JPH0189818U - - Google Patents

Info

Publication number
JPH0189818U
JPH0189818U JP18534787U JP18534787U JPH0189818U JP H0189818 U JPH0189818 U JP H0189818U JP 18534787 U JP18534787 U JP 18534787U JP 18534787 U JP18534787 U JP 18534787U JP H0189818 U JPH0189818 U JP H0189818U
Authority
JP
Japan
Prior art keywords
drilling
diameter
hole
blade
pilot hole
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
JP18534787U
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 JP18534787U priority Critical patent/JPH0189818U/ja
Publication of JPH0189818U publication Critical patent/JPH0189818U/ja
Pending legal-status Critical Current

Links

Landscapes

  • Punching Or Piercing (AREA)

Description

【図面の簡単な説明】
図面は本考案の実施例を示し、第１図から第６
図は穿孔工程の各状態を示す断面図である。 １……穿孔具、４……第１穿孔刃、５……第２
穿孔刃、６……中空部材、１３……下孔、１６…
…粗孔。

Claims (1)

    【実用新案登録請求の範囲】
  1. 中空部材の対向位置に一連の孔を開設する中空
    部材の穿孔具において、先端に要求穿孔径よりも
    小径な第１穿孔刃を設け、該第１穿孔刃の基端側
    に要求穿孔径の第２穿孔刃を設け、第１穿孔内に
    よつて小径な下孔を穿孔し、該下孔を第２穿孔刃
    により要求穿孔径に拡径すると共に、上記下孔の
    抜きかすによつて下孔の対向位置に粗孔を開設し
    、この粗孔を第２穿孔刃によつて要求穿孔径に仕
    上げることを特徴とする中空部材の穿孔具。
JP18534787U 1987-12-07 1987-12-07 Pending JPH0189818U (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18534787U JPH0189818U (ja) 1987-12-07 1987-12-07

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18534787U JPH0189818U (ja) 1987-12-07 1987-12-07

Publications (1)

Publication Number Publication Date
JPH0189818U true JPH0189818U (ja) 1989-06-13

Family

ID=31476666

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18534787U Pending JPH0189818U (ja) 1987-12-07 1987-12-07

Country Status (1)

Country Link
JP (1) JPH0189818U (ja)

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