发明名称 |
DERRICK TILTING SYSTEM |
摘要 |
A shaft drilling machine generally includes a pivotable power swivel supported on a drilling assembly moved along a mast by hydraulic cylinders. Improved means for positioning the mast include a screw jack assembly with one end adapted to be secured to the power swivel and the other end secured to the base of the machine. |
申请公布号 |
AU1199376(A) |
申请公布日期 |
1977.09.22 |
申请号 |
AU19760011993 |
申请日期 |
1976.03.15 |
申请人 |
HUGHES TOOL CO. |
发明人 |
JOSEPH LEONARD KELLY, JR. |
分类号 |
E21B3/00;E21B7/02;E21B15/04 |
主分类号 |
E21B3/00 |
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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