| 发明名称 |
Retainer system for roof-mine tool bit |
| 摘要 |
A retainer system for detachably coupling a drill bit to a drill steel member when the drill bit is provided with key-way recess portions adapted to telescopingly and/or rotatably receive an interlocking relationship therein correspondingly shaped key-way members carried by the drill steel member.
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| 申请公布号 |
US4474488(A) |
申请公布日期 |
1984.10.02 |
| 申请号 |
US19830494080 |
申请日期 |
1983.05.12 |
| 申请人 |
MINING TOOLS DIV. OF SMITH INTERNATIONAL, INC. |
发明人 |
PINKERTON, CLETIS P.;MORRIS, ROBERT L. |
| 分类号 |
E21B17/046;F16D1/02;(IPC1-7):F16D1/00 |
主分类号 |
E21B17/046 |
| 代理机构 |
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代理人 |
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| 主权项 |
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| 地址 |
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