| 摘要 |
A drill rig includes a carrier such as a flatbed truck and a drilling un it carried by the carrier. The drilling unit includes a support frame, a mast a nd feed frame pivotally mounted on the support frame and movable between a lowered position for road travel and an operative position, and a safety interlock for disabling the engine of the carrier after the mast and/or feed frame have been moved to the operative position until the mast and/or feed frame returned to the fully lowered position.
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