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| Number | Title | Issue Date |
| 5931238 | Apparatus for storing and handling drill pipe A blast hole drill with a drill head mounted on a mast has a pipe carousel on the drill deck which holds drill pipe along the length of the deck. A pipe handling arm mechanism has a lower arm portion pivotally mounted on the deck and an upper arm portion ... | 08/03/1999 |
| 5375667 | Stowing and handling system for rods used in drilling rigs A system for stowing and handling rods (50) for use in drilling rigs (110) comprising a drilling tower (122) with a driving head (130) movable between a borehole and a service well (151) for taking up and depositing the drilling rods. The system comprises... | 12/27/1994 |
| 4444536 | High speed well working apparatus Disclosed is a rig for working on wells, and including a pair of continuous chains for moving a pair of pipe holders along a mast. Each of the two pipe holders is fixed to a point in each chain. The chains are driven along parallel paths by twin motors wi... | 04/24/1984 |
| 4109800 | Multi-stage well-drilling mast assembly A multi-stage, well-drilling mast assembly, particularly adapted to mobile drilling platforms, such as drilling vessels, the assembly having a main stage mast and an auxiliary mast, both pivoted to the platform for swinging movements between horizontal an... | 08/29/1978 |
