JPH0318901U - - Google Patents

Info

Publication number
JPH0318901U
JPH0318901U JP7749289U JP7749289U JPH0318901U JP H0318901 U JPH0318901 U JP H0318901U JP 7749289 U JP7749289 U JP 7749289U JP 7749289 U JP7749289 U JP 7749289U JP H0318901 U JPH0318901 U JP H0318901U
Authority
JP
Japan
Prior art keywords
plug
conical surface
core
center line
convex conical
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.)
Pending
Application number
JP7749289U
Other languages
English (en)
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 JP7749289U priority Critical patent/JPH0318901U/ja
Publication of JPH0318901U publication Critical patent/JPH0318901U/ja
Pending legal-status Critical Current

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Landscapes

  • Earth Drilling (AREA)

Description

【図面の簡単な説明】
第1図は本考案による芯金とプラグとの結合構
造の一実施例を示す側面図であり、中央部を断面
で示してある。第2図は第1図と同様の図である
が、従来の芯金とプラグとの結合構造を示してい
る。 11……芯金、12……芯金の先端部、14…
…プラグ、16……凸状円錐面、17……凹状円
錐面、A……芯金の中心軸、B……プラグの中心
軸。

Claims (1)

    【実用新案登録請求の範囲】
  1. 継目無鋼管製造用穿孔機の芯金とプラグとの結
    合構造であつて、前記芯金の先端部は、該芯金の
    中心軸と一致する中心線をもつた凸状円錐面を有
    しており、前記プラグは、該プラグの中心軸と一
    致する中心線をもち且つ前記凸状円錐面と補完的
    形状をなす凹状円錐面を有しており、前記芯金と
    前記プラグとは、それぞれの凸状円錐面と凹状円
    錐面とを互いに当接させることにより結合される
    ことを特徴とする芯金とプラグとの結合構造。
JP7749289U 1989-06-30 1989-06-30 Pending JPH0318901U (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7749289U JPH0318901U (ja) 1989-06-30 1989-06-30

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7749289U JPH0318901U (ja) 1989-06-30 1989-06-30

Publications (1)

Publication Number Publication Date
JPH0318901U true JPH0318901U (ja) 1991-02-25

Family

ID=31619929

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7749289U Pending JPH0318901U (ja) 1989-06-30 1989-06-30

Country Status (1)

Country Link
JP (1) JPH0318901U (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11331703B2 (en) 2015-09-25 2022-05-17 Nippon Steel Corporation Piercer plug and method of manufacturing the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11331703B2 (en) 2015-09-25 2022-05-17 Nippon Steel Corporation Piercer plug and method of manufacturing the same

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