| Patent Number |
Title Of Patent |
Date Issued |
| 5465798 |
Drill automation control system |
November 14, 1995 |
| A rotary blasthole drilling apparatus comprises a rotary blasthole drill and a drill automation control system. The apparatus includes a pull-down motor and a drill motor. The pull-down motor is driven by a pump to provide a pull-down force to a drill string, and the drill motor is used |
| 5413186 |
Reverse percussion device |
May 9, 1995 |
| A reverse percussion device for use with hydraulic percussive drills is provided. The reverse percussion device includes a cycling piston, valve and anvil. The piston and valve move in opposing directions between low and high pressure passages automatically until a lodged drill bit is |
| 5398772 |
Impact hammer |
March 21, 1995 |
| In an impact drilling apparatus, an impact hammer is provided that includes a body portion and a piston head on the body portion. The piston head has a larger outer periphery than the body portion. The body portion and the piston head have substantially the same cross-sectional area at a |
| 5358058 |
Drill automation control system |
October 25, 1994 |
| A rotary blasthole drilling apparatus comprises a rotary blasthole drill and a drill automation control system. The apparatus includes a pull-down motor and a drill motor. The pull-down motor is driven by a pump to provide a pull-down force to a drill string, and the drill motor is used |
| 5143163 |
Digging tooth |
September 1, 1992 |
| A replaceable digging tooth for an earth auger including a generally oblong body member and a shank depending from the body member and receivable in a support block of the earth auger. The body member includes an elongated leading surface, an elongated trailing surface and first and seco |
| 5067262 |
Digging tooth |
November 26, 1991 |
| A digging tooth including a body portion and a plurality of hard water resistant conical inserts. The body portion includes a generally planar distal portion, a medial portion, and a bifurcated proximal portion having at least two prongs separated from each other to form a slot. The coni |
| 4278135 |
Variable volume pneumatic drill |
July 14, 1981 |
| A Pneumatic impact drilling tool, particularly useful as a downhole pneumatic drill, includes a housing structure adapted to be connected to a string of drill pipe and supplied with compressed air therethrough. A hammer piston reciprocates in the housing structure along flexible feed |
