Back to results
US 11,691,204 B2Granted
Drill for chiseling stone
AssigneeHilti Aktlengesellschaft
InventorsKlaus-Peter Bohn, Roland Foser, Markus Hartmann, Bastian Pluemacher
Life of this patent
Estimating the term…
Abstract
A drill bit for chiseling stone includes an impact face at an insertion end of the drill bit, a hollow shank, where a delivery passage is defined within the hollow shank, and a drill head, where the drill head has, at a front end of the drill head, a cutting edge, an intake opening, and an intake passage. The intake passage connects the intake opening to the delivery passage. A cross section of the intake passage increases from the intake opening to the delivery passage.
Claims5
A drill bit for chiseling stone, comprising:
- an impact face at an insertion end of the drill bit;
- a hollow shank, wherein a delivery passage is defined within the hollow shank;
- and
- a drill head, wherein the drill head has, at a front end of the drill head, a cutting edge, an intake opening, and an intake passage and wherein the intake passage connects the intake opening to the delivery passage;
- wherein a cross section of the intake passage increases from the intake opening to the delivery passage;
- wherein the cross section of the intake passage increases in a direction of the delivery passage within an upper portion of the intake passage that is disposed at a level of the cutting edge, wherein the upper portion is substantially parallel to a drill bit axis, wherein a lower portion of the intake passage increasingly approaches the drill bit axis in a direction of the hollow shank and runs into the hollow shank with an inclination of between 10 degrees and 30 degrees with respect to the drill bit axis and is continuously curved, and wherein a portion of the intake passage that connects the upper portion to the lower portion is curved.
3 more elements
Dependencies are inferred from the claim text.