Patent ID: 7270503

Claim:
A cutting tool for turning and boring into solid material,comprising: a drill shank defining a drill axis and having an end; a cutting head disposed at said end and having a straight, front cutting edge running substantially transversely with respect to said drill axis, said front cutting edge being disposed to cut as far as said drill axis and enclosing therewith an angle α of less than 90°, and an adjacent straight lateral cutting edge for cutting a wall of a bore, said lateral cutting edge enclosing an angle β of more than 90° with a perpendicular to said drill axis and merging into a straight, rear cutting edge running substantially transversely with respect to said drill axis; said lateral cutting edge being formed on a section of said cutting head projecting from said drill shank by a height h having a value between 5% and 40% of a drill diameter d and having a width b having a value between 5% and 40% of the drill diameter d, and a ratio of the height h to the width b lying in a range from substantially 1:0.7 to 1:1.3, and said rear cutting edge enclosing an angle γ of less than 90° with said drill axis.