发明名称 |
POSITIONING DEFLECTION WEDGES |
摘要 |
A deflection wedge is positioned in a long horizontal drill hole by securing it with a shear pin to an extension on a drill string. The extension is turned independently of the drill string to enable a droparm mechanism to actuate a trigger which stops rotation at a predetermined orientation. Rotation is effected by means of a rifle bar mechanism. The rifle bar presses against the bottom of the hole to cause rotation and the trigger declutches the rifle nut when the droparm drops. |
申请公布号 |
ZA7800917(B) |
申请公布日期 |
1979.08.29 |
申请号 |
ZA19780000917 |
申请日期 |
1978.02.16 |
申请人 |
BOART INT LTD |
发明人 |
WILLIAMS D;EILERS W;GRABE J;LADISLAVFIGAR Z;LANDERS S |
分类号 |
E21B7/04;E21B7/06;E21B7/08;E21B21/10;E21B23/04 |
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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