초록 ▼

A compact, easily disassembled, minimum headroom drilling unit is disclosed. The drill, especially useful for newly developed vertical retreat mining methods, drills at compound angles from the vertical and horizontal directions. Low headroom is achieved by the employment of a double acting hydrauli

A compact, easily disassembled, minimum headroom drilling unit is disclosed. The drill, especially useful for newly developed vertical retreat mining methods, drills at compound angles from the vertical and horizontal directions. Low headroom is achieved by the employment of a double acting hydraulic cylinder.

대표청구항 ▼

A mobile drilling apparatus, the apparatus comprising a frame, the frame having a distal end and a proximal end, a column pivotally mounted on the distal end of the frame, the column movable in a first arc substantially normal to the distal end of the frame, the first arc defined from a proximal low

A mobile drilling apparatus, the apparatus comprising a frame, the frame having a distal end and a proximal end, a column pivotally mounted on the distal end of the frame, the column movable in a first arc substantially normal to the distal end of the frame, the first arc defined from a proximal lowered position to a distal upright vertical position, anchoring means disposed within the top of the column, a pivot assembly affixed on the distal end of the frame, a box frame mast supported by the column and affixed to the pivot assembly, the mast movable along the first arc in a fixed relationship with the column and along a second arc substantially normal to the first arc independently of the column, a concentric double acting cylinder mounted within the mast, a carrier slidably registered with the mast and ganged with the cylinder so as to move therewith, a stress relief trunnion engaging the cylinder, the stress relief trunnion mounted within a bracket disposed within the mast, the bracket affixed to the carrier, a drill motor affixed to the carrier, and means for securing the apparatus against movement.