| 摘要 |
A hard material head ( 1 ) for a rotary percussion drill bit ( 2 ) having an elongated shaft ( 15 ) including at least three cutting edges ( 4 ) distributed circumferentially within a circumscribing circle, a bottom surface ( 6 ) located opposite the cutting edges ( 4 ) and fastened by a material bond to an end ( 8 ) of the drill bit shaft ( 15 ) of the rotary percussion drill bit ( 2 ), concave side surfaces ( 5 ) formed circumferentially between adjacent cutting edges ( 4 ), and a peripheral pocket ( 9 ) opening toward the bottom surface ( 6 ) and formed, respectively, in at least two concave side surfaces ( 5 ) located opposite one another, and in which a corresponding axial pin ( 10, 10' ) formed on a shaft end ( 8 ) is form-locking engageable.
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