Rock drill
AssigneeHilti Aktiengesellschaft
InventorsUdo Hauptmann, Tim Pröls, Thorsten Assel
Life of this patent
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Abstract
A rock drill (1) for cutting rock comprising an elongated, helical shaft (2), which has, at one end, an insertion part (3) and, at the end opposite, a tool head (4) with cutters (5) made of hard material, wherein the helical shaft (2) is at least partially coated with a colored layer (7a, 7b) and the layer forms a lengthwise running wear indicator marking (8) inside the helical groove (8).
Claims3
A rock drill for cutting rock comprising an elongated helical shaft (2) having, at one end, an insertion part (2) and, at an opposite end, a tool head (4) with cutters (5) made of hard material, wherein the helical shaft (2) is at least partially coated with a colored layer (7a, 7b) and wherein the colored layer (7a, 7b) forms a wear indicator marking (9) running along its length inside the helical groove (8);
- wherein a radially smaller auxiliary helix spine (10a, 10b) is coated with the colored layer (7a, 7b) relative to a helix (6).
Dependencies are inferred from the claim text.