Drill
AssigneeHilti Aktiengesellschaft
InventorsOlaf Koch, Joachim Woerz, Karl-Heinz Hofmann, Werner Britten
Life of this patent
Estimating the term…
Abstract
A drill, which is used in a hammer drill for drilling holes in stone, concrete and the like, includes a drilling head (10, 20, 30) formed of a hard material and provided, at its first end (5) with at least one main bit (3) having a tip (4), and at a second end (6) located opposite the first end (5), with a bottom surface (7) for the mounting the drilling head (10; 20; 30) on the drill stem (8), and having a plurality of axially extending through-grooves (11; 21; 31) for removing drillings produced during a drilling process and having a cross-section which increases, at least regionwise, in a direction toward the bottom surface (7) of the drilling head (10; 20; 30).
Claims5
A drill, comprising a stem (8);
- and a drilling head (10;
- 20;
- 30) formed of a hard material and provided, at a first end (5) thereof with at least one main bit (3) having a tip (4), and at a second end (6) located opposite the first end (5), with a bottom surface (7) for mounting the drilling head (10;
- 20;
- 30) on the stem (8), and having a plurality of axially extending through-grooves (1 1;
- 21;
- 31) for removing drilling produced during a drilling process and having a cross-section which increases, at least regionwise, in a direction toward the bottom surface (7) of the drilling head (10;
- 20;
- 30).
Dependencies are inferred from the claim text.