| 摘要 |
<p>A drill bit with an axially elongated shank is suitable for use in all known conventional hand-held drilling machines. The shank is generally cylindrically shaped with axially extending first slots open at the free rear end face of the shank. Axially extending second slots are superimposed at least in part on the first slots and are spaced from the rear end face. Each second slot forms at least one shoulder face disposed transversely of the shank axis and oriented in the direction facing oppositely to the rear end face. Accordingly, the drill bit, due to its first slots, can be utilized in the chucks presently used in drilling machines and percussion drilling machines. Further, due to the second slots, the drill bit can be clamped for limited axial movement in the chucks of known hammer drills.</p> |
