Patent ID: 6910838

Claim:
A rock drill having a longitudinal axis, the rock drill comprising: a drill head formed from a one-piece carbide crown, the drill head having main lips having a first outside lip diameter formed by a longitudinal extent of the main lips, and secondary lips having a second outside lip diameter formed by a longitudinal extent of the secondary lips and being set back relative to the first outside lip diameter; and one of a single- and multi-state conveying helix having helically encircling main webs having a first outside web diameter that is equal to or slightly smaller than the first outside lip diameter, and helically encircling secondary webs having a second outside web diameter, the main and secondary webs having conveying edges in disposal flutes for transporting drillings, the conveying helix being connected to the drill head by one of a welded or brazed joint in such a manner that the main webs are connected to the main lips and the secondary webs are connected to the secondary lips.