| 摘要 |
The present invention relates in general to subsurface drilling tools, and more specifically, to a drill bit comprising a ball shaped cutting tool (20). The drill bit is configured so that a plurality of cones (22), forming the ball shaped cutting tool, rotate in opposite directions around an axle (24) while the drill bit is drilling or cutting through the ground, rock, or other material. The drilling or cutting is accomplished by a plurality of blade inserts (30) that fit inside and protrude therefrom a plurality of holes (28) covering the exterior of the ball shaped cutting tool. The purpose of the present invention is to provide a new and improved subsurface drilling tool that will efficiently drill hard rock formations. |
