| 摘要 |
An improved boom for a drill rig is described which includes two rotatably mounted clamps which are rotatable between a side loading position, to facilitate loading and unloading in the horizontal position, and a central position, in which a clamped tubular is aligned with the drilling axis when the boom is in the vertical position. An automatic hydraulic sequencing circuit is provided to automatically rotate the clamps into the side loading position whenever the boom is pivoted with a down-hole tubular positioned in the clamp. In this position, the clamped tubular is aligned with a safety plate mounted on the boom to prevent a clamped tubular from slipping from the clamps. A safety frame is formed between the tower of the drill rig and the vertical boom by a slidable bolt mounted on the tower and an annular receiving member mounted on the boom to receive the end of the bolt. This boom also includes an improved pivoting linkage which facilitates the transport of the rig.
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