Patent ID: 6712163
Filing Date: 2004-03-30
Classification: B23B,E21B

Abstract:
A rock drilling tool, comprising a stem (2) having a washing fluid bore (7) extending at least along a portion of a longitudinal extend of the stem (2); a tip (3) formed of a hard material and provided at one end of the stem (2); and a shank (4) provided at an opposite end of the stem (2) and having a plurality of entrain grooves (5) extending up to a free end surface of the shank (4), an entire cross-sectional recessed surface (11) of each entrain groove (5) being larger than an entire cross-sectional outer surface (10) of each of groove-forming rest webs (6), and a mean rest cross-sectional area (Aâ€²), which is measured within an axial section of the drilling tool having a length at least equal to a product of a natural logarithm base and a stem diameter (eÃ—D), deviating from a mean rest cross-sectional area (A) along the entire length of the drilling tool (1) maximum by 20%.