JPS61206790U - - Google Patents

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Publication number
JPS61206790U
JPS61206790U JP9140785U JP9140785U JPS61206790U JP S61206790 U JPS61206790 U JP S61206790U JP 9140785 U JP9140785 U JP 9140785U JP 9140785 U JP9140785 U JP 9140785U JP S61206790 U JPS61206790 U JP S61206790U
Authority
JP
Japan
Prior art keywords
cutting
bit
core
recess
end surface
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
JP9140785U
Other languages
English (en)
Other versions
JPH0141834Y2 (ja
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 filed Critical
Priority to JP9140785U priority Critical patent/JPH0141834Y2/ja
Publication of JPS61206790U publication Critical patent/JPS61206790U/ja
Application granted granted Critical
Publication of JPH0141834Y2 publication Critical patent/JPH0141834Y2/ja
Expired legal-status Critical Current

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  • Earth Drilling (AREA)

Description

【図面の簡単な説明】
第1図は本考案にかかる穿孔ビツトの1例をあ
らわす平面図a、正面図b、右側面図c、第2図
は異なる実施例をあらわす平面図a、正面図b、
右側面図c、第3図a,bはその超硬チツプの正
面図および側面図、第4図と第5図は要部の説明
図である。 1……胴部、2……レンチフラツト、3……刃
体、4……凹部、6……切欠き部、8,10……
切削アーム、C……コア切削用切刃。

Claims (1)

    【実用新案登録請求の範囲】
  1. 超硬刃体が植設された複数の切削アームを先端
    部にそなえ、回転と推力とによつてコンクリート
    等の被掘削物に穿孔する穿孔ビツトであつて、前
    記複数の切削アームに挾まれたビツトの中心部に
    は切削時に円柱状のコアが形成される凹部が設け
    られ、この凹部に臨む刃体の端面部には、複数の
    刃体の内接円と該端面部との接点付近に前記コア
    の外周を削るコア切削用切刃が形成されているこ
    とを特徴とする穿孔ビツト。
JP9140785U 1985-06-17 1985-06-17 Expired JPH0141834Y2 (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9140785U JPH0141834Y2 (ja) 1985-06-17 1985-06-17

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9140785U JPH0141834Y2 (ja) 1985-06-17 1985-06-17

Publications (2)

Publication Number Publication Date
JPS61206790U true JPS61206790U (ja) 1986-12-27
JPH0141834Y2 JPH0141834Y2 (ja) 1989-12-08

Family

ID=30647266

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9140785U Expired JPH0141834Y2 (ja) 1985-06-17 1985-06-17

Country Status (1)

Country Link
JP (1) JPH0141834Y2 (ja)

Also Published As

Publication number Publication date
JPH0141834Y2 (ja) 1989-12-08

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