ16の目立てに
寄与するばかりでなく、ダイヤモンド粒と同様に切刃と
しての機能を呈するものである。なお、研削材Kも使用
後は圧搾空気Aや切削屑Dとともに集塵機に吸引され
る。
Due to the presence of the gap g due to proper wear of the soft member 18, the cooling function by the compressed air A is effectively maintained, and the cutting efficiency and the work efficiency are improved.
Further, in this case, the abrasive K not only contributes to the sharpening of the cutting tip 16 but also functions as a cutting edge like the diamond grains. The abrasive K is also sucked into the dust collector together with the compressed air A and the cutting dust D after use.

【0023】研削材Kは供給溝20によって強制的に誘
導されるので、重力の影響を受ける横切り切削において
も切削部位Pに確実に供給され、上述のごとく供給され
た殆どが所期の目的である切削チップ16の目立てに寄
与することになる。
Since the abrasive material K is forcibly guided by the supply groove 20, the abrasive material K is reliably supplied to the cutting site P even in transverse cutting which is affected by gravity, and most of the supplied material is for the intended purpose. This will contribute to the sharpening of a certain cutting tip 16.

【0024】次に表1は軟質部材18を有するものと従
来品との切削能力の比較実験データを示すものである。
ここで、穿孔試験用検体としては、図5に示すように、
一辺が200mmの正方形断面で長さが1000mmの
コンクリート体C内に3分鉄筋Rを3本内包(深さH1
とH2 )するものを使用した。穿孔方向は矢印Wの方向
である。また、ドリルはコアビット径が4インチのもの
を使用した。
Next, Table 1 shows comparative experimental data of cutting ability between the one having the soft member 18 and the conventional product.
Here, as the sample for the perforation test, as shown in FIG.
Inside a concrete body C having a square cross section with a side of 200 mm and a length of 1000 mm, three third reinforcing bars R are included (depth H 1
And H 2 ). The piercing direction is the direction of arrow W. The drill used had a core bit diameter of 4 inches.

【表1】 [Table 1]

【0025】表1から明らかなように、目立て作用に寄
与し得る域への研削材Kの供給効率を上げることによっ
て、切削能力を格段に向上させることができる。
As is clear from Table 1, the cutting ability can be remarkably improved by increasing the supply efficiency of the abrasive K to the region that can contribute to the dressing action.

【0026】なお、上記例ではドリルが略水平となる横
切りについて示したが、縦切り切削においても上記と同
様の切削機能が得られるものである。
In the above example, the horizontal cutting of the drill is shown, but the same cutting function as above can be obtained in the vertical cutting.

【0027】[0027]

【発明の効果】この発明によれば、研削材のほぼ全量を
切削チップの目立てに作用し得る域に供給することがで
きるので、切削効率の向上を図ることができるととも
に、研削材の使用量の適性化による使用効率の向上を図
ることができる。
According to the present invention, since almost the entire amount of the abrasive can be supplied to the region that can affect the setting of the cutting tip, the cutting efficiency can be improved and the amount of the abrasive used. It is possible to improve the usage efficiency by optimizing.

【図面の簡単な説明】[Brief description of drawings]

【図1】この発明に係るコアドリルの一実施例を示す使
用状態の概要断面図である。
FIG. 1 is a schematic cross-sectional view of a core drill according to an embodiment of the present invention in a use state.

【図2】コアドリルの底面図である。FIG. 2 is a bottom view of the core drill.

【図3】切削部位における要部の拡大斜視図である。FIG. 3 is an enlarged perspective view of a main part in a cut portion.

【図4】従来品で穿孔した場合の切削部位における要部
斜視図である。
FIG. 4 is a perspective view of a main part of a cutting portion when a conventional product is punched.

【図5】穿孔試験検体の斜視図である。FIG. 5 is a perspective view of a punching test specimen.

【符号の説明】[Explanation of symbols]

14 筒状コア 14b 内周面 16 切削チップ 18 軟質部材 14 Cylindrical core 14b Inner peripheral surface 16 Cutting tip 18 Soft member

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 筒状コアの先端にダイヤモンド粒をバイ
ンダ材で保持した切削チップが周方向に間隔をおいて複
数固着されているコアドリルにおいて、 周方向における各切削チップ間の空隙部が切削チップと
同等か軟質の軟質部材で埋められていることを特徴とす
るコアドリル。
1. A core drill in which a plurality of cutting tips, each of which has diamond grains held by a binder material, are fixed to the tip of a cylindrical core at intervals in the circumferential direction, and a gap between the cutting tips in the circumferential direction is a cutting tip. A core drill characterized by being filled with a soft member that is equivalent to or softer than.
JP3333584A 1991-12-17 1991-12-17 Core drill Expired - Lifetime JP2549787B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3333584A JP2549787B2 (en) 1991-12-17 1991-12-17 Core drill

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3333584A JP2549787B2 (en) 1991-12-17 1991-12-17 Core drill

Publications (2)

Publication Number Publication Date
JPH05169307A true JPH05169307A (en) 1993-07-09
JP2549787B2 JP2549787B2 (en) 1996-10-30

Family

ID=18267681

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3333584A Expired - Lifetime JP2549787B2 (en) 1991-12-17 1991-12-17 Core drill

Country Status (1)

Country Link
JP (1) JP2549787B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3037229A1 (en) * 2014-12-22 2016-06-29 HILTI Aktiengesellschaft Drill ring for a core drill bit
EP3037200A1 (en) * 2014-12-22 2016-06-29 HILTI Aktiengesellschaft Drill ring for a core drill bit and method for producing a drill ring
EP3037201A1 (en) * 2014-12-22 2016-06-29 HILTI Aktiengesellschaft Method for producing a closed drill ring for a core drill bit
US20170355103A1 (en) * 2016-06-10 2017-12-14 C4 Carbides Limited Drill Bit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007096973A1 (en) 2006-02-23 2007-08-30 Mitsubishi Materials Corporation Dresser feeding device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60159199A (en) * 1984-01-27 1985-08-20 Plasma Giken Kogyo Kk Lead dioxide electrode
JPS62131717A (en) * 1985-11-29 1987-06-15 株式会社応用企画 Support beam of free-access floor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60159199A (en) * 1984-01-27 1985-08-20 Plasma Giken Kogyo Kk Lead dioxide electrode
JPS62131717A (en) * 1985-11-29 1987-06-15 株式会社応用企画 Support beam of free-access floor

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3037229A1 (en) * 2014-12-22 2016-06-29 HILTI Aktiengesellschaft Drill ring for a core drill bit
EP3037200A1 (en) * 2014-12-22 2016-06-29 HILTI Aktiengesellschaft Drill ring for a core drill bit and method for producing a drill ring
EP3037201A1 (en) * 2014-12-22 2016-06-29 HILTI Aktiengesellschaft Method for producing a closed drill ring for a core drill bit
WO2016102539A1 (en) * 2014-12-22 2016-06-30 Hilti Aktiengesellschaft Drill ring for a core drill bit and method for producing a drill ring
WO2016102523A1 (en) * 2014-12-22 2016-06-30 Hilti Aktiengesellschaft Method for manufacturing a continuous drill ring for a core drill bit
WO2016102261A1 (en) * 2014-12-22 2016-06-30 Hilti Aktiengesellschaft Drill ring for a core drill bit
RU2667114C1 (en) * 2014-12-22 2018-09-14 Хильти Акциенгезельшафт Method of manufacturing a solid ring drill for a core drill bit
US20170355103A1 (en) * 2016-06-10 2017-12-14 C4 Carbides Limited Drill Bit

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