| 摘要 |
A solid hard material head for a percussion drilling tool rotatable about a rotational axis (A) in a rotational direction (omega), includes at least one main bit and at least one auxiliary bit ( 5 ), circumferentially offset relative to the at least one main bit ( 3 ) and having an auxiliary cutting edge ( 6 ) formed, at least piecewise, as a circular arc section ( 7 ) spaced from the rotational axis (A) radially inwardly and inclined in a radial direction, and a straight outer section ( 8 ) extending radially outwardly with respect to the circular arc section ( 7 ) and inclined in the radial direction.
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