| 发明名称 |
SCHRAUBBARES DISTANZSTÜCK |
| 摘要 |
An improved thin walled threaded spacer for use in preventing thread galling in adjacent sections of drill pipe in a drill string is formed by mechanically deforming a strip of copper/beryllium alloy containing 2% beryllium to form a preform having a hollow, truncated conical section and then mechanically deforming the conical section to impart helical grooves therein. |
| 申请公布号 |
DE60125730(D1) |
申请公布日期 |
2007.02.15 |
| 申请号 |
DE2001625730 |
申请日期 |
2001.03.07 |
| 申请人 |
BRUSH WELLMAN INC. |
发明人 |
FREEMAN, STEPHEN;KRUS, DAVID;MORACZ, DONALD;NIELSEN, D.;RYAN, DIANE |
| 分类号 |
E21B17/042;E21B17/043;B21D51/10;E21B17/04;E21B17/046;F16B37/02;F16B37/12;F16L15/08 |
主分类号 |
E21B17/042 |
| 代理机构 |
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