发明名称 |
Drill for boring anchor fixing hole |
摘要 |
A drill for boring an anchor fixing hole 72 having an expanded configuration at a nearby area of a bottom part of the hole, wherein a stopper 4 having a diameter larger than an outside diameter of the drill main body 2 is disposed at a location near a shank 3 of the drill main body 2 and a surface 41 of the stopper 4 on a leading end side of the drill is a tapered curved surface which is expanded towards the shank 3 side from the leading end side of the drill. According to the drill of the present invention for boring an anchor fixing hole, an expanded bottom anchor fixing hole can be bored without using two kinds of drills and at a low cost.
|
申请公布号 |
US2004089476(A1) |
申请公布日期 |
2004.05.13 |
申请号 |
US20020291691 |
申请日期 |
2002.11.12 |
申请人 |
UCHINO MUNEHITO;YANAGISAWA TUGIO |
发明人 |
UCHINO MUNEHITO;YANAGISAWA TUGIO |
分类号 |
B23B51/00;B28D1/14;E21B10/26;E21B10/44;E21D20/00;(IPC1-7):E21B10/36 |
主分类号 |
B23B51/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|