Patent ID: 6089337
Filing Date: 2000-07-18
Classification: B23B,Y10T

Abstract:
A drilling and/or chiseling tool comprises an axially extending shaft (1) having a first end leading in the drilling direction and an opposite second end, a shank (3) extends axially from the second end of said shaft (1), a drilling head (6) is formed integrally with said shaft (1) and extends axially therewith at the first end of said shaft (1) and has at least one hard metal insert (8) secured therein, said shaft (1) having helical drilled material removal grooves (2) extending between said drilling head (6) and said shank (3), said hard metal insert (8) secured in a recess (7) in a surface of said drilling head facing in the drilling direction, said hard metal insert has at least three generally radially extending cutting edges (9) with said cutting edges spaced angularly apart and at least three said removal grooves formed in said shaft (1), said removal grooves have the same uniform pitch angle and a same uniform axial spacing between the shank (3) and the drilling head (6) with the removal grooves forming a running out region extending through the drilling head to the first end of said shaft, and said cutting edges (9) each located between a pair of adjacent running out regions of said removal grooves located in said drilling head (6).