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Apparatus intended to be mounted on a derrick in order to introduce or remove the sections of the rod of one or more support grids
Apparatus intended to be mounted on a derrick in order to introduce or remove the sections of the rod of one or more support grids
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机译：打算安装在井架上的设备，用于引入或取下一个或多个支撑格栅的杆的部分
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摘要
Derrick mounted apparatus for the manipulation of lengths of pipe in or out of one or more finger boards in proximity thereto comprising a pipe manipulating arm adapted to move along a single predetermined line and a pipe gripping hand rotatably attached to one end of the pipe manipulating arm, the pipe gripping hand being capable of accepting and discharging pipe in an angular direction with respect to the line of movement of the arm.
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