Hard material head and rotary percussion drill bit
AssigneeHilti Aktiengesellschaft
InventorOlaf Koch
Life of this patent
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Abstract
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.
Claims17
A hard material head for a rotary percussion drill bit (2,2′) having an elongated shaft (15), the hard material head comprising:
- at least three cuffing edges (4) distributed circumferentially within a circumscribing circle (3);
- a bottom surface (6) located opposite the cutting edges (4) for being fastened by a material bond to an end (8) of the drill bit shaft (15) of the rotary percussion drill bit (2,2′);
- a concave side surface (5) formed circumferentially between adjacent cutting edges (4);
- and
- a peripheral pocket (9,9′) opening toward the bottom surface (6) and formed, respectively, in at least two concave side surfaces (5) located opposite one another, which is limited by a closing surface radially spaced from the respective concave side surface, and in which a corresponding axial pin (10,10′) formed on the shaft end (8) is formlockingly engageable.
Dependencies are inferred from the claim text.