JP3485968B2 - Drill bit - Google Patents
Drill bitInfo
- Publication number
- JP3485968B2 JP3485968B2 JP16301294A JP16301294A JP3485968B2 JP 3485968 B2 JP3485968 B2 JP 3485968B2 JP 16301294 A JP16301294 A JP 16301294A JP 16301294 A JP16301294 A JP 16301294A JP 3485968 B2 JP3485968 B2 JP 3485968B2
- Authority
- JP
- Japan
- Prior art keywords
- cutting edge
- bit
- tip
- flank
- drill
- 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.)
- Expired - Lifetime
Links
Landscapes
- Earth Drilling (AREA)
Description
【発明の詳細な説明】Detailed Description of the Invention
【０００１】[0001]
【産業上の利用分野】本発明は、掘削用ビットに関し、
特に、鉄筋が含まれている障害物などの掘削に好適する
ようにしたものである。FIELD OF THE INVENTION The present invention relates to a drill bit,
In particular, it is suitable for excavation of obstacles containing reinforcing bars.
【０００２】[0002]
【従来の技術】従来、この種の掘削用ビットは、例え
ば、実開昭５８−１１５５９２号公報，実開昭６４−１
４２９３号公報などに開示されているように、ケーシン
グビット，オーガービットなどに適用されている。そし
て、ビット本体の先端部に取付けられる掘削用チップ
は、すくい面側をルーフ型としているものが多くなって
いる。2. Description of the Related Art Conventionally, excavating bits of this type have been disclosed, for example, in Japanese Utility Model Publication No. 58-115592 and Japanese Utility Model Publication No. 64-1.
As disclosed in Japanese Patent No. 4293, it is applied to casing bits, auger bits and the like. In many cases, the digging tip attached to the tip of the bit body has a roof type rake face.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、鉄筋を
含む障害物の掘削にあたっては前述したルーフ型の刃先
では、鉄筋が適切に切れず、鉄筋を引張ったり、捩った
りするため掘削が良好に行なえないという問題点があっ
た。また、切れないで残った鉄筋は、短く切断されない
ため、回収も困難となるなどの問題点があった。However, when excavating obstacles including reinforcing bars, the roof-shaped cutting edge described above does not cut the reinforcing bars properly and pulls or twists the reinforcing bars, so excavation can be performed well. There was a problem that it did not exist. Further, since the rebar that remains without being cut is not cut into short pieces, there is a problem in that it is difficult to collect.
【０００４】このようなことから、本発明の掘削ビット
では、鉄筋を含んだ障害物の掘削に好適する刃先が備え
られるようにしたものである。In view of the above, the drill bit of the present invention is provided with a cutting edge suitable for excavating an obstacle containing reinforcing bars.
【０００５】[0005]
【課題を解決するための手段】本発明は、上述の点に鑑
みなされたもので、ビット本体の先端部に備えられる掘
削チップは、すくい面および逃げ面にかけて略突円弧状
を呈する楔切刃が形成されるようにしたものである。そ
して、この楔切刃としては、すくい面側から逃げ面側に
かけて曲率半径が順次変化する突円弧状を呈している場
合、略半円弧状を呈するすくい面側の第１切刃および第
１切刃よりも大きい曲率半径を有する逃げ面側の第２切
刃を連設した場合が含まれる。また、楔切刃の頂角は、
６０°〜９０°に構成されるとよい。DISCLOSURE OF THE INVENTION The present invention has been made in view of the above points, and a drilling tip provided at the tip of a bit main body has a wedge cutting edge which is in the shape of a substantially protruding arc toward the rake face and the flank face. Are formed. When the wedge cutting edge has a protruding arc shape in which the radius of curvature sequentially changes from the rake surface side to the flank surface side, the rake surface side first cutting edge and the first cutting edge having a substantially semi-arc shape are formed. The case where the flank side second cutting edge having a larger radius of curvature than the blade is continuously provided is included. Also, the apex angle of the wedge cutting edge is
It may be configured at 60 ° to 90 °.
【０００６】[0006]
【作用】本発明の掘削ビットは、ビット本体に備えられ
た掘削チップには、すくい面側から逃げ面側にかけて突
円弧状を呈する楔切刃が形成されているため、鉄筋を切
断した良好な掘削が行なえるものである。この場合、楔
切刃は、鉄筋に亀裂を入れ、押付け力で当該亀裂を拡げ
ていくことで鉄筋を切断する。In the excavating bit of the present invention, since the excavating tip provided in the bit body is formed with a wedge cutting edge having a protruding arc shape from the rake face side to the flank face side, it is preferable to cut the rebar. It can be excavated. In this case, the wedge cutting blade cuts the reinforcing bar by cracking the reinforcing bar and expanding the crack by pressing force.
【０００７】[0007]
【実施例】以下、本発明掘削用ビットの一実施例につい
て、図を参照しながら説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the excavating bit of the present invention will be described below with reference to the drawings.
【０００８】図１は、すくい面側から逃げ面側にかけて
の曲率半径Ｒ1〜Ｒ3を順次変化させた場合である。これ
は曲率半径Ｒ1域で鉄筋に侵入し、Ｒ2域で徐々に切削
し、Ｒ3域で切削力を最大にするものである。したがっ
て、この曲率半径の組合せでは、Ｒ1＜Ｒ3＜Ｒ2の関係
になっている。なお、掘削チップ３は、ビット本体２の
チップ座７内でろう付けされる FIG. 1 shows the case where the radii of curvature R1 to R3 from the rake face side to the flank face side are changed sequentially. This is to invade the reinforcing bar in the radius of curvature R1, gradually cut in the region R2, and maximize the cutting force in the region R3. Therefore, in the combination of the radii of curvature, there is a relation of R1 <R3 <R2. In addition, the drilling tip 3 of the bit body 2
Brazed in tip seat 7
【０００９】図２は、すくい面側に略半円弧状の第１切
刃６ａ、逃げ面側に第２切刃６ａを構成した場合であ
る。これは、第１切刃６ａが先行して鉄筋に亀裂を入
れ、第２切刃６ｂが鉄筋に深く食込むとともに押切りす
るよう配慮したものである。FIG. 2 shows a case in which a first semi-circular arc-shaped first cutting edge 6a is provided on the rake face side and a second cutting edge 6a is provided on the flank face side. This is designed so that the first cutting edge 6a precedes a crack in the reinforcing bar and the second cutting edge 6b deeply digs into the reinforcing bar and pushes it.
【００１０】なお、本発明の掘削ビット１は、ケーシン
グビットに適用された場合、ケーシングパイプにすべて
組込んでもよいが、鉄筋の含み具合等によって通常のケ
ーシングビットと一緒に組込んでもよい。この場合、本
発明の掘削ビット１を軸方向に幾分突出させることによ
り、鉄筋切削を先行させることが好ましい。When the excavating bit 1 of the present invention is applied to a casing bit, it may be entirely incorporated in a casing pipe, or may be incorporated together with a normal casing bit depending on the inclusion of reinforcing bars. In this case, it is preferable that the rebar cutting be preceded by projecting the drill bit 1 of the present invention to some extent in the axial direction.
【００１１】また、ビット本体２の先端に備えられる掘
削チップ３の周囲には、適宜の肉盛り硬化材、短冊状の
超硬チップを設けるようにすれば摩耗を防止でき有効で
ある。Further, it is effective to prevent wear by providing an appropriate hardfacing material or a strip-shaped cemented carbide tip around the drilling tip 3 provided at the tip of the bit body 2.
【００１２】[0012]
【発明の効果】本発明は、以上説明したように、ビット
本体２に備えられた掘削チップ３には、すくい面側から
逃げ面側にかけて突円弧状を呈する楔切刃６が構成され
るようにしたものである。したがって、前記楔切刃６
は、鉄筋を含んだ障害物であっても、鉄筋に対して、亀
裂および押付け力による切断が行なわれ、有効な掘削が
行なえるという利点を有する。As described above, according to the present invention, the excavating tip 3 provided in the bit body 2 is provided with the wedge cutting edge 6 having a protruding arc shape from the rake face side to the flank face side. It is the one. Therefore, the wedge cutting edge 6
Has an advantage that even if the obstacle includes a reinforcing bar, the reinforcing bar is cut by the crack and the pressing force, and effective excavation can be performed.
【図１】本発明掘削ビットの一実施例を示す一部正面
図、FIG. 1 is a partial front view showing an embodiment of a drill bit according to the present invention,
【図２】他の変形例を示す一部正面図 FIG. 2 is a partial front view showing another modification.
１ 掘削用ビット ２ ビット本体 ３ 掘削チップ ６ 楔切刃 1 excavating bit 2-bit body 3 drilling chips 6 wedge cutting edge
フロントページの続き (72)発明者 谷本 洋司 山口県岩国市楠町２丁目８番４号 有限 会社タニシゲ基礎内 (56)参考文献 実開 平３−2091（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) E21B 10/46 Front Page Continuation (72) Inventor Yoji Tanimoto 2-8-4 Kusu-cho, Iwakuni-shi, Yamaguchi Tanishige Foundation Co., Ltd. (56) References: Kaihei 3-2091 (JP, U) (Int.Cl. 7 , DB name) E21B 10/46
Claims (2)
備えられている掘削用ビットにおいて、前記掘削用チッ
プは、すくい面および逃げ面にかけて突円弧状を呈する
楔切刃が形成され、かつ、該楔切刃は、すくい面側から
逃げ面側にかけて曲率半径が順次変化する突円弧状を呈
していることを特徴とする掘削用ビット。1. A drill bit having a drill tip at the tip of a bit body, wherein the drill tip is formed with a wedge cutting edge having a protruding arc shape extending from a rake face to a flank face, and , The wedge cutting edge is from the rake side
Presents a projecting arc shape whose radius of curvature changes gradually toward the flank side
A bit for excavation characterized by having .
備えられている掘削用ビットにおいて、前記掘削用チッ
プは、すくい面および逃げ面にかけて突円弧状を呈する
楔切刃が形成され、かつ、該楔切刃は、略半円弧状を呈
するすくい面側の第１切刃および第１切刃よりも曲率半
径が大きい逃げ面側の第２切刃が連接されていることを
特徴とする掘削用ビット。2. A drill bit having a drill tip at the tip of a bit body, wherein the drill tip is formed with a wedge cutting edge having a protruding arc shape extending from a rake face to a flank face, and , The wedge cutting edge has a substantially semi-circular shape.
1st cutting edge on the rake face side and half curvature than the 1st cutting edge
An excavating bit characterized in that a second cutting edge on the flank side having a large diameter is connected .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16301294A JP3485968B2 (en) | 1994-06-22 | 1994-06-22 | Drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16301294A JP3485968B2 (en) | 1994-06-22 | 1994-06-22 | Drill bit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0813973A JPH0813973A (en) | 1996-01-16 |
| JP3485968B2 true JP3485968B2 (en) | 2004-01-13 |
Family
ID=15765523
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16301294A Expired - Lifetime JP3485968B2 (en) | 1994-06-22 | 1994-06-22 | Drill bit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3485968B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007224549A (en) * | 2006-02-22 | 2007-09-06 | Tungaloy Corp | Bit |
-
1994
- 1994-06-22 JP JP16301294A patent/JP3485968B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0813973A (en) | 1996-01-16 |
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