Roof drill bit with hexagonal body portion

Details Roof drill bit with hexagonal body portion Roof drill bit with hexagonal body portion

E - Fixed Constructions

21

B

255/62, 255/82

E21B 10/36 (2006.01) E21B 10/38 (2006.01) E21B 17/046 (2006.01)

Patent

CA 1120918

ABSTRACT OF THE DISCLOSURE An improved drill bit for the mining field for use as a roof drill, tunnel drill, rock boring and high- way construction, both as a rotary and a rotary percussion drill, which includes a drill head with a diametrical slot positioning a brazed cutting blade, the head having a male drive shank to interfit with a female driver tube and hav- ing a maximum axial passage in the driver shank which opens to large fluid passages leading to chip slash openings in opposed quadrants of the drill bit. The drill head position has a hexagonal base portion above the drive shank with cir- cular guiding portions in opposed quadrants adjacent the chip slash quadrant pockets.

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