发明名称 |
PULLBACK SYSTEM FOR DRILLING TOOL |
摘要 |
A pullback system for a drilling tool includes features to retain a pulling cable. The drilling tool includes a drill bit body for carrying a plurality of cutting teeth. The drill bit body has a first side and an opposite second side. The drill bit body also defines a first pullback device passage that extends through the drill bit body from the first side to the second side. The first pullback device passage extends generally along a passage axis that extends through the drill bit body. The first pullback device passage includes at least a portion adjacent to the first side that curves as the surface extends in a direction along the passage axis. The passage axis is positioned along a reference plane that generally bisects the drill bit body. |
申请公布号 |
EP3130744(A1) |
申请公布日期 |
2017.02.15 |
申请号 |
EP20160182804 |
申请日期 |
2016.08.04 |
申请人 |
Vermeer Manufacturing Company |
发明人 |
HOELTING, Keith Allen;KREIMEYER, Andrew James |
分类号 |
E21B7/04;E21B7/06;E21B7/20 |
主分类号 |
E21B7/04 |
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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