Drilling head
OwnerRodney L. Dice, Jimmy E. Hillman +1inventors
InventorsRodney L. Dice, Jimmy E. Hillman, Robert F. Dice
Life of this patent
Estimating the term…
Abstract
A drilling head of the claw-type which eliminates the need for a pilot bit. The configuration to be described hereandafter causes the drill head to run more smoothly and straighter than those claw-type drills having a pilot. The structure includes a threaded stem portion for threadedly affixing the drilling head to a drive source, a platform extending from the stem portion upon which plural drill bits are affixed on a top face thereof in which the platform is formed from three sectors of pyramid shape, and the recess on the top face of the sectors is provided with further bits for cutting outside of the drill head itself.
Claims10
A claw-type drilling head devoid of a central pilot bit comprising, in combination:
- (a) a threaded stem portion for threadedly affixing said head to a drive source,
- (b) a platform extending from said stem portion,
- (c) plural drill bits,
- (d) means for fixedly attaching said drill bits to said platform to rotate only therewith, said platform formed of plural sectors of pyramid shape,
- (e) means for cooling and cleaning said bits while drilling including a centrally disposed axially extending cooling and cleaning means.
Dependencies are inferred from the claim text.