发明名称 |
Impact device for directional boring |
摘要 |
An impact boring tool according to the invention suitable for using with a directional boring machine has a tubular housing and a head mounted at a front end of the housing. The head preferably includes a chisel configured for breaking loose rocks and stones encountered in soil. A striker is disposed within the housing for delivering an impact force to the head, either directly or through one or more intervening parts. A trigger mechanism causes the striker to deliver an impact to the head and chisel only when an external force exerted on the impact tool in its lengthwise direction exceeds a predetermined level. This predetermined level generally coincides with a maximum effective amount of pushing or pulling force for moving the tool through the ground exerted by an external device such as a directional boring machine.
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申请公布号 |
US6283229(B1) |
申请公布日期 |
2001.09.04 |
申请号 |
US19980024834 |
申请日期 |
1998.02.17 |
申请人 |
EARTH TOOL COMPANY, L.L.C. |
发明人 |
WENTWORTH STEVEN W.;CRANE ROBERT F. |
分类号 |
E21B4/06;E21B7/20;E21B7/30;(IPC1-7):E21B4/06 |
主分类号 |
E21B4/06 |
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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